Coal-fired flue gas ultra-low emission and waste-heat utilization combined system and running method thereof

Abstract

The invention provides a coal-fired flue gas ultra-low emission and waste-heat utilization combined system and a running method thereof. The system includes a flue gas and air system, a heat supply network water system and a circulating water system. The flue gas and air system includes a dust remover, a high temperature waste heat recovery device, a desulfurization tower, a low temperature wasteheat recovery device, a reheater and the like which are sequentially connected through a flue gas and air passage. The high temperature waste heat device is connected to the heat supply network watersystem through a pipeline arranged between the high temperature waste heat device and the heat supply network water system. The heat supply network water system and the circulating water system exchange heat through a heat pump, so that the circulating water system and a low temperature and low grade heat source of flue gas of an outlet of the desulfurization tower are deeply utilized. The flue gas of an outlet of a boiler air pre-heater is subjected to dedusting, cooling, desulfuration and cooling again, phase change agglomeration, turbulent agglomeration and other effects are used for deepremoval of fine particles, moisture and soluble salts in the flue gas, and the flue gas ultra-low emission is achieved during flue gas and steam turbine condenser circulating water waste heat using. The coal-fired flue gas ultra-low emission and waste-heat utilization combined system and the running method have the advantages that the low-grade energy cascade utilization efficiency is low, and ultra-low emission of pollutants in the flue gas is achieved.

Description

technical field [0001] The invention relates to a system and an operating method thereof for ultra-low emission of coal-fired flue gas in conjunction with waste heat utilization, and belongs to the technical field of cogeneration of heat and power. Background technique [0002] my country is a large energy consumption country dominated by coal. At present, in order to achieve ultra-low emission of flue gas in existing coal-fired power stations, denitrification equipment, electrostatic precipitator, wet desulfurization equipment, wet electrostatic precipitator, etc. have been successively installed in the tail flue. Particles distributed in the range of 0.1-1 μm have a poor removal effect, and these fine particles are not easily deposited in the atmosphere, which can easily cause smog, damage the atmospheric environment, and damage human health. At this stage, the development direction of fine particle control technology is mainly to remove small particles after agglomeratio...

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Problems solved by technology

However, the direct heating method will result in huge energy consumption

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