The crystallization tank is mainly used for the crystallization of high melting point substances in oil, and is the main equipment for winterization and fractionation in the refining workshop. This equipment is mainly used for the crystallization of high melting point substances in oil through cooling and crystallization, and the parallel use of multiple sets can realize the continuous production of the dewaxing process. The principle is to use the different freezing points of wax and oil, and use the method of cooling to crystallize the wax and separate it by filtration. The oil to be dewaxed in the tank exchanges heat with the refrigerant through the serpentine coil, and through the continuous stirring of the stirring device, the oil in the tank can be dissipated in time and cooled evenly, so as to ensure that the high melting point substances can be crystallized from the oil at an appropriate rate. To achieve the purpose of dewaxing.

The crystallization tank is mainly composed of an upper flat lower seal or a double head, a cylindrical shell and a skirt seat. The cylindrical body has a built-in cooling coil and a paddle agitator, and has an inspection port, and an oil outlet is opened on the lower seal. The power adopts a cycloidal pinwheel reducer, equipped with a frequency converter, which can adjust the speed according to the process change.

Due to the compact structure of the whole equipment, small footprint, easy to use, it can also be used in parallel, easy to operate, low labor intensity, low power consumption, frequency conversion speed regulating device, and large range of stirring speed adjustment. The unanimous trust of processing manufacturers.

So how to use the crystallization tank correctly?

During the installation and debugging process, the crystallization tank is hoisted into the reserved hole on the floor, and the bolt holes of the upper lug support (or skirt) of the tank body are inserted into the reserved anchor bolts on the floor. Align the center verticality of the stirring shaft with a hammer line, and the upper and lower bearings of the stirring shaft must be on the same vertical line. There should be no friction between the stirring blade and the cooling pipe. Before commissioning, clean up the debris inside and outside the machine, check the bolt fastening and lubrication, and pay attention to the lubrication of transmission parts such as reducers and bearings. Before feeding, it must run idling for 30 minutes according to the items of no-load operation, and check the operation again for any abnormal sound. After the dry operation is normal, start feeding again.

According to experience, strictly controlling the cooling oil temperature, strictly controlling the cooling speed, and ensuring the crystallization and crystal growth time are the key to the operation of the dewaxing section. The requirements are as follows: turn on the refrigeration unit in advance, and maintain the circulating refrigerant at about -5 ~ 10°C; open all the inner and outer coil valves of the crystallization tank to perform system circulation; when the oil in the crystallization tank is full, cool down strictly by 1 ~ Slowly cool down at a rate of 1.5°C, and the cooling rate should not be too fast or too slow. When the oil temperature drops to 26-27°C, heat-preserve and crystallize for 48-72 hours, and adjust appropriately according to the actual situation of the crystal grains. But ensure that the solid wax is fully separated from the oil, and adjust the temperature according to the coil refrigerant valve until it starts to filter. During the crystallization cooling period, it is required to stir for about 3 to 5 minutes every 20 to 30 minutes. The rotating speed is controlled to 8-12 revolutions per minute, and when the temperature of the crystallization tank drops to 26-27° C., stop stirring.