The tube can be rinsed.
Conclusion In summary, the cerium oxide slurry supply system must meet the process requirements of screen sealing and edge polishing. Operation of equipment and facilities is a successful case. Development of air intake filter system for centrifugal air compressor unit Li Chaolong Liu Yurong Henan Ancai Group Co., Ltd. The influence of poor filtration quality on centrifugal air compressor, focusing on the application of centrifugal air compressor Development principle of machine air intake filtration system Economic characteristics of the process characteristics and use effect.
The centrifugal air compressor has the characteristics of compact structure, light weight, small volume, high running efficiency, large flow rate and few friction parts. It has been widely used in the industrial field in recent years. The total of 13 centrifugal compressors introduced by Ancai Group, with a gas volume of 2560, played an extremely important role in the production of glass bulbs and the rapid development of the company. However, centrifugal air compressors often have rotors due to their small internal clearance of rotor speed. The vibration value is high, the surge temperature and other faults are caused by the poor intake air quality. How to solve the problem of poor intake air quality directly affects the safe and stable operation of the equipment. Ancai Group successfully designed and developed the air filtration system through repeated demonstration and experimentation, which fundamentally solved the air intake quality of the air compressor.
Analysis of the status quo of air filtration equipment 1 Current status of air filtration equipment There are many types of filters applied at home and abroad, mainly including baffle filter bag filter bag filter and self-cleaning filter.
Clean filter.
The imported air compressors we use are equipped with baffle frame filters and pre-filters. They are common types of air inlet filters for centrifugal air compressors. The strength of this type of filter is that the cost of replacement is high. The filter materials produced abroad are all glass fiber filter paper, and the filtration efficiency is 67. However, the filter paper performance of this kind of filter in China is not ideal, not only the efficiency is low, but also the filter area is small, the initial resistance is large, and the dust capacity is small. This results in frequent replacement of the filter element and reduced filtration.
Bag filters have been the most important form of filter in the ventilation field since the 1960s. The vast majority of foreign countries use Boliqi fiber manufacturing, the filter efficiency specification is 5 mesh, the filter material of domestic bag filter is almost all chemical fiber, the filter efficiency specification is 36, and the filtration efficiency is low.
The filter material of the bag filter is a dense and non-breakable nonwoven fiber material. Dozens of times or hundreds of slender bags are placed in the box. After the dusty air enters the box, it is filtered through the filter bag. When the area outside the bag is too much gray, the mechanical rapping or the pulsed airflow backflush causes the dust to fall off. The falling dust is discharged from the bottom of the box. Its filtration efficiency is 0305, which is mainly to filter out large particle dust.
The self-cleaning filter is a plurality of sets of filter cartridges, borrowing the reverse pulse airflow self-junction principle of the bag filter, and replacing the bag with a filter cartridge. The efficiency specification of the self-cleaning filter is 0407, and the efficiency mainly depends on the filter cartridge. Self-cleaning filters are relatively expensive to manufacture.
The above filters only change the ease of replacement from the structure, but the accuracy of the filter is limited due to the quality of the domestic filter material.
2 Inspiratory filter effect is poor. Centrifugal air compressor harms the core part of the centrifuge. The impeller rotor has a single-sided cantilever type. The rotation speed is very high during operation. The center of the disk has a fixed dynamic burning degree along the axis. Instantly, when large particles of impurities enter the impeller and the impeller is subjected to axial impact force, the center of the disc is combined with natural vibration and forced vibration to form a more complex motion. The amplitude at this time is larger than the gap impeller and guide around the impeller. The gap of the flow device is very small, only 0.15.2, the impeller will collide with the deflector, resulting in damage to the rotor bearing and seal.
Many small particles of impurities in the air enter the body, and after a long period of accumulation on the impeller surface, the imbalance caused may cause equipment failure.
The small particle impurities are compressed and flow backward with the air, and adhere to the diffuser wall and the air side of the cooler core, so that the cross-sectional area of ​​the flow channel is reduced, the resistance is increased, and the exhaust temperature of the air compressor is increased, and it is easy to reach. Surging point.
3 Mechanism analysis of poor air intake filtration effect In order to fundamentally solve the problem of intake air quality, we focused on the analysis of the filtration mechanism when designing the filtration system. Most air filter materials are composed of finely arranged fine fibers. The wide space between the fibers allows the airflow to pass smoothly. The dust in the airflow hits the obstacles, the fibers and other dusts that have been captured by the fibers, and the gravitational force on the surface sticks the dust. Obstacle. Any dust can be trapped by obstacles. The possibility is different. The filter device cannot eliminate dust 100%, but it can reduce the dust concentration of the air to the allowable range.
With the relevant information, large particles of dust 0.5! The impact fiber is based on inertia and is called the principle of inertia in filtration theory. The larger the dust, the greater the inertia, the greater the possibility of dust slamming obstacles, the more efficient, the more efficient; the small particle dust 0 hits the fiber by the random movement of the particles. The more intense the irregular movement, the more likely the dust will hit the obstacle and the higher the filtration efficiency.
There is a low efficiency point.
Air over, the system's own design and development In view of the current situation of filters at home and abroad, we consider the filter filtration mechanism comprehensively, the general transformation idea is to invest in the efficiency and ease of use. Retaining the original baffle filter, adding a relatively cheaper bag filter in the front section, extending the life of the baffle filter, adding a bag filter to the front section, increasing the air pressure Machine inlet resistance, for air compressors, will increase the compression ratio and increase power consumption. To this end, a booster fan is designed in the air intake system, and forced air is supplied to increase the inlet pressure of the air compressor to form a forced air inlet filter system as follows.
2 Determination of the process plan The air is filtered into the fan through the non-woven fabric, and after being pressurized, it is distributed into each closed-stage filter room through the total air duct, and the large-particle dust is filtered out by the bag-level filter in the stage filter room. The particle size of 4,1, according to the site conditions, it is determined that the total air duct is arranged under the steel platform of the graded filter room, and the air enters the stage filter room vertically. The cross section of the air flow in the stage filter room is enlarged, the flow rate is reduced, and most of the dust is separated from the air flow. Effectively filter out dust with a diameter of 0.10.5 μm.
The choice of fan parameters is very important. If the fan pressure is too high, it will deviate from the design condition of the compressor, resulting in increased power consumption and reduced efficiency of the equipment. If the fan pressure is too low, the increased filtration will not be overcome. The resistance of the device increases the negative pressure difference of the intake air, which also causes the power consumption of the device to increase.
The medium efficiency bag filter with an efficiency specification of 45 has a final resistance of 24 times the initial resistance, about 4005003, the resistance of the air duct is about 2003, the total resistance is about 6007, and the wind pressure is 10003 when the fan is selected. about.
The total air intake of all air compressors was increased by a factor of 1.21.8 times, and the total air volume was selected as 1600003.
After the implementation of this scheme, the suction port of the compressor is completely closed, and the compressed air is derived from the air supply of the fan. If the fan is stopped, the compressor will be sent to the unloading, which is unfavorable for stable operation. Disperse, set up the turbine, and start the operation.
The fan is powered by dual power supplies, minimizing the risk of downtime due to power outages and voltage fluctuations.
The size of the two doors that are reserved for the filter replacement in each stage of the filter room is increased to open the door when the table fan is fully stopped, and naturally enters the air.
Relationship between filtration efficiency and dust particle size In order to maintain the fan and filter, a partition valve is added at the inlet of the fan outlet and the inlet room.
In order to facilitate the observation of the filter resistance, pressure is applied before and after each layer of the filter.
4Comprehensive economic analysis: Panel filter replacement and economic analysis before and after CD transformation Before the transformation, the number of filter cartridges is replaced every year. The number of filter cartridges per year is about 330,000 yuan per year. There are 6 080 air compressors. In the past year, the filter element was replaced by 12001,500 times, the annual consumption level filter element was about 1000 pieces, and the grade filter element was about 400 pieces. After the transformation, about 200 units of the whole year, about 400 pieces of annual consumption grade filter, 200 pieces of grade filter, and will save 230,000 yuan per year.
2 Analysis of maintenance frequency and maintenance cost of equipment before and after transformation Take 6 080 air compressors as an example. The economic analysis before and after the air filter reform is as follows: The situation before the transformation is 080 air compressor since the operation in 2001 for 3 years, Dynamic balance 10 times, replace 2 sets of rotors, 4 sets of bearings, 4 sets of seals, 4 pieces of cooler core, 5 sets of spindles. The cost of repairing spare parts and labor is 1.845 million yuan, which is equivalent to about 615,000 yuan per year. After the transformation, the equipment basically does not need to be dismantled and maintained.
According to the above, after the transformation, 6 sets of 080 will save about 700,000 yuan than before the transformation. As a result, the investment can be recovered in less than half a year.
Characteristics of the air filtration system 1 The filtering capacity is large. By integrating multiple filters into a set of filtering devices, the processing capacity is 2520, and the rainbow 1 belongs to a large filtering device.
2 Filtration accuracy In the whole filtration system, most of the impurities in the air can be filtered out, and the gravity is settled in several places in the main air duct stage filtering room, thereby avoiding the lowest filtration efficiency of the impurity particles between 0.10.5 and 1.
3 System operation is stable and reliable To ensure the reliability of the stable operation of air compressor equipment, the fan considers the backup equipment and dual power supply; in order to facilitate the inspection, the damper is installed at the entrance of each equipment; the spare port of the equipment can be quickly opened even when the fan is completely stopped. Spare port, naturally enter the wind.
4 The equipment is stable after use, which greatly saves the workload of the maintenance personnel and the replacement frequency of the filter core.
5 Economical good Centrifugal air compressor inlet filter system designed and developed by ourselves. Other types of filters such as self-cleaning filters save about 70,000 yuan compared with the secondary investment; compared with the existing plate frame filter , running maintenance costs saved about 700,000 yuan.
Conclusion The centrifugal air compressor inlet filter system adopts the technology of non-woven fabric pre-filter forced air bag filter and plate and frame filter, which successfully eliminates the shortcomings of the traditional filter device. Whether the filtration efficiency or the filtration accuracy meets the design requirements, it is an effective method to solve the problem of the inlet filtration quality of the imported centrifugal air compressor.
Liu Hong et al. Cai Jie Han Jie Zhang Ruilin and other centrifugal fan ash mechanism discussion Fan technology 20004 gas turbine and centrifugal air compressor air filtration rotating machinery failure mechanism and diagnostic technology Mechanical Industry Press
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