NGHIEN CUfU-TRAO D O I
T 6 | U'U H O A LU'U LU'gNG DONG KHI TRONG B U 6 N G LOG DE NANG CAO HlfU SUAT
C O A T H I ^ T Bj LOC BUI TINH DlEN
GAZ QUANTITY OPTIMIZATION IN A FILTRATION CHAMBER TO ENHANCE DUST FILTER EFFICIENCY OF A ELECTROSTATIC PRECIPITATOR
Tri€u Quy HuyS Hoang Van Gpt^
^Trudng Dai hpc Yiet Bdc
^Vien Nghien ciiu Co khi, Bp Cong Thuong
TOM TAT
Hien nay, a Viet Nam co hdng tram thiit bi Ipc bui tinh diin (LBTD) co nguon goc ngoai nhap dang sif dung tai cdc nhd mdy nhiet diin vd cdc nhd mdy sdn xudt xi mang [1], [2],...Viec nghien euu de dua ra gidi phdp nhdm ndng cao hieu sudt cho LBTD co y nghia khoa hpc vd thuc tien quan trpng & Viet Nam Men nay. Nhom nghien euu da de xudt phuong phdp toi uu hoa luang khi cho cdc viing trong buong Ipc, ket qud nghien cim ma ra khd ndng img dung tai Viet Nam, trong cong tdc van hdnh de dat hieu sudt cao cho thiit bi LBTD.
Tir khoa; Lpc bui tinh dien, truong van toe khi. hieu sudt Ipc btii.
ABSTRACT
Now in Vietnam there are hundreds electrostatic precipitators (ESP) imported origin, using in thermal power plants, sement plants,....The study to proposal technology methods to enhance dust filter efficiency,that is importance science and practical significance in Vietnam now. The research team proposed gaz quantity optimization method in zons of the ESP filtration chamber.
The research result is possibility application in the Vietnam for ESP. s operation to obtain high efficiency.
Keywords: Electrostatic precipitator, velocity field, dust filter efficiency. ^
ISSN 0866 - 7056
TAP CHf CO KHf VIET NAM, So 7 nam 2015 www.cokhivietnam.vn
NGHIEN ClJfU-TRAODOi
1. D ^ T VAN DE
BB dat hieu sudt cao cho LBTD, thi lupng khi cdn phdi phan bo d6u d zon ma cdc phdn tii bui cd khd nang ion boa cao, con lupng khi phdi gidm d cac vung cac phan tir bui it co kha nang dupe ion hoa. Neu tim dupe gidi phap d6 tdi uu hoa lupng khi qua cac zon ciia hudng lpc thi cd th^ nang cao duac hieu suat cho LBTD [3], [4].
2. NOI DUNG NGHIEN ClTU 2.1. Khai ni^m ve cac zon trong buong lpc
Theo khd nang dupe ion hoa cua cac phdn tu bui trong trudng dien ap cao thi buong lpc dupe phdn chia ra thdnh ba zon nhu sau [3]:
Zon boat tinh (zon 1) Id zon md phdn tu bui dupe ion hda cao. Id khdng gian nam giira cdc ban cue lang, zon bdn boat tinh( zon 2) nam ke can phia ngoai zdn 1, d do cdc phdn tir bui dupe ion hda yeu va khdng gian ngoai ciing cua bdn cue va cdc phan tir b\ii rat it, cd khd nang ion hda la zdn khong boat tinh (zon 3).
2.2. Anh hudrng ciia svr phdn ph6i khi trong z3n ho^t tinh tdi hi§u suat lpc
Hi6u sudt phu thupc vao van toe khi, dupe xac dinh theo phuofng tdnh sau [3]:
dich tren can xac dinh so bp dupe hdm lupng buiw 11 ddu vdo cua cac mat cat, theo [3], gia tri ciia ham lupmg bui dau vao cua chiing la nhu nhau va tai cac mat cat tiep theo tmh la 1 don vi. Chiing ta xem xet thi n ^ i e m sau: Ket qua do van tdc tsii 4 mat cat: 1,2,3,4, tai cua ddu vao ciia zdn ho^t tinh, the hien tren bang 1.
Bdng L Kit qud thi nghiim
= 1 - 1 - rit] (1)
Trong do: T|J - Hieu sudt lpc tai mat cdt " 1 " , tai cua vdo zon boat tinh ciia LBTD; x\^ - Hieu sudt trung bmh cua LBTD; V ; V, - Van tdc trung binh cua khi trong LBTD va van tdc khi tai mat cat " 1 " tai ciia khi vao.
Tu cdng thiic (1) cho thdy, nku xac dinh duac r|^ cua cdc zon tai ciia vdo thi cd th6 xac dinh duac r\fs cho cd LBTD. D6 dat dupe muc
Ten mat cat
Gia tri V(m/s)
Mat cat 1 1,3
M^t cat 2 0,7
Mat cat i 1,2
M | t cit 4 0,8
Ket qud tinh toan hieu sudt cho 4 mat cat theo cdng thiic (1);
T i - l - ( l - 0 , 9 9 ) ' " - ^ - 0 , 9 7 1 1 ; n , = l-(l-0,99)"o-'-0,9986;
H j - l - ( 1 - 0 9 9 ) , ' " • ^ = 0 , 9 7 8 5 ; Tl^- l-(l-0,99)'«''«-0,9968.
Ham luang bui ddu ra ciia zdn boat tinh dupe xdc dinh theo cdng thiic:
Z.-Z.(1-T1,) (2)
Trong do: Z^, Z^ - Hdm lupng bui ddu ra va dau vdo. Thay ket qud thi nghiem vdo cdng thiic (2), ta nhan duac cac gid tri cua ham luang bui dau ra tuang iing nhu sau: 0,289, 0,014, 0, 215, 0,032 vd gia tri trung bmh cua ham lupng bui ddu ra Z^ la: 0,138g/ N m l N6u nhu ta co su phan bd ddng deu lupng khi trong buong lpc trong zdn hoat tinh, n =0,99 va V =lm/s thi ham luong bui ddu ra tuang iing Id 0,lg/Nm*.
Nhu vay, trong trudrng hpp tren, bdng su phan bd ddng deu lupfng khi ta thu dupe ham lupng bui ra cd the gidm di l,38g/Nm^.
Cdng thiic tinh hieu suat chung r| cua LBTD [3], ta cd Q,, Q^, Q3 - Lupng khi tuong ling ciia cdc zdn 1,2, 3 vd Qo la lupng khi tdng ciia thiet hi, tacd:
ISSN 0866 - 7056
TAP CHf CO KHf VIET NAM, So 7 nam 2015 www.cokhivietnam.vn
NGHIEN CIJU - TRAO Ddi
100%
Hi$u sujt chung:
1,=-
thi:
Z.=Z.(1
a
a
(3)
(4)
(5)
(6)
3. THVC NGHIEM SV ANH HlTdNG CUA LlTglNG KHi DI QUA CAC Z 6 N TRONG BUONG LOC CUA LBTD TOI HIEU SUAT LQC CUA THIET BI
Thi nghiem duoc thuc hien tren mo hinh cua loc bui tmh dien, trong do diing phuong phap dieu chinh bo phan dong Ithi dau vao va dau ra cua bufing lpc de dieu chinh luong khi vao cac zon 1, 2, 3. Thi8t bi do luong khi: Dung thiet bi AHEMOMETP dat tai cac vi tri tuong ung de do luong khi qua cac zon 1, 2, 3.
Theo kinh nghiem cua nude ngoai thi hieu suat Igc cua LBTD cua cac zon trong buon lpc nhu sau [3]: n,=0,999; 71^=0,80; ri3=0,4. Tren CO so ket qua thi nghiem phan dong, lupng Idii di qua cac z6n 1,2,3 vcfi 5 gia tri the hien tren bang 3, svr dung cong thuc (4) va (6) de tinh toan. Ket qua thu dupe trong bang 3.
Bdng 3. Kit qud thi nghiem vd tinh todn hieu sudt loc ciia thiet bi Ithi thay dot lu0ig khi qua cdc zon
NSi dung Lucmg khi q u a z 6 n l , Q , , % Luong khi qua zon 2, Q,,%
Luong khi qua zon 3, Q,,%
Hieu suit IQC cua thiet bit), %
Ty le ham lupng bui sau loc cua TBTD so voi ham luong dau vao
Ket qua thi nghiem va tinh toan 99
0,5 0,5 0,995 0.005
98 1,0 1,0 0,991 0.009
97 1.5 1.5 0,987 0,013
94 3.0 3.0 0,975 0,025
90 5,0 5,0 0,959 0,041
4, DANH GIA KET QUA N G H I £ N CUtI Tu kSt qud thi nghiem trong bdng 3 cho phep ket luan nhu sau:
- Giam luong khi di qua zdnl, 2 xuong 2 Ian thi hdm lucmg bui sau lpc thdi ra moi trudng giam tuong ducmg 2 Idn. Dieu ndy, cd nghia hieu suat lpc bui tang dang ke.
- Ket qud nghien ciiu cho phep ung dung vdo thuc tien san xudt, dp dung dieu chinh luong khi thich hop vao cac zon 1,2, 3 cho eac thilt bi lpc bui bang dien, nhdm ndng cao hieu sudt lpc, gdp phan quan trpng vao bdo ve moi trudng khi tiidi tu cdc nha mdy nhiet dien, san xudt xi mang [2],... •
Ngdy nhan bai: 08/6/2015 Ngay phdn bien: 18/7/2015 Tai li^u tham khao:
[1]. GS.TSKH Nguyin Sy Mao; i o AOT, tap 1, NXB. Khoa hoc va Ky thu?it (2006).
[2]. GS,TSKH. Nguyen Sy Mao; Mot trucmg vd ky thuat xir ly chdt phat thdi. NXB: Khoa hgc va Ky thuat (2008).
[3]. GS,TS. T r k Ngoc Chin; Co hoc vi bui vd phuang phap xu ly bui. t$p 2, NXB. Khoa hpc va Ky thu^t (2001) [4]. HcKajioB JI.B. it-p TEXH, HayK. ,3K0TexHHKa: 3aiiiHTa aiMoctJjepHoro B03flyxa OT BtiSpocoB nbuiH, aapoaoneii H lyManoB, HpocjiaBJib "Pyct" 2004,
[5]. HflCJib H.E. fl-p TCXH. HayK npoi}), Aapormipo-flHHaMHKa TexHOJiorHHecKHX anaparoB, MOCKBA "MaurHHOcrpoeinie"
(1983)
ISSN 0866 - 7056
TAP CHi CO KHl VlfiT NAM, Sd 7 nam 2015 www.cokhivietnam.vn
