The effects of three factors on combustion performance of petroleum coke, Herin Coal and Shenmu Coal have been studied, including the ratio of primary air, excess air factor, and the swirling intensity of outer second...
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The effects of three factors on combustion performance of petroleum coke, Herin Coal and Shenmu Coal have been studied, including the ratio of primary air, excess air factor, and the swirling intensity of outer secondary air. The experiments were carried out on a one-dimensional furnace with dual channel swirling burner, in which temperature of center furnace, emission of air pollutants, and burn-out rate of fuel were measured. The results provide the optimal ratio of primary air, excess air factor and swirling intensity of outer secondary air for the fuels. The combustion performance of petroleum coke B is much better than petroleum coke A, but worse than Hejin coal and Shenmu coal. In addition, the burn-out rate of petroleum coke depends much more on the temperature in terminal stage of combustion than in the early stage of combustion.
α-Fe2O3 nanorod arrays were fabricated by a low-temperature aqueous chemical growth (ACG) technique and followed by an annealing process. For the surface doping of α-Fe2O3 nanorods, β-FeOOH nanorods obtained via AC...
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α-Fe2O3 nanorod arrays were fabricated by a low-temperature aqueous chemical growth (ACG) technique and followed by an annealing process. For the surface doping of α-Fe2O3 nanorods, β-FeOOH nanorods obtained via ACG were coated with a thin layer of Cr3+ precursor solution by spin coating, and then underwent the annealing treatment in air. Conducting polymer polypyrrole (PPy) decorated α-Fe2O3 nanorods were prepared by electrodeposition method using malic acid contained pyrrole aqueous solution. Primary results showed that the photocurrents of α-Fe2O3 nanorod array photoanodes were greatly enhanced by surface doping of Cr3+, as well as PPy decoration. This might be due to the retarded charge recombination and promoted surface reaction rate of photogenerated holes with water. Further investigation on surface modification of α-Fe2O3 nanorod array photoanodes is currently conducted in our group.
The behavior of air bubbles rising in water and the bubble induced flow field are numerically studied using a three‐dimensional two‐way coupling algorithm based on Vortex‐In‐Cell method. A small vortex ring struct...
The behavior of air bubbles rising in water and the bubble induced flow field are numerically studied using a three‐dimensional two‐way coupling algorithm based on Vortex‐In‐Cell method. A small vortex ring structure is generated with the rising of bubbles and the small vortex ring structure is led by the rising bubble cluster at first. The bubbles are accelerated by the vortex ring structure, and the bubble distribution and the shape of the bubble cluster are transformed by the vortex ring structure at the same time.
The performance of 3 types of energy utilization cycles including the organic Rankine cycle, the single stage static hydrogen compression cycle, and the new multistage continuous hydrogen compression cycle were analyz...
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The performance of 3 types of energy utilization cycles including the organic Rankine cycle, the single stage static hydrogen compression cycle, and the new multistage continuous hydrogen compression cycle were analyzed. A multi-element valued model was used to evaluate the performance holistically, and the result showed that the integrated superiority achieved 0.721, which indicated the continuous hydrogen compression cycle is considered the best option among the typical compression energy utilization cycles and deserves thorough studying.
There are two types of laying technologies of two pipelines in one ditch: laying two oil pipelines in one ditch and laying an oil pipeline with a gas pipeline in one ditch. Because of the Joule Thomson effect and the ...
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There are two types of laying technologies of two pipelines in one ditch: laying two oil pipelines in one ditch and laying an oil pipeline with a gas pipeline in one ditch. Because of the Joule Thomson effect and the differences of the pipeline diameter, the thermal impact of these two different types of laying technologies may be different. An unstructured-finite-volume numerical method was used to study the differences of the thermal impact between these two different types of laying technologies.
The isomerization of endo-tetrahydrodicyclopentadiene (THDCPD) to exo-THDCPD over AlCl 3 catalyst has been studied in a batch reactor. The effects of temperature, catalyst loading, and the type and amount of solvent ...
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The isomerization of endo-tetrahydrodicyclopentadiene (THDCPD) to exo-THDCPD over AlCl 3 catalyst has been studied in a batch reactor. The effects of temperature, catalyst loading, and the type and amount of solvent on the isomerization rate were investigated. Under the conditions of removing both internal and external diffusion effects, a kinetic model was established and the model parameters were developed. The results showed that the endo- to exo- isomerization of THDCPD can be treated as a first-order reaction. The activation energy E 0 and pre-exponential factor obtained from Arrhenius plot are 116 kJ I mol and 3.39x10 13 respectively. The simulation results agreed well with the experimental data.
The heat transfer enhancement of Longitudinal Vortex (LV) is a kind of technology with efficiency is high and resistance is low. The effective influence distance of LV is very important to extend this kind of technolo...
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The heat transfer enhancement of Longitudinal Vortex (LV) is a kind of technology with efficiency is high and resistance is low. The effective influence distance of LV is very important to extend this kind of technology in narrow rectangular channels under water medium. CFX10.0 is used to simulate this question, and three velocity components of water flow have been used to define the strength of LV. The results of this calculate method are compared with the experimental results of thermal infrared imager and phase doppler particle analyzer, and they are reasonable. In this paper range, the effective influence distance of LV is bigger than 33 times of Longitudinal Vortex Generators (LVGs) height.
Experimental investigation was conducted on the cooling tower test device using the outlet water temperature as evaluation index. The experimental results indicated that: the outlet water temperature decreased with th...
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Experimental investigation was conducted on the cooling tower test device using the outlet water temperature as evaluation index. The experimental results indicated that: the outlet water temperature decreased with the increase of air-to-water ratio, but the trend was decreasing gradually. The limit air-to-water ratio existed during the decrease of outlet water temperature. The outlet water temperature had little change when the air-to-water ratio was up to this value. The limit air-to-water ratio decreased with the increase of inlet air dry bulb temperature and wet bulb temperature, and increased with the increase of inlet water temperature. And the limit air-to-water ratio decreased with the increase of the flow rate of circulating water. Such conclusions may be advantageously used in guiding the design and operation of cooling tower.
A two-dimensional two-phase non-isothermal mass transport model is developed in this paper for the air breathing direct methanol fuel cell(DMFC). The self-made computer code is used to simulate the heat and mass trans...
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The viscous and pressure gradient terms, which can be solved by Green Function method theoretically, are calculated separately in MPS method. Through the analysis of kernel function, an accuracy condition of viscous t...
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The viscous and pressure gradient terms, which can be solved by Green Function method theoretically, are calculated separately in MPS method. Through the analysis of kernel function, an accuracy condition of viscous term is proposed and the reasonable match between spatial and time step will increase the accuracy and stability of MPS method. Poiseuille flow is simulated and the accuracy condition is validated. In the analysis of the source term of Pressure Poisson equation, the particle number density (PND), which is very sensitive to the relative configuration of particles, yields the deviation of velocity profile from the theoretical solution. It is the fluctuation in PND that causes the spurious fluctuation of pressure.
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