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Method for preparing sng by cryogenic separation of coke oven gas

A technology of cryogenic separation and coke oven gas, which is applied in the field of natural gas production, can solve the problems of large initial investment, many system components, and high maintenance costs, and achieve the effect of reducing investment costs, small volume of cold box, and easy maintenance

Active Publication Date: 2017-11-07
LIAONING CIMC HASHENLENG GAS LIQUEFACTION EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It fundamentally solves the problems of complex operation, many system components, large floor area, high maintenance cost, and large initial investment of existing SNG production equipment.

Method used

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  • Method for preparing sng by cryogenic separation of coke oven gas
  • Method for preparing sng by cryogenic separation of coke oven gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The coke oven gas cryogenic separation system for preparing synthetic natural gas includes compressor I 1, compressor II 14, main heat exchanger 8, high-pressure dehydrogenation distillation tower 2, low-pressure denitrogenation distillation tower 3, dehydrogenation tower overhead condensation 4, denitrification tower top condenser 6, subcooler 9, dehydrogenation tower reflux liquid separation tank 5, denitrification tower reflux liquid separation tank 7 and other parts. Wherein, the dehydrogenation tower reflux liquid separation tank 5 is located in the dehydrogenation tower top condenser 4 , and the denitrification tower reflux liquid separation tank 7 is located in the denitrification tower top condenser 6 . A denitrification tower reboiler 10 is provided at the bottom of the low-pressure denitrification rectification tower, and the feed gas pipeline is connected to the feed end of the denitrification tower reboiler 10 after passing through the main heat exchanger 8, ...

Embodiment 2

[0041] The nitrogen cooling source was replaced by nitrogen-methane gas mixture with a molar content of 40% to 90%, and the others were the same as in Example 1.

[0042] The pressure involved in the manual refers to the gauge pressure (G) unless otherwise specified.

[0043] The denitrification equipment involved in the specification (denitrification rectification tower, denitrification tower top condenser, denitrification tower reboiler, denitrification tower reflux liquid separation tank) also removes a small amount of carbon monoxide while denitrification, However, since carbon monoxide is not the main impurity to be considered, it is not described in detail for the sake of brevity.

[0044] The raw material gas mentioned in the description may be methanated coke oven gas or unmethanated coke oven gas. In order to save energy consumption, it is best to use a nitrogen-methane compressor for coke oven gas that is not methanated.

[0045] In the embodiment, when the molar c...

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Abstract

A simple and practical method for producing SNG by cryogenic separation of coke oven gas. Its equipment includes nitrogen compressor or nitrogen-methane compressor, high-pressure dehydrogenation rectification tower, low-pressure denitrogenation rectification tower, dehydrogenation tower top condenser, dehydrogenation tower reflux liquid separation tank, denitrification tower top condenser, Denitrification tower reflux separation tank, main heat exchanger, subcooler, denitrification tower reboiler. The nitrogen or nitrogen-methane gas feed pipe of the main heat exchanger is connected to the discharge pipe of the nitrogen compressor or the nitrogen-methane compressor, and the nitrogen or nitrogen-methane gas discharge of the main heat exchanger is The tube is connected to the feed tube of the nitrogen compressor or the nitrogen-methane compressor. The present invention only uses a nitrogen compressor or a nitrogen methane compressor to produce cooling capacity in a circulating refrigeration method. The method has the advantages of simple flow structure, low energy consumption and low cost.

Description

technical field [0001] The invention relates to the field of natural gas production, in particular to a method for producing SNG through cryogenic separation of coke oven gas. Background technique [0002] Coal-to-natural gas usually refers to the use of mined raw coal to produce synthetic natural gas (Synthetic Natural Gas, hereinafter referred to as SNG) through a gasification process. In practice, the industry often regards underground coal gasification (also known as Underground Coal Gasification, UCG) as a type of coal-to-natural gas. [0003] During the "Eleventh Five-Year Plan" period, with the implementation of the Chinese government's policies on energy conservation, emission reduction and comprehensive utilization of resources, the utilization of coke oven gas began to shift to the production of SNG. Due to the small scale of a single project, it is impossible to build a pipeline network for the coke oven gas to SNG project. Therefore, the products generally adopt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/02F25J5/00
CPCF25J3/0252F25J3/0223F25J3/0233F25J3/0257F25J2200/40F25J2200/74F25J2210/14F25J2270/12F25J2270/42F25J2270/66
Inventor 赵德泉石丽华
Owner LIAONING CIMC HASHENLENG GAS LIQUEFACTION EQUIP CO LTD