Liquid nitrogen wash device and method for purifying raw material gas
A raw material gas and liquid nitrogen washing technology, which is applied in the field of liquid nitrogen washing equipment and raw material gas purification equipment, can solve the problems of difficult operation, complicated process flow, recycling and comprehensive utilization, etc., and achieve flexible operation and high process efficiency. The effect of simple process
Active Publication Date: 2015-04-15
BEIJING XINFENG TAIKE ENG TECH
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Problems solved by technology
[0003] However, some of the existing liquid nitrogen washing devices are designed for CH 4 The content of the process gas is a trace amount, for the high CH produced by the Lurgi gasification process 4 content of the process gas cannot be handled when CH 4 CH is generated when the process gas with high content is passed through 4 In the case of freezing blockage, let alone recovery and comprehensive utilization; some devices can handle the high CH produced by the Lurgi gasification process 4 content of process gas, but the process is complicated and the operation is difficult
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[0019] Such as figure 1 Shown is a kind of liquid nitrogen washing device according to the present invention, comprising a cold box 7, a high-pressure nitrogen cooler 3, a first raw gas cooler 1, a second raw gas cooler 2, a raw gas cooler 7 are arranged in the cold box 7 Liquid separator 6, nitrogen washing tower 4 and several pipelines. The raw gas pipeline treated by the molecular sieve adsorber is introduced into the cold box 1, first introduced into the first raw gas cooler 1 for cooling, and then introduced into the second raw gas cooler 2 for cooling, and the raw gas pipeline is from the second raw gas cooler 2, and then introduced into the raw gas gas-liquid separator 6 to separate the liquid methane components in the raw gas. The separated raw gas pipeline drawn by the raw gas gas-liquid separator 6 is introduced again into the second raw gas cooler 2 for cooling, then drawn from the bottom of the second raw gas cooler 2, and finally introduced into the lower part of...
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The invention relates to a liquid nitrogen wash device which comprises an ice chest. The ice chest is internally provided with a high-pressure nitrogen cooler, a first raw material gas cooler, a second raw material gas cooler, a raw material gas liquid separator, a nitrogen wash tower and a plurality of pipelines, and further comprises a temperature control bypass arranged in a raw material gas pipeline and partially connected with the raw material gas pipeline passing through the first raw material gas cooler in parallel. The temperature control bypass comprises a temperature control valve. A temperature sensor is further arranged on the raw material gas pipeline at the inlet of the raw material gas liquid separator. The temperature sensor is communicated with the temperature control valve in signal. The temperature control valve responsive to the signal sent by the temperature sensor opens or closes to a corresponding opening degree. The invention further discloses a method for purifying the raw material gas.
Description
technical field [0001] The invention relates to a device for purifying raw gas, in particular to a liquid nitrogen washing device. The invention also relates to a method of purifying raw gas. Background technique [0002] The liquid nitrogen scrubbing method is the final purification technology for crude syngas. It is mainly used to remove CO and CH in crude synthesis gas 4 and other trace components, and at the same time, it also mixes nitrogen with the synthesis gas to meet the requirement of ammonia synthesis for H 2 , N 2 Proportional requirements. The principle of its purification is: use liquefied high-pressure nitrogen to wash the raw material gas in the nitrogen washing tower, so as to remove trace components such as CO in the crude synthesis gas. The cooling loss of the liquid nitrogen washing device (i.e. heat transfer temperature difference loss and cold loss) is compensated by the cold effect produced by the Joule-Thomson effect in the nitrogen distribution ...
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IPC IPC(8): C01B3/52
Inventor 钱军柴庆波张文静
Owner BEIJING XINFENG TAIKE ENG TECH