Doppler Ultrasonic Flowmeters: Zofunikira Zofunikira pa Kusayera kwa Paipi

Mfundo Yogwirira Ntchito ndi Udindo wa Zodetsa

Zofunikira Zofunikira pa Zodetsa za Paipi

1. Kuchuluka kwa Tinthu

• Malo Ocheperako Olowera:Ma Doppler mitaPamafunika kuchuluka kochepa kwa zinthu zobalalitsa (nthawi zambiri ≥100 ppm pa tinthu tolimba kapena ≥0.1% voliyumu ya thovu). Pansi pa izi, chizindikiro chowonetsedwa chimakhala chofooka kwambiri kuti chizindikirike molondola, zomwe zimapangitsa kuti mawerengedwe osakhazikika kapena osadalirika awerengedwe.
• Kuchuluka Kwabwino Kwambiri: Pa ntchito zambiri, kuchuluka kwa 500–5,000 ppm (tinthu tolimba) kapena 1–5% ya thovu kumapereka zotsatira zofanana kwambiri. Kuchuluka kwa zinthu kungayambitse kusokonezeka kwa zizindikiro chifukwa cha kufalikira kwambiri, zomwe zimachepetsa kulondola kwa muyeso.

2. Kukula kwa Tinthu ndi Kugawa

• Kukula Kogwira Mtima: Zobalalitsa ziyenera kukhala zazikulu mokwanira kuti ziwonekereakupangaMafunde koma ang'onoang'ono mokwanira kuyenda ndi madzi. Kawirikawiri, tinthu tating'onoting'ono kapena thovu pakati pa 10 μm ndi 3 mm ndi abwino kwambiri. Tinthu tating'onoting'ono (monga, <1 μm) sitingasonyeze zizindikiro mwamphamvu, pomwe zinthu zazikulu zolimba (monga, >5 mm) zingayambitse kusokonezeka kwa kayendedwe ka madzi kapena kutsekeka, kusokoneza ma profiles a liwiro.
• Kugawa Mofanana: Kugawa tinthu tosafanana (monga, kukhazikika kwa zinthu zolimba m'mapaipi otsika liwiro) kungapangitse "malo akufa" ndi zinthu zosakwanira zobalalitsira, zomwe zimapangitsa kuti pakhale zolakwika muyeso. Kuyenda kosasunthika kapena kapangidwe koyenera ka mapaipi (monga, magawo owongoka olowera) kumathandiza kuti tinthu tisakhale ndi malo ofanana.

3. Mtundu wa Tinthu ndi Kapangidwe ka Acoustic

• Kusiyana kwa Acoustic: Zofalitsa ziyenera kukhala ndi impedance yosiyana ya acoustic kuposa madzi oyambira. Mwachitsanzo, thovu la mpweya m'madzi kapena tinthu tolimba mu mafuta limapanga mawonekedwe amphamvu owunikira, pomwe zinthu zolimba zosungunuka (monga mchere) zomwe sizipanga tinthu tating'onoting'ono sizigwira ntchito.
• Zipangizo Zosawononga: Tinthu tomwe timawononga kwambiri (monga mchenga m'mapaipi otayira madzi) tingawononge malo osinthira magetsi pakapita nthawi, zomwe zimachepetsa nthawi yogwiritsira ntchito mita. Zophimba zoteteza kapena malo osinthira magetsi (monga, kuyika ngodya) zitha kuchepetsa chiopsezochi.

4. Kugwedezeka kwa Madzi ndi Kuthamanga

• Kugwedezeka Kumathandiza Kubalalika: Kugwedezeka pang'ono kumawonjezera kufalikira kwa tinthu tating'onoting'ono, ndikuwonjezera kukhazikika kwa chizindikiro. Komabe, kugwedezeka kwambiri (monga ma valve kapena zigongono) kungapangitse kuti kayendedwe kake kakhale kosokonezeka, zomwe zimapangitsa kuti Doppler isasinthe.
• Liwiro Lochepa: Liwiro la kuyenda liyenera kupitirira malire (nthawi zambiri ≥0.1 m/s) kuti zitsimikizire kuti tinthu tikuyenda bwino komanso kuti zizindikiro zizipezeka mosavuta. Pa liwiro lochepa kwambiri, tinthu timeneti tingakhazikike, zomwe zimachepetsa kuchuluka kwa zinthu zobalalitsa bwino.

Mavuto a Mikhalidwe Yosayenera Yodetsedwa

• Zosakwanira za Scatterers: Kuchuluka kochepa kwa tinthu tating'onoting'ono (monga madzi oyera) kumabweretsaMa Doppler mitaZosayenera, chifukwa palibe chizindikiro choyezeka chomwe chimapangidwa. Muzochitika zotere, ma ultrasound kapena makina oyezera nthawi yodutsa angakhale oyenera kwambiri.
• Zobalalitsa Zambiri: Madzi okhuthala kwambiri kapena thovu lamadzimadzi lingayambitse "kuchulukana kwa zizindikiro," komwe kuwunikira kambiri kumasokonezana, zomwe zimapangitsa kuti pakhale phokoso. Ma algorithms apamwamba opangira zizindikiro (monga kusefa kosinthika) angathandize kuchepetsa vutoli.
• Tinthu Togwirizana: Tinthu tomata kapena tomwe timasonkhana (monga matope) tingamatirire ku makoma a mapaipi kapena ma transducer, zomwe zimachepetsa kuyenda bwino kwa zinthu zobalalitsa ndi kuyambitsa kusiyana kwa kuyeza. Kuyeretsa mapaipi nthawi zonse kapena zophimba zoletsa kuipitsidwa kumalimbikitsidwa m'malo otere.

Kugwiritsa Ntchito Moyenera ndi Njira Zochepetsera Vutoli

• Kuchiza Madzi Otayidwa:Ma Doppler mitaKuchita bwino kwambiri chifukwa cha kuchuluka kwa zinthu zolimba (monga zinthu zolimba zomwe zimapachikidwa mu ma clarifier oyambira). Kusamalira nthawi zonse kuti transducer isawonongeke ndikofunikira kwambiri.
• Ma slurries a Mafakitale: M'mafakitale a migodi kapena mankhwala, kuonetsetsa kuti tinthu tating'onoting'ono timafalikira (kudzera mu zolekanitsa za sieving kapena cyclone) komanso kugwiritsa ntchito ma transducers osatha kutopa kumathandiza kuti zinthu ziyende bwino.
• Kuyenda kwa Gasi ndi Madzi M'magawo Awiri: M'mapaipi a mafuta ndi gasi, gawo la thovu liyenera kuyang'aniridwa kuti lipewe kusakhazikika kwa chizindikiro. Mapangidwe a Doppler okhala ndi njira zambiri kapena mita yolumikizirana ya Doppler-transit-time ingathandize kulondola pakuyenda kovuta kotereku.

Mapeto