LU503696B1

LU503696B1 - Air heater for raising inlet temperature of blower for thermal power station

Info

Publication number: LU503696B1
Application number: LU503696A
Authority: LU
Inventors: Guannan Liu; Ping Sun; Qingjie Huang; Jingxian Tian; Dongming Du; Zhijia Yang; Peng Qu; Zhonghua Zhang; Tao Sun; Lei Cao; Xiangsheng Meng; Qingzhi Yang
Original assignee: Huaneng Power Int Inc Yingkou Power Plant
Priority date: 2022-03-24
Filing date: 2023-03-20
Publication date: 2023-09-25
Also published as: CN114777153A

Abstract

An air heater for raising an inlet temperature of a blower for a thermal power station is provided according to the present application, which includes an impeller mechanism. The impeller mechanism is arranged inside a compression air duct. An exhaust-gas heat exchange pipe is arranged outside the middle of the compression air duct. An internal end of the compression air duct is provided with a flow stabilizing mechanism, and a multi-connected housing mechanism is provided outside the compression air duct. The impeller mechanism cooperates with the compression air duct to compress the air. During the compression process, the air temperature is raised, and the air in the air duct is heated by the exhaust-gas heat exchange pipe at the same time, so that the energy consumption is greatly reduced. The vibration caused by the rotation of the fan is reduced by the coaxial counter-rotating fan mechanism, and the generation of uneven air flow and vortex is reduced by the flow stabilizing mechanism, so that the sources of vibration and noise are intrinsically reduced, thereby reducing the noise and prolonging the service life of the equipment, and reducing the maintenance cost of the production equipment.

Description

AIR HEATER FOR RAISING INLET TEMPERATURE OF BLOWER FOR

THERMAL POWER STATION

FIELD

[0001] The present application relates to the technical field of thermoelectric equipment, in particular to an air heater for raising an inlet temperature of a blower for a thermal power station.

BACKGROUND

[0002] In winter, a temperature of the air sent into an interior of a thermal power station through an air inlet is low, which is not conducive to improving the combustion efficiency. In the conventional air heating method at an air inlet of the thermal power station, a fan is generally used as a power source for air supply, and a fin-tube heat exchanger is used as a heating source.

[0003] The conventional method not only consumes a lot of energy, but is also easy to cause large vibration of an air duct due to a large ventilation volume of a thermoelectric air inlet shaft. On the one hand, the vibration may lead to larger noise, and on the other hand, continuous vibration may cause structural weld cracking of a fan housing and tearing of the air duct, which shortens the service life of the equipment and increases the maintenance cost of the equipment.

SUMMARY

[0004] In view of the above problems, an air heater for raising an inlet temperature of a blower for a thermal power station is provided according to the present application, so as to solve the technical problems raised in the above background technology, such as high energy consumption of the conventional heating method, and large noise and equipment damage caused by large vibration of the air duct.

[0005] In order to achieve the above object, the following technical solutions are provided according to the present application. An air heater for raising an inlet temperature of a blower for a thermal power station includes an impeller mechanism. The impeller mechanism is -1-

arranged inside a compression air duct. An exhaust-gas heat exchange pipe is arranged outside the middle of the compression air duct. An internal end of the compression air duct is provided with a flow stabilizing mechanism, and a multi-connected housing mechanism 1s provided outside the compression air duct.

[0006] Further, the impeller mechanism includes a coaxial counter-rotating fan mechanism.

One end of the coaxial counter-rotating fan mechanism is provided with an impeller rotating shaft. One end of the impeller rotating shaft is provided with multiple low-pressure rotor impellers, and the middle of the impeller rotating shaft is provided with multiple high-pressure rotor impellers. Two sides of the multiple high-pressure rotor impellers located in the middle of the impeller rotating shaft are each provided with a rotating shaft bracket.

Another end of the impeller rotating shaft is coaxially connected with an output end of a rotating shaft motor. The rotating shaft motor is arranged on one side of one of the rotating shaft brackets. A motor housing is provided outside the rotating shaft motor.

[0007] Further, the coaxial counter-rotating fan mechanism includes a first fan. The first fan is coaxially connected to one end of a coaxial counter-rotating mechanism, and another end of the coaxial counter-rotating mechanism is coaxially connected with a second fan. The second fan is coaxially connected to one end of the impeller rotating shaft. The coaxial counter-rotating mechanism is arranged at another internal end of the compression air duct.

[0008] Further, rotation directions of the first fan and the second fan are opposite.

[0009] Further, the coaxial counter-rotating mechanism includes a double-shaft motor. One end of the double-shaft motor is coaxially connected with the second fan. The double-shaft motor is arranged on one side of a gear bracket. An internal side of the gear bracket 1s provided with a first bevel gear. The first bevel gear is coaxially connected to another end of the double-shaft motor. The first bevel gear is meshed with one side of multiple counter-rotating bevel gears. The multiple counter-rotating bevel gears are rotatably connected to an interior of the gear bracket. Another side of the multiple counter-rotating bevel gears is meshed with a second bevel gear, and the second bevel gear is coaxially connected with the first fan.

[0010] Further, the compression air duct includes an air duct body. The air duct body is contracted in the middle. One side of the multiple high-pressure rotor impellers located in the middle of the air duct body is provided with multiple high-pressure stator impellers, and one -2-

side of the multiple low-pressure rotor impellers located at an internal end of the air duct body is provided with multiple low-pressure stator impellers.

[0011] Further, blade directions of the multiple low-pressure rotor impellers are opposite to blade directions of the multiple low-pressure stator impellers; and blade directions of the multiple high-pressure rotor impellers are opposite to blade directions of the multiple high-pressure stator impellers.

[0012] Further, the flow stabilizing mechanism includes a central cylinder. Multiple wing plates are provided outside the central cylinder.

[0013] Further, the multi-connected housing mechanism includes a hexagonal prismatic housing. Multiple side surfaces of the hexagonal prismatic housing are each provided with a multi-connected sliding groove, and the remaining side surfaces of the hexagonal prismatic housing are each provided with a multi-connected sliding block.

[0014] Further, a contacting-bead bottom box is provided inside each multi-connected sliding groove. A locking contacting-bead is embedded in an upper portion of the contacting-bead bottom box. A contacting-bead spring is provided between a lower portion of the locking contacting-bead and a lower portion of the contacting-bead bottom box. A contacting-bead clamping groove is defined at one end of each multi-connected sliding block.

[0015] Compared with the conventional technology, the present application has the following beneficial effects.

[0016] The impeller mechanism cooperates with the compression air duct to compress the air. During the compression process, the air temperature is raised, and the air in the air duct is heated by the exhaust-gas heat exchange pipe at the same time, so that the energy consumption is greatly reduced. The vibration caused by the rotation of the fan is reduced by the coaxial counter-rotating fan mechanism, and the generation of uneven air flow and vortex is reduced by the flow stabilizing mechanism, so that the sources of vibration and noise are intrinsically reduced, thereby reducing the noise and prolonging the service life of the equipment, and reducing the maintenance cost of the production equipment.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 is a schematic structural view showing an appearance of an air heater of the -3-

present application;

[0018] FIG. 2 is a cross-sectional view of the internal structure of the air heater of the present application;

[0019] FIG. 3 is a side, cross-sectional view of the internal structure of the air heater of the present application;

[0020] FIG. 4 is a schematic structural view of an impeller mechanism of the present application;

[0021] FIG. 5 is a schematic structural view of a coaxial counter-rotating mechanism of the present application;

[0022] FIG. 6 is a cross-sectional view of the internal structure of a compression air duct of the present application;

[0023] FIG. 7 is a schematic structural view of a flow stabilizing mechanism of the present application;

[0024] FIG. 8 is a schematic structural view of a multi-connected housing mechanism of the present application; and

[0025] FIG. 9 is a cross-sectional view of the multi-connected housing mechanism of the present application.

[0026] Reference numerals in the drawings are listed as follows: 1 impeller mechanism; 11 coaxial counter-rotating fan mechanism; 111 first fan; 112 coaxial counter-rotating mechanism; 1121 double-shaft motor; 1122 gear bracket, 1123 first bevel gear, 1124 counter-rotating bevel gear, 1125 second bevel gear; 113 second fan; 12 impeller rotating shaft; 13 low-pressure rotor impeller; 14 high-pressure rotor impeller; 15 rotating shaft bracket; 16 rotating shaft motor; 17 motor housing; 2 compression air duct; 21 air duct body; 22 high-pressure stator impeller; 23 low-pressure stator impeller; 3 exhaust-gas heat exchange pipe; 4 flow stabilizing mechanism; 41 central cylinder; 42 wing plate; 5 multi-connected housing mechanism; 51 hexagonal prismatic housing; 52 multi-connected sliding groove; 521 contacting-bead bottom box; 522 locking contacting-bead; 523 contacting-bead spring; 53 multi-connected sliding block; 531 contacting-bead clamping groove. „4 -

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to facilitate the understanding of the present application, the present application will be described in full details with reference to the relevant drawings. Several embodiments of the present application are shown in the accompanying drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more through and comprehensive.

[0028] It should be noted that, if an element is referred to as being "fixed" to another element, the former element can be directly on the latter element, or there may be an intermediate element existing therebetween. If an element is considered to be "connected" to another element, the former element can be directly connected to the latter element, or there may be an intermediate element existing therebetween. The terms "vertical", "horizontal", "left", and "right" and similar expressions used in this specification are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which the present application pertains. Terms used in the present application are aimed at describing particular embodiments and are not aimed to limit the present application. The term "and/or" used herein includes any and all combinations of one or more of the related listed items.

[0030] Referring to FIGS. 1 to 3, in an embodiment, an air heater for raising an inlet temperature of a blower for a thermal power station includes an impeller mechanism 1. The impeller mechanism 1 is arranged inside a compression air duct 2. An exhaust-gas heat exchange pipe 3 is arranged outside the middle of the compression air duct 2. An internal end of the compression air duct 2 is provided with a flow stabilizing mechanism 4, and a multi-connected housing mechanism 5 is provided outside the compression air duct 2.

[0031] With particular reference to FIG. 4, in an embodiment, the impeller mechanism 1 includes a coaxial counter-rotating fan mechanism 11. One end of the coaxial counter-rotating fan mechanism 11 is provided with an impeller rotating shaft 12. One end of the impeller rotating shaft 12 is provided with multiple low-pressure rotor impellers 13, and the middle of the impeller rotating shaft 12 is provided with multiple high-pressure rotor impellers 14. Two sides of the multiple high-pressure rotor impellers 14 located in the middle of the impeller -5.

rotating shaft 12 are each provided with a rotating shaft bracket 15. Another end of the impeller rotating shaft 12 is coaxially connected with an output end of a rotating shaft motor 16. The rotating shaft motor 16 is arranged on one side of one of the rotating shaft brackets 15.

A motor housing 17 is provided outside the rotating shaft motor 16. The coaxial counter-rotating fan mechanism 11 includes a first fan 111. The first fan 111 is coaxially connected to one end of a coaxial counter-rotating mechanism 112, and another end of the coaxial counter-rotating mechanism 112 is coaxially connected with a second fan 113. The second fan 113 is coaxially connected to one end of the impeller rotating shaft 12. The coaxial counter-rotating mechanism 112 is arranged at another internal end of the compression air duct 2. Rotation directions of the first fan 111 and the second fan 113 are opposite. In this design, the air is sucked into the air duct by the coaxial counter-rotating fan mechanism 11; the coaxial counter-rotating fan mechanism 11 and the rotating shaft motor 16 together drive the impeller rotating shaft 12 to rotate, and further drive the multiple low-pressure rotor impellers 13 and the multiple high-pressure rotor impellers 14 to rotate, so as to cooperate with the compression air duct 2 to compress the air in the air duct.

[0032] With particular reference to FIG. 5, in an embodiment, the coaxial counter-rotating mechanism 112 includes a double-shaft motor 1121. One end of the double-shaft motor 1121 is coaxially connected with the second fan 113. The double-shaft motor 1121 is arranged on one side of a gear bracket 1122. An internal side of the gear bracket 1122 is provided with a first bevel gear 1123. The first bevel gear 1123 is coaxially connected to another end of the double-shaft motor 1121. The first bevel gear 1123 is meshed with one side of multiple counter-rotating bevel gears 1124. The multiple counter-rotating bevel gears 1124 are rotatably connected to an interior of the gear bracket 1122. Another side of the multiple counter-rotating bevel gears 1124 is meshed with a second bevel gear 1125, and the second bevel gear 1125 is coaxially connected with the first fan 111. In this design, the double-shaft motor 1121 drives the second fan 113 and the first bevel gear 1123 to rotate simultaneously, then drives the second bevel gear 1125 to rotate via the multiple counter-rotating bevel gears 1124, and then drives the first fan 111 to rotate, so as to realize the coaxial counter-rotating of the first fan 111 and the second fan 113, and further reduce the vibration generated during working of the fan.

[0033] With particular reference to FIG. 6, in an embodiment, the compression air duct 2 includes an air duct body 21. The air duct body 21 is contracted in the middle. One side of the -6-

multiple high-pressure rotor impellers 14 located in the middle of the air duct body 21 is provided with multiple high-pressure stator impellers 22, and one side of the multiple low-pressure rotor impellers 13 located at an internal end of the air duct body 21 is provided with multiple low-pressure stator impellers 23. Blade directions of the multiple low-pressure rotor impellers 13 are opposite to blade directions of the multiple low-pressure stator impellers 23; and blade directions of the multiple high-pressure rotor impellers 14 are opposite to blade directions of the multiple high-pressure stator impellers 22. In this design, the multiple low-pressure rotor impellers 13 cooperate with the multiple low-pressure stator impellers 23 to compress the air sucked by the fan for the first time; then, the compressed air is sent to the contracted middle of the air duct; and the multiple high-pressure rotor impellers 14 cooperate with the multiple high-pressure stator impellers 22 to further compress the air in the middle of the air duct, so as to raise the air temperature and preheat the air.

[0034] With particular reference to FIG. 7, in an embodiment, the flow stabilizing mechanism 4 includes a central cylinder 41. Multiple wing plates 42 are provided outside the central cylinder 41. In this design, the central cylinder 41 and the multiple wing plates 42 eliminate the airflow pressure fluctuation such as uneven airflow and vortex, evenly distribute the air flow at the inlet of the fan, and eliminate the vibration and noise at the inlet of the fan collector, so that the generation of the airflow pressure fluctuation such as uneven airflow and vortex is avoided, the compressed airflow is evenly distributed, the sources of vibration and noise at the outlet of the fan are eliminated, and the vibration and fracture of related accessory parts are effectively avoided or reduced.

[0035] With particular reference to FIGS. 8 to 9, in an embodiment, the multi-connected housing mechanism 5 includes a hexagonal prismatic housing 51. Multiple side surfaces of the hexagonal prismatic housing 51 are each provided with a multi-connected sliding groove 52, and the remaining side surfaces of the hexagonal prismatic housing 51 are each provided with a multi-connected sliding block 53. A contacting-bead bottom box 521 is provided inside each multi-connected sliding groove 52. A locking contacting-bead 522 is embedded in an upper portion of the contacting-bead bottom box 521. A contacting-bead spring 523 is provided between a lower portion of the locking contacting-bead 522 and a lower portion of the contacting-bead bottom box 521. A contacting-bead clamping groove 531 is defined at one end of each multi-connected sliding block 53. In this design, through the cooperation of the multi-connected clamping grooves 52 and the multi-connected sliding blocks 53, multiple air -7-

heaters of the present application can be combined into different sizes and shapes, so as to adapt to different air inlets.

[0036] The operation principle is as follows. Firstly, the double-shaft motor 1121 drives the second fan 113 and the first bevel gear 1123 to rotate simultaneously, then drives the second bevel gear 1125 to rotate via the multiple counter-rotating bevel gears 1124, and then drives the first fan 111 to rotate, so as to realize the coaxial counter-rotating of the first fan 111 and the second fan 113, and further reduce the vibration generated during working of the fan. The air is sucked into the air duct by the coaxial counter-rotating fan mechanism 11. The coaxial counter-rotating fan mechanism 11 and the rotating shaft motor 16 together drive the impeller rotating shaft 12 to rotate, and further drive the multiple low-pressure rotor impellers 13 and the multiple high-pressure rotor impellers 14 to rotate, so as to cooperate with the compression air duct 2 to compress the air in the air duct. The multiple low-pressure rotor impellers 13 cooperate with the multiple low-pressure stator impellers 23 to compress the air sucked by the fan for the first time; then, the compressed air is sent to the contracted middle of the air duct; and the multiple high-pressure rotor impellers 14 cooperate with the multiple high-pressure stator impellers 22 to further compress the air in the middle of the air duct, so as to raise the air temperature and cooperate with the exhaust-gas heat exchange pipe 3 to preheat the air. The heated air enters the thermoelectric equipment through the flow stabilizing mechanism 4. The central cylinder 41 and the multiple wing plates 42 eliminate the airflow pressure fluctuation such as uneven airflow and vortex, evenly distribute the air flow at the inlet of the fan, and eliminate the vibration and noise at the inlet of the fan collector, so that the generation of the airflow pressure fluctuation such as uneven airflow and vortex is avoided, the compressed airflow is evenly distributed, the sources of vibration and noise at the outlet of the fan are eliminated, and the vibration and fracture of related accessory parts are effectively avoided or reduced.

[0037] The above exemplary description of the present application is made in combination with the accompanying drawings. Obviously, the specific implementation of the present application is not limited to the above forms. The situations in which only non-substantive improvements are made to the concept and technical solution of the present application, or the situations in which the concept and technical solution of the present application are directly applied to other occasions without improvements, shall fall within the scope of protection of the present application. -8-

Claims

1. An air heater for raising an inlet temperature of a blower for a thermal power station, comprising an impeller mechanism (1), wherein the impeller mechanism (1) is arranged inside a compression air duct (2); an exhaust-gas heat exchange pipe (3) is arranged outside the middle of the compression air duct (2); an internal end of the compression air duct (2) is provided with a flow stabilizing mechanism (4); and a multi-connected housing mechanism (5) is provided outside the compression air duct (2).

2. The air heater for raising an inlet temperature of a blower for a thermal power station according to claim 1, wherein the impeller mechanism (1) comprises a coaxial counter-rotating fan mechanism (11), wherein one end of the coaxial counter-rotating fan mechanism (11) is provided with an impeller rotating shaft (12); one end of the impeller rotating shaft (12) is provided with a plurality of low-pressure rotor impellers (13), and the middle of the impeller rotating shaft (12) is provided with a plurality of high-pressure rotor impellers (14); two sides of the plurality of high-pressure rotor impellers (14) located in the middle of the impeller rotating shaft (12) are each provided with a rotating shaft bracket (15); another end of the impeller rotating shaft (12) is coaxially connected with an output end of a rotating shaft motor (16); the rotating shaft motor (16) is arranged on one side of one of the rotating shaft brackets (15); and a motor housing (17) is provided outside the rotating shaft motor (16).

3. The air heater for raising an inlet temperature of a blower for a thermal power station according to claim 2, wherein the coaxial counter-rotating fan mechanism (11) comprises a first fan (111), wherein the first fan (111) is coaxially connected to one end of a coaxial counter-rotating mechanism (112), and another end of the coaxial counter-rotating mechanism (112) is coaxially connected with a second fan (113); the second fan (113) is coaxially connected to one end of the impeller rotating shaft (12); and the coaxial counter-rotating mechanism (112) is arranged at another internal end of the compression air duct (2).

-9.

4. The air heater for raising an inlet temperature of a blower for a thermal power station according to claim 3, wherein rotation directions of the first fan (111) and the second fan (113) are opposite.

5. The air heater for raising an inlet temperature of a blower for a thermal power station according to claim 3, wherein the coaxial counter-rotating mechanism (112) comprises a double-shaft motor (1121), wherein one end of the double-shaft motor (1121) is coaxially connected with the second fan (113); the double-shaft motor (1121) is arranged on one side of a gear bracket (1122); an internal side of the gear bracket (1122) is provided with a first bevel gear (1123); the first bevel gear (1123) is coaxially connected to another end of the double-shaft motor (1121); the first bevel gear (1123) is meshed with one side of a plurality of counter-rotating bevel gears (1124); the plurality of counter-rotating bevel gears (1124) are rotatably connected to an interior of the gear bracket (1122); another side of the plurality of counter-rotating bevel gears (1124) is meshed with a second bevel gear (1125), and the second bevel gear (1125) is coaxially connected with the first fan (111).

6. The air heater for raising an inlet temperature of a blower for a thermal power station according to claim 2, wherein the compression air duct (2) comprises an air duct body (21), wherein the air duct body (21) is contracted in the middle; one side of the plurality of high-pressure rotor impellers (14) located in the middle of the air duct body (21) is provided with a plurality of high-pressure stator impellers (22), and one side of the plurality of low-pressure rotor impellers (13) located at an internal end of the air duct body (21) is provided with a plurality of low-pressure stator impellers (23).

7. The air heater for raising an inlet temperature of a blower for a thermal power station according to claim 6, wherein blade directions of the plurality of low-pressure rotor impellers (13) are opposite to blade directions of the plurality of low-pressure stator impellers (23); and blade directions of the plurality of high-pressure rotor impellers (14) are opposite to blade directions of the plurality of high-pressure stator impellers (22). -10 -

8. The air heater for raising an inlet temperature of a blower for a thermal power station according to claim 1, wherein the flow stabilizing mechanism (4) comprises a central cylinder (41), wherein a plurality of wing plates (42) are provided outside the central cylinder (41).

9. The air heater for raising an inlet temperature of a blower for a thermal power station according to claim 1, wherein the multi-connected housing mechanism (5) comprises a hexagonal prismatic housing (51), wherein a plurality of side surfaces of the hexagonal prismatic housing (51) are each provided with a multi-connected sliding groove (52), and the remaining side surfaces of the hexagonal prismatic housing (51) are each provided with a multi-connected sliding block (53).

10. The air heater for raising an inlet temperature of a blower for a thermal power station according to claim 9, wherein a contacting-bead bottom box (521) is provided inside each multi-connected sliding groove (52); a locking contacting-bead (522) is embedded in an upper portion of the contacting-bead bottom box (521); a contacting-bead spring (523) is provided between a lower portion of the locking contacting-bead (522) and a lower portion of the contacting-bead bottom box (521); and a contacting-bead clamping groove (531) is defined at one end of each multi-connected sliding block (53). -11 -