Method and device for mixed gasification of coal and sludge

A sludge and sludge carbon technology, applied in the field of environmental engineering, can solve the problems of poor utilization stability and low mixing ratio, and achieve the effect of increasing the mixing rate and reducing the amount

Active Publication Date: 2021-11-02
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
  • 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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  • Method and device for mixed gasification of coal and sludge
  • Method and device for mixed gasification of coal and sludge
  • Method and device for mixed gasification of coal and sludge

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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 and analyzed under the heating of the high-temperature bed material; the mixture of sludge carbon and bed material and volatile matter generated by the devolatilization are in the expansion section of the upper bed 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 ...

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 method and device for mixed gasification of coal and sludge. The sludge and coal undergo (1) sludge devolatilization: (2) gas-solid separation; (3) volatile gas-water separation; (4) ) co-gasification of sludge carbon and coal to finally obtain combustible gas; the device includes an ascending bed, a descending bed inside the ascending bed, a gas-solid separation device, and a gas-water separation device. The present invention is applicable to the co-gasification resource / energy utilization of sludge and coal produced by municipal sewage treatment with relatively high water content; compared with the prior art, the co-utilization process of sludge and coal is stable, and the mixing rate can be greatly improved. It is helpful to solve the current problem of difficult sludge energy utilization, and realize the reduction, stabilization, resource utilization and energy utilization of sludge.

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 Patents(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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