1. Corrosion Resistance
FGD nozzlesua haujlwm nyob rau hauv ib puag ncig corrosive heev uas muaj sulfur oxides, chlorides, thiab lwm yam tshuaj lom neeg. Silicon carbide (SiC) ceramic qhia tshwj xeeb corrosion kuj nrog tsawg dua 0.1% huab hwm coj poob hauv pH 1-14 kev daws teeb meem (raws li ASTM C863 kuaj). Piv rau stainless hlau (PREN 18-25) thiab npib tsib xee alloys (PREN 30-40), SiC tswj kev ncaj ncees yam tsis muaj pitting los yog kev nyuaj siab corrosion cracking txawm nyob rau hauv concentrated acids ntawm siab kub.
2. Kev kub siab ruaj khov
Kev khiav hauj lwm kub nyob rau hauv ntub flue roj desulfurization systems feem ntau yog 60-80 ° C nrog spikes tshaj 120 ° C. SiC ceramics khaws 85% ntawm nws chav-kub lub zog ntawm 1400 ° C, ua tau zoo tshaj alumina ceramics (poob 50% lub zog los ntawm 1000 ° C) thiab cov hlau tsis muaj cua sov. Nws thermal conductivity (120 W / m·K) ua kom muaj cua sov kom zoo, tiv thaiv kev ntxhov siab thermal.
3. Hnav tsis kam
Nrog rau Vickers hardness ntawm 28 GPa thiab tawg toughness ntawm 4.6 MPa·m¹/², SiC nthuav tawm superior erosion tiv thaiv ya tshauv particles (Mohs 5-7). Kev ntsuam xyuas teb qhia SiC nozzles tuav <5% hnav tom qab 20,000 teev kev pabcuam, piv rau 30-40% hnav hauv alumina nozzles thiab ua tiav cov hlau tsis muaj polymer-coated hauv 8,000 teev.
4. Cov yam ntxwv ntws
Qhov tsis-wetting nto ntawm cov tshuaj tiv thaiv-bonded SiC (lub kaum sab xis> 100 °) ua kom meej slurry dispersion nrog CV qhov tseem ceeb <5%. Nws lub ntsej muag du (Ra 0.2-0.4μm) txo qhov kev poob siab los ntawm 15-20% piv rau cov hlau nozzles, thaum tuav ruaj khov coefficients (± 1%) ua haujlwm ntev.
5. Kev tu yooj yim
SiC's chemical inertness tso cai rau cov txheej txheem ntxuav nruj xws li:
- Lub dav hlau dej siab siab (txog 250 bar)
- Ultrasonic tu nrog alkaline daws
- Ua kom tsis muaj menyuam ntawm 150 ° C
Tsis muaj kev pheej hmoo ntawm degradation deg feem ntau nyob rau hauv polymer-lined los yog coated hlau nozzles.
6. Lub neej kev khwv nyiaj txiag
Thaum cov nqi pib rau SiC nozzles yog 2-3 × siab dua tus qauv 316L stainless hlau, lawv 8-10 xyoo kev pab cuam lub neej (vs 2-3 xyoo rau hlau) txo cov zaus hloov los ntawm 70%. Tag nrho cov nqi ua tswv cuab qhia 40-60% kev txuag nyiaj ntau dua 10 xyoo, nrog xoom downtime rau kev kho hauv tsev.
7. Environmental Compatibility
SiC qhia txog kev ua haujlwm tsis sib xws hauv cov xwm txheej hnyav:
- Ntsev tshuaj tiv thaiv: 0% huab hwm coj hloov tom qab 5000hr ASTM B117 kuaj
- Acid dew taw tes ua haujlwm: Withstands 160 ° C H2SO4 vapors
- Thermal shock resistance: Muaj sia nyob 1000 ° C → 25 ° C quench cycles
8. Anti-scaling Properties
Covalent atomic qauv ntawm SiC tsim ib qhov chaw uas tsis yog-reactive nrog scaling tus nqi 80% qis dua hlau lwm. Cov kev tshawb fawb Crystallographic qhia tias calcite thiab gypsum deposits tsim cov nyiaj tsis muaj zog (adhesion <1 MPa) ntawm SiC piv rau> 5 MPa ntawm cov hlau, ua kom yooj yim tshem tawm cov tshuab.
Technical Conclusion
Silicon carbide ceramic tshwm sim raws li cov khoom siv zoo xaiv rau FGD nozzles los ntawm kev ntsuas kev ua tau zoo:
- 10 × lub neej ua haujlwm ntev dua li cov khoom siv hlau
- 92% txo qis hauv kev kho tsis tau npaj tseg
- 35% kev txhim kho hauv SO2 tshem tawm efficiency los ntawm cov qauv tshuaj tsuag zoo ib yam
- Tag nrho ua raws li EPA 40 CFR Tshooj 63 emissions qauv
Nrog rau kev txhim kho kev tsim khoom xws li kua-theem sintering thiab CVD txheej, tiam tom ntej SiC nozzles tau ua tiav sub-micron nto tiav thiab nyuaj geometries yav dhau los tsis tuaj yeem ua tiav hauv ceramics. Qhov kev hloov kho thev naus laus zis no ua haujlwm ntawm silicon carbide ua cov khoom siv rau kev siv lub tshuab hluav taws xob tom ntej.
Post lub sij hawm: Mar-20-2025