Reasons why the back tube plate of chain grate boilers cracks
For boilers,the crack of accessories is one of the important reasons which shorten its service life and cause safety accident,therefor,we should pay a high attention to the cracks of the chain grate boilers.
In the operation of chain grate boiler,the back tube plates must undergo the radiation of high temperature ,its work environmental is worst,so,it easily cracks.The relevant engineers form Zhengzhou Boiler will give us the following reasons why the back tube plate of chain grate boilers cracks in detail.
When the bracing weld of the tube plate’s upper gusset of chain grate boiler cracks,arcuate plate can not be strengthened by bracing,in the changing pressure,the fatigue crack of back tube plate will come out.When the smoke tube and tube plate are connected by welding, the pipe extends the length, the end of the tubes is overheated and cracks, the crack may be extended to the tube plate.
Near the tube plate,regional poor water circle of chain grate boiler will happen,which leads to the vaporization of the regional water inside the tube plates because of the high temperature smoke and large heat load,then,subcooled boiling forms,it makes the tube plates lose efficacy because of regional overheating.So,unright feedwater and water treatment will cause the cracks of the back tube plate of chain great boiler.
In the peak of the heat load,adjusting the combustion in furnace by adding fuel frequently and taking out the fire door leads to a huge change of the temperature,which will cause the cracks of the tube plate.
Without water treatment of chain grate boiler,some people use overweight and long time alkaline detergents to descaling,it will cause the cracks of tube plate because of embrittlement. At the same time,the engineers from Zhengzhou Boiler producing chain grate boilers indicates that intermittent heating,using circulating pump frequently,the excessive loss of water of system and adding the water of low temperature will also cause the cracks of the back tube plate of chain grate boilers.
