[{"data":1,"prerenderedAt":573},["ShallowReactive",2],{"site-footer-common":3,"glossary:high-alumina-refractory":45,"glossary-related:high-alumina-refractory":162},{"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":51,"category":143,"description":144,"extension":145,"meta":146,"navigation":147,"path":148,"relatedTerms":149,"seo":153,"sources":156,"stem":160,"term":47,"__hash__":161},"glossary\u002Fglossary\u002Fhigh-alumina-refractory.md","High-alumina refractory",[49,50],"high-alumina brick","high alumina refractory",{"type":52,"value":53,"toc":137},"minimark",[54,72,77,116,120],[55,56,57,60,61,66,67,71],"p",{},[58,59,47],"strong",{}," bricks contain 60–95% Al₂O₃ and serve in the highest-temperature zones of ",[62,63,65],"a",{"href":64},"\u002Fglossary\u002Frotary-kiln","cement rotary kilns",", ",[62,68,70],{"href":69},"\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.",[73,74,76],"h2",{"id":75},"where-it-serves","Where it serves",[78,79,80,89,96,108],"ul",{},[81,82,83,84,88],"li",{},"Cement kiln burning zone — direct contact with ",[62,85,87],{"href":86},"\u002Fglossary\u002Fclinker","clinker"," and combustion gas at 1,450 °C+",[81,90,91,95],{},[62,92,94],{"href":93},"\u002Fglossary\u002Fcalciner","Calciner"," — high-temperature, AFR-driven aggressive chemistry",[81,97,98,102,103,107],{},[62,99,101],{"href":100},"\u002Fglossary\u002Fbasic-oxygen-furnace","BOF"," and ",[62,104,106],{"href":105},"\u002Fglossary\u002Felectric-arc-furnace","EAF"," linings",[81,109,110,111,115],{},"High-temperature ",[62,112,114],{"href":113},"\u002Fglossary\u002Fwaste-heat-boiler","waste-heat boilers"," in metallurgical service",[73,117,119],{"id":118},"related-terms","Related terms",[78,121,122,128,133],{},[81,123,124],{},[62,125,127],{"href":126},"\u002Fglossary\u002Frefractory-castable-brick","Refractory (castable \u002F brick)",[81,129,130],{},[62,131,132],{"href":64},"Rotary kiln",[81,134,135],{},[62,136,94],{"href":93},{"title":138,"searchDepth":139,"depth":139,"links":140},"",2,[141,142],{"id":75,"depth":139,"text":76},{"id":118,"depth":139,"text":119},"materials-construction","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.","md",{},true,"\u002Fglossary\u002Fhigh-alumina-refractory",[150,151,152],"refractory-castable-brick","rotary-kiln","calciner",{"title":154,"description":155},"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.",[157],{"title":158,"url":159},"Wikipedia — Refractory","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FRefractory","glossary\u002Fhigh-alumina-refractory","S64nR1XGsQGqdUZwpbTI9c5ysfsl-I8pDRf4WYq31r8",[163,293,441],{"id":164,"title":127,"aliases":165,"body":169,"category":143,"description":279,"extension":145,"meta":280,"navigation":147,"path":126,"relatedTerms":281,"seo":285,"sources":288,"stem":290,"term":291,"__hash__":292},"glossary\u002Fglossary\u002Frefractory-castable-brick.md",[166,167,168],"refractory lining","castable refractory","refractory brick",{"type":52,"value":170,"toc":273},[171,190,194,208,212,220,224,249,251],[55,172,173,176,177,66,181,66,184,66,187,189],{},[58,174,175],{},"Refractory"," linings — castable cement-bonded mixes or pre-formed bricks — protect the steel shells of ",[62,178,180],{"href":179},"\u002Fglossary\u002Fboiler","boilers",[62,182,183],{"href":64},"rotary kilns",[62,185,186],{"href":93},"calciners",[62,188,114],{"href":113}," and many other industrial vessels from high-temperature gas and slag attack.",[73,191,193],{"id":192},"castable-vs-brick","Castable vs brick",[78,195,196,202],{},[81,197,198,201],{},[58,199,200],{},"Castable refractory"," — mixed and poured or gunited in place, like concrete; quick installation, good for irregular shapes",[81,203,204,207],{},[58,205,206],{},"Brick refractory"," — pre-formed blocks laid in mortar; longest service life, used for the most demanding applications such as cement kiln burning zones",[73,209,211],{"id":210},"why-refractory-matters-for-sonic-horn-installation","Why refractory matters for sonic-horn installation",[55,213,214,215,219],{},"Sonic horns are mounted on the ",[216,217,218],"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.",[73,221,223],{"id":222},"cleaning-relevance","Cleaning relevance",[78,225,226,233],{},[81,227,228,229,232],{},"Sonic horns do ",[58,230,231],{},"not"," damage refractory — the acoustic field is non-contact",[81,234,235,236,102,240,244,245,248],{},"Aggressive ",[62,237,239],{"href":238},"\u002Fglossary\u002Fwater-cannon","water cannons",[62,241,243],{"href":242},"\u002Fglossary\u002Fexplosive-deslagging","explosive deslagging"," ",[58,246,247],{},"can"," damage refractory through thermal shock or impact",[73,250,119],{"id":118},[78,252,253,257,261,267],{},[81,254,255],{},[62,256,47],{"href":148},[81,258,259],{},[62,260,132],{"href":64},[81,262,263],{},[62,264,266],{"href":265},"\u002Fglossary\u002Ffurnace","Furnace",[81,268,269],{},[62,270,272],{"href":271},"\u002Fglossary\u002Fwaterwall","Waterwall",{"title":138,"searchDepth":139,"depth":139,"links":274},[275,276,277,278],{"id":192,"depth":139,"text":193},{"id":210,"depth":139,"text":211},{"id":222,"depth":139,"text":223},{"id":118,"depth":139,"text":119},"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.",{},[282,151,283,284],"high-alumina-refractory","furnace","waterwall",{"title":286,"description":287},"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.",[289],{"title":158,"url":159},"glossary\u002Frefractory-castable-brick","Refractory (castable and brick)","7Pka35MabIXTZ_zD4RWBbkqoJFZafcr7em2bLjPce7Y",{"id":294,"title":132,"aliases":295,"body":298,"category":424,"description":425,"extension":145,"meta":426,"navigation":147,"path":64,"relatedTerms":427,"seo":432,"sources":435,"stem":439,"term":132,"__hash__":440},"glossary\u002Fglossary\u002Frotary-kiln.md",[296,297],"cement kiln","rotary cement kiln",{"type":52,"value":299,"toc":418},[300,310,314,329,333,336,340,343,380,387,389],[55,301,302,303,306,307,309],{},"A ",[58,304,305],{},"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 ",[62,308,87],{"href":86},". The rotary kiln is the heart of every cement plant.",[73,311,313],{"id":312},"layout","Layout",[55,315,316,317,102,321,323,324,328],{},"The kiln is fed at its upper end by raw meal pre-calcined in the ",[62,318,320],{"href":319},"\u002Fglossary\u002Fpreheater-tower","preheater tower",[62,322,152],{"href":93},". The main burner fires at the lower (clinker discharge) end, opposing the gas flow direction. Discharged clinker falls into the ",[62,325,327],{"href":326},"\u002Fglossary\u002Fclinker-cooler","clinker cooler"," below.",[73,330,332],{"id":331},"why-kiln-stops-are-catastrophic","Why kiln stops are catastrophic",[55,334,335],{},"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.",[73,337,339],{"id":338},"what-stops-the-kiln","What stops the kiln",[55,341,342],{},"Most unplanned kiln stops trace to upstream or downstream problems rather than the kiln itself:",[78,344,345,353,362,368,374],{},[81,346,347,350,351],{},[58,348,349],{},"Preheater pluggage"," — see ",[62,352,320],{"href":319},[81,354,355,361],{},[58,356,357],{},[62,358,360],{"href":359},"\u002Fglossary\u002Fkiln-inlet-ring-snowman","Kiln-inlet ring \u002F snowman"," formation",[81,363,364,367],{},[58,365,366],{},"Clinker cooler upset"," — bridging in the cooler hopper",[81,369,370,373],{},[58,371,372],{},"Calciner pluggage"," — accreted build-up from AFR firing",[81,375,376,379],{},[58,377,378],{},"ID-fan trip"," — fouled blades causing vibration",[55,381,382,386],{},[62,383,385],{"href":384},"\u002Fglossary\u002Fsonic-horn","Sonic horns"," installed across the preheater, calciner and kiln-inlet area address several of these directly.",[73,388,119],{"id":118},[78,390,391,396,401,407,412],{},[81,392,393],{},[62,394,395],{"href":86},"Clinker",[81,397,398],{},[62,399,400],{"href":326},"Clinker cooler",[81,402,403],{},[62,404,406],{"href":405},"\u002Fglossary\u002Fkiln-inlet-riser-duct","Kiln inlet \u002F riser duct",[81,408,409],{},[62,410,411],{"href":319},"Preheater tower",[81,413,414],{},[62,415,417],{"href":416},"\u002Fglossary\u002Falternative-fuel","Alternative fuel",{"title":138,"searchDepth":139,"depth":139,"links":419},[420,421,422,423],{"id":312,"depth":139,"text":313},{"id":331,"depth":139,"text":332},{"id":338,"depth":139,"text":339},{"id":118,"depth":139,"text":119},"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.",{},[87,428,429,430,431],"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":94,"aliases":443,"body":448,"category":424,"description":562,"extension":145,"meta":563,"navigation":147,"path":93,"relatedTerms":564,"seo":566,"sources":569,"stem":571,"term":94,"__hash__":572},"glossary\u002Fglossary\u002Fcalciner.md",[444,445,446,447],"cement calciner","inline calciner","separate calciner","precalciner",{"type":52,"value":449,"toc":556},[450,471,475,492,496,522,526,529,531],[55,451,302,452,454,455,457,458,461,462,465,466,470],{},[58,453,152],{}," is the combustion chamber in a modern cement preheater tower where raw meal is pre-calcined — the endothermic CaCO₃ → CaO + CO₂ reaction is driven to ~90% completion — before the meal enters the ",[62,456,305],{"href":64},". Calciners can be ",[58,459,460],{},"inline"," (placed in the kiln-riser gas path) or ",[58,463,464],{},"separate"," (a dedicated combustion chamber receiving tertiary air through a dedicated ",[62,467,469],{"href":468},"\u002Fglossary\u002Ftertiary-air-duct","tertiary air duct",").",[73,472,474],{"id":473},"afr-firing","AFR firing",[55,476,477,478,481,482,486,487,491],{},"Calciners are the dominant firing location for ",[62,479,480],{"href":416},"alternative fuels"," (",[62,483,485],{"href":484},"\u002Fglossary\u002Frdf-srf-tdf","RDF, SRF, TDF",", sewage sludge). They tolerate variable-quality waste fuels better than the main kiln burner because residence time is longer and temperatures are lower. Cement plants targeting high ",[62,488,490],{"href":489},"\u002Fglossary\u002Fthermal-substitution-rate","thermal substitution rates (TSR)"," concentrate their AFR firing in the calciner.",[73,493,495],{"id":494},"fouling","Fouling",[55,497,498,499,503,504,508,509,512,513,517,518,521],{},"AFR firing in the calciner raises the chlorine and sulphur loading of the gas reaching the ",[62,500,502],{"href":501},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones"," above. This intensifies the ",[62,505,507],{"href":506},"\u002Fglossary\u002Fbuild-up-coating-accretion","build-up"," problem in the lower preheater stages and the ",[62,510,511],{"href":405},"kiln riser",", driving the need for ",[62,514,516],{"href":515},"\u002Fglossary\u002Fchloride-bypass","chloride bypass"," and active ",[62,519,520],{"href":384},"sonic-horn"," cleaning.",[73,523,525],{"id":524},"cleaning","Cleaning",[55,527,528],{},"Sonic horns are mounted on calciner walls and on the calciner outlet to the preheater stage 5 cyclone, keeping the gas path free of the alkali coatings that accumulate at high AFR rates.",[73,530,119],{"id":118},[78,532,533,537,542,546,551],{},[81,534,535],{},[62,536,411],{"href":319},[81,538,539],{},[62,540,541],{"href":501},"Preheater cyclone",[81,543,544],{},[62,545,132],{"href":64},[81,547,548],{},[62,549,550],{"href":416},"Alternative fuel (AFR)",[81,552,553],{},[62,554,555],{"href":384},"Sonic horn",{"title":138,"searchDepth":139,"depth":139,"links":557},[558,559,560,561],{"id":473,"depth":139,"text":474},{"id":494,"depth":139,"text":495},{"id":524,"depth":139,"text":525},{"id":118,"depth":139,"text":119},"A calciner is the combustion chamber in a modern cement preheater tower where raw meal is pre-calcined — the endothermic CaCO₃ → CaO + CO₂ reaction is driven to ~90% completion — before the meal enters the rotary kiln. Calciners can be inline (placed in the kiln-riser gas path) or separate (a dedicated combustion chamber receiving tertiary air through a dedicated tertiary air duct).",{},[430,565,151,431,520],"preheater-cyclone",{"title":567,"description":568},"Calciner — cement-plant pre-calcination chamber for raw meal","A calciner is a combustion chamber in the cement preheater tower where raw meal is pre-calcined (CaCO3 → CaO) before entering the rotary kiln. Common site for AFR firing.",[570],{"title":437,"url":438},"glossary\u002Fcalciner","7__3zwaD-YwbWIprz3qMM76tTceT3xtEYbzJgZ_dq1s",1782613747132]