Hauv kev lag luam roj sib cais, cov nitrogen purity ntawm PSA lossis membrane nitrogen generators ncaj qha cuam tshuam rau kev ruaj ntseg hauv cov khoom siv hluav taws xob, tshuaj, khoom noj, tshuaj, thiab lwm yam lag luam. Hauv kev xyaum, purity fluctuations los yog persistent off-spec tej yam kev mob yog muaj. Raws li xyoo dhau los ntawm kev ua haujlwm ntawm Shenger Gas, ntau tus neeg siv yuav xav txog tam sim ntawd "hloov adsorbents" lossis "kho lub tshuab tsis zoo" thaum ntsib teeb meem purity, tab sis qhov kho tiag tiag feem ntau pib nrog kev kuaj xyuas ib ntus. Kab lus no qhia txog cov laj thawj feem ntau thiab kev kuaj mob rau cov kws ua haujlwm hauv teb.
Lub Purity Nyeem Nws tus kheej yuav tsis ntseeg
Ua ntej, paub meej tias qhov yuav tsum tau saib xyuas tsis tu ncua: tus neeg soj ntsuam nyeem ntawv puas muaj kev cuam tshuam cov nitrogen purity hauv cov kav dej?
- Qhov chaw ntsuas qhov ntsuas tsis zoo - Yog tias qhov chaw nres nkoj piv txwv ze dhau ntawm lub qhov hluav taws xob tsis muaj lub tank lossis nyob rau hauv qhov chaw tuag, cov roj uas tsis muaj zog tuaj yeem sib xyaw ua ke, ua rau kev nyeem ntawv hloov pauv. Kev pom zoo: tso qhov piv txwv rau hauv nruab nrab ntawm cov kav dej loj lossis siv cov qauv ua ntej ua ntej.
- Uncalibrated analyzer - Zirconia lossis paramagnetic oxygen analyzers ya raws sijhawm. Siv cov roj calibration (piv txwv li, 99.999% N₂ lossis cov pa oxygen sib xyaw) rau kev sib piv. Yog hais tias sib txawv tshaj ± 0.05%, recalibrate.
- Cov qauv ntws txawv txav lossis siab - siab dhau lossis qis dhau los cuam tshuam cov lus teb sensor. Nrog rau phau ntawv ntsuas ntsuas thiab ua kom cov qauv ntws ruaj khov ntawm tus nqi pom zoo (feem ntau 0.5–1.5 L / min), thaum ua kom cov qauv txo qis tas li.
Tsis txhob ua qhov muag tsis pom kev kho cov khoom siv ua ntej lees paub cov ntaub ntawv ntsuas kev ntseeg siab.
Imbalance hauv Adsorption & Regeneration (rau PSA Nitrogen Generators)
Rau PSA nitrogen generators, lub hauv paus ua rau purity teeb meem feem ntau yog nyob rau hauv lub adsorption ntauwd hloov lub sij hawm thiab carbon molecular sieve (CMS) mob.
1. Lub sij hawm lub voj voog sib txawv ntawm cov qauv tsim
PSA units cia siab rau cov valve ceev kom hloov adsorption thiab desorption. Thaum inlet cua ntws, siab, los yog downstream xav tau hloov pauv loj yam tsis tau hloov lub sij hawm hloov, CMS yuav tsis rov tsim dua nyob rau lub sij hawm ua ntej saturation. Hla - kuaj xyuas cov khoom qub kev ua haujlwm nkhaus thiab rov ua kom lub sijhawm ntawm kev siv zog, adsorption, sib npaug, thiab venting. Yog hais tias purity yog drifting downwards maj mam, sim txo lub sij hawm adsorption los ntawm 0.5-2 vib nas this thiab saib cov kev hloov.
2. CMS lom los yog pulverization
Cov roj pos huab, dej ua kua, thiab cov ntsiab lus siab ntawm CO₂ txuas rau CMS micropores, ua rau tsis muaj peev xwm rov qab tau. Tshawb xyuas qhov kev kho cua sab saud: xyuas tias lub tshuab ziab khaub ncaws cua txias dew taw tes ua tau raws li qhov yuav tsum tau ua (feem ntau Tsawg dua lossis sib npaug li -40 degree) thiab cov roj lim tshem tawm qhov tseeb tsawg dua lossis sib npaug li 0.01 ppm. Yog tias cov hmoov dub (CMS plua plav) tshwm nyob rau ntawm qhov hluav taws xob adsorber lossis qhov sib npaug ntawm lub qhov hluav taws xob ua suab nrov txawv txav, CMS tau degraded thiab xav tau topping lossis hloov.
3. Kev faib tawm tsis sib xws
Thaum lub elastic compression ntaus ntawv nyob rau hauv lub PSA adsorber tsis ua hauj lwm los yog lub distributor phaj yog clogged, airflow "luv-circuits" nyob rau hauv lub nkoj phab ntsa, tawm hauv ib feem ntawm lub CMS tsis siv. Infer qhov no los ntawm kev sib piv lub siab poob thoob cov yees nrog lub Hoobkas qhov tseem ceeb: kev khiav hauj lwm qhov sib txawv yog 0.02-0.05 MPa. Yog tias qhov tseem ceeb qis dua thiab purity tsis zoo, nres lub tsev thiab tshuaj xyuas cov khoom xa tawm sab hauv.
Pub Cua Zoo & Flow Mismatch
Lub tshuab hluav taws xob nitrogen yog qhov tseem ceeb ntawm huab cua sib cais. Pub huab cua huv huv, siab, thiab ntws yuav tsum ua raws li kev tsim ciam teb.
- Excessive oil content – Even with three-stage filtration, if the air compressor uses poor-quality lubricant or the oil separator fails, trace oil mist can break through the treatment system. Use an oil vapor detector tube at the activated carbon filter outlet. If total oil >0.003 mg / m³, hloov cov lim dej thiab tshuaj xyuas cov compressor.
- Tsis txaus los yog hloov pauv hloov siab - Adsorption efficiency nplai nrog siab. Txheeb xyuas qhov ntsuas qhov siab inlet. Yog tias qhov ntsuas qis dua (piv txwv li, ntsuas 0.75 MPa tab sis qhov tseeb 0.6 MPa), cov khoom siv nitrogen poob. Yog tias cov dej ntws tsis hloov pauv, purity yuav poob. Ua ntej, xyuas kom lub tshuab cua compressed tuaj yeem muab lub peev xwm xav tau, lossis txo lub tshuab hluav taws xob nitrogen qhov ntsuas qhov chaw.
- Cov dej lwg siab dhau heev - Lub tub yees tsis ua haujlwm lossis lub tshuab ziab khaub ncaws tso cai rau cov dej noo ntau dhau mus rau hauv lub adsorber, qhov dej vapor nyob hauv CMS adsorption qhov chaw. Ntsuas qhov siab dew point tom qab lub tshuab ziab khaub ncaws. Yog tias siab tshaj -20 degree, kho cov khoom kom qhuav thiab rov tsim dua lossis hloov desiccant.
Cov qauv siv tsis zoo hauv qab
Qee lub sij hawm cov khoom siv nitrogen tsim nws tus kheej zoo, tab sis purity ntawm cov kav dej kawg tseem nyeem qhov txawv txav.
- Cov kav dej xau - tshwj xeeb tshaj yog nrog cov qauv nqus tsev vacuum lossis qis - xaim xaim, xau xaim huab cua rau hauv kab. Siv cov kua dej kom pom los yog siv lub tshuab nqus dej ultrasonic ntawm txhua qhov fittings. Rau me ntsis zoo siab N₂ kab (hauv qab 0.2 MPa), cov xau yog ib qho nyuaj rau kev kuaj xyuas nrog lub ntsuas siab; ua stepwise siab-tuav xeem.
- Tsis muaj peev xwm tsis txaus ua rau muaj kev kub ntxhov siab - Thaum cov khoom siv downstream rub tawm tam sim ntawd dhau ntawm lub tshuab hluav taws xob cov khoom tso tawm, tsis muaj lub tank siab poob qis. Qhov no yuav ua rau lub qhov hluav taws xob adsorber valve qhib ntxov ntxov, xa cov "lub teeb xaus" rau hauv lub header. Ntxiv ib lub tank ntxiv rau ntawm txoj kab tseem ceeb lossis txwv qhov siab tshaj plaws ntws ntws.
- Kev tshem tawm tsis tiav ntawm kev tuag- ceg kav dej - Tom qab kaw thiab rov pib dua, huab cua nyob hauv cov kab ntev ntev yuav tsis raug tshem tawm. Txhim kho cov vents tshwj xeeb. Rau thawj 5-10 feeb ntawm kev rov pib dua, tso cov ceg ntawd mus rau qhov chaw kom txog thaum purity raws li spec, ces hloov mus rau qhov chaw siv.
Kev kuaj tshwj xeeb rau Membrane Nitrogen Generators
Yog tias koj siv lub tshuab hluav taws xob membrane nitrogen (ib txwm rau cov ntawv me me - ntws los yog cov ntawv xov tooj ntawm tes), qhov kev kuaj mob sib txawv me ntsis:
- Aging membrane module - Hollow fiber membranes rhiab rau qhov kub thiab txias, pub siab, thiab permeate - sab nraub qaum. Yog hais tias cov khoom purity tsis tu ncua poob nyob rau hauv tib lub siab pub thiab ntws tej yam kev mob thiab kev hloov kho tsis pab, selectivity yuav poob. Taug qab runtime teev; membrane kev pab lub neej yog feem ntau 3-8 xyoo.
- Pub kub tawm ntawm qhov ntau - Membrane sib cais efficiency degrades thaum kub nce. Tshawb xyuas lub tshuab cua txias tom qab thiab lub tshuab cua sov ntawm cov cua compressor kom paub meej tias cov roj kub nkag mus rau hauv daim nyias nyias yog nyob rau hauv cov chaw tsim tshuaj paus qhov ntau (feem ntau 20-50 degree).
- Ntau dhau permeate- sab nraub qaum - Yog tias cov kab permeate (oxygen-enriched vent) kab thaiv los yog rov qab siab tshaj 5 kPa, lub zog tsav tsheb rau oxygen- nitrogen cais tawm poob. Tshawb xyuas cov silencers thiab cov kav dej rau condensate khov los yog khib nyiab .
Pom zoo rau ntawm -Site Troubleshooting Sequence
Rau cov kab ntau lawm uas nyuam qhuav ntsib tawm -spec purity, ua raws li qhov kev txiav txim no kom tsis txhob siv dag zog:
- Kaw cov kev siv qis qis thiab khiav lub tshuab hluav taws xob ntawm kev thauj khoom tag nrho rau 10 feeb. Yog hais tias purity rov qab, qhov teeb meem yog dhau - ntws thov.
- Tshawb xyuas lub ntsuas ntsuas siv cov roj calibration; kuj hloov cov sampling kab lim.
- Sau cov ntaub ntawv tseem ceeb - pub siab, dej lwg taw tes, ntauwd siab poob, lub sij hawm voj voog, cov khoom ntws.
- Saib xyuas qhov chaw nres nkoj - thaum lub sij hawm PSA venting, puas muaj ntau cov hmoov dub (CMS plua plav) paug?
- Maj mam txo lub sij hawm adsorption nyob rau hauv 0.5-1 thib ob kauj ruam thiab saib purity sib.
- Yog tias cov kauj ruam saum toj no tsis muaj txiaj ntsig, sau cov qauv roj thiab xa mus rau thib peb -chaw kuaj mob rau GC kev tshuaj xyuas los txiav txim qhov ntsuas qhov yuam kev thiab txheeb xyuas cov khoom tsis huv (O₂, Ar, H₂O, VOCs, thiab lwm yam).
Nitrogen purity teeb meem tsis tshua muaj tshwm sim los ntawm ib qho kev ua tsis tiav. Ntau zaus, lawv tshwm sim los ntawm ntau yam sib txawv ua ke: pub huab cua zoo, tswj lub sijhawm, CMS mob, thiab kev tswj xyuas kev siv. Khaws ib lub cav txhua hnub rau koj lub tshuab hluav taws xob nitrogen: sau cov khoom noj siab, dew point, purity, ntws, thiab lub sijhawm voj voog. Cov ntaub ntawv tsis tu ncua qhia cov kev hloov pauv zoo dua li ib qho - tawm cov tshev. Ntawm Shenger Gas, peb hais qhia rau txhua tus neeg siv: lub tshuab hluav taws xob nitrogen yog lub tshuab ua haujlwm - kev kho cua ntws ntws thiab kev tswj xyuas kev siv qis rau tsawg kawg ib nrab ntawm lub luag haujlwm. Phau ntawv qhia kev daws teeb meem no yog npaj los pab cov kws ua haujlwm hauv cheeb tsam kom tsis txhob muaj kev cuam tshuam tsis tsim nyog.
