In the liquid ring vacuum pump system, a return valve is installed from the separator outlet to the vacuum pump inlet return pipe, which is determined according to the operating characteristics of the liquid chlorine filling station. The liquid chlorine filling operation is intermittent, and the amount of waste chlorine gas sent to the liquid ring vacuum pump system changes with the change of the liquid chlorine filling amount. The device of the vacuum pump system is continuously running. When the waste chlorine gas discharged from the liquid chlorine filling system is reduced or stopped, it is required to open the return valve to replenish part of the waste chlorine gas to the inlet of the vacuum pump to maintain the concentrated sulfuric acid cycle and take away heat and ensure the vacuum tank. The degree of vacuum is stable.
液环真空泵系统装置在运行中存在的问题 1. Problems existing in the operation of the liquid ring vacuum pump system
After the waste chlorine gas vacuum pump system device is put into operation, the amount of waste chlorine gas discharged from the liquid chlorine filling system is unstable, resulting in large and frequent fluctuations in the pressure of the vacuum pump outlet. As a result, the vacuum degree of the imported vacuum tank cannot be guaranteed, and even the vacuum degree is lost. The positive pressure directly affects the operation of the liquid chlorine filling cylinder of the liquid chlorine filling station, which makes the liquid chlorine packaging impossible, and affects the stable production of the chlorine gas system. In severe cases, chlorine gas will leak into the air, causing environmental pollution and personnel poisoning accidents. In addition, due to the low pressure of the pump outlet, the circulating sulfuric acid is not able to remove the heat, and the vacuum pump pump casing, impeller and mechanical seal are frequently damaged due to excessive temperature and severe corrosion. The service life is shortened, increasing the vacuum pump maintenance volume and vacuum pump maintenance costs.
Through analysis, the circulating sulfuric acid interruption occurred during the operation of the waste chlorine vacuum pump system, causing the system to lose vacuum and mechanical failure. ，当小于此值时硫酸容易失去循环发生中断现象，而送往废氯气吸收塔管道为-2kPa左右，在操作中要把气液分离器出口阀关小，把分离器压力提升0.1MPa以上，以满足真空泵系统运行时循环硫酸不发生中断。 It was found that when the system is operating normally, the outlet pressure of the vacuum pump, that is, the pressure of the gas-liquid separator, must be greater than or equal to 0.1 MPa . In operation, the outlet valve of the gas-liquid separator must be closed, and the pressure of the separator should be increased by more than 0.1MPa , so that the circulating sulfuric acid will not be interrupted during the operation of the vacuum pump system. Because the operation of filling cylinders in the liquid chlorine station is to discharge waste chlorine gas between the gaps, the waste chlorine gas sent to the vacuum pump system also changes with the amount of liquid chlorine filling. When the outlet pressure of the waste chlorine vacuum pump decreases, the operator is closed or closed at this time. The outlet valve prevents the vacuum pump from circulating acid interruption. When the liquid chlorine station is filled with a large amount, the outlet pressure of the vacuum pump will rise. At this time, the operator opens a large outlet valve to prevent the pump from being damaged due to overpressure. The vacuum pump outlet pressure adjustment is manually operated, which increases the intensity of the operator. Often due to inter-post coordination problems and manual adjustments, the vacuum pump outlet pressure fluctuates greatly, the vacuum tank loses vacuum, and the vacuum pump is broken due to acid.
液环真空泵系统装置问题的解决 2.Solution of the liquid ring vacuum pump system device
In order to solve the problem that the outlet pressure of the vacuum pump due to manual adjustment is not timely, which causes equipment damage due to circulating sulfuric acid breaking and affects system production or chlorine gas leakage to pollute the environment and accidents of personnel poisoning. The technological transformation of the vacuum pump system is shown in the figure below. 进行远程监控和自动调节操作，可设置调节阀根据气液分离压力调节开度，稳定真空泵出口压力在0.1MPa ，当气液分离器压力低于设定值时（ 0.1MPa ）， DCS产生低报以提醒主控操作员通知现场操作工检查真空泵系统运行情况，循环硫酸是否中断，真空罐是否失去真空度等。 Install an automatic regulating valve at the outlet of the vacuum pump, that is, the gas-liquid separation outlet pipe, in parallel with the original manual regulating valve, install a remote pressure detection device in the gas-liquid separator, and use DCS for remote monitoring and automatic regulating operations. The regulating valve can be set according to the gas-liquid The separation pressure adjusts the opening degree and stabilizes the vacuum pump outlet pressure at 0.1MPa . When the gas-liquid separator pressure is lower than the set value ( 0.1MPa ), DCS generates a low report to remind the main control operator to notify the field operator to check the operation of the vacuum pump system , Whether the circulating sulfuric acid is interrupted, whether the vacuum tank has lost the vacuum degree, and so on. Improve the efficiency of liquid chlorine packaging and filling cylinders and system production load, and prevent chlorine gas from leaking into the air to pollute the environment and cause poisoning accidents.