What is the impact of ignition exhaust on the temperature difference across the drum wall?
Thread Content
During the ignition and pressure-raising phase, when the temperature difference across the drum wall increases, apart from stopping the heating and pressure increase and increasing blowdown, does it be beneficial to increase or decrease the air exhaust to reduce this temperature difference? Why?
The reason for the large temperature difference in the drum is that there is no steam flow inside the drum during the ignition and pressure-raising phase; the steam accumulated in the upper part of the drum turns into superheated steam as the temperature rises, while the lower part contains saturated boiler water. Enlarging the air exhaust is a way to artificially increase fluidity. To make the temperature at the top and bottom of the boiler barrel roughly the same. The same is true during shutdowns; the tank must be filled to capacity before shutting down, and water must be added continuously thereafter, otherwise a large temperature difference will also occur.