Sludge drying burning combination treatment method

A combined treatment and sludge drying technology, applied in combustion methods, dewatering/drying/concentrating sludge treatment, incinerators, etc., can solve the wear and corrosion of the rear heating surface, the narrow applicability of wet sludge, and the pollution of heat transfer medium. and other problems, to achieve the effect of reducing the amount of fly ash, reducing energy consumption, and simplifying the working fluid heat transfer system

Active Publication Date: 2008-09-17
JIANGSU JINSHAN SOLID WASTE RESOURCE TECH
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Problems solved by technology

Solve the problems of the current direct incineration method of wet sludge, such as severe wear and corrosion of the heating surface at the tail, and high exhaust temperature. The method of dryi

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  • Sludge drying burning combination treatment method

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[0026] specific implementation plan

[0027]The present invention adopts a low-magnification circulating fluidized bed incinerator, the circulation rate is 2-3, and the cross-sectional state flow velocity in the incinerator is 1.5-3m / s, mainly based on the following considerations: ①The dry sludge has a small particle size and a critical fluidization velocity Small; ②The wear rate of the buried pipe in the dense-phase area of ​​the incinerator is proportional to the cube of the flow velocity, and reducing the flow rate is conducive to reducing the wear of the buried pipe by particles in the dense-phase area and prolonging the service life of the buried pipe; ③Increasing solid particles and gas The residence time in the incinerator is conducive to the combustion of sludge and the decomposition of dioxins; ④ In the case of ensuring the residence time of the gas, the height of the incinerator can be effectively reduced; Reduce the amount of fly ash, reduce the workload of the cyc...

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Abstract

The invention relates to a sludge drying and incineration combined treatment method with good treatment effect, wide sludge adaptability, and safe and stability system. To avoid agglomeration of mechanically dewatered sludge (k) in a fluidized bed dryer (6), a part of dried sludge (c) is premixed with the mechanically dewatered sludge (k) and then fed into the fluidized bed dryer (6). The dried sludge (c) is incinerated into a circulating fluidized bed incinerator (1) to generate superheated vapor. The superheated vapor is condensed to hot water in a heat exchange tube (6-2) of the fluidized bed dryer (6) and then recycled to the circulating fluidized bed incinerator (1). The arrangement of buried pipes (1-3) and fractional air supply inside the circulating fluidized bed incinerator (1) can effectively control the lower temperature of the circulating fluidized bed incinerator (1) to prevent deflagration of dried sludge. The entire system has no emission of pollutants such as unpleasant odor, acidic gases, heavy metals and dioxin; is safe and reliable; and can operate for a long time.

Description

technical field [0001] The invention relates to a sludge treatment method, which belongs to the technical field of environmental protection engineering. Background technique [0002] Sludge contains a large number of pathogenic bacteria, parasites, pathogenic microorganisms, and heavy metals such as arsenic, copper, chromium, mercury, and toxic and harmful substances. Untreated arbitrary discharge will not only cause serious pollution to the environment, but also be harmful to resources. serious waste. Sludge has become the most urgent and difficult problem in solid waste treatment in my country. Currently, sludge disposal methods are mainly landfill, composting and incineration. Sludge landfill will occupy a large amount of land and cost a lot of transportation costs, and the environment around the landfill will also deteriorate, and it is easy to be troubled by seepage water and odor; Heavy metals and harmful substances, heavy metal ions are easy to accumulate in soil a...

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Application Information

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IPC IPC(8): C02F11/12F23G7/00
Inventor 黄亚继仲兆平金保升肖睿钟文琪
Owner JIANGSU JINSHAN SOLID WASTE RESOURCE TECH
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