How does the sealing auxiliary system maintain stability?

How does the sealing auxiliary system maintain stability?

The stability of the sealing auxiliary system is crucial for ensuring sealing effectiveness, extending equipment life, and ensuring the safe and stable operation of the entire process. The following are various methods to maintain the stability of the sealing auxiliary system:

1、 Reasonable system design

Component selection and matching

Performance parameters of key components: When designing a sealing auxiliary system, appropriate components should be selected based on actual sealing requirements and operating conditions. For example, for a sealed flushing system, the selected flushing pump should have appropriate flow rate and head to ensure that sufficient flushing fluid can be provided to remove heat and impurities from the sealing surface. The flow rate of the flushing pump is generally determined based on the size and speed of the seal, as well as the properties of the sealed medium. It is usually necessary to ensure that the flow rate of the flushing liquid is within a certain range (such as for mechanical seals, the flow rate of the flushing liquid on the sealing surface is generally 2-3m/s) in order to effectively achieve the flushing function.

Compatibility between components: All components in the system must be compatible with each other. For example, the filter in the sealing auxiliary system should match the properties of the flushing or isolation fluid used. If dealing with media containing corrosive chemicals, the material of the filter should have good corrosion resistance, and the filtration accuracy should be able to effectively remove particle impurities that may damage the seal. At the same time, the pressure resistance of the filter should also meet the pressure requirements of the system to avoid problems such as rupture or leakage under high pressure conditions.

System layout optimization

Pipeline layout: The pipeline of the sealing auxiliary system should be arranged reasonably, minimizing the length of the pipeline and the number of bends as much as possible. A shorter pipeline length can reduce pressure loss, allowing flushing or isolation fluids to flow more smoothly. Reducing the number of bends can avoid vortices and local pressure changes caused by changes in fluid direction, and prevent the occurrence of air pockets. For example, when designing sealed auxiliary pipelines for chemical equipment, a linear layout should be adopted. For necessary elbows, a suitable curvature radius should be selected. Generally, the curvature radius of elbows should not be less than three times the diameter of the pipeline.

Equipment location arrangement: The location of equipment in the system (such as pumps, tanks, heat exchangers, etc.) should be easy to operate and maintain. For example, place the sealing liquid tank in a location that is convenient for adding and checking the liquid level, while considering the impact of gravity on the fluid flow in the system. If the position of the sealing liquid tank is too low, it may lead to insufficient supply of sealing liquid, affecting the stability of the system; If the position is too high, it may increase the static pressure of the system and exert excessive pressure on the seals.

2、 Accurate parameter control

pressure control 

Pressure regulating device: The sealing auxiliary system should be equipped with precise pressure regulating devices, such as pressure regulating valves. Real time monitoring of pressure within the system is achieved through pressure sensors. When the pressure deviates from the set value, the pressure regulating valve can automatically adjust its opening to restore the pressure to the normal range. For example, in the sealing auxiliary system of a high-pressure reactor, a pressure regulating valve can control the pressure inside the sealing chamber within a range of ± 0.1MPa, ensuring that the sealing components work in a suitable pressure environment and preventing damage to the sealing components due to high pressure or medium leakage due to low pressure.

Pressure alarm system: Set up a pressure alarm system that can promptly issue an alarm when the pressure exceeds the safe range (fluctuates above or below 20% of the set value). Alarm can be notified to operators through sound and light signals, and the system can automatically take some emergency measures, such as closing relevant valves or stopping the operation of some equipment, to avoid serious damage to the system caused by pressure loss of control.

temperature control

Temperature regulation measures: For some sealing auxiliary systems that require temperature control, such as using heat exchangers to regulate the temperature of the sealing fluid. By monitoring the temperature of the sealing liquid through a temperature sensor and adjusting the flow rate of the cooling or heating medium in the heat exchanger based on the difference between the actual temperature and the set temperature, precise temperature control can be achieved. For example, in the sealing auxiliary system of certain high-temperature sterilization equipment in the food processing industry, the heat exchanger can control the temperature of the sealing liquid within a range of ± 5 ℃, ensuring that the sealing components work in a suitable temperature environment and preventing the sealing liquid from deteriorating or the sealing components from aging due to high temperature.

Temperature protection mechanism: In addition to normal temperature regulation, a temperature protection mechanism should also be set up. When the temperature sensor malfunctions or the temperature regulation system fails, causing an abnormal increase in temperature, the protection mechanism can promptly cut off the heating source or activate emergency cooling measures to prevent the system from being damaged due to high temperature.

3、 High quality maintenance and upkeep

Regular inspection and replacement of components

Determination of inspection cycle: Develop a reasonable inspection cycle based on factors such as the importance of the sealing auxiliary system, working environment, and operating time. For systems operating in harsh environments such as high corrosiveness and high dust, the inspection cycle should be relatively short. For example, in the sealing auxiliary system of mining equipment, due to the high dust and corrosive working environment, it may be necessary to conduct a simple visual inspection once a week and a comprehensive system inspection once a month, including checking the corrosion of pipelines, the degree of filter blockage, etc.

Component replacement standards: Clearly define the replacement standards for components, and replace them promptly when they reach a certain level of wear, service life, or show signs of failure. For example, the sealing gasket in the sealing auxiliary system should be replaced immediately if aging, deformation, or damage is found to occur to avoid leakage. For filters, when the filtering resistance reaches the specified value (such as exceeding 1.5 times the initial resistance), the filter element should be replaced.

Cleaning and lubrication work

System cleaning: Regularly clean the sealing auxiliary system to remove dirt, impurities, and sediment from the pipeline. A combination of chemical and physical cleaning methods can be used. For example, for pipelines containing oil stains, specialized oil cleaning agents can be used for soaking and flushing, followed by physical flushing with high-pressure water to ensure the cleanliness of the interior of the pipeline. Cleaning work can not only prevent impurities from affecting the system, but also improve the heat transfer efficiency and fluid fluidity of the system.

Lubrication maintenance: For equipment with moving parts in the system (such as pumps, valves, etc.), regular lubrication should be carried out. Choose the appropriate lubricant and determine the type and filling cycle of the lubricant based on factors such as the operating temperature, speed, and load of the equipment. For example, for high-speed rotating pump shafts, lubricants with good wear resistance and high temperature resistance should be selected, and lubricant should be added every 1000-2000 hours according to the running time of the pump to ensure that the moving parts of the equipment can run smoothly and maintain the stability of the system.