Oil shale gas-solid heat carrier dry distillation and semicoke combustion electricity generation integral process

Abstract

The invention relates to an oil shale gas-solid heat carrier dry distillation and semicoke combustion electricity generation integral process, which is characterized in that oil shale crushed into at least 75mm is stored in a raw material cabin and is sieved, small-particle oil shale with the particle diameter smaller than 15mm and 15-75 mm large-particle oil shale are respectively conveyed into a left chamber and a right chamber of a medium-temperature gas indirect or direct heat exchange drying heater, and 15-75 mm large-particle oil shale subjected to heating and drying is subjected to gas heat carrier dry distillation; the small-particle oil shale with the particle diameter smaller than 15mm and semicoke are mixed and are subjected to solid heat carrier dry distillation; oil-gas mixtures generated by the solid heat carrier dry distillation are subjected to purification, condensation and separation treatment after sedimentation and gas-solid separation, shale oil is conveyed into an oil storage tank, one part of separated gas is used as heat carriers of the dry distillation of the 15-75 mm large-particle oil shale, and the rest gas is conveyed into a gas storage tank; superheated steam produced by semicoke consumption is conveyed into a steam turbine generator set for electricity generation; one part of semicoke consumption high-temperature hot ash is used as the heat energy of the dry distillation of the small-particle oil shale with the particle diameter smaller than 15mm; and the other part of discharged hot ash is cooled and is then conveyed to a building material factory.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of oil shale resources, in particular to an integrated process of dry distillation of oil-collecting shale gas solid heat carrier for oil refining, semi-coke combustion, power generation and comprehensive utilization of ash. The integrated process can also be used for coal, oil sands, waste tires, petroleum coke, organic waste and biomass. Background technique [0002] Energy is the cornerstone of the existence of human society and an indispensable factor to ensure the normal operation of the national economy. The rational development and utilization of primary energy will play an important role in promoting economic and social development. According to statistics in 2011, the reserve-production ratios of coal, oil and natural gas in the world are 112 years, 54.2 years and 63.6 years respectively, while those in China are 33 years, 9.9 years and 29.8 years respectively. Accordin...

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Problems solved by technology

The gas heat carrier method has the following disadvantages due to its carbonization characteristics: 1. Because it can only process massive shale with a large particle size, the required carbonization time is long, and some shale has not been completely carbonized, so the gas The heat carrier carbonization method has the disadvantages of low carbonization efficiency and low oil yield; 2. The small particle shale produced in the crushing process is often discarded and not fully utilized, resulting in serious waste of resources; 3. The semi Coke contains a certain amount of fixed carbon, which has not been fully utilized, making the overall carbonization thermal efficiency low; 4. It is necessary to burn gas to heat the gas heat carrier required by the carbonization furnace or establish a separate gas generator to generate gas as the gas heat carrier

However, this kind of dry distillation method needs to crush oil shale to a small particle size, which consumes a lot of energy. At the same time, the combustion furnace only provides high-temperature hot ash and does not participate in the production of electric energy, making the product of the system too single

[0007] China Invention Patent Application Publication (Announcement) CN101117584 discloses the applicant, and the title of the invention is: "oil shale dry distillation refinery, semi-coke combustion power generation integrated process", which can realize the oil shale dry distillation refinery at the same time, burn dry semi Coke power generation, because the research stage of the process is different from that of the present, it did not consider using the flue gas generated by the circulating fluidized bed boiler to dry the wet oil shale, and at the same time, it did not consider the hot ash at the bottom of the circulating fluidized bed boiler as a solid The heat carrier is sent into the retort and mixed with shale for retort, so this process has limitations, and the comprehensive utilization of oil shale has not yet been maximized

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