Boiler energy saving and emission reduction system based on flue gas waste heat recovery and reheating technology

Abstract

The invention discloses a boiler energy saving and emission reduction system based on flue gas waste heat recovery and the reheating technology. The system comprises an air preheater, a flue gas cooler, an electrostatic dust collector, a desulfurizing tower, a flue gas reheater, and a chimney. A flue gas inlet of the air preheater is communicated with a flue gas outlet of a boiler. A flue gas outlet of the air preheater is communicated with a flue gas inlet of the flue gas cooler. A flue gas outlet of the flue gas cooler is communicated with a flue gas inlet of the electrostatic dust collector. A flue gas outlet of the electrostatic dust collector is communicated with a tail flue gas inlet of the desulfurizing tower. A desulfurized flue gas outlet of the desulfurizing tower is communicated with a flue gas inlet of the flue gas reheater. A reheated flue gas outlet of the flue gas reheater is communicated with a flue gas inlet of the chimney. A hot water outlet of the flue gas cooler is communicated with a hot water inlet of the flue gas reheater. A cold water outlet of the flue gas reheater is communicated with a cold water inlet of the flue gas cooler through a booster pump. The boiler energy saving and emission reduction system based on flue gas waste heat recovery and the reheating technology allows boiler flue gas to be treated and is long in service life, energy efficient and environment friendly.

Description

technical field [0001] The invention belongs to the field of power plant boilers, and relates to an energy-saving and emission-reduction system, in particular to a boiler energy-saving and emission-reduction system based on flue gas waste heat recovery and reheating technology. Background technique [0002] Coal is the most important primary energy source in my country, and coal-fired power generation plays a dominant role in power production. This energy structure will not change for a long period of time in the future. In the current situation of strong energy demand and tight coal supply, the development of high-efficiency, energy-saving, large-capacity, clean, environmentally friendly, and high-reliability power generation technologies can not only meet the urgent needs of the rapid development of the national economy for electricity, but also respond to environmental protection issues. increasingly stringent requirements and challenges. As the world's environmental pr...

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Problems solved by technology

[0004] 1) The temperature of the exhaust gas increases, which increases the amount of flue gas, thereby reducing the specific dust collection area of ​​the electrostatic precipitator, shortening the residence time of fly ash particles in the electrostatic precipitator, affecting the settlement of fly ash, and reducing the dust collection efficiency of the electrostatic precipitator. efficiency

[0005] 2) As the exhaust gas temperature rises, the specific resistance of the fly ash will rise to 10 11 (Ω·cm), the specific resistance of fly ash enters the range not suitable for electrostatic precipitator work, which greatly reduces the efficiency of electrostatic precipitator

[0006] 3) The temperature of the exhaust gas increases, which deteriorates the working environment of the fan and dust collector, shortens the life of the equipment, increases the accident rate, and affects the safety of the unit

[0007] 4) For the wet desulfurization system, too high exhaust gas temperature will increase the water consumption of the desulfurization system and waste precious water resources

[0008] 5) The flue gas after wet desulfurization is saturated flue gas, the water vapor content in the flue gas will increase greatly, the operating condition of the chimney will deteriorate sharply, the corrosion will intensify, and the safety of the unit will be affected

Although the phenomenon of "white smoke" from the chimney of the power plant is caused by the vaporization of the flue gas after desulfurization, it is harmless to the human body, but due to the refraction of light, especially in winter, the flue gas looks thicker, which is easy to cause Visual pollution, causing public panic

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