This topic is one of research contents which 150t converter design of some steel mill includes.is the junction device of the converter furnace shell and loop. plays an important role during the process of converter. Besides fixing the furnace body sturdily in the circle, also can transfer the converter load safely to the loop and permit the furnace body to expand or contract freely in the radial and axial direction. However, in the steel-making process, the working condition of three-point sphere brace is extremely bad. Not only it must withstand gravity coming from the furnace shell and the molten steel . but also it must receive the heat convection influence as well as the impact load of converter in the process, so it is easy to be destroyed.According to the destroying reason of three-point sphere brace, this paper evaluates a multi-physical field thesis for key components of it using large finite element analyzing soft . The development work in the article includcs:(1) Setting out from the temperature environment of three-point sphere brace, carry thermodynamics analysis to underside sphere surface seat and under sphere surface pad. Having confirmed the temperature distribution of model, providing temperature distribution results for thermodynamics and coupling field analysis;(2) to carry the analysis on key components of three-point sphere brace .which consist of underside sphere surface seat and under sphere surface pad . Found out the unreasonable structure from the situation. Proposed the improvement program. The concentration reduces obviously after the analysis is recarried . I laving achieved the anticipated effect;(3) Considering the analysis of key component of three-point sphere brace to determine the natural frequency and the vibration form of the structure. Taking the essential measure to avoid nonessential losses as a result of resonance factor in the use process;(4) Carry on the harmony response analysis to key component of three-point sphere brace to calculate out the corresponding value of the structure under several kinds of frequencies functions and draw the corresponding value curve to frequency. Thus, we can forecast structural sustaining powercharacteristic and confirmation whether the design can overcome the harmful effect because of the vibrates which resonate, weary and so on causes.The research result indicates that there is tress concentration in three-point sphere brace during the process and it works out of resonance. The stability capability is very good.
Spray forming is a new-style technique for metal forming developing from 1960′s.has overcome the shortcomings of coarse grains and serious segregation in traditional casting process, and get rid of various working procedures and serious oxidation in powder metallurgy process, but also has the advantage of powder metallurgy technology, is a highly competitive rapid solidification process. But because of there are a great many of parameters in process, study this process through experiment directly is workload, high cost and long cycle. Using numerical simulation technology can solve this problem effectively.The shape evolution and model of was established in this paper, And use the shape evolution model modeling the shape evolution of in different parameters according to the deposition equipment of Baosteel , the following conclusions can be drawn: Use direct injection and single nozzle in , when the injection angle of nozzle is 0°,can’t form rod-billet, when the injection angle is 20°and 35°can form rod-billet; use direct injection and double nozzle in spray forming, can form rod-billet all, and the combination of nozzles of 20°and 35°is most instability. Use incline injection and single or double nozzle can form rod-billet all, but when the distance from the nozzle to the substrate is small, metal received rate will decreased significantly.The deposition billet process in two different parameters are simulated using model established,the following conclusions can be drawn: The temperature of the rod-billet formed by stable growth condition is even everywhere except at the bottom area, and the trend of temperature change to time change is similar, thus the billet has good performance; the temperature of the billet formed by unstable growth condition is difference except center area, and the cooling rate of top area and bottom area is greater than center area, thus the billet has poor performance.
Research on Long Campaign-service Cooling Stave with Heat Transfer Intensified by Spiral Fluidization and Its Scheme of Thermal Simulation Test
The service campaign of blast furnaces depends on their cooling equipments’campaign. Theis the most important factor in service campaign of s. Copper s have excellent quality of total heat transfer. With closed loop soft water cooling systems applied, their service campaign is up to the level of 15 to 20 years, but they cost huge.The intensified by is studied on in the paper. The technical principle of lies in installing s within flow channels, which guide cooling water flowing in spiral streamline. The fluidization particles with volume concentration of 2 percent are injected in need of cleaning. When cleaning, the particles flow spirally together with cooling water. Most of particles flow spirally on cylindrical surfaces of flow channels with the action of inertial centrifugal force. So the is removed quickly and uniformly. Experimental researches on spiral fluidization, the core technology of the stave, are performed for the first time in the paper. And their results show that only costs 145 seconds to remove the artificial fouling on inner walls of flow channels. In addition, they also reveal that convective heat transfer coefficient between cooling water and inner walls is intensified for more than 50 percent, and that the total flow resistance is equal to 48.7kPa which is lower than total pressure of supply water.The method of theoretical calculation combining with numerical simulation and experiment is applied while researching. The results of theoretical calculation based on heat transfer show that the total heat transfer coefficient from inner wall of cooling tube to hot surface of the stave is 40.7 percent of copper stave’s, 14 times of cast-iron stave’s and 5.1 times of widely-used cast-steel stave’s. While simulating, solution models are created by GAMBIT, and by FLUENT are performed numerical simulation on heat transfer magnitude intensified by spiral fluidization through discrete phase model and temperature field of the stave through 3-dimension steady segregated solution. Results of numerical simulation show that in comparison with tubes without any inserts in, the enhanced magnitude of convective heat transfer is up to 40.4 percent. They also reveal that is under safety temperature during the stage with fins worn down completely even if there is no slag sticking on hot surface, and that the highest temperature on hot surface is only 85.7 degrees on the condition that a layer of slag thick 30mm uniformly sticks on .In the end, an experimental theme in thermal simulation, performed in slag notch, is researched and put forward for the first time to test the temperature on hot surfaces, period of forming slag and distribution of slag. It has many remarkable advantages such as short test period, low cost, easy operation, safety and reliability, and so on.
With the increasingly strict requirement of users on the sulfur content in steel,the theory and technology of clean steel deep desulfurization has been the focus of some research.To produce ultra-low sulfur clean steel,couldn’t be achieved only by secondary refining,but by controlling the sulfur content during each smelting process, and must according to the sulfur content of different steel type to choose the proper refining process.This paper under the enhanced desulfurizer to improve the performance of slag infiltration desulfurization process,developed a new type of desulfurizer.Through experiments on resistance furnace,we investigated the reaction mechanism in the ultra-low-sulfur-steel,and analyzed the key factors on elective desulphurization.This investigation provides the theatrical direction for the production of new ultra-low-sulfur-steels.This paper deals with sintering technology and desulphurization ability of new refining slag of 12CaO·7Al2O3,which has been opened up by foreign country in past two years,and investigated desulphurization ability of premelted slag. According to some diferent trial procedures,we did the thermodynamic balance trials and desulphurization tirals,and got the conclusions as follows.The has lower melting temperature and better fluidity in refining temperature on the base of low melting point phase 12CaO·7Al2O3.Because of high basicity and Al2O3 content,the slag system has high desulphurization ability,its desulphurization ability is highly improved by adding a lot of lime in course of refining process,especially fits to Al-deoxidization steel desulphurization. The premelted slag containing CaC2 or BaO has satisfied the requirement of or free-fluoride,and which is harmless to the environment.The has the good desulphurization capability.Furthermore,the which has the high desulphurization speed could satisfy the requirement of high production rhythm in practice and its fit for the slag infiltration of ultra-lowsulfur-steels.The desulphurized slags which we researched has wide resource and low cost,its easy to storage and transport.
Zinc Hydrometallurgy is the most important method to produce zinc. The zinc electrowinning is a important procedure in zinc electronic deposition, whose Economic Index reflects the technical level of zinc smelting. The power consumption of the zinc electrowinning takes up 70% of the general energy consumption. The operation, technology and economic target of the zinc electrowinnin not only reflects the quality of Zinc Hydrometallurgy, but also the power consumption. To ensure sustainable development, the country has unveiled a series of concrete measure.makes difficult for local companies to enter the industry, which brings in more difficulty for industry expansion. More and more companies must have technical reform in order to improve electric energy using status and reduce power consumption.The electric energy of anodic reaction takes up 60% in the process. So is important to choose the anode materials. Insoluble anodes were employed in the zinc tank. Nowadays, binary alloy anode plate and multi-alloy anode plate are commonly used. They can meet the requirement of the production, but the effectiveness and cost are not the same.How to select anode materials in production process is an important period. The performance characteristic of binary alloy anode plate and multi-alloy anode plate is analyzed by experiment in production groove, the amount and component of zinc separating out, the electric energy of consumption, the thickness and weight of anode electrode and useful time of anode electrode plate are researched with emphasis. Through the characteristic comparison of two kinds of anode electrode plate, the different of comprehensive characteristic in binary alloy anode plate and multi-alloy anode plate is realized. The temperature of electrolyte and the concentration of Mn2+ are also discussed. It can say that the concentration of Mn2+ is the main reason for characteristic change of anode electrode and high electric energy consumption, the targeted measure is given in controlling the temperature of electrolyte and the concentration of Mn2+.The research results can guide to develop the new anode materials. It can be used to choose scheme of zinc electrowinning in the transformation projects.
Zinc is one of the important nonferrous metals. China is the world’s leading zinc producer. Nowadays, the consumption and production of zinc are respectively increasing year by year. Zinc smelting industries are generally facing a conflict between the increasing demand for zinc and the shortage of. Changeful and high miscellaneous will become the main raw materials of zinc smelting. The use of Changeful Zinc Concentrate will have a direct impact on the production conditions of zinc hydrometallurgy process. Fluidized is an important process during the Zinc Smelting. The operating conditions such as temperature, roasting time, the ratio of wind to material and the exports’ pressure of fumes will have an important impact on the quality of zinc calcine. is related to normal operation of the whole zinc hydrometallurgy process.Firstly, the main existing problems, new progress and the developmental orientation of zinc hydrometallurgy process are discussed in this paper. Then there is a focus on the changes of fluidized roasting process for zinc and associated elements. The thermodynamics and kinetics of fluidized roasting process are studied, and the Mechanism of zinc ferrite formation is analyzed. points out that the formation of zinc ferrite is the main factor which affects the quality of zinc calcine. At the same time a way to reduce zinc ferrite generation is proposed.Based on collecting samples and data of roasting production on the production site and the theoretical analysis, the influence factors for the rate of soluble zinc, soluble iron, soluble sulphur and soluble silicon dioxide are studied. When the Zinc Concentrate have complex sources, the prediction BP between material constituent, technological conditions and above zinc calcine are established. The BP can predict the quality of zinc calcine, and can play a guide role in adjusting the roasting process operating parameters. There is no determined theory or method in choosing the number of hidden layer nodes in . In this paper an optimization algorithm based on the principle of golden section is adopted to design the number of hidden layer nodes in neural network. By adopting traingdm function (momentum gradient drop the back-propagation algorithm) to train BP network, by comparing the predictive indexes with industrial data, and by drawing a conclusion that the predictive effect is good, neural network can be predicted accurately to set up prediction network.By designing the BP neural network the problem of hard establishment for mathematical model between technological conditions and the quality of zinc calcine is solved. So it is a meaningful attempt at zinc fluidized roasting process.
is an important measure to increase the pulverized coal injection (PCI) for reducing the coke ratio and production cost of iron-making in the blast furnace (BF) production. However, as the greatly increasing of the coal injection ratio, the measure appears many problems such as the unburned coal powder increasing before the tuyere, permeability deterioration in a certain condition of burden, etc. By taking measures to enhance combustion of pulverized coal (PC), the coal powder can burn faster in the tuyere. By adding the appropriate amount of combustion-supporting agent on pulverized coal injection for BF, and combining with measures such as blast furnace operation, the ignition temperature of coal powder to furnace can be decreased, the combustion efficiency be improved, the coke ratio of BF and production cost of iron-making be decreased accordingly.In practice of increasing the PCI of YiCheng steel company, along with the increase of the coal injection ratio, many problems were found, such as decline in burning rate of pulverized coal, increase in the carbon content of blast furnace Gas Ash. According to actual condition of iron manufacture in YiCheng steel company, by using the methods of theoretical analysis and experimental research, the practical production to seek for the suitable combustion-supporting agent on PCI for BF in YiCheng steel company was studied; meanwhile, some suggestions were given to the reasonable industrial production for BF in YiCheng steel company.Through the two stages of the development in laboratory and the industrial production of combustion-supporting agent on PCI for BF, conclusions are as follows:(1)The laboratory result showed that the combustion properties of PC can be improved obviously by adding combustion-supporting agent, and the addition of the second formula has the best effect. By the addition of the second formula in 0.4%, the ignition temperature of PC decreased 24℃, the burning completely temperature decreased 51.5℃, and the relative completed burning time reduces 15.4%. Meanwhile, the calculation of exothermal area on DSC curve method was used to compare and analyse the influence when the combustion catalyst was injected into the PC, the results showed that the addition in 0.4% has the best effect, and the combustion properties has a downward trend over 0.4%.(2) By increasing the proportion of PC at -200 mesh and improving oxygen-enriched rate, the combustion properties of PC can be improved more favorable, and the combustion-supporting effect can be given more fully play. The laboratory result showed that a better combustion efficiency has been achieved in the condition of 70% pulverized coal -200, 3% oxygen-enriched rate and 0.4% combustion-supporting agents blending rate.(3) was found that in the industrial production of combustion-supporting agent on PCI for BF in YiCheng steel company , the coal injection rate and the coal injection effect has a great improving by adding with the combustion-supporting agents. Meanwhile, the ignition temperature of PC was decreased; the combustion rate and the combustion efficiency were improved. Though the expected goal of the experiment has be achieved basically, it is also needed more industrial production practice for master the coal injection influence of blast furnace operation and the grade of raw mineral. And the next goal is designing a suitable equipment and process of combustion-supporting agent on PCI for BF.
In the construction process, the progress and quality management,(cost), security management tied one of the four, and quality is fundamental, is the key, security is protected and progress is the core, is to ensure that the investment income on time Decisive factor, no progress of the project, other work on the management did not object. For different construction projects, its management methods will have some differences, the need to combine theory with practice, constantly sum up experience and lessons.In a joint venture in the iron and steel, BF most complex and difficult also the largest. In this paper, the construction progress of the blast furnace project management, use of the progress of construction project management theory and application systems theory, operational research and network technology approach, combining features of the blast furnace systems and construction experience, from the progress of the preparation of plans, implementation, Check and adjust to a more systematic study. In this paper, the results include the following:1、the blast furnace project in the construction of the structure of the decomposition of the system, and considered the working relationship on the basis of a blast furnace project summarized the progress of the construction methods.2、through the implementation of the scheme to progress in the process of Jiaodi, responsibilities, programmes and measures to study the progress of plans to blast furnace construction project in the process of management methods. 3、plans to check the progress, need to collect, collate, compared to the actual analysis of specific data, and the progress of the adjustment of principles and plan corrective methods, on the steps.For the above three areas, use of Zhangjiagang in Jiangsu Sha-Steel, Acer # 3 blast furnace steel-making Co., Ltd. (2500 m~3) works were carried out as an example of the positive note, with a view to the blast furnace project management of construction progress can play a reference.
In modern continuous metal cast process, the quality of liquid steel is the promise of that of the steel products, while the slag is the main cause of pollution of liquid steel ,is very severe to prevent slag from flowing from one process to the next process ,that just is Slag Detecting ,which includes two main phases: converter-ladle slag detecting and ladle-tundish slag detecting. This subject focuses on the later.According to the existing slag detecting method based on infrared image, we came up with our own approach in this dissertation, which paid more attention on processing the infrared image of the surface of the tundish ,and then calculated the character when slag emerges, which made the criterion of the wholesome detection.In this dissertation, reasonable presumption was made on the character of the object’s infrared image, and according such presumption, image was weighted ,by which, meaningful signal was intensified, while redundant signal was depressed. Then algorithm for feature extraction based on of images was developed.This dissertation intended mainly on theoretical research, in which we proposed some presumption, extracted some models of movement of slag, did some physical experiments. On the whole, this dissertation made some necessary exploration ,and will have some guiding significance in some extent.
This thesis is based on the No. 2 blast furnace(BF) of the Baosteel Group. Here, we put thetheory into practice and fulfilled its use in the maintenance of blast furnace equipment.The Baosteel Group is the biggest and most advancing iron-steel company in China. Most of the BF maintenance practice are based on the theory of CBM and AM nowadays. Although there are many obvious traits in this kind of maintenance program, is impossible to give attention to both sides of integrity and cost. However, the method can meet very well.In the thesis, we firstly introduce the RCM theory, then we put to the full use of analysis of equipment of Baosteel No.2 BF, and lastly we got a whole RCM program on equipment of BF. As the core of the iron system, the BF has a large number of equipment, and some advanced instruments are technical protected, so it is impossible to analyze every piece of equipment here. Provided this condition, we just discuss the key parts of BF. The main coverage includes dust system, cooling system, gas supply system, refractory etc. Besides ,we has centered on the core part of RCM–decision table. But for the sake of integrality of maintenance program, here we introduced the principles of other necessary parts, including construction of the data, combination of repair works. But those are not only appeared in RCM program, so this part of work is rather summary.Through the RCM analysis on equipment of ,comparing the exist practice,we found that new maintenance method can not only improve the reliability of equipments with dangerous failure affect, but also prolong the service life of the whole equipment of BF under the asked safety.