Combined type flue gas residual heat comprehensive utilization system

Abstract

The invention discloses a combined type flue gas residual heat comprehensive utilization system. A first-stage flue gas cooler and a second-stage flue gas cooler are arranged in front of and behind a dust collector respectively to realize stepped utilization of residual heat of exhaust smoke; condensed water with high entropy is heated at a flue gas high-temperature section; cold air with low entropy is heated in a flue gas low-temperature section; and a flue gas low-temperature section cooler and a flue gas high-temperature section cooler run in series. By adopting the comprehensive utilization system, the inlet water temperature level and the closed circulation water temperature level of the second-stage flue gas cooler are raised, and the risks of low-temperature corrosion and closed circulating water freezing in the flue gas cooler are decreased.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of flue gas waste heat, in particular to a combined system for comprehensive utilization of flue gas waste heat. Background technique [0002] The large consumption of fossil fuels and the excessive growth of consumption have made people feel the end of their reserves in the foreseeable future; coal-fired power generation units using fossil fuels account for more than 70%, so how to reduce the energy consumption of coal-fired power plant boilers in my country? Consumption has become the focus of today's work. In recent years, due to the sharp rise in international energy prices, the price of coal used in domestic power generation has also risen very high, power generation companies have suffered serious losses, and the significance of energy conservation and consumption reduction has become increasingly prominent. Therefore, in close connection with the needs of my country's coal...

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the deficiencies in the prior art above, the purpose of the present invention is to provide a combined flue gas waste heat comprehensive utilization system, which solves the economic problems of high exhaust gas temperature and large exhaust gas loss in power plants, and also solves the problems caused by the exhaust gas temperature. High impact on the safety of the bag filter operation, and solve the problems of using auxiliary steam to heat the heater, the low utilization hours of the surface heat exchanger, poor thermal economy and even low-temperature corrosion of the air preheater , also has the advantage of being adjustable

Images