A system and method for coal pyrolysis combined production of activated carbon

Abstract

The invention discloses a system and a method for the joint production of activated carbon by virtue of coal pyrolysis. The main part of the system comprises a vapor generator and three process units, namely a coal pyrolysis unit, a coal gasification unit and a pyrolysis semicoke carbonization unit. High-temperature gasified gas produced by the coal gasification unit sequentially serves as heat source carriers of the pyrolysis semicoke carbonization unit, the vapor generator and the coal pyrolysis unit, thereby realizing the gradient utilization of the sensible heat of the high-temperature gasified gas; hot semicoke generated by the coal pyrolysis unit is converted into activated carbon on the spot by the pyrolysis semicoke carbonization unit, thereby realizing the utilization of the sensible heat of the hot semicoke; water vapor provided by the vapor generator to the coal gasification unit servers as a gasifying agent or an oxidizing agent. According to the system, the technical route of poly-generation of coal gas, tar and activated carbon is realized; the system is simple in design, high in energy utilization rate, strong in practicability and is convenient for industrial application.

Description

Technical field [0001] The invention belongs to the field of coal chemical industry, and specifically relates to a system and method for coal pyrolysis combined production of activated carbon. Background technique [0002] my country's energy situation of "rich coal, poor oil, and low gas" determines that my country will continue to use coal as the main energy consumption for a long time in the future. Coal pyrolysis technology can realize clean and efficient conversion of coal resources, and can produce three products of coal gas, tar and semi-coke at the same time. It is one of the effective ways to develop high value-added coal chemical industry. [0003] However, coal pyrolysis semi-coke still has problems in its utilization, which are mainly reflected in the following aspects: ① Semi-coke has high ash content and high hardness. Whether it is made into coal water slurry or dry powder gasification, it is easy to block gasification. The cost of effective synthesis gas gasificati...

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Problems solved by technology

[0003] However, there are still problems in the utilization of coal pyrolysis semi-coke, which are mainly reflected in the following aspects: ①Semi-coke has high ash content and high hardness. Whether it is made into coal-water slurry or dry powder gasification, it is easy to block the gasification furnace, and the gasification cost of effective syngas is high, which limits the development path of coal pyrolysis semi-coke as gasification raw material; Combustion is not easy to ignite; ③The market demand for semi-coke is limited: the demand for semi-coke in blast furnace injection, ferroalloy, calcium carbide industry and synthetic ammonia is limited. The existing pulverized coal boilers or circulating fluidized bed boilers are mostly designed according to bituminous coal. If semi-coke is used, existing equipment and control procedures need to be modified and adjusted, which will undoubtedly increase costs. In addition, the current market price of semi-coke is higher than that of bituminous coal, so the semi-coke used by power plants is also very limited.

To sum up, the nature of coal pyrolysis semi-coke itself makes it unfavorable to gasification and combustion and other utilization paths, which seriously restricts the rapid development of coal pyrolysis technology

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