The crew’s communication during synthesis
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That technician helped me answer a question: why does the synthesis process need to be stopped when the vacuum level in the unit’s steam condenser drops below -70 KP? Unit cycle. Thank you
In our plant, when the vacuum level of the turbine unit’s condenser drops to -40 KP, the system triggers an automatic shutdown; at -60 KPa, production is reduced. It is likely that the low vacuum level results in uneven heating of the low-pressure cylinder of the turbine, leading to poor performance and a decrease in speed; therefore, it is necessary to reduce the load or shut down the turbine.
As the vacuum level decreases, the economic efficiency of operation drops, and this also affects the safety of the turbine’s operation. At this point, the exhaust temperature rises, and changes in the rotor’s thermal alignment can cause vibrations; often, vibrations increase significantly at the rear part of the turbine. The temperature of the rear bearings also rises as a result, which impacts the performance and safety of the condenser!
1. The steam utilization efficiency of the turbine decreases, resulting in poorer economic performance. 2. An increase in the condenser pressure leads to a decrease in rotational speed, which in turn causes a slight drop in the pressure at the compressor outlet; this can result in surge. 3. An increase in the condenser pressure leads to an increase in the temperature of the exhaust cylinder. Solution: Identify the cause of the increased pressure and eliminate it as soon as possible. If it cannot be resolved in a short time, reduce the load first. If the pressure continues to rise, it will be necessary to shut down the unit to protect it. These are purely my personal opinions; I hope everyone will continue to share their views and learn from one another*