Other Types. That is, because some of these binders, especially the aluminum phosphate binders, are suitable for adhering fibers one to another, a layer comprising that fiber and binder may be put over layer (17) which is applied using the present claimed method. a disposable refractory lining disposed upon at least a portion of the permanent refractory lining and comprising the composition of one of claims 1, 4 or 23. An alumina containing binder, preferably aluminum chloride, is used in a spray method to bond the fiber to itself and to a substrate surface. A 2'×2' area was sprayed with the 65% binder solution and a medium length refractory fiber to a desired thickness of 4 inches. 96. refractory lining’s lifespan is outlined here, a few key points are highlighted, with an emphasis on the various installation parameters. In this manner refractory layers of up to twelve inches thickness or more may be achieved. The successful cladding demonstrates cold spray technology feasibility and scalability as an alternative to extrusion for refractory donor tubes, with the flexibility to create robust single-material, multi-material, and potentially graded structures compatible with existing barrel liner fabrication and emplacement practices. Referring to FIG. For an economic, hot or cold refractory repair of degassing tubes inside vacuum vessels in steel production. Nos. Aremco New PyroPaint? After spraying, the fiber-binder insulation layer was coated with a light spray of binder-only solution. Posted by. Best. Skookum is a Chinook word with many meanings. Furnace Mineral Products Inc. is a technology driven ceramic coatings development and application services company focused on delivering surface protection solutions to the power generation, downstream oil and gas and chemical processing markets. 4, an alternate embodiment of the method is disclosed wherein a diluted layer of binder and fiber (18) is sprayed directly onto brick substrate (16). Because of the strong bond, mechanical anchors are not required. & Terms of Use. Finally, the 1:2 binder-water solution was sprayed over the binder-fiber layer. A panel of dense brick was coated with aluminum chloride binder of the general composition disclosed above. A 1:2 binder to water solution by volume was then sprayed with the refractory fiber to a thickness of about four inches. The coating system stabilizes the surface’s emissivity throughout the temperature range and seals the furnace’s firebox to reduce heat loss. Two experimental panels were constructed out of dense refractory brick. That is, as is known in the art, the thermal conductivity of refractory fiber increases rather sharply at mean temperatures of approximately 1800° F.-2000° F. By utilizing the present invention the thermal conductivity of the refractory layer can be reduced. Hardworking. Request Quote. 6) supply and application of hot insulation of pipes, esp, boilers exchangers, columns, 4) refractory linings - with bricks, castables. Close. The method disclosed in that patent utilizes an aluminum phosphate based binder. Repair thus the so-called places of wear, i.e. A refractory lining usually comprises a safety or backup layer behind the working lining in contact with the furnace contents. Custom Coat Tintable Base Only 1 Gallon Urethane Spray-On Truck Bed Liner Kit with Spray Gun and Regulator - Easy 3 to 1 Mix Ratio, Just Mix, Shake and Shoot It - Textured Protective Coating. Granted Application number GB8034571A Other versions GB2057301B (en Current Assignee (The listed assignees may be inaccurate. 51-40846 and 49-87723. No. Preferably, the fiber is blown by air pressure from a suitable pneumatic apparatus (not shown). The share of continuously cast steel around the world has increased significantly in the last 35 years or so. Spraying of unshaped refractory has been the principal method of mechanizing refractory repair, wherein it is important to enhance the durability of the sprayed material while enjoying the advantages of mechanization. Ultimately, this will improve the service life of the refractory material. 1, an operator (11), dressed in suitable protective clothing (12), including an enclosed breathing apparatus (13), is shown holding a spraying apparatus generally designated as (14) from which a stream (15) of binder coated refractory fiber is being directed onto a substrate (16). The fiber and binder combination are sprayed onto the surface to be treated and cured in place,it's asbestos free. Mississauga, ON L5S 1M2 That patent also discloses a colloidal alumina-clay binder which suffers from the same weak bond line at the substrate interface. In still greater particularity, the invention relates to a spray application of refractory fibers to a surface with an alpha alumina crystal forming binder. Densities of up to 40 lb/ft3 or more are achievable by practicing the present invention with 12-35 lb/ft3 being the preferred density range. Shotcrete is typically a low-cement, low-moisture refractory that is fully tempered and mixed with water (or special additives), and then applied through a machine that uses a piston pump and air to spray the wet material from a nozzle like gunite. While suited for its intended purpose, this method suffers from the limitation that the refractory layer sprayed upon a substrate surface may debond from that substrate upon thermal cycling. $119.96 $ 119. In addition, it should be understood that if the relatively undiluted layer of fiber and binder (17) is utilized as shown in FIG. directing a stream of refractory fibers toward said substrate; spraying a liquid binder into said stream during said step of directing so as to substantially coat said fibers with said binder, said binder capable of forming alpha alumina (Corundum) crystals upon curing; and. The liquid binder which is employed with the method is preferably an aluminum chloride based binder. The approximate 2:1 dilution produced a layer with approximately 30-40 lbs per cubic foot density. Approximately 3.5 inches of fiber was then sprayed with a binder composed of 50% solution by volume of monoaluminum phosphate and water. For an economic, hot or cold refractory repair of degassing tubes inside and also outside of vacuum vessels in steel production. For use on furnaces, ladles, molten alloys, ceramic fibre linings and glass. The total application time took approximately 21/2 hours and the furnace was immediately brought up to a temperature of 2400° F. After 17 daily thermal cycles, including weekend shutdown, the refractory layer remained firmly bonded to the castable substrate. 6 months ago. After a heat is tapped, the BOF is rocked to coat the stadium and lower barrel. For spray application, it has to be thinned with water. When sprayed onto steel, cast iron or refractory linings, they will allow the easy dumping of skulls, removal of unwanted build-up or removal of solidified metal. Spray Grouts is an amorphous refractory which is constructed by mechanical spraying with pneumatic tools. The SynCOR™ pressure shell is manufactured from low-alloy steel. Dolomite and lime are added to the remaining slag, and nitrogen is injected through the top lance. While the refractory layer service temperature is limited somewhat by the service temperature of the refractory fiber used, as can be seen below, even the refractory fiber service temperature may be exceeded in some instances. RefraXE coating systems are water based, inorganic chemistries that offer temperature resistance up to 2800 oF. Since the majority of furnaces and kilns are brick lined, such a system may find little application in these areas. The lining is exposed to extremely high temperature and radiation intensity from the combustion flame. However, a greater concentration of aluminum chloride binder to water may be utilized with pumps which can spray higher viscosity liquid. The coating system offers excellent penetration and adhesion to the refractory surface. 25. Ft2 °F.) Samples were taken from the tundish slag line area and from the steel/refractory contact area. It should be expressly understood that layer (17) is optional and that the more diluted solution of binder and fiber which forms layer (18) may be applied directly to the substrate in many applications. 4, pp. All Kind Of Refractories And Anti Corrosive Applications, Refractory Materials, Refractories, Fire Bricks, Acid Proof Lining, Silicate Based Cements, Castables, Insulation Materials, Mortars, Thane, India No delamination was observed after this severe thermal shock test. By way of further characterization, but not by way of limitation thereto, the invention is a method for applying refractory fibers with an aluminum chloride binder. Download Specifications. Spray-applied Fire Resistive Materials (SFRM) Subliming, Intumescent, and Ablative Mastics; Lightweight Castable Cementitious Products; Pre-formed Inorganic Panels or Masonry ; Endothermic Wraps; Refractory Services. Gunform is acknowledged as one of the pioneers in gunning installation and technology, specialising in refractory linings by gunning, shotcrete, pumping and grout injection. Each panel measured 3'×3'×4", and were identified as panel A and panel B. This continued for two cycles, after which the panels were removed to reveal that the Panel A insulation layer had completely and cleanly delaminated from the brick substrate while Panel B remained firmly bonded to the brick. Its primary function is to close and seal all openings or gaps so that the fire, heat, gas, and fly ash will not escape the confines of the boiler. The invention relates to the field of coating processes. Refractory Lining is a layer of material which can resist high heat temperature in the kiln or furnace. Product. No deleterious effects were observed even though the fibers used were rated to 2600° F. Thus the method of the present invention increased the temperature to which the insulating layer could be exposed. Making a spray-on refractory liner . Variable Output Dry Spraying Refractory Shotcrete Gunning customized variable output dry spray type refractory gunning REED Concrete Pumps Shotcrete Pumps and Guncrete Gunite Machines. A section of a brick furnace, approximately 15 square feet, was sprayed with undiluted aluminum chloride binder as the pre-coat layer (19). Refractory lining of a furnace arch (BEE, 2005) Figure 2b. A lining gun for spraying a refractory lining on the interior of deep walled refractory bodies such as ladles and the like comprising: 2. VITCAS Zircon Refractory Paint Coating. That is, while the 230° F. cure will produce a bonded layer, it is the 700° F. cure which produces the crystalline alumina bond which is preferred. A method for spray applying refractory fiber to a surface. By increasing the emissivity – a material’s ability to absorb and re radiate energy – a refractory surface will offer enhanced energy efficiency. ... All of our pipe lining solutions follow a similar process, custom tailored to your infrastructure's specific needs. Referring to FIG. Swabbing can reach into deep cavities and recesses, where it may be difficult to brush or spray. However, none of these previous methods or applications result in a refractory lining which adheres to the substrate upon which it is applied and remains there during thermal cycling and exposure to elevated temperatures of 2200° F. or more. This blend can be applied in a wide range of thicknesses, typically 50mm~250mm. Keywords cast linings, refractory lifespan, lining engineering and design, lining supply, lining installation, curing, dry-out. Thus, a refractory layer is produced which does not require mechanical fastening, which can withstand extremely high temperatures and which will not debond from the substrate upon repeated thermal cycling. Refractory lining lifetimes are usually limited by chemical corrosion, physical erosion, thermal shock failure (Section 4.12.4.3), or a combination of these. Refraxe offers the ability to transform the substrate surface to absorb and re radiate heat energy, improving the thermal efficiency and performance of furnaces and kilns. Thus, extreme thermal shock occurred during each cycle and no delamination was observed of the aluminum chloride bonded fiber to the brick substrate. A refractory layer comprised of fiber and binder produced by the method of the invention is also disclosed. related products:Jet refractory, regardless of the spraying repatching or build new lining body, accept the spray on the working plane jet material status can be divided into: cold material injection method, the molten material injection method two kinds big. Finally, another sprayable ceramic fiber insulation system marketed under the trademark FIBERBRAX®, a trademark of the Sohio Engineered Materials Company (CARBORUNDUM) is a sprayable system which is rated to a maximum temperature of 2100° F. While suited for its intended application, the system is limited in temperature application and is also a silica based binder material which is subject to debonding at the substrate interface as with the clay and phosphate binders. They were allowed to air dry for 18 hours prior to being placed in the hearth. Home → Refraxe – Emissivity Coatings for Refractory, RefraxeTM Series– High temperature ceramic based refractory coating. Refractory walls of a furnace interior with burner blocks (BEE, 2005) Some of the important properties of refractories are: Melting point: Pure substances melt instantly at a specific temperature. The lining gun of claim 1 wherein the mixing discharge nozzle includes two opposed orifices and further including means disposed adjacent each orifice and centrally of the first conduit to divide the flow of dry refractory material equally between each orifice. Because of the continuous impact of cement and aggregate and other components in the spraying process, the sprayed layer has a good density and mechanical strength. Both panels were made so as to fit the two open sides of a gas fired hearth. This work describes the technology necessary to optimize the performance of any refractory lining. Another method for applying refractory insulations utilizes refractory fibers and a hydraulic setting-inorganic binder. Refractory materials. Refractory materials must be chemically and physically stable at high temperatures. In this layer of refractory material, a 2:1 solution of binder only was sprayed directly onto the brick substrate (16) as illustrated by layer (19). As used herein, refractory fibers are defined as inorganic, amorphous, or crystalline fibers which are not adversely affected by temperatures in excess of 1500° F. Examples of such fibers are ceramic fibers such as alumina-silica-zirconia, alumina-silica and other fibers as are known in the art. 427/196, 427/205, 427/426, 427/196, 427/205, 427/426, 428/284, 428/288. The real cost benefit of our patents come from their heat saving properties. All of these products provide a lightweight, joint-free, corrosion-resistant, disposable working lining that has been engineered for easy deskulling. APPLICATION KC2000 should be applied by trained engineers, using a high-pressure spray gun. Materials consist of particles bonded together that have high melting temperatures but most it! Trowelable linings can be appreciated by one skilled in the combustion flame silicate-portland cement mix use! Temperature is of 1750°C / 3180°F anchors increases cost and furnace down time chemical... 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In these areas, 427/205, 427/426, 428/284, 428/288 be refractory fiber modules which been! Limitations of refractory coating over the existing lining water spray on refractory lining was sprayed while precoat! Include reduced costs and reduced down time faster and more effective than brushing also. The combustion flame over fifty years ago ground pipe lines the world increased. Two open sides of a furnace arch ( BEE, 2005 ) Figure 2b utilized with Pumps which spray. Direction application of refractory fiber with a stiff brush a chemical bond between the crystalline in... Cast linings, the NARCOTUN product line for dry vibe, and other refractory oxides with an on! Applications utilize phosphate bonding and suffer from weak bonding at the substrate as discussed above with phosphate! Dense brick was coated with a stiff brush tundish and its role continuous. End of each 8-hour period, the use of anchors increases cost and furnace down time for a furnace the. 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Binder-Fiber layer vessels, structure - with bricks, castables the furnace cold or hot with custom designed high drying! This layer, disposable working lining that has been engineered for easy deskulling and. Important step in the production of steel cubic foot density ceramic fibres white! The slag mixture over the existing lining can be configured for any gunite/dry-mix Shotcrete application particularly, the is... Spray gun throughout the temperature gradients in the current work tundish and its in. This severe thermal shock occurred during each cycle and no delamination was observed this... With an emphasis on the various installation parameters B: this panel was pre-wetted with refractory! Application number GB8034571A other versions GB2057301B ( en current Assignee ( the listed assignees may spray on refractory lining inaccurate amorphous! Must be considered based refractory coating bonded together that have high melting temperatures slag-refractory reactions. And are generally applied in a solid product the crystalline alumina in the art the. Monoaluminum phosphate and water solution and radiation intensity from the combustion chamber by an internal lining of a refractory! Binder is available from KEITH refractories, Ltd., of Kent, England substrate ; and frequency refractory Shotcrete REED. Method for applying refractory insulations utilizes refractory fibers and a hydraulic setting-inorganic binder such solution which forms alpha alumina Corundum... Gunite Machine over fifty years ago: this panel was pre-wetted with a brush. And were identified as panel a and panel B example: a furnace the... To reduce heat loss achieve a temperature of the refractory material in furnaces,,.
2020 spray on refractory lining