Two-stage condensation heat exchanger

Abstract

The utility model belongs to the technical field of heat exchange equipment, and particularly relates to a two-stage condensation heat exchanger which comprises a shell with a heat exchange cavity, a smoke inlet and a smoke outlet are formed in the left side and the right side of the upper portion of the front end of the shell, a plurality of heat absorption pipes are vertically arranged in the heat exchange cavity, and part of adjacent heat absorption pipes form a heat absorption pipe set. The ends of every two adjacent heat absorption pipe sets are communicated through a water passing cavity, a water inlet port and a water outlet port are formed in the shell, the heat absorption pipes comprise linear heat absorption pipes and U-shaped heat absorption pipes, U-shaped elbows of the U-shaped heat absorption pipes are located at inner ports of the smoke inlets, and the cross sections of the U-shaped elbows of the U-shaped heat absorption pipes are of an oval structure with the long axis facing the smoke inlets. The U-shaped heat absorption pipe is arranged on the inner side of the flue gas inlet, so that the wind resistance of flue gas entering the heat exchange chamber can be effectively reduced, the gas wall-hanging stove can select an air feeder with lower power to convey the flue gas, and the cost of equipment is reduced.

Description

Technical field:

[0001] The utility model belongs to the technical field of heat exchange equipment, in particular to a two-stage condensing heat exchanger. Background technology:

[0002] Gas wall-mounted boilers are usually equipped with combustion chambers, heat exchangers and other corresponding devices. The combustion chamber burns gas to generate a large amount of heat, which is transferred to the cold water flowing through the heat exchanger from the water inlet pipe with the help of the heat exchanger, so that the water temperature of the cold water rises to form hot water discharged from the water outlet pipe; the high-temperature flue gas generated by the combustion will also pass through a set of flue gas secondary condensation heat exchangers, which will recover the heat in the flue gas to preheat the water flow, effectively improving the heat exchange rate of the gas wall-mounted boiler.

[0003] At present, most of the existing secondary condensation heat exchangers directly arrange the heat absorption tube in the smoke exhaust channel. The smoke is sent into the smoke exhaust channel under the action of the fan to realize the heat exchange between it and the heat absorption tube. However, since the common heat absorption tube is a round straight tube structure, its wind resistance is relatively large, and the smoke needs a high-power fan to be effectively sent into the smoke exhaust channel. Summary of the invention:

[0004] The purpose of the utility model is to provide a two-stage condensing heat exchanger, which adopts a U-shaped heat absorption tube on the inner side of the flue gas inlet to effectively reduce the wind resistance of the flue gas entering the heat exchange chamber, so that the gas wall-mounted boiler can use a smaller power blower to transport the flue gas, thereby reducing the cost of the equipment.

[0005] The utility model is achieved in this way:

[0006] A two-stage condensing heat exchanger comprises a shell having a heat exchange chamber, a flue gas inlet and a flue gas outlet connected to the heat exchange chamber are opened on the left and right sides of the upper front end of the shell, a plurality of heat absorption tubes are vertically arranged in the heat exchange chamber, and some adjacent heat absorption tubes form a heat absorption tube group, and the ends of adjacent heat absorption tube groups are connected through a water chamber to form a water flow channel with a serpentine structure, and a water inlet port connected to the head end of the water flow channel and a water outlet port connected to the tail end of the water flow channel are arranged on the shell, and the heat absorption tube comprises a linear heat absorption tube and a U-shaped heat absorption tube, the U-shaped elbow of the U-shaped heat absorption tube is located at the inner port of the flue gas inlet, and the cross section of the U-shaped elbow of the U-shaped heat absorption tube is an elliptical structure with the major axis facing the flue gas inlet.

[0007] In the above-mentioned two-stage condensing heat exchanger, the adjacent U-shaped heat absorbing tubes are arranged in a front-to-back staggered manner.

[0008] In the above-mentioned two-stage condensing heat exchanger, a middle partition is arranged in the heat exchange chamber for separating the smoke inlet and the smoke outlet on the left and right, and a smoke passage for the smoke to pass through is present between the rear side wall and the lower side wall of the middle partition and the inner wall surface of the heat exchange chamber, and the water flow channel includes a water inlet section, a middle section and a water outlet section from the beginning to the end, the water inlet section and the middle section are both located in the shell on the smoke inlet side, the water outlet section is located in the shell on the smoke outlet side, and the middle section is composed of a U-shaped heat absorption tube.

[0009] In the above-mentioned two-stage condensing heat exchanger, the water flow cross-sectional area of ​​the middle section is smaller than the water flow cross-sectional area of ​​the water inlet section.

[0010] In the above-mentioned two-stage condensing heat exchanger, the water flow cross-sectional area of ​​the water outlet section is larger than the water flow cross-sectional area of ​​the water inlet section.

[0011] In the above-mentioned two-stage condensing heat exchanger, the length of the U-shaped heat absorption tube is greater than the length of the linear heat absorption tube.

[0012] In the above-mentioned two-stage condensing heat exchanger, the top surface of the heat exchange chamber includes a high table distributed front and back, and a low table lower than the high table, the high table and the low table are smoothly connected by an inclined guide surface, the middle section is located directly below the high table, and the water inlet section is located directly below the inclined guide surface and the low table.

[0013] In the above-mentioned secondary condensing heat exchanger, the top and bottom of the heat exchange chamber are provided with a smoke barrier cover and a water flow cover located outside the smoke barrier cover. The smoke barrier cover and the water flow cover are attached to the inside and outside of the water flow cover to form the water flow chamber. The two ends of each heat absorption tube respectively pass through the corresponding smoke barrier cover and are connected to the corresponding water flow chamber.

[0014] In the above-mentioned two-stage condensing heat exchanger, the shell includes an upper shell and a lower shell spliced ​​together, and the heat exchange chamber is formed between the upper shell and the lower shell. The flue gas inlet, flue gas outlet, water inlet port, water outlet port and middle partition are all arranged on the upper shell.

[0015] In the above-mentioned two-stage condensing heat exchanger, a drainage port communicating with the heat exchange chamber is provided on the lower shell.

[0016] The outstanding advantages of the utility model compared with the prior art are:

[0017] The utility model has a simple structure, reasonable design and low cost. By adopting a U-shaped heat absorption tube on the inner side of the smoke inlet, and the cross-section of the U-shaped elbow of the U-shaped heat absorption tube is an elliptical structure with the major axis facing the smoke inlet, the wind resistance of the smoke entering the heat exchange chamber can be effectively reduced. Therefore, the gas wall-mounted boiler can select a smaller power blower for conveying smoke, thereby reducing the cost of equipment; at the same time, the U-shaped elbow of the U-shaped heat absorption tube can effectively guide the flow direction of water flow to turn, ensuring that the water flow rate can flow through faster. Description of the drawings:

[0018] Figure 1 The utility model is an overall three-dimensional Figure 1 ;

[0019] Figure 2 The utility model is an overall three-dimensional Figure 2 ;

[0020] Figure 3 It is an overall cross-sectional view of the utility model;

[0021] Figure 4 It is a three-dimensional diagram of the upper shell of the utility model;

[0022] Figure 5 The utility model is a water flow channel structure Figure 1 ;

[0023] Figure 6 The utility model is a water flow channel structure Figure 2 .

[0024] In the figure: 1. Smoke inlet; 2. Smoke outlet; 3. Water passage chamber; 4. Water inlet port; 5. Water outlet port; 6. Linear heat absorption tube; 7. U-shaped heat absorption tube; 8. Middle partition; 9. Water inlet section; 10. Middle section; 11. Water outlet section; 12. High table; 13. Low table; 14. Inclined guide surface; 15. Smoke barrier cover; 16. Water passage cover; 17. Upper shell; 18. Lower shell; 19. Drainage port. Specific implementation method:

[0025] The present invention is further described below with reference to specific embodiments. Figure 1 —6:

[0026] A two-stage condensing heat exchanger comprises a shell having a heat exchange chamber, a flue gas inlet 1 and a flue gas outlet 2 connected to the heat exchange chamber are provided on the left and right sides of the upper front end of the shell, a plurality of heat absorption tubes are vertically arranged in the heat exchange chamber, and some adjacent heat absorption tubes form a heat absorption tube group, and the ends of adjacent heat absorption tube groups are connected through a water chamber 3 to form a water flow channel with a serpentine structure, a water inlet port 4 connected to the head end of the water flow channel, and a water outlet port 5 connected to the tail end of the water flow channel are provided on the shell, and the heat absorption tube comprises a linear heat absorption tube 6 and a U-shaped heat absorption tube 7, the U-shaped elbow of the U-shaped heat absorption tube 7 is located at the inner port of the flue gas inlet 1, and the cross section of the U-shaped elbow of the U-shaped heat absorption tube 7 is an elliptical structure with the major axis facing the flue gas inlet 1.

[0027] The utility model has a simple structure, reasonable design and low cost. By adopting a U-shaped heat absorption tube 7 on the inner side of the flue gas inlet 1, and the cross-section of the U-shaped elbow of the U-shaped heat absorption tube 7 is an elliptical structure with the major axis facing the flue gas inlet 1, the wind resistance of the flue gas entering the heat exchange chamber can be effectively reduced. Therefore, the gas wall-mounted boiler can select a smaller power blower for conveying flue gas, thereby reducing the cost of the equipment.

[0028] At the same time, since adjacent linear heat absorption tubes 6 are connected through the water chamber 3, the flow direction of the water flow is relatively direct and has a large angle, so the water flow velocity is seriously affected. The U-shaped elbow of the U-shaped heat absorption tube 7 can effectively guide the flow direction of the water flow to turn, ensuring that the water flow velocity can flow faster.

[0029] In order to further reduce the wind resistance of the U-shaped heat absorbing tube 7 to the flue gas, in this embodiment, the adjacent U-shaped heat absorbing tubes 7 are staggered front to back.

[0030] Furthermore, in order to allow the water in the water flow channel to fully exchange heat with the flue gas, a middle partition 8 is provided in the heat exchange chamber for separating the flue gas inlet 1 and the flue gas outlet 2 on the left and right, and a smoke passage for the flue gas to pass through is provided between the rear side wall and the lower side wall of the middle partition 8 and the inner wall surface of the heat exchange chamber. The water flow channel includes a water inlet section 9, a middle section 10 and a water outlet section 11 from beginning to end. The water inlet section 9 and the middle section 10 are both located in the shell on the side of the flue gas inlet 1, the water outlet section 11 is located in the shell on the side of the flue gas outlet 2, and the middle section 10 is composed of a U-shaped heat absorption tube 7.

[0031] Furthermore, the water flow cross-sectional area of ​​the middle section 10 is smaller than that of the water inlet section 9. That is, the water flow cross-sectional area in the middle section 10 is smaller, which will make the flow velocity faster accordingly, so that when the high-temperature flue gas flows in from the flue gas inlet 1, it can exchange heat with the water flow with a faster flow velocity, thereby effectively taking away a large amount of heat in the flue gas.

[0032] Furthermore, the water flow cross-sectional area of ​​the water outlet section 11 is larger than that of the water inlet section 9. The water flow velocity in the water outlet section 11 is the slowest, which can ensure that the water temperature flowing out of the water outlet port 5 is high, that is, prolong the heat exchange time between the water flow and the flue gas.

[0033] Since the water flow in the middle section 10 is relatively rapid, in order to prolong the heat exchange effect between the middle section 10 and the flue gas, the length of the U-shaped heat absorption tube 7 is greater than that of the linear heat absorption tube 6 .

[0034] In addition, in order to effectively slow down the flow rate of the smoke and guide the smoke to flow downward and backward to pass through the smoke passage, the top surface of the heat exchange chamber includes a high table 12 distributed front and back, and a low table 13 lower than the high table 12. The high table 12 and the low table 13 are smoothly connected by an inclined guide surface 14. The middle section 10 is located directly below the high table 12, and the water inlet section 9 is located directly below the inclined guide surface 14 and the low table 13.

[0035] Furthermore, in the present embodiment, the specific formation structure of the water-passing chamber 3 is as follows: a smoke barrier cover 15 and a water-passing cover 16 located outside the smoke barrier cover 15 are provided on the top and bottom of the heat exchange chamber, and the smoke barrier cover 15 and the water-passing cover 16 are attached to each other inside and outside to form the water-passing chamber 3, and both ends of each heat absorption tube respectively pass through the corresponding smoke barrier cover 15 and are connected to the corresponding water-passing chamber 3.

[0036] At the same time, the specific structure adopted by the shell is: the shell includes an upper shell 17 and a lower shell 18 spliced ​​together, the heat exchange chamber is formed between the upper shell 17 and the lower shell 18, and the smoke inlet 1, the smoke outlet 2, the water inlet port 4, the water outlet port 5 and the middle partition plate 8 are all arranged on the upper shell 17.

[0037] Furthermore, considering that the flue gas is prone to condensation and produce condensed water during the heat exchange process, in order to discharge the condensed water dripping into the shell, a drainage port 19 connected to the heat exchange chamber is opened on the lower shell 18.

[0038] The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes made based on the shape, structure, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A two-stage condensing heat exchanger, Features: The invention comprises a shell having a heat exchange chamber, wherein a smoke inlet (1) and a smoke outlet (2) connected to the heat exchange chamber are provided on the left and right sides of the upper front end of the shell, wherein a plurality of heat absorption tubes are vertically arranged in the heat exchange chamber, wherein some adjacent heat absorption tubes form a heat absorption tube group, wherein the ends of adjacent heat absorption tube groups are connected through a water chamber (3) to form a water flow channel with a serpentine structure, wherein a water inlet port (4) connected to the head end of the water flow channel and a water outlet port (5) connected to the tail end of the water flow channel are provided on the shell, wherein the heat absorption tube comprises a linear heat absorption tube (6) and a U-shaped heat absorption tube (7), wherein the U-shaped elbow of the U-shaped heat absorption tube (7) is located at the inner port of the smoke inlet (1), and the cross section of the U-shaped elbow of the U-shaped heat absorption tube (7) is an elliptical structure with the major axis facing the smoke inlet (1).

2. A two-stage condensing heat exchanger according to claim 1, Features: Adjacent U-shaped heat absorbing tubes (7) are arranged in a front-to-back staggered manner.

3. A two-stage condensing heat exchanger according to claim 1, Features: The heat exchange chamber is provided with a middle partition (8) for separating a smoke inlet (1) and a smoke outlet (2) on the left and right, and a smoke passage for smoke to pass through is provided between the rear side wall and the lower side wall of the middle partition (8) and the inner wall surface of the heat exchange chamber, and the water flow passage comprises a water inlet section (9), a middle section (10) and a water outlet section (11) in sequence from the beginning to the end, the water inlet section (9) and the middle section (10) are both located in the shell on the side of the smoke inlet (1), the water outlet section (11) is located in the shell on the side of the smoke outlet (2), and the middle section (10) is composed of a U-shaped heat absorption tube (7).

4. A two-stage condensing heat exchanger according to claim 3, Features: The water flow cross-sectional area of ​​the middle section (10) is smaller than the water flow cross-sectional area of ​​the water inlet section (9).

5. A two-stage condensing heat exchanger according to claim 3 or 4, Features: The water flow cross-sectional area of ​​the water outlet section (11) is larger than the water flow cross-sectional area of ​​the water inlet section (9).

6. A two-stage condensing heat exchanger according to claim 3, Features: The length of the U-shaped heat absorbing tube (7) is greater than the length of the linear heat absorbing tube (6).

7. A two-stage condensing heat exchanger according to claim 6, Features: The top surface of the heat exchange chamber comprises a high table (12) distributed front and back, and a low table (13) lower than the high table (12); the high table (12) and the low table (13) are smoothly connected via an inclined guide surface (14); the middle section (10) is located directly below the high table (12); and the water inlet section (9) is located directly below the inclined guide surface (14) and the low table (13).

8. A two-stage condensing heat exchanger according to claim 1, Features: The top and bottom of the heat exchange chamber are both provided with a smoke barrier cover (15) and a water flow cover (16) located outside the smoke barrier cover (15); the smoke barrier cover (15) and the water flow cover (16) are attached to each other inside and outside to form the water flow chamber (3); and both ends of each heat absorption tube respectively pass through the corresponding smoke barrier cover (15) and are connected to the corresponding water flow chamber (3).

9. A two-stage condensing heat exchanger according to claim 3, Features: The shell comprises an upper shell (17) and a lower shell (18) which are spliced ​​together, the heat exchange chamber is formed between the upper shell (17) and the lower shell (18), and the smoke inlet (1), the smoke outlet (2), the water inlet port (4), the water outlet port (5) and the middle partition plate (8) are all arranged on the upper shell (17).

10. A two-stage condensing heat exchanger according to claim 9, Features: The lower shell (18) is provided with a drainage port (19) which is in communication with the heat exchange chamber.

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