【Daily Question 2019】Hydrogen production and hydrogenation section – Question No. 067
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【Daily Question 2019】Hydrogen production and hydrogenation section – Question No. 067: What are the symptoms of tube leakage in the reaction feed heater, and what are the causes of such leakage? 1) Rapid rise in furnace temperature. 2) The furnace pressure and oxygen content fluctuate significantly. 3) The heating furnace is emitting black smoke. 4) The furnace is on fire and the tube wall temperature is extremely high. Defects in the furnace tube material. 2) Prolonged operation at excessive temperatures and under overload conditions. 3) Severe coking or dry burning of the furnace tubes. (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
1) Defects in the furnace tube material. 2) Prolonged operation at excessive temperatures and under overload conditions. 3) Severe coking or dry burning of the furnace tubes. The furnace temperature rises rapidly, with large fluctuations in furnace pressure and oxygen levels; the heating furnace emits black smoke, the furnace catches fire, and the tube wall temperatures become extremely high.
The temperature rises too quickly, pressure fluctuations are significant, and the furnace tubes coking
1. The furnace temperature rises rapidly； 2. The heating furnace is emitting black smoke ； 3. Furnace tube coking ； 4. Fluctuations in furnace pressure and oxygen content ； 5. Prolonged overheating and overloading.
Phenomenon: Decreased oxygen content, increased furnace temperature, and black smoke coming from the chimney. Reasons: Burnthrough of the furnace tube, sand holes in the furnace tube, leakage caused by prolonged erosion of the raw material tube, and cracks in the welds of the furnace tube.
1) The furnace temperature rises rapidly. 2) The furnace pressure and oxygen content fluctuate significantly. 3) The heating furnace is emitting black smoke. 4) The furnace is on fire and the tube wall temperature is extremely high. Defects in the furnace tube material. 2) Prolonged operation at excessive temperatures and under overload conditions. 3) Severe coking or dry burning of the furnace tubes.
1) The furnace temperature rises rapidly. 2) The furnace pressure and oxygen content fluctuate significantly. 3) The heating furnace is emitting black smoke. 4) The furnace is on fire and the tube wall temperature is extremely high. Defects in the furnace tube material. 2) Prolonged operation at excessive temperatures and under overload conditions. 3) Severe coking or dry burning of the furnace tubes.
Phenomenon: The furnace temperature and flue gas temperature rise suddenly, black smoke emerges from the chimney, and the interior of the furnace cannot be seen. When the rupture is severe, oil flows around the furnace and catches fire, and the pressure of the feed pump drops. Reason: Generally, furnace tube failures occur due to long-term neglect of maintenance; issues such as swelling, bubbling, peeling of the tube surface, and darkening of its color often lead to rupture. ● Local overheating of the furnace tube: such as fuel gas containing oil being injected into the furnace tube and burning there ； The burner is not aligned, causing the flame to shoot straight at the furnace tubes ； ● Bias current in several channels of the radiant furnace tube causes overheating. ● The furnace tubes have been neglected for a long time; defects were detected over time ； The quality of the furnace tube is poor, resulting in sand holes or cracks due to high-temperature oxidation and erosion by the oil. ● Quality defects remaining from the furnace tube maintenance.