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Method and device for preparing fuel by means of mixing coke powder with sludge from sewage plants

A technology of mixing device and sewage plant, applied in the field of comprehensive utilization of solid waste resources, can solve the problems of poor sludge resource utilization, low sludge addition, regional environmental pollution, etc. The effect of large and large sludge treatment capacity

Inactive Publication Date: 2016-07-06
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

Chinese patent application CN101250456A mentions a process for making synthetic fuel from sludge in urban sewage treatment plants. The sludge with a moisture content of 75-80% after pressure filtration and dehydration in urban sewage treatment plants is sent into a stable mixing tank, and the sludge is added Amount of 8-12% Ca0, stir for 10min, reduce the moisture content to 65%; send the sludge with moisture content reduced to 65% to the deodorizing mixing tank, add Fe 2 (S0 4 ), FeS0 4 , (NH 4 )S0 4 6H20, CuS0 4 and other chemicals to loosen and stabilize the sludge and mix it with other carbon-containing substances to make fuel. A variety of chemicals are added during the treatment process, and the process is complicated
Chinese patent CN1931753B discloses a sludge drying and incineration treatment method, through five steps of dehydration, granulation, mixing with dry sludge fine powder, drying, heating and incineration, and using special equipment to dry and incinerate the sludge to achieve sludge recovery. Harmless treatment, high energy consumption, cumbersome steps, and low sludge treatment volume
Chinese patent application CN1282781A proposes a method for preparing sludge briquettes. Coal powder, sludge, wood chips or powder, and desulfurization and deodorant are mixed in a wet state according to a certain component ratio, and then pressed into briquettes. The added sludge component replaces clay as the briquette binder. This method still uses coal as the main raw material, and the amount of sludge added is small, and the resource utilization effect of sludge is not good.
In order to prevent the coke powder from being blown away by the strong wind, some manufacturers use a large amount of water to wet it for a long time. As a result, the pollution is not reduced but water resources are wasted again
These shocking wastes have not only seriously caused a serious waste of resources, but also caused serious pollution of the regional environment.

Method used

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  • Method and device for preparing fuel by means of mixing coke powder with sludge from sewage plants

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Experimental program
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Effect test

Embodiment 1

[0033] First, mix 1 kg of sludge from urban domestic sewage plants with 1 kg of waste coke powder produced by the coking industry for 15 minutes; then add 0.2 kg of lime to the mixed material to digest and dry the sludge; then perform compression molding with a molding pressure of 200 kg / cm 2 , and then kept at room temperature for 12 hours to obtain about 2kg of environmentally friendly solid fuel. The obtained environmentally friendly solid fuel was tested according to the national standard solid biomass fuel calorific value determination method (GB / T30727-2014), and its high calorific value was 18.9MJ / kg.

[0034] A device for preparing fuel by mixing sewage plant sludge and coke powder, which uses the method described in Example 1, and the equipment flow chart is as follows figure 1 Shown: the waste coke powder produced by the coking industry is stored in the coke powder storage bin, the sludge generated by the sewage plant is stored in the sludge storage bin, and the lime...

Embodiment 2

[0037] First, mix 1 kg of sludge from urban domestic sewage plants with 4 kg of waste coke powder produced by the coking industry for 10 minutes; then add 0.25 kg of lime to the mixed material to digest and dry the sludge; then perform compression molding with a molding pressure of 100 kg / cm 2 , and then kept at room temperature for 8 hours to obtain about 5kg of environmentally friendly solid fuel. The obtained environmentally friendly solid fuel was tested according to the national standard solid biomass fuel calorific value determination method (GB / T30727-2014), and its high calorific value was 23.3MJ / kg.

Embodiment 3

[0039] First mix 1.2kg of urban domestic sewage plant sludge with 0.8kg of waste coke powder produced by the coking industry for 30 minutes; then add 0.16kg of lime to the mixed material for sludge digestion and drying; then perform compression molding with a molding pressure of 1000kg / cm 2 , and then kept at room temperature for 24 hours to obtain about 1.9kg of environmentally friendly solid fuel. The obtained environmentally friendly solid fuel was tested according to the national standard solid biomass fuel calorific value determination method (GB / T30727-2014), and its high calorific value was 17.8MJ / kg.

[0040] The advantage of the present invention is that according to the principle of "efficient recycling of resources, green and environmental protection", the municipal sludge and coke powder are directly mixed and granulated to prepare solid fuel, and the "turning waste into treasure" of municipal sludge and the efficient utilization of resources are truly realized. ...

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Abstract

The invention relates to a method and a device for preparing fuel by means of mixing coke powder with sludge from sewage plants.The method includes mixing the sludge from the sewage plants with the coke powder which is waste generated in the coking industry to obtain mixed materials; adding lime into the mixed materials and digesting and drying the sludge; carrying out compression molding on the sludge and curing the sludge under room-temperature conditions to obtain the environment-friendly solid fuel.The device comprises a coke powder storage bin, a sludge storage bin, a lime storage bin, metering devices, conveying devices, a primary mixing device, a secondary mixing device and a molding device.The method and the device have the advantages that the method and the device are low in investment and can become effective fast, processes are simple and flexible relatively, the device is low in running cost, high in practicality, treatment capacity and recycling and energy regeneration rate and thorough in harmlessness, ideas of recycling economy and low-carbon economy can be sufficiently embodied, the method and the device have obvious social, economical and environmental benefits, and the like.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of solid waste resources, in particular to a method and a device for preparing fuel by mixing sewage plant sludge and coke powder. Background technique [0002] With the modern expansion and development of cities, the social population is gradually concentrated in large and medium-sized cities, coupled with the significant improvement in sewage treatment efficiency, the output of urban sludge will increase rapidly, and the pressure on urban sludge treatment is increasing. At present, there are more than 400 urban sewage treatment plants in operation in my country, with a processing capacity of 1.136×10 10 t / a. The amount of sludge usually accounts for 0.3-0.5℅ of the amount of sewage, accounting for about 1-2℅ of the amount of sewage treatment. If advanced treatment is carried out, the amount of sludge will increase by 0.5-1 times. With the improvement of sewage treatment efficiency in my...

Claims

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Application Information

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IPC IPC(8): C10L5/46C02F11/00C02F11/14
CPCY02E50/10Y02E50/30Y02W10/37C10L5/46C02F11/00C02F11/14C02F2303/06C10L2290/08C10L2290/32
Inventor 余广炜汪印
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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