Practical Exercise on Purification Technology Version [013]
Thread Content
. What are the reasons for overheating in the converter? Answer: The main factors are: 1) Oxygen in the water-gas mixture. 2) The resistance of the shift converter increases due to factors such as catalyst pulverization and caking, resulting in localized overheating in the bed. 3) When driving to pick up gas, the volume and pressure of the gas were not properly controlled. 4) The CO content in water gas is too high. 5) The system pressure rises suddenly. 6) The inlet temperature is too high.
1. High oxygen content at the converter inlet. 2. The inlet temperature of the converter is high. 3. The water-vapor ratio entering the conversion furnace increases suddenly.
1) Water-gas with oxygen. 2) The resistance of the shift converter increases due to factors such as catalyst pulverization and caking, resulting in localized overheating in the bed. 3) When driving to pick up gas, the volume and pressure of the gas were not properly controlled. 4) The CO content in water gas is too high. 5) The system pressure rises suddenly. 6) The inlet temperature is too high.
1. Water gas contains oxygen. 2. The resistance of the shift converter increases due to factors such as catalyst pulverization and caking, resulting in localized overheating in the bed layer. 3. When driving to pick up gas, the amount and pressure of the gas were not properly controlled. 4. The CO content in water gas is too high. 5. The system pressure rises suddenly. 6. The inlet temperature is too high.
1) Water gas with oxygen. 2) The resistance of the shift converter increases due to factors such as catalyst pulverization and caking, resulting in localized overheating in the bed. 3) When driving to pick up gas, the amount and pressure of gas were not properly controlled. 4) The CO content in water gas is too high. 5) The system pressure rises suddenly. 6) The inlet temperature is too high.
1. High oxygen content at the converter inlet. 2. The inlet temperature of the converter is high. 3. The water-vapor ratio entering the conversion furnace increases suddenly.
The main factors are: 1) Oxygen in the water gas stream. 2) The resistance of the shift converter increases due to factors such as catalyst pulverization and caking, resulting in localized overheating in the bed. 3) When driving to pick up gas, the amount and pressure of gas were not properly controlled. 4) The CO content in water gas is too high. 5) The system pressure rises suddenly. 6) The inlet temperature is too high.
①The O2 content in the feed gas increases. For every 0.1% increase in the temperature of the O2 catalyst bed, the temperature rises by 16–17°C. ② An increase in the CO content in the feed gas generates a large amount of reaction heat. ③Too little steam is supplied to the converter, or the superheated steam is cut off (since steam helps to remove the heat generated by the reaction); the flow rate of the hot water pump is too low, or it stops operating, resulting in less by-product steam. In severe cases, it causes excessive reduction of the catalyst, leading to a sharp rise in bed temperature. ④The inlet temperature of the converter is set too high, or the cold line is shut off or set at too low a level. ⑤The failure of the self-regulating valve, resulting in its sticking, prevents steam or cold gas from being introduced.
①The O2 content in the feed gas increases. For every 0.1% increase in the temperature of the O2 catalyst bed, the temperature rises by 16–17°C. ② An increase in the CO content in the feed gas generates a large amount of reaction heat. ③Too little steam is supplied to the converter, or the superheated steam is cut off (since steam helps to remove the heat generated by the reaction); the flow rate of the hot water pump is too low, or it stops operating, resulting in less by-product steam. In severe cases, it causes excessive reduction of the catalyst, leading to a sharp rise in bed temperature. ④The inlet temperature of the converter is set too high, or the cold line is shut off or set at too low a level. ⑤The failure of the self-regulating valve, resulting in its sticking, prevents steam or cold gas from being introduced.
Reason: ① Increased O2 content in the feed gas. For every 0.1% increase in the temperature of the O2 catalyst bed, the temperature rises by 16–17°C. ② An increase in the CO content in the feed gas generates a large amount of reaction heat. ③Too little steam is supplied to the converter, or the superheated steam is cut off (since steam helps to remove the heat generated by the reaction); the flow rate of the hot water pump is too low, or it stops operating, resulting in less by-product steam. In severe cases, it causes excessive reduction of the catalyst, leading to a sharp rise in bed temperature. ④The inlet temperature of the converter is set too high, or the cold line is shut off or set at too low a level. ⑤The failure of the self-regulating valve, resulting in its sticking, prevents steam or cold gas from being introduced.
1. The load is too low, the space velocity is slow, and the temperature of the shift converter is high； 2. Oxidizer in the gasifier.