Plate heat exchanger hi heat exchange hmanrua chi khat a ni a, chu chuan heat exchange hmanrua dangte nena inmil thei lo hlawkna a nei a: heat transfer coefficient sang tak, heat loss loss hniam, footprint tlem, compact leh light structure, maintenance leh cleaning,plate heat exchanger te hian application hrang hrang an nei a, service life rei tak an nei bawk. Mahse, harsatna engemaw zat an nei bawk a, chu chu pressure 2.5mpa aia tam a ni thei lo va, temperature 250℃celsius aia tam a ni thei lo va, particle lian zawk leh fiber sei tak takte tan chuan lumna a inthleng thei lo va, hnathawhna hmun chhe lutukah pawh hman theih a ni lo va, clogging pawh a tam hle. A hnuaia tarlan te hi common abnormal phenomena of some common abnormal phenomena of 2019 atanga thlirletna a ni.Heat Exchangers te pawh a awm bawk.:
A chhan bulpui ber:
Heat exchange plate scaling/clogging: calcium leh magnesium ion leh fluid chhunga bawlhhlawh awmte chu plate chung lamah an dah a, thermal conductivity hniam tak nei scale layer an siam a Fluid Short Circuit: Plate sealing gaskets te hi an tar emaw, an misalign emaw a,hei hian tui lum leh lum thenkhat chu heat exchange nei lovin direct-in a inhmeh tir a Plate Channel Blockage: Fluid chhunga solid particle leh fibers (sewage leh slurry ang chi) te chu plate guide area emaw flow channel emaw ah an tang a, hei hian effective heat exchange area a ti tlem a ni.
Chhanna dik:
01
Chemical descaling (scaling atan):
Thil hmanrua chu titawp la, tui chu paih la, acidic cleaning agent chak lo tak (stainless steel plate-a corrosion loh nan 5%-8% citric acid solution ang chi) darkar 2-4 chhung flush la,
02
Chumi hnuah tui thianghlim hmangin neutral thlengin silfai la;scale layer chu a khauh chuan (calcium carbonate hard scale ang chi), darkar 1 chhung soak la, chutah chuan recirculate leh rawh.
03
Hydrochloric acid (plate passivation film awlsam taka tichhe thei) ang chi solutions corrosive tak tak hmang suh.
04
Taksa tihfai (block theihna tur):
Heat exchanger chu thenfai la, plate te chu la chhuak la, flow channel chu high-pressure water gun (plate te deformation loh nan 0.8mpa aia tlem emaw a tlukpui emaw) hmangin flow channel chu flush la
Core Reasons:Gasket Aging/Damage: Long-Term temperature sang leh pressure inthlak danglamna chuan gasket chu elasticity a hloh a, a nih loh leh fluid corrosion ( acidic fluid ang chi) chuan gasket chu a swell a, a crack a Plate deformation/misalignment: Assembly emaw long emaw laiin bolt te chu a inthlau lo-Term overpressure operation chuan plate warping leh loose sealing surface te a thlen thin Flange seal a chhiat dan: inlet leh outlet flange gasket te chu an upa a, a nih loh leh bolt te chu a lo chhuak a (hot leh cold hian bolt te chu a tizau a, a inzawm khawm a). Shutdown leakage hi a chhan ber chu heat exchanger-a bul tanna-up leh shutdown vang a ni a, hnathawh dan pangngai restoration a awm thei bawk Internal leakage hi gasket chhia leh plate corrosion leh perforation avanga lo awm a ni ber a;pawn lam atanga leak a nih chhan ber chu misalignment, extrusion, sealing gasket tihchhiat, corrosion leh plate deformation te, leh clamping size tarlan tawha tight loh te a ni Blind plate leh clamping plate inkar a leak chhan ber chu blind plate chu thil harsa tak takin a rawn chhuah tir a ni.
Solution:Emergency treatment: System pressure tihhniam nghal la, heat exchanger inlet leh outlet valve te khar nghal la (hot side kha khar hmasa la, chutah chuan a lum lam la), fluid chu drain la, shut down rawh Seal te chu thlak leh rawh: Heat exchanger chu disassemble la, gasket zawng zawng chu la chhuak la,Plate sealing groove chu scratch atan enfiah rawh (a awm chuan, sandpaper tha tak nen smooth rawh) Sealing gasket chu a chi khat hmanga thlak (heat-resistant leh corrosion-thil tuar thei, oil atan nitrile rubber leh EPDM for water/weak alkali ang chi) hman a tha a, rereassemble leh tight rawh: Plate-te chu original order-a stack (plate numbers chu reverse installation-a awm lo turin alignment a awm lo), bolts-te chu stresis-a awm lo turin a inzawm tlat a, chu chuan bolts-te chu a tifel a, chu chuan a ti tight a, chu chuan bolts-te chu a tifel a ni.
Heat exchanger-a inlet leh outlet pressure gauges inthlauhna chuan design value a pel (entir nan, design pressure chu 0.1mpa-in a tlahniam a, mahse pressure tak tak chu 0.3mpa-ah a tlahniam thung) pump outlet pressure a sang a, mahse a .Heat Exchanger 1000 a ni.Inlet flow rate a tlahniam (pum pump a overload a, noise a sang bawk).
Core Reasons:Flow Channel Blockage: Fluid-a bawlhhlawh awmte (sand leh rust ang chi) chu plate flow channel-ah a awm a, flow cross-sectional area a tihtlem a;Plate dik tak emaw, plate chi emaw dik lo: flow rate tak tak chuan design value aiin a tam zawk a, a nih loh leh plate flow channel chu a tawi lutuk (entirnan, channel plate te tak te chu flow rate lian tak fluid process nan hman a ni a (fluid entawntlak, fluid, the the fluid, the the the fluid, the the the fluid, the the the fluid, the the the the fluid Viscosity of oil hi temperature hniam takah a pung a), emaw, fluid hian suspended matter tam tak (slurry ang chi) a pai a, chu chuan flow resistance a tisang a ni.
Solution:Flow channel tifai rawh: Shing down hnuah heat exchanger chu disassemble la, plate flow channel chu high-pressure water gun hmangin flush la, a nih loh leh special ball (flow channel zau zawng aia te zawk diameter tlem zawk nei) hmangin blockage chu clear rawh Operating parameters siamrem rawh: flow rate a tam lutuk chuan pump frequency chu a remchan dan angin tihtlem la (design flow rate ±10% inkar ah control la) Fluid viscosity a san chuan fluid inlet temperature (oil chu viscosity range dik taka tihlum ang chi) tihsan la, a nih loh leh inlet-ah preheater dah rawh.
A:Hot side outlet temperature hi design value aiin a sang zawk. A chhan ber chu: selection problem, hot side flow rate chu design value aiin a tam zawk a, plate a block emaw, cold side flow rate a tlem emaw
B:Cold side outlet temperature a hniam lutuk. A chhan ber chu hot side flow tenau emaw, design value, plate blockage, etc. aia hniam emaw a ni.