A methanation process of synthetic natural gas prepared from coal

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: 2015-07-08
SOUTHWEST RES & DESIGN INST OF CHEM IND +1
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Problems solved by technology

[0003] 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

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  • A methanation process of synthetic natural gas prepared from coal

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Embodiment 1

[0026] according to figure 1 The process flow shown, 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 the syngas is H 2 64.01%, CO 20.03%, 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. The 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 10000 h -1 . The inlet temperature of the third methanation furnace is 270°C, the outlet temp...

Embodiment 2

[0028] according to figure 1 The process flow shown, the pressure is 1.5 MPa, 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 the syngas is H 2 63.43%, CO 20.03%, CO 2 1.1%, CH 4 15.15%, N 20.29%. 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 20000 h -1 . The inlet temperature of the third methanation furnace is 270°C, the outlet t...

Embodiment 3

[0030] according to figure 1 The process flow shown, 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 the syngas is H 2 65.55%, CO 20.03%, 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 15000 h -1 . The inlet temperature of the third methanation furnace is 270°C, the outlet...

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Abstract

The invention discloses a methanation process of synthetic natural gas (SNG) prepared from coal. Purified and decarbonized synthetic gas prepared from coal is divided into three parts, wherein the first part of synthetic gas enters into a first methanation reactor after being mixed with recycle air, gas at the outlet of the first methanation reactor enters into a second methanation reactor after being mixed with the second part of synthetic gas, the gas at the outlet of the second methanation reactor enters in to a third methanation reactor after being mixed with the third part of synthetic gas, after the gas is cooled in the third methanation reactor, part of the gas enters into a cyclic compressor to be boosted to be used as the recycle gas, other gases sequentially enter into a fourth methanation reactor, a fifth methanation reactor and a sixth methanation reactor to be subjected to methanation reaction, the dry basis content of methane in the gas at the outlet of the final methanation reactor is larger than 95%, and then the SNG meeting the requirement is obtained through cooling, compressing and dehydrating. The invention has the advantages of small recycle gas quantity, high energy utilization ratio and small investment.

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. 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 my country is relatively rich in coal and less in gas. As a high-quality clean energy, natural gas currently accounts for only 3.9% of my country's primary energy consumption, far below the world average of 23.7%. Over the ye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
Inventor 李泽军张新波侯建国宋鹏飞何洋高振杨宽辉张瑜郭雄王成硕易竖鹏王秀林
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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