Process for co-producing LNG (Liquefied Natural Gas) by using pyrolysis gas generated in power generation system

A power generation system and pyrolysis gas technology, applied in the field of coal chemical industry, to achieve the effect of flexible raw material and product scheme and high product benefit

Inactive Publication Date: 2014-07-30
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there is no low-rank coal pyrolysis gasification technology for power generation and polygeneration of LNG in China

Method used

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  • Process for co-producing LNG (Liquefied Natural Gas) by using pyrolysis gas generated in power generation system
  • Process for co-producing LNG (Liquefied Natural Gas) by using pyrolysis gas generated in power generation system
  • Process for co-producing LNG (Liquefied Natural Gas) by using pyrolysis gas generated in power generation system

Examples

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Effect test

Embodiment 1

[0057] In the power system, bituminous coal is used to generate electricity, and a circulating fluidized bed is used to co-produce pyrolysis gas, wherein the main composition (vol%) of pyrolysis gas is: H 2 : 33.23, CH 4 : 28.7, CO: 16.11, CO 2 : 13.09, C n h m : 6.54, N 2 : 2.22, O 2 : 0.1. Air volume 30000Nm 3 / h at a temperature of 40°C.

[0058] The specific steps for producing LNG are: using Roots blower or centrifugal blower to pressurize the pyrolysis gas to 0.005-0.01MPa(G). The dry purification temperature swing adsorption method is used to remove macromolecular impurities such as tar, naphthalene, benzene, and dust in the pyrolysis gas, and the rough purified pyrolysis gas is obtained. Then use a reciprocating compressor or a centrifugal compressor to pressurize the pre-purified gas to about 5.0MPa. The semi-coke and separated hot ash produced after the pyrolysis and gasification of raw coal are directly sent to the boiler for combustion to generate electric...

Embodiment 2

[0064] Using lignite, adopting solid heat carrier pyrolysis upgrading process, the main composition (vol%) of pyrolysis gas is: H 2 : 22.16, CH 4 : 23.90, CO: 13.73, CO 2 : 27.98, C n h m : 7.64, N 2 : 4.02, O 2 : 0.57. Air volume 30000Nm 3 / h, temperature 40°C.

[0065] The LNG production process is as follows: using a Roots blower or a centrifugal blower to pressurize the pyrolysis gas to 0.005-0.01MPa(G). The dry purification temperature swing adsorption method is used to remove tar, naphthalene, benzene and dust and other macromolecular impurities in the pyrolysis tail gas to obtain a rough purified pyrolysis gas. Use a reciprocating compressor or a centrifugal compressor to pressurize the pre-purified gas to about 2.5MPa. The semi-coke and separated hot ash produced after the pyrolysis and gasification of raw coal are directly sent to the boiler for combustion to generate electricity. The circulating fluidized bed boiler and the extraction condensing turbine gene...

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Abstract

The invention discloses a process for further co-producing LNG (Liquefied Natural Gas) by using pyrolysis gas generated after low-rank coal is used for generating power in a power generation system. According to the process, semi-cokes generated by coal in a pyrolyzing furnace and separated hot ash are fed into a power generating boiler system so as to be combusted and utilized, the generated power is used for LNG in the subsequent process, raw gas and fine ash particles generated through pyrolysis enter into a separation system, and products with high additional values can be extracted from the separated tar. The process specifically comprises the following steps of pressurizing the raw gas and then entering into a pretreatment process; removing impurities such as dust, oil tar, naphthalene and H2S in the raw gas; compressing pre-purified gas and then entering into units such as a pyrolysis gas deep purification unit, a methanation unit and cryopenic separation and liquidation units, thereby preparing clean energy liquefied natural gas which is short in China. According to the invention, coal pyrolysis and gasification are organically combined with gas, chemical, electric and heat production processes on the basis that heat supply and power generation are carried out by taking semi-cokes as solid fuels, so that graded transformation and step-by-step extraction of coal as well as economic benefit maximization are realized, the energy utilization efficiency is increased, and the economical efficiencies of thermoelectricity enterprises are increased.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and relates to coal pyrolysis gasification polygeneration technology, in particular to a process for coproducing LNG by using pyrolysis gas generated in a power generation system. Background technique [0002] my country's oil-scarce, gas-scarce, and coal-rich national conditions doom its energy consumption to be dominated by coal. However, coal utilization has been in an industrial pattern that only develops coal production and does not pay attention to comprehensive utilization of coal for a long time. Coal consumption occupies a large proportion in power generation, industrial application, coking and gasification, etc., while the electric power, chemical industry and other industries have a single product structure, coupled with insufficient related technology, equipment and other facilities, resulting in low coal utilization efficiency in my country, and the unit output value ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/06
Inventor 杨宽辉张新波郑珩石江马磊
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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