A method for preparing gasification coke by coupling treatment of oilfield tank bottom sludge

Abstract

The invention provides a method for preparing gasified coke from oil tank bottom sludge by coupling treatment. The method comprises the following steps: 1, mixing low-rank coal into coking coal in a high proportion to obtain mixed coal, and sequentially carrying out grinding, screening and drying treatments; 2, feeding into a pyrolyzing furnace for pyrolysis at low temperature to obtain oil gas and hot semi-coke, reclaiming oil gas to obtain coal tar, and drying raw material coal by using fixed gas as gas fuel; 3, heating and dehydrating the oil tank bottom sludge, adding partial hot semi-cokefor tempering treatment to obtain tempered oil sludge; 4, mixing and pyrolyzing the tempered oil sludge and the rest hot semi-coke; and 5, preparing the gasified coke by utilizing pyrolysate. According to the method, the gasified coke is prepared by utilizing mixed coal of high-proportionally mixed low-rank coal and the oil tank bottom oil sludge, an oil product with a high additional value is extracted, a novel way is opened for large-scale utilization of low-rank coal, the problem of over capacity in the coking industry can be effectively solved, the coking production cost can be reduced, and resource treatment of oil tank bottom oil sludge can be realized.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry and environmental protection, and in particular relates to a method for preparing gasification coke by coupling processing oil field tank bottom oil sludge. Background technique [0002] In my country's coal resources, low-rank coal represented by lignite / sub-bituminous coal accounts for more than 55%, with reserves reaching 561.2 billion tons. However, due to the high water content of low-rank coal, the direct combustion or gasification efficiency is low, and the existing technology cannot fully utilize its resource value, resulting in a huge waste of coal resources. Gasification is a leading technology for efficient and clean utilization of coal, and is the basis for the development of coal-based chemicals, liquid fuels, fuel cells, IGCC power generation, industrial fuel gas and polygeneration systems, synthetic natural gas (SNG) and hydrogen production. Gasification coke, that i...

AI Technical Summary

Problems solved by technology

[0004] In oil sludge, especially the high oil content tank bottom sludge deposited at the bottom of various storage tanks (oil storage tanks, oil-water separation tanks), in addition to mud sand and water, the petroleum hydrocarbon pollutants contained are mainly crude oil and aged crude oil , and the light oil and diesel components have the most separation value, while the heavy components such as waxy and asphaltene components contained in them have lower value, and it is difficult to use and convert them after separation, and there is no extraction component. quality utilization value

At present, there are many domestic treatment methods for oil sludge, such as solvent extraction, chemical cleaning, tempering-mechanical separation, pyrolysis, ultrasonic, etc. If the oil sludge is simply pyrolyzed, the treatment cost is high and the market promotion is difficult Big