Efficient air heat exchanger and boiler

Abstract

The utility model provides an efficient air heat exchanger and a boiler, the efficient air heat exchanger comprises a rack, a baffle and a plurality of air heat exchange units, the baffle is fixedly installed on the rack and surrounds the rack to form a heat exchange channel, high-temperature flue gas passes through the heat exchange channel, and the air heat exchange units are installed in the heat exchange channel. Each air heat exchange unit comprises a vertically-arranged communicating pipe and a plurality of air heat exchange modules, each module is composed of a first collecting box, a second collecting box and a plurality of air heat exchange pipes, the communicating pipes are connected with the first collecting boxes and the second collecting boxes of the adjacent modules, and the two ends of each heat exchange pipe are communicated with the first collecting boxes and the second collecting boxes correspondingly. And the second collecting box is positioned above the first collecting box. Air enters from the first collecting box at the bottommost layer, enters the adjacent second collecting box through the heat exchange pipe, then enters the upper layer module layer by layer through the communicating pipe, and is exhausted from the second collecting box at the uppermost layer. The collecting boxes and the multiple air heat exchange pipes are installed on the rack in a classified and integrated mode, a modular design structure is provided, and the assembling efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler technical field especially relates to a kind of high-efficiency air heat exchanger and boiler. BACKGROUND

[0002] Boiler is a kind of energy conversion equipment, by burning fuel or using electric energy, nuclear energy and other energy, water or other medium is heated into steam or hot water, widely used in industrial production, life heating and power generation etc.

[0003] Air heat exchanger can be directly installed on the boiler, as important component of boiler system, for recycling waste heat in boiler flue gas, improve boiler efficiency, however, existing air heat exchanger usually adopts straight flow or simple cross flow design, due to single air flow path, the contact time between fluid is short, leading to heat exchange efficiency cannot meet the efficient heat exchange demand.

[0004] In addition, the components of traditional air heat exchanger need to carry out a large number of field assembly and debugging when installing, both increase construction difficulty, also lengthen installation cycle, and lead to equipment installation occupies large area, hoisting is difficult, overall construction efficiency is lower, which further influences the operation stability and economy of boiler system. SUMMARY

[0005] The purpose of the present application is to provide a kind of high-efficiency air heat exchanger, to solve the problem of low assembly efficiency of air heat exchanger of boiler in prior art;In addition, the present application also provides a kind of boiler containing high-efficiency air heat exchanger.

[0006] To achieve this purpose, the following technical solutions are adopted in the present application:

[0007] The present application provides a kind of high-efficiency air heat exchanger, it includes rack, baffle and several air heat exchange units, wherein:

[0008] Baffle is fixedly installed on rack, baffle surrounds rack to form heat exchange channel, high-temperature flue gas passes through heat exchange channel, air heat exchange unit is installed on one side of rack;

[0009] Each air heat exchange unit includes communication pipe arranged along vertical direction and several air heat exchange modules, each air heat exchange module includes first header, second header and multiple air heat exchange pipes, communication pipe connects the first header and the second header of adjacent air heat exchange module, air heat exchange pipe is communicated with first header and second header at both ends respectively, second header is located above first header, the first header of the lowermost layer is provided with air inlet end, the second header of the uppermost layer is provided with air outlet end;

[0010] Air enters the first header through the air inlet end, enters the second header through the air heat exchange pipe, enters the upper air heat exchange module in turn through the communication pipe, and is discharged through the air outlet end. The high-temperature flue gas in the heat exchange channel contacts the plurality of air heat exchange pipes to exchange heat with the air in the pipes.

[0011] Optionally, the air heat exchange pipe is located in the heat exchange channel, the first header and the second header are installed on the outer wall of the baffle, the air heat exchange pipe includes an air inlet pipe, an air outlet pipe and a U-shaped pipe, the first end of the air inlet pipe penetrates through the baffle and is in communication with the first header, the first end of the air outlet pipe penetrates through the baffle and is in communication with the second header, and the U-shaped pipe is in communication with the second end of the air inlet pipe and the second end of the air outlet pipe.

[0012] Optionally, the air inlet pipe and the air outlet pipe are arranged horizontally along the first direction, and the lengths of the U-shaped pipes located in the same vertical direction along the first direction are different, so that the air heat exchange pipes located in the same vertical direction along the first direction form a pipe row.

[0013] Optionally, the air heat exchange module is provided with a plurality of pipe rows along the second direction.

[0014] Optionally, the high-temperature flue gas flows in the heat exchange channel along the vertical direction from top to bottom.

[0015] Optionally, the inner wall of the baffle is fixedly connected with a heat preservation plate, and the heat preservation plate is configured to preserve heat for the side wall of the heat exchange channel.

[0016] Optionally, the baffle is provided in the form of an expanded tube structure.

[0017] Optionally, a reinforcing member is arranged in the rack, and the reinforcing member is configured to enhance the strength of the rack.

[0018] Optionally, the high-efficiency air heat exchanger further comprises a hoisting member fixedly connected with the rack, and the hoisting member is configured to be connected with external hoisting equipment to place the high-efficiency air heat exchanger.

[0019] A boiler comprising the high-efficiency air heat exchanger of any one of the above.

[0020] Compared with the prior art, the high-efficiency air heat exchanger has the following advantages:

[0021] 1) Through the cooperation between the header and the air heat exchange pipe, a modular installation structure is provided, the complexity and time of on-site installation are reduced, the assembly efficiency of the equipment is effectively improved, and through the cooperation of the communication pipe and the air heat exchange module, the air in the pipeline is in heat exchange with the high-temperature flue gas multiple times, which ensures the heat exchange effect and improves the heat exchange efficiency of the equipment.

[0022] 2) By adopting the high-temperature flue gas counterflow heat exchange mode, the residence time of the high-temperature flue gas in the heat exchange channel is increased, the waste heat resource of the flue gas is fully utilized, and the heat exchange efficiency is improved.

[0023] 3) By setting the air inlet pipe and the air outlet pipe horizontally and forming the pipe row by adjusting the length of the U-shaped pipe, the space utilization in the heat exchange channel is improved, the installation and adjustment workload is reduced, and the consistency and efficiency of assembly are improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate and understand the technical solutions in the embodiments of the present application, the drawings needed to be used in the background and the embodiment description of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by the person skilled in the art without creative labor on the basis of the content of the embodiments of the present application and the drawings.

[0025] Figure 1 is the internal front view of the high-efficiency air heat exchanger provided by the embodiments of the present application;

[0026] Figure 2 is the top view of the high-efficiency air heat exchanger provided by the embodiments of the present application;

[0027] Figure 3 is Figure 1 the enlarged schematic view of A in FIG. 1;

[0028] Figure 4 is Figure 2 the enlarged schematic view of B in FIG. 1. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the related drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized 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 thorough and comprehensive. It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or there can be a middle component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as understood by those skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] Please refer to Figures 1 to 4As shown, the high-efficiency air heat exchanger provided by the embodiment of the present application comprises a rack 10, a baffle 20 and a plurality of air heat exchange units 30, wherein:

[0031] The baffle 20 is fixedly installed on the rack 10, the baffle 20 surrounds the rack 10 to form a heat exchange channel 40, the high-temperature flue gas passes through the heat exchange channel 40, and the air heat exchange unit 30 is installed on one side of the rack 10;

[0032] Each air heat exchange unit 30 comprises a communication pipe 31 arranged in a vertical direction and a plurality of air heat exchange modules 32, each air heat exchange module 32 comprises a first header 320, a second header 321 and a plurality of air heat exchange pipes 322, the communication pipe 31 communicates the first header 320 and the second header 321 of adjacent air heat exchange modules 32, the two ends of the air heat exchange pipe 322 are communicated with the first header 320 and the second header 321 respectively, the second header 321 is located above the first header 320, the lowermost first header 320 is provided with an air inlet end 33, and the uppermost second header 321 is provided with an air outlet end 34;

[0033] Air enters the first header 320 from the air inlet end 33, enters the second header 321 through the air heat exchange pipe 322, enters the upper air heat exchange module 32 in sequence through the communication pipe 31, and is discharged from the air outlet end 34, and the high-temperature flue gas in the heat exchange channel 40 contacts the plurality of air heat exchange pipes 322 to exchange heat with the air in the pipes.

[0034] Through the cooperation between the header and the air heat exchange pipe 322, a modular installation structure is provided, the on-site installation complexity and time are reduced, the assembly efficiency of the equipment is effectively improved, and through the cooperation of the communication pipe 31 and the air heat exchange module 32, the air in the pipeline is repeatedly subjected to heat exchange work with the high-temperature flue gas, so that the heat exchange effect is ensured and the heat exchange efficiency of the equipment is improved.

[0035] In an embodiment, the air heat exchange pipe 322 is located in the heat exchange channel 40, the first header 320 and the second header 321 are installed on the outer wall of the baffle 20, the air heat exchange pipe 322 comprises an air inlet pipe 3220, an air outlet pipe 3221 and a U-shaped pipe 3222, the first end of the air inlet pipe 3220 penetrates through the baffle 20 and is communicated with the first header 320, the first end of the air outlet pipe 3221 penetrates through the baffle 20 and is communicated with the second header 321, and the U-shaped pipe 3222 communicates the second end of the air inlet pipe 3220 with the second end of the air outlet pipe 3221.

[0036] By adopting the U-shaped pipe 3222 to communicate the air inlet pipe 3220 and the air outlet pipe 3221, not only the internal connection design of the air heat exchange pipeline is simplified, but also the on-site processing steps are reduced, and rapid installation is facilitated.

[0037] In an embodiment, the air inlet pipe 3220 and the air outlet pipe 3221 are horizontally arranged along a first direction (X direction), and the U-shaped pipes 3222 arranged along the same vertical direction in the first direction have different lengths, so that the air heat exchange pipes 322 arranged along the same vertical direction in the first direction form a pipe row. Figure 1 In an embodiment, the air inlet pipe 3220 and the air outlet pipe 3221 are horizontally arranged along a first direction (X direction), and the U-shaped pipes 3222 arranged along the same vertical direction in the first direction have different lengths, so that the air heat exchange pipes 322 arranged along the same vertical direction in the first direction form a pipe row.

[0038] By horizontally arranging the air inlet pipe 3220 and the air outlet pipe 3221, and forming a pipe row by adjusting the lengths of the U-shaped pipes 3222, the space utilization rate in the heat exchange channel 40 is improved, the installation and adjustment workload is reduced, and the consistency and efficiency of assembly are improved.

[0039] In an embodiment, the air heat exchange module 32 is provided with a plurality of pipe rows along a second direction (Y direction). Figure 2

[0040] By arranging the pipe rows of the air heat exchange module 32 along the second direction, the heat exchange area and the heat exchange capacity are further increased, the modular design is simplified, and the later maintenance and expansion are facilitated.

[0041] In an embodiment, the high-temperature flue gas flows in the heat exchange channel 40 along the vertical direction from top to bottom.

[0042] By adopting the high-temperature flue gas counterflow heat exchange mode, the residence time of the high-temperature flue gas in the heat exchange channel 40 is increased, the waste heat resource of the flue gas is fully utilized, and the heat exchange efficiency is improved.

[0043] In an embodiment, the inner wall of the baffle 20 is fixedly connected with a heat preservation plate 21, and the heat preservation plate 21 is configured to preserve heat for the side wall of the heat exchange channel 40.

[0044] By fixedly connecting the heat preservation plate 21 to the inner wall of the baffle 20, the side wall of the heat exchange channel 40 is heat-preserved, the heat loss to the outside is reduced, the heat energy utilization rate is improved, the external structure of the equipment is protected from high-temperature damage, and the service life is prolonged.

[0045] In an embodiment, the baffle 20 is provided in the form of an expanded pipe structure.

[0046] By providing the baffle 20 in the form of an expanded pipe structure, the connection strength of the air heat exchange pipe 322 and the baffle 20 is improved, the loosening or leakage caused by thermal expansion and cold contraction is prevented, and the sealing performance and safety of the equipment are enhanced.

[0047] In an embodiment, a reinforcing member 22 is arranged in the rack 10, and the reinforcing member 22 is configured to enhance the strength of the rack 10.

[0048] Specifically, the reinforcing member 22 is provided in the form of a flat steel.

[0049] ​By setting the reinforcing member 22 in the rack 10, the anti-deformation ability of the whole structure of the equipment is enhanced, the durability of the equipment is improved, and the stability and safety of the equipment when the high-temperature flue gas flows are ensured.

[0050] In an embodiment, the high-efficiency air heat exchanger further comprises a hoisting member 50 fixedly connected with the rack 10, and the hoisting member 50 is configured to be connected with an external hoisting device to place the high-efficiency air heat exchanger.

[0051] By designing the hoisting member 50 on the heat exchanger and fixedly connecting the hoisting member 50 with the rack 10, the overall hoisting and installation of the equipment are facilitated, the on-site assembly time is reduced, the construction efficiency is improved, and transportation and positioning are facilitated.

[0052] A boiler comprising any of the above high-efficiency air heat exchangers.

[0053] The above embodiments only illustrate the basic principles and characteristics of the present application, and the present application is not limited by the above examples. Various changes and modifications of the present application fall within the scope of the present application without departing from the spirit and scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A high efficiency air heat exchanger characterized by, The high-efficiency air heat exchanger comprises a rack, a baffle and a plurality of air heat exchange units, wherein: The baffle is fixedly installed on the rack, the baffle surrounds the rack to form a heat exchange channel, high-temperature flue gas passes through the heat exchange channel, and the air heat exchange units are installed on one side of the rack; Each air heat exchange unit comprises a communication pipe arranged in a vertical direction and a plurality of air heat exchange modules, each air heat exchange module comprises a first header, a second header and a plurality of air heat exchange pipes, the communication pipe communicates the first header and the second header of adjacent air heat exchange modules, the air heat exchange pipes are in communication with the first header and the second header at both ends respectively, the second header is located above the first header, the lowermost first header is provided with an air inlet end, and the uppermost second header is provided with an air outlet end; Air enters the first header from the air inlet end, enters the second header through the air heat exchange pipes, sequentially enters the upper air heat exchange modules through the communication pipes, and is discharged from the air outlet end, and the high-temperature flue gas in the heat exchange channel contacts the plurality of air heat exchange pipes to exchange heat with the air in the pipes.

2. The high-efficiency air heat exchanger of claim 1, wherein, The air heat exchange pipes are located in the heat exchange channel, the first header and the second header are installed on the outer wall of the baffle, the air heat exchange pipes comprise an air inlet pipe, an air outlet pipe and a U-shaped pipe, the first end of the air inlet pipe penetrates through the baffle and is in communication with the first header, the first end of the air outlet pipe penetrates through the baffle and is in communication with the second header, and the U-shaped pipe communicates the second end of the air inlet pipe and the second end of the air outlet pipe.

3. The high-efficiency air heat exchanger of claim 2, wherein, The air inlet pipe and the air outlet pipe are arranged horizontally along a first direction, the lengths of the U-shaped pipes located in the same vertical direction along the first direction are inconsistent, so that the air heat exchange pipes located in the same vertical direction along the first direction form a pipe row.

4. The high-efficiency air heat exchanger of claim 3, wherein, The air heat exchange modules are provided with a plurality of pipe rows along a second direction.

5. The high-efficiency air heat exchanger of claim 1, wherein, The high-temperature flue gas flows in the heat exchange channel along the vertical direction from top to bottom.

6. The high-efficiency air heat exchanger of claim 1, wherein, The inner wall of the baffle is fixedly connected with an insulation board, and the insulation board is configured to insulate the side wall of the heat exchange channel.

7. The high-efficiency air heat exchanger of claim 1, wherein, The baffle is provided in the form of an expanded tube structure.

8. The high-efficiency air heat exchanger of claim 1, wherein, The rack is provided with a reinforcing member configured to enhance the strength of the rack.

9. The high-efficiency air heat exchanger of claim 1, wherein, The high-efficiency air heat exchanger further comprises a lifting member fixedly connected with the rack, and the lifting member is configured to be connected with external lifting equipment to place the high-efficiency air heat exchanger.

10. A boiler characterized by The boiler comprises the high-efficiency air heat exchanger according to any one of claims 1-9.

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