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Khrapach Alexander

Faculty of Mechanical Engineering and Engineering (CST)

Department of mechanical equipment of ferrous metallurgy plants (CE)

Speciality Research and perfection of the system of unloading lime shaft kiln

Research and perfection of the system of unloading lime shaft kiln

Scientific adviser: Ph.D., Professor Eronko Sergey

Resume Abstract

Содержание

• Introduction
• 1. GOAL AND TAKS OF THE RESEARCH
• 2.DEVELOPMENT AND IMPROVEMENT OF DISCHARGE SHAFT KILN
• 3. PHYSICAL MODELS OF DISCHARGE
• 4. PRACTICAL APPLICATION DEVELOPMENT RESULTS AND CONCLUSION
• Source List

Introduction

Lime is known not only as a building material, and of flux used in metallurgical processes for the removal of iron and steel of phosphorus. Lime obtained by firing limestone in special furnaces or rotary shaft type. Shaft furnaces currently performs rotor. With a variety of benefits itself shaft furnace operates in a stable regime in the case of unloading from it fire lime uniformly carried out with a given performance. These characteristics depend on the design and reliability of operation of the device allows the discharge of the material to the receiving hopper.

2. GOAL AND TAKS OF THE RESEARCH

Development of an approach to the unification of synthesis Moore FSM, directing on hardware amount reduction in FPGA is the goal of research.

Main tasks of the research:

1. Analysis methods of minimization amount of states in completely and incompletely specified Moore FSM.
2. Estimation ways of hardware amount reduction with the help of encoding states of Moore FSM.
3. Search and detection characteristics of existing construction methods of logic circuits of Moore FSM and estimation possibilities of their use on FPGA.
4. Association of functionally different optimization directions of Moore FSM hardware amount into the unified approach to synthesis and formation recommendations for it's use.
5. Design of alternative variants of basic stages of unified Moore FSM synthesis process and estimate of it's efficiency.

2.DEVELOPMENT AND IMPROVEMENT OF DISCHARGE SHAFT KILN

Employees of the department MOZCHM Donetsk National Technical University, an apparatus for unloading shaft kiln equipped with a table, committing plane-parallel motion relative to its body. Apparatus (Fig.1) includes at 1 mounted with clearance relative to the shaft 2 on the rolling elements 3 placed in the recesses of supporting brackets 4 fixed uniformly on the perimeter of the inner cylindrical surface of the hopper 5 adjacent to the bottom of the shaft furnace and provided with a hinged door 6 . Above the central part of the hearth 1 in the gap between it and the lower end of the shaft 2 is placed a conical cap 7 rigidly connected with the housing of the furnace, to which 8 knives are attached with an adjustable angle of attack, are uniformly dispersed around the perimeter of the upper plane of the hearth 1. In the lower abutment surface a hearth formed two cylindrical openings in which are mounted for relative rotation of the fingers 9,10, each of which is rigidly fixed to the toothed wheels, respectively 11 and 12, mounted horizontally on vertical axles 13 and 14. Pins 9 and 10 are displaced in the same direction by the same distance from the vertical axis 13, 14 of gears 11, 12. Both of these wheels have the same dimensions and are synchronized with each other placed on one line of their centers of the driving gear 15 through the bevel gear 16 associated with the motor - reduction gear 17 fixed on the outer the surface of the hopper 5. Bearing Supports all the gears are placed on a support frame 18 mounted on the supporting stand 19..

The device operates as follows. After firing its lime pieces lie on the cover 7 of the top surface of the hearth 1, lying on its perimeter at an angle of repose and completely filling the gap between the hearth and the bottom of the shaft furnace 2. After opening the valve 6 and the switching motor - reduction gear 17, the rotation of its output shaft 16 through the bevel gear pinion 15 is transmitted, which results in a synchronous rotation of the gear wheels 11 and 12 on vertical shafts 13 and 14, bearing supports arranged in the support frame 18. However, the wheels 11 and 12 about the axes 13 and 14 will perform a rotational movement, vertical fingers 9 and 10 are located in cylindrical bores made in the lower support surface of the hearth 1. Due to the fact that the pins 9 and 10 are displaced by the same distance in one direction relative to the axis 13, 14 of gears 11, 12 rotating synchronously in the same direction, one will make a plane-parallel movement on the rolling elements 3 relative to the support arms 4 and the blades 8, as shown in FIG. 2, whereby the lime layer thickness equal to the gap between the bottom of the shaft 2 and the hearth 1, is nominated in a circle from the outlet opening of the annular shaft to the periphery of the hearth in the location area of knives 8 which are at a predetermined angle of attack will be reset in the material receiving hopper 5. According to the authors, the proposed device for unloading silo lime-gas furnace will increase the uniformity of the material issue, as it will be unloaded in a continuous mode with simultaneous discharge of all the blades around the perimeter of the movable hearth. Device for unloading of a shaft furnace equipped with mobile scrapers.