Local oxygen-enriched combustion transformation system for conventional circulating fluidized bed boiler with external bed

Abstract

The invention relates to a local oxygen-enriched combustion transformation system for a conventional circulating fluidized bed boiler with an external bed. In the transformed system, secondary air is subjected to local oxygen-enriched combustion, while primary air, fluidizing air of a return feeder and fluidizing air of the external bed is still subjected to conventional air combustion. With the adoption of the transformation system, the combustion efficiency of the boiler can be improved, the heat loss of smoke vent is reduced, and the discharge amount of smoke pollutants, flow of air and smoke, output forces of a secondary air fan and an induced fan, and electrical load of a plant are reduced. The CO2 concentration in the flue gas is increased, the recovery cost of CO2 in industrial practices is lowered, and a solid foundation is laid for the whole oxygen-enriched combustion of the circulating fluidized bed boiler.

Description

technical field [0001] The invention relates to a partial oxygen-enriched combustion transformation system of a conventional circulating fluidized bed boiler, in particular to a local oxygen-enriched combustion transformation system of a conventional circulating fluidized bed boiler with an external bed, belonging to the technical field of power plant boilers. Background technique [0002] CO 2 It is mainly produced in the combustion process of fossil fuels. With the rapid development of society and economy, the demand for energy continues to increase, and the combustion and utilization of fossil fuels are also increasing, which leads to CO 2 Emissions are also increasing. At present, my country is the second largest CO in the world after the United States. 2 emitter country. my country is one of the few countries in the world where primary energy consumption is dominated by coal. With the rapid development of the economy and the continued growth of the population, my cou...

AI Technical Summary

Problems solved by technology

[0004] CO reduction during electricity production 2 Emissions and realization of CO 2 The premise of separation is to obtain high CO 2 Concentration of flue gas, while CO in conventional coal-fired power plant boiler exhaust 2 The concentration of CO is generally 14%~16%, and the low-concentration CO can be directly separated and recovered from the flue gas. 2 It will reduce the efficiency of the power station by 7%~29%, and increase the cost of power generation by 1.2~1.5 times

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