Experiments were carried out to study the concentration distribution of disparately sized binary particle in the jet region of a 1-m dia & 8-m high semicircular jetting fluidized bed with a conical *** particles c...
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Experiments were carried out to study the concentration distribution of disparately sized binary particle in the jet region of a 1-m dia & 8-m high semicircular jetting fluidized bed with a conical *** particles concentration was measured by the optical fiber probe system and *** fine particles were injected coaxially to simulate fines recycled into the jet high temperature region in an actual operating unit with different fine particles feed-in *** was found that the coarse particles concentration increases when the jet gas-velocity reaches to the certain *** distributor gas-velocity increasing results in the increasing of the time-averaged particles volume concentration in the jet *** annular gas-velocity increase causes the particles concentration to *** there is high fine concentration existing in the jet region of large jetting fluidized *** fine particles concentration in the jet region increases with the increasing of fine particles feed-in quantity,and the fine concentration increased toward the bed surface. When reaching to a certain bed height,the fine concentration begins to decrease.
The experiment was conducted to study the pressure profiles and gas-solid flow in the standpipe of a new cold model of circulating fluidized bed reactor combined with a coal pyrolysis *** effects of superficial gas ve...
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The experiment was conducted to study the pressure profiles and gas-solid flow in the standpipe of a new cold model of circulating fluidized bed reactor combined with a coal pyrolysis *** effects of superficial gas velocity in the riser U,circulating rate G and aeration added to the pyrolysis chamber Q on the axial pressure profiles in the standpipe were *** U increasing the negative pressure gradient in standpipe decreased *** G increasing the negative pressure gradient and slip velocity in the standpipe were also *** of aeration added to the pyrolysis chamber on gas/solid flow state in the standpipe was *** U and orifice of the valve at the bottom of the standpipe kept constant,pressure distribution trend especially at the top of the standpipe would become larger with Q *** flow pattern in the standpipe changing from negative pressure difference to positive pressure difference occurred with U increasing when Q and the orifice of the valve at the bottom of the standpipe were *** the modified Ergun equation was suitable for describing the moving bed flow in the standpipe of the system.
Microwave was introduced in as a heat source during the homogeneous precipitation for the precursor of *** ZnO nanoparticles were obtained via calcination of the *** surface of the as-prepared ZnO nanoparticles was ac...
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Microwave was introduced in as a heat source during the homogeneous precipitation for the precursor of *** ZnO nanoparticles were obtained via calcination of the *** surface of the as-prepared ZnO nanoparticles was activated using silane coupling agent and then modified with polymethyl methacrylate by grafting *** electron microscopy and scanning electron microscopy exhibited the morphologies of ZnO *** crystalline structure of the nanoparticles was characterized by X-ray powder *** Transform infrared spectroscopy,lipophilic test,contact angle measurement and differential scanning calorimetry illustrated that ZnO nanoparticles were well *** results show that the microwave-assisted technique is a perfect method for nanoparticles synthesis and surface modification.
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