Energy-saving mechanism of gas-fired boiler

Abstract

The utility model belongs to the technical field of boiler, concretely relates to a kind of energy-saving mechanism of gas-fired boiler, including furnace body;Water storage cylinder, the water storage cylinder is located at the inside of the furnace body, the inside of this water storage cylinder is sleeved with water storage inner cylinder, and the gap between the outer wall of water storage inner cylinder and the inner wall of water storage cylinder is left, and backflow cavity is formed by the gap;Second smoke return cavity, the second smoke return cavity is located at the top of the water storage cylinder, and predetermined gap is equipped between the second smoke return cavity and the water storage inner cylinder, its purpose is to form backflow cavity by water storage cylinder and water storage inner cylinder, and the multistage flue gas circulation structure of smoke pipe, second smoke return cavity, second air duct and bottom first smoke return cavity is matched, so that high-temperature flue gas first heats water storage inner cylinder cold water, then is heated backflow cavity hot water by air duct backflow, and finally is discharged by first air duct, fully utilizes flue gas gradient heat, solves the problem of traditional flue gas circulation heat attenuation, and greatly improves heat energy utilization efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of boiler technology, specifically relating to an energy-saving mechanism for a gas-fired boiler. Background Technology

[0002] Gas-fired boilers are a type of heating equipment widely used in industrial and civil fields. They use gas as fuel to generate heat energy through combustion, which is then used to heat water or other media to meet the needs of heating, hot water supply, etc.

[0003] Currently, to improve thermal energy utilization efficiency, the number of hot gas return cycles within the furnace is typically increased to enhance heat exchange. However, during flue gas circulation, its heat continuously decreases, leading to a gradual decline in the heating efficiency of the water inside the boiler. Furthermore, when multi-stage circulating flue gas exchanges heat with the water inside the boiler simultaneously, uneven heat exchange can easily occur. Utility Model Content

[0004] In view of this, the present invention provides an energy-saving mechanism for a gas-fired boiler, the purpose of which is to improve heat exchange efficiency by reducing the fluctuation of water temperature inside the boiler, thereby achieving energy saving.

[0005] The technical solution adopted in this utility model is as follows: An energy-saving mechanism for a gas-fired boiler includes a boiler body; A water storage cylinder is located inside the furnace body. An inner water storage cylinder is fitted inside the water storage cylinder, and a gap is left between the outer wall of the inner water storage cylinder and the inner wall of the water storage cylinder, forming a reflux cavity through the gap. The second smoke chamber is located at the top of the water storage cylinder. A predetermined gap is provided between the second smoke chamber and the inner water storage cylinder, and an overflow groove is formed by the predetermined gap. A flue pipe is located inside the water storage inner cylinder and is connected to the second return smoke chamber. The return cavity is provided with several second air guide pipes distributed around the inner water storage cylinder, and all the second air guide pipes are connected to the second smoke return cavity.

[0006] In some embodiments, the system further includes a first smoke return chamber, which is arranged around the bottom of the water storage inner cylinder, and the second air guide pipe is connected to the first smoke return chamber.

[0007] In some embodiments, the top of the furnace body is provided with a smoke exhaust hood, the top of which has a smoke exhaust port. The side wall of the smoke exhaust hood is provided with a plurality of first air guide pipes, which pass through the furnace body and are connected to the first smoke return chamber.

[0008] In some embodiments, the number of the first air guide tubes corresponds to the number of the second air guide tubes, and a heat exchange plate is provided between the first air guide tubes and the second air guide tubes.

[0009] In some embodiments, the heat exchange plate is arranged in an arc shape, with sleeve holes at both ends along its length that are adapted to the first and second air guide pipes, and a plurality of flow guide grooves are formed on the surface of the heat exchange plate.

[0010] In some embodiments, the inner walls of both the first air guide tube and the second air guide tube are provided with a corrugated layer.

[0011] In some embodiments, the bottom of the furnace body is provided with a combustion chamber, which is connected to a flue gas pipe.

[0012] In some embodiments, the surface of the flue pipe is fitted with a plurality of heat-conducting rings arranged in an array along its length.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. By forming a reflux chamber through the water storage cylinder and the inner water storage cylinder, and combined with the multi-stage flue gas circulation structure of the flue gas pipe, the second flue gas return chamber, the second air guide pipe and the bottom first flue gas return chamber, the high-temperature flue gas first heats the cold water in the inner water storage cylinder, then flows back through the air guide pipe to heat the hot water in the reflux chamber, and finally is discharged through the first air guide pipe. This fully utilizes the gradient heat of the flue gas, solves the problem of heat attenuation in traditional flue gas circulation, and greatly improves the efficiency of thermal energy utilization.

[0014] 2. The first flue gas chamber surrounds the bottom of the water storage cylinder in an annular shape, and the second air guide pipe is distributed around the water storage cylinder. Combined with the overflow trough, hot water and cold water are distributed in an orderly manner, so that the heat of the flue gas is evenly applied to all areas of the water body, avoiding local overheating or cold areas. This effectively improves the problem of uneven heat exchange caused by multi-stage heat exchange and reduces water temperature fluctuations in the furnace body.

[0015] 3. By setting an arc-shaped heat exchange plate between the corresponding first and second air guide pipes, the heat conduction characteristics of the heat exchange plate are used to achieve lateral heat diffusion. At the same time, the arc-shaped structure and surface guide grooves expand the contact area and promote water flow turbulence, further enhancing the heat preservation and heating effect of the hot water in the return cavity and improving the overall heat exchange efficiency. Attached Figure Description

[0016] This utility model will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the energy-saving mechanism of the gas boiler provided by this utility model.

[0017] Figure 2 This is a schematic diagram of the internal structure of the furnace body provided by this utility model.

[0018] Figure 3This is a schematic diagram of the distribution of the air duct provided by this utility model.

[0019] Figure 4 This utility model provides Figure 3 A magnified structural diagram of point A in the middle.

[0020] Figure 5 This is a schematic diagram of the heat exchange plate provided by this utility model.

[0021] Figure 6 This is a schematic diagram of the internal structure of the air guide tube provided by this utility model.

[0022] 1. Furnace body; 2. Exhaust hood; 3. Exhaust port; 4. First air guide pipe; 5. Combustion chamber; 6. Inner water storage cylinder; 7. Water storage cylinder; 8. First flue gas return chamber; 9. Water inlet; 10. Flue gas pipe; 11. Heat conduction ring; 12. Second flue gas return chamber; 13. Second air guide pipe; 14. Heat exchange plate; 15. Overflow groove; 16. Sleeve hole; 17. Guide groove; 18. Corrugated layer. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1 In existing technologies, to improve thermal energy utilization efficiency, the number of hot gas return cycles within the furnace is typically increased to enhance heat exchange. However, during flue gas circulation, its heat continuously diminishes, leading to a gradual decrease in heating efficiency for the water inside the boiler. Furthermore, when multi-stage circulating flue gas exchanges heat with the boiler water simultaneously, it can easily cause uneven heat exchange.

[0025] Therefore, in order to solve the above problems and achieve the functions of reducing water temperature fluctuations inside the furnace and improving heat exchange efficiency, please refer to... Figures 1-4This application proposes an energy-saving mechanism for a gas-fired boiler. It includes a boiler body 1; a water storage cylinder 7, located inside the boiler body 1, with an inner water storage cylinder 6 nested inside the water storage cylinder 7, and a gap between the outer wall of the inner water storage cylinder 6 and the inner wall of the water storage cylinder 7 forming a reflux chamber; a second flue gas chamber 12, located at the top of the water storage cylinder 7, with a predetermined gap between the second flue gas chamber 12 and the inner water storage cylinder 6 forming an overflow groove 15; and a flue gas pipe 10, located inside the inner water storage cylinder 6 and connected to the second flue gas chamber 12; wherein, the reflux chamber contains a plurality of second air guide pipes 13 distributed around the inner water storage cylinder 6, and all second air guide pipes 13 are connected to the second flue gas chamber 12. In this embodiment, a multi-stage flue gas circulation path is constructed through the coordinated design of the reflux chamber formed by the furnace body 1, the water storage cylinder 7 and the inner water storage cylinder 6, the second flue gas return chamber 12 and the overflow trough 15, the flue gas pipe 10, and the second air guide pipe 13, effectively addressing the problems of heat attenuation and uneven heat exchange during flue gas circulation. Specifically, the high-temperature flue gas first heats the cold water in the inner water storage cylinder 6, and then enters the reflux chamber through the second air guide pipe 13 to reheat and maintain the temperature of the hot water in the reflux chamber. This design avoids the phenomenon of uneven temperature inside the boiler caused by flue gas cooling in traditional technologies, while achieving efficient utilization of flue gas heat. For example, the furnace body 1 has a water storage cylinder 7 inside, and a water storage inner cylinder 6 is nested inside the water storage cylinder 7, forming a reflux cavity between the two. A predetermined gap is left between the top of the water storage inner cylinder 6 and the second flue gas return cavity 12 to form an overflow groove 15. The flue gas pipe 10 is located inside the water storage inner cylinder 6 and connects to the second flue gas return cavity 12. Several second air guide pipes 13 are distributed around the water storage inner cylinder 6 in the reflux cavity, and all the second air guide pipes 13 are connected to the second flue gas return cavity 12. During operation, cold water first enters the water storage inner cylinder 6 through the water inlet 9 and is initially heated through the flue gas pipe 10. The heated water rises to the top of the water storage inner cylinder 6 and enters the reflux cavity through the overflow groove 15. After the high-temperature flue gas enters the second flue gas return cavity 12 through the flue gas pipe 10, it flows back to the reflux cavity through the second air guide pipe 13 to reheat and keep the hot water in the reflux cavity warm. This alleviates the problem of continuous heat loss during flue gas circulation. At the same time, the hot water in the return chamber can exchange heat with the cold water to a certain extent through the wall of the inner water storage cylinder 6, further improving the heating efficiency of the cold water, avoiding uneven temperature inside the boiler, improving the efficiency of heat energy utilization and improving the heat exchange balance.

[0026] Furthermore, it also includes a first smoke return chamber 8, which is arranged around the bottom of the water storage inner cylinder 6, and a second air guide pipe 13 is connected to the first smoke return chamber 8.

[0027] Specifically, the first return flue gas chamber 8 refers to a cavity structure surrounding the bottom of the inner water storage cylinder 6. It can be achieved by welding an annular metal shell or by integral molding, with the aim of providing a centralized heat exchange space for high-temperature flue gas. The connection between the second air guide pipe 13 and the first return flue gas chamber 8 can be achieved by flange connection or direct welding, with the aim of ensuring that the high-temperature flue gas can smoothly enter the first return flue gas chamber 8 for heat exchange.

[0028] In one embodiment, since water with a lower temperature has a higher density, it typically settles at the bottom of the inner water storage cylinder 6. By setting an annular first flue gas return chamber 8 at the bottom of the inner water storage cylinder 6 and connecting it to a second air guide pipe 13, the water at the bottom of the inner water storage cylinder 6 can be heated when high-temperature flue gas enters through the second air guide pipe 13. This enhances the utilization of the heat gradient during flue gas circulation. Simultaneously, the annular structure design allows the first flue gas return chamber 8 to uniformly conform to the outer wall of the inner water storage cylinder 6, thereby achieving a more balanced heat exchange effect and improving the stability and sufficiency of the overall heat energy conversion. Through the above technical solution, the heat distribution inside the boiler is optimized, and the thermal energy utilization efficiency is improved.

[0029] In addition, the top of the furnace body 1 is provided with a smoke hood 2, and the top of the smoke hood 2 is provided with a smoke vent 3. Several first air guide pipes 4 are provided on the side wall of the smoke hood 2. The first air guide pipes 4 pass through the furnace body 1 and are connected to the first smoke return chamber 8. The design of the smoke hood 2 provides a concentrated collection area for the flue gas. The smoke vent 3 ensures that the exchanged gas is discharged from the system, avoiding the retention of flue gas.

[0030] Example 2 Based on Example 1, see [link / reference] Figure 5 The number of first air guide pipes 4 corresponds to the number of second air guide pipes 13, and a heat exchange plate 14 is provided between the first air guide pipes 4 and the second air guide pipes 13.

[0031] Specifically, the correspondence between the number of first air tubes 4 and the number of second air tubes 13 means that the two are consistent in number. The purpose is to ensure that each first air tube 4 can form an effective heat exchange unit with a corresponding second air tube 13, and to avoid heat exchange blind spots caused by mismatch in number, such as by adopting a symmetrical distribution or array arrangement.

[0032] In this embodiment, the heat exchange plate 14 is directly connected to two air guide pipes. Utilizing its thermal conductivity, it rapidly transfers heat from the higher-temperature flue gas in the first air guide pipe 4 to the lower-temperature flue gas in the second air guide pipe 13, thus achieving lateral heat diffusion. Simultaneously, the heat exchange plate 14 expands the heat-receiving area of ​​the air guide pipes, further enhancing the heat preservation and heating effect on the hot water in the return cavity.

[0033] Preferably, the heat exchange plate 14 is arranged in an arc shape, and the two ends of the heat exchange plate 14 in the length direction are provided with sleeve holes 16 adapted to the first air guide pipe 4 and the second air guide pipe 13, and the surface of the heat exchange plate 14 is provided with a plurality of flow guide grooves 17.

[0034] It should be noted that the heat exchange plate 14 is a component used to connect the first air guide pipe 4 and the second air guide pipe 13 to achieve heat exchange. In practical applications, it can be made of metal materials, such as stainless steel or aluminum alloy, to ensure good thermal conductivity. The arc-shaped structure design can significantly increase the contact area between the heat exchange plate 14 and the surrounding medium, thereby improving heat exchange efficiency. The sleeve hole 16 can be understood as a through hole opened at both ends of the heat exchange plate 14. Its size and shape must match the first air guide pipe 4 and the second air guide pipe 13 to ensure a tight connection between them and avoid heat loss. The flow guide groove 17 refers to the groove structure machined on the surface of the heat exchange plate 14. Its purpose is to guide the flow of the medium to form local turbulence, thereby prolonging the contact time between the medium and the heat exchange plate 14 and increasing the effective heat exchange area.

[0035] In detail, the arc-shaped structure expands the contact area between the heat exchange plate 14 and the water flow, improving the overall heat transfer capacity. The guide groove 17 forms microchannels on the surface of the heat exchange plate 14, causing local eddies in the water flow. This flow characteristic not only prolongs the contact time between the water flow and the heat exchange plate 14, but also effectively suppresses heat attenuation.

[0036] Example 3 Based on Example 2, see [link / reference] Figure 6 The inner walls of both the first air guide tube 4 and the second air guide tube 13 are provided with a corrugated layer 18.

[0037] In this embodiment, the unevenness of the corrugated layer 18 increases the actual contact area of ​​the inner wall and improves the surface roughness, thereby enhancing the heat transfer process from the high-temperature flue gas to the pipe wall and forming a more efficient heat exchange system.

[0038] This application further proposes that the bottom of the furnace body 1 is provided with a combustion chamber 5, which is connected to the flue gas pipe 10.

[0039] Specifically, combustion chamber 5 refers to the chamber structure used for combustion of gas to generate high-temperature flue gas. It can be implemented using a closed combustion chamber made of high-temperature resistant materials, with the aim of providing a stable combustion environment for the gas and ensuring efficient flue gas generation. Flue gas pipe 10 refers to the pipe structure used to guide the flow of high-temperature flue gas. It can be implemented using a metal conduit, with the aim of effectively transporting the flue gas generated by combustion to the subsequent heat exchange structure.

[0040] The bottom of the furnace body 1 is equipped with a combustion chamber 5, which allows the high-temperature flue gas generated by combustion to flow upward in a vertical direction by utilizing the physical property of hot air rising naturally.

[0041] In addition, a plurality of heat-conducting rings 11 are arranged in an array along the length of the flue pipe 10. The heat-conducting rings 11 are annular structures set on the outer surface of the flue pipe 10, which can be made of metal, such as copper or aluminum, which have good thermal conductivity. The purpose of the design of the heat-conducting rings 11 being arranged in an array along the length of the flue pipe 10 is to ensure that heat exchange occurs uniformly along the entire length of the pipe and to avoid uneven heat exchange caused by large local temperature gradients.

[0042] By setting an array of heat-conducting rings 11 on the surface of the flue gas pipe 10, the heat exchange area of ​​the flue gas pipe 1 is expanded, enabling the heat of the high-temperature flue gas to be transferred to the water more efficiently. In addition, the setting of the heat-conducting rings 11 can also improve the flue gas flow state and enhance the turbulence effect, thereby further improving the heat exchange efficiency.

[0043] In summary, based on Embodiments 1 to 3, the working steps of the energy-saving mechanism of this gas-fired boiler are as follows: First, the combustion gas is fully combusted in the combustion chamber 5, and the resulting high-temperature flue gas flows vertically upward into the flue gas pipe 10. Cold water enters the water storage cylinder 6 through the water inlet 9, where the high-temperature flue gas initially heats the cold water within the flue gas pipe 10. The heated water rises to the top of the water storage cylinder 6 and enters the return chamber through the overflow trough 15. Simultaneously, the high-temperature flue gas enters the second return flue gas chamber 12 through the flue gas pipe 10, and then flows back to the return chamber through the second air guide pipe 13, providing secondary heating and insulation for the hot water in the return chamber.

[0044] Subsequently, under the action of the heat exchange plate 14, the temperature on the surface of the second air guide pipe 13 is conducted to the first air guide pipe 4, realizing the lateral diffusion of heat and further improving the heat preservation and heating effect on the hot water in the return cavity. Moreover, the corrugated layer 18 on the inner wall of the first air guide pipe 4 and the second air guide pipe 13 increases the actual contact area and surface roughness of the inner wall, enhancing the heat conduction from the high-temperature flue gas to the pipe wall. The heat-conducting rings 11 arrayed on the surface of the flue gas pipe 10 expand the heat exchange area of ​​the flue gas pipe 10, enabling the heat of the high-temperature flue gas to be transferred to the water more efficiently, while improving the flue gas flow state and enhancing the turbulence effect.

[0045] Finally, the exchanged gas enters the first gas guide pipe 4 from the first return chamber 8, and is then transmitted through the first gas guide pipe 4 to the exhaust hood 2 and discharged through the exhaust port 3 at the top. The entire process alleviates the problem of continuous heat loss during flue gas circulation, improves thermal energy utilization efficiency and heat exchange uniformity, and optimizes the heat distribution inside the boiler.

[0046] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy-saving mechanism for a gas-fired boiler, characterized in that, include: Furnace body (1); Water storage cylinder (7), the water storage cylinder (7) is located inside the furnace body (1), the water storage cylinder (7) is fitted with a water storage inner cylinder (6), and there is a gap between the outer wall of the water storage inner cylinder (6) and the inner wall of the water storage cylinder (7), which forms a reflux cavity; The second smoke chamber (12) is located at the top of the water storage cylinder (7). A predetermined gap is provided between the second smoke chamber (12) and the inner water storage cylinder (6), and an overflow groove (15) is formed by the predetermined gap. The flue pipe (10) is located inside the water storage inner cylinder (6) and is connected to the second return smoke chamber (12). The return cavity is provided with several second air guide pipes (13) distributed around the water storage inner cylinder (6), and the second air guide pipes (13) are all connected to the second smoke return cavity (12).

2. The energy-saving mechanism of the gas-fired boiler according to claim 1, characterized in that, It also includes a first smoke return chamber (8), which is arranged around the bottom of the water storage inner cylinder (6), and the second air guide pipe (13) is connected to the first smoke return chamber (8).

3. The energy-saving mechanism of the gas-fired boiler according to claim 1, characterized in that, The top of the furnace body (1) is provided with a smoke exhaust hood (2), and the top of the smoke exhaust hood (2) is provided with a smoke exhaust port (3). The side wall of the smoke exhaust hood (2) is provided with several first air guide pipes (4), which pass through the furnace body (1) and are connected to the first smoke return chamber (8).

4. The energy-saving mechanism of the gas-fired boiler according to claim 3, characterized in that, The number of the first air guide pipes (4) corresponds to the number of the second air guide pipes (13), and a heat exchange plate (14) is provided between the first air guide pipes (4) and the second air guide pipes (13).

5. The energy-saving mechanism of the gas-fired boiler according to claim 4, characterized in that, The heat exchange plate (14) is arranged in an arc shape. Both ends of the heat exchange plate (14) in the length direction are provided with sleeve holes (16) adapted to the first air guide pipe (4) and the second air guide pipe (13), and several flow guide grooves (17) are opened on the surface of the heat exchange plate (14).

6. The energy-saving mechanism of the gas-fired boiler according to claim 5, characterized in that, The inner walls of the first air guide tube (4) and the second air guide tube (13) are both provided with a corrugated layer (18).

7. The energy-saving mechanism of the gas-fired boiler according to claim 1, characterized in that, The bottom of the furnace body (1) is provided with a combustion chamber (5) and a water inlet (9). The combustion chamber (5) is connected to the flue gas pipe (10), and the water inlet (9) is connected to the water storage inner cylinder (6).

8. The energy-saving mechanism of the gas-fired boiler according to claim 7, characterized in that, The surface of the flue pipe (10) is fitted with several heat-conducting rings (11) arranged in an array along its length.

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