Device and method for eliminating colored smoke plume generated during wet desulphurization

Abstract

The invention relates to a device and a method for eliminating colored smoke plume generated during wet desulphurization. The device comprises a wet desulfurization absorption tower, a wash-cooling system and a smoke heat exchange system. By arranging the wash-cooling system between a spray layer of a traditional wet desulfurization absorption tower and a defogger, smoke in the wet desulfurizationabsorption tower is washed and cooled, temperature of clean smoke at an outlet of the wet desulfurization absorption tower is lowered, and humidity of saturated smoke is decreased. By arranging the smoke heat exchange system at an inlet and the outlet of the wet desulfurization absorption tower, clean smoke at the outlet of the wet desulfurization absorption tower is heated by heat of raw smoke generated before desulphurization, temperature of exhaust smoke is enabled to be 10 DEG C higher than a dew point temperature, and no forming of colored smoke plume or gypsum rain is ensured. The device and the method for eliminating the colored smoke plume generated during wet desulphurization have the advantages that desulphurization efficiency is increased, the carried fluid in the smoke is reduced, dedusting efficiency of the wet desulfurization absorption tower is increased, exhaust smoke humidity is decreased, and the exhaust smoke is free from colored smoke plume or gypsum rain.

Description

technical field [0001] The invention relates to a device and method for eliminating colored plume in wet desulfurization, which is suitable for wet desulfurization processes such as limestone gypsum method, ammonia method, magnesium method and double alkali method. Background technique [0002] The wet desulfurization methods widely used in my country include limestone-gypsum method, seawater method, ammonia method, magnesium method, double alkali method, etc. According to statistics, wet desulfurization accounts for over 85% of the flue gas desulfurization market in my country, and over 98% of the flue gas desulfurization market for large thermal power plants. [0003] The wet desulfurization technology represented by the limestone gypsum method is mature, stable in operation and high in desulfurization efficiency. However, during the wet desulfurization process, the desulfurization slurry is in contact with the high-temperature flue gas. On the one hand, the flue gas temp...

AI Technical Summary

Problems solved by technology

The above technologies, 1 and 2, do not cool the flue gas, the water content in the flue gas is relatively high, the dew point temperature is high, and more heat energy is consumed for heating up. Easy to form colored plumes, especially in winter

Technical solution 3 uses a flue gas cooler outside the tower to cool the flue gas, which can reduce the humidity of the flue gas and reduce the heat energy consumption of heating. However, due to the large volume of the flue gas cooler outside the tower, it is very difficult to arrange, especially at present, almost all exhaust gas Desulfurization devices have been built for emissions, and the location of the transformation is generally very tight

In addition, adding a flue gas cooler on the flue will increase the flue gas resistance by about 400-800Pa, resulting in a large increase in the power consumption of the induced draft fan; technical solution 4 uses slurry cooling, which overcomes the difficulty of flue gas cooling outside the tower to a certain extent. The problem of increased air resistance, but since the solid content of the wet desulfurization slurry is generally about 20% (mass percentage), the slurry containing a large amount of solid particles is cooled by a water-cooled heat exchanger. Scaling on the surface seriously affects the heat transfer effect

Second, the solid particles will wash and wear the tubes of the heat exchanger, which will greatly reduce the service life of the heat exchanger

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