Hydrogen compressor issues
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Friends, how do you warm up the backpressure pipeline of the steam turbine in the recycle hydrogen compressor of your hydrogenation units?
For the warm-up of the back-pressure steam turbine in our installation, back-pressure steam (low-pressure steam: 10 kg of pressure, 230 degrees) is used first to heat the pipes; the process takes about an hour to raise the temperature to around 150 degrees. Since low-pressure steam can only be used to increase the temperature initially, it is not sufficient to meet the requirements for starting up the turbine. Afterwards, main steam (medium-pressure steam: 35 kg of pressure, around 405 degrees) is used to continue heating the pipes until the temperature reaches around 275 degrees. Finally, after checking that all components are in order as required for a turbine in standby mode, the turbine is ready for standby use.
Close the steam outlet valve on the compressor’s back pressure side; after opening that valve, open the drain valve. Warm the pipes directly using 10-kilogram pipeline steam – if 35-kilogram steam cannot be used, there is no need to use 35-kilogram steam to warm the back pressure pipes. As for the inlet pipeline, it can be directly heated with 35 kilograms of steam; it’s a matter of condensate drainage and steam volume
Do you use backpressure steam to heat the interior of the unit through the backpressure steam piping?
The backpressure steam is used directly with 10-kilogram steam to warm the pipes; the one leading to the machine body is closed
The backpressure steam is used only to warm the backpressure pipeline, that is, the 10-kilogram pipeline; the vessel itself is warmed using 35-kilogram medium-pressure steam, and care must be taken to control the amount of this 35-kilogram steam
There are bypass valves on the steam pipelines at both the inlet and outlet of the turbine; during preheating, these bypass valves can be opened to allow for gradual preheating.