scholarly journals Development of energy efficient technology of combined blowing of converter bath by oxygen and neutral gases

2018 ◽  
pp. 182-207
Author(s):  
A.G. Chernyatevich ◽  
L.S. Molchanov ◽  
P.O. Yushkevich ◽  
V.V. Vakulchuk
Keyword(s):  
High Temperature ◽  
Industrial Development ◽  
New Technology ◽  
Design Parameters ◽  
Practical Implementation ◽  
Efficient Technology ◽  
Converter Bath ◽  
Neutral Gas ◽  
Temperature Modeling ◽  
Saving Effect

The aim of the work is the development of a new technology of combined purging of the converter bath with oxygen and neutral gas, which allows to achieve a significant resource and energy saving effect. The proposed technological scheme of combined purging is based on the use of a new design of a three-tiered tuyere and a system for supplying two regulated oxygen flows to it. It is possible to completely replace oxygen with nitrogen at certain periods of melting, which allows us to significantly expand the technological capabilities of the combined purge of the converter bath. The design of a three-tiered tuyere, which eliminates the disadvantages of two-tier blowing devices, was carried out using high-temperature modeling. Processing of the materials obtained in the course of the conducted melts allowed us to obtain new information about the features of the physicochemical processes developing during the flushing of the converter bath with the afterburning of the exhaust gases. The features of the effect of oxygen jets on the removal of carbon, manganese, silicon and phosphorus from the melt are established. Based on the data of high-temperature modeling of the purge of the converter bath, the established methodology for calculating the main design parameters and experience in developing industrial structures of multi-tiered tuyeres, a three-tiered tuyere of the new design and a combined bath of oxygen and neutral gas for the 160-ton converters have been developed and proposed for industrial development . The practical implementation of the presented solutions will provide an increase in the technological and technical-economic indicators of smelting in comparison with the use of well-known developments in this field.

scholarly journals Physical and chemical processes in the cavity of the oxygen converter when burning the bath with the afterburning of exhaust gases

2019 ◽  
pp. 116-128
Author(s):  
A.G. Chernyatevich ◽  
L.S. Molchanov ◽  
V.V. Vakulchuk ◽  
B.Y. Yushkevich
Keyword(s):  
High Temperature ◽  
Carbon Content ◽  
Oxygen Converter ◽  
Slag Formation ◽  
High Carbon ◽  
High Carbon Content ◽  
Double Row ◽  
Exhaust Gases ◽  
Converter Bath ◽  
Temperature Modeling

The aim of the study is to study the characteristics of physicochemical processes in the cavity of an oxygen converter when purging a bath through two-tier tuyeres of various designs. The analysis showed that the classical designs of oxygen tuyeres equipped with tips with Laval nozzles do not always satisfy the requirements of the technology. The article presents the results of laboratory high-temperature modeling of the process of purging the converter bath through two-tier tuyeres equipped with tips of various designs. The studies were carried out on a multipurpose installation mounted on the basis of a 150-kg induction furnace and a 60-kg converter manufactured at a scale of 1:18 relative to 160 tons of an industrial unit. It is shown that the use of a two-tier lance provides additional advantages for the smelting process. So, in the initial and main periods of purging the converter bath through a two-tier lance with a double-row tip, it was possible to accelerate the process of slag formation without the addition of fluorspar, to intensify the removal of phosphorus at a high carbon content. Upon completion of the initial purge period at a low metal temperature of 1300-1330 ° C and the corresponding basicity of liquid slag, the degree of dephosphorization of 73.3-79.1% is achieved. When used for blowing two-tier tuyeres with double-row tips, the efficiency of afterburning of CO exhaust gases to CO2 also increases at the same decarburization rate of the bath. Based on the data of high-temperature modeling, the rational design of the two-tier lance has been determined, which ensures: balance of the heat balance; yield increase; creating conditions for the removal of phosphorus at a high carbon content; exclusion of negative effects on the lining.

scholarly journals How to approach a many splendoured thing: Proxy Technology Assessment as a methodological praxis to study virtual experience

2010 ◽  
Vol 3 (1) ◽  
Author(s):  
Lizzy Bleumers ◽  
Kris Naessens ◽  
An Jacobs
Keyword(s):  
Virtual Worlds ◽  
Technology Assessment ◽  
New Technologies ◽  
New Technology ◽  
Methodological Approach ◽  
Lessons Learned ◽  
Practical Implementation ◽  
Natural Setting ◽  
Functional Requirements ◽  
Virtual Experiences

This article introduces Proxy Technology Assessment (PTA) as a methodological approach that can widen the scope of virtual world and game research. Studies of how people experience virtual worlds and games often focus on individual in-world or in-game experiences. However, people do not perceive these worlds and games in isolation. They are embedded within a social context that has strongly intertwined online and offline components. Studying virtual experiences while accounting for these interconnections calls for new methodological approaches. PTA answers this call.Combining several methods, PTA can be used to investigate how new technology may impact and settle within people's everyday life (Pierson et al., 2006). It involves introducing related devices or applications, available today, to users in their natural setting and studying the context-embedded practices they alter or evoke. This allows researchers to detect social and functional requirements to improve the design of new technologies. These requirements, like the practices under investigation, do not stop at the outlines of a magic circle (cf. Huizinga, 1955).We will start this article by contextualizing and defining PTA. Next, we will describe the practical implementation of PTA. Each step of the procedure will be illustrated with examples and supplemented with lessons learned from two interdisciplinary scientific projects, Hi-Masquerade and Teleon, concerned with how people perceive and use virtual worlds and games respectively.

scholarly journals High-temperature multilevel sterilization of canned goods with heat recovery and its constructive and technological support

2021 ◽  
Vol 247 ◽  
pp. 01030
Author(s):  
Mafiiat Rakhmanova ◽  
Amiiat Demirova ◽  
Magomed Akhmedov ◽  
Faina Azimova ◽  
Irada Gadzhibekova ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Heat Recovery ◽  
Experimental Studies ◽  
Cooling Water ◽  
Practical Implementation ◽  
Canned Food ◽  
Significant Saving ◽  
Technological Support ◽  
Thermal Sterilization

New technical solutions improving the process of thermal sterilization of canned products through the use of multilevel high-temperature modes and heat recovery have been considered and proposed. The essence of the developed method lies in the fact that the heat released by cooling cans with the product that has undergone thermal sterilization is used to heat other cans with the product queued for sterilization. In this mode of heat treatment, except in the last stage, the heat emitted by cooled cans that have already undergone heat treatment is used to heat up the canned food. Hence, the use of the principle of heat recovery by cooling canned products in the baths where others are simultaneously heated provides a significant saving of heat energy and water. Depending on the temperature parameters at different stages of the heat treatment, the heat recovery rate can reach up to 90%. The method also provides savings on cooling water. For the practical implementation of the developed method, the design of the device for multilevel high-temperature thermal sterilization of canned food with heat recovery has been developed. On the basis of experimental studies, new, multilevel high-temperature modes of apple compote sterilization have been developed.

High-temperature modeling and characterization of 6H silicon carbide metal-oxide-semiconductor field-effect transistors

2005 ◽  
Vol 97 (4) ◽  
pp. 046106 ◽  
Author(s):  
Stephen K. Powell ◽  
Neil Goldsman ◽  
Aivars Lelis ◽  
James M. McGarrity ◽  
Flynn B. McLean
Keyword(s):  
Silicon Carbide ◽  
High Temperature ◽  
Metal Oxide ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
Temperature Modeling

Design & Analysis of Steam Drum Based on ASME Boiler and Pressure Vessel Code, Section VIII Div.2 & Div.3

2016 ◽  
Vol 852 ◽  
pp. 511-517
Author(s):  
Vishal Payghan ◽  
Dattatray N. Jadhav ◽  
Girish Y. Savant ◽  
Sagar Bharadwaj
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Pressure Vessel ◽  
Design Parameters ◽  
Plastic Collapse ◽  
Finite Element Stress Analysis ◽  
Process Plant ◽  
Section Viii ◽  
Design Requirements ◽  
Steam Drum

Process plant industries have equipment working on high pressure and high temperature environments. The ASME Boiler and Pressure Vessel Code, Section VIII provides rules for construction of the pressure vessel. The purpose of this paper is to have comparative study for design and analysis of steam drum using ASME Section VIII Div. 2 and Div. 3. Steam drum is a part of boiler system and works at high pressure and high temperature. Normally, Steam drum design is based on ASME Section VIII Div. 2, Part 4, design by rule and Part 5, design by analysis; which has been carried out in the present study. In this paper, design of the same equipment is studied using Part KD, Design requirements of ASME Section VIII Div. 3 with similar design parameters. Finite Element Stress Analysis of both design has been done as per code requirements to check the plastic collapse. In this study, it is observed that there is reduction in the required thickness for design based on Div. 3. Finally, the reduced required thickness leads to considerable weight reduction of the equipment and thus increased competitiveness.

Highway Tunnel Ventilation Technology Energy-Saving Assessment Based on Matter-Element Model

2013 ◽  
Vol 779-780 ◽  
pp. 611-614 ◽  
Author(s):  
Cheng Zan Chu ◽  
Chuan Zheng Zhu ◽  
Yao Wang
Keyword(s):  
Energy Saving ◽  
New Technology ◽  
Element Model ◽  
Objective Evaluation ◽  
Evaluation Index System ◽  
Three Dimensions ◽  
Tunnel Ventilation ◽  
Highway Tunnel ◽  
Saving Effect ◽  
Matter Element Model

In recent years, with the rapid increase of tunnel percentage in Midwestern highway construction, the tunnel operation cost rise quickly. In the cost, energy consumption of tunnel ventilation and illumination occupies a great proportion. In order to realize energy-saving and emission-reduction, there have been some new ventilation technology, for instance, the improved ventilation device, the improved ventilation method, and some new ventilation control technology. However after some new technology was applied, the phenomenon of energy-saving but not money-saving appeared. For the scientific and objective evaluation of highway tunnel ventilation technology energy-saving effect, construct evaluation index system from the three dimensions of technology usability, economy, and application effect, and then evaluate the energy-saving effect based on matter-element model. The result of assessment will give decision support for the later selection of highway tunnel ventilation technology proposal.

CFD Modeling of a Catalytic Flat Plate Fuel Reformer for Hydrogen Generation

2010 ◽  
Author(s):  
Kranthi K. Gadde ◽  
Panini K. Kolavennu ◽  
Susanta K. Das ◽  
K. J. Berry
Keyword(s):  
Flat Plate ◽  
Catalytic Combustion ◽  
Reaction Rates ◽  
Operating Conditions ◽  
Cfd Modeling ◽  
Design Parameters ◽  
Practical Implementation ◽  
Channel Height ◽  
Inlet Temperature ◽  
Two Dimensional

In this study, steam reforming of methane coupled with methane catalytic combustion in a catalytic plate reactor is studied using a two-dimensional mathematical model for co-current flow arrangement. A two-dimensional approach makes the model more realistic by increasing its capability to capture the effect of parameters such as catalyst thickness, reaction rates, inlet temperature and velocity, and channel height, and eliminates the uncertainties introduced by heat and mass transfer coefficients used in one-dimensional models. In our work, we simulate the entire flat plate reformer (both reforming side and combustion side) and carry out parametric studies related to channel height, inlet velocities, and catalyst layer thickness that can provide guidance for the practical implementation of such design. The operating conditions chosen make possible a comparison of the catalytic plate reactor and catalytic combustion analysis with the conventional steam reformer. The CFD results obtained in this study will be very helpful to understand the optimization of design parameters to build a first generation prototype.

A Development of Ceramics Cylinder Type Sulfuric Acid Decomposer for Thermo-Chemical Iodine-Sulfur Process Pilot Plant

2006 ◽  
Author(s):  
Hiroshi Fukui ◽  
Isao Minatsuki ◽  
Kazuo Ishino
Keyword(s):  
Sulfuric Acid ◽  
High Temperature ◽  
Liquid Phase ◽  
Ceramic Material ◽  
Structural Integrity ◽  
New Technology ◽  
Base Material ◽  
Production Method ◽  
Prototype Model ◽  
Operation Condition

The hydrogen production method applying thermo-chemical Iodine-Sulfur process (IS process) which uses a nuclear high temperature gas cooled reactor is world widely greatly concerned from the view point of a combination as a clean method, free carbon dioxide in essence. In this process, it is essential a using ceramic material, especially SiC because a operation condition of this process is very corrosive due to a sulfuric acid atmosphere with high temperature and high pressure. In the IS process, a sulfuric acid decomposer is the key component which performs evaporating of sulfuric acid from liquid to gas and disassembling to SO2 gas. SiC was selected as ceramic material to apply for the sulfuric acid decomposer and a new type of binding material was also developed for SiC junction. This technology is expected to wide application not only for a sulfuric acid decomposer but also for various type components in this process. Process parameters were provided as design condition for the decomposer. The configuration of the sulfuric acid decomposer was studied, and a cylindrical tubes assembling type was selected. The advantage of this type is applicable for various type of components in the IS process due to manufacturing with using only simple shape part. A sulfuric acid decomposer was divided into two regions of the liquid and the gaseous phase of sulfuric acid. The thermal structural integrity analysis was studied for the liquid phase part. From the result of this analysis, it was investigated that the stress was below the strength of the breakdown probability 1/100,000 at any position, base material or junction part. The prototype model was manufactured, which was a ceramic portion in the liquid phase part, comparatively complicated configuration, of a sulfuric acid decomposer. The size of model was about 1.9m in height, 1.0m in width. Thirty-six cylinders including inlet and outlet nozzles were combined and each part article was joined using the new binder (slurry binder) and calcinated. Final polishing of the flange faces established in the entrance nozzles was also satisfactory. Many parts were joinable using new technology (new binder). For this reason, new technology is applicable to manufacture of not only a sulfuric acid decomposer but the instruments in the IS process, or other chemical processes.

scholarly journals Preventing Patent Risks in Artificial Intelligence Industry for Sustainable Development: A Multi-Level Network Analysis

2020 ◽  
Vol 12 (20) ◽  
pp. 8667
Author(s):  
Xi Yang ◽  
Xiang Yu
Keyword(s):  
Artificial Intelligence ◽  
Sustainable Development ◽  
Network Analysis ◽  
Network Model ◽  
Industrial Development ◽  
Research Collaboration ◽  
New Technology ◽  
Technological Field ◽  
Electric Equipment ◽  
Multi Level

In recent years, assessing patent risks has attracted fast-growing attention from both researchers and practitioners in studies of technological innovation. Following the existing literature on risks and intellectual property (IP) risks, we define patent risks as the lack of understanding of the distribution of patents that lead to losing a key patent, increased research and development costs, and, potentially, infringement litigation. This paper aims to propose an explorative approach to investigating patent risks in the target technology field by integrating social network analysis and patent analysis. Compared to previous research, this study makes an important contribution toward identifying patent risks in the overall technological field by employing a patent-based multi-level network model that has not appeared in existing methodologies of patent risks. In order to verify the effectiveness of this approach, we take artificial intelligence (AI) as an example. Data collected from the Derwent Innovation Index (DII) database were used to build the patent-based multi-level network on patent risks from market, technology, and assignee perspectives. The results indicate that the lack of international collaborations among assignees and industry–university–research collaboration may lead to patent collaboration risks. Regarding patent market risks, the lack of overseas patent applications, especially the lack of distribution in the main competitive markets, is a key factor. As for patent technology risks, most of the leading assignees lack awareness of the distribution in the following technological fields: industrial electric equipment, engineering instrumentation, and automotive electrics. In summary, assignees from the U.S. with first mover advantages are still powerful leaders in the AI technology field. Although China is catching up very rapidly in the total number of AI patents, the apparent patent risks under the perspectives of collaboration, market, and technology will obviously hamper the catch-up efforts of China’s AI industry. We conclude that, in practice, the proposed patent-based multi-level network model not only plays an important role in helping stakeholders in the AI technological field to prevent patent risks, find new technology opportunities, and obtain sustainable development, but also has significance for guiding the industrial development of various emerging technology fields.

Sign in / Sign up

Export Citation Format

Share Document