[{"data":1,"prerenderedAt":693},["ShallowReactive",2],{"site-footer-common":3,"glossary:bfb-boiler":45,"glossary-related:bfb-boiler":173},{"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":154,"description":155,"extension":156,"meta":157,"navigation":158,"path":159,"relatedTerms":160,"seo":163,"sources":166,"stem":170,"term":171,"__hash__":172},"glossary\u002Fglossary\u002Fbfb-boiler.md","BFB boiler (bubbling fluidised bed)",[49,50,51],"BFB boiler","bubbling fluidised bed","bubbling fluidized bed",{"type":53,"value":54,"toc":147},"minimark",[55,70,75,98,102,125,129],[56,57,58,59,63,64,69],"p",{},"A ",[60,61,62],"strong",{},"bubbling fluidised-bed (BFB) boiler"," burns fuel in a bed of inert solids fluidised by an upward gas flow slow enough that the bed surface bubbles like boiling water but particles do not entrain into the flue gas. Compared with ",[65,66,68],"a",{"href":67},"\u002Fglossary\u002Fcfb-boiler","CFB",", BFB uses lower fluidisation velocity, no external cyclone, and a simpler bed-management regime.",[71,72,74],"h2",{"id":73},"where-bfb-is-used","Where BFB is used",[76,77,78,82,85,92,95],"ul",{},[79,80,81],"li",{},"Wet biomass and forest residues",[79,83,84],{},"Sewage-sludge incineration",[79,86,87,91],{},[65,88,90],{"href":89},"\u002Fglossary\u002Fhog-fuel-boiler-bark-boiler","Hog-fuel"," and bark boilers at pulp mills",[79,93,94],{},"Small-to-mid capacity district-heating and process-steam duty",[79,96,97],{},"High-moisture, low-calorific fuels generally",[71,99,101],{"id":100},"fouling","Fouling",[56,103,104,105,109,110,114,115,119,120,124],{},"The fouling pattern resembles a CFB but with less cyclone deposition. The convective pass, ",[65,106,108],{"href":107},"\u002Fglossary\u002Feconomiser","economiser"," and ",[65,111,113],{"href":112},"\u002Fglossary\u002Fair-heater","air heater"," accumulate fine ash; the ",[65,116,118],{"href":117},"\u002Fglossary\u002Fwaterwall","waterwall"," above the bed can experience alkali-rich slagging on agricultural-residue and straw fuels. ",[65,121,123],{"href":122},"\u002Fglossary\u002Fsonic-horn","Sonic horns"," on the convective pass and air-heater cold end are the typical cleaning fit.",[71,126,128],{"id":127},"related-terms","Related terms",[76,130,131,137,142],{},[79,132,133],{},[65,134,136],{"href":135},"\u002Fglossary\u002Fboiler","Boiler",[79,138,139],{},[65,140,141],{"href":67},"CFB boiler",[79,143,144],{},[65,145,146],{"href":89},"Hog-fuel boiler \u002F bark boiler",{"title":148,"searchDepth":149,"depth":149,"links":150},"",2,[151,152,153],{"id":73,"depth":149,"text":74},{"id":100,"depth":149,"text":101},{"id":127,"depth":149,"text":128},"boiler","A bubbling fluidised-bed (BFB) boiler burns fuel in a bed of inert solids fluidised by an upward gas flow slow enough that the bed surface bubbles like boiling water but particles do not entrain into the flue gas. Compared with CFB, BFB uses lower fluidisation velocity, no external cyclone, and a simpler bed-management regime.","md",{},true,"\u002Fglossary\u002Fbfb-boiler",[154,161,162],"cfb-boiler","hog-fuel-boiler-bark-boiler",{"title":164,"description":165},"BFB boiler — bubbling fluidised-bed combustion for biomass and sludge","A BFB boiler suspends fuel in a slowly-bubbling bed of inert solids. Lower fluidisation velocity than CFB; suited to high-moisture biomass and sludges.",[167],{"title":168,"url":169},"Wikipedia — Fluidized bed combustion","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FFluidized_bed_combustion","glossary\u002Fbfb-boiler","Bubbling fluidised-bed boiler","Bzx0JXI9cax6PUkf7iAsR15RqikYZIcxMt5DAlUZ8LA",[174,414,548],{"id":175,"title":136,"aliases":176,"body":180,"category":154,"description":393,"extension":156,"meta":394,"navigation":158,"path":135,"relatedTerms":395,"seo":402,"sources":405,"stem":412,"term":136,"__hash__":413},"glossary\u002Fglossary\u002Fboiler.md",[177,178,179],"industrial boiler","utility boiler","steam generator",{"type":53,"value":181,"toc":388},[182,208,212,325,329,357,359],[56,183,58,184,186,187,191,192,109,195,199,200,109,204,207],{},[60,185,154],{}," is a closed vessel in which fuel chemical energy is converted to steam by transferring heat into water flowing through tube banks. Industrial and utility boilers serve electricity generation, district heating, process steam, ",[65,188,190],{"href":189},"\u002Fglossary\u002Fwaste-to-energy","WtE",", ",[65,193,194],{"href":189},"biomass",[65,196,198],{"href":197},"\u002Fglossary\u002Frecovery-boiler","pulp-and-paper"," operations. All of them foul; the only variables are ",[201,202,203],"em",{},"how much",[201,205,206],{},"with what",".",[71,209,211],{"id":210},"boiler-families","Boiler families",[213,214,215,231],"table",{},[216,217,218],"thead",{},[219,220,221,225,228],"tr",{},[222,223,224],"th",{},"Type",[222,226,227],{},"Fuel",[222,229,230],{},"Notes",[232,233,234,249,261,273,286,299,310],"tbody",{},[219,235,236,243,246],{},[237,238,239],"td",{},[65,240,242],{"href":241},"\u002Fglossary\u002Fpc-boiler","PC boiler",[237,244,245],{},"Pulverised coal",[237,247,248],{},"Dominant utility design",[219,250,251,255,258],{},[237,252,253],{},[65,254,141],{"href":67},[237,256,257],{},"Coal, biomass, RDF, lignite",[237,259,260],{},"Tolerates wider fuel range; lower NOx",[219,262,263,267,270],{},[237,264,265],{},[65,266,49],{"href":159},[237,268,269],{},"Biomass, sludge, low-grade fuels",[237,271,272],{},"Bubbling fluidised bed",[219,274,275,280,283],{},[237,276,277],{},[65,278,279],{"href":197},"Recovery boiler",[237,281,282],{},"Black liquor (kraft pulp mills)",[237,284,285],{},"Combines chemicals recovery with steam",[219,287,288,293,296],{},[237,289,290],{},[65,291,292],{"href":89},"Hog-fuel boiler",[237,294,295],{},"Wood waste, bark",[237,297,298],{},"Common at pulp mills as side boilers",[219,300,301,304,307],{},[237,302,303],{},"Gas \u002F oil boiler",[237,305,306],{},"Natural gas, fuel oil",[237,308,309],{},"Lower particulate, less fouling",[219,311,312,315,318],{},[237,313,314],{},"HRSG",[237,316,317],{},"Gas-turbine exhaust",[237,319,320,321],{},"See ",[65,322,324],{"href":323},"\u002Fglossary\u002Fheat-recovery-steam-generator","heat-recovery steam generator",[71,326,328],{"id":327},"where-sonic-horns-sit","Where sonic horns sit",[56,330,331,333,334,191,336,191,340,109,344,346,347,351,352,356],{},[65,332,123],{"href":122}," installed across the convective pass — between ",[65,335,108],{"href":107},[65,337,339],{"href":338},"\u002Fglossary\u002Fsuperheater","superheaters",[65,341,343],{"href":342},"\u002Fglossary\u002Freheater","reheater",[65,345,113],{"href":112}," — dislodge ash and soot continuously, supplementing or partially replacing steam ",[65,348,350],{"href":349},"\u002Fglossary\u002Fsteam-sootblower","sootblowers",". The benefit shows up as ",[65,353,355],{"href":354},"\u002Fglossary\u002Fheat-rate","heat rate"," recovery, deferred outages and longer intervals between water washes.",[71,358,128],{"id":127},[76,360,361,365,369,373,378,383],{},[79,362,363],{},[65,364,242],{"href":241},[79,366,367],{},[65,368,141],{"href":67},[79,370,371],{},[65,372,279],{"href":197},[79,374,375],{},[65,376,377],{"href":117},"Waterwall",[79,379,380],{},[65,381,382],{"href":107},"Economiser",[79,384,385],{},[65,386,387],{"href":122},"Sonic horn",{"title":148,"searchDepth":149,"depth":149,"links":389},[390,391,392],{"id":210,"depth":149,"text":211},{"id":327,"depth":149,"text":328},{"id":127,"depth":149,"text":128},"A boiler is a closed vessel in which fuel chemical energy is converted to steam by transferring heat into water flowing through tube banks. Industrial and utility boilers serve electricity generation, district heating, process steam, WtE, biomass and pulp-and-paper operations. All of them foul; the only variables are how much and with what.",{},[396,161,397,398,118,108,399,400,401],"pc-boiler","bfb-boiler","recovery-boiler","superheater","air-heater","sonic-horn",{"title":403,"description":404},"Boiler — industrial steam generator types and acoustic-cleaning needs","A boiler is a vessel that converts fuel chemical energy into steam by heating water. Coal-fired, biomass, oil, gas and recovery boilers all foul; sonic horns clean heat-transfer surfaces.",[406,409],{"title":407,"url":408},"Wikipedia — Boiler","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FBoiler",{"title":410,"url":411},"Babcock & Wilcox — Sootblower and Boiler Cleaning Terminology","https:\u002F\u002Fwww.babcock.com\u002Fhome\u002Fabout\u002Fresources\u002Flearning-center\u002Fsootblower-and-boiler-cleaning-terminology-principles-and-applications","glossary\u002Fboiler","pamAnZGo_UeIedDHhYrfv0nP3GCXkNTGi0a197n4b5Q",{"id":415,"title":416,"aliases":417,"body":420,"category":154,"description":536,"extension":156,"meta":537,"navigation":158,"path":67,"relatedTerms":538,"seo":540,"sources":543,"stem":545,"term":546,"__hash__":547},"glossary\u002Fglossary\u002Fcfb-boiler.md","CFB boiler (circulating fluidised bed)",[141,418,419],"circulating fluidised bed boiler","circulating fluidized bed",{"type":53,"value":421,"toc":531},[422,436,440,443,467,470,474,501,506,508],[56,423,58,424,427,428,432,433,435],{},[60,425,426],{},"circulating fluidised-bed (CFB) boiler"," burns fuel in a turbulent bed of sand, ash and limestone, circulated by an upward-flowing combustion-air stream and recirculated through external ",[65,429,431],{"href":430},"\u002Fglossary\u002Fcyclone-separator","cyclone separators",". Combustion temperature (~850 °C) is much lower than in a ",[65,434,242],{"href":241},", giving naturally lower NOx and the capability to capture SO₂ in the bed by limestone addition.",[71,437,439],{"id":438},"fuel-flexibility","Fuel flexibility",[56,441,442],{},"CFB boilers tolerate a far wider range of fuels than PC boilers:",[76,444,445,448,451,457,464],{},[79,446,447],{},"Coal (anthracite, bituminous, sub-bituminous, lignite)",[79,449,450],{},"Petroleum coke",[79,452,453,456],{},[65,454,455],{"href":189},"Biomass"," (wood, agricultural residues, bagasse)",[79,458,459,463],{},[65,460,462],{"href":461},"\u002Fglossary\u002Frdf-srf-tdf","RDF"," and waste fractions",[79,465,466],{},"Mixed and low-grade fuels",[56,468,469],{},"This fuel flexibility makes CFB the technology of choice for biomass conversions, waste-fired plants and lignite-rich regions.",[71,471,473],{"id":472},"fouling-pattern","Fouling pattern",[76,475,476,482,495],{},[79,477,478,481],{},[60,479,480],{},"Cyclone fouling"," — recirculating bed material accumulates on cyclone walls and downcomers",[79,483,484,487,488,191,490,109,492,494],{},[60,485,486],{},"Backpass fouling"," — fine ash on ",[65,489,108],{"href":107},[65,491,399],{"href":338},[65,493,400],{"href":112}," tubes",[79,496,497,500],{},[60,498,499],{},"Refractory wear"," in high-velocity zones",[56,502,503,505],{},[65,504,123],{"href":122}," on the backpass surfaces and cyclone walls extend run length between maintenance outages.",[71,507,128],{"id":127},[76,509,510,514,518,522,527],{},[79,511,512],{},[65,513,136],{"href":135},[79,515,516],{},[65,517,49],{"href":159},[79,519,520],{},[65,521,242],{"href":241},[79,523,524],{},[65,525,526],{"href":430},"Cyclone separator",[79,528,529],{},[65,530,387],{"href":122},{"title":148,"searchDepth":149,"depth":149,"links":532},[533,534,535],{"id":438,"depth":149,"text":439},{"id":472,"depth":149,"text":473},{"id":127,"depth":149,"text":128},"A circulating fluidised-bed (CFB) boiler burns fuel in a turbulent bed of sand, ash and limestone, circulated by an upward-flowing combustion-air stream and recirculated through external cyclone separators. Combustion temperature (~850 °C) is much lower than in a PC boiler, giving naturally lower NOx and the capability to capture SO₂ in the bed by limestone addition.",{},[154,397,396,539,401],"cyclone-separator",{"title":541,"description":542},"CFB boiler — circulating fluidised-bed combustion for fuel flexibility","A CFB boiler burns fuel in a turbulent bed of sand, ash and limestone circulated by an upward-flowing gas stream. Tolerates coal, biomass, RDF and lignite; produces low NOx.",[544],{"title":168,"url":169},"glossary\u002Fcfb-boiler","Circulating fluidised-bed boiler","QNumZQl2rNlvci0eemW6ii5Do8yT8iOZn-74mjhC-XY",{"id":549,"title":146,"aliases":550,"body":554,"category":154,"description":680,"extension":156,"meta":681,"navigation":158,"path":89,"relatedTerms":682,"seo":683,"sources":686,"stem":690,"term":691,"__hash__":692},"glossary\u002Fglossary\u002Fhog-fuel-boiler-bark-boiler.md",[551,552,553],"hog fuel boiler","bark boiler","power boiler (pulp mill)",{"type":53,"value":555,"toc":674},[556,572,576,616,620,640,644,649,651],[56,557,58,558,561,562,564,565,568,569,207],{},[60,559,560],{},"hog-fuel boiler"," (or ",[60,563,552],{},", sometimes generically ",[201,566,567],{},"power boiler",") is a biomass-fired auxiliary boiler installed at most pulp and paper mills to burn wood waste, bark, sawdust and screened biomass residues, supplying additional steam and electricity alongside the ",[65,570,571],{"href":197},"kraft recovery boiler",[71,573,575],{"id":574},"combustion-types","Combustion types",[213,577,578,587],{},[216,579,580],{},[219,581,582,584],{},[222,583,224],{},[222,585,586],{},"Fuel handling",[232,588,589,597,607],{},[219,590,591,594],{},[237,592,593],{},"Grate-fired",[237,595,596],{},"Older designs, simple, tolerates wet fuel",[219,598,599,604],{},[237,600,601],{},[65,602,603],{"href":159},"BFB",[237,605,606],{},"Common modern design for variable biomass",[219,608,609,613],{},[237,610,611],{},[65,612,68],{"href":67},[237,614,615],{},"Larger capacity, broader fuel flexibility",[71,617,619],{"id":618},"fouling-characteristics","Fouling characteristics",[76,621,622,625,628,633],{},[79,623,624],{},"Alkali- and chloride-rich ash from bark and forest residues",[79,626,627],{},"High variability in fuel moisture and composition",[79,629,630,631],{},"Slagging on first-pass tubes; bonded ash on ",[65,632,339],{"href":338},[79,634,635,636,109,638],{},"Cold-end build-up on the ",[65,637,108],{"href":107},[65,639,113],{"href":112},[71,641,643],{"id":642},"sonic-horn-fit","Sonic-horn fit",[56,645,646,648],{},[65,647,123],{"href":122}," are well established on hog-fuel-boiler convective passes; the OEM aftermarket teams that serve recovery boilers also typically include hog-fuel cleaning in the same service contract.",[71,650,128],{"id":127},[76,652,653,657,661,665,669],{},[79,654,655],{},[65,656,136],{"href":135},[79,658,659],{},[65,660,49],{"href":159},[79,662,663],{},[65,664,141],{"href":67},[79,666,667],{},[65,668,279],{"href":197},[79,670,671],{},[65,672,673],{"href":338},"Superheater",{"title":148,"searchDepth":149,"depth":149,"links":675},[676,677,678,679],{"id":574,"depth":149,"text":575},{"id":618,"depth":149,"text":619},{"id":642,"depth":149,"text":643},{"id":127,"depth":149,"text":128},"A hog-fuel boiler (or bark boiler, sometimes generically power boiler) is a biomass-fired auxiliary boiler installed at most pulp and paper mills to burn wood waste, bark, sawdust and screened biomass residues, supplying additional steam and electricity alongside the kraft recovery boiler.",{},[154,397,161,398,399],{"title":684,"description":685},"Hog-fuel boiler — biomass side boiler at pulp and paper mills","A hog-fuel or bark boiler burns wood residues, bark and screened biomass to provide auxiliary steam at pulp mills, complementing the kraft recovery boiler.",[687],{"title":688,"url":689},"Power Engineering — Boiler Cleaning Methods","https:\u002F\u002Fwww.power-eng.com\u002Foperations-maintenance\u002Fboiler-cleaning-methods-techniques\u002F","glossary\u002Fhog-fuel-boiler-bark-boiler","Hog-fuel boiler and bark boiler","2KrXPUxJ_G0sFcAwUO2PU9rban8jiTajvilT5OlL89g",1782613724405]