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Treatment method for heating and drying sludge by microwave and low-temperature smoke gas

A microwave heating and sludge technology, applied in the direction of sludge treatment, sludge treatment, dehydration/drying/thickened sludge treatment through temperature control, to achieve the effect of increasing effective utilization, not sacrificing power generation efficiency, and high comprehensive benefits

Inactive Publication Date: 2008-01-09
郭银飞
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Problems solved by technology

[0005] The existing Chinese patent application No. 200410083830.1 "A Sludge Drying and Recycling Process" provides a drying process that combines microwave technology, aerobic fermentation technology and heat pump drying technology, but the power consumption reaches 450kwh / More than T, based on 0.8 yuan / kwh, the sludge treatment cost will reach more than 360 yuan / ton; and the series of invention patents (patent application No. Use the waste heat of boiler flue gas with a temperature above 150°C for drying and disinfection, but the temperature of waste heat of flue gas in existing thermal power plant boilers has gradually decreased to below 138°C with the improvement of process technology

Method used

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Embodiment Construction

[0022] The present invention is described further below:

[0023] Processing technology of the present invention carries out according to the following steps:

[0024] (1) Put the sludge with a moisture content of about 76% to 78% after mechanical dehydration in the sewage treatment plant into the first rotary kiln, and at the same time, introduce the flue gas with a temperature below 138°C into the rotary kiln with an induced draft fan to make the sludge Heating to 70℃~75℃ in the rotary kiln;

[0025] (2) Put the sludge with the above temperature at 70°C to 75°C and a water content of about 76% to 78% into an industrial microwave processor for wall breaking, sterilization, and antivirus treatment, and the treatment time is 1 to 3 minutes;

[0026] (3) putting the sludge treated above into a mechanical filter press for mechanical dehydration, and the water content of the sludge is reduced to about 60% to 65%;

[0027] (4) Send the sludge with a moisture content of 60% to 65%...

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Abstract

This invention discloses a method for drying sludge from waste-water treatment plants of urban domestic sewage or from chemical plants or other industries. In this inventive method, waste-sludge is first dried by using exhaust gas from boiler with its temperature lower than 138deg.C, reducing the water content to about 40%. Together with micro-wave technique, the waste-sludge is dried and formed into hard pellets with the size of 1-8mm. Based on the different behavious of the sludge at different periods, provided are the combinations of exhaust gas heating and micro-wave heating. The utilization of this inventive method of waste-sludge treatment can achieve low cost, no energy-consumption and reutilization of wastes.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for drying sludge by utilizing microwave drying and waste heat of boiler low-temperature flue gas. Background technique [0002] With the development of the economy and the improvement of living standards, the urban domestic sewage and industrial wastewater, which are constantly increasing, are purified by sewage treatment plants and discharged after reaching the national sewage discharge standards. The amount of sludge produced will also increase significantly, and will Most of the pollutants in the sewage are transferred to the sludge. The common characteristics of these sludges are high organic content, fine particles, flocculent colloidal structure, high hydrophilicity, but poor dehydration performance, containing a large number of bacteria and pathogens, and some factory sludge even contains heavy metals. [0003] The sludge output is huge, the ris...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/18C02F11/00
Inventor 郭银飞
Owner 郭银飞
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