RU2630992C1 - Loading and distribution device of uniflow and counterflow regenerative furnace with round shafts for sintering lumpy carbonate material - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention is related to loading and distribution shaft devices, mainly uniflowflow and counterflow regenerative furnaces with round shafts for sintering carbonate materials and can be used in metallurgical, construction, chemical, food and other industries. The loading and distribution device of the uniflow and counterflow regenerative furnace with two round shafts for sintering lumpy carbonate material consists of a common hopper standing on furnace bearing frame and connecting loading openings of said shafts by means of inclined chutes. The intermediate hoppers are located under the loading holes of the shafts and equipped with rotation drives relative to the axis of the shafts and there are fixed tables located under the intermediate hoppers with a gap that exceeds the maximum size of the processed pieces of material. The brakets with baffles are located under the edge of each fixed table and rigidly fastened to the outer walls of the intermediate hoppers and the fixed tables are provided with a gap.

EFFECT: improved quality of sintered lime and furnace efficiency.

3 cl, 2 dwg

Description

The invention relates to loading and distribution devices of mine, mainly direct-flow countercurrent regenerative furnaces for calcining carbonate materials, in particular limestone, and may find application in metallurgical, construction, food and other industries that use quicklime.

In the production of high-quality quicklime in mine direct-flow countercurrent regenerative furnaces, the uniformity of the distribution of large and small pieces over the mine cross section, as well as their continuous loading into the furnace, is of great importance. These conditions are provided, mainly, by the design of the loading and distribution devices, which for each type and type of shaft furnaces have been developed and manufactured quite a lot. However, the problem of creating loading and distributing devices for direct-flow countercurrent regenerative furnaces containing at least two round shafts, ensuring uniform distribution of material over their entire cross-section with continuous and controlled loading of limestone during its calcination, has not yet been generally resolved .

It is known a device for loading at least two shafts of a furnace for burning carbonate materials, which contains a common loading hopper connected by outlet through leaks to each shaft. The common loading hopper is equipped with a funnel connected to a lock chamber having a shut-off valve actuated by a lever-mechanical system. Similar valves with dampers are mounted in heat, connecting the feed hopper with the inlet openings of the furnace shafts. Firing material is fed into the feed hopper by a conveyor. Devices and mechanisms for uniform distribution of calcined material throughout the cross section of the shaft of the furnace in this invention is not provided. Therefore, due to the segregation of pieces of material with different sizes over the cross section of the mines, their heat treatment will be uneven. As a result, the high quality of the finished product cannot be obtained (see US patent No. 4708643, C04B 2/12, F27B 1/20, publ. 11/24/1987).

Also known is a loading and distributing device of a direct-flow countercurrent regenerative furnace with at least two round shafts, comprising a conveyor belt feeding preliminary material for firing to a distribution second conveyor with a changing direction of movement of its belt, intermediate hoppers rotating during their loading by a distribution conveyor, made with the possibility of lowering them into the corresponding loading openings of the furnace shafts, overlapped by the upper locking elements and. The material is loaded into the furnace in batches periodically during the switching of the heating of the mines. For uniform distribution of pieces in the mines, a rotary distributor in the form of a plate is provided. The plates are rotated periodically after each emptying of the hoppers (Fig. 4), (see RF patent for invention No. 2353595, C04B 2/12, A27B 1/02, publ. 04/27/2009)

The main disadvantage of this loading and distribution device is the design complexity, a large number of mechanisms and the inability to continuously load the counterflow shaft of the furnace during the heating mode in order to regulate and maintain the temperature of the exhaust gases within specified limits. In addition, when pouring and transporting carbonate material from one element of the device to another, located outside the cavity of the furnace, significant dust emission occurs, to suppress which it is necessary to use complex shelters and suction of dusty air (Fig. 4).

Also known is a loading and distributing device of a direct-flow countercurrent regenerative furnace, comprising a receiving hopper fixed to the furnace main body and connected through shutters to two intermediate hoppers, the outlet openings of which are connected through airtight valves to the inlet openings of the shafts. Valves are airtight butterfly valves with actuator. Each intermediate hopper of the furnace loading and distributing device is connected by a system of pipelines and valves to a receiving hopper and a shaft, which makes it possible to equalize the pressure of the intermediate hopper and the shaft to the ambient level and to carry out batch loading of the calcined material in a particular shaft during firing. The entire loading and distribution system is hermetic and does not require the use of complex shelters and suction dusty air suction (see Italian application PCT WO 2006/070424, F27B 1/00, F27B 1/20, C04B 2/12 publ. 06.07.2006, prototype).

The main disadvantage of this loading device is the lack of nodes for uniform distribution by size of fractions of lump material over the cross section of the shaft, which makes it impossible to obtain high and stable quality of calcined lime in round kilns of high productivity. In addition, the loading of material is carried out in large portions, which does not allow to regulate and properly maintain the temperature of the exhaust gases within the specified limits.

The objective of the invention is to achieve improved quality of lime and to be able to regulate and maintain within the specified limits the temperature of the exhaust gases while maintaining the existing advantages inherent in the considered analogues, namely the tightness of the loading and distribution system and ensuring uniform distribution of the feedstock over the mine section . The ability to maintain the temperature of the exhaust gases within specified limits allows you to increase the duration of the heating cycle and thereby increase the productivity of the furnace by increasing the fraction of the heating time of the furnace.

The technical result - improving the quality of calcined lime due to the uniform distribution of various pieces of calcined carbonate over the entire cross section of the mines, as well as increasing the productivity of the furnace by adjusting and maintaining the temperature of the exhaust gases within the specified limits, is achieved by the fact that intermediate bunkers are installed under the loading openings of the mines equipped with rotation drives relative to the axis of the shafts, and fixed tables located under the intermediate hoppers with a gap greater than the maximum flaxly processed pieces of material. At the same time, brackets enclosing with a gap, fixed with a gap, are rigidly attached to the outer walls of the intermediate bins, which are equipped with chippers located under the edge of the fixed table, some of the chippers inclined to the center of the furnace, and the other part to the periphery of the furnace. For the convenience of controlling the process of firing carbonate material in the furnace, the drives of the intermediate hoppers are equipped with speed and direction of rotation control, and the volume of the total loading and intermediate hoppers in terms of the capacity of the carbonate bulk material are equal.

The present invention has novelty, since the totality of all the features of its formula by the applicant in the sources of patent and general technical information is not found.

The proposed technical solution has an inventive step, since the claimed layout of the device, in which the distribution part of the material loaded evenly over the entire cross-section of the shafts, is placed inside these shafts and made in the form of rotating bins with installed chippers and fixed tables, is not obvious.

The industrial applicability of the loading and distribution device is feasible, since the common loading hopper, rotating hoppers, valves, estrus, fixed tables and other structural elements can be manufactured using well-known metalworking processes, welding production and industrial materials.

The invention is in the preliminary design stage.

The invention is illustrated by drawings, in which in FIG. 1 shows a diagram of a General view of the loading and distribution device, and in FIG. 2 is a section along AA in FIG. one.

The loading and distributing device of the furnace with two round shafts for firing carbonate bulk material consists of a common loading hopper 2 supported by a supporting frame 1, connected by inclined chutes 3 and 4 through valves 5 and 6, equipped with actuators 7 and 8 and placed in airtight boxes 9 and 10, with estruses 11 and 12, the outlet openings 13 and 14 of which are connected to the feed openings 15 and 16 of the furnace shafts 17 and 18. In the furnace shafts 17 and 18, under the feed openings 15 and 16, rotating distribution bins 19 and 20 are equipped with drives 21 and 22 of their symmetrical rotation relative to the axis of the said shafts. Under the distribution hoppers 19 and 20 there are fixed tables 23 and 24 with a gap 25, which is more than the maximum processed pieces of material. At the same time, brackets 28 and 29 are rigidly attached to the outer walls 26 and 27 of the distribution hoppers 19 and 20, covering the fixed tables 23 and 24 equipped with chippers 30 and 31, which have different lengths. For a uniform distribution of pieces of carbonate material of various fractions, the chippers 30 are directed to the center of the furnace, and the chippers 31 are inclined to its periphery (Fig. 2). Drives 21 and 22 with their vertical shafts 32 and 33 are rigidly connected to the beams 34 and 35, mounted on the inner walls 26 and 27 of the distribution hoppers 19 and 20 and equipped with speed controllers and the direction of rotation (not shown in Fig. 1).

The loading and distributing device of the furnace with two round shafts for calcining carbonate materials works as follows.

From a common loading hopper 2 filled by any known method, lumpy carbonate material is able, under its own weight, to flow into estrus 3 and 4 with open valves 5 and 6 through airtight ducts 9 and 10, estrus 11 and 12 and feed holes 15 and 16 into distribution hoppers 19 and 20 and further to the shafts 17 and 18. So, with the open valve 5 driven by 7, the carbonate material from the hopper 2 will be sent through an airtight duct 9, estrus 11 and the feed hole 15 to the distribution hopper 19, which will completely fill I when the discharge hopper 2 and 3 heat and 11 empty. After that, the valve 5 closes and carbonate material due to the rotation of the distribution hopper 19 from the actuator 21 through the gap 25 between the fixed table 23 and the distribution hopper 19 enters the bumpers 30 and 31 and is loaded both towards the center and the periphery of the shaft along concentric circles. The rotation of the distribution hopper 19 allows not only to unload it, but also to evenly distribute the bulk material in concentric circles along the furnace cross section, despite the segregation or uneven distribution of pieces of material of different sizes inside the hopper when it is loaded.

The loading of carbonate material for firing into the shaft 18 is carried out in a similar manner along the following process chain with valve 6 already open: from the loading hopper 2, through the airtight duct 10, estrus 12, the loading hole 16 into the distribution hopper 20, and then through the gap 25 from the guiding chippers 28 and 29 to the mine 18. The unloading of the hopper 2 is carried out each time during switching the heating of the mines, and unloading from the intermediate bins 19 and 20 is during the heating of the mines, and the rotation speed of the bins is adjusted taking into account keeping within the specified limits the temperature of the exhaust gases. For a more uniform distribution of pieces of material over the cross section of the shafts, the direction of rotation of the intermediate silos is changed each time they are emptied or the heating of the shafts is switched.

The proposed design of the loading and distribution device of the furnace with two round shafts has a layout scheme that is distinctive from other devices of a similar purpose, which allows to improve the quality of finished products, simplify operation and increase the productivity of the furnace.

Information sources

1. USSR Copyright Certificate No. 1589012, F27B 1/02, publ. 08/30/1990

2. USSR Author's Certificate No. 775578, F27B 1/20, publ. 10/30/1980

3. Utility model of the Russian Federation No. 143558, F27B 1/00, publ. 07.27.2014

4. Application for utility model in Belarus No. 200440272, F27B 1/02, publ. March 30, 2005

5. RF patent No. 2525957, F27B 1/20, publ. 08/20/2014

6. RF patent No. 2079804, F27B 1/20, publ. 05/20/1997

7. EP No. 0088253, publ. 1983 year

8. DE No. 4,043,315, C21B 7/20, publ. November 28, 2002

9. US No. 4708643, C04B 2/12, F27B 1/20, publ. 11.24.1987

10. EP 1555251, F27B 1/02, C04B 2/12, publ. 02/18/2009

11. WO 2006/070424, F27B 1/20, C04B 2/12 publ. 07/06/2006

Claims (3)

1. The loading and distributing device of a direct-flow countercurrent regenerative furnace with two round shafts for calcining carbonate lump material, consisting of a common loading hopper resting on the supporting frame of the furnace, connected by inclined chutes through hermetic valves with loading openings of the said shafts, characterized in that under loading openings of mines are equipped with intermediate bunkers equipped with rotation drives relative to the axis of the mines, and fixed tables located under the intermediate and bins with a gap that exceeds the maximum size of the processed pieces of material, moreover, brackets with bumpers that are located under the edge of each stationary table are rigidly attached to the outer walls of the intermediate bins with a gap fixed on the gap. 2. The loading and distribution device according to claim 1, characterized in that part of the chippers is inclined to the center of the furnace, and the other part to its periphery. 3. The loading and distribution device according to claim 1, characterized in that the drives of the intermediate hoppers are equipped with speed and direction of rotation controls.

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