A boiler structure for realizing waste heat recovery

Abstract

The utility model is suitable for the field of boiler, provide a kind of boiler structure of waste heat recovery, including boiler;Condensing heat exchanger, including first heat exchanger and second heat exchanger;The input end of first heat exchanger is connected the flue gas outlet of boiler, output end connects flue;The input end of second heat exchanger is connected fan, output end connects the combustion chamber of boiler;First heat exchanger includes: shell, inside setting is by the heat exchange pipeline local pipeline and is provided with the fin of heat exchange finned tube of pipeline outside setting;Auxiliary airflow component, including several airflow nozzles and the air pipe of supporting airflow nozzle;Several airflow nozzles are all towards heat exchange finned tube, by this, the utility model can utilize the airflow nozzle on air pipe and spray high-pressure airflow, realize the reversing of flue gas in inclined orientation state, make flue gas change from advection into turbulence, increase the heat exchange time of flue gas, guarantee the sufficiency of heat exchange;The high-pressure airflow can clean the impurity attached to heat exchange finned tube.

Description

Technical Field

[0001] This utility model relates to the field of boilers, and in particular to a boiler structure for realizing waste heat recovery. Background Technology

[0002] Waste heat recovery technology for boilers involves adding a condensing heat exchanger to the tail flue of a traditional boiler to recover heat from the flue gas. Specifically, the condensing heat exchanger is equipped with multiple heat exchange finned tubes, through which a heat exchange medium flows. When the flue gas comes into contact with the heat exchange finned tubes, it transfers heat to the heat exchange medium inside.

[0003] In current condensation heat exchange devices, impurities in the flue gas tend to adhere to the heat exchange finned tubes during use, causing blockage of the gaps between the fins and thus affecting the contact efficiency between the heat exchange finned tubes and the flue gas.

[0004] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0005] To address the aforementioned shortcomings, the purpose of this utility model is to provide a boiler structure for waste heat recovery, which utilizes high-pressure airflow ejected from airflow nozzles mounted on the gas pipe to achieve: The flue gas is diverted by tilting the direction of the flow, changing the flow from advection to turbulence, increasing the heat exchange time of the flue gas, and ensuring sufficient heat exchange. The high-pressure airflow can clean impurities adhering to the heat exchange finned tubes.

[0006] To achieve the above objectives, this utility model provides a boiler structure for waste heat recovery, comprising: a boiler; a condensing heat exchanger, including a first heat exchanger and a second heat exchanger connected by heat exchange pipes; the input end of the first heat exchanger is connected to the flue gas outlet of the boiler, and the output end is connected to the flue; the input end of the second heat exchanger is connected to a fan, and the output end is connected to the combustion chamber of the boiler; the first heat exchanger includes: a shell, the interior of which is provided with heat exchange finned tubes consisting of partial heat exchange pipes and fins on the outside of the pipes; an auxiliary airflow assembly, including a plurality of airflow nozzles located on the side of the heat exchange finned tubes near the input end of the heat exchanger and air pipes supporting the airflow nozzles; the plurality of airflow nozzles are all oriented towards the heat exchange finned tubes; the orientation of the airflow nozzles forms a predetermined angle with the flue gas flow direction.

[0007] According to the boiler structure for waste heat recovery of this utility model, the auxiliary airflow assembly further includes an air inlet disposed on the shell, which is connected to an air pipe through a flexible hose; the air pipe is driven to move along a first direction; the plane of the first direction is parallel to the end plane of the heat exchange finned tube.

[0008] According to the boiler structure for waste heat recovery of this utility model, the gas pipe is a straight pipe; a number of airflow nozzles are distributed along the axis on the side wall of the straight pipe.

[0009] According to the boiler structure for waste heat recovery of this utility model, the orientation of the airflow nozzle can be switched at an angle; before the straight pipe moves, the orientation of the airflow nozzle is at a predetermined angle with the flue gas flow direction; after the straight pipe moves, the orientation of the airflow nozzle is parallel to the flue gas flow direction.

[0010] According to the boiler structure for waste heat recovery of this utility model, a slide rail is provided on the side wall of the shell; sliders are rotatably connected to both ends of the straight pipe; the sliders are slidably installed in the slide rail; a limiting structure is provided between the end of the straight pipe and the slider to limit the rotation angle of the straight pipe; a driving member is installed on the outer wall of the shell, the driving member having a driving end that extends into the interior of the shell and is connected to the straight pipe.

[0011] According to the boiler structure for waste heat recovery of this utility model, the limiting structure includes an arc-shaped limiting groove disposed on the slider and a positioning block that moves along the arc-shaped limiting groove and is connected to the end of the straight pipe; an elastic driving member is connected between the positioning block and the side wall of the arc-shaped limiting groove; when the elastic driving member is not compressed, the orientation of the airflow nozzle is at a predetermined angle with the flue gas flow direction; when the airflow nozzle switches orientations, the elastic driving member is compressed.

[0012] According to the boiler structure for waste heat recovery of this utility model, a winding wheel with a pull wire inside is provided in the middle of the straight pipe; the end of the pull wire is connected to the drive end.

[0013] According to the boiler structure for waste heat recovery of this utility model, the drive end contacts the side wall of the straight pipe during the extension process.

[0014] This utility model provides a boiler structure for waste heat recovery, comprising: a boiler, including a combustion chamber disposed inside the boiler and a flue gas outlet disposed on the outer wall of the boiler and communicating with the combustion chamber; the flue gas released by combustion in the combustion chamber is discharged through the flue gas outlet. A condensing heat exchanger, including a first heat exchanger and a second heat exchanger connected by heat exchange pipes; the input end of the first heat exchanger is connected to the flue gas outlet of the boiler, and the output end is connected to the flue; the input end of the second heat exchanger is connected to a fan, and the output end is connected to the combustion chamber of the boiler; the heat exchange pipes are filled with a heat exchange medium (common heat exchange medium such as water), and the heat exchange medium is driven by a circulating pump to circulate in the heat exchange pipes. The internal spaces of the first heat exchanger and the second heat exchanger are independent to fix the direction of the flue gas and ensure stable discharge of the flue gas; the first heat exchanger and the second heat exchanger are isolated by a partition. The flue gas discharge process is as follows: flue gas is produced from the combustion chamber and discharged through the flue gas outlet into the first heat exchanger. The heat in the flue gas is transferred into the heat exchange pipes through heat exchange, while the flue gas, cooled due to heat loss, is discharged to the outside through the flue. The heat recovery process is as follows: heat flows into the second heat exchanger along with the heat exchange medium. A fan blows out airflow to carry the heat and introduce it into the combustion chamber, thus realizing the heat recovery work.

[0015] This invention utilizes an airflow nozzle mounted on an air pipe to eject high-pressure airflow, achieving the following: 1. By tilting the flue gas in an inclined direction, the flue gas is diverted from laminar flow to turbulent flow, increasing the heat exchange time and ensuring sufficient heat exchange. 2. The high-pressure airflow can clean impurities adhering to the heat exchange finned tubes. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the boiler structure of this utility model; Figure 2 This is a schematic diagram of the external structure of the first heat exchanger of this utility model; Figure 3 This is a schematic diagram of the internal structure of the first heat exchanger of this utility model; Figure 4 This is a schematic diagram of the trachea and its associated structures; Figure 5 This is a state diagram of the airflow nozzle when the drive component is reset; Figure 6 yes Figure 4 Enlarged view of section A; In the diagram, 1-boiler, 11-combustion chamber, 12-flue gas outlet, 2-condensing heat exchanger, 21-first heat exchanger, 22-second heat exchanger, 3-shell, 4-heat exchange finned tube, 5-gas pipe, 6-airflow nozzle, 7-arc-shaped limiting groove, 8-positioning block, 9-driving component, 10-winding reel. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0018] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0019] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0020] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0021] See Figure 1 , Figure 2 and Figure 3 This utility model provides a boiler structure for realizing waste heat recovery, which includes: Boiler 1 includes a combustion chamber 11 disposed inside the boiler 1 and a flue gas outlet 12 disposed on the outer wall of the boiler 1 and communicating with the combustion chamber 11; the flue gas released by combustion in the combustion chamber 11 is discharged through the flue gas outlet 12.

[0022] The condensing heat exchanger 2 includes a first heat exchanger 21 and a second heat exchanger 22 connected by heat exchange pipes. The input end of the first heat exchanger 21 is connected to the flue gas outlet 12 of the boiler 1, and the output end is connected to the flue. The input end of the second heat exchanger 22 is connected to a fan, and the output end is connected to the combustion chamber 11 of the boiler 1. The heat exchange pipes are filled with a heat exchange medium (common heat exchange medium such as water), which is driven by a circulating pump to circulate within the heat exchange pipes. It should be noted that the internal spaces of the first heat exchanger 21 and the second heat exchanger 22 are independent to fix the direction of the flue gas and ensure stable discharge of the flue gas. Optionally, the first heat exchanger 21 and the second heat exchanger 22 can be separated by a partition.

[0023] The flue gas discharge process is as follows: the flue gas is produced from the combustion chamber 11 and discharged through the flue gas outlet 12 into the first heat exchanger 21. The heat in the flue gas enters the heat exchange pipe through heat exchange, while the flue gas that cools down due to heat loss is discharged to the outside through the flue.

[0024] The heat recovery process is as follows: heat flows into the second heat exchanger 22 along with the heat exchange medium, and the fan blows out airflow to carry the heat and introduce it into the combustion chamber 11, thereby realizing the heat recovery work.

[0025] See Figure 2 , Figure 3 and Figure 4 The first heat exchanger 21 includes: The shell 3 is internally provided with heat exchange finned tubes 4, which are composed of heat exchange pipes and have fins on the outside of the pipes; the second heat exchanger 22 is also provided with heat exchange finned tubes 4. The auxiliary airflow assembly includes a plurality of airflow nozzles 6 located on the side of the heat exchange finned tube 4 near the heat exchanger input end and an air pipe 5 supporting the airflow nozzles 6. The air pipe 5 is connected to an air supply assembly, which includes an air pump and a pipe connecting the air pipe 5 and the air pump. The plurality of airflow nozzles 6 are all oriented toward the heat exchange finned tube 4. The orientation of the airflow nozzles 6 forms a predetermined angle with the flue gas flow direction.

[0026] This application utilizes the high-pressure airflow ejected from the airflow nozzle 6 to blow onto the heat exchange finned tube 4, thereby cleaning impurities adhering to the heat exchange finned tube 4. At the same time, since the orientation of the airflow nozzle 6 is at a predetermined angle to the flue gas flow direction, the airflow ejected from the airflow nozzle 6 can change the original flow direction of the flue gas, disrupting the concentration of the flue gas initially entering the first heat exchanger 21, causing the flue gas to change direction, from advection to turbulence, increasing the residence time of the flue gas in the first heat exchanger 21, and increasing the adequacy of heat exchange.

[0027] In some embodiments of this application, the auxiliary airflow assembly further includes an air inlet disposed on the housing 3, which is connected to an air pipe 5 via a flexible hose, and an air pump is connected to the outside of the air inlet via a pipe; the air pipe 5 is driven to move along a first direction; the plane of the first direction is parallel to the end plane of the heat exchange finned tube 4. This invention, through the movable air pipe 5, increases the cleaning range of the airflow and optimizes the cleaning effect of the airflow on the heat exchange finned tube 4.

[0028] The air pipe 5 is a straight pipe (it can also be described as a straight pipe below); a number of airflow nozzles 6 are distributed along the axis on the side wall of the straight pipe. Through the straight pipe structure, the distance from the number of airflow nozzles 6 to the end A of the heat exchange finned tube 4 to be cleaned is equal, ensuring that the cleaning effect of each airflow nozzle 6 is consistent.

[0029] In some embodiments of this application, the orientation of the airflow nozzle 6 can be switched at an angle; Before the straight pipe moves, the orientation of the airflow nozzle 6 is at a predetermined angle with the flue gas flow direction. In this state, the airflow ejected by the airflow nozzle 6 is mainly used for flue gas reversal. After the straight pipe moves, the airflow nozzle 6 is aligned with the direction of the flue gas flow. In this state, the blind spots of airflow cleaning under the original tilt angle are greatly eliminated, ensuring the comprehensiveness of cleaning and optimizing the cleaning effect.

[0030] Specifically, the side wall of the housing 3 is provided with a slide rail; the two ends of the straight tube are respectively rotatably connected to sliders; the sliders are slidably installed in the slide rail; a limiting structure is provided between the end of the straight tube and the slider to limit the rotation angle of the straight tube; A drive component 9 is installed on the outer wall of the housing 3. The drive component 9 has a drive end that extends into the interior of the housing 3 and is connected to a straight pipe. The drive component 9 is a telescopic cylinder.

[0031] See Figure 6 The limiting structure includes an arc-shaped limiting groove 7 disposed on the slider and a positioning block 8 that moves along the arc-shaped limiting groove 7 and is connected to the end of the straight pipe; an elastic driving member is connected between the positioning block 8 and the side wall of the arc-shaped limiting groove 7; when the elastic driving member is not compressed, the orientation of the airflow nozzle 6 is at a predetermined angle with the direction of the flue gas flow; when the airflow nozzle 6 switches orientations, the elastic driving member is compressed.

[0032] The straight tube is provided with an internal winding wheel 10 with a pull wire wound inside; the end of the pull wire is connected to the drive end.

[0033] The drive end contacts the side wall of the straight pipe during the extension process.

[0034] See Figure 5During the cleaning process, the drive component 9 extends and pushes the straight pipe to move, as shown in the figure. When the straight pipe moves from the right side to the left side, the airflow nozzle 6 moves initially at an angle to perform coarse cleaning. During the reset process of the drive component 9 (when the straight pipe moves from the left side to the right side), the straight pipe is pulled by the pull rope to rotate, the elastic drive component is compressed, and the airflow nozzle rotates to an angle parallel to the flue gas for fine cleaning.

[0035] After the drive element 9 has been reset, the elastic drive element is released, thereby driving the straight tube to reset to the tilted orientation.

[0036] In summary, this utility model provides a boiler structure for waste heat recovery, comprising: a boiler, including a combustion chamber disposed inside the boiler and a flue gas outlet disposed on the outer wall of the boiler and communicating with the combustion chamber; the flue gas released by combustion in the combustion chamber is discharged through the flue gas outlet. A condensing heat exchanger, including a first heat exchanger and a second heat exchanger connected by heat exchange pipes; the input end of the first heat exchanger is connected to the flue gas outlet of the boiler, and the output end is connected to the flue; the input end of the second heat exchanger is connected to a fan, and the output end is connected to the combustion chamber of the boiler; the heat exchange pipes are filled with a heat exchange medium (common heat exchange medium such as water), and the heat exchange medium is driven by a circulating pump to circulate within the heat exchange pipes. The internal spaces of the first heat exchanger and the second heat exchanger are independent to fix the direction of the flue gas and ensure stable discharge of the flue gas; the first heat exchanger and the second heat exchanger are isolated by a partition. The flue gas discharge process is as follows: flue gas is produced from the combustion chamber and discharged through the flue gas outlet into the first heat exchanger. The heat in the flue gas is transferred into the heat exchange pipes through heat exchange, while the flue gas, cooled due to heat loss, is discharged to the outside through the flue. The heat recovery process is as follows: heat flows into the second heat exchanger along with the heat exchange medium. A fan blows out airflow to carry the heat and introduce it into the combustion chamber, thus realizing the heat recovery work.

[0037] This invention utilizes an airflow nozzle mounted on an air pipe to eject high-pressure airflow, achieving the following: 1. By tilting the flue gas in an inclined direction, the flue gas is diverted from laminar flow to turbulent flow, increasing the heat exchange time and ensuring sufficient heat exchange. 2. The high-pressure airflow can clean impurities adhering to the heat exchange finned tubes.

[0038] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A boiler structure for realizing waste heat recovery, characterized in that, include: boiler; A condensing heat exchanger includes a first heat exchanger and a second heat exchanger connected by heat exchange pipes; the input end of the first heat exchanger is connected to the flue gas outlet of the boiler, and the output end is connected to the flue; the input end of the second heat exchanger is connected to a fan, and the output end is connected to the combustion chamber of the boiler. The first heat exchanger includes: The shell is internally composed of heat exchange pipes and finned tubes on the outside of the pipes. The auxiliary airflow assembly includes several airflow nozzles and air pipes supporting the airflow nozzles, which are located on the side of the heat exchange finned tube near the heat exchanger input end; all the airflow nozzles face the heat exchange finned tube. The airflow nozzle is oriented at a predetermined angle to the direction of the flue gas flow.

2. The boiler structure for waste heat recovery according to claim 1, characterized in that, The auxiliary airflow assembly also includes an air inlet disposed in the housing, which is connected to an air pipe via a flexible tube; the air pipe is driven to move along a first direction; The plane containing the first direction is parallel to the end plane of the heat exchange finned tube.

3. The boiler structure for waste heat recovery according to claim 1, characterized in that, The air pipe is a straight pipe; several airflow nozzles are distributed along the axis on the side wall of the straight pipe.

4. The boiler structure for waste heat recovery according to claim 3, characterized in that, The orientation of the airflow nozzle can be switched at different angles; Before the straight pipe moves, the orientation of the airflow nozzle forms a predetermined angle with the direction of the flue gas flow; After the straight pipe moves, the orientation of the airflow nozzle is parallel to the direction of the flue gas flow.

5. The boiler structure for waste heat recovery according to claim 4, characterized in that, The side wall of the housing is provided with a slide rail; the two ends of the straight tube are respectively rotatably connected to sliders; the sliders are slidably installed in the slide rail; a limiting structure is provided between the end of the straight tube and the slider to limit the rotation angle of the straight tube; A drive element is mounted on the outer wall of the housing, the drive element having a drive end that extends into the interior of the housing and is connected to a straight pipe.

6. The boiler structure for waste heat recovery according to claim 5, characterized in that, The limiting structure includes an arc-shaped limiting groove disposed on the slider and a positioning block that moves along the arc-shaped limiting groove and is connected to the end of the straight pipe. An elastic drive component is connected between the positioning block and the side wall of the arc-shaped limiting groove; When the elastic actuator is not compressed, the orientation of the airflow nozzle is at a predetermined angle to the direction of the flue gas flow; when the airflow nozzle switches orientations, the elastic actuator is compressed.

7. The boiler structure for waste heat recovery according to claim 6, characterized in that, The straight tube is provided with an internal winding wheel with a pull wire wound around it in the middle. The end of the pull cable is connected to the drive end.

8. The boiler structure for waste heat recovery according to claim 5, characterized in that, The drive end contacts the side wall of the straight pipe during the extension process.

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