A polygeneration system and method guided by coal pyrolysis

Abstract

The invention relates to a poly-generation system and method with coal pyrolysis as guide. The system comprises a coal pyrolysis unit and a semicoke combustion power generation unit which can run independently. The coal pyrolysis unit comprises a dryer, a preheater, a pyrolysis kiln, a high-temperature gas filter, a pyrolysis gas cooling and waste heat recycling device, a second cooler and a tar electric fishing device which are connected in sequence, and also comprises a fluidized bed furnace connected with the pyrolysis kiln. The semicoke combustion power generation unit comprises a circulating fluidized bed boiler connected with the pyrolysis kiln, a waste heat recycling boiler, a bottom ash cooler, a gas turbine and a power generator, wherein the waste heat recycling boiler and the bottom ash cooler are connected with the circulating fluidized bed boiler, the gas turbine is connected with the circulating fluidized bed boiler and the waste heat recycling boiler, and the power generator is connected with the gas turbine. The pyrolysis gas cooling and waste heat recycling device, the waste heat recycling boiler and the bottom ash cooler are all connected with the dryer and used for providing hot flue gas for the dryer. The poly-generation method is also provided for achieving prior extraction of coal gas and tar, and then semicoke is used for combustion power generation. In addition, a pyrolysis system and a power generation system can run independently.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and specifically relates to an oil, gas, heat and electricity polygeneration system and method guided by coal pyrolysis. Background technique [0002] Traditional power generation is completed by grinding coal into pulverized coal and sending it to a boiler for combustion, which then generates steam to drive a steam turbine, which then drives a generator. For many types of coal, such as long-flame coal, non-caking coal and lignite, etc., because these coals usually contain high volatile matter and tar, if they are directly burned, these valuable resources will be burned in vain. The most reasonable and efficient way to utilize coal resources is to first extract these substances through pyrolysis technology, and then use the pyrolyzed semi-coke to burn for power generation. [0003] Over the years, people have carried out the development and testing of various forms of coal compreh...

AI Technical Summary

Problems solved by technology

Even the circulating fluidized bed combustion power generation technology with coal pyrolysis as the core also adopts the pyrolysis process with circulating fluidized bed ash as the heat carrier, and the pyrolysis device is mostly in the form of a fluidized bed, which directly leads to The pyrolysis gas quality is not high

[0004] The above-mentioned polygeneration technologies for comprehensive utilization of coal have been unable to enter the stage of industrial application due to problems such as power generation and gasification or pyrolysis that cannot operate independently and interfere with each other, and equipment specifications are difficult to scale up.

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