Investigation of gasification kinetics with lignite char and steam in a pressureless drop tube reactor

Transcription

1 Deatmet of Eegy Pocess Egieeig ad hemical Egieeig Ivestigatio of gasificatio kietics with ligite cha ad steam i a essueless do tube eacto S. Rußig, M. Schuz, S. Kzack (IE Feibeg) IF1 TU Begakademie Feibeg I Deatmet of Eegy Pocess Egieeig ad hemical Egieeig Reiche Zeche I 9596 Feibeg I Tel. +49()3731/ I Fa +49()3731/ evt@iec.tu-feibeg.de I Web

2 Outlie 1. Motivatio. Feedstock 3. Reacto, schedule ad ocess aametes 4. Detemiatio of ecessay aametes 5. Reactio ates vs. cabo covesio 6. Detemiatio of kietic aametes 7. Results kietic aametes 8. Kietic modelig 9. Summay 1.Outlook

3 1. Motivatio - Kietic modellig of steam gasificatio of ligite cha deedig o cabo covesio X - Use of cha: low volatile cotet - DTR: heat ad mass tasfe close to eal gasifie - Quasi etaied flow 3

4 . Feedstock Feedstock - ha fom heisch ligite, yolysis temeatue 95 - PSD: 63 µm < < µm - Iitial oosity:,5 cm 3 /g, iitial suface Aea: 3 m /g (BET) Tab. 1: Poimate Aalysis, af Tab. : Ultimate Aalysis, wf W Ash Volatiles fi wt-% wt-% wt-% wt-%,99 8,4 3,93 86,68 H N S O F wt-% wt-% wt-% wt-% wt-% m m 89,83,35,33 1,4,

5 3. Reacto ad schedule ad ocess aametes Do tube eacto - eamic (Al O 3 ) tube with 175 cm heated zoe - T u to 14, atmosheic essue oly - Lamia flow, steady state afte ao. 15 mi. Schedule - Multile thoughuts of same feedstock to achieve high X i do tube eacto - Vaiatio of temeatue: Vaiatio of steam atial essue:,3-,6 ba - Post-yolysis tials Pocess Paametes Heatig time: 6-1 ms aticle esidece time: -3 s ha feedig ate:,5-1,5 g/mi gas esidece time: 3,5-5,5 s Volumeflow: 3 l/mi (STP) 5

6 6 4. Detemiatio of ecessay aametes - Heatig time (1) - Gas esidece time - Paticle esidece time - abo covesio - Reactio ate 1 1 si 1, D e T t u w f f s c g v v 3 ) ( 8 s g g V A, m m X g m m s g v v g m m, (1): Hugebühle, Nobet, Eifühug i atielle Diffeetialgleichuge, vdf Hochschulvlg; Auflage: 1 (1997)

7 5. Reactio ates vs. cabo covesio eactio ate i g/(g*s),14,1,1,8,6,4, cabo covesio X i wt.-% het. WGS: hom. WGS: : shows ifluece of stuctual chage o eactio ate : bette fo mathematical aalysis eactio ate " i g/(g*s) eactio ate " i g/(g*s),5,4 ba H O,4 ba H O H O O O H O H O H,,15,1,5, cabo covesio X i wt.-% ,7,6,5,4,3, cabo covesio X i wt.-%,3 ba,4 ba,5 ba,6 ba HO 7

8 6. Detemiatio of kietic aametes k l c k l lk y m k k e E A RT k E 1 l A k R T l y m l l k l k l k -E A /R l c/l 1/T 8

9 6. Detemiatio of kietic aametes eactio ate " i g/(g*s),7,6,5,4,3 l "(X) -,8 -,9-3 -3,1-3, (X =3 wt.-%), cabo covesio X i wt.-%,3 ba,4 ba,5 ba,6 ba HO -3,3 - -1,5-1 -,5 l HO,m -Eoetial iteolatio of eactio ates -alculatio of deedig o X -Liea egessio -Detemiatio of eactio ode ad eactio ate costat fo secific X 9

10 7. Results kietic aametes eactio ode,6,5,4,3,,1 -Reactio ode <1, idicatig limited access of gasifyig aget to iteal suface aea, cabo covesio i wt.-% l k i s -1-1, Xc=5 wt.-% -1,5 Xc=4 wt.-% Xc=3 wt.-% -, 11 Xc= wt.-% -,5 Xc=1 wt.-% 1-3, -3,5 95-4, 9,7,7,74,76,78,8,8,84 1/T i K -1 *1 - Kietical cotol of eactio T<1 - T>1 ossible ifluece of diffusio 1

11 7. Results kietic aametes activatio eegy E A i kj/mol e-eoetial facto i s ,E+9 1,E+8 1,E+7 1,E+6 1,E+5 1,E cabo covesio X i wt.-% cabo covesio X i wt.-% -Oveal icease of E A with iceasig X -valid fo T<1 oe volume i cm 3 /g,8,6,4,, 4 6 cabo covesio X i wt.-% macooes mesooes micooes -Simila ted fo e-eoetial facto 11

12 8. Kietic modelig cabo covesio X i wt.- % time i s data 9 data 95 data 1 data 11 RPM 9 RPM 95 RPM 1 RPM 11 UM 9 UM 95 UM 1 UM 11 - RPM: Ψ=,5 - Oly valid fo gasificatio of gema ligite cha with steam i DTR - Alicable fo X <5 wt.-% RPM: Radom Poe Model UM: Uifom ovesio Model du dt du dt E RT E RT A k e H O, 1 1 U 1 l U A k e H O, 1 U 1

13 9. Summay - Highe cabo covesio achieved though multile thoughuts of cha - Icease of activatio eegy ad e-eoetial facto with iceasig cabo covesio successfully ivestigated - Gasificatio of ligite cha successfully descibed with UM ad RPM covesio models 13

14 1. Outlook - Detemiatio of suface aea (BET) ad Hg-oosimety ogoig - Lagmui-Hishelwood-tye kietic model i combiatio with eactivity data fom fied bed eeimets - Log tem goal: edictio of eactio ates i lage-scale gasificatio 14

15 Thak you fo you attetio! Do you have ay questios? Please ask! 15