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System and method for precooling, drying and purifying coal-based natural gas

A technology of coal-to-natural gas and natural gas, which is applied in the field of coal-to-natural gas drying and purification treatment, and can solve the problems of large-flow gas investment and high operating costs

Active Publication Date: 2015-06-03
SHANGHAI YAOXING INVESTMENT MANAGEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The solid adsorption dehydration process has relatively high investment and operating costs for large-flow gas, and this process is only suitable for low-pressure natural gas treatment with small flow

Method used

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  • System and method for precooling, drying and purifying coal-based natural gas
  • System and method for precooling, drying and purifying coal-based natural gas

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specific Embodiment

[0053] According to the second aspect of the present invention, the present invention also proposes a method for precooling, drying and purifying coal-based natural gas by using the aforementioned system for pre-cooling, drying and purifying coal-based natural gas. According to a specific embodiment of the present invention, the method includes: performing a first cooling treatment on the coal-based natural gas in a precooler to obtain a first cooled natural gas; performing a gas-liquid treatment on the first cooled natural gas in a gas-liquid separator. Separation, so as to separate the water vapor condensate; in the cooler, the first cooled natural gas that has undergone the gas-liquid separation is subjected to a second cooling treatment to obtain a second cooled natural gas; in the scrubber, the second cooled natural gas is dried and purification treatment, so as to obtain purified methane; wherein, the second cooled natural gas is dried and purified using the methanol wash...

Embodiment

[0061] The normal temperature methane gas (coal-to-natural gas) from the methane synthesis of the coal-to-natural gas plant has a temperature of about 35-45°C, which contains water vapor saturated under pressure and a lot of carbon dioxide. A typical composition is as follows:

[0062] Composition of coal-based natural gas:

[0063]

[0064] The above normal temperature coal-based natural gas (methane gas) first enters the pre-cooler, exchanges heat with the cold stream to about 3-8 degrees Celsius, and separates the condensed water condensate in it; then sprays methanol into the methane gas before the cooler to continue and The cold stream exchanges heat, lowers the temperature to -20 to -40 degrees Celsius, and enters the bottom of the methane gas scrubber.

[0065] The methane gas is in countercurrent contact with the low-temperature methanol lean liquid in the methane gas scrubber, and the low-temperature methanol lean liquid enters from the top of the methane gas scrubb...

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Abstract

The invention provides a system and method for precooling, drying and purifying coal-based natural gas. The system comprises a precooler, a gas-liquid separator, a cooler and a washing tower, wherein a separator inlet of the gas-liquid separator is connected with a first cooling natural gas outlet of the precooler; a first cooling natural gas inlet of the precooler is connected with a separator outlet of the gas-liquid separator; a second cooling natural gas inlet of the washing tower is connected with a second natural gas outlet of the cooler, wherein a methanol washing liquid inlet of the washing tower is connected with a low-temperature methanol washing device in a purified synthesized gas system, and a methanol washed liquid outlet of the washing outlet is connected with the low-temperature methanol absorption tower in the purified synthesized gas system, so that the system for drying and purifying the second cooling natural gas in the washing tower in advance and returning the synthesized gas by utilizing low-temperature methanol produced by the low-temperature methanol washing device is facilitated for purification of synthesized gas.

Description

technical field [0001] The invention belongs to the field of drying and purification treatment of coal-based natural gas, in particular, the invention relates to a system and method for pre-cooling and drying and purification of coal-based natural gas. Background technique [0002] The main component of coal-based natural gas is methane, so it is also called methane gas. The product of methanation (methane synthesis) of coal-to-natural gas equipment is coal-to-natural gas (methane gas) containing saturated water at about 40°C. It must be dehydrated, dried and purified before entering pipeline natural gas long-distance pipelines or methane liquefaction to produce LNG. The commonly used methods are cold separation method, solid adsorption method and solvent absorption method. [0003] The cold separation method uses pressure changes to cause temperature changes to condense water vapor from the gas phase. There are two commonly used processes: throttling expansion cooling pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 陆欢庆周怀祖李杰王宗良周琦刘红艳杨守青孙永才张滋生李锟李冬阳吴龙刘斌
Owner SHANGHAI YAOXING INVESTMENT MANAGEMENT