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Process performing methanation on gas synthesized by coal to synthesize substitute natural gas

A technology for replacing natural gas and coal to syngas, which is applied in the petroleum industry, gas fuel, fuel and other directions to achieve the effects of reducing reaction energy consumption, reducing reactor load, and avoiding sintering deactivation

Active Publication Date: 2016-12-07
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology does not solve the problem of high bed temperature caused by exothermic reaction, and the outlet temperature of reactors 1-3 reaches 773-779°C

Method used

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  • Process performing methanation on gas synthesized by coal to synthesize substitute natural gas
  • Process performing methanation on gas synthesized by coal to synthesize substitute natural gas
  • Process performing methanation on gas synthesized by coal to synthesize substitute natural gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The catalysts for reactors R1 and R2 are first prepared. The preparation process is as follows: prepare a nickel nitrate solution with a cation concentration of 0.5 g / ml, and add 10-40 mesh γ-Al 2 o 3 The carrier powder is impregnated for 12 hours under stirring conditions. After the impregnation, the suspension is heated and concentrated in a water bath at 60°C, then calcined at 550°C for 6 hours, and ground to 10-40 mesh after calcining. The catalyst preparation steps used in reactors R2, R3, R4, and R5 are the same as above, and the specific parameters are shown in Attached Table 1 and Attached Table 2.

[0040] The catalyst and quartz sand are mixed and loaded. The mass ratio of catalyst to quartz sand in reactors R1 and R2 is 1:0.8, and the ratio of catalyst to quartz sand in reactor R3 is 1:0.5. Reactors R4 and R5 are filled with catalyst only.

[0041] The metal active components in the loaded catalyst are in an oxidized state and need to be pre-reduced after...

Embodiment 2-11

[0045] On the basis of Example 1, the ratio of height to diameter of the reactor catalyst bed, space velocity, reaction pressure, hydrogen-to-carbon ratio of synthesis gas, distribution ratio of synthesis gas, reactor inlet temperature, synthesis gas and water vapor in Examples 2-11 The molar ratio, reactor outlet temperature, catalyst active component type, active component content, catalyst and quartz sand mass ratio factors have been adjusted. The specific data and results are shown in Attached Table 1, and the catalyst preparation conditions used in the reaction are shown in Attached Table 2 , see attached table 3 for composition of feed gas and product gas, see attached table 4 for reduction conditions. All the other are with embodiment 1.

[0046]

[0047]

[0048]

[0049] Schedule 3

[0050]

[0051] Schedule 4

[0052]

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PUM

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Abstract

The invention relates to a process performing methanation on gas synthesized by coal to synthesize substitute natural gas. The process is characterized in that catalysts are loaded into methanation reactors R1, R2, R3, R4 and R5, reduction pretreatment is performed, and the methanation reaction is performed by parallelly connecting the reactors R1 and R2 and then serially connecting the reactors R1 and R2 with the reactors R3, R4 and R5 to obtain the substitute natural gas. The process has the advantages that the temperature of the methanation reactors is controlled effectively, the process does not need gas circulation, and power consumption and corresponding energy consumption of the reaction process are lowered greatly.

Description

technical field [0001] The invention belongs to a process for synthesizing coal-based synthesis gas through methanation to synthesize substitute natural gas. Background technique [0002] Methane is an important fuel and chemical intermediate, which can be used in the synthesis of various compounds such as ethylene, acetylene, and formaldehyde. In recent years, with the rapid increase in the demand for natural gas in my country, the gap between the supply and demand of domestic natural gas resources has gradually increased. Using coal-to-synthesis gas as raw material and producing substitute natural gas through methanation reaction is an effective way to improve domestic natural gas supply. Methanation is the core technology of coal-to-natural gas, the reaction refers to CO or CO 2 Synthesis of CH by hydrogenation under the action of catalyst 4 and H 2 O, the reaction formula is as follows: [0003] CO+3H 2 =CH 4 +H 2 O+206KJ / mol (1) [0004] CO 2 +4H 2 =CH 4 +2H...

Claims

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Application Information

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IPC IPC(8): C10L3/08
CPCC10L3/08
Inventor 吉可明刘平张侃荀家瑶田艳青
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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