Flue gas recirculation device of gas-fired boiler

Abstract

The utility model discloses a gas-fired boiler flue gas recirculation device, which relates to the technical field of flue gas circulation and comprises a reaction barrel, a built-in pipe group is arranged in the reaction barrel, a water outlet pipe is fixedly connected to the outer wall of the reaction barrel close to the top end, and a water inlet pipe is fixedly connected to the outer wall of the reaction barrel close to the bottom end. The built-in pipe group comprises a built-in circulating pipe, the air inlet end of the built-in circulating pipe is fixedly connected with an auxiliary adapting pipe, the air outlet end of the built-in circulating pipe is fixedly connected with a connecting pipe, and a driving assembly for driving the built-in pipe group to circulate is arranged at the top of the reaction barrel. According to the utility model, the built-in pipe group is arranged in the reaction barrel, and smoke in the built-in circulating pipe can exchange heat with cold water through the pipe wall, so that the smoke can be cooled for recycling; meanwhile, the number of the built-in circulating pipes is large, the built-in circulating pipes are combined in an annular array mode, the contact area of flue gas and cold water is increased, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of flue gas recirculation technology, specifically to a flue gas recirculation device for a gas-fired boiler. Background Technology

[0002] Gas-fired boilers primarily use natural gas as fuel and are widely used in industrial production and residential heating. As my country's environmental protection requirements become increasingly stringent, the limits on nitrogen oxide emissions from gas-fired boilers are also becoming more stringent. Utilizing gas-fired boilers to burn these industrial exhaust gases can reduce environmental pollution and effectively utilize energy.

[0003] The existing technology still has the following problems:

[0004] First, existing gas-fired boilers typically produce a large amount of flue gas that is released into the atmosphere. This flue gas carries away a significant amount of heat, leading to energy waste. Furthermore, when using a gas-fired boiler for an extended period, the large amount of hot steam can affect the boiler's performance, and the heat released from the flue gas cannot be utilized efficiently. Utility Model Content

[0005] The purpose of this invention is to provide a flue gas recirculation device for a gas-fired boiler to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A flue gas recirculation device for a gas-fired boiler includes a reaction tank, an internal pipe assembly, an outlet pipe fixedly connected to the outer wall near the top of the reaction tank, and an inlet pipe fixedly connected to the outer wall near the bottom of the reaction tank.

[0008] The built-in pipe assembly includes a built-in circulation pipe, the air inlet end of which is fixedly connected to an auxiliary receiving pipe, and the air outlet end of which is fixedly connected to a connecting pipe.

[0009] The top of the reaction vessel is equipped with a drive assembly for driving the built-in tube assembly to circulate, and the drive assembly includes a servo motor.

[0010] In this technical solution, the inlet and outlet pipes can be circulated by a circulation device, which may include a circulation pump. One end of the circulation pump is connected to the outlet pipe, and the other end is connected to the inlet pipe. After the circulation pump is turned on, the water flowing out of the outlet pipe is pressurized and re-flows into the inlet pipe, realizing continuous circulation of water in the reaction tank. This ensures that the water temperature in the reaction tank remains relatively stable and maintains good heat exchange conditions.

[0011] A further improvement of this utility model is that: a drive gear is fixedly connected to the output end of the servo motor, a receiving gear meshes with the outer wall of the drive gear, and the inner wall of the receiving gear is fixedly connected to the outer wall of the auxiliary receiving pipe.

[0012] A further improvement of this utility model is that: the top end of the auxiliary support pipe is fixedly connected to an air intake pipe through a rotary sealing joint, and the bottom end of the connecting pipe is fixedly connected to an exhaust pipe through a rotary sealing joint.

[0013] The above technical solution ensures the sealing of the connection between the inlet pipe, the exhaust pipe and the auxiliary receiving pipe and connecting pipe, preventing flue gas leakage. It also ensures that the normal transport of flue gas is not affected when the auxiliary receiving pipe and the built-in circulation pipe rotate, thus ensuring the stable operation of the entire device. It is a key component for ensuring flue gas circulation and normal equipment operation.

[0014] A further improvement of this utility model is that a bushing is fixedly connected to the outer wall of the auxiliary support pipe, and the bushing is rotatably connected to the top of the reaction tank.

[0015] A further improvement of this utility model is that the outer wall of the servo motor is fixedly connected to the top of the reaction vessel via a mounting bracket.

[0016] A further improvement of this utility model is that a support leg is fixedly connected to the bottom surface of the reaction tank.

[0017] Using the above technical solution, the support legs can be made of high-strength steel to ensure stable support of the reaction vessel and its internal equipment. Depending on the size and weight of the reaction vessel, four support legs can be installed, arranged in a rectangle at the four corners of the bottom of the reaction vessel. The height of these legs is determined based on the actual installation environment and ease of operation.

[0018] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0019] This utility model provides a flue gas recirculation device for a gas-fired boiler. By setting up an internal pipe assembly in the reaction tank, the flue gas in the internal circulation pipes can exchange heat with cold water through the pipe wall to achieve cooling treatment of the flue gas for recycling. At the same time, the large number of internal circulation pipes arranged in a ring array increases the contact area between the flue gas and the cold water, thereby improving the heat exchange efficiency.

[0020] This utility model provides a flue gas recirculation device for a gas-fired boiler. The device is equipped with a drive component, in which a servo motor drives a drive gear, which in turn drives a receiving gear to rotate the auxiliary receiving pipe and the built-in circulation pipe. This makes the contact between the cold water and the wall of the built-in circulation pipe more uniform, achieving a uniform cooling effect and improving the stability and reliability of the entire flue gas recirculation system. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a top view of the structure of this utility model;

[0023] Figure 3 This is a schematic diagram showing the structural details of the reaction vessel of this utility model;

[0024] Figure 4 This is a schematic diagram of the built-in tube assembly structure of this utility model.

[0025] In the diagram: 1. Reaction tank; 2. Inlet pipe; 3. Outlet pipe; 4. Support leg; 5. Servo motor; 6. Drive gear; 8. Rotary sealing joint; 9. Receiving gear; 10. Air inlet pipe; 11. Internal pipe assembly; 12. Bushing; 13. Auxiliary receiving pipe; 14. Internal circulation pipe; 15. Connecting pipe; 16. Exhaust pipe. Detailed Implementation

[0026] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The present invention will be further described in detail below with reference to embodiments:

[0028] Example 1

[0029] like Figure 1-4 As shown, this utility model provides a gas boiler flue gas recirculation device, including a reaction tank 1, an internal pipe assembly 11 is provided inside the reaction tank 1, a water outlet pipe 3 is fixedly connected to the outer wall near the top of the reaction tank 1, and a water inlet pipe 2 is fixedly connected to the outer wall near the bottom of the reaction tank 1.

[0030] The built-in pipe assembly 11 includes a built-in circulation pipe 14, with an auxiliary receiving pipe 13 fixedly connected to the air inlet end of the built-in circulation pipe 14 and a connecting pipe 15 fixedly connected to the air outlet end of the built-in circulation pipe 14.

[0031] The top of the reaction vessel 1 is equipped with a drive assembly for driving the built-in tube assembly 11 to circulate. The drive assembly includes a servo motor 5.

[0032] The output end of the servo motor 5 is fixedly connected to a drive gear 6, and the outer wall of the drive gear 6 is meshed with a receiving gear 9. The inner wall of the receiving gear 9 is fixedly connected to the outer wall of the auxiliary receiving pipe 13.

[0033] Example 2

[0034] like Figure 1-4 As shown, based on Embodiment 1, this utility model provides a technical solution: Preferably, the top end of the auxiliary receiving pipe 13 is fixedly connected to the air inlet pipe 10 via a rotary sealing joint 8, and the bottom end of the connecting pipe 15 is fixedly connected to the exhaust pipe 16 via the rotary sealing joint 8. The rotary sealing joint 8 can ensure the sealing of the connection between the air inlet pipe 10, the exhaust pipe 16 and the auxiliary receiving pipe 13 and the connecting pipe 15, preventing flue gas leakage; it can also ensure that the normal delivery of flue gas is not affected when the auxiliary receiving pipe 13 and the built-in circulation pipe 14 rotate, ensuring the stable operation of the entire device. It is a key component for ensuring flue gas circulation and normal equipment operation.

[0035] A bushing 12 is fixedly connected to the outer wall of the auxiliary support pipe 13, and the bushing 12 is rotatably connected to the top of the reaction vessel 1.

[0036] The outer wall of the servo motor 5 is fixedly connected to the top of the reaction tank 1 via a mounting bracket, and the bottom surface of the reaction tank 1 is fixedly connected to the support leg 4.

[0037] The working principle of the flue gas recirculation device for this gas-fired boiler will be explained in detail below.

[0038] like Figure 1-4 As shown, during use, cold water is filled into the reaction tank 1 through the inlet pipe 2. The inlet pipe 2 and the outlet pipe 3 can be circulated by a circulation device. The circulation device may include a circulation pump, one end of which is connected to the outlet pipe 3 and the other end to the inlet pipe 2. After the circulation pump is turned on, the water flowing out of the outlet pipe 3 is pressurized and flows back into the inlet pipe, realizing continuous circulation of water in the reaction tank 1, ensuring that the water temperature in the reaction tank 1 remains relatively stable and maintaining good heat exchange conditions.

[0039] The flue gas from the gas-fired boiler is then conveyed to the inlet pipe 10, and gradually transported through the inlet pipe 10 to the built-in circulation pipe 14 connected to the auxiliary receiving pipe 13. The flue gas in the built-in circulation pipe 14 exchanges heat with cold water through its pipe wall, thus cooling it down and achieving flue gas recycling. When the water temperature is too high, water is drained through the outlet pipe 3, and the above process is repeated, thereby achieving recirculation of the flue gas within the gas-fired boiler.

[0040] When flue gas is introduced into the built-in pipe assembly 11, the servo motor 5 is started, which drives the receiving gear 9 to rotate through the drive gear 6. The receiving gear 9 then drives the auxiliary receiving pipe 13 to rotate the built-in circulation pipe 14, making the contact between the cold water and the wall of the built-in circulation pipe 14 more uniform, thereby achieving a uniform cooling effect.

[0041] The number of built-in circulation tubes 14 is multiple, and the multiple sets of built-in circulation tubes 14 are combined together in a ring array.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The present invention has been described in detail above, but modifications or improvements can be made based on it, which will be apparent to those skilled in the art. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A gas boiler flue gas recirculation device comprising a reaction bucket (1), characterized in that: The inside of the reaction bucket (1) is provided with an internal pipe group (11), the outer wall of the reaction bucket (1) near the top end is fixedly connected with a water outlet pipe (3), and the outer wall of the reaction bucket (1) near the bottom end is fixedly connected with a water inlet pipe (2); The internal pipe group (11) comprises an internal circulation pipe (14), the air inlet end of the internal circulation pipe (14) is fixedly connected with an auxiliary receiving pipe (13), and the air outlet end of the internal circulation pipe (14) is fixedly connected with a connecting pipe (15); The top of the reaction bucket (1) is provided with a driving assembly for driving the internal pipe group (11) to circulate, and the driving assembly comprises a servo motor (5).

2. A gas boiler flue gas recirculation device according to claim 1, characterised in that: The output end of the servo motor (5) is fixedly connected with a driving gear (6), the outer wall of the driving gear (6) is engaged with a receiving gear (9), and the inner wall of the receiving gear (9) is fixedly connected with the outer wall of the auxiliary receiving pipe (13).

3. A gas boiler flue gas recirculation device according to claim 1, characterized in that: The top end of the auxiliary receiving pipe (13) is fixedly connected with an air inlet pipe (10) through a rotary sealing joint (8), and the bottom end of the connecting pipe (15) is fixedly connected with an exhaust pipe (16) through a rotary sealing joint (8).

4. A gas boiler flue gas recirculation device according to claim 1, characterized in that: The outer wall of the auxiliary receiving pipe (13) is fixedly connected with a shaft sleeve (12), and the shaft sleeve (12) is rotationally connected to the top of the reaction bucket (1).

5. A flue gas recirculation device for a gas-fired boiler as set forth in claim 1, characterized in that: The outer wall of the servo motor (5) is fixedly connected to the top of the reaction bucket (1) through a mounting frame.

6. A gas boiler flue gas recirculation device according to claim 1, characterized in that: The bottom surface of the reaction bucket (1) is fixedly connected with a supporting leg (4).

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