Methanol Purification Version – One Question per Day 20200819

1) A decrease in the circulation air volume will cause the tower temperature to rise. (2) Changes in gas composition, such as a decrease in methane content in the fresh gas, can also cause the tower temperature to rise. (3) Illusion of temperature rise caused by instrument failure

1. An improper opening degree of the main and auxiliary valves, resulting in too little cold air entering the tower or an excessive flow rate in the main line, can cause the temperature of the catalyst layer to rise. Treatment method: Open the secondary line valve to increase the amount of cooling air in the tower. If the bypass valve is already fully open, the tower temperature can be controlled by reducing the flow rate of the main valve. 2. A decrease in the circulation rate will cause the tower temperature to rise. The solution is to reduce the flow rate or close the bypass valve of the synthesis tower system in order to increase the amount of recycled gas fed into the tower. If an increase in tower temperature is caused by a tripping of the circulation pump, an emergency shutdown should be carried out; operation can resume only after the circulation pump returns to normal operation. 3. Changes in the gas composition, such as a decrease in the content of inert gases in the feed gas and a corresponding increase in the effective gases for methanol synthesis, can cause the tower temperature to rise. Handling method: Notify the gas generation station or the previous process section to adjust the components of the fresh gas. 4. Defects in the internal components of the synthesis tower can also cause the temperature of the catalyst layer in the tower to rise; for example, if some of the gas entering the tower does not undergo reaction via the catalyst and instead goes directly into the outlet pipeline of the tower. The handling method is to continue production if the defect is minor; in severe cases, shutdown for maintenance is required. 5. Malfunctioning instruments can create an illusion of rising temperatures; therefore, operators need to analyze various factors to determine whether the instruments are functioning properly, and should ask instrument technicians to inspect and repair them.

1) A decrease in the circulation air volume will cause the tower temperature to rise. (2) Changes in gas composition, such as a decrease in methane content in the fresh gas, can also cause the tower temperature to rise. (3) Illusion of temperature rise caused by instrument failure

1. An improper opening degree of the main and auxiliary valves, resulting in too little cold air entering the tower or an excessive flow rate in the main line, can cause the temperature of the catalyst layer to rise. ? ?Handling method: Open the secondary line valve to increase the amount of cooling air in the tower. If the bypass valve is already fully open, the tower temperature can be controlled by reducing the flow rate of the main valve. 2. A decrease in the circulation rate will cause the tower temperature to rise. ? ?Treatment method: Reduce the flow rate or close the bypass valve of the synthesis tower system to increase the amount of circulating gas fed into the tower. If an increase in tower temperature is caused by a tripping of the circulation pump, an emergency shutdown should be carried out; operation can resume only after the circulation pump returns to normal operation. 3. Changes in the gas composition, such as a decrease in the content of inert gases in the feed gas and a corresponding increase in the effective gases for methanol synthesis, can cause the tower temperature to rise. ? ?Handling method: Notify the gas generation unit or the previous process section to adjust the composition of the fresh gas. 4. Defects in the internal components of the synthesis tower can also cause the temperature of the catalyst layer in the tower to rise; for example, if some of the gas entering the tower does not undergo reaction via the catalyst and instead goes directly into the outlet pipeline of the tower. ? ?Handling methods: if the defect is minor, production continues; in severe cases, shutdown for maintenance is required. 5. Malfunctioning instruments can create an illusion of rising temperatures; therefore, operators need to analyze various factors to determine whether the instruments are functioning properly, and should ask instrument technicians to inspect and repair them.

1) A decrease in the circulation air volume will cause the tower temperature to rise. (2) Changes in gas composition, such as a decrease in methane content in the fresh gas, can also cause the tower temperature to rise. (3) Illusion of temperature rise caused by instrument failure

1) A decrease in the circulation air volume will cause the tower temperature to rise. (2) Changes in gas composition, such as a decrease in methane content in the fresh gas, can also cause the tower temperature to rise. (3) An illusion of temperature rise caused by faulty instruments.

1. An improper opening degree of the main and auxiliary valves, resulting in too little cold air entering the tower or an excessive flow rate in the main line, can cause the temperature of the catalyst layer to rise. ? ?Handling method: Open the secondary line valve to increase the amount of cooling air in the tower. If the bypass valve is already fully open, the tower temperature can be controlled by reducing the flow rate of the main valve. 2. A decrease in the circulation rate will cause the tower temperature to rise. ? ?Treatment method: Reduce the flow rate or close the bypass valve of the synthesis tower system to increase the amount of circulating gas fed into the tower. If an increase in tower temperature is caused by a tripping of the circulation pump, an emergency shutdown should be carried out; operation can resume only after the circulation pump returns to normal operation. 3. Changes in the gas composition, such as a decrease in the content of inert gases in the feed gas and a corresponding increase in the effective gases for methanol synthesis, can cause the tower temperature to rise. ? ?Handling method: Notify the gas generation unit or the previous process section to adjust the composition of the fresh gas. 4. Defects in the internal components of the synthesis tower can also cause the temperature of the catalyst layer in the tower to rise; for example, if some of the gas entering the tower does not undergo reaction via the catalyst and instead goes directly into the outlet pipeline of the tower. ? ?Handling methods: if the defect is minor, production continues; in severe cases, shutdown for maintenance is required. 5. Malfunctioning instruments can create an illusion of rising temperatures; therefore, operators need to analyze various factors to determine whether the instruments are functioning properly, and should ask instrument technicians to inspect and repair them.

1. An improper opening degree of the main and auxiliary valves, resulting in too little cold air entering the tower or an excessive flow rate in the main line, can cause the temperature of the catalyst layer to rise. Treatment method: Open the secondary line valve to increase the amount of cooling air in the tower. If the bypass valve is already fully open, the tower temperature can be controlled by reducing the flow rate of the main valve. 2. A decrease in the circulation rate will cause the tower temperature to rise. The solution is to reduce the flow rate or close the bypass valve of the synthesis tower system in order to increase the amount of recycled gas fed into the tower. If an increase in tower temperature is caused by a tripping of the circulation pump, an emergency shutdown should be carried out; operation can resume only after the circulation pump returns to normal operation. 3. Changes in the gas composition, such as a decrease in the content of inert gases in the feed gas and a corresponding increase in the effective gases for methanol synthesis, can cause the tower temperature to rise. Handling method: Notify the gas generation station or the previous process section to adjust the components of the fresh gas. 4. Defects in the internal components of the synthesis tower can also cause the temperature of the catalyst layer in the tower to rise; for example, if some of the gas entering the tower does not undergo reaction via the catalyst and instead goes directly into the outlet pipeline of the tower. The handling method is to continue production if the defect is minor; in severe cases, shutdown for maintenance is required. 5. Malfunctioning instruments can create an illusion of rising temperatures; therefore, operators need to analyze various factors to determine whether the instruments are functioning properly, and should ask instrument technicians to inspect and repair them.

Have the contents of the other components changed?

1. An improper opening degree of the main and auxiliary valves, resulting in too little cold air entering the tower or an excessive flow rate in the main line, can cause the temperature of the catalyst layer to rise. Treatment method: Open the secondary line valve to increase the amount of cooling air in the tower. If the bypass valve is already fully open, the tower temperature can be controlled by reducing the flow rate of the main valve. 2. A decrease in the circulation rate will cause the tower temperature to rise. The solution is to reduce the flow rate or close the bypass valve of the synthesis tower system in order to increase the amount of recycled gas fed into the tower. If an increase in tower temperature is caused by a tripping of the circulation pump, an emergency shutdown should be carried out; operation can resume only after the circulation pump returns to normal operation. 3. Changes in the gas composition, such as a decrease in the content of inert gases in the feed gas and a corresponding increase in the effective gases for methanol synthesis, can cause the tower temperature to rise. Handling method: Notify the gas generation station or the previous process section to adjust the components of the fresh gas. 4. Defects in the internal components of the synthesis tower can also cause the temperature of the catalyst layer in the tower to rise; for example, if some of the gas entering the tower does not undergo reaction via the catalyst and instead goes directly into the outlet pipeline of the tower. The handling method is to continue production if the defect is minor; in severe cases, shutdown for maintenance is required. 5. Malfunctioning instruments can create an illusion of rising temperatures; therefore, operators need to analyze various factors to determine whether the instruments are functioning properly, and should ask instrument technicians to inspect and repair them.