Flue gas condensation pipe for fuel gas heat supply

Abstract

The utility model discloses a flue gas condensation pipe for fuel gas heat supply, which comprises an inner pipe, the inner pipe comprises a high-temperature condensation pipe and a low-temperature condensation pipe which are communicated with each other, the low-temperature condensation pipe is spiral, the upper end of the high-temperature condensation pipe is connected with the upper end of the low-temperature condensation pipe, a straight water jacket is sleeved outside the high-temperature condensation pipe, and an annular water jacket is arranged outside the low-temperature condensation pipe. A first condensation cavity is formed between the outer wall of the high-temperature condensation pipe and the inner wall of the straight water jacket, and a second condensation cavity is formed between the outer wall of the low-temperature condensation pipe and the inner wall of the annular water jacket. According to the flue gas condensation pipe for fuel gas heat supply, the high-temperature condensation pipe and the spiral low-temperature condensation pipe are used as the inner pipe, the length of the condensation pipe is increased, flue gas waste heat recovery is improved, flue gas does not generate condensed water in the high-temperature condensation pipe, and condensed water is prevented from flowing back into a combustor to extinguish flames.

Description

Technical Field

[0001] This utility model relates to the field of heating equipment technology, and more specifically, to a flue gas condenser pipe for gas-fired heating. Background Technology

[0002] Gas heating is a common heating method. Gas heating equipment uses the heat energy generated by the combustion of gas to heat the heat transfer medium to meet the heating demand. Gases include natural gas, city gas, liquefied petroleum gas, and biogas. The flue gas produced by the combustion of gas in gas heating equipment also contains a large amount of heat energy. Flue gas condenser is used to recover the waste heat and water vapor in the flue gas.

[0003] Patent document CN 221301653 U discloses a condenser tube structure, including a tube body with internal threads on the inner wall, the tube body being S-shaped, and an inner tube inside the tube body. The inner tube is provided with several corrugated pipe sections along its length. Coolant to be cooled circulates inside the inner tube. Several heat dissipation fins are provided on the outer wall of the tube body. Reinforcing plates are provided between adjacent tube bodies. The improved condenser tube structure, by providing an inner tube inside the tube body and corrugated pipe sections on the inner tube, allows for improved cooling efficiency of the coolant vapor inside the inner tube during cooling. This is achieved by using the corrugated pipe sections on the inner tube to increase the heat exchange area.

[0004] Although the existing condenser tubes are designed in an S-shape, their length is still relatively short, resulting in low waste heat recovery from the flue gas.

[0005] Therefore, it is necessary to propose flue gas condenser tubes for gas-fired heating to solve the problems existing in the current technology. Utility Model Content

[0006] The utility model description section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0007] To address the aforementioned problems, this utility model provides a flue gas condenser for gas-fired heating, comprising an inner tube. The inner tube includes a high-temperature condenser and a low-temperature condenser that are interconnected. The low-temperature condenser is spiral-shaped. The upper end of the high-temperature condenser is connected to the upper end of the low-temperature condenser. A straight water jacket is fitted around the high-temperature condenser, and an annular water jacket is fitted around the low-temperature condenser. A first condensation cavity is formed between the outer wall of the high-temperature condenser and the inner wall of the straight water jacket, and a second condensation cavity is formed between the outer wall of the low-temperature condenser and the inner wall of the annular water jacket.

[0008] Preferably, the high-temperature condenser and the low-temperature condenser have the same inner diameter.

[0009] Preferably, it also includes a flue pipe connected to the high-temperature condenser pipe, the flue pipe being conical in shape, and the flue outlet at the upper end of the flue pipe being fixedly connected to the lower end of the high-temperature condenser pipe;

[0010] Both the high-temperature condensation section and the flue gas outlet have circular cross-sections.

[0011] Preferably, multiple smoke guide plates are fixedly installed around the smoke outlet on the side wall of the smoke inlet pipe. The smoke guide plates are curved panels and are arranged in a circular array with the center of the smoke outlet as the center.

[0012] Preferably, a first inlet pipe is fixedly installed on the upper part of the outer side wall of the straight water jacket, and a first outlet pipe is fixedly installed on the lower part of the outer side wall of the straight water jacket. Both the first inlet pipe and the first outlet pipe are connected to the first condensation chamber.

[0013] Preferably, a second liquid inlet pipe is fixedly installed on the upper annular surface of the annular water jacket, and a second liquid outlet pipe is fixedly installed on the lower annular surface of the annular water jacket. Both the second liquid inlet pipe and the second liquid outlet pipe are connected to the second condensation chamber.

[0014] Preferably, the lower end of the low-temperature condenser is fixed and connected to a flue pipe, and a condensate collection tank is provided at the bottom of the annular water jacket extending from the flue pipe. The condensate collection tank is connected to the flue pipe.

[0015] Preferably, a water outlet valve is installed in the middle of the bottom plate of the condensate collection tank.

[0016] Preferably, the outlet valve includes a valve body that is connected to the condensate collection tank. The valve body includes a cylindrical part and a conical part that are fixedly connected at the top and bottom. A float is movably installed inside the cylindrical part. A connecting rod is fixedly installed on the bottom surface of the float. A conical sealing part is fixedly installed at the lower end of the connecting rod. An outlet is opened at the bottom of the conical part. The sealing part is connected to the outlet.

[0017] Preferably, a guide rod is fixedly installed on the top of the float, a guide plate is horizontally installed on the upper part of the inner wall of the cylindrical part, a guide hole is opened at the position opposite to the guide rod on the guide plate, the guide rod is slidably installed in the guide hole, and a spring is sleeved on the outer circumference of the guide rod between the guide plate and the float. The upper end of the spring contacts the lower end face of the guide plate, and the lower end of the spring contacts the top of the float.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] The flue gas condenser tube for gas heating described in this utility model uses a high-temperature condenser tube and a spiral low-temperature condenser tube in the inner tube, which increases the length of the condenser tube and improves the recovery of waste heat from the flue gas. The flue gas will not produce condensate in the high-temperature condenser tube, preventing condensate from flowing back into the burner and extinguishing the flame.

[0020] The flue gas condenser tube for gas heating described in this utility model, other advantages, objectives and features of this utility model will be partly apparent from the following description, and partly understood by those skilled in the art through research and practice of this utility model. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of the flue gas condenser pipe for gas heating disclosed in this utility model.

[0023] Figure 2 This is a schematic diagram of the inner tube disclosed in this utility model;

[0024] Figure 3 This is a schematic diagram of the smoke inlet pipe from below, as disclosed in this utility model.

[0025] Figure 4 This is a cross-sectional structural schematic diagram of the smoke inlet pipe disclosed in this utility model;

[0026] Figure 5 This is a schematic diagram of the water outlet valve disclosed in this utility model. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0028] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0029] like Figure 1-5 As shown, a flue gas condenser for gas heating includes an inner pipe 1. The inner pipe 1 includes a high-temperature condenser 11 and a low-temperature condenser 12 that are interconnected. The low-temperature condenser 12 is spiral-shaped. The upper end of the high-temperature condenser 11 is connected to the upper end of the low-temperature condenser 12. A straight water jacket 2 is fitted outside the high-temperature condenser 11. An annular water jacket 3 is fitted outside the low-temperature condenser 12. A first condensation chamber 21 is formed between the outer wall of the high-temperature condenser 11 and the inner wall of the straight water jacket 2. A second condensation chamber 31 is formed between the outer wall of the low-temperature condenser 12 and the inner wall of the annular water jacket 3.

[0030] Furthermore, the high-temperature condenser 11 and the low-temperature condenser 12 have the same inner diameter.

[0031] Furthermore, it also includes a flue pipe 4 connected to the high-temperature condenser 11. The flue pipe 4 is conical, and the flue outlet 41 at the upper end of the flue pipe 4 is fixedly connected to the lower end of the high-temperature condenser 11.

[0032] Both the high-temperature condensation section 11 and the flue gas outlet 41 have circular cross-sections.

[0033] Furthermore, multiple smoke guide plates 42 are fixedly installed around the smoke outlet 41 on the side wall of the smoke inlet pipe 4. The smoke guide plates 42 are curved panels and are arranged in a circular array with the center of the smoke outlet 41 as the center.

[0034] Furthermore, a first inlet pipe 22 is fixedly installed on the upper part of the outer side wall of the straight water jacket 2, and a first outlet pipe 23 is fixedly installed on the lower part of the outer side wall of the straight water jacket 2. Both the first inlet pipe 22 and the first outlet pipe 23 are connected to the first condensation chamber 21.

[0035] Furthermore, a second liquid inlet pipe 32 is fixedly installed on the upper annular surface of the annular water jacket 3, and a second liquid outlet pipe 33 is fixedly installed on the lower annular surface of the annular water jacket 3. Both the second liquid inlet pipe 32 and the second liquid outlet pipe 33 are connected to the second condensation chamber 31.

[0036] Furthermore, the lower end of the low-temperature condenser tube 12 is fixed and connected to the flue pipe 5. The flue pipe 5 extends to the bottom of the annular water jacket 3 and is provided with a condensate collection tank 6. The condensate collection tank 6 is connected to the flue pipe 5.

[0037] Furthermore, a water outlet valve 8 is installed in the middle of the bottom plate of the condensate collection tank 6.

[0038] Furthermore, the outlet valve 8 includes a valve body that is connected to the condensate collection tank 6. The valve body includes a cylindrical part 81 and a conical part 82 that are fixedly connected at the top and bottom. A float ball 83 is movably disposed inside the cylindrical part 81. A connecting rod 84 is fixedly disposed on the bottom surface of the float ball 83. A conical sealing part 85 is fixedly disposed at the lower end of the connecting rod 84. An outlet 86 is opened at the bottom of the conical part 82. The sealing part 85 is connected to the outlet 86.

[0039] Furthermore, a guide rod 87 is fixedly installed on the top of the float 83, and a guide plate 88 is horizontally installed on the upper part of the inner wall of the cylindrical part 81. A guide hole is opened at the position opposite to the guide rod 87 on the guide plate 88. The guide rod 87 is slidably installed in the guide hole. A spring 89 is sleeved on the outer circumference of the guide rod 87 between the guide plate 88 and the float 83. The upper end of the spring 89 contacts the lower end face of the guide plate 88, and the lower end of the spring 89 contacts the top of the float 83.

[0040] The working principle of the above technical solution:

[0041] After the gas is burned in the combustion chamber, it enters the high-temperature condenser 11 and the low-temperature condenser 12 through the flue gas inlet pipe 4. The high-temperature condenser 11 is vertically arranged, and the low-temperature condenser 12 is spiral-shaped. The upper ends of the high-temperature condenser 11 and the low-temperature condenser 12 are connected. The flue gas first exchanges heat with the liquid medium in the straight water jacket in the high-temperature condenser 11. The water vapor in the flue gas will not condense in the high-temperature condenser, so no condensate will be generated in the high-temperature condenser. The upper ends of the high-temperature condenser and the low-temperature condenser are connected to each other, so that the condensate generated in the low-temperature condenser will gather at the lower part of the low-temperature condenser. The condensate will not flow back to the burner, which can prevent the condensate from extinguishing the flame. The low-temperature condenser 12 adopts a spiral structure, which increases the length of the low-temperature condenser and can recover more waste heat from the flue gas, thereby improving the waste heat recovery efficiency of the flue gas.

[0042] The flue gas outlet 41 at the upper end of the flue gas inlet pipe 4 is fixedly connected to and communicates with the lower end of the high-temperature condenser pipe 11. The flue gas inlet pipe 4 is conical with the large end of the cone facing downwards and is fixedly connected to the burner. The flue gas after combustion in the burner is collected into the high-temperature condenser pipe 11 through the flue gas inlet pipe. The flue gas inlet pipe 4 is located at the lower part of the high-temperature condenser pipe 11 and the low-temperature condenser pipe 12. In order to save space, the conical shape of the flue gas inlet pipe 4 is set as an asymmetrical shape. Alternatively, the high-temperature condenser pipe can be set inside the annular shape of the low-temperature condenser pipe. The flue gas inlet pipe can be set as a cone symmetrical about the central axis of the flue gas outlet. An array of arc-shaped plates is set on the inner wall of the flue gas inlet pipe 4 so that when the flue gas enters the high-temperature condenser pipe 11, the flue gas forms a vortex, increasing the contact time with the pipe wall of the high-temperature condenser pipe 11 and improving the heat exchange efficiency between the flue gas and the medium in the straight water jacket 3.

[0043] The straight water jacket 2 and the annular water jacket 3 are used for circulating the liquid medium to recover the residual heat in the flue gas. The liquid medium can be water. The liquid medium flows in from the first inlet pipe 22 and the second inlet pipe 32, and flows out from the first outlet pipe 23 and the second outlet pipe 33, respectively. The straight water jacket 2 is sealed to the high-temperature condenser pipe 11, and the annular water jacket 3 is sealed to the low-temperature condenser pipe.

[0044] A flue pipe 5 is installed at the lower part of the low-temperature condenser tube 12 to discharge the condensed flue gas. A water collection tank 6 is installed on the lower wall of the part of the flue pipe extending from the annular water jacket 3. The water collection tank 6 is connected to the flue pipe 5. The condensate generated in the low-temperature condenser tube 12 flows inward and collects in the water collection tank 6. A water outlet valve 8 is installed at the bottom of the water collection tank 6 and is connected to the water collection tank. When the amount of water entering the valve body reaches a certain amount, the buoyancy of the water pushes the float ball 83 upward. 3. Compression spring 89 causes guide rod 87 to slide upward. Float 83, via connecting rod 84, drives sealing part 85 upward, disengaging sealing part 85 from outlet 86. Condensate flows out from outlet 86. As the amount of condensate decreases, the buoyancy on float 83 decreases, and float 83 moves downward under the spring force, causing sealing part 85 to block outlet 86, preventing further condensate discharge. This cycle continues, allowing condensate to be continuously discharged. A guide channel can be installed to collect the discharged condensate. When flue gas flows in flue pipe 5, it reduces the pressure in water collection tank and outlet valve. Spring 89 also prevents the outlet valve seal from opening due to pressure reduction, thus preventing air from entering flue pipe from outlet 86. By setting an appropriate float volume and spring force, the spring 89 can prevent the valve from opening due to low pressure in the water collection tank caused by the flow of smoke in the smoke outlet pipe 5, and can also move upward when the float 83 is subjected to a certain amount of buoyancy from the condensate to release the condensate. It can also prevent smoke or air from passing through the water outlet valve.

[0045] The beneficial effects of the above technical solution are as follows:

[0046] The flue gas condenser tube for gas heating described in this utility model uses a high-temperature condenser tube and a spiral low-temperature condenser tube in the inner tube, which increases the length of the condenser tube and improves the recovery of waste heat from the flue gas. The flue gas will not produce condensate in the high-temperature condenser tube, preventing condensate from flowing back into the burner and extinguishing the flame.

[0047] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0048] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A flue gas condenser pipe for gas-fired heating, characterized in that, The device includes an inner tube (1), which includes a high-temperature condenser tube (11) and a low-temperature condenser tube (12) that are interconnected. The low-temperature condenser tube (12) is spiral-shaped. The upper end of the high-temperature condenser tube (11) is connected to the upper end of the low-temperature condenser tube (12). A straight water jacket (2) is fitted outside the high-temperature condenser tube (11), and an annular water jacket (3) is fitted outside the low-temperature condenser tube (12). A first condensation chamber (21) is formed between the outer wall of the high-temperature condenser tube (11) and the inner wall of the straight water jacket (2), and a second condensation chamber (31) is formed between the outer wall of the low-temperature condenser tube (12) and the inner wall of the annular water jacket (3).

2. The flue gas condenser pipe for gas heating according to claim 1, characterized in that, The high-temperature condenser (11) and the low-temperature condenser (12) have the same inner diameter.

3. The flue gas condenser pipe for gas heating according to claim 1, characterized in that, It also includes a flue (4) connected to the high-temperature condenser (11). The flue (4) is conical and the flue outlet (41) at the upper end of the flue (4) is fixedly connected to the lower end of the high-temperature condenser (11). Both the high-temperature condenser tube (11) and the flue gas outlet (41) have circular cross-sections.

4. The flue gas condenser pipe for gas heating according to claim 3, characterized in that, Multiple smoke guide plates (42) are fixedly installed around the smoke outlet (41) on the side wall of the smoke inlet pipe (4). The smoke guide plates (42) are curved panels and are arranged in a circular array with the center of the smoke outlet (41) as the center.

5. The flue gas condenser pipe for gas heating according to claim 1, characterized in that, A first inlet pipe (22) is fixedly installed on the upper part of the outer side wall of the straight water jacket (2), and a first outlet pipe (23) is fixedly installed on the lower part of the outer side wall of the straight water jacket (2). Both the first inlet pipe (22) and the first outlet pipe (23) are connected to the first condensing chamber (21).

6. The flue gas condenser pipe for gas heating according to claim 5, characterized in that, A second liquid inlet pipe (32) is fixedly installed on the upper annular surface of the annular water jacket (3), and a second liquid outlet pipe (33) is fixedly installed on the lower annular surface of the annular water jacket (3). Both the second liquid inlet pipe (32) and the second liquid outlet pipe (33) are connected to the second condensation chamber (31).

7. The flue gas condenser pipe for gas heating according to claim 1, characterized in that, The lower end of the low-temperature condenser tube (12) is fixed and connected to the flue pipe (5). The flue pipe (5) extends to the bottom of the annular water jacket (3) and a condensate collection tank (6) is provided. The condensate collection tank (6) is connected to the flue pipe (5).

8. The flue gas condenser pipe for gas heating according to claim 7, characterized in that, A water outlet valve (8) is installed in the middle of the bottom plate of the condensate collection tank (6).

9. The flue gas condenser pipe for gas heating according to claim 8, characterized in that, The outlet valve (8) includes a valve body, which is connected to the condensate collection tank (6). The valve body includes a cylindrical part (81) and a conical part (82) that are fixedly connected at the top and bottom. A float ball (83) is movably arranged inside the cylindrical part (81). A connecting rod (84) is fixedly arranged on the bottom surface of the float ball (83). A conical sealing part (85) is fixedly arranged at the lower end of the connecting rod (84). An outlet (86) is opened at the bottom of the conical part (82). The sealing part (85) is connected to the outlet (86).

10. The flue gas condenser pipe for gas heating according to claim 9, characterized in that, A guide rod (87) is fixedly installed on the top of the float (83). A guide plate (88) is horizontally installed on the upper part of the inner wall of the cylindrical part (81). A guide hole is opened at the position opposite to the guide rod (87) on the guide plate (88). The guide rod (87) is slidably installed in the guide hole. A spring (89) is sleeved on the outer circumference of the guide rod (87) between the guide plate (88) and the float (83). The upper end of the spring (89) contacts the lower end face of the guide plate (88), and the lower end of the spring (89) contacts the top of the float (83).

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