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Chng 5_X l kh thig _ bng phng php hp

hph

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ng dngng dng

Thu hi cht c gi tr Thu hi cht c nng thp, kh chy

Chi ph vn hnh cao (ti sinh) Vn tro bi

So snh (u/nhc im) ca phng php hp thu v hpph ?

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Vt liu hp ph Than hot tnh Silicagel Silicagel Keo nhm (Oxit nhm hot tnh) Zeolite (aluminosilicate minerals) Zeolite (aluminosilicate minerals)

Molecular sieve (crytalline)

Vt liu hp ph Than hot tnh: K nc, km bn c hc, d chy Silicagel (SiO nH O): i lc mnh vi nc; hp ph cht phn Silicagel (SiO2.nH2O): i lc mnh vi nc; hp ph cht phn

cc; hi, kh d ngng t, khng chy, bn c hc, nhit tisinh thp

Keo nhm: (Al2O3.nH2O): bn m, thu hi cc hp cht hu cphn cc v sy khphn cc v sy kh

Zeolite (Me2/nO.Al2O3.xSiO2.7H2O) hp ph hi hp cht phncc, hi nc, gi hot tnh cao 150-2500C, xp nh , , g , p

Nh hp ph Tng nhit (hi nc, kh tr nng, khng kh)

Hi nc (raise the temperature provide the heat ofHi nc (raise the temperature, provide the heat of desorption, act as a carrier gas).Cn thm thi gian lm kh v lm nguig g

Gim p sut (chn khng) Dng cht hp ph thay th

Nh hp ph

Thit b hp ph

Thit b hp phNon-regeration: Air purification (thin bed)- Bng ng gp npBng, ng, gp npDy 0.2-0.6mTc kh: 0.12m/sTc kh: 0.12m/s- Lp dy: kh thi PTN, kho cha ha cht

Thit b hp ph Regenerable Adsorption Systems: lp c nh, gi lng

(fluidized bed) lp vt liu chuyn ng (moving bed)(fluidized bed), lp vt liu chuyn ng (moving bed) Fixed-bed: vertical flow & horizontal adsorber (larger gas

vol)vol) Vn tc kh 6-25m/s. Tn thp p sut 3 -15 in H2O Chiu cao vt liu 0.3-1.8m

Thit b hp ph

Thit b hp ph Moving bed: Three sections : anThree sections : an

adsorption section, a regeneration section, and a dryingcooling sectiondrying cooling section

Thit b hp phThit b hp ph

Gi lng

Hp phu SO2 Hp ph vt l bng than hot tnh:

Hon nguyn: bng nhit (400-4500C), kh tr, hi nng Kh thot ra t hon nguyn c nng 40-50% Phn ng ph:2SO + 3C + 2H O = 2H S + 3CO2SO2 + 3C + 2H2O = 2H2S + 3CO2SO2 + C = S + CO22S + C + 2H2O = 2H2S + CO2

Hp ph ti nc: thu H2SO4 20-25%

Hp ph ha hc: MnOxMnOx nH O + SO + (1 x/2)O > MnSO + nH OMnOx.nH2O + SO2 + (1-x/2)O2 -> MnSO4 + nH2O

MnSO4 + 2NH3 + (n+1)H2O + (x-1)/2O2 -> MnOx.nH2O + (NH4)2SO4MnSO4 + 2NaOH -> MnO + Na2SO4 + H2OMnSO4 2NaOH MnO Na2SO4 H2O

Na2SO4 (in phn) -> H2SO4 + NaOH15

Hp phu SO2 Hp ph ha hc: vi, olomit (CaCO3.MgCO3), 600-12000CCaO + SO2 + O2 = 2CaSO42 2 4CaCO3.MgCO3 + 2SO2 + O2 = 2[CaSO4 + MgO] + 4CO2

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Hp phu H2S & cc hc cha S Hp vt l: Than hot tnh, zeolite Hp ha hc: oxit km st ng Hp ha hc: oxit km, st, ng, Than hot tnh:

H2S b oxy ha: H2S + 0.5O2 -> S + H2O H2S b oxy ha: H2S 0.5O2 S H2O Ti sinh bng dd amon sulfur (NH4)S => (NH4)2Sn Sau nhit phn tch S bng hi nc qu nhit 125-1300C

Zeolit, oxit sat Fe2O3, hydroxyt st, ZnO, Cu (khng phchi)

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Hp ph NOx NO c tnh tr NOx c hp ph mnh bi than hot tnh, tuy nhin d b p p , y

chy n v hnh thnh NO khi hon nguyn Silicagel: khng kinh t Keo nhm: kh nng hp ph km Hp ph NOx bng than bn c tnh kim, tng hiu qu bng

i > hi h t th h th b tamoniac => chi ph u t thp nhng than bn c nguy c tbc chy

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H h th hi d i & kh iHp ph thu hi dung mi & kh mi

Thu hi dung mi: than hot tnh, silicagel, zeolit, keo nhm, sicarbon hot tnh.

Kh mi Thng l t hp

cht c khi lng phn t ln

Nng thp < 1ppm Nng thp < 1ppm Than hot tnh

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Hp ph CO2Hp ph CO2

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Advanced flue gas treatment g

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Chng 6_X l kh thig _ bng phng php xc hitc-nhit

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Phng php x l nhitPhng php x l nhit

t bng ngn la trc tip: khng cn cp nhin liu bsungsung

Bung t: thnh phn nhin liu thpt t hit th h kh l t xc tc, nhit thp hn, khng ngn la

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ng dngng dng

Xc tc:nng thp Thiu t: Cht nhim mi, cht hu c (l rang caf, tht

hun khi, l nung men s .)

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X l NOx, CO Xc tc: nhm Platin (Pd, Ru, Ro .), Ni, Cu, Zn, V . Cht mang: s, oxit nhm, silica gel Cht kh: methane, propane, butane .,CO, H2. Nhit cao: 450-480 (CH4), 350, 150-200NO CH4 N2 CO2 H2ONO+ CH4 -> N2 + CO2 + H2ONO + CO -> N2 + CO2NO + H2 -> N2 + H2ONO + H2 > N2 + H2ONhit thp,xt nhm-vanadi (cht mang oxit Ti)NOx + NH3 ->N2 + H2O

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