1. STRUCTURED CARTRIDGES WITH REINFORCED FIBER-GLASS CATALYST FOR FUEL COMBUSTION IN THE FLUIDIZED BEDS OF THE INERT HEAT-TRANSFER PARTICLES
Sergey Lopatin1, Olga Chub1, Nikolay Yazykov1, Danil Pisarev1,3, Alexander Simonov1, Vadim Yakovlev1, Andrey Zagoruiko1,2,3
1Boreskov Institute of Catalysis, Novosibirsk, Russia; 2Tomsk Polytechnic University, Tomsk, Russia; 3Novosibirsk State University, Novosibirsk Russia
Processes of fuel combustion in a fluidized bed of dispersed heat transfer particles
The catalysts used in the process of fuel combustion in a fluidized bed of dispersed heat transfer particles
One of the most popular of the catalysts used in the process of fuel combustion in a fluidized bed of dispersed heat transfer particles at the moment are ceramo-metal catalysts (cermets). Cermets can be prepared in the form of plates, rings, a honeycomb structure etc.
Catalytic fuel combustion is a basis for the efficient and environmentally safe heat energy production.
Promising technology in this area is the burning of different fuels in a fixed bed of structured catalyst with fluidized bed of inert heat transfer particles inside this catalyst bed.
Catalysts for such processes should be structured in the form of cartridges with high void volume.
Also a specific requirement is a high resistance to attrition of the catalyst in highly abrasive environments moving particles.
Cermets used in laboratory equipment in the Boreskov Institute of Catalyst
Catalytic thermal power plant (Altai Region Russia)
Russian patent No , 1997.
Russian patent for untility model No , 2013.
S.Tikhov, V. Usoltsev, A. Salanov, S. Tsybulya, Yu. Chesalov, G. Kustova, V. Sadykov, G. Golubkova, O. Lomovskii, Design of composite porous cermets synthesized by hydrothermal treatment of CrAl powder followed by calcination, J. Mater. Sci., 45 (2010)
Glass-fiber catalysts – promising catalyst for fuel combustion
Pt glass fiber catalyst IC12-S111
Fiberglass catalyst (GFC)- a new class of catalytic systems, where the supports used are glass microfibers, structured in the form of threads and fabrics, and the active components are selected from a wide range of metals (Pt, Pd, Ag, Au, Fe, Cr, Co, Mn , Pb, Cu, etc..) and / or their oxides
Purpose
Deep oxidation of CO, hydrocarbons and organic fuels
Support
Heat-resistant (up to 1100C) high-silica glass fabric
Specific surface area
0,7-3,0 m2/g
Mass fraction of Pt
0,05 – 0,1 % mass
Year
Developer
Development
1912
G.W.Johnson (Англия)
Glass as a carrier for catalysts
1920
General Electric (США)
Pt and Ni supported on a mineral and glass fibers
1960
Engelhard Inc. (США)
Catalysts based on precious metals (Pt, Pd, Ru, Rh) supported on a fiberglass with a layer of secondary oxide support
1990
V.V.Barelko (Institute of Chemical Physics, Chernogolovka, Russia)
Pt and Pd on fiberglass
2000
B.S.Balzhinimaev (Boreskov Institute of Catalysis, Russia)
"Subsurface" clusters of Pt and Pd on fiberglass
2010
P.G.Tsyrulnikov, Yu.S.Kotolevich (Institute of Hydrocarbons Processing), S.A.Lopatin, A.N.Zagoruyko (Boreskov Institute of catalysis)
Application of precious metal (Pt, Pd) and the oxide of the active components (V2O5, MnOx et al.) at the surface of glass fibers using a impulse surface thermosynthesis (IST) method
HIGH ACTIVITY:
In the deep oxidation reactions the catalyst IC-12-S111 exceeds in activity conventional platinum catalysts
Test reaction: deep oxidation of ethylbenzene
Conventional catalyst samples for comparison:
Industrial Pt/Al2O3 ​​catalyst AP-56 ( % Pt)
Silica-zirconia fiberglass catalyst IC-12-S102 ( % Pt, earlier development of BIC)
HIGH THERMAL STABILITY:
IC-12-C111 provided long-term (up to 100 hours) operation in fuel combustion processes without loss of activity and mechanical strength at temperatures C
Combustion of propane-butane fuel gas in catalytic burners with IC-12-S111 catalyst
Impulse surface thermosynthesis (IST) - synthesis of the active component of the catalyst (Pt) from a precursor containing the active metal salt and a reducing agent, with rapid rise in temperature.
Catalytic cartridges with GFC for use in the process of fuel combustion in a fluidized bed of dispersed heat transfer particles
Two types of catalytic cartridges with GFC IC-12-S111 for pilot tests
The basis of the design - the catalytic element containing fiberglass catalyst reinforced with stainless steel wire mesh.
Structurisation provides high void volume and large gas passage size, external reinforcement of the catalyst by wire mesh protects it from attrition by heat transfer particles.
Cellular cartridges
Concentric cartridges
Pilot tests results
A large variety of catalytic structures may be manufactured
The experiments showed that the cellular cartridges with a small cross-section of the channel are subject to clogging of channels particles coolant, while the cartridges with concentric structure demonstrated stable operation
Pilot testing procedure
Catalytic tests were conducted in a flow system with the fluidized bed of particles of fuel brown coal (≤ 5 mm), mixed with heat transfer material - quartz sand (particle size 1-2 mm), operation temperature C, ambient pressure.
The discharged cartridges had no traces of catalyst attrition and no sign of catalyst deactivation
Scheme of the pilot stand 1 - valve; 2 - flowmeter; 3 - heater; 4 – fuel vessel; 5 – electric engine; 6 – screw feeder; 7 – electrically heated reactor; 8 – cyclone separator; 9 – ash vessel.
The experiments were conducted
By Dr. Nickolay A.Yazykov
(Boreskov Institute of Catalyst)
The oxidation efficiency of the GFC cartridges is on the same level than one for best cermet samples
The developed cartridges with glass-fiber catalyst reinforced by steel wire mesh appeared to be efficient and were recommended for further tests in the conditions of the commercial heat production unit