Two-stage sludge carbonization and incineration method and system

Abstract

The invention discloses a two-stage sludge carbonization and incineration method. The two-stage sludge carbonization and incineration method comprises the following steps that 1, first-time sludge carbonization is performed; 2, second-time carbonization is conducted on the sludge subjected to the first-time carbonization; 3, the sludge subjected to second-time carbonization is incinerated; 4, smoke produced after incineration is cooled to the predetermined temperature of the second-time carbonization and used in the step 2; 5, the smoke discharged in the step 2 is cooled to first-time carbonization temperature and used in the step 1. Harmless, reduced and resourceful disposal is conducted on the sludge through sludge incineration in the method, the heat produced in sludge incineration is provided for carbonization heating, the heat source is recycled, meanwhile the heat transfer efficiency of two-stage sludge carbonization is high, and smoke heat utilization is sufficient.

Description

technical field [0001] The invention relates to a sludge two-stage carbonization and incineration method and system. Background technique [0002] With the development of cities, environmental protection has been paid more and more attention. Various pollutants in the sewage are concentrated in the sludge produced by the urban sewage treatment plant, which has a great impact on the surrounding environment. As the construction of urban sewage treatment plants continues to accelerate, the scale of sewage treatment continues to increase, and the sludge output of sewage treatment plants has increased significantly, making the problem of sludge treatment more prominent. [0003] Concentrated pollutants in sludge mainly include inorganic and organic pollutants, which contain a large number of pathogens and various heavy metal elements. Therefore, sludge must be properly treated. Sludge treatment is to carry out deep and harmless treatment of sludge to completely solve the pollut...

AI Technical Summary

Problems solved by technology

The common practice of most of the sewage treatment plants in the country is to directly transport the sludge to the garbage dump without treatment or after simple treatment, and then dump it randomly, which is far from meeting the sanitary landfill standard; Stacking, breeding of mosquitoes and flies, the crops and all aspects will be destroyed, resulting in serious secondary pollution, which violates the principle of environmental protection, let alone the recycling of resources

[0004] At present, domestic sludge concentration and dehydration technologies are basically used. After sludge concentration and dehydration, the moisture content of sludge can only be reduced to about 80%. Such a high moisture content is not conducive to the subsequent transportation and disposal of sludge.

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