System and method for preparing high purity carbon monoxide and hydrogen-enriched co-production liquid methane

A carbon monoxide and liquid methane technology, which is applied in refrigeration and liquefaction, liquefaction, lighting and heating equipment, etc., can solve the problems that the value of methane is not reasonably utilized, the rational use of methane is not proposed, and the process is complicated, so as to achieve low investment and reduce impurities. requirements, the effect of high recovery rate

Inactive Publication Date: 2016-08-17
KAIFENG AIR SEPARATION GROUP
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  • Abstract
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Problems solved by technology

[0004] Liquid methane is a clean and efficient energy source with high calorific value and easy transportation. The CO and H released by China 2 In the low temperature separation and purification method, only CO and H are considered 2 Separation and purification, in the case of high content of nitrogen and methane, methane is discharged together with other impurities as fuel, the value of methane has not been rationally utilized, and the

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  • System and method for preparing high purity carbon monoxide and hydrogen-enriched co-production liquid methane

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Embodiment 1

[0023] like figure 1 As shown, a system for producing high-purity carbon monoxide and hydrogen-rich gas for co-production of liquid methane mainly includes a feed gas purification unit 2, a low-temperature liquefaction separation unit 4, a CO product compressor 3, and a mixed refrigerant compressor 1; The low-temperature liquefaction separation unit includes a main heat exchanger 5, a methane washing tower 6, a dehydrogenation tower 7, a demethanization tower 8, and a denitrogenation tower 9, and a first evaporator 10 is provided at the bottom of the dehydrogenation tower. The bottom of the demethanizer is provided with a second evaporator 11, the top of the tower is provided with a first condenser 13, the bottom of the denitrification tower is provided with a third evaporator 12, and the top of the tower is provided with a second condenser 14 The inlet of the purification unit 2 is communicated with the first pipeline 100, and the outlet of the purification unit is communicat...

Embodiment 2

[0028] A method for producing high-purity carbon monoxide and hydrogen-rich gas to co-produce liquid methane. The raw material gas with a volume content of 0.5%~10% of methane and a volume content of nitrogen of 4%~8% passes through the first pipeline at a pressure of 3.0MPa~6.0MPa. After entering the purification unit, the trace amount of CO in the raw gas is absorbed by the adsorbent in the purification unit 2and water are removed, and the raw material gas after removing impurities enters the main heat exchanger through the second pipeline and is cooled to ~100K. After cooling, it enters the methane washing tower through the third pipeline to wash the methane in the raw material. The hydrogen-rich gas with a hydrogen volume content of more than 77% is obtained from the outlet of the gas phase at the top of the tower. The hydrogen-rich gas enters the main heat exchanger through the fourth pipeline to recover the cooling capacity and is reheated. After reheating, the hydrogen-r...

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Abstract

The invention relates to the field of low-temperature gas separation, in particular to a system and method for preparing high purity carbon monoxide and hydrogen-enriched co-production liquid methane. The system mainly comprises a raw material gas purification unit, a low-temperature liquefying separation unit, a CO product compressor and a mixed refrigerant compressor. The low-temperature liquefying separation unit comprises a main heat exchanger, a methane washing tower, a dehydrogenation tower, a demethanization tower and a denitrification tower. A first evaporator is arranged at the bottom of the dehydrogenation tower; a second evaporator is arranged at the bottom of the demethanization tower; a first condenser is arranged on the top of the demethanization tower; a third evaporator is arranged at the bottom of the denitrification tower; and a second condenser is arranged on the top of the denitrification tower. According to the system and method, while high purity products rich in H2 and CO are obtained through four-tower process flow, high purity liquid methane can be obtained; the adaptability of a device to raw material gas is high; the requirement for raw material gas purities of the device is lowered; and part of CO is extracted from the tail stage or the middle stage of the CO product compressor to be used as a cold source and a heat source of a rectifying tower circularly according to the pressure of CO product gas, a nitrogen compressor and an expander are omitted, the number of devices is small, and the investment is small.

Description

technical field [0001] The invention relates to the field of gas low-temperature separation, in particular to a system and method for producing high-purity carbon monoxide and hydrogen-rich gas to co-produce liquid methane. Background technique [0002] CO and H 2 It is an important synthetic raw material in the chemical process, and is widely used in the synthesis of a series of organic chemical products and intermediates, while CO and H 2 The preparation of coal, natural gas or oil is generally used as raw materials, and it is obtained through a certain method transformation. In the preparation process, the effective components CO and H are removed. 2 In addition, a certain amount of CH 4 , N 2 , CO 2 Such impurities exist in the form of mixtures, and chemical synthesis processes usually require high-purity CO, which requires a suitable method to separate and purify the mixture. [0003] CO and H 2 The separation methods mainly include pressure swing adsorption, mem...

Claims

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Application Information

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IPC IPC(8): F25J3/02F25J5/00
CPCF25J3/0223F25J3/0233F25J3/0252F25J3/0257F25J3/0261F25J2200/70F25J2200/72F25J2215/04F25J2270/02F25J2270/12F25J2270/24F25J2270/66F25J2290/34F25J5/00F25J2210/18F25J2215/60
Inventor 韦向攀卓跃光王庆波魏明明苏建龙郑树亮
Owner KAIFENG AIR SEPARATION GROUP
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