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Cascade type liquefaction process for precooling coalbed methane (CBM) by residual pressure of pressure swing adsorption (PSA)

A pressure swing adsorption and coalbed methane technology, which is applied in the liquefaction process of coalbed methane and the cascade liquefaction process of coalbed methane, can solve the problems of insignificant energy saving effect of coalbed methane, and achieve the effect of significant energy saving effect and reduction of liquefaction power consumption.

Inactive Publication Date: 2010-01-13
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Zhu Jiaxin, who majored in refrigeration and low temperature at Shanghai Jiaotong University, used the adsorption-liquefaction method to realize the liquefaction of coalbed methane in his master's thesis, directly using the residual pressure of coalbed methane after pressure swing adsorption separation to reduce the compression work of coalbed methane, but due to cascade In the conventional liquefaction process, the compression work of the refrigerant accounts for a large share of the overall power consumption of the system, so the energy saving effect is not obvious only by reducing the compression work of coalbed methane

Method used

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  • Cascade type liquefaction process for precooling coalbed methane (CBM) by residual pressure of pressure swing adsorption (PSA)
  • Cascade type liquefaction process for precooling coalbed methane (CBM) by residual pressure of pressure swing adsorption (PSA)

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Embodiment approach 1

[0020] Implementation Option 1: If figure 1 As shown, the coalbed methane cascade liquefaction process using pressure swing adsorption residual pressure precooling for three-stage cooling when the temperature of coalbed methane precooling is greater than -55 ° C includes the following steps:

[0021] 1. Water, acid gas and heavy hydrocarbon impurities are removed in the pre-purification system 1 of the pressurized normal-temperature coalbed methane raw material gas;

[0022] 2. The pre-purified coalbed methane is concentrated in the adsorber 2 through the pressure swing adsorption process, and the concentrated coalbed methane with residual pressure nitrogen and normal pressure is separated;

[0023] 3. The concentrated coalbed methane is compressed to a medium pressure of 0.6-0.8 MPa by the primary methane compressor 4 and compressed by the secondary methane compressor 6 to be greater than or equal to 4.5 MPa, and is respectively cooled in the first cooler 5 and the second coo...

Embodiment approach 2

[0027] Implementation Option 2: If figure 2 As shown, the coalbed methane cascade liquefaction process using pressure swing adsorption residual pressure precooling for secondary cooling when the temperature of coalbed methane precooling is lower than -55 ° C includes the following steps:

[0028] Step 1, step 2, step 3 and step 4 are respectively the same as step 1, step 2, step 3 and step 4 in embodiment 1;

[0029] 5. The pre-cooled concentrated coalbed methane is cooled to -110°C by the third heat exchanger 10 and cooled to -160°C by the fourth heat exchanger 11 respectively to become low-temperature coalbed methane. All the other processes are the same as Step 5 in Embodiment 1.

[0030] Step 6 is the same as Step 6 in Embodiment 1.

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Abstract

A cascade type liquefaction process for precooling coalbed methane (CBM) by residual pressure of pressure swing adsorption (PSA) belongs to the technical field of chemical industry and low temperature. The invention provides an integrated process of adsorption and liquefaction of CBM with high nitrogen content. The process comprises the following steps: before liquefaction, firstly desorbing most nitrogen in the CBM by the PSA process, adopting the residual pressure of adsorption in the above nitrogen to precool the CBM after expanding the residual pressure and liquefying the CBM by the cascade type liquefaction process formed by propane, ethane and methane three-stage refrigeration cycle. The precooling process of the nitrogen with residual pressure saves the propane flow used in first-stage cooling, thus reducing the overall power consumption of the system. With the increase of the nitrogen content of the CBM and the residual pressure of adsorption in the nitrogen, the temperature of the precooled CBM can be lower than that of the precooled original propane, therefore, the precooled CBM can be directly led into heat exchangers to which the ethane provides cooling capacity, and the ethane consumption can be saved, thus further reducing the power consumption.

Description

technical field [0001] The invention relates to a coalbed gas liquefaction process, in particular to a coalbed gas cascaded liquefaction process which utilizes pressure swing adsorption residual pressure precooling and relates to high nitrogen content coalbed gas. It belongs to the field of chemical industry and low temperature technology. Background technique [0002] Coal bed methane is a kind of coal mine associated gas with methane as the main component, commonly known as "coal mine gas", which belongs to unconventional natural gas. The development and utilization of coalbed methane can not only provide a clean energy with high calorific value, but also prevent mine disasters caused by gas explosions and reduce the emission of methane, a greenhouse gas, which is of great significance to coal mine safety and environmental protection. my country's coalbed methane reserves are abundant, and they are mainly distributed in the economically developed or relatively developed c...

Claims

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Application Information

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IPC IPC(8): F25J3/00B01D53/047
CPCY02P20/10
Inventor 林文胜高婷顾安忠
Owner SHANGHAI JIAO TONG UNIV
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