Two-stage condensation and solution-dehumidification type white smoke eliminating device for low-temperature dust-containing smoke and working method

Abstract

The invention discloses a two-stage condensation and solution-dehumidification type white smoke eliminating device for low-temperature dust-containing smoke and a working method of the white smoke eliminating device. The device comprises a dehumidification and white smoke eliminating system, a waste heat recycling solution regenerating system and a cooling water circulating system, wherein the dehumidification and white smoke eliminating system comprises a closed heat source tower, a spraying tower and a dehumidifier; cooling water flowing from a liquid outlet of the spraying tower is conveyedinto the cooling tower so as to realize cooling water circulation. The dust-containing smoke in the device firstly enters the closed heat source tower to be subjected to first-stage condensation anddehumidification and enters the spraying tower to be in direct contact with cooling water so as to be subjected to second-stage condensation and dehumidification, wet smoke is further dehumidified bya saline solution in the dehumidifier, the content of water steam in the smoke is controlled within a non-condensation range, meanwhile, partial dust in the smoke can be further removed, so that the smoke is purified; and the solution regeneration process is finished by virtue of the waste heat of low-temperature smoke, and the energy consumption of the system is reduced.

Description

technical field [0001] The invention relates to a dehumidification device and a working method, in particular to a low-temperature dusty flue gas elimination white smoke device and a working method of two-stage condensation and solution dehumidification. Background technique [0002] The low-temperature dusty flue gas contains a large amount of water vapor. During the discharge process, when the dew point temperature of the flue gas is higher than the temperature of the nearby air, the water vapor in the flue gas will condense at the chimney outlet to form a "white smoke" phenomenon. At the same time, the condensed liquid in the chimney is easily carried out of the chimney mouth by the high-speed flowing flue gas, and then falls to the ground, forming "chimney rain" around the chimney, which is not conducive to the uplift and diffusion of the flue gas, and even damages the equipment and buildings around the chimney. It will cause corrosion and affect the surrounding ecologic...

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Problems solved by technology

Heating technology refers to raising the temperature of the flue gas by heating, keeping the absolute moisture content of the flue gas unchanged, and reducing the relative moisture content, so as to meet the technical requirements of eliminating "white smoke". The heating technology cannot recover the flue gas. Moisture usually needs to heat the flue gas to above 80°C, so a large amount of high-grade heat energy needs to be compensated; while the natural cooling technology is to cool the flue gas, reduce the temperature of the flue gas, and achieve supersaturation of the flue gas during the cooling process. A large amount of water is analyzed to reduce the absolute moisture content of the flue gas. The natural cooling method mainly includes two types. The first type is to use a single-stage or multi-stage partition wall heat exchanger, and the second type is the flue gas-cooling water direct contact method. , the dehumidification efficiency of natural cooling technology is low, and its performance is limited by the temperature of the cold source (cooling water), and the treated flue gas is still close to saturation, which cannot effectively solve the problem of "white smoke"; natural cooling + heating composite technology is a natural An organic combination of cooling technology and heating technology, first of all, through cooling and heat exchange, the temperature of the flue gas is reduced, the moisture content of the flue gas is greatly reduced, and the reheating range of the flue gas is also greatly reduced, thereby reducing the consumption of reheating heat sources. Due to the low temperature and grade of low-temperature flue gas, it cannot meet the reheating demand, and a higher-grade heat source is also required to compensate

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