schimbatoare de caldura -...
TRANSCRIPT
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SCHIMBATOARE DE SCHIMBATOARE DE CALDURACALDURA
cu suprafete extinse
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NECESITATEA UTILIZARIINECESITATEA UTILIZARII
o Cand coeficientii individuali de transfer termic aicelor doua fluide au valori mult diferite:
- abur in condensare: 5000 – 21000 W.m-2.K-1;- aer care se incalzeste: 3 – 150 W.m-2.K-1;- un schimbator de caldura obisnuit asiguraun coeficient global de transfer K:
)K W/(m148
1501
5,4710.2
210001
111
1K 23
21
⋅=++
=
α+
λδ
+α
= −
∑
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APLICATIIAPLICATIIo Industria criogenica;o Racirea echipamentelor de calcul;o Racirea motoarelor autovehiculelor;o Racirea motoarelor vehiculelor spatiale;o Instalatii de climatizare;o Ingineria nucleara;o Incalzirea/racirea sangelui (chirurgie);o Incalzirea/racirea fluidelor viscoase(industria alimentara).
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU ARIPIOARECU ARIPIOARE
o Intrare agent termic;
o Iesire agent termic;
o Intrare fluid de incalzit;
o Iesire fluid de incalzit.
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU ARIPIOARECU ARIPIOARE
Aripioarele se monteaza de partea agentului cu α mai mic, astfel incat:
α1 - coeficientul de transfer de la fluidul din tevila peretele neted al tevii;
α2 - coeficientul de transfer de la suprafata cu aripioare la fluidul dintre tevi;
A - suprafata interioara a tevilor;A2 - suprafata exterioara a tevilor cu aripioare.
221 AA ⋅α≅⋅α
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU ARIPIOARECU ARIPIOARE
Ecuatia generala a transferului termic devine:
∑ ⋅α
+λδ
+α
Δ⋅=Δ⋅⋅=
221
medmed
AA11
TATAKQ
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU ARIPIOARECU ARIPIOARE
a) Aripioare longitudinale;b) Aripioare transversale.
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU ARIPIOARECU ARIPIOARE
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SCHIMBATOARE SCHIMBATOARE DE CALDURADE CALDURA
CU ARIPIOARECU ARIPIOARE
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU ARIPIOARECU ARIPIOARE
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU TEVI STRIATECU TEVI STRIATE
Tevi cu suprafete exterioare extinse obtinuteprin prelucrarea mecanica a tevii– tevi striate (nervurate)
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU TEVI STRIATECU TEVI STRIATE
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACOAXIALE CU TEVI CU COAXIALE CU TEVI CU SUPRAFETE EXTINSESUPRAFETE EXTINSE
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TEVI ONDULATETEVI ONDULATE
Ondulatiile tevilorconduc la:
1. marirea turbulentei; 2. Cresterea valorii
coeficientilor de transfer termic;
3. Cresterea suprafeteide transfer de caldura.
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AVANTAJE COMPARATIV CU SCFT SI SCPAVANTAJE COMPARATIV CU SCFT SI SCP
o Unitati compacte;o Distributie uniforma a temperaturilor;o Timp de stationare scurt;o Retentie minima de produs;o Posibilitati de curatire in flux (CIP);o Flexibilitate in dimensionarea spatiului inelar;o Gama diversificata de materiale de constructie;o SC tip MONOTUB pot procesa particule de pana
la 50 mm.
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APLICATIIAPLICATII
o Fluide cu viscozitateridicata;
o Fluide cu fibre in suspensie;
o Fluide cu particulesolide mari(pana la 50 mm).
o Glicoli si alcool;o Uleiuri vegetale si minerale;o Extracte de cafea, ceai;o Siropuri de zahar;o Produse lactate;o Pulpe si sucuri de fructe;o Extract de malt;o Sosuri si siropuri;o Paste si piureuri de tomate;o Bucati de fructe;o Alte produse alimentare.
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CONSTRUCTIE MONOTUBCONSTRUCTIE MONOTUB
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CONSTRUCTIE MULTITUBCONSTRUCTIE MULTITUB
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CONSTRUCTIE CONSTRUCTIE TIP “SCFT”TIP “SCFT”
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CONSTRUCTIE INELARACONSTRUCTIE INELARA
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o Incalzire/racire;o Pasteurizare;o Sterilizare.
o Lactate;o Bere;o Sucuri de fructe;o S.a.m.d.
APLICATIIAPLICATII
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SCHIMBATOARE SCHIMBATOARE DE CALDURA DE CALDURA
GAZ GAZ -- GAZGAZ
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DOMENII DE UTILIZAREDOMENII DE UTILIZARE
o Transferul termic intre doua mediigazoase:
- Preincalzitoare de aer in CT;- Instalatii de conditionare a aerului.
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SCHIMBATOARE DE CALDURA SCHIMBATOARE DE CALDURA CU PLACI ONDULATE INCRUCISATECU PLACI ONDULATE INCRUCISATE
Gaz cald intrare
Gaz cald iesire
Gaz rece iesire
Gaz rece intrare
Pana la 650 m2/m3
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SCHIMBATOARE DE CALDURA SCHIMBATOARE DE CALDURA CU PLACI ONDULATE INCRUCISATECU PLACI ONDULATE INCRUCISATE
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TIPURI DE NERVURITIPURI DE NERVURI
Plane
PerforateIn valuri
Intrerupte
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SCHIMBATOARE DE CALDURA SCHIMBATOARE DE CALDURA CU PLACI ONDULATE INCRUCISATECU PLACI ONDULATE INCRUCISATE
o Materiale utilizate:- Oteluri inox;- Cupru;- Nichel;- Aluminiu;o Grad mare de
compactizare:800 – 1500 m2/m3;
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Fascicul tubular
Placi
Placi nervurate
Speciale
Plamani umani
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SCHIMBATOARE DE SCHIMBATOARE DE CALDURA DE CALDURA DE
CONSTRUCTIE CONSTRUCTIE SPECIALA SI MIXTESPECIALA SI MIXTE
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SCHIMBATOARE DE SCHIMBATOARE DE CALDURACALDURA
CU TUBURI TERMICECU TUBURI TERMICE
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SCHIMBATOARE DE CALDURA SCHIMBATOARE DE CALDURA CU TUBURI TERMICECU TUBURI TERMICE
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TUBURI TERMICETUBURI TERMICEo Incinta etansa (tub)
care contine un lichidaflat in echilibru cu vaporii sai;
o 1942 Gangler, USA;o 1964 Grover, Cotter &
Erickson;o λ cu 2 sau 3 ordine de
marime mai mare decat a metalului.TUB TERMIC GRAVITATIONAL (TERMOSIFON)
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TUB TERMIC CU UMPLUTURATUB TERMIC CU UMPLUTURA
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ALEGEREA FLUIDULUI DE LUCRUALEGEREA FLUIDULUI DE LUCRU
FLUIDULFLUIDULDEDE
LUCRULUCRU
sudabilitatepuritate
toxicitate
compatibilitatecu tubul
stabilitate latemperatura
flux critic
proprietatitermodinamice
cost
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MATERIALE UTILIZATEMATERIALE UTILIZATE
Wolfram, molibdenLitiuOtel inox 316, nichel, molibdenSodiu
Otel inox 316, nichelPotasiuOtel low C, otel inoxMercur
Otel, otel inoxDowtherm AOtel, otel inoxToluen
CupruApaCupruMetanol, etanolCupruAcetona
Aluminiu, cupruFreonAluminiu, otel inoxAmoniac
Materialul tubuluiFluidul de lucru
Joasa temperatura:-20 … +60 °C
Medie temperatura:60 … 250 °C
Inalta temperatura:250 … 400 °C
Foarte inaltatemperatura:
> 400 °C
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AVANTAJE ALE SCHIMBATOARELOR AVANTAJE ALE SCHIMBATOARELOR DE CALDURA CU TUBURI TERMICEDE CALDURA CU TUBURI TERMICE
o ETANSEITATE foarte buna intre celedoua fluide;
o FIABILITATE ridicata a schimbatorului;o Comportare foarte buna la DILATARE;o SUPLETE IN CONCEPTIE – tuburile sunt
independente;o EFICIENTA ridicata – valori α mari;o PIERDERI DE PRESIUNE reduse.
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APLICATII ALE SCHIMBATOARELOR APLICATII ALE SCHIMBATOARELOR DE CALDURA CU TUBURI TERMICEDE CALDURA CU TUBURI TERMICE
o RECUPERAREA CALDURII – preincalzireacu gaze de ardere a aerului la cuptoareleindustriale;
o INSTALATII DE CLIMATIZARE;o INDUSTRIA CHIMICA;o ENERGETICA NUCLEARA.
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SCHIMBATOARE DE SCHIMBATOARE DE CALDURACALDURA
CU PLACI IN MANTACU PLACI IN MANTA
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SCHIMBATOARE DE CALDURA SCHIMBATOARE DE CALDURA CU PLACI IN MANTA (LAMELARE)CU PLACI IN MANTA (LAMELARE)
o D = 200 ÷ 1000 mm;o A = 0,5 ÷ 500 m2;o T = -200 ÷ 600 °C;o P = max. 4 MPa.
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SCHIMBATOARE DE SCHIMBATOARE DE CALDURA CU PLACI IN CALDURA CU PLACI IN MANTA (LAMELARE)MANTA (LAMELARE)
o Mai scumpe decatSCP cu garnituri;
o Intervalul de lucru(P,T) mai mare decat al SCP;
o Alternativa la SCFT confectionate din alte materiale decatOL;
o Posibilitati limitatede curatire.
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SCHIMBATOARE DE SCHIMBATOARE DE CALDURACALDURA
CU SUPRAFETE RACLATECU SUPRAFETE RACLATE
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU SUPRAFATA RACLATACU SUPRAFATA RACLATA
o Scraped Surface Heat Exchangers (SSHE)
produs
agent termic ax rotativ
lamele racloare
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU SUPRAFATA RACLATACU SUPRAFATA RACLATA
o Tipuri de raclete:Cutite concentricesuspendate
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU SUPRAFATA RACLATACU SUPRAFATA RACLATA
o Tipuri de raclete:Cutite concentricefixe
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU SUPRAFATA RACLATACU SUPRAFATA RACLATA
o Tipuri de raclete:Cutite excentricesuspendate
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU SUPRAFATA RACLATACU SUPRAFATA RACLATA
o Tipuri de raclete:Cutite suspendatein teava de forma avala
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU SUPRAFATA RACLATACU SUPRAFATA RACLATA
o Tipuri de raclete:Cutite concentriceflexibile
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU SUPRAFATA RACLATACU SUPRAFATA RACLATA
o FLUIDE CU PARTICULE SOLIDE:
- Bucati de pui;- Peste;- Mancare pentru animale de
casa;- Budinca de orez;- Iaurturi cu fructe.
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU SUPRAFATA RACLATACU SUPRAFATA RACLATA
o FLUIDE LIPICIOASE:- Caramel;- Sosuri cu branza;- Lecitina;- Branza topita;- Amidon;- Produse zaharoase.
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU SUPRAFATA RACLATACU SUPRAFATA RACLATA
o FLUIDE VISCOASE:- Ketchup;- Maioneze;- Umpluturi din fructe;- Ciocolata;- Sosuri;- Unt de arahide;- Dressing pentru salate;- Carne dezosata mecanic (MDM);- Alimente pentru copii.
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU SUPRAFATA RACLATACU SUPRAFATA RACLATA
o FLUIDE CARE CRISTALIZEAZA:
- Extracte de ceai/cafea;- Creme de prajituri;- Concentrate de zahar;- Margarina;- Sroturi;- Topping pentru prajituri;- Glazuri;- Bere si vin.
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SCSR TIP “VOTATOR”SCSR TIP “VOTATOR”
o Suprafata de transfer termic: 0,1 – 5,5 m2;o Pentru suprafete mai mari se leaga in serie, paralel
sau mixt (serie/paralel) mai multe aparate identice;o Coeficienti de transfer K = 3000 ÷ 6500 W.m-2.K-1.
Agent termic
Produs Raclete
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SCSR TIP “VOTATOR”SCSR TIP “VOTATOR”
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SCSR TIP “CHERYSCSR TIP “CHERY--BURRELL”BURRELL”
o Spirala pentru dirijarea fluxului de agent termic;o Agent termic;o Produs;o Rotor cu raclete.
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SCSR TIP “CONTHERM”SCSR TIP “CONTHERM”
Incalzitor CONTHERM pentru procesarea termica
a pestelui
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SCSR TIP “CONTHERM”SCSR TIP “CONTHERM”
Linie tipica pentru FIERBERE - RACIRE
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SCSR TIP “CONTHERM”SCSR TIP “CONTHERM”
Linie pentru prelucrarea termicaa legumelor si fructelor
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SCSR TIP “CONTHERM”SCSR TIP “CONTHERM”
Linie pentru prelucrarea aseptica
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SCSR TIP “CONTHERM”SCSR TIP “CONTHERM”
Linie pentru prelucrarea caramelului
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SCSR TIP “CONTHERM”SCSR TIP “CONTHERM”
Linie pentru racirea carnii dezosate mecanic (MDM)
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SCSR TIP “CONTHERM”SCSR TIP “CONTHERM”
Linie pentru fabricarea continua a budincii de orez
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SCSR TIP “CONTHERM”SCSR TIP “CONTHERM”
Linie pentru prelucrarea pestelui
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DIMENSIONAREA SCHIMBATOARELOR DIMENSIONAREA SCHIMBATOARELOR DE CALDURA CU SUPRAFATA RACLATADE CALDURA CU SUPRAFATA RACLATA
dax di Di
Z
nL
Di – diametrul interior al spatiului agentului termic;di – diametrul interior al spatiului fluidului procesat;
dax– diametrul axului rotorului;n – turatia axului rotorului;L – lungimea axului rotorului;Z – numarul de raclete;
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DIMENSIONAREA SCHIMBATOARELOR DIMENSIONAREA SCHIMBATOARELOR DE CALDURA CU SUPRAFATA RACLATADE CALDURA CU SUPRAFATA RACLATA
o DATE CUNOSCUTE:- Debitul de fluid procesat si natura acestuia;- Temperaturile de intrare-iesire ale fluidului
procesat;- Temperaturile de intrare-iesire ale agentului
termic;- Caracteristicile unui element de SCSR: di; Di; dax;
L; n; Z.
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DIMENSIONAREA SCHIMBATOARELOR DIMENSIONAREA SCHIMBATOARELOR DE CALDURA CU SUPRAFATA RACLATADE CALDURA CU SUPRAFATA RACLATA
o NECUNOSCUTE DE DETERMINAT:- Debitul necesar de agent termic, MAT;- Numarul elementelor de SCSR, nE;- Puterea consumata, P.
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DIMENSIONAREA SCHIMBATOARELOR DIMENSIONAREA SCHIMBATOARELOR DE CALDURA CU SUPRAFATA RACLATADE CALDURA CU SUPRAFATA RACLATA
DATEINITIALE
Determinare proprietati fluidde proces la T sa medie
Determinare proprietati agenttermic la T sa medie
Determinare DEBIT agenttermic (din Bilant Termic)
Determinare Q necesar(din Bilant Termic)
Calcul α fluid de proces(ec. criteriale)
Calcul α agent termic(ec. criteriale)
Calcul coeficient globalde transfer termic, K
Calcul ∆Tmediu (contracurent)
Calcul arie necesara, A din:Q = K x A x ∆Tmediu
Calcul numar elemente SCSR
Calcul consum de putere
END
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DIMENSIONAREA SCHIMBATOARELOR DIMENSIONAREA SCHIMBATOARELOR DE CALDURA CU SUPRAFATA RACLATADE CALDURA CU SUPRAFATA RACLATA
o Calculul coeficientului individual de transfer termic al fluidului de proces, α1:
o a = 0,014 ; b = 0,96 – lichide viscoase;o a = 0,039 ; b = 0,70 – lichide neviscoase.
In literatura exista si alte ec. criteriale de corelare pt. α.
( ) 53,055,0
i
ax62,0
i0,1
axi
bpi1 Z
dd
vndvddc
adNu ⋅⎟⎟⎠
⎞⎜⎜⎝
⎛⋅⎟
⎠⎞
⎜⎝⎛ ⋅⋅⎟⎟
⎠
⎞⎜⎜⎝
⎛μ
ρ⋅⋅−⋅⎟⎟
⎠
⎞⎜⎜⎝
⎛λ
μ⋅⋅=
λ⋅α
=
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DIMENSIONAREA SCHIMBATOARELOR DIMENSIONAREA SCHIMBATOARELOR DE CALDURA CU SUPRAFATA RACLATADE CALDURA CU SUPRAFATA RACLATA
o Coeficientul global de transfer termic, K:
o Numarul de elemente de SCSR:
o Consumul de putere:
⎥⎦⎤
⎢⎣⎡
⋅α
++⋅λδ
+⋅α
=Km
W 1R
dd
dd1
1K 2
2depuneri
m
e
perete
perete
i
e
1
LdAn
eE ⋅⋅π=
[W] nDnAP CB ⋅+μ⋅⋅=
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DIMENSIONAREA SCHIMBATOARELOR DIMENSIONAREA SCHIMBATOARELOR DE CALDURA CU SUPRAFATA RACLATADE CALDURA CU SUPRAFATA RACLATA
99,211,271,73104,579,601,002,0039,3140,410,681,7953,4043,960,662,0029,0534,880,611,9334,44
DCBA
[W] nDnAP CB ⋅+μ⋅⋅=
Valorile coeficientilor A ÷ D din ecuatia puterii(datele mai multor autori)
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SCHIMBATOARE DE SCHIMBATOARE DE CALDURA MULTITUBULARECALDURA MULTITUBULARE
COMBINATE CU SERPENTINACOMBINATE CU SERPENTINA
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APLICATII & SCOPAPLICATII & SCOP
o Instalatiile de rectificare din industria spirtului;o Pot utiliza 2 agenti termici pt. racirea vaporilor
in condensare (DEFLEGMATOR);o Pot realiza procesul in doua etape:I - condensarea vaporilorII – racirea vaporilor
(CONDENSATOR).
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TIPURI CONSTRUCTIVETIPURI CONSTRUCTIVE
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURACU SERPENTINA ROTATIVACU SERPENTINA ROTATIVA
SI MANTASI MANTA
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UTILIZARIUTILIZARI
o Preincalzirea aproape instantanee a lichidelor la o anumita temperatura(80 – 90 °C) si mentinerea lor la aceastatemperatura (3 – 6 min) pentru:
- Oprirea actiunilor enzimatice;- Solubilizarea anumitor componenti;o Agentul termic: abur 0,2 – 0,3 MPa.
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PRINCIPIUL CONSTRUCTIV SI FUNCTIONALPRINCIPIUL CONSTRUCTIV SI FUNCTIONAL
1 – cilindru; 2 – manta de incalzire; 3 – arbore inelar rotativ; 4 – spirala; 5 – alimentare produs; 6 – evacuare produs; 7 – recirculare produs; 8 – alimentare abur; 9 – evacuarecondensat.
1 2 34
6
9
85
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURATIPTIP
TRANSPORTOR ELICOIDALTRANSPORTOR ELICOIDAL
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PRINCIPIU DE FUNCTIONAREPRINCIPIU DE FUNCTIONARE
Intrare produs
Iesire produs
Motor
ReductorIntrare/iesire
agent termic
Cristalizare; Evaporare;Desublimare; Topire; Uscare;
Incalzire; Racire.
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PRINCIPIU DE FUNCTIONAREPRINCIPIU DE FUNCTIONARE
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TIPURI DE TRANSPORTOR MELCATTIPURI DE TRANSPORTOR MELCATo Pentru produse neaderente si neincrustante;o Materiale cu granule mari;o Pulberi fine;o Paste cu viscozitate medie si ridicata.
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TIPURI DE TRANSPORTOR MELCATTIPURI DE TRANSPORTOR MELCATo Pentru produse aderente si incrustante;o Pentru namoluri si suspensii concentrate;o Pentru pulberi cu granule fine.
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TIPURI DE TRANSPORTOR MELCATTIPURI DE TRANSPORTOR MELCATo Pentru produse aderente si incrustante;o Paste cu viscozitate medie spre ridicata;o Pentru materiale granulare superfine.
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TIPURI CONSTRUCTIVETIPURI CONSTRUCTIVEo Tratarea termica a intermediarilor din industria
farmaceutica;o Preevaporatoare (constructie etansa);o Cristalizatoare.
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TIPURI CONSTRUCTIVETIPURI CONSTRUCTIVEo Recomandat pentru desublimare;o Constructie etansa, prevazut si cu manta.
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SCHIMBATOARE DE CALDURASCHIMBATOARE DE CALDURAPENTRU MATERIALE SOLIDEPENTRU MATERIALE SOLIDE
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BULKFLOWBULKFLOW
o INCALZIREo RACIREo USCAREo DOZARE
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PRINCIPIU DE FUNCTIONAREPRINCIPIU DE FUNCTIONARE
Agenttermic
Produs
Pachetde placi
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DETALIU PLACIDETALIU PLACI
o Placi duble sudate laser;o Fara garnituri;o Material standard: 316L;
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MONTARE PACHET DE PLACIMONTARE PACHET DE PLACI
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SISTEMUL DE GOLIRE SOLIDESISTEMUL DE GOLIRE SOLIDE
o Descarcare prinvibrare;
o Debit uniform;o Fara pericol de
infundare.
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TAM
BUR
ROTA
TIV
STRA
T FL
UID
IZAT
TAM
BUR
ROTA
TIV
STRA
T FL
UID
IZAT
BULK
FLOW
BULK
FLOW
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APLICATIIAPLICATII
o Rasini si maseplastice;
o Chimicale;o Ingrasaminte;o Nisip si minerale;o Cosmetice;o Detergenti;o Produse alimentare:
o Praf de ciocolata;o Nuci sfaramate;o Nuci intregi;o Tablete de sare;o Cristale de zahar;o Seminte si graunte;o Sare de bucatarie.
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ALEGEREA TIPULUI DEALEGEREA TIPULUI DESCHIMBATOR DE CALDURASCHIMBATOR DE CALDURA
o Trebuie asigurat Regimul Termic Optim:Se satisfac toate cerintele procesului tehnologicConsumul energetic este minim
o Factori de influenta:- Fluxul termic schimbat;- Conditiile de temperatura ale transferului termic;- Rezistenta hidraulica a aparatului;- Materialul de constructie + protectia anticoroziva;- Posibilitati de indepartare a depunerilor;- Posibilitati de spalare, sterilizare, dezinfectare
(CIP, SIP).
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ALEGEREA TIPULUI DEALEGEREA TIPULUI DESCHIMBATOR DE CALDURASCHIMBATOR DE CALDURA
o SC multitubulare cu mai multe treceri:- Transfer termic vapori – lichid;- Flux termic transferat foarte mare;- Transfer termic L-L sau G-G.
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ALEGEREA TIPULUI DEALEGEREA TIPULUI DESCHIMBATOR DE CALDURASCHIMBATOR DE CALDURA
o SC cu suprafete extinse:- Transfer termic intre:
vapori in condensare – gaz;- Transfer termic lichid – gaz,
cand αlichid >> αgaz ;
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ALEGEREA TIPULUI DEALEGEREA TIPULUI DESCHIMBATOR DE CALDURASCHIMBATOR DE CALDURA
o SC cu manta, SC cu serpentina:- Fluxuri tehnologice reduse;- Transferul termic reprezinta un scop secundar;- Procesul decurge discontinuu.
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ALEGEREA TIPULUI DEALEGEREA TIPULUI DESCHIMBATOR DE CALDURASCHIMBATOR DE CALDURA
o SC cu tevi coaxiale (teava in teava):- Debite mici de flux termic;- La fluxuri termice mari:
- mai multe elemente inseriate;- tevi ondulate sau nervurate.
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ALEGEREA TIPULUI DEALEGEREA TIPULUI DESCHIMBATOR DE CALDURASCHIMBATOR DE CALDURA
o SC spirale:- Fluxuri termice mari;- Cand sunt necesare unitati
compacte;- Cand P fluidelor nu sunt prea
mari.
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ALEGEREA TIPULUI DEALEGEREA TIPULUI DESCHIMBATOR DE CALDURASCHIMBATOR DE CALDURA
o SC cu placi:- Sunt necesare unitati foarte compacte;- Gradul de recuperare a caldurii trebuie
sa fie ridicat;- Sunt necesare conditii speciale de igiena;- Suprafata de transfer trebuie
modificata frecvent;- P si T fluidelor nu sunt prea mari.
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ALEGEREA TIPULUI DEALEGEREA TIPULUI DESCHIMBATOR DE CALDURASCHIMBATOR DE CALDURA
o SC cu suprafete raclate:- Fluidele prelucrate sunt foarte
viscoase, aderente, cu particulesolide sau fibre in suspensie, usortermodegradabile.