Device combining waste-heat recovery and white elimination with wastewater concentration

Abstract

The invention discloses a device combining waste-heat recovery and white elimination with wastewater concentration. The device is used for solving the problems of flue gas waste-heat recovery and wastewater concentration in a power plant, and is composed of an absorption heat pump system, a wastewater concentration system, an evaporation drying system and the like. According to the device providedby the invention, the flue gas waste heat in a coal-fired power plant or other industries is utilized for wastewater concentration, the concentration process has little influence on the flue gas humidity, wastewater is turned into available water, and finally recycled flue gas heat is transmitted to a low-pressure heater system to realize gradient utilization of heat energy; and the concentratedand reduced high-concentration wastewater can be conveyed to the evaporation drying system, so that heat required by the evaporation drying system is greatly reduced, the influence on a unit is reduced, and the whole system has the advantages of low energy consumption, low investment, low operating costs and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a device for waste heat recovery and whitening combined with waste water concentration, in particular to a device for deep recovery of waste heat from flue gas in a thermal power plant, elimination of wet smoke plume, water collection, and waste water treatment or in other fields. A method and device for deep recovery of gas waste heat, elimination of wet plume, water collection and wastewater treatment. Background technique [0002] At present, the mainstream technology for eliminating wet plume is to arrange the flue gas condenser, spray tower after the desulfurization tower, or add a slurry cooler on the slurry circulation slurry pipe to cool down the flue gas at the outlet of the desulfurization tower to precipitate moisture, and use the original flue gas Waste heat is used to heat the clean flue gas. This type of technology not only cannot deeply ...

AI Technical Summary

Problems solved by technology

The use of steam evaporation can produce recyclable salt and realize the reuse of water in wastewater. The disadvantage is that it is difficult to recycle low-grade salt. The evaporation process requires high-quality steam, which requires high energy consumption, large investment, and high operating requirements.

The flue gas waste heat evaporation scheme has lower investment, lower operating costs, and improved downstream dust removal efficiency. The disadvantage is that it consumes high-quality flue gas waste heat, affects the flue gas temperature of the air preheater, leads to a decrease in unit efficiency, and increases the load on dust removal equipment. , if no concentration reduction is carried out, a large amount of water will enter the desulfurization system, resulting in a decrease in the evaporation of the desulfurization tower, affecting the amount of desulfurization flushing water, and the amount of treated wastewater will also be limited by the flue gas temperature and load

[0004] Due to the above-mentioned waste of energy and water resources and high investment cost in the conventional whitening technology at present, the elimination of wet plume has the problem that only investment has no profit. The desulfurization wastewater concentration technology consumes high-quality heat energy, and has high energy consumption, high investment cost, and operational requirements. High, adverse effects on unit efficiency and other issues

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