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A process for producing combustible gas from sludge

A sludge and gas technology, applied in the direction of manufacturing combustible gas, sludge treatment, biological sludge treatment, etc., can solve the problems of high cost, low energy conversion rate, poor flammability, etc.

Inactive Publication Date: 2011-12-07
高增芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If coal, activated carbon or charcoal are used to adsorb water, heavy metals and harmful bacteria in sludge, the cost is high and the adsorption is not complete
If the sludge is directly burned after fermentation and drying, its flammability is very poor, and the energy conversion rate is low

Method used

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  • A process for producing combustible gas from sludge
  • A process for producing combustible gas from sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Take 75 tons of dewatered sludge (water content 70%-80%) discharged from the sewage plant, and add 20 tons of cotton straw powder (water content 15%-30%) as a moisture regulator, with a length of 1-5cm Add 5 tons of leavening agent to the thin bamboo pole section. Thorough mixing is carried out to form the fermented mass.

[0015] (2) Move the fermented material obtained in step (1) into a fermenter for aerobic fermentation. The bottom of the fermenter is provided with forced ventilation facilities, and the upper part is equipped with a material overturning machine. The tipping machine tipped over once a day, and the blower blasted it every 6 hours. Fermentation is completed in 4-7 days, so that the moisture content of the material reaches below 30%, and the harmful bacteria are killed to remove the stench. Sieve the fermented material to make fuel powder. Sieve out the larger sundries and leavening agent (thin bamboo pole section) and reuse after drying to remov...

Embodiment 2

[0018] (1) Take 70 tons of dewatered sludge (moisture content 70%-80%) discharged from the sewage plant, add 30 tons of sawdust (moisture content 15%-30%) as a moisture regulator and leavening agent, and fully mix to form fermented material.

[0019] (2) Pile the fermented material prepared in step (1) into strips for aerobic fermentation, turn over the pile 1-2 times a day, and complete the fermentation in 4-7 days, so that the moisture content of the material reaches below 40% and kills harmful bacteria Removes foul odors. The fermented material is sieved to remove impurities, and then air-dried to reduce the moisture content to below 30% to make fuel powder.

[0020] (3) The fuel powder obtained in step (2) is pressed into blocks to make fuel blocks, and stacked into strips for further air-drying. Put the air-dried fuel block into the gasification furnace, and carry out high-temperature or medium-temperature pyrolysis and gasification under the condition of restricted ven...

Embodiment 3

[0022] (1) Take 70 tons of dewatered sludge (water content 70%-80%) discharged from the sewage plant, add 25 tons of mushroom slag (water content 15%-30%) as a moisture regulator, and use peanut shells as a leavening agent Add 5 T. Thorough mixing is carried out to form the fermented mass.

[0023] (2) Move the fermented material obtained in step (1) into the fermenting field and pile it up into strips for aerobic fermentation. Turn the heap 1-2 times a day with a walking-type turning and throwing machine, and complete the fermentation in 4-7 days to increase the moisture content of the material. Drop below 30% and kill bad bacteria to remove bad smell. Sieve the fermented material to make fuel powder.

[0024] (3) The fuel powder obtained in step (2) is pressed into blocks to make fuel blocks, and stacked into strips for further air-drying. Put the air-dried fuel block into the gasification furnace, and carry out high-temperature or medium-temperature pyrolysis gasificatio...

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Abstract

The invention relates to a process for producing combustible gas from sludge. The invention belongs to the field of harmless resource utilization of sludge. Combustible gas is produced from sludge with a water content of 70%-80% and a large amount of harmful bacteria and heavy metals. The specific process is: add a moisture regulator and a fluffing agent to the dewatered sludge discharged from a sewage treatment plant and mix evenly to adjust the moisture content. To 40%-70%, aerobic fermentation is carried out under the conditions of regular overturning and forced ventilation. Kill harmful bacteria through fermentation, remove foul smell and reduce the moisture content to 20%-40%, after air-drying or directly briquetting to make fuel blocks, stack them into strips and store them for further air-drying. Put the air-dried fuel block into the gasification furnace, and carry out high-temperature or medium-temperature pyrolysis and gasification under the condition of restricted ventilation to generate mixed combustible gas for use in boilers and power generation, and its ash is used as building materials.

Description

technical field [0001] The invention relates to the field of resource utilization of organic solid waste, and in particular proposes utilizing sludge produced in a sewage treatment plant to pyrolyze and gasify to produce combustible gas for resource utilization. technical background [0002] At present, my country's sewage treatment plants discharge nearly 3-6 million tons of sludge every year, and the amount of discharge is increasing year by year. Due to its large volume, high water content, and harmful heavy metals and a large number of pathogenic bacteria, the sludge will cause secondary pollution to the environment if it is piled up or discarded. Therefore, the disposal of sludge is facing great difficulties. Domestic and foreign sludge disposal methods mainly include landfill, throwing into the sea, incineration, composting, etc. However, there are many limitations in these methods in practical applications. Therefore, with the enhancement of people's awareness of e...

Claims

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Application Information

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IPC IPC(8): C10J3/16C02F11/02C02F11/10
CPCY02W10/20Y02W10/40
Inventor 高增芳
Owner 高增芳
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