System for deeply eliminating white smoke of wet desulfurization flue gas

Abstract

The invention provides a system for deeply eliminating white smoke of a wet desulfurization flue gas, and belongs to the technical field of the flue gas desulfurization application. The system comprises a flue gas heat exchanging system, a desulfurization system and a heat pump circulating system. The flue gas heat exchanging system comprises a first heat exchanger and a second heat exchanger. Thedesulfurization system comprises a desulfurization tower. The desulfurization tower comprises a cooling absorbing section, an outlet section and a washing demisting section which are communicated. The heat pump circulating system comprises a generator, a condenser, an evaporator and an absorber. The system does not need an additional high-temperature heat source, and is capable of cooling desulfurization tower circulating liquid by using a heat pump technology, reducing moisture content of the purified flue gas, and through using circulating slurry heat and high-temperature inlet flue gas heat, improving a discharging temperature of the purified flue gas, greatly improving an unsaturation degree of the purified flue gas, thereby achieving a purpose of deeply eliminating the white smoke, and further reducing content of fine particulate matters in the flue gas through using condensation of water vapor.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization application, and in particular relates to a system for deeply eliminating white smoke from wet desulfurization flue gas. Background technique [0002] The flue gas produced by combustion of boilers, incinerators, catalytic cracking units, etc. needs to be desulfurized before being discharged into the air. Desulfurization generally adopts wet desulfurization. After desulfurization, the temperature of the flue gas decreases, and the water vapor in the flue gas is in a supersaturated state. When the flue gas is discharged into the air, a large number of small water droplets will be produced to form white smoke when it is cold, which not only wastes a lot of heat energy and water resources, but also causes strong visual pollution. Moreover, the small liquid droplets condensed by water vapor and the residual NO in the flue gas x , SO 3 The combination of particles such as aerosols an...

AI Technical Summary

Problems solved by technology

However, the above-mentioned technology needs to consider the problems of low-temperature cold source and high-temperature heat source, and the temperature rise of the flue gas is limited, so the ability to eliminate white smoke needs to be improved

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