Generally, boiler pressure is always higher than the production of saturated steam pressure, the reason is to overcome the pressure loss in the pipe or network. At present, the pressure of boiler nameplate is much higher than the pressure needed in production. The actual production pressure plus the pressure drop required to overcome all pipe resistance plus a pressure margin of 25 to 30 percent is sufficient.

Boilers are divided into fuel oil gas boilers, coal-fired boilers, biomass boilers, electric boilers. The state has strict control over coal-fired boilers, and gas boilers have more accurate temperature control. However, it is necessary to consider whether it is convenient to install gas pipelines. If it is not convenient, oil or electric boilers should be considered.

In addition to boiler output, working medium parameters, coal varieties three basic factors, there are other aspects such as external size, load volatility, water quality, air pollution, mechanization, automation degree, and the main and auxiliary machine selection. The size of the boiler should be considered in the expansion of the original boiler room. The products of different plants vary greatly in size, so the user should find out the product situation of the factory.

It’s better to select the boilers with same capacity or combustion equipment. If different, the max limitation is two models, to decrease the problems of equipment layout and management.