Q&A on Purification Technology Version [020]
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How to maintain the sulfur-tolerant shift catalyst while parking or driving? Answer: When parking or driving, avoid allowing air and water to enter the catalyst bed to prevent water vapor from condensing within it. After the converter is shut down and depressurized, it should be purged with nitrogen, and a slight positive pressure should be maintained inside the furnace using nitrogen. The nitrogen used for maintaining this pressure must be dry, with an ammonia content of less than 0.5%. When the plant is started up, due to the low temperature of the pipes and equipment, steam condenses in these cold components, introducing water into the converter bed layer and thereby reducing the catalyst’s activity; therefore, it is necessary to increase the discharge volume of the system’s drain flow at the beginning of operation.
When parking or driving, prevent air and water from entering the catalyst bed to avoid the condensation of water vapor within the bed. After the converter is shut down and depressurized, it should be purged with nitrogen, and a slight positive pressure should be maintained inside the furnace using nitrogen. The nitrogen used for maintaining this pressure must be dry, with an ammonia content of less than 0.5%. When the plant is started up, due to the low temperature of the pipes and equipment, steam condenses in these cold components, introducing water into the converter bed layer and thereby reducing the catalyst’s activity; therefore, it is necessary to increase the discharge volume of the system’s drain flow at the beginning of operation.
When parking or driving, prevent air and water from entering the catalyst bed to avoid the condensation of water vapor within the bed. After the shift converter is shut down and depressurized, it should be purged with dry gas or nitrogen. To lower the temperature, blind flanges are used to isolate the shift converter from the system, and nitrogen is used to maintain a slight positive pressure inside the converter. The nitrogen used for this purpose must be dry, with an oxygen content of less than 0.5%. When restarting the converter after it has been shut down, the temperatures of the pipes and equipment are low; as a result, steam will condense in these cold pipes and equipment, thereby introducing water into the catalyst bed of the shift converter. For this reason, maintain a low water vapor ratio at the beginning of driving.
When parking or driving, prevent air and water from entering the catalyst bed to avoid the condensation of water vapor within the bed. After the shift converter is shut down and depressurized, it should be purged with dry gas or nitrogen. To lower the temperature, blind flanges are used to isolate the shift converter from the system, and nitrogen is used to maintain a slight positive pressure inside the converter. The nitrogen used for this purpose must be dry, with an oxygen content of less than 0.5%. When restarting the converter after it has been shut down, the temperatures of the pipes and equipment are low; as a result, steam will condense in these cold pipes and equipment, introducing water into the catalyst bed of the shift converter. For this reason, maintain a low water vapor ratio at the beginning of driving.
When parking or driving, prevent air and water from entering the catalyst bed to avoid the condensation of water vapor within the bed. After the converter is shut down and depressurized, it should be purged with nitrogen, and a slight positive pressure should be maintained inside the furnace using nitrogen. The nitrogen used for maintaining this pressure must be dry, with an ammonia content of less than 0.5%. When the plant is started up, due to the low temperature of the pipes and equipment, steam condenses in these cold components, introducing water into the converter bed layer and thereby reducing the catalyst’s activity; therefore, it is necessary to increase the discharge volume of the system’s drain flow at the beginning of operation.
When parking or driving, prevent air and water from entering the catalyst bed to avoid the condensation of water vapor within the bed. After the shift converter is shut down and depressurized, it should be purged with dry gas or nitrogen. To lower the temperature, blind flanges are used to isolate the shift converter from the system, and nitrogen is used to maintain a slight positive pressure inside the converter. The nitrogen used for this purpose must be dry, with an oxygen content of less than 0.5%. When restarting the converter after it has been shut down, the temperatures of the pipes and equipment are low; as a result, steam will condense in these cold pipes and equipment, introducing water into the catalyst bed of the shift converter. For this reason, maintain a low water vapor ratio at the beginning of driving.
When parking or driving, prevent air and water from entering the catalyst bed to avoid the condensation of water vapor within the bed. After the shift converter is shut down and depressurized, it should be purged with dry gas or nitrogen. To lower the temperature, blind flanges are used to isolate the shift converter from the system, and nitrogen is used to maintain a slight positive pressure inside the converter. The nitrogen used for this purpose must be dry, with an oxygen content of less than 0.5%. When restarting the converter after it has been shut down, the temperatures of the pipes and equipment are low; as a result, steam will condense in these cold pipes and equipment, introducing water into the catalyst bed of the shift converter. For this reason, maintain a low water vapor ratio at the beginning of driving.
Answer: When parking or driving, avoid allowing air and water to enter the catalyst bed to prevent water vapor from condensing within it. After the converter is shut down and depressurized, it should be purged with nitrogen, and a slight positive pressure should be maintained inside the furnace using nitrogen. The nitrogen used for maintaining this pressure must be dry, with an ammonia content of less than 0.5%. When the plant is started up, due to the low temperature of the pipes and equipment, steam condenses in these cold components, introducing water into the converter bed layer and thereby reducing the catalyst’s activity; therefore, it is necessary to increase the discharge volume of the system’s drain flow at the beginning of operation.
When parking or driving, prevent air and water from entering the catalyst bed to avoid the condensation of water vapor within the bed. After the shift converter is shut down and depressurized, it should be purged with dry gas or nitrogen. To lower the temperature, blind flanges are used to isolate the shift converter from the system, and nitrogen is used to maintain a slight positive pressure inside the converter. The nitrogen used for this purpose must be dry, with an oxygen content of less than 0.5%. When restarting the converter after it has been shut down, the temperatures of the pipes and equipment are low; as a result, steam will condense in these cold pipes and equipment, thereby introducing water into the catalyst bed of the shift converter.
When parking or driving, prevent air and water from entering the catalyst bed to avoid the condensation of water vapor within the bed. After the shift converter is shut down and depressurized, it should be purged with dry gas or nitrogen. To lower the temperature, blind flanges are used to isolate the shift converter from the system, and nitrogen is used to maintain a slight positive pressure inside the converter. The nitrogen used for this purpose must be dry, with an oxygen content of less than 0.5%. When restarting the converter after it has been shut down, the temperatures of the pipes and equipment are low; as a result, steam will condense in these cold pipes and equipment, thereby introducing water into the catalyst bed of the shift converter. For this reason, maintain a low water vapor ratio at the beginning of driving.
When parking or driving, prevent air and water from entering the catalyst bed to avoid the condensation of water vapor within the bed. After the shift converter is shut down and depressurized, it should be purged with dry gas or nitrogen. To lower the temperature, blind flanges are used to isolate the shift converter from the system, and nitrogen is used to maintain a slight positive pressure inside the converter. The nitrogen used for this purpose must be dry, with an oxygen content of less than 0.5%. When restarting the converter after it has been shut down, the temperatures of the pipes and equipment are low; as a result, steam will condense in these cold pipes and equipment, thereby introducing water into the catalyst bed of the shift converter. For this reason, maintain a low water vapor ratio at the beginning of driving.