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Method for manufacturing natural gas by utilizing low-rank coal

A low-rank coal and natural gas technology, applied in the field of natural gas preparation, can solve the problems of immature process technology, high raw material gas requirements, and high operating costs, and achieve the effects of easy grid-connected transportation, reduced impurity content, and low operating costs

Active Publication Date: 2013-08-07
SEDIN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These technologies have the advantages of good heat transfer ability, uniform bed temperature, and online replacement of catalysts, etc., but the conversion rate is low and the requirements for raw gas are high.
CN201110083965.8 adopts direct hydrogenation of coal to catalyze the production of natural gas, and the process flow is simplified, but the operating cost is high and the process technology is not mature enough, which needs further research
The reactor structure and reactor type of the above-mentioned main study of methanation, the process flow is coal as raw material, through gasification, cooling transformation (hot), purification (cold), methanation (hot) and cooling and drying (cold) process, which is an alternating pattern of "hot-cold-hot-cold", resulting in severe heat loss

Method used

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  • Method for manufacturing natural gas by utilizing low-rank coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Using lignite as raw material, pressurized gasification of crushed coal (gasification pressure 4.0MPa, gasification temperature 1050°C, gasification agent is water vapor, CO 2 and oxygen in accordance with water vapor: CO 2 : Oxygen=7kg: 1Nm 3 : 1Nm 3 Composition of multi-component mixed gasification agent), the composition of the produced gas is (V%):

[0047] h 2 : 37.88, CO: 20.25, CH 4 : 10.65, CO 2 : 30.25, H 2 S: 0.22, N 2 : 0.75

[0048] 27.52% of the above gas is subjected to sulfur-resistant transformation (transformation pressure is 3.85MPa, transformation temperature is 220-385°C, space velocity is 3500h -1 , the catalyst is the QCS-04 sulfur-resistant shift catalyst produced by Keli Chemical Company of Qilu Petrochemical Research Institute in China), which is mixed with the unshifted gas passing through the auxiliary line to obtain the gas composition (V%):

[0049] h 2 : 42.50, CO: 13.90, CH 4 : 8.80, CO 2 : 33.90, H 2 S: 0.20, N 2 : 0.70

[...

Embodiment 2

[0054] The long-flame coal is used as raw material to gasify crushed coal under pressure (gasification pressure is 3.0MPa, gasification temperature is 1020°C, gasification agent is water vapor, CO 2 and oxygen in accordance with water vapor: CO 2 : Oxygen=6kg: 2Nm 3 : 1Nm 3 Composition of multi-component mixed gasification agent), the composition of the produced gas is (V%):

[0055] h 2 : 38.77, CO: 20.68, CH 4 : 9.79, CO 2 : 30.06, H 2 S: 0.25, N 2 : 0.45

[0056] 29.89% of the above gas is subjected to sulfur-resistant transformation (transformation pressure is 2.85MPa, transformation temperature is 255-385°C, space velocity is 5300h -1 , the catalyst is a sulfur-resistant shift catalyst with high hydrolysis function disclosed in Chinese patent 200410008740.6), mixed with the unshifted gas passing through the auxiliary line to obtain the gas composition (V%):

[0057] h 2 : 42.30, CO: 13.60, CH 4 : 9.20, CO 2 : 34.10, H 2 S: 0.20, N 2 : 0.40

[0058] The abov...

Embodiment 3

[0062] The long-flame coal is used as raw material to gasify crushed coal under pressure (gasification pressure is 6.0MPa, gasification temperature is 1250°C, gasification agent is water vapor, CO 2 and oxygen in accordance with water vapor: CO 2 : Oxygen=3kg: 4Nm 3 : 1Nm 3 Composition of multi-component mixed gasification agent), the composition of the produced gas is (V%):

[0063] h 2 : 33.61, CO: 32.25, CH 4 : 8.69, CO 2 : 24.64, H 2 S: 0.15, N 2 : 1.16

[0064] 58.00% of the above gas is subjected to sulfur-resistant transformation (transformation pressure is 5.85MPa, transformation temperature is 285-480°C, space velocity is 7100h -1 , the catalyst is the QDB series sulfur-resistant shift catalyst produced by Qingdao Lianxin Chemical Industry Co., Ltd.), mixed with the unshifted gas passing through the auxiliary line to obtain the gas composition (V%):

[0065] h 2 : 43.02, CO: 12.48, CH 4 : 6.90, CO 2 : 36.50, H 2 S: 0.10, N 2 : 1.00

[0066] The above-me...

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Abstract

The invention relates to a method for manufacturing natural gas by utilizing low-rank coal. The method comprises the following steps of charging multielement gasifying agent consisting of oxygen, steam and carbon dioxide into a crushed-coal pressurized gasification furnace to gasify the low-rank coal to produce raw gas and obtain the raw gas containing methane gas; charging a part of raw gas into a furnace filled with cobalt-molybdenum sulfur-resistant oil-resistant catalyst to carry out a CO conversion reaction, combining the other part of raw gas with the gas subjected to the CO conversion reaction through a sub-line so that the molar ratio of H2 to CO is within 3.05-3.45 and meets the requirement of a raw material gas for synthesizing the methane; synthesizing the methane in a methanation device filled with a MoSi2 sulfur-resistant catalyst by utilizing the conversed gas; and enabling the methanated mixed gas to pass through cool, dehydrated and deacidified gas to obtain products with high natural gas product quality standard ruled in the national standard GB-17820-1999. The method disclosed by the invention has the advantages of high efficiency, energy conservation and environment protection.

Description

technical field [0001] The invention belongs to a method for preparing natural gas, in particular to a method for preparing natural gas from low-rank coal. Background technique [0002] Natural gas is recognized as clean energy. Due to its convenient transportation and use, the consumption of natural gas is increasing, but natural gas resources are becoming less and less. Literature: In the analysis of the process flow and economics of coal-to-natural gas, it is mentioned that my country's demand for natural gas will reach 120 billion m3 in 2010, 2015 and 2020 respectively 3 , 170 billion m 3 and 200 billion m 3 , correspondingly the natural gas gap is 30 billion m 3 , 65 billion m 3 and 100 billion m 3 . At present, the way to effectively make up for the gap in natural gas resources in my country is to use my country's relatively abundant low-quality coal as raw material to produce synthetic natural gas (or substitute natural gas) through gasification, cooling shift, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08
Inventor 张庆庚左永飞崔晓曦杨伟李晓
Owner SEDIN ENG
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