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Method for power generation through coal underground gasified product gas

A technology for underground gasification and product gas, applied in coal gasification, underground mining, combustible gas purification, etc., can solve problems such as lack of process plan, and achieve the effect of reducing costs, increasing production and sales revenue

Inactive Publication Date: 2017-08-04
ZHONGWEI SHANGHAI ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] c) Lack of process plan for downstream synthesis gas and by-product coal tar power generation of underground coal gasification process

Method used

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  • Method for power generation through coal underground gasified product gas
  • Method for power generation through coal underground gasified product gas
  • Method for power generation through coal underground gasified product gas

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Embodiment Construction

[0039] The technical solutions of the present invention will be further specifically described below through specific embodiments and in conjunction with the accompanying drawings.

[0040] In one embodiment, underground coal gasification product gas is used to generate electricity. For coal seams with high calorific value (LHV>24MJ / kg) with ultra-low sulfur content, chlorine content, phosphorus content and heavy metal content, dry syngas7 can be directly used for power generation without additional treatment ( figure 1 ). The process can use air gasification, oxygen-enriched gasification or pure oxygen gasification. The synthetic gas produced by air gasification has a low calorific value, 4-6MJ / Nm3 ; The synthetic gas produced by pure oxygen oxidation has a high calorific value, 10-12MJ / Nm 3 . The main difference is the inert component N in the synthesis gas 2 The content of N in air gasification syngas 2 The content can be as high as 50mole%, and the N in the pure oxyge...

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Abstract

The invention relates to a method for power generation through coal underground gasified product gas. The method comprises the following steps that (1) a plurality of underground gasification furnaces or gasification furnace groups produce crude synthesis gas with a proper economic scale through the processes of air gasification, oxygen-enriched gasification or pure oxygen gasification; (2) the crude synthesis gas is transported to the ground through a product well and enters crude synthesis gas cooling, washing and separation units, and dry synthesis gas is obtained; and (3) the dry synthesis gas is directly transported to a combustion unit and a power generation unit mechanically coupled to the combustion unit to be subjected to gas power generation, and electric power is produced. According to the provided method for power generation through the coal underground gasified product gas, the downstream produced finished product range is expanded by fully utilizing main by-products in the coal underground gasification process, and the later-period processing cost and emission cost are reduced.

Description

technical field [0001] The invention relates to a method for generating electricity by utilizing the product gas of underground coal gasification, and belongs to the technical field of comprehensive utilization of product gas of underground coal gasification. Background technique [0002] Underground Coal Gasification (ISC) is a process of directly converting coal into product gas through the combustion and gasification reaction of underground coal seams with the help of oxidants. The product gas, often called syngas, can be used as a feedstock for downstream processes such as fuel production, chemical production, power generation, and more. This process integrates well construction and completion, underground coal mining and coal gasification technology, and has the advantages of good safety, small investment, high benefit and less pollution. [0003] Coal gasification process is the process of converting coal into syngas through a series of chemical reactions. Major resp...

Claims

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Application Information

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IPC IPC(8): E21B43/295F02B43/10F02C3/22F01D15/10C10K1/00C10K1/16C10K1/34C10L1/04
CPCC10K1/004C10K1/006C10K1/16C10K1/34C10L1/04E21B43/295F01D15/10F02B43/10F02C3/22Y02T10/30
Inventor 闵振华卡斯珀·扬·亨德利克·伯格汪原理
Owner ZHONGWEI SHANGHAI ENERGY TECH CO LTD
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