[Q&A Question 245] 2017.09.03
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【Q&A Question 245】September 3, 2017: How to introduce fuel gas into the device? (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The answers to the daily questions change, and today’s answers are shown in subsequent questions. For management purposes, if you need to view content from a few days ago, please go through the summary post below. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html (Source: Haichuan Chemical Industry Forum)
①Check the fuel gas pipeline, close the relevant vent valves and drain valves, and shut off the manual valves in front of each furnace; ② Use nitrogen to purge the main fuel gas pipeline; ③ Take samples for analysis – the oxygen content in the pipeline should be ≤0.5% to be considered acceptable; ④ Contact the relevant parties, slowly open the boundary valves to fill the collection pipe with fuel gas, then direct it to the high-point vent of the heating furnace for displacement. Once this is done and the conditions are met, prepare to start the furnace
Answer: 1. Inspect and isolate the fuel gas system, and purge it with N2. 2. Sample and analyze the oxygen content in the fuel gas system (a value of O2 < 0.5% is considered acceptable). 3. Close the dual valves of the burner in front of the furnace, and activate the pressure control valve in front of the furnace. 4. Supply the heating steam to the fuel gas liquid separation tank. 5. Contact the dispatcher and slowly open the boundary valve to introduce fuel gas into the unit. 6. Drainage from the fuel gas liquid separation tank. 7. Lead the fuel gas to the front of the furnace for condensation, discharge N2 from the system, and then close it.
First, ensure proper nitrogen purging within the pipeline, then introduce the fuel gas, while simultaneously removing nitrogen
Drain the condensed liquid outside the boundary area; ensure proper nitrogen purging of the pipelines within the boundary area. Slowly introduce the fuel gas to the equipment where it is to be used, and drain any excess gas at the far end
When using nitrogen to displace the fuel gas system, pay attention to every corner. Sample and analyze the oxygen content in the fuel gas system (a value of O2 < 0.5% is considered acceptable). Close the manual valve in front of the furnace, and activate the pressure control valve in front of the furnace. Before introducing fuel gas into the unit, it is necessary to check that all valves related to the vent lines are closed.
To introduce the fuel gas, there must be a blind flange behind the valve that connects to the main pipeline before doing so. First, replace the fuel gas lines in my system with nitrogen until the oxygen content, as measured by analysis, is below 0.1%, and then pressurize the system to a slight positive pressure. Ensure that all condensate vent valves are closed and that the flow path is unobstructed; after that, install the blind flange to allow the fuel gas to flow in
Check the system process and sample to analyze the oxygen content in the fuel gas system (a value of O2 < 0.5% is considered acceptable). Close the manual valve in front of the furnace, and activate the pressure control valve in front of the furnace
When using nitrogen to displace the fuel gas system, pay attention to every corner. Sample and analyze the oxygen content in the fuel gas system (a value of O2 < 0.5% is considered acceptable). Close the manual valve in front of the furnace, and activate the pressure control valve in front of the furnace.
When using nitrogen to displace the fuel gas system, pay attention to every corner. Sample and analyze the oxygen content in the fuel gas system (a value of O2 < 0.5% is considered acceptable). Close the manual valve in front of the furnace, and activate the pressure control valve in front of the furnace.
(1) Inspect and isolate the fuel gas system, and purge it with N2. (2) Sample and analyze the oxygen content in the fuel gas system (a value of O2 < 0.5% is considered acceptable). (3) Close the dual valves of the furnace front burner, and activate the furnace front pressure control valve. (4) Supply the heating steam to the fuel gas separation tank. (5) Contact the dispatcher and slowly open the boundary valve to introduce fuel gas into the unit. (6) Drainage from the fuel gas liquid separation tank. 5 (7) Lead the fuel gas to the front of the furnace for condensation, discharge N2 from the replacement system, and then close it.