Method for preparing methanol by coupling gasification of pulverized coal waste boiler with green electricity and green hydrogen to realize near-zero carbon emission

Abstract

The invention relates to the field of methanol preparation with zero carbon emission, and particularly discloses a method for preparing methanol with near zero carbon emission by coupling gasification of a pulverized coal waste boiler with green electricity and green hydrogen, which comprises the following steps: oxygen generated by an air separation device and oxygen by-produced by a water electrolysis device react with coal in a gasification device of the pulverized coal waste boiler to obtain synthesis gas; the pulverized coal waste boiler gasification device recovers heat of high-temperature synthesis gas through a waste heat boiler and a steam superheater to produce high-pressure superheated steam, and the high-pressure superheated steam is sent to an air separation device to drive an air compressor turbine; the synthesis gas is conveyed to a heat recovery device for further heat recovery; the synthesis gas discharged from the heat recovery device is sent to a purification device, only sulfur-containing acid gas is removed, decarburization is not needed, and purified gas containing carbon monoxide, hydrogen and carbon dioxide is obtained; one part of electric energy generated by the new energy power generation system is transmitted to the water electrolysis hydrogen production device, one part is used by other electric facilities of the whole plant, and the rest part is transmitted to the energy storage device to be stored.

Description

technical field

[0001] The invention belongs to a method for preparing methanol with near-zero carbon emission and environmental protection, and in particular relates to a method for preparing methanol with near-zero carbon emission through gasification of a waste boiler of pulverized coal coupled with green electricity and green hydrogen. Background technique

[0002] As one of the important organic raw materials in the chemical industry, methanol has a huge annual demand. As of 2020, the national methanol production capacity has exceeded 87 million tons per year, and the output has exceeded 66 million tons. Due to the resource pattern of "poor oil, rich coal and little gas" in my country, the domestic production of methanol is mainly based on the coal-to-methanol route, accounting for about 76% of the country's total production capacity. The coal-to-methanol process widely used at present is: the oxygen generated by the air separation unit reacts with coal to generate crud...

Examples

Embodiment Construction

[0022] Such as figure 1 As shown, the embodiment of the present invention provides a method for preparing methanol with nearly zero carbon emission by gasification of waste pulverized coal boiler coupled with green electricity and green hydrogen. Including the following steps:

[0023] (1) The oxygen produced by the air separation unit and the oxygen by-product of the electrolysis unit react with coal in the pulverized coal waste boiler gasification unit to obtain high-temperature synthesis gas, which is sent to the heat recovery unit for further heat recovery;

[0024] (2) The pulverized coal waste boiler gasification device recovers the heat of high-temperature synthesis gas through the waste heat boiler and steam superheater, produces 6.0-13.0MPaG superheated steam, and sends it to the air separation device to drive the air compressor turbine;

[0025] (3) The synthesis gas from the heat recovery unit is sent to the purification unit, only sulfuric acid-containing gas is r...

technical field

[0001] The invention belongs to a method for preparing methanol with near-zero carbon emission and environmental protection, and in particular relates to a method for preparing methanol with near-zero carbon emission through gasification of a waste boiler of pulverized coal coupled with green electricity and green hydrogen. Background technique

[0002] As one of the important organic raw materials in the chemical industry, methanol has a huge annual demand. As of 2020, the national methanol production capacity has exceeded 87 million tons per year, and the output has exceeded 66 million tons. Due to the resource pattern of "poor oil, rich coal and little gas" in my country, the domestic production of methanol is mainly based on the coal-to-methanol route, accounting for about 76% of the country's total production capacity. The coal-to-methanol process widely used at present is: the oxygen generated by the air separation unit reacts with coal to generate crud...

Examples

Embodiment Construction

[0022] Such as figure 1 As shown, the embodiment of the present invention provides a method for preparing methanol with nearly zero carbon emission by gasification of waste pulverized coal boiler coupled with green electricity and green hydrogen. Including the following steps:

[0023] (1) The oxygen produced by the air separation unit and the oxygen by-product of the electrolysis unit react with coal in the pulverized coal waste boiler gasification unit to obtain high-temperature synthesis gas, which is sent to the heat recovery unit for further heat recovery;

[0024] (2) The pulverized coal waste boiler gasification device recovers the heat of high-temperature synthesis gas through the waste heat boiler and steam superheater, produces 6.0-13.0MPaG superheated steam, and sends it to the air separation device to drive the air compressor turbine;

[0025] (3) The synthesis gas from the heat recovery unit is sent to the purification unit, only sulfuric acid-containing gas is r...

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