Low-temperature pyrolysis method for pulverized coal and oil shale powder and external heating vertical type descending low-temperature pyrolysis furnace

Abstract

The invention relates to a low-temperature pyrolysis method for pulverized coal and oil shale powder and an external heating vertical type descending low-temperature pyrolysis furnace so as to solve the problem that pyrolysis can not be carried out on powder in the prior art. The furnace is composed of a drying system, a heating pyrolysis system, a dust removing system, an oil-gas separating system and a coke quenching system; at first, the drying system is utilized for drying and preheating the pulverized coal or the oil shale powder with the diameter smaller than 0.6 cm to the temperature of 200 DEG C; the heating pyrolysis system with clean coal gas as fuel is utilized for indirectly heating the dried and preheated pulverized coal or oil shale powder to the temperature of 550 DEG C-600 DEG C to dissolve and separate semi-coke, oil gas and heating gas out; the dust removing system is utilized for removing dust in the oil gas and the heating gas; the oil-gas separating system is utilized for separating the clean coal gas and coal tar; finally, inert gas generated by the drying system and the coke quenching system are utilized for carrying out coke quenching on the semi-coke produced by the heating pyrolysis system. The furnace has the advantages that the pulverized coal and the oil shale powder can be fully utilized, safety performance is high, the energy efficiency ratio is high, the gas production rate is large, the gas production quality is good, the production capacity of the single furnace is high, and the production cost is low.

Description

technical field [0001] The invention relates to a coal pyrolysis method, in particular to a low-temperature pyrolysis method for pulverized coal oil shale powder and an external heat vertical down-going low-temperature pyrolysis furnace. Background technique [0002] With the gradual reduction of oil resources and the development of natural oil exploration and development to complex formations, remote areas and coastal continental shelves, the required investment will increase, and the international oil price will generally rise in the future. The country has higher and higher requirements for the comprehensive development, utilization and sustainable development of energy. As people pay more attention to the research and development of coal pyrolysis technology, some new technologies have been developed one after another. Compared with the direct combustion of coal, these new processes can produce products in three different forms: gas, liquid and solid. In fact, different ...

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Problems solved by technology

At present, there are more than 20 kinds of low-temperature pyrolysis technologies at home and abroad, and each technology has its own advantages and disadvantages. The existing devices and processes mainly can only process lump coal larger than 0.6cm

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