Method for preparing clean fuel through co-hydrothermal carbonization of sludge and coal slime

A technology of hydrothermal carbonization and clean fuel, applied in the direction of fuel, waste fuel, biofuel, etc., can solve the problems of ineffective improvement of sludge dehydration efficiency, reduction of cement hydrothermal carbon quality, and carbon content reduction, to achieve Realize the effects of efficient clean utilization, easy removal, improved calorific value and desulfurization rate

Pending Publication Date: 2021-09-24
SHANXI UNIV
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  • Description
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  • Application Information

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Problems solved by technology

The process of this method is complex and requires more equipment, and after hydrothermal carbonization of fermented sludge, the quality of cement hydrothermal carbon is reduced due to the reduction of carbon content.
[0005] Chinese invention patent application CN 108358421 A discloses a method for preparing solid fuel while removing moisture from sludge. After the sludge is thermally conditioned, it is dehydrated and thermally dried after adding a carburant. This method is not effective Improve sludge dehydration efficiency, which will cause a lot of energy consumption during thermal drying

Method used

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  • Method for preparing clean fuel through co-hydrothermal carbonization of sludge and coal slime
  • Method for preparing clean fuel through co-hydrothermal carbonization of sludge and coal slime
  • Method for preparing clean fuel through co-hydrothermal carbonization of sludge and coal slime

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Embodiment 1

[0024] A method for preparing clean fuel by co-hydrothermal carbonization of sludge and coal slime, comprising the steps of:

[0025] Sludge (Taiyuan City Jinyang Sewage Treatment Plant), and coal slime (Xiangyuan County Honglu Washing Coal Co., Ltd.), sludge and coal slime according to different mass ratios (respectively 3:7, 5:5, 7 : 3) mix and put into hydrothermal reaction kettle respectively, wherein the moisture content of sludge is 85%, and the moisture content of coal slime is 35%. The reaction temperature of hydrothermal carbonization is 240°C and kept for 2 hours. After the reaction is completed, after the reaction kettle is cooled to room temperature, the carbon slurry in the reaction kettle is dehydrated by a micro plate and frame filter press.

[0026] Result analysis: In order to study the synergistic effect of co-hydrothermal carbonization of sludge and coal slime, the measured data were compared with the theoretical value of physical mixing assuming separate hy...

Embodiment 2

[0036] A method for preparing clean fuel by co-hydrothermal carbonization of sludge and coal slime, comprising the steps of:

[0037] Put 1kg domestic sludge (Jinyang Sewage Treatment Plant, Taiyuan City) and 1kg coal slime (Honglu Washing Coal Co., Ltd., Xiangyuan County) into the hydrothermal reaction kettle, wherein the moisture content of the sludge is 80%, and the coal slime The water content is 35%. The reaction temperature of hydrothermal carbonization is 280°C and kept for 1 hour. After the reaction is completed, after the reaction kettle is cooled to room temperature, the carbon slurry in the reaction kettle is dehydrated through a micro plate and frame filter.

[0038] Result analysis: after coal slime and sludge are processed by the inventive method, its result is as shown in table 2:

[0039] Table 2 Theoretical calorific value, sulfur content and synergy coefficient of sludge, coal slime and their co-water thermal carbon

[0040]

[0041] According to the above ...

Embodiment 3

[0043] A method for preparing clean fuel by co-hydrothermal carbonization of sludge and coal slime, comprising the steps of:

[0044] Put 1kg of domestic sludge (Jinyang Sewage Treatment Plant, Taiyuan City) into a hydrothermal reaction kettle, wherein the sludge has a moisture content of 85%, add an appropriate amount of citric acid to adjust the pH to 3-4, and the reaction temperature of hydrothermal carbonization is Keep at 240°C for 1 hour. After the reaction is completed, after the reaction kettle is cooled to room temperature, the carbon slurry in the reaction kettle is dehydrated through a micro plate and frame filter press.

[0045] Result analysis: After coal slime and sludge are treated by the method of the present invention, the results are shown in Table 3. After adding citric acid for assistance, the calorific value of hydrothermal carbon is obviously improved, and this is because acidic conditions can promote the original hydrolysis, The carbonization process all...

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Abstract

The invention relates to the technical field of clean and efficient utilization of sludge and coal slime, in particular to a method for preparing clean fuel through co-hydrothermal carbonization of sludge and coal slime. In order to solve the problems of complex method, high energy consumption and low quality in the prior art, the novel hydrothermal carbon is prepared by taking sludge, coal slime and other solid wastes with huge yield as raw materials through a hydrothermal carbonization method, the obtained hydrothermal carbon is stable in quality and low in sulfur content, pathogenic microorganisms in the sludge are killed, part of heavy metals are dissolved out, and the sludge and the coal slime are subjected to co-hydrothermal carbonization, so that the synergistic effect of the sludge and the coal slime is realized. According to the invention, solid wastes such as sludge and coal slime with low calorific value and high water content are converted into clean fuel, and the method is a sludge and coal slime treatment method with huge potential.

Description

technical field [0001] The invention relates to the technical field of clean and efficient utilization of sludge and coal slime, in particular to a method for preparing clean fuel by co-hydrothermal carbonization of sludge and coal slime. Background technique [0002] According to the Bulletin of the Ministry of Housing and Urban-Rural Development, it is expected to reach 90 million tons in 2020. The composition of sludge is complex, containing a large number of pathogenic microorganisms, heavy metals, sulfur and nitrogen and other elements, and the sludge has a high water content and poor dehydration performance, which has become one of the most difficult problems in the world. my country's sludge treatment and disposal technology is still concentrated in conventional incineration, landfill and so on. However, although incineration can achieve sludge reduction, the SO produced in the incineration process 2 , NO X It will seriously pollute the environment; the landfill of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/46C10L5/04C10B53/00C10B57/06C01F11/10
CPCC10L5/46C10L5/04C10B53/00C10B57/06C01F11/10Y02E50/10Y02E50/30
Inventor 王宝凤杨晓阳邓瑞杨凤玲路广军程芳琴
Owner SHANXI UNIV
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