Nowadays, with the rapid development of economy and the increase of population, people's demand for living standard is improved. Domestic waste is increasing day by day, which has become a long-term pollution source of the city. It not only occupies a lot of land, but also causes air pollution, soil pollution and water pollution if it is not handled properly.
How to turn waste into treasure and form renewable energy has become an urgent problem to be solved, thus forming waste incineration power generation technology. However, the treatment of flue gas generated in the process of waste incineration is a problem worthy of consideration. With the support of the national waste incineration policy, it will enter a golden period of development. Relevant policies and national pollution control standards will also put forward higher requirements for waste incineration pollution control. Improve the environmental awareness and rights awareness of the public, and improve the technical level of waste incineration plants, especially the flue gas treatment technology in Shandong Province.
Flue gas treatment technology mainly refers to desulfurization. Limestone gypsum desulfurization process is the most widely used desulfurization technology in the world. About 90% of the flue gas desulfurization devices used in thermal power plants in Japan, Germany and the United States adopt this process. Its working principle is: limestone powder is made into slurry by adding water, slurry is pumped into the absorption tower as absorbent, and is fully mixed with flue gas; sulfur dioxide in flue gas reacts with calcium carbonate in slurry and air blown out from the lower part of tower to produce calcium sulfate; after calcium sulfate reaches a certain saturation, calcium sulfate crystallizes to form gypsum dihydrate.
The gypsum slurry discharged from the absorption tower is concentrated and dehydrated to make its water content less than 10%, and then transported by conveyor to the gypsum silo for stacking. The desulfurized flue gas is removed by mist eliminator, heated by heat exchanger and discharged into the atmosphere by chimney. Because the absorbent slurry in the absorption tower repeatedly circulates with the flue gas through the circulating pump, the utilization rate of absorbent is very high, the calcium and sulfur are relatively low, and the desulfurization efficiency can reach more than 95%.
The key of high temperature flue gas dust removal is the selection of filter bag. The polytetrafluoroethylene filter material used in the filter bag is heat setting. After being impregnated with polytetrafluoroethylene, a polytetrafluoroethylene protective film is formed on the surface and intersection of the fibers, so the dust can be easily removed. At the same time, the surface of the filter bag is treated with waterproof and oil proof, so that the filter material has excellent acid resistance, alkali corrosion resistance and hydrolysis stability. The filter bag has enough strength to bear the extra load of the filter bag and the accumulated dust. When the dust collector cleans up the dust, the pulse jet valve starts regularly to make the filter bag radial deformation and shake off the dust. The dust collector filters the unreacted desulfurizer, and the compressed air blows the unreacted desulfurizer back to the desulfurization tower, so as to improve the effective utilization rate of desulfurizer.
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