How to transform the slag pipe of circulating fluidized bed boiler

To be specific, what are the defects of the slag discharge pipe, why should it be changed, is it to change the slag pipe of the cold slag machine or to change the slag discharge pipe of the accident slag discharge?

Summary. Circulating fluidized bed boiler furnace coking accident is a common combustion fault, can be divided into low temperature coking and high temperature coking, low temperature coking is the phenomenon of low bed temperature due to poor fluidization of particles sticking together, high temperature coking occurs when the bed temperature rises sharply more than the ash melting point of coal, oxygen content drops sharply, the flame fluidization is poor and the large area is white, the amount of slag is small or can not be released, the negative pressure continues to increase when the bed temperature is low, the wind pressure in the wind chamber is high and the fluctuation increases, and the primary air volume decreases. Mainly due to the fact that the coaling speed is too fast and too much in the process of ignition and pressurization, or there is no air when coaling, a large number of particles that are not fully burned are gathered together for deflagration, and the oxygen amount does not start to rise when the fire is pressurized, and the fan operation is stopped.

The return material of the returner is abnormal, the coal feeder is cut off, the load increases too quickly, the hood is damaged, the ash falls into the air chamber and the air distribution is uneven, and the bed material is too thick and the slag is not discharged in time.

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Circulating fluidized bed boiler furnace coking accident is a common combustion state failure, can be divided into low temperature coking and high temperature coking, low temperature coking is the phenomenon of particles adhesion together due to poor fluidization when the bed temperature is low, when high temperature coking occurs, the bed temperature is disturbed and the seepage rises sharply to exceed the ash melting point of coal, the oxygen content drops sharply, the flame fluidization is poor and the large area is white, the slag amount is small or can not be released, the negative pressure continues to increase when it is serious, the wind pressure in the air chamber is high and the fluctuation increases, and the primary air volume decreases. It is mainly due to the fact that the coaling speed is too fast and too much in the process of ignition and pressurization or there is no air when coaling, a large number of particles that are not fully burned are gathered together for deflagration, and the oxygen content does not start to rise when the fire is slowed down, and the fan operation is stopped. The return material of the returner is abnormal, the coal feeder is cut off, the load increases too quickly, the hood is damaged, the ash falls into the air chamber and the air distribution is uneven, and the bed material is too thick and the slag is not discharged in time.

When it is found that the bed temperature is abnormal, it is necessary to increase the air volume and slag discharge, reduce the amount of coal to drain the circulating ash, and try to drain the slag in the furnace room. Check the coking situation, open the manhole door to pick out the coke block, the coking is not serious, the coke block can be ignited outside the furnace, and the serious can not be treated when it is cooled and then treated. To prevent the occurrence of coking, it is necessary to control the coal particle size below 10mm, strictly control the amount of coal, when lifting the load, first clear the acacia and prepare the air to add coal, reduce the load first reduce the coal and then reduce the wind to avoid the bed temperature fluctuations, to often check the coal feeding situation and check whether the furnace flame color and the returner is normal, the operator should pay attention to the timely slag discharge and check whether there is any slag block, and close the slag discharge door after the slag is discharged.