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Temperature and Pressure control relationship

6/26/2013 8:46 AM	Rate (0)
daad Gold Member Joined: 10/31/2011 Last visit: 4/8/2025 Posts: 400 Rating: (5)	Dear all, I want to control steam boiler temperature and pressure control, Is there any relationship b/w these two variables. If yes then why we use three element control systems. Regards

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6/26/2013 9:02 AM	Rate (0)
Saggy Silver Member Joined: 11/8/2011 Last visit: 10/15/2025 Posts: 387 Rating: (43)	daad Dear all, I want to control steam boiler temperature and pressure control, Is there any relationship b/w these two variables. If yes then why we use three element control systems. Regards hi daad, Three-element Control used because changes in steam flow can also cause large deviations in drum level, and could possibly trip the boiler. Changes in steam flow rate are measurable and this measurement can be used to improve level control very successfully by using a feedforward control strategy.(cascaded controls) For the feedforward control strategy, steam flow rate is measured and used as the set point of the feedwater flow controller. In this way the feedwater flow rate is adjusted to match the steam flow. Changes in steam flow rate will almost immediately be counteracted by similar changes in feedwater flow rate. To ensure that deviations in drum level are also used for control, the output of the drum level controller is added to the feedforward from steam flow.The combination of drum level measurement, steam flow measurement, and feed flow measurement to control boiler drum level is called three-element control. Hope this helps
	Last edited by: Saggy at: 6/26/2013 9:04 AM Last edited by: Saggy at: 6/26/2013 9:02 AM
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This contribution was helpful to 1 thankful Users daad

6/26/2013 9:06 AM	Rate (0)
daad Gold Member Joined: 10/31/2011 Last visit: 4/8/2025 Posts: 400 Rating: (5)	Dear Saggy, Thanks for your time.One more query is what is relationship b/w temp and pressure at any point.

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6/26/2013 9:11 AM	Rate (0)
hdhosseini Diamond Member Joined: 1/28/2009 Last visit: 1/3/2026 Posts: 6891 Rating: (1368)	daad Dear all, I want to control steam boiler temperature and pressure control, Is there any relationship b/w these two variables. If yes then why we use three element control systems. Regards Hello, such question can be answered by experts in process engineering or Boiler's manufacturer. Best regards Hamid Hosseini
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6/27/2013 7:31 AM	Rate (0)
Valli Posts: 262 Rating: (45)	Hey Look, In siemens we are not the process experts, but since we do boiler automation also, a one intersting graph is there with me which shows the relationship between Temperature and Pressure for boiler. Hope this will help you. regards Attachment Temp_Press_Boiler.pdf (191 Downloads)
Valli Posts: 262 Rating: (45)
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