Coal gas, tar, semi-coke and steam poly-generation method based on fluidized bed pyrolysis technology

Abstract

The invention relates to a coal gas, tar, semi-coke and steam poly-generation method based on a fluidized bed pyrolysis technology. The method comprises the following steps of: mixing coal and high-temperature semi-coke serving as a heat carrier in a fluidized bed pyrolysis furnace, heating, precipitating volatiles, and cooling and separating the volatiles to obtain tar and pyrolysis coal gas; discharging one part of semi-coke to obtain a semi-coke product, feeding the other part of semi-coke into a fluidized bed semi-coke heating furnace, performing combustion reaction with a small amount of fed air, heating all the fed semi-coke by using heat released after a small amount of semi-coke is combusted, feeding the heated semi-coke into a cyclone separator along with flue gas, and feeding the separated high-temperature semi-coke serving as the heat carrier into the fluidized bed pyrolysis furnace; and feeding the flue gas subjected to gas-solid separation into a complementary combustion waste heat boiler, completely combusting a small number of combustible components in the flue gas, producing steam, feeding into an air preheater to heat air required by combustion, removing dust by using a dust remover, and emptying. The method has the advantages of realizing the fractional conversion of the coal and improving the utilization efficiency and benefit of the coal.

Description

technical field [0001] The invention relates to the field of coal conversion, in particular to a gas tar semi-coke steam polygeneration method and device based on fluidized bed pyrolysis technology. Background technique [0002] The salient features of my country's energy resources are rich in coal, low in oil and short of gas. According to the particularity of our country's resource conditions, develop coal gas, tar, semi-coke and steam polygeneration technology based on coal pyrolysis, use relatively abundant coal resources to produce tar and gas to replace relatively scarce oil and gas resources, and produce various Chemicals, together with semi-coke and steam, meet the needs of social and economic development, which is a good way to use resources rationally. In addition, coal is a mixture of moisture, volatile matter, ash, and fixed carbon, and is a complex mixture of hydrocarbons and polymers. But at present, coal resources are often used as a single purpose, most of ...

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Problems solved by technology

The use of high-temperature flue gas as the gas heat carrier will cause the volatile products released by coal thermal analysis to be diluted by the flue gas, so that the calorific value of the gas is not high, the concentration of effective components is low, and the use value is low; After the pyrolysis gas is cooled, part of the gas is heated again by external heating to high-temperature gas as a heat carrier, which consumes a lot of energy, has low thermal efficiency, and consumes a large part of the high-grade product gas

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