High-temperature flue gas waste heat recycling system

Abstract

The utility model provides a high-temperature flue gas waste heat recycling system which comprises a first pipe section, a second pipe section and a third pipe section, one end of the first pipe section is a high-temperature flue gas inlet, a water tank is fixedly arranged outside the first pipe section in a surrounding mode, and the water tank is further connected with a water inlet pipe and a water outlet pipe. One end of the second pipe section is fixedly connected and communicated with the end, deviating from the high-temperature flue gas inlet, of the first pipe section, and the end, deviating from the first pipe section, of the second pipe section is a high-temperature flue gas outlet; the middle section of the preheating pipe is arranged in the second pipe section in the axial direction of the second pipe section, and the two ends of the preheating pipe fixedly extend out of the second pipe section. According to the utility model, the preheating of the high-temperature flue gas is fully utilized, and the problem that part of waste heat is still not fully utilized after the water is preheated by the high-temperature flue gas in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-temperature flue gas waste heat recovery devices, and in particular to a high-temperature flue gas waste heat recovery and utilization system. Background Art

[0002] The steam generator is one of the energy sources of the production workshop, such as using a boiler to generate steam. In the prior art, a large amount of high-temperature flue gas will be generated during the operation of the steam generator. In order to improve the efficiency of energy utilization, these high-temperature flue gases can generally be used to heat water to increase the temperature of the water, that is, to preheat the water. The preheated water is then introduced into the steam generator, and the heat energy required to generate steam can be appropriately reduced, thereby improving the overall energy utilization rate. In the actual operation process, the high-temperature flue gas preheats the water and then directly transports it to the high-temperature flue gas treatment device for purification and discharge. This avoids pollution to the external environment. However, the high-temperature flue gas after the water is preheated still contains some waste heat, which is not fully utilized, resulting in energy waste to a certain extent. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a high-temperature flue gas waste heat recovery and utilization system, which solves the problem in the prior art that some waste heat is not fully utilized after the high-temperature flue gas preheats water.

[0004] According to an embodiment of the utility model, a high-temperature flue gas waste heat recovery and utilization system comprises:

[0005] A first pipe section, one end of which is a high-temperature flue gas inlet, and a water tank is fixedly arranged around the first pipe section, and the water tank is also connected to a water inlet pipe and a water outlet pipe;

[0006] A second pipe section, one end of the second pipe section is fixedly connected to and communicates with an end of the first pipe section away from the high-temperature flue gas inlet, and an end of the second pipe section away from the first pipe section is a high-temperature flue gas outlet;

[0007] The preheating tube has a middle section arranged axially inside the second tube section and two ends thereof respectively fixedly extending outside the second tube section.

[0008] In the above embodiment, a structure for preheating water is provided on the initial section of the pipeline for leading out the high-temperature flue gas, similar to the prior art. The difference is that a structure for heating air is further provided in the later section to preheat the air so that the temperature of the air is appropriately increased, and then the air is introduced into the steam generating device to provide oxygen, which can improve the combustion efficiency, thereby further improving the energy utilization efficiency, making fuller use of the preheating of the high-temperature flue gas, and solving the problem in the prior art that some residual heat is not fully utilized after the high-temperature flue gas preheats the water.

[0009] Furthermore, it further includes a support frame, and the bottom surface of the water tank is fixedly connected to the support frame.

[0010] Furthermore, mounting rings are respectively and fixedly connected to a pair of opposite side walls of the water tank, and the two mounting rings are fixedly sleeved outside the first pipe section.

[0011] Furthermore, the first pipe section and the second pipe section are connected by a flange.

[0012] Furthermore, the preheating pipe includes an air inlet pipe and an air outlet pipe fixedly connected to the second pipe section, and a first connection section, a spiral section and a second connection section that are sequentially located between the air inlet pipe and the air outlet pipe and are located inside the second pipe section.

[0013] Furthermore, the preheating pipe includes an air inlet pipe and an air outlet pipe fixedly connected to the second pipe section, and a mounting section located between the air inlet pipe and the air outlet pipe and inside the second pipe section. A preheating disk is fixedly connected to the mounting section. A preheating cavity that is communicated with both the air inlet pipe and the air outlet pipe through the mounting section is arranged inside the preheating disk. A communicating pipe that penetrates through the preheating cavity and is communicated with the second pipe section is also fixedly connected to the preheating disk.

[0014] Furthermore, the communicating pipe includes a plurality of pipes that surround the mounting section.

[0015] Furthermore, the inner diameter of one end of the communicating pipe close to the first pipe section is larger than that of the other end.

[0016] Furthermore, an annular groove is recessed on the inner wall of the second pipe section, and the outer edge of the preheating disk is received in the annular groove.

[0017] Compared with the prior art, the present utility model has the following beneficial effects:

[0018] By adding a preheating pipe in the second pipe section behind the water tank to preheat the air, the temperature of the air is appropriately increased, and then it is introduced into the steam generating device to provide oxygen. In this way, the combustion efficiency can be improved, thereby further improving the energy utilization efficiency and making more full use of the preheating of the high-temperature flue gas, and solving the problem that there is still some residual heat that has not been fully utilized after the high-temperature flue gas preheats the water in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0020] Figure 2 is a structure of a preheating pipe in an embodiment of the present utility model;

[0021] Figure 3 is Figure 1 a partially enlarged schematic diagram of the local structure at A in

[0022] In the above drawings:

[0023] The first pipe section 1, the water tank 2, the water inlet pipe 3, the water outlet pipe 4, the second pipe section 5, the air inlet pipe 6, the air outlet pipe 7, the first connecting section 8, the spiral section 9, the second connecting section 10, the installation section 11, the preheating plate 12, the preheating chamber 13, the connecting pipe 14, the support frame 15, the installation ring 16, and the flange 17. DETAILED DESCRIPTION

[0024] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] 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", "axial", "radial", "circumferential" and the like 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 referred device or element 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.

[0026] In an exemplary embodiment, Figure 1 , 2 As shown, this embodiment provides a high-temperature flue gas waste heat recovery and utilization system, which includes:

[0027] A first pipe section 1, one end of which is a high-temperature flue gas inlet, and a water tank 2 is fixedly arranged outside the first pipe section 1, and the water tank 2 is also connected to a water inlet pipe 3 and a water outlet pipe 4. The high-temperature flue gas inlet is connected to the exhaust port of the steam generating device, and the high-temperature flue gas is introduced, and then enters the first pipe section 1, passes through the water tank 2 through the first pipe section 1, so as to preheat the water in the water tank 2, and the water inlet pipe 3 and the water outlet pipe 4 are used to introduce and export water;

[0028] A second pipe section 5, one end of which is fixedly connected to and communicates with an end of the first pipe section 1 away from the high-temperature flue gas inlet, and an end of the second pipe section 5 away from the first pipe section 1 is a high-temperature flue gas outlet. The high-temperature flue gas passing through the first pipe section 1 continues to enter the second pipe section 5, and is finally introduced into a subsequent flue gas purification device through the high-temperature flue gas outlet for purification, and then discharged;

[0029] The preheating pipe has its middle section axially arranged within the second pipe section 5 along the axial direction of the second pipe section 5, with both ends fixedly extending outside the second pipe section 5. One end of the preheating pipe is for introducing air. After entering the preheating pipe, the air is heated by the high-temperature flue gas in the part of the preheating pipe located within the second pipe section 5, and then is introduced into the steam generating device through the other end of the preheating pipe to provide oxygen. A pump body can also be added to the preheating pipe to provide power to enable the air to smoothly pass through the preheating pipe.

[0030] In the above-mentioned embodiment, a structure for preheating water is provided in the initial pipe section where the high-temperature flue gas is discharged, similar to the prior art. The difference is that a structure for heating air is further added in the subsequent section to preheat the air, so that the temperature of the air is appropriately increased, and then it is introduced into the steam generating device to provide oxygen. This can improve the combustion efficiency, further improve the energy utilization efficiency, make more full use of the preheating of the high-temperature flue gas, and solve the problem that there is still some waste heat not fully utilized after the high-temperature flue gas preheats water in the prior art. Specifically, the preheating pipe provided can be a blower at the air inlet end or an exhaust fan at the air outlet section. The air inlet end can be arranged away from the first pipe section 1, and the corresponding air outlet section can be arranged close to the first pipe section 1.

[0031] In a more specific solution, the preheating pipe provided includes an air inlet pipe 6 and an air outlet pipe 7 (i.e., the air inlet end and the air outlet end) fixedly connected to the second pipe section 5, and a first connecting section 8, a spiral section 9, and a second connecting section 10 that are successively located between the air inlet pipe 6 and the air outlet pipe 7 and within the second pipe section 5. The air has a longer flow path in the spiral section 9, so that it can stay in the second pipe section 5 for a longer time to achieve a better heating effect.

[0032] In another feasible exemplary solution, such as Figure 1 、 3As shown, the preheating pipe may further include an intake pipe 6 and an exhaust pipe 7 fixedly connected to the second pipe section 5, and an installation section 11 located between the intake pipe 6 and the exhaust pipe 7 and within the second pipe section 5. A preheating disc 12 is also fixedly connected to the installation section 11. A preheating cavity 13 is provided in the preheating disc 12 and is communicated with both the intake pipe 6 and the exhaust pipe 7 through the installation section 11. A communicating pipe 14 that passes through the preheating cavity 13 and is communicated with the second pipe section 5 is also fixedly connected to the preheating disc 12. The provided installation section 11, preheating disc 12, and the preheating cavity 13 therein can also correspondingly increase the contact efficiency between air and high-temperature flue gas, thereby achieving a better heating effect. Among them, the provided communicating pipe 14 allows high-temperature flue gas to pass through, and the air in the preheating cavity 13 surrounds the communicating pipe 14 and can contact the high-temperature flue gas more fully, thereby realizing heating more efficiently. More specifically, the communicating pipe 14 includes a plurality of pipes surrounding the installation section 11. The inner diameter of one end of the communicating pipe 14 close to the first pipe section 1 is larger than that of the other end. In this way, the high-temperature flue gas passes through the preheating cavity 13 in a surrounding manner through the communicating pipe 14, which can heat the air more efficiently. At the same time, when the high-temperature flue gas passes through the communicating pipe 14;

[0033] Furthermore, an annular groove is recessed on the inner wall of the second pipe section 5, and the outer edge of the preheating disc 12 is received in the annular groove, which makes the preheating disc 12 more stable.

[0034] As Figure 1 shown, in a more detailed exemplary solution, the system further includes a support frame 15. The bottom surface of the water tank 2 is fixedly connected to the support frame 15. The support frame 15 enables the water tank 2 to be supported more stably. Mounting rings 16 are respectively fixedly connected to a pair of opposite side walls of the water tank 2. The two mounting rings 16 are fixedly sleeved outside the first pipe section 1, that is, the mounting rings 16 are provided at the place where the first pipe section 1 passes through the water tank 2 to enhance the connection stability. More specifically, the first pipe section 1 and the second pipe section 5 are connected by a flange 17.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A high-temperature flue gas waste heat recovery and utilization system, characterized in that, include: A first pipe section, one end of which is a high-temperature flue gas inlet, and a water tank is fixedly arranged around the first pipe section, and the water tank is also connected to a water inlet pipe and a water outlet pipe; a second pipe section, one end of the second pipe section being fixedly connected to and in communication with one end of the first pipe section away from the high-temperature flue gas inlet, and one end of the second pipe section away from the first pipe section being a high-temperature flue gas outlet; A preheating tube, wherein the middle section of the preheating tube is axially arranged inside the second tube section, and both ends are fixedly extended outside the second tube section.

2. The high-temperature flue gas waste heat recovery and utilization system according to claim 1, wherein It also includes a support frame, and the bottom surface of the water tank is fixedly connected to the support frame.

3. The high-temperature flue gas waste heat recovery and utilization system according to claim 1, wherein, A pair of opposite side walls of the water tank are respectively fixedly connected with mounting rings, and the two mounting rings are fixedly sleeved outside the first pipe section.

4. The high-temperature flue gas waste heat recovery and utilization system according to claim 1, wherein The first pipe section and the second pipe section are connected via a flange.

5. The high-temperature flue gas waste heat recovery and utilization system according to any one of claims 1-4, characterized in that The preheating pipe includes an air inlet pipe and an air outlet pipe fixedly connected to the second pipe section, and a first connecting section, a spiral section and a second connecting section sequentially located between the air inlet pipe and the air outlet pipe and inside the second pipe section.

6. The high-temperature flue gas waste heat recovery and utilization system according to any one of claims 1-4, characterized in that, The preheating pipe includes an air inlet pipe and an air outlet pipe fixedly connected to the second pipe section, and a mounting section located between the air inlet pipe and the air outlet pipe and located in the second pipe section, the mounting section is also fixedly connected to a preheating disk, a preheating cavity is provided in the preheating disk and is connected to the air inlet pipe and the air outlet pipe through the mounting section, and a connecting pipe is also fixedly connected to the preheating disk and is connected to the second pipe section through the preheating cavity.

7. The high-temperature flue gas waste heat recovery and utilization system according to claim 6, characterized in that The connecting pipe includes a plurality of connecting pipes surrounding the outside of the installation section.

8. The high-temperature flue gas waste heat recovery and utilization system according to claim 6, characterized in that, The inner diameter of one end of the connecting pipe close to the first pipe section is larger than that of the other end.

9. The high-temperature flue gas waste heat recovery and utilization system according to claim 6, characterized in that, An annular groove is recessed on the inner wall of the second pipe section, and the outer edge of the preheating plate is accommodated in the annular groove.

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