Novel gas-fired boiler waste heat recovery device

Abstract

The utility model relates to a novel waste heat recovery device of a gas-fired boiler. The heat exchanger comprises a heat exchange body, an air inlet end, an air outlet end, a water inlet end and a water drainage end, a first partition plate, a second partition plate, a third partition plate and a fourth partition plate are horizontally arranged in the heat exchange body from bottom to top, an inner cavity of the heat exchange body is divided into a water inlet cavity, an air inlet cavity, a heat exchange cavity, an air outlet cavity and a transfer cavity, and a communicating pipe is further communicated between the heat exchange cavity and the transfer cavity; a plurality of heat exchange rods are vertically arranged in the heat exchange cavity, each heat exchange rod is composed of an inner pipe and an outer pipe which are connected in a sleeved mode, an annular air cavity is formed between each inner pipe and the corresponding outer pipe, and the two ends of each inner pipe are arranged in an extending mode so that the water inlet cavity and the transfer cavity can be communicated through the inner pipes. And the annular air cavity communicates the air inlet cavity with the air outlet cavity. The heat exchange rods are straight pipes, the heat exchange efficiency can be effectively improved through the mode that the heat exchange rods are connected in parallel, the structure is simplified, and the production and installation difficulty is lowered.

Description

Technical Field

[0001] The utility model relates to a boiler waste heat recovery device, in particular to a novel gas boiler waste heat recovery device. Background Art

[0002] Gas-fired boilers are widely used in heating, hot water supply, and industrial production. Gas-fired boilers can be categorized into various types based on their function and purpose, including: gas-fired water boilers, primarily used for water supply; gas-fired hot water boilers, also known as gas-fired heating boilers and gas-fired bathing boilers, used for heating and domestic hot water supply; and gas-fired steam boilers, which provide high-temperature, high-pressure steam for industrial production. Regardless of the type of gas-fired boiler, during operation, it continuously generates large amounts of high-heat exhaust gases, which contain a high energy content. Therefore, to improve resource utilization, existing gas-fired boilers are generally equipped with heat exchangers to recover heat from the flue gas. Furthermore, the exhaust gas from gas-fired boilers contains low levels of solid particulate matter, such as soot, requiring less attention to flue gas filtration and subsequent pipe cleaning, thus simplifying the heat exchanger's structure. However, to improve heat exchange efficiency, existing heat exchangers are relatively large, with long internal heat exchange tubes and complex, winding wiring. This not only increases the complexity of production but also makes subsequent maintenance more difficult. Summary of the Invention

[0003] The utility model provides a novel waste heat recovery device for a gas boiler, which solves the problems in the prior art of a large structure, long internal heat exchange tubes, and complex and winding wiring.

[0004] The above technical problems of the present invention are mainly solved by the following technical solutions: A new type of waste heat recovery device for a gas boiler, comprising a heat exchanger, an air inlet end, an exhaust end, a water inlet end and a drain end, wherein the heat exchanger is in the shape of a hollow barrel, and a first partition, a second partition, a third partition and a fourth partition are arranged horizontally from bottom to top inside the heat exchanger, and the inner cavity of the heat exchanger is divided from bottom to top into a water inlet cavity, an air inlet cavity, a heat exchange cavity, an exhaust cavity and a transfer cavity, the air inlet end is communicated with the air inlet cavity, the exhaust end is communicated with the exhaust cavity, and the The water inlet end is connected to the water inlet chamber, the drainage end is connected to the heat exchange chamber, and a connecting pipe is also connected between the heat exchange chamber and the transfer chamber; a number of heat exchange rods are vertically arranged in the heat exchange chamber, and the heat exchange rods are composed of an inner tube and an outer tube that are mutually socketed, and an annular air cavity is formed between the inner tube and the outer tube. The two ends of the inner tube are extended so that the inner tube connects the water inlet chamber and the transfer chamber, and the two ends of the outer tube are connected to the second partition plate and the third partition plate, so that the annular air cavity connects the air inlet chamber and the exhaust chamber.

[0005] The heat exchanger, four-layer partitions, and heat exchange rods in the present invention are all metal parts, especially the heat exchange rods, which are generally made of copper or aluminum. The air inlet end is used to connect with the exhaust pipe of the gas boiler. The high-temperature exhaust gas is diverted to each annular air cavity through the air inlet cavity, and re-converges in the exhaust cavity, and finally discharged from the exhaust end; at the same time, cold water flows into the water inlet cavity through the water inlet end, and then diverts to each inner tube, and re-converges in the transfer cavity, and then flows into the heat exchange cavity through the connecting pipe, and finally flows out from the drainage end. The heat exchange area of ​​the present invention is the pipe wall of the inner tube and the outer tube. Both tubes are straight tubes. The water used for heat exchange flows through the inner and outer sides of the annular air cavity filled with hot exhaust gas twice, which can fully carry out heat exchange.

[0006] Furthermore, a heat conducting sheet connecting the inner tube and the outer tube is provided in the annular air cavity. The heat conducting sheet can increase the contact area with the hot gas and transfer the heat to the tube walls of the inner tube and the outer tube, thereby enhancing the heat exchange efficiency.

[0007] Furthermore, the heat conducting fins are distributed in a spiral curve, so that the air flow channel within the annular air cavity is also spiral-shaped. This further increases the heat exchange area for the hot air and also results in relatively little obstruction to the gas flow, avoiding the problem of significantly increasing the flow resistance of the exhaust gas within the pipe due to the increase in excessive contact surface.

[0008] Furthermore, the connection between the drainage end and the connecting pipe on the heat exchange chamber is arranged diagonally, which increases the distance that the water flows in the heat exchange chamber and helps to ensure that the water in each area of ​​the heat exchange chamber flows, thereby reducing the probability of dead water areas.

[0009] Therefore, compared with the prior art, the present invention has the following characteristics: 1. The heat exchange area of ​​the present invention is the inner tube and the outer tube on the heat exchange rod. The heat exchange rod is a straight tube. By connecting multiple heat exchange rods in parallel, the heat exchange efficiency can be effectively improved, which is beneficial to the present invention to streamline the structure and simplify the production and installation difficulty; 2. A heat conducting plate connecting the inner tube and the outer tube is provided in the annular air cavity. The heat conducting plate can increase the contact area with the hot gas and transfer the heat to the tube walls of the inner tube and the outer tube, thereby enhancing the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Attachment Figure 1 It is a structural schematic diagram of the utility model;

[0011] Attachment Figure 2 It is a transverse cross-sectional view of the utility model;

[0012] Attachment Figure 3 It is a longitudinal sectional view of the present utility model. DETAILED DESCRIPTION

[0013] The technical solution of the present invention will be further specifically described below with reference to embodiments and in conjunction with the accompanying drawings.

[0014] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0015] Example 1: See Figure 1 、 Figure 2 and Figure 3 A new type of waste heat recovery device for a gas boiler includes a heat exchanger 100, an air inlet end 10, an exhaust end 20, a water inlet end 30 and a drain end 40. The heat exchanger is a stainless steel hollow barrel, and a first partition 110, a second partition 120, a third partition 130 and a fourth partition 140 made of stainless steel are arranged horizontally from bottom to top inside the heat exchanger, and the inner cavity of the heat exchanger is divided from bottom to top into a water inlet chamber 150, an air inlet chamber 160, a heat exchange chamber 170, an exhaust chamber 180 and a transfer chamber 190. The air inlet end is connected to the air inlet chamber, the exhaust end is connected to the exhaust chamber, the water inlet end is connected to the water inlet chamber, and the drain end is connected to the exhaust chamber. It is connected to the bottom area of ​​the heat exchange chamber, and a connecting pipe 50 is also connected between the top area of ​​the heat exchange chamber and the transfer chamber. The connection between the drainage end and the connecting pipe on the heat exchange chamber is set diagonally; a number of heat exchange rods 200 are vertically arranged in the heat exchange chamber. The heat exchange rods are composed of an inner tube 210 and an outer tube 220 that are mutually socketed. The heat exchange rods are made of alloy copper as a whole. An annular air cavity 230 is formed between the inner tube and the outer tube. The two ends of the inner tube are extended so that the inner tube connects the water inlet chamber and the transfer chamber. The two ends of the outer tube are connected to the second partition plate and the third partition plate, so that the annular air cavity connects the air inlet chamber and the exhaust chamber.

[0016] The air inlet connects to the gas boiler's exhaust pipe. High-temperature exhaust gas is diverted through the air inlet cavity into the various annular cavities, reunited in the exhaust cavity, and ultimately discharged from the exhaust end. Simultaneously, cold water flows into the water inlet cavity through the water inlet, then diverts to the various inner tubes, reunites in the transfer cavity, flows through the connecting pipe into the heat exchange cavity, and ultimately flows out of the drain end. The heat exchange area in this embodiment is the walls of the inner and outer tubes, both of which are straight. The heat exchange water flows twice, passing through the inner and outer sides of the annular cavity filled with hot exhaust gas, ensuring efficient heat exchange.

[0017] See Figure 3The annular cavity is equipped with heat conducting fins 240 connecting the inner and outer tubes. These fins are arranged in a spiral curve, creating a spiral-shaped air flow path within the annular cavity. This further increases the heat exchange area for the hot air and minimizes the obstruction to gas flow, eliminating the problem of significantly increased flow resistance within the pipe caused by excessive contact surface.

[0018] See Figure 3 The openings of the air inlet end, the exhaust end, the water inlet end and the drainage end are all provided with flange joints 60.

[0019] See Figure 3 The outside of the air inlet end is wrapped with insulation cotton 70, which is specifically high-temperature glass wool or aluminum silicate insulation cotton. The outside of the heat exchanger, the drainage end and the connecting pipe are wrapped with an insulation layer 80.

[0020] It is obvious to those skilled in the art that the present invention can be modified in many ways, and such modifications are not considered to depart from the scope of the present invention. All such modifications obvious to those skilled in the art are intended to be included within the scope of the present claims.

Claims

1. A novel waste heat recovery device for a gas boiler, comprising a heat exchanger, an air inlet end, an exhaust end, a water inlet end, and a drain end, characterized in that: The heat exchanger is in the shape of a hollow barrel, and a first partition, a second partition, a third partition and a fourth partition are horizontally arranged inside the heat exchanger from bottom to top, and the inner cavity of the heat exchanger is divided from bottom to top into a water inlet chamber, an air inlet chamber, a heat exchange chamber, an exhaust chamber and a transfer chamber, the air inlet end is connected to the air inlet chamber, the exhaust end is connected to the exhaust chamber, the water inlet end is connected to the water inlet chamber, the drainage end is connected to the heat exchange chamber, and a connecting pipe is also connected between the heat exchange chamber and the transfer chamber; a plurality of heat exchange rods are vertically arranged in the heat exchange chamber, and the heat exchange rods are composed of an inner tube and an outer tube that are mutually socketed, and an annular air cavity is formed between the inner tube and the outer tube, and the two ends of the inner tube are extended so that the inner tube connects the water inlet chamber and the transfer chamber, and the two ends of the outer tube are connected to the second partition and the third partition, so that the annular air cavity connects the air inlet chamber and the exhaust chamber.

2. The novel gas boiler waste heat recovery device according to claim 1 is characterized in that: A heat conducting sheet connecting the inner tube and the outer tube is provided in the annular air cavity.

3. The novel gas boiler waste heat recovery device according to claim 2 is characterized in that: The heat conducting sheet is distributed in a spiral curve, so that the air flow channel in the annular air cavity is in the shape of a spiral curve.

4. The novel gas boiler waste heat recovery device according to claim 1 is characterized in that: The connection parts of the drainage end and the connecting pipe on the heat exchange chamber are arranged diagonally.

5. The novel gas boiler waste heat recovery device according to claim 1 is characterized in that: The openings of the air inlet end, the exhaust end, the water inlet end and the drainage end are all provided with flange joints.

6. The novel gas boiler waste heat recovery device according to claim 1 is characterized in that: The outside of the air inlet end is wrapped with heat insulation cotton, and the outsides of the heat exchange body, the drainage end and the connecting pipe are wrapped with a heat insulation layer.

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