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Integration device and method for coproducing carbon monoxide, methanol, hydrogen and refined synthetic gas in process of producing synthetic gas from coal

A coal-to-synthesis gas and integrated device technology, applied in the field of coal chemical industry

Inactive Publication Date: 2013-08-21
河南省化工设计院 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are many records in the prior art for the preparation of carbon monoxide, methanol, hydrogen, and refined synthesis gas from coal-to-synthesis gas, these four products are co-produced from coal-to-synthesis gas at the same time, and the output of these four products must be controlled. Controlling the purity of hydrogen and hydrogen, there is no good method at present

Method used

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  • Integration device and method for coproducing carbon monoxide, methanol, hydrogen and refined synthetic gas in process of producing synthetic gas from coal

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Experimental program
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Effect test

Embodiment approach

[0046] (1) Gasification

[0047] The gasification unit scale is 1.05 million tons / year (CO and H 2 Effective gas volume), including coal water slurry preparation, coal water slurry gasification and slag water treatment. 6 coal-water slurry gasifiers, 4 open and 2 standby; 4 sets of slag water treatment, 2 open and 2 standby.

[0048] (2) Conversion and heat recovery

[0049]The conversion and heat recovery unit has two functions: first, recycle the waste heat from the crude synthesis gas at about 238 °C from the gasification unit and cool it to 40 °C, and send it to the low-temperature methanol washing unit for purification; second, When it is necessary to adjust the CO content in the crude synthesis gas, a part of the crude synthesis gas passes through the shift furnace, which is equipped with a sulfur-resistant shift catalyst, so that the CO in the crude synthesis gas and the added H 2 O vapor transforms to H 2 and CO 2 , thereby changing the hydrogen-to-carbon ratio of...

Embodiment 1

[0060] Product: CO 600,000 tons / year

[0061] Methanol 440,000 tons / year

[0062] The crude synthesis gas produced by the gasification of coal-water slurry, all the gas does not go through the conversion furnace, after heat recovery, it is sent to low-temperature methanol washing and purification, and about 60% of the purified gas is separated from CO and cryogenically separated to produce 600,000 tons / year of CO and 85% of the hydrogen-rich gas is separated, and the hydrogen-rich gas is all incorporated into the methanol synthesis gas, just to adjust the hydrogen-carbon ratio at f=(H 2 -CO 2 ) / (CO+CO 2 ) = between 2.05 and 2.15, and about 40% of hydrogen-rich synthesis gas is incorporated to produce 440,000 tons / year of methanol.

[0063] Under this working condition, all the CO and H contained in the crude syngas 2 CO and H needed for the production of CO and methanol synthesis 2 Basic balance, no need to convert CO to H 2 and CO 2 , to reduce CO 2 emissions and carb...

Embodiment 2

[0065] Product: CO 360,000 tons / year

[0066] Methanol 360,000 tons / year

[0067] High-purity hydrogen 05,000 tons / year to 17,000 tons / year

[0068] Refined synthesis gas 210,000 tons / year to 130,000 tons / year

[0069] The crude synthesis gas produced by the gasification of coal-water slurry is divided into two parts after heat recovery: a part of the gas is sent to the unconverted gas scrubber for washing with low-temperature methanol after heat recovery, and the refined synthesis gas after purification , which is further divided into the refined synthesis gas that is directly sent out and the cryogenic separation of CO to produce CO; the other part of the gas needs to pass through the shift furnace to convert CO into H 2 and CO 2 After recovering heat, it is sent to the shift gas scrubber for low-temperature methanol washing, and the purified shift gas is demethanol-synthesized to produce methanol. The hydrogen-rich gas extracted by the CO cryogenic separation unit is se...

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Abstract

The invention relates to an integrated device for coproducing carbon monoxide, methanol, hydrogen and refined synthetic gas in a process of producing synthetic gas from coal, which comprises a gasification unit 1, a transformation and heat recovery unit 2, a low-temperature methanol cleaning and purification unit 3, a CO cryogenic separation unit 4, a pressure swing adsorption hydrogen productionunit 5 and a methanol synthesis and rectification unit 6. The crude synthetic gas at the outlet of the gasification unit is divided into two systems: sequentially through the heat recovery unit and low-temperature methanol cleaning transformed gas washing tower, the first system comprises three routes, wherein the first route sequentially passes through a molecular sieve adsorption station, a cold box and a CO compressor to obtain the CO product, the second route directly obtains the refined synthetic gas product, and the third route sequentially passes through the molecular sieve adsorption station, cold box and pressure swing adsorption hydrogen production unit to obtain the high-purity hydrogen product; and the second system is sequentially connected with a transformed heat recovery device, a low-temperature methanol cleaning transformed gas washing tower and a methanol synthesis and rectification unit to obtain the methanol product. The method solves the problem in regulating and controlling the yields of the four products and the purity of the hydrogen.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a device and method for producing carbon monoxide, methanol, hydrogen and refined synthesis gas from coal-based synthesis gas. Background technique [0002] my country is a country with more coal, less oil and less natural gas. Coal resources are abundant, and coal accounts for more than 70% of primary energy. Coal is not only the main energy source, but also an important raw material for the production of chemical products. Almost all petrochemical products can be prepared from coal. Therefore, the development of coal chemical industry is of great significance. However, the process of using coal as an energy source and chemical processing has serious environmental pollution; the construction of industrial devices requires relatively high investment. Therefore, the utilization of coal, especially the development of coal chemical industry is restricted. Using coal as raw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/48C10K1/16C10K3/00C10K1/04C10J3/84C01B3/56C01B31/18C07C31/04C07C29/152C01B32/40
CPCY02P20/10Y02P20/50Y02P20/52
Inventor 杨志敏张晓安费丽明魏毅力
Owner 河南省化工设计院