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System and method for preparing hydrogen rich gas and liquid methane

A liquid methane and hydrogen-rich technology, applied in refrigeration, liquefaction, liquefaction, hydrogen separation, etc., can solve the problems of waste and consumption, and achieve the effects of saving power consumption, good rectification effect, and large operating flexibility

Inactive Publication Date: 2015-12-23
KAIFENG AIR SEPARATION GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The Chinese patent with the application number 201320852728.8 and the name of the device for producing liquefied natural gas and hydrogen-rich products from methane-rich gas, although the application number is 201210065876.5 and the name is the process of dehydrogenating nitrogen from methane-rich gas and producing liquefied natural gas. The Chinese patent and application number of the device is 210010291609.5, and the Chinese patent titled the process of dehydrogenation, nitrogen, carbon monoxide from methane-rich gas and producing liquefied natural gas has some improvement in refrigeration effect, but at the cost of consuming external frozen water, The chilled water is made by cooling the lithium bromide air conditioner, and the lithium bromide air conditioner still needs to consume a part of steam, so it causes certain limitations to the use and causes a kind of waste

Method used

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  • System and method for preparing hydrogen rich gas and liquid methane

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Embodiment 1

[0028] like figure 1 As shown, a system for producing hydrogen-rich gas and liquid methane mainly includes a purge gas purification unit and a low-temperature liquefaction separation unit. The low-temperature liquefaction separation unit includes a liquefaction cold box system, a mixed refrigerant cycle compression system and a nitrogen cycle compression system; the liquefaction cold box system includes a first plate-fin heat exchanger 1, a second plate-fin heat exchanger Device 3, high-pressure rectification tower 4, low-pressure rectification tower 6, and exhaust gas expander 14; Described high-pressure rectification tower 4 tower tops are provided with first condenser 7, and described low-pressure rectification tower 6 tower bottoms are provided with There is an evaporator 2, and the top of the tower is provided with a second condenser 8; the mixed refrigerant cycle compression system includes a primary mixed refrigerant compressor 21, a primary cooler 22, a secondary mixed...

Embodiment 2

[0035] A method for producing hydrogen-rich gas and liquid methane. The synthetic ammonia or methanol purge gas with a pressure of 1.6MPa~7.0MPa passes through the purification unit 26, and the trace amount of CO in the purge gas is absorbed by the adsorbent in the purification unit. 2 and water are removed, and the relaxed gas after removing impurities enters the first plate-fin heat exchanger 1 and is cooled to 145K~165K, and enters the low-pressure rectification tower evaporator 2 as a heat source to be further cooled, and the temperature after cooling is 135K ~ 155K, enter the second plate-fin heat exchanger 3 and cool to 110K ~ 117K, the gas after cooling enters the high-pressure rectification tower 4 for rectification separation, and the purity obtained at the top of the high-pressure rectification tower is 91.4 %mol of hydrogen enters the cold end 30 of the second plate-fin heat exchanger and the cold end 32 of the first plate-fin heat exchanger to reflow and reheat to o...

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Abstract

The invention relates to a system and method for preparing hydrogen rich gas and liquid methane. The system mainly comprises a purge gas purification unit and a low-temperature liquidation and separation unit. By means of mixed refrigerant compression circulating refrigeration, nitrogen circulation compression refrigeration and waste gas expansion refrigeration, hydrogen rich gas and liquid methane are obtained by conducting rectification and separation on synthesis ammonia or methyl alcohol purge gas in an efficient rectifying tower, the flow is simple, the energy consumption is low, and the recovery rate is high. The system and method for preparing hydrogen rich gas and liquid methane are high in reliability, low in running cost and high in product purity.

Description

technical field [0001] The invention relates to the field of gas separation, in particular to a system and method for producing hydrogen-rich gas and liquid methane from synthetic ammonia or methanol purge gas. Background technique [0002] Ammonia or methanol is one of the important raw materials of basic organic chemical industry. The synthesis of ammonia or methanol mainly uses coal or natural gas as raw material. After a certain transformation, synthesis gas is obtained. In my country, ammonia synthesis or methanol production enterprises mainly use coal as raw material. In addition to producing effective components CO and H in the process 2 In addition, CH 4 and N 2 and other invalid gases. As the reaction proceeds, a large number of invalid components accumulate to affect the conversion rate of the reaction. The invalid components need to be discharged from the device to produce a large amount of synthetic ammonia or methanol purge gas. The main components of purge gas...

Claims

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Application Information

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IPC IPC(8): F25J3/02F25J5/00C07C9/04C01B3/50
CPCF25J2215/04F25J3/0233F25J3/0252F25J2270/18F25J2270/66F25J2270/04F25J2200/74F25J2290/34F25J2270/12F25J2270/42F25J2210/20F25J2210/12F25J2200/40F25J3/0219
Inventor 韦向攀王剑峰卓跃光孙宇
Owner KAIFENG AIR SEPARATION GROUP
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