Product characteristics of waste heat boiler

2023-03-24

The high-temperature flue gas released from coal combustion is transported through the flue to the inlet of the waste heat boiler, and then flows through the heat exchanger, evaporator, and economizer. Then, it is discharged into the atmosphere through the chimney. The flue gas temperature is generally 150~180 ℃. The heat released by the flue gas temperature dropping from high temperature to the flue gas temperature is used to convert water into steam. The boiler feedwater first enters the economizer, where the water absorbs heat and heats up to a saturation temperature slightly below the drum pressure before entering the drum. After the water entering the drum is mixed with the saturated water in the drum, it enters the evaporator along the downcomer below the drum to absorb heat and start producing steam. Usually, only a portion of the water becomes steam, so what flows in the evaporator is a steam-water mixture. The steam-water mixture leaves the evaporator and enters the upper drum for separation through a steam-water separation device. Water falls into the water space inside the drum and enters the downcomer to continue to absorb heat to produce steam, while steam enters the superheater from the upper drum to absorb heat to convert saturated steam into superheated steam. According to the three stages of the steam generation process corresponding to three heating surfaces, namely, economizers, evaporators, and superheaters, if superheated steam is not needed, only saturated steam is needed, and superheaters may not be installed. When there is reheated steam, a reheater can be added.