• 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:
    1. The method of removal of gases introduced during the decomposition of ethylene in high-pressure apparatus, which consists in removing gases from the apparatus when the safety device in the wall of the apparatus breaks down to the external environment through cooling devices, while the cooling of gases begins with a time delay in which that, in order to increase the fire, and the process safety, the time delay is within 12-23 ISS, cooling is carried out with water supplied to the cooling device with nitrogen under pressure 10 -50 bar.
    公开号:SU1131470A3
    申请号:SU802909904
    申请日:1980-04-21
    公开日:1984-12-23
    发明作者:Нарди Ален；Симье Жан-Ноэль
    申请人:Сосьете Шимик Де Шарбоннаж (Фирма)；
    IPC主号:
    专利说明:

    2. An apparatus for carrying out the method of claim 1, consisting of a first tank filled with nitrogen under pressure, a second tank completely filled with water and connected to the first tank, a connecting pipe between the second tank 311470
    the bone and the volume into which the gases of ethylene are supplied from the apparatus under high pressure, the end of which, closest to the specified volume, is supplied with a dispersing device for water, and a valve between the second tank and the dispersing device.
    one .
    The invention relates to a method
    reducing the hazards of ignition and explosion resulting from the decomposition of ethylene in high pressure polymerization apparatus, as well as devices for carrying out this process, and can be used in chemical industry ..
    During the reaction, polymerizing, ethylene under high pressure. (about 300-3000 bar) and at high temperature (about 150-E50 ° C) some undesirable phenomena during installation operation, such as mechanical damage or insufficient purity of ethylene gas, despite careful control of pressure and temperature parameters, can cause heating, to a temperature that exceeds the fraction of ethylene, even the most insignificant, contained in a polymerization reactor or in a separator (usually operating under a pressure of 100-500 bar). Such heating is quite enough to cause the decomposition of this fraction of ethylene in a mixture of carbon, hydrogen and methane.
    In addition, the specified operating conditions of the reactor and the separator are such that they allow fast expansion of all the commenced decomposition, which certainly leads to a rapid increase in pressure and / or temperature. The rupture of at least one safety device (protective disc, valve, valve) protects the reactor and the separator from excessive pressures and allows decomposition products to be expelled to the external environment. In addition to the contamination caused by the removal of powdered carbon into the external environment, it is necessary to be especially wary of igniting decomposition gases, which can cause violent explosions that can cause material damage and damage to people. All this makes it necessary to discharge decomposition gases without ignition and explosion. .
    There is a known method for removal of gases released during the decomposition of ethylene in high-pressure apparatus, which consists in removing gases from the apparatus during the safety of the device in the apparatus wall to the external environment through cooling devices, and the cooling of gases begins with a time delay ( safety device until the moment when gas enters the cooling device) within 50-100 μs
    It is also known a device for the removal of gases introduced during the decomposition of ethylene in high-pressure apparatus, which is a tubular chimney directly connected to the apparatus under high pressure and separated from it by a safety device in the wall of the apparatus 1).
    However, the known method and apparatus do not provide complete reliability in preventing ignition and explosion of decomposition gases.
    . This is explained as follows. In contrast to the positions known in the art, the spontaneous combustion of decomposition gases under the influence of their higher temperature is not necessarily the main cause of the ignition of these gases, and more often only secondary. This is confirmed by the results of experiments conducted in the absence of decomposition in the reactor and carried out at least one of the safety devices with a rupture, while the ethylene temperature at the time preceding the rupture does not exceed 200 C.
    Moreover, despite the absence of abnormal heating until the safety device breaks, removal of ignited gas is observed at the outlet of the flue gas network (chimney), and it is possible to demonstrate the presence of a shock wave propagating at a speed of about 500-700 m / s. This is due to the fact that after the safety device breaks down, the air contained in the drainage network (the chimney and initially stationary is moving under the pressure wave at a speed depending on its strength and the speed of sound in this medium. Pressure wave, which precedes the flow of ethylene and decomposition gases into the network of exhaust (exhaust duct), compresses and heats the air contained in the network of exhaust. Also, if the network of exhaust gases is not completely linear, but has at least one is bent section, the lateral side wall of the reactor or separator with a vertical section of the chimney, or a change in cross section, the pressure wave is usually not flat and thus reflects off the walls of the gas outlet network; these reflections of the pressure wave provide opportunities for focusing the waves on the network the removal and, therefore, the possibility of heating certain points in the gas removal network. The possibility of successive reflections of the safety disc from the walls of the chimney is the third cause of local heating, It is heated under the influence of a pressure wave and increases the overall thermal effect.
    The above described phenomena of heating of the absence of any decomposition of ethylene are sufficient to bring the temperature at some points of the chimney to a higher value. The phenomena of diffusion, the difference in the velocity of the gas flowing in the chimney between its walls and the axis of symmetry, changes in the cross section of the direction of the chimney contributes to local
    the formation of pre-mixing zones of air and gas. It is at the interface of the hot air-ethylene mixture, which moves at a speed lower than the pressure wave velocity and which as a result follows a given pressure wave, i.e. in the plane of these pre-mixing zones, ignition begins. Then these pre-mixing zones are entrained with exhaust gas to the outer part of the chimney. Thus, they quickly disappear from the chimney in the process of air displacement by gas. In addition, the flame is carried by the effluent to the exit area of the chimney, where it is maintained for a period of time for exhaust gases. The gas ignition under the action of this pressure wave contributes to the increased temperature of this gas, which results in an increase in the temperature of the air-gas mixture and, as a result, the decomposition gas is more susceptible to ignition under the influence of a pressure wave than ethylene at 200 C. This increase in the temperature of the mixture is air the gas results in the spontaneous combustion of decomposition gases under the influence of their temperature directly.
    From this it follows that for solving the problem the most important is the process parameter in time from the moment of opening the safety device to the end of the gas release. However, according to a known method, this parameter within 50-100 µs does not provide sufficient efficiency, since most often the duration of the transient phase of the flow stream, which causes the effect of the pressure wave, is much less.
    The purpose of the invention is to increase the fire and explosion safety of the process.
    The goal is achieved by the fact that according to the method of exhaust gases introduced during the decomposition of ethylene in high-pressure apparatus, consisting in the removal of gases from the apparatus during the destruction of the safety device in the apparatus wall to the external environment through cooling devices, the cooling of gases begins with a delay time, the last hold within 12I 23 of the ISS, cooling is carried out
    权利要求:
    Claims (2)
    [1]
    1. The method of evacuation of gases released during the decomposition of ethylene in high-pressure apparatuses, which consists in removing gases from the apparatus during the destruction of the safety device in the apparatus wall into the external environment through cooling devices, while gas cooling begins with a time delay, characterized in that that, in order to increase the fire and explosion safety of the process, the time delay is maintained within 12-23 μs, the cooling is carried out with water supplied to the cooling device with nitrogen at a pressure of 10-50 bar.
    [2]
    2. A device for implementing the method according to claim 1, consisting of a first tank filled with nitrogen under pressure, a second tank completely filled with water and connected to the first tank by a pipe, a connecting pipe between the second tank and the volume into which the gases of the ethylene arrangement enter from the apparatus under high pressure, the end of which, closest to the indicated volume, is equipped with a dispersing device for water, and a valve between the second tank and the dispersing device.
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    同族专利:
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    PT71119A|1980-05-01|
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    引用文献:
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    DE2631834C3|1976-07-15|1980-05-14|Basf Ag, 6700 Ludwigshafen|Process for the expansion of ethylene high pressure polymerization systems|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FR7910444A|FR2455239B1|1979-04-25|1979-04-25|
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