THU H6| NHI$T KHOI THAI COA LO NUNG TUYNEL 0^ OUN Nl/(3C NONG ThS Nguyen Thanh Trung Vidn Khoa hge vS Ky thuSt Mdi tmdng Trudng Dai hgc XSy dung Tdm tit TSn dung nhipt khdi thai cda eSc Id nung tuynel[.]
THU H | NHI$T KHOI THAI COA LO NUNG TUYNEL 0^ OUN Nl/(3C NONG ThS Nguyen Thanh Trung Vidn Khoa hge vS Ky thuSt Mdi tmdng Trudng Dai hgc XSy dung Tdm tit: TSn dung nhipt khdi thai cda eSc Id nung tuynel IS mpt giii phSp ky thuSt dem lai hidu qua sit dung nSng lugng cao nhat Phuong thitc nSy dS dugc nhiiu eg sd di xuit vS Sp dung nhu mpt giii phSp hieu qua di tiit kidm nSng lugng eSc ngSnh sin xuit cdng nghidp ddng thdi dat duge ydu eiu vp sinh an toSn lao dpng BSi bao gidi thidu tinh toSn thiit bj trao dii nhidt dang ong ling di eung eip nude ndng eho cdng nhSn tmng nha may Summary: Heat recovery from exhaust fume of brick tuynel furnace is one of solution that could be able to utilize energy consumption This method is suggested and applied effectively by various enterprises to save energy in processing and archive mission of labour safety and sanitation The article aims to introduce the calculation of pipe heat recovery equipment in order to supply heat water for domestic purpose in the factories I.DATVANDE Odng trudc thach thdc v i can kidt ngudn ndng lupng hda thach, trdn the gidi cung nhu d Vidt Nam vin de tiit kidm ndng lupng dang trd myc tidu cda eae hoat ddng kinh t i ky thuat Trong qua trinh phat trien kinh te eua da't nude van d i sd dyng ndng lupng ed hidu qua dang Id ydu c i u kinh t i kinh t i ky thudt cd'p bach Chinh phd da ban hdnh Nghi dinh sd 102/2003/NO-CP ngdy 03 thdng ndm 2003 v i sd dung ndng lupng tiit kidm vd hidu qua, Bp Cdng thuong cung hudng dan sd dung ndng lupng tiet kidm vd hidu qua ddi vdi cac eo sd san xuit Nhidt thai Id mdt phan lupng nhidt phat sinh qud trinh ddt chdy nhidn lieu cda cac Id tuynel (siy - nung lien hodn) va dupe thai ngoai mdi trudng, ehdng cd the dupc tdi sd dung mdt each hdu ieh cho cdc nhu c i u ndng lupng khac Van d i chinh can quan tdm Id hidu qua vd y nghTa mdi trudng Co e h i de thu hdi nhidt thai phd thupc vdo nhidt dp cda khdi thai, ehi tidu kinh t i vd ITnh vye hoat ddng Hoat ddng eda cac Id nung thudng phdt sinh mdt lupng Idn khdi thai nhidt dp kha cao Niu mdt phin nhidt thai ndy dupc thu hdi thi cd the tiit kiem dupc mdt phan nhidn lidu d i u vdo Vide tdn dung nhidt thda eda khdi thai td cdc ngudn nhiet dde bidt cac Id siy - nung da duoe da dupe dp dyng nhiiu di sd dung chd y i u eho myc dieh san xud't md chua chu y d i n phuc vy vd sinh an todn lao ddng Bdi bdo ndy d i cdp din v i n de thu hdi nhiet thai Id nung tuynel di eip nude ndng phuc vy eho edng nhdn nhd mdy TAP CHf KHOA HOC CONG N G H $ X A Y DUNG sd3/2008 89 CAC THIET Bj THU HOI NHIET 2.1 Thiet bj thu hoi nhiet kieu tam quay Thiit bj ndy Id mdt dTa xdp Idn dupe lam bang chit lieu ed ndng suit nhidt kha cao va quay giua hai d'ng dat sat (hinhl): mpt d'ng khdng lanh va mdt d'ng khdi ndng True cda dTa dupe dat tren phan ngdn chia gida hai dng Khi dTa quay chdm, lin lupt tiip xdc vdi khdi ndng vd khdng lanh di d hai d'ng ridng bidt Khi tiip xdc vdi khdi ndng ta'm xdp nhan nhiet sau dd truyen nhiet eho khdng lanh Khrtrai lir^ Hinh Thiet bi thu hoi nhiet ifieu tam auav Khong l-hi V30 2.2 Thiet bj thu hoi nhiet Thiit bj thu hdi nhidt ddi luu, khdi ndng dupe dua qua mdt sd cdc dng song song dudng kinh nhd, dd se dupe gia nhiet di vao mpt vd bao quanh each dng va di qua eae d'ng ndng mdt hode vdi Ian theo hudng vudng gde vdi true (hinh 2) '^^>'ts^^ls:0°^ 2.3 Thiet bj trao ddi nhiet be mat + Thiit bi trao ddi nhiet d'ng vdng ve mat nguyen ly hodn todn gidng vdi thiit bj trao ddi d'ng nhiet Nhiet td chd't Idng ndng dupe truyen tdi chat Idng lanh hdn qua mdt chd't trung gian gpi Id Chat Idng Truyin nhiet Mdt d'ng cua vdng kin dupc lip tai dong ndng, d'ng edn lai dugc lip dat tai ddng lanh Chat Idng dupe luu thdng bing mdt bom tuan hodn Nhdng dng dyng cdng nghidp chinh la thu hdi nhidt td thdng gid, diiu hda khdng va thu hdi nhidt d nhidt dp tha'p m i l dot 16 vd ngoai "^^-^ ^ Khong kh nonq tam dot 16 Hinh Thiet bi thu hoi nhiet •J.:r.j + Thiit bj thu hdi nhidt bdc xg kim loai bao gdm hai d'ng kim loai ddng tdm Ong kim loai ben chda khdi thai ndng edn khdng ehay (cd nhidt dd thip) eung eip cho md ddt eda Id nung dupe di ben ngodi d'ng LUdng khdng ndy se lay bdt nhiet cda khdi thai Idm nhidt dd cda khdi thai giam xud'ng va ddng thdi nhidt dp cda khdng chay tang len trudc di vdo budng ddt Hinh Thiet bi trao doi nhiet kieu ong boc + Khi vdt chda nhiet thai la chat Idng hay hOi dung d i dd't ndng chd't Idng khac thi can sd dyng bp trao ddi nhidt kiem vd bpc chum dng (hinh 3) vi ea hai dudng dan d i u phai ddng kin d i giu dp suit cua chat Idng tuong Ung Vd bpc co chda bd d'ng va thudng Id cac van budm bdn d i dan hudng dong chd't long vd bpc tren cac d'ng theo nhiiu dudng Nhung Cmg dung ehinh cua thiet bj trao ddi nhidt kiiu vd bpc ehum dng gdm ed chat idng nhidt vdi nhidt cd hoi ngung td he thd'ng lam lanh vd dieu hda khdng khi; nude ngung td hoi quy trinh; chit lam mat td eda Id Hinh 4, Thiet bi trao doi nhiet dang tam 90 S,, , V TAP CHf KHOA HOC CONG NGHE XAY DUNG U Vglw Sd3/2008 luydn, ghi Id vd gia dd dng; chat Idm mat td ddng co, thiit bj nen khi, gia dd vd ehit bdi tron vd nudc ngung tU quy trinh chung cat '-^4^^ 2.4 Thiet bj trao do'i nhiet dang tam Thiit bj trao ddi nhidt dang tim, gdm cd mdt day ede td'm song song tao mpt dudng chay nhd (hinh 4) Cdc tam each bing cdc miing dem va ddng ndng di theo hudng song song qua cac td'm dao chieu dd chd't Idng c i n gia nhiet di theo dudng song song gida cdc tam ndng 2.5 Dudng dng nhiet *-,• Hinh Sd dd tinb toSn thiit bi trao dii nhidt Oudng d'ng nhiet cd the truyen nhiet ndng gip 100 lan so vdi ddng, vdn dupc coi la chit d i n nhidt tdt nhd't Ndi each khae, dudng dng nhidt Id mpt he thdng truyen vd nhdn nhiet ndng liin khdi ndn chi ydu cau bao dudng d mdc thip nhd't Odi vdi eae thiit bj trao ddi nhiet ndi tren, thiit bj trao ddi nhidt b i mdt dupc dp dyng tinh todn thiit k i vdi mue dieh eip nude ndng ed uu diim: de c h i tao, lip dat, thay the qua trinh sddung, T I N H TOAN THIET Bj THU HOI NHIET KHOI THAI CLIA LO NUNG TUYNEL oi DUN NUdc NONG Trong ddi sd'ng sinh hoat hay cdng nghiep, ludn gap ydu eiu can ddt ndng hay lam ngudi mdt chd't Idng, chd't hoac ehit rin ndo dd, thiit bi nham thyc hidn ydu ciu gpi Id thiit bj trao ddi nhidt Chit Idng hay chit tham gia qud trinh trao ddi nhidt dugc gpi Id ehit mang nhidt hay mdi chit Sd lupng mdi chit tham gia vdo qua trinh trao ddi nhidt thdng thudng Id hai mdi chd't Trong san xuit bang Id say - nung lien hoan da thyc hidn tan dung nhidt khdi thai sd'y gach, nhung ehua sin xud't nude ndng phue vy sinh hoat Thiit bj trao ddi nhiet td't v i mat thiit k i cung nhu van hdnh can dap dng dupe cac ydu ciu: - He sd truyin nhiet Idn; Trd khdng thuy lyc dd'i vdi ddng mdi chit ndng vd lanh nhd; - B i mdt trao ddi nhidt cda thiit bi it bj bam ban, de ddng van hdnh vd bao dudng; Thiit bj an todn van hanh, tudi thp cao, kit ed'u don gian, de lap ddt 3.1 Cdc phuong trinh cd ban dupc su dung tinh toan + Phuong trinh edn bing nhidt dQ = k ( t , - t ) d F =kAtdF [w] (1) Trong dd: G,,G2 [kg/s] - Luu lupng khdi lupng eda chit Idng ndng va chit Idng lanh; Cp,, Cp2 [J/kg.°C]- Nhiet dung rieng ddng dp eda chat long ndng vd lanh; t,, t, [°C] - Nhidt dp dau vdo vd cua chat Idng ndng; TAP CHf KHOA HOC C O N G N G H $ XAY DUNG sd3/2008 91 CAC THIET Bj THU HOI NHIET 2.1 Thiet bj thu hdl nhiet kieu ta'm quay Thiit bj ndy Id mdt dia xd'p Idn dUde Idm bang chat lieu cd ndng suit nhidt kha cao vd quay gida hai d'ng ddt sat (hinhl): mdt d'ng khdng lanh vd mdt dng khoi ndng Tryc eda dTa dupe dat trdn phan ngdn chia gida hai dng Khi dTa quay chdm, lan lupt tiip xuc vdi khdi ndng vd khdng lanh di d hai d'ng ridng biet Khi tiep xdc vdi khdi ndng t i m xd'p nhdn nhiet sau dd truyen nhidt cho khdng lanh Khftnsi IN hi ngoai \ao Hinh Thiet bi thu hoi nhiet l