Feedwater replacement type economizer system for whole commissioning of denitration device

Abstract

The invention provides a feedwater replacement type economizer system for whole commissioning of a denitration device. The feedwater replacement type economizer system is characterized in that the feedwater replacement type economizer system comprises a first bypass, a second bypass and a third bypass, the first bypass and the second bypass are arranged between a downcomer and a feedwater pipeline, the first bypass is provided with a vessel pot, a stop valve, a circulating pump, a flow control valve, a stop valve and a check valve in sequence from the downcomer to the feedwater pipeline, the second bypass is provided with a stop valve, a flow control valve and a check valve in sequence from the feedwater pipeline to the downcomer, one end of the third bypass is in the position between the flow control valve and the stop valve of the first bypass, the other end of the third bypass is connected with the downcomer, the third bypass is provided with a stop valve, and a flow control valve is arranged between the first bypass and the second bypass in the feedwater pipeline. By means of the feedwater replacement type economizer system, economy of a boiler is not sacrificed under heavy load, the smoke temperature of an inlet of the denitration device can be increased under low load, and the feedwater replacement type economizer system is suitable for boilers with the smoke temperature of the denitration device inlet under low load reaching 40 DEG C.

Description

technical field [0001] The invention relates to a feedwater replacement economizer system for full operation of denitrification equipment, which is used to adjust the flue gas temperature at the inlet of power station boiler denitrification equipment under different loads, so as to meet the operation of the denitrification system in the whole working condition of the power station boiler. Transport belongs to the technical field of boilers. Background technique [0002] With the improvement of environmental protection indicators, reduce boiler unit NO X Emissions require denitrification equipment to be put into operation in the full load section of the boiler unit for stable operation, and under the current situation that the load rate of thermal power generation is not high, it is even more required to use denitrification equipment in the low load stage of the boiler to reduce environmental pollution. [0003] At present, most of the denitrification systems of large domest...

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Problems solved by technology

[0003] At present, most of the denitrification systems of domestic large units adopt SCR technology (selective catalytic reduction method), and because the reaction catalyst in the denitrification equipment system requires the temperature of the flue gas entering the denitrification equipment reactor to be between 320°C and 420°C, Between this temperature, the catalyst can work normally, otherwise, it can't work normally

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