Comprehensive utilization method of coal-based oil residue

Abstract

The invention relates to a comprehensive utilization method of a coal-based oil residue. According to the method, a heated solid heat carrier is mixed with the coal-based oil residue by using a solid heat carrier method; the oil residue is heated and gasified and partially pyrolyzed by using sensible heat of high-temperature solids; heavy liquefied oil in the coal-based oil residue is recovered after being pyrolyzed and gasified; the residual un-gasified residue enters a hot blast heater of a circulating fluidized bed to fully burn; one part of heat generated by combustion is used for heating the solid heat carrier; the other part of heat is recovered through a waste heat boiler. The comprehensive utilization method is small in investment, easy to implement, and high in overall efficiency.

Description

technical field [0001] The invention relates to the technical field of utilization of coal-based oil residue, in particular to a comprehensive utilization method of coal-based oil residue. Background technique [0002] The treatment of coal oil residue and tar residue is a worldwide technical problem. The direct liquefaction project of China Shenhua Coal-to-Liquid Chemical Co., Ltd. Ordos Coal-to-Liquid Branch Company produces tens of thousands of tons of by-product oil residue every year, which can only be treated by boiler co-firing at present. The main components of coal-based oil residue are heavy liquefied oil, bituminous substances, and unconverted coal. Among them, the content of heavy liquefied oil and asphalt accounts for about 50% of the oil residue, and the coal-based oil residue is burned by the boiler A large amount of expensive and useful components such as heavy liquefied oil and asphalt is a last resort. [0003] The development of coal-based oil residue co...

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Problems solved by technology

[0003] The development of coal-based oil residue comprehensive utilization technology is a current hot research topic. At present, the tar is recovered by extraction and filtration after dissolving the oil residue with an extractant. This process includes extraction, filtration or centrifugal separation, filter cake drying, and separation of the extract. And other processes, the process is cumbersome, the filtration equipment usually has a high failure rate, and the filtration is incomplete, and the filtered filter cake also contains a large amount of tar and extractant. If it is not recycled, it will cause unnecessary waste. However, the recovery process is more complicated. Large investment in equipment

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