Methanation technology for coal to synthetic natural gas

A synthetic natural gas and methanation technology, applied in the field of methanation process, can solve the problems of increasing the power consumption of circulating gas and increasing equipment investment, and achieve the effects of high energy utilization rate, small circulating gas volume and low investment

Inactive Publication Date: 2016-10-26
天津佳晟染料贸易有限公司
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  • Claims
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AI Technical Summary

Problems solved by technology

The existing coal-to-synthetic natural gas methanation technology usually uses complex devices of multiple heat exchangers and gas cyclers to control the temperature, and the cycle gas used is as high as five times, which not only increases equipment investment but also greatly increases the cycle gas consumption. power consumption

Method used

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  • Methanation technology for coal to synthetic natural gas

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Effect test

Embodiment 1

[0026] According to the process flow shown in Figure 1, the pressure is 3MPa, 100000Nm 3 / h of synthesis gas and the total sulfur in the synthesis gas is less than 0.1ppm, f=(n H2 -n CO2 ) / (n CO +n CO2 )=2.98, specifically the composition (volume fraction, dry basis) of syngas is H 2 64.01%, CO20.03%, CO 2 1.1%, CH 4 14.57%, N 2 0.29%. The synthesis gas is divided into three streams and enters the first methanation adiabatic reactor, the second methanation adiabatic reactor and the third methanation adiabatic reactor respectively, and the gas volume is 5500Nm respectively 3 / h, 19000Nm 3 / h and 75500Nm 3 / h. Circulating gas volume is 65000Nm 3 / h, the temperature entering the circulating compressor is 100°C. The inlet temperature of the first and second methanation furnaces is 250°C, the outlet temperature is 490°C, and the dry gas space velocity is 10000h -1 . The inlet temperature of the third methanation furnace is 270°C, the outlet temperature is 632°C, and t...

Embodiment 2

[0028] According to the process flow shown in Figure 1, the pressure is 1.5MPa, 100000Nm 3 / h of synthesis gas and the total sulfur in the synthesis gas is less than 0.1ppm, f=(n H2 -n CO2 ) / (n CO +n CO2 )=2.95, specifically the composition (volume fraction, dry basis) of syngas is H 2 63.43%, CO20.03%, CO 2 1.1%, CH 4 15.15%, N 2 0.29%. The synthesis gas is divided into three streams, which respectively enter the first methanation reactor, the second methanation reactor and the third methanation reactor, and the gas volume is 13000Nm respectively 3 / h, 24000Nm 3 / h and 63000Nm 3 / h. The circulating gas volume is 28000Nm 3 / h, the temperature entering the circulating compressor is 180°C. The inlet temperature of the first and second methanation furnaces are both 250°C, the outlet temperatures are 635°C and 630°C respectively, and the dry gas space velocity is 20000h -1 . The inlet temperature of the third methanation furnace is 270°C, the outlet temperature is 68...

Embodiment 3

[0030] According to the process flow shown in Figure 1, the pressure is 8MPa, 100000Nm 3 / h of synthesis gas and the total sulfur in the synthesis gas is less than 0.1ppm, f=(n H2 -n CO2 ) / (n CO +n CO2 )=3.05, specifically the composition (volume fraction, dry basis) of syngas is H 2 65.55%, CO20.03%, CO 2 1.1%, CH 4 13.03%, N 2 0.29%. The synthesis gas is divided into three streams, which respectively enter the first methanation reactor, the second methanation reactor and the third methanation reactor, and the gas volume is 9000Nm respectively 3 / h, 22000Nm 3 / h and 69000Nm 3 / h. The circulating gas volume is 58000Nm 3 / h, the temperature entering the circulating compressor is 170°C. The inlet temperature of the first and second methanation furnaces are both 250°C, the outlet temperatures are 527°C and 527°C respectively, and the dry gas space velocity is 15000h -1 . The inlet temperature of the third methanation furnace is 270°C, the outlet temperature is 637°C...

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Abstract

The invention discloses a methanation technology for coal to synthetic natural gas. The technology comprises the following steps: coal gas is divided into three flows by purified and decarburized synthetic gas, the first synthetic gas flow and circulating gas are mixed and then enter a first methanation reactor, gas from the outlet of the first methanation reactor and the second synthetic gas flow are mixed and then enter a second methanation reactor, gas from the outlet of the second methanation reactor and the third synthetic gas flow are mixed, then enter a third methanation reactor and are cooled in the third methanation reactor, one part of the gas in the third methanation reactor enters a circulating compressor and is boosted to be used as circulating gas, the remaining gas in the third methanation reactor sequentially enter a fourth methanation reactor, a fifth methanation reactor or a sixth methanation reactor to carry out a methanation reaction until the dry methane content in gas at the outlet of the last methanation reactor is greater than 95%, and the gas from the outlet of the last methanation reactor is cooled, compressed and dehydrated to obtain the required synthetic natural gas (SNG). The method has the advantages of small circulating gas volume, high energy utilization rate and investment saving.

Description

technical field [0001] The present invention relates to rich H 2 , CO and CO 2 The gas methanation process method particularly relates to a coal-to-synthetic natural gas methanation process. The present invention relates to rich H 2 , CO and CO 2 The gas methanation process method particularly relates to a coal-to-synthetic natural gas methanation process. Background technique [0002] China's estimated coal reserves are about 5.47 trillion tons, and most of them are in Shanxi Province, Inner Mongolia and Xinjiang, especially Xinjiang is located in the northwest, with poor transportation conditions. At the same time, my country's conventional natural gas resources are about 35-38 trillion Nm 3 , accounting for 2% of the world's total; of which the recoverable resources are 10-12 trillion Nm 3 , the remaining recoverable reserves of natural gas per capita are only equivalent to 6% of the world's average level, and our country is relatively rich in coal and less in gas. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
CPCC10L3/08
Inventor 王娜
Owner 天津佳晟染料贸易有限公司
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