1、Designation: D 6830 02 (Reapproved 2008)Standard 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,
2、 in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method characterizes the operational perfor-mance of cleanable filter
3、media under specified 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 ob
4、tained from this 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 prope
5、r filter media and 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 conce
6、rns, if any, associated 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
7、461 Test Methods for Felt3D 737 Test Method for Air Permeability of Textile FabricsE 832 Specification for Laboratory Filter PapersF 740 Definitions of Terms Relating to Filtration32.2 Other Standards:Draft Generic Verification Protocol for Baghouse FiltrationProducts4Standard Operating Procedures f
8、or Verification Testing ofBaghouse 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
9、during whichthe fabric specimen 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
10、 periodtime period following 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 g
11、as flow rates.3.1.3 filtration 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
12、test specimen with no disturbances 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 filtra
13、tion cycle. Alsoreferred to as time between cleaning cycles, or pulse cycles.3.1.6 normal filtration cyclea filtration cycle specified forthis test method in which the dust cake is allowed to form on1This test method is under the jurisdiction of ASTM Committee D22 on AirQuality and is the direct res
14、ponsibility of Subcommittee D22.03 on AmbientAtmospheres and Source Emissions.Current edition approved April 1, 2008. Published July 2008. Originallyapproved in 2002. Last previous edition approved in 2002 as D 6830 - 02.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact
15、 ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn.4Generic Verification Protocol For Baghouse Filtration Products, RTI, ResearchTriangle Park, NC, September 2001.5Test/QA Plan For
16、 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 Conditions,9 December, 1994. Availble fromBeuth Verlag GmBH, 10772 Berlin, Germany.1Copyright ASTM Intern
17、ational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.the 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 co
18、mpleted the next filtration cycle beginscontinuing until the pressure differential 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
19、matter nominally 2.5 microme-tres and less in equivalent aerodynamic diameter.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 f
20、iltra-tion cycles, and filtration cycle time are monitored and re-corded. During 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 residu
21、al pressure dropthe air flow resistance mea-sured across the test specimen, 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 tes
22、t method,refer to Terminologies D 123 and F 740, as well as 11.1 of thistest 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 te
23、st runs. Each run consists ofthree sequential phases or test periods during 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
24、 A30 normal filtration cycle recovery period to allowthe test specimen to recover 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
25、 matter which passes through the test speci-men.4.3 PM 2.5 emission determinations 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 i
26、s advised that the perfor-mance test period be increased from 120 minutes to 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,
27、and average filtration cycle time are monitored andrecorded during the performance 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 determ
28、ines the comparative perfor-mance of filter media. The results can be used for 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 r
29、esults will be useful inselection of proper filter media and identification 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. Interfere
30、nces6.1 Any variations in the test conditions or test apparatusthat may alter 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
31、theability of the dust particles to actually reach the surface of thetest specimen 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
32、to shipment and lot number to lotnumber. It is not fully understood what impact, 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 i
33、n this test method. In addition the impactof the dust on differential pressure 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 d
34、ispersion of the test dust may affect theprecision of test results. Any surface 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
35、 the dust particles to be altered triboelec-trically, which may affect the results.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 correct
36、ion of test results forvariations in these parameters, it is recommended that 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 sho
37、uld be as tightlycontrolled as possible and their levels recorded throughout thetest.D 6830 02 (2008)2TABLE1TestSpecificationsConstantParameterNominalValueAcceptableBiasAAcceptablePrecisionBInstrumentFrequencyTestDustParticleSizePercentag(PuralNF)50%2.5m(Avg.3runs)+40%-10%(Avg.3runs)60.0001gFilterma
38、ssGainperweighingAndersenImpactor,Model50-900(asDeterminedbyAnalyticalBalance)QuarterlyandEachNewBatchTestDustMassMeanAerodynamicDiameter(PuralNF)1.5m(Avg.3runs)61m(Avg.3runs)60.0001gFiltermassGainperweighingAndersenImpactor,Model50-900(asDeterminedbyAnalyticalBalance)QuarterlyandEachNewBatchFilterS
39、ampleDiameter,mm(in.)(Exposeddiameteris140mm,5.51in.)150 (5.88)61.6(116)61.6(116)FilterCutterEachTestSpecimenInletRawGasFlowrate,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.Calibra
40、te6MonthSampleGasFlowrate,m3/h(cfm)1.13(0.67)60.06(0.03)60.01(0.006)MassFlowControllerEachTest.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(
41、0.05in.w.g)60.127cmw.g(0.05in.w.g)PressureTransducerEachTestRapidPulseCleaningCycles(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)61Th
42、ermocoupleEachTestInletDustConcentration,g/dscm(gr/dscf)18.4(8.0)63.6(1.6)60.22(0.1)DustLoadCellandMassFlowControllerContinuouslyMinimumAggregateMassGainforImpactorSubstrateFilters,g0.000160.00005AndersenImpactor,Model50-900(asDeterminedbyAnalyticalBalance)EachTestChargeNeutralizerPolonium-210AlphaS
43、ourceReplaceAnnuallyDustFeederOperation,g/h100620620DustLoadCellEachDustLoadingOperationAAcceptablebias=Forthetesttobevalid,theinstrumentreadingmustrecordavaluewithinlistedrange.Forexample,the64degreesaccuracymeansthatthetemperaturereadingofthegasmustbewithintherangeof73to81F.BPrecision=Theprecision
44、oftheinstrumentreading.Forexample,thethermometerorthermocouplethatisusedtomeasuretemperaturemustrecordtemperaturewithin1degreeofactual.CFiltrationVelocity(G/C)=CleanGasStreamVolume/ExposedAreaofFilterSample=1.10cfm/0.166ft2=6.6fpm.1.85m3/h/0.01539m2=120m/h.D 6830 02 (2008)37. Apparatus7.1 General De
45、scriptionthe test apparatus consists of abrush-type dust feeder that disperses dust into a verticalrectangular 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 t
46、o neutralize the dust electrically before itsentry into the raw gas channel. An optical photo 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 tes
47、t specimen, which is mounted vertically at theentrance to a horizontal duct (clean gas channel). 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 ar
48、e installed upstream of the flow controllers and pumpsto prevent contamination or damage caused 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 faci
49、ng the downstream side of the test specimen. Thedust that penetrates the test specimen is captured 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 d
