Dual-heat-source low-rank-coal low-temperature-carbonization pyrolysis technology system

Abstract

The invention discloses a dual-heat-source low-rank-coal low-temperature-carbonization pyrolysis technology system. The dual-heat-source low-rank-coal low-temperature-carbonization pyrolysis technology system comprises a fluidized-bed raw-coal drying dehydration device, a low-rank-coal low-temperature-carbonization pyrolysis device, a fluidized-bed semi-coke cooling device, a nitrogen circulatingsystem and a dual-heat-source system; the dual-heat-source system comprises a pyrolysis-coal-gas heat supplying pipe system adopting one part of pyrolysis coal gas generated by the low-rank-coal low-temperature-carbonization pyrolysis device as a first heat source and one part of pyrolysis coal gas generated by the low-rank-coal low-temperature-carbonization pyrolysis device as a second heat source, the pyrolysis coal gas of the first heat source is burned into high-temperature flue gas through a fuel-gas hot air furnace in an external heating mode to become an external heat source of the low-rank-coal low-temperature-carbonization pyrolysis device, and purified pyrolysis coal gas of the second heat source is heated into hot coal gas through a coal gas reheater to directly enter a coal layer of the low-rank-coal low-temperature-carbonization pyrolysis device to participate a carbonization pyrolysis reaction. According to the dual-heat-source low-rank-coal low-temperature-carbonizationpyrolysis technology system, through recycling of waste heat of the technology system, energy consumption is reduced, the purity, a heat value and the coal-carbonization-pyrolysis finished-product recovery rate of output coal gas are increased, and the coking technology wastewater quantity is decreased.

Description

technical field [0001] The invention relates to the technical field of low-temperature carbonization and pyrolysis of coal, in particular to a process system for low-temperature carbonization and pyrolysis of low-rank coal with dual heat sources. Background technique [0002] After more than 200 years of development, more than 80 production techniques have been developed for medium- and low-temperature carbonization and pyrolysis of coal, and there are a certain number of relatively mature technologies. [0003] Low-rank coals such as lignite and long-rock coal are suitable for low-temperature dry distillation processing. Low-rank coal can be converted into gas, liquid and solid products through low-temperature dry distillation processing, which has good economic and social benefits. [0004] Low-temperature dry distillation technology is a technology that has been generally recognized and valued at present. It refers to the process of heating coal to 500-700°C in the absenc...

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Problems solved by technology

[0015] The disadvantages of the Garrett process mainly include: the generated tar and dust semi-coke will adhere to the inner wall of the cyclone and the pipeline, and the long-term operation will block the pipeline; the contact between the circulating semi-coke and the input coal, and sufficient heat exchange It will intensify the fine pulverization of coal, increase the amount of semi-coke in circulation, and make the coal processing capacity of the system unable to increase too much

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