Low temperature electric precipitation system in fuel electric plant

Abstract

A low temperature electric precipitation system in a fuel electric plant comprises at least one air preheater, at least one electric precipitator and connecting pipes for connecting the air preheater and the electric precipitator together, a flue-gas heat exchanger for lowering the flue-gas temperature entering the electric precipitator to enable the flue-gas temperature to reach or be lower than flue-gas dew point at the temperature of 90 DEG C is arranged between the air preheater outlet and the electric precipitator inlet; the electric precipitator is communicated with a desulfuration absorption tower through an induced-draft fan; a chimney is connected with the rear part of the desulfuration absorption tower. The flue-gas heat exchanger adopts a backward flow heat exchange type; a vertical pipe heat exchange flow passage or a horizontal pipe heat exchange flow passage is arranged at the inner part of the flue-gas heat exchanger; the system has the characteristics that the project equipment investment is reduced; the auxiliary power ratio is lowered; the energy is saved; the consumption is reduced; the heat economy of the unit can be improved; the latest environment-friendly emission standard can be satisfied.

Description

technical field [0001] The invention relates to a low-temperature electric dust removal system of a thermal power plant, belonging to the technical field of thermal power plant design. Background technique [0002] Most of the flue gas heat exchangers in thermal power plants are arranged after the electrostatic precipitator, and some projects are arranged in front of the electrostatic precipitator, but the schemes arranged in front of the electrostatic precipitator are mostly used in renovation projects, and the flue gas entering the electrostatic precipitator The temperature is higher than the flue gas dew point temperature. The purpose of installing the flue gas heat exchanger is to use the waste heat at the tail of the boiler to heat the condensate water of the turbine to improve the thermal economy of the unit, or to heat the desulfurized clean flue gas to increase the temperature of the chimney exhaust gas. However, the arrangement of the flue gas heat exchanger behind...

AI Technical Summary

Problems solved by technology

With the implementation of the latest version of "Emission Standards of Air Pollutants for Thermal Power Plants", it is required that the emission concentration of smoke and dust be controlled below 30mg / Nm??, and the special emission limit of smoke and dust in key areas is even below 20mg / Nm??. Dust removal technology presents new challenges

Images