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Optimization Strategy of Environmental Protection Measures in Municipal Waste Incineration Power Plant

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Optimization Strategy of Environmental Protection Measures in Municipal Waste Incineration Power Plant

Operation status of 1. process

Germany was the first country in the world to adopt the waste incineration process, and they now have about 20 units that rely onWaste incineration power generationAs well as more than 60 sets of devices for the recovery of heat energy through garbage combustion, the daily power supply and heating problems of most residents in German cities have been solved. United States inwaste incineration treatmentOn the other hand, it also realized the transition from landfill to incineration earlier, and also successfully built more waste incineration power generation devices. Since the 1980 s, the United States has begun the construction of waste incineration power plants. This has enabled the United States to better handle municipal solid waste on the one hand, and on the other hand, it has also obtained very considerable economic benefits from it. So far, the United States has more than 400 large-scale waste incineration power plants, and the daily treatment of municipal solid waste is close to 4,000 tons. At the same time, so that most of the residents living in the city, heating and power supply have been guaranteed.

At present, all parts of our country have shown high enthusiasm for waste incineration treatment, and waste incineration power generation has also entered the application stage in our country. At present, some small and medium-sized cities in my country are also actively exploring the feasibility of waste incineration and implementing waste incineration technology. Therefore, the conditions for waste incineration in China are basically mature.

Hazards of Traditional Municipal Waste Incineration in 2.

1. Air pollution

From the past environmental impact assessment data, it can be understood that in the past, urban waste incineration would discharge smoke and dust through 80M high chimneys, which contained a large amount of toxic gases. The city would produce smog under the influence of these toxic gases.

2. Water source pollution

In the traditional urban waste incineration link, there will be harmful water sources such as landfill leachate and domestic sewage discharged from sewage treatment plants. After these water sources enter the river, the Yangtze River and other related water systems will be polluted.

3. Solid waste pollution

In the past, a large amount of slag was produced in the burning of garbage in the city. If the slag is not completely burned, there will be a large amount of dioxins and highly toxic substances. Once these solid wastes spread, they will bring serious pollution.

4, odor pollution

In the past, the treatment of urban garbage did not adopt closed treatment, which made the garbage often emit a variety of stench, and it was difficult to guarantee that there would be no fall during the transportation of garbage, thus polluting the air during the transportation.

3. Modern Urban Waste Combustion Electricity Environmental Protection Optimization Strategy

1. Solidification and utilization of fly ash

After municipal waste is incinerated in the power plant, there will inevitably be residues of fly ash and ash slag. These residues will contain dioxins and harmful substances such as alkali metals. They cannot be directly discharged into the environment. They must be solidified, otherwise the environment will be seriously polluted. The fly ash left in the incineration process of municipal waste can be transported to the fly ash silo through the portable machine of the power plant, then the bulk cement is transported to the cement silo through the equipment. Under normal circumstances, the fly ash curing station will be equipped with a tank for preparing and storing chelating agents. The cement and fly ash can be sent to the mixing mixer according to a certain proportion for mixing, and an appropriate amount of chelating agent solution and water are added, and finally transported to the landfill site by the transport vehicle.

2. Slag recycling

The slag remaining after municipal waste incineration will also include uneven mixtures of combustibles, slag, metal, glass and ceramics, which can be transported outside the plant for secondary use, for example, the slag can be made into bricks or recycled as metal for use in construction or other fields. This process is becoming more and more popular at this stage. At this stage, the waste residue of municipal solid waste incineration is often used as the production of blocks, plastic concrete products and other products, which is an ideal way for the comprehensive utilization of waste residue.

3. Cascade recycling of sewage

Generally speaking, most of the wastewater produced by municipal waste incineration power generation has basically the same composition as the wastewater produced by other waste combustion. On one side, it mainly contains leachate. This liquid composition is very complex and is a kind of organic thick. If the purification of this kind of wastewater is unreasonable, if it is discharged into the urban trench, it will cause serious damage to the surrounding natural ecology. If the waste water generated in the process of waste incineration only has suspended solids and increased salt content, then the waste water can be used in other places in the plant that do not have higher requirements for water quality, such as the washing water of the unloading platform, road sprinkling, slag cooling, plant greening, boiler blowdown cooling water and other places, and the waste water of the circulation system can be reused. On the one hand, the new water consumption of the power plant can be significantly reduced, it can also reduce the amount of sewage discharged from power plants, which can be described as an optimization measure for both water saving and environmental protection. For the leachate in the municipal waste, it can be discharged to a special leachate treatment station, and the leachate after treatment can be sent back to the cooling tower to make up water. For the leachate with higher concentration, it can be sent back to the incinerator for combustion again to avoid pollution to the environment.

4. Flue gas purification

Inevitably, the combustion of garbage will produce flue gas, which will contain dioxin substances, dust particles, heavy metal substances and acidic compounds, etc., the treatment of these toxic substances is very critical. At this stage, large dust collector is an important equipment to realize dust separation. The flue gas generated in the process of waste incineration is usually in a state of weak acid, high temperature and high water vapor concentration. Therefore, in the process of selecting the internal specifications of the bag dust removal equipment, attention should be paid to it. If the selected filter cloth specifications are unreasonable, toxic substances will stick to the filter bag and are not easy to remove. At the current stage, the municipal waste incineration will select the flue gas purification filter bag with better cost performance, and the acidic substances produced in the combustion process are mainly used in the semi-dry acid, wet acid and dry acid component elimination process at this stage.

5. Control of odor pollution

There are many specific sources of stench in the city. From the perspective of municipal waste incineration, it mainly includes two aspects. One of them is the stench gas generated by the long-term storage of waste in the discharge pit, feed hopper and storage tank of the incinerator workshop. The other is the odor emitted by the waste leachate dropped by the transport vehicle after being irradiated by sunlight during the garbage transportation. In terms of the control method, the malodorous gases generated in the storage pool and unloading pit can be mainly avoided by setting up a fully enclosed storage pool and unloading pit to avoid the diffusion of malodorous gases. In combination with reasonable methods, the sorting of garbage in the garbage storage pool can be strengthened to reduce the probability of garbage fermentation as much as possible, so that various malodorous gases that may appear in the incineration of municipal garbage can be effectively controlled. In addition, some spray nozzles can be set up in the discharge chamber, such as spraying deodorant in the discharge pool, so that the malodorous gas can be effectively controlled.

Article from: Polaris power network