Kerosene shale comprehensive utilization process

Abstract

The invention relates to a comprehensive utilization process of oil shale. Oil shale raw ore is crushed by a crushing and screening device until the particle size is less than 15mm; one part of crushed oil shale particles are transported to a screw feeder and then to a microwave drum dry distillation device, the oil shale particles absorb microwave and generate high temperature methane gas, distilled char and methane gas are entered into a closed solid and gas separating device, separated high temperature methane gas is entered into a condensing and recycling device and cooled to separate the oil shale; low temperature methane gas after oil extraction is entered into an internal combustion engine to be combusted for power generation and / or entered into a circulating fluidized bed boiler to be combusted, heat quantity released from the combustion is transmitted to water by the heating surface of a boiler, the superheated steam is supplied as working fluid or sent into a steam turbine to generate electricity; carbon-content of the slag and ashes is less than 2 percent and the finished product can be directly as building raw materials without roasting. The invention has the advantages of short process, comparatively small occupying space, high comprehensive utilization, low cost, being scientific and rational, etc.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of oil shale resources, and relates to a comprehensive utilization process of oil shale. The process can also be applied to lignite and biomass. Background technique [0002] Oil shale is a sedimentary rock containing organic matter (usually 5% to 50%). The kerogen contained in oil shale is a polymer insoluble in organic solvents, which can be degraded into hydrocarbon shale oil after dry distillation, commonly known as artificial petroleum. The world's oil shale resources are very rich, and its deposits are all over the place, but its distribution is not balanced. By the end of 2005, the total proven oil shale reserves of 37 countries were converted into about 410Gt of shale oil, which is equivalent to the world's oil exploration. 2.5 times the proven recoverable reserves. [0003] The existing comprehensive utilization of oil shale is to consider the exploitation of oil shal...

AI Technical Summary

Problems solved by technology

Its disadvantages are: 1. The heating speed of the gas heat carrier retort furnace is slow, and the retort time is long, usually 12-24 hours, so the processing capacity is greatly limited; 2. Gas is needed as the heat carrier during the retort process. A separate intermittent heating furnace burns part of the gas to heat the circulating gas to supplement the heat source, which not only wastes a part of the gas, but also the working process of this preheating furnace is not easy to control, and the oil yield is low; 3. Lumpy oil If the semi-coke produced by dry distillation of shale is to be used economically, it needs to be cooled by a dry cooler or a wet cooler, and then crushed by a crusher before it can be used.

If a wet cooler is used, although it has a good sealing effect on the retort furnace, since the discharged semi-coke contains 30-50% of water, it must be dried before it can be used, otherwise it is not conducive to the combustion of the circulating fluidized bed

Adding drying devices will undoubtedly increase equipment investment and complicate the system

If a dry cooler is used, although there is almost no water in the semi-coke, no additional drying equipment is required, but the existing dry cooler cannot ensure that the slag outlet of the retort furnace is well sealed

At the same time, this kind of dry cooler is only an ideal conceptual design, and has not been reported. The gas heat carrier dry distillation furnaces that are usually in operation all use wet cooling methods, that is, wet decoking processes.

In addition, there must be a loss of usable energy after the high-temperature semi-coke passes through the cooler, which undoubtedly wastes high-level heat sources

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