SU1020736A1 - Rotary furnace - Google Patents

Description

2. Furnace according to claim 1, characterized in that, in order to reduce the consumption of the dusting device, the pipes are curved at an angle U-B

.and fitted with valves.

3. Furnace according to Claim 1, about the aphids, so that the nozzles are inclined at an angle of 2-12 to the inner surface of the lining.

C, Furnace according to claims 1 and 2, about tl and - with the fact that the ladles are tilted at an angle

5-30 to the axis of the pipe bottoms and installed through at least one pipe

5.Pech according to claim 1, about the fact that it is equipped with a shell located from the furnace body at a distance equal to 0.03-0.1 of the diameter of the furnace, while the casing is set to - this shell.

6.Pech in accordance with clauses 1 and 1, so that it is equipped with retaining rings with slots made with, equal to 0.04-0.1 of the furnace diameter, the depth of the slots is 0.8-0.9 ring heights.

The invention relates to the industry of building materials to rotary kilns with adjustable thermal processes in the burning zone during the production of expanded clay, cement and other building materials by introducing a gaseous medium into the burning zone, creating the required gaseous raw material for the clay raw material both in composition and and by temperature, as well as by introducing a powder firing zone. It is known a device for periodic injection of cold wind before the zone of maximum temperature S13. The disadvantage of this device is that it does not o6ecne4Maae with uniform cooling of the lining and material, which also leads to overheating of the lining, to a forced decrease in the heat resistance of the firing, as well as to premature destruction of the lining and exit furnace of stro. It is also known a device, which comprises a housing with openings, a housing around the furnace, and a charging tube for the furnace. The disadvantage of this device is a greater consumption of dusting agent, unevenness of dusting, low quality products. The closest in technical essence to the proposed device is a device for loading material into a cylindrical container that contains a rotating finger (the body of which is made with nozzles, tubes with scoops installed in the nozzles, a grooved cover, on the side walls of which elastic cylinders of elastic material are mounted and sealing Rings z}. The disadvantages of this device are the impossibility of controlling the firing process in the firing zone, the impossibility of introducing a gaseous medium with a temperature of up to 300, as this leads to overheating the furnace body under the casing, to its deformation, cracking and emergency shutdown of the furnace from operation, inoperability of seals working in contact with the furnace body heated to 200 OSSEP G and conditions of high dustiness, as well as high consumption of powdered powder due to the removal it through the gaps, due to the late precipitating of the dusting agent (on the layer of the calcined material) which leads to its discharge with the escaping gases. The later precipitation of powder from the pipes is explained by the high angles of felting (friction) of the tyroshk about pipes that are dead one AO 50-70, as well as the expenditure of additional time for moving it through pipes, while the angle of elevation of the calcined material / 1a is in the range of 45-65. The disadvantages are the burning: and the deformation of the pipes from heating them with hot gases and the material to be calcined, cutting and destruction by moving lining. The installation of retaining rings in the furnace body, which exclude the effect of lining on pipes at different heating temperatures of the ring, leads to thermal stresses in the ring, deformation of the furnace body, its flaring, ringing of the jets to destruction of the lining. Despite the increase in productivity, the decrease in the bulk density of expanded clay gravel from the introduction of gas-medium and dust into the kiln due to the disadvantages indicated above, these devices have not found application in the construction materials industry in the production of expanded clay gravel. The purpose of the invention is to regulate the process in the burning zone, reduce fuel consumption, simplify the design and increase reliability. This goal is achieved by the fact that in a rotary kiln, predominantly expanded clay gravel, comprising a body with nozzles, tubes with scoops located in the nozzles and a casing installed around the body, the side walls of the casing are made in the form of ducts with inclined angles of 30-70 ° to the casing is peaked, and the pipes are inclined at an angle of k-lB to the vertical. In addition, it is advisable for the purpose of reducing the flow rate of the dusting tube to be curved at an angle of 1060 and to provide them with valves. It is also permissible to make the nozzles inclined at an angle of 2-12 to the inner surface of the lining. The scoops are made with bottoms tilted at an angle of 5-30 to the axis of the pipes and installed through at least one pipe. . A rotary kiln with a shell, located from the furnace body for a distance equal to 0.03-0.1 diameter of the furnace, while the casing is mounted on the shell. The furnace is equipped with retaining rings with slots made in increments equal to 0.04-0.1 of the diameter of the furnace, and the depth of the slots should be 0.8-0.9 ring heights. The implementation of a rotary kiln with a housing, the side walls of which are made in the form of ducts with slit-like openings directed at an angle of 30-70 to the furnace body, ensures regulation of the thermal process in the burning zone, reliable sealing of the gap between the furnace body and the furnace, it will eliminate knocking out of dust and gas-environment, as well as provide cooling of the furnace body under the casing and, accordingly, increase its reliability and operability. The execution angle of the slots -. more than 70 holes to the furnace body leads to a deterioration of the cooling effect of the furnace body, causing large inflow of air from the environment, which will make it difficult to regulate the firing process. A tilt angle of less than 30 causes severe turbulence in the gap, leading to a sharp increase in hydraulic resistances, to a drop in pressure under the casing and in the pipes, which also leads to a deterioration of the regulating effect in the burning zone. Installing the pipes bent at an angle to the vertical, bent at an angle of 10-60 °, will create a rotating flow inside the furnace, moving in the direction of movement of the burning material, which will ensure equalization of the temperatures of the burning material, the lining of the furnace and the heat transfer gas between each other, which will allow the burning process to temperam close to optimal, and pipes bent at an angle of 10-60 introduction of dusting material under the layer of calcined raw materials. This will provide improved quality products for claydite in bulk density and uniformity of physical and mechanical properties, reduce fuel consumption, increase productivity. k creates Making the angle less in the burning zone a short section with a controlled heat process but does not provide the required temperature equalization along the required length of the burning zone. Making the angle more leads to uneven (stripes) temperature distribution in the burning zone (gas, calcined raw materials and furnace lining), which leads to uneven burning process, deterioration of control limits, deterioration of product quality and uniformity of physical and mechanical properties, increase in consumption. fuel. Making the angle of inclination of the pipes less than 10 will not ensure a steady precipitation of the powder under the layer of the material being calcined, which leads to its entrainment with waste gases. Making the bend angle of pipes more than 60 makes it difficult to install them, does not exclude the dusting of the powder before the layer of calcined material approaches the hole in the nozzle pipe and closes it completely. It also leads to the blowing of the dust bottle and to its consumption. Installing scoops with valves on the pipes will ensure the capture of a sufficient number of dust collectors. Hold it when lifting, B | pouring into the pipe at the prescribed time with a guarantee that it will be placed under the layer of calcined material. Making holes between the valve and the pipe will ensure the supply of the gas medium to the bed with the valves closed, thereby eliminating the injection of powder to the prescribed time. Installation of nozzles inclined at an angle from the foot to the pipes will ensure uniform mixing of the injected gas-medium with hot gases, leveling, temperature between the gases (heat carrier) material and lining. Install nozzles at an angle less. 2 aggravates mixing. Gas, supercool material and lining at the exit point. Installing nozzles at an angle of more than 12 leads to the separation of the swirling gas flow from the lining, the calcined material, which makes the process poorly adjustable. . The presence of scoops containing inclined bottoms at an angle of the discharge line to the pipe axis, installed 1x alternately through one, two or three pipes, will ensure a fairly uniform dusting-distribution of the powder under the baking material, which increases the uniformity of the physicomechanical properties of the finished product. Installing an additional shell With a gap of 0, 1, the diameter of the furnace will provide normal cooling of the furnace body and the flow of gas-medium with a temperature up to ZRO C. Installation of retaining rings with slots. 0,8-0,9 heights of rings with step О,, 1. furnace diameter, eliminates or reduces to minimum temperature stresses in the rings and furnace shell

 Fig. 1 depicts a rotary kiln, general view; figure 2 is a section along aa in figure 1; on fig.Z-- scoop;

the material to be supplied while ensuring that the gas medium is continuously supplied to the furnace. 36, 6 on figl - cut oven for pokhozhuhu; in FIG. 5 a section BB in FIG. figure 6 is a section along the ring; Fig.7 section bb In Fig.6. rotary kiln 1 comprises a housing, a grooved housing 2 with side walls in the form of ducts 3 on the inner surface of which slit-like holes 4 are made. They are inclined at an angle A to 30–70 to the furnace body towards the middle of the case 2. On the furnace body 1 are inclined at an angle rc-tb to the vertical pipe 5 | Curved at an angle C YugbO. The pipes 5 are equipped with scoops 6, the bottom of which is inclined at an angle сГ 5ГЗ. The scoops are equipped with valves 7 with a counterweight 8. Between the valves 7 and the pipes 5 there are holes 9. The scoops 6 are installed through one, two or three pipes uniformly. At. Working without the use of dust on the pipes does not have scoops with valves. At the outlet ends of the pipes 5, if necessary, nozzles 10 can be installed, the outlets of which are inclined at an angle P 2r12 ° to the lining 13 of the furnace 1, have the form of longitudinal slits forming the cylinder of the furnace body. Figures 5 and k depict an embodiment of a rotary kiln that contains a D0field | -1 body. Obuchak 11, mounted on brackets 12 and pipes 5 on the hull of part 1 of the shell 1. Between the shell 11 and the kiln case 1, there is a gap of 0.03fO, 1 of the kiln diameter 1. Retaining rings I mounted on the inner surface of the kiln 1 case, backed up with kerchiefs 15- On the rings C of the c., There are slots 16, the depth of which is equal to 0.8-0.9 of the ring height. . Rotating with. the oven works as follows. During the rotation of the furnace 1, the scoops 6 capture the dusting agent lying in the groove of the casing 2, while the valve 7 closes the outlet 9 of the scoop 6, excluding the dusting of the dusting device. The gas through the opening 9 through the pipe 5 enters the furnace, which prevents premature (slow dumping and blowing the powder into the furnace and carrying it out with hot gases until the pipes 5 are filled or the nozzles 10 are burned). As the furnace rotates further, the valve 7 opens, for example with a counterweight 8 , dusting material (powder or granules) is poured along the bent pipe 5 into the Furnace under the layer of burning material. The bend of the pipe 5 at an angle of 7 ° 10760 contributes to the earlier dusting material in the furnace when the furnace is rotated compared to known devices E. -this This also contributes to the slope of the bottoms of the buckets 6 at an angle of 30 ° ...

The sealing of the gap between the furnace and the casing 2 is provided by supplying the gas-medium from the ducts 3 through the slit-like openings inclined at an angle oL 30f70 ° 4. to the furnace body 1.

The gas stream flowing out of the holes creates a velocity head in the annular gap between the furnace 1 and the casing 2, which compresses the gap, eliminating the release of gas and dust into the atmosphere, cools the furnace casing 1 of the pipe, 5 and, coming from the casing 2 through the pipes 5 into the burning zone, creates a rotating flow at an angle of 4: 16, which moves along the kiln towards the discharge of material. When this occurs, the equalization of temperatures between the gas-medium, the gas-coolant, the lining of the furnace and the calcined material. Such a joint movement of the gas-medium, material isf. 2

includes overheating of the burning material, sticking it, which will allow the burning process to be carried out at higher temperatures close to the optimum, with lower values of the excess air ratio, with a minimum consumption of fuel and dusting material,

Regulation of the firing process is carried out by controlling the amount and temperature of the introduced gas-medium, by changing the fuel consumption. .

The movement of the gas medium in the gap between the furnace body 1 and the ducts 3 of the casing 2 cools the furnace body, pipes 5 and nozzles 10, eliminates their overheating, warheading and burning, which is the case in known devices. The installation of retaining rings with kerchiefs 15, slots 16 excludes the occurrence of high temperature stresses, warping and deformations in the rings 1, in the body of the furnace 1.

The use of the proposed device in the production of expanded clay gravel will provide an increase, its quality in terms of bulk density is not. less than one brand, will increase the homogeneity of the physico-mechanical, properties in the same range of the brand, the performance of the furnace and reduce fuel consumption.

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Claims (6)

1. ROTARY FURNACE for roasting mainly expanded clay gravel, comprising a body with nozzles located in nozzles of a pipe with scoops and a casing installed around the body, characterized in that, in order to regulate the process in the firing zone, reduce fuel consumption, simplify design and increase reliability, the side walls of the casing are made in the form of boxes with slit-like openings inclined at an angle of 30.-70 ° to the furnace body, and the pipes are inclined at an angle of 4-16 ° to the vertical. > 2. The furnace according to claim 1, distinguishing itself from me. the fact that, in order to reduce the flow rate of the dusting machine, the pipes are made curved at an angle of 10-6 (/ ^3. and equipped with valves. 3. The furnace according to claim 1, characterized in that the nozzles are inclined at an angle of 2-12 ^th to the inner surface of the lining. 4. The furnace according to claims 1 and 2, about l and - \ characterized in that the scoops ’are made with tilted at an angle 5 ^_ 30 ° to the pipe axis with bottoms and installed through at least one pipe, 5. The furnace according to π.1, which is characterized in that it is equipped with a shell located from a furnace body at a distance equal to 0.03-0.1 times the diameter of the furnace, while the casing is mounted on this shell. 6. The furnace according to claim 1, with the fact that it is equipped with retaining rings with slots made with uiatoM equal to 0.04-0.1 of the diameter of the furnace, while the depth of the slots is 0 , 8-0.9 ring heights.