Hot preparation method for high-solid-content oil slurry heating furnace of direct coal liquefaction device

By using the independent operation design of the double furnace chamber and the valve operation switch of the backup furnace in the coal direct liquefaction fractionation system heating furnace, the system fluctuation problem caused by coking during operation of the heating furnace is solved, and the constant temperature and constant pressure hot backup state of the backup furnace is realized, ensuring the safe and efficient operation of the heating furnace.

CN119826365APending Publication Date: 2025-04-15CHINA SHENHUA COAL TO LIQUID & CHEM CO LTD +1
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Patent Information

Application Number
CN202510066826.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-16
Publication Date
2025-04-15

AI Technical Summary

Technical Problem

The coal direct liquefaction fractionation system heating furnace is prone to fluctuations in system during operation due to coking, and it is difficult to maintain constant temperature and pressure in the backup furnace in a hot standby state, which affects safe operation.

Method used

The design of dual furnaces is independently operated, and the connection of the spare furnace pipe is switched through valve operation, the spare furnace is ignited and the gas flow and flush oil flow are adjusted to control the temperature and pressure of the spare furnace pipe to reach the preset value.

Benefits of technology

The constant temperature and constant pressure hot standby state of the backup furnace is realized, ensuring that the heating furnace can be switched quickly in the event of a failure, reducing the risk of system fluctuations, and improving safe operation and efficiency.

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Abstract

The invention discloses a hot standby method for a high-solid-content oil slurry heating furnace of a direct coal liquefaction device. The hot standby method comprises the following steps: cutting off communication between an inlet end of a standby furnace tube and a heating furnace inlet header pipe and communication between an outlet end of the standby furnace tube and a heating furnace outlet header pipe; the inlet end of the standby furnace tube is communicated with the flushing oil supply pipe, and the outlet end of the standby furnace tube is communicated with the flushing oil return pipe, so that the flushing oil fills the standby furnace tube and then returns to the flushing oil return pipe; igniting a burner nozzle of a radiation chamber of the standby hearth, and controlling the temperature of the standby hearth to a preset temperature by adjusting the flow of gas serving as fuel; and after the temperature of the standby hearth reaches the preset temperature, the oil feeding flow of flushing oil conveyed to the standby furnace tube and / or the oil returning flow of flushing oil entering the flushing oil returning tube are / is adjusted, so that the pressure of the standby furnace tube is controlled to reach the preset pressure. The heating furnace can be switched at the first time when having a fault, and stable operation is ensured.
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