Air preheater with high conversion efficiency

Abstract

The utility model relates to the technical field of air preheaters, in particular to an air preheater with high conversion efficiency, which comprises a box body, a supporting rod is connected to the inner wall of the box body, a cold air pipe and a smoke pipe are wound on the outer wall of the supporting rod, the cold air pipe and the smoke pipe are mutually attached and are spirally arranged, a heat conduction strip is connected to the inner wall of the cold air pipe, and the heat conduction strip is connected with a heat exchange tube. The metal pipe wall of the smoke pipe is heated through heat of smoke introduced into the smoke pipe, the heat is transferred to the metal pipe wall of the cold air pipe through the metal pipe wall of the smoke pipe, the heat can be rapidly exchanged through the good heat conduction performance of metal materials, and therefore the purpose of heating air in the cold air pipe is achieved. And through the heat conduction strips extending from the inner wall of the cold air pipe, air in the middle of the cold air pipe and air in the inner wall of the cold air pipe can be heated at the same time, so that the heat transfer efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air preheaters, in particular to an air preheater with high conversion efficiency. 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 exhaust 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 exchanges more heat in the same time. However, when the spiral air duct is heated, only the cold air at the wall of the tube is heated first, and the air at the center of the tube body is heated by the added hot air, resulting in a low heating efficiency for the air at the center of the tube body. In view of this, we propose an air preheater with high conversion efficiency. Utility Model Content

[0005] The utility model aims to provide an air preheater with high conversion efficiency, which solves the problem of low heating efficiency for air at the center of a tube body.

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

[0007] An air preheater with high conversion efficiency comprises a box body, the inner wall of the box body is connected to a support rod, the outer wall of the support rod is wound with a cold air duct and a smoke pipe, and the cold air duct and the smoke pipe fit each other and are arranged in a spiral shape, the inner wall of the cold air duct is connected to a heat conductive strip, the heat of the smoke connected through the smoke pipe is used to heat the metal pipe wall of the smoke pipe, the heat is transferred to the metal pipe wall of the cold air duct through the metal pipe wall of the smoke pipe, the good thermal conductivity of the metal material itself allows the heat to be exchanged quickly, thereby achieving the purpose of heating the air inside the cold air duct, and the heat conductive strip extending through the inner wall of the cold air duct allows the air in the middle of the cold air duct and the air on the inner wall of the cold air duct to be heated at the same time, so as to improve the efficiency of heat transfer.

[0008] Preferably, a thermal arc is connected to the top of the thermally conductive strip, and the cross-section of the thermally conductive arc is semicircular. By providing the thermally conductive arc, the contact area between the thermally conductive strip and the air inside the cold air duct can be increased, thereby further improving the efficiency of heat transfer.

[0009] Preferably, the inner wall of the box is connected to a ceramic plate, and the ceramic plates are arranged in an up-and-down staggered manner. The inner wall of the box is filled with thermal insulation sponge. The internal space of the box is filled with ceramic plates. Since the ceramic material has good heat storage capacity, some heat emitted by the flue pipe can be well stored. Moreover, since the heat transfer efficiency of the ceramic material itself is low, it will not absorb a large amount of heat when heating the cold air pipe, causing heat dispersion problems.

[0010] Preferably, a gap is provided on the inner wall of the ceramic plate, and the support rod passes through a position between the ceramic plate and the inner wall of the box body in an up-and-down undulating manner.

[0011] Preferably, both ends of the cold air duct and the smoke duct extend to the outside of the box respectively, and a blower is connected to the right side of the outer wall of the box, the air outlet of the blower is connected to one end of the cold air duct, and the other end of the cold air duct is connected to a preheating gas connector. The blower is started to continuously blow in cold air for heating, and then discharged from the preheating gas connector after heating.

[0012] Preferably, one end of the smoke pipe is connected to a smoke inlet joint, and the other end of the smoke pipe is connected to a smoke outlet joint, and the smoke is introduced through the smoke inlet joint and discharged from the smoke outlet joint through the smoke pipe.

[0013] Preferably, the smoke pipe is connected to a solenoid valve at the smoke inlet joint, and the flow of smoke is controlled by the solenoid valve. The cold air pipe is connected to a thermometer at the preheating gas joint, and the final temperature of the preheating gas is detected by the thermometer.

[0014] By means of the above technical solution, the utility model provides an air preheater with high conversion efficiency. It has at least the following beneficial effects:

[0015] 1. The utility model heats the metal tube wall of the smoke tube by the heat of the smoke connected to the smoke tube, and transfers the heat to the metal tube wall of the cold air tube through the metal tube wall of the smoke tube. The good thermal conductivity of the metal material itself allows the heat to be quickly exchanged, thereby achieving the purpose of heating the air inside the cold air tube, and the heat conductive strip extending from the inner wall of the cold air tube allows the air in the middle of the cold air tube and the air on the inner wall of the cold air tube to be heated at the same time, thereby improving the efficiency of heat transfer.

[0016] 2. The utility model arranges ceramic plates to fill the internal space of the box. Since the ceramic material has good heat storage capacity, it can well store some of the heat emitted by the smoke pipe. Moreover, since the heat transfer efficiency of the ceramic material itself is low, it will not absorb a large amount of heat when heating the cold air pipe, causing the problem of heat dispersion. 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 partial cross-sectional view of the utility model;

[0019] Figure 2 For the utility model Figure 1 A magnified view of A;

[0020] Figure 3 For the utility model Figure 1 Enlarged view of B;

[0021] Figure 4 It is a cross-sectional schematic diagram of the intercooler air duct and the heat conducting ring of the utility model.

[0022] In the figure: 1. box body; 11. thermal insulation sponge; 2. ceramic plate; 21. gap; 3. support rod; 41. cold air duct; 411. thermal conductive strip; 412. thermal conductive arc; 42. flue gas pipe; 5. flue gas inlet connector; 51. flue gas outlet connector; 6. solenoid valve; 7. blower; 8. thermometer; 9. preheating gas connector. 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 with high conversion efficiency, such as Figure 1 - Figure 4 As shown, it includes a box body 1, the inner wall of the box body 1 is connected to a support rod 3, the outer wall of the support rod 3 is surrounded by a cold air duct 41 and a smoke pipe 42, and the cold air duct 41 and the smoke pipe 42 fit each other and are arranged in a spiral shape, and the inner wall of the cold air duct 41 is connected to a heat conductive strip 411, and the heat of the smoke connected to the smoke pipe 42 is used to heat the metal pipe wall of the smoke pipe 42, and the heat is transferred to the metal pipe wall of the cold air duct 41 through the metal pipe wall of the smoke pipe 42. The good thermal conductivity of the metal material itself allows the heat to be quickly exchanged, so as to achieve the purpose of heating the air inside the cold air duct 41, and the heat conductive strip 411 extending through the inner wall of the cold air duct 41 allows the air at the middle of the cold air duct 41 and the air at the inner wall of the cold air duct 41 to be heated at the same time, so as to improve the efficiency of heat transfer, and the heat conductive strip 411 A heat-conducting arc 412 is connected to the top, and the cross-section of the heat-conducting arc 412 is semicircular. By setting the heat-conducting arc 412, the contact area between the heat-conducting strip 411 and the air inside the cold air duct 41 can be increased, so as to further improve the efficiency of heat transfer. The inner wall of the box body 1 is connected to a ceramic plate 2, and the ceramic plates 2 are staggered up and down. The inner wall of the box body 1 is filled with a thermal insulation sponge 11. The internal space of the box body 1 is filled by setting the ceramic plate 2. Since the ceramic material has good heat storage capacity, some heat emitted by the flue gas pipe 42 can be well stored. Since the heat transfer efficiency of the ceramic material itself is low, it will not absorb a large amount of heat when the cold air duct 41 is heated, resulting in heat dispersion problems. A gap 21 is opened on the inner wall of the ceramic plate 2, and the support rod 3 passes through the position between the ceramic plate 2 and the inner wall of the box body 1 in an up and down shape.

[0026] In this embodiment, the heat of the flue gas connected to the flue pipe 42 is used to heat the metal tube wall of the flue pipe 42, and the heat is transferred to the metal tube wall of the cold air pipe 41 through the metal tube wall of the flue pipe 42. The good thermal conductivity of the metal material itself allows heat to be exchanged quickly, thereby achieving the purpose of heating the air inside the cold air pipe 41, and the heat-conducting strip 411 extending through the inner wall of the cold air pipe 41 allows the air in the middle of the cold air pipe 41 and the air on the inner wall of the cold air pipe 41 to be heated at the same time to improve the efficiency of heat transfer. By setting the heat-conducting arc 412, the contact area between the heat-conducting strip 411 and the air inside the cold air pipe 41 can be increased, thereby further improving the efficiency of heat transfer. By setting the ceramic plate 2 to fill the internal space of the box body 1, due to the good heat storage capacity of the ceramic material, some of the heat emitted from the flue pipe 42 can be well stored, and due to the low heat transfer efficiency of the ceramic material itself, it will not absorb a large amount of heat when heating the cold air pipe 41, resulting in heat dispersion problems.

[0027] Example 2

[0028] like Figure 2 , Figure 3 As shown, both ends of the cold air duct 41 and the smoke pipe 42 extend to the outside of the box body 1 respectively, and a blower 7 is connected to the right side of the outer wall of the box body 1, and the air outlet of the blower 7 is connected to one end of the cold air duct 41, and the other end of the cold air duct 41 is connected to a preheating gas connector 9. By starting the blower 7, cold air is continuously blown in for heating, and then discharged from the preheating gas connector 9 after heating. One end of the smoke pipe 42 is connected to a smoke inlet connector 5, and the other end of the smoke pipe 42 is connected to a smoke outlet connector 51. The smoke is connected through the smoke inlet connector 5 and discharged from the smoke outlet connector 51 through the smoke pipe 42. The smoke pipe 42 is connected to a solenoid valve 6 at the position of the smoke inlet connector 5, and the flow rate of the smoke is controlled by the solenoid valve 6. The cold air duct 41 is connected to a thermometer 8 at the position of the preheating gas connector 9, and the final temperature of the preheated gas is detected by the thermometer 8.

[0029] In this embodiment, the blower 7 is started to continuously blow in cold air for heating, which is then discharged from the preheating gas connector 9. The final temperature of the preheating gas is detected and observed by the thermometer 8. The flue gas is connected through the flue gas inlet connector 5 and discharged from the flue gas outlet connector 51 through the flue gas pipe 42. The flow rate of the flue gas is controlled by the solenoid valve 6.

[0030] The utility model is an air preheater with high conversion efficiency. When in use, the blower 7 is started to continuously blow in cold air for heating, and the cold air is discharged from the preheating gas joint 9 after heating. The final temperature of the preheating gas is detected and observed by the thermometer 8. The flue gas is connected through the flue gas inlet joint 5 and discharged from the flue gas outlet joint 51 through the flue gas pipe 42. The flow rate of the flue gas is controlled by the solenoid valve 6. The heat of the flue gas connected through the flue gas pipe 42 is used to heat the metal pipe wall of the flue gas pipe 42. The heat is transferred to the metal pipe wall of the cold air pipe 41 through the metal pipe wall of the flue gas pipe 42. The good thermal conductivity of the metal material itself allows the heat to be quickly exchanged, thereby achieving the purpose of heating the air inside the cold air pipe 41. For the purpose of heat, the heat-conducting strip 411 extending through the inner wall of the cold air duct 41 allows the air in the middle of the cold air duct 41 and the air on the inner wall of the cold air duct 41 to be heated at the same time to improve the efficiency of heat transfer. The heat-conducting arc 412 can be provided to increase the contact area between the heat-conducting strip 411 and the air inside the cold air duct 41, thereby further improving the efficiency of heat transfer. The internal space of the box body 1 is filled with a ceramic plate 2. Since the ceramic material has good heat storage capacity, it can store some of the heat emitted by the smoke pipe 42 well. Moreover, since the ceramic material itself has low heat transfer efficiency, it will not absorb a large amount of heat when the cold air duct 41 is heated, resulting in a problem of heat dispersion.

[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 with high conversion efficiency, comprising a housing (1), characterized in that: The inner wall of the box body (1) is connected to a support rod (3), and a cold air pipe (41) and a smoke pipe (42) are arranged around the outer wall of the support rod (3). The cold air pipe (41) and the smoke pipe (42) fit each other and are arranged in a spiral shape. The inner wall of the cold air pipe (41) is connected to a heat conducting strip (411).

2. The air preheater with high conversion efficiency according to claim 1, characterized in that: The top of the heat-conducting strip (411) is connected to a heat-conducting arc (412), and the cross-section of the heat-conducting arc (412) is semicircular.

3. The air preheater with high conversion efficiency according to claim 1, characterized in that: The inner wall of the box body (1) is connected to a ceramic plate (2), and the ceramic plates (2) are arranged in an up-and-down staggered manner. The inner wall of the box body (1) is filled with a thermal insulation sponge (11).

4. The air preheater with high conversion efficiency according to claim 3 is characterized in that: The inner wall of the ceramic plate (2) is provided with a gap (21), and the support rod (3) passes through the position between the ceramic plate (2) and the inner wall of the box body (1) in an up-and-down manner.

5. The air preheater with high conversion efficiency according to claim 1, characterized in that: Both ends of the cold air pipe (41) and the smoke pipe (42) extend to the outside of the box (1) respectively; a blower (7) is connected to the right side of the outer wall of the box (1); an air outlet of the blower (7) is connected to one end of the cold air pipe (41); and the other end of the cold air pipe (41) is connected to a preheating gas connector (9).

6. The air preheater with high conversion efficiency according to claim 5, characterized in that: One end of the smoke pipe (42) is connected to a smoke inlet connector (5), and the other end of the smoke pipe (42) is connected to a smoke outlet connector (51).

7. The air preheater with high conversion efficiency according to claim 6, characterized in that: The smoke pipe (42) is connected to a solenoid valve (6) at the position of the smoke inlet joint (5), and the cold air pipe (41) is connected to a thermometer (8) at the position of the preheating gas joint (9).

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