In the software equipment of water ring vacuum pump system, a return valve is installed in the return pipe from the outlet of separation equipment to the inlet of vacuum pump, which is decided according to the actual operation characteristics of the liquid chlorine filling position. The actual operation of liquid chlorine filling is intermittent. The amount of waste chlorine delivered to the software of water ring vacuum pump system changes with the change of liquid chlorine filling amount. The software equipment of vacuum pump system operates continuously. When the waste chlorine discharged by the software of liquid chlorine filling system is reduced or terminated, it is required to open the return valve to fill part of the waste chlorine to the vacuum pump channel, so as to maintain the sulfuric acid circulating system and the heat generated, and ensure the vacuum value of similar vacuum tank is stable.
1. Software steps of water ring vacuum pump negative pumping system
Plan of software steps of water ring vacuum pump system, waste chlorine caused by liquid chlorine packaging (key is composed of chlorine and air) enters into similar vacuum tank, and the water ring vacuum pump uses 98% (WT) sulfuric acid as material to carry out liposuction of circulation system, maintain the vacuum value of similar vacuum tank at 30 ~ 40kpa, and ensure the smooth operation of liquid chlorine filling cylinder. From the water ring vacuum pump, the vapor-liquid compound (the key is composed of chlorine + gas + sulfuric acid) enters the gas-liquid separator to carry out vapor-liquid separation, and the waste chlorine from the separation equipment enters the chlorine gas desulfurization tower. The NaOH water solution with the concentration value of 18% (WT) is used to digest and absorb the chlorine gas, and the non condensable gas (gas) is extracted by the centrifugal fan and discharged. The temperature of sulfuric acid from the separation equipment will rise after it is shrunk by the liquid ring pump, so the calorific value needs to be removed. The sulfuric acid goes through the spiral plate cooler to cool the circulating water in the circulating system, and then enters the vacuum pump inlet. The waste chlorine gas caused by the liquid chlorine packing of the continuous circulating system is recycled. During the packaging of liquid chlorine, the air permeated by waste chlorine contains water. It’s very southern weather. The air has a large amount of water. The water is digested and absorbed by sulfuric acid after contacting with air-fuel ratio and sulfuric acid, resulting in the thinning of sulfuric acid. Therefore, it’s necessary to drain and replace sulfuric acid on time to avoid the corrosion of machinery and equipment. When the concentration of hydrochloric acid drops to 92% (WT), 98% (WT) sulfuric acid needs to be added from the upper tank for replacement.
2. Shortcomings of software equipment in the operation of water ring vacuum pump system
After the self driving fund of the waste chlorine ultrafiltration device is put into operation, because the amount of waste chlorine discharged by the software of the liquid chlorine filling system is unstable, the pressure at the outlet of the vacuum pump fluctuates greatly and often, resulting in that the vacuum value of the imported similar vacuum tank cannot be guaranteed, or even the loss of the vacuum value becomes a positive pressure, which immediately endangers the actual operation of the liquid chlorine filling cylinder of the liquid chlorine filling position, resulting in liquid chlorine Packaging can not be carried out, which endangers the stable production and manufacturing of chlorine system software. When it is relatively serious, chlorine will leak into the air, causing air pollution and poisoning of workers. In addition, due to the low outlet pressure of the pump, the hydrochloric acid cut-off of the circulating system can not remove the heat, the vacuum pump body, centrifugal impeller and mechanical seal are often damaged due to the high temperature and corrosion, the service life is reduced, and the maintenance amount of the vacuum pump and the maintenance cost of the vacuum pump are increased.
According to the analysis, when the software equipment of waste chlorine vacuum pump system works, the hydrochloric acid in the circulating system will be broken, which may lead to the loss of vacuum value and equipment failure. It is found that when the system software is in normal operation, the outlet pressure of vacuum pump, i.e. the pressure of gas-liquid separator, should be maintained at or equal to 0.1MPa. When the pressure is lower than this value, hydrochloric acid is very easy to lose the circulation system and generate a final cut-off condition, while the pipeline to waste chlorine desulfurizer is – 2MPa up and down. In actual operation, the outlet valve of gas-liquid separator should be reduced and the pressure of separation equipment should be increased above 0.1MPa In order to consider that the hydrochloric acid in the circulating system does not produce a final break when the vacuum pump system software operates. Because the actual operation of filling the gas cylinder in the liquid chlorine position is to drain the waste chlorine gas in the gap, the waste chlorine gas sent to the vacuum pump system software also changes with the size of the liquid chlorine filling volume. When the outlet pressure of the waste chlorine vacuum pump decreases, the actual operating personnel should reduce or close the outlet valve to avoid the end of acid in the circulating system caused by the vacuum pump; When the filling capacity of the liquid chlorine position is large, the outlet pressure of the vacuum pump will rise. At this time, the actual operating personnel enlarge the outlet valve to avoid the damage of the pump due to overpressure. The pressure adjustment at the outlet of the vacuum pump is the actual operation of the manual service, which expands the compressive strength of the actual operating staff. Often, due to the difficult problem of harmony between positions and the lack of manual service adjustment, the pressure at the outlet of the vacuum pump fluctuates greatly, similar to the loss of vacuum value of the vacuum tank, and the pump is damaged due to the acid break of the vacuum pump.
3. The treatment of software and equipment problems in water ring vacuum pump system
In order to deal with the problem that the pressure at the outlet of vacuum pump is not adjusted immediately due to the manual service, resulting in the destruction of machinery and equipment caused by hydrochloric acid breaking in the circulation system, endangering the production and manufacturing of system software, environmental pollution caused by chlorine leakage, and safety accidents caused by poisoning of workers. The software of vacuum pump system is updated and transformed in processing technology, as shown in Figure 2. At the outlet of vacuum pump, i.e. the outlet pipe of vapor-liquid separation, an automatic regulating valve is installed in series with the original manual regulating valve, and a remote pressure inspection equipment is installed in the gas-liquid separator. The DCS is used to carry out real-time monitoring and automatic adjustment of the actual operation. The regulating valve can be set to adjust the oil pipe pressure according to the pressure of vapor-liquid separation, and the outlet pressure of the stable vacuum pump is 0.1MPa, when the pressure of the gas-liquid separator When it is less than the preset value (0.1MPa), DCS will cause low pressure to prompt the main control chip operator to inform the on-site operator to check the operation status of the vacuum pump system software, whether the hydrochloric acid of the circulating system is finally broken, and whether the vacuum value of similar vacuum tank is lost, etc. Improve the efficiency of the liquid chlorine packaging filling cylinder and the production and manufacturing load of the system software, so as to avoid the environmental pollution caused by the leakage of chlorine into the air and the safety accidents caused by the poisoning of the staff.
Chlorine solves the problem that the capital is put into operation after upgrading and upgrading the software and equipment of the vacuum packaging system of liquid ring vacuum pump in the process flow. The automatic control valve reflects dexterously. The vacuum value and outlet pressure of the vacuum pump are very stable. The hydrochloric acid in the vacuum pump circulating system rarely causes acid breaking safety accidents, which greatly reduces the repair rate of the vacuum pump and the maintenance volume of the vacuum pump. It not only improves the working efficiency of liquid chlorine packaging, improves the office environment, but also improves the actual operation level of the automation technology of the equipment, reduces the labor efficiency of the staff, and reasonably ensures the safe and stable operation of the equipment.