"Bathing fire for electricity" in domestic waste is 450 million kWh

Cities with high -speed development are suffering from the pain of "garbage siege". How to deal with daily domestic garbage has become one of the most difficult development issues that cities must face.

First use the domestic waste incineration to power generation, and then comprehensively use the scum generated after the waste incineration. Taiyuan in Shanxi allows the governance model of domestic waste to "waste into treasure". "Add points" to the environment.

How does domestic garbage "turn waste into treasure"? A few days ago, the reporter walked into Taiyuan Circle Economic Sanitation Industry Demonstration Base to find out.

Duty personnel monitor various data in real time in the control room.

Factory area clean no odor

The reporter drove to the south along Binhe West Road, Taiyuan City, and drove across North Society Village, Liu Du Township, Qingxu County, Taiyuan City. I saw a straight chimney not far away. "The location of the chimney is the factory area of ​​the domestic waste incineration power generation project (hereinafter referred to as the" domestic waste incineration power generation project ') factory area. This project is invested, built and operated by Taiyuan Kangheng Renewal Energy Co., Ltd. "The staff of the Taiyuan City Rong Environment Health Center introduced by the peers introduced.

Hearing "domestic waste incineration power generation project area", some people may think of such a picture: the roar of the machine's ears in the factory, the accumulated garbage exudes a pungent smell ...

The vehicle drove to the south of Southeast Society Village in Liudu Township and entered the plant area of ​​domestic waste incineration power generation projects. The reporter strolled in the factory area, and the clean road surface was hive -like, and the modern factories were smooth and layered. In the air, except for the fragrance of grass, there is no trace of odor.

Only the "proof" of garbage transport vehicles that are in a closed state in and out of the state is indeed a factory area for domestic waste incineration power generation projects.

The "digestion" of domestic garbage in domestic waste incineration power generation projects comes from various garbage transfer stations. After classification of garbage, non -recycled domestic waste was first transported by garbage collecting vehicles to the garbage transfer station, and then the garbage transport vehicle was delivered here.

Make the garbage fully fermentation

During the visit, one garbage transport vehicle will be shipped to the factory area of ​​the compressed domestic waste to the domestic waste incineration power generation project area. After weighing these vehicles through the ground pound system, they transport the domestic waste to the unloading platform through the high trestle bridge, and pour it into the garbage warehouse with a height of 33 meters, 55 meters long, and 30 meters wide.

Generally, domestic waste needs to be stacked in the garbage warehouse for 3 days to 5 days to dewater and ferment the garbage.

The staff of Taiyuan Kangheng Renewal Energy Co., Ltd. introduced that during the fermentation process, the garbage filtration liquid generated in the garbage warehouse flowed into the filter liquid collection system at the bottom and was transported to the sewage treatment stations in the factory area for treatment.

In the garbage hanging control room, the operator of the heavy machine is using garbage to catch, constantly turning the ingredients and feeding, so that the garbage is fully fermented. When turning the material, the operator should also check whether there are dangerous goods in domestic waste to prevent safety accidents.

During the garbage process, the electronic screen accurately shows the weight of each capture with the help of the electronic induction system. The operator said that this can adjust the weight of the garbage according to the needs of the burning boiler. Data show that garbage grabbing can capture 8 to 10 tons of domestic garbage each time.

For the fermented garbage, the operator grabs through the garbage and grabs it until the fight, and is continuously and uniformly delivered to the incineration furnace by the feeder.

The operator flip the material and feed in the garbage hanging control room.

The butterfly change of "bath fire"

In the incineration furnace, domestic garbage turned into flames. The tilted furnace is exhausted to make the garbage fully burn. The high -temperature flue gas generated by the incineration enters the remaining heat boiler, and the thermal steam is generated after the heat exchange with the heating surface of the boiler. Thermal steam enters the turbine power generation area through the pipeline. The turbine drives the operation of the generator, generates electricity, and then enters the power grid system through the boost station.

As we all know, the garbage will smell. In the field of domestic waste incineration power generation, the odor in the garbage warehouse is extracted through the pipelines set by the upper part of the garbage warehouse, and the fan is extracted and sent into the incineration furnace. This process has formed a negative pressure in the garbage warehouse, which can prevent odor from leakage.

After full burning garbage, there will be three categories of surplus -fly ash, flue gas and slag.

Flying ash is rich in a variety of heavy metals and pollutants. It needs to be cured and stable before landfilling. Cement and chelating agents are the most commonly used solidified and stable materials. The staff put the chelating agent, water, and fly ash and stir in the mixer according to a certain ratio. After stirring, the fly ash is temporarily stored for a period of time. When the water content and other indicators meet the relevant standards, the fixing and stable fly ash can be sent to the landfill to land.

After dust, desulfurization, decarnation, denitration and other processes, smoke gas, remove nitrogen oxides, hydrogen chloride, sulfur dioxide, etc., purify the standards and discharge.

Furnace slag is resource -based on the comprehensive utilization project of waste incineration in the same base.

Daily treatment of 3000 tons

The reporter came to the central control room of the domestic waste incineration power generation project to see the magical charm of science and technology through the monitoring terminal large LED display on the wall -the real -time status from the trash warehouse, the port to the slag port, and the burning in the furnace in the furnace The lamelores of domestic garbage can be seen here.

The control room on duty can complete the inspection of various production links as only to lightly tap the mouse. The temperature, water level, and the operating status of the generator in the incineration boiler also realize digital remote control. Staff can accurately control the incineration temperature of domestic waste, so as to generate as much steam as possible, thereby promoting the operation of the generator. "The furnace No. 1 to No. 4 is running. At this moment, the temperature in the furnaces of these four furnaces is as high as 900 degrees Celsius. At the same time, the display screen also displays other indicators of the four incineration furnaces in real time." Taiyuan Kangheng regenerates regeneration. The person in charge of Energy Co., Ltd. told reporters. In 2020, the domestic waste incineration power generation project was officially put into use. Since the full load is running, the project currently treats 3,000 tons of domestic garbage daily, solving about 60%of domestic garbage in Taiyuan. The annual incineration line is more than 8,000 hours and the annual power generation is 452 million kilowatt -hours. In addition to the power consumption of the plant and the park, the Internet power is 364 million kilowatt -hours, which can meet the annual electricity consumption of 300,000 households.

The scum is all treasures

The residue generated by the domestic waste incineration power generation project was transported to the raw material stack of the comprehensive processing workshop of the waste incineration furnace residue project. The project is operated by Taiyuan Shenheng Environmental Protection Technology Co., Ltd. (hereinafter referred to as "Shenheng Company").

The scum composition is complicated. In order to prevent the assembly line equipment from damage, the staff of Shenheng Company must screen the scum. For unreachable domestic garbage, the staff picks it out and accumulates to a certain amount, and then send them back to the waste incineration furnace and re -incinerate. The slag particles with a diameter of less than 0.1 meters can enter the process of magnetic selection.

During the magnetic selection, the suspension magnetic removal can screen out the furnaces containing magnetic metals such as iron on the conveyor belt and crushed first levels. When it is broken, this kind of slag is crushed through the wet sand bearing machine through the conveyor belt. The wet sand beating machine is crushed and continuously injected into rinse water. The slag and flushing water mixture output by the sand beating machine passed the iron -type magnetic removal and separated the iron.

Since then, after the sorting, the granularity of the regenerative aggregate, and the recycling metal classification, the staff will be divided into a small amount of aluminum from the slag, and the slag is made into different particle size and industrial clay to achieve the realization of the realization. use. "At this point, the garbage that originally polluted the environment completed a bad butterfly change." The person in charge of Taiyuan Kangheng Renewal Energy Co., Ltd. said.

Green water and green mountains are Jinshan Yinshan. The waste incineration power generation not only solves the problem of difficulty in disposal of garbage, but also becomes waste into treasure. While protecting the environment, it has created economic benefits and achieved the effect of "1+1> 2". Reporter Liang Yaohua Wen/Photo

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