【Q&A Question 024】2017.01.24
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This post was last edited by 955559 on 2017-7-21 at 12:40. [Q&A Question No. 024] 2017.01.24: What is the purpose of using nitrogen in the device? The reference answers will be visible after responding; scoring is granted by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The main functions of nitrogen in the device are: (1) Using nitrogen to purge the device during startup, shutdown, and accident handling ； (2) Used for sealing and isolation of compressors ； (3) Used for isolating air in fuel tanks and various containers ； (4) Used for pressure control in the tower ； (5) For fire fighting purposes. (6) Reactor purging after emergency shutdown. The New Normal Cup – 2016 HaiChuan Top 10 Members voting is now underway; please vote for the members you consider the most outstanding (please cast your valuable vote for those in the petrochemical sector). http://bbs.hcbbs.com/thread-1667649-1-1.html Summary post of Q&A questions for 2017 (updates available now). http://bbs.hcbbs.com/thread-1657793-1-1.html Summary post of daily questions for 2017 (updates available now). http://bbs.hcbbs.com/thread-1657794-1-1.html Summary post of Q&A questions from 2016 (already updated). http://bbs.hcbbs.com/thread-1597792-1-1.html Third phase of HaiChuan’s Outstanding Management Members selection contest. http://bbs.hcbbs.com/thread-1655902-1-1.html Petrochemical sector – “Creative Ideas for Energy Saving” campaign. http://bbs.hcbbs.com/thread-1666758-1-1.html Xiaomi phones are up for grabs. Summary post seeking chemical industry technical materials from the Petrochemical Section. http://bbs.hcbbs.com/thread-1654603-1-1.html Many prizes await you. (Source: HaiChuan Chemical Forum)
Protective gas: Firstly, nitrogen itself is not easily oxidized; secondly, by introducing nitrogen, gases such as oxygen in the system can be expelled, thereby providing protection for processes that are prone to oxidation.
The main functions of nitrogen in the plant are: (1) using nitrogen to purge the plant during startup, shutdown, and accident handling； (2) Used for sealing and isolation of compressors ； (3) Used for isolating air in fuel tanks and various containers ； (4) Used for pressure control in the tower ； (5) For fire fighting (6) Replacement of the reactor after emergency shutdown.
It is mainly used during the startup and shutdown of chemical plants: for example, for the safe handover and safe commissioning of chemical equipment, as well as as a gas source for the dry gas seal in centrifuges.
Answer 1: During shutdown for maintenance, enter the pipeline or container to remove all the gas inside, then purge it with air. Maintenance can only proceed after the analysis shows that the conditions are satisfactory. Be careful: after nitrogen purging, it is essential to purge with air; otherwise, suffocation and death may occur. 2. Nitrogen is used for purging gas equipment, containers, and pipelines when performing hot work maintenance (without entering the interior). And the analysis is satisfactory. 3. After a major overhaul of the gas system, the entire gas distribution system is purged with air before starting up; once the furnace is in operation, it is purged with gas again, and then the gas is supplied to the users.
(1) Use nitrogen for purging and displacement during startup, shutdown, and accident handling； (2) Used for sealing and isolation of compressors ； (3) Used to isolate air in fuel tanks and water filling tanks ； (4) Used for pressure control in the tower ； (5) Used for fire fighting, etc