The principles of garbage disposal are harmlessness, reduction and resource utilization. Waste incineration power generation can save a lot of land resources by greatly reducing landfills. It also reduces the air pollution of groundwater and the surrounding environment of the landfill.
According to my country's current policies, urban domestic waste incineration power generation technology will be dominated by mechanical grate furnaces, supplemented by coal-waste mixed combustion fluidized bed waste incineration technology and other technologies. Based on the calculation of a two-stage reciprocating waste incineration equipment with a daily processing capacity of 1,800 tons, the annual power generation can reach 160 million kilowatt hours, which can save 48,000 tons of standard coal, and reduce annual nitrogen oxide emissions by 480 tons and sulfur dioxide emissions by 768 tons.
“Coalbed methane, domestic waste landfill gas, nitrogen oxides, etc. are important sources of global warming.” Han Yeju, President of China and Asia Pacific of the British Syndic Carbon Fund, believes that waste power generation is mainly affected by some The constraints of technical or process issues, such as the highly toxic waste gas generated by combustion during power generation, have not been effectively solved for a long time, so the key to effective emission reduction is the use of advanced technology.
It is understood that my country’s annual urban domestic waste production is about 150 million tons, of which landfill accounts for 70%, incineration and composting account for 10%, and the remaining 20% ??is difficult to recycle. Among them, the waste-to-energy rate is less than 10%, which is equivalent to wasting 2,800 megawatts of electricity every year. The value of discarded "renewable waste" is as high as 25 billion yuan.
According to the "National Urban Environmental Sanitation "Eleventh Five-Year Plan"", the national urban domestic waste removal volume will reach 180 million tons in 2010, and harmless waste treatment will reach more than 60%. Experts point out that if by 2010, the amount of waste incineration accounts for 10% of the total waste production, and the heat of incineration is used for power generation and heating, then from now to 2010, new waste incineration equipment with a daily processing capacity of 32,000 tons will be needed. .
With the continuous development of technologies in various aspects such as garbage recycling, processing, transportation, and comprehensive utilization, waste-to-energy generation is likely to become one of the most economical power generation technologies. From the perspective of long-term benefits and comprehensive indicators, it will be optimal. for traditional electricity production.