External heat radiation type dry distillation system for oil shale

Abstract

The invention provides an external heat radiation type dry distillation system for oil shale. Combined with a traditional oil shale dry distillation process, heat accumulating type dry distillation furnaces are used, and the heat needed by oil shale dry distillation is provided through external heat radiation instead of prior gas heat carriers. The dry distillation furnaces are large in treatment amount and simple in structure, 20 or even 30 of the dry distillation furnaces can be assembled, and the every day treatment amount of one department can achieve 5000 to 8000 tons / department. Gas flows treated in subsequent oil recycling units and desulfurization units of the dry distillation furnaces are high caloric dry distillation gases produced by shale low-temperature dry distillation, the dry distillation gas volume flow rate at dry distillation furnace outlets is reduced and is 1 / 15 of the treatment amount of the traditional gas heat carrier process, and accordingly, loads and public and auxiliary facilities on subsequent oil recycling sections are reduced. Gas burns in dry distillation furnace combustion chambers to heat the oil shale indirectly, no heating furnace system exists, and the consumption amount of water, power and gas of dry distillation plants of same scales is saved by more than 50% than that through traditional gas heat carriers. The external heat radiation type dry distillation system has the advantages that the dry distillation furnace treatment amount is large, the process is simple, the supporting facilities are small, and the investment is saved.

Description

technical field [0001] The invention relates to a carbonization system and industry of oil shale, in particular to a carbonization process using an external heat radiation type carbonization furnace. Background technique [0002] The well-known shale oil production is a brown liquid product produced by the thermal decomposition of oil shale through the gas heat carrier method, and its organic matter is thermally decomposed, similar to natural petroleum. The abundance of alkanes and alkenes in shale oil can produce related high value-added chemicals. C6~10 fractions are used to produce plasticizers; C10~13 fractions are used as raw materials for detergents through biodegradation of linear dodecylbenzene; C14~18 fractions are used as raw materials for fatty alcohols and alkyl sulfide products; High-quality alkane fractions can be cracked to produce various low-molecular-weight olefins, and pitch and carbon fibers can also be obtained, becoming a chemical raw material that can...

AI Technical Summary

Problems solved by technology

In the process of producing shale oil through this kind of gas heat carrier carbonization furnace, there are problems of complex process flow, large investment and low thermal efficiency

And because the gas heat carrier retort furnace outlet gas volume includes self-produced retort gas, thermal cycle gas, water vapor, and shale oil-gas mixture gas, the gas volume is very large, resulting in some unnecessary auxiliary projects

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