Heat exchanger finned tube structure of heat treatment furnace burner
By pressurizing the combustion air in the heat exchanger fin tube and designing the corrugated outer fin and conical hole structure, the problem of easy blockage of the outer fin is solved, achieving uniform distribution of exhaust gas and efficient combustion.
Patent Information
- Application Number
- CN202421476001.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-06-26
AI Technical Summary
The outer fin structure of the existing heat exchanger fin tube is slow to divert and the exhaust gas pressure is low, which leads to impurities that tend to stick to and cause the passage to be blocked.
The inner diameter of the gas section is designed to be smaller than the flow guide part, and the exhaust gas is pressurized after the boosting of combustion air. The outer fins are corrugated structure to guide the vortex, the cone hole is aligned with the inlet of the combustion furnace, the flow guide the fuel assisting gas flow, and the outer fin array is arranged alternately at intervals.
Increase exhaust gas pressure, avoid impurities sticking, reduce channel blockage, and enhance combustion efficiency and life.
Smart Images
Figure CN223165563U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the combustion heat exchange technology of a burner for a heat treatment furnace, in particular to a finned tube structure of a heat exchanger for a burner of a heat treatment furnace. Background Art
[0002] The burner is a key device for heating and raising the temperature of a heat treatment furnace, controlling the temperature of the furnace chamber; the heat exchanger is the core component of the burner, which can improve the heating efficiency of the heating furnace, extend the service life of the burner, reduce waste and save costs. The outer fins of the finned tube of the heat exchanger in the prior art are usually of a spiral structure. However, the outer fins of this structure have slow flow guiding, and the air flow pressure of the waste gas discharged by the burner in the prior art is low. Therefore, the pressure of the reflux waste gas will be further reduced, and the impurities in the waste gas are easily adhered to the outer fins with a higher temperature. Long-term accumulation is likely to cause blockage of the channels between the outer fins. Summary of the Invention
[0003] In view of the above problems, the utility model provides a finned tube structure of a heat exchanger that can avoid adhesion and blockage of reflux waste gas on the outer fins. The specific scheme is as follows:
[0004] A finned tube structure of a heat exchanger for a burner of a heat treatment furnace includes a communicating guiding part and a gas part. A combustion air pipe is connected to the guiding part, and a combustion furnace is installed in the gas part. The inner diameter of the pipe of the gas part is smaller than that of the guiding part, so that the air pressure is increased after the combustion air is introduced into the gas part, thereby increasing the waste gas pressure discharged by the combustion furnace.
[0005] A plurality of outer fins arranged circumferentially are provided on the outer wall of the finned tube of the heat exchanger. The outer fins are arranged along the axial direction of the finned tube of the heat exchanger, and the outer fins are corrugated fins. When the pressurized waste gas flows back through the outer fins, the waste gas generates eddy currents under the guidance of the corrugations of the outer fins, and the eddy currents can prevent the impurities in the waste gas from adhering to the outer fins.
[0006] Furthermore, a tapered hole with a gradually decreasing inner diameter is provided between the guiding part and the gas part, and the inclined surface of the tapered hole is aligned with the inlet edge of the combustion furnace.
[0007] Furthermore, the range of the inclined surface angle R3 is between 120° and 150°.
[0008] Furthermore, a plurality of outer fins arranged axially around the outer wall of the finned tube of the heat exchanger are arranged in an array, and there is an alternating interval between two adjacent rows of outer fins in the array.
[0009] Furthermore, the distance between two adjacent outer fins in the same row in the array is L1; the row spacing in the array is L1 / 2.
[0010] Further, a plurality of flow guiding grooves are formed in the inner wall of the flow guiding portion along its length direction, and the plurality of flow guiding grooves are arranged circumferentially along the inner wall of the flow guiding portion, and the flow guiding grooves extend to the front end position of the tapered hole.
[0011] Further, the number of the flow guiding grooves is four.
[0012] Further, a wind box is sleeved outside the flow guiding portion, and an exhaust gas collecting pipe surrounding the flow guiding portion is arranged on the outer side of the flow guiding portion in the wind box. The air inlet of the exhaust gas collecting pipe is opened facing the reflux direction of the exhaust gas, and the exhaust port of the exhaust gas collecting pipe is opened on one side of the wind box.
[0013] Further, the combustion air duct is arranged on the other side of the wind box.
[0014] Compared with the prior art, the advantages of the present utility model are as follows:
[0015] 1. In the present utility model, by setting the inner pipe diameter of the gas combustion portion to be smaller than the inner pipe diameter of the flow guiding portion, the air pressure after the combustion air is introduced into the gas combustion portion is increased, thereby increasing the air pressure of the exhaust gas discharged from the combustion furnace. And by defining the outer fins as a corrugated structure, when the pressurized exhaust gas with sufficient pressure flows back through the outer fins, the exhaust gas generates a vortex under the guidance of the corrugations of the outer fins, and the vortex can prevent impurities in the exhaust gas from adhering to the outer fins.
[0016] 2. In the present utility model, by providing a tapered hole with a gradually decreasing inner pipe diameter between the flow guiding portion and the gas combustion portion, and the inclined surface of the tapered hole is aligned with the edge of the inlet of the combustion furnace, the combustion air can be further smoothly compressed.
[0017] 3. In the present utility model, a plurality of flow guiding grooves are formed in the inner wall of the flow guiding portion along its length direction for guiding the combustion air to flow towards the combustion furnace.
[0018] 4. In the present utility model, a plurality of outer fins form an array, and the plurality of outer fins in adjacent rows are alternately spaced, so that the exhaust gas can be shunted during the process of passing through the array, achieving the purpose of uniform distribution, and avoiding the deposition and blockage of impurities caused by the concentration of the exhaust gas in one place. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 is a structural diagram of the present utility model;
[0020] Figure 2 is a structural diagram inside the heat exchanger finned tube;
[0021] Figure 3 is a structural diagram of the outer fin array;
[0022] Reference numerals:
[0023] 1. Heat exchanger finned tube; 11. Air box; 2. Flow guiding part; 3. Gas part; 4. Combustion furnace; 5. Outer fin; 6. Tapered hole; 7. Flow guiding groove; 9. Combustion-supporting air duct; 10. Exhaust gas collecting pipe. Detailed implementation mode
[0024] The technical solutions of the utility model will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of them.
[0025] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the utility model without creative efforts shall fall within the scope of protection of the utility model.
[0026] In the description of the utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to has a specific orientation, is constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0027] In the description of the utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the utility model can be understood according to specific situations. Embodiment
[0028] As Figure 1 shown, a heat exchanger finned tube structure of a burner for a heat treatment furnace includes a flow guiding part and a gas part that are connected and communicated. A combustion-supporting air duct is connected to the flow guiding part, and a combustion furnace is installed in the gas part. The inner diameter of the tube of the gas part is smaller than that of the flow guiding part, so that the air pressure is increased after the combustion-supporting air is introduced into the gas part, thereby increasing the exhaust gas pressure discharged from the combustion furnace.
[0029] As Figure 2 shown, a tapered hole with a gradually decreasing tube inner diameter is provided between the flow guiding part and the gas part, and the inclined surface of the tapered hole is aligned with the inlet edge of the combustion furnace. The range of the inclined surface angle R3 is between 120° and 150°.
[0030] A plurality of external fins arranged circumferentially are provided on the outer wall of the tube of the heat exchanger finned tube. The external fins are arranged along the axial direction of the heat exchanger finned tube. The external fins are corrugated fins. When the pressurized exhaust gas flows back through the external fins, the exhaust gas generates eddy currents under the guidance of the corrugations of the external fins, and the eddy currents can prevent impurities in the exhaust gas from adhering to the external fins.
[0031] As Figure 1 shown, a wind box is sleeved outside the guiding part. An exhaust gas collecting pipe arranged around the guiding part is provided on the outer side of the guiding part in the wind box. The air inlet of the exhaust gas collecting pipe is opened facing the flowing-back direction of the exhaust gas. The exhaust port of the exhaust gas collecting pipe is opened on one side of the wind box, and the combustion-supporting air pipe is provided on the other side of the wind box.
[0032] As Figure 3 shown, a plurality of external fins arranged axially on the outer wall of the heat exchanger finned tube are arranged in an array, and adjacent external fins in two rows in the array are alternately spaced. The distance between two adjacent external fins in the same row in the array is L1; the row spacing in the array is L1 / 2. Embodiment
[0033] As Figure 1 shown, a heat exchanger finned tube structure of a burner for a heat treatment furnace includes a guiding part and a gas part that are connected and communicate with each other. A combustion-supporting air pipe is connected to the guiding part. A combustion furnace is installed in the gas part. The inner diameter of the tube of the gas part is smaller than the inner diameter of the tube of the guiding part, so that the air pressure is increased after the combustion-supporting air is introduced into the gas part, thereby increasing the air pressure of the exhaust gas discharged from the combustion furnace; a plurality of guiding grooves arranged along the length direction are opened in the inner wall of the guiding part. The plurality of guiding grooves are arranged circumferentially on the inner wall of the guiding part. The guiding grooves extend to the front end position of the tapered hole. The number of the guiding grooves is four.
[0034] As Figure 2 shown, a tapered hole with a gradually decreasing inner diameter of the tube is provided between the guiding part and the gas part. The inclined surface of the tapered hole is aligned with the edge of the inlet of the combustion furnace. The range of the inclined surface angle R3 is between 120° and 150°.
[0035] A plurality of external fins arranged circumferentially are provided on the outer wall of the tube of the heat exchanger finned tube. The external fins are arranged along the axial direction of the heat exchanger finned tube. The external fins are corrugated fins. When the pressurized exhaust gas flows back through the external fins, the exhaust gas generates eddy currents under the guidance of the corrugations of the external fins, and the eddy currents can prevent impurities in the exhaust gas from adhering to the external fins.
[0036] As Figure 3 shown, a plurality of external fins arranged axially on the outer wall of the heat exchanger finned tube are arranged in an array, and adjacent external fins in two rows in the array are alternately spaced. The distance between two adjacent external fins in the same row in the array is L1; the row spacing in the array is L1 / 2.
[0037] The combustion-supporting air enters the inside of the finned tube of the heat exchanger, passes through the diversion groove and the tapered hole and then enters the combustion chamber. In this way, the entering combustion-supporting air is more concentrated and has a greater pressure. The flame after combustion is sprayed into the radiation tube at a farther distance, and the backflow pressure of the exhaust gas after combustion is greater.
[0038] When the exhaust gas flows back, it passes through the outer fin array. The outer fins are designed in a corrugated structure. When the exhaust gas flows back, it can rotate and flow. The temperature of the metal heat exchanger is more uniform, the surface is not easily cracked, and the probability of the waste generated by the gas combustion blocking the channels in the outer fin array is reduced.
[0039] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. The heat exchanger finned tube structure of a heat treatment furnace burner, comprising a communicating diversion part and a gas part, a combustion air duct is connected to the diversion part, and a combustion furnace is installed in the gas part, characterized in that, The inner pipe diameter of the gas part is smaller than that of the diversion part, which increases the air pressure after the combustion-supporting air is introduced into the gas part, thereby increasing the air pressure of the exhaust gas discharged from the combustion furnace; A plurality of outer fins arranged circumferentially around the outer pipe wall of the heat exchanger finned tube are provided. The outer fins are arranged along the axial direction of the heat exchanger finned tube, and the outer fins are corrugated fins. When the pressurized exhaust gas flows back through the outer fins, the exhaust gas generates eddy currents under the guidance of the corrugations of the outer fins, and the eddy currents can prevent impurities in the exhaust gas from adhering to the outer fins.
2. The heat exchanger finned tube structure of the heat treatment furnace burner according to claim 1, characterized in that, A tapered hole with a gradually decreasing inner pipe diameter is provided between the diversion part and the gas part, and the inclined surface of the tapered hole is aligned with the inlet edge of the combustion furnace.
3. The heat exchanger finned tube structure of the heat treatment furnace burner according to claim 2, characterized in that, The range of the inclined surface angle R3 is between 120° and 150°.
4. The heat exchanger finned tube structure of the heat treatment furnace burner according to claim 1, characterized in that, A plurality of outer fins arranged axially around the outer pipe wall of the heat exchanger finned tube are arranged in an array, and there are alternating intervals between two adjacent rows of outer fins in the array.
5. The heat exchanger finned tube structure of the heat treatment furnace burner according to claim 4, characterized in that, The distance between two adjacent outer fins in the same row in the array is L1; the row spacing in the array is L1 / 2.
6. The heat exchanger finned tube structure of the heat treatment furnace burner according to claim 1, characterized in that, A plurality of diversion grooves arranged along the length direction are provided in the inner wall of the diversion part, and the plurality of diversion grooves are arranged circumferentially along the inner wall of the diversion part, and the diversion grooves extend to the front end position of the tapered hole.
7. The heat exchanger finned tube structure of the heat treatment furnace burner according to claim 6, characterized in that, The number of the diversion grooves is four.
8. The heat exchanger finned tube structure of the heat treatment furnace burner according to claim 1, characterized in that, A wind box is sleeved outside the diversion part. An exhaust gas collecting pipe arranged around the diversion part is provided on the outside of the diversion part in the wind box. The air inlet of the exhaust gas collecting pipe is opened facing the flow-back direction of the exhaust gas, and the exhaust port of the exhaust gas collecting pipe is opened on one side of the wind box.
9. The heat exchanger finned tube structure of the heat treatment furnace burner according to claim 8, characterized in that, The combustion-supporting air pipe is provided on the other side of the wind box.