[{"data":1,"prerenderedAt":1253},["ShallowReactive",2],{"site-footer-common":3,"glossary:differential-pressure-baghouse":45,"glossary-related:differential-pressure-baghouse":269},{"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":53,"category":68,"description":249,"extension":250,"meta":251,"navigation":252,"path":253,"relatedTerms":254,"seo":260,"sources":263,"stem":267,"term":47,"__hash__":268},"glossary\u002Fglossary\u002Fdifferential-pressure-baghouse.md","Differential pressure (baghouse)",[49,50,51,52],"baghouse ΔP","baghouse delta-P","filter ΔP","baghouse dP",{"type":54,"value":55,"toc":241},"minimark",[56,85,90,178,182,189,193,200,204],[57,58,59,63,64,69,70,74,75,79,80,84],"p",{},[60,61,62],"strong",{},"Differential pressure (ΔP)"," across a ",[65,66,68],"a",{"href":67},"\u002Fglossary\u002Fbaghouse","baghouse"," is the pressure drop between the dirty-gas inlet ",[65,71,73],{"href":72},"\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, ",[65,76,78],{"href":77},"\u002Fglossary\u002Fcake-bridging-cake-blinding","bridging"," or ",[65,81,83],{"href":82},"\u002Fglossary\u002Fbag-blinding","blinding",".",[86,87,89],"h2",{"id":88},"typical-operating-bands","Typical operating bands",[91,92,93,112],"table",{},[94,95,96],"thead",{},[97,98,99,103,106,109],"tr",{},[100,101,102],"th",{},"Application",[100,104,105],{},"Normal ΔP",[100,107,108],{},"Alarm",[100,110,111],{},"Trip",[113,114,115,134,152,165],"tbody",{},[97,116,117,125,128,131],{},[118,119,120,121],"td",{},"Cement ",[65,122,124],{"href":123},"\u002Fglossary\u002Fpulse-jet-baghouse","pulse-jet",[118,126,127],{},"8–15 mbar (3–6 inWG)",[118,129,130],{},"20 mbar",[118,132,133],{},"25 mbar",[97,135,136,143,146,149],{},[118,137,138,139],{},"Coal utility ",[65,140,142],{"href":141},"\u002Fglossary\u002Freverse-air-baghouse","reverse-air",[118,144,145],{},"10–18 mbar",[118,147,148],{},"22 mbar",[118,150,151],{},"28 mbar",[97,153,154,157,160,162],{},[118,155,156],{},"WtE pulse-jet",[118,158,159],{},"12–20 mbar",[118,161,133],{},[118,163,164],{},"32 mbar",[97,166,167,170,173,176],{},[118,168,169],{},"Light industrial pulse-jet",[118,171,172],{},"5–12 mbar",[118,174,175],{},"18 mbar",[118,177,133],{},[86,179,181],{"id":180},"why-operators-obsess-over-δp","Why operators obsess over ΔP",[57,183,184,185,188],{},"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 ",[65,186,187],{"href":82},"bag blinding"," and triggers premature bag-change campaigns.",[86,190,192],{"id":191},"how-sonic-horns-reduce-δp","How sonic horns reduce ΔP",[57,194,195,199],{},[65,196,198],{"href":197},"\u002Fglossary\u002Fsonic-horn","Sonic horns"," 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.",[86,201,203],{"id":202},"related-terms","Related terms",[205,206,207,214,219,225,230,236],"ul",{},[208,209,210],"li",{},[65,211,213],{"href":212},"\u002Fglossary\u002Ffabric-filter","Fabric filter",[208,215,216],{},[65,217,218],{"href":67},"Baghouse",[208,220,221],{},[65,222,224],{"href":223},"\u002Fglossary\u002Ffilter-cake","Filter cake",[208,226,227],{},[65,228,229],{"href":82},"Bag blinding",[208,231,232],{},[65,233,235],{"href":234},"\u002Fglossary\u002Fpulse-jet-cleaning-cycle","Pulse-jet cleaning cycle",[208,237,238],{},[65,239,240],{"href":197},"Sonic horn",{"title":242,"searchDepth":243,"depth":243,"links":244},"",2,[245,246,247,248],{"id":88,"depth":243,"text":89},{"id":180,"depth":243,"text":181},{"id":191,"depth":243,"text":192},{"id":202,"depth":243,"text":203},"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.","md",{},true,"\u002Fglossary\u002Fdifferential-pressure-baghouse",[255,68,256,257,258,259],"fabric-filter","filter-cake","bag-blinding","pulse-jet-cleaning-cycle","sonic-horn",{"title":261,"description":262},"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.",[264],{"title":265,"url":266},"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",[270,457,568,710,862,1024],{"id":271,"title":213,"aliases":272,"body":276,"category":68,"description":438,"extension":250,"meta":439,"navigation":252,"path":212,"relatedTerms":440,"seo":445,"sources":448,"stem":455,"term":213,"__hash__":456},"glossary\u002Fglossary\u002Ffabric-filter.md",[273,274,275],"fabric filters","bag filter","dust collector (fabric)",{"type":54,"value":277,"toc":433},[278,299,303,381,385,407,409],[57,279,280,281,284,285,289,290,294,295,298],{},"A ",[60,282,283],{},"fabric filter"," is an air-pollution-control device that removes particulate from a gas stream by passing the gas through woven or felted fibre media — usually in the form of cylindrical ",[65,286,288],{"href":287},"\u002Fglossary\u002Ffilter-bag","filter bags"," — collecting dust as a cake on the bag surface and periodically releasing the cake into a hopper below. Fabric filters are the dominant particulate-control choice on cement plants, ",[65,291,293],{"href":292},"\u002Fglossary\u002Fwaste-to-energy","waste-to-energy"," plants, ",[65,296,297],{"href":292},"biomass"," boilers, metallurgical off-gas, food and chemical process exhaust.",[86,300,302],{"id":301},"why-fabric-filters-compete-with-esps","Why fabric filters compete with ESPs",[91,304,305,320],{},[94,306,307],{},[97,308,309,312,314],{},[100,310,311],{},"Attribute",[100,313,213],{},[100,315,316],{},[65,317,319],{"href":318},"\u002Fglossary\u002Felectrostatic-precipitator","ESP",[113,321,322,333,348,359,370],{},[97,323,324,327,330],{},[118,325,326],{},"Outlet particulate",[118,328,329],{},"\u003C 5 mg\u002FNm³ typical, \u003C 1 mg\u002FNm³ achievable",[118,331,332],{},"10–30 mg\u002FNm³ typical",[97,334,335,342,345],{},[118,336,337,338],{},"Insensitivity to dust ",[65,339,341],{"href":340},"\u002Fglossary\u002Fresistivity","resistivity",[118,343,344],{},"Yes",[118,346,347],{},"No (back-corona risk)",[97,349,350,353,356],{},[118,351,352],{},"Energy consumption",[118,354,355],{},"Higher (ΔP overcomes filter resistance)",[118,357,358],{},"Lower (electrostatic field only)",[97,360,361,364,367],{},[118,362,363],{},"Sensitivity to moisture \u002F dew point",[118,365,366],{},"High",[118,368,369],{},"Lower",[97,371,372,375,378],{},[118,373,374],{},"Footprint",[118,376,377],{},"Typically smaller",[118,379,380],{},"Typically larger",[86,382,384],{"id":383},"where-sonic-horns-fit","Where sonic horns fit",[57,386,387,389,390,392,393,395,396,79,398,402,403,406],{},[65,388,198],{"href":197}," installed on a ",[65,391,68],{"href":67}," supplement the primary cleaning system (",[65,394,124],{"href":123},", ",[65,397,142],{"href":141},[65,399,401],{"href":400},"\u002Fglossary\u002Fshaker-baghouse","shaker",") by reaching dust the primary cleaning misses, reducing ",[65,404,405],{"href":253},"differential pressure",", extending bag life and dislodging cake bridging in hoppers below the bags.",[86,408,203],{"id":202},[205,410,411,415,420,425,429],{},[208,412,413],{},[65,414,218],{"href":67},[208,416,417],{},[65,418,419],{"href":123},"Pulse-jet baghouse",[208,421,422],{},[65,423,424],{"href":287},"Filter bag",[208,426,427],{},[65,428,47],{"href":253},[208,430,431],{},[65,432,240],{"href":197},{"title":242,"searchDepth":243,"depth":243,"links":434},[435,436,437],{"id":301,"depth":243,"text":302},{"id":383,"depth":243,"text":384},{"id":202,"depth":243,"text":203},"A fabric filter is an air-pollution-control device that removes particulate from a gas stream by passing the gas through woven or felted fibre media — usually in the form of cylindrical filter bags — collecting dust as a cake on the bag surface and periodically releasing the cake into a hopper below. Fabric filters are the dominant particulate-control choice on cement plants, waste-to-energy plants, biomass boilers, metallurgical off-gas, food and chemical process exhaust.",{},[68,441,442,443,259,444],"pulse-jet-baghouse","reverse-air-baghouse","filter-bag","differential-pressure-baghouse",{"title":446,"description":447},"Fabric filter — principle, types and acoustic-cleaning benefits","A fabric filter removes particulate from a gas stream by passing it through woven or felted bag media. Sonic horns supplement primary cleaning and reduce differential pressure.",[449,452],{"title":450,"url":451},"Wikipedia — Baghouse","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FBaghouse",{"title":453,"url":454},"Micronics — Sonic Horns for Baghouses","https:\u002F\u002Fwww.micronicsinc.com\u002Fdry-baghouse-filtration\u002Fparts\u002Fbaghouse-accessories\u002Fsonic-horns\u002F","glossary\u002Ffabric-filter","8AjQCKacGq0ZjbUhSjLFzVTtXfqr32f0IVjT2bihoZo",{"id":458,"title":218,"aliases":459,"body":463,"category":68,"description":556,"extension":250,"meta":557,"navigation":252,"path":67,"relatedTerms":558,"seo":561,"sources":564,"stem":566,"term":218,"__hash__":567},"glossary\u002Fglossary\u002Fbaghouse.md",[460,461,462],"baghouses","bag filter house","dust collector house",{"type":54,"value":464,"toc":551},[465,481,485,495,499,502,519,521],[57,466,280,467,469,470,395,474,477,478,480],{},[60,468,68],{}," is the structural enclosure that houses the bags, cages, cleaning system, ",[65,471,473],{"href":472},"\u002Fglossary\u002Ftubesheet","tubesheet",[65,475,476],{"href":72},"plenums"," and hoppers of a ",[65,479,255],{"href":212}," dust collector. The word is used in both broad (\"the plant has a 12-compartment baghouse\") and narrow (\"a baghouse is the housing, the fabric filter is the system\") senses; in everyday industry practice the two terms overlap.",[86,482,484],{"id":483},"compartmented-design","Compartmented design",[57,486,487,488,490,491,494],{},"Large industrial baghouses are subdivided into several compartments — each with its own gas-flow damper — so that one compartment can be isolated for offline cleaning or bag replacement while the rest stay online. The standard ",[65,489,124],{"href":123}," compartment count for utility duty is 8–16; cement and ",[65,492,493],{"href":292},"WtE"," baghouses may run 20+.",[86,496,498],{"id":497},"why-sonic-horns-help","Why sonic horns help",[57,500,501],{},"Sonic horns mounted at compartment level address fouling that the primary cleaning system (pulse-jet, reverse-air or shaker) cannot reach:",[205,503,504,507,513,516],{},[208,505,506],{},"Bag-row dead zones at the back of the compartment",[208,508,509,512],{},[65,510,511],{"href":472},"Tubesheet"," area dust deposits",[208,514,515],{},"Hopper bridging below the bags",[208,517,518],{},"Inlet-plenum dust dropout",[86,520,203],{"id":202},[205,522,523,527,531,536,541,547],{},[208,524,525],{},[65,526,213],{"href":212},[208,528,529],{},[65,530,419],{"href":123},[208,532,533],{},[65,534,535],{"href":141},"Reverse-air baghouse",[208,537,538],{},[65,539,540],{"href":400},"Shaker baghouse",[208,542,543],{},[65,544,546],{"href":545},"\u002Fglossary\u002Fcompartment-isolation","Compartment isolation",[208,548,549],{},[65,550,240],{"href":197},{"title":242,"searchDepth":243,"depth":243,"links":552},[553,554,555],{"id":483,"depth":243,"text":484},{"id":497,"depth":243,"text":498},{"id":202,"depth":243,"text":203},"A baghouse is the structural enclosure that houses the bags, cages, cleaning system, tubesheet, plenums and hoppers of a fabric-filter dust collector. The word is used in both broad (\"the plant has a 12-compartment baghouse\") and narrow (\"a baghouse is the housing, the fabric filter is the system\") senses; in everyday industry practice the two terms overlap.",{},[255,441,442,559,560,259],"shaker-baghouse","compartment-isolation",{"title":562,"description":563},"Baghouse — vessel that houses fabric-filter bags for industrial dust control","A baghouse is the structural enclosure that holds the bags, cages, tubesheet, cleaning system and hoppers of a fabric-filter dust collector. Sized in compartments for online isolation.",[565],{"title":450,"url":451},"glossary\u002Fbaghouse","TraeRQp5lNGOrkFkwjsoYRrhIIRrMkFonwryXyc1wGw",{"id":569,"title":224,"aliases":570,"body":573,"category":68,"description":697,"extension":250,"meta":698,"navigation":252,"path":223,"relatedTerms":699,"seo":701,"sources":704,"stem":708,"term":224,"__hash__":709},"glossary\u002Fglossary\u002Ffilter-cake.md",[571,572],"dust cake","filter cake layer",{"type":54,"value":574,"toc":692},[575,587,591,631,635,666,671,673],[57,576,577,579,580,583,584,586],{},[60,578,224],{}," is the dust layer that progressively builds up on the gas-side surface of a ",[65,581,582],{"href":287},"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 ",[65,585,405],{"href":253}," climbs unsustainably.",[86,588,590],{"id":589},"cake-life-cycle","Cake life cycle",[592,593,594,600,606,619,625],"ol",{},[208,595,596,599],{},[60,597,598],{},"Conditioning"," — a new or freshly cleaned bag is \"pre-coated\" by initial dust loading",[208,601,602,605],{},[60,603,604],{},"Steady-state filtration"," — the cake builds, ΔP rises slowly, outlet remains low",[208,607,608,611,612,395,614,79,616,618],{},[60,609,610],{},"Cleaning cycle"," — ",[65,613,124],{"href":234},[65,615,142],{"href":141},[65,617,401],{"href":400}," releases part of the cake",[208,620,621,624],{},[60,622,623],{},"Residual cake"," — a thin layer remains; ΔP resets but not to zero",[208,626,627,630],{},[60,628,629],{},"Long-term drift"," — over many cycles, residual cake gradually thickens, eventually requiring offline cleaning or bag change",[86,632,634],{"id":633},"how-cake-behaviour-varies","How cake behaviour varies",[205,636,637,643,651,660],{},[208,638,639,642],{},[60,640,641],{},"Coal fly ash"," — releases relatively cleanly under pulse-jet",[208,644,645,648,649],{},[60,646,647],{},"Cement kiln dust"," — can be sticky, prone to ",[65,650,78],{"href":77},[208,652,653,656,657,659],{},[60,654,655],{},"Wet or hygroscopic dusts"," — cake hardens; classic ",[65,658,257],{"href":82}," risk",[208,661,662,665],{},[60,663,664],{},"Sub-micron biomass \u002F WtE ash"," — fine cake bonds firmly to bag surface",[57,667,668,670],{},[65,669,198],{"href":197}," supplement primary cleaning by addressing residual cake before it consolidates.",[86,672,203],{"id":202},[205,674,675,679,684,688],{},[208,676,677],{},[65,678,424],{"href":287},[208,680,681],{},[65,682,683],{"href":77},"Cake bridging \u002F cake blinding",[208,685,686],{},[65,687,229],{"href":82},[208,689,690],{},[65,691,47],{"href":253},{"title":242,"searchDepth":243,"depth":243,"links":693},[694,695,696],{"id":589,"depth":243,"text":590},{"id":633,"depth":243,"text":634},{"id":202,"depth":243,"text":203},"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.",{},[443,700,257,444,258],"cake-bridging-cake-blinding",{"title":702,"description":703},"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.",[705],{"title":706,"url":707},"Wikipedia — Filter cake","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FFilter_cake","glossary\u002Ffilter-cake","i7km6mXaz39JRBZKEHi5VmJkbsQH_9lsoFWRNtoUZrI",{"id":711,"title":229,"aliases":712,"body":715,"category":68,"description":852,"extension":250,"meta":853,"navigation":252,"path":82,"relatedTerms":854,"seo":855,"sources":858,"stem":860,"term":229,"__hash__":861},"glossary\u002Fglossary\u002Fbag-blinding.md",[713,714],"filter bag blinding","bag binding",{"type":54,"value":716,"toc":846},[717,733,737,777,781,803,807,822,824],[57,718,719,721,722,725,726,729,730,732],{},[60,720,229],{}," is the choking of a ",[65,723,724],{"href":287},"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 ",[65,727,728],{"href":234},"cleaning cycle","; ",[65,731,405],{"href":253}," rises and stays high. Blinding is the leading cause of premature bag replacement on most industrial baghouses.",[86,734,736],{"id":735},"when-blinding-accelerates","When blinding accelerates",[205,738,739,745,751,757,768],{},[208,740,741,744],{},[60,742,743],{},"Acid dew-point excursions"," — condensed acid bonds dust into the fabric",[208,746,747,750],{},[60,748,749],{},"Hygroscopic dust"," — moisture pickup turns surface dust into a wet paste",[208,752,753,756],{},[60,754,755],{},"Tar or oil aerosol"," in the inlet gas",[208,758,759,767],{},[60,760,761,762,766],{},"Excessive bag-velocity (",[65,763,765],{"href":764},"\u002Fglossary\u002Fair-to-cloth-ratio","air-to-cloth ratio",")"," — forces particulate into the pores",[208,769,770],{},[60,771,772,773,79,775],{},"Sub-micron ash from ",[65,774,493],{"href":292},[65,776,297],{"href":292},[86,778,780],{"id":779},"mitigation","Mitigation",[205,782,783,786,794,797],{},[208,784,785],{},"Maintain gas temperature above the acid dew point (typically 130–150 °C)",[208,787,788,789,793],{},"Use ",[65,790,792],{"href":791},"\u002Fglossary\u002Fptfe-membrane-filter-bag","PTFE-membrane bags"," for surface filtration where chemistry warrants",[208,795,796],{},"Right-size the baghouse so air-to-cloth ratio stays moderate",[208,798,788,799,802],{},[65,800,801],{"href":197},"sonic horns"," to keep cake from consolidating into the medium before each pulse",[86,804,806],{"id":805},"distinguishing-from-cake-bridging","Distinguishing from cake bridging",[57,808,809,812,813,817,818,821],{},[65,810,811],{"href":77},"Cake bridging"," is a ",[814,815,816],"em",{},"cake-on-surface"," problem and is fixable with better cleaning. Blinding is ",[814,819,820],{},"dust-in-fabric"," and is not fixable without bag replacement.",[86,823,203],{"id":202},[205,825,826,830,834,838,842],{},[208,827,828],{},[65,829,683],{"href":77},[208,831,832],{},[65,833,224],{"href":223},[208,835,836],{},[65,837,424],{"href":287},[208,839,840],{},[65,841,47],{"href":253},[208,843,844],{},[65,845,240],{"href":197},{"title":242,"searchDepth":243,"depth":243,"links":847},[848,849,850,851],{"id":735,"depth":243,"text":736},{"id":779,"depth":243,"text":780},{"id":805,"depth":243,"text":806},{"id":202,"depth":243,"text":203},"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.",{},[700,256,443,444,259],{"title":856,"description":857},"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.",[859],{"title":450,"url":451},"glossary\u002Fbag-blinding","-0FrhXk5-j24S5xuHXl-Fl5tAcqRGunLiGuaHiN9eWQ",{"id":863,"title":235,"aliases":864,"body":868,"category":68,"description":1014,"extension":250,"meta":1015,"navigation":252,"path":234,"relatedTerms":1016,"seo":1017,"sources":1020,"stem":1022,"term":235,"__hash__":1023},"glossary\u002Fglossary\u002Fpulse-jet-cleaning-cycle.md",[865,866,867],"pulse cycle","pulse-jet cycle","bag pulsing",{"type":54,"value":869,"toc":1008},[870,884,888,953,957,963,972,975,979,984,986],[57,871,872,873,876,877,879,880,883],{},"The ",[60,874,875],{},"pulse-jet cleaning cycle"," is the firing pattern of brief compressed-air pulses that clean the ",[65,878,288],{"href":287}," of a ",[65,881,882],{"href":123},"pulse-jet baghouse",". The cycle is controlled by a sequencer (often a baghouse PLC) and is tuned through three primary variables.",[86,885,887],{"id":886},"cycle-parameters","Cycle parameters",[91,889,890,903],{},[94,891,892],{},[97,893,894,897,900],{},[100,895,896],{},"Parameter",[100,898,899],{},"Typical range",[100,901,902],{},"Effect of increasing",[113,904,905,916,931,942],{},[97,906,907,910,913],{},[118,908,909],{},"Pulse duration",[118,911,912],{},"100–300 ms",[118,914,915],{},"More cleaning per pulse; more bag flex \u002F wear",[97,917,918,921,924],{},[118,919,920],{},"Pulse interval (continuous mode)",[118,922,923],{},"10–120 s per row",[118,925,926,927,930],{},"Less ",[65,928,929],{"href":223},"filter cake"," build-up; more compressed-air use",[97,932,933,936,939],{},[118,934,935],{},"ΔP set-point (on-demand mode)",[118,937,938],{},"12–18 mbar",[118,940,941],{},"Cleaning fires only when ΔP rises; minimum bag wear",[97,943,944,947,950],{},[118,945,946],{},"Pulse pressure",[118,948,949],{},"4–7 bar",[118,951,952],{},"Stronger pulse; deeper penetration into the bag",[86,954,956],{"id":955},"continuous-vs-on-demand-cleaning","Continuous vs on-demand cleaning",[57,958,959,962],{},[60,960,961],{},"Continuous cycling"," runs the cleaning sequence on a fixed schedule regardless of dust load. Simple, but wastes air and bag life on lightly-loaded periods.",[57,964,965,968,969,971],{},[60,966,967],{},"On-demand cleaning"," fires only when ",[65,970,405],{"href":253}," crosses a set-point. Minimises wear and air use but can fall behind when dust load spikes.",[57,973,974],{},"Most modern baghouses run a hybrid: on-demand control with a maximum-interval limit to prevent indefinite skipping.",[86,976,978],{"id":977},"how-sonic-horns-interact-with-the-pulse-cycle","How sonic horns interact with the pulse cycle",[57,980,981,983],{},[65,982,198],{"href":197}," running continuously between pulse events keep cake from consolidating, which lets the pulse-jet system run a less aggressive cycle for the same ΔP. The combined OPEX saving (lower compressed-air use, longer bag life) is the headline argument for retrofitting horns onto an existing pulse-jet baghouse.",[86,985,203],{"id":202},[205,987,988,992,996,1000,1004],{},[208,989,990],{},[65,991,419],{"href":123},[208,993,994],{},[65,995,424],{"href":287},[208,997,998],{},[65,999,224],{"href":223},[208,1001,1002],{},[65,1003,47],{"href":253},[208,1005,1006],{},[65,1007,240],{"href":197},{"title":242,"searchDepth":243,"depth":243,"links":1009},[1010,1011,1012,1013],{"id":886,"depth":243,"text":887},{"id":955,"depth":243,"text":956},{"id":977,"depth":243,"text":978},{"id":202,"depth":243,"text":203},"The pulse-jet cleaning cycle is the firing pattern of brief compressed-air pulses that clean the filter bags of a pulse-jet baghouse. The cycle is controlled by a sequencer (often a baghouse PLC) and is tuned through three primary variables.",{},[441,443,256,444,259],{"title":1018,"description":1019},"Pulse-jet cleaning cycle — pulse duration, interval and on-demand tuning","The pulse-jet cleaning cycle is the firing pattern of compressed-air pulses across a baghouse. Tuned by pulse duration, interval and ΔP set-point to balance cleaning against bag wear.",[1021],{"title":453,"url":454},"glossary\u002Fpulse-jet-cleaning-cycle","xTWyvWFeqO0jdzrM9_SIfkzZDlTkLFSKbX2ESybPeAA",{"id":1025,"title":240,"aliases":1026,"body":1029,"category":1228,"description":1229,"extension":250,"meta":1230,"navigation":252,"path":197,"relatedTerms":1231,"seo":1238,"sources":1241,"stem":1251,"term":240,"__hash__":1252},"glossary\u002Fglossary\u002Fsonic-horn.md",[801,1027,1028],"sonic cleaning horn","industrial sonic horn",{"type":54,"value":1030,"toc":1221},[1031,1060,1064,1072,1076,1136,1140,1177,1181,1189,1191],[57,1032,280,1033,1036,1037,1041,1042,395,1045,395,1047,395,1051,1055,1056,84],{},[60,1034,1035],{},"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 ",[65,1038,1040],{"href":1039},"\u002Fglossary\u002Facoustic-cleaner","acoustic cleaner"," and the default specification for cleaning ",[65,1043,1044],{"href":318},"ESPs",[65,1046,460],{"href":212},[65,1048,1050],{"href":1049},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR catalysts",[65,1052,1054],{"href":1053},"\u002Fglossary\u002Fsuperheater","boiler heat-transfer surfaces"," and ",[65,1057,1059],{"href":1058},"\u002Fglossary\u002Fhopper","hoppers and silos",[86,1061,1063],{"id":1062},"how-a-sonic-horn-works","How a sonic horn works",[57,1065,1066,1067,1071],{},"Compressed plant air admitted through a ",[65,1068,1070],{"href":1069},"\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.",[86,1073,1075],{"id":1074},"key-parameters","Key parameters",[91,1077,1078,1086],{},[94,1079,1080],{},[97,1081,1082,1084],{},[100,1083,896],{},[100,1085,899],{},[113,1087,1088,1096,1104,1112,1120,1128],{},[97,1089,1090,1093],{},[118,1091,1092],{},"Fundamental frequency",[118,1094,1095],{},"60–400 Hz",[97,1097,1098,1101],{},[118,1099,1100],{},"Sound pressure level",[118,1102,1103],{},"140–180 dB",[97,1105,1106,1109],{},[118,1107,1108],{},"Compressed-air consumption",[118,1110,1111],{},"8–14 Nm³\u002Fmin at 4–7 bar",[97,1113,1114,1117],{},[118,1115,1116],{},"Operating temperature (with appropriate materials)",[118,1118,1119],{},"−40 °C to +500 °C",[97,1121,1122,1125],{},[118,1123,1124],{},"Firing cycle",[118,1126,1127],{},"5–15 s burst, repeated every 3–15 minutes",[97,1129,1130,1133],{},[118,1131,1132],{},"Mass",[118,1134,1135],{},"15–60 kg depending on horn size",[86,1137,1139],{"id":1138},"frequency-selection","Frequency selection",[57,1141,1142,1143,395,1147,1151,1152,395,1156,1160,1161,395,1164,1168,1169,1055,1173,84],{},"Lower frequencies (60–125 Hz) project longer wavelengths and penetrate further into large open vessels — ",[65,1144,1146],{"href":1145},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones",[65,1148,1150],{"href":1149},"\u002Fglossary\u002Frecovery-boiler","recovery-boiler superheaters",", large ",[65,1153,1155],{"href":1154},"\u002Fglossary\u002Fesp-field-bus-section","ESP fields",[65,1157,1159],{"href":1158},"\u002Fglossary\u002Fsilo","silos",". Higher frequencies (230–400 Hz) carry more energy per unit volume and suit finer dust loads in ",[65,1162,1163],{"href":212},"fabric-filter compartments",[65,1165,1167],{"href":1166},"\u002Fglossary\u002Fhoneycomb-catalyst","catalyst layers"," and smaller hopper geometries. See ",[65,1170,1172],{"href":1171},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","low-frequency acoustic cleaner",[65,1174,1176],{"href":1175},"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner","high-frequency acoustic cleaner",[86,1178,1180],{"id":1179},"sonic-horn-vs-steam-sootblower","Sonic horn vs steam sootblower",[57,1182,1183,1184,1188],{},"Sonic horns are increasingly specified alongside or in place of ",[65,1185,1187],{"href":1186},"\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.",[86,1190,203],{"id":202},[205,1192,1193,1198,1204,1210,1216],{},[208,1194,1195],{},[65,1196,1197],{"href":1039},"Acoustic cleaner",[208,1199,1200],{},[65,1201,1203],{"href":1202},"\u002Fglossary\u002Fsonic-sootblower","Sonic sootblower",[208,1205,1206],{},[65,1207,1209],{"href":1208},"\u002Fglossary\u002Fbell-horn","Bell horn",[208,1211,1212],{},[65,1213,1215],{"href":1214},"\u002Fglossary\u002Fdiaphragm-horn","Diaphragm horn",[208,1217,1218],{},[65,1219,1220],{"href":1171},"Low-frequency acoustic cleaner",{"title":242,"searchDepth":243,"depth":243,"links":1222},[1223,1224,1225,1226,1227],{"id":1062,"depth":243,"text":1063},{"id":1074,"depth":243,"text":1075},{"id":1138,"depth":243,"text":1139},{"id":1179,"depth":243,"text":1180},{"id":202,"depth":243,"text":203},"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.",{},[1232,1233,1234,1235,1236,1237],"acoustic-cleaner","acoustic-cleaning-system","sonic-sootblower","bell-horn","diaphragm-horn","low-frequency-acoustic-cleaner",{"title":1239,"description":1240},"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.",[1242,1245,1248],{"title":1243,"url":1244},"Power Engineering — Sonic Horns: A User's Introduction","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Fsonic-horns-a-userrsquos-introduction\u002F",{"title":1246,"url":1247},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F",{"title":1249,"url":1250},"Wikipedia — Sonic soot blowers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSonic_soot_blowers","glossary\u002Fsonic-horn","YzrhN0kKzqSaQo0wfn0rueNZ-V43mcg5zahqeWi3lnU",1782613721164]