Plate frame pressure filter is a sewage treatment system for sludge treatment equipment, its role is to filter the sludge after sewage treatment, forming a large filter cake (mud cake), in order to eliminate.
Plate and frame filter press consists of five parts: filter press, filter press, hydraulic system, filter press frame, filter plate transmission system and electrical system. The working principle of the plate and frame filter press is relatively simple. The hydraulic pressure is applied to compress the plate and frame group, and the precipitated sludge enters from the middle and distributes between the filter cloth.
As the plate and frame press tight, the mud can't spill out. Under the high pressure of the screw pump and the diaphragm pump, the water in the silt is exuded from the filter cloth and flows into the backwater pipe, and the mud cake is left in the cavity. After that, the plate and frame are released from the pressure, the filter plate is pulled up, the mud cake is driven down by gravity, and the car is pulled away. Therefore, the pressure filtration process is the last working procedure in the sewage treatment process. The main parameters and data of the plate frame filter press are: the number of plate frames is 125, can be expanded to 150 blocks (149 septum), the size of the plate is 1300 * 1300mm, the mud cake is 30mm, the filter area is 297.6, the filter pressure is 16bar, and the maximum closing pressure is 368bar.
The plate frame pressure filter press pressure 368bar, filter pressure 16bar, in the operation of the plate and frame continuous pressure, the water from the mud medium exudation flow, because of the large pressure, plate itself and filter cloth easily damaged or clogged. In addition, due to contamination of oily sludge, transportation systems often get stuck or walk unsteadily.
1. The damage of the plate itself. The cause of the damage of the plate itself is:
1, when the sludge is too thick or dry blocks left, it will cause the clogging of the feeding mouth. At this time, there is no medium between the filter plate and only the pressure of the hydraulic system itself. At this time, the plate itself is easily damaged because of the long compression.
2, insufficient supply or improper solid particles in the feed will also cause too much stress on the frame itself.
3, if the outflow port is blocked or activated by solid, the feeding valve or the outlet valve is closed, and the pressure is nowhere to leak, resulting in damage.
4, when the filter plate is not clean, sometimes it causes the leakage of the medium, once the leakage, the edge of the plate frame will be washed out a small ditch, the mass of media leakage causes pressure can not rise, mud cake can not form.
The method of eliminating the fault:
1. Use nylon cleaning scraper to remove mud from feed port.
2. Complete this cycle and reduce the volume of filter plate
3, check the filter cloth, clean the drain, check the outlet, open the corresponding valve, release the pressure.
4. Carefully clean up the filter plate and repair the filter plate
The repair technique of the filter plate is as follows:
After several years of use, the filter plate has washed some grooves on the edges and corners for some reason. Once the groove marks appear, it will expand rapidly until it affects the formation of filter cake. At first, the cake became soft and then turned into semi solid. Finally, the cake could not be formed. Because the filter plate material is special, it is difficult to repair, and can only be renewed, resulting in high cost of spare parts. During this period, we tried some repair agents, but the effect was not good. When the oil surface repair agent was recently changed, the situation finally appeared, and the effect was very good and the sealing effect was reached. The specific repair methods are as follows:
Repair steps:
1, clean up the trench, leak out fresh surface, can be cleaned with small saws.
2, black and white two kinds of repair agents are allocated according to the ratio of 1:1.
3. Apply the repaired patch to the trench and coat it slightly higher.
4, quickly set up filter cloth, squeeze the filter plate together, make the patch and filter cloth stick together, and squeeze the groove at the same time.
5, after extruding for a period of time, the viscose will form naturally, and no longer will change. At this point, it can be used normally.
Two. The main causes of seepage between frames are water seepage between frames.
1. Low hydraulic pressure
2. There are holes in the folds and filter cloth of the filter cloth
3. The sealed surface has a lump.
The treatment of water seepage between the plates and frames is simple. As long as the hydraulic pressure is added, the filter cloth is replaced, or the nylon scraper is used to clear the block of the sealed surface.
Three. Inhomogeneous filter cake or filter cake
There are many reasons that cause cake formation to be inhomogeneous or uneven. Insufficient or too little supply or blockage will cause this phenomenon. In view of these failures, we need to carefully investigate the causes, and finally find the exact problems, then solve the problem by symptomatic treatment. The main solutions are: increasing feed, adjusting process, improving feed, cleaning filter cloth or replacing filter cloth, cleaning up clogging place, cleaning feed hole, cleaning drainage hole, cleaning or replacing filter cloth, increasing pressure or pump power, low pressure starting, continuous pressurization and so on.
Four, the filter plate is slow or easy to fall. Sometimes, too much oil stains and stains on the guide bar will cause the filter plate to walk slowly and even fall off. At this time, we must clean up the guide bar in time and apply butter to ensure its lubricity. It is important to notice that the oil is strictly prohibited on the guide bar, because the thin oil is easy to fall down and the lower side is very slippery.
Five. The failure of the hydraulic system.
The hydraulic system of the plate and frame filter press mainly provides pressure. When the oil cavity A increases the oil injection, the piston moves to the left and oppresses the filter plate to seal it. When the oil chamber B increases oil injection, the piston moves to the right and the filter plate is released. Due to the precision of manufacturing and the fewer failures of hydraulic system, we must pay attention to routine maintenance. Nevertheless, due to wear, there will be oil leakage every year or so, and then the O ring should be repaired and replaced.
Common hydraulic failures are also unsuitable for pressure keeping and hydraulic cylinder propulsion. The cause of the failure to maintain the pressure
Plate and frame filter press consists of five parts: filter press, filter press, hydraulic system, filter press frame, filter plate transmission system and electrical system. The working principle of the plate and frame filter press is relatively simple. The hydraulic pressure is applied to compress the plate and frame group, and the precipitated sludge enters from the middle and distributes between the filter cloth.
As the plate and frame press tight, the mud can't spill out. Under the high pressure of the screw pump and the diaphragm pump, the water in the silt is exuded from the filter cloth and flows into the backwater pipe, and the mud cake is left in the cavity. After that, the plate and frame are released from the pressure, the filter plate is pulled up, the mud cake is driven down by gravity, and the car is pulled away. Therefore, the pressure filtration process is the last working procedure in the sewage treatment process. The main parameters and data of the plate frame filter press are: the number of plate frames is 125, can be expanded to 150 blocks (149 septum), the size of the plate is 1300 * 1300mm, the mud cake is 30mm, the filter area is 297.6, the filter pressure is 16bar, and the maximum closing pressure is 368bar.
The plate frame pressure filter press pressure 368bar, filter pressure 16bar, in the operation of the plate and frame continuous pressure, the water from the mud medium exudation flow, because of the large pressure, plate itself and filter cloth easily damaged or clogged. In addition, due to contamination of oily sludge, transportation systems often get stuck or walk unsteadily.
1. The damage of the plate itself. The cause of the damage of the plate itself is:
1, when the sludge is too thick or dry blocks left, it will cause the clogging of the feeding mouth. At this time, there is no medium between the filter plate and only the pressure of the hydraulic system itself. At this time, the plate itself is easily damaged because of the long compression.
2, insufficient supply or improper solid particles in the feed will also cause too much stress on the frame itself.
3, if the outflow port is blocked or activated by solid, the feeding valve or the outlet valve is closed, and the pressure is nowhere to leak, resulting in damage.
4, when the filter plate is not clean, sometimes it causes the leakage of the medium, once the leakage, the edge of the plate frame will be washed out a small ditch, the mass of media leakage causes pressure can not rise, mud cake can not form.
The method of eliminating the fault:
1. Use nylon cleaning scraper to remove mud from feed port.
2. Complete this cycle and reduce the volume of filter plate
3, check the filter cloth, clean the drain, check the outlet, open the corresponding valve, release the pressure.
4. Carefully clean up the filter plate and repair the filter plate
The repair technique of the filter plate is as follows:
After several years of use, the filter plate has washed some grooves on the edges and corners for some reason. Once the groove marks appear, it will expand rapidly until it affects the formation of filter cake. At first, the cake became soft and then turned into semi solid. Finally, the cake could not be formed. Because the filter plate material is special, it is difficult to repair, and can only be renewed, resulting in high cost of spare parts. During this period, we tried some repair agents, but the effect was not good. When the oil surface repair agent was recently changed, the situation finally appeared, and the effect was very good and the sealing effect was reached. The specific repair methods are as follows:
Repair steps:
1, clean up the trench, leak out fresh surface, can be cleaned with small saws.
2, black and white two kinds of repair agents are allocated according to the ratio of 1:1.
3. Apply the repaired patch to the trench and coat it slightly higher.
4, quickly set up filter cloth, squeeze the filter plate together, make the patch and filter cloth stick together, and squeeze the groove at the same time.
5, after extruding for a period of time, the viscose will form naturally, and no longer will change. At this point, it can be used normally.
Two. The main causes of seepage between frames are water seepage between frames.
1. Low hydraulic pressure
2. There are holes in the folds and filter cloth of the filter cloth
3. The sealed surface has a lump.
The treatment of water seepage between the plates and frames is simple. As long as the hydraulic pressure is added, the filter cloth is replaced, or the nylon scraper is used to clear the block of the sealed surface.
Three. Inhomogeneous filter cake or filter cake
There are many reasons that cause cake formation to be inhomogeneous or uneven. Insufficient or too little supply or blockage will cause this phenomenon. In view of these failures, we need to carefully investigate the causes, and finally find the exact problems, then solve the problem by symptomatic treatment. The main solutions are: increasing feed, adjusting process, improving feed, cleaning filter cloth or replacing filter cloth, cleaning up clogging place, cleaning feed hole, cleaning drainage hole, cleaning or replacing filter cloth, increasing pressure or pump power, low pressure starting, continuous pressurization and so on.
Four, the filter plate is slow or easy to fall. Sometimes, too much oil stains and stains on the guide bar will cause the filter plate to walk slowly and even fall off. At this time, we must clean up the guide bar in time and apply butter to ensure its lubricity. It is important to notice that the oil is strictly prohibited on the guide bar, because the thin oil is easy to fall down and the lower side is very slippery.
Five. The failure of the hydraulic system.
The hydraulic system of the plate and frame filter press mainly provides pressure. When the oil cavity A increases the oil injection, the piston moves to the left and oppresses the filter plate to seal it. When the oil chamber B increases oil injection, the piston moves to the right and the filter plate is released. Due to the precision of manufacturing and the fewer failures of hydraulic system, we must pay attention to routine maintenance. Nevertheless, due to wear, there will be oil leakage every year or so, and then the O ring should be repaired and replaced.
Common hydraulic failures are also unsuitable for pressure keeping and hydraulic cylinder propulsion. The cause of the failure to maintain the pressure