【Q&A Question 199】2017.07.18
Thread Content
This post was last edited by liuquan1100 on 2017-8-7 22:05. [Q&A Question 199] 2017.07.18: What measures can be taken to prevent and reduce low-temperature dew point corrosion in heating furnaces? The reference answers will be visible after replying; scoring is based on identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Note: For questions of the type \"one question per day,\" if a person replies continuously for a month, that is, posts more than 30 times, their score will be assigned as 2 points, which is the lowest possible score. Click once to reply; if multiple replies are made, points will be awarded as appropriate, as deleting posts is also a waste of time. ①Increase the air temperature at the inlet of the air preheater, or control the wall temperature of the heat exchange surface during design ； ②Use corrosion-resistant materials ； ③Low-oxygen combustion is employed to control the excess air in combustion and reduce the formation of SO3 ； ④Use low-sulfur fuel to lower the flue gas dew point temperature and reduce corrosion at low temperatures. Scoring criteria: 2 Wealth points for incorrect responses; *incomplete* answers earn 3–8 points. 10 Wealth points are given for correct answers accompanied by detailed explanations; responses that are correct but lack sufficient details earn 15–20 Wealth points. Please score according to these criteria. Note: If there are editing records after answering, only points will be awarded to those who participated. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters that have nothing to do with the answer are all considered malicious spamming; points will start to be deducted after three warnings. 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 Petrochemical Sector – “Creative Ideas for Energy Savings” Campaign (Phase 2 is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html 2017 Coal Chemicals – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html
⑴Raise the air temperature at the inlet of the air preheater, or control the wall temperature of the heat exchange surfaces during design. ⑵ Use corrosion-resistant materials. ⑶ Employ low-oxygen combustion and control the excess air amount in combustion to reduce the formation of sulfur trioxide. ⑷ Use low-sulfur fuels to lower the flue gas dew point temperature and minimize low-temperature corrosion.
Use corrosion-resistant materials, control the sulfur content in the fuel gas, and maintain a temperature higher than the dew point temperature
⑴Raise the air temperature at the inlet of the air preheater, or control the wall temperature of the heat exchange surfaces during design. ⑵ Use corrosion-resistant materials. ⑶ Employ low-oxygen combustion and control the excess air amount in combustion to reduce the formation of sulfur trioxide. ⑷ Use low-sulfur fuels to lower the flue gas dew point temperature and minimize low-temperature corrosion.
Optimize gas to reduce sulfur content, use chimneys made of high-quality materials, increase the flue gas temperature, and employ low-oxygen combustion.
⑴Raise the air temperature at the inlet of the air preheater, or control the wall temperature of the heat exchange surfaces during design. ⑵ Use corrosion-resistant materials. ⑶ Employ low-oxygen combustion and control the excess air amount in combustion to reduce the formation of sulfur trioxide. ⑷ Use low-sulfur fuels to lower the flue gas dew point temperature and minimize low-temperature corrosion.
Answer: 1. Increase the air temperature at the inlet of the air preheater or control the wall temperature of the heat exchange surfaces during design; 2. Use corrosion-resistant materials; 3. Employ low-oxygen combustion, control the excess air amount in combustion, and reduce the generation of sulfur trioxide; 4. Use low-sulfur fuels to lower the flue gas dew point temperature and minimize low-temperature corrosion.
⑴Raise the air temperature at the inlet of the air preheater, or control the wall temperature of the heat exchange surfaces during design. ⑵ Use corrosion-resistant materials. ⑶ Employ low-oxygen combustion and control the excess air amount in combustion to reduce the formation of sulfur trioxide. ⑷ Use low-sulfur fuels to lower the flue gas dew point temperature and minimize low-temperature corrosion.
⑴Raise the air temperature at the inlet of the air preheater, or control the wall temperature of the heat exchange surfaces during design. ⑵ Use corrosion-resistant materials. ⑶ Employ low-oxygen combustion and control the excess air amount in combustion to reduce the formation of sulfur trioxide. ⑷ Use low-sulfur fuels to lower the flue gas dew point temperature and minimize low-temperature corrosion.