1、Designation: D 6830 02Standard Test Method forCharacterizing the Pressure Drop and FiltrationPerformance of Cleanable Filter Media1This standard is issued under the fixed designation D 6830; the number immediately following the designation indicates the year oforiginal adoption or, in the case of re
2、vision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method characterizes the operational perfor-mance of cleanable filter media under speci
3、fied laboratoryconditions.1.2 This test method determines the airflow resistance, drag,cleaning requirements, and particulate filtration performance ofpulse cleaned filter media.1.3 This test method determines the comparative perfor-mance of cleanable filter media.1.4 The results obtained from this
4、test method are useful inthe design, construction, and selection of filter media.1.5 The results obtained by this test method should not beused to predict absolute performance of full scale fabric filter(baghouse) facilities, however these results will be useful inselection of proper filter media an
5、d identification of recom-mended operating parameters for these full scale fabric filterfacilities.1.6 The values stated in SI units are to be regarded asstandard. The values in parenthesis are for information only.1.7 This standard does not purport to address all of thesafety concerns, if any, asso
6、ciated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 123 Terminology Relating to TextilesD 461 Test Methods
7、for FeltsD 737 Test Method for Air Permeability of Textile FabricsE 832 Specification for Laboratory Filter PapersF 740 Terminology Relating to Filtration32.2 Other Standards:Draft Generic Verification Protocol for Baghouse FiltrationProducts4Standard Operating Procedures for Verification Testing of
8、Baghouse Filtration Products Using LTG/FEMA TestApparatus, Draft, December5VDI 3926, Part 2 Testing of Filter Media for CleanableFilters under Operational Conditions63. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 fabric conditioning periodthe period during whichthe fabric spe
9、cimen is conditioned within the test apparatus bysubjecting it to 10 000 rapid compressed air cleaning pulses at3-5 seconds between pulses. During the conditioning periodthe specimen is subjected to test method specifications for dustand gas flow rates.3.1.2 fabric recovery periodtime period followi
10、ng theconditioning period during which the fabric is allowed torecover from rapid pulsing. The fabric recovery period requires30 filtration cycles under normal filtration cycles. During therecovery period the fabric is subjected to test method specifi-cations for dust and gas flow rates.3.1.3 filtra
11、tion velocityvolumetric is the flow rate per unitface area. Also referred to as gas-to-cloth ratio (G/C), orair-to-cloth ratio (A/C).3.1.4 filtration cyclea cycle in the filtration process inwhich the particulate matter is allowed to form a dust cake onthe face area of the test specimen with no dist
12、urbances from apulse of compressed air to clean the dust cake from the testspecimen. The filtration cycle is the time period between twoconsecutive cleaning or pulse cycles.3.1.5 filtration cycle timethe duration of time, measuredin seconds or minutes, defined by one filtration cycle. Alsoreferred t
13、o as time between cleaning cycles, or pulse cycles.1This test method is under the jurisdiction of ASTM Committee D22 onSampling and Analysis of Atmospheres and is the direct responsibility of Subcom-mittee D22.03 on Ambient Atmospheres and Source Emissions.Current edition approved October 10, 2002.
14、Published December 2002.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn4Generic Verification Proto
15、col For Baghouse Filtration Products, RTI, ResearchTriangle Park, NC, September 2001.5Test/QA Plan For The Verification Testing of Baghouse Filtration Products,ETS, Inc., October 2000.6Verein Deutscher Ingenieure (VDI 3926, Part 2), 9Testing of Filter Media ForCleanable Filters under Operational Con
16、ditions,9 December, 1994. Availble fromBeuth Verlag GmBH, 10772 Berlin, Germany.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.6 normal filtration cyclea filtration cycle specified forthis test method in which the dust cake is a
17、llowed to form onthe test specimen until a differential pressure of 1000 Pa (4 in.w.g.) is reached. At this point, the test specimen is cleaned bya pulse of compressed air from the clean gas side. After thepulse action is completed the next filtration cycle beginscontinuing until the pressure differ
18、ential reaches 1000 Pa, thusinitiating the next pulse.3.1.7 PM- particulate matteralso used interchangeablywith “dust” when referring to test dust specifications or inletparticulate matter flow rates.3.1.8 PM 2.5particulate matter nominally 2.5 microme-tres and less in equivalent aerodynamic diamete
19、r.3.1.9 performance test perioda 120 minute test periodfollowing the fabric recovery period (360 minutes minimumfor PM 2.5 measurements) during which measurements forparticulate emissions, residual pressure drop, number of filtra-tion cycles, and filtration cycle time are monitored and re-corded. Du
20、ring the performance test period pulse cleaning istriggered at a differential pressure of 1000 Pa (4 in. w.g.)measured across the test specimen. Gas and dust flows aremaintained at test specification flow rates.3.1.10 residual pressure dropthe air flow resistance mea-sured across the test specimen,
21、as measured three seconds aftercleaning the test specimen with a pulse of compressed air,Alsoreferred to as residual differential pressure, P, residual delta P,or dPr,orDpr.3.2 For definitions of other terms used in this test method,refer to Terminologies D 123 and F 740, as well as 11.1 of thistest
22、 method.4. Summary of Test Method4.1 A fabric filter sample is challenged with a standard dust(particulate matter) under simulated baghouse conditions atspecified rates for air and dust flow.4.2 The test consists of three test runs. Each run consists ofthree sequential phases or test periods during
23、which dust andgas flow rates are continuously maintained to test specification.4.2.1 The test phases are:4.2.1.1 A conditioning period consisting of 10 000 rapidpulse filtration cycles to simulate long term operation,4.2.1.2 A30 normal filtration cycle recovery period to allowthe test specimen to re
24、cover from rapid pulsing, and4.2.1.3 A two-hour performance test period, consisting ofnormal filtration cycles, during which measurements for par-ticulate emissions are determined by gravimetric measurementof the particulate matter which passes through the test speci-men.4.3 PM 2.5 emission determin
25、ations can also be conductedby employing a cascade impactor and modifying the clean gasduct of the test apparatus to insure that isokinetic samplingrates through the impactor are maintained.4.3.1 If measuring for PM 2.5 it is advised that the perfor-mance test period be increased from 120 minutes to
26、 at least 360minutes to allow for adequate weight gains on each collectionstage of the impactor.4.4 Initial residual pressure drop, average residual pressuredrop, residual pressure drop increase, number of filtrationcycles, and average filtration cycle time are monitored andrecorded during the perfo
27、rmance test period. Table 1 and Table2 provide test specifications and test conditions respectively.Table 3 provides a listing of results that will be obtained fromthis test.5. Significance and Use5.1 This test method determines the comparative perfor-mance of filter media. The results can be used f
28、or design,manufacturing, construction and selection of filter media.5.2 Results obtained by this test method should not be usedto predict absolute performance on full scale fabric filter(baghouse) facilities, however these results will be useful inselection of proper filter media and identification
29、of recom-mended operating parameters for these full scale fabric filterfacilities.5.3 Dust types vary greatly; therefore, the results obtainedusing the standard dust should not be extrapolated to other dusttypes.6. Interferences6.1 Any variations in the test conditions or test apparatusthat may alte
30、r the physical properties of the dispersed test dustparticles may affect the precision of the test results.6.1.1 These properties include static charge, cohesion, ef-fective particle size, or any other property that affects theability of the dust particles to actually reach the surface of thetest sp
31、ecimen or that affects the interaction between the dustparticles and the filtration surface during the filtration or pulsecleaning process.6.1.2 The test dust is known to have minor differences inparticle size from shipment to shipment and lot number to lotnumber. It is not fully understood what imp
32、act, if any, thesedeviations have on the test results. With each new shipmentand every three months thereafter, the dust particle size shouldbe characterized using the handling, preparation, and testingprocedures specified in this test method. In addition the impactof the dust on differential pressu
33、re and weight gain values of areference fabric should be established and testing of the dustand reference fabric should be conducted quarterly thereafter toallow for comparisons with the established values.6.1.3 Inadequate dispersion of the test dust may affect theprecision of test results. Any surf
34、ace with which the dustcontacts after it leaves the feeder should be made in strictaccordance with the specification. The use of alternate mate-rials for internal surfaces of the raw and clean gas duct maycause the charge on the dust particles to be altered triboelec-trically, which may affect the r
35、esults.6.1.4 The relative humidity and temperature at which thetest is conducted is known to have an effect on the test results.As there are no quantitative relationship that have beenestablished that would allow the correction of test results forvariations in these parameters, it is recommended tha
36、t the testbe conducted in a conditioned room with a relative humiditybetween 40 and 65 % and at a temperature between 23 and27C ( 73.4 to 80.6F). In the absence of a conditioned room,the relative humidity and temperature should be as tightlycontrolled as possible and their levels recorded throughout
37、 thetest.D6830022TABLE1TestSpecificationsConstantParameterNominalValueAcceptableBiasAAcceptablePrecisionBInstrumentFrequencyTestDustParticleSizePercentag(PuralNF)50%2.5m(Avg.3runs)+40%-10%(Avg.3runs)60.0001gFiltermassGainperweighingAndersenImpactor,Model50-900(asDeterminedbyAnalyticalBalance)Quarter
38、lyandEachNewBatchTestDustMassMeanAerodynamicDiameter(PuralNF)1.5m(Avg.3runs)61m(Avg.3runs)60.0001gFiltermassGainperweighingAndersenImpactor,Model50-900(asDeterminedbyAnalyticalBalance)QuarterlyandEachNewBatchFilterSampleDiameter,mm(in.)(Exposeddiameteris140mm,5.51in.)150 (5.88)61.6(116)61.6(116)Filt
39、erCutterEachTestSpecimenInletRawGasFlowrate,m3/h(cfm)5.8(3.4)60.3(0.2)60.01(0.006)MassFlowControllerEachTest.Calibrate6MonthCleanGasFlowrate,m3/h(cfm)1.8(1.10)60.9(0.06)60.01(0.006)MassFlowControllerEachTest.Calibrate6MonthSampleGasFlowrate,m3/h(cfm)1.13(0.67)60.06(0.03)60.01(0.006)MassFlowControlle
40、rEachTest.Calibrate6MonthFiltrationVelocity(G/CRatio)C,m/h(fpm)120 (6.6)66(0.3)61.2(0.07)MassFlowControllerandFilterSampleAreaEachTest.CalibrateEvery6MonthsPressureDropTriggerforCleaning1000Pa(4.0in.w.g)60.127cmw.g(0.05in.w.g)60.127cmw.g(0.05in.w.g)PressureTransducerEachTestRapidPulseCleaningCycles(
41、0-10000),s36161DataloggerClockBeginningofEachTestPulseDuration,ms50.065.061.0PulseRegulatorEachTestPulseCleaningPressure,MPa(psi)0.5(75.0)60.03(5.0)60.007(1.0)PulseRegulatorEachTestGasTemperature,F(C)77(25)64(2)61ThermocoupleEachTestInletDustConcentration,g/dscm(gr/dscf)18.4(8.0)63.6(1.6)60.22(0.1)D
42、ustLoadCellandMassFlowControllerContinuouslyMinimumAggregateMassGainforImpactorSubstrateFilters,g0.000160.00005AndersenImpactor,Model50-900(asDeterminedbyAnalyticalBalance)EachTestChargeNeutralizerPolonium-210AlphaSourceReplaceAnnuallyDustFeederOperation,g/h100620620DustLoadCellEachDustLoadingOperat
43、ionAAcceptablebias=Forthetesttobevalid,theinstrumentreadingmustrecordavaluewithinlistedrange.Forexample,the64degreesaccuracymeansthatthetemperaturereadingofthegasmustbewithintherangeof73to81F.BPrecision=Theprecisionoftheinstrumentreading.Forexample,thethermometerorthermocouplethatisusedtomeasuretemp
44、eraturemustrecordtemperaturewithin1degreeofactual.CFiltrationVelocity(G/C)=CleanGasStreamVolume/ExposedAreaofFilterSample=1.10cfm/0.166ft2=6.6fpm.1.85m3/h/0.01539m2=120m/h.D68300237. Apparatus7.1 General Descriptionthe test apparatus consists of abrush-type dust feeder that disperses dust into a ver
45、ticalrectangular duct (raw gas channel). The dust feed is continu-ously measured and recorded via an electronic scale locatedbeneath the dust feed mechanism. A radioactive Polonium-210alpha source is used to neutralize the dust electrically before itsentry into the raw gas channel. An optical photo
46、sensormonitors the concentration of the inlet dust and ensures that thedust flow is consistent throughout the test.Aportion of the dustladen raw gas flow is extracted from the raw gas channelthrough the test specimen, which is mounted vertically at theentrance to a horizontal duct (clean gas channel
47、). Two vacuumpumps maintain gas flow through the raw gas and clean gaschannels. The flow rates, and thus the filtration velocity (G/C)are kept constant using mass flow controllers. High efficiencyfilters are installed upstream of the flow controllers and pumpsto prevent contamination or damage cause
48、d by the dust. Thetest specimen is cleaned periodically by pulsing with com-pressed air. The cleaning system consists of a compressed airtank, a quick action diaphragm valve, and a blow tube withnozzle facing the downstream side of the test specimen. Thedust that penetrates the test specimen is capt
49、ured on a highefficiency filter. The pressure drop across the test specimen ismeasured and recorded every three seconds throughout the test.Fig. 1 provides a schematic of the test apparatus. The testapparatus consists of the following components.7.1.1 A continuous dust feeding system capable of provid-ing dust feed rates ranging from 80 to 120 grams per hour.7.1.2 A Polonium-210 alpha source for neutralizing the testdusts that have been electrostatically charged by dispersion(dust charge neutralizer).7.1.3 A dust feed hopper with a minimum capacity of 2.0kilogra
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