The Application of Jet Vacuum Pump in Vacuum Distillation Ma Shengjun Zhao Xingfeng Zhang Wenfeng Li Junhong 9 Keoli Petrochemical Plant, Dongying, Shandong 257500, China; Application effects, analyzing the advantages and disadvantages of each, and summarizing that the jet vacuum pump is the best vacuum equipment for vacuum distillation.
Mulan Petrochemical Plant has a crude oil processing capacity of 1.5 million tons/year, 500,000 tons/year of atmospheric and vacuum units (referred to as I Chang) and 1 million tons/year of atmospheric and vacuum units (referred to as “regularâ€) units. Vacuum pumping system is the core part of vacuum distillation, vacuum distillation and conveying materials and other processes, and maintain the tower vacuum, commonly used vacuum pumping equipment W type mechanical reciprocating pump, water ring pump, jet vacuum pump.
2 Working principle 2.1 Jet vacuum pump working principle, 0.8 ~ 1.0MPa steam through the jet vacuum pump nozzle, pressure energy into speed energy, outlet speed 1000 ~ 14000 / s, absolute pressure is about 2500Pa, so that the nozzle exit vacuum, will receive the indoor The non-condensable gases and the ingestion and entrainment of oil and gas and water vapor are forced into the mixing chamber for molecular diffusion, energy exchange, and velocity equalization. The high-speed airflow is pressurized by the diffuser tube, the flow rate lowers the pressure, and finally the pressure rises to meet the discharge. The request.
2.2 Diagram of vacuum system flow After steam passes through DN150 primary air evacuator, the temperature of air flow is 1512. It is cooled by an air cooler. In the first air leg, the vapor and liquid phases are separated; the separated vapor phase enters into the second stage evacuator. DN80, secondary air cooler, secondary air leg, vapor-liquid two-phase separation; separated vapor phase into three-stage evacuator DN40, three-stage air cooler, three-level air leg, vapor phase into the vacuum gas tank for heating Furnace fuel; The liquid phases separated by the first, second, and third atmospheric legs enter the reduced-scale oil and gas separator with water seal.
2.3 Sketch map of jet vacuum pump Received Date:2002-06-05 Design and installation supervision of petrochemical equipment.
Convergence angle, outlet expansion angle, throat length, and total length, d are the key parameters of the nozzle. The throat diameters of the first, second, and third stage evaporator nozzles of the Wollilite Petrochemical Company are respectively 24.5, 11.9, and 10.3 mm; the air flow velocity increases here to Local sound speed ~ 3340/1; D, 1, 2, L, L0 represents diffuser throat diameter, inlet convergence angle, outlet expansion angle, throat length, total length, D is the key parameters of the diffuser pipe; Kenli Petrochemical One, The throat diameters of the second and third stage evaporator diffusers are 188.6, 51.4 and 26.2 mm, respectively. The effect is that the airflow velocity is reduced to the local sound velocity of ~334 s;
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