Oil shale semicoke fluidized combustion circulation gas heating technology

Abstract

An oil shale semicoke fluidized combustion and circulation gas heating technology is characterized by comprising the steps of sending oil shale semicoke greater than 0-15mm and residual gas into a fluid bed for low temperature combustion, heating circulation gas flowing in a diaphragm wall heat exchanger with a part of heat released by the combustion, discharging the other part of heat along with smoke generated by the combustion after exchanging heat with a tubular heat exchanger, allowing high-temperature ash and slag generated by the combustion of the semicoke to enter a fluid bed slag cooler for cooling, conveying cooled low-temperature ash and slag to a slag yard, allowing smoke to carry fly ash generated by the combustion to be discharged after exchanging the heat with a high-temperature air preheating tubular heat exchanger, a medium-high temperature gas heating tubular heat exchanger and a low-temperature air preheating tubular heat exchanger, mixing the circulation gas after heating cold circulation gas from a cold gas main line via the diaphragm wall heat exchanger with the cold gas, heating the mixed gas, and allowing the smoke temperature at an outlet of a hearth to be 850-950 DEG C, and hot circulation gas temperature at a hot gas outlet to be less than 720 DEG C.

Description

technical field [0001] The invention relates to the technical field of dry distillation of oil shale gas heat carrier. It is an oil shale semi-coke fluidized combustion cycle gas heating process, which can also be used for coal, waste tires, plastics, and biomass. Background technique [0002] Oil shale is an important energy resource. The reserves of oil shale resources in the world are very huge, and its reserves are as high as (10~15)×10 18 kJ, accounting for about (26-43) × 10 of the total amount of various energy sources in the world 18 35% of kJ, which is higher than the known reserves of crude oil in the world (8×10 18 ~10×10 18 kJ). [0003] The development and utilization of oil shale currently mainly adopts the carbonization furnace-based process route for carbonization and refining. The existing carbonization furnace-based process route uses gas heat carrier as the main heat carrier: the heat cycle gas is used as the main heating carrier to add to the middle o...

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Problems solved by technology

[0008] The purpose of the present invention is to substantially improve the existing process route of heating and circulating gas with gas combustion, and to combine the oil shale semi-coke fluidized bed combustion with the membrane wall heat exchanger in the furnace and the tail tube heat exchanger The oil shale semi-coke fluidized combustion cycle gas heating process is formed by organic combination, which not only effectively solves the combustion problem of oil shale dry distillation semi-coke, but also realizes the heating problem of gas heat carrier required by the gas heat carrier, and has a comprehensive utilization degree High, low cost, scientific and reasonable

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