Material return device anti-blocking device for CFB boiler, and operation method thereof

Abstract

The invention discloses a material return device anti-blocking device for a CFB boiler, and an operation method thereof. The material return device anti-blocking device comprises a material return device, material return device box body vibrating air valves and a material return device wind cap; the at least three vibrating air valves (4) are arranged at the lower part of the box body of the material return device (1) and positioned below the material return device wind cap (6); intercept valves of the vibrating air valves (4) at the lower part of the box body of the material return device are repeatedly closed and opened, and the intercept valves of the vibrating air valves (4) at the lower part of the box body of the material return device are closed till a pressure value of a fluidizing air main pipe is decreased to be a normal value, so that problems that after the automatic fluidization of a material return device of a conventional CFB boiler is destroyed, with the blocking of the material return device, a machine set needs to be restarted after halt cooling, the whole process is long in time consumption, the startup and stop costs of the machine set are high, the great economic loss is caused, the high-pressure fluidizing air system resistance can be increased when the CFB boiler continuously operates after the material return device is blocked, and safety of equipment and the machine set can be affected as two parallelly-operated high-pressure fluidization blowers tack or stall, are solved.

Description

technical field [0001] The invention belongs to boiler combustion operation technology, and in particular relates to an anti-blocking device for a CFB boiler feeder and an operation method thereof. Background technique [0002] When the CFB boiler is in normal operation, as long as the high-pressure fluidizing air volume is adjusted to the design requirement, the feeder will gradually establish the material level and realize self-fluidization. However, when some operating conditions are abnormal, the self-fluidization of the feeder will be destroyed. The pressure of the vertical leg of the feeder will rise rapidly, and finally the material in the feeder will be completely compacted, the external circulation of the boiler will be destroyed, the unit will be forced to shut down, and the feeder will be blocked. After the feeder is blocked, the conventional adjustment method can no longer refluidize the feeder, then the unit will be forced to stop the furnace, cool for two days ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an anti-blocking device for the feeder of a CFB boiler and its operation method, so as to solve the problem of the blockage of the feeder in the prior art after the self-fluidization of the feeder of the CFB boiler is destroyed, which causes the unit to stop for cooling The whole process of restarting the existence is not only time-consuming but also the cost of starting and stopping the unit is high, causing great economic losses and continuing to run the CFB boiler after the feeder is blocked will increase the resistance of the high-pressure fluidizing air system and continue to increase the output of the fluidizing fan Not only can the clogged bed material not be fluidized, but it will also cause two high-pressure fluidizing fans running in parallel to grab air or stall, seriously affecting the safety of equipment and units.

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