Oil shale distillation process employing dry coke exhaust gas heat carrier

Abstract

The invention discloses an oil shale distillation process employing a dry coke exhaust gas heat carrier. The process is characterized in that an oil shale dry distillation gas is adopted as a gas heat carrier for supplying heat; the heat required for dry distillation is provided by combustion of dry semicoke and a gas, and is suitable for dry distillation of 10-100mm of massive oil shale; the kerogen pyrolysis ratio in the oil shale is 98%-98%; and the oil yield of dry distillation is 90%-96%. The core of the process is a dry distillation furnace; the dry distillation furnace comprises a sealed anti-blocking charging device, a dry distillation furnace body with a constant-temperature dry distillation section, and a sealed anti-blocking dry coke exhaust device with air seal. In the dry distillation process, air is prevented from sneaking into the dry distillation furnace to generate an oil burning phenomenon; sufficient heat supply for dry distillation and complete pyrolysis of the oil shale are ensured; and an oil gas is prevented from leaking from a furnace hearth during dry coke exhaust, resulting in environment pollution and loss, thus complete dry distillation of the oil shale is ensured; the problems of oil burning, oil gas loss and the like are overcome; and meanwhile, the problem that semicoke is difficult to utilize caused by wet coke exhaust is solved.

Description

technical field [0001] The invention belongs to an oil shale dry distillation process, which is a dry coke exhaust gas heat carrier oil shale dry distillation process. Background technique [0002] When oil shale is subjected to thermal distillation, kerogen in oil shale pyrolyzes to produce shale oil and gas. At present, there are two widely used oil shale retort heating methods, one is the gas heat carrier heating method, and the other is the solid heat carrier heating technology. [0003] At present, there are three main oil shale gas heat carrier dry distillation refining processes widely used at home and abroad. One is the Fushun-type circular furnace carbonization process with a generating section, wet coke removal, using the flue gas in the generating section containing a small amount of gas and circulating gas for heating, processing 12-75mm oil shale, the oil recovery rate is 60-65%, half The oil content of coke is 0.4-0.5%, the pyrolysis of oil shale is inco...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a dry distillation process of coke gas heat carrier oil shale to solve the problem of incomplete oil shale pyrolysis in the existing oil shale gas heat carrier dry distillation process. Low-grade oil shale gas full-cycle dry distillation has insufficient heat supply, needs supplementary heat supply and wet coke discharge semi-coke is difficult to use. Semi-coke and gas are used for combustion in circulating fluidized bed boilers to provide heat and power generation for dry distillation. All the heat required for dry distillation is provided by burning dry distillation gas and dry semi-coke, and no external heat supply is required.

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