A device for recycling waste heat from a kiln

Abstract

The application discloses a kiln waste heat recycling device, which comprises a kiln heating section, a kiln cooling section, a circulating fan, a pipeline and a waste heat utilization device; the circulating fan comprises a shell and an impeller; the impeller comprises a back cover plate, a front cover plate and blades; the blades comprise a first blade part and a second blade part; the first blade part and the second blade part are divided by a midpoint in the axial direction of the blades; the radial outer edge of the first blade part is provided with a first concave notch, the first concave notch is recessed to the radial inner side, the second blade part is provided with a second concave notch, and the second concave notch is recessed to the radial outer side; the first blade part comprises a first arc section, a first straight section and a second arc section; and the second blade part comprises a third arc section, a second straight section and a fourth arc section. The application can reduce the air volume loss, improve the air supply stability, improve the air supply efficiency and reduce the noise, so that the stable and efficient operation of the kiln waste heat recycling device can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste heat recovery, in particular to a kiln waste heat recovery and recycling device. BACKGROUND

[0002] The existing kiln waste heat recovery and recycling device comprises a kiln heating section, a kiln cooling section, a circulating fan, a first pipeline, a second pipeline, and a waste heat utilization device. The kiln heating section is used for heating / drying in the manufacturing process of ceramic tile products. The kiln heating section is connected to the kiln cooling section. The top of the downstream end of the kiln cooling section is connected to the top of the upstream end of the kiln heating section through the first pipeline. The circulating fan and a control valve are connected to the first pipeline. The top of the downstream end of the kiln cooling section is connected to the waste heat utilization device through the second pipeline. The first pipeline and the second pipeline have a common main pipeline section. The circulating fan comprises a shell, an impeller, a motor, and an inlet pipe. The impeller is rotatably installed in the shell and is drivingly connected to the motor. The front end of the shell is connected to the inlet pipe. The impeller comprises a rear cover plate, a front cover plate, and blades. The blades are uniformly distributed in the circumferential direction and are arranged between the rear cover plate and the front cover plate. However, the existing circulating fan still has the problems of large air volume loss, large noise, and reduced air supply stability / efficiency. The stability and efficiency of the kiln waste heat recovery and recycling device need to be further improved. SUMMARY

[0003] The present application aims to overcome the deficiencies in the prior art and provide a kiln waste heat recovery and recycling device. Through the design / improvement of the blades of the circulating fan, the air volume loss is reduced, the air supply stability is improved, the air supply efficiency is improved, and the noise is reduced, thereby ensuring the stable and efficient operation of the kiln waste heat recovery and recycling device.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0005] A kiln waste heat recycling device, comprising a kiln heating section (1), a kiln cooling section (2), a circulating fan (3), a first pipeline (4), a second pipeline (5), a waste heat utilization device (6), the kiln heating section is used for heating / drying in the manufacturing process of ceramic tile products, the kiln heating section is connected with the kiln cooling section, the top of the downstream end of the kiln cooling section is connected with the top of the upstream end of the kiln heating section through the first pipeline, the circulating fan and the control valve are connected on the first pipeline, the top of the downstream end of the kiln cooling section is connected with the waste heat utilization device through the second pipeline, the first pipeline and the second pipeline have a common main pipeline section; the circulating fan (3) comprises a shell (31), an impeller (32), a motor (33) and an inlet pipe (34), the impeller is rotatably installed in the shell and is in transmission connection with the motor, the front end of the shell is connected with the inlet pipe, the impeller comprises a rear cover plate (35), a front cover plate (36) and blades (37), the plurality of blades are uniformly distributed in the circumferential direction and are arranged between the rear cover plate and the front cover plate; characterized in that: the blade comprises a first blade part (371) and a second blade part (372), the first blade part and the second blade part are divided by a midpoint in the axial direction of the blade as a boundary line, only the radial outer edge of the first blade part is provided with a first concave notch (373), the first concave notch is recessed to the radial inner side, only the second blade part is provided with a second concave notch (374), the second concave notch is recessed to the radial outer side.

[0006] Further, the first concave notch (373) is arranged adjacent to the boundary line, the second concave notch (374) is arranged adjacent to the boundary line, and the first concave notch and the second concave notch are respectively located on both sides of the boundary line in the axial direction.

[0007] Further, the first concave notch and the second concave notch are in the structure of an equilateral triangle or an isosceles triangle.

[0008] Further, the first blade part (371) comprises a first arc-shaped section (375), a first straight section and a second arc-shaped section (376), the first arc-shaped section, the first straight section and the second arc-shaped section are sequentially arranged from the radial outer side to the radial inner side, the radial length of each of the first arc-shaped section and the second arc-shaped section accounts for less than 20% of the total radial length of the first blade part; the first arc-shaped section is curved in a first direction, the second arc-shaped section is curved in a second direction, and the first direction and the second direction are two directions opposite in the circumferential direction.

[0009] Further, the second blade part (372) comprises a third arc-shaped section (377), a second straight section and a fourth arc-shaped section (378), the third arc-shaped section, the second straight section and the fourth arc-shaped section are sequentially arranged from the radial outer side to the radial inner side, the radial length of each of the third arc-shaped section and the fourth arc-shaped section accounts for less than 20% of the total radial length of the second blade part; the third arc-shaped section is curved in the second direction, and the fourth arc-shaped section is curved in the first direction.

[0010] Further, the first arc-shaped section (375) has a radial length and a curvature substantially equal to those of the second arc-shaped section, the third arc-shaped section and the fourth arc-shaped section.

[0011] Further, the first straight section and the second straight section have a radial length substantially equal to each other.

[0012] Further, the first concave notch (373) and the second concave notch (374) have a radial depth within 20% of the total radial length of the first blade part or the second blade part.

[0013] Further, the circulating fan (3) is a centrifugal fan.

[0014] The kiln waste heat recycling device can reduce air volume loss, improve air supply stability, improve air supply efficiency and reduce noise, thereby ensuring stable and efficient operation of the kiln waste heat recycling device. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Figure 1 is a schematic diagram of the principle of the kiln waste heat recycling device of the present application;

[0016] Figure 2 Figure 2 is a schematic diagram of the structure of the circulating fan of the present application;

[0017] Figure 3 Figure 3 is a schematic diagram of the impeller structure of the circulating fan of the present application;

[0018] Figure 4 Figure 4 is a schematic diagram of the blade (first blade part) structure of the circulating fan of the present application;

[0019] Figure 5 Figure 5 is a schematic diagram of the blade (second blade part) structure of the circulating fan of the present application.

[0020] In the figure: kiln heating section 1, kiln cooling section 2, circulating fan 3, first pipeline 4, second pipeline 5, waste heat utilization device 6, shell 31, impeller 32, motor 33, inlet pipe 34, rear cover plate 35, front cover plate 36, blade 37, first blade part 371, second blade part 372, first concave notch 373, second concave notch 374, first arc-shaped section 375, second arc-shaped section 376, third arc-shaped section 377, fourth arc-shaped section 378. DETAILED DESCRIPTION

[0021] To make the technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of the present invention, and are only used to explain the present invention, not to limit the present invention. It should be noted that, for ease of description, only the parts / structures related to the present invention are shown in the accompanying drawings. Other related parts can be referred to with ordinary design. In the absence of conflict, the embodiments and technical features in the embodiments of the present invention can be combined with each other to obtain new embodiments.

[0022] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. Furthermore, unless otherwise defined, the technical or scientific terms used in the description of this invention should have the ordinary meaning understood by those skilled in the art.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings.

[0024] like Figures 1-5 As shown, a kiln waste heat recovery and reuse device includes a kiln heating section 1, a kiln cooling section 2, a circulating fan 3, a first pipe 4, a second pipe 5, and a waste heat utilization device 6. The kiln heating section 1 is used for heating / drying in the manufacturing process of ceramic tile products. The kiln heating section 1 is connected to the kiln cooling section 2. The top of the downstream end of the kiln cooling section 2 is connected to the top of the upstream end of the kiln heating section 1 through the first pipe 4. The circulating fan 3 and a control valve are connected to the first pipe 4. The top of the downstream end of the kiln cooling section 2 is connected to the waste heat utilization device 6 through the second pipe 5. The first pipe 4 and the second pipe 5 have a common main pipe section.

[0025] The circulating fan 3 includes a housing 31, an impeller 32, a motor 33, and an inlet pipe 34. The impeller 32 is rotatably mounted inside the housing 31 and is connected to the motor 33 for transmission. The inlet pipe 34 is connected to the front / upstream end of the housing 31. The impeller 32 includes a rear cover plate 35, a front cover plate 36, and blades 37. Multiple blades 37 are evenly distributed circumferentially and disposed between the rear cover plate 35 and the front cover plate 36. The blades 37 are characterized in that they include a first blade portion 371 and a second blade portion 372, with the midpoint of the blade's axial direction (such as...) serving as the dividing line. Figure 3 As shown by the dashed line, only the radial outer edge of the first blade portion 371 is provided with a first recessed notch 373, which is recessed radially inward, and only the second blade portion 372 is provided with a second recessed notch 374, which is recessed radially outward.

[0026] The first concave notch 373 is arranged adjacent to / next to the boundary line, the second concave notch 374 is arranged adjacent to / next to the boundary line, and the first concave notch 373 and the second concave notch 374 are respectively located on both sides of the axial direction of the boundary line.

[0027] The first concave notch 373 and the second concave notch 374 are in an equilateral or isosceles triangular structure.

[0028] The kiln waste heat recovery and recycling device of the present application can reduce air volume loss, improve air supply stability, improve air supply efficiency, and reduce noise, thereby ensuring stable and efficient operation of the kiln waste heat recovery and recycling device.

[0029] Further, the first blade part 371 includes a first arc-shaped section 375, a first straight section, and a second arc-shaped section 376, which are arranged in sequence from the radial outside to the radial inside, and the radial lengths of the first arc-shaped section 375 and the second arc-shaped section 376 each account for less than 20% of the total radial length of the first blade part 371.

[0030] The first arc-shaped section 375 is curved in a first direction, and the second arc-shaped section 376 is curved in a second direction, the first direction and the second direction being two directions opposite in the circumferential direction.

[0031] The second blade part 372 includes a third arc-shaped section 377, a second straight section, and a fourth arc-shaped section 378, which are arranged in sequence from the radial outside to the radial inside, and the radial lengths of the third arc-shaped section 377 and the fourth arc-shaped section 378 each account for less than 20% of the total radial length of the second blade part 372.

[0032] The third arc-shaped section 377 is curved in the second direction, and the fourth arc-shaped section 378 is curved in the first direction.

[0033] In an embodiment, the radial lengths of the first arc-shaped section 375, the second arc-shaped section 376, the third arc-shaped section 377, and the fourth arc-shaped section 378 are substantially equal, and the curvatures are substantially equal.

[0034] The radial lengths of the first straight section and the second straight section are substantially equal.

[0035] The radial depths of the first concave notch 373 and the second concave notch 374 each account for less than 20% of the total radial length of the first blade part 371 or the second blade part 372.

[0036] The circulating fan 3 is a centrifugal fan.

[0037] The kiln waste heat recovery and recycling device of the present application can further better reduce the air volume loss, improve the air supply stability, further improve the air supply efficiency and reduce the noise, so as to guarantee the stable and efficient operation of the kiln waste heat recovery and recycling device.

[0038] The kiln waste heat recovery and recycling device of the present application can reduce the air volume loss, improve the air supply stability, improve the air supply efficiency and reduce the noise, so as to guarantee the stable and efficient operation of the kiln waste heat recovery and recycling device.

[0039] The above embodiments are illustrative of the present application, not a limitation of the present application, and it can be understood that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the protection scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A kiln waste heat recovery and recycling device, comprising a kiln heating section (1), a kiln cooling section (2), a circulating fan (3), a first pipeline (4), a second pipeline (5), and a waste heat utilization device (6); the kiln heating section and the kiln cooling section are connected, the top of the downstream end of the kiln cooling section is connected to the top of the upstream end of the kiln heating section through the first pipeline, the circulating fan and a control valve are connected to the first pipeline, and the top of the downstream end of the kiln cooling section is connected to the waste heat utilization device through the second pipeline; the circulating fan comprises a shell (31), an impeller (32), a motor (33), and an inlet pipe (34); the impeller is rotatably installed in the shell and is in transmission connection with the motor; the front end of the shell is connected with the inlet pipe; the impeller comprises a rear cover plate (35), a front cover plate (36), and blades (37); the blades are uniformly distributed in the circumferential direction and are arranged between the rear cover plate and the front cover plate. characterized in that The blade comprises a first blade part (371) and a second blade part (372); the first blade part and the second blade part are divided by a midpoint in the axial direction of the blade; the radial outer edge of the first blade part is provided with a first concave notch (373) which is recessed towards the radial inner side; the second blade part is provided with a second concave notch (374) which is recessed towards the radial outer side; the first concave notch is arranged adjacent to the dividing line, the second concave notch is arranged adjacent to the dividing line, and the first concave notch and the second concave notch are respectively located on both sides of the dividing line in the axial direction; the first concave notch and the second concave notch are in gas communication in the entire radial direction of the blade, and the first concave notch and the second concave notch are in gas communication in the entire axial direction of the blade. The first blade part (371) comprises a first arc-shaped section (375), a first straight section, and a second arc-shaped section (376); the first arc-shaped section, the first straight section, and the second arc-shaped section are arranged in sequence from the radial outer side to the radial inner side; the radial length of the first arc-shaped section and the radial length of the second arc-shaped section each account for less than 20% of the total radial length of the first blade part; the first arc-shaped section is curved in a first direction, and the second arc-shaped section is curved in a second direction; the first direction and the second direction are two directions opposite in the circumferential direction. The second blade part (372) comprises a third arc-shaped section (377), a second straight section, and a fourth arc-shaped section (378); the third arc-shaped section, the second straight section, and the fourth arc-shaped section are arranged in sequence from the radial outer side to the radial inner side; the radial length of the third arc-shaped section and the radial length of the fourth arc-shaped section each account for less than 20% of the total radial length of the second blade part; the third arc-shaped section is curved in the second direction, and the fourth arc-shaped section is curved in the first direction.

2. A device for recovering and reusing waste heat of a kiln according to claim 1, wherein The first concave notch and the second concave notch have an equilateral or isosceles triangular structure.

3. A device for recovering and reusing waste heat of a kiln according to claim 1, wherein The radial length of the first arc-shaped section (375) is substantially equal to the radial length of the second arc-shaped section, the third arc-shaped section, and the fourth arc-shaped section, and the curvatures are substantially equal.

4. A device for recovering and reusing waste heat of a kiln according to claim 3, wherein The radial length of the first straight section is substantially equal to the radial length of the second straight section.

5. A device for recovering and reusing waste heat of a kiln according to claim 4, wherein The radial depth of the first concave notch (373) and the radial depth of the second concave notch (374) each account for less than 20% of the total radial length of the first blade part or the second blade part.

6. A device for recovering and reusing waste heat of a kiln according to claim 1, wherein The circulating fan (3) is a centrifugal fan.

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