Combined system and process for producing electric-substituted natural gas based on coal gasification and methanation

A technology that replaces natural gas and coal gasification. It is applied in the direction of combustible gas purification, combustible gas chemical modification, combustible gas purification/transformation, etc. It can solve the problems of polluting the environment, coke oven gas not being effectively used, and wasting resources. Decrease in investment costs, enhance corporate competitiveness and economic benefits, and the effect of efficient and clean utilization

Active Publication Date: 2007-11-21
TSINGHUA UNIV
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Problems solved by technology

However, it still faces the following three problems: first, the economy of IGCC power plants, the cost of IGCC power plants is currently twice the cost of ordinary coal-fired power plants; second, the variable load operation capacity of IGCC power plants; Retrofitting Technology of Value Coal Gas
[0005] In addition, my country's coke production, consumption, and export volume all rank first in the world, but a large amount of coke oven gas cannot be effectively used, and it is directly emptied and burned, which not only wastes precious resources, but also seriously pollutes the environment.

Method used

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  • Combined system and process for producing electric-substituted natural gas based on coal gasification and methanation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: Based on the raw coal consumption of 5000 tons / day and the gas-steam combined cycle of Siemens V94.3a as the basis, the calculation of the overall performance of the system at base load is carried out for the embodiment.

[0032] The oxygen 3 produced by the air 1 entering the air separation device 21 is pressurized to 60-70 bar and enters the coal gasification equipment 15 together with the coal water slurry 2 with a concentration of 60-70%. The coal gasification equipment can adopt various structural forms, For example, two-stage, four-nozzle opposed type or Texaco type, etc., the gasification pressure is 55-65bar, the temperature is 1300-1500℃, and the crude gasification gas produced is recovered by sensible heat to produce high-pressure steam of 80-140bar5 Send it to the gas-steam combined cycle device 20; the crude gasified gas 4 after cooling is 150-400 ° C, and enters the carbon monoxide sulfur-resistant shift reactor 16 to undergo a shift reaction. Th...

Embodiment 2

[0035] Example 2: Taking the situation where gasification gas 6 and coke oven gas 14 are directly mixed to adjust the hydrogen-carbon ratio to 3:1 as an example, so as to reduce the load of the carbon monoxide sulfur-tolerant shift reactor for shift reaction, other organizational forms of the process flow And processing parameters are defined as embodiment 1. In Example 2, the raw material consumption and overall system performance are calculated based on the product output calculated in Example 1.

[0036] The coke oven gas composition and lower calorific value used in Example 2 are shown in Table 2.

[0037] H 2

CH 4

CO

CO 2

N 2

O 2

h 2 o

C m h n

LHV(MJ / kg)

58.10

24.90

5.86

2.35

3.90

0.39

2.35

2.15

37.9

[0038] Through calculation, the overall performance of the system and process method of the present invention in Embodiment 1 and Embodiment 2 is sho...

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PUM

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Abstract

An electric-substituting natural gas combined system and process based on coal gasification and methanation are disclosed. The process is carried out by delivering oxygen, powdered coal or water-gas slurry into gasified apparatus, recovering for crude gasified gas by wet heat, delivering into sulfur-resisting carbon monoxide carbon reactor, adjusting hydrogen-carbon ratio, entering into desulfurizing decarbonizer, recovering elementary sulfur while enriching carbon dioxide, delivering synthetic gas into methane reactor to generate substituted natural gas as domestic gas partially, entering into gas and steam combined circulator partially, and entering into substituted natural gas storage tank partially. It integrates coal gasified, methanation and gas steam combined circulation together, it's efficient and clean, has better utilizing rate, no CO2 discharge and need for changing gas turbine or load.

Description

technical field [0001] The present invention mainly relates to a novel electricity-replacing natural gas cogeneration system and process method, in particular to a cogeneration system and process method based on coal gasification and methanation. Coke oven gas utilization method. Background technique [0002] Coal gasification is the most important core technology and key equipment in the chemical system based on coal. The energy and chemical system based on it can not only better solve the problems of efficiency and pollutant discharge in the coal conversion process, but also produce Energy products such as liquid fuel and electricity are of great significance to solving the comprehensive utilization of coal resources and alleviating the shortage of oil and gas resources in China. [0003] The traditional application of methanation as a purification technology is: (1) for the removal of process gases (such as refining H 2 or ammonia synthesis gas) in a small amount of CO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/46C10J3/86C10K1/00C10K3/00F22B33/18
CPCY02E20/16Y02E20/18
Inventor 李政王明华
Owner TSINGHUA UNIV
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