CN101798163A - Method for accelerating microwave pyrolytic process of oily sludge by pyrolyzing residue thereof - Google Patents

Abstract

The invention discloses a method for accelerating the microwave pyrolysis process of oil sludge by using its own pyrolysis residue, that is, carrying out microwave pyrolysis of oil sludge or sludge under nitrogen-filled conditions, and then controlling microwave incineration at 700°C-850°C for 5- After 15 minutes, a solid microwave residue is obtained; then the microwave residue is uniformly mixed with the oil sludge or sludge according to 0.5-5% of the weight of the oil sludge or sludge, and then the oil sludge or sludge is subjected to microwave pyrolysis under nitrogen filling conditions. It can speed up the pyrolysis process of oil sludge or sludge, shorten the pyrolysis time, effectively save the energy consumption of oil sludge or sludge treatment, improve the treatment efficiency, and the residue after microwave pyrolysis can be recycled; and the method cost of the present invention is Low cost, economical, and can be widely used.

Description

A method for accelerating the microwave pyrolysis process of oily sludge by using its own pyrolysis residue

technical field

The invention relates to a method for microwave pyrolysis of oil sludge, in particular to a method for accelerating the microwave pyrolysis process of oil sludge by using cheap self-pyrolysis residues, which realizes the energy saving of oil sludge or sludge microwave pyrolysis, and improves the efficiency of microwave thermal decomposition. solution efficiency.

Background technique

The pyrolysis of oil sludge or sludge generally uses traditional methods for indirect heating pyrolysis. This method has the disadvantages of high energy consumption, easy coking, and the recovered liquid oil contains relatively high aromatic compounds. Due to microwave pyrolysis, there are dual effects of pyrolysis and microwave catalysis. Therefore, using microwave technology to pyrolyze oil sludge and sludge has become a new pyrolysis technology. However, due to the lack of sufficient substances beneficial to microwave adsorption in oil sludge or sludge, the process of microwave pyrolysis of oil sludge or sludge is very long, and even the pyrolysis of oil sludge and sludge cannot be achieved within a long period of time. temperature, low treatment efficiency, and particularly high energy consumption, it is impossible to realize the reduction and recycling of oil sludge and sludge. Usually, activated carbon is used as a microwave absorber, and the method of adding activated carbon is used to promote the microwave pyrolysis process, and the cost is relatively high. Based on this, there is an urgent need to use a new cheap microwave absorber, which can be added to oil sludge or sludge to speed up the microwave pyrolysis process, realize energy saving of oil sludge or sludge microwave pyrolysis, and improve microwave pyrolysis efficiency. method.

Contents of the invention

The purpose of the present invention is to solve the problems in the prior art and provide a cheap method for accelerating the microwave pyrolysis process of oil sludge by using its own pyrolysis residue.

In order to achieve the above purpose, the technical solution of the present invention is to carry out microwave pyrolysis of oil sludge or sludge under nitrogen-filled conditions, and then control microwave incineration at 700°C-850°C for 5-15 minutes to obtain solid microwave residue; then The microwave residue is evenly mixed with the oil sludge or sludge according to 0.5-5% of the weight of the oil sludge or sludge, and then the oil sludge or sludge is subjected to microwave pyrolysis under a nitrogen filling condition. In this way, oil sludge or sludge with added microwave residue will be efficiently pyrolyzed by microwave.

The method of the invention can accelerate the pyrolysis process of oil sludge or sludge, shorten the pyrolysis time, effectively save the energy consumption of oil sludge or sludge treatment, improve the treatment efficiency, and the residue after microwave pyrolysis can be recycled; and the present invention The inventive method is low in cost, economical and can be widely popularized and used.

Detailed ways

Example 1:

Firstly, the oil sludge was subjected to microwave pyrolysis under the condition of nitrogen filling, and then microwave incineration was carried out at 700°C for 15 minutes to obtain microwave residues; secondly, microwave incineration residues of oil sludge mass of 1.0% were added to the oil sludge with a water content of 70%, and the microwave incineration residue was added to the oil sludge with a water content of 70%. Under nitrogen conditions, the microwave pyrolysis time can be shortened to about 2 hours. If the addition of residue is increased to 5%, the microwave pyrolysis time of oil sludge with a water content of 70% can be shortened to less than 5 seconds, the microwave pyrolysis process of oil sludge basically disappears, and the microwave incineration process is directly entered, and finally residue is obtained. The residue can also be mixed with oil sludge in proportion to use.

Example 2:

Sludge was subjected to microwave pyrolysis under nitrogen-filled conditions, and then microwave incineration was carried out at 850°C for 5 minutes to obtain microwave residue; 1.0% of sludge mass was added to sludge with a moisture content of 70% to obtain microwave incineration residue. The time of microwave pyrolysis can be shortened to about 3 hours under the condition of nitrogen filling. If the amount of residue added is increased to about 4.5%, the microwave pyrolysis time of sludge with a moisture content of 70% can be shortened to within 30 minutes; after about 30 minutes of microwave pyrolysis, the temperature of the sludge continues to rise and enters microwave incineration Process; After incineration, microwave residues are obtained. The microwave residue can also be mixed with oil sludge in proportion for use.

Example 3:

Adding 1.0% of the sludge microwave incineration residue obtained in Example 1 to the sludge with a water content of 70% can also shorten the microwave pyrolysis time to about 2 hours under nitrogen filling conditions. If the addition of residue is increased to 5%, the microwave pyrolysis time of oil sludge with a water content of 70% can be shortened to less than 5 seconds, the microwave pyrolysis process of oil sludge basically disappears, and the microwave incineration process is directly entered, and finally residue is obtained. The residue can also be mixed with oil sludge in proportion to use.

Example 4:

Adding 1.0% of the sludge microwave incineration residue obtained in Example 2 to the sludge with a water content of 70% can also shorten the microwave pyrolysis time to about 3 hours under the condition of nitrogen filling. If the amount of residue added is increased to about 4.5%, the microwave pyrolysis time of sludge with a moisture content of 70% can be shortened to within 30 minutes; after about 30 minutes of microwave pyrolysis, the temperature of the sludge continues to rise and enters microwave incineration Process; After incineration, microwave residues are obtained. The microwave residue can also be mixed with oil sludge in proportion for use.

Claims (1)

1. A method for accelerating the microwave pyrolysis process of oil sludge by using its own pyrolysis residue, characterized in that the method is: carry out microwave pyrolysis of oil sludge or sludge under nitrogen-filled conditions, and then control it at 700°C-850°C Perform microwave incineration at ℃ for 5-15 minutes to obtain solid microwave residue; then mix the microwave residue with oil sludge or sludge evenly according to 0.5-5% of the weight of the oil sludge or sludge, and then treat the oil sludge or sludge under nitrogen-filled conditions Microwave pyrolysis.