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Effect of partial pit exhaust ventilation system on ammonia removal ratio and mass transfer coefficients from different emission sources in pig houses

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Energy and Built Environment 2020年第4期1卷 343-350页

作者： Li Rong Department of Engineering Aarhus UniversityInge Lehmanns Gade 108000 Aarhus CDenmark

A partial pit exhaust ventilation(PPEV)system installed below the slatted floor has been widely used in fattening pig barns nowadays in *** tests showed that annually around 50%of ammonia emissions was collected by PPEV ***,the percent of emissions collected by PPEV system from different emission sources including slurry manure surfaces,top surfaces,bottom surfaces and side surfaces of the slatted floor has not been investigated as well as the mass transfer *** study applied CFD modeling to investigate the removal ratio of ammonia emissions from four emission surfaces including the top,side,bottom surfaces of the slatted floor and slurry manure *** CFD model was validated by experimental air speeds measured in a room equipped with two full-scale *** validated CFD model was further adopted to simulate cases under five ventilation rates(2000-4000 m^(3)/h),four emission sources and two locations of PPEV system *** results showed that the removal ratios of ammonia emissions by PPEV system from the four emission sources were generally higher for the cases that the PPEV exhaust was installed opposite to the air supplier than the values of those cases that the PPEV exhaust was located at the same side of side wall air *** removal ratios of ammonia emissions were the highest with the emission source of slurry manure surface and generally 30%higher than the values of other *** mass transfer coefficients with the emission sources on the side surfaces of the slatted floor were the *** results indicated that the airflow patterns and locations of emission sources greatly influenced the removal ratios of ammonia emissions and ammonia mass transfer coefficients.

关键词： Ammonia emission Pig house Partial pit exhaust ventilation CFD removal ratio

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Effect of low basicity refining slag on evolution and removal of oxide inclusions in 55SiCrA spring steel

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Journal of Iron and Steel Research International 2023年第9期30卷 1755-1768页

作者： Chen Wang Wei Tang Jiang-shan Zhang Jun-xiong Huang Kun-rui Shen Jun Chen Qing Liu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Xiangtan Branch Hunan Valin Iron&Steel Co.Ltd.Xiangtan 411100HunanChina

The laboratory experiments,thermodynamic analysis,dynamic analysis,and industrial trials were carried out to investigate the influence of refining slag on the evolution and removal of oxide inclusions in 55SiCrA spring *** reduction in basicity and Al_(2)O_(3) content in refining slag can reduce the[Al]s content in the molten steel,which is conducive to the control of the low melting point of ***,the refining slag with excessively low basicity transfers the oxygen element to molten steel and increases the Al_(2)O_(3) content in inclusions,which is harmful to the control of *** to the chemical compositions of inclusions and refining slag in laboratory experiments,their physical parameters were *** maximum separation ratio and the moving time of inclusions to reach the maximum separation ratio(t_(max))of inclusions under different laboratory experimental conditions were *** maximum separation ratio of inclusions is positively correlated with the overall wettability(coshIMS)among the slag,steel,and *** maximum separation ratio of inclusions obtained by laboratory experiments is between 85%and 91%.The t_(max) decreases with the decline in basicity and Al_(2)O_(3) content of refining slag,but excessively low basicity will increase the t_(max).The basicity of refining slag in the range of 0.88–0.97 and the content of Al_(2)O_(3) less than 6%is not only conducive to reducing the content of Al_(2)O_(3) and the melting point of inclusions but also beneficial to removing the inclusions to the *** slag system shows good metallurgical results in industrial trials.

关键词： Thermodynamic analysis Dynamic analysis Oxide inclusion Evolution mechanism removal ratio Overall wettability

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Phenol Oxidation by Combined Cavitation Water Jet and Hydrogen Peroxide

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Chinese Journal of Chemical Engineering 2012年第4期20卷 760-767页

作者：卢义玉刘勇夏彬伟左伟芹 State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam Chongqing Uni-versity College of Safety Science and Technology Henan Polytechnic University

The paper presents results of phenol oxidized under the conditions of high temperature created during collapse of cavitation *** degradation efficiency has been greatly improved by using cavitation water jets combined with H2O2 as demonstrated in laboratory *** factors affecting phenol removal ratio were ex-amined and the degradation mechanism was revealed by high performance liquid chromatography(HPLC).The re-sults showed that 99.85% of phenol was mineralized when phenol concentration was 100 mg·L-1 with pH value of 3.0,H2O2 concentration of 300 mg·L-1,confining pressure of 0.5 MPa,and pumping pressure of 20 *** in-termediate products after phenol oxidation were composed of catechol,hydroquinone and ***,phenol was degraded into maleic acid and acetic ***,a dynamic model of phenol oxidation via cavi-tation water jets combined with H2O2 has been developed.

关键词： phenol oxidation cavitation water jet hydrogen peroxide wastewater treatment correlation coeffi-cient removal ratio

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Behavior of Non-metallic Inclusions in a Continuous Casting Tundish with Channel Type Induction Heating

Behavior of Non-metallic Inclusions in a Continuous Casting ...

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“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： Wang Qiang Li Baokuan TSUKIHASHI Fumitaka School of Materials and Metallurgy Northeastern University Department of Advanced Materials Science Graduate School of Frontier SciencesThe University of Tokyo

A transient 3D mathematical model has been developed for the motion of inclusions in a continuous casting tundish with channel type induction *** Euler-Lagrange approach was employed,and the inclusion trajectories were obtained by numerical solution of the motion equation including gravity,buoyancy,drag,lift,added mass,Brownian,electromagnetic pressure and thermophoretic ***,the collision and coalescence of inclusions and adhesion to the lining solid surfaces were also taken into *** Brownian,Stokes and turbulent collision were clarified,*** effect of induction heating power on the inclusion behavior was *** results indicate that the electromagnetic pressure force significantly promotes the removal of inclusions,especially for the bigger *** the thermophoretic force goes against the removal of inclusions,its influence is negligibly *** removal ratio of inclusions in the tundish with induction heating increases from 67.45%to 96.43%while the power varies from800k W to 1200k *** collision and coalescence should be included when model the inclusion motion,because it can promote the removal of *** turbulent and Brownian collision becomes more active with the increasing power,while the Stokes collision is just opposite.

关键词： tundish induction heating inclusion motion collision and coalescence removal ratio

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