[{"data":1,"prerenderedAt":833},["ShallowReactive",2],{"site-footer-common":3,"glossary:diverter-damper-louver-damper-guillotine-damper":45,"glossary-related:diverter-damper-louver-damper-guillotine-damper":228},{"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":207,"description":208,"extension":209,"meta":210,"navigation":211,"path":212,"relatedTerms":213,"seo":218,"sources":221,"stem":225,"term":226,"__hash__":227},"glossary\u002Fglossary\u002Fdiverter-damper-louver-damper-guillotine-damper.md","Diverter \u002F louver \u002F guillotine damper",[49,50,51,52],"diverter damper","louver damper","guillotine damper","isolation damper",{"type":54,"value":55,"toc":200},"minimark",[56,64,126,131,159,163,171,175],[57,58,59,63],"p",{},[60,61,62],"strong",{},"Dampers"," route, isolate or modulate flue-gas flow inside industrial ducting. Three principal types appear in power and process plants:",[65,66,67,83],"table",{},[68,69,70],"thead",{},[71,72,73,77,80],"tr",{},[74,75,76],"th",{},"Damper",[74,78,79],{},"Function",[74,81,82],{},"Typical position",[84,85,86,100,113],"tbody",{},[71,87,88,94,97],{},[89,90,91],"td",{},[60,92,93],{},"Diverter damper",[89,95,96],{},"Swings flow between two ducts",[89,98,99],{},"HRSG bypass \u002F GT exhaust diverter",[71,101,102,107,110],{},[89,103,104],{},[60,105,106],{},"Louver damper",[89,108,109],{},"Multiple parallel blades for throttling and partial isolation",[89,111,112],{},"Flue-gas distribution, ID-fan modulation",[71,114,115,120,123],{},[89,116,117],{},[60,118,119],{},"Guillotine damper",[89,121,122],{},"Full isolation by sliding plate",[89,124,125],{},"Boiler outlet isolation, baghouse compartment isolation",[127,128,130],"h2",{"id":129},"damper-related-failure-modes","Damper-related failure modes",[132,133,134,141,147,153],"ul",{},[135,136,137,140],"li",{},[60,138,139],{},"Sticking"," — particulate accumulation in blade slots or guillotine guides prevents free movement",[135,142,143,146],{},[60,144,145],{},"Seal failure"," — eroded or compacted seals leak isolation-critical flow",[135,148,149,152],{},[60,150,151],{},"Blade fouling"," — distorts the designed flow pattern and creates uneven distribution",[135,154,155,158],{},[60,156,157],{},"Slow stroke time"," — fouled actuators or guides take longer to operate than design",[127,160,162],{"id":161},"sonic-horns-on-damper-areas","Sonic horns on damper areas",[57,164,165,170],{},[166,167,169],"a",{"href":168},"\u002Fglossary\u002Fsonic-horn","Sonic horns"," installed adjacent to damper assemblies help keep blade and seal areas clear of accumulating particulate, preserving stroke time and isolation integrity. This is particularly valuable on HRSG diverter dampers where slow stroke time delays plant start-up.",[127,172,174],{"id":173},"related-terms","Related terms",[132,176,177,183,189,195],{},[135,178,179],{},[166,180,182],{"href":181},"\u002Fglossary\u002Fheat-recovery-steam-generator","Heat Recovery Steam Generator (HRSG)",[135,184,185],{},[166,186,188],{"href":187},"\u002Fglossary\u002Fcombined-cycle-gas-turbine","Combined-cycle gas turbine (CCGT)",[135,190,191],{},[166,192,194],{"href":193},"\u002Fglossary\u002Fid-fan","ID fan \u002F FD fan \u002F PA fan",[135,196,197],{},[166,198,199],{"href":168},"Sonic horn",{"title":201,"searchDepth":202,"depth":202,"links":203},"",2,[204,205,206],{"id":129,"depth":202,"text":130},{"id":161,"depth":202,"text":162},{"id":173,"depth":202,"text":174},"hrsg-gas-path","Dampers route, isolate or modulate flue-gas flow inside industrial ducting. Three principal types appear in power and process plants:","md",{},true,"\u002Fglossary\u002Fdiverter-damper-louver-damper-guillotine-damper",[214,215,216,217],"heat-recovery-steam-generator","combined-cycle-gas-turbine","id-fan","sonic-horn",{"title":219,"description":220},"Diverter, louver and guillotine dampers — gas-flow isolation and routing","Dampers route, isolate or modulate flue-gas flow. Diverter dampers swing flow between paths; louvers throttle; guillotines fully isolate. Fouling causes sticking, seal failure and bypass.",[222],{"title":223,"url":224},"Wikipedia — Damper (flow)","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDamper_(flow)","glossary\u002Fdiverter-damper-louver-damper-guillotine-damper","Diverter, louver and guillotine dampers","4pQAJJt905-8psjiigx6wLDPJUPYzmURQ1L1dOSC0x8",[229,356,436,598],{"id":230,"title":182,"aliases":231,"body":234,"category":207,"description":337,"extension":209,"meta":338,"navigation":211,"path":181,"relatedTerms":339,"seo":343,"sources":346,"stem":353,"term":354,"__hash__":355},"glossary\u002Fglossary\u002Fheat-recovery-steam-generator.md",[232,233],"HRSG","heat-recovery steam generator",{"type":54,"value":235,"toc":331},[236,246,250,258,262,265,294,298,303,305],[57,237,238,239,241,242,245],{},"A ",[60,240,182],{}," recovers heat from the exhaust of a gas turbine to generate steam — the second cycle of a ",[166,243,244],{"href":187},"combined-cycle gas turbine (CCGT)"," power plant. HRSGs raise overall plant efficiency from the ~38% of a simple-cycle gas turbine to 55–62% of a modern combined-cycle plant.",[127,247,249],{"id":248},"hrsg-layout","HRSG layout",[57,251,252,253,257],{},"A typical HRSG contains multiple ",[166,254,256],{"href":255},"\u002Fglossary\u002Ffinned-tube-harp-tube","finned-tube"," tube banks arranged in series along the gas-path direction: superheaters, evaporators, economisers, and (on units with SCR) the catalyst layers. Modern HRSGs operate at three pressure levels (HP, IP, LP) to maximise energy recovery from the cooling exhaust gas.",[127,259,261],{"id":260},"fouling","Fouling",[57,263,264],{},"HRSG fouling is generally lighter than coal-fired boiler fouling because gas-turbine exhaust contains far less particulate. The dominant fouling mechanisms are:",[132,266,267,276,282,288],{},[135,268,269,275],{},[60,270,271],{},[166,272,274],{"href":273},"\u002Fglossary\u002Fammonium-bisulphate","Ammonium bisulphate (ABS)"," on units with SCR — slipped ammonia + SO₃ from fuel sulphur condenses on finned tubes",[135,277,278,281],{},[60,279,280],{},"Fine ash deposition"," on finned-tube banks reducing heat transfer",[135,283,284,287],{},[60,285,286],{},"Duct-burner-driven"," particulate on units with supplementary firing",[135,289,290,293],{},[60,291,292],{},"Cold-end corrosion"," below the acid dew point on sulphur-bearing fuels",[127,295,297],{"id":296},"cleaning","Cleaning",[57,299,300,302],{},[166,301,169],{"href":168}," installed across the gas path are increasingly common on HRSG maintenance plans, particularly for keeping SCR catalyst layers and cold-end finned tubes clear of ABS without the need for offline water-wash campaigns.",[127,304,174],{"id":173},[132,306,307,311,316,322,327],{},[135,308,309],{},[166,310,188],{"href":187},[135,312,313],{},[166,314,315],{"href":255},"Finned tube \u002F harp tube",[135,317,318],{},[166,319,321],{"href":320},"\u002Fglossary\u002Fduct-burner","Duct burner",[135,323,324],{},[166,325,326],{"href":273},"Ammonium bisulphate",[135,328,329],{},[166,330,199],{"href":168},{"title":201,"searchDepth":202,"depth":202,"links":332},[333,334,335,336],{"id":248,"depth":202,"text":249},{"id":260,"depth":202,"text":261},{"id":296,"depth":202,"text":297},{"id":173,"depth":202,"text":174},"A Heat Recovery Steam Generator (HRSG) recovers heat from the exhaust of a gas turbine to generate steam — the second cycle of a combined-cycle gas turbine (CCGT) power plant. HRSGs raise overall plant efficiency from the ~38% of a simple-cycle gas turbine to 55–62% of a modern combined-cycle plant.",{},[215,340,341,342,217],"finned-tube-harp-tube","duct-burner","ammonium-bisulphate",{"title":344,"description":345},"Heat Recovery Steam Generator (HRSG) — convert gas-turbine exhaust to steam","An HRSG recovers heat from a gas turbine's exhaust to generate steam, the second cycle of a combined-cycle plant. Finned-tube ash deposition and ABS fouling are the main cleaning concerns.",[347,350],{"title":348,"url":349},"Wikipedia — Heat recovery steam generator","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FHeat_recovery_steam_generator",{"title":351,"url":352},"Combined Cycle Journal — Clean HRSG heat-transfer surfaces","https:\u002F\u002Fwww.ccj-online.com\u002Fclean-heat-transfer-surfaces-inside-and-out-to-keep-hrsgs-at-peak-efficiency\u002F","glossary\u002Fheat-recovery-steam-generator","Heat Recovery Steam Generator","2QpNZZDCPIfd-x3tx7w8wKqru7_s0rVDnW6E_FXNJVw",{"id":357,"title":188,"aliases":358,"body":362,"category":207,"description":421,"extension":209,"meta":422,"navigation":211,"path":187,"relatedTerms":423,"seo":426,"sources":429,"stem":433,"term":434,"__hash__":435},"glossary\u002Fglossary\u002Fcombined-cycle-gas-turbine.md",[359,360,361],"CCGT","combined cycle","combined-cycle plant",{"type":54,"value":363,"toc":416},[364,372,376,385,389,392,394],[57,365,238,366,368,369,371],{},[60,367,244],{}," plant combines a gas turbine with a steam turbine driven by an ",[166,370,232],{"href":181}," that recovers heat from the gas-turbine exhaust. The arrangement raises overall plant efficiency from ~38% LHV for a simple-cycle gas turbine to 55–62% LHV for modern CCGT, with the latest H-class machines pushing 64%+.",[127,373,375],{"id":374},"why-hrsg-cleanliness-matters","Why HRSG cleanliness matters",[57,377,378,379,381,382,384],{},"CCGT plants are economically dispatched ahead of coal in most markets, but margins per MWh are tight and competition from renewables intensifies the focus on heat rate. Every 0.5% efficiency loss from HRSG fouling translates directly to fuel cost. ",[166,380,169],{"href":168}," on the ",[166,383,232],{"href":181}," gas path are increasingly part of the standard maintenance toolkit on modern combined-cycle plants.",[127,386,388],{"id":387},"cycling-adds-complication","Cycling adds complication",[57,390,391],{},"Modern CCGT plants increasingly two-shift — running daytime and shutting overnight when renewable supply meets demand. Frequent start-stop cycling worsens HRSG fouling because cold metal surfaces during shutdowns condense moisture that bonds dust into a harder deposit. Continuous sonic-horn cleaning helps offset cycling-driven fouling acceleration.",[127,393,174],{"id":173},[132,395,396,400,404,410],{},[135,397,398],{},[166,399,182],{"href":181},[135,401,402],{},[166,403,321],{"href":320},[135,405,406],{},[166,407,409],{"href":408},"\u002Fglossary\u002Fselective-catalytic-reduction","Selective Catalytic Reduction (SCR)",[135,411,412],{},[166,413,415],{"href":414},"\u002Fglossary\u002Fheat-rate","Heat rate",{"title":201,"searchDepth":202,"depth":202,"links":417},[418,419,420],{"id":374,"depth":202,"text":375},{"id":387,"depth":202,"text":388},{"id":173,"depth":202,"text":174},"A combined-cycle gas turbine (CCGT) plant combines a gas turbine with a steam turbine driven by an HRSG that recovers heat from the gas-turbine exhaust. The arrangement raises overall plant efficiency from ~38% LHV for a simple-cycle gas turbine to 55–62% LHV for modern CCGT, with the latest H-class machines pushing 64%+.",{},[214,341,424,425],"selective-catalytic-reduction","heat-rate",{"title":427,"description":428},"Combined-cycle gas turbine (CCGT) — gas turbine plus HRSG and steam turbine","A CCGT plant combines a gas turbine with a steam turbine driven by an HRSG recovering exhaust heat. Plant efficiency reaches 55–62% LHV; HRSG cleanliness is critical.",[430],{"title":431,"url":432},"Wikipedia — Combined cycle power plant","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FCombined_cycle_power_plant","glossary\u002Fcombined-cycle-gas-turbine","Combined-cycle gas turbine","by8SpjeEI8ON6lFVMPJSYZgoB4OvOKZUqmCtbhUvCds",{"id":437,"title":194,"aliases":438,"body":445,"category":207,"description":449,"extension":209,"meta":584,"navigation":211,"path":193,"relatedTerms":585,"seo":588,"sources":591,"stem":595,"term":596,"__hash__":597},"glossary\u002Fglossary\u002Fid-fan.md",[439,440,441,442,443,444],"induced draft fan","forced draft fan","primary air fan","ID fan","FD fan","PA fan",{"type":54,"value":446,"toc":579},[447,450,519,523,543,551,555,560,562],[57,448,449],{},"Industrial boilers use three principal fans to manage gas and air movement:",[65,451,452,464],{},[68,453,454],{},[71,455,456,459,461],{},[74,457,458],{},"Fan",[74,460,79],{},[74,462,463],{},"Location",[84,465,466,493,506],{},[71,467,468,473,480],{},[89,469,470],{},[60,471,472],{},"ID (Induced Draft)",[89,474,475,476],{},"Pulls flue gas through the ",[166,477,479],{"href":478},"\u002Fglossary\u002Fconvective-pass-backpass","convective pass",[89,481,482,483,487,488,492],{},"Downstream of the ",[166,484,486],{"href":485},"\u002Fglossary\u002Felectrostatic-precipitator","ESP"," or ",[166,489,491],{"href":490},"\u002Fglossary\u002Fbaghouse","baghouse",", before the stack",[71,494,495,500,503],{},[89,496,497],{},[60,498,499],{},"FD (Forced Draft)",[89,501,502],{},"Pushes combustion air into the burners",[89,504,505],{},"Ahead of the air heater air-side inlet",[71,507,508,513,516],{},[89,509,510],{},[60,511,512],{},"PA (Primary Air)",[89,514,515],{},"Conveys pulverised coal from mills to burners",[89,517,518],{},"Between the coal mills and the burner deck",[127,520,522],{"id":521},"why-fans-foul","Why fans foul",[132,524,525,531,537],{},[135,526,527,530],{},[60,528,529],{},"Fly-ash deposition on ID fan blades"," unbalances the impeller, causing vibration and bearing wear",[135,532,533,536],{},[60,534,535],{},"PA fan blade build-up"," from sticky coal fines",[135,538,539,542],{},[60,540,541],{},"FD fan inlet vane fouling"," from atmospheric dust accumulating on the air-intake filter or vane assembly",[57,544,545,546,550],{},"ID fans on coal-fired and ",[166,547,549],{"href":548},"\u002Fglossary\u002Fwaste-to-energy","biomass"," plants are particularly prone to blade fouling; a trip-causing imbalance is a regular outage risk.",[127,552,554],{"id":553},"sonic-horns-on-fan-housings","Sonic horns on fan housings",[57,556,557,559],{},[166,558,169],{"href":168}," installed on the upstream ducting and at the fan inlet keep the blades clean by preventing the dust from settling onto them in the first place. Cement preheater ID fans are a particularly common installation.",[127,561,174],{"id":173},[132,563,564,570,575],{},[135,565,566],{},[166,567,569],{"href":568},"\u002Fglossary\u002Fboiler","Boiler",[135,571,572],{},[166,573,574],{"href":478},"Convective pass \u002F backpass",[135,576,577],{},[166,578,199],{"href":168},{"title":201,"searchDepth":202,"depth":202,"links":580},[581,582,583],{"id":521,"depth":202,"text":522},{"id":553,"depth":202,"text":554},{"id":173,"depth":202,"text":174},{},[586,587,217],"boiler","convective-pass-backpass",{"title":589,"description":590},"ID, FD and PA fans — the three principal boiler fans explained","Boilers use three fans: ID (induced draft) pulls flue gas through the convective pass, FD (forced draft) pushes combustion air, PA (primary air) conveys pulverised coal to the burners.",[592],{"title":593,"url":594},"Wikipedia — Boiler","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FBoiler","glossary\u002Fid-fan","ID, FD and PA fans","YjfqFgTbzrQzwlPIf72ZoVKgmffznjVyqIloOT6aaMo",{"id":599,"title":199,"aliases":600,"body":604,"category":808,"description":809,"extension":209,"meta":810,"navigation":211,"path":168,"relatedTerms":811,"seo":818,"sources":821,"stem":831,"term":199,"__hash__":832},"glossary\u002Fglossary\u002Fsonic-horn.md",[601,602,603],"sonic horns","sonic cleaning horn","industrial sonic horn",{"type":54,"value":605,"toc":801},[606,638,642,650,654,716,720,757,761,769,771],[57,607,238,608,611,612,616,617,620,621,620,625,620,628,632,633,637],{},[60,609,610],{},"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 ",[166,613,615],{"href":614},"\u002Fglossary\u002Facoustic-cleaner","acoustic cleaner"," and the default specification for cleaning ",[166,618,619],{"href":485},"ESPs",", ",[166,622,624],{"href":623},"\u002Fglossary\u002Ffabric-filter","baghouses",[166,626,627],{"href":408},"SCR catalysts",[166,629,631],{"href":630},"\u002Fglossary\u002Fsuperheater","boiler heat-transfer surfaces"," and ",[166,634,636],{"href":635},"\u002Fglossary\u002Fhopper","hoppers and silos",".",[127,639,641],{"id":640},"how-a-sonic-horn-works","How a sonic horn works",[57,643,644,645,649],{},"Compressed plant air admitted through a ",[166,646,648],{"href":647},"\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.",[127,651,653],{"id":652},"key-parameters","Key parameters",[65,655,656,666],{},[68,657,658],{},[71,659,660,663],{},[74,661,662],{},"Parameter",[74,664,665],{},"Typical range",[84,667,668,676,684,692,700,708],{},[71,669,670,673],{},[89,671,672],{},"Fundamental frequency",[89,674,675],{},"60–400 Hz",[71,677,678,681],{},[89,679,680],{},"Sound pressure level",[89,682,683],{},"140–180 dB",[71,685,686,689],{},[89,687,688],{},"Compressed-air consumption",[89,690,691],{},"8–14 Nm³\u002Fmin at 4–7 bar",[71,693,694,697],{},[89,695,696],{},"Operating temperature (with appropriate materials)",[89,698,699],{},"−40 °C to +500 °C",[71,701,702,705],{},[89,703,704],{},"Firing cycle",[89,706,707],{},"5–15 s burst, repeated every 3–15 minutes",[71,709,710,713],{},[89,711,712],{},"Mass",[89,714,715],{},"15–60 kg depending on horn size",[127,717,719],{"id":718},"frequency-selection","Frequency selection",[57,721,722,723,620,727,731,732,620,736,740,741,620,744,748,749,632,753,637],{},"Lower frequencies (60–125 Hz) project longer wavelengths and penetrate further into large open vessels — ",[166,724,726],{"href":725},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones",[166,728,730],{"href":729},"\u002Fglossary\u002Frecovery-boiler","recovery-boiler superheaters",", large ",[166,733,735],{"href":734},"\u002Fglossary\u002Fesp-field-bus-section","ESP fields",[166,737,739],{"href":738},"\u002Fglossary\u002Fsilo","silos",". Higher frequencies (230–400 Hz) carry more energy per unit volume and suit finer dust loads in ",[166,742,743],{"href":623},"fabric-filter compartments",[166,745,747],{"href":746},"\u002Fglossary\u002Fhoneycomb-catalyst","catalyst layers"," and smaller hopper geometries. See ",[166,750,752],{"href":751},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","low-frequency acoustic cleaner",[166,754,756],{"href":755},"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner","high-frequency acoustic cleaner",[127,758,760],{"id":759},"sonic-horn-vs-steam-sootblower","Sonic horn vs steam sootblower",[57,762,763,764,768],{},"Sonic horns are increasingly specified alongside or in place of ",[166,765,767],{"href":766},"\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.",[127,770,174],{"id":173},[132,772,773,778,784,790,796],{},[135,774,775],{},[166,776,777],{"href":614},"Acoustic cleaner",[135,779,780],{},[166,781,783],{"href":782},"\u002Fglossary\u002Fsonic-sootblower","Sonic sootblower",[135,785,786],{},[166,787,789],{"href":788},"\u002Fglossary\u002Fbell-horn","Bell horn",[135,791,792],{},[166,793,795],{"href":794},"\u002Fglossary\u002Fdiaphragm-horn","Diaphragm horn",[135,797,798],{},[166,799,800],{"href":751},"Low-frequency acoustic cleaner",{"title":201,"searchDepth":202,"depth":202,"links":802},[803,804,805,806,807],{"id":640,"depth":202,"text":641},{"id":652,"depth":202,"text":653},{"id":718,"depth":202,"text":719},{"id":759,"depth":202,"text":760},{"id":173,"depth":202,"text":174},"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.",{},[812,813,814,815,816,817],"acoustic-cleaner","acoustic-cleaning-system","sonic-sootblower","bell-horn","diaphragm-horn","low-frequency-acoustic-cleaner",{"title":819,"description":820},"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.",[822,825,828],{"title":823,"url":824},"Power Engineering — Sonic Horns: A User's Introduction","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Fsonic-horns-a-userrsquos-introduction\u002F",{"title":826,"url":827},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F",{"title":829,"url":830},"Wikipedia — Sonic soot blowers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSonic_soot_blowers","glossary\u002Fsonic-horn","YzrhN0kKzqSaQo0wfn0rueNZ-V43mcg5zahqeWi3lnU",1782613742186]