Saving Energy with Space Age High Emissivity Ceramic Coatings
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1 Texas Technology Showcase 2006 December 6, 2006 Saving Energy with Space Age High Emissivity Ceramic Coatings By Mack Hounsel, Thorpe Products Company & Marty Shelton, Eastman Chemical Company Thorpe Corporation Refractory, Engineering & Construction
2 Emisshield High Emissivity Ceramic Coatings for Refractory and Metal Furnace Components Emisshield coatings are manufactured by Wessex Inc. Emisshield is a registered trademark of Wessex Inc. Emisshield Products are covered by US Patents and Patents Pending.
3 EMISSHIELD COATINGS NASA developed these high emissivity ceramic coatings to protect the X33 Orbiter from the heat and high surface velocity encountered during reentry. This aerospace materials science has been adapted for use in the industrial sector: Core emissivity agent technology was licensed from NASA. The Center of Adhesion and Sealant Sciences at Virginia Polytechnic Institute optimized the binder system for industrial applications.
4 EMISSHIELD COATINGS Emisshield ceramic coatings: For refractory, ceramic, and metal substrates Rated to 3500 F Non-toxic water based materials Become fully ceramic above 1500 F Excellent reliability and longevity Rapid payback Technology: Unique binder system Patented emissivity agents Nanotechnology- small particle size
5 HIGH EMISSIVITY COATINGS What is emissivity? Ability of a material to absorb and reemit radiant energy. A black body has an emissivity of 1.0. Theoretical concept. Non-existent. A perfect reflector has an emissivity of 0.0. Theoretical concept. Non-existent. All real materials fall between 0.0 and 1.0. Coatings can increase emissivity to 0.95.
6 HIGH EMISSIVITY COATINGS The science of emissivity: Q = E H. δ. (T H4 -T C4 ) Q = Reradiated energy (BTU/hr-ft 2 ) E H = Emissivity of hotter surface δ= Stefan-Boltzmann constant T H = Temperature of hotter surface T C = Temperature of cooler surface
7 EMISSHIELD COATINGS T C < 0 F T H > 3000 F Q = E COATING. δ. (T 4 COATING T4 DEEP SPACE )
8 EMISSHIELD COATINGS Oxyacetylene flame- over 6000 F theoretical temperature
9 EMISSHIELD COATINGS E= 0.45 E= rated refractory fiber board- melts at 3100 F Q = E coating. δ. (T 4 coating T 4 ambient)
10 HIGH EMISSIVITY COATINGS Energy absorbed & reradiated Radiation Convection Heat loss Reflected Energy No coating, E= 0.5
11 HIGH EMISSIVITY COATINGS T Radiant tubes <T Reflected Less Heat Loss Absorbed &re-reradiated energy With coating, E = 0.95
12 HIGH EMISSIVITY COATINGS Potential Benefits on Refractory: Fuel savings and/or production increases of 3 to 6%. More uniform heat distribution to the coil. Less heat loss and lower external casing temperatures. Improved personnel safety. NOx Considerations: Realized fuel savings lowers fuel NOx. Lowering radiant box temperature has the potential to reduce thermal NOx. NOx reductions of 20% - 30% have been reported.
13 HIGH EMISSIVITY COATINGS Process Considerations: Radiant box temperature and flue gas crossover temperature are reduced because more available heat is transferred to the coils. Preheat and/or steam production in the convection section will be reduced accordingly.
14 EMISSHIELD COATINGS How much experience in fired heaters? Sept Over modules and IFB in ethylene cracker at Eastman Chemical. Reported energy savings of $80,000 per year. July Over modules in F-W terrace wall NH 3 reformer at Terra Industries. June Over modules and IFB in ethylene cracker at Huntsman Chemical.
15 EMISSHIELD COATINGS Continued: December Over layered blanket in reformer at Praxair. February Over modules in VCM cracking furnace at Formosa Plastics April Over modules and IFB in second ethylene cracker at Eastman Chemical. May Over modules and IFB in third ethylene cracker at Eastman Chemical.
16 EMISSHIELD COATINGS H2 Reformer New 24 x 24 Fiberlite burner blocks, coated with Emisshield ceramic coating. New Z-Blok module lining surrounding the burner blocks is not coated.
17 EMISSHIELD COATINGS Hard cast peep door covers Z-Blok ceramic fiber lining FiberliteTM Ceramic Fiber Burner Block Coating only the 24 X24 burner blocks produced a 300F lower cold face temperature than the surrounding uncoated modules.
18 EMISSHIELD COATINGS Huntsman Chemical- Installed June, 2005 New refractory lining- IFB in lower walls, Z-Blok modules in balance of radiant box. New radiant tubes. New low NOx burners. Cleaned convection section tubes. Tightened radiant box- Installed new HotSeal tube penetration seals. HiE coating installed on sidewalls only. Documented performance as of October % total fuel savings as qualified above. Estimated annual total savings- $1.47 MM
19 EMISSHIELD COATINGS Huntsman Chemical Ethylene cracking furnace Modules IFB IFB
20 EMISSHIELD COATINGS Q = Reradiated energy (BTU/hr.-ft2) δ= Stefan-Boltzmann constant
21 EMISSHIELD COATINGS Shrinkage after 3 months operation.
22 EMISSHIELD COATINGS End walls were not coated. More apparent shrinkage.
23 EMISSHIELD COATINGS
24 EMISSHIELD COATINGS Eastman- Installed April, 2006 Existing refractory lining- IFB in lower walls, Z-Blok modules in balance of radiant box. Coating installed on endwalls and sidewalls. New radiant tubes. No other changes during shutdown. Documented performance as of November % fuel savings. 9% reduction in steam production. Payback period- 10 months based on $6 /MBTU.
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