Oil shale retorting process reclaiming method

Abstract

The invention discloses an oil forming shale retorting technique recovery method. Cyclone oil trapping, indirect cooling, heavy oil washing, electricity trapping tar, and other washing techniques and related equipment are introduced into the oil recovery process of the product of retorting. Firstly, shale oil and dust are separated from the product of retorting by direct washing via a gas collecting groove; after oil drips and dust are removed by a cyclone trapping tower, the product of retorting enters into an indirect cooling tower; after further cooling, a majority of shale oil and dust are condensed off. The gas coming out from the indirect cooling tower enters into an oil washing tower, the light oil in the retorting gas can be collected by the shale oil which is self-produced by the technique. Oil steam existing in gas form is collected in the electricity trapping tar tower. Finally, the retorting gas is sent into the system by a gas fan for recycling, the washing water circulates in closed loop in the system. The invention can improve the oil recovery rate by 10-15 percentage points; reduces the emission of pollutants; improves the automation degree of the overall operation; and reduces the contents of impurities in the oil.

Description

1. Technical field [0001] The invention is a processing technology for producing shale oil by utilizing kerogen shale resources, and is an upgrade and transformation for the existing dry distillation process recovery system. 2. Background technology [0002] The recovery system of the existing dry distillation process adopts a three-stage water washing system, that is, the dry distillation products including shale oil, water and dry distillation gas are directly separated by circulating water and dry distillation products in the manifold, washing tower, and cooling tower. Contact for cooling and washing, the shale oil is taken away by water, and then through the oil-water separation system to obtain the finished shale oil. The washing water after removing shale oil is recycled in the system. [0003] The washed dry distillation gas is divided into three parts: one part is sent to the regenerative heating furnace for heating as the heat carrier for shale carbonization; one p...

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Problems solved by technology

[0006] B. The process of recovering oil is completed by direct washing with water. Each dry distillation device can produce 23-25 ​​tons of dry distillation sewage per hour. The treatment process for dry distillation sewage is complicated and the cost is high

[0007] C. The three-stage washing system uses circulating water, which has a large circulation system and consumes a lot of power

[0008] D. There are many pumps, tanks, and tanks in the system, and the adjustment of the liquid level must be done manually, with a low degree of automation

[0009] E. There are many emission points in the towers, tanks and tanks in the system, the site has a strong pungent smell, and the working environment is poor

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