Process Bag Filters For Cement Plant

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lyna4 Active Contributor Join Date: Dec 2009 Location: algeria Posts: 22	Process Bag Filters For Cement Plant 03/27/2011 2:29 AM
	Hello! I'm working in a cement plant 3000tons/day clinker production.Now we have got two electrical precipitators for dedusting the kiln and the raw mill crushers and we are planning to replace them with new bag filters,getting less than 10 mg/Nm3 dust emission,we are preparing a bid folder asking for proposals from bag filters builders and manufacturers.I'm asking for help from every body who worked or have some experience of such filters,such that we can avoid errors or missing important thinks even so small it can be, may be, it can help a lot in achieving the whole task . Thank you in advance.
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	Pathfinder Tags: Bag Filters cement dedusting cement kiln kiln filters precipitators

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#2 "Re: process bag filters for cement plant" by TonyS on 03/27/2011 6:53 AM (score 2)
#9 "Re: Process Bag Filters For Cement Plant" by pritam on 03/28/2011 4:27 AM (score 2)

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#1 "Re: process bag filters for cement plant" by Tornado on 03/27/2011 3:51 AM (score 1)
#17 "Re: Process Bag Filters For Cement Plant" by Gregorex on 05/04/2011 4:59 AM (score 1)

Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#1 Re: process bag filters for cement plant 03/27/2011 3:51 AM
	I believe you are thinking correctly about this. The key specification is your statement of less than 10mg/Nm³ of downstream emission. Assuming that this level of emission will satisfy the environmental requirements, you should find out from the bag filter supplier how often the filters will need to be replaced or cleaned so that you can maintain your targeted emission level. Of course, this will depend on how much particulate material is in your process stream before it encounters the filters, and how much the filters can absorb before they get clogged. If your supplier is reputable, and if you communicate your needs well, together you can reach a workable system. Good luck with your installation. __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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lyna4 Active Contributor Join Date: Dec 2009 Location: algeria Posts: 22	#4 In reply to #1 Re: process bag filters for cement plant 03/27/2011 11:21 AM
	Thanks Tornado ,for your remarks, You are right the most important parameter to achieve is the less than 50mg of dust per Nm3 of gas. You know all the manufacturers know what they should do in terms of frequency of cleaning, dust density in the gas etc.. But what I need is what we can ask more? or be sure that it will be proposed by these manufacturers while dealing with maintenance,security et.. and how we are going to choose the best filter.If there are recommendations they will be happily received. Thanks a lot
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TonyS Guru Join Date: Aug 2010 Location: Resting under the Major Oak Posts: 4347 Good Answers: 181	#2 Re: process bag filters for cement plant 03/27/2011 6:53 AM
	Normal outlet flow would be Kiln > conditioning tower Conditioning tower + raw mill dust > ID Fan ID Fan > precipitator Precipitator > EP Fan EP Fan > stack Pressure drop across the precipitator is minimal Introduce bag filters and the differential pressure is greater so both the EP & ID fan need upgrading. The outlet of the conditioning tower needs careful monitoring, as moisture will blind the bags, heat will burn the bags out. Timing of the shaking sequence for the bags needs careful consideration, enough time to allow a build up that will drop off but not allow blinding. Best of luck, it will be hell for the first couple of months until you find your feet with the new system. __________________ The reports of my death are greatly exaggerated.
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lyna4 Active Contributor Join Date: Dec 2009 Location: algeria Posts: 22	#3 In reply to #2 Re: process bag filters for cement plant 03/27/2011 11:00 AM
	Hello, Thanks Tonys for your remarks, the conditionning tower will be taken out or modified,no more water injection will be used,we will cool the hot gas by injecting fresh air through a regulating damper to ovoid heat that will burn the bags out..The ID fan will be conserved but we are planning to use a new powerful filter fan. The electro filters will not be used again and they will be replaced by the new bag filters. The shaking sequence will be controlled by the pressure drop between inlet and outlet. Thanks a lot
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kwcharlie Power-User Join Date: Jan 2010 Location: Houston off/on-shore @ Oil Patch Posts: 223 Good Answers: 2	#5 In reply to #2 Re: process bag filters for cement plant 03/27/2011 6:24 PM
	Dam Tony, what all have YOU not worked on? Keep at it lyna4 you are getting some good stuff so far and your response is appreciated. Now I hope this is the last OT here for Lyna. PS Tony, want a 3'rd GA, well you are RETIRED so buck up . __________________ Why do they make manhole covers round? so they won't fall in [before asking "Who is John Galt?"]
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mumuXLS Member Join Date: Mar 2011 Location: Cangzhou,Hebei,China Posts: 8	#6 Re: Process Bag Filters For Cement Plant 03/27/2011 11:12 PM
	Hi! I'm an exporter of dust collector from China,I think you should also ask the gas flow and filtering area,they are very important for a dust collector. In addition, if you want to buy dust collector abroad,you can contact me. __________________ dust collector
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lyna4 Active Contributor Join Date: Dec 2009 Location: algeria Posts: 22	#7 In reply to #6 Re: Process Bag Filters For Cement Plant 03/28/2011 2:05 AM
	Thanks mumuXLS you are right ,the information of the gas flow should be given but the filtering surface area will be calculated by the manufacturer. By the way,would you like to send ,please,some more informations and data about the filters you are selling abroad,thanks.,
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mumuXLS Member Join Date: Mar 2011 Location: Cangzhou,Hebei,China Posts: 8	#8 In reply to #7 Re: Process Bag Filters For Cement Plant 03/28/2011 2:31 AM
	Hello! I have learned that you want to buy filter bag syetem,so I copy one of my products's specifications,as follows. CXS Fiberglass filter bag system Series CXS-X-n Series Item n 4 Item n Gas flow m3/h 30000-40000 50000-60000 Gas flow m3/h 30000-40000 Filtering Area m2/unit 345 345 Filtering Area m2/unit 345 No of unit 4 6 No of unit 4 Total filtering Area m2 1382 2070 Total filtering Area m2 1382 Specifications of Filter bag n Φ0.25×10 Φ0.25×10 Specifications of Filter bag n Φ0.25×10 No of filter bag bar 176 264 No of filter bag bar 176 No of filter bag bar/unit 44 44 No of filter bag bar/unit 44 Filtering wind speed m/nin 0.36-0.48 0.40-0.48 Filtering wind speed m/nin 0.36-0.48 Net Filtering wind speed m/nin 0.48-0.64 0.48-0.58 Net Filtering wind speed m/nin 0.48-0.64 Shape dimension（length×width×height） 9.6×8.2×22.1 14.4×8.2×22.1 Shape dimension（length×width×height） 9.6×8.2×22.1 The total weight (t) 60 70 The total weight (t) 60 Item Series Item Item Item Series Item n n n Gas flow m3/h 30000-40000 Gas flow m3/h 30000-40000 Gas flow m3/h 30000-40000 Gas flow m3/h Filtering Area m2/unit 345 Filtering Area m2/unit 345 Filtering Area m2/unit 345 Filtering Area m2/unit No of unit 4 chamber 8 unit No of unit 4 chamber 8 unit No of unit 4 chamber 8 unit No of unit Total filtering Area m2 2760 Total filtering Area m2 2760 Total filtering Area m2 2760 Total filtering Area m2 Specifications of Filter bag n Φ0.25×10 Specifications of Filter bag n Φ0.25×10 Specifications of Filter bag n Φ0.25×10 Specifications of Filter bag n No of filter bag bar 352 No of filter bag bar 352 No of filter bag bar 352 No of filter bag bar No of filter bag bar/unit 44 No of filter bag bar/unit 44 No of filter bag bar/unit 44 No of filter bag bar/unit Filtering wind speed m/nin 0.42-0.48 Filtering wind speed m/nin 0.42-0.48 Filtering wind speed m/nin 0.42-0.48 Filtering wind speed m/nin Net Filtering wind speed m/nin 0.48-0.55 Net Filtering wind speed m/nin 0.48-0.55 Net Filtering wind speed m/nin 0.48-0.55 Net Filtering wind speed m/nin Shape dimension（length×width×height) 9.6×12.3 ×22.1 Shape dimension（length×width×height） 9.6×12.3 ×22.1 Shape dimension（length×width×height） 9.6×12.3 ×22.1 Shape dimension（length×width×height） The total weight (t) 115 The total weight (t) 115 The total weight (t) 115 The total weight (t) In addition,may I know your company's products,are you an cement plant or other? I hope my message will help you. Joanna Cangzhou Aidi Automation Environmental Protection Equipment Co.,Ltd Website: www.kdflt.com CR4 Admin - email address and phone number removed From the CR4 Rules: Do not post phone numbers or email addresses. The CR4 Admin will delete all phone numbers posted in threads or comments, and we strongly urge you not to put up email addresses. You can share this information via the CR4 internal messaging system. __________________ dust collector
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lyna4 Active Contributor Join Date: Dec 2009 Location: algeria Posts: 22	#10 In reply to #8 Re: Process Bag Filters For Cement Plant 03/28/2011 11:41 AM
	Thanks for your proposal mumuXLS, But the filter you are proposing is too small for the application I'm looking for. THANKS a lot,I'll visit your website
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mumuXLS Member Join Date: Mar 2011 Location: Cangzhou,Hebei,China Posts: 8	#15 In reply to #10 Re: Process Bag Filters For Cement Plant 03/30/2011 4:16 AM
	lyna4, I paste another index of our dust collector for your reference. LDLM 、LDMM、LDMS type LDMM900 Filtering area(m2) 900 No of filter bag(bar) 800 No of team 2×10 Gas flow (m3/h) 135000 Filtering wind speed (m／min) 2.5 No of valve(piece) 40 pressure volume(m3/min) 0.80 weight(T) 42.8 form Single-row Wish my message will help you. __________________ dust collector
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ECOGRACE Participant Join Date: Jan 2026 Posts: 4	#19 In reply to #8 Re: Process Bag Filters For Cement Plant 01/05/2026 12:30 AM
	Hi, Cement plant baghouses are extremely demanding due to high temperatures (often 120–260°C), abrasive clinker dust, and alkaline conditions (pH 10–12). Standard polyester or aramid bags typically degrade within 12–18 months in these environments. Based on industry case studies, PTFE membrane filter bags have become the preferred solution for modern cement kilns and raw mills because: They resist alkali attack (unlike P84 or Nomex) Surface-loading ePTFE design reduces blinding from fine CaO/SiO₂ dust Achieve emissions <10 mg/m³ consistently Service life often exceeds 3 years If you're evaluating options, I’d recommend reviewing technical data on temperature limits, membrane porosity, and scrim material—these greatly impact longevity. We published a short guide on this based on 50+ cement plant installations: https://www.dust-filtration.com/ptfe-filter-bags.html https://www.dust-filtration.com/fiberglass-filter-bags.html Hope this helps! Happy to share test reports or material compatibility charts if useful.
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pritam Guru Join Date: Aug 2008 Location: City of destiny, INDIA Posts: 775 Good Answers: 67	#9 Re: Process Bag Filters For Cement Plant 03/28/2011 4:27 AM
	Lyna, Make a clear process flow chart indicating process fluid flow rate, temperature, pressure and fluid quality at various points, location of filter installation, etc. Decide about fluid quality required after the filter, maximum pressure differential across the filter and filter element life. With these informations contact probable bag filter suppliers requesting them to offer their solutions. Ask them to give details of similar filtration systems supplied by them to their other clients. Study those specifications and make your own tendering specifications with technical and commercial points.
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lyna4 Active Contributor Join Date: Dec 2009 Location: algeria Posts: 22	#11 In reply to #9 Re: Process Bag Filters For Cement Plant 03/28/2011 11:51 AM
	Thank you Pritam, I think that's a very good idea ,that's what I'm trying to do and I hope it will work,one thing that can help also, is ,if I can find some tendering specifications for such a filters already done .
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jerybaciu Associate Join Date: Mar 2011 Location: Toronto, Ont.,Canada Posts: 39 Good Answers: 1	#12 In reply to #11 Re: Process Bag Filters For Cement Plant 03/28/2011 5:02 PM
	If the diagram is that highlighted by TonyS then I think that ID fan has to be upgraded to. The cold air intake is suppose to be before the raw mill if you don't want to modify the oil cooling for mill bearings. As I recall, the flu goes in and out of the mill through the bearings and its temperature it can get as high as 400 deg. C. I do not know how high a concentration of " alkali" you have in your lime. If is high then if the flu temperature is to high before the ID fan, they tend to precipitate on the impeller, the deposits moving the mass of it off center and that causes vibration that mess up its bearings.
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lyna4 Active Contributor Join Date: Dec 2009 Location: algeria Posts: 22	#13 In reply to #12 Re: Process Bag Filters For Cement Plant 03/29/2011 9:07 AM
	hello, jerybaciu, the cold air intake will be ,after the raw mill circuit ,such that we will loose some heat while in contact with the raw material, then this hot gas will meet the fresh air coming from the outside(cold air intake) through a temperature regulated damper.Till this point we do not need to change the ID fan ,but we have to change the EP Fan with a more powerful one ,which must be able to deal with big volume of hot gas. Our raw mills,now are working with this high temperature gas (around 350°C)without any problems, the bearing lubricating oil is water-cooled .If you have more recommendations about kiln bag filters please send it to me. Our lime does not contain Alkali in a proportion where it can be harmful ( you are right). Thanks a lot
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TonyS Guru Join Date: Aug 2010 Location: Resting under the Major Oak Posts: 4347 Good Answers: 181	#14 In reply to #12 Re: Process Bag Filters For Cement Plant 03/30/2011 3:14 AM
	Damn. I forgot about the gas flow through the mill. Age is getting to me __________________ The reports of my death are greatly exaggerated.
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Hi-Vac DSD Participant Join Date: Apr 2011 Posts: 1	#16 Re: Process Bag Filters For Cement Plant 04/07/2011 4:44 PM
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Gregorex Participant Join Date: May 2011 Posts: 1	#17 Re: Process Bag Filters For Cement Plant 05/04/2011 4:59 AM
	Hello Lyna, I'm working for the company specialized in conversion of the existing electrostatic precipitators (ESP) into pulse jet fabric filters (PJFF) as a turn-key project. I believe that this might be a good solution for your cement plant as saves a lot of money through the re-use of the existing ESP casing instead of spending money on the new bag house. Basically we remove the roof of the existing ESP together with all internals and install the filter bags inside of the existing ESP casing- of course the expert opinion is required regarding the need of repair/renovation of the existing ESP foundation, supporting structure, casing etc. Our customers confirm the guaranteed dust concentration after converted ESP into PJFF of below 8 mg/Nm3. In case you still need some help in preparing the mentioned bid folder, please contact me so I can answer all you questions and provide e.g. draft tender specification for the similar project we've done before. CR4 Admin - email address removed From the CR4 Rules: Do not post phone numbers or email addresses. The CR4 Admin will delete all phone numbers posted in threads or comments, and we strongly urge you not to put up email addresses. You can share this information via the CR4 internal messaging system. Good luck with your project!
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lyna4 Active Contributor Join Date: Dec 2009 Location: algeria Posts: 22	#18 In reply to #17 Re: Process Bag Filters For Cement Plant 05/30/2011 6:49 PM
	Hello Gregorex, I'm very happy to discuss and have help from a professional like you,you know the project I'm dealing with now is whole full new kiln bag filters in replacement of the two existing ESP filters (The tender is already in the news paper). But in the next near future we will start the conversion of the two cement ESP filters to bag filters with the re-use of the existing casing ,certainly I'll need your help in preparing draft tender specification for this kind of project,I will try to get your e-mail through CR4 Admin. Thank you very much
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#2 "Re: process bag filters for cement plant" by TonyS on 03/27/2011 6:53 AM (score 2)
#9 "Re: Process Bag Filters For Cement Plant" by pritam on 03/28/2011 4:27 AM (score 2)

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#1 "Re: process bag filters for cement plant" by Tornado on 03/27/2011 3:51 AM (score 1)
#17 "Re: Process Bag Filters For Cement Plant" by Gregorex on 05/04/2011 4:59 AM (score 1)

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Users who posted comments:

ECOGRACE (1); Gregorex (1); Hi-Vac DSD (1); jerybaciu (1); kwcharlie (1); lyna4 (7); mumuXLS (3); pritam (1); TonyS (2); Tornado (1)

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