Seawater Cooling Systems fabrication khoom

Kev xeb ntawm cov hlau hauv dej hiav txwv yog cov electrochemical corrosion. Vim hais tias nyob rau hauv lub seawater txias txheej txheem, cov seawater nyob rau hauv tag nrho cov kev sib cuag nrog cov huab cua, thiab yaj O2 nyob rau hauv dej hiav txwv mus txog ib tug saturated lub xeev, ua ke nrog lub inhomogeneity ntawm cov hlau nto thiab muaj zog conductivity ntawm seawater, ntau corrosive micro-batteries. yuav tsim nyob rau hauv cov hlau nto.

1. Corrosion tiv thaiv txoj cai ntawm seawater txias system

Kev xeb ntawm cov hlau hauv dej hiav txwv yog cov electrochemical corrosion. Tab sis tsis yog txhua yam hlau yuav corrode hauv dej hiav txwv, tshwj xeeb tshaj yog qee cov hlau uas tsim cov yeeb yaj kiab tiv thaiv ntawm qhov chaw. Piv txwv li, titanium tsis yooj yim rau corrode vim yog tsim cov yeeb yaj kiab tiv thaiv zoo hauv dej hiav txwv. Yog li ntawd, nws tuaj yeem raug xaiv nrog zoo corrosion kuj nyob rau hauv seawater. thiab xaiv cov hlau zoo los tiv thaiv corrosion ntawm condenser, raj thiab raj ntawv hauv seawater txias system, vim hais tias nws yog electrochemical corrosion los ntawm kev sib cuag ncaj qha ntawm hlau thiab seawater, cov hlau nto yog kho (xws li txheej los yog hauv ob sab phlu) kom cais tawm. cov hlau thiab dej hiav txwv, thiab kev txi anodes lossis ICCP yog siv los tiv thaiv corrosion ntawm seawater txias system; Yog hais tias cov hlau nto nyob rau hauv dej hiav txwv tsis huv, xws li sediment, cov hlau nyob rau hauv cov sediment yog feem ntau corrosion. Yog li ntawd, nws yog ib qho tsim nyog los ntxuav lub pob roj hmab thiab ua kom tsis huv ntawm cov hlau nto kom huv si kom tsis txhob xeb.

2. Corrosion tiv thaiv txoj kev ntawm seawater txias system

Raws li txoj cai tiv thaiv corrosion ntawm seawater txias system, txoj kev tiv thaiv corrosion ntawm seawater txias system yog xaiv cov khoom zoo. Lub seawater txias condenser raj thiab cov ntawv raj ntawm lub hwj chim chav tsev yog tsim los ntawm titanium, thiab cov kav dej xa dej yog ua los ntawm cov yeeb nkab yas; qhov thib ob yog ua haujlwm zoo ntawm txheej txheej lossis hauv ob sab phlu, thiab lwm yam. Kev kho deg thiab kev tiv thaiv cathodic. Rau cov dej hiav txwv ncig cua txias system, kev tiv thaiv corrosion ntawm seawater ncig cua txias ntauwd thiab kev tua tua ntawm tag nrho seawater ncig cua txias system yuav tsum ua kom zoo. Tsis tas li ntawd, ntxuav lub pob roj hmab thiab ua kom cov dej txias kom huv si, tshwj xeeb tshaj yog nyob rau sab hauv ntawm lub condenser raj.

2.1. Xaiv cov khoom ntawm seawater txias system

Titanium hlau muaj lub zog tshwj xeeb thiab qhov ntom ntom. Nws muaj kev ua haujlwm zoo thiab zoo heev corrosion kuj. Nws yog tshwj xeeb tshaj yog tiv taus corrosion los ntawm seawater thiab polluted seawater. Nws muaj kev tiv thaiv zoo rau kev kub ceev dej hiav txwv yaig, uas yog qhov tshwj xeeb zoo rau cov condensers. Lub ammonia corrosion nyob rau hauv qhov khoob twj tso kua mis kuj muaj kev tiv thaiv corrosion zoo heev. Lub nyias-walled titanium welded yeeb nkab muaj cov yam ntxwv hauv qab no:

a) Qhov saum npoo ntawm cov yeeb nkab yog du thiab ci, qhov vuam seam sab hauv thiab sab nraud ntawm cov yeeb nkab yog du, thiab kev hloov pauv tsis sib xws;

b) Lub thickness ntawm cov yeeb nkab yog zoo ib yam, cov nyhuv hloov tshav kub yog qhov zoo, thiab tag nrho cov cua sov hloov kev ua tau zoo tuaj yeem ua tau ntau dua 5% siab dua li ntawm cov yeeb nkab tooj liab;

c) Lub neej ua haujlwm ntev. Lub sijhawm ua haujlwm zoo ntawm kev tsim chav tsev feem ntau yog 30 xyoo. Lub neej ntawm cov yeeb nkab titanium yog ntau tshaj 20 xyoo. Yog tias kev saib xyuas muaj zog thaum lub sijhawm ua haujlwm ib txwm muaj, chav tsev tsis tas yuav raug kaw rau kev saib xyuas tom qab kev teeb tsa thiab commissioning.

d) Tsawg modulus ntawm elasticity;

e) Tus nqi qis.

Kev xyaum ntau xyoo tau ua pov thawj tias titanium welded yeeb nkab tau dhau los ua cov yeeb nkab zoo tshaj plaws rau cov khoom siv condenser hauv cov nroj tsuag hluav taws xob raws tus dej thiab cov ntug dej hiav txwv nrog cov dej txias tsis zoo. Txawm hais tias kev nqis peev ib zaug ntawm titanium tube condenser yog qhov siab, nws muaj kev nyab xeeb, txhim khu kev qha, nyob ntev, tsis muaj kuab paug rau ib puag ncig, muaj kev khiav hauj lwm qis thiab tu nqi, thiab lav qhov zoo ntawm cov dej condensed. Kev nyiam thiab saib xyuas ntawm cov neeg ua haujlwm tswj hwm. Thaum kawg ntawm xyoo 1999, Lub Xeev Lub Tuam Txhab Hluav Taws Xob tau suav nrog cov titanium hauv tsev nrog cov qib gr1 thiab gr2 rau hauv "Cov Lus Qhia rau Kev Xaiv Cov Condenser Tubes rau Cov Hluav Taws Xob Hluav Taws Xob" thawj zaug. Tau kawg, kev xaiv cov khoom siv tiv thaiv corrosion tuaj yeem daws qhov teeb meem corrosion, tab sis feem ntau, siv nyiaj ntau dhau, yog li nws tsis tuaj yeem hloov tag nrho cov khoom siv nrog cov khoom siv hlau zoo. Feem ntau, nws tsuas yog siv rau hauv cov khoom tseem ceeb, xws li lub hnab ntim cov raj thiab cov ntawv raj ntawm lub condenser yog ua los ntawm titanium.

2.2. Ua ib txoj haujlwm zoo ntawm kev kho deg, txheej lossis hauv ob sab phlu lossis cathodic tiv thaiv.

1) Cathodic tiv thaiv tshuab suav nrog ob txoj hauv kev: kev txi anode thiab impressed tam sim no. Ob txoj kev muaj lawv tus kheej zoo thiab qhov tsis zoo. Rau cov dej hiav txwv cua txias ntawm lub tshuab fais fab, txoj kev xaiv tshwj xeeb yog feem ntau txiav txim siab los ntawm cov yam ntxwv xws li qhov loj ntawm qhov xav tau kev tiv thaiv tam sim no, muaj cov khoom siv hluav taws xob yooj yim, seb nws yuav ua rau muaj kev phom sij, thiab qhov loj ntawm cov khoom siv. qhov chaw. Feem ntau, rau cov kav dej me me, cov dej hiav txwv ntws thiab nruab nrab muaj pes tsawg leeg hloov pauv, thiab kev tiv thaiv loj dua tam sim no yuav tsum tau muab. Nws yog qhov tsim nyog siv (ICCP) txaus siab rau kev tiv thaiv cathodic tam sim no. Nyob rau hauv xyoo tas los no, seawater txias system ntawm fais fab nroj tsuag tau nce txais kev txaus siab rau kev tiv thaiv cathodic tam sim no. Tiv thaiv qhov chaw ntawm lub condenser dej tank, cov kav dej txias, cov khib nyiab khib nyiab, lub rooj vag hlau, cov dej nkag thiab qhov hluav taws xob ntawm cov twj tso kua mis, thiab cov kav dej ntws tawm nrog kev tiv thaiv zoo heev.

2) Kev tiv thaiv Cathodic yog ib txoj hauv kev zoo los tiv thaiv lossis ua kom qeeb ntawm cov khoom siv. Nws feem ntau ua ke nrog kev kho saum npoo xws li txheej los yog hauv ob sab phlu. Piv txwv li, kev tiv thaiv ntawm cov ntaub ntawv carbon steel feem ntau txais kev sib txuas ntawm cathodic tiv thaiv thiab txheej. Nyob rau hauv lub cathode kev tiv thaiv tsim thiab kev siv, kev xaiv ntawm kev tiv thaiv tam sim no ceev thiab yuav ua li cas rau kev tiv thaiv tam sim no tusyees faib yog ib qho tseem ceeb heev; Thaum kev tiv thaiv cathodic ntawm cov cuab yeej txuas nrog titanium tau ua tiav, nws yog ib qho tsim nyog los tiv thaiv hydrogen embrittlement ntawm titanium, uas yog, los tswj cov peev txheej tseem ceeb ntawm hydrogen embrittlement ntawm titanium.

2.3. Anticorrosion ntawm seawater circulating txias ntauwd

Cov dej hiav txwv circulating txias ntauwd feem ntau yog siv txheej txheej anticorrosion. Cov txheej txheej muaj cov txheej hauv qab, txheej nruab nrab thiab txheej txheej nrog cov txheej txheem sib txuam. Nyob rau hauv kev tsim kho los tiv thaiv corrosion ntawm cov yees txias, txheej txheej kho thiab pleev xim lub sij hawm yog tswj los ntawm huab cua, cov av noo, qhob toughness, ib puag ncig thiab lwm yam kev mob. Nws yog ib qho tsim nyog los tswj tag nrho lub zog ntawm kev sib raug zoo ntawm cov xim thiab cov pob zeb, thiab txhim kho cov txheej tiv thaiv rau cov pob zeb. ua si lub luag haujlwm txiav txim siab hauv kev tiv thaiv cov dej hiav txwv ultra-concentrated, kom ntseeg tau tias kev ua haujlwm nyab xeeb ntawm cov cua txias ntauwd. Vim li no, nws yog ib qho tsim nyog yuav tsum nruj me ntsis tswj lub thickness thiab uniformity ntawm txheej. Cov ntawv ntub dej ntub dej thiab cov yeeb yaj kiab qhuav tuab yuav tsum tsis tu ncua sim cov tuab thiab sib xws kom ntseeg tau tias ntau dua 85% ntawm thaj chaw ua tau raws li cov qauv tsim, kom cov txheej txheem tiv thaiv corrosion tuaj yeem ncav cuag qhov kev xav tau tsim. Txhawm rau ua kom tau raws li qhov yuav tsum tau ua ntawm kev tiv thaiv corrosion, lub tsho tiv no yuav tsum tau muab tshuaj tsuag kom zoo, tsis muaj sagging, tsis muaj pores, pinholes, tsis muaj qhov pom tseeb qhov sib txawv, tsis muaj kab nrib pleb, tsis muaj tev, thiab qhov chaw yog du, pob tshab thiab zoo nkauj.

Table 1. Cov cuab yeej tseem ceeb, cov kav dej thiab nws cov ntaub ntawv thiab kev tiv thaiv corrosion hauv Suav teb seawater txias system

1) Cov dej hiav txwv cua txias feem ntau yog tsim los ntawm cov kav dej (cov kav dej ncaj nraim, lub luj tshib, thiab qhov ntau thiab tsawg) thiab cov khoom siv (xws li condensers, heat exchangers, filters, butterfly valves, etc.). Lub seawater ncig cua txias system kuj muaj xws li ib tug txias ntauwd. Cov khoom siv ntawm cov dej hiav txwv txias yog cov pa roj carbon steel (xws li Q235A, 10CrMoAl), stainless hlau (xws li 316L, 317LN), titanium (xws li gr1 thiab gr2) thiab lwm yam.

2) Txhawm rau tiv thaiv cov dej hiav txwv txias, thawj zaug yog xaiv cov khoom siv; thib ob, ua haujlwm zoo ntawm kev kho deg thiab kev tiv thaiv cathodic xws li txheej lossis hauv ob sab phlu. Rau lub hiav txwv dej circulating cua txias system, anti-corrosion kev kho mob ntawm lub hiav txwv dej circulating cua txias ntauwd thiab tua cov kev kho mob ntawm tag nrho cov hiav txwv dej circulating txias system yuav tsum tau ua. Tsis tas li ntawd, ntxuav lub pob roj hmab thiab ua kom cov dej txias kom huv si, tshwj xeeb tshaj yog nyob rau sab hauv ntawm lub condenser raj.

Cim npe nrov: hiav txwv dej kub exchangers, cua txias system marine cav, hiav txwv txias dej system, txias seawater system