SU1460566A1 - Heat-exchange arrangement of rotary furnace - Google Patents

Abstract

The invention relates to heat exchange devices of a rotary kiln and reduces heat losses and dust generation. The heat exchanger contains horseshoe-shaped heat exchangers with a diamond with a fMi interstitial cross section. The ratio of the major and minor axes of the diamond is in the range of 1.5-2.5. The fastening elements at the bases of the plates of the heat exchanger are made in the form of coaxial cylindrical bosses 2. The large axes of the cross section of both plates of the heat exchanger are located in two parallel planes in the direction of rotation of the furnace. The fastening element of the furnace body is a corner 3c cut on one of the shelves. The reduction in heat loss is achieved by the fact that each heat exchanger contacts with the furnace body not along planes, but along lines, as well as with the shape of heat exchangers and their location in the furnace. The reduction in plasma formation is achieved by the fact that the cross section of the heat exchanger and its location in the furnace do not perturb the layer of material, but create a certain resistance by moving the gas flow, and its velocity is extinguished. 2 3.p. f-ly, 5 ill. fyto te ooinenip C (L S ||

Description

The invention relates to heat exchangers for rotary kilns of cement production and can also be used in other industries.

The aim of the invention is to reduce dust generation and heat loss.

Figure 1 shows the heat exchanger, front view; figure 2 is the same, side view; on fig.Z - the same, top view; figure 4 is a fastener located on the base of one of the ends of the heat exchanger (the fastener on the other plate is similar to the specified one); FIG. 3 shows the construction of the element of a fixing device connected to the furnace body in the form of a corner with a cutout on one of the shelves.

The heat exchanger is made of a horseshoe shape and rhombic section. The ratio of the major axis of the diamond rhombus to small diabetes is in the range of 1.5: .2.5. Formed acute angle between

the furnace body serves as a corner 3, the internal width of the shelves of which is equal to the diameter of the bosses 2 d. In the middle

- one of the shelves is cut to the shape of an acute angle / rhombus. The magnitude of the cutout by a few degrees may be greater than the angle a (. This will reduce the thermal contact in the mount of the heat exchanger.

The assembly of the heat exchangers on the furnace body is carried out according to preliminary marking. Initially welded to the furnace body with an edge of the shelf, not

15 having a notch, corner 3. This edge of the shelf must coincide with the generator of the furnace body. Then, in the formed shed between the furnace body and the corner shelf 3 with a cutout, one of the

20 plates 1 of the heat exchanger with their fasteners — bosses 2. The position of the heat exchanger is aligned in the center plane of the furnace and is made by attaching a second angle

  V t-ClOwX dft-f AJlXl. -f × J. LJtf A je, - u. .. v..r-I -. - r-l - ----- i- --I I -.

the rhombus planes do not allow the latch 3 to the furnace body, to be preliminarily lived on them with the material to be calcined, combined with its cut with sharp

the angle of the diamond of the second plate 1 heat exchanger and its bosses 2.

This is due to the fact that the angle of repose of the material (ok-olo 42) is less than the angle between the minor axis of the rhombus diaphragm and its side surfaces.

The fastening elements at the bases of the plates 1 of the heat exchanger simultaneously serve as the supporting bases of the heat exchanger and are made in the form of a cylindrical rhombus of the second plate 1 of the heat exchanger and its bosses 2.

The ratio of the major and minor axes of the rhombus is in the range of 1.5-2.5 and the location of the heat exchanger along the diametrical plane of the furnace is chosen for the following reasons.

Dust-proof bobster 2 with a diameter of d has been completely eliminated; 35- one of the heat exchanger is placed

on the common axis SP. The total forming bosses 2 QH passes through the apex of the outer acute angle of the diamond "(perpendicular to its major axis AB. The longitudinal axis of the bosses SP is displaced from the top of the angle at along the major axis AB to the heat exchanger body by the radius of the bosses 2 d / 2. Large axes The AV cross sections of both ends of the heat exchanger are located in two parallel planes in the direction of rotation of the furnace. The bases of the heat exchanger plates are bounded by an inclined plane that extends tangentially to the surface of the little bobs 2, and the height of the formed bevel does not exceed ins furnace lining. exchangers are arranged in the furnace body in several rows circumference. Number of rows and heat exchangers in the circumference are determined for particular conditions (size of the furnace, fuel, feed, etc.). Thermal calculation. fastening elements arranged on

40

due to the exclusion of scattering from the heat exchanger of the baking clinker into the gas flow when turning the furnace, as the heat exchanger design does not have surfaces that would take part of the clinker and transport it to a certain height from the total flow.

The velocity of the gas stream 45 in the zone of the heat exchanging device is reduced by creating aerodynamic resistance to the gas stream by placing it on it. paths wide, heat exchanger planes.

When the ratio of the axes of the rhombus is less than 1.5 phi: the rhomb rhombus will approach the square, which will reduce the heat exchange surfaces and the aerodynamic resistance to the gas flow. It is possible to capture clinker by heat exchangers from the total flow, which will lead to dust formation. When the ratio of the axes of the diamond is more than 2.5 aerodynamic resistance to gas

50

55

the furnace body serves as a corner 3, the internal width of the shelves of which is equal to the diameter of the bosses 2 d. In the middle

one of the shelves is cut in the shape of an acute angle / rhombus. The magnitude of the cutout by several degrees may be greater than the angle a (. This will reduce the thermal contact in the mount of the heat exchanger.

The assembly of the heat exchangers on the furnace body is carried out according to preliminary marking. Initially welded to the furnace body with an edge of the shelf, not

5 having a notch, corner 3. This edge of the shelf must coincide with the generator of the furnace body. Then, in the formed shed between the furnace body and the corner shelf 3 with a cutout, one of the

0 plates 1 of the heat exchanger with its fasteners — bosses 2. The position of the heat exchanger is aligned in the center plane of the furnace and is made by attaching a second angle - -. - r-l - ----- i- --I I -.

25 ka 3 to the furnace body, previously combined with its sharp cut

ka 3 to the furnace body, previously combined with its sharp

the angle of the diamond of the second plate 1 of the heat exchanger and its bosses 2.

The ratio of the major and minor axes of the rhombus is in the range of 1.5-2.5 and the location of the heat exchanger along the diametrical plane of the furnace is chosen for the following reasons.

Dust formation ™ of heat exchanger device completely eliminated

due to the exclusion of scattering from the heat exchanger of the baking clinker into the gas flow when turning the furnace, since the heat exchanger design does not have surfaces that would take part of the clinker and transport it to a certain height from the total flow.

The velocity of the gas flow in the zone of the heat exchanging device is reduced by creating aerodynamic resistance to the gas flow by placing it on it. paths wide, heat exchanger planes.

When the ratio of the axes of the rhombus is less than 1.5 phi: the rhombus will approach the square, which will reduce the heat exchange surface and the aerodynamic resistance to the gas flow. It is possible to capture clinker by heat exchangers from the total flow, which will lead to dust formation. When the ratio of the axes of the rhombus is more than 2.5 aero. - dynamic resistance to gas

the flow will increase and the heat exchange between hot gases and heat exchangers will decrease. In addition, in this case, the heat exchanger body will be thin and its durability will be reduced.

Placing two heat exchanger plates 1 in different parallel planes I and II ensures the stability of the heat exchanger and, most importantly, intensifies the heat exchange between the clinker and the heat exchanger due to the fact that the planes of one heat exchanger in the clinker layer will move along different paths and act on the material not in contact with the adjacent plate I.

Smooth mating of plates I heat10

15

the use of linear contacts between the heat exchangers and the furnace body, and not along the planes, in the design of the fixing device. This dramatically reduced the heat loss to the surrounding C1) e, i.e. increased leakage efficiency.

Claims (3)

1. Heat exchanging device of a rotary kiln, containing a lining and circumferentially arranged rows of heat exchangers connected to the surface of the kiln body by means of fastening elements arranged on the bases of heat exchangers, made in the form of cylindrical bosses and fixed on the body The arc and the same cross-section of the furnace of the fastening elements, which ensure thermal reduction, are due to the fact that, for the purpose of stresses in the heat exchanger and reducing dust generation and heat losses, the heat exchangers are made of a horseshoe-shaped rhombic section 21) create the movement of clinker, which, due to the low thermal conductivity, greatly intensifies its heat exchange. Installing the proposed heat exchangers into the furnace, which are provided with curved surfaces formed by the smooth mating of the plates I by the arc B of the plane of the furnace body, and scrape them off the burning material towards its movement, creates resistance to its passage and increases the material level in the furnace in the zone of the heat exchanger. This creates favorable conditions for heat exchange between the clinker, the gas flow and the furnace lining by increasing the area of their contact and increases the heat treatment time of the material in the area of the heat exchanging device. The proposed construction of fasteners with a ratio of rhombic axes equal to (1.5: 2.5): while forming the bosses of the fastening elements pass through the top of the outer acute angle of the rhombus perpendicularly 30 of its major axis and the longitudinal axis of the lugs are shifted along this axis from the top of the outer acute angle of the rhombus into the heat exchanger body by the magnitude of their radius, and the fastening elements on the body 25 furnaces are made of commensurate with the diameter of the bosses of the corners with a cutout in the middle of one of the shelves in the form of an acute angle, connected to the furnace body by the edge of an adjacent shelf. 40 2. Device. According to Clause 1, about tl and - the fact that the large axes of the cross sections of the ends of each heat exchanger are offset from one another along parallel lines. heat exchanger device very .js planes in the direction of rotation simple, does not require significant labor costs in the manufacture and installation of heat exchangers. In the proposed heat exchange device and, in particular, fastening devices, the area of thermal contact between the heat exchangers and the furnace body is significantly reduced. ovens. 3. The device according to claim., Tl and g is the fact that the bases of the plates of heat exchangers are beveled along 50 inclined planes passing tangentially to the surface of the heat exchanger, and the height of the formed bevel does not exceed the thickness of the furnace lining. the use of linear contacts between the heat exchangers and the furnace body, and not along the planes, in the design of the fixing device. This dramatically reduced the heat loss to the surrounding C1) e, i.e. increased leakage efficiency. Invention Formula 1. Heat exchanging device of a rotary kiln, containing a lining and circumferentially arranged rows of heat exchangers connected to the surface of the kiln body by means of fastening elements arranged on the bases of heat exchangers, made in the form of cylindrical bosses and fixed on the body furnace fastening elements, about the t of which is the fact that, in order to reduce dust generation and heat loss, heat exchangers are made of a horseshoe-shaped rhombic section 21) nor with a ratio of rhombic axes equal to (1.5: 2.5): while forming the bosses of the fastening elements pass through the top of the outer acute angle of the rhombus perpendicularly 30 of its major axis and the longitudinal axis of the lugs are shifted along this axis from the top of the outer acute angle of the rhombus into the heat exchanger body by the magnitude of their radius, and the fastening elements on the body 25 furnaces are made of commensurate with the diameter of the bosses of the corners with a cutout in the middle of one of the shelves in the form of an acute angle, connected to the furnace body by the edge of an adjacent shelf. 40 2. Device. According to Clause 1, about tl and - the fact that the large axes of the cross sections of the ends of each heat exchanger are offset from one another along parallel lines. .js planes in the direction of rotation ovens. 3. The device according to claim., Tl and g is the fact that the bases of the plates of heat exchangers are beveled along 50 inclined planes passing tangentially to the surface of the heat exchanger, and the height of the formed bevel does not exceed the thickness of the furnace lining. RL to R L.Gratillo 5 Sostash1tel M.Petrova Tehred L..Serdyukova Order 531/48 Circulation 533 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 fffjdKoembl Fib, 3 Proofreader E. Lonchakova Subscription