RU2211404C2 - Process of burning of worn tires - Google Patents

Abstract

FIELD: burning of worn-out tires and any other briquetted material in rotating furnaces designed to calcine loose materials. SUBSTANCE: invention can find use in cement-making and metallurgy. Process of burning of tires in rotating furnace includes their feed into furnace through branch pipe, into high-temperature zone on to layer of calcined material. Tires according to invention are fed so that they hit section of crossing of dynamic and static slopes of calcined material. EFFECT: improved conditions for burning tires and heat exchange with calcined material, prolonged service life of furnace lining. 2 dwg

Description

 The invention relates to methods for burning worn tires, as well as any kind of briquetted materials in rotary kilns for firing bulk materials and can be used in the cement and metallurgical industries.

 A known method of burning worn tires, which is described in the copyright certificate of CCCP 1440140. cl. F 27 B7 / 32 from 07.28.86.

 The method consists in the fact that worn tires are fed through the loading hopper of the fixed casing of the furnace into the nozzles, and then into the layers of high temperatures on the layers of material.

 The disadvantage of this method is that it does not ensure the safety of the lining when applying tires, t.k. the latter are fed into the furnace from its upper point, and in this case, the fall of the tire is accompanied by a shock that destroys the lining of the furnace.

 The closest in technical essence, is the method described in the patent of Ukraine 1318, z-ka 4517905/23. class F 27 B 7/32 of 10.20.87

 The specified method is. that worn tires are fed into the rotary kiln body through the nozzle into the high temperature zone on the layer of calcined material.

 In this case, tires are supplied to the furnace from the side of the material placement during rotation of the furnace.

 The disadvantage of this method is that this supply of tires does not guarantee the safety of the lining of the furnace, since the tire, leaving the nozzle at a speed, slides along the layer of material or even above it, beats into the lining that is not protected by the material, burning on it.

 The basis of the invention is the task of creating such a method that would ensure a guaranteed supply of worn tires directly to the maximum layer of calcined material in the furnace, thereby increasing the durability of the furnace lining and guaranteeing the best conditions for their combustion and heat exchange with the calcined material.

 The problem is achieved in that in the method of burning worn tire covers in a rotary kiln by feeding them into the furnace body through a nozzle into the high temperature zone to the layer of material being burned, the tire covers in the direction opposite to the rotation of the kiln, and so that they fall on the intersection dynamic and static slopes of the calcined material.

 The invention is illustrated in the drawing, where figure 1 - shows a rotary kiln in plan: in fit.2 - section aa in figure 1.

 The rotary kiln for producing cement clinker comprises a housing 1 with a nozzle 3 made of heat-resistant material inserted into its opening 2, which is made inclined to the side opposite to the direction of rotation of the kiln. In this case, the long side of the cross section of the nozzle is perpendicular to the axis of the furnace, and its outer part protrudes above the housing 1, flush with the false shell 4.

 The transverse dimensions of the pipe 3 and the hole 2 are regulated by the maximum possible dimensions of the worn tires 5, loaded into the furnace.

 A sealed stationary heat-insulated casing 6 is located concentrically to the furnace body 1 and covers the false shell 4 of the furnace with a gap. The feed device for loading worn tires 5 is made in the form of an inclined tray 7 with a discharge chamber 8, which is located above the intersection of the dynamic and static slopes of the calcined material in the furnace and with a gap relative to the false shell 4.

 For the supply of tires 5, a device is used, such as a conveyor drive 9 with a pusher and a sealing shutter.

 The method is as follows.

 Worn tires 4 delivered to the cement plant are sorted by size and stored.

 From a consumable warehouse, tires 5 are loaded into a storage container 9, where they are installed sequentially in a row vertically. From the conveyor drive 9, the tires 5 are alternately pushed onto the inclined tray 7, rolled into the unloading chamber 8, where they are installed, rolled on the surface of the false shell 4, in the "standby" mode until the nozzle opening 3 comes up. After that, each tire 5 from the unloading chamber 8 falls through the pipe 3 and falls on the maximum layer of fired material, i.e., on the site where the dynamic and static slopes of the material intersect. In this case, tires are fed in the opposite direction to the rotation of the furnace.

 An example of determining the place of fall of worn tires.

The following data were used for this:
- the inner diameter of the housing 1 of the furnace is 4.6 m;
- rotation speed - 1.4 rpm;
- productivity - 72 tons;
- material fineness - up to 40 mm;
- angle of static (natural) slope of the material - 24 degrees;
- the angle of dynamic rebound of the material during rotation of the furnace is 40 degrees.

 The length of the chords of the material is 3.0 m, and the intersection will be located at a distance of 1.5 m from the vertical axis of the housing 1 in cross section.

 The indicated place where the tire covers 5 falls into the furnace ensures protection of the furnace lining and is the most favorable place for their complete combustion, thereby increasing the durability of the furnace lining and guaranteeing the most favorable conditions for the burning of tire covers and heat exchange with the material to be fired.

Claims (1)

 A method of burning worn tires in a rotary kiln by feeding them into the furnace body through a nozzle into a high temperature zone to a layer of calcined material, characterized in that the tires are fed so that they fall on the intersection of the dynamic and static slopes of the calcined material.

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