System of cement kiln for co-treatment of household garbage

Abstract

The invention relates to a system of a cement kiln for co-treatment of household garbage. The system comprises a garbage incineration and flue gas treatment system, a combustion air system, a peculiar smell gas treatment system, a steam boiler system, a garbage leachate treatment system, and a garbage ash residue and flying ash treatment system. According to the system of the cement kiln for co-treatment of the household garbage, a garbage incinerator and a cement clinker production line are better combined together, the characteristics of high temperature, high stability, high-concentration alkaline materials, long standing time and the like of a cement firing system are utilized, dioxin-like harmful ingredients, garbage ash residues in garbage incineration flue gas, harmful elements and garbage leachate in flying ash and peculiar smell inside a garbage storage pit are perfectly and completely treated in a harmless mode, the environmental impact can completely meet the requirement of national standards, and the aims of harmlessness, volume reduction, recycling and environmental protection of household garbage treatment can be truly achieved. The system for the treatment of the household garbage is simple in flow path, easy and convenient to operate, stable in running, small in investment and ideal.

Description

technical field [0001] The invention relates to a garbage disposal system, in particular to a municipal domestic garbage disposal system. Background technique [0002] Municipal solid waste refers to the waste generated by urban residents, with complex sources and complex composition, which can be roughly divided into organic matter and inorganic matter. In recent years, with the construction of municipal and public facilities in major cities, especially the rapid development of urbanization, urban power supply and gasification rate have increased significantly, residents' living and consumption levels have improved, and the content of organic matter in garbage is increasing. content is gradually decreasing. my country's garbage also has the characteristics of high moisture content (about 40-60%) and low calorific value (minimum 3700kJ / kg). [0003] At present, my country's garbage dumps over the years are about 6 billion tons, occupying 500 million square meters of arable...

AI Technical Summary

Problems solved by technology

However, the waste fly ash of waste-to-energy plants has high harmful components and belongs to the category of hazardous waste. It must be processed through strict treatment technology, usually through cement solidification and landfill. This kind of landfill fly ash still has the risk of polluting the environment and occupies part of the site.

The ash discharged from the waste incinerator of the waste-to-energy plant is generally disposed of by landfill. Because there are harmful components such as heavy metals in the waste ash, this method still has the risk of environmental pollution. For example, waste-to-energy plants in some countries such as Japan Accidents of environmental pollution have occurred in the landfilled ash, and some landfill sites have dug out the landfilled ash and sent it to the cement rotary kiln for incineration.

When the waste incinerator of the waste-to-energy plant incinerates waste, although the incineration flue gas has been incinerated at a high temperature in the waste incinerator, due to the large fluctuations in the composition and calorific value of the waste, the temperature is often low, resulting in the occurrence of dioxins. Harmful components pollute the environment. In order to eliminate harmful substances such as dioxins, it is usually necessary to desulfurize, denitrify, and remove dioxins from the waste gas, thus consuming a large amount of limestone, activated carbon, ammonia water, etc., and the desulfurized gypsum produced by desulfurization is harmful to the environment. Secondary pollution is caused. At the same time, after the activated carbon loses its activity, it needs to be treated again, which increases the pressure on the environment.

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