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Adiabatic methanation process and device for preparing synthetic natural gas

A technology for synthesizing natural gas and methanation, applied in the field of adiabatic methanation processes and devices, can solve the problems of decreased heat utilization efficiency, harsh operating conditions, and reduced high-grade heat recovery, so as to reduce purification investment and operating costs, and avoid metal powder. The effect of reducing corrosion and improving the quality of synthetic natural gas

Active Publication Date: 2010-05-12
SHANGHAI INT ENG CONSULTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] 1. The existing methanation process is complex, with a large number of methanation reactors and heat exchange equipment;
[0023] 2. The circulation volume is large, the circulation energy consumption is high, and it is difficult to enlarge a single set;
[0024] 3. At present, the methanation process of high-temperature gas circulation is adopted, and the design and manufacture of the circulation compressor is difficult, the operating conditions are harsh, and the investment is large; while the methanation process of cold gas circulation is used, the recovery of high-grade heat is reduced, and the steam production is reduced (saturated or superheated) , the heat utilization efficiency decreases

Method used

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  • Adiabatic methanation process and device for preparing synthetic natural gas
  • Adiabatic methanation process and device for preparing synthetic natural gas
  • Adiabatic methanation process and device for preparing synthetic natural gas

Examples

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Comparison scheme
Effect test

Embodiment 1

[0075] see figure 1 , an adiabatic methanation unit for producing synthetic natural gas, including a guard bed GB, a methanation unit 100 , a methanation refining unit 200 , a methanation heat recovery steam generation unit, and a condensate treatment unit 300 . The methanation unit includes the first adiabatic methanation reactor M1, the first adiabatic methanation reactor M2, the first heat recovery system WH1, the second heat recovery system WH2, the first cycle compressor C1; the methanation heat recovery steam production unit It includes the fourth heat recovery system WH4, the first gas-liquid separation tank 1, the second cycle compressor C2, the condenser CW, the second gas-liquid separation tank 2, the dryer 3, and the third cycle compressor C3. The methanation refining unit 200 includes a third adiabatic methanation reactor M3 and a third heat recovery system WH3.

[0076] The crude gas is regulated by transformation (H 2 -CO 2) / (CO+CO 2 ) is slightly greater tha...

Embodiment 2

[0087] see figure 2 , an adiabatic methanation unit for producing synthetic natural gas, including a guard bed GB, a methanation unit 100 , a methanation refining unit 200 , a methanation heat recovery steam generation unit and a condensate treatment unit 300 . The methanation unit includes the first adiabatic methanation reactor M1, the first adiabatic methanation reactor M2, the first heat recovery system WH1, the second heat recovery system WH2, the first cycle compressor C1; the methanation heat recovery steam production unit It includes a first gas-liquid separation tank 1, a second circulation compressor C2, a condenser CW, a second gas-liquid separation tank 2, a dryer 3, and a third circulation compressor C3. The methanation refining unit 200 includes an isothermal methanation reactor M5 and a third heat recovery system WH3.

[0088] The fresh synthesis gas coming out of the outlet of the guard bed GB is divided into two paths, the first part of the fresh synthesis g...

Embodiment 3

[0098] see image 3 , an adiabatic methanation unit for producing synthetic natural gas, including a guard bed GB, a methanation unit 100, a methanation refining unit 200, a methanation heat recovery steam generation unit, and a condensate treatment unit 300. The methanation unit includes a first adiabatic methanation unit Reactor M1, the first adiabatic methanation reactor M2, the first heat recovery system WH1, the second heat recovery system WH2, the first cycle compressor C1; the methanation heat recovery steam production device includes the first gas-liquid separation tank 1, Second cycle compressor C2, condenser CW, second gas-liquid separation tank 2, drier 3, third cycle compressor C3. The methanation refining unit 200 includes a third adiabatic methanation reactor M3, a fourth adiabatic methanation reactor Reactor M4, third heat recovery unit WH3, fourth heat recovery unit WH4.

[0099] The fresh synthesis gas coming out of the outlet of the guard bed GB is divided i...

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Abstract

The invention discloses an adiabatic methanation process for preparing synthetic natural gas, which comprises the following steps of: carrying out methanation; carrying out methanation heat recovery to prepare steam; and processing a condensate, wherein purified synthesis gas enters the methanation step to carry out methanation. The process is characterized in that: the methanation step adopts atleast one adiabatic methanation reactor to carry out methanation and also comprises a methanation refining step; and the methanation refining step is arranged between the methanation step and the step of methanation heat recovery to prepare the steam or arranged in the step of the methanation heat recovery to prepare the steam. The invention also discloses an adiabatic methanation device used foran isothermal methanation process for preparing the synthetic natural gas. The process and the device have the advantages of energy saving, environmental protection and less investment.

Description

technical field [0001] The present invention relates to the chemical industry field of producing synthetic natural gas (SNG) by using coal or biomass as raw material, in particular to the production of synthetic natural gas (substitute / synthetic natural gas, SNG) by using coal (coal) or biomass (biomass) as raw material Isothermal Methanation Process and Plant (SIECC / IMP). Background technique [0002] The current status quo of my country's energy structure is more coal, less gas, and oil shortage, and it will be difficult to change in the future. At present, the use of coal is mainly used as fuel directly, and the utilization efficiency is low; and during the combustion of coal, a large amount of waste gas, waste residue and other harmful substances are emitted, polluting the air, waters and land, and carbon—coal used in the chemical industry is all It is transported by railway and ship, and the transportation load is heavy, which occupies a large amount of transportation r...

Claims

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Application Information

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IPC IPC(8): C10L3/08
Inventor 杨震东陆欢庆刘敬荣金力强
Owner SHANGHAI INT ENG CONSULTING
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