The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Jan Spisak - One of the best experts on this subject based on the ideXlab platform.
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Burners for Rotary Furnace - Proposal and Comparison
Applied Mechanics and Materials, 2015Co-Authors: Jan Spisak, Dusan Nascak, Branislav Vaňko, Jan GlocekAbstract:In the paper are presented the possibility of using axial and radial diffusion burner in Rotary Furnace. Both types of burners allow secondary air combustion, combustion quality measure is the ratio of primary and secondary flame. Experimental comparison of both types of burners has been performed with the high-revolution Rotary Furnace. On this basis, benefits have been identified and their use possibilities.
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Influence of diffusive combustion on the Rotary Furnace performance
Proceedings of the 2015 16th International Carpathian Control Conference (ICCC), 2015Co-Authors: Jan Spisak, Imrich Kostial, Marti TruchlýAbstract:Diffuse combustion is one of the basic mode of the heat generation. Solution of the diffuse combustion problems very tightly connected with specific conditions of its utilization. Insufficient regarding of the specific conditions can significantly decrease their performance (in comparison by their technical possibility). On the other hand, by proper solutions of diffuse combustion, activity of thermal apparatuses can be significantly improved. Diffuse combustion can be realized by axial or radial burners. Axial diffuse burners are generating required flame length by adaptation of their geometry, mainly by the position and dimensioning of fuel nozzles. By their adequate arrangement combustion efficiency can be significantly improved. Radial diffuse burners consist in transversal fuel flow. By radial mixing, flame length in axial direction can be significantly decreased. Radial flame is arranged in such way that the principal combustion is executed in its primary part. This has important influence on development of combustion process. Pilot and industrial experiments of diffuse burners on the Rotary Furnaces enabled to achieve improved combustion and to increase the heat transfer directed to the heated material. The main contribution is very effective combustion of the secondary air, which results in the increasing influence of the secondary air proportion on the whole combustion process. Developed mathematical model of the Rotary Furnace combustion was used for burner design and flame optimal distribution in the burner side of the Furnace. Presented diffusive burner was experimentally verified on the sintered magnesia production process in the Rotary Furnaces.
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EFFECTIVE USE OF Rotary Furnace SHELL HEAT
Acta Polytechnica, 2014Co-Authors: Julius Lisuch, Dusan Dorcak, Jan SpisakAbstract:Significant proportion of the total energy expenditure for the heat treatment of raw materials are heat losses through the shell of Rotary Furnace. Currently, the waste heat is not used in any way and escapes into the environment. Controlled cooling system for Rotary Furnace shell ( CCSRF ) is a new solution integrated into the technological process aimed at reducing the heat loss of the Furnace shell. Based on simulations and experiments carried out was demonstrated a significant effect of controlled cooling shell to the Rotary Furnace work. The proposed solution is cost-effective and operationally undemanding.
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HIGH-REVOLUTION Rotary Furnace FOR FINE-GRAINED MATERIALS HEAT TREATMENT
European Scientific Journal ESJ, 2013Co-Authors: Jan Spisak, Dusan Nascak, Andrej HacevskyAbstract:Fine-grained and dust materials create a significant part of the thermally treated substances. The capabilities of materials processing are currently limited, thus making difficult its use. Rotary Furnaces are contemporary the most important apparatuses for fine-grained materials processing. Apart from low efficiency, the process has also other limits that hinder their use for the fine-grained fractions heat treatment. The main problem of fine-grained materials processing lies in air tightness or low permeability of processed material layer. The concept of high-revolution Rotary Furnace was based on the mechanical fluidization of the material by which the homogeneous fluidized material layer through cross-section of the Rotary Furnace was obtained. Thereby homogeneous heating of individual grains was obtained. The research of mechanical fluidization was realized on the physical model of high-revolution Rotary Furnace. The pilot Furnace design was based on the results of the experiment. The experiments focused on rheological, hydrodynamic and thermodynamic processes were conducted on this pilot high-revolution Rotary Furnace. The results of the experiments have confirmed correct functionality of the aggregate for the fine-grained materials heat treatment. The principal advantage of the Furnace is the fluidization process which doesn’t depend on the flow and combustion processes
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INNOVATION OF Rotary FurnaceS FOR GRANULAR MATERIALS HEAT TREATMENT
European scientific journal, 2013Co-Authors: Jan Spisak, Vratislav Sindler, Eva OravacovaAbstract:The current Rotary Furnaces have very good application possibilities in materials processing of various granularities. Their main disadvantages are negative economic and ecological indexes. The Rotary Furnaces research was focused on the Furnace operation improvement so as to obtain improved operating parameters. Based on the results of the simulation and operations in pilot conditions, the following six optimization measures were tested: charge preheater, self-regulating charge feeder, radial seal, controlled cooling of Furnace shell, diffusion burner and sinter cooler. As the result of evaluation of individual measures, the fuel savings can be achieved. Applying the measures, the Rotary Furnace indexes will approach to other thermal apparatus while preserving or increasing their most significant index which is high Furnace output.
Yin Wang - One of the best experts on this subject based on the ideXlab platform.
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a process combining hydrothermal pretreatment anaerobic digestion and pyrolysis for sewage sludge dewatering and co production of biogas and biochar pilot scale verification
Bioresource Technology, 2018Co-Authors: Chunxing Li, Xingdong Wang, Guangyi Zhang, Jie Li, Zhiwei Li, Guangwei Yu, Yin WangAbstract:Abstract To fully dispose of/utilize sewage sludge, a process combing hydrothermal pretreatment (HTPT), anaerobic digestion (AD) and pyrolysis was developed and tested at the pilot scale. First, the improvement in sludge dewaterability by HTPT at 180 °C for 30 min was verified, and the water content decreased from 85 to 33 wt% after filter pressing. Then, the resulting filtrate underwent continuous mesophilic (37 ± 2 °C) AD in an up-flow anaerobic sludge bed (UASB) reactor for producing biogas to compensate for the energy required for HTPT. Meanwhile, the filter cake was pyrolyzed in a Rotary Furnace (600 ± 50 °C) to generate biochar, and heavy metals were well immobilized in the biochar. Finally, the material/energy balance made according to the pilot data showed that the proposed process was effective for full resource reuse of sewage sludge.
Saliu Ojo Seidu - One of the best experts on this subject based on the ideXlab platform.
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Production of Refractory Lining for Diesel Fired Rotary Furnace, from Locally Sourced Kaolin and Potter’s Clay
Journal of Minerals and Materials Characterization and Engineering, 2013Co-Authors: Fatai Olufemi Aramide, Saliu Ojo SeiduAbstract:This research was conducted to formulate a refractory lining recipe for lining diesel fired Rotary Furnace from locally sourced kaolin, using locally sourced potter’s clay as binder. Six samples (A-F) of kaolin clay mined locally from Apata II area, Ondo road, in Ile-Ife,Nigeria, were roasted at 1200oC held for 8 hours, mixed with different percentages of raw kaolin and appropriately made into briquettes using potter’s clay of good plasticity as binder. The samples were tested for various refractory properties. The result showed that sample mixes A (100% chamotte), B (80% chamotte, 20% rawkaolin) and C (60% chamotte, 40% raw kaolin) are considered to have good properties. However, the optimum material-mix for the refractory bricks lining, with particular reference to the highest thermal shock resistance was found to be 80% chamotte mixed with 20% raw kaolin.
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production of refractory lining for diesel fired Rotary Furnace from locally sourced kaolin and potter s clay
Journal of Minerals and Materials Characterization and Engineering, 2013Co-Authors: Fatai Olufemi Aramide, Saliu Ojo SeiduAbstract:This research was conducted to formulate a refractory lining recipe for lining diesel fired Rotary Furnace from locally sourced kaolin, using locally sourced potter’s clay as binder. Six samples (A-F) of kaolin clay mined locally from Apata II area, Ondo road, in Ile-Ife,Nigeria, were roasted at 1200oC held for 8 hours, mixed with different percentages of raw kaolin and appropriately made into briquettes using potter’s clay of good plasticity as binder. The samples were tested for various refractory properties. The result showed that sample mixes A (100% chamotte), B (80% chamotte, 20% rawkaolin) and C (60% chamotte, 40% raw kaolin) are considered to have good properties. However, the optimum material-mix for the refractory bricks lining, with particular reference to the highest thermal shock resistance was found to be 80% chamotte mixed with 20% raw kaolin.
Dusan Dorcak - One of the best experts on this subject based on the ideXlab platform.
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EFFECTIVE USE OF Rotary Furnace SHELL HEAT
Acta Polytechnica, 2014Co-Authors: Julius Lisuch, Dusan Dorcak, Jan SpisakAbstract:Significant proportion of the total energy expenditure for the heat treatment of raw materials are heat losses through the shell of Rotary Furnace. Currently, the waste heat is not used in any way and escapes into the environment. Controlled cooling system for Rotary Furnace shell ( CCSRF ) is a new solution integrated into the technological process aimed at reducing the heat loss of the Furnace shell. Based on simulations and experiments carried out was demonstrated a significant effect of controlled cooling shell to the Rotary Furnace work. The proposed solution is cost-effective and operationally undemanding.
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Controlled Cooling of Rotary Furnace Shell
Advanced Materials Research, 2014Co-Authors: Julius Lisuch, Dusan DorcakAbstract:Heat losses through the shell of Rotary Furnace represent a significant share of total energy expenditure for the heat treatment processes of raw materials. Heat loss is currently not used in any way and escapes into the surroundings. Controlled cooling system of Rotary Furnace shell is a new solution integrated into the technological process aimed at reducing heat losses by the shell of Furnace. The proposed solution is economically advantageous and operationally undemanding.
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The Rotary Furnace model based predictive control
Proceedings of the 13th International Carpathian Control Conference (ICCC), 2012Co-Authors: Imrich Kostial, Jan Spisak, Dusan DorcakAbstract:Process control is one of the principal approaches to increase process quality and performance. Model based control system is based on real time mathematical model, which can be used at individual levels of the process hierarchy in the on line real time control system. The model is used for interpretation, planning, and execution of the tasks through the autonomous controllers. For the outlining tasks, a human operator controls a simulation model to generate a sequential list of desired sub-goals. The human operator is specifying controller's set-points and allowing the autonomous control capabilities of the Furnace to coordinate the actual trajectory between set-points. Provision is made to preview the proposed trajectory for approval or modification before execution. Developed model is used for the support of direct and supervisory control. On the basic control level the model is used for process monitoring and process prediction. Supervisory level model is used for process planning, and execution of the task segments through the autonomous controllers. The autonomous control capabilities of the Furnace are used to coordinate the actual trajectory between set-points. The Rotary Furnace predictive control, model was used on the direct and supervisory control level. Basic control level include process monitoring and process prediction.
Julius Lisuch - One of the best experts on this subject based on the ideXlab platform.
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EFFECTIVE USE OF Rotary Furnace SHELL HEAT
Acta Polytechnica, 2014Co-Authors: Julius Lisuch, Dusan Dorcak, Jan SpisakAbstract:Significant proportion of the total energy expenditure for the heat treatment of raw materials are heat losses through the shell of Rotary Furnace. Currently, the waste heat is not used in any way and escapes into the environment. Controlled cooling system for Rotary Furnace shell ( CCSRF ) is a new solution integrated into the technological process aimed at reducing the heat loss of the Furnace shell. Based on simulations and experiments carried out was demonstrated a significant effect of controlled cooling shell to the Rotary Furnace work. The proposed solution is cost-effective and operationally undemanding.
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Controlled Cooling of Rotary Furnace Shell
Advanced Materials Research, 2014Co-Authors: Julius Lisuch, Dusan DorcakAbstract:Heat losses through the shell of Rotary Furnace represent a significant share of total energy expenditure for the heat treatment processes of raw materials. Heat loss is currently not used in any way and escapes into the surroundings. Controlled cooling system of Rotary Furnace shell is a new solution integrated into the technological process aimed at reducing heat losses by the shell of Furnace. The proposed solution is economically advantageous and operationally undemanding.
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Model based control of Rotary Furnaces for magnesia sintering
2011 12th International Carpathian Control Conference (ICCC), 2011Co-Authors: Imrich Kostial, Julius Lisuch, Jan Spisak, Jan Mikula, Anna Babjaková, Peter KošinárAbstract:Rotary Furnace simulation model was used for a model-based control on behalf of the on-line interactive communication. Developed model is used for the support of direct and supervisory control. On the direct control level model is used for process observation and process prediction. On the supervisory level model is used for process planning, and execution of the task segments through the autonomous controllers. For the purposes of outlining tasks, a human operator controls a simulation model to generate a sequential list of desired sub-goals for a Furnace. A graphic user interface displays operational state and process parameters. The human operator is specifying controller's set-points. The autonomous control capabilities of the Furnace are used to coordinate the actual trajectory between set-points. Provision is made to preview the proposed trajectory for approval or modification before the execution.
