The hot air heating system of the dust collecting hopper of the electrostatic precipitator shared with the scr

Abstract

The invention relates to a hot air heating system shared by an electric precipitator ash hopper and selective catalytic reduction (SCR). The hot air heating system comprises a connection hot air duct, a regulation baffle, an inlet distribution header, ash hopper hot air heating interlayers, an outlet distribution header, a hot air / ammonia mixer and a frequency conversion ammonia metering pump. The heating system utilizes hot air serving as working medium and used by the electric precipitator ash hopper. House supply is saved remarkably. Exhausted high-temperature tail gas serving as diluent air of an SCR denitration system can sufficiently provide heat required by evaporation of liquid ammonia. The frequency conversion ammonia metering pump can regulate ammonia spraying amount required by SCR flexibly. High-temperature ammonia with five-percent safe concentration and air mixture is mixed with smoke flow through an ammonia spraying grating. Compared with the scheme utilizing an ammonia evaporation tank, an ammonia buffering tank and a cold dilution air fan to prepare the ammonia with five-percent safe concentration and air mixture, energy saving effect is obvious, and investment of capital construction is reduced. Output of the frequency conversion ammonia metering pump is controlled by a unit distributed control system (DCS), controllability of ammonia spraying amount is improved, time lag is reduced, and the remaining amount of ammonia at the SCR outlet can be controlled effectively.

Description

(1) Technical field: [0001] The hot air heating system for the ash collecting hopper of the electrostatic precipitator shared with the SCR of the present invention relates to a heating system used for the ash collecting hopper of the electrostatic precipitator of the coal-fired power station. The heat required to evaporate liquid ammonia. (2) Background technology: [0002] In the prior art, the ash hopper of the electrostatic precipitator of the coal-fired power station adopts an electric heating system / steam heating system to maintain the fluidity of the fly ash in order to prevent condensation and blockage, especially for the low-temperature electrostatic precipitator and the low-temperature electrostatic precipitator. Do not open the ash hopper heating system. The power consumption of a 1000MW unit's electrostatic precipitator ash hopper electric heating system reaches 720kW; the steam consumed by the steam heating system is less than 720kW in electric power generated i...

AI Technical Summary

Problems solved by technology

The power consumption of the electric heating system for the ash collecting hopper of a 1000MW unit is as high as 720kW; the steam consumed by the steam heating system is less than 720kW in the steam turbine unit. Loss of working fluid and heat

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