1、外文翻译 New Technique of Blast Furnace Pre-Launch Research V. I. Bolshakov, V. V. Lebed, A. A. Zherebetskiy Z.I. Nekrasov Iron & Steel Institute of National Academy of Sciences of Ukraine 1Academician Starodubov Square, Dnipropetrovsk 49050, Ukraine The methods of pre-launch experimentations of charge
2、mechanical trajectory in shaft topspaceand its emplacement on the stock surface during the loading by bell-less top chargingsystem are examined. The methodical bases of pre-launch experimenting with the usage of laser rangefinder are presented. Keywords: BLAST FURNACE, PRE-LAUNCH RESEARCH, CHARGE ME
3、CHANICAL TRAJECTORY, MATERIAL CRESTS EMPLACEMENT ON THE STOCK SURFACE Introduction The improvement of charging materials distribution on the shaft top is important for growth of blast furnace operation efficiency 1, 2. In present time blast-furnace operator have accumulated a large experience and ma
4、ny methods of loading with the help of bell-type feeding mechanisms, however the possibilities of charge distribution control during the furnace loading with the help of bell-type distributors are rather limited 1. During the charge loading from the bell the trajectory of the charge is nearly consta
5、nt, thus the change of stock level is practised for crest location shift. The radial distribution of ore loads on the shaft top is defined by the shift of charge materials on the stock profile slope. The usage of bell-less top charging system with chute distributors located over the stock surface le
6、d to essential expansion of technological opportunities of the feeding system for forming of reasonable distribution of the materials on the shaft top. During the charge loading by chute distributor the charge mechanical trajectory can be changed by chute slope adjustment. The knowledge of material
7、flow peculiarities in the shaft top space is required for effective realization of technological capabilities of bell-less top charging system for charge distribution control. The technique of calculation of charge movement from the chute distributor 4 developed in Iron & Steel Institute allows defi
8、ning charge materials mechanical trajectory and choosing chute slope working angles. However, the complication of accurate values in defining of some initial calculation data (mainly, friction ratio) leads to the necessity of correction of trajectory calculation results according to the data of pre-
9、launch research. The Institute has accumulated the significant experience of pre-launch experimentation and results of their processing. It allowed increasing essentially the estimates reliability of charge flow mechanical trajectory and he effectiveness of choosing the reasonable working angles of
10、chute slope. In the world practice the active tendency development of equipping the blast furnaces of different capacity with bell-less top charging systems required different constructive solutions. It increased essentially the urgency of thorough pre-launch experimentation and required the improve
11、ment of methods and instruments for their accomplishing. Many years experience of implementation ofnew and modernized blast furnace technologies and equipment with the usage of justified estimation of reasonable loading programs based on pre-launch research results confirmed the essential accelerati
12、on of furnaces withdrawal of project rates 1, 2. The research was aimed on the generalization of existing methods of pre-launch investigations, development and testing of new technique using modern measuring tools. Results and Discussion The technique of estimating the trajectories of the charge mat
13、erials flow in furnaces with bell type feeding mechanism consisted in defining of the location range of cross points of charge flow with shaft top protection. The first pre-launch experiments on blast furnaces with bell-less top Science of Machines Metallurgical and Mining Industry, 2011, Vol. 3, No
14、. 3 charging system (BF-6, Novolipetsk Steel； BF-9, JSC “Kryvorizhstal”) in the USSR done by the scientists of Iron & Steel Institute in 1978-1979 included similar technique with the help of gauging rods which were sunk through gas outlet before the discharge of research samples from definite angle
15、of chute position 5. The specified method of charge trajectory estimation due to its comparative simplicity and sufficient reliability of the data obtained is used even in present time. However, its disadvantage is impossibility of definition of trajectories which correspond to material load into pa
16、raxial and intermediate zones of shaft top radius. There was often lack of the data obtained by traditional researches for valid choice of reasonable parameters of loading mode. Thus, it needed development and usage of principally new research methods and equipment, allowing increasing the volume an
17、d reliability of the obtained information. The research workers of Iron & Steel Institute constructed a special installation for charge materials distribution on the blast furnaces of large capacity equipped with chute bell-less top charging system. It enabled to register the width of charge flow du
18、ring its moving within the shaft top space and also to select the materials into the cells for their further weighting, screening and analysis of weight distribution and particle granulometry. After the installation of the P.Wuerthe Company chute bell-less top charging system, the first investigatio
19、ns with the help of this original system were completed in 1979 on the blast furnace No.9 with the capacity of 5034 m3 at JSC “ Kryvorizhstal”. The results of these investigations have not been published for more than 20 years according to the decision of Ministry of Ferrous Technology. The second s
20、imilar investigation was carried out at JSC “Severstal” on BF-5 with the capacity 5580 m3 in 1986. According to results, we obtained unique experimental data about the material flowparameters: flow width, distribution of intensity and granulometric composition 6, 7. The scheme of research equipment
21、installation is shown on Figure 1. The research mechanism of original construction was used during the experiments. Before the discharge of the investigation portions the console of mechanism situated on the shaft top platform was injected into the shaft top space along the furnace radius through the fitting hole. The working part of machine 2.6 m long consisting of 13 cells was installed at the angle 45 to the horizon and blocked
