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Method for preparing pyrolysis oil and synthesis gases by pyrolysis of sludge

A technology for thermal cracking and cracking of oil, applied in the field of chemical engineering, can solve problems such as heating and difficulty, and achieve the effect of shortening time, saving energy consumption, and improving economic feasibility and technical feasibility

Inactive Publication Date: 2014-06-04
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of microwave heat-absorbing substances in sludge, it is difficult to heat it to the pyrolysis temperature by microwave

Method used

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  • Method for preparing pyrolysis oil and synthesis gases by pyrolysis of sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 100 parts by mass of dehydrated municipal domestic sludge (moisture content 85%) and 10 parts by mass of bamboo activated carbon powder and 5 parts by mass of Ni 2 o 3 Stir and mix the powder evenly, and send it into the microwave heating device. Before the start of microwave heating, feed nitrogen into the microwave heating device to replace the air in the original microwave heating device, and maintain a nitrogen flow rate of 1L / min per kilogram of sludge after the heating reaction starts. Using microwaves with a frequency of 2450MHz±50MHz, under the above inert reaction atmosphere conditions, the sludge heats up rapidly at a rate of about 40°C / min during the 100-400°C heating stage, and the final temperature rises to 700°C, and then continues heating for 10 minutes . The pyrolysis gas produced by microwave heating sludge is cooled to about 40°C through a condensing device, and the resulting water / cracking oil mixture and non-condensable gas are recovered separately...

Embodiment 2

[0022] Stir and mix 100 parts by mass of dehydrated municipal domestic sludge (water content 55%) with 5 parts by mass of coconut shell activated carbon powder and 10 parts by mass of CaO powder, and send them into a microwave heating device. Before the start of microwave heating, feed nitrogen into the microwave heating device to replace the air in the original microwave heating device, and maintain a nitrogen flow rate of 2L / min per kilogram of sludge after the heating reaction starts. Using microwaves with a frequency of 2450MHz±50MHz, under the above-mentioned inert reaction atmosphere conditions, the sludge is rapidly heated at a heating rate of about 30°C / min during the heating stage of 100-400°C, and the final temperature rises to 600°C, and then continues heating for 20 minutes . The pyrolysis gas produced by microwave heating sludge is cooled to about 30°C through a condensing device, and the resulting water / cracking oil mixture and non-condensable gas are recovered s...

Embodiment 3

[0024] With 100 parts by mass of dried sludge (moisture content 10%) and 20 parts by mass of the sludge-based activated carbon powder obtained in Example 1 and 2 parts by mass of Ni 2 o 3 Stir and mix the powder evenly, and send it into the microwave heating device. Before the start of microwave heating, feed nitrogen into the microwave heating device to replace the air in the original microwave heating device, and maintain a nitrogen flow rate of 3 L / min per kilogram of sludge after the heating reaction starts. Using microwaves with a frequency of 2450MHz±50MHz, under the above-mentioned inert reaction atmosphere conditions, the sludge is heated up rapidly at a rate of about 35°C / min during the heating stage of 100-400°C, and the final temperature rises to 650°C, and then continues heating for 15 minutes . The pyrolysis gas generated by microwave heating sludge is cooled to about 50°C through a condensing device, and the resulting water / cracking oil mixture and non-condensa...

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Abstract

The invention provides a method for preparing pyrolysis oil and synthesis gases by pyrolysis of sludge. The method is characterized by comprising the following steps of evenly mixing activated carbon and a pyrolysis catalytic agent in dehydrated or air-dried sludge with over 60% of the dry basis organic content; loading an obtained mixture to a microwave heating device and performing pyrolysis reaction by microwave heating under an atmosphere of inert gases; and feeding gases generated by the pyrolysis reaction to a condenser to collect the pyrolysis oil, water and non-condensing gases used as the synthesis gases. By means of the method, pyrolysis of the sludge can be rapidly achieved, compared with traditional heat conduction heating sludge pyrolysis methods, the method has the advantages that sludge pyrolysis time is greatly shortened, energy consumption is saved, simultaneously, more pyrolysis oil and synthesis gases can be generated, generated sludge-based activated carbon can be recycled, and hardly any waste and pollutants are discharged.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering, and in particular relates to a method for preparing pyrolysis oil and synthesis gas from pyrolysis sludge. Background technique [0002] Sludge thermal cracking technology is heating under the condition of no air or lack of oxygen to chemically crack the organic matter in the sludge to generate bio-oil (pyrolysis oil), water, syngas (non-condensable gas, mainly CO and H2 ) and sludge-based activated carbon (that is, sludge pyrolysis residue) technology can realize the full resource utilization of sludge with almost no pollutant discharge. [0003] In the past 30 years, sludge pyrolysis technology has been continuously researched, most of which are based on traditional heat conduction heating methods, mainly including fluidized bed pyrolysis, fixed bed pyrolysis, rotary kiln pyrolysis and electric furnace pyrolysis, etc., and these The technology has already been practiced in develop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/10C10B53/00C10G1/00C10J3/00
CPCY02W10/40
Inventor 于颖孙冰严志宇
Owner DALIAN MARITIME UNIVERSITY
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