A drying-pyrolysis integrated vertical furnace

Abstract

A drying-pyrolysis integrated vertical furnace, which uses a baffled (similar to a continuous S-shaped) conveyor belt operating in a three-dimensional space of 3 to 30 sections as a material conveying device. The vertical furnace uses high-temperature gas (or High-temperature flue gas) as a gas heat carrier and the material coal or biomass are exchanged in multiple staggered countercurrents to achieve heat exchange. The bottom-to-top temperature gradient of the gas heat carrier is used to gradually realize the drying and low-temperature heat of the material coal or biomass from top to bottom. decomposition and medium- to high-temperature pyrolysis. This vertical furnace has a wide range of material particle sizes. It can realize the integration of drying and pyrolysis of coal or biomass in the same furnace, and can effectively use the flue gas generated by pyrolysis of coal or biomass to cool the outlet of the vertical furnace. The hot semi-coke can be used to regulate the temperature of the gas heat carrier, thereby improving the thermal energy utilization of the vertical furnace. It has simple design, flexible and simple operation, low investment cost and is easy for industrial application.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and in particular relates to a vertical furnace integrating drying and pyrolysis. Background technique [0002] my country's energy situation of "rich in coal, poor in oil, and low in gas" determines that my country will continue to use coal as the main body of energy consumption for a long time in the future. Coal pyrolysis can produce gas (coal gas), liquid (tar) and solid (semi-coke or coke) products in three phases, which can realize clean and efficient comprehensive utilization of coal resources, and is an effective way to develop high value-added coal chemical industry . [0003] Many countries are developing their own unique coal pyrolysis technology, such as the Garrett process and Toscoal process in the United States, the LR process in Germany, the coal rapid pyrolysis process in Japan, the fluidized bed coal rapid pyrolysis process in Australia, the former Soviet Union The ETCH-1...

AI Technical Summary

Problems solved by technology

However, the LR process has certain limitations in terms of coal particle size (applicable particle size range is 20-80mm), and both powdery lignite and bituminous coal need to be pre-briquetted, and the design of the pyrolysis furnace device is complicated and the investment is large.

In addition, there are few reports on devices or equipment that use the heat carried by the pyrolysis gas generated by coal or biomass pyrolysis to dry raw coal or biomass

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