Dab tsi yog qhov flash thiab qhov hluav taws kub los ntawm Cleveland Open Cup apparatus?

Flash Point thiab Hluav Taws Kub Ntsuas los ntawm Cleveland Open Cup (COC) Apparatus

Kev xeem Cleveland Open Cup (COC) yog ib txoj hauv kev (piv txwv li, ASTM D92, ISO 2592) rau kev ntsuas lub teeb nyem thiab qhov hluav taws kub ntawm cov khoom siv roj av, roj nplua nyeem, thiab lwm yam kua uas siv tau. Hauv qab no yog cov lus piav qhia ntxaws txog ob qhov tseem ceeb, cov qauv ntsuas, thiab cov txheej txheem:

1. Cov ntsiab lus tseem ceeb

a. Flash Point

Txhais: Qhov kub qis tshaj plaws uas cov kua emits txaus vapors los ua ib qho kev sib xyaw ua ke nrog huab cua, uas ignites momentarily (ib "flash") thaum raug nplaim taws qhib.

Cov Lus Cim Tseem Ceeb: Lub flash yog ib ntus (tsawg dua lossis sib npaug li 5 vib nas this) vim tias qhov vapor concentration tsuas yog siab dua qhov qis qis qis (LFL) thiab cov kua nws tus kheej tsis muaj kev sib txuas.

b. Qhov hluav taws kub

Txhais: Qhov kub qis tshaj plaws uas cov kua vapor tseem kub hnyiab tau yam tsawg 5 vib nas this sib law liag tom qab qhov hluav taws kub qhib.

Cov Lus Cim Tseem Ceeb: Ntawm qhov hluav taws kub, cov kua vapor tiam tus nqi txaus los tswj kev sib txuas, vim tias qhov vapor concentration tseem nyob saum LFL rau lub sijhawm ntev.

Kev sib raug zoo: Qhov taw tes hluav taws kub ib txwm siab tshaj qhov taw tes (feem ntau yog 5-40 degree, nyob ntawm cov kua volatility thiab muaj pes tsawg leeg). Cov kua dej tsawg dua (piv txwv li, cov roj lubricating hnyav) muaj qhov sib txawv loj dua ntawm cov ntsiab lus flash thiab hluav taws.

2. Test Apparatus (Cleveland Open Cup)

COC cov cuab yeej muaj cov khoom tseem ceeb hauv qab no (raws li ASTM D92):

Qhib khob: Lub khob tooj dag nrog lub ntim tshwj xeeb (100 mL) thiab qhov ntev (piv txwv li, 50 hli puab txoj kab uas hla, 60 hli qhov tob) kom ntseeg tau tias muaj qhov sib txuam vapor.

Heating Device: A controlled heater (e.g., electric coil) with a temperature rise rate of 5–6°C/min (for flash point >110 degree) los yog 1-2℃/ min (rau flash point Tsawg dua los yog sib npaug rau 110 degree) kom tsis txhob overheating.

Kub Sensor: Tus pas ntsuas kub lossis lub ntsuas kub tso rau hauv cov kua (10 hli saum lub khob hauv qab) los ntsuas cov kua kub kom raug.

Ignition Source: Ib lub nplaim me me (3-4 hli txoj kab uas hla) uas hla kab rov tav hla lub khob qhov chaw ntawm lub sijhawm tsis tu ncua (piv txwv li, txhua 1℃ze ntawm qhov xav tau flash point).

3. Cov txheej txheem xeem (ASTM D92 as Reference)

Kev Npaj Ua Qauv: Sau lub khob COC nrog cov kua ntsuas mus rau qib uas tau teev tseg (tsis txhob hla dhau).

Cua sov: Pib lub rhaub thiab kho qhov kub nce siab raws li cov kua qhov xav tau flash point (ceev ceev rau cov ntsiab lus siab flash, qeeb rau qis).

Ignition Checks: Raws li qhov kub thiab txias, hla lub nplaim taws hla lub khob qhov chaw ntawm qhov sib xws (piv txwv li, txhua 1℃thaum mus txog qhov ntsuas qhov ntsuas).

Flash Point Detection: Sau qhov kub thiab txias thaum lub teeb nyem (npog tag nrho lub khob saum npoo) tau pom. Qhov no yog qhov flash point.

Fire Point Detection: Txuas ntxiv cua sov cov kua tom qab lub teeb nyem. Rov ua dua qhov ntsuas hluav taws xob kom txog thaum lub vapor hlawv tsis tu ncua rau ntau dua lossis sib npaug li 5 vib nas this. Sau qhov ntsuas kub no ua qhov hluav taws kub.

Txias thiab ntxuav: Tsis txhob tso cua sov, tso cai rau lub tshuab kom txias, thiab ntxuav lub khob kom tsis txhob hla - paug rau kev sim tom ntej.

4. Cov ntawv thov tseem ceeb

Kev xeem COC yog dav siv rau:

Cov khoom siv roj av: roj diesel, roj lubricating, hydraulic kua, thiab asphalt (los soj ntsuam cov nplaim taws thiab kev nyab xeeb thaum khaws cia / tuav).

Industrial Liquids: Combustible solvents, coatings, thiab greases (kom ua raws li cov cai tswj kev nyab xeeb rau kev thauj mus los thiab siv chaw ua haujlwm).

Kev Tswj Xyuas Zoo: Txheeb xyuas tias cov khoom ua tau raws li cov qauv kev ua kom muaj hluav taws xob (xws li, qhov tsawg kawg nkaus flash point yuav tsum tau ua kom muaj kev nyab xeeb).

5. Kev txiav txim siab tseem ceeb

Atmospheric Pressure: Cov ntsiab lus hluav taws xob / hluav taws kub yog siab- nyob ntawm (qhov siab qis txo qhov flash point). Kev ntsuam xyuas feem ntau ua ntawm 1 atm (101.3 kPa); yuav tsum kho kom haum rau deviations.

Sample Contamination: Impurities (xws li dej, volatile solvents) tuaj yeem txo qhov flash point, ua rau cov txiaj ntsig tsis raug. Cov qauv yuav tsum yog ntshiab thiab qhuav.

Flame Height: Cov nplaim hluav taws kub hnyiab yuav tsum yog tus qauv (3-4 hli) kom ntseeg tau tias muaj qhov sib xws ntawm vapor flammability.

Qhib vs. Kaw khob: COC (qhib khob) yog tsim rau siab -flash- taw tes kua. Kaw-txoj kev khob (piv txwv li, Pensky-Martens) yog qhov zoo dua rau qis-flash- cov kua dej (kom tiv thaiv vapor poob).

6. Cov txiaj ntsig zoo rau cov kua dej ntau

Hom kua	Flash Point (degree)	Hluav taws kub Point (degree)
Cov roj lubricating hnyav	180–240	200–260
Diesel roj (Tsis yog. 2)	52–96	60–104
Hydraulic roj (ISO 46)	180–220	190–230
Asphalt (txiav)	60–120	70–130

Hauv cov ntsiab lus, Cleveland Open Cup apparatus muab ib txoj hauv kev txhim khu kev qha los ntsuas qhov flash thiab cov ntsiab lus hluav taws kub ntawm cov kua hluav taws xob, qhov tseem ceeb rau kev ntsuam xyuas lawv cov hluav taws kev nyab xeeb thiab ua raws li cov qauv kev lag luam.