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Resource utilization method of sludge based on thermal hydrolysis-pyrolysis carbonization

A technology of pyrolysis carbonization and thermal hydrolysis, applied in the fields of pyrolysis treatment of sludge, chemical instruments and methods, water/sludge/sewage treatment, etc. Higher problems, achieve the effect of high level of sludge energy utilization, low operating cost, and overcome excessive moisture content

Inactive Publication Date: 2018-08-21
浙江合泽环境科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a sludge resource utilization method based on thermal hydrolysis-pyrolysis carbonization, which overcomes the current problems of high energy consumption in the sludge carbonization process of sewage treatment plants and irregular sludge biochar resource utilization methods , in order to realize the reduction, stabilization, harmlessness and comprehensive utilization of resources in sewage treatment plant sludge

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  • Resource utilization method of sludge based on thermal hydrolysis-pyrolysis carbonization
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  • Resource utilization method of sludge based on thermal hydrolysis-pyrolysis carbonization

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Embodiment 1

[0035] The moisture content of the sludge in an urban sewage treatment plant is 78% after mechanical dehydration. After the wet sludge is preheated by the preheater, the temperature reaches 83°C. The preheated sludge is sent to the sludge thermal hydrolysis reactor, and the The reaction temperature is 185°C, the pressure is 1.8MPa, and the ribbon-screw agitator in the reactor is stirred at 80rpm for 1.2h to discharge the material to obtain a thermal hydrolysis product, and the moisture content drops to 37% after passing through a high-dry sludge filter press. %, after further natural heap drying for 2 days, the moisture content drops to 28%, then the dried solid product is broken, and 0.2% potassium hydroxide and 0.85% potassium carbonate activator of sludge dry weight are added to mix and granulate evenly. Send it into a rotary controllable pyrolysis carbonization furnace, control the temperature rise rate of the carbonization furnace to 7°C / min, and the pyrolysis temperature ...

Embodiment 2

[0041] The water content of the sludge in a mixed urban and industrial sewage treatment plant is 82% after mechanical dehydration. After the wet sludge is preheated by the preheater, the temperature reaches 88°C, and the preheated sludge is sent to the thermal hydrolysis reaction of the sludge Reactor, at a reaction temperature of 210°C and a pressure of 2.2MPa, the ribbon-screw agitator in the reactor stirred and reacted for 1.4 hours at 120rpm and discharged to obtain a thermal hydrolysis product. After passing through a high-dry sludge filter press, the moisture content was Reduce to 32%, further natural heap drying after 2 days, the moisture content drops to 26%, then break the dried solid product, add 0.1% potassium hydroxide and 0.25% potassium carbonate activator of sludge dry weight and mix evenly Granulate and send into the rotary controllable pyrolysis carbonization furnace, control the temperature rise rate of the carbonization furnace to 8.5°C / min, and the pyrolysis...

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Abstract

The invention discloses a resource utilization method of sludge based on thermal hydrolysis-pyrolysis carbonization. The method includes the steps of: (1) transporting dehydrated sludge to a sludge preheater; (2) sending the preheated sludge into a sludge thermal hydrolysis reaction kettle; (3) subjecting the thermal hydrolysis product to solid-liquid separation to obtain thermal hydrolysis filtrate and a solid product; (4) carrying out natural heap drying, crushing, activation and granulation on the solid product successively, then conveying the product to a rotary controllable pyrolysis carbonization furnace by a spiral conveyer, and conducting high-temperature rapid pyrolysis to obtain biochar, tar and high-temperature waste gas, introducing the high-temperature waste gas into the sludge preheater, and subjecting the biochar to resource comprehensive utilization; and (5) subjecting the thermal hydrolysis filtrate to anaerobic fermentation, and using the generated biogas as the fuelof the pyrolysis carbonization furnace. The method provided by the invention overcomes the problems of high energy consumption of the sludge carbonization process and nonstandard resource utilizationmethod of sludge biochar in sewage treatment plants at present, and realizes reduction, stabilization, harmless and resource comprehensive utilization of sludge in sewage treatment plants.

Description

technical field [0001] The invention relates to the field of resource utilization of sewage treatment plant sludge, in particular to a comprehensive utilization method of thermal hydrolysis of sludge, carbonization of sludge pyrolysis and energy. Background technique [0002] According to the statistics of the Ministry of Housing and Urban-Rural Development, as of the end of December 2016, a total of 2,248 sewage treatment plants have been built and operated in cities across the country, and the annual production of wet sludge (with a moisture content of 80%) in urban sewage treatment plants will reach more than 40 million tons. The amount of sludge generated is about 95,000 tons per day. With the improvement of sewage treatment capacity, the amount of sludge will increase significantly. It is predicted that by 2020, the annual amount of sludge generated by my country's urban sewage treatment plants will reach 60-90 million tons. The sludge of urban sewage treatment plants ha...

Claims

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Application Information

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IPC IPC(8): C02F11/10C10B53/00C10B1/00C02F11/00C02F11/04C04B33/00C04B38/06C04B14/02C02F101/30C02F101/20
CPCC02F11/004C02F11/04C02F11/10C02F2101/20C02F2101/30C02F2209/02C02F2209/03C02F2209/44C02F2303/06C04B14/022C04B33/00C04B38/009C10B1/00C10B53/00C04B38/068Y02W10/40
Inventor 顾立锋丁志农丁康
Owner 浙江合泽环境科技有限公司
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