Oil shale circulating fluidized bed retorting method based on methane-rich mixed gas and oil shale circulating fluidized bed retorting system based on methane-rich mixed gas

Abstract

The invention belongs to the field of energy, and particularly relates to an oil shale circulating fluidized bed retorting method based on methane-rich mixed gas and an oil shale circulating fluidizedbed retorting system based on methane-rich mixed gas. According to the method, the activated mixed gas of methane-rich mixed gas and carbon dioxide is adopted as fluidizing gas, and by the way of heat exchange, the semi-coke of the fluidized retorting of oil shale sequentially heats a catalyst layer and a heat exchange gas chamber to promote the catalytic activation of the methane-rich mixed gasand carbon dioxide; after fluidized retorting product, except the semi-coke, undergoes gas-solid separation, condensing liquefaction and oil-water separation, shale oil, noncondensable gas and water are respectively obtained, solid particles which are separated out by gas-solid separation return into a retorting chamber for further reaction, and thereby the oil shale retorting conversion rate is increased. The activated mixed gas of the methane-rich mixed gas and carbon dioxide can be in sufficient contact with the oil shale, which is favorable for the combination between activated molecules and oil shale retorting free radicals, consequently, the yield of oil is increased, the hydropyrolysis cost is reduced, greenhouse gas emission is reduced, and the environment is improved; and catalystis easy to recycle and reuse. Operation is simple and convenient, and mass production is easy.

Description

technical field [0001] The invention belongs to the field of energy, and in particular relates to an oil shale circulating fluidized bed dry distillation method and system based on methane-enriched mixed gas. Background technique [0002] Oil shale is an unconventional oil and gas resource with abundant reserves and wide distribution. As an important energy mineral resource, oil shale can not only extract shale oil and related petrochemical products, but also be used as fuel for power generation, heating and transportation. Oil shale dry distillation methods mainly include underground dry distillation and aboveground dry distillation. The former is also called in-situ dry distillation or in-situ dry distillation. It means that underground oil shale is directly heated without exploitation to generate shale oil and is exported to the ground, because oil and gas are easy to go underground. Leakage from rock formations has caused pollution and low oil yields, and production has...

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Problems solved by technology

Therefore, whether oil shale is suitable for extraction of shale oil in a methane-enriched atmosphere, what are the pyrolysis conditions in a methane-enriched atmosphere, what is the shale oil yield in a methane-enriched atmosphere, and what kind of pyrolysis and carbonization device is used in a methane-enriched atmosphere , which is not only conducive to the full pyrolysis and carbonization of oil shale, but also makes full use of the pyrolysis energy, which still needs to be studied

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