Pneumatic compressor steam pipe heating
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Warming the pipes of a steam turbine is very important; aside from warming the main steam pipelines, it also serves to thoroughly dehydrate the steam. The steps are simple; the main steam pipeline needs to be warmed up section by section. Before introducing steam to each main steam valve, all dehydration valves must be opened first, followed by opening the bypass valve. Wait until there is no water hammer sound before opening the main steam valve, and heat the pipes for half an hour. Then heat the next section of pipeline in sequence. When warming up the pipes, don’t rush; be sure to follow the steps, especially when warming up the pipes before the quick shut-off valve. Those who have worked on pressure compressor positions must have encountered the situation where, when starting the turbine, water comes out of the backpressure relief valve. It’s because Warm Tube wasn’t careful enough and didn’t follow the steps. This causes great damage to the turbine impeller. Also, when it gets warm enough near the isolation valve, all the turbine casing dehydration valves must be opened. We use 3.5 MPa steam; the thermometer behind the quick shut-off valve reaching over 280 degrees allows the machine to be started.
Warm pipes are divided into low-pressure and high-pressure types; it is necessary not only to ensure proper drainage of water but also to control the rates of temperature and pressure increase. During the final start-up, ensure that the pipeline has a steam superheat of over 50 degrees. For 3.5MPa steam, once the thermometer behind the quick-shut valve reaches above 280 degrees, I usually ensure an appropriate superheat and start the system by reducing the pressure slightly.
It is very important to warm the steam lines of the compressor. The compressors in our company’s DCC units also use steam at a pressure of 3.5 MPa; this steam is generated by the unit’s own gas boiler. The gas boiler is started the day before the compressor is brought online, and the steam is used to warm the valves located before the compressor. On the following morning, the pipes ahead of the quick-close valves are further warmed up. Generally, the steam temperature can reach 330 degrees at this point, after which the compressor can be started up and operated, ensuring that there is no water present in the backpressure steam.
However, after warming the pipes but before starting up the machine, the turbine must be automatically turned