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Technique for producing coal natural gas by utilizing crushed coal slag through gasification

A coal-to-natural gas and slag gasification technology, which is applied in combustible gas purification, combustible gas purification/transformation, condensed non-gaseous material gas purification, etc. Long process and other issues, to achieve the effect of high reliability, less auxiliary equipment, stable operation and maintenance

Active Publication Date: 2010-07-07
SEDIN ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Coal gasification technology is relatively backward, with low gasification rate, low gasification intensity, high consumption and high energy consumption
[0004] 2. The consumption of steam is large, the volume of gas water is large, the content of organic matter in gas water is large, the composition is complex, and recycling is difficult
[0005] 3. There are many impurities in crude gas, and the purification process is long and complicated

Method used

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  • Technique for producing coal natural gas by utilizing crushed coal slag through gasification
  • Technique for producing coal natural gas by utilizing crushed coal slag through gasification

Examples

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Effect test

Embodiment 1

[0097] Using lignite, gasification of crushed coal slag to produce CH 4 The crude gas contains CH 4 About 8.0%, CO52%, H 2 26%. After the raw gas is washed and cooled, and the heat is recovered by the waste heat boiler, it enters the sulfur-resistant transformation at 4.5Mpa and 175°C (saturated steam).

[0098] After all the raw gas passes through the pre-transformer, it is divided into two shares, of which about 65% of the raw gas enters the main transformer system, and is transformed under the action of the QCS-04 sulfur-resistant shift catalyst produced by the domestic Qilu Petrochemical Research Institute Keli Chemical Company. The water / gas ratio is about 0.28, the conversion temperature is 220℃, the conversion pressure is 4.4Mpa, and the calculated volumetric air velocity of dry gas is SV 5000h -1 ; Another about 35% of the gas is mixed with the transformed gas without shifting, and the CO content is about 13.5%, and finally through the gas cooler, the 40℃, 4.15MPa shift ga...

Embodiment 2

[0101] Using lignite with a water content of up to 35%, using crushed coal slag gasification to produce CH 4 The crude gas contains about 8.3% CH4, 47.5% CO, H 2 26%. The crude gas is washed and cooled, and the heat is recovered by the waste heat boiler, and then enters the sulfur-resistant transformation at 4.0MPa and 175°C (saturated steam).

[0102] After all the raw gas passes through the pre-changing furnace, it is divided into two streams, of which about 66% of the raw gas enters the main transformer system. A sulfur-resistant shift catalyst with high hydrolysis function is disclosed in Chinese Patent 200410008740.6. The catalyst uses magnesium-aluminum spinel as the carrier, Co-Mo as the active component and the addition of alkali metal promoters. The active component content is CoO 1.8-30%, MoO 37-15%, K 2 The conversion is carried out under the action of a sulfur-resistant shift catalyst with O 6~15%, the water / gas ratio is about 0.40, the shift temperature is 450℃, the s...

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Abstract

A technique for producing coal natural gas by utilizing crushed coal slag through gasification includes that part of crude coal gas containing CH4 produced by crushed coal slag through gasification receives sulfur tolerant shift, the other part of crude coal gas is conveyed in a sub-line and converges with the gas after sulfur tolerant shift to be cooled, the cooled gas is purified to remove CO2,H2S, naphtha and H2O and other impurities to obtain synthesis gas meeting the methane synthesis H / C ratio, the synthesis gas performs methane synthesis under the effect of methane conversion catalyst, and the methane-synthesis natural gas (SNG) is transmitted in long-distance pipeline network after compression and drying. The invention has the advantages of high gasification rate, high gasification intensity, low consumption and low water content of coal gas.

Description

Technical field [0001] The invention belongs to a coal-to-natural gas (SNG) method, and specifically relates to a process for producing coal-to-natural gas (SNG) by gasification of crushed coal slag. Background technique [0002] So far, the only plant in the world that uses coal as a raw material to produce alternative natural gas (SNG) is the Great Plains Synthetic Fuel Plant (GPSP) in North Dakota, USA, but its process (production) system has the following defects: [0003] 1. Coal gasification technology is relatively backward, with low gasification rate, low gasification intensity, high consumption and high energy consumption. [0004] 2. The steam consumption is large, the gas water volume is large, the gas water organic matter content is more, the composition is complicated, and the recovery and treatment are difficult. [0005] 3. There are many impurities in crude gas, and the purification process is long and complicated. Summary of the invention [0006] The purpose of the p...

Claims

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Application Information

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IPC IPC(8): C10L3/08C10K3/04C10K1/04C10K1/16C10K1/00C10L3/10
Inventor 王骏张庆庚李晓施福富黄顺泰张琦宇赵宇宏
Owner SEDIN ENG
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