Một số đặc điểm tính toán, thiết kế bánh công tác bơm ly tâm vận chuyển chất thải rắn trong các nhà máy nhiệt điện

NGHIEN CO'U-TRAODdi MOT S6 DAC DliWI T I N H T O A N , THiiT K i BANH CONG TAC BOM LY TAM VAN CHUYfiN CHAT THAI RAN TRONG CAC NHA MAY NHIET DIEN SOME CHARACTERISTICS OF CACULATION, DESIGN THE IMPELLER OF SOLID WASTE CENTRIFUGAL PUMPS IN THERMAL POWER PLANTS w, * ThS Bui Minh Hoang', GS,TS Nguyin ThS Mjch', PGS.TS Vii Nam Ngan' 'Trudng Dai hpc Md - Dia chat ^Trudng B ^ hpc Bioh Khoa Hi Npi TOM TAT Ly thuyet tinh todn, thiet ke mdy bom chiu mdi mdn cao phy£ vu thdi tro xi cho cdc nha md nhiet dien vd khai thdc mo, van chuyin bun cdt Gdn lien v&i quy lu^t ddng chay cua cdc dong c long hdipha phdn ddn dong mdy bam Dong thai, xdc dinh dua tren cdc quy luat chung cii ca hoc cdc hon hap ran - long Trang thuc te, de thiet ke che tgo thdnh cong mot may bcmi chiu m mon cao phuc vu thdi tro xi ciing nhu van chuyen imn cat, phdi ket hap chgt chegiica ly thuyet ti toan thiet ke vd tien hdnh thu nghiem bam vai nhieu yeu to dnh huong khdc Bgc biet doi va phdn ddn dong cua bam vd vdn de vdt lieu che tgo mdy bam Bam ly tdm van chuyen chdt thdi rdn cdc nhd mdy nhiet dien can phdi co dien tich lu thong rgng de co thi cho qua cdc hgt rdn Idch thuac lan Bai vgy, kit cau cua bam co nhiiu diem khdc biet so vol ket cdu cua bam nuac thong thuang Tft khoa: Bam dong hon hgp hai pha rdn - long, bam thdi xi, bom mo hinh ABSTRACT Theory of calculation, design the high wear-resistant pumps serving transport ash in thermal power plants, mining With the law of the flow of two-phasefluidflowing in the pumps Also to be determined based on the general rule of mixtures of solid and liquid In fact, to desig and manufacture a high wear-resistant pumps, we must closely combine the theoretical design calculations and conducted experiments the pumps with many different factor Especially for the diversion of pump and materials Centrifugal pumps transport solid waste in thermal power plants requiring large circulatio area to be able to pass large-sized solid particles Therefore the structure of the pump has many ' —&'- "tit." Jifiiu puriicit -ences compared to the normal water pump differences compared to the normal water pump Keywords: Two-phaseflowpump, mixed solid - liquid pump, pump model TAP CHf CO KHf VItT NAM, Sd 1+2 nam 2017 www.cokhivietnam.vn NGHIEN CU'U-TR/\0;:;Oi G i m THIEU trudc vao Id canh C^j va goc dat canh df cua vao pj Ddi vdi bom ddng hdn hgp hai pha ran - Idng, gdc dat canh d cira vao thuotig cd gia tri pj-28M0'' Gdc va Ap cd gia tri khoang rdng hem so vdi bom nuac thdng thuong Ap=3''-20° [3] Banh c6ng tac la bp phSn quan trpng, ca ban nhat cua may borm noi chung va may bom thai tro xi noirieng,no lam nhiem vii biSn doi CO nang trSn true quay th^nh nang lircmg ciia dong chat luu, ket cau banh cong tdc dong vai tro chu dao ket can may bom Bai vay, banh cong tac quyet dinh kit cdu cua may bom Voi may bom ddng hSn hpp hai pha r&i - long noi rieng, cac thSng s6 vi kSt ciu ciia banh cong tac da co nhieu nghien ciiu xem xet anh huong ciia chiing dSn tinh nang, hieu qua lam viec va dS mai mon ciia bam Gdc dat cdnh d cura p^ ciia bom cd gid tri khoang ^=\T^35° [3] Dd dam bao gia tri cua gdc P^ can tinh dudng kinh D^ cua cdnh banh cong tac theo gdc p^ theo quan he sau: ^IS ^sH, CO sd TINH TOAN, THIET KE BOM DONG HON HOP HAI PHA RAN - LONG Khi thiet k§ banh cong tdc bom dong hon hpp hai pha rSn - long, duong kinh v^o (D^) ciia bom va duong kinh mep vao (D,) cua canh dupe xdc dinh tuong tu nhu bam nuoc thSng tiiucmg, nhien, chieu rpng mep vao (b,) xac dinh khac vai bom nuac thdng thuang Do chieu rpng mep vao ciia banh c6ng tdc bang chieu rdng mep (b^), hon niia, chiSu rpng mep lai co y nghia quySt dinh Do do, thiet ke thudng xac dinh tnrdc chieu rdng mep canh, sau lay chidu rdng mep vao bang chidu rpng mdp (b, = bJ [2] Chidu rdng mep b^ dugc xac dinh theo cdng thure thuc nghiem: b^=K,^4Qhi (1) Trong d6, he sd K^^ dugc chpn phu thudc vao so canh ciia banh cdng tdc [1]; - Bdnh cong tac canh: K^2 >2,2; - Banh cdng tac cdnh: K^^ = 1^9 ^ 2,2; - Bmh cdng tac cd sd cdnh nhieu hon 4; Sau xdc dinh dugc chidu rdng b^, ta xdc dinh lai van tdc dong vao C^j,0, van tdc Trong do; U^- Vdn tdc vdng (van tdc theo) d ciia cua banh cdng tac; C^- Vdn tdc kinh tuyen d cua cua banh cdng tac; g- Gia tdc roi tu do; H,^- Cdt ap ly thuyet cua bom: H,rH//ii„; i\ - Hieu suat thuy luc cua bom Khi xdc dinh dugc cdc kich thudc la canh d mep vao va can xac dinh lai he sd chen ddng K, va K^ va xdc djnh lai gdc dat cdnh Sd Id canh it se c6 anh hudng dang kd tdi cot ap Bdi vay, can tinh dnh hudng ciia sd cdnh huu han tdi cot dp ciia bam Tinh tdi anh hudng cua sd cdnh hiiu han cdt dp thuc se cd gid tri bdng [1]: H = %Y^V,C^=r,„£U,C^, (3) Trong dd: p - He s6 ke tdi inh hvrdng cua s6 canh hiiu han duoc xac dinh theo cong thilc cua Phlayderc: ISSN 0866 - 7056 TAP CHf (2) CO KHf V I £ T NAM, S6 1+2 nam www.cokhivietnam.vn 2017 JGHIEN CLfU-TRAOB6I iv z (4) \-(R,IR2Y >i; = (0,55 +0,68)+ 0,6sinP2; Z - S6 li oinh cua binh cong tac; R, E^ - Bin kinh d cila vao va cto ciia ;inh cong tic; s - He s6 ki tdi inh hudng cila so cinh lifti han xic djnh theo cong thilc cua Stadola: S= (5) C - Vin tdc xoiy (van toe tuySt ddi chieu theo phuong van tdc vdng) d cila cinh cong tic B I dim bio c6t ip thuc H cila bom vi giii gdc Pj khdng ddi cin phai thay doi dudng kinh d cto Dj cua cinh cdng tic Viec tinh toan duac tito hanh tdi sai sd dudng kinh Dj hai lin tinh k6 sai khac khong qua +5% [1]: AO, = ^ ' ^ ' < + 5% (6) Dj - Dudng kinh cto ciia la canh lin tinh toin trudc; D^' - Dudng kinh cto cto li cinh lan tinh toin ke sau KET QUA TINH T O A N THIET Kfi BOM THAI XI M HINH Dva trSn mot sd luan diSm da neu, tac gia da tmh toin thiSt k6 binh cdng tic cua bom van tii xi nha may nhi6t diSnte6nco sd bom nude sach, vdi cac thdng sd diu vio nhii sau; Cdng suit dong co di?n; N^ = 55 (kW); Sd vdng quay: n = 1450 (v/ph); Hi6u suit dong ca difn d chS d§ djnh miic; n^T 0,89; Cot ip thiet ke cto miy bom: n^= 57 (mH,0); Luu lugmg tinh toin: 0^= 185 (m'/h); Hi6u suit chung sa bg cto bom: \^= 0,65 Ndng dp thi tich cto xi hdn hgp: C^= 30% (thvc t8 C^,a9d 9,196 ll;IIt cut o,m 0,00€ 0,006 D,14S 0,0M e,wo 2,302 3,635 17.762 5S.34J 0,13 01142 I>,1S4 0.1S3 O,«0€ 0.037 ^«32 4,934 0.412 0.4*9 26,667 0.502 13.323 1(^093 69.J11 am D.OM D,00« 0.00« 0.006 0.006 ^034 0,«1 0.029 0.02T e,»25 1,762 1.492 4,234 3,333 2,833 1U3 1.432 0,416 0.422 0.431 0.446 0.476 0,430 9.433 26.743 26,964 27,400 28,242 30,0« 0.30* 0.5U 0,518 0,337 0,579 13,983 12,772 14l654 13^377 11,629 10,463 ifiK U2M 11.047 9,781 79.4?; tt.tsi 9^073 104,«6S lll.SW 0,166 0,171 0,19 I.I2: 0,952 0.6(1 0.460 Oi473 OlSOl 2^886 'ã-|^ ô 0.401 0.402 0.404 0,406 0,4)9 0,193 0,20t 0.224 0,239 0,331 0,319 0,311 0,506 0,503 e.06t 0^031 ^031 e,»i3 a,«8 20,828 18.G62 16^861 25,192 2^163 19.7« ISSN 0866 - 7056 TAP CHI CO KHi VI$T NAM, Sd 1+2 nam 2017 www.cokhivietnam.vn 17.321 32.559 44135 NGHIEN CCrU - TRAO D | Til kit qua tmh toan cho cac mlu canh bdnh cong tac dugc trinh bay tren cac bang 1,2,3 ta xay dvng dupe bien dang va kit cku eia timg loai banh eong tae ttrong ling thS hiSn trSn cac hiuli 1,2, 3,4,5 va Hinh Mgt cat klnh tuyin ciig BCTmdu BX-1 Hinh Mat cat vl tuyin cua BCTmdu BX-1 il i Hinh Mgt cdt kinh tuyin BCT mdu BX-2 Hmh Mat cdt kinh tuyin BCTmdu BX-3 Hinh Mat cdt vjmyin cua BCTmdu BX-2 Hinh Mat cdt vi tuyen ciia BCTmdu BX-3 ISSN 0866-7056 H TAP CHf CO KHf VIET NAM, Sa 1+2 nam 2017 www.cokhivietnam.vn NGHIEN CU'U - TRAO DOi 4.KETLUi^ Ket qiia cac cdng trinh nghien curu vd mdy bom ly tam dung cho ddng hdn hgp ran Long ciia cac nha nghien cuu, cho thdy: + May bom ly tam lam viec mdi tnxdng hon hgp pha ran - Long tuong ddi phuc tap Trong qua trinh lam viec, tfnh nang, hieu qud lam viec, mai mdn cua may bom chiu anh hudng tong hgp bdi tinh chdt hdn hgp v | n chuydn va cac thdng s6 vd hinh 6ang, kdt clu va didu kien van hanh cua may bom + \^dc nghien cuu, thidt kd may bom ly tam dung cho ddng hdn h c ^ pha r§n - Long ve CO bdn van phai dua vao Iy thuydt tinh toan thiet ke may bom nude sach dd dp dung tinh toan thiet ke cho mdy bom ddng hdn hop pha ran - long Trong qua trinh tinh todn thidt kd, nhirng anh hudng va tdc ddng cua ddng hdn hgp ran - Idng va cac tiidng sd vd hinh dang, ket cau toi tmh nang, hieu qua lam viec va khd nang chiu mai mdn cua may bom dugc xem xet de dieu chinh vice thidt kd may bom + "N^ec tinh todn lua chgn cac thdng sd hinh dang, kdt cau va che lam viec cua may bom phii hgp vdi mdi loai hdn hop nhat dinh (dugc dac trung bdng cac flidng s6; Cv,dh,yh ) n h i m hEua chd tdn thit dp sudt, hieu sudt lam vide cua bom, gidm b ^ hao mdn hu hdng cua cdc chi t i i t Tren co sd ly thuyet tinh todn thidt ke may b o m nuorc s^ch kdt hgp vdi cdc dac trung ndi rieng cua bom ddng hdn hgp hai pha ran Idng, tdc gia da dua dugc 03 mSu bdnh cdng tac phuc vu cdng tac khdo sat cac dac tinh sau nay.»> Ngay nhan bai: 22/01/2017 Ngay phan bien: 20/02/2017 Tai li@u tham khao: [1] Le Danh Lien; Bam, quat cdnh ddn, Trudng Dai hoc Bach khoa Ha Noi, n [2] Le Danh Lien, Nguygn Van Bay, D6 Huy Cuong; Mot so dgc diem tinh todn thiet ki bdnh cong tdc vd lyuSng xoan bam ly tdm van chuyin hon hap nude vm ligt rdn kich thu&c lan, Hpi nghi Khoa hpc ''Ca hpc Thuy toan qudc nam 2003" [3] Vu Nam Ngan; May va thiat bj thuy v§n chuyen dong h6n hgp ran - long, Trudng Dai hpc Mo - Dia chdt, 2012 [4] Karelin V la; Su mdi mon bom cdnh dan Moscava, NXB Ch6 tao May (1978) ISSN 0866 - 7056 TAP CHI CO KHI VIETNAM, Sd l + n a m 2017 www.cokhivietnam ... nghien curu vd mdy bom ly tam dung cho ddng hdn hgp ran Long ciia cac nha nghien cuu, cho thdy: + May bom ly tam lam viec mdi tnxdng hon hgp pha ran - Long tuong ddi phuc tap Trong qua trinh lam... dong vao C^j,0, van tdc Trong do; U^- Vdn tdc vdng (van tdc theo) d ciia cua banh cdng tac; C^- Vdn tdc kinh tuyen d cua cua banh cdng tac; g- Gia tdc roi tu do; H,^- Cdt ap ly thuyet cua bom: H,rH//ii„;... ly tam dung cho ddng hdn h c ^ pha r§n - Long ve CO bdn van phai dua vao Iy thuydt tinh toan thiet ke may bom nude sach dd dp dung tinh toan thiet ke cho mdy bom ddng hdn hop pha ran - long Trong