Method and system for hydrogen production and power generation through co-gasification of coal and biomass

Abstract

The invention discloses a method and system for hydrogen production and power generation through co-gasification of coal and biomass. The method for hydrogen production and power generation comprises the following steps of 1, feeding oxygen, pulverized coal, water vapor and crushed biomass into a pressurized gasification furnace, and carrying out partial oxidation reaction to generate coal gas, 2, cooling the coal gas through a quenching device and then purifying through a purifying device, and removing impurities in the coal gas, 3, feeding the water vapor and the coal gas into a reforming device, and carrying out reforming reaction to generate synthesis gas, 4, feeding the synthesis gas into a coarse removal device to remove impurities, then feeding the synthesis gas into a fine removal device to remove carbon dioxide so as to obtain hydrogen, and injecting the carbon dioxide underground for sealing, and 5, feeding the hydrogen into the fuel cell, and carrying out chemical reaction on the hydrogen and the oxygen under the action of the catalyst to generate water and generate electric energy. The process is mature, economical and feasible, and has negative carbon emission.

Description

technical field [0001] The invention relates to the technical field of hydrogen production from coal and fuel cells, in particular to a method and system for co-gasification of coal and biomass to produce hydrogen and generate electricity. Background technique [0002] Compared with traditional fossil energy hydrogen production, the cost of hydrogen production from renewable energy is higher. China's coal-based resource endowment determines that coal-to-hydrogen is still an important way to produce hydrogen at the current stage. The process of the coal-to-hydrogen process is that raw coal, limestone and other raw materials pass through the pulverized coal or coal-water slurry preparation unit to make qualified pulverized coal or coal-water slurry, and then enter the gasifier together with the oxygen provided by the air separation unit. Oxidation reaction, the crude synthesis gas produced by the reaction is mainly composed of hydrogen, carbon monoxide and carbon dioxide. Af...

AI Technical Summary

Problems solved by technology

More importantly, the coal-to-hydrogen process produces a large amount of carbon dioxide emissions, and the hydrogen produced is gray hydrogen, which is contrary to the current plan for the use of hydrogen energy under the background of carbon neutrality.

Images