Why the boiler hoisting the first after the next, the first two sides after the middle of it
Boiler is a kind of energy conversion equipment, the energy input to the boiler has the chemical energy in the fuel, the electric energy, the boiler output has certain heat energy steam, the high temperature water or the organic
Anyway, there is only one reason that is easy to "place" and construction.
The first middle, the latter two sides are also the same reason, the middle of a good extension of the extension, if the two sides fixed, which is not good to adjust the construction of the bit.
Because the first is to be easy to combine with the group, if the following fixed, because the upper there is no adjustable margin, often have to cut the tube.
