【Q&A Question 192】2018.07.17
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【Q&A Question 192】July 17, 2018: Briefly explain why it is important to control the pressure at the top of the stripping tower What is the impact of pressure levels on operations? A stable control of the pressure at the top of the stripping tower helps to remove H2S and other light components from the stripped diesel, ensuring that the product quality meets standards ； Controlling a certain pressure at the same time is to ensure a sufficient pressure difference for transporting dry gas out of the device. High pressure: The light components dissolved in diesel do not vaporize completely, affecting the flash point and corrosion resistance of the refined diesel ； Furthermore, operating under high pressure is not permitted under the equipment’s process conditions, which may lead to safety valve activation accidents. Low pressure: The solubility of diesel decreases, resulting in an improved quality of the refined diesel. With the feed temperature remaining unchanged, the initial boiling point of diesel rises, its boiling range narrows, and the yield of diesel decreases. Furthermore, when pressure decreases, the inlet head of pumps such as return pumps and sulfur-containing wastewater pumps drops, and fluctuations in the liquid level may cause the pumps to go into vacuum. (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 skill competition has begun! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1951670
Control the pressure at the top of the stripping tower; this is necessary to maintain stability and to help remove H2S and other light components from the distilled diesel, thereby ensuring that the product quality meets the required standards； Controlling a certain pressure at the same time is to ensure a sufficient pressure difference for transporting dry gas out of the device. High pressure: The light components dissolved in diesel do not vaporize completely, affecting the flash point and corrosion resistance of the refined diesel ； Furthermore, operating under high pressure conditions is not permitted by the equipment’s process requirements, which may lead to safety valve activation incidents. Low pressure: The solubility of diesel decreases, improving the quality of refined diesel. With the feed temperature remaining unchanged, the initial boiling point of diesel rises, the boiling range narrows, and the yield of diesel decreases. Furthermore, when the pressure decreases, the pump inlet head drops, and fluctuations in the liquid level can lead to pump cavitation.
Controlling the pressure at the top of the stripping tower stably helps to remove H2S and other light components from the stripped diesel, ensuring that the product quality meets the required standards； Controlling a certain pressure at the same time is to ensure a sufficient pressure difference for transporting dry gas out of the device. High pressure: The light components dissolved in diesel do not vaporize completely, affecting the flash point and corrosion resistance of the refined diesel ； Furthermore, operating under high pressure is not permitted under the equipment’s process conditions, which may lead to safety valve activation accidents. Low pressure: The solubility of diesel decreases, resulting in an improved quality of the refined diesel. With the feed temperature remaining unchanged, the initial boiling point of diesel rises, its boiling range narrows, and the yield of diesel decreases. Furthermore, when pressure decreases, the inlet head of pumps such as return pumps and sulfur-containing wastewater pumps drops, and fluctuations in the liquid level may cause the pumps to go into vacuum.
Improve the stripping efficiency, separate free ammonia and CO2, increase urine concentration, and reduce the load on the circulatory system
Controlling the pressure at the top of the stripping tower stably helps to remove H2S and other light components from the stripped diesel, ensuring that the product quality meets the required standards； Controlling a certain pressure at the same time is to ensure a sufficient pressure difference for transporting dry gas out of the device. High pressure: The light components dissolved in diesel do not vaporize completely, affecting the flash point and corrosion resistance of the refined diesel ； Furthermore, operating under high pressure is not permitted under the equipment’s process conditions, which may lead to safety valve activation accidents. Low pressure: The solubility of diesel decreases, resulting in an improved quality of the refined diesel. With the feed temperature remaining unchanged, the initial boiling point of diesel rises, its boiling range narrows, and the yield of diesel decreases. Furthermore, when pressure decreases, the inlet head of pumps such as return pumps and sulfur-containing wastewater pumps drops, and fluctuations in the liquid level may cause the pumps to go into vacuum.
Controlling pressure properly is beneficial for the separation efficiency of hydrogen sulfide gas； The pressure is high, so the gas doesn’t come out easily.
Answer: The pressure at the top of the stripping tower; stable control helps to remove H2S and other light components from the stripped diesel, ensuring that the product quality meets standards； Controlling a certain pressure at the same time is to ensure a sufficient pressure difference for transporting dry gas out of the device. High pressure: The light components dissolved in diesel do not vaporize completely, affecting the flash point and corrosion resistance of the refined diesel ； Furthermore, operating under high pressure is not permitted under the equipment’s process conditions, which may lead to safety valve activation accidents. Low pressure: The solubility of diesel decreases, resulting in an improved quality of the refined diesel. With the feed temperature remaining unchanged, the initial boiling point of diesel rises, its boiling range narrows, and the yield of diesel decreases. Furthermore, when pressure decreases, the inlet head of pumps such as return pumps and sulfur-containing wastewater pumps drops, and fluctuations in the liquid level may cause the pumps to go into vacuum.
Controlling the pressure at the top of the stripping tower stably helps to remove H2S and other light components from the stripped diesel, ensuring that the product quality meets the required standards； Controlling a certain pressure at the same time is to ensure a sufficient pressure difference for transporting dry gas out of the device. High pressure: The light components dissolved in diesel do not vaporize completely, affecting the flash point and corrosion resistance of the refined diesel ； Furthermore, operating under high pressure is not permitted under the equipment’s process conditions, which may lead to safety valve activation accidents. Low pressure: The solubility of diesel decreases, resulting in an improved quality of the refined diesel. With the feed temperature remaining unchanged, the initial boiling point of diesel rises, its boiling range narrows, and the yield of diesel decreases. Furthermore, when pressure decreases, the inlet head of pumps such as return pumps and sulfur-containing wastewater pumps drops, and fluctuations in the liquid level may cause the pumps to go into vacuum.
Maintaining stable pressure at the top of the stripping tower helps to remove H2S and other light components from the stripped diesel, ensuring that the product quality meets standards； Controlling a certain pressure at the same time is to ensure a sufficient pressure difference for transporting dry gas out of the device. High pressure: The light components dissolved in diesel do not vaporize completely, affecting the flash point and corrosion resistance of the refined diesel ； Furthermore, operating under high pressure is not permitted under the equipment’s process conditions, which may lead to safety valve activation accidents. Low pressure: The solubility of diesel decreases, resulting in an improved quality of the refined diesel. With the feed temperature remaining unchanged, the initial boiling point of diesel rises, its boiling range narrows, and the yield of diesel decreases. Furthermore, when the pressure decreases, the inlet head of P-201 and 202 drops, and fluctuations in the liquid level may cause the pump to become clogged.
Controlling the pressure at the top of the stripping tower is beneficial for stripping H2S and other light components from diesel, ensuring that the product quality meets the required standards； Controlling a certain pressure at the same time is to ensure a sufficient pressure difference for transporting dry gas out of the device. High pressure: The light components dissolved in diesel do not vaporize completely, affecting the flash point and corrosion resistance of the refined diesel ； Furthermore, operating under high pressure is not permitted under the equipment’s process conditions, which may lead to safety valve activation accidents. Low pressure: The solubility of diesel decreases, resulting in an improved quality of the refined diesel. With the feed temperature remaining unchanged, the initial boiling point of diesel rises, the boiling range narrows, and the yield of diesel decreases. Furthermore, when the pressure is low, the pump inlet pressure decreases, and fluctuations in the liquid level may cause the pump to become clogged.