External-heated and solid heat carrier combined rotary dry-distillation method and device

Abstract

The invention discloses an external-heated and solid heat carrier combined rotary dry-distillation method and device. The method comprises the steps of mixing a heat carrier and dried / preheated raw coal, and enabling a mixture of the heat carrier and the dried / preheated raw coal to be subjected to dry distillation in a dry distillation furnace, so as to generate hot semicoke and coal gas, wherein one part of the hot semicoke is a semicoke product, one part of the hot semicoke is hot coke granules, and the hot coke granules serve as the heat carrier and are applied to coal gas dedusting after the hot coke granules are heated; smoke generated during semicoke heating is used for drying and preheating raw coal. The device comprises a raw coal preheating and drying oven, a semicoke heating furnace and the dry distillation furnace, wherein the raw coal preheating and drying oven and the semicoke heating furnace are located above the dry distillation furnace, and a material outlet of the raw coal preheating and drying oven and a material outlet of the semicoke heating furnace are communicated with a material inlet of the dry distillation furnace; the dry distillation furnace and the semicoke heating furnace are communicated by a hot coke granule circulating and conveying system; the dry distillation furnace preferably is an external-heated dry distillation furnace. The method and the device, disclosed by the invention, have the advantages that the thermal efficiency is high, the calorific value of the coal gas is high, the dust content is low, and the yield is large; the device is compact in structure and small in floor area.

Description

technical field [0001] The invention relates to coal dry distillation technology, in particular to a rotary dry distillation method and device combining an external heating type and a solid heat carrier. Background technique [0002] The existing vertical coal carbonization process is an internal heat type, the calorific value of gas is low, the nitrogen content is high, and surface coal cannot be carbonized. In addition, in the vertical fluidized bed solid heat carrier circulation dry distillation process, the circulating semi-coke has a large lifting height, high energy consumption, large dust in the gas, and unsmooth material movement during the dry distillation process, which may easily cause equipment blockage and produce heavy tar. There are many components in the oil, the mixture of tar and dust is easy to adhere to the equipment, and it is not easy to separate. However, the traditional external heat rotary retort has problems such as low thermal efficiency of retort...

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Problems solved by technology

[0003] In view of the defects or deficiencies of the prior art, one of the purposes of the present invention is to provide a rotary carbonization method combining external heating and solid heat carrier to solve the problem of low calorific value of gas in the existing vertical coal carbonization process. The problem of not being able to dry distill surface coal, while reducing the amount of solid heat carrier circulation, reducing the generation of dust in the gas, filtering the dust in the gas through high-temperature hot semi-coke, reducing the dust and heavy components in the tar, reducing the lifting height of the circulating semi-coke, saving Energy, while improving the thermal efficiency of the externally heated rotary furnace, reducing the size of the enlarged equipment due to the low thermal efficiency of the externally heated rotary retort, which is convenient for large-scale production

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