An oil shale dry distillation recovery system and recovery method

Abstract

The invention relates to a dry distillation recovery system and recovery method for oil shale. The recovery system comprises a dry distillation furnace, a cyclone separator, a settlement separation pool, an oil washing tower and a cryogenic tower. The recovery method comprises the following steps: enabling the oil shale to react with a thermal cycle retorting gas and a high-temperature gas in a dry distillation segment; dropping the obtained semicoke into a generation segment to react with air; feeding generated high-temperature gas to the dry distillation segment; feeding the obtained dry distillation product to the cyclone separator to separate; feeding the obtained liquid-phase material to a settlement separation pool; feeding the separated oil into the oil washing tower, and washing the oil together with a gas material in an oil washing segment in a contact manner; feeding the washed gas material to an indirect cooling segment, and recovering a light fraction by condensation; feeding the condensed gas material to the cryogenic tower, and condensing and separating the light oil in the gas material; feeding one part of obtained retorting gas to a heating furnace to burn as fuel; and feeding the residual retorting gas to the dry distillation furnace after heat exchange to serve as the thermal cycle retorting gas. According to the dry distillation recovery system and recovery method for the oil shale, the oil yield is not lower than 90%; and no sewage is generated.

Description

technical field [0001] The invention relates to the technical field of oil shale dry distillation, in particular to an oil shale dry distillation recovery system and recovery method. Background technique [0002] At present, domestic oil shale retort furnaces are mainly Fushun-type retort furnaces, and the retort recovery process adopts a water-washing direct cooling system, that is, after the retort gas including shale oil, water and retort gas is exported from the retort outlet, it is separately In the manifold, washing tower and cooling tower, the circulating water is directly in contact with the retort gas for cooling and washing. The dry distillation gas at 90-100°C coming out of the dry distillation furnace is first sprayed and washed in the manifold, and 60% of the shale oil contained in it is washed off. The temperature of the retort gas washed by the collecting pipe is still about 85°C. After entering from the bottom of the washing tower, it flows in the opposite d...

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Problems solved by technology

[0008] Among the above patents, CN101942313A and CN201193222 patents use water to wash oil and remove dust, resulting in large water consumption, large amount of sewage, and environmental pollution

CN101280201 Use the recovered shale oil as washing oil, wash the oil gas produced by dry distillation and remove dust. Since shale oil is a complete fraction, part of the light oil is taken away by the dry distillation gas during the washing process, which increases the load on the intercooler and electric oil capture system , increasing the energy consumption of the recycling system

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