[Production Version] Daily Question 2018-6-10 (Short Answer)
Thread Content
What are the disadvantages of excessively high and low gas temperatures after water cooling of syngas? Answer: If the temperature of the gas after water cooling of the syngas is controlled too high, it will affect the condensation of methanol and water vapor in the gas. As the water cooling temperature of the syngas increases, the amount of methanol that remains uncondensed in the gas rises; this methanol not only increases the energy consumption of the circulation compressor but also hinders the synthesis of methanol into its desired products within the methanol synthesis tower. However, the water cooling temperature of the syngas does not need to be controlled too low either. As the water cooling temperature decreases, the condensation effect of methanol increases accordingly, but when the temperature drops below 20°C, the increase in methanol’s condensation effect becomes less significant. Therefore, pursuing excessively low water cooling temperatures is uneconomical; it not only requires more sophisticated equipment but also increases the consumption of cooling water. During normal operation, the water temperature of the cooled syngas is controlled at 20-40°C.
Too low: Increased energy consumption for circulating water. Too high: Difficulties in methanol separation, liquid carried in the recycled gas, liquid impact on the compressor, which can damage the compressor; it may even enter the synthesis tower, causing a drop in the temperature of the catalyst bed and thereby worsening the synthesis reaction and reducing catalyst activity
If the temperature of the gas after cooling in the synthesis process is controlled too high, it will affect the condensation of methanol and water vapor in the gas. As a result, the amount of methanol that remains uncondensed in the syngas increases; this methanol not only raises the power consumption of the compressor but also inhibits the methanol synthesis reaction within the synthesis tower. There is also no need to keep the temperature of the gas after cooling it with water at too low a level. When the gas temperature drops below a certain threshold, the improvement in methanol condensation is not significant; therefore, striving for an excessively low cooling temperature is not economical.
Too low: Increased energy consumption for circulating water. Too high: Difficulties in methanol separation, liquid carried in the recycled gas, liquid impact on the compressor, which can damage the compressor; it may even enter the synthesis tower, causing a drop in the temperature of the catalyst bed and thereby worsening the synthesis reaction and reducing catalyst activity
Too low: Increased energy consumption for circulating water. Too high: Difficulties in methanol separation, liquid carried in the recycled gas, liquid impact on the compressor, which can damage the compressor; it may even enter the synthesis tower, causing a drop in the temperature of the catalyst bed and thereby worsening the synthesis reaction and reducing catalyst activity
Too low: Increased energy consumption for circulating water. Too high: Difficulties in methanol separation, liquid carried in the recycled gas, liquid impact on the compressor, which can damage the compressor; it may even enter the synthesis tower, causing a drop in the temperature of the catalyst bed and thereby worsening the synthesis reaction and reducing catalyst activity
If the temperature of the gas after water cooling of the syngas is controlled too high, it will affect the condensation of methanol and water vapor in the gas. As the temperature used for water cooling of the syngas increases, the amount of methanol that remains uncondensed in the gas rises; this methanol not only increases the energy consumption of the recycle compressor but also hinders the synthesis of methanol into its desired products within the methanol synthesis tower. However, the water cooling temperature of the syngas does not need to be controlled too low either. As the water cooling temperature decreases, the condensation effect of methanol increases accordingly, but when the temperature drops below 20°C, the increase in methanol’s condensation effect becomes less significant. Therefore, pursuing excessively low water cooling temperatures is uneconomical; it not only requires more sophisticated equipment but also increases the consumption of cooling water. During normal operation, the water temperature of the cooled syngas is controlled at 20-40°C.
If the temperature of the gas after water cooling of the syngas is controlled too high, it will affect the condensation of methanol and water vapor in the gas. As the temperature for water cooling of the syngas increases, the amount of methanol that remains uncondensed in the gas rises; this methanol not only increases the energy consumption of the circulation compressor but also hinders the synthesis of methanol into its desired products within the methanol synthesis tower. However, the water cooling temperature of the syngas does not need to be controlled at too low a level. As the water cooling temperature decreases, the condensation effect of methanol increases accordingly; but when the temperature drops below 20°C, the increase in methanol’s condensation effect becomes less significant. Therefore, pursuing excessively low water cooling temperatures is not economical; it not only requires more sophisticated equipment but also increases the consumption of cooling water.
If the temperature of the gas after water cooling of the syngas is controlled too high, it will affect the condensation of methanol and water vapor in the gas. As the temperature used for water cooling of the syngas increases, the amount of methanol that remains uncondensed in the gas rises; this methanol not only increases the energy consumption of the recycle compressor but also hinders the synthesis of methanol into its desired products within the methanol synthesis tower. However, the water cooling temperature of the syngas does not need to be controlled too low either. As the water cooling temperature decreases, the condensation effect of methanol increases accordingly, but when the temperature drops below 20°C, the increase in methanol’s condensation effect becomes less significant. Therefore, pursuing excessively low water cooling temperatures is uneconomical; it not only requires more sophisticated equipment but also increases the consumption of cooling water.
If the temperature of the gas after cooling in the synthesis process is controlled too high, it will affect the condensation of methanol and water vapor in the gas. As a result, the amount of methanol that remains uncondensed in the syngas increases; this methanol not only raises the power consumption of the compressor but also inhibits the methanol synthesis reaction within the synthesis tower. There is also no need to keep the temperature of the gas after cooling it with water at too low a level. When the gas temperature drops below a certain threshold, the improvement in methanol condensation is not significant; therefore, striving for an excessively low cooling temperature is not economical.
Too high a value will affect the condensation effect; too low a value results in an insignificant condensation effect and increases energy consumption