Circulating fluidized bed boiler oxygen-enriched combustion dry desulphurization system and method

Abstract

The invention discloses a circulating fluidized bed boiler oxygen-enriched combustion dry desulphurization system and method. The dry desulphurization system comprises a hearth, a coal feeding hole, a primary air chamber, an air distribution device, a high-temperature cyclone separator, a tail flue, a coal economizer and a return device, wherein a desulfurizer feeding hole is formed in the coal feeding hole or / and in a return leg of the return device; a medium-temperature cyclone separator is arranged on the tail flue on the rear of the coal economizer; a return bin of the medium-temperature cyclone separator is connected with the hearth through a pipeline; a central drum of the medium-temperature cyclone separator is connected with the primary air chamber through an air hose and a primary air hose and is connected with the hearth through the air hose and a secondary air hose; an induced draft fan is arranged on the air hose; an oxygen injection device is arranged on at least one of the air hose, the primary air hose and the second air hose. The circulating fluidized bed boiler oxygen-enriched combustion dry desulphurization system can effectively solve the SOx up-to-standard discharge problem of a boiler, increase the utilization ratio of limestone, reduce consumption of limestone, improve desulphurization efficiency, realize efficient and economical desulphurization in the boiler as well as CO2 enrichment, facilitate compression, purification, utilization, sealing and storage of CO2, and meet environmental protection demand.

Description

technical field

[0001] The invention relates to an oxygen-enriched combustion dry desulfurization system and method for a circulating fluidized bed boiler. Background technique

[0002] Thermal power generation is a major energy consumer and pollutant emitter in my country, and it is also one of the important sources of air pollutants. Among them, CO 2 , SO 2 , NOx emissions accounted for more than 40% of the total emissions. The "Twelfth Five-Year Plan" outline proposes that by the end of 2015, the energy consumption per unit of GDP will be reduced by 16% compared with 2010, SO 2 , NOx emissions were reduced by 8% and 10% respectively. At the Copenhagen Climate Change Conference in 2009, the Chinese government announced a clear quantitative goal of controlling greenhouse gas emissions, and decided that by 2020, carbon dioxide emissions per unit of GDP will be reduced by 40% to 45% compared with 2005, which means that my country will achieve CO2 emissions. 2 massive emis...

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