Multi-stage heat exchange device for coal pyrolysis to produce high-calorific-value gas and high-calorific-value block coke

Abstract

The invention relates to a multi-stage heat exchange device for coal pyrolysis to produce high-calorific-value gas and high-calorific-value block coke. The multi-stage heat exchange device is disposedin a system for coal pyrolysis to produce the high-calorific-value gas and the high-calorific-value block coke. According to the multi-stage heat exchange device, high-temperature flue gas generatedduring combustion through a combustion device is introduced, clean gas is introduced to have heat exchange with the high-temperature flue gas, the high-temperature clean gas after heat exchange is sent to a pyrolysis device, the flue gas after heat exchange is sent to a semi-coke screening direct-cooling device, and the remaining flue gas is discharged through a flue gas port. A waste heat boilerand a gas purification device are provided, waste gas generated by the pyrolysis device is sent to the waste heat boiler for heat exchange and production of steam which is sent out, and the waste gasafter heat exchange is sent to the gas purification device to generate clean gas and tar. In the multi-stage heat exchange device, the high temperature flue gas in subjected to reverse heat exchange with the clean gas to generate high-temperature clean gas and low-temperature flue gas.

Description

technical field [0001] The invention belongs to the technical field of coal pyrolysis application, and in particular relates to a process method and a device for producing high calorific value gas and high calorific value lump coke by coal pyrolysis. Background technique [0002] Coal pyrolysis means that coal is heated under anaerobic conditions and undergoes a series of physical and chemical changes to obtain gas, tar and semi-coke. As one of the important technologies for coal processing and utilization, coal pyrolysis technology has a history of more than 100 years. Countries around the world have researched and developed a variety of coal pyrolysis processes. The heat required for coal pyrolysis in these pyrolysis processes generally comes from High-temperature flue gas and high-temperature carrier (high-temperature ceramic ball or high-temperature semi-coke): coal directly contacts with high-temperature flue gas to exchange heat, the mixing speed is fast, the heat tran...

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Problems solved by technology

[0003] At the same time, Chinese patent CN101608126A discloses a coal pyrolysis upgrading device. The heat source of coal pyrolysis is heated high-temperature semi-coke, which is flexible in operation and high in energy utilization efficiency, but the uniform mixing of coal and high-temperature semi-coke is realized through a rotary kiln. , the system complexity is high

Chinese patent CN106753489A discloses a coal pyrolysis steam, tar and coal gas cogeneration system and process based on a pulverized coal furnace. The coil pyrolyzer is placed in the boiler flue, and the high-temperature flue gas directly provides heat outside the pyrolyzer , but the heat transfer area of ​​the coil pyrolyzer is limited, the residence time of pulverized coal is short, and there is also the risk of coal pulverized coal forming and coking inside the pyrolyzer

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