Process for producing clean synthesis gas from crushed coal

A synthesis gas and crude synthesis gas technology, applied in the direction of gasification process, hydrogen/synthesis gas production, petroleum industry, etc., can solve the problem of increasing equipment investment cost, operating cost, increasing difficulty of purification and separation, and increasing investment, investment and consumption Advanced problems, to achieve the effect of reducing equipment costs and operating costs, reducing ammonia nitrogen content, and reducing burdens

Active Publication Date: 2015-05-06
TAIYUAN UNIV OF TECH
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  • Claims
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Problems solved by technology

It is a big advantage for the production of natural gas, the gas load of the methanation unit is greatly reduced, so the investment is low and the consumption is low; but for the production of synthetic gas, it is necessary to convert this part of methane into CO and H2, you need to increase the methane conversion unit, and the investment and consumption will increase, which is a big disadvantage
In addition, the main disadvantage of pressurized gasification of pulverized coal is: due to the countercurrent gasification bed, the composition of the generated gas is relatively complex, except for CO, H2, CH

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  • Process for producing clean synthesis gas from crushed coal

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Experimental program
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Effect test

Embodiment 1

[0045] Lignite is added to the crushed coal pressurized gasifier with a pressure of 2.5MPa, and the temperature of the generated crude gas is 315°C, which is preheated to 900°C through a heat exchanger, and O 2 , together into the high-temperature cracking and reforming reactor, when the temperature reaches 1000°C, at this temperature, various oils, low-carbon hydrocarbons, CH 4 Reforming to generate CO, H 2 and other small molecules, NH 3 converted to N 2 . Various oils and low-carbon hydrocarbons are completely decomposed in the pyrolysis reforming reactor, NH 3 The conversion rate is as high as 98.6%. Compared with crude gas, the molar amount of CO in crude syngas increased by 1.5 times, and its standard volume fraction increased from 10.3% to 19.9%; H 2 The molar weight of the product is increased by 0.9 times, and its standard volume fraction is increased from 27.2% to 40.3%. In addition, CO 2 The standard volume fraction of H is reduced from 22.3% to 18.0%, H 2 T...

Embodiment 5

[0050] Lignite is added to a crushed coal pressurized gasifier with a pressure of 4.0MPa, and the temperature of the generated crude gas is 330°C, which is preheated to 900°C through a heat exchanger, and O 2 , together into the high-temperature cracking reactor, when the temperature reaches 1000°C, at this temperature, various oils, low-carbon hydrocarbons, CH 4 Reforming to generate CO, H 2 and other small molecules, NH 3 converted to N 2 . Various oils and low-carbon hydrocarbons are completely decomposed in the pyrolysis reactor, NH 3 The conversion rate is as high as 98.5%. Compared with crude gas, the molar amount of CO in crude syngas increased by 2.8 times, and its standard volume fraction increased from 8.6% to 21.1%; H 2 The molar weight of the compound is increased by 3.1 times, and its standard volume fraction is increased from 15.7% to 41.5%. In addition, CO 2 The standard volume fraction of H is reduced from 21.7% to 17.1%, H 2 The standard volume fractio...

Embodiment 9

[0055] Bituminous coal is added into a crushed coal pressurized gasifier with a pressure of 6.0MPa, and the temperature of the generated crude gas is 440°C, which is preheated to 900°C through a heat exchanger, and O gas preheated to 600°C 2 , together into the high-temperature cracking reactor, when the temperature reaches 1000°C, at this temperature, various oils, low-carbon hydrocarbons, CH 4 Reforming to generate CO, H 2 and other small molecules, NH 3 converted to N 2 . Various oils and low-carbon hydrocarbons are completely decomposed in the pyrolysis reactor, NH 3 The conversion rate is as high as 96.9%. Compared with crude gas, the molar amount of CO in crude syngas increased by 4.2 times, and the standard volume fraction of CO increased from 6.1% to 20.8%; H 2 The molar weight of H is increased by 4.6 times. 2 The standard volume fraction increased from 10.4% to 38.2%. In addition, CO 2 The standard volume fraction of H was reduced from 27.4% to 19.4%, and H ...

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Abstract

The invention discloses a process for producing clean synthesis gas from crushed coal. The process comprises the steps of producing crude coal gas by virtue of a crushed coal pressurizing gasifying furnace, after carrying out heat exchange, supplying the crude coal gas together with preheated oxygen into a high-temperature pyrolysis reforming reactor to enable original water vapor and carbon dioxide in the added oxygen and crude coal gas to serve as oxygen-containing reaction media to react with organic matters such as various oil, low carbon hydrocarbon and CH4 in the crude coal gas, reforming the mixed gas into CO and H2, and converting most of ammonia gas in the crude coal gas into nitrogen by virtue of a high temperature action, wherein the temperature in the reactor can reach 900-1400 DEG C, and the outlet temperature of crude synthesis gas is 900-1200 DEG C. The crude synthesis gas does not contain tar, low carbon hydrocarbon and phenolic compounds, the content of NH3-N and the CODCr of condensed water are substantially decreased, and the yields of CO and H2 of low-rank coal are substantially increased.

Description

technical field [0001] The invention relates to a process for producing clean synthesis gas from crushed coal, in particular to a process for producing clean synthesis gas based on a crushed coal pressurized gasifier. Background technique [0002] Coal gasification is one of the core technologies to realize efficient and clean utilization of coal. The development goal of coal gasification is to use solid fuels including low-quality coal to generate large-scale, continuous, efficient and clean coal gas. Coal gasification can produce industrial fuel gas, civil fuel gas, chemical synthesis raw material gas, synthetic fuel oil raw material gas, hydrogen fuel cell, coal gas combined cycle power generation, synthetic natural gas, rocket materials, etc. [0003] At present, gasifiers mainly include fixed bed, fluidized bed, entrained bed and other gasifiers. The composition of crude gas produced by different gasifiers is different, especially the yield and composition of liquid oi...

Claims

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Application Information

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IPC IPC(8): C10J3/02C01B3/36
CPCC01B3/36C01B2203/0211C01B2203/0216C01B2203/0222C01B2203/1235C01B2203/1241C10J3/16C10J3/84C10J2300/1603
Inventor 申曙光石朝益孙瑞军李凡冯建祥李天津孙玉娟
Owner TAIYUAN UNIV OF TECH
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