Oxygen-enriched combustion system for coal gas electricity generation boiler

Abstract

The invention discloses an oxygen-enriched combustion system for a coal gas electricity generation boiler. The oxygen-enriched combustion system comprises a boiler emergency stop protection system, as well as an oxygen pipeline, an air pipeline, a smoke exhaust pipeline and a coal gas pipeline which simultaneously communicate with a boiler furnace, wherein a coal gas quick cut-off valve is arranged on the coal gas pipeline; an oxygen content analyzer and an induced draft fan are sequentially arranged on the smoke exhaust pipeline; a blower and an air control valve are sequentially arranged on the air pipeline; an oxygen control valve and an oxygen quick cut-off valve are sequentially arranged on the oxygen pipeline; the boiler emergency stop protection system is electrically connected with the coal gas quick cut-off valve, the oxygen quick cut-off valve, the blower, the induced draft fan and the oxygen content analyzer simultaneously; and the oxygen content analyzer can send the oxygen content of boiler exhaust in the smoke exhaust pipeline to the boiler emergency stop protection system in real time, and the boiler emergency stop protection system controls to close the oxygen quick cut-off valve when the oxygen content of the boiler exhaust, received by the boiler emergency stop protection system, is larger than a security set value. The oxygen-enriched combustion system has the advantages that energy saving and environmental protection are achieved and the heat efficiency of the boiler furnace can be improved.

Description

technical field [0001] The invention relates to a gas-fired power boiler, in particular to an oxygen-enriched combustion system for a gas-fired power boiler. Background technique [0002] In power plant gas-fired power boilers, the gas-fired power boiler combustion system currently used includes air pipelines, smoke exhaust pipelines, gas pipelines equipped with gas quick-cut valves, and gas quick-cut valves. The opening and closing are controlled by the emergency shutdown protection system of the boiler. An induced draft fan is installed on the smoke exhaust pipeline, and a blower fan is installed on the air pipeline. The disadvantage of the gas-fired boiler combustion system above is that when the gas-fired boiler is working, the air as the combustion-supporting gas and the coal gas as the fuel are passed into the boiler furnace for combustion at the same time, so that the boiler generates steam for use by the turbo-generator. As the combustion-supporting air The oxygen c...

AI Technical Summary

Problems solved by technology

The disadvantage of the combustion system of the above-mentioned gas-fired power boiler is: when the gas-fired boiler is working, the air as the combustion-supporting gas and the coal gas as the fuel are passed into the boiler furnace for combustion at the same time, so that the boiler generates steam for use by the turbine generator. As the combustion-supporting air The oxygen content in the boiler only accounts for 21%, while the nitrogen accounts for 79%. On the one hand, the nitrogen does not participate in the combustion during the combustion process. The thermal efficiency of the boiler furnace, and in the high-temperature zone of the boiler furnace, nitrogen and oxygen react to produce a large amount of nitrogen oxides, which will pollute the environment when they are discharged from the boiler along with the exhaust gas generated by the boiler combustion; Drive the nitrogen in the air to do work, which will waste a lot of electric energy and increase the cost of production and use of enterprises

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