A comprehensive utilization system and process of straw waste coupled with oil shale

Abstract

The invention relates to a comprehensive utilization system and process of straw waste coupled with oil shale, including a first heat exchanger, a second heat exchanger, a third heat exchanger, a steam turbine, a chimney, and a coupled biomass dry distillation unit and oil Shale retort unit. Compared with the prior art, the present invention separates biomass from oil shale carbonization and then couples them, uses biomass volatiles to catalyze the oil shale carbonization process, and reconstructs the thermochemical conversion path of the process, effectively improving the The carbonization efficiency of oil shale and the resource utilization of biomass waste are realized. At the same time, the biomass carbonization furnace, oil shale carbonization furnace and circulating fluidized bed boiler are organically combined, and resources, environment and social and economic benefits are comprehensively considered. Realize the scientific utilization of oil shale and biomass waste.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of oil shale and biomass resources, and relates to a straw waste coupled oil shale comprehensive utilization system and process. Background technique [0002] Oil shale is a black or brown solid rock with high ash content and low combustion calorific value. It is mainly composed of inorganic minerals and organic substances and belongs to combustible organic ore bodies. The proven reserves of shale oil in the world are more than 400 billion tons (calculated according to the in-situ reserves of oil shale), which is much higher than the proven recoverable reserves of crude oil in the world. In addition, with the further development and utilization of oil shale resources, this number will continue to increase. As one of the few countries with large reserves of oil shale resources in the world, my country is rich in oil shale resources, with reserves of 47.644 billion tons converted ...

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Problems solved by technology

[0006] Invention patent CN201110443734.3 discloses oil shale rotary kiln dry distillation and circulating fluidized bed combustion process, shale ash is used as the heat carrier of oil shale dry distillation furnace, so that oil shale rotary kiln dry distillation and circulating fluidized bed boiler are organically combined , but the shale ash as the heat carrier will cause strong adsorption to the retort product of oil shale, thus reducing the yield of shale oil

Invention patent CN201410158250.8 discloses a system and process for comprehensive utilization of oil shale dry distillation and semi-coke gasification, but the gas generated during the dry distillation process of this process has not been effectively recycled, and the pollution of waste gas to the environment cannot be reduced

Invention patent CN105295982 A discloses a comprehensive utilization system and process for the polygeneration of oil shale associated biomass. In order to realize the comprehensive utilization of oil shale, the pyrolysis characteristics of oil shale are realized by using the combustion of gas and semi-coke as the heat source to heat the retort furnace, but the problem is that there is a certain difference in the pyrolysis temperature of biomass and oil shale. During the dry distillation process, secondary cracking is prone to occur to reduce the quality and yield of pyrolysis oil. In addition, the porous characteristics of biomass semi-coke are also easy to adsorb pyrolysis volatile components, thereby reducing the yield of pyrolysis oil.

In addition, the applicant found that the above-mentioned patents all use solid waste and gas circulation to realize heat recovery and reuse, and there is no report on the comprehensive utilization of waste gas and semi-coke

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