Is there any difference between the start-up nozzle (the middle one) of the vacuum pump used for evacuating the turbine and the nozzles of stage 1 and stage 2?
Thread Content
Is there any difference in power?
Ours has a strong starting nozzle capacity; using it for pumping allows the target value to be reached quickly.
The starting nozzle is technically known as a start-up extraction pump; it has a high power rating (high steam consumption) and is primarily used to create a vacuum in a short period of time during the startup of a turbine, thereby enabling the turbine to start up quickly. The primary and secondary nozzles are used during the operation of the turbine; they are primarily intended to draw out the trace amounts of non-condensable gases in the condenser in order to maintain its vacuum level. The steam consumption is relatively low; usually, the first and second nozzles operate in series