[{"data":1,"prerenderedAt":1218},["ShallowReactive",2],{"site-footer-common":3,"glossary:bag-blinding":45,"glossary-related:bag-blinding":236},{"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":215,"description":216,"extension":217,"meta":218,"navigation":219,"path":220,"relatedTerms":221,"seo":227,"sources":230,"stem":234,"term":47,"__hash__":235},"glossary\u002Fglossary\u002Fbag-blinding.md","Bag blinding",[49,50],"filter bag blinding","bag binding",{"type":52,"value":53,"toc":207},"minimark",[54,77,82,128,132,155,159,175,179],[55,56,57,60,61,66,67,71,72,76],"p",{},[58,59,47],"strong",{}," is the choking of a ",[62,63,65],"a",{"href":64},"\u002Fglossary\u002Ffilter-bag","filter bag's"," pore structure by dust that has worked its way into the fabric itself rather than remaining on the surface. Once embedded, the dust cannot be released by any normal ",[62,68,70],{"href":69},"\u002Fglossary\u002Fpulse-jet-cleaning-cycle","cleaning cycle","; ",[62,73,75],{"href":74},"\u002Fglossary\u002Fdifferential-pressure-baghouse","differential pressure"," rises and stays high. Blinding is the leading cause of premature bag replacement on most industrial baghouses.",[78,79,81],"h2",{"id":80},"when-blinding-accelerates","When blinding accelerates",[83,84,85,92,98,104,115],"ul",{},[86,87,88,91],"li",{},[58,89,90],{},"Acid dew-point excursions"," — condensed acid bonds dust into the fabric",[86,93,94,97],{},[58,95,96],{},"Hygroscopic dust"," — moisture pickup turns surface dust into a wet paste",[86,99,100,103],{},[58,101,102],{},"Tar or oil aerosol"," in the inlet gas",[86,105,106,114],{},[58,107,108,109,113],{},"Excessive bag-velocity (",[62,110,112],{"href":111},"\u002Fglossary\u002Fair-to-cloth-ratio","air-to-cloth ratio",")"," — forces particulate into the pores",[86,116,117],{},[58,118,119,120,124,125],{},"Sub-micron ash from ",[62,121,123],{"href":122},"\u002Fglossary\u002Fwaste-to-energy","WtE"," or ",[62,126,127],{"href":122},"biomass",[78,129,131],{"id":130},"mitigation","Mitigation",[83,133,134,137,145,148],{},[86,135,136],{},"Maintain gas temperature above the acid dew point (typically 130–150 °C)",[86,138,139,140,144],{},"Use ",[62,141,143],{"href":142},"\u002Fglossary\u002Fptfe-membrane-filter-bag","PTFE-membrane bags"," for surface filtration where chemistry warrants",[86,146,147],{},"Right-size the baghouse so air-to-cloth ratio stays moderate",[86,149,139,150,154],{},[62,151,153],{"href":152},"\u002Fglossary\u002Fsonic-horn","sonic horns"," to keep cake from consolidating into the medium before each pulse",[78,156,158],{"id":157},"distinguishing-from-cake-bridging","Distinguishing from cake bridging",[55,160,161,165,166,170,171,174],{},[62,162,164],{"href":163},"\u002Fglossary\u002Fcake-bridging-cake-blinding","Cake bridging"," is a ",[167,168,169],"em",{},"cake-on-surface"," problem and is fixable with better cleaning. Blinding is ",[167,172,173],{},"dust-in-fabric"," and is not fixable without bag replacement.",[78,176,178],{"id":177},"related-terms","Related terms",[83,180,181,186,192,197,202],{},[86,182,183],{},[62,184,185],{"href":163},"Cake bridging \u002F cake blinding",[86,187,188],{},[62,189,191],{"href":190},"\u002Fglossary\u002Ffilter-cake","Filter cake",[86,193,194],{},[62,195,196],{"href":64},"Filter bag",[86,198,199],{},[62,200,201],{"href":74},"Differential pressure (baghouse)",[86,203,204],{},[62,205,206],{"href":152},"Sonic horn",{"title":208,"searchDepth":209,"depth":209,"links":210},"",2,[211,212,213,214],{"id":80,"depth":209,"text":81},{"id":130,"depth":209,"text":131},{"id":157,"depth":209,"text":158},{"id":177,"depth":209,"text":178},"baghouse","Bag blinding is the choking of a filter bag's pore structure by dust that has worked its way into the fabric itself rather than remaining on the surface. Once embedded, the dust cannot be released by any normal cleaning cycle; differential pressure rises and stays high. Blinding is the leading cause of premature bag replacement on most industrial baghouses.","md",{},true,"\u002Fglossary\u002Fbag-blinding",[222,223,224,225,226],"cake-bridging-cake-blinding","filter-cake","filter-bag","differential-pressure-baghouse","sonic-horn",{"title":228,"description":229},"Bag blinding — pore choking that destroys baghouse performance","Bag blinding is the choking of filter-bag pores by dust embedded within the medium. It raises differential pressure permanently and is the leading cause of premature bag replacement.",[231],{"title":232,"url":233},"Wikipedia — Baghouse","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FBaghouse","glossary\u002Fbag-blinding","-0FrhXk5-j24S5xuHXl-Fl5tAcqRGunLiGuaHiN9eWQ",[237,436,584,809,986],{"id":238,"title":185,"aliases":239,"body":243,"category":215,"description":424,"extension":217,"meta":425,"navigation":219,"path":163,"relatedTerms":426,"seo":428,"sources":431,"stem":433,"term":434,"__hash__":435},"glossary\u002Fglossary\u002Fcake-bridging-cake-blinding.md",[240,241,242],"cake bridging","cake blinding","bag bridging",{"type":52,"value":244,"toc":417},[245,261,264,271,275,286,290,368,372,393,395],[55,246,247,249,250,252,253,256,257,260],{},[58,248,164],{}," and ",[58,251,241],{}," are two related but distinct failure modes of ",[62,254,255],{"href":190},"filter cake"," inside a ",[62,258,215],{"href":259},"\u002Fglossary\u002Fbaghouse",".",[78,262,164],{"id":263},"cake-bridging",[55,265,266,267,270],{},"Cake bridging is when the accumulated dust cake on adjacent ",[62,268,269],{"href":64},"filter bags"," merges across the gap between them, locking the bags together into a connected mass. The bags can no longer move independently under cleaning pulses; the pulse-jet pressure is absorbed by the joint cake instead of releasing it. ΔP climbs, primary cleaning becomes ineffective, and the only remedy without intervention is taking the compartment offline.",[78,272,274],{"id":273},"cake-blinding","Cake blinding",[55,276,277,278,281,282,285],{},"Cake blinding (or ",[167,279,280],{},"bag blinding",") is when particulate works its way into the bag pore structure itself, embedding in the fabric and choking the open pore area. Unlike surface cake, blinding cannot be released by any normal cleaning cycle — the dust is ",[167,283,284],{},"inside"," the medium. Blinding is the dominant cause of premature bag replacement.",[78,287,289],{"id":288},"causes","Causes",[291,292,293,309],"table",{},[294,295,296],"thead",{},[297,298,299,303,306],"tr",{},[300,301,302],"th",{},"Cause",[300,304,305],{},"Bridging",[300,307,308],{},"Blinding",[310,311,312,323,332,341,350,359],"tbody",{},[297,313,314,318,321],{},[315,316,317],"td",{},"Bag spacing too close",[315,319,320],{},"✓",[315,322],{},[297,324,325,328,330],{},[315,326,327],{},"Hygroscopic \u002F wet dust",[315,329,320],{},[315,331,320],{},[297,333,334,337,339],{},[315,335,336],{},"Acid dew-point excursion",[315,338],{},[315,340,320],{},[297,342,343,346,348],{},[315,344,345],{},"Tar \u002F oil aerosol in gas",[315,347],{},[315,349,320],{},[297,351,352,355,357],{},[315,353,354],{},"Sticky biomass \u002F WtE ash",[315,356,320],{},[315,358,320],{},[297,360,361,364,366],{},[315,362,363],{},"Insufficient cleaning intensity",[315,365,320],{},[315,367],{},[78,369,371],{"id":370},"prevention","Prevention",[83,373,374,381,384,387],{},[86,375,376,377,380],{},"Correct media selection (e.g. ",[62,378,379],{"href":142},"PTFE membrane"," for sticky chemistry)",[86,382,383],{},"Adequate cleaning intensity matched to dust load",[86,385,386],{},"Compartment isolation when dew-point excursions are imminent",[86,388,389,392],{},[62,390,391],{"href":152},"Sonic horns"," to break early bridging before it consolidates",[78,394,178],{"id":177},[83,396,397,401,405,409,413],{},[86,398,399],{},[62,400,191],{"href":190},[86,402,403],{},[62,404,47],{"href":220},[86,406,407],{},[62,408,201],{"href":74},[86,410,411],{},[62,412,196],{"href":64},[86,414,415],{},[62,416,206],{"href":152},{"title":208,"searchDepth":209,"depth":209,"links":418},[419,420,421,422,423],{"id":263,"depth":209,"text":164},{"id":273,"depth":209,"text":274},{"id":288,"depth":209,"text":289},{"id":370,"depth":209,"text":371},{"id":177,"depth":209,"text":178},"Cake bridging and cake blinding are two related but distinct failure modes of filter cake inside a baghouse.",{},[223,427,225,224,226],"bag-blinding",{"title":429,"description":430},"Cake bridging and cake blinding — what they are and how to prevent them","Cake bridging is dust connecting adjacent bags so the cleaning pulse no longer reaches the surface. Cake blinding is pore choking that raises ΔP and reduces filtration.",[432],{"title":232,"url":233},"glossary\u002Fcake-bridging-cake-blinding","Cake bridging and cake blinding","FuKPxZMIyacCwBs8Wwtwxlq5Lkffh4vEFUalqNBwMe4",{"id":437,"title":191,"aliases":438,"body":441,"category":215,"description":571,"extension":217,"meta":572,"navigation":219,"path":190,"relatedTerms":573,"seo":575,"sources":578,"stem":582,"term":191,"__hash__":583},"glossary\u002Fglossary\u002Ffilter-cake.md",[439,440],"dust cake","filter cake layer",{"type":52,"value":442,"toc":566},[443,455,459,505,509,541,546,548],[55,444,445,447,448,451,452,454],{},[58,446,191],{}," is the dust layer that progressively builds up on the gas-side surface of a ",[62,449,450],{"href":64},"filter bag"," during normal operation. Counter-intuitively, the cake itself performs most of the fine-particle filtration: a fresh bag with no cake has higher penetration than a bag with a developed cake. The art of baghouse operation is to maintain a useful cake without letting it grow so thick that ",[62,453,75],{"href":74}," climbs unsustainably.",[78,456,458],{"id":457},"cake-life-cycle","Cake life cycle",[460,461,462,468,474,493,499],"ol",{},[86,463,464,467],{},[58,465,466],{},"Conditioning"," — a new or freshly cleaned bag is \"pre-coated\" by initial dust loading",[86,469,470,473],{},[58,471,472],{},"Steady-state filtration"," — the cake builds, ΔP rises slowly, outlet remains low",[86,475,476,479,480,483,484,124,488,492],{},[58,477,478],{},"Cleaning cycle"," — ",[62,481,482],{"href":69},"pulse-jet",", ",[62,485,487],{"href":486},"\u002Fglossary\u002Freverse-air-baghouse","reverse-air",[62,489,491],{"href":490},"\u002Fglossary\u002Fshaker-baghouse","shaker"," releases part of the cake",[86,494,495,498],{},[58,496,497],{},"Residual cake"," — a thin layer remains; ΔP resets but not to zero",[86,500,501,504],{},[58,502,503],{},"Long-term drift"," — over many cycles, residual cake gradually thickens, eventually requiring offline cleaning or bag change",[78,506,508],{"id":507},"how-cake-behaviour-varies","How cake behaviour varies",[83,510,511,517,526,535],{},[86,512,513,516],{},[58,514,515],{},"Coal fly ash"," — releases relatively cleanly under pulse-jet",[86,518,519,522,523],{},[58,520,521],{},"Cement kiln dust"," — can be sticky, prone to ",[62,524,525],{"href":163},"bridging",[86,527,528,531,532,534],{},[58,529,530],{},"Wet or hygroscopic dusts"," — cake hardens; classic ",[62,533,427],{"href":220}," risk",[86,536,537,540],{},[58,538,539],{},"Sub-micron biomass \u002F WtE ash"," — fine cake bonds firmly to bag surface",[55,542,543,545],{},[62,544,391],{"href":152}," supplement primary cleaning by addressing residual cake before it consolidates.",[78,547,178],{"id":177},[83,549,550,554,558,562],{},[86,551,552],{},[62,553,196],{"href":64},[86,555,556],{},[62,557,185],{"href":163},[86,559,560],{},[62,561,47],{"href":220},[86,563,564],{},[62,565,201],{"href":74},{"title":208,"searchDepth":209,"depth":209,"links":567},[568,569,570],{"id":457,"depth":209,"text":458},{"id":507,"depth":209,"text":508},{"id":177,"depth":209,"text":178},"Filter cake is the dust layer that progressively builds up on the gas-side surface of a filter bag during normal operation. Counter-intuitively, the cake itself performs most of the fine-particle filtration: a fresh bag with no cake has higher penetration than a bag with a developed cake. The art of baghouse operation is to maintain a useful cake without letting it grow so thick that differential pressure climbs unsustainably.",{},[224,222,427,225,574],"pulse-jet-cleaning-cycle",{"title":576,"description":577},"Filter cake — the dust layer that performs most of the filtration","Filter cake is the dust layer that builds up on the surface of a baghouse filter bag. The cake itself does most of the fine-particle filtration; cleaning balances cake build-up against ΔP.",[579],{"title":580,"url":581},"Wikipedia — Filter cake","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FFilter_cake","glossary\u002Ffilter-cake","i7km6mXaz39JRBZKEHi5VmJkbsQH_9lsoFWRNtoUZrI",{"id":585,"title":196,"aliases":586,"body":588,"category":215,"description":794,"extension":217,"meta":795,"navigation":219,"path":64,"relatedTerms":796,"seo":802,"sources":805,"stem":807,"term":196,"__hash__":808},"glossary\u002Fglossary\u002Ffilter-bag.md",[269,587],"bag (baghouse)",{"type":52,"value":589,"toc":789},[590,611,615,625,718,722,755,757],[55,591,592,593,595,596,600,601,605,606,610],{},"A ",[58,594,450],{}," is the cylindrical fabric sock that traps particulate inside a ",[62,597,599],{"href":598},"\u002Fglossary\u002Ffabric-filter","fabric filter",". Bags are typically 120–300 mm in diameter and 2–10 m long, suspended vertically from the ",[62,602,604],{"href":603},"\u002Fglossary\u002Ftubesheet","tubesheet",", supported internally by a wire ",[62,607,609],{"href":608},"\u002Fglossary\u002Fbag-cage","bag cage"," and sealed at the top by a snap-band collar.",[78,612,614],{"id":613},"media-selection","Media selection",[55,616,617,618,249,622,260],{},"Bag media must match the application temperature, gas chemistry, dust load and cleaning system. See ",[62,619,621],{"href":620},"\u002Fglossary\u002Fp84-nomex-ryton-filter-media","P84 \u002F Nomex \u002F Ryton filter media",[62,623,624],{"href":142},"PTFE membrane filter bag",[291,626,627,640],{},[294,628,629],{},[297,630,631,634,637],{},[300,632,633],{},"Material",[300,635,636],{},"Max continuous temp",[300,638,639],{},"Typical use",[310,641,642,653,664,675,686,697,708],{},[297,643,644,647,650],{},[315,645,646],{},"Polyester",[315,648,649],{},"135 °C",[315,651,652],{},"Cement, food, light industrial",[297,654,655,658,661],{},[315,656,657],{},"Polypropylene",[315,659,660],{},"90 °C",[315,662,663],{},"Wet chemistry, washdown",[297,665,666,669,672],{},[315,667,668],{},"Nomex (aramid)",[315,670,671],{},"200 °C",[315,673,674],{},"Asphalt, metallurgical",[297,676,677,680,683],{},[315,678,679],{},"P84 (polyimide)",[315,681,682],{},"240 °C",[315,684,685],{},"Cement, biomass",[297,687,688,691,694],{},[315,689,690],{},"Ryton (PPS)",[315,692,693],{},"190 °C",[315,695,696],{},"Coal-fired utility, sulphur-rich",[297,698,699,702,705],{},[315,700,701],{},"Fibreglass",[315,703,704],{},"260 °C",[315,706,707],{},"Cement, WtE high-temperature",[297,709,710,713,715],{},[315,711,712],{},"PTFE (Teflon)",[315,714,704],{},[315,716,717],{},"Aggressive chemistry, sub-mg outlet",[78,719,721],{"id":720},"failure-modes","Failure modes",[83,723,724,731,737,743,749],{},[86,725,726,730],{},[58,727,728],{},[62,729,47],{"href":220}," — pore choking that raises ΔP",[86,732,733,736],{},[58,734,735],{},"Abrasion"," — wear at the bottom of the bag from falling cake",[86,738,739,742],{},[58,740,741],{},"Thermal degradation"," — exceeding the media's continuous-service rating",[86,744,745,748],{},[58,746,747],{},"Hydrolysis \u002F acid attack"," — at the cold end below the acid dew point",[86,750,751,754],{},[58,752,753],{},"Cage corrosion"," — failure of the cage allows bag collapse",[78,756,178],{"id":177},[83,758,759,764,769,774,779,785],{},[86,760,761],{},[62,762,763],{"href":598},"Fabric filter",[86,765,766],{},[62,767,768],{"href":259},"Baghouse",[86,770,771],{},[62,772,773],{"href":608},"Bag cage",[86,775,776],{},[62,777,778],{"href":142},"PTFE-membrane filter bag",[86,780,781],{},[62,782,784],{"href":783},"\u002Fglossary\u002Ffibreglass-filter-bag","Fibreglass filter bag",[86,786,787],{},[62,788,47],{"href":220},{"title":208,"searchDepth":209,"depth":209,"links":790},[791,792,793],{"id":613,"depth":209,"text":614},{"id":720,"depth":209,"text":721},{"id":177,"depth":209,"text":178},"A filter bag is the cylindrical fabric sock that traps particulate inside a fabric filter. Bags are typically 120–300 mm in diameter and 2–10 m long, suspended vertically from the tubesheet, supported internally by a wire bag cage and sealed at the top by a snap-band collar.",{},[797,215,798,799,800,801,427],"fabric-filter","bag-cage","ptfe-membrane-filter-bag","fibreglass-filter-bag","p84-nomex-ryton-filter-media",{"title":803,"description":804},"Filter bag — the cylindrical fabric element of a baghouse","A filter bag is the cylindrical fabric sock that traps particulate inside a fabric filter. Media selection depends on temperature, gas chemistry, dust load and cleaning cycle.",[806],{"title":232,"url":233},"glossary\u002Ffilter-bag","c5qm1D9QdtuF4K2dtGAjDJ_qJJmuF0iuEqVTUcRXqww",{"id":810,"title":201,"aliases":811,"body":816,"category":215,"description":974,"extension":217,"meta":975,"navigation":219,"path":74,"relatedTerms":976,"seo":977,"sources":980,"stem":984,"term":201,"__hash__":985},"glossary\u002Fglossary\u002Fdifferential-pressure-baghouse.md",[812,813,814,815],"baghouse ΔP","baghouse delta-P","filter ΔP","baghouse dP",{"type":52,"value":817,"toc":968},[818,837,841,920,924,930,934,939,941],[55,819,820,823,824,826,827,831,832,124,834,260],{},[58,821,822],{},"Differential pressure (ΔP)"," across a ",[62,825,215],{"href":259}," is the pressure drop between the dirty-gas inlet ",[62,828,830],{"href":829},"\u002Fglossary\u002Fplenum-clean-side-dirty-side","plenum"," and the clean-gas outlet plenum. ΔP is the headline operational KPI for any fabric filter: too low signals broken bags or open compartments, too high signals fouling, ",[62,833,525],{"href":163},[62,835,836],{"href":220},"blinding",[78,838,840],{"id":839},"typical-operating-bands","Typical operating bands",[291,842,843,859],{},[294,844,845],{},[297,846,847,850,853,856],{},[300,848,849],{},"Application",[300,851,852],{},"Normal ΔP",[300,854,855],{},"Alarm",[300,857,858],{},"Trip",[310,860,861,878,894,907],{},[297,862,863,869,872,875],{},[315,864,865,866],{},"Cement ",[62,867,482],{"href":868},"\u002Fglossary\u002Fpulse-jet-baghouse",[315,870,871],{},"8–15 mbar (3–6 inWG)",[315,873,874],{},"20 mbar",[315,876,877],{},"25 mbar",[297,879,880,885,888,891],{},[315,881,882,883],{},"Coal utility ",[62,884,487],{"href":486},[315,886,887],{},"10–18 mbar",[315,889,890],{},"22 mbar",[315,892,893],{},"28 mbar",[297,895,896,899,902,904],{},[315,897,898],{},"WtE pulse-jet",[315,900,901],{},"12–20 mbar",[315,903,877],{},[315,905,906],{},"32 mbar",[297,908,909,912,915,918],{},[315,910,911],{},"Light industrial pulse-jet",[315,913,914],{},"5–12 mbar",[315,916,917],{},"18 mbar",[315,919,877],{},[78,921,923],{"id":922},"why-operators-obsess-over-δp","Why operators obsess over ΔP",[55,925,926,927,929],{},"Every additional mbar of ΔP costs ID-fan power and reduces plant throughput. A 5-mbar ΔP rise on a large coal-fired baghouse can mean hundreds of kW of additional fan power and the loss of a few MW of derate-induced generation. Sustained high ΔP also accelerates ",[62,928,280],{"href":220}," and triggers premature bag-change campaigns.",[78,931,933],{"id":932},"how-sonic-horns-reduce-δp","How sonic horns reduce ΔP",[55,935,936,938],{},[62,937,391],{"href":152}," keep the bag-surface cake from consolidating into the medium between primary cleaning cycles. Pulse-jet, reverse-air or shaker cleaning then has less work to do and removes a larger fraction of the cake. Plants retrofitting sonic horns commonly see 2–5 mbar ΔP reduction and 25–40% extension of bag life.",[78,940,178],{"id":177},[83,942,943,947,951,955,959,964],{},[86,944,945],{},[62,946,763],{"href":598},[86,948,949],{},[62,950,768],{"href":259},[86,952,953],{},[62,954,191],{"href":190},[86,956,957],{},[62,958,47],{"href":220},[86,960,961],{},[62,962,963],{"href":69},"Pulse-jet cleaning cycle",[86,965,966],{},[62,967,206],{"href":152},{"title":208,"searchDepth":209,"depth":209,"links":969},[970,971,972,973],{"id":839,"depth":209,"text":840},{"id":922,"depth":209,"text":923},{"id":932,"depth":209,"text":933},{"id":177,"depth":209,"text":178},"Differential pressure (ΔP) across a baghouse is the pressure drop between the dirty-gas inlet plenum and the clean-gas outlet plenum. ΔP is the headline operational KPI for any fabric filter: too low signals broken bags or open compartments, too high signals fouling, bridging or blinding.",{},[797,215,223,427,574,226],{"title":978,"description":979},"Differential pressure (baghouse ΔP) — the headline KPI for fabric filters","Differential pressure (ΔP) across a baghouse is the pressure drop between dirty and clean plenums. It is the headline operational KPI: too low signals broken bags, too high signals fouling.",[981],{"title":982,"url":983},"Sly Inc — How to Monitor Baghouse Health Through Differential Pressure","https:\u002F\u002Fwww.slyinc.com\u002Fblog\u002Fhow-to-monitor-baghouse-health-through-differential-pressure\u002F","glossary\u002Fdifferential-pressure-baghouse","5pIag8o_scInCb_UF6sVlqlEgtkNoIR5M4nNm3qHxk4",{"id":987,"title":206,"aliases":988,"body":991,"category":1193,"description":1194,"extension":217,"meta":1195,"navigation":219,"path":152,"relatedTerms":1196,"seo":1203,"sources":1206,"stem":1216,"term":206,"__hash__":1217},"glossary\u002Fglossary\u002Fsonic-horn.md",[153,989,990],"sonic cleaning horn","industrial sonic horn",{"type":52,"value":992,"toc":1186},[993,1023,1027,1035,1039,1101,1105,1142,1146,1154,1156],[55,994,592,995,998,999,1003,1004,483,1008,483,1011,483,1015,249,1019,260],{},[58,996,997],{},"sonic horn"," is a pneumatically-driven sound emitter that produces high-intensity, low-frequency sound waves — typically between 60 and 400 Hz at sound pressure levels of 140 to 180 dB — used to dislodge particulate fouling from inside industrial process equipment. Sonic horns are the most common form of ",[62,1000,1002],{"href":1001},"\u002Fglossary\u002Facoustic-cleaner","acoustic cleaner"," and the default specification for cleaning ",[62,1005,1007],{"href":1006},"\u002Fglossary\u002Felectrostatic-precipitator","ESPs",[62,1009,1010],{"href":598},"baghouses",[62,1012,1014],{"href":1013},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR catalysts",[62,1016,1018],{"href":1017},"\u002Fglossary\u002Fsuperheater","boiler heat-transfer surfaces",[62,1020,1022],{"href":1021},"\u002Fglossary\u002Fhopper","hoppers and silos",[78,1024,1026],{"id":1025},"how-a-sonic-horn-works","How a sonic horn works",[55,1028,1029,1030,1034],{},"Compressed plant air admitted through a ",[62,1031,1033],{"href":1032},"\u002Fglossary\u002Fsolenoid-valve","solenoid valve"," drives a metal diaphragm — typically titanium or 316 stainless — into resonant oscillation at the horn's fundamental frequency. The oscillating pressure field is amplified by an exponential bell horn and projected into the vessel as a near-spherical sound wave. Particulate already deposited on internal surfaces receives an oscillating acceleration that overcomes adhesion; loosened material is then carried out with the gas flow before it can sinter, bridge or bond. Because the cleaning is acoustic and non-contact, the horn can fire while the plant is online without tube erosion, refractory damage or thermal shock.",[78,1036,1038],{"id":1037},"key-parameters","Key parameters",[291,1040,1041,1051],{},[294,1042,1043],{},[297,1044,1045,1048],{},[300,1046,1047],{},"Parameter",[300,1049,1050],{},"Typical range",[310,1052,1053,1061,1069,1077,1085,1093],{},[297,1054,1055,1058],{},[315,1056,1057],{},"Fundamental frequency",[315,1059,1060],{},"60–400 Hz",[297,1062,1063,1066],{},[315,1064,1065],{},"Sound pressure level",[315,1067,1068],{},"140–180 dB",[297,1070,1071,1074],{},[315,1072,1073],{},"Compressed-air consumption",[315,1075,1076],{},"8–14 Nm³\u002Fmin at 4–7 bar",[297,1078,1079,1082],{},[315,1080,1081],{},"Operating temperature (with appropriate materials)",[315,1083,1084],{},"−40 °C to +500 °C",[297,1086,1087,1090],{},[315,1088,1089],{},"Firing cycle",[315,1091,1092],{},"5–15 s burst, repeated every 3–15 minutes",[297,1094,1095,1098],{},[315,1096,1097],{},"Mass",[315,1099,1100],{},"15–60 kg depending on horn size",[78,1102,1104],{"id":1103},"frequency-selection","Frequency selection",[55,1106,1107,1108,483,1112,1116,1117,483,1121,1125,1126,483,1129,1133,1134,249,1138,260],{},"Lower frequencies (60–125 Hz) project longer wavelengths and penetrate further into large open vessels — ",[62,1109,1111],{"href":1110},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones",[62,1113,1115],{"href":1114},"\u002Fglossary\u002Frecovery-boiler","recovery-boiler superheaters",", large ",[62,1118,1120],{"href":1119},"\u002Fglossary\u002Fesp-field-bus-section","ESP fields",[62,1122,1124],{"href":1123},"\u002Fglossary\u002Fsilo","silos",". Higher frequencies (230–400 Hz) carry more energy per unit volume and suit finer dust loads in ",[62,1127,1128],{"href":598},"fabric-filter compartments",[62,1130,1132],{"href":1131},"\u002Fglossary\u002Fhoneycomb-catalyst","catalyst layers"," and smaller hopper geometries. See ",[62,1135,1137],{"href":1136},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","low-frequency acoustic cleaner",[62,1139,1141],{"href":1140},"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner","high-frequency acoustic cleaner",[78,1143,1145],{"id":1144},"sonic-horn-vs-steam-sootblower","Sonic horn vs steam sootblower",[55,1147,1148,1149,1153],{},"Sonic horns are increasingly specified alongside or in place of ",[62,1150,1152],{"href":1151},"\u002Fglossary\u002Fsteam-sootblower","steam sootblowers"," because they consume no boiler-grade steam, cause no tube erosion, require almost no moving parts and can fire every few minutes without operator intervention. They are less effective on hard, fused slag than retractable steam lances, so on furnace waterwalls and high-temperature superheaters they typically complement rather than replace mechanical cleaning.",[78,1155,178],{"id":177},[83,1157,1158,1163,1169,1175,1181],{},[86,1159,1160],{},[62,1161,1162],{"href":1001},"Acoustic cleaner",[86,1164,1165],{},[62,1166,1168],{"href":1167},"\u002Fglossary\u002Fsonic-sootblower","Sonic sootblower",[86,1170,1171],{},[62,1172,1174],{"href":1173},"\u002Fglossary\u002Fbell-horn","Bell horn",[86,1176,1177],{},[62,1178,1180],{"href":1179},"\u002Fglossary\u002Fdiaphragm-horn","Diaphragm horn",[86,1182,1183],{},[62,1184,1185],{"href":1136},"Low-frequency acoustic cleaner",{"title":208,"searchDepth":209,"depth":209,"links":1187},[1188,1189,1190,1191,1192],{"id":1025,"depth":209,"text":1026},{"id":1037,"depth":209,"text":1038},{"id":1103,"depth":209,"text":1104},{"id":1144,"depth":209,"text":1145},{"id":177,"depth":209,"text":178},"core-technology","A sonic horn is a pneumatically-driven sound emitter that produces high-intensity, low-frequency sound waves — typically between 60 and 400 Hz at sound pressure levels of 140 to 180 dB — used to dislodge particulate fouling from inside industrial process equipment. Sonic horns are the most common form of acoustic cleaner and the default specification for cleaning ESPs, baghouses, SCR catalysts, boiler heat-transfer surfaces and hoppers and silos.",{},[1197,1198,1199,1200,1201,1202],"acoustic-cleaner","acoustic-cleaning-system","sonic-sootblower","bell-horn","diaphragm-horn","low-frequency-acoustic-cleaner",{"title":1204,"description":1205},"Sonic horn — definition, frequency, SPL and industrial applications","A sonic horn is a pneumatically-driven low-frequency sound emitter (typically 60–400 Hz at 140–180 dB SPL) used to dislodge particulate fouling from boilers, ESPs, baghouses and process vessels.",[1207,1210,1213],{"title":1208,"url":1209},"Power Engineering — Sonic Horns: A User's Introduction","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Fsonic-horns-a-userrsquos-introduction\u002F",{"title":1211,"url":1212},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F",{"title":1214,"url":1215},"Wikipedia — Sonic soot blowers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSonic_soot_blowers","glossary\u002Fsonic-horn","YzrhN0kKzqSaQo0wfn0rueNZ-V43mcg5zahqeWi3lnU",1782613719250]