[Methanol Technical Version] Process Questions, July 17
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This post was last edited by qy576100527 on 2017-7-18 09:13. To increase the popularity of this section, daily quizzes on equipment, processes, and safety are held; the purpose of these quizzes is: \"Knowledge is acquired through accumulation.\" I hope everyone will participate actively; by learning and making progress, they can also earn wealth. What are the reasons for a decrease in the inlet pressure of the synthesis tower? Answer: If a sudden or gradual decrease in the inlet pressure of the synthesis tower is observed during operation, it should be taken seriously, and the cause must be identified. (1) A sudden decrease in the amount of fresh gas will cause a drop in the inlet pressure of the synthesis tower. (2) Loss of control over the liquid level in the crude methanol separator caused gas leakage. (3) Leaks caused by damage to the equipment and pipelines of the synthesis system. (4) The pressure gauge is malfunctioning. Participation: Prize 1 Wealth ； Correct answer: Reward of 5-10 wealth points ； Note: Questions for that day are valid only on that day; this post is valid for 24 hours.
(1) A sudden decrease in the amount of fresh gas can cause a drop in the pressure at the inlet of the synthesis tower, primarily due to a compressor failure that leads to its shutdown. Solution: Quickly mobilize resources to start the backup compressor and restore air supply as soon as possible. At the same time, the operator of the synthesis tower should pay close attention to the tower temperature; before the compressor resumes normal gas supply, the circulation rate of the synthesis tower should be reduced accordingly, and the flow rates in the main and auxiliary lines adjusted to stabilize the reaction temperature in the synthesis tower.
1. A sudden decrease in the flow rate of fresh gas can cause a drop in the pressure at the inlet of the synthesis tower. 2. Loss of control over the liquid level in the crude methanol separator can lead to gas leakage. 3. Damage to the equipment and pipelines in the synthesis system can result in leaks. 4. Faulty pressure gauges.
1. A sudden decrease in the flow rate of fresh gas can cause a drop in the pressure at the inlet of the synthesis tower. 2. Loss of control over the liquid level in the crude methanol separator can lead to gas leakage. 3. Damage to the equipment and pipelines in the synthesis system can result in leaks. 4. Faulty pressure gauges.
1. The amount of fresh gas coming from the previous section has decreased； 2. Low separator level causing air leakage ； 3. There are air leaks in the system equipment ； 4. Large air release volume ； 5. Increase in air velocity ； 6. Good reaction conditions
Reason: 1. Influenced by previous processes such as gasification, purification, or air separation for gas production, the amount of syngas is low, which affects the pressure entering the tower. 2. The poor working efficiency of the gas compression machinery results in an inability to deliver sufficient amount of gas, leading to low pressure at the tower inlet. 3. The effective gas components in the syngas are low; after purification, the gas volume is small and the pressure entering the tower is low. 4. Other reasons from previous processes affect the gas volume, resulting in low pressure at the inlet to the tower.
1. Low intake air volume； 2. After replacing with a new catalyst, its activity is high, resulting in a higher synthesis efficiency; consequently, the inlet pressure also decreases accordingly ； The overall pressure is low, so the inlet pressure also decreases accordingly ； 3. There is internal leakage in the alcohol release valve of the synthesis system, or the operators are not diligent enough; fearing accidents caused by liquid presence, they open the alcohol release valve wider, which results in syngas entering the storage tank along with methanol. This leads to a loss of syngas and a decrease in system pressure, as well as a drop in the inlet pressure ； 4. The system circulation rate increases; even after adjustment via branch valves, it is difficult to observe quantitatively when the valves are in an open position ； After replacing the valve or impeller of the circulator, the air induction volume increases, which causes a change in the system’s synthesis volume and results in low system pressure.
Compressor trip, pipeline leaks, etc
Decreased lung capacity； Scaling and blockage of the syngas compressor ； Large amount of exhaust gas released ； The synthesis result is not satisfactory
(1) A sudden decrease in the amount of fresh gas will cause a drop in the inlet pressure of the synthesis tower. (2) Loss of control over the liquid level in the crude methanol separator caused gas leakage. (3) Leaks caused by damage to the equipment and pipelines of the synthesis system. (4) The pressure gauge is malfunctioning.
(1) A sudden decrease in the amount of fresh gas will cause a drop in the inlet pressure of the synthesis tower. (2) Loss of control over the liquid level in the crude methanol separator caused gas leakage. (3) Leaks caused by damage to the equipment and pipelines of the synthesis system. (4) The pressure gauge is malfunctioning.