System and method for cracking oily sludge

Abstract

The invention discloses a system and method for cracking oily sludge; dry and wet oily sludge generated by a gas field and an oil field is used for producing light oil, cement building material raw materials, high-grade highway subgrade materials and oil area highway subgrade materials through a thermal cracking process, and harmless treatment is carried out, so that a new way is opened up for reasonable utilization of the oily sludge; the invention provides a whole set of complete oily sludge treatment steps and matched equipment aiming at oily sludge characteristic design. Equipment used in the method is improved in a targeted manner, and a mode of three-stage internal radiation heating of an oil sludge updating surface is adopted, so that the coking problem is effectively solved, and safe and normal operation of the equipment in the process is guaranteed; the invention provides a reliable process composition, so that normal operation of treatment equipment is ensured while the oily sludge is treated to be qualified. The whole set of process adopts modular design, is easy to assemble, overhaul, upgrade and reform, and also has the characteristics of low maintenance cost and high automation degree.

Description

technical field [0001] The invention belongs to the technical field of oily sludge treatment, in particular to a system and method for cracking oily sludge. Background technique [0002] Oily sludge is oily solid waste produced in the process of petroleum exploration, mining, refining, tank cleaning, storage and transportation, and oily sewage treatment. It has the characteristics of large output, high oil content, high heavy components, and few comprehensive utilization methods. Difficult to deal with and other characteristics. Oily sludge contains a large amount of toxic and harmful substances. If it is not treated in time, it will inevitably cause serious pollution to the surrounding soil, water, air and its biosphere. [0003] Due to the relatively backward exploitation technology of oil and gas fields in our country, in the past, the oil sludge produced in the mining process was mostly treated by landfilling, and some oil and gas fields were simply discarded in designa...

AI Technical Summary

Problems solved by technology

However, because the pyrolysis temperature is higher than that of drying, the coking of the furnace body is more serious, which affects the pyrolysis effect and the stable operation of the facility.

At present, the conventional oily sludge thermal cracking resource treatment technology has defects such as serious secondary pollution, high cost, complex equipment, easy coking, and poor reliability, which restricts its popularization and application, especially the high oil content of the solid residue after treatment. Co-processing needs to be carried out again. At present, there is no complete set of thermal cracking equipment with an oil content of less than 0.3% in the sludge after treatment and stable operation in China.

[0007] Chinese patent application CN108911456A provides a new oily sludge treatment method and system. Although this patent also cracks oily sludge through three-stage cracking, first of all, the three-stage cracking methods are different when the two are thermally cracked. This patent The cracking of oil sludge is more thorough through the radiant heating tube at a higher temperature, and the third-stage cracking of this patent is to treat the oil sludge generated after the second-stage cracking, so as to carbonize the oil sludge and form dispersed powder Particles, the patent does not treat the oily sludge thoroughly and cannot meet the requirements of environmental protection; at the same time, the patent does not provide better treatment for the gas phase substances produced by the oily sludge. This patent cracks the cracked gas produced after the oily sludge Purify and filter, store the purified and desulfurized pyrolysis gas, and use it as an energy supply for combustion in the burner, which is conducive to energy recovery and utilization, and meets the requirements of environmental protection; finally, this application uses a hydraulic ejector to crack the oil sludge The resulting oil-gas-water mixture is injected into the cracked gas purification separator, so that the oil-gas-water mixture can smoothly enter the cracked gas purification separator for separation, making the separation of the oil-gas-water mixture more thorough. This patent does not involve this Technical solution, but also did not give the enlightenment description of the technical solution

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