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Tandem type anhydration system for sludge by using remaining heat of flue gas from steam power plant

A technology of sludge drying and flue gas waste heat, which is applied in the direction of sludge treatment through temperature control, dehydration/drying/thickened sludge treatment, etc., which can solve high cost, large energy consumption, sludge reduction and resource utilization Deal with problems such as difficulty in implementation, achieve the effect of reducing moisture content and overcoming economic costs

Inactive Publication Date: 2005-10-26
ZHEJIANG UNIV
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Problems solved by technology

Practice shows that sludge drying is a necessary process to realize the harmless, reduction and resourceful treatment of sludge in sewage treatment plants. The sludge generated from sewage treatment plants is dehydrated mechanically, and the moisture content is generally 75%-85% %, through the drying process, if the moisture content of the sludge is reduced to below 20%, it will consume a lot of energy, making the cost of sludge drying higher, so that the sludge is harmless, reduced and Resource processing is difficult to implement
We have reduced the cost of sludge drying to the lowest level by establishing a sludge drying system that utilizes the waste heat of flue gas from thermal power plants, thus overcoming the high cost of traditional sludge drying and the difficulty in implementing sludge harmless and reducing sludge. Bottlenecks in Quantization and Resource Processing

Method used

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  • Tandem type anhydration system for sludge by using remaining heat of flue gas from steam power plant

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Embodiment Construction

[0010] As shown in the attached figure, the tandem sludge drying system utilizing the waste heat of the flue gas of the thermal power plant has a heating system, a sludge pretreatment system, a feeding system, a sludge drying and granulation system, and a dust removal and gas removal system. The heating system has a first induced draft fan 1 and a second induced draft fan 4. The first induced draft fan 1 passes the flue gas that passes through the electrostatic precipitator at 100-150°C through the first flue 2, and the flue gas volume is controlled by the first damper 3 , into the first rotary drying kiln 12 and the second rotary drying kiln 16 respectively, and the second induced draft fan 4 passes the flue gas that has passed through the electrostatic precipitator at 100-150°C through the second flue 5, and is driven by the second damper 6 Control the amount of flue gas and send it to the third rotary drying kiln 22 and the fourth rotary drying kiln 26 respectively; the slud...

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Abstract

The present invention discloses a series-connected sludge anhydration system by utilizing waste heat of steam-power plant smoke. Said series-connected sludge anhydration system includes heat supply system, sludge pretreatment system, feeding system, sludge anhydration and granulation system and dust-removing and gas-removing system.

Description

technical field [0001] The invention relates to a series sludge drying system which utilizes the waste heat of flue gas in a thermal power plant. Background technique [0002] In order to protect the living environment of human beings, urban domestic sewage and industrial wastewater must be treated by sewage treatment plants and discharged only after meeting the national sewage discharge standards. This will not only prevent the water environment from being polluted, but also enable water resources to be recycled. [0003] The urban sewage treatment system includes two parts: water treatment and sludge treatment. my country's treatment technology for urban domestic sewage and industrial wastewater mainly adopts imported technology from abroad. Most of the pollutants are transferred to the sludge, which determines that the sludge produced by the sewage treatment plant has a large amount and is enriched with high concentrations of pollutants and heavy metals. However, since th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12
Inventor 翁焕新苏闽华
Owner ZHEJIANG UNIV
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