Coal and sludge mixed gasification method and device

A technology of sludge and sludge carbon, which is applied in the field of environmental engineering, can solve the problems of poor utilization stability and low blending ratio, and achieve the effect of increasing the blending rate and realizing the reduction

Active Publication Date: 2021-01-01
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned technical problems of low blending ratio and poor utilization stability in the process of co-utilization of sludge and coal in the prior art, and to provide a method that makes full use of the characteristics of high calorific value and stable combustion of coal, which can make sludge Method and device for converting sludge carbon and volatile matter with medium calorific value and low volatile matter from devolatilization first, and then co-gasifying sludge carbon and coal

Method used

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  • Coal and sludge mixed gasification method and device
  • Coal and sludge mixed gasification method and device
  • Coal and sludge mixed gasification method and device

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Embodiment 1

[0024] refer to Figure 1 to Figure 3 , is a method and device for mixed gasification of coal and sludge, the method comprising the following steps:

[0025] (1) Sludge devolatilization: Dried sludge with a moisture content of 35%, the sludge after simple crushing treatment forms a relatively uniform powder, and the crushed sludge enters the ascending bed 1 from the bottom of the ascending bed 1, and in the ascending bed 1 is mixed with the high-temperature bed material circulated from the lower bed 2, and the sludge is volatilized under the heating of the high-temperature bed material; 12 Automatic separation, the mixture of separated sludge carbon and bed material enters the descending bed 2;

[0026] (2) Gas-solid separation: the volatile matter produced by the sludge is separated from the gas-solid by the gas-solid separation device 3, and the solid product collected by separation is recycled to the down-bed 2;

[0027] (3) Gas-water separation of volatile matter: the vo...

Embodiment 2

[0040] Referring to Example 1, the difference between Example 2 and Example 1 is that the addition ratio of sludge to coal in the co-gasification process is 20:80. The sludge devolatilization temperature in the ascending bed 1 is set at 400°C. When the sludge enters the ascending bed 1, it reaches the temperature in the furnace within 1-2 seconds, and the heating rate is about 300°C / s. The co-gasification temperature of sludge carbon and coal was set at 1300°C. The gasification equivalent ratio consumed by gasification in step (4) is set at 0.35. The gasification agent supplied is air.

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Abstract

The invention discloses a coal and sludge mixed gasification method and device. Sludge and coal are subjected to the following steps: (1) sludge volatile component removal; (2) gas-solid separation; (3) volatile component gas-water separation; and (4) co-gasifying the sludge carbon and coal to finally obtain the combustible gas. The device comprises an ascending bed, a descending bed in the ascending bed, a gas-solid separation device and a gas-water separation device. The method is suitable for co-gasification resource/energy utilization of sludge and coal generated by treatment of municipalsewage with relatively high water content; compared with the prior art, the sludge and coal co-utilization process is stable, the mixing rate can be greatly improved, the problem that sludge energy utilization is difficult at present is solved, and reduction, stabilization, recycling and energy utilization of sludge are achieved.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a method and a device for energy utilization of sludge generated in a sewage treatment process and coal together. Background technique [0002] According to statistics, as of 2020, my country's urban sewage treatment capacity is about 210 million tons per day, and the actual operating load is about 70%. According to the average sludge production rate of three ten thousandths in the sewage treatment process, the sludge production in my country in 2020 will be More than 60 million tons / year or 160,000 tons / day. "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB 18918-2002) requires that the moisture content of sludge from sewage treatment plants should be less than 80%. At present, the mainstream treatment method of sludge in my country is sanitary landfill. "Sludge Disposal of Urban Sewage Treatment Plants Sludge Mixed with Landfill Mud" (GB / T ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/48C10J3/50C10J3/52C10J3/72C10J3/84
CPCC10J3/48C10J3/50C10J3/52C10J3/723C10J3/84C10J2300/0906C10J2300/0923C10J2300/093C10J2300/0956C10J2300/0959C10J2300/0976C10J2300/1807
Inventor 王小波赵增立刘安琪魏国强钟慧琼黄振李海滨
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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