Duk da yake ka'idodin PFI da ISO suna kama da kamanni ta hanyoyi da yawa, yana da mahimmanci a lura da sau da yawa bambance-bambance masu sauƙi a cikin ƙayyadaddun bayanai da hanyoyin gwajin da aka ambata, kamar yadda PFI da ISO ba koyaushe suke kwatankwacinsu ba.

Kwanan nan, an nemi in kwatanta hanyoyin da ƙayyadaddun bayanai da aka ambata a cikin ma'aunin PFI tare da ma'aunin ISO 17225-2 mai kama da kama.

Ka tuna cewa an haɓaka ka'idodin PFI don masana'antar pellet ɗin itace ta Arewacin Amurka, yayin da a mafi yawan lokuta, sabbin ka'idodin ISO da aka buga sun yi kama da tsoffin ka'idodin EN, waɗanda aka rubuta don kasuwannin Turai. ENplus da CANplus yanzu suna yin la'akari da ƙayyadaddun ƙayyadaddun ƙayyadaddun azuzuwan A1, A2 da B, kamar yadda aka tsara a cikin ISO 17225-2, amma masu kera da farko suna kera "A1".

Hakanan, yayin da ma'aunin PFI ke ba da ma'auni don ƙimar ƙima, daidaitattun ƙima da maki masu amfani, yawancin masu kera suna samar da ƙimar ƙima. Wannan darasi yana kwatanta buƙatun ƙimar ƙimar PFI da darajar ISO 17225-2 A1.

Bayanin PFI yana ba da damar kewayon girma mai yawa daga 40 zuwa 48 fam kowace ƙafa mai siffar sukari, yayin da ISO 17225-2 ke nuni da kewayon kilogiram 600 zuwa 750 (kg) a kowace mita cubic. (37.5 zuwa 46.8 fam a kowace ƙafar cubic). Hanyoyin gwaji sun bambanta ta hanyar yin amfani da kwantena daban-daban, hanyoyi daban-daban na ƙaddamarwa da daban-daban na zub da tsayi. Baya ga waɗannan bambance-bambancen, hanyoyin biyu a zahiri suna da babban matsayi na bambance-bambancen sakamakon gwajin ya dogara da dabarar mutum ɗaya. Duk da waɗannan bambance-bambancen da bambance-bambancen da ke tattare da su, hanyoyin biyu suna da alama suna haifar da sakamako iri ɗaya.

Matsakaicin diamita na PFI shine 0.230 zuwa 0.285 inci (5.84 zuwa 7.24 millimeters (mm)) Wannan yana tare da fahimtar cewa masana'antun Amurka galibi suna amfani da mutuƙar inci ɗaya cikin huɗu kuma wasu ƙananan girman mutu. ISO 17225-2 yana buƙatar masu kera su bayyana 6. ko 8 mm, kowanne tare da juriya ko ragi 1 mm, yana ba da damar yuwuwar kewayon 5 zuwa 9 mm (0.197 zuwa 0.354 inci). ) Girman mutu, ana sa ran masu kera za su bayyana 6 mm Ba a da tabbas game da yadda 8 mm diamita zai shafi aikin murhu.

Don dorewa, hanyar PFI ta bi hanyar tumbler, inda girman ɗakin ya kasance inci 12 da 12 inci ta inci 5.5 (305 mm ta 305 mm ta 140 mm). Hanyar ISO tana amfani da irin wannan tumbler wanda yake ɗan ƙarami kaɗan (300 mm ta 300 mm ta 120 mm). Ban sami bambance-bambance a cikin girman akwatin don haifar da bambanci mai mahimmanci a cikin sakamakon gwaji ba, amma a cikin ka'idar, akwatin da ya fi girma zai iya ba da shawarar gwaji mai tsanani don hanyar PFI.

PFI tana ayyana tara a matsayin kayan da ke wucewa ta allon ragar waya na inci ɗaya na takwas (ramin murabba'in 3.175mm). Don ISO 17225-2, an ayyana tarar azaman kayan da ke wucewa ta allon rami mai zagaye 3.15mm. Duk da cewa girman allo 3.175 da 3.15 suna kama da kamanni, saboda allon PFI yana da ramukan murabba'i kuma allon ISO yana da ramukan zagaye, bambancin girman buɗewa kusan kashi 30 ne. Don haka, gwajin PFI yana rarraba wani yanki mafi girma na kayan azaman tarar da ke sa ya zama da wahala a wuce gwajin tarar PFI, duk da samun daidaitaccen buƙatun tarar da ake buƙata don ISO (dukansu suna yin la'akari da iyakar tarar kashi 0.5 na kayan jaka). Bugu da ƙari, wannan yana haifar da sakamakon gwajin dorewa ya zama kusan 0.7 ƙananan lokacin da aka gwada ta hanyar PFI.

Don abun ciki na toka, PFI da ISO suna amfani da yanayin zafi iri ɗaya don toka, 580 zuwa 600 digiri Celsius don PFI, da 550 C don ISO. Ban ga babban bambanci tsakanin waɗannan yanayin zafi ba, kuma na yi la'akari da waɗannan hanyoyi guda biyu don ba da sakamako kwatankwacin. Iyakar PFI don ash shine kashi 1, kuma iyakar ISO 17225-2 na ash shine kashi 0.7.

Dangane da tsayi, PFI baya barin sama da kashi 1 ya zama tsayi fiye da inci 1.5 (38.1 mm), yayin da ISO ba ta ƙyale sama da kashi ɗaya cikin ɗari ya wuce 40 mm (inci 1.57) kuma babu pellet fiye da 45 mm. Lokacin kwatanta 38.1 mm 40 mm, gwajin PFI ya fi tsauri, duk da haka, ƙayyadaddun ISO cewa babu pellet ɗin da zai iya wuce 45 mm na iya sanya ƙayyadaddun ISO mafi tsauri. Don hanyar gwaji, gwajin PFI ya fi kyau sosai, saboda ana yin gwajin a kan ƙaramin samfurin kilo 2.5 (gram 1,134) yayin da gwajin ISO ɗin ana yin shi akan gram 30 zuwa 40.

PFI da ISO suna amfani da hanyoyin calorimeter don tantance ƙimar dumama, kuma duka gwaje-gwajen da aka ambata suna ba da sakamako kwatankwacin kai tsaye daga kayan aikin. Don ISO 17225-2, duk da haka, ƙayyadaddun ƙayyadaddun abun ciki na makamashi ana bayyana shi azaman ƙimar calorific net, wanda kuma ake kira ƙaramin ƙimar dumama. Don PFI, ana bayyana ƙimar dumama azaman babban ƙimar calorific, ko ƙimar dumama mafi girma (HHV). Waɗannan sigogi ba su misaltuwa kai tsaye. ISO yana ba da iyaka cewa pellets A1 suna buƙatar girma ko daidai da 4.6 kilowatt-hour a kowace kg (daidai da 7119 Btu a kowace laban). Ma'aunin PFI yana buƙatar mai ƙira ya bayyana mafi ƙarancin HHV kamar yadda aka karɓa.

Hanyar ISO don chlorine nassoshi ion chromatography a matsayin hanya ta farko, amma tana da harshe don ba da damar dabarun bincike kai tsaye da yawa. PFI ya lissafa hanyoyin da aka karɓa da yawa. Duk sun bambanta cikin iyakokin gano su da kayan aikin da ake buƙata. Iyakar PFI don chlorine shine milligrams 300 (mg), kowace kilogram (kg) kuma buƙatun ISO shine 200 MG kowace kg.

A halin yanzu PFI ba ta da ƙarfe da aka jera a daidaitattun ta, kuma ba a ƙayyade hanyar gwaji ba. ISO yana da iyaka ga ƙarfe takwas, kuma yana nuni da hanyar gwajin ISO don nazarin karafa. TS EN ISO 17225-2 Hakanan yana lissafin buƙatun don ƙarin sigogi da yawa waɗanda ba a haɗa su cikin ka'idodin PFI ba, gami da zazzabi na lalacewa, nitrogen da sulfur.

Duk da yake ka'idodin PFI da ISO suna kama da kamanni ta hanyoyi da yawa, yana da mahimmanci a lura da sau da yawa bambance-bambance masu sauƙi a cikin ƙayyadaddun bayanai da hanyoyin gwajin da aka ambata, kamar yadda PFI da ISO ba koyaushe suke kwatankwacinsu ba.