\"Sharing Winter Freezing Prevention Experiences: Freezing of Beijing Railway Towers\"
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This post was last edited by Jiangshang Shanren on 2017-11-25 at 09:21. “Sharing experiences on preventing freezing in winter – the case of Beijing’s railway towers.” As the saying goes, it’s already unprofessional enough to not use a toilet when you have one available. There’s actually something even worse: staying in the toilet after using it. O(∩_∩)O Haha~ So disgusting...... This article does have a bit of a connection to feces; I heard that in the Northeast, people need to use a stick when urinating – how cold must it be there! ! ! I remember it was the winter of 2015 (January 22, 23, 24, 2016), and it was more severe than ever before. It was probably the coldest time during the seven years I’ve been working. Minus fourteen degrees Celsius. The entire plant is frozen and in a semi-paralyzed state. It might be the lowest temperature encountered since the plant was built; no preparations were made, and insulation and anti-freezing measures were not considered during construction. Fortunately, it was detected and dealt with in a timely manner. Freezing treatment for liquefied gas alkali scrubber towers. 1. LPG alkali liquid washing tower, with a tower diameter of 1 meter; the tower is filled with 15-20% alkali liquid, and the upper 1 meter of the tower serves as a space for the accumulation of LPG. Alkali inlet and outlet pipeline 50; alkali inlet temperature is around 40 degrees. The tower has no insulation; it has inlet and outlet alkali pipelines, with insulation but no heat tracing. The alkali liquid level at the top of the tower is controlled between 20-60, in a sawtooth pattern. (Through the base alkali discharge valve) 2. The trend of the top level in the tower is not good. Contact the instrument and go to the top of the tower together. A double-flange gauge is considered frozen, while a vent is considered blocked. After processing, heat it with a steam hose and wrap it in insulation cotton. The time limit was allowed at that time, but then it wasn’t allowed anymore. With limited staff, we can’t waste time on one table. The operator on the inside relies on experience to adjust the opening degree of the alkali discharge valve, while the operator on the outside determines the top level of the tower by considering the amount of alkali present in the liquid taken from the top buffer tank. 3. A few hours later, the liquid level in the alkali tank was below normal. Determine whether the alkali drainage line is frozen. The drain valve was opened, but there is no flow. It was parked at the alkali discharge point; steam was used to clear the alkali discharge line, but the flow rate was very low, with intermittent flow. By now it’s too late; the entire tower is unusable. Inform the senior manager to proceed with removal. Treatment: Connect a steam line at the point where liquefied gas enters the bottom of the tower; open the drain for alkali removal and blow air in gradually from the bottom. Discharge liquefied gas and alkaline solution, with steam for shielding. 【I’ve been a bit busy lately; to be continued】
I remember it was the winter of 2015 (January 22, 23, 24, 2016), and it was more severe than ever before. . . It was probably the coldest time during the seven years I’ve been working. Minus fourteen degrees Celsius. The entire plant is frozen, in a semi-paralyzed state. . It’s probably the lowest temperature encountered since the factory was built; we weren’t prepared for it, and no measures for insulation or protection against freezing were taken during construction. . . Fortunately, it was detected in time and dealt with promptly. .
We experienced the winter of 2015, when the temperature dropped to -17 degrees. One set of equipment had its pipelines freeze up due to the furnace shutting down; it took a lot of effort to resolve the issue
The processing steps can be written down, organized into a post, and used to participate in events.
This post was last edited by Da Benz on 2017-11-25 08:42 to complete it and participate in the event. Please ask the moderators of this forum to make some edits so that the main topic post is more conducive to reading and discussion.
The words may be harsh, but the truth behind them holds. It would be better to write in more detail when there’s time
1. Description: LPG alkaline liquid washing tower, filled with alkaline liquid at a concentration of 15–20%, with a volume of about 1 meter at the top of the tower reserved for LPG. The temperature of the alkaline solution entering the tower is around 40-50 degrees, and both the inlet and outlet pipes for the alkaline solution are quite thin, with a diameter of 50 millimeters. The tower has no insulation; the acid and alkali inlet and outlet pipelines have insulation, but no heat tracing. The valve is exposed with no insulation. 2. Accident course: Initially, fluctuations and inaccuracies were observed in the level gauge for the alkali solution at the top of the tower. Contact the instrument technician, and have the operator go up to the tower to handle it. Both flanged meters were frozen; they were thawed with steam and then calibrated. Wrap it with insulation foam, a cotton blanket, and steam hoses for heating. Still not allowed. The interior is under blind control. Based on experience, adjust the opening degree of the switch-type alkali discharge valve. (Refer to the amount of alkali in the liquid cutting line of the liquefied gas buffer tank at the top of the tower to determine whether the tower is at full liquid level.) ）
Whoa, did the 500 words I just wrote not get published? ?
Sad! ! Let’s give a brief summary then. . 1. LPG alkali liquid washing tower, with a tower diameter of 1 meter; the tower is filled with 15-20% alkali liquid, and the upper 1 meter of the tower serves as a space for the accumulation of LPG. Alkali inlet and outlet pipeline 50; alkali inlet temperature is around 40 degrees. The tower has no insulation; it has inlet and outlet alkali pipelines, with insulation but no heat tracing. The alkali liquid level at the top of the tower is controlled between 20-60, in a sawtooth pattern. (Through the base alkali discharge valve) 2. The trend of the top level in the tower is not good. Contact the instrument and go to the top of the tower together. A double-flange gauge is considered frozen, while a vent is considered blocked. After processing, heat it with a steam hose and wrap it in insulation cotton. The time limit was allowed at that time, but then it wasn’t allowed anymore. With limited staff, we can’t waste time on one table. The operator on the inside relies on experience to adjust the opening degree of the alkali discharge valve, while the operator on the outside determines the top level of the tower by considering the amount of alkali present in the liquid taken from the top buffer tank. 3. A few hours later, the liquid level in the alkali tank was below normal. Determine whether the alkali drainage line is frozen. The drain valve was opened, but there is no flow. It was parked at the alkali discharge point; steam was used to clear the alkali discharge line, but the flow rate was very low, with intermittent flow. By now it’s too late; the entire tower is unusable. Inform the senior manager to proceed with removal.
Treatment: Connect a steam line at the point where liquefied gas enters the bottom of the tower; open the drain for alkali removal and blow air in gradually from the bottom. Discharge liquefied gas and alkaline solution, with steam for shielding.