[Q&A Question 217] 2018.08.11
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【Q&A Question 217】August 11, 2018: Briefly describe the common interlock settings in diesel hydrogenation units. (1) System emergency pressure relief interlock. (2) Emergency shutdown interlock for the heating furnace; (3) Interlock protection for equipment (shutdown, pump shutdown), etc. (Unless otherwise specified, all questions and answers are based on the hydrogenation unit.) ) Correct: 3 wealth, Incorrect: 1 wealth ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space through the summary post below
This post was last edited by Hasty Passerby on 2018-8-11 at 09:30. Error: Sorry, I answered the LNG question here by mistake. The interlocks for the diesel hydrogenation unit include: 1. P-102A/B interlock 2. HT-101 interlock 3. P-104A/B interlock 4. HT-102 interlock 5. P-103A/B interlock 6. K-102 interlock 7. K-101A/B shutdown interlock
(1) System emergency pressure relief interlock (2) Heater emergency shutdown interlock (3) Equipment interlock protection (shutdown, pump shutdown)
Generally, the following interlock devices are installed: 1. Low-low level interlock for the raw material buffer tank; 2. Start/stop interlock for the high-pressure feed pump; 3. Stop interlock for the hydraulic turbine; 4. Low-low flow rate interlock at the outlet of the hydrogenation feed pump; 5. Low-low flow rate interlock for the recycled hydrogen; 6. Low-low flow rate interlock for the reaction feed to the heater; 7. Stop interlock for the reaction feed heater; 8. Low-low pressure interlock for the main fuel gas nozzles in the reaction feed heater; 9. Low-low pressure interlock for the pilot light nozzles in the reaction feed heater; 10. Low-low pressure interlock for the air supply in the reaction feed heater; 11. High-level interlock for the liquid level in the cold fractionator; 12. Emergency pressure relief interlock; 13. Start/stop interlock for the compressor, along with alarm functions for the main process operating parameters.
(1) System emergency pressure relief interlock. (2) Emergency shutdown interlock for the heating furnace (3) Interlock protection for equipment
Generally, the following interlock devices are installed: 1. Low-low level interlock for the raw material buffer tank; 2. Start/stop interlock for the high-pressure feed pump; 3. Stop interlock for the hydraulic turbine; 4. Low-low flow rate interlock at the outlet of the hydrogenation feed pump; 5. Low-low flow rate interlock for the recycled hydrogen; 6. Low-low flow rate interlock for the reaction feed to the heater; 7. Stop interlock for the reaction feed heater; 8. Low-low pressure interlock for the main fuel gas nozzles in the reaction feed heater; 9. Low-low pressure interlock for the pilot light nozzles in the reaction feed heater; 10. Low-low pressure interlock for the air supply in the reaction feed heater; 11. High-level interlock for the liquid level in the cold fractionator; 12. Emergency pressure relief interlock; 13. Start/stop interlock for the compressor, along with alarm functions for the main process operating parameters.
Emergency pressure relief interlock, hydrogen feed cut-off interlock, reactor feed heater shutdown interlock logic, constant flame burner interlock logic, circulating hydrogen cut-off interlock logic, distillation column bottom reboiler shutdown interlock logic, distillation column reboiler constant flame shutdown interlock, flue gas venting interlock, natural ventilation activation interlock, new hydrogen compressor shutdown interlock, conditions for allowing the start of the new hydrogen compressor, conditions for automatic startup of the auxiliary lubricating oil pump, interlock for starting and stopping the water supply pump for the new hydrogen compressor, turbine shutdown interlock logic, conditions for allowing the start of the hydrogen feed pump, interlock for cutting off the feed water pump, conditions for allowing the start of the feed water pump, conditions for allowing the start of the main pump, interlock for cutting off the lean solvent in the circulating hydrogen desulfurization tower, interlock logic for the lean solvent pump in the circulating hydrogen desulfurization tower, air cooler shutdown interlock logic.
The interlock points in a typical diesel hydrogenation unit include mutual interlocking and self-protection mechanisms between the compressor, the reaction feed pump, the gas feed, the emergency vent system, and the heater. The purpose of interlocking is to ensure that, in emergency situations, the hydrogen-handling system does not experience overpressure, and that the reactor does not reach excessive temperatures or experience a temperature spike, thereby preventing the catalyst from coking or accumulating carbon deposits. Local interlock points: First, the interlock protection mechanisms built into the compressor itself (lubricating oil pressure, cooling water, motor temperature, cylinder temperature, etc.); second, the interlock protection mechanisms of the reaction feed pump itself (lubricating oil pressure, cooling water, and bearing temperature); third, the interlock protection mechanisms of the high-pressure injection pump itself (lubricating oil pressure, cooling water, and bearing temperature). The purpose of interlocking is to prevent damage to the pump itself.
1. Emergency pressure relief interlock system； 2. Emergency shutdown interlock for the heating furnace ； 3. Interlock protection of the equipment (shutting down, stopping pumps)