• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    SEALING GAS MONITORING AND CONTROL SYSTEM. The present invention relates to a monitoring and control system for a sealing gas supply system for a non-contact gas seal. The supply includes various gas conditioning elements or units. The monitoring and control system includes an evanescent wave sensor to sense the presence of liquid in the sealing gas. Multiple sensors for sensing the temperature and pressure of the treated seal gas are arranged at the outlet of the conditioning elements. A programmable logic device is provided with information regarding the phase of the gas at various pressures and temperatures and compares the sensed data to the baseline data. Recognition of liquid concentrate results in an output signal.
    公开号:BR112014002536B1
    申请号:R112014002536-3
    申请日:2012-08-01
    公开日:2021-05-18
    发明作者:Joe Delrahim；Paul A. Hosking
    申请人:John Crane Inc.；
    IPC主号:
    专利说明:

    CROSS REFERENCE TO RELATED ORDER(S)
    [0001] This order claims priority under Title 35 USC §19(e) to US Provisional Order No. 61/514,732 filed August 3, 2011 and entitled "Sealing Gas Monitoring and Control System" , whose complete report and drawings are incorporated herein by reference as if fully described therein. BACKGROUND
    [0002] The present invention relates to gas conditioning systems for non-contact gas seals. More particularly, it relates to a system for monitoring and controlling sealing buffer gas.
    [0003] Non-contact seals for gas compressors and other rotating equipment, such as gas and steam turbines, turbo expanders, centrifugal pumps and the like, operate on a thin film of conditioned process gas; pretreated to make it suitable for release to, and passage through, the sealing mechanism. Commonly, the source of this sealing gas, sometimes called buffer gas, is the machine discharge.
    [0004] The principle of dry gas sealing technology is that the sealing faces are non-contact and a clean dry gas is allowed to pass through the sealing interface. It flows from the high pressure side of the seal to the low pressure seal and is routed to a flame line through the primary vent output module which comprises monitoring instruments and a safety trigger to deactivate the compressor in the event of high sealing leakage. Typically abnormal sealing gas leakage has been the only measure of sealing performance.
    [0005] The seal gas, which is the gas on which the non-contact seal operates, is process gas generally from the compressor unit discharge line, channeled to the control system supply line. The control system then regulates and filters the buffer gas flow before it is injected into the primary seal chamber. Pressure and leak rate are monitored and recorded to ensure seals function properly.
    [0006] A known cause of seal failure is a clean dry seal or buffer gas being supplied to the compressor. Critical to the longevity of the gas seal, the seal gas must be free of vapor or liquid condensate. Liquid contamination is found to be a leading cause of failure. Particular applications prone to liquid contamination have been found in most offshore platforms, hydrogen recycling, gas recovery, ammonia, HP piping and similar sealing applications. Initial gas composition information is often unreliable, and changes with resulting in failures due to liquid condensation.
    [0007] Attention to damage prevention and reliability is particularly critical due to the requirements of high pressure compressors used in exploration, such as gas reinjection and the complexity of the gas compositions involved. Unexpected sealing failures cause operational loss and start-up delay.
    [0008] Also, initial system selection often saps optimal reliability. Compressor manufacturers often do not review the composition of the process fluid, including gas composition, operating pressure and temperature, level of liquid and contaminant in the process gas, and the auxiliary buffer gas requirement. In addition, current systems do not provide early warning or initiate corrective action to prevent exposure to free liquid or condensate, which is considered to be a major cause of failure. The current method of assessing seal health based on leakage volume is insufficient. Failures are costly due to delayed start-up and lost production.
    [0009] As compressor operating requirements push beyond current limits, there is a clear need for innovative and intelligent approaches to support emerging compressor markets.
    [00010] One way to improve the reliability of these new designs is to integrate such seals with imaginative control system technology. Achieving optimal reliability is ensured by providing appropriate control system technology to ensure that clean, dry buffer gas is always available to the non-contacting faces of the seal.
    [00011] Previous efforts to monitor the sealing gas have focused on recognizing conditions within the gas chamber containing the non-contact sealing devices. An example is disclosed in US Patent Application No. 12/469,045 filed May 20, 2009 (Publication US2009/0290971) the full report and drawings of which are incorporated herein by reference as if fully described. DISCLOSURE SUMMARY
    [00012] The system of this disclosure is intended to eliminate liquid condensate from the sealing environment, thereby avoiding the leading cause of sealing failures. A warning or correction can also be provided to ensure that liquid fluid does not reach the seal chambers.
    [00013] In this regard, the system is arranged to detect liquid contaminant in the sealing gas supply conduit before reaching the gas chamber. It comprises a monitoring and control system for a seal gas supply system for a non-contact gas seal that is receptive to liquid, vapor or condensate in the seal gas supply stream. The supply system includes a supply conduit connecting various gas conditioning elements. The monitoring and control system includes an evanescent wave sensor in the duct to sense the presence of liquid in the sealing gas. In addition, multiple sensors for sensing the temperature and pressure of the treated seal gas are arranged along the duct at the outlet of the conditioning elements. A programmable logic device communicates with the sensors and is receptive to the recognition of liquid in the conduit. It is provided with stored information regarding the gas phase at various pressures and temperatures and makes a comparison to the sensed data. Recognition of a liquid phase results in an output signal, or action. DESCRIPTION OF DRAWINGS
    [00014] Figure 1 is a schematic of a typical gas conditioning system for pre-treatment of a non-contact seal plug seal gas supply.
    [00015] Figure 2 is a schematic of the sealing gas monitoring and control system of the present disclosure.
    [00016] Figure 3 is a phase diagram for a typical gas compressor process gas. DETAILED DESCRIPTION
    [00017] Commonly, seal gas conditioning consists of three functions - filtration, pressure or flow regulation, and leakage monitoring.
    [00018] Filtration: In previous designs, filtration consisted of simple duplex filters - an active filter and a standby filter. A simple valve can reposition each filter to facilitate filter element replacement. A supply gas line from the discharge side of the compressor then feeds the hot discharge gas to the filter. The coalescent or particulate type gas filters used in this order are not always effective to completely purge liquid and condensate from the seal gas stream.
    [00019] Pressure or flow regulation: Hot gas from the filter is driven through a pressure regulator or flow control valves to supply clean buffer gas to the sealing environment. Buffer gas pressure is normally lower than discharge pressure, and should be higher than compressor suction pressure. By reducing the pressure of the buffer gas through the regulating valve, the gas expands and cools, and has a tendency to drip liquid, depending on its composition. Subsequently, this pressure reducing device, used to reduce the gas pressure from the discharge side of the unit, can function as a source for injecting saturated buffer gas into the sealing port.
    [00020] Leak Monitoring: The outer and inner seal leakage rates are measured as a way to establish seal condition and performance. Typically, a leak flow rate at or above a fixed primary seal leak rate indicates primary seal malfunction. A primary seal leak flow rate below a set point indicates excessive secondary seal leakage.
    [00021] This basic type of dry gas seal sealing gas conditioning system works well if the process fluid is clean and free of any liquid condensate under all operating conditions. An often overlooked consideration is the composition of the intended process fluid, including gas composition, operating pressure and temperature, level of liquid and contaminants in the process, and auxiliary buffer gas requirement. In addition, a typical gas seal seal gas supply system does not provide early warning or initiate corrective action to prevent exposure of the dry gas seal to free liquid or condensate.
    [00022] Generally, the gas composition supplied to the suction side of the compressor remains unchanged unless there is a disturbance in the larger plant process during operation when plant equipment, such as mops or heaters, malfunctions. The conditions of the buffer gas supplied to the unit discharge dry gas or auxiliary gas system change, however, due to the fluctuating fluid pressure or temperature throughout the gas stream before the buffer gas is injected into the dry gas sealing chamber of each fence. This change can be the result of gas expansion through the regulating valves, restriction through the filter elements or ambient conditions.
    [00023] A conditioning system for gas compressor seals is disclosed in US Patent No. 6,715,985 issued April 6, 2004 entitled "Gas Conditioning System". It is illustrative of a successful arrangement for pre-treatment of seal buffer gas prior to release to the seal chamber for passage through non-contact seals in operation.
    [00024] Referring to Figure 1, a gas conditioning system as described in US Patent 6,715,985 for sealing gas released to a contactless gas seal is illustrated. The generally designated system 10, including the individual components discussed below, can be unitized as a single package on a mobile slide. It can be positioned in association with an existing swivel equipped with one or more gas lubricated non-contact seals, or it can be part of a new equipment installation where non-contact, gas lubricated seals are to be used.
    [00025] Connection of system 10 to equipment where seals are used can take place through appropriate ports on a gas control panel shown schematically. Such control panels are typically located adjacent to rotating equipment that is sealed and contain valves and gauges that reflect the operation of the seal. It is contemplated that the system can be incorporated with a gas panel as a single unitized module.
    [00026] As seen in Figure 1, the system 10 includes a connection or inlet 12 for piping defining a conduit 15 to release the process gas received through the conditioning elements and into the sealing chambers defined by the compressor housing. The inlet is connected to a gas source for supply to the seal chamber or chamber in which a non-contacting, gas-lubricated gas seal is disposed. As is known in the art, this source may typically be the discharge end of a gas compressor where seals are employed.
    [00027] The system 10 includes a connection or outlet 14 for conduit adapted to be placed in communication with a sealing chamber within the device. Such a connection can communicate with one or more seal chambers depending on the number of seals employed in the device.
    [00028] The larger conditioning elements of the system of the present invention are elements to remove solid and liquid particulate matter and aerosols from gas, and heat and amplify the pressure of the gas when necessary. An ejection filter and coalescer vessel 16, a pressure vessel 18, a gas heating element 22 and a pressure amplifier 20 are illustrated. These components are connected in fluid communication by conduit or conduit, generally designated 15, which defines a flow path between the gas supply connection 12 and the connection 14 to the seal chamber.
    [00029] The ejection filter-coalescer vessel 16 is a device that removes particulate matter and liquid droplets from the gas flowing through the system. It includes a baffle plate designed to remove solid particulate and free liquid contained in the sealing gas. This separate contamination sits on the bottom of vessel 16 and is removable, either manually or by an automated arrangement.
    [00030] The sealing gas is then further conditioned by purging it of liquid aerosols trapped by the coalescing action of a filter element. The ejection plate and coalescing filter are known devices. Also, a centrifugal type device can be employed in place of the ejection plate. In such an arrangement, two separate vessels, one for the centrifuge, the other for the filter element, can compose the conditioning element 16.
    [00031] Pressure vessel 18 is a tank capable of keeping the gas under system pressure. Its volume is determined by the expected seal requirements in the seal chamber and labyrinth leakage rate. An appropriate size is calculated for the particular application involved.
    [00032] The heating element 22 is arranged inside the pressure vessel 18.
    [00033] The compression cylinder of the gas pressure amplifier or intensifier or intensifier 20 is in communication with line 15(b) as part of the flow path to pressure vessel 18. The piston in the compression cylinder pressurizes the gas seal in the system for release to the pressure vessel 18.
    [00034] The system described above provides a liquid ejection before filtration, and insulation and heat to prevent the formation of liquid condensate in the buffer gas. While this approach helps to reduce liquid condensate, it may not be effective for emerging applications such as ultra high pressure reinjection compressors, which employ heavy hydrocarbon as part of their gas compositions, and in applications where the only gas source buffer is from the high temperature discharge side of the compressor. In certain applications, for example gas reinjection compressors used in oil recovery, this discharge pressure can be as high as 68947.57 kPa (10,000 pounds per square inch (psi)).
    [00035] The system described above may be suitable for most applications. However, failures can still occur due to a lack of clean, dry buffer gas available. This is a major issue for current dry gas seal control systems and there is no early warning of any changes in conditions that could result in forming or exposing the dry gas seal to liquid.
    [00036] In addition, the gas analysis provided to the manufacturer to determine the suitability of the buffer gas dew point and the need for buffer gas conditioning is based on a limited gas analysis, typically up to Octane (C8) or less . Gas analysis up to C12 may be required for the manufacturer to be able to size the appropriate system to obtain a more suitable buffer gas to avoid liquid drops across the sealing faces.
    [00037] In order to improve the reliability of dry gas sealing even further, a new approach to buffer gas conditioning is disclosed in this document. It is suitable for all applications, but particularly suitable for applications such as wet gas, or any projects where liquid or condensate can form due to changing operating environment. The arrangement of the present disclosure will also recognize the malfunction of a system gas conditioning element and provide an appropriate signal, alert or automatic response.
    [00038] The monitoring and control system of the present disclosure is expected to be suitable for application to a gas compressor capable of gas discharge pressures of up to 68947.57 kPa 0.0703kg/cm2 (10,000 psi) or more . The system disclosed as seen in Figure 2 starts at a pressure regulator 60 placed between the process gas source 12 and the gas conditioning system 10. The gas from the conditioning system 10 is released to the sealing chambers of a associated device such as a gas compressor via the conditioned gas outlet 14.
    [00039] As compressor operating requirements push beyond current limits, there is a clear need for innovative and smart approaches to support emerging compressor markets. These main objectives of the approach are to eliminate liquid condensate, which is the leading cause of seal failures from the buffer gas stream, and also provide an alert or correction to ensure that liquid fluid does not reach the seal chambers.
    [00040] The monitoring and control system of the present disclosure is described below. It is illustrated in relation to a typical, though not exclusive, seal gas conditioning system. Generally speaking, and with reference to Figure 2, the monitoring and control system includes one or more of the elements described above.
    [00041] Pressure Regulator: Referring to Figure 2, a pressure regulator 60 is installed in the source 12 of process gas for supply to the seal chamber. The regulator is at inlet connection 12 to the piping or conduit of conditioning system 15. It receives process gas from the associated compressor for release through the system to the gas seal chambers. It reduces the hot supply gas pressure, which results from the discharge or auxiliary gas, to a manageable sealing pressure recommended for use in gas seals. This is particularly critical in high or ultra high pressure applications where there is a large disparity between compressor suction and discharge pressures. Based on gas mixture compositions, liquid condensate can form when there are changes in gas pressure and temperature. Another benefit of reducing the pressure applied upstream of the system is that in ultra high pressure applications, the control system components do not need to be classified by compressor discharge pressure.
    [00042] Gas Fluid Cooler: A cooler 62 is located after the pressure regulator 60 and before the ejection device 63 to maximize ejection efficiency.
    [00043] An eject filter 63, similar to eject filter 16 is installed downstream of cooler 62. It works as described above with reference to eject filter 16.
    [00044] Optional Heater: A heater 64 is added for applications whose local spaces require the buffer gas temperature to be elevated to prevent liquid build-up in the buffer stream. It is equivalent to heating element 22 in Figure 1.
    [00045] Optional Gas Booster: A 66 gas booster or booster can be added for applications where buffer gas may be required for start-up. It is equivalent to the pressure intensifier 20 in Figure 1.
    [00046] Liquid Sensor: In accordance with the present disclosure, a liquid sensor 70 is installed adjacent to the output of the conditioning system 14 to monitor the performance of the conditioning components. As in Figure 1, outlet 14 leads to compressor seal chambers to release clean, dry seal gas into which the non-contact seals work.
    [00047] A liquid sensor 70 is installed at the system outlet 14 which is piped into the compressor buffer supply port. Sensor 70 will monitor the buffer gas condition for any signal of liquid condensate and communicates to an intelligent pre-programmed analyzer (programmable logic controller 130, Figure 2) to indicate that the buffer gas contains liquid fluid. The programmable logic controller can initiate an output signal 130 on recognition of the liquid by the sensor.
    [00048] The sensor 70 is a custom designed spectral analyzer for the system programmable logic controller (computer) 130 via a communication connection schematically illustrated at 80. It effectively monitors the liquid content in the target fluids. The result is robust sensing technology with a highly variable form factor that can operate at very high temperatures and pressures.
    [00049] The main sensing is an optical evanescent wave sensor and can detect the presence of liquid in the gaseous flow based on the properties of a light beam emitted and received by the sensor. Electronics are UL Class 1 Div 1 approved. The main sensing 70 can be located remotely from the a (programmable logic controller 130) through a non-conductive fiber optic cable 80 and thus be placed in a completely non-electrified environment, thus improving the safety of the device.
    [00050] In recognizing the presence of liquid in the conditioned seal gas conduit 15 by the optical sensor 20, several alternative responses are contemplated. In one configuration, programmable controller 130 may simply provide an audible or visual signal to alert an operator. Alternatively, the response may include initiation of a detection sequence intended to isolate the cause of the presence of liquid. Such a sequence can proceed employing pressure and temperature sensors 100 deployed along conditioning pathway 15 as described in detail below. Any alternative combination of monitoring devices, sampling, determinations and responses by the monitoring and control system disclosed herein is covered by this disclosure.
    [00051] Pressure and Temperature Transmitters: In the arrangement illustrated in Figure 2, in addition to the sensor 70, the transmitters or pressure and temperature sensors 100 are installed at the output of the treatment components, such as the pressure regulator 60, the cooler. ador 62, ejection filter 63, heater 64 and booster 66. These transmitters or sensors 10 are also connected by a communication path 125 to the programmable logic device 130, and provide input data for determining the condition of the sealing gas in the duct 15 as will be explained.
    [00052] According to the monitoring and control system of the present disclosure, a number of pressure and temperature sensing transmitters 100 (identified by the PTI symbol) are positioned along the flow path of the sealing gas treatment arrangement . Such devices are commercially available from Honeywell Corporation and other known sources.
    [00053] As seen in Figure 2, a PTI device 100 is positioned downstream of each of the treatment or conditioning devices described including the pressure regulator 60, the cooler 62, the ejection filter 63 and the heater or device of temperature control 64. The T1 devices are in communication with the programmable device 130 (computer central processing unit (CPU)) over a communication vis 125. They provide pressure and temperature signals of the sealing gas in the various locations along the flow path of the seal gas that is conditioned prior to release to the seal gas chambers of the non-contacting seals of the associated compressor.
    [00054] The sensed data, gas pressure and temperature, are useful for recognizing the phase condition of the fluid that is treated in the seal gas system. Figure 3 is a gas phase diagram which is illustrative of the phase of a known gas. Programmable logic controller 130 includes machine readable media or memory that is provided with stored data indicative of the phase of the seal gas at various pressures and temperatures for the composition of the particular gas that is processed by the associated compressor. Such stored data is entered into the machine's memory for use by the logic controller to determine the phase of the seal gas fluid flowing at various locations from the PTI sensors.
    [00055] In a given gas compressor application the entity operating the equipment is generally aware of the composition of the process fluid. The transmitted product, while 100% gas can, for example, be 80% methane, 15% hydrocarbon and 5% heavy hydrocarbon. With knowledge of the gas composition, a phase diagram as illustrated in Figure 4 can be developed indicative of the fluid phase at various pressures and temperatures. For example, referring to Figure 3, the fluid is in a gas phase at pressures and temperatures above the dome and in a liquid phase at pressures and temperatures inside the dome.
    [00056] Pre-Programmed System Control Box: All signals from the liquid sensor 70 and the pressure and temperature transmitters 100 are connected to the programmable logic device 130 (computer control box or central processing unit (CPU) )). The CPU identifies the pressure and temperature of the seal gas fluid at each location of a PTI 10 sensor. The logic device makes a comparison with the stored data, for example, the phase diagram information illustrated in Figure 3 by a gas representative of the process gas. In this way, the logic device determines the presence of liquid concentrate in a given PTI 100 sensor device. If liquid is detected at the specific signal point, a command is sent by the computer to alert the operator to remedy the condition or take action automatically to avoid exposing the dry gas seal to the liquid, which is the leading cause of dry gas seal failures.
    [00057] The conditions sensed in the pressure-temperature sensing devices PTI(1), PTI(2), PTI(3), PTI(4) are compared to the phase diagram plotted in Figure 3. The controller logic programmable thus recognizes the state of the gas within the system at each position of the sensors and is programmed to provide an output signal (140). It will recognize a switch, including a malfunction of the associated conditioning element; such as pressure regulator 60, chiller 62, ejection filter 63, heater 64, and booster 66. Any disparity between the actual reading and the preset gas composition data may be an indication of component malfunction or failure. This can allow the operator to take appropriate action before the faces are irreparably exposed to liquid fluids.
    [00058] The output signal from programmable logic device 130 may be released for control purposes on any number of alternative responses. It can provide an alert, sound an alarm, or provide a printed record. In a more comprehensive system, it can cause an automatic response. Such response may include adjusting the operating parameters of one or more of the system's conditioning elements, or in the event of an immediate response need, shutting down the compressor.
    [00059] The programmable logic device can also be programmed to analyze the sealing gas composition in the system and recognize deviation from baseline data. It can then provide an output signal based on that offset. An example might be in a plant process disturbance situation.
    [00060] The seal gas monitoring and control system of the present disclosure is intrinsically safe and provides an early alarm if any liquid is detected in the seal gas conditioning system. A gas conditioning system includes an optical liquid recognition sensor to sense the presence of vapor or liquid condensate within the seal gas supply to an associated contactless gas seal. It is provided with an intelligent control box to initiate an output signal.
    [00061] In a conditioning system with one or more conditioning devices, the monitoring system can also include pressure and temperature sensing at the output of each of such devices. The sensed data is compared to the known seal gas compatibility phase diagram to determine if and when liquid is present. As a result, an operator can perform a diagnostic check to find the reason for the presence of liquid and initiate an item of action before the seal faces are exposed and adversely affected.
    [00062] The monitoring and control system further includes pressure and temperature sensors downstream of each unit or conditioning element to provide data to the central box on the condition of the sealing gas flowing from the associated unit. By comparing the received data with stored data about gas properties at various pressures and temperatures, it determines the location of the liquid concentrate. It provides an output signal to initiate appropriate remedial action.
    [00063] In a configuration contemplated and illustrated by the disclosure and Figure 2, the liquid sensing in sensor 70 starts a detection sequence involving the PTI sensor 100 downstream of each conditioning unit. The sensed PTI data is received by the computer and compared to pressure and temperature data stored on the machine readable medium indicative of the phase of known gas composition at various pressures and temperatures. Thus, the need for adjustment of one or more of the conditioning units, possible process gas disturbance, or other anomaly, can be isolated as the cause of the liquid phase and an appropriate response taken.
    [00064] In another particular application, it is contemplated that the sealing gas system may include conduit 15 with multiple conditioning elements such as pressure regulator 60, cooler 62, filter 63, etc., with pressure sensors and temperature 100 at the outlet of each such element, but without sensor 70 in the duct. In this case, the programmable logic controller can recognize, and respond only to, temperature and pressure data from the sensors 100 and compare to stored data from a phase diagram (Figure 3) for the known process gas.
    [00065] Variations and modifications of the above are within the scope of the present invention. It is understood that the invention disclosed and defined herein extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. All of these different combinations constitute several alternative aspects of the present invention. The embodiments described in this document explain the best known modes for practicing the invention and will be made possible for others skilled in the art to use the invention. The claims are to be interpreted to include alternative embodiments to the extent permitted by the prior art.
    权利要求:
    Claims (5)
    [0001]
    1. Monitoring and control system (10) for a non-contact seal for a gas compressor that compresses a process gas, said seal connected to a buffer gas supply system comprising: a conduit (15) having an inlet ( 12) from a source of the process gas; an outlet (14) to a chamber for a non-contact seal; at least one conditioning element (60, 62, 63, 64) between said inlet (12) and said outlet (14) of said conduit (15); said monitoring and control system (10) comprising: a pressure and temperature sensing device (PTO1, PTO2, PTO3, PTO4) associated with said at least one conditioning apparatus (60, 62, 63, 64); a programmable logic controller (130) receiving a signal from said pressure and temperature sensing device (PTO1, PTO2, PTO3, PTO4); and a source of stored data connected to said programmable controller (130); characterized in that said stored data is indicative of the phase of the process gas in relation to the pressure and temperature of the process gas; said programmable logic controller (130) compares said pressure and temperature sensed by the pressure and temperature sensor device (PTO1, PTO2, PTO3, PTO4) with said stored data to determine the phase of the gas in said sensor (PTO1, PTO2 , PTO3, PTO4); said programmable logic controller (130) sending an output signal in response to recognition of a liquid phase in the pressure and temperature sensor device (PTO1, PTO2, PTO3, PTO4).
    [0002]
    2. Monitoring and control system (10) according to claim 1, characterized in that said gas supply system includes multiple gas conditioning elements (60, 62, 63, 64) along said conduit, said system (10) further comprising a pressure and temperature sensor (PTO1, PTO2, PTO3, PTO4) downstream of each said gas conditioning element (60, 62, 63, 64), each said pressure sensor and temperature (PTO1, PTO2, PTO3, PTO4) connected to said programmable logic controller (130) to provide sensing data to said programmable logic controller (130) about the pressure and temperature of the sealing gas in said conduit (15) in each said sensor (PTO1, PTO2, PTO3, PTO4), said programmable logic controller (130) determining the gas phase downstream of each said conditioning unit (60, 62, 63, 64) and comparing sensing data with the data stored and providing an output signal in recognition of the presence of a phase liquid in one of said sensors (PTO1, PTO2, PTO3, PTO4).
    [0003]
    3. Method of monitoring and controlling a buffer gas supply system for a non-contact seal for a gas compressor that compresses a process gas, said gas supply system comprising: a conduit (15) having inlet (12) from a source of the process gas; an outlet (14) to a chamber for a non-contact seal; at least one conditioning element (60, 62, 63, 64) between said inlet (12) and said outlet (14) of said conduit (15); said monitoring and control system (10) comprising: a pressure and temperature sensing device (PTO1, PTO2, PTO3, PTO4) associated with said at least one conditioning element (60, 62, 63, 64); a programmable logic controller (130) receiving a signal from said pressure and temperature sensing device (PTO1, PTO2, PTO3, PTO4); a source of stored data connected to said programmable controller (130); characterized in that: said stored data is indicative of the phase of the process gas in relation to the pressure and temperature of the process gas; said method comprising: comparing the pressure and temperature detected by the pressure and temperature sensing device (PTO1, PTO2, PTO3, PTO4) with said stored data to determine the gas phase in said pressure and temperature sensing device (PTO1, PTO2, PTO3, PTO4); and sending an output signal in response to recognition of a liquid phase in said pressure and temperature sensing device (PTO1, PTO2, PTO3, PTO4).
    [0004]
    4. Method of monitoring and controlling a buffer gas supply system (10) according to claim 3, characterized in that said gas supply system (10) includes multiple gas conditioning elements (60, 62 , 63, 64) along said conduit (15), with a pressure and temperature sensor (PTO1, PTO2, PTO3, PTO4) downstream of each said gas conditioning element (60, 62, 63, 64), each said pressure and temperature sensor (PTO1, PTO2, PTO3, PTO4) connected to said programmable logic controller (130) to provide data to said programmable logic controller (130) about sealing gas pressure and temperature in said conduit (15) at each said sensor (PTO1, PTO2, PTO3, PTO4), said method further comprising: determining the phase of the gas downstream of each said conditioning unit (60, 62, 63, 64) by comparing the sensed data with said data stored and provide an output signal in recognition of the presence of a liquid phase in a d. said sensors (PTO1, PTO2, PTO3, PTO4).
    [0005]
    5. Monitoring and control system (10) for a non-contact seal for a gas compressor, according to claim 1, characterized in that a liquid sensor (70) is disposed in said conduit (15) between the said at least one conditioning element (60, 62, 63, 64) and said output (14) for sensing the presence of liquid and wherein said liquid sensor (70) comprises an optical device in the form of an optical device. evanescent wave and wherein said optical device is connected to an output device (130) responsive to the recognition of liquid present in said conduit (130) in said liquid sensor (70) to provide an output signal.
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    法律状态:
    2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-01-21| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-03-02| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-05-18| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 01/08/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US201161514732P| true| 2011-08-03|2011-08-03|
    US61/514,732|2011-08-03|
    PCT/US2012/049196|WO2013019884A2|2011-08-03|2012-08-01|Seal gas monitoring and control system|
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