(CO2 stripping) Correspondence between low-pressure drum pressure and production load

The essence of the problem is why the higher the production load, the lower the low-pressure drum pressure? The low-pressure steam drum produces saturated steam, and a certain pressure corresponds to a certain temperature. The lower the pressure, the lower the temperature, and the lower the temperature, the better the condensation effect of methylamine. The higher the load, the more gas needs to be condensed, and of course the only way is to reduce the steam pressure. Therefore, the corresponding relationship between low-pressure drum pressure and production load mainly depends on the actual factory factors such as the conversion rate of the synthesis tower and the stripping efficiency of the stripping tower. This post was last edited by lxq700918 on 2009-4-17 22:49 ]

Design ability: 1. Daily output is 1620 tons 2. Actual output: The current daily output is 1,800 tons, and the current ammonia volume per hour is 42.5 tons. 3. Low-pressure drum pressure: Now 3.2 kg/cm2 4, high pressure condenser structure: This post is a vertical one and was last edited by lxq700918 on 2009-4-16 20:31 ]

Design ability: 400,000 tons 1. Daily output is 1,300 tons 2. Actual output: The current daily output is 1,200 tons, and the current ammonia volume per hour is 28.5 tons. 3. Low-pressure drum pressure: Now 3.4 kg/cm2 4, high pressure condenser structure: for vertical

The pressure of the low-pressure drum corresponds to the temperature of the low-pressure drum, and also corresponds to the liquid outlet temperature of the urea synthesis tower and the liquid outlet temperature of the high-pressure ammonium methane condenser. No matter how large the production capacity is, the low-pressure drum pressure and temperature must correspond to the load size. If the daily output is 1620 or 1200, the low-pressure drum pressure should be controlled at around 0.33MPa at full load, and does not change depending on the capacity of the device. The pressure control range of the low-pressure drum is 0.33~0.55MPa.

Design ability: 1. The original design capacity is 1620 tons per day, and the daily output after transformation is 2300 tons. ； 2. Actual output: The current daily output is 2,300 tons, and the average ammonia volume per hour is 54.5 tons. 3. Low-pressure drum pressure: Now it is 0.34MPa, high pressure ammonium methane condenser structure: for vertical

1. Design ability: Daily output: 1,000 tons 2. Actual output: 875 tons. 3. Low pressure drum pressure: The corresponding low-pressure drum pressure is 0.4MPa. 4. High pressure condenser structure: Vertical

1. Design ability: The daily output is 1620 tons 2. Actual output: The current daily output is 1,680 tons 3. Low pressure drum pressure: 0.33--0.35MPa 4, high pressure condenser structure: Vertical

The reaction temperature of the high-cooler tube side of the CO2 stripping method has nothing to do with the load. It is only related to N/C and H/C. When the two parameters are constant, the temperature basically remains unchanged. However, the urea reaction heat is related to the load. When the load is large, the heat to be removed from the system is also large, which requires increasing the high-cooler tube/shell temperature difference (due to high cooling The heat exchanger area is fixed), that is, the drum steam pressure is reduced. If the steam pressure is low and the saturation temperature is low, the temperature difference will increase. For a general CO2 stripping device, the low-pressure drum steam pressure is around 0.34MPA at high load. This is because the manufacturer cannot make the heat exchange area of the high-temperature cooler large, so investment is required, 25* 3 * 1,200 pipes are purchased from abroad.

design: 1300 actual: 1160 low package: 0.38 vertical