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Oil producing technology for co-pyrolysis of municipal sewage sludge and agricultural waste

A technology of agricultural waste and urban sludge, which is applied in the field of co-pyrolysis of urban sludge and agricultural waste to oil, can solve the problems of difficult economic support, high investment in equipment, large one-time investment, etc., and achieve the elimination of secondary Pollution, obvious economic benefits, and improved economy

Inactive Publication Date: 2010-02-10
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sludge incineration was once very popular. However, sludge incineration has limited its use due to large one-time investment, high investment in equipment, high operating costs, the production of highly toxic substances such as dioxin, and the need for reprocessing of incineration ash.
Due to the complexity of the incineration equipment, the construction and operation costs are much higher than the general sludge treatment method, and the incineration cost is 2 to 4 times that of other processes (the comprehensive treatment cost of a ton of dry sludge is about 700 to 1,000 yuan), which is difficult to support economically. Therefore, in practice, it cannot be promoted and applied

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Municipal sludge (dry basis): 70%;

[0013] Corn stover (dry basis): 30%;

[0014] Mix 30% corn stalks (dry basis) and 70% municipal sludge (dry basis) evenly, then dry the mixed material at about 150°C by drying equipment, the moisture content of the material is 12%, and the dried material is Heat the air in the pyrolysis furnace to about 400°C and keep the temperature constant for about 20 minutes, export the pyrolysis gas generated in the pyrolysis furnace, and condense it through the condensing equipment to obtain oil, water-soluble liquid and non-condensable gas; The solid product discharged from the process can be used as activated carbon adsorbent after being cooled and ground.

Embodiment 2

[0016] Municipal sludge (dry basis): 80%;

[0017] Wheat straw (dry basis): 20%;

[0018] Mix 20% wheat straw (dry basis) and 80% municipal sludge (dry basis) evenly, then dry the mixed material at about 170°C through drying equipment, and the material moisture is 8%, and the dried material is heated Heat the air in the pyrolysis furnace to about 500°C and keep the temperature constant for about 15 minutes, export the pyrolysis gas generated in the pyrolysis furnace, and condense it through the condensing equipment to obtain oil, water-soluble liquid and non-condensable gas; The discharged solid product can be used as activated carbon adsorbent after being cooled and ground.

Embodiment 3

[0020] Municipal sludge (dry basis): 40%;

[0021] Straw (dry basis): 60%;

[0022] Mix 40% rice straw (dry basis) and 60% municipal sludge (dry basis) evenly, then dry the mixed material at about 120°C by drying equipment, the material moisture is 17%, and the dried material is heated Heat the air in the pyrolysis furnace to about 600°C and keep the temperature constant for about 10 minutes, export the pyrolysis gas generated in the pyrolysis furnace, and condense it through the condensing equipment to obtain oil, water-soluble liquid and non-condensable gas; The discharged solid product can be used as activated carbon adsorbent after being cooled and ground.

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Abstract

The invention discloses an oil producing technology for co-pyrolysis of municipal sewage sludge and agricultural wastes, which comprises the following steps: mixing the municipal sewage sludge and theagricultural wastes in proportion; heating the mixture of the municipal sewage sludge and the agricultural wastes for pyrolyzing under the condition of air insulation after drying the mixture properly, and then forming pyrolysis gas product and pyrolysis solid product; and then carrying out condensation and cooling on the pyrolysis gas product to obtain oil-soluble liquid and water-soluble liquidand non-condensable combustible gas, the oil-soluble liquid and the water-soluble liquid can be further processed into useful down-stream product, and the non-condensable combustible gas is used forsupplying heat for pyrolyzing furnace; grinding on the pyrolysis solid product as an active carbon adsorbent. The oil producing technology of the invention solves the self-supporting problem of the heat energy needed in sewage sludge pyrolysis, changes waste into wealth, can meet balance of self-energy, and obtains fuel oil and water-soluble organism, and carbon powder of the solid product also can be taken as an adsorbent which can be widely used in the following fields, such as sewage treatment, soil improvement and flower gardening and the like. The oil producing technology of the inventionalso has the characteristics of reduction, recycling, high value-added and low cost of the municipal sewage sludge.

Description

technical field [0001] The invention relates to a recycling of urban sludge and agricultural waste (such as straw, rice husk, bagasse, etc.), in particular to a process for co-pyrolysis of urban sludge and agricultural waste to produce oil. Background technique [0002] Municipal sludge is a sedimentary substance produced in the process of urban sewage treatment. The amount of sludge usually accounts for about 0.5% to 0.7% (volume) of sewage, or about 1% to 2% (mass) of sewage treatment. If the depth of sewage treatment increases, the amount of sludge will sometimes increase by 0.5 to 1 times. Municipal sludge contains solid particles such as mud sand, fibers, animal and plant residues, microorganisms, and coagulated flocs, as well as many trace elements and organic matter such as nitrogen and phosphorus, as well as a large number of pathogens, parasites (eggs, etc.) ) and a certain amount of heavy metals and various toxic and harmful organic substances. [0003] In the pa...

Claims

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Application Information

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IPC IPC(8): C11B13/00
CPCY02W30/74
Inventor 张双全
Owner CHINA UNIV OF MINING & TECH
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