Air preheater convenient to clean

Abstract

The utility model relates to the technical field of air preheaters, in particular to an air preheater convenient to clean, which comprises a heat insulation box, the inner wall of the heat insulation box is connected with a flue gas pipe, two ends of the flue gas pipe respectively extend to the outside of the heat insulation box, and a cleaning mechanism is arranged in the flue gas pipe. By arranging the impeller on the inner wall of the flue gas pipe, when flue gas is introduced into the flue gas pipe, airflow is formed to push the impeller to rotate, and when the impeller rotates, the scraping strip is driven to rotate together through the connecting rod, so that dust particles adhered to the inner wall of the flue gas pipe are conveniently scraped through rotation of the scraping strip; the problem that the heat transfer efficiency is affected when too much dust particles adhere is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of air preheaters, in particular to an air preheater which is easy to clean. Background Art

[0002] The air preheater uses the flue gas in the boiler's tail flue to preheat the air before it enters the boiler to a certain temperature through the internal heat sink. It is used to improve the heat exchange performance of the boiler and reduce energy consumption. It is generally referred to as an air preheater and is mostly used in coal-fired boilers.

[0003] The prior art, such as publication number CN210601708U, provides a preheater with high heat exchange efficiency, including a preheating box, a mounting plate fixedly installed on one side of the preheating box, a blower fixedly installed on the top of the mounting plate, a cold air inlet is drilled on the side of the preheating box close to the blower, the output end of the blower is fixedly connected to the cold air inlet, a spiral air duct is fixedly installed on the side of the cold air inlet away from the blower, a cold air outlet is drilled on the side of the preheating box away from the cold air inlet, one end of the spiral air duct away from the cold air inlet is fixedly connected to the cold air outlet, and a cold air separation pipe is fixedly installed on the side of the cold air outlet away from the spiral air duct. The beneficial effects of the utility model are as follows: the utility model uses a spiral air duct, so that the cold air stays in the preheater for a longer time and obtains more heat, while increasing the contact area between the cold air and the air duct, so that the cold air exchanges more heat in the same time.

[0004] In this scheme, after the flue gas is introduced into the preheating box in advance, the spiral air duct is used to make the cold air stay in the preheater for a longer time and obtain a higher heat. At the same time, the contact area between the cold air and the air duct is increased, so that the cold air can exchange more heat in the same time. However, the increase in the contact surface with the hot air through the spiral structure will increase the contact area between the spiral air duct and the flue gas, making it easier for dust particles in the flue gas to adhere. When there are too many adhered dust particles, it will affect the heat transfer efficiency, and the spiral structure is not conducive to the later cleaning of the spiral air duct. In view of this, we propose an air preheater that is easy to clean. Utility Model Content

[0005] The utility model aims to provide an air preheater which is easy to clean, and the air preheater which is easy to clean solves the problem that too many adhered dust particles will affect the heat transfer efficiency.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The smoke exhaust gas fan of the smoke exhaust gas fan is connected with the smoke exhaust gas fan of the smoke exhaust gas fan, and the smoke exhaust gas fan of the smoke exhaust gas fan is connected with the smoke exhaust gas fan of the smoke exhaust gas fan.

[0008] Preferably, a cold air duct is wound around the outer wall of the flue pipe, and the cold air duct is arranged in a spiral shape, and both ends of the cold air duct extend to the outside of the insulation box respectively. By winding the cold air duct around the outer wall of the flue pipe, heat can be transferred through the contact between the metal pipe walls. The spiral arrangement can increase the contact area between the metal pipe walls to improve the efficiency of heat transfer, and the metal material itself has good thermal conductivity.

[0009] Preferably, the cold air duct is fitted with the outer wall of the smoke duct, and the inner wall of the cold air duct is connected with a heat conductive strip. By arranging the heat conductive strip in the cold air duct, the contact area between the inner wall of the cold air duct and the air can be conveniently increased, so as to further improve the efficiency of heat transfer.

[0010] Preferably, one end of the air inlet of the cold air duct is connected to a blower, and the blower is started to continuously deliver air into the cold air duct.

[0011] Preferably, a collecting mechanism is provided at one end of the smoke pipe for exhaust, and the collecting mechanism includes a separation tube, which is connected to one end of the smoke pipe for exhaust. By providing a separation tube with a larger diameter at the end of the smoke pipe for exhaust, the flow velocity of the airflow will be slowed down when it enters the separation tube, so that the heavier dust particles in the smoke lose contact with the tube wall of the separation tube and automatically fall down due to their own weight to achieve separation.

[0012] Preferably, the bottom of the separation tube is connected to a funnel, the outer wall of the separation tube is connected to a support frame, and the inner wall of the support frame is slidably connected to a collection box. By providing a funnel, it is convenient to guide the falling dust particles so that they fall into the collection box for collection, so as to facilitate the later removal of the collection box for centralized processing.

[0013] Preferably, the position where the smoke pipe is connected to the separation tube is tangent to the inner wall of the separation tube. Since the smoke pipe and the separation tube are tangent to each other, the smoke from the smoke pipe will flow along the separation tube after entering the separation tube to form an air flow vortex, and the dust particles in the air flow will contact the inner wall of the separation tube under the action of centrifugal force, thereby losing inertia and falling automatically due to their own action.

[0014] By means of the above technical solution, the utility model provides an air preheater that is easy to clean. It has at least the following beneficial effects:

[0015] 1. The utility model arranges an impeller on the inner wall of the smoke pipe so that when the smoke pipe is connected to the smoke, the airflow formed will drive the impeller to rotate. When the impeller rotates, the connecting rod drives the scraper to rotate together, so as to facilitate the scraping of dust particles adhered to the inner wall of the smoke pipe by the rotation of the scraper, so as to avoid the problem that too many adhered dust particles will affect the heat transfer efficiency. The heat generated by the friction between the scraper and the inner wall of the smoke pipe when the scraper rotates and scrapes can increase the heat of the pipe wall of the smoke pipe, so as to improve the heating efficiency.

[0016] 2. The utility model sets a separation tube with a larger diameter at one end of the smoke pipe for exhaust, so that the flow rate of the airflow will be slowed down when it enters the separation tube, so that the heavier dust particles in the smoke lose contact with the wall of the separation tube and automatically fall down due to their own weight to achieve separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application:

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a partial cross-sectional view of the utility model;

[0020] Figure 3 For the utility model Figure 2 A magnified view;

[0021] Figure 4 It is a partial cross-sectional view of the smoke pipe in the utility model.

[0022] In the figure: 1. Insulation box; 2. Smoke pipe; 3. Cold air pipe; 31. Heat transfer strip; 4. Blower; 5. Collecting mechanism; 51. Separation pipe; 52. Funnel; 53. Support frame; 54. Collecting box; 6. Cleaning mechanism; 61. Connecting ring; 62. Scraper strip; 63. Connecting rod; 64. Impeller. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Example 1

[0025] An air preheater that is easy to clean, such as Figure 1-Figure 4 As shown, it includes an insulated box 1, the inner wall of the insulated box 1 is connected to a flue gas pipe 2, and the two ends of the flue gas pipe 2 extend to the outside of the insulated box 1 respectively, and a cleaning mechanism 6 is arranged inside the flue gas pipe 2, and the cleaning mechanism 6 includes a connecting ring 61, and the connecting ring 61 is rotatably connected to one end of the flue gas pipe 2, and a scraper 62 is connected to the surface of the connecting ring 61, and the scraper 62 extends to the inside of the flue gas pipe 2, and the scraper 62 is slidably connected to the inner wall of the flue gas pipe 2, and an impeller 64 is arranged on the inner wall of the flue gas pipe 2, and the impeller 64 is connected to the scraper 62 through a connecting rod 63. By arranging the impeller 64 on the inner wall of the flue gas pipe 2, when the flue gas pipe 2 is connected to the flue gas, the airflow formed will drive the impeller 64 to rotate, and when the impeller 64 rotates, the scraper 62 is driven to rotate together through the connecting rod 63, so as to facilitate the scraping of dust particles adhered to the inner wall of the flue gas pipe 2 by the rotation of the scraper 62, so as to avoid the problem that too many adhered dust particles will affect the heat transfer efficiency, and the scraper The heat generated by the friction with the inner wall of the flue gas pipe 2 during the rotation and scraping 62 can increase the heat of the pipe wall of the flue gas pipe 2 to improve the heating efficiency. A cold air pipe 3 is wound around the outer wall of the flue gas pipe 2, and the cold air pipe 3 is spirally arranged. Both ends of the cold air pipe 3 extend to the outside of the insulation box 1 respectively. The cold air pipe 3 is wound around the outer wall of the flue gas pipe 2, so that heat can be transferred through the contact between the metal pipe walls. The spiral arrangement can increase the contact area between the metal pipe walls to improve the efficiency of heat transfer, and the metal material itself has good thermal conductivity. The cold air pipe 3 is fitted with the outer wall of the flue gas pipe 2, and the inner wall of the cold air pipe 3 is connected to a heat conducting strip 31. By arranging the heat conducting strip 31 on the cold air pipe 3, the contact area between the inner wall of the cold air pipe 3 and the air can be conveniently increased to further improve the efficiency of heat transfer. One end of the air inlet of the cold air pipe 3 is connected to a blower 4, and air is continuously delivered to the cold air pipe 3 by starting the blower 4.

[0026] In this embodiment, when the flue gas pipe 2 is connected to the flue gas, the airflow formed will drive the impeller 64 to rotate. When the impeller 64 rotates, the connecting rod 63 drives the scraper 62 to rotate together, so as to facilitate the scraping of dust particles adhered to the inner wall of the flue gas pipe 2 by the rotation of the scraper 62, so as to avoid the problem that too many adhered dust particles will affect the heat transfer efficiency. The heat generated by the friction between the scraper 62 and the inner wall of the flue gas pipe 2 when the scraper 62 rotates and scrapes can increase the heat of the pipe wall of the flue gas pipe 2 to improve the heating efficiency. By starting the blower 4 to continuously transport air into the cold air pipe 3, by winding the cold air pipe 3 around the outer wall of the flue gas pipe 2, heat can be transferred through the contact between the metal pipe walls. The spiral arrangement can increase the contact area between the metal pipe walls to improve the efficiency of heat transfer. The metal material itself has good thermal conductivity. By setting the thermal conductive strip 31 in the cold air pipe 3, the contact area between the inner wall of the cold air pipe 3 and the air can be conveniently increased to further improve the efficiency of heat transfer.

[0027] Example 2

[0028] like Figure 2 As shown, a collecting mechanism 5 is provided at one end of the exhaust of the smoke pipe 2, and the collecting mechanism 5 includes a separation pipe 51, and the separation pipe 51 is connected to one end of the exhaust of the smoke pipe 2. By providing a separation pipe 51 with a larger diameter at one end of the exhaust of the smoke pipe 2, the flow rate of the airflow will be slowed down when it enters the separation pipe 51, so that the heavier dust particles in the smoke lose contact with the wall of the separation pipe 51 after contacting the wall of the separation pipe 51, and automatically fall down due to their own weight to achieve separation. The bottom of the separation pipe 51 is connected to a funnel 52, and the outer wall of the separation pipe 51 is connected to a support frame 53, and the inner wall of the support frame 53 is slidably connected to a collection box 54. The funnel 52 is provided to guide the falling dust particles so that they fall into the collection box 54 for collection, so as to facilitate the later extraction of the collection box 54 for centralized treatment. The position where the smoke pipe 2 is connected to the separation tube 51 is tangent to the inner wall of the separation tube 51. Since the position relationship between the smoke pipe 2 and the separation tube 51 is tangent, the smoke of the smoke pipe 2 will flow along the separation tube 51 after entering the separation tube 51, forming an air flow vortex, and the dust particles in the air flow will contact the inner wall of the separation tube 51 under the action of centrifugal force, thereby losing inertia and automatically falling due to their own action.

[0029] In this embodiment, a separation tube 51 with a larger diameter is provided at one end of the smoke pipe 2 for exhaust, so that the flow velocity will be slowed down when the airflow enters the separation tube 51, and because the position relationship between the smoke pipe 2 and the separation tube 51 is tangential, the smoke from the smoke pipe 2 will flow along after entering the separation tube 51 to form an airflow vortex, and the dust particles in the airflow will contact the inner wall of the separation tube 51 under the action of centrifugal force, thereby losing inertia and automatically falling due to their own action. The funnel 52 is provided to guide the falling dust particles so that they fall into the collection box 54 for collection, so as to facilitate the later extraction of the collection box 54 for centralized treatment.

[0030] When the utility model is an air preheater which is easy to clean, when the flue gas pipe 2 is connected to the flue gas, the airflow formed will drive the impeller 64 to rotate. When the impeller 64 rotates, the connecting rod 63 drives the scraper 62 to rotate together, so as to facilitate the scraping of dust particles adhering to the inner wall of the flue gas pipe 2 by the rotation of the scraper 62, so as to avoid the problem that too many adhering dust particles will affect the heat transfer efficiency. The heat generated by the friction between the scraper 62 and the inner wall of the flue gas pipe 2 when the scraper 62 rotates and scrapes can increase the heat of the pipe wall of the flue gas pipe 2 to improve the heating efficiency. By starting the blower 4 to continuously transport air into the cold air pipe 3, by winding the cold air pipe 3 around the outer wall of the flue gas pipe 2, heat can be transferred through the contact between the metal pipe walls. The spiral arrangement can increase the contact area between the metal pipe walls to improve the heat transfer efficiency, and the metal The metal material itself has good thermal conductivity, and by setting a heat-conducting strip 31 in the cold air duct 3, the contact area between the inner wall of the cold air duct 3 and the air can be conveniently increased, so as to further improve the efficiency of heat transfer. By setting a separation tube 51 with a larger diameter at the exhaust end of the smoke duct 2, the flow rate of the airflow will be slowed down when entering the separation tube 51, and since the position relationship between the smoke duct 2 and the separation tube 51 is tangential, the smoke of the smoke duct 2 will flow along after entering the separation tube 51 to form an air flow vortex, and the dust particles in the airflow will contact the inner wall of the separation tube 51 under the action of centrifugal force, thereby losing inertia and automatically falling due to their own action. By setting a funnel 52, the falling dust particles can be conveniently guided to fall into the collection box 54 for collection, so as to facilitate the later extraction of the collection box 54 for centralized treatment.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An air preheater that is easy to clean, comprising an insulation box (1), characterized in that: The inner wall of the heat preservation box (1) is connected to a smoke pipe (2), and both ends of the smoke pipe (2) extend to the outside of the heat preservation box (1) respectively. A cleaning mechanism (6) is arranged inside the smoke pipe (2), and the cleaning mechanism (6) comprises a connecting ring (61), and the connecting ring (61) is rotatably connected to one end of the smoke pipe (2). A scraper (62) is connected to the surface of the connecting ring (61), and the scraper (62) extends to the inside of the smoke pipe (2), and the scraper (62) is slidably connected to the inner wall of the smoke pipe (2). The inner wall of the smoke pipe (2) is provided with an impeller (64), and the impeller (64) is connected to the scraper (62) via a connecting rod (63).

2. The easy-to-clean air preheater according to claim 1, characterized in that: A cold air pipe (3) is arranged around the outer wall of the smoke pipe (2), and the cold air pipe (3) is arranged in a spiral shape, with both ends of the cold air pipe (3) extending to the outside of the heat preservation box (1) respectively.

3. The easy-to-clean air preheater according to claim 2, characterized in that: The cold air pipe (3) is fitted to the outer wall of the smoke pipe (2), and the inner wall of the cold air pipe (3) is connected to a heat conducting strip (31).

4. The easy-to-clean air preheater according to claim 2, characterized in that: One air inlet end of the cold air pipe (3) is connected to a blower (4).

5. The easy-to-clean air preheater according to claim 1, characterized in that: A collecting mechanism (5) is provided at one end of the exhaust gas pipe (2), and the collecting mechanism (5) comprises a separation pipe (51), and the separation pipe (51) is connected to one end of the exhaust gas pipe (2).

6. The easy-to-clean air preheater according to claim 5, characterized in that: The bottom of the separation tube (51) is connected to a funnel (52), the outer wall of the separation tube (51) is connected to a support frame (53), and the inner wall of the support frame (53) is slidably connected to a collection box (54).

7. The easy-to-clean air preheater according to claim 5, characterized in that: At the position where the smoke pipe (2) is connected to the separation pipe (51), the inner walls of the smoke pipe (2) and the separation pipe (51) are tangent.

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