【Daily Question 2019】Hydrogen production and hydrogenation section – Question No. 014
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【Daily Question 2019】Hydrogen production and hydrogenation section – Question No. 014: Briefly describe how to remove a heat exchanger Reference: Slowly close the hot medium inlet valve – simultaneously open the hot medium bypass valve – once the temperature difference is small, fully close the hot medium inlet valve – simultaneously fully open the hot medium bypass valve – fully close the outlet valve – cut off the cold medium – purge with steam – proceed with maintenance to address the issues. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) 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
①Open the hot medium bypass valve. ② Close the hot medium inlet valve. ③ Close the hot medium outlet valve. ④ Open the cold medium bypass valve. ⑤ Close the cold medium inlet valve. ⑥ Close the cold medium outlet valve
①Open the hot medium bypass valve. ② Close the hot medium inlet valve. ③ Close the hot medium outlet valve. ④ Open the cold medium bypass valve. ⑤ Close the cold medium inlet valve. ⑥ Close the cold medium outlet valve
Close the valves for hot and cold materials entering and leaving the heat exchanger； Drain the cold and hot materials from the heat exchanger.
Slowly close the hot medium inlet valve, while opening the hot medium bypass valve. When the temperature difference is not large, close the hot medium inlet valve completely, open the hot medium bypass valve completely, and close the outlet valve. Remove the cooling medium. Purge with steam and hand over to maintenance for issue resolution.
Slowly close the hot medium inlet valve – simultaneously open the hot medium bypass valve – once the temperature difference is small, fully close the hot medium inlet valve – simultaneously fully open the hot medium bypass valve – fully close the outlet valve – disconnect the cold medium – purge with steam – carry out maintenance to resolve the issue.
1. First shut down the hot side, then the cold side. 2. Allow natural cooling. 3. After the temperature has dropped, drain the media from both the tube side and the shell side completely. 4. Purge with nitrogen. 5. Install blind flanges
Reference answers: ① Open the hot medium bypass valve. ② Close the hot medium inlet valve. ③ Close the hot medium outlet valve. ④ Open the cold medium bypass valve. ⑤ Close the cold medium inlet valve. ⑥ Close the cold medium outlet valve
Slowly close the hot medium inlet valve, while opening the hot medium bypass valve. When the temperature difference is small, close the hot medium inlet valve completely, open the hot medium bypass valve fully, and close the outlet valve completely. Remove the cold medium.
Gradually close the hot medium inlet, while slowly opening the hot medium bypass valve of the heat exchanger, until it is fully closed or fully open. During the process of opening and closing the valves, pay attention to the changes in pressure and temperature before and after the heat exchanger; overheating and overpressure are strictly prohibited. After closing the inlet of the heat exchanger, close the outlet for the hot medium; the cold medium then circulates through the heat exchanger to lower its temperature. Cool down and then drain the oil; use steam to purge the heat exchanger to meet the requirements of subsequent operations.
Slowly close the hot medium inlet valve – simultaneously open the hot medium bypass valve – once the temperature difference is small, fully close the hot medium inlet valve – simultaneously fully open the hot medium bypass valve – fully close the outlet valve – disconnect the cold medium – supply steam.