[{"data":1,"prerenderedAt":679},["ShallowReactive",2],{"site-footer-common":3,"glossary:refractory-castable-brick":45,"glossary-related:refractory-castable-brick":203},{"id":4,"extension":5,"footer":6,"meta":40,"navbar":41,"stem":43,"__hash__":44},"common\u002Fcommon.yml","yml",{"tagline":7,"links":8,"sections":9},"Acoustic cleaning intelligence for industrial fouling, soot, ash, dust and build-up.",[],[10,19,31],{"title":11,"links":12},"Product",[13,16],{"label":14,"to":15},"How it works","\u002F#product",{"label":17,"to":18},"Cost assessment","\u002F#hero",{"title":20,"links":21},"Company",[22,25,28],{"label":23,"to":24},"What we build","\u002F#about",{"label":26,"to":27},"Careers","\u002F#careers",{"label":29,"to":30},"Contact","\u002F#contact",{"title":32,"links":33},"Resources",[34,37],{"label":35,"to":36},"Blog","\u002Fresources\u002Fblog",{"label":38,"to":39},"Glossary","\u002Fglossary",{},{"links":42},[],"common","YocmZRy1AYfBbpgGVms-zhdiABlF8VTxHx6h4rDmZBA",{"id":46,"title":47,"aliases":48,"body":52,"category":182,"description":183,"extension":184,"meta":185,"navigation":186,"path":187,"relatedTerms":188,"seo":193,"sources":196,"stem":200,"term":201,"__hash__":202},"glossary\u002Fglossary\u002Frefractory-castable-brick.md","Refractory (castable \u002F brick)",[49,50,51],"refractory lining","castable refractory","refractory brick",{"type":53,"value":54,"toc":174},"minimark",[55,82,87,103,107,115,119,145,149],[56,57,58,62,63,68,69,68,73,68,77,81],"p",{},[59,60,61],"strong",{},"Refractory"," linings — castable cement-bonded mixes or pre-formed bricks — protect the steel shells of ",[64,65,67],"a",{"href":66},"\u002Fglossary\u002Fboiler","boilers",", ",[64,70,72],{"href":71},"\u002Fglossary\u002Frotary-kiln","rotary kilns",[64,74,76],{"href":75},"\u002Fglossary\u002Fcalciner","calciners",[64,78,80],{"href":79},"\u002Fglossary\u002Fwaste-heat-boiler","waste-heat boilers"," and many other industrial vessels from high-temperature gas and slag attack.",[83,84,86],"h2",{"id":85},"castable-vs-brick","Castable vs brick",[88,89,90,97],"ul",{},[91,92,93,96],"li",{},[59,94,95],{},"Castable refractory"," — mixed and poured or gunited in place, like concrete; quick installation, good for irregular shapes",[91,98,99,102],{},[59,100,101],{},"Brick refractory"," — pre-formed blocks laid in mortar; longest service life, used for the most demanding applications such as cement kiln burning zones",[83,104,106],{"id":105},"why-refractory-matters-for-sonic-horn-installation","Why refractory matters for sonic-horn installation",[56,108,109,110,114],{},"Sonic horns are mounted on the ",[111,112,113],"em",{},"steel"," shell, not on the refractory. Mounting locations must be chosen to avoid disrupting the refractory lining or creating a thermal-stress concentration. Horns mounted near refractory transitions, at kiln-shell penetrations or near burner clusters require detailed installation engineering to avoid initiating refractory failures.",[83,116,118],{"id":117},"cleaning-relevance","Cleaning relevance",[88,120,121,128],{},[91,122,123,124,127],{},"Sonic horns do ",[59,125,126],{},"not"," damage refractory — the acoustic field is non-contact",[91,129,130,131,135,136,140,141,144],{},"Aggressive ",[64,132,134],{"href":133},"\u002Fglossary\u002Fwater-cannon","water cannons"," and ",[64,137,139],{"href":138},"\u002Fglossary\u002Fexplosive-deslagging","explosive deslagging"," ",[59,142,143],{},"can"," damage refractory through thermal shock or impact",[83,146,148],{"id":147},"related-terms","Related terms",[88,150,151,157,162,168],{},[91,152,153],{},[64,154,156],{"href":155},"\u002Fglossary\u002Fhigh-alumina-refractory","High-alumina refractory",[91,158,159],{},[64,160,161],{"href":71},"Rotary kiln",[91,163,164],{},[64,165,167],{"href":166},"\u002Fglossary\u002Ffurnace","Furnace",[91,169,170],{},[64,171,173],{"href":172},"\u002Fglossary\u002Fwaterwall","Waterwall",{"title":175,"searchDepth":176,"depth":176,"links":177},"",2,[178,179,180,181],{"id":85,"depth":176,"text":86},{"id":105,"depth":176,"text":106},{"id":117,"depth":176,"text":118},{"id":147,"depth":176,"text":148},"materials-construction","Refractory linings — castable cement-bonded mixes or pre-formed bricks — protect the steel shells of boilers, rotary kilns, calciners, waste-heat boilers and many other industrial vessels from high-temperature gas and slag attack.","md",{},true,"\u002Fglossary\u002Frefractory-castable-brick",[189,190,191,192],"high-alumina-refractory","rotary-kiln","furnace","waterwall",{"title":194,"description":195},"Refractory (castable and brick) — high-temperature lining for boilers and kilns","Refractory linings — castable cement-bonded mixes and pre-formed bricks — protect the steel shells of boilers, kilns and process vessels from high-temperature gas and slag attack.",[197],{"title":198,"url":199},"Wikipedia — Refractory","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FRefractory","glossary\u002Frefractory-castable-brick","Refractory (castable and brick)","7Pka35MabIXTZ_zD4RWBbkqoJFZafcr7em2bLjPce7Y",[204,293,441,556],{"id":205,"title":156,"aliases":206,"body":209,"category":182,"description":281,"extension":184,"meta":282,"navigation":186,"path":155,"relatedTerms":283,"seo":286,"sources":289,"stem":291,"term":156,"__hash__":292},"glossary\u002Fglossary\u002Fhigh-alumina-refractory.md",[207,208],"high-alumina brick","high alumina refractory",{"type":53,"value":210,"toc":277},[211,224,228,261,263],[56,212,213,215,216,68,219,223],{},[59,214,156],{}," bricks contain 60–95% Al₂O₃ and serve in the highest-temperature zones of ",[64,217,218],{"href":71},"cement rotary kilns",[64,220,222],{"href":221},"\u002Fglossary\u002Flime-kiln","lime kilns"," and metallurgical furnaces. The high alumina content provides superior resistance to slag attack and basic-chemistry erosion compared with conventional silica-alumina refractories.",[83,225,227],{"id":226},"where-it-serves","Where it serves",[88,229,230,238,244,255],{},[91,231,232,233,237],{},"Cement kiln burning zone — direct contact with ",[64,234,236],{"href":235},"\u002Fglossary\u002Fclinker","clinker"," and combustion gas at 1,450 °C+",[91,239,240,243],{},[64,241,242],{"href":75},"Calciner"," — high-temperature, AFR-driven aggressive chemistry",[91,245,246,135,250,254],{},[64,247,249],{"href":248},"\u002Fglossary\u002Fbasic-oxygen-furnace","BOF",[64,251,253],{"href":252},"\u002Fglossary\u002Felectric-arc-furnace","EAF"," linings",[91,256,257,258,260],{},"High-temperature ",[64,259,80],{"href":79}," in metallurgical service",[83,262,148],{"id":147},[88,264,265,269,273],{},[91,266,267],{},[64,268,47],{"href":187},[91,270,271],{},[64,272,161],{"href":71},[91,274,275],{},[64,276,242],{"href":75},{"title":175,"searchDepth":176,"depth":176,"links":278},[279,280],{"id":226,"depth":176,"text":227},{"id":147,"depth":176,"text":148},"High-alumina refractory bricks contain 60–95% Al₂O₃ and serve in the highest-temperature zones of cement rotary kilns, lime kilns and metallurgical furnaces. The high alumina content provides superior resistance to slag attack and basic-chemistry erosion compared with conventional silica-alumina refractories.",{},[284,190,285],"refractory-castable-brick","calciner",{"title":287,"description":288},"High-alumina refractory — premium refractory for high-temperature kiln zones","High-alumina refractory bricks contain 60–95% Al2O3 and serve in the highest-temperature zones of cement kilns, lime kilns and metallurgical furnaces.",[290],{"title":198,"url":199},"glossary\u002Fhigh-alumina-refractory","S64nR1XGsQGqdUZwpbTI9c5ysfsl-I8pDRf4WYq31r8",{"id":294,"title":161,"aliases":295,"body":298,"category":424,"description":425,"extension":184,"meta":426,"navigation":186,"path":71,"relatedTerms":427,"seo":432,"sources":435,"stem":439,"term":161,"__hash__":440},"glossary\u002Fglossary\u002Frotary-kiln.md",[296,297],"cement kiln","rotary cement kiln",{"type":53,"value":299,"toc":418},[300,310,314,329,333,336,340,343,380,387,389],[56,301,302,303,306,307,309],{},"A ",[59,304,305],{},"rotary kiln"," is a long (typically 50–100 m), large-diameter (typically 4–6 m), gently inclined rotating steel cylinder lined with refractory brick where preheated raw meal is burned at flame temperatures of ~2,000 °C and material temperatures of ~1,450 °C to form ",[64,308,236],{"href":235},". The rotary kiln is the heart of every cement plant.",[83,311,313],{"id":312},"layout","Layout",[56,315,316,317,135,321,323,324,328],{},"The kiln is fed at its upper end by raw meal pre-calcined in the ",[64,318,320],{"href":319},"\u002Fglossary\u002Fpreheater-tower","preheater tower",[64,322,285],{"href":75},". The main burner fires at the lower (clinker discharge) end, opposing the gas flow direction. Discharged clinker falls into the ",[64,325,327],{"href":326},"\u002Fglossary\u002Fclinker-cooler","clinker cooler"," below.",[83,330,332],{"id":331},"why-kiln-stops-are-catastrophic","Why kiln stops are catastrophic",[56,334,335],{},"A cement kiln is designed for continuous operation. Stopping and restarting the kiln means cooling and re-heating massive refractory mass, which damages the lining and incurs substantial fuel cost. A typical unplanned kiln stop loses 24–72 hours of clinker production, equivalent to thousands of tonnes of lost output.",[83,337,339],{"id":338},"what-stops-the-kiln","What stops the kiln",[56,341,342],{},"Most unplanned kiln stops trace to upstream or downstream problems rather than the kiln itself:",[88,344,345,353,362,368,374],{},[91,346,347,350,351],{},[59,348,349],{},"Preheater pluggage"," — see ",[64,352,320],{"href":319},[91,354,355,361],{},[59,356,357],{},[64,358,360],{"href":359},"\u002Fglossary\u002Fkiln-inlet-ring-snowman","Kiln-inlet ring \u002F snowman"," formation",[91,363,364,367],{},[59,365,366],{},"Clinker cooler upset"," — bridging in the cooler hopper",[91,369,370,373],{},[59,371,372],{},"Calciner pluggage"," — accreted build-up from AFR firing",[91,375,376,379],{},[59,377,378],{},"ID-fan trip"," — fouled blades causing vibration",[56,381,382,386],{},[64,383,385],{"href":384},"\u002Fglossary\u002Fsonic-horn","Sonic horns"," installed across the preheater, calciner and kiln-inlet area address several of these directly.",[83,388,148],{"id":147},[88,390,391,396,401,407,412],{},[91,392,393],{},[64,394,395],{"href":235},"Clinker",[91,397,398],{},[64,399,400],{"href":326},"Clinker cooler",[91,402,403],{},[64,404,406],{"href":405},"\u002Fglossary\u002Fkiln-inlet-riser-duct","Kiln inlet \u002F riser duct",[91,408,409],{},[64,410,411],{"href":319},"Preheater tower",[91,413,414],{},[64,415,417],{"href":416},"\u002Fglossary\u002Falternative-fuel","Alternative fuel",{"title":175,"searchDepth":176,"depth":176,"links":419},[420,421,422,423],{"id":312,"depth":176,"text":313},{"id":331,"depth":176,"text":332},{"id":338,"depth":176,"text":339},{"id":147,"depth":176,"text":148},"cement","A rotary kiln is a long (typically 50–100 m), large-diameter (typically 4–6 m), gently inclined rotating steel cylinder lined with refractory brick where preheated raw meal is burned at flame temperatures of ~2,000 °C and material temperatures of ~1,450 °C to form clinker. The rotary kiln is the heart of every cement plant.",{},[236,428,429,430,431],"clinker-cooler","kiln-inlet-riser-duct","preheater-tower","alternative-fuel",{"title":433,"description":434},"Rotary kiln — the heart of the cement plant","A rotary kiln is a long inclined rotating cylinder where preheated raw meal is burned at 1,450 °C to form clinker. The heart of every cement plant.",[436],{"title":437,"url":438},"Wikipedia — Cement kiln","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FCement_kiln","glossary\u002Frotary-kiln","MIYT9G3DCofPYVl4SqD8erG8mcl6gg4VWmUXfvLV0fc",{"id":442,"title":167,"aliases":443,"body":446,"category":540,"description":541,"extension":184,"meta":542,"navigation":186,"path":166,"relatedTerms":543,"seo":546,"sources":549,"stem":553,"term":554,"__hash__":555},"glossary\u002Fglossary\u002Ffurnace.md",[444,445],"boiler furnace","combustion chamber",{"type":53,"value":447,"toc":535},[448,469,473,484,488,512,514],[56,449,450,451,453,454,458,459,463,464,468],{},"The ",[59,452,191],{}," is the radiant combustion chamber of an industrial boiler — the space where the burner flame develops, fuel combusts, and the bulk of the heat release happens. Furnace temperatures vary by fuel and design: 1,300–1,700 °C in ",[64,455,457],{"href":456},"\u002Fglossary\u002Fpc-boiler","PC boilers",", 850–900 °C in ",[64,460,462],{"href":461},"\u002Fglossary\u002Fcfb-boiler","CFB",", 900–1,100 °C in ",[64,465,467],{"href":466},"\u002Fglossary\u002Fwaste-to-energy","WtE"," grate boilers.",[83,470,472],{"id":471},"heat-transfer","Heat transfer",[56,474,475,476,478,479,483],{},"Furnace heat is absorbed almost entirely by radiation onto the ",[64,477,192],{"href":172}," tubes forming the furnace enclosure. The flue gas leaves the furnace through a defined nose or screen and enters the ",[64,480,482],{"href":481},"\u002Fglossary\u002Fconvective-pass-backpass","convective pass"," where conductive heat transfer dominates.",[83,485,487],{"id":486},"fouling-at-the-furnaceconvective-interface","Fouling at the furnace–convective interface",[56,489,490,491,494,495,498,499,503,504,506,507,511],{},"The transition from the radiant furnace to the convective pass — sometimes called the ",[111,492,493],{},"furnace outlet"," or ",[111,496,497],{},"nose"," — is where ",[64,500,502],{"href":501},"\u002Fglossary\u002Fslagging","slag"," is most likely to accumulate. Hot ash particles approaching this interface lose energy fast enough to bond onto cooler tube surfaces. ",[64,505,385],{"href":384}," are generally not effective inside the furnace itself (molten slag is too well-bonded for acoustic energy to dislodge) but are effective immediately downstream where deposits are still partly dry. Furnace cleaning is dominated by steam ",[64,508,510],{"href":509},"\u002Fglossary\u002Fsteam-sootblower","sootblowers"," and water cannons.",[83,513,148],{"id":147},[88,515,516,521,525,530],{},[91,517,518],{},[64,519,520],{"href":66},"Boiler",[91,522,523],{},[64,524,173],{"href":172},[91,526,527],{},[64,528,529],{"href":501},"Slagging",[91,531,532],{},[64,533,534],{"href":133},"Water cannon",{"title":175,"searchDepth":176,"depth":176,"links":536},[537,538,539],{"id":471,"depth":176,"text":472},{"id":486,"depth":176,"text":487},{"id":147,"depth":176,"text":148},"boiler","The furnace is the radiant combustion chamber of an industrial boiler — the space where the burner flame develops, fuel combusts, and the bulk of the heat release happens. Furnace temperatures vary by fuel and design: 1,300–1,700 °C in PC boilers, 850–900 °C in CFB, 900–1,100 °C in WtE grate boilers.",{},[540,192,544,545],"slagging","water-cannon",{"title":547,"description":548},"Furnace — the radiant combustion chamber of an industrial boiler","The furnace is the radiant chamber of a boiler where fuel burns at 1,300–1,700 °C. Waterwalls absorb the radiant heat; molten slag is the dominant fouling concern.",[550],{"title":551,"url":552},"Wikipedia — Boiler","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FBoiler","glossary\u002Ffurnace","Furnace (boiler)","ascFcmPz_93K0IlA67TDVLEjlt7L-vO-FFoRqO3H7AY",{"id":557,"title":173,"aliases":558,"body":562,"category":540,"description":666,"extension":184,"meta":667,"navigation":186,"path":172,"relatedTerms":668,"seo":670,"sources":673,"stem":677,"term":173,"__hash__":678},"glossary\u002Fglossary\u002Fwaterwall.md",[559,560,561],"water wall","membrane wall","furnace wall",{"type":53,"value":563,"toc":659},[564,573,577,580,584,590,594,599,623,627,634,636],[56,565,566,569,570,572],{},[59,567,568],{},"Waterwalls"," are panels of vertical evaporator tubes welded into a gas-tight membrane that line the ",[64,571,191],{"href":166}," walls of an industrial boiler. They absorb the radiant heat of the burning fuel and produce most of the boiler's steam.",[83,574,576],{"id":575},"construction","Construction",[56,578,579],{},"Adjacent tubes are connected by a thin steel fin running their full length, forming a continuous gas-tight pressure boundary. Tube diameters are typically 38–63 mm, on 50–80 mm pitches. Wall sections can be hung from headers above (suspension waterwalls) or supported from below (sit-on).",[83,581,583],{"id":582},"fouling-slag-not-ash","Fouling: slag, not ash",[56,585,586,587,589],{},"Furnace temperatures and radiant heat transfer mean that any ash that hits the waterwall is partly molten. Cooled rapidly against the tube wall, it solidifies as ",[64,588,502],{"href":501},". Slag is hard, bonded, and grows in characteristic patterns: thicker near burner clusters, thinner in cold corners.",[83,591,593],{"id":592},"cleaning-waterwalls","Cleaning waterwalls",[56,595,596,598],{},[64,597,385],{"href":384}," are not effective on hard furnace slag — the deposit is too well-bonded for acoustic energy to dislodge. The standard cleaning tools are:",[88,600,601,609,615],{},[91,602,603,608],{},[59,604,605],{},[64,606,607],{"href":133},"Water cannons"," — high-pressure water lances mounted on the waterwall, fired at specific tube sections",[91,610,611,614],{},[59,612,613],{},"Wall blowers"," — short retract sootblowers with multiple nozzles",[91,616,617,622],{},[59,618,619],{},[64,620,621],{"href":138},"Explosive deslagging"," — periodic shock cleaning for severe build-up",[83,624,626],{"id":625},"tube-failures-on-waterwalls","Tube failures on waterwalls",[56,628,629,633],{},[64,630,632],{"href":631},"\u002Fglossary\u002Ftube-erosion-tube-wastage","Tube erosion"," and tube wastage on waterwalls are the leading cause of forced outages on coal-fired and biomass boilers. Mitigation is largely combustion-control rather than cleaning, but excessive aggressive cleaning (especially water cannons) contributes to thermal-fatigue cracking.",[83,635,148],{"id":147},[88,637,638,642,646,650,655],{},[91,639,640],{},[64,641,520],{"href":66},[91,643,644],{},[64,645,167],{"href":166},[91,647,648],{},[64,649,529],{"href":501},[91,651,652],{},[64,653,654],{"href":631},"Tube erosion \u002F tube wastage",[91,656,657],{},[64,658,534],{"href":133},{"title":175,"searchDepth":176,"depth":176,"links":660},[661,662,663,664,665],{"id":575,"depth":176,"text":576},{"id":582,"depth":176,"text":583},{"id":592,"depth":176,"text":593},{"id":625,"depth":176,"text":626},{"id":147,"depth":176,"text":148},"Waterwalls are panels of vertical evaporator tubes welded into a gas-tight membrane that line the furnace walls of an industrial boiler. They absorb the radiant heat of the burning fuel and produce most of the boiler's steam.",{},[540,191,544,669,545],"tube-erosion-tube-wastage",{"title":671,"description":672},"Waterwall — tube panels lining the furnace of a boiler","Waterwalls are panels of vertical evaporator tubes welded into a gas-tight membrane that line the furnace. They absorb radiant heat and produce most of the boiler's steam.",[674],{"title":675,"url":676},"Wikipedia — Water-tube boiler","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FWater-tube_boiler","glossary\u002Fwaterwall","rkJ624Wtxzhq9pJlFII6R5mMnwza1b97OTUWYv_7eng",1782613747353]