Investigate the method used to warm the main steam pipeline in your plant’s steam turbine
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During startup with fixed parameters, which of the following two methods for warming the pipes is used in your plant: 1. The pipes are warmed only up to the front of the main steam electric valve; the pipeline between the main steam electric valve and the automatic main steam valve is warmed simultaneously with the engine； 2. During pipe warming, heat it up to the location in front of the automatic main steam valve; only after the main steam parameters meet the requirements should startup be carried out.
A manual valve is installed in front of the turbine; there is a vent in front of this manual valve. The main heating pipes need to be protected from water accumulation. The manual valve has a bypass line – open it to drain the condensate from the unit, and open the bypass line slowly
We carry out both warming up the machine and warming up the pipes; the operation can only be started once the main steam temperature reaches the specified level
3.jpg We are the second type: the heat pipe heats up to the location in front of the TTV valve, and once the steam parameters are met, rotation begins! We are Elliott’s backpressure and extraction condensing turbines!
Because I’ve seen that in some units, the pipeline between the electric valve and the automatic main steam valve (quick-shut valve) is not pre-heated; it is heated along with the machine during warm-up. However, the reason for this method of startup is not clear at present – is it to save time and improve efficiency, or is it for safety reasons?