SU750234A1 - Heat-exchanging and dust-trapping apparatus for rotary furnace - Google Patents

Description

(54) HEAT EXCHANGING AND DUSTING DEVICE OF ROTATING FURNACE

one

This invention relates to a technique for the intraburner heat exchanging-dust-separating devices of a rotary kiln, such as firing cement clinker.

The chain-dust-collecting devices of a rotary kiln are known, consisting of rows of sagging chains attached at one or two points on the inner side of the furnace body 1.

A disadvantage of the known device is that it does not completely cover the gas passage cross section of the furnace, while the sagging chains leave a free space of 0.35-0.5 in diameter of the furnace. The open chain formed in the chain curtain creates the conditions for the perpetual gases to pass unhindered through it. The part of furnace gases that passes through the circuit-free channel is not dedusted and does not transfer heat to the chains, which in turn reduces the efficiency of the chain curtain.

The closest in technical essence and the achieved result to the described invention is a heat-exchange-dust removal device of a rotary kiln containing attached to

The inner surface of the furnace body is a row of chains and blades that are mounted between them, each of which is made in the form of blades attached to the central disk, and the blades depending on the length of the furnace may have a different opening angle, for example, increasing in the direction of gas movement.

The disadvantage of the known device is that the swirlers along the length of the furnace establish equal dimensions and design, and therefore the first, along the direction of the gases, the blade swirl precipitates the bulk of the dust, dust precipitation occurs on a short section of the furnace. Concentrated dust precipitation accumulates a large amount of dust in the short portion of the wet lining, as a result of which the rheological properties of the sludge sharply change, which causes the formation of sludge rings, which disrupt the process conditions in the furnace. .

The purpose of the invention is to provide an even 20 cm dust precipitation along the length of the furnace, preventing the formation of sludge rings.

This goal is achieved by the fact that in a temper-exchange-dust removal unit of a rotary kiln containing attachments to the inner surface of the body of the furnace there are rows of chains and bladed swirlers installed between them. each of which is made in the form of a fastener; the first to the central disk of the blades; In this case, the angle of the blades of the swirl is 5-80 °. The degree of overlap of the furnace gas passage with a swirler is 0.2-1.0, while in the direction of gas movements along the furnace the swirlers are made with an increasing degree of overlapping of the furnace gas passage. The distance between adjacent swirlers is 2.0-6.0 furnace diameters. In addition, the blade swirl is installed with an eccentricity relative to the axis of the furnace, equal to 0.1-0.3 gas passage diadetra furnace. The device can be equipped with chains, which are inserted parallel to the blade of the swirler and tf-attached at one end to the central disk, and opposite to the furnace body. In addition, the device can be equipped with beads of chains attached to the furnace body in the installation areas of the vane swirlers.

FIG. Figure 1 shows the heat transfer, dust-collecting unit of the rotary kiln; in fig. 2 is a section A-A in FIG. 1 (paddle loader installed in the center of the furnace); in fig. 3 a section on the Fig. 1 (the paddle swirl is installed with an eccentricity about the axis of the furnace), in FIG. 4 shows a section B-B in FIG. 2

The device consists of a paddle swirl 1 and chains 2 of a chain curtain, which are attached to the body of the rotary kiln 3, the paddle swirl 1 is set up and the chains 2 are weighed in the device in the following order. In the direction of gas movement, the first vane swirler 1 is installed, followed by tsegn 2. In the sequence indicated, the paired installation of the vane swirler 1 and the load sections of chains 2 are repeated along the length of the device.

Bladed swirler 1 consists of immobilizing blades 4, which are radially fastened to one end of the central cone-shaped disk 5, the other end to the bracket 6. There is a swiveling blade 4 with chains 7 on its frontal side, which are attached at one end to a cone-shaped disc 5, and at the other end - to the furnace body 3. The furnace is internally lined with 8.

In the direction of movement of the gases, following the vane swirler. H 1, circuits 2 are visited, which heat up in the gas flow and heat the calcining material 9. The proposed device uses known chain linkages, such as freestanding, overlapping and spiral-shaped sockets, peripheral chain mats and other types of chain linkages. In the area of the furnace 3, which is occupied by a paddle swirl 1, between the rows of this hinge 2, additional chains 10 are visited, which are sagging between the lining 8 and the swirl blades 4.

The gases passing through the cross section of the furnace 3 along the chain curtain, through the paddle swirler 1, change the direction of movement. Depending on the angle of opening of the 4-o vortex blades (the gas flow receives rotational motion around the axis of the vane swirler i. Gas turbulence is suited. It is the passage of the gas flow through the uncovered chain 2 channel, and ensure a flue-free passage of gases across the entire furnace curtain 3 section 3 The rotational movement of gases around the axis of the swirler 1 creates a centrifugal force, under the action of which the dust-like material in the gas flow moves away from the axis of the swirler 1 and, upon reaching the surface of the lining 8, loses corrosion and is deposited in the furnace 3. Assuming that the dust-like particles are deposited only when reaching the surface of the lining 8 of the furnace 3, the opening angle of the vortex blades 4 is 5-80 ° and is chosen on the basis that the trajectory of the dust-like particles of the vortexed dust-gas flow ended reaching the lining 8 of the furnace 3 during the flight to the subsequent swirler 1 or the end of the chain curtain zone of the furnace 3. At the same time, for the angle of the blades, the distance between adjacent swirlers 1 (respectively, the length of the trajectory) is 6.0 diameter In the furnace 3, at an opening angle of 80 °, the distance between adjacent swirlers 1 is 2.0 times the diameter of the furnace 3, while the difference in magnitude of the opening angle of the blades 4 is 5-45 °.

The diameter of the blades 4 of the swirler is from 0.4 to 0.9 of the gas passage diameter of the furnace 3, while the swirlers 1 in the direction of gas flow along the furnace 3 are installed with the increasing diameter of the blades 4 and the difference in the diameter of the blades of the 4r swirlers located 1 is 0.1-0.4 for the gas passage diameter of the furnace 3.

Claims (7)

The vortex of the gas flow increases the gas velocity, as a result of which the heat transfer to chains of m 3 is more intensive and the material 9 is burned. To ensure maximum dust precipitation and intensive heat exchange, increase the degree of overlap of the furnace section 3 to the maximum (equal to 1.0) 4 swirl 1, leaving, at the same time, a constant gas passage between the blades 4 swirl, Changing the degree of overlap of the gas passage section of the furnace 3 is achieved by varying the number of blades 4 and changing their width. However, in some factories the chain curtain is smeared, the chains are heavily coated with sludge and this increases the hydraulic resistance of the chain curtain. In this case, in order to reduce the hydraulic resistance created by the paddle swirler 1, the degree of overlap of the furnace 3 is reduced by 3 blades 4 of the swirler 1, which in this case is at least 0, 2. The installation of the blade swirl i coaxially with the furnace 3 provides for the turbulence of gases around the axis of the furnace 3. For additional turbulence with forcing the gases to deviate from the axis of the furnace 3, the blade swirler is installed with eccentricity. In this case, the maximum amount of gases deviating from the axis of the furnace 3 is achieved when a paddle swirler 1 is installed with an eccentricity from the axis of the furnace 3 at 0, i-0.3. furnace diameter values 3. Separately arranged along the length of the device, the swirlers 1 are distinguished by the difference in the eccentricity values of the installation of the swirlers 1 by 0.1-0.2 of the gas passage diameter of the furnace 3. The bladed swirler i next in the direction of gas movement is rotated around the furnace axis 3 by 90-180 ° , compared with the previous swirl m. 1, while the devices along the length of the device located swirlers i differ in the difference in the angle of rotation around the axis of the furnace 3 by 30-120 °. Due to the fact that a wet glatile passes through the chain curtain, on the surface of the blades 4 of the swirler 1, growths are formed from the calcined raw material 9. To clean the surface of the blades 4 of the bladed swirl 1 next to the blade 4, chains 7 are hung. 7 slips along the frontal surface of the blade 4 and thus cleans it from the growths. Cleaning the surface of the turbulent blades 4 improves the turbulence of the gas flow, reduces local resistance to the passage of gases. At the installation site of the vane swirler 1, the most intense heat exchange is ensured by the swirling flow of gases and, therefore, the build-up of raw materials is formed in this area of the lining 8 of the furnace 3. To prevent buildup on the lining 8 of the furnace 3, additional chains 9 are attached, which are fastened in opposite rows with chains 2 to the furnace body 3 with opposite ends. The proposed device is installed in the cold end of furnace 3 at a distance of 2.0-4, 0 diameter from the edge of the furnace 3. The length of the device is determined by the weight of the chains of chains 2, the number of vane swirlers 1 and their characteristics. The design features of the 3 blade-mounted swirlers 1 installed along the length of the furnace are determined by one or several design differences of the swirler 1 itself, as well as by its installation: in the gas passage section of the furnace 3. For example, in the direction of gases the follower swirler I installed differs from previous swirler 1 diameter, angle of the blades 4, eccentric installation and rotation of the furnace around the axis of the furnace 3, also another section of signs differences in groups of two, three, four, five, and-is and in each group, at that, each group of differences may be peculiar to the paddle vortex offered to the device, which is available to the proposed device.; In all cases, an installation; 5 blades; 1 swirlers 1 with various structural components of a dusty dressing along the furnace ;; 3 in the amount of precipitated dust, which provides a change in the rheological properties of sludge without ring formation. TaKsiM obozog -,;, changing the KOKCTDVKTHBH.UX characteristics of the vane swirlers along the length of the device, which can be installed on the device, will be obtained along the length of the leak 3 at the max. Pressure condition of the flap:; Tens; from the furnace 3. Pre.; m; . the proposed device; precipitation along the length of the device, and 1nteis ;; heat transfer between furnaces; v; K gas; pi and chains, which lowers the temperature of the exhaust gases, reduces heat demand for baking clinker, and eliminates ring formation in the furnace 3. Claims of the invention. A heat-exchanging dust-collecting device for a rotary kiln contains a series of polypeas attached to the inner surface of the kiln body and the insert between them is a blade vortex. each of which is made in the form of blades attached to the central disk, enclosing the fact that, with the aim of providing a varied dust precipitation. along the length of the furnace, the diameter of the swirl area of the swirl is 0.4-0.9 g of the bore diameter of the furnace while, in the direction of gas flow along the furnace, the swirlers perform C1 | with an increasing blade diameter. 2.ycTpofiCTBO 110 p. 1, indicated by the fact that the angle of the spread of the logs of the swirler is 5-80. 3. The device according to p. I and 2. characterized in that the degree of overlap of the swirler. M of the gas passage section of the furnace sags 0.2 to 1.0. At the same time, as the gases are lowered along the furnace, the swirlers are made with an increasing degree of overlapping by them of the gas passage pkci section. 4. A device according to claim 1-3, characterized in that the distance between adjacent swirlers is 2.0-6.0 times the diameter of the furnace. 5. The device according to claim 1-4, characterized in that the paddle swirler is installed with an eccentricity with respect to the furnace axis equal to 0.1-0.3 of the gas passage diameter of the furnace. 6. The device according to paragraphs. 1-5, characterized in that it is provided with chains which are hung parallel to the blades of the swirler and are attached at one end to the central disk and opposite to the furnace body. 7. The device according to PP. 1-6, characterized in that it is provided with arms of chains, attached to the furnace body in the installation areas of the vane swirlers. Sources of information taken into account in the examination 1. Handbook for the production of cement Research Institute of Cement. M., 1963, p. 364-369. 2. USSR author's certificate for application number 2473602 / 29-33, cl. F 27 B 7/18, 1977. eight five FIG. five Qet Chech Proposal. fig TS