Longitudinal flame roller kiln

Abstract

The utility model relates to a longitudinal flame roller kiln, which comprises a kiln and a plurality of burner components, each burner component comprises a linear pipe part and a turning nozzle part which are of an integral structure, and the linear pipe part extends into the kiln and is fixedly arranged on the kiln wall of the kiln; the direction of a nozzle opening of the turning nozzle part is the same as the length direction of the kiln, and the turning nozzle part is characterized in that the nozzle opening of the turning nozzle part is flush with the pipe outer wall of the straight pipe part; in this way, the occupied space of the burner assembly in the kiln can be greatly reduced, multiple burner assemblies can be installed in the kiln so that it can be guaranteed that the high firing temperature can be achieved in the kiln, and meanwhile the manufacturing cost of the burner assembly can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ceramic firing, in particular to a flame roller hearth kiln. Background Art

[0002] As Figure 1 shown, in the existing ceramic roller hearth kiln, a number of groups of burners arranged in a crisscross and staggered manner are respectively installed on the kiln walls on both sides of the kiln. These burners spray flames into the furnace in a direction perpendicular to the kiln wall, and the generated high-temperature flue gas is discharged out of the furnace along the longitudinal direction of the kiln. The spraying direction of the flame in the furnace is basically perpendicular to the discharging direction of the flue gas. There are the following technical problems in use: First, when the high-temperature flame is sprayed, it directly faces the opposite kiln wall, resulting in too high a temperature of the opposite kiln wall, and a large amount of heat is transferred from the kiln wall to the outside, so that the heat dissipation of the entire kiln to the outside is large, and thus the thermal efficiency of the kiln is low. Second, since the burner flame sprays from the kiln wall to the center of the kiln, there are large temperature differences in the left, middle, and right kiln positions in the width direction of the kiln, making the physical and chemical performance indexes of the ceramic products fired in the same row inconsistent, greatly affecting the quality of the ceramic products.

[0003] In the technical solution disclosed in the Chinese utility model patent with the application number 201320824176.X and the name of "a double-beam lime kiln", the pipeline burner is designed as a 90-degree bent tube to solve the problems of the refractory lining on the kiln wall being burned out and the temperature in the kiln being uneven. However, if this kind of burner is used in a ceramic roller hearth kiln, there are still the following technical problems:

[0004] First, the burner itself occupies a large space in the length direction of the kiln. Coupled with the spraying length of the flame, the number of burners installed on the kiln per unit length is small, so that the temperature in the kiln is low and high-temperature resistant high-quality ceramic products cannot be fired. If high-quality ceramic products want to be fired, the length of the kiln must be increased, which will inevitably greatly increase the production cost of the enterprise.

[0005] Second, the firing of ceramic products is carried out under high-temperature conditions. The firing temperature of high-quality ceramics is even above 1200 °C. Therefore, the burner must be made of expensive high-temperature resistant materials. The burner is composed of a straight pipe part extending into the kiln and a bent pipe part bent 90 degrees from the straight pipe part. In this way, the overall length of the burner is large, and more high-temperature resistant materials are required, so its cost is very expensive.

[0006] Therefore, based on the various deficiencies still existing in the existing technical solutions, in order to better optimize the structural solution of the longitudinal flame roller hearth kiln and make it better meet the application requirements of the ceramic industry, it is very necessary to improve the current technical solution. Content of the Utility Model

[0007] The purpose of the present utility model is to solve the above problems and deficiencies, and to provide a longitudinal flame roller hearth kiln. By arranging the nozzle orifice of the turning nozzle part of the burner assembly flush with the outer wall of the straight pipe part, the occupied space of the burner assembly in the kiln is greatly reduced, so that more burner assemblies can be installed in the kiln to ensure a higher firing temperature in the kiln. At the same time, the manufacturing cost of the burner assembly can also be reduced.

[0008] The technical solution of the present utility model is realized as follows: A longitudinal flame roller hearth kiln includes a kiln and a plurality of burner assemblies. The burner assembly includes an integral straight pipe part and a turning nozzle part. The straight pipe part extends into the interior of the kiln and is fixedly installed on the kiln wall of the kiln, and the direction of the nozzle orifice of the turning nozzle part is in the same direction as the length direction of the kiln. Its characteristic lies in that: The nozzle orifice of the turning nozzle part is arranged flush with the outer wall of the straight pipe part.

[0009] Furthermore, it also includes a silicon carbide sleeve, and both the straight pipe part and the turning nozzle part are sleeved with silicon carbide sleeves.

[0010] Furthermore, the turning nozzle part is composed of a conical transition part and an arc-shaped bending part. The large end of the conical transition part is connected to the straight pipe part, and the small end of the conical transition part is connected to the arc-shaped bending part, and the end of the arc-shaped bending part is arranged flush with the small end of the conical transition part, so that the whole burner assembly is in a straight pipe shape.

[0011] Even further, the straight pipe part penetrates into the kiln perpendicularly to the kiln wall of the kiln, and the direction of the nozzle orifice of the turning nozzle part is perpendicular to the length direction of the straight pipe part.

[0012] Even more further, each of the burner assemblies is uniformly arranged and installed on the kiln wall of the kiln, and the lengths of the straight pipe parts of each burner assembly in the kiln are set to be the same or different.

[0013] The beneficial effects of the present utility model:

[0014] First, the nozzle orifice of the turning nozzle part of the burner assembly is arranged flush with the outer wall of the straight pipe part, so that the whole burner assembly is in a straight pipe shape, and the burner assembly does not occupy extra space in the length direction of the kiln. In this way, more burner assemblies can be installed on the kiln wall per unit length, so that the temperature in the kiln can be higher, which is suitable for firing high-quality high-temperature resistant ceramic products; and it can reduce the length of the kiln, improve the space utilization rate of the kiln, and thus greatly reduce the production cost of the enterprise.

[0015] Second, since the nozzle opening of the turning nozzle part is flush with the outer wall of the straight pipe part, the elbow part can be omitted, thereby reducing the overall length of the burner assembly. Less high-temperature resistant materials can be used to manufacture the burner assembly, reducing the manufacturing cost of the burner assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. 6 is a schematic diagram of the internal structure and usage state of an existing roller hearth kiln.

[0017] Figure 2 FIG. 7 is a schematic layout diagram of the burner assembly in the cross-section of the kiln furnace of the present invention.

[0018] Figure 3 FIG. 8 is a schematic layout diagram of the burner assembly in the internal side view direction of the kiln furnace of the present invention.

[0019] Figure 4 FIG. 9 is a schematic layout diagram of the burner assembly in the internal top view direction of the kiln furnace of the present invention.

[0020] Figure 5 FIG. 10 is a schematic structural diagram of the burner assembly of the present invention.

[0021] Figure 6 FIG. 11 is a schematic diagram of the usage state inside the kiln furnace of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0023] As Figures 2 to 6As shown in the figure, the present utility model provides a longitudinal flame roller hearth kiln, which includes a kiln furnace 1 and a plurality of burner assemblies 2. The burner assembly 2 includes a straight pipe portion 21 and a turning nozzle portion 22 with an integral structure. The straight pipe portion 21 extends into the interior of the kiln furnace 1 and is fixedly installed on the kiln wall of the kiln furnace 1, and the nozzle port direction of the turning nozzle portion 22 is in the same direction as the length direction of the kiln furnace 1. In order to achieve the purpose proposed by the present utility model: the nozzle port of the turning nozzle portion 22 is flush with the outer wall of the pipe of the straight pipe portion 21. In this way, the high-temperature flue gas generated by the flame no longer directly jets onto the opposite kiln wall, thereby avoiding excessive temperature on both sides of the kiln wall, which is beneficial to reducing the heat transfer from the kiln wall to the outside world, and thus reducing the heat loss of the kiln furnace; and the high-temperature flue gas generated by the flame is in the same direction as the discharge direction of the flue gas, which can greatly reduce the disorder state of the high-temperature gas in the kiln furnace, making the gas in many areas of the kiln furnace in a laminar flow state. In this way, the laminar boundary layer can effectively reduce the heat transfer coefficient of the high-temperature flue gas, contributing to further reducing the heat loss of the kiln furnace and further improving the thermal efficiency of the kiln furnace; in addition, due to the relatively stable flow of the flue gas in the kiln furnace, the smoke exhaust resistance of the kiln furnace is small and the firing positive pressure is also small, so that the energy consumption of the kiln furnace operation is also low; when in use, a plurality of burner assemblies can be arranged transversely on the top wall and the bottom wall of the kiln furnace, so that the transverse temperature distribution in the kiln furnace is not restricted by the burner range. At the same time, many uniform high-temperature flue gas channels can be subdivided on the cross-section of the kiln furnace, making the temperature distribution on the cross-section of the kiln furnace very uniform. The physical and chemical performance indexes of the ceramic products fired in the same row are consistent, greatly improving the quality of the ceramic products. At the same time, the problem that the width of the traditional roller hearth kiln is restricted by the burner range can be solved, thereby increasing the width of the roller hearth kiln, and then greatly improving the firing capacity of a single kiln furnace; the burner assembly of the present utility model does not occupy extra space in the length direction of the kiln furnace, so that more burner assemblies can be installed on the limited kiln wall to ensure the furnace temperature of the kiln furnace, thereby preparing high-quality high-temperature resistant ceramic products; and the burner assembly has a simple structure, uses less materials, and can also greatly reduce the manufacturing cost of the burner assembly.

[0024] As Figure 5 shown, it further includes a silicon carbide sleeve 3, and both the straight pipe portion 21 and the turning nozzle portion 22 are sleeved with the silicon carbide sleeve 3. Since silicon carbide has properties such as high strength and high temperature resistance, it can play a good protective role for the straight pipe portion 21 and the turning nozzle portion 22, enabling them to be used in a high-temperature environment for a long time without deformation and improving their service life.

[0025] As Figure 5As shown, the turning nozzle part 22 is composed of a conical transition part 221 and an arc-shaped bending part 222. The large end of the conical transition part 221 is connected to the straight pipe part 21, and the small end of the conical transition part 221 is connected to the arc-shaped bending part 222, and the end of the arc-shaped bending part 222 is flush with the small end of the conical transition part 221, so that the burner assembly 2 as a whole is in a straight pipe shape. Since the length of the turning nozzle part 22 is reduced, on the one hand, on the premise of ensuring that the nozzle opening is consistent with the length direction of the kiln 1, the material consumption of the burner assembly 2 can be reduced, thus greatly reducing its production cost; on the other hand, the diameter of the turning nozzle part 22 is smaller than that of the straight pipe part 21, and the burner assembly 2 has a straight structure with a thin front end and a thick rear end, so it is easier to be sleeved in the silicon carbide sleeve 3.

[0026] As Figures 2 - 4 shown, the straight pipe part 21 penetrates vertically into the kiln 1 through the kiln wall of the kiln 1, and the nozzle opening direction of the turning nozzle part 22 is perpendicular to the length direction of the straight pipe part 21. In this way, the installation method of the burner assembly 2 on the kiln 1 is similar to that of the traditional burner, which helps to reduce the construction difficulty and lower the equipment cost.

[0027] As Figures 2 to 4 shown, the respective burner assemblies 2 are uniformly arranged and installed on the kiln wall of the kiln 1, and the lengths of the straight pipe parts 21 of the respective burner assemblies 2 in the kiln 1 are set to be the same or different. Preferably, the lengths of the straight pipe parts 21 of several groups of burner assemblies 2 installed on the top wall and the bottom wall of the kiln 1 are set to be the same, and the straight pipe parts 21 of several groups of burner assemblies 2 installed on the side wall of the kiln 1 are arranged in a staggered manner with different lengths, so that the temperature distribution at the left, middle, and right kiln positions on the cross-section of the kiln 1 is more uniform, the physical and chemical performance indexes of the fired ceramic products are consistent, and the product quality is greatly improved.

Claims

1. A longitudinal flame roller kiln, comprising a kiln (1) and a plurality of burner assemblies (2), wherein the burner assemblies (2) comprise a straight pipe portion (21) and a curved nozzle portion (22) of an integral structure, wherein the straight pipe portion (21) extends into the interior of the kiln (1) and is fixedly mounted on the kiln wall of the kiln (1), and the nozzle opening direction of the curved nozzle portion (22) is in the same direction as the length direction of the kiln (1), characterized in that: The nozzle opening of the curved nozzle portion (22) is arranged flush with the outer wall of the straight tube portion (21).

2. The longitudinal flame roller kiln according to claim 1, characterized in that: It also comprises a silicon carbide sleeve (3), and the straight tube portion (21) and the turning nozzle portion (22) are both sleeved with the silicon carbide sleeve (3).

3. The longitudinal flame roller kiln according to claim 2, characterized in that: The turning nozzle portion (22) is composed of a tapered transition portion (221) and an arc-shaped elbow portion (222); the large end of the tapered transition portion (221) is connected to the straight tube portion (21); the small end of the tapered transition portion (221) is connected to the arc-shaped elbow portion (222); and the end of the arc-shaped elbow portion (222) is arranged flush with the small end of the tapered transition portion (221), so that the burner assembly (2) is in the shape of a straight tube as a whole.

4. The longitudinal flame roller kiln according to claim 1, characterized in that: The straight pipe portion (21) is perpendicular to the kiln wall of the kiln (1) and penetrates into the kiln (1); the nozzle opening direction of the turning nozzle portion (22) is perpendicular to the length direction of the straight pipe portion (21).

5. The longitudinal flame roller kiln according to claim 4, characterized in that: The burner assemblies (2) are evenly arranged and installed on the kiln wall of the kiln (1), and the straight pipe parts (21) of the burner assemblies (2) in the kiln (1) are arranged to be of the same length or of different lengths.

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