Small-size oil shale dry distillation system heated based on heat accumulation type gas radiation pipe

Abstract

The invention relates to a small-size oil shale dry distillation system heated based on a heat accumulation type gas radiation pipe. The system serves as a stepping type furnace; oil shale is heated to be at 180-220 DEG C through radiation heat provided by the heat accumulation type gas radiation pipe to be dried and then is heated to be at 480-520 DEG C to be subjected to dry distillation at low temperature, so that the oil shale is pyrolyzed to generate products, such as the shale oil, dry distillation gas and semi-coke; and a waste heat recycling section is used for enabling cold gas generated by the dry distillation of the oil shale to perform absorption and dry distillation on waste heat of semi-coke to generate hot gas as fuel of the heat radiation pipe. The small-size oil shale dry distillation system disclosed by the invention has the advantages of being simple in process, high in heat efficiency, low in energy consumption and the like.

Description

technical field [0001] The invention belongs to the technical field of oil shale dry distillation, and in particular relates to a small particle oil shale dry distillation system based on heat storage type gas radiant tube heating. Background technique [0002] At present, the furnaces used for oil shale carbonization are divided into solid heat carrier carbonization furnaces and gas heat carrier carbonization furnaces. However, most domestic retort equipment can only retort materials with a particle size of 10 mm or more. Small particles below 10 mm have small particles, small space between materials, and poor air permeability. Furnace blockage and coking make the retort furnace unable to operate normally, so small particles of oil shale are discarded, and the resource waste rate reaches more than 20%. For example, the Fushun type retort furnace can only retort oil shale above 12mm. [0003] There are three typical devices for carbonization of small particle oil shale in ...

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Problems solved by technology

[0003] There are three typical devices for carbonization of small particle oil shale in foreign countries. One is the ATP furnace (Alberea-Taciuk Processor) in Australia. This device is a solid heat carrier rotary retort furnace with huge equipment, complex structure and large power consumption. , The operation is unstable, the furnace is often shut down for maintenance, the operating rate is only about 50%, and the longest continuous operation is only 96 days

One is the Galoter furnace in Estonia, which can process 0-25mm oil shale, with a processing capacity of 3000t / d. The problem with the equipment is that the operation rate is not high, the proportion of heavy oil is large, there are mechanical operations, oil and gas Dust removal and flue gas dust removal and other issues

The third is the Tosco-II oil shale dry distillation technology developed by Tosco Corporation of the United States, which is used to process small particle oil shale. This system uses ceramic balls as the heat carrier, and the oil recovery rate reaches 90%. The problems with this equipment are: : High investment in equipment, large amount of maintenance, low thermal efficiency, and the latent heat (fixed carbon) in oil shale semi-coke is not utilized

The device uses thermal cycle gas to exchange heat with oil shale, part of the heat is lost in the external pipeline circulation, the heat utilization rate is low, and the equipment structure is complex

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