Condenser is the main function of the mixed gases from the vacuum tank is above 100 ℃ in the steam section a condensed liquid below 25 ℃, so be extra strong cooling capacity, cooling effect is especially good. Generally, the condensing power should reach more than 3/4 of the rated power (i.e. evaporator power) of VPD equipment.
The structure of the condenser is a tube-shell heat exchanger. The air flow is cooled sufficiently by the multi-layer baffle plate in the shell path of the airflow. The main inlet and outlet pipes are divided into multiple branches in the condenser to form sufficient condensation area. Because of the large amount of cooling water, the VPD equipment needs to have a special cooling water station or a chiller to supply circulating cooling water for it.
The cooling water temperature has a great influence on the working performance of the condenser. The lower the water temperature is, the stronger the water catching ability is, and the lower the water vapor pressure in the residual gas after condensation. General leaking pump can withstand the biggest water vapor partial pressure is about 3 kpa, the corresponding water vapor saturation temperature 24 ℃, requiring export condenser shall not exceed 24 ℃, the temperature of the mixture of oil and gas otherwise there will be too much water vapor into the drain pump, affecting its normal work; Cooling water needs to be colder, which is not guaranteed in many parts of China during the summer months. In recent years, to strengthen the condensation effect, has a main condenser of VPD equipment use cold water cooling unit. Or in the collection tank and leakage of pumps in series between a small condenser cooling water provided by the chiller, further reduce the water vapor in the residual gas and kerosene steam partial pressure.
Condensation system work pressure is also very critical. Obviously. If the condenser and the total pressure ratio of collecting cans when saturated vapor pressure of water temperature for 3 kpa is low, is impossible to condense water vapor, all will be drain pump away. The condensation pressure must be higher than the saturated vapor pressure if the steam is to be sufficiently condensed. But the cooling system pressure is too much. Because the cooling system pressure is too high, insist on higher gas pressure of vacuum tank, otherwise unable to mix in differential pressure under the action of naturally into the condenser, and the vacuum tank pressure is too high and direct influence of insulating material within the outward diffusion of water vapour. Considering the above two factors, and consider the existence of permanent gas in the residual gas composition, selected the working pressure of 4.5 kPa condenser, water can be ensured yan gas condensation in full, and no longer YanFa, as far as possible and make the vacuum tank pressure is low.
In a complete set of VPD equipment, there is also an auxiliary condenser in the condensing system, which is specially designed to receive the high temperature kerosene vapor discharged from the distillation chamber at the later stage of purifying kerosene. The structure of the auxiliary condenser is the same as that of the main condenser. The power of the condenser corresponds to that of the distilling chamber, and the condensing kerosene liquid is discharged to the collecting tank.
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