Furnace gas management method for oil shale destructive distillation shaft furnace and destructive distillation shaft furnace realizing method

Abstract

The invention provides a furnace gas management method for an oil shale destructive distillation shaft furnace and a destructive distillation shaft furnace realizing the method, belonging to the technical field for distilling shale oil and combustible gas from oil shale. The furnace gas management method for the oil shale destructive distillation shaft furnace comprises the use and the control of the destructive distillation shaft furnace including a preheating section, a destructive distillation section and a waste heat recovering section, a fan, a pipe network and a heat exchanger. The furnace gas management method for the oil shale destructive distillation shaft furnace is characterized in that at the destructive distillation section of the destructive distillation shaft furnace, some gas which penetrates through an inner grate barrel, an outer grate barrel and a material layer of the oil shale is recycled. The destructive distillation shaft furnace comprises the preheating section, the destructive distillation section, the waste heat recovering section, a charging port, a discharging port, a seal device and a furnace gas discharging passageway. The destructive distillation shaft furnace is characterized in that the inner grate barrel and the outer grate barrel, which are repeatedly penetrated by the destructive distillation gas which is taken as a heat carrier and recycled, are arranged at the destructive distillation section of the destructive distillation shaft furnace. The invention is mainly used for distilling the shale oil and the combustible gas from the oil shale.

Description

technical field [0001] The invention relates to a furnace gas management method of an oil shale dry distillation shaft furnace and a dry distillation shaft furnace for realizing the method, belonging to the technical field of extracting shale oil and combustible gas from oil shale. Background technique [0002] The development and utilization of oil shale is an important topic at present. Oil shale carbonization furnace is the key equipment for the development and utilization of oil shale. Due to the obvious advantages of simple structure, convenient maintenance, high reliability and low investment, the retort shaft furnace was once the first choice for shale oil retort furnace. [0003] The main problems existing in the existing oil shale dry distillation shaft furnace are: [0004] 1. The flow direction of the furnace gas in the furnace is unreasonable, and the air flow along the axial direction of the shaft furnace occupies a dominant position. As a result, the flow ar...

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Problems solved by technology

[0004] 1. The flow direction of the furnace gas in the furnace is unreasonable, and the air flow along the axial direction of the shaft furnace occupies a dominant position

As a result, the flow area is small, the heat transfer capacity is poor, the pressure loss is large, and the energy consumption of the fan is high.

[0005] 2. The furnace gas basically has no circulation process

Oxygen in the air reacts (combusts) preferentially with small molecules in the fuel, so on the one hand, it will greatly reduce the production of combustible gas, and on the other hand, it will reduce the light components in shale oil content, thereby reducing the quality of shale oil

At the same time, due to the entry of a large amount of inert gas in the air, such as nitrogen, it will further dilute the produced combustible gas, seriously reducing the unit calorific value of the produced combustible gas, and significantly reducing its quality and value

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