Weekly Question of March 26, 2017: Replies will earn 2–10 points (**No scoring will take place after it is displayed; thanks for your replies)
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This post was last edited by percy on 2017-3-26 at 11:24. Brief description of the phenomena that occur when the pressure relief system leaks. Answer: ① The vacuum level fluctuates or decreases； ②The oxygen content in the vacuum gas increases ； ③When the pressure relief system leaks severely, the pressure relief tower can experience an internal explosion, destroying the trays or packing, or even causing more serious damage.
①Its vacuum level fluctuates or decreases； Unstable operation of each side line ② Rising oxygen content in vacuum gas ； If the leakage point is at the bottom of the tower, smoke will emerge from the initial leakage site; as the leakage expands upward, air will be drawn into the tower, increasing the oxygen content in the gas and increasing the risk of flashback. ③When the pressure relief system leaks severely, the pressure relief tower can experience an internal explosion, destroying the trays or packing, or even causing more serious damage.
①Its vacuum level fluctuates or decreases； Unstable operation of each side line ② Rising oxygen content in vacuum gas ； If the leakage point is at the bottom of the tower, smoke will emerge from the initial leakage site; as the leakage expands upward, air will be drawn into the tower, increasing the oxygen content in the gas and increasing the risk of flashback. ③When the pressure relief system leaks severely, the pressure relief tower can experience an internal explosion, destroying the trays or packing, or even causing more serious damage.
①① Fluctuations or drops in vacuum level; ② An increase in the oxygen content in the vacuum gas; ③ In cases of severe leaks in the pressure reduction system, the pressure reduction tower may experience an internal explosion, which can destroy the trays or packing, or even cause more serious damage.
Answer: ① Its vacuum level fluctuates or decreases； Unstable operation of each side line ② Rising oxygen content in vacuum gas ； If the leakage point is at the bottom of the tower, smoke will emerge from the initial leakage site; as the leakage expands upward, air will be drawn into the tower, increasing the oxygen content in the gas and increasing the risk of flashback. ③When the pressure relief system leaks severely, the pressure relief tower can experience an internal explosion, destroying the trays or packing, or even causing more serious damage.
Its vacuum level fluctuates or decreases； The operation of each side line is unstable; the oxygen content in the vacuum gas is increasing ； If the leakage point is at the bottom of the tower, smoke will emerge from the initial leakage site; as the leakage expands upward, air will be drawn into the tower, increasing the oxygen content in the gas and increasing the risk of flashback. When the pressure relief system leaks severely, the pressure relief tower can experience an internal explosion, destroying the trays or packing, or even causing more serious damage.
①Its vacuum level fluctuates or decreases； ②The oxygen content in the vacuum gas increases ； ③When the pressure relief system leaks severely, the pressure relief tower can experience an internal explosion, destroying the trays or packing, or even causing more serious damage.
Firstly, there are fluctuations or drops in vacuum level, as well as variations in the operation of various measurement lines. Secondly, the oxygen content in the vacuum gas increases, or smoke may emerge from the leakage points. Finally, if the leakage is severe, the vacuum distillation tower may experience an internal explosion, resulting in the destruction of its internal components. .
Generally, when the leak size is small, no high-pitched vibrating sound caused by air passing through the leak can be heard; however, as the leak size increases, a loud vibrating noise resulting from air flowing rapidly through the leak can be heard. Therefore, the noise generated by air flow through the leak can be used to help locate the source of the leak. It is also possible to determine whether there is a leak by analyzing the data on the gas emitted from the top of the vessel. Under normal conditions, the N2 content in this gas is low; however, this value varies depending on the specific equipment, ranging from about 3% to 5%, and in some cases it can be as high as over 10% (by volume). When there is a leak in the pressure reduction system, for example, if there is a leak hole about 10 mm long and 1–5 mm wide in the oil transfer line, allowing a large amount of air to enter, a high-pitched screeching sound can be heard. Analysis shows that the N2 content in the gas from the pressure reduction system increases significantly, reaching 35–36% by volume; once the leak is sealed, the N2 content in this gas returns to normal levels.
①Its vacuum level fluctuates or decreases； ②The oxygen content in the vacuum gas increases ； ③When the pressure relief system leaks severely, the pressure relief tower can experience an internal explosion, destroying the trays or packing, or even causing more serious damage.
①Its vacuum level fluctuates or decreases； Unstable operation of each side line ② Rising oxygen content in vacuum gas ； If the leakage point is at the bottom of the tower, smoke will emerge from the initial leakage site; as the leakage expands upward, air will be drawn into the tower, increasing the oxygen content in the gas and increasing the risk of flashback. ③When the pressure relief system leaks severely, the pressure relief tower can experience an internal explosion, destroying the trays or packing, or even causing more serious damage.