Cooling and white smoke eliminating device and method for circulating slurry for desulfurizing tower of thermal power plant

Abstract

The invention discloses cooling and white smoke eliminating device and method for circulating slurry for a desulfurizing tower of a thermal power plant, and belongs the fields of the flue gas purification and the white smoke elimination of utility boilers and metallurgical coking and relevant industrial boilers, and the like. The side surface of the bottom of the desulfurizing tower in the deviceis provided with electric butterfly valves; the electric butterfly valves, slurry circulating pump inlet pipes, slurry circulating pumps, a slurry cooler, a slurry jetting and boosting device, a slurry circulating pump outlet pipe and top-layer spray layers are connected in sequence. The device can be used for reducing the water replenishing amount of the desulfurizing tower, is used for decreasing the moisture content of flue gas, and is used for further eliminating white smoke. Meanwhile, the invention also provides the cooling and white smoke eliminating method for the circulating slurry for the desulfurizing tower of the thermal power plant. The latent heat of vaporization in the flue gas is recovered; the heat loss of the smoke exhausted from a boiler is further decreased; the moisture carried in the flue gas is reduced; the water resource is saved, and the white smoke from a chimney outlet is eliminated.

Description

technical field [0001] The invention relates to a device and method for cooling and eliminating white smoke by circulating slurry in a desulfurization tower of a thermal power plant, and belongs to the field of flue gas purification and white smoke elimination of power plant boilers, metallurgical coking and related industrial boilers. Background technique [0002] Coal-fired power plant boilers have a large proportion of exhaust heat loss during operation, accounting for more than 50% of the total boiler heat loss. Some thermal power plants operate with exhaust gas temperatures that are often higher than the design value. Therefore, reducing the exhaust gas temperature of power plant boilers has important practical significance for energy saving and emission reduction. At the same time, the flue gas generated during the operation of coal-fired power plant boilers contains not only a large amount of sulfur dioxide, but also a large amount of fine particles. One of the culpr...

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Problems solved by technology

In addition, because the flue gas discharged from the desulfurization outlet is saturated wet flue gas, it is mixed with cold air after being discharged from the chimney, causing the water vapor in the flue gas to condense suddenly to form white smoke, especially in winter, it is easy to cause visual pollution and affect the appearance of the environment

[0003] To deal with the white smoke problem of power plant desulfurization flue gas, the method of flue gas reheating was used in the past. Many power plants used GGH in the early stage, that is, the heat of high-temperature flue gas before desulfurization was used to heat the flue gas after desulfurization, and the heated flue gas When the temperature is above 75°C, this solution has the effect of eliminating white smoke, but does not make full use of energy. At the same time, this method will encounter the problems of acid dew point corrosion of equipment and equipment blockage and leakage. It is often used in the early stage. At present, most power plants GGH has been dismantled

In recent years, the method of eliminating white smoke has been MGGH. MGGH is a water-medium heat exchanger. The solution is generally to install a heat exchanger in the cooling section at the inlet of the electrostatic precipitator, and install a heat exchanger in the heating section at the outlet of the desulfurization. The heat of the flue gas in front of the dust collector heats the flue gas after desulfurization. This scheme has played a role in eliminating white smoke to a certain extent, but the renovation project is relatively large and the cost is high. At the same time, the heat exchanger at the outlet of the desulfurization tower is prone to corrosion and leakage. , less economical

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