[{"data":1,"prerenderedAt":684},["ShallowReactive",2],{"site-footer-common":3,"glossary:esp-field-bus-section":45,"glossary-related:esp-field-bus-section":205},{"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":185,"description":186,"extension":187,"meta":188,"navigation":189,"path":190,"relatedTerms":191,"seo":196,"sources":199,"stem":203,"term":62,"__hash__":204},"glossary\u002Fglossary\u002Fesp-field-bus-section.md","ESP field \u002F bus section",[49,50,51],"bus section","ESP bus section","electrical field (ESP)",{"type":53,"value":54,"toc":178},"minimark",[55,84,89,133,136,140,148,152],[56,57,58,59,63,64,67,68,73,74,78,79,83],"p",{},"An ",[60,61,62],"strong",{},"ESP field"," (also called a ",[65,66,49],"em",{},") is an independently energised electrical zone of an ",[69,70,72],"a",{"href":71},"\u002Fglossary\u002Felectrostatic-precipitator","ESP",", with its own transformer-rectifier (T-R) set, ",[69,75,77],{"href":76},"\u002Fglossary\u002Fdischarge-electrode","discharge electrodes",", and ",[69,80,82],{"href":81},"\u002Fglossary\u002Fesp-rapper","rapper"," group. Large ESPs are built up from multiple fields in series along the gas-flow direction.",[85,86,88],"h2",{"id":87},"typical-configuration","Typical configuration",[90,91,92,105],"table",{},[93,94,95],"thead",{},[96,97,98,102],"tr",{},[99,100,101],"th",{},"Configuration",[99,103,104],{},"Use case",[106,107,108,117,125],"tbody",{},[96,109,110,114],{},[111,112,113],"td",{},"3 fields in series",[111,115,116],{},"Small industrial ESPs",[96,118,119,122],{},[111,120,121],{},"4–5 fields in series",[111,123,124],{},"Coal-fired utility boilers, cement kilns",[96,126,127,130],{},[111,128,129],{},"6+ fields",[111,131,132],{},"Strict particulate limits, low-sulphur coal, WtE tail-end",[56,134,135],{},"Fields are numbered from inlet to outlet. The inlet field sees the highest dust load and works hardest; the outlet field handles the residual particulate and runs near maximum sustainable voltage.",[85,137,139],{"id":138},"why-fields-matter-for-cleaning","Why fields matter for cleaning",[56,141,142,143,147],{},"Each field is electrically independent: a sparking or back-corona-suppressed field can be isolated without shutting down the whole ESP. Dust load also differs along the gas path — inlet fields need aggressive cleaning, outlet fields less so. Multi-zone ",[69,144,146],{"href":145},"\u002Fglossary\u002Fsonic-horn","sonic-horn"," sequencing groups horns by field and matches firing intensity to local fouling.",[85,149,151],{"id":150},"related-terms","Related terms",[153,154,155,161,167,172],"ul",{},[156,157,158],"li",{},[69,159,160],{"href":71},"Electrostatic precipitator",[156,162,163],{},[69,164,166],{"href":165},"\u002Fglossary\u002Fcollecting-electrode","Collecting electrode",[156,168,169],{},[69,170,171],{"href":76},"Discharge electrode",[156,173,174],{},[69,175,177],{"href":176},"\u002Fglossary\u002Fcorona-discharge","Corona discharge",{"title":179,"searchDepth":180,"depth":180,"links":181},"",2,[182,183,184],{"id":87,"depth":180,"text":88},{"id":138,"depth":180,"text":139},{"id":150,"depth":180,"text":151},"esp","An ESP field (also called a bus section) is an independently energised electrical zone of an ESP, with its own transformer-rectifier (T-R) set, discharge electrodes, and rapper group. Large ESPs are built up from multiple fields in series along the gas-flow direction.","md",{},true,"\u002Fglossary\u002Fesp-field-bus-section",[192,193,194,195],"electrostatic-precipitator","collecting-electrode","discharge-electrode","corona-discharge",{"title":197,"description":198},"ESP field — independent electrical zones inside a precipitator","An ESP field (or bus section) is an independently energised electrical zone of an ESP, with its own transformer-rectifier set, discharge electrodes and rapper group.",[200],{"title":201,"url":202},"EPA — Monitoring Knowledge Base: Electrostatic Precipitators","https:\u002F\u002Fwww.epa.gov\u002Fair-emissions-monitoring-knowledge-base\u002Fmonitoring-control-technique-electrostatic-precipitators","glossary\u002Fesp-field-bus-section","Ulyq6NyPD-duv25fKdcnKiAxKYrOoUs9PWnwzQ4bCco",[206,375,480,578],{"id":207,"title":208,"aliases":209,"body":212,"category":185,"description":356,"extension":187,"meta":357,"navigation":189,"path":71,"relatedTerms":358,"seo":362,"sources":365,"stem":373,"term":160,"__hash__":374},"glossary\u002Fglossary\u002Felectrostatic-precipitator.md","Electrostatic precipitator (ESP)",[72,210,211],"electrostatic precipitators","dry ESP",{"type":53,"value":213,"toc":350},[214,229,233,247,251,287,291,323,325],[56,215,58,216,219,220,224,225,228],{},[60,217,218],{},"electrostatic precipitator (ESP)"," is an air-pollution-control device that removes particulate matter from a flue-gas stream by electrostatically charging dust particles and collecting them on grounded plate electrodes. ESPs are the dominant particulate-control technology on coal-fired boilers, cement kilns, ",[69,221,223],{"href":222},"\u002Fglossary\u002Fwaste-to-energy","waste-to-energy"," plants, ",[69,226,227],{"href":222},"biomass"," plants, sinter strands and many other heavy-industry off-gas streams.",[85,230,232],{"id":231},"how-an-esp-works","How an ESP works",[56,234,235,236,239,240,242,243,246],{},"Flue gas flows horizontally between a parallel array of vertical ",[69,237,238],{"href":165},"collecting electrodes"," (plates) and ",[69,241,77],{"href":76}," (high-voltage wires or rigid spikes). A negative DC potential of 40–80 kV applied to the discharge electrodes generates a ",[69,244,245],{"href":176},"corona discharge"," that ionises the gas. Charged dust particles drift to the collecting plates, accumulate as a dust layer, are rapped down into hoppers below and removed by ash-handling equipment.",[85,248,250],{"id":249},"where-sonic-horns-fit","Where sonic horns fit",[56,252,253,254,258,259,262,263,267,268,271,272,276,277,281,282,286],{},"ESPs accumulate dust faster than mechanical rapping can release it, and hoppers below ESP fields routinely ",[69,255,257],{"href":256},"\u002Fglossary\u002Fbridging","bridge"," and choke. ",[69,260,261],{"href":145},"Sonic horns"," installed on the ESP ",[69,264,266],{"href":265},"\u002Fglossary\u002Fesp-penthouse","penthouse"," and on hopper walls keep dust dislodged, supplement ",[69,269,270],{"href":81},"rappers",", prevent ",[69,273,275],{"href":274},"\u002Fglossary\u002Fback-corona","back-corona"," by limiting plate dust thickness, and eliminate hopper ",[69,278,280],{"href":279},"\u002Fglossary\u002Frat-holing","rat-holing"," without the structural fatigue of ",[69,283,285],{"href":284},"\u002Fglossary\u002Ftumbling-hammer-rapper","tumbling-hammer rappers",".",[85,288,290],{"id":289},"common-failure-modes","Common failure modes",[153,292,293,299,305,311,317],{},[156,294,295,298],{},[60,296,297],{},"High opacity \u002F particulate emissions"," from thick dust layers reducing collection efficiency",[156,300,301,304],{},[60,302,303],{},"Back-corona"," in high-resistivity ash that reverses ionisation and collapses collection",[156,306,307,310],{},[60,308,309],{},"Re-entrainment"," as rapper puffs return dust to the gas stream",[156,312,313,316],{},[60,314,315],{},"Hopper bridging"," that stops ash extraction and triggers field shutdowns",[156,318,319,322],{},[60,320,321],{},"Discharge-electrode breakage"," from rapper fatigue or sparking",[85,324,151],{"id":150},[153,326,327,331,335,339,345],{},[156,328,329],{},[69,330,166],{"href":165},[156,332,333],{},[69,334,171],{"href":76},[156,336,337],{},[69,338,303],{"href":274},[156,340,341],{},[69,342,344],{"href":343},"\u002Fglossary\u002Fesp-hopper","ESP hopper",[156,346,347],{},[69,348,349],{"href":145},"Sonic horn",{"title":179,"searchDepth":180,"depth":180,"links":351},[352,353,354,355],{"id":231,"depth":180,"text":232},{"id":249,"depth":180,"text":250},{"id":289,"depth":180,"text":290},{"id":150,"depth":180,"text":151},"An electrostatic precipitator (ESP) is an air-pollution-control device that removes particulate matter from a flue-gas stream by electrostatically charging dust particles and collecting them on grounded plate electrodes. ESPs are the dominant particulate-control technology on coal-fired boilers, cement kilns, waste-to-energy plants, biomass plants, sinter strands and many other heavy-industry off-gas streams.",{},[359,193,194,195,360,361,275,146],"wet-esp","esp-hopper","esp-rapper",{"title":363,"description":364},"Electrostatic precipitator (ESP) — how it works and how it fouls","An ESP removes particulate from flue gas by charging dust and collecting it on plate electrodes. Sonic horns are widely used to dislodge ash from plates and to keep hoppers from bridging.",[366,369,370],{"title":367,"url":368},"Wikipedia — Electrostatic precipitator","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FElectrostatic_precipitator",{"title":201,"url":202},{"title":371,"url":372},"Babcock & Wilcox — Basics of ESP Operation","https:\u002F\u002Fwww.babcock.com\u002Fhome\u002Fabout\u002Fresources\u002Flearning-center\u002Fbasic-esp-operation","glossary\u002Felectrostatic-precipitator","hT_C4hmid3iZaYWhLpiSJ2tBfL0bSJ-uhzn7TY4Vtj4",{"id":376,"title":166,"aliases":377,"body":381,"category":185,"description":470,"extension":187,"meta":471,"navigation":189,"path":165,"relatedTerms":472,"seo":473,"sources":476,"stem":478,"term":166,"__hash__":479},"glossary\u002Fglossary\u002Fcollecting-electrode.md",[378,379,380],"collecting plate","collection plate","ESP plate",{"type":53,"value":382,"toc":464},[383,394,398,420,424,432,436,439,441],[56,384,385,386,389,390,393],{},"The ",[60,387,388],{},"collecting electrode"," — usually called the \"collecting plate\" in plate-type ESPs — is the grounded surface on which charged particulate accumulates inside an ",[69,391,392],{"href":71},"electrostatic precipitator",". Collecting plates are typically 9–15 m tall, rolled or profiled steel sections with stiffening pockets, hung in parallel rows 250–400 mm apart.",[85,395,397],{"id":396},"how-dust-accumulates-and-releases","How dust accumulates and releases",[56,399,400,401,404,405,407,408,411,412,415,416,419],{},"Charged particles migrate from the ",[69,402,403],{"href":76},"discharge electrode"," towards the grounded plate, transfer their charge and adhere as a dust layer. The layer must be released regularly: too thick and it raises plate-face voltage, reducing the field, eventually triggering ",[69,406,275],{"href":274},". Release is achieved by ",[69,409,410],{"href":81},"rapping"," (mechanical impact) or ",[69,413,414],{"href":145},"sonic horns"," (acoustic vibration), with the released dust sheet falling into the ",[69,417,418],{"href":343},"hopper"," below.",[85,421,423],{"id":422},"the-re-entrainment-problem","The re-entrainment problem",[56,425,426,427,431],{},"Aggressive rapping releases dust faster than the hopper can swallow it, and some of the falling sheet is caught back up by the gas stream — this is ",[69,428,430],{"href":429},"\u002Fglossary\u002Fre-entrainment","re-entrainment",", and it shows up as periodic opacity spikes on stack CEMS traces. Sonic horns produce gentler, more continuous release that reduces re-entrainment compared to mechanical rapping alone.",[85,433,435],{"id":434},"profile-types","Profile types",[56,437,438],{},"Collecting plates come in many profiled forms (CW, ZT, ECO, Opzel, baffle, etc.), each chosen to balance electrical performance against dust-release behaviour. Specialist ESP vendors (B&W, FLSmidth, Hamon, Mitsubishi) supply matched plate-and-rapping packages.",[85,440,151],{"id":150},[153,442,443,447,451,456,460],{},[156,444,445],{},[69,446,160],{"href":71},[156,448,449],{},[69,450,171],{"href":76},[156,452,453],{},[69,454,455],{"href":81},"ESP rapper",[156,457,458],{},[69,459,349],{"href":145},[156,461,462],{},[69,463,309],{"href":429},{"title":179,"searchDepth":180,"depth":180,"links":465},[466,467,468,469],{"id":396,"depth":180,"text":397},{"id":422,"depth":180,"text":423},{"id":434,"depth":180,"text":435},{"id":150,"depth":180,"text":151},"The collecting electrode — usually called the \"collecting plate\" in plate-type ESPs — is the grounded surface on which charged particulate accumulates inside an electrostatic precipitator. Collecting plates are typically 9–15 m tall, rolled or profiled steel sections with stiffening pockets, hung in parallel rows 250–400 mm apart.",{},[192,194,361,146,430],{"title":474,"description":475},"Collecting electrode (ESP plate) — function, fouling and cleaning","The collecting electrode is the grounded plate or tube on which charged particulate accumulates inside an ESP. Dust must be released to hoppers without re-entraining into the gas stream.",[477],{"title":371,"url":372},"glossary\u002Fcollecting-electrode","9E4jLiOYVWf0Kj-hlJN58FMZ0Nz2mF0Iv1OuBtFwtqM",{"id":481,"title":171,"aliases":482,"body":487,"category":185,"description":568,"extension":187,"meta":569,"navigation":189,"path":76,"relatedTerms":570,"seo":571,"sources":574,"stem":576,"term":171,"__hash__":577},"glossary\u002Fglossary\u002Fdischarge-electrode.md",[483,484,485,486],"emitting electrode","corona electrode","discharge wire","rigid discharge electrode",{"type":53,"value":488,"toc":563},[489,505,509,512,529,533,539,541],[56,490,385,491,493,494,496,497,499,500,502,503,286],{},[60,492,403],{}," (also called the ",[60,495,483],{},") is the high-voltage element inside an ",[69,498,392],{"href":71}," that generates the ",[69,501,245],{"href":176},". It is energised at 40–80 kV DC negative relative to the grounded ",[69,504,238],{"href":165},[85,506,508],{"id":507},"geometry","Geometry",[56,510,511],{},"Two families dominate:",[153,513,514,523],{},[156,515,516,519,520,522],{},[60,517,518],{},"Wire electrodes"," — fine spiral or barbed wires, typically weighted at the bottom and suspended from a top frame. Lightweight; easy to retrofit; prone to fatigue and breakage under ",[69,521,410],{"href":81}," impacts.",[156,524,525,528],{},[60,526,527],{},"Rigid discharge electrodes (RDE)"," — pipe or mast sections with formed spikes or points. Used in modern American-style and rigid-frame ESPs. More robust against rapper breakage but heavier.",[85,530,532],{"id":531},"fouling-on-discharge-electrodes","Fouling on discharge electrodes",[56,534,535,536,538],{},"Just like the collecting plates, discharge electrodes accumulate dust. A thick coating on a wire or RDE reduces the local field gradient, suppresses corona, and lowers collection efficiency. The cleaning challenge is geometrically harder than for plates — discharge electrodes are point or line sources surrounded by gas. ",[69,537,261],{"href":145}," addressing the whole field volume help dislodge dust from discharge electrodes as well as from plates.",[85,540,151],{"id":150},[153,542,543,547,551,555,559],{},[156,544,545],{},[69,546,160],{"href":71},[156,548,549],{},[69,550,166],{"href":165},[156,552,553],{},[69,554,177],{"href":176},[156,556,557],{},[69,558,303],{"href":274},[156,560,561],{},[69,562,349],{"href":145},{"title":179,"searchDepth":180,"depth":180,"links":564},[565,566,567],{"id":507,"depth":180,"text":508},{"id":531,"depth":180,"text":532},{"id":150,"depth":180,"text":151},"The discharge electrode (also called the emitting electrode) is the high-voltage element inside an electrostatic precipitator that generates the corona discharge. It is energised at 40–80 kV DC negative relative to the grounded collecting electrodes.",{},[192,193,195,275,146],{"title":572,"description":573},"Discharge electrode — the high-voltage emitter inside an ESP","The discharge electrode is the high-voltage electrode that generates the corona discharge inside an ESP. Charged dust drifts from it to the collecting plates.",[575],{"title":367,"url":368},"glossary\u002Fdischarge-electrode","E8VJGt3XxJD7K99lsPd9v-FQlmpjndXP4FYfB-pqPJk",{"id":579,"title":177,"aliases":580,"body":583,"category":185,"description":672,"extension":187,"meta":673,"navigation":189,"path":176,"relatedTerms":674,"seo":675,"sources":678,"stem":682,"term":177,"__hash__":683},"glossary\u002Fglossary\u002Fcorona-discharge.md",[581,582],"corona (electrical)","negative corona",{"type":53,"value":584,"toc":667},[585,600,604,607,611,643,646,648],[56,586,587,588,590,591,593,594,596,597,599],{},"A ",[60,589,245],{}," is a self-sustaining electrical discharge that occurs when the field gradient around a sharp electrode exceeds the breakdown threshold of the surrounding gas. In an ",[69,592,72],{"href":71}," the corona forms around the ",[69,595,403],{"href":76},", ionises flue-gas molecules, and the resulting ions attach to dust particles. The charged particles then drift to the ",[69,598,238],{"href":165}," under the electric field.",[85,601,603],{"id":602},"negative-corona-dominates","Negative corona dominates",[56,605,606],{},"Industrial ESPs almost always run on negative corona because it sustains a higher voltage before sparking — but it also produces some ozone, which is one of the reasons WESPs in confined ventilation paths sometimes use positive corona instead.",[85,608,610],{"id":609},"what-disrupts-the-corona","What disrupts the corona",[153,612,613,619,631,637],{},[156,614,615,618],{},[60,616,617],{},"Excessive dust on the collecting plate"," — raises plate-face voltage, narrows the working gap",[156,620,621,628,629],{},[60,622,623,624],{},"High ash ",[69,625,627],{"href":626},"\u002Fglossary\u002Fresistivity","resistivity"," — traps charge in the dust layer, leading to ",[69,630,275],{"href":274},[156,632,633,636],{},[60,634,635],{},"Bent or broken discharge electrodes"," — local field collapse, sparking, eventual short",[156,638,639,642],{},[60,640,641],{},"Fouled discharge electrode tips"," — suppressed corona, reduced ion current",[56,644,645],{},"Acoustic cleaning addresses two of these (plate dust thickness and discharge-electrode fouling) without the broken-electrode risk of aggressive mechanical rapping.",[85,647,151],{"id":150},[153,649,650,654,658,662],{},[156,651,652],{},[69,653,160],{"href":71},[156,655,656],{},[69,657,171],{"href":76},[156,659,660],{},[69,661,303],{"href":274},[156,663,664],{},[69,665,666],{"href":626},"Resistivity (fly-ash)",{"title":179,"searchDepth":180,"depth":180,"links":668},[669,670,671],{"id":602,"depth":180,"text":603},{"id":609,"depth":180,"text":610},{"id":150,"depth":180,"text":151},"A corona discharge is a self-sustaining electrical discharge that occurs when the field gradient around a sharp electrode exceeds the breakdown threshold of the surrounding gas. In an ESP the corona forms around the discharge electrode, ionises flue-gas molecules, and the resulting ions attach to dust particles. The charged particles then drift to the collecting electrodes under the electric field.",{},[192,194,275,627],{"title":676,"description":677},"Corona discharge — the ionisation mechanism that powers an ESP","Corona discharge is the electrical breakdown around an ESP's discharge electrode that ionises gas molecules and charges dust particles for collection.",[679],{"title":680,"url":681},"Wikipedia — Corona discharge","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FCorona_discharge","glossary\u002Fcorona-discharge","dShpP0lym_kkFMbohrkUgv75_uA0O8qlKu9VJ1eimyA",1782613734982]