Ɔhyew a Wɔde Di Dwuma Yiye Tubes
- Carbon & Carbon Alloy Dade a Wɔde Yɛ Nneɛma
- Dade a Ɛnyɛ Den
- Kɔbere & Nickel Alloy a Wɔde Yɛ Adwuma
- Ɔhyew a Wɔde Di Dwuma Yiye Tubes
- Pipe Fittings a Wɔde Yɛ Nneɛma
- Pipe Flanges a Wɔde Yɛ Nneɛma
- Gasket, Stud Bolt &Nut a wɔde yɛ nneɛma
- Nnwumayɛbea Valves
01. Ɔde ne nsa kyerɛɛ ne so
Finned Tubing ma Ɔhyew Transfer Efficiency Tu mpɔn
Akwan a Wɔfa so Yɛ Finned Tubes
Wɔde akwan horow na ɛyɛ fined tubes a egyina nneɛma a wɔde yɛ, sɛnea wɔde di dwuma, ne adwumayɛ a wɔhwehwɛ so:
1. Nnua a Wɔde Fi Afiri Mu (Integral Fins) .
- a wode bimetallic tube (s.e., aluminum akyi ade a ewo dade anaase kobere core so) fa afiri bi a eyi fins fi akyi layer no mu.
- ma mfiri ahoɔden a eye kyɛn so ne ɔhyew a ɛkɔ.
- a wode di dwuma wo ɔhyew a ɛkorɔn te sɛ ɔhyew a wɔsan nya nhyehyɛe mu.
2. Nhama a Wɔakyekyere (Spiral).
- a wode helical kyekyere dade a wode twitwiw base tube no ho na wode adhesive, brazing, anaa welding kyekyere.
- a ɛho ka sua na wɔde di dwuma kɛse wɔ ɔhyew a wɔde sesa mframa a ɛyɛ nwini mu.
- a emfata mma ɔhyew a ɛkorɔn yiye esiane sɛ bond no betumi adi huammɔ nti.
3. Nneɛma a Wɔde ahyɛ mu (G-Fin) Fins
- a wode afiri na ewo tube no mu, na wode fin strip bi hyehye mu na wode mfiri to mu.
- a eye thermal contact ne ahoɔden a ɛko tia fin loosening.
- abu so wo process heaters ne boilers mu.
4. Fins a Wɔde Weld ayɛ
- a wode afiri a woahyehye no mmiako mmiako wo tube no so (s.e., L-foot, overlapped, anaa stud-welded fins).
- a efata ma ɔhyew a ɛkorɔn ne nhyɛsoɔ a ɛkorɔn (sɛ nhwɛsoɔ no, economizers, waste heat recovery).
- a ne bo yɛ den nanso ɛyɛ den yiye.
5. Fins a Ɛtrɛw
- fins tu mmirika parallel to tube axis, a wode di dwuma wo baabi a axial flow a wɔpɛ (sɛ nhwɛso no, wɔ mframa coolers ne condensers binom mu).
- taa wohu wo petrochemical dwumadie mu.
6. Nnua a Wɔde Nnua a Wɔahyehyɛ
- a wode weld studs nketewa gu tube no ani so ma turbulence ne ɔhyew a ɛkɔ soro no kɔ soro.
- a wode di dwuma wo fluidized bed heat exchangers ne boilers mu.
Finned Tubes ahorow a agye din wɔ ɔhyew a wɔde fa nneɛma mu
1. Helical (Spiral) Nsuo a Ɛyɛ Nsuo a Ɛyɛ Nsuo
- a wɔtaa de di dwuma, a wɔde di dwuma wɔ mframa a ɛma ɔhyew sesa (ACHEs) mu.
- Nneɛma a wɔde yɛ: Aluminium (a wɔde gyina nsɛeɛ ano), kɔbere, anaa dadeɛ a ɛnyɛ den.
2. Fin Tubes a wɔde ahyɛ mu
- a ɛyɛ hyew a ɛkorɔn, a wɔde di dwuma wɔ ɔhyew a wɔde san nya nsuo a ɛyɛ hyew (HRSGs) ne sikasɛm mu ahoɔdennuru mu.
- Base tube: Carbon dade / dade a ɛnyɛ den; Nneɛma a wɔde yɛ akyi: Aluminium.
3. L-Nan & LL-Nan Finned Tubes
- fins wo "L" shape wo ase ma bonding yie.
- a wode di dwuma wo refinery ne power plant dwumadie mu.
4. Nnua a Wɔde Nnua a Wɔahyehyɛ
- fins wo ntwitwiridii a ɛbɛma turbulence ne ɔhyew a ɛkɔ baabi foforo no ayɛ kɛse.
- a wode di dwuma wo gas-to-gas heat exchangers mu.
5. Nsuo a Wɔde Nsuo a Wɔabɔ no Knurled
- surface roughening ma ɔhyew a ɛkɔ condensers ne evaporators mu tu mpɔn.
6. Nsuo a Wɔde Nsuo a Ɛyɛ Nsuo a Ɛyɛ Nsuo
- a wavy fins ma asase ani ne turbulence kɔ soro, na ɛma adwumayɛ tu mpɔn.
Nneɛma a Wɔpaw Ma Finned Tubes
- Temperature & Pressure: High-temp dwumadie hia welded anaa extruded fins.
- Corrosion Resistance: Aluminium fins ma acidic nneɛma a atwa yɛn ho ahyia, stainless dade ma tebea a emu yɛ den.
- Nsuo Su: Gas-side fins hia soro soro (helical/serrated), bere a nsuo-fã betumi de low-fin tubes adi dwuma.
- Ka: Wrapped fins yɛ sikasɛm, bere a extruded / welded fins yɛ pricier nanso ɛyɛ den.
Nnwuma a Wɔde Di Dwuma
- Tumi Mfiridwuma: Condensers a mframa na ɛma ɛyɛ nwini, HRSGs.
- Oil & Gas: Nneɛma a wɔde yɛ preheaters, fononoo.
- HVAC: Nneɛma a wɔde yɛ chiller, radiators.
- Nnuru: Ɔhyew a wɔsɛe no a wɔde yɛ nsuo, reactors.
Finned Tube ne Fin Nneɛma a Wɔde Yɛ Adwuma Yiye
Nneɛma a wɔpaw ma finned tubes wɔ ɔhyew a wɔde fa mfiri mu no gyina nneɛma te sɛ ɔhyew, nhyɛso, nsɛe a ɛko tia, ɔhyew a ɛkɔ mu, ne ɛka so. Ase hɔ no yɛ dade ne dade nneɛma a agye din sen biara a wɔde yɛ finned tubes, a wɔakyekyɛ mu sɛnea base tube nneɛma ne fin nneɛma:
1. Nneɛma a Wɔde Yɛ Base Tube (Core Tube) .
Base tube no kura nsu titiriw (nsu/mframa) na ɛsɛ sɛ egyina nhyɛso, ɔhyew, ne nsɛe ano.
Carbon Dade (CS) a Wɔde Yɛ Nneɛma .
- Grades: ASTM A179, A192, A210 (ma nsuo a wɔde yɛ nsuo & ɔhyew a wɔde sesa)
- Pros: Ɛka a ɛba fam, ahoɔden pa, ɛfata ma nhyɛso a ɛkorɔn applications.
- Cons: Ɛyɛ mmerɛw sɛ ɛbɛhyew; wɔtaa de nneɛma a wɔde kata so a ɛbɔ ho ban anaasɛ bere a nneɛma a atwa yɛn ho ahyia no nsɛe no.
- dwumadie: Boilers, economizers, steam condensers.
Dade a Ɛnyɛ Den (SS) .
- Abasobɔde ahorow: .
- 304/304L – General-purpose, papa a ɛko tia nsɛe.
- 316/316L – Ɛko tia chloride ne acid yie (wɔde di dwuma wɔ nnuruyɛ afifideɛ mu, ɛpo mu nneɛma a atwa yɛn ho ahyia).
- 321/347 – Stabilized grades ma ɔhyew a ɛkorɔn dwumadie (sɛ nhwɛsoɔ, exhaust gas ɔhyew a wɔsan nya).
- Pros: Excellent corrosion resistance, ahoɔden a ɛkorɔn a ɛyɛ hyew.
- Cons: Ne boɔ yɛ den, ɛyɛ thermal conductivity a ɛba fam sene carbon steel.
- dwumadie: Refineries, nnuru a wɔde yɛ adwuma, aduane adwumayɛ.
Alloy Steels (High-Ɔhyew & Nsɛe a ɛko tia) .
- Abasobɔde ahorow: .
- T5 (P5), T9 (P9), T11 (P11) – Chrome-molybdenum dadeɛ a wɔde yɛ nsuo a ɛyɛ hyew a ɛkorɔn.
- T22 (P22), T91 (P91) – Wɔde di dwuma wɔ anyinam ahoɔden mfiri mu ma superheaters ne ɔhyew a wɔsan nya ho nhyehyɛe.
- Pros: High creep resistance, eye ma ɔhyew a ano yɛ den (ɛkɔ 600°C +).
- Cons: Ɛka a ɛkɔ soro sen carbon steel.
Kɔbere & Kɔbere Alloys
- Nkyekyɛmu: C12200 (Kɔbere a wɔayi phosphorus afiri mu), C70600 (Cu-Ni 90/10), C71500 (Cu-Ni 70/30).
- Pros: Ɔhyew a ɛkyɛn so, eye ma ɔhyew a ɛba fam dwumadie.
- Cons: Ɛyɛ mmerɛw, ɛtaa sɛe wɔ nsuo a ɛkɔ ntɛmntɛm mu.
- dwumadie: HVAC, frigye, condensers.
Nickel Alloys (Ma Tebea horow a Ɛyɛ Den) .
- Abasobɔde ahorow: .
- Inconel 600/625 – Nkonimdie a ɛkorɔn a ɛko tia oxidation ne chlorides.
- Monel 400 – Ɛko tia ɛpo mu nsuo ne acidic nneɛma a atwa yɛn ho ahyia.
- Pros: Superior corrosion resistance, ahoɔden a ɛkorɔn a ɛyɛ hyew.
- Cons: Ne bo yɛ den yiye.
- Dwumadie: Po so ngo & gas, nnuru a wɔde yɛ adwuma.
2. Fin Nneɛma a Wɔde Yɛ Adwuma
Fins ma ɔhyew a ɛkɔ nipadua no mu no yɛ kɛse na ɛsɛ sɛ ɛkari pɛ wɔ ɔhyew a ɛkɔ mu, sɛnea ɛko tia nsɛe, ne ɛka a wɔbɔ.
Aluminium (Nea Ɛtaa Yɛ Ma Fins) .
- Mfasoɔ a ɛwɔ mu:
- a ɛyɛ hyew a ɛkɔ soro.
- a emu ye hare, entumi nsɛe (ɛyɛ ahobammɔ oxide layer).
- a ne bo yɛ den sɛ wɔde toto kɔbere anaa dadeɛ a ɛnyɛ den ho a.
- Cons: Low melting point (~660 ° C), ɛnyɛ nea ɛfata ma temps a ɛkorɔn yiye.
- dwumadie: Air-cooled heat exchangers (ACHEs), radiators.
Kɔbere (Ahoɔden a Ɛma Nsu Kɔkɔɔ) .
- Pros: Best thermal conductivity, eye ma low-ɔhyew dwumadie.
- Cons: Ne bo yɛ den, ɛtaa yɛ oxidation wɔ mmeae a ɛhɔ yɛ nwini.
- dwumadie: Fridge, condensers.
Stainless Steel (Ma Nneɛma a Atwa Yɛn Ho Ahyia a Ɛyɛ Den) .
- Abasobɔde: SS 304, 316, 321 (sɛnea base tube abasobɔde yɛ pɛ).
- Pros: Corrosion-resistant, ɛyɛ den wɔ ɔhyew a ɛkorɔn mu.
- Cons: Ɔhyew a ɛkɔ fam sen Al/Cu.
- dwumadie: Nnuruyɛ afifideɛ, ɔhyew a wɔsɛe no a wɔsan nya.
Carbon Steel (Ɔkwan a Ɛho Ka sua) .
- Pros: Ne bo yɛ mmerɛw, ɛyɛ den.
- Cons: Rusts mmerɛw gyese galvanized anaase coated.
- dwumadie: Nneɛma a atwa yɛn ho ahyia a ɛnyɛ den pii, mfiridwuma mu ɔhyew.
Bimetallic Fins (Wiase Abien Nyinaa a Ɛyɛ Paara) .
- Nhwɛsoɔ: Aluminium fins a ɛwɔ carbon steel anaa stainless steel tube so.
- Pros: Ɛka Al conductivity ne dadeɛ ahoɔden bom.
- dwumadie: Tumi a wɔde yɛ anyinam ahoɔden, ɔhyew a wɔde san nya nsuo a ɛyɛ hyew (HRSGs).
Nneɛma a Wɔpaw Ho Akwankyerɛ
| Akwankyerɛ | Base Tube a wɔkamfo kyerɛ | Fin Material a Wɔkamfo Kyerɛ |
| Mframa a ɛma ɛyɛ nwini a wɔde sesa ɔhyew | Carbon dadeɛ / SS 304 | Aluminium (a ɛtaa ba) |
| Boilers & sikasɛm ho adwumayɛfo | Karbon dadeɛ (A192, P11) | Carbon dade / SS |
| Nnuruyɛ afifide | SS 316 / Nickel a wɔde afrafra | SS 316 / Aluminium a wɔde yɛ nneɛma |
| Fridge & HVAC | Kɔbere | Kɔbere / Aluminium |
| Mframa a ɛma mframa fi mu a ɛyɛ hyew kɛse | SS 321 / Inconel | SS 321 / Dade a wɔde afrafra a ɛkorɔn |
Nneɛma Titiriw a Ɛsɛ sɛ Wosusuw Ho Bere a Worepaw Nneɛma a Wɔde Yɛ Adwuma no
1. Ɔhyew a ɛwɔ mu:
-
- 200°C–500°C: Dade a ɛnyɛ den a wɔde yɛ ntaban.
- > 500°C: Dadeɛ a wɔde afrafra kɛseɛ (T22, T91) anaa Inconel.
2. Nneɛma a Atwa Yɛn Ho Ahyia a Nsɛe:
- Po so/po so: Cu-Ni anaase Monel.
- acidic/nnuru: SS 316 anaase nikel afrafra.
3. Ɔhyew Conductivity Ahiade:
- Nea eye sen biara: Kɔbere > Aluminium > Carbon Steel > Dade a ɛnyɛ den.
4. Ka a wɔbɔ ne nea wɔyɛ:
- aluminum fins a ewo carbon steel tubes so ma kari pɛ pa.
- a wode nickel afrafra di dwuma bere a ehia koraa nkutoo.
Wopɛ sɛ wokra saa ara ? Di yɛn ho nkɔmmɔ Seesei na fa w’abisade no mena!
