Reasons why hot water boilers coke
Hot water boiler,as one kind of industrial boiler,the function of which is providing hot water for industrial production.In so many boiler failures,boiler coking is very harmful,such as causing water vapor bursting,shortening the boiler’s service life and causing boiler fire extinction.The following reasons why hot boiler coke are given by Zhengzhou Boiler,the leading manufacturing enterprise of industrial boiler.
Unreasonable design of burner’s primary air nozzle
This mainly refers to the gas fired hot water boiler,to increase the effect of combustion stability,in the design of burner, the angle and size of combustion stabilizer is bigger,the size of nozzle shell is short.Observations show that,after the primary airflow leaves nozzle without forming a closed recirculation zone,the next airflow down rush the cold ash hopper wall obviously,increasing the tendency of coking,the rigidity of pulverized coal airflow is weak,both sides of nozzle is easy to coke.
Improper installation of refractory belt
The refractory belt of hot water boiler is easy for inertial particle to adhere to because of its high surface temperature and roughness,which leads to the coking of hot water boiler.
The potential coking property of coal
For coal fired hot water boiler,when the content of sulfate and ferric oxide is high in the coal,the coal ash grain is very easy to melt,ash containing more alkaline minerals is easy to form fusible eutectic.
Besides the above,the relevant engineer from Zhengzhou Boiler also indicates that we should avoid the coking caused by the boiler’s overload operation.The coal fired hot water boiler of Zhengzhou Boiler adopts the latest arch research product of Xi’an Jiao Tong University,downside “α”type arch technology,it improves the combustion of low equality coal and the boilers are adjusted to many kinds of coal.
