What is the purpose of a pressurized furnace?

The purpose of a pressurized furnace is to maintain the furnace above atmospheric pressure. This design allows for several advantages: it helps in achieving better combustion efficiency by minimizing the dilution of combustion gases, enhances the control of combustion air flow, and prevents the ingress of flue gases back into the boiler, which can improve safety and efficiency.

By ensuring that the furnace operates above atmospheric pressure, it also allows for the effective management of combustion products and facilitates the use of forced draft fans to control the air and fuel mix, ultimately leading to improved thermal efficiency. Maintaining a pressurized environment can also suppress the formation of certain pollutants, leading to cleaner combustion processes.