What is wet back of boilers? And what is the advantage of this tech?




The  "wet back" is a important technology of steam boilers on the boiler's smoke turning room into the inside of the pot, the pipe plate of smoke turning room, back plate and barrel of the smoke room are surrounded by pot water (i.e. immersed in the furnace water), so called "wet back" (also known as water back type).
The "wet back" type steam boiler has the following advantages and disadvantages:

Advantages of "wet back" boiler:

1, Smoke through the turning room into the smoke pipe (the first return pipe) heat exchanging. Smoke temperature has been low to the front smoke box when the (generally specific ally: about 450 degrees C), so that the structure of the front smoke box manufacturing becomes simple, generally with the steel structure lining insulation material.

2, Steam boiler's "wet back" structure can bear with high temperature, and it has advantage of sealing, and its volume is also much smaller than the "dry back" type of smoke room. Therefore, it can avoid the shortcomings of the "dry back" structure, extend the normal operating cycle of the boiler, reduce the maintenance cost, so it can be widely used.

Weaknesses of "wet back" boilers:

1, "wet back" structure of the turning room make manufacturing, assembly and repairmen with more difficult, which increase a lot of auxiliary parts, its manufacturing costs include some molds of the initial investment is higher. In addition, the number of welds, welding workload is large, increase the labor intensity of the processing people.
2, due to the factors affecting the combustion of many, sometimes there is a burning delay, which can lead to the smoke temperature of the transfer room increased, and even the absence of fuel in the smoke room continue to to burn, the consequences may cause the wet back-type smoke room front pipe plate leakage and cracks.

In conclusion, there is no the best boilers, only the most suitable boilers for customers.

 
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