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Chengdu Xiangfu environmental protection power plant looks like

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. From July 13 to 15, Xiangfu environmental protection power plant, Wanxing environmental protection power plant and Longfeng environmental protection power plant passed the harmless level assessment of municipal solid waste treatment facilities in 2020 organized by Sichuan Provincial Department of housing and urban rural development. On July 31, after publicity and Sanfeng environmental protection power plant which had passed the assessment before, all the municipal environmental protection power plants in Chengdu passed the harmless grade assessment. When

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talk about waste incineration power plants, people will think of “dioxin”, and then show the expression of “dislike”. The reason why we talk about the color change of incineration plant is not only related to the immature treatment technology, but also to the ignorance of waste incineration technology.

however, the appearance of the waste incineration power plant looks like a park, with staff quarters and basketball court tens of meters away, all of which are related to the “artifact” of the waste incineration plant. Let’s see how they eliminate harmful substances.

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recently, a reporter from Chengdu Commercial Daily red star entered Chengdu Xiangfu environmental protection power plant and followed the staff to witness the whole process of dioxin generation and death during waste incineration. The dioxins in

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will be decomposed when the temperature of

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is above 800 ℃. As we all know, dioxins may be produced by burning garbage, but few people know that dioxins will also decompose when the temperature is too high. ” He Yong, the person in charge of Chengdu Xiangfu environmental protection power plant, said that dioxins will be produced when the incineration temperature is between 200 ℃ and 400 ℃; once the temperature exceeds 800 ℃, dioxins will be decomposed again. In addition to the maintenance of equipment, the incinerator basically keeps burning throughout the year, and the temperature will be maintained between 1000 ℃ and 1100 ℃. In addition to dioxins, incineration of waste will also produce nitrogen oxides, sulfur dioxide, hydrogen chloride and other acidic gases.

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Chengdu Xiangfu environmental protection power plant has three incinerators, each of which can burn 600 tons of garbage every day. On the monitoring screen of the central control room, there are two monitoring screens corresponding to each incinerator furnace, and there are real-time temperature data of the incinerator in the middle. During the visit of Chengdu Commercial News – Red Star News reporter, the furnace temperatures of the other two incinerators were 1030 ℃ and 1035 ℃ respectively, except for the No. 1 boiler which was under maintenance and shutdown. And the red flame can be seen on the monitoring screens in the left and right furnaces. “If the monitoring system detects a drop in temperature, which may drop to 800 ℃ in two minutes, the auxiliary burner will inject natural gas into the furnace to raise the temperature in time.” He Yong told reporters.

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above 800 ℃ are only one of the conditions for the decomposition of dioxins. The gaseous dioxins need to stay at 800 ℃ for two seconds to decompose completely. If the time is too short, it may be too late to decompose and flow to other parts of the temperature less than 800 ℃. Therefore, the flue gas can be in a relatively stagnant state in the furnace through the cross-section design of flue and the structural design of furnace.

is a wonderful combination of ammonia and hydrated lime. After all,

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are gaseous after all, and it is inevitable that there will be fish caught in the net. It will take a process to raise the temperature to 800 ℃. Although the number of times is small, what should we do with the dioxin produced during this period?

“after the incinerator, there are deacidification reaction tower, bag filter and other links, respectively for different harmful gases and smoke.” He Yong said that the first step is to spray ammonia to reduce nitrogen oxides in flue gas to nitrogen and water. After that, alkaline hydrated lime and acid gas are used for neutralization reaction to remove the acid gas in the flue gas, as well as the smoke and dust mixed by vaporized heavy metals and dioxin, nitrogen oxide and acid gas from the fish caught in the net.

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artifact 3 activated carbon, bag filter and medicament solidification of

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are followed by activated carbon which can eat all harmful substances. “Open the flue and spray activated carbon for adsorption.” He Yong said that there is also a “door god” – bag type dust collector at the last stage of the whole flue gas channel. How thin is the bag gap? “We all know that PM2.5 and smaller particles can pass through.”

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reporters in the workshop saw that there are funnel-shaped collection devices under the bag filter to collect fly ash, including residual dioxin and other fish. The lower part of the funnel is connected with a closed pipe. The collected fly ash will be solidified with chemicals and finally turned into solid, which will be treated by special hazardous waste treatment company. In the end, only carbon dioxide, nitrogen and water vapor are left from the flue. “You can see that the whiter the smoke from the chimney, the cleaner it is. On the contrary, the darker the smoke is.” How important is

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garbage classification? It can reduce 100 tons of domestic waste from the source of dioxin

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into the furnace, which will turn into about 20 tons of reusable slag for the production of building materials. In addition, there are two or three tons of fly ash, which need to be treated by professional hazardous waste after solidification, which greatly reduces the amount of landfill. When one ton of garbage is put into the furnace, about 400 degrees of electricity can be generated. In this process, reducing dioxin and other harmful smoke and dust has something to do with everyone and needs everyone’s efforts.

He Yong told reporters that dioxins mainly come from the combustion of related substances such as plastic rubber; the vaporized heavy metals mainly come from the combustion of related substances such as bulbs, batteries and thermometers. There are not many batteries in a family, but once the base becomes larger, it will be great. The implementation of scientific waste classification can reduce the generation of harmful gases from the source. The cleaner the waste is burned, the more electricity is generated. So don’t underestimate everyone’s seemingly trivial efforts every time.

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by Ye yanlincong, a red star journalist of Chengdu Business Daily: does the garbage power plant look like a park? So many “artifact” blessing