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A process for producing natural gas from synthetic gas

A synthesis gas and natural gas technology, which is applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of high energy consumption and large circulating gas volume of the circulating gas compressor, so as to reduce the total energy consumption, reduce the circulating gas volume, and control the reaction temperature rise Effect

Active Publication Date: 2020-11-06
WISON ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the methanation reaction is a strong exothermic reaction, in order to effectively control the reaction temperature rise of the first-stage methanation and / or the second-stage methanation reactor, the existing product gas circulation process has the problem that the circulating gas volume is too large and the circulating gas is compressed The problem of high energy consumption

Method used

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  • A process for producing natural gas from synthetic gas
  • A process for producing natural gas from synthetic gas
  • A process for producing natural gas from synthetic gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] When the four-stage methanation reaction is adopted, that is, N=4, M=1, a process for producing natural gas from synthesis gas, the process flow is as follows figure 2 shown, including the following steps:

[0037] Feed amount of raw material synthesis gas 1 is 449kNm 3 / h, temperature 40°C, pressure 3.4MPaG, volume percent composition: H 2 : 46.22, CO: 14.28, CO 2 : 38.40, CH 4 : 0.00, N 2 : 0.23, H 2 S: 0.87.

[0038] The raw material synthesis gas 1 is desulfurized by a desulfurization unit 12 to remove H 2 S and other sulfur-containing components to obtain desulfurized gas 19 with a total sulfur content of <0.1ppm, and the removed sulfur-containing gas 24 is sent outside the boundary area;

[0039] The obtained desulfurized gas 19 enters the preheater 15 for preheating, and the preheated gas is divided into two streams, the first stream of desulfurized gas 20 and the recycle gas from the outlet of the recycle gas compressor 11 and the recycle gas from the de...

Embodiment 2

[0057] When the four-stage methanation reaction is adopted, that is, N=4, M=2, a process for producing natural gas from synthesis gas, the process flow is as follows Figure 4 shown, including the following steps:

[0058] Feed amount of raw material synthesis gas 1 315kNm 3 / h, temperature 40°C, pressure 3.65MPaG, volume percent composition: H 2 : 40.31, CO: 12.06, CO 2 : 33.92, CH 4 : 12.69, N 2 : 0.23, H 2 S: 0.78.

[0059] The raw material synthesis gas 1 is desulfurized by a desulfurization unit 12 to remove H 2 S and other sulfur-containing components to obtain desulfurized gas 19 with a total sulfur content of <0.1ppm, and the removed sulfur-containing gas 24 is sent outside the boundary area.

[0060] The resulting sweetened gas 19 is the same as that from deCO 2 After the methane desorption gas 14 of the device 13 is mixed, it enters the preheater 15 for preheating. The preheated gas is divided into two streams. The temperature of the gas reaches 320°C, and e...

Embodiment 3

[0078] Adopt the same processing device and feed gas as embodiment 1, its flow process is as follows figure 2 As shown, the difference is:

[0079] (1) The flow ratio of the first stream of desulfurized gas 20 and desulfurized gas 19 is 0.2;

[0080] (2) The ratio of the second product gas 23a flow to the sum of the first product gas 22a and the second product gas 23a flow is 0.1;

[0081] (3) The material inlet temperature of the first methanation reactor is 250°C, the material inlet temperature of the second methanation reactor is 190°C, the material inlet temperature of the third methanation reactor is 200°C, and the fourth methanation reactor The material inlet temperature of the device was 190°C.

[0082] After testing, the circulating gas volume of the circulating gas compressor 11 is about 10.6kNm 3 / h, the required compression work is about 52kW.

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Abstract

The invention relates to a technology for preparing natural gas from synthesis gas. Sulfur-containing components in raw synthesis gas are removed firstly, desulfurized gas containing CO2 enters a methanation device and is subjected to a methanation reaction, and coarse SNG (synthetic natural gas) product gas is obtained; CO2 in the coarse SNG product gas is removed, a qualified SNG product is prepared, and methane-rich gas obtained in the CO2 removing process returns to the methanation reactor and is utilized as diluent gas to control the reaction temperature rise of the methanation reactor. Compared with the prior art, not only is the reaction temperature rise of the methanation reactor controlled, but also circulating gas flow rate of a circulating gas compressor can be greatly reduced,so that system energy consumption and equipment investment are remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of synthetic natural gas, in particular to a process for producing natural gas from synthetic gas. Background technique [0002] Natural gas is a clean energy with safe use and high calorific value. It is widely used in power generation, chemical industry, city gas, automobile fuel and other industries. It is one of the main clean energy sources in the world. At present, under the situation of tight domestic natural gas supply and rising natural gas prices, many domestic companies are turning their attention to coal-to-natural gas projects. my country's energy structure is "lack of oil, less gas, rich in coal", and coal resources are relatively abundant. Therefore, according to the characteristics of my country's energy structure, actively developing coal-based synthetic natural gas (SNG) can not only meet the growing domestic market demand, but also have great significance for ensuring my country's energy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08
CPCC10L3/08
Inventor 宫万福闫兵海吕建宁侯宁圭多·科洛迪
Owner WISON ENG
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