Condensing compressor
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The cycle hydrogen compressor for our newly installed unit (hydrocracking) uses a condensing-type turbine. Has anyone of you worked with one before? Could you tell me how it operates?
There is not much difference between condensing compressors and back-pressure compressors; in condensing compressors, a condensing turbine is used to drive the compressor, while in back-pressure compressors, a back-pressure compressor is used for this purpose. When starting a condensing compressor, it is necessary to first activate the condensate water system before starting the compressor itself. The rest of the operations are the same as those for back-pressure compressors – it is required to activate the dry gas seal system and the lubricating oil system as well. Condensing compressors have high requirements regarding cooling water.
Briefly: 1. Use steam to warm the pipes； ⒉Introduce demineralized water into the collection tank to establish a condensate circulation system ； ⒊Activate the turning gear or turn it manually ； ⒋Steam for the steam seal in operation ； ⒌It uses a vacuum pump to create a negative pressure condition in the liquid collection tank ； ⒍Use steam to warm the machine ； ⒎Power on.
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Thank you! Do you have any relevant operating procedures? Could you send them to me? My email address is 93806404@qq.com. Thank you!
The exhaust pressure of the turbine in a condensing compressor is lower than atmospheric pressure, while that in a back-pressure type is higher than atmospheric pressure. The difference is that there is an additional condensation system. Convert vapor into water for reuse. That is, the vacuum system of the unit. A vacuum must be created before restarting. Vacuum establishment method. 1. Provide liquid level control and circulating cooling water for the large surface cooler and the small surface cooler, as well as cooling water for the vacuum pump. 2. Start the condensate pump and use the circulation valve to ensure proper liquid level in the surface condenser. 3. Introduce low-pressure steam by first activating the auxiliary pump (open the steam valve first, then the vacuum valve); once the vacuum level reaches the specified value, activate the secondary pump in addition to the primary pump. 4. Conduct a leak test on the system; the condensate generated during operation is discharged through the accident water valve. 5. Establish water seals for the safety valves of each turbine exhaust, and start the turbines to discharge steam to the surface cooler. 6. Open the system’s outlet valve to send the condensate to the refiner for circulation. This material is only for examination purposes; it was written as my own casual thoughts and is not detailed.
Thank you so much! So do you have any relevant materials? Could you send it to me? My email address is 93806404@qq.com. Thank you!
Everyone has made good points: condensing steam turbines can be equipped with extraction steam, and the extraction pressure can be determined by the user. Back-pressure turbines do not have extraction steam, but the exhaust pressure can also be set by the user, usually at 1.0 MP. Each of the two has its own advantages.