White smoke plume elimination system based on upper spraying and upper air inlet spray tower

Abstract

The invention relates to a white smoke plume elimination system based on an upper spraying and upper air inlet spray tower. The white smoke plume elimination system comprises a spraying subsystem, a water treatment subsystem, a heat pump subsystem, a water circulation subsystem and a smoke reheating subsystem, wherein the water spraying subsystem consists of a spray layer comprising a plurality ofnozzles and a second water pump; the water treatment subsystem consists of a filter tank and a dosing tank which are connected; the heat pump subsystem consists of a compressor, an evaporator, a throttle valve and a condenser which are sequentially connected in series; the cooling water circulation subsystem is composed of a water pool, a first water pump and a connecting pipeline; the smoke reheating subsystem is composed of an air heater, a fan and an air mixing flue; a spraying layer comprising a plurality of nozzles is arranged in the spray tower, and is connected with the cooling water circulation subsystem and the heat pump subsystem through a second water pump; the hot air outlet of the condenser is connected with the mixed flue gas outlet of the spray tower; an outlet of the condensed water and cooling water of the spray tower is connected with the water treatment subsystem; and the dosing pool is connected with the evaporator in the heat pump subsystem; the fan is connected with the condenser in the heat pump subsystem.

Description

technical field [0001] The invention relates to a system for treating flue gas discharged from boilers in enterprises such as coal-fired power plants and iron and steel plants, in particular to a system for eliminating white smoke plumes. Background technique [0002] More than 85% of domestic coal-fired power plants and steel sintering flue gas treatment adopts wet desulfurization process, the temperature of the discharged wet flue gas is 45-55 ℃, and the moisture content is close to saturation. The low-temperature saturated wet flue gas is directly discharged through the chimney and mixed with the lower-temperature ambient atmosphere. A large amount of water vapor in the flue gas condenses into small droplets. After the refraction or scattering of light, the flue gas appears white or off-white, that is, The so-called "white smoke plume" causes obvious visual pollution (this phenomenon is especially obvious in winter), and also affects the normal life of surrounding residen...

AI Technical Summary

Problems solved by technology

Heating and dehumidification mainly heats the low-temperature flue gas after desulfurization by heating the high-temperature flue gas before desulfurization, such as the common GGH heat exchanger. However, flue gas leakage will occur in actual operation, resulting in a serious discharge of flue gas pollutants.

There are also some other applications of partition heat exchangers, such as heat pipe heat exchangers, plate heat exchangers, etc., which are used to condense flue gas. During operation, problems such as equipment corrosion, scaling and slagging will occur, resulting in serious heat transfer efficiency. In addition, the partition wall heat exchanger generally has the problem of limited heat exchange area; the spray condensation in the desulfurization tower is to install a set of water spray system inside the desulfurization tower, which will lead to the height of the desulfurization tower is too high, and the flow resistance of the system will increase. The energy consumption of the fan is increased, and the operating cost is very high; flue condensation to eliminate white smoke is to install a heat exchanger in the flue at the outlet of the desulfurization tower to reduce the temperature of the flue gas at the desulfurization outlet, reduce the moisture content of the flue gas, and then eliminate the white wet plume. However, this method has high requirements on the material of the heat exchanger, but the reconstruction project is relatively large and the cost is high. At the same time, the heat exchanger at the outlet of the desulfurization tower is easy to corrode and leak, and the economy is poor.

The effect of solution dehumidification is stronger than that of pure water, but it is only experimental research and has not yet been applied

Cyclone dehumidification is to set swirling blades inside the chimney, forming a spiral flow field inside the chimney, small droplets in the flue gas collide and condense and become larger, and the liquid water droplets are removed by centrifugal action, the dehumidification and whitening effect of the system is limited, and increases Running resistance of the whole system

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