We offer our audit services at very reasonable rates and even offer rebates that can potentially make our audits free. Check air supply for clean dry, oil-free air. Is the cleaning mechanism adjusted to the proper settings? Your thoughts? Can you provide us with a better description of your process and the baghouse specs? I have also check duck work for build up none was found clean and dirty side. What could cause this? Repair seal or joints if leaking. In turn this will identify the failed valve or solenoid assembly. It gets affected drastically. If correct, the lower pressures indicate that your fan is not pulling as hard since the clean side vacuum is much lower. It sounds like you are getting leaking through your baghouse on a rotary dryer. Hi This is issue I am facing since I have started my plant. Are there any obstructions in the Ductwork System? as you stated that after the clean out the problem stops then use that as you ideal pressure and keep the system there. If the air is coming it so fast that its tearing up the bags then it probably is a result of poor design from the system OEM or modifications have been made to the system by non-baghouse engineer or to the operation (all three are very common in the field). If you have bridging over the hopper discharge you may need to look at the discharge device. I have check rotation on blower motor and also to make sure the dampner is working there and blades are not sticking / stopping air flow. Once we know more we can help you with the problem. If the DP is still high even with new filters its possible the baghouse is undersized. I am having a slight problem with one of my pulse jet type baghouses. If you replaced the bags and its still leaking you need to do a dye leak test to see where the leaks are coming through. Phone: (702) 848-3990. Are the different compartmental Isolation Dampener valves functioning properly? Maintain 80 to 90 psi in header. Are the cleaning pulses at set to the correct duration (0.1 .015 sec)? The system fan is pulling air out of the baghouse at the outlet so it should be negative or worst case close to neutral if the bags are 100% blocked (which is not realistically possible). What do you think I will do my best to relay information. Is the system purged properly after each shutdown? If the product comes out of the Baghouse hopper at a temp higher than the dew point temp then condensation will occur. I do not see any fluctuations when its in use. With regards to fan specific problems its best to check with the fan OEM for their assistance. Can this be my problem? When it blocks up it is mostly at back fills on the entry of the oxide in the bag house any ideas will be welcomed thanks Michael. Your email address will not be published. Do I understand you right, do you not pulse your bags at all? DP get raised from 70 to 100 before surge out and reduced to 70 after surge out. I work in a cement plant where a baghouse is used at the exit of a cement mill. Note:conveyors are covered. 115 diameter x 3 meter long It sounds like you need a faster discharge, we supply fast dumping rotary valves that might help. Required fields are marked *. per temperature or with distance? See here for more information or give us a call or email. It sounds like you are having problems with the collection system not being able to keep up with the dust generated. It could be a number of different things. First, you need to maintain the temp above the dew point as it goes through the baghouse. Thanks for contacting us. Off line isolationa valve also OK.. Let me know if I understand you correctlyWhen you pulse the bags offline they drop huge amounts of dust into the baghouse hopper and this then clogs up the discharge? If increased, how much?? If its settling in the bottom of the duct and building up you could have an issue with product dropout from a air speed within the duct (dropping below the minimum conveying velocity). We have noticed that the issue started after that we have changed the top section of the baghouse plenum (due to corrosion issue). I think you need to take those measurements again. It could be the airlock is fine, but the material is bridging over the discharge. Ok I have a better picture now of whats happening. We had a faux pas in hopper clearing frequency briefly and I had to change a row of bags that had their bottoms abraded. The dust is not emptying from the hopper faster enough during peak loads. If there is another wrong with it you may want to look into getting a better airlock with a faster discharge rate. Is the dust not able to be removed from the Filter Bags by the cleaning mechanism? any ideas? This dust being collected is dumped on to the conveyor at high velocity (By Gravity) resulting in spills across the conveyor. if you are going to enclosure the conveyors then you need to provide sufficient dust collection suction to ventilate the entire run. You are still maintaining the 4 DP, but your vacuum has gone down, correct? When ash is filling the hopper to this level the velocity is increasing, trajectory changing, and hitting the bottom of the bags causing holes. Is the manifold pressure within the manufacturers suggested range? 
What could be causing my drum to steam and at my discharge chute? Air pulsing working with 6bar pressure. Alternatively, you could try installingPTFE membrane filters, which do not require precoating. This issue did not happen until 15 years ago from what I have heard but it had gotten so bad. If you would like to discuss this more in depth you can email me directly at info@baghouse.com, or give us a call tomorrow at (702) 848-3990. Is your dust collector showing signs of trouble ahead? Can you tell me more about the kind of dust you have and how long this problem has been going on for? Baghouse.com is a leading manufacturer of baghouse dust collection systems and equipment with 40+ years of experience serving all industries. The blow pipes could be misaligned, insufficient airflow in the header, wrong settings on the timer board, etc. Check timer indicator lights to see if it is functioning properly and pulsing the valves. I have recently switched from methane to natural gas. Tell me what can do so that ash content come out through dust collector. It is disastrous as the inlet duct becomes smaller, velocity increases and the bottoms of the bags get sand / ash blasted through. We have checked the pulse jet air jet pressure and it is on spec Plz help. Even taking them out and blowing them down with compressed air will not do the trick. Is the opening for the Screw Conveyor (Or similar device) of adequate size? before sending our vapors to ejector system we have a bag filter to remove particles of the drying material as the particle size of material is very less. Mandy What can be the cause and what to do. With low temps on baghouse we are not getting the moisture out. (they should have some as the cake is what does the filtering but it also is what cuts the draw. The past few weeks the system has been loosing suction at all locations the farthest point even more so. Are there any cold spots where pipes or other components connect? Otherwise you need to run ducting to the lines and then have it go to a large central collector. While the proceeding information applies to all Baghouse designs, the following covers specific design related problems. Perform colored fluorescent die test to identify, if possible. Also please confirm the ON time you have for the pulses. Check hopper discharge and 55 gal drum lid for leaks allowing re-entrainment of dust. Actually we are having total 8 same type of bag house system but facing this problem in particular 1 syatem so undersize is not an issue i think. Purging Air pressure 6 bar Thanks for your comment. I dont see how you would have positive pressure on the clean side, regardless of whether the filters are dirty or not. What kind of baghouse is it? #2 Condensation comes from temperature differences in the system. Can you suggest me by using your bag filter(PTFE fabric) can this problem be solved. I think nithi means the induced draft fan. If you are still having problems you can consider having us come out to inspect your system. From yours as an operator/manager in the plant, most label them according to what they are collecting, Clinker cooler baghouse or Hammer mill #5 baghouse, etc. But Im still getting moisture. Check the cleaning system and make sure its operating correctly. Has the Baghouse been sufficiently preheated (Certain applications only)? In the past, the can would fill first. That might be your best solution. This is not due to seasoning of the filters as the vacuum after the filters has been reduced. Hi Check differential pressure lines (tubing) for plug or breaks allowing faulty readings. more acidic gases, higher alkali content, etc.). This is especially common on larger baghouses or when inexperienced laborers do the changeout as they could easily install a few bags incorrectly if they are not being supervised properly. Your article explained common hopper issues in a clear way, so I appreciate you discussing this info. If not, that would be the first step. When in use, the rise in differential pressure is fine and the pulse down occurs when required as expected, and it falls to the expected d/p. close dampers on equipment not effected and open up ones that are. We have a problem with our dynaclone (Baghouse) Coal dust is escaping from the inspection doors. #1 What are APU lines? Also, how sure are you of your temp readings on the kiln? Attempt to dry the tubes by circulating clean warm air through the collector and going through several cleaning cycles. Thanks for the help. 272 bags per module with an average flue gas flow of 17,000cfm. You should also try having a rotary airlock to make sure the dust is emptying at all times and does not have a chance to buildup. You may need to sufficiently precoat the bags or switch to a media with ePTFE membrane or a similar high efficiency media. Try switching to PTFE membrane coating. Most fall within 3,500 to 4,500 ft/sec. You can read our articles about DP troubleshooting here:Baghouse Differential Pressure How to Troubleshoot False Readings. In general, we say that every 1,000 ft of duct will add about 1 of resistance to your system. what could be the problem, Your email address will not be published. It sounds like normal cleaning, online or off, isnt knocking off enough dust.? DEARS, If Nanofiber cartridges are exposed to high moisture, water or liquids of any kind they may need to be replaced. If that happens the pressure on the dirty side of the baghouse might rise higher than normal and you would get some leaks around the hatches. I did mean to say check the airlock but anyways. Is the Baghouse the undersized for the application? Can you tell me a little more about the system? Our bag filter house is not discharging dust continuously. the dust are captured on the bags but when the jet pulse happen, the bag cleanning doesnt happen It could be that the pellets are throwing an increased/decreased dust load on the filters and your cleaning settings are no longer optimal for that mix. IF the dust is passing THROUGH the filters then you likely have massive leaks or you have too small of a baghouse to handle the amount of gas you are trying to pass through it. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Get notifications when we post new content. Learn how your comment data is processed. I have several areas in the plants and each area has around 40,000 am3/h of air flow rate to collect dust. (If your Blower output is normal) Has the Ductwork System been inspected for obstructions, leaks or design flaws that increase static resistance? Does Shaking action take place, as it should? If ductwork then the product being transferred is too wet at too low of a temperature to start with. Removing dust from the hopper quickly is essential for proper operation of your system. Im not too sure whats causing the problem. Has the local weather been unusually rainy/snowy or above/below average recently? You may also need to look at things like hopper vibrators to break up the dust. Most are between 3:1 6:1. Wondering where and how the dust flows through those 2 bags? Rotary step is not a standard term so Im not sure what you are referring to. If the bags were damaged by not precoating them, then you will need to get a new set of filters. check and monitor your gauges to see what the pressure is doing. Any help would be much appreciated. Since starting in September, I have not cleaned the short steel sensing lines. (pulse jet bag house) Save my name, email, and website in this browser for the next time I comment. Dear Sir We have a high D.P pressure even at low loads any ideals? Fabric Details: In our phosphate mine,there is spillage case in the discharge line of dust collector,Spills occur although all rock phosphate spill on the conveyor, spills to outside occur because this phosphate particles are very fine particles and can be suspended in the air. You could also have extra fine dust and if you use normal medias without precoating you can see dust bleed through even on new bags. What exactly do you mean when you say tripping ID fan? The most common variations in Baghouse design regard the cleaning mechanism. Check the airlock and make sure its operating correctly. I am a little confused about whether you are referring to the baghouse or the kettle itself. Insulation helps this problem however it sounds like something else has changed. Plant Manager If you are using a fan that blows back into the unit this is actually a reverse air dust collector. No matter if its 50% up or 100% doesnt seam to slow or help with steaming. In remaining 7 and in this particular bag filter system,everything is same e.g. Is cleaning interval at the lowest setting the will allow air manifold pressure to rebuild? Ive gone up on my baghouse temp 430F. The middle module / hopper on train 3 repeatedly plugs up right after clearing. Please help with any suggestions thanks, I would suggest you look into them again. We have 8 bag filter system but in a particular system facing problem of High DP from last 6 months. When we started operations we were within the 4DP and static pressures for dirty and clean sides have generally been -23 & -27 at the start. You might also need to adjust your cleaning settings. Faulty air systems will coat the filter on the inside and blind the filter causing high-pressure drop and premature replacement. Fabric material is PAN. If the dust is exceptionally difficult to remove you may need to look at redesigning the unit/hopper to have a larger opening or to remove the trough hopper style for a pyramid hopper with a very large discharge. You can try to reduce the moisture content in the processas its really not good practice to send any moisture into your baghouse if you can avoid it. 3. Any changes to the equipment, conveyors, transfer points? You must continually clean the static lines to avoid false readings. Are you getting a reading of positive pressure on your magnehelic gauge or is the air rushing out when you open the hatch? Hello, if not then likely you have developed a air leak (ducts have worn out, rotory valve is leaking air (check the paddles for seal I have solved more problems with my bag houses by servicing the airlock then I care to remember. Sounds like you are feeding the wet corn product right back into the system along with the moisture. Thanks for sending us the question! Is your Blower (System Fan) powering on and operating properly? Required fields are marked *. A combination of 12 and 16 bags seems to work pretty well. The oxide builds up over the middle screw which then trips the bad house.we have tried a vibrator on the out side of the bag house and a bigger star valve non which as worked. IT could very well be the problem. When that trips the suction is gone and a lot of dust drops. City Carting & Recycling. If you are having discharge problems it could indicate a leak around the airlock, high dust loading (too high for the size baghouse indicating high air to cloth ratio, can/interstitial velocity, etc.) When the baghouse is not in use though, the d/p rises and lowers by a full inch every minute or so, maybe even more often. Tunning guy should be here in two weeks to check tunning of the burner. We are trying to run Fuel Pellets instead of coal in a Stoker Boiler and the filters are blinding over and creating problems in the bag house. The fabric filter length is 1.7 metres with 3-5bar of pressure(pulse jet) used to clean the bag..if we increase the bag length to 3meters.. Would the pulse jet air used to clean the bag will be same or need to be increased? In a pulse jet you might have weak or uneven pressure. Thats what we are thinking for some reason that dust system cant handle the amount of dust. Pulse jets are designed to work online, there is not really any reason you should only trigger them when the unit is offline. We havent added or took away from this setup in 3 years. The also has the effect of improving efficiency and service life on the filters in the baghouse since they then only handle the fines as opposed to all the coarse particles and the fines. I have sucked all bag out and cleaned them. The fan should still pull the same Static Pressure [clean side/high number] unless you turned it down somehow. Dear sir, A solenoid valve may be stuck open or a diaphragm may be ruptured. Kindly help me to solve this doubt.. What could be causing this to happen repeatedly in this module? Product has historically always been damp but this is dripping wet water/flour/dust sludge that cakes lines solid ino some sweeps. With all the problems listed something has definitely changed. As soon as he opens open the vacuum breaker, the DP becomes zero and then starts increasing as soon as the deashing starts. Thanks. Hi, we are having a bag filter dust collector system in Ash handling plant of coal fired thermal power station. Weve got some baghouse troubles and Im looking for some ideas. 
Some dust collectors are made specifically for being installed on the conveyor lines and then dump directly back onto the conveyor when the filters are cleaned. After replacing bags and vacuuming the clean side, the DP is still achievable but static pressures of -15 & -19. We have a quite large dust system sucking off the scale and 3 of our legs. Many times you can install vibrators on the hopper walls to help with this problem. Purging air pressure 6.5 bar and purging timing is 7:2 seconds Off:On respectivly. I was steadly able to run 350 to 380 tph all summer no problem now hardly able to run 225 to 250 tph . BH has started to condensate and plug apu lines problems daily. 
are in the correct setting. Open top doors and identify which blow pipe the air is flowing from. Is the dryer removing the same amount of moisture as before the problems started? Replace fuse or timer. Although filterhouse is insulated along with trunk lines,from discharge conveyor and airlock on it is not. | Dominick DalSanto is an Author & Environmental Technologies Expert, specializing in Dust Collection Systems. If the duct is being closed off by build up of dust you have a different issue. How do you monitor emissions levels? When you are looking at design and maintenance, we talk about them in terms of CFM, number of bags, style of baghouse (pulse-jet, reverse-air) type of bags (aramid bags, top load, bottom load, etc.). Purging sequence,purging air pressure,bag size etc.
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