Emission reduction and energy saving system capable of omitting GGH

Abstract

The invention discloses an emission reduction and energy conservation system without a GGH. The system comprises an air pre-heater, a high-temperature heat exchanger, a first-segment low-temperature heat exchanger, a dry-type electrostatic precipitator, an induced draft fan, a booster fan, a second-segment low-temperature heat exchanger, a desulfurizer, a wet-type electric precipitator, a third-segment low-temperature heat exchanger, a chimney, an air heat exchanger and a secondary draught fan, wherein the air pre-heater, the high-temperature heat exchanger, the first-segment low-temperature heat exchanger, the dry-type electrostatic precipitator, the induced draft fan, the booster fan, the second-segment low-temperature heat exchanger, the desulfurizer, the wet-type electric precipitator, the third-segment low-temperature heat exchanger and the chimney are sequentially connected to a boiler tail flue in series; the air heat exchanger and the secondary draught fan are sequentially connected to a cold secondary air duct in series. The output end of the secondary draught fan is connected with the input end of the air side of the air pre-heater through the air heat exchanger. The system further comprises a low-pressure heater, a first water pump, a second water pump and a third water pump. By means of the system of the structure, the dust removal efficiency of the dry-type electrostatic precipitator can be improved, the GGH is replaced by a new device to achieve the use functions of the GGH, and meanwhile, the purpose that waste heat of discharge smoke is recovered to the maximum extent is achieved.

Description

technical field [0001] The invention relates to the technical field of boiler power plants, in particular to an emission reduction and energy saving system capable of canceling GGH. Background technique [0002] With the rapid development of the global economy, people are also facing severe environmental problems while enjoying its fruits. The pollutants produced by coal-fired power plants and industrial boilers are the main source of air pollution. Reducing the dust content in the air has become a national focus. The Ministry of Environmental Protection’s No. 14 Announcement in 2013 requires that the dust removal facilities and desulfurization systems of the thermal power plants in the main urban areas of 47 key cities must meet the special emission limit of 20mg / m after the dust removal facilities and desulfurization systems are transformed at the chimney inlet. 3 . [0003] In my country's active thermal power units, the exhaust gas temperature of the boiler is about 13...

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Problems solved by technology

Affected by coal quality conditions in thermal power plants, when the type of coal used is poor or the boiler exhaust temperature is high, the specific resistance of the smoke and dust is high, resulting in a decrease in the dust removal efficiency of the dry electrostatic precipitator, and the dust emission level often does not reach the national level. Standard requirements, and when the GGH is not installed, due to the low temperature of the flue gas behind the absorption tower and the gypsum particles, the chimney is prone to "gypsum rain" and "white smoke". After setting the GGH, the "gypsum rain" The problem can be controlled, but the GGH investment and operating costs are relatively high. Judging from the current operating conditions, GGH still has the disadvantages of high resistance, serious corrosion and blockage, and high equipment investment.

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