[Q&A Question 155] 2018.06.04
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【Q&A Question 155】June 4, 2018: Briefly explain why it is necessary to control the oxygen content in flue gas. ① Reduce heat loss； ② Prevent the acceleration of oxidation of the metal tube wall due to excess oxygen ； ③ Improve thermal efficiency. (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. The APP short-video skills competition has started! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1951670
Because a certain amount of oxygen is required to burn a specific quantity of fuel. If the oxygen content in the flue gas is too high, it indicates that too much air has been supplied. This excess air also needs to be heated to a high temperature, which takes away some of the heat and reduces the efficient use of the fuel. At the same time, this excess air is blown in by the blower, which also consumes more electricity from the blower; of course, it is also removed by the exhaust fan, and that too consumes additional electricity from the exhaust fan. However, if the oxygen content in the flue gas is too low, it will cause incomplete combustion of the fuel.
① Reduce heat loss； ② Prevent the acceleration of oxidation of the metal tube wall due to excess oxygen ； ③ Improve thermal efficiency.
Reduce heat loss; prevent accelerated oxidation of the metal tube walls due to excess oxygen; improve thermal efficiency.
The oxygen content in the boiler flue gas is a key indicator to measure the efficiency of the combustion process.
Excess oxygen content leads to energy waste, and there are environmental regulations regarding this
Save fuel and reduce fan power consumption, while improving the thermal efficiency of the boiler
Reduce heat loss; prevent accelerated oxidation of the metal pipe walls due to excess oxygen； Improve thermal efficiency.
Answer: ① Reduce heat loss； ② Prevent the acceleration of oxidation of the metal tube wall due to excess oxygen ； ③ Improve thermal efficiency.
Excess oxygen content not only leads to energy inefficiency but is also harmful to the environment; excessive levels of sulfur dioxide and nitrogen oxides in the exhaust gases cause environmental pollution, which is illegal