• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to installations for drying and burning brown coal. The purpose of inventions is to increase efficiency. The plant for drying and burning fuel, mainly brown coal, contains a fluidized bed furnace 1 connected to the gas duct 17 through the entrainment separator 2 as an external cyclone with a chute separator, as well as to the liquefying air supply line 18 and the pipeline 19 for removing part of the boiling material lay A boiling bed dryer 3 is connected to the latter, connected in turn with lines 20-22 of supply of liquefied gas and line 23 of exhaust gas removal, heat exchangers 6.1–6.3 with heating and heated sides and a dust separator 4. Separate Leak wound up by the discharge end on top of the dryer 3 under the level of its layer Line 23 through the heated side of the heat exchanger 6.1 and the dust separator 4 is connected to the heating side of the heat exchanger 7 connected by the heated side to the supply line of liquefying air into the furnace, as well as to the boiling layer of the dryer 3 through the nozzle additionally installed in its bottom with the possibility of vertical movement and interacting with the outlet end of the chute of the separator 2 to form a valve for controlling the flow rate of the separat. 2 Il. (Ls
    公开号:SU1695091A1
    申请号:SU877774579
    申请日:1987-08-31
    公开日:1991-11-30
    发明作者:Букк Иоганнес；Кипке Герт；Шульт Эгон；Вайс Эберхардт
    申请人:Феб Бергманн-Борзиг (Инопредприятие)；Основное Предприятие Комбината Крафтверксанлагенбау (Инопредприятие)；
    IPC主号:
    专利说明:

    The invention relates to installations for drying and burning fuel and waste, in particular raw ordinary brown coal in a fluidized bed furnace using a fluidized bed dryer for drying fuel.
    It is known to burn carbon-containing substances in a fluidized bed furnace. When determining the parameters of such installations, it must be taken into account that, at a high moisture concentration in the combustible substance, the evaporating amount of water is crucial for calculating the cross section of the furnace.
    The next limitation is cost effectiveness. It can be assumed that every kilogram of water that comes with a combustible substance gives a production loss of 1 kg of steam. In order to achieve a high efficiency in the production of steam, it is necessary to ensure that the moisture content in the combustible substance is as low as possible.
    In addition to tube dryers, steam vortex dryers are also known for drying raw raw brown coal. The use of vortex steam technology is an effective method, since only with a small supply of energy can energy be reused. These dryer methods have not yet been applied as pre-installed units or combined units, since the investment costs do not correspond to the costs of the overall installation.
    The next drying unit for brown coal containing a lot of water, in which the coal to be dried is preheated, using steam, is dried at a pressure above atmospheric. This installation also has high hardware costs and is additionally associated with the use of hot wastewater, which is not always available.
    In addition, there is a known installation for drying coal for steam boilers or vortex furnaces, in which the drying of wet coal is carried out by steam taken from turbines, which heats several drying chambers, which are located on the way from the coal bunker to the furnace. Since steam taken from the turbine after its start-up cannot immediately be provided for use, coal drying can only be carried out with a time delay. .
    A fluidized bed furnace with a heat exchanger has already been proposed, through which the energy of the secondary gas vapor mixture that occurs, for example, in the drying or evaporation processes above the base, in this case, when vacuum is generated, returns to the fluidized bed furnace, and a compressor is provided for the implementation of the fluidized bed . The solution is not suitable for technological combination with circulating fluidized bed combustion.
    The closest technical solution to the proposed one is a unit for drying and burning fuel mainly of brown coal, containing a fluidized bed furnace, connected to a gas duct through an ablation separator, as well as to a fluidizing air supply line and a pipe for removing part of the fluidized bed material, the last of which is connected to a dryer fluidized bed, connected, in turn, respectively, with the supply lines of a fluidizing gas and exhaust gas.
    This embodiment is not suitable for economical drying and burning of wet ordinary brown coal.
    The aim of the invention is to provide a device that provides economical drying and burning of combustible substances and waste, in particular wet ordinary brown coal.
    This goal is achieved by the fact that in the installation for drying and burning fuel mainly brown coal containing a fluidized bed furnace connected to a gas duct through an ablation separator, as well as to a fluidizing air supply line and a pipe for removing part of the fluidized bed material, the last of which is connected to a dryer fluidized bed, which, in turn, is connected, respectively, with supply lines of a fluidizing gas and exhaust gas, in accordance with the invention in the installation Additionally contains heat exchangers with heating and the heated sides and a dust separator, and the ablation separator is made in the form of an external cyclone with a separator flow, forming the aforementioned pipe for withdrawing a part of the fluidized bed material and brought by the outlet end from above into the dryer below the level of its layer, the exhaust gas line of the dryer through the heated side of one of the heat exchangers and a dust separator connected respectively to the heating side of another heat exchanger connected by the heated side to the fluidizing air supply line to the furnace, as well as to the fluidized bed of the dryer of nozzle further mounted in its bottom with a vertically movable and engagement with said outlet end of the cyclone heat to form a valve for controlling the flow separators.
    The combustion air in the fluidized bed furnace is preheated with a mixture of air and a water peer from a combustible substance.
    In accordance with the following acknowledgment. In the invention, air and water vapor from a combustible substance are fed into a cyclone.
    A further feature of the invention is the maintenance of a higher steam pressure in the circuit compared to a fluidized bed furnace.
    A feature of the invention is that the fluidized bed dryer operates at a speed of from 0.6 to 2 m / s, preferably 1 m / s, and the fluidized bed furnace operates at a speed of 2 to 12 m / s, preferably 8 m / s.
    In accordance with the invention, it is furthermore provided that the circulation circuit for a solid and the circulation circuit for steam can operate under pressure.
    In the case of turning the unit on and off, when there is still no steam in the circulation circuit, flue gas is supplied to it and it is inertized, as a result of which there can be no explosion of dust from a combustible substance. The heat of vaporization transferred from the separator to the fuel in the fluidized bed dryer can be recovered by removing excess steam in the circulation circuit and introducing it into the steam condenser for the most part at high temperatures of 100 ° C and is not released with flue gas through the pipe into the atmosphere, as it was before so far.
    As a result, the necessary cross-section of the pipe can be reduced.
    Figure 1 schematically shows an installation for drying and burning fuel; figure 2 - the interaction node estrus separate with an additional pipe in the dryer.
    The apparatus consists of a solid circuit and a steam circuit, which are connected according to the invention by a fluidized bed dryer 3. The solids circulation loop is formed from a fluidized bed furnace 1 with a high solids yield, an ablation separator 2 in the form of a cyclone for separating the solids and a fluidized bed dryer 3. The steam circuit consists of a fluidized bed dryer 3 with operations for drying the fuel, loading it into the furnace 1 of a fluidized bed, heat exchangers 6.1, 6.2, 6.3 and 7, a dust collector 4 and a blower 5.
    The installation for drying and burning fuel also contains a feeder 8 with a cell drum and an inlet pipe 9 for brown coal in the upper part of the dryer 3, an outlet pipe 10 for supplying dried coal to the furnace 1 of the fluidized bed, an inlet pipe 11 for the separator, a valve 12 on the line selection of spent fluidizing air and steam from the dryer 3, an additional nozzle 13 with a plate 14 mounted in the bottom of the dryer with the possibility of vertical movement and interacting with the estrus 24 of the separator from the separator 2 with the formation of a valve between them to regulate the flow rate of the separator, the inlet pipe 15 for fluidizing air, the exhaust pipe 16 for exhaust air in the dryer 3, the duct 17 from the furnace 1, the supply line 18 of the fluidizing air into the furnace 1, the pipe 19 for removing part of the fuel to the dryer, made in the form of estrus 24, fluidizing gas supply lines 20, 21 and 22 to the dryer 3, exhaust air exhaust line 23 from the dryer 3.
    Installation works as follows.
    Solid coming out of the furnace
    1, is separated in the cyclone ablation separator 2 and enters through the inlet pipe 11 for solids into the fluidized bed dryer 3. By installing an air inlet pipe 13 moved relative to the base of the dryer with a plate 14, an adjustable column of solid is formed in the solid inlet 11, which separates the steam circuit from the solid circuit. In the fluidized bed dryer 3 through the feeder 8 with a cell drum and the inlet pipe 9 for solid substance is supplied ordinary brown coal with mine moisture. The water contained in the ordinary brown coal is evaporated by heat transfer from the separator located in the dryer 3 and fluidizing the air. In this case, the separator is cooled. The separator can be further cooled using the heat carrier used in the heat exchanger 6.2, as a result of which the temperature in the heat exchanger can be controlled 7. The cooled separator and dried fuel enter through the outlet pipe 10 from the dryer 3 into the furnace 1 of the fluidized bed. At the same time, a solid column is formed in the outlet pipe 10, which also serves to separate the steam circulation circuit from the solid circuit. The fuel vapor resulting from the dryer 3 and process steam are discharged through the heat exchanger 6.1 and then cleaned in the dust collector 4. The supercharger 5 maintains the required pressure in the steam circulation circuit and partially supplies the steam back to the dryer 3. Another part of the steam can be passed through an air pre-heater ( the heat exchanger 7), as a result of which the air needed for combustion 5 in the furnace 1 is preheated. There is also an additional opportunity to supply part of the steam with dust from the dryer 3 to the cyclone separator 2 through the valve 12. In addition, the installation is additionally equipped with another heat exchanger 6.3, which can give off heat to other systems that was not used in this process.
    权利要求:
    Claims (1)
    [1]
    '' Claims 15
    Installation for drying and burning fuel. predominantly brown coal, containing a fluidized bed furnace connected to a gas duct through an ablation separator, as well as to a fluidizing air supply line and a pipe for removing part of the fluidized bed material, the last of which is connected to a fluidized bed dryer, connected, in turn, respectively with supply lines for fluidizing gas and exhaust gas, characterized in that, in order to increase efficiency, it additionally contains heat exchangers with heating and heated sides and a dust separator, and an ablation separator in made in the form of an external cyclone with a separator flow, forming the above-mentioned pipeline for withdrawing part of the fluidized bed material, brought by the outlet end from above into the dryer below the level of its layer, the exhaust gas line of the dryer through the heated side of one of the heat exchangers and the dust separator is connected respectively to the heating side of the other heat exchanger, included by the heated side into the fluidizing air supply line to the furnace, as well as to the fluidized bed of the dryer through a pipe additionally installed in its bottom with With the help of vertical movement and interaction with the outlet end of the said cyclone estrus with the formation of a valve for regulating the flow rate of the separat.
    Fie. 2
    类似技术:
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    同族专利:
    公开号 | 公开日
    FI874909A0|1987-11-05|
    DE3726643A1|1988-05-11|
    FI874909A|1988-05-07|
    CS639887A1|1990-04-11|
    DD262559A3|1988-12-07|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4955295A|1989-08-18|1990-09-11|Foster Wheeler Energy Corporation|Method and system for controlling the backflow sealing efficiency and recycle rate in fluidized bed reactors|
    DE4102959C2|1991-02-01|1992-11-12|Metallgesellschaft Ag, 6000 Frankfurt, De|
    FI89742C|1991-11-27|1993-11-10|Imatran Voima Oy|OVER ANCHORING FOR TORKNING AV BRAENSLE I EN VIRVELBAEDDSPANNA|
    DE4321680C1|1993-06-30|1994-04-14|Metallgesellschaft Ag|Method for drying fuel contg. water - involves direct contact with hot, granular, solid, residual material|
    DE4408635C2|1994-03-09|1997-03-27|Ver Energiewerke Ag|Method and arrangement for supplying pre-crushed coal, in particular raw lignite, to a circulating pressure-charged fluidized bed furnace|
    DE4409056C2|1994-03-11|1998-03-26|Ver Energiewerke Ag|Method and arrangement for pre-drying broken raw lignite for a pressure-charged fluidized bed furnace|
    AT404181B|1994-03-17|1998-09-25|Austrian Energy & Environment|METHOD FOR DISASSEMBLY, IN PARTICULAR COMPLETE COMBUSTION|
    FI110205B|1998-10-02|2002-12-13|Foster Wheeler Energia Oy|Method and apparatus in a fluidized bed heat exchanger|
    FR2845982B1|2002-10-16|2005-03-04|Thel Etb|FLUIDIZED FLUIDIZED BED-SLUDER INCINERATOR CONTROLLING SLUDGE IN A LOWER PART OF THE BED- PNEUMATIC INTRUSION DRY SLUDGE AND CIRCULATING MASS BASED IN INCINERATOR|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DD29598586A|DD262559A3|1986-11-06|1986-11-06|METHOD AND DEVICE FOR DRYING AND COMBUSTION OF COMBUSTION AND WASTE MATERIALS, PARTICULARLY HUMIDIFIED RAW BROWN COAL|
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