Water temperature control for burners in space furnaces and shell furnaces

This water temperature should be related to the pressure in the burner cooling water buffer tank. Temperature control is primarily aimed at preventing dew point corrosion and high-temperature sulfidation corrosion at the burner head, thereby extending the burner’s service life; the oxygen preheater is also designed for this purpose.

There are still certain differences between the design concepts of aerospace and those of shells. Regarding burners, Shell’s burners are independent systems similar to steam drums; they can be raised to the operating pressure or lowered to atmospheric pressure as needed. However, this is not the case for those used in aerospace applications, where it is necessary to maintain a certain pressure difference between the furnace pressure and the burner pressure, in order to prevent damage to the burner due to pressure on one side only. Even after the shell is stopped and depressurized, the burner can still maintain a high pressure and temperature; however, in the case of space furnaces, the burner must be depressurized, which leads to cavitation in the pump due to the high temperatures.

The two people upstairs explained it quite well; the burner cooling water system is one of the three main protection mechanisms for rocket furnace burners. Its temperature control system is relatively simple, but it remains very important. When the temperature is low, the steam used as a vaporizing agent may condense at the oxygen outlet of the burner, resulting in dew point corrosion ； If the temperature is too high, the burner tip may not be able to cool down, leading to high-temperature sulfur corrosion; this could in turn cause cavitation in the pump below. However, this shouldn’t happen, as the pump is designed to match the requirements after the process system has been designed. In short, the choice of temperature is based on minimizing it as much as possible while preventing dew point corrosion, in order to extend the service life of the burner.

What are the three main protections for space furnace nozzles? One is the burner purge gas, one is the burner water, and then there’s pressure difference control or something like that? However, in actual production processes, there is indeed a possibility of pump cavitation due to low pressure! Is there any good way to solve this?