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Method of recycling impregnated sludge carbon to catalytically gasify and recycling sludge carbon for secondary conversion of tar

A secondary conversion and sludge charcoal technology, applied in pyrolysis treatment of sludge, tar processing through heat treatment, coke oven, etc., can solve the problems of reducing energy transmission efficiency, reducing gasification rate, equipment corrosion, etc., to achieve Energy and resource utilization, overcoming easy deactivation, and efficient pyrolysis conversion effects

Inactive Publication Date: 2017-01-25
BEIJING UNIV OF CHEM TECH
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  • Summary
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Problems solved by technology

The presence of tar reduces the gasification rate and energy transmission efficiency; during the transmission of gas, tar forms a viscous liquid due to the drop in temperature, which adheres to the surface of pipelines and equipment, resulting in pipeline blockage and Corrosion of equipment; moreover, when tar is burned, it is easy to produce carbon black, which will seriously damage the equipment using gas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, 70g of urban sewage treatment plant sludge is dried and crushed to a particle size of about 1-2mm, and the moisture content is lower than 1wt%. 2 After evacuating the air, start heating, and raise the temperature to 800°C at a heating rate of 20°C / min and keep it for 90min. Pyrolysis produces pyrolysis gas, pyrolysis liquid and sludge pyrolysis carbon; gas products are collected in a gas cabinet; pyrolysis liquid is separated by standing to obtain wood vinegar and tar products; sludge pyrolysis carbon accounts for about 44wt of raw materials %, can be reused as a catalyst. The sludge pyrolytic carbon was impregnated in the pre-prepared 0.5mol / L Ni(NO 3 ) 2 In the solution, immerse in a shaker (180r / min) for 3 days, then suction filter, put into an oven (105°C) and dry (24h), and the moisture content is less than 1wt%. Before the experiment, the impregnated sludge charcoal was put into a tube furnace with a nitrogen atmosphere, and the temperature was programme...

Embodiment 2

[0026] First, 70g of sludge from urban sewage treatment plants was dried and crushed to a particle size of about 1-2mm. 2 After evacuating the air, start heating, and raise the temperature to 800°C at a heating rate of 20°C / min and keep it for 90min. Pyrolysis produces pyrolysis gas, pyrolysis liquid and sludge pyrolysis carbon; the gas products are collected in a gas cabinet; the pyrolysis liquid is separated by standing to obtain wood vinegar and tar products; sludge pyrolysis carbon accounts for about 44% of the raw material %, can be reused as a catalyst. The sludge pyrolytic carbon was impregnated in the pre-prepared 0.5mol / L Fe(NO 3 ) 3 In the solution, immerse in a shaker (180r / min) for 3 days, then filter with suction, and put it into an oven (105°C) for drying (24h). Before the experiment, the impregnated sludge charcoal was placed in a tube furnace with an inert gas atmosphere, and the temperature was programmed to rise to 800°C at a rate of 20°C / min and roasted f...

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Abstract

The invention discloses a method of recycling impregnated sludge carbon to catalytically gasify and recycling sludge carbon for secondary conversion of tar. The method includes: pyrolyzing sludge, and performing impregnation pretreatment to obtain the impregnated sludge carbon; pyrolyzing to obtain impregnated pyrolytic carbon; adding a cracking reactor using the impregnated pyrolytic carbon as a catalyst to the lower reach of a sludge pyrolysis reaction system to perform high-temperature cracking on tar generated by primary sludge pyrolysis; converting the tar into gaseous compounds having low molecular weight and other products. The method recycles sludge pyrolysis carbon as the catalyst; through secondary pyrolysis conversion of the tar, tar content can be lowered obviously, gas yield and quality can be improved, and the method has the advantages of high efficiency and low cost. After the impregnated pyrolytic carbon as the catalyst is inactivated, the impregnated pyrolytic carbon can restore its activity through steam gasification reaction. The recycling process can be operated for more than 5 times cyclically.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency resource utilization of organic solid waste, and specifically relates to a method for recycling sludge charcoal for catalytic gasification while recycling sludge charcoal for secondary conversion into tar. Background technique [0002] With the acceleration of the urbanization process, the amount of sewage treatment has increased significantly, and the output of municipal sludge, a by-product of sewage treatment, has also increased sharply. As of the end of September 2015, a total of 3,830 sewage treatment plants have been built in cities and counties across the country, with a sewage treatment capacity of 162 million cubic meters per day, and the amount of sludge generated from wastewater treatment has reached about 35 million tons. my country's sludge treatment technology is relatively backward, mainly landfill, incineration and land use. Landfill and farmland utilization cannot complet...

Claims

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Application Information

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IPC IPC(8): C02F11/10C10B53/00C10C1/19C10G49/02
CPCY02W10/40C02F11/10C02F2103/001C10B53/00C10C1/19C10G49/02
Inventor 何艳峰姚瑶刘广青郝哲远
Owner BEIJING UNIV OF CHEM TECH
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