Boiler smoke gas multipollutant ozonization and simultaneous elimination device and method therefor
A technology for boiler flue gas and ozone oxidation, applied in chemical instruments and methods, separation methods, air quality improvement and other directions, can solve the problem of high energy consumption and achieve the effect of meeting environmental protection requirements
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Embodiment 1
[0026] As shown in Figure 1, the air or oxygen is sent to the ozone generator after drying and purification to prepare high-concentration ozone. According to the flue gas nitrogen oxide concentration and removal rate requirements, the molar ratio of ozone to nitrogen oxide is 1.1, and the reaction time is guaranteed to be at least 0.5s. The nozzle is sprayed with a porous grid, and the treated flue gas enters the lye washing tower after passing through the electrostatic precipitator, and the absorption liquid is recycled, and the flue gas is sent to the chimney for emission after wet washing and demisting. The washing tower uses lye as the absorbent, and the washing tower is a spray tower or a packed tower. The lye used as an absorbent is one or more of sodium hydroxide, potassium hydroxide, calcium hydroxide, calcium oxide, calcium carbonate or ammonia water, the lye is recycled, and the absorbed sulfate and nitrate are concentrated and crystallized , at the same time replen...
Embodiment 2
[0028] As shown in Figure 2, air or oxygen is fed into the ozone generator to prepare high-concentration ozone, and the ozone is sprayed into the low-dust flue at about 110 °C before the lye washing tower after the electrostatic precipitator. The amount of ozone injected is based on the nitrogen oxidation of the flue gas According to the concentration of pollutants and the removal rate requirements of various pollutants, dynamic adjustment is made according to the molar ratio of ozone to nitrogen oxides of 2.0, and the position of the injection point ensures that the flue gas has a residence time of more than 0.5s from the entrance of the scrubber. The injection adopts porous grid-shaped injection measurement to strengthen the mixing. The treated flue gas enters the lye washing tower for absorption. Air pollutants such as nitrogen oxides, sulfur oxides, mercury, chlorine, and fluorine can be efficiently absorbed, and the lye washing The lye used in the tower can be one or more ...
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