【Daily Question No. 017】2017.01.17
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The last edit to this post was made by 955559 on 2017-7-31 at 15:45. [Daily Question No. 017] On 2017.01.17, when starting up a heat exchanger, the （ ） medium should be introduced first, followed by the （ ） medium； When shutting down a heat exchanger, the （ ） medium should be stopped first, followed by the （ ） medium. (Four blanks, a total of four characters. ) The reference answers will be visible after responding; points are awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Cold, Hot, Hot, Cold – Summary of Q&A posts from 2017 (updates ongoing): http://bbs.hcbbs.com/thread-1657793-1-1.html Daily questions from 2017 – Summary post (updates ongoing): http://bbs.hcbbs.com/thread-1657794-1-1.html Summary of Q&A posts from 2016 (already updated): http://bbs.hcbbs.com/thread-1597792-1-1.html Xin Chang Cup – 2016 HaiChuan Top 10 Selection – Please recommend candidates: http://bbs.hcbbs.com/thread-1654112-1-1.html Third round of evaluation for outstanding management members at HaiChuan: http://bbs.hcbbs.com/thread-1655902-1-1.html (Source: HaiChuan Chemical Forum)
1. Catalyst poisoning, 2. Corrosion of pipeline equipment
When putting a heat exchanger into use, the (cold) fluid should be introduced first, followed by the (hot) fluid； When shutting down a heat exchanger, the (hot) fluid should be stopped first, followed by the (cold) fluid
When putting the heat exchanger into use, the (cold) fluid should be introduced first, followed by the (hot) fluid； When shutting down a heat exchanger, the (hot) medium should be stopped first, followed by the (cold) medium. (Four blanks, a total of four characters. ）