High pressure air clearing method for treating fault of feedback appts. of circulation fluidized bed boiler

Abstract

The present invention relates to boiler controlling technology, and is especially the high pressure blast sweeping method for fast treating product returning device jamming accident in circular fluidized bed boiler. According to the design scheme the present invention provides, high pressure blast pipe is connected in the product returning device, and in case of abnormal temperature and pressure inside the product returning device, the control valve in high pressure blast pipe is opened and high pressure blast is utilized in blowing off the slag block deposited into the grid plate in the product returning device to restore the normal work state of the product returning devie. The high pressure blast pipe is connected to the grid plate and the high pressure blast sweeps upwards from the wind cowl on the grid plate. The present invention utilizes available high pressure medium in boilr for fast treating product returning device jamming via simple sweeping.

Description

technical field [0001] The invention relates to a boiler control technology, in particular to a high-pressure air purging method for quickly dealing with the clogging accident of a return feeder of a circulating fluidized bed boiler. Background technique [0002] The circulating fluidized bed boiler feeder is the key equipment to ensure the circulation of solid particles. Its function is to ensure that the circulating material is sent from the negative pressure area to the positive pressure area, and to ensure that the flue gas is not short-circuited and reversed. In a circulating fluidized bed boiler using a high-temperature separator, the temperature of the circulating material is as high as 800°C or more, so the control of the flow of the circulating material adopts a non-mechanical method, relying on the high-temperature circulating ash collected from the high-temperature separator, in the vertical pipe of the return feeder Form the material level, use it to overcome the...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, due to the change of operating conditions and the change of coal type, the temperature of the circulating material will fluctuate. Once the temperature exceeds the melting point of the ash, or the refractory material that has peeled off and burst from the upper part of the feeder falls into the feeder, causing local material If the fluidization is not good, it will lead to partial coking of the circulating material in the feeder, which will hinder the circulation and cause the shutdown of the furnace.

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