System and process for comprehensive utilization of oil shale destructive distillation and semicoke gasification

Abstract

The invention discloses a system for comprehensive utilization of oil shale destructive distillation and semicoke gasification, which comprises a destructive distillation furnace, an oil shale bin, an oil storage tank, an oil-gas separator, a gas heater, a gasification fuel bin, a combustible gas tank, a heater, a gasification furnace and a conveyer device. According to the invention, by using a process for comprehensive utilization of oil shale destructive distillation and semicoke gasification by using the system, semicoke generated by destructive distillation and powdered oil shale are subjected to gasification reaction to generate combustible gas, a part of combustible gas can be used as a fuel to be introduced into the gas heater to heat a heat carrier gas used in the destructive distillation furnace, high-temperature solid residues generated in the gasification furnace are discharged into a heat exchanger to heat cold water into hot water or vapor. According to the invention, the semicoke generated by oil shale destructive distillation is gasified to be recycled, and thus the addition benefits in an oil shale destructive distillation process is increased, heat pollution and chemical pollution of shale residues are reduced, and energy source utilization rate is improved.

Description

technical field [0001] The invention belongs to the technical field of oil shale resource utilization, and relates to a system and a process for comprehensive utilization of oil shale dry distillation and semi-coke gasification. Background technique [0002] Oil shale, also known as "solid petroleum", is an unconventional oil and gas resource with huge reserves. Shale oil with properties similar to natural petroleum can be obtained by heating in a retort device at 400-600°C. The S has been used as a very important petroleum supplementary energy source. At present, the world's proven shale oil reserves are more than 400 billion tons (converted according to oil shale in-situ reserves), which is much higher than the world's proven recoverable crude oil reserves, and this figure will increase with the further exploration of oil shale resources. my country is a country with large reserves of oil shale resources. According to the results of national oil shale resource evaluation f...

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Problems solved by technology

[0004] Invention patent CN200810013088.5 discloses a gas full cycle oil shale graded retort process and device, which uses mixed combustion of gas and semi-coke to provide heat for the oil shale retort furnace, but the hot semi-coke in this process needs to be water-cooled first, resulting in energy The waste and pollution of water resources, and the semi-coke soaked in water has a low calorific value and is difficult to burn

The published patent CN201210189395.5 proposes a gas-solid combined heat transfer oil shale fluidized bed retort system, but the transmission of semi-coke and shale ash in this system is relatively difficult

Invention patent CN201110443734.3 proposes oil shale rotary kiln retort and circulating fluidized bed combustion technology, using shale ash as the heat carrier of oil shale retort furnace, but too much shale ash will have a strong impact on oil shale retort products Adsorption, resulting in reduced shale oil yield

The above-mentioned patents all use the combustion method to utilize solid waste oil shale semi-coke, and there is no public report on the patented technology of semi-coke gasification utilization

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