Fluidized bed oxygen carrier auxiliary oxygen-enriched combustion system and method

Abstract

The invention discloses a fluidized bed oxygen carrier auxiliary oxygen-enriched combustion system and method. An oxygen tank, a fluidized bed hearth, a cyclone separator, an induced draft fan, a circulation fan and a gas storage tank are included; the oxygen tank communicates with a wind chamber, oxygen carrier bed materials and fuel are laid on a combustion bed; an exhaust gas outlet at the topof a hearth cavity communicates with the cyclone separator; the bottom of the cyclone separator communicates with the combustion bed through a down pipe and a return valve; the top of the cyclone separator is provided with a separated gas outlet, the separated gas outlet communicates with an air inlet of the induced draft fan and an air inlet of the circulation fan; the air outlet of the induced draft fan communicates with the gas storage tank; and an air outlet of the circulation fan communicates with an air inlet of the wind chamber through an air pipe and a return valve. According to the fluidized bed oxygen carrier auxiliary oxygen-enriched combustion system and method, oxygen carriers are used as bed materials, coal combustion is regulated by carrying and releasing oxygen by the oxygen carriers, the hearth heat distribution uniformity is improved, stable operation of equipment is ensured, and the problem that oxygen distribution is uneven under existing fluidized bed oxygen-enriched combustion, and consequently treatment is difficult is solved.

Description

technical field [0001] The invention relates to the technical field of coal combustion, in particular to an oxygen-enriched combustion system and method assisted by a fluidized bed oxygen carrier. Background technique [0002] Energy is the source of power to promote the high-quality development of my country's economy. my country's energy structure dominated by coal will not undergo fundamental changes in a short period of time. Among them, coal-fired power stations will still be the main source of my country's electricity. Improving coal combustion efficiency and implementing coal-fired carbon capture, storage, and utilization are of great significance to achieving my country's carbon emission reduction goals and building a clean, low-carbon, safe and efficient modern energy system. Fluidized bed oxygen-enriched combustion mainly uses pure oxygen obtained from air separation to replace air and mix with circulating flue gas, then enters the fluidized bed furnace and combust...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a fluidized bed oxygen carrier assisted oxygen-enriched combustion system and method for the above-mentioned deficiencies in the prior art. The fluidized bed oxygen carrier assisted oxygen-enriched combustion system and method adopts Oxygen is used as the bed material, and the coal combustion is regulated by carrying and releasing oxygen through the oxygen carrier, which improves the uniformity of heat distribution in the furnace, ensures the stable operation of the equipment, and overcomes the difficult problem of uneven oxygen distribution under the existing fluidized bed oxygen-enriched combustion. problem

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