Layered and segmented flow guide device for high-temperature flue gas in flue of heating furnace

Abstract

The utility model relates to the technical field of heating furnaces, and provides a heating furnace flue high-temperature flue gas layered and segmented flow guide device which comprises a main flue, the main flue is connected with two smoke exhaust pipes of a heating furnace, two flow guide walls are oppositely arranged in the main flue, and the flow guide walls are arranged at the gas outlet ends of the smoke exhaust pipes. The flow guide wall is additionally arranged in the main flue, the flow guide wall conducts flow division and direction division on flue gas entering the main flue, the flue gas can evenly wash all heat exchanger tube bundles, and therefore the efficiency of a heat exchanger and the temperature of combustion-supporting air are improved, and the service life of the heat exchanger is prolonged.

Description

Technical Field

[0001] This application relates to the field of heating furnace technology, and more specifically, to a stratified and segmented flow guiding device for high-temperature flue gas in a heating furnace flue. Background Technology

[0002] Heating furnaces are crucial equipment for heating materials and equipment in industry, widely used in metallurgy and chemical industries. They are also major energy-consuming devices, accounting for more than 50% of the total energy consumption of a process. Therefore, the energy efficiency and effectiveness of heating furnaces directly affect the cost and profitability of the entire production line. Improving the utilization efficiency of waste heat from the flue gas of heating furnaces is an important measure to improve the efficiency of heating furnaces. The utilization of waste heat from flue gas generally involves installing air heat exchangers and gas heat exchangers (both tubular heat exchangers) inside the main flue. The flue gas scours the air heat exchangers and gas heat exchangers to preheat the air and gas (air first).

[0003] like Figure 1 As shown, for a large heating furnace 1, due to the large flue gas flow rate, two exhaust pipes 3 are usually installed for double-sided exhaust. The flue gas inside the heating furnace 1 is discharged through the exhaust pipes 3 and then flows into the main flue duct 1. Considering the arrangement of heat exchangers with sufficient area (air heat exchanger 7 and gas heat exchanger 8), the design width of the main flue duct 1 is generally more than 10m. Due to the large design width of the main flue duct 1, after the flue gas inside the two exhaust pipes 3 flows into the main flue duct 1 at a certain angle (about 45°), the flue gas velocity perpendicular to the main flue duct 1 decreases rapidly, causing most of the flue gas to not reach the central area of ​​the main flue duct 1, but instead... The erosion of the heat exchanger's two ends along the inner wall of the main flue causes excessively high temperatures at both ends and insufficient heat exchange in the middle, resulting in low preheated air temperature and low overall efficiency of the heat exchanger. Furthermore, under the long-term effect of flue gas flow deviation, the two ends of the heat exchanger suffer burn-out damage, shortening its service life. Therefore, by adding a segmented flow guiding device inside the main flue, the flue gas flow field and temperature field inside the main flue are made more uniform, and the heat transfer of each section of the heat exchanger is balanced. This is of great practical significance for improving the efficiency of the heat exchanger, the temperature of the combustion air, and extending the service life of the heat exchanger. To this end, a layered and segmented flow guiding device for high-temperature flue gas in the heating furnace flue is proposed. Utility Model Content

[0004] The purpose of this application is to provide a stratified and segmented flow guiding device for high-temperature flue gas in a heating furnace flue, which diverts and directs the flue gas so that it can evenly flush all heat exchanger tube bundles, thereby improving heat exchanger efficiency and combustion air temperature, and extending the service life of the heat exchangers.

[0005] This application provides a stratified and segmented flow guiding device for high-temperature flue gas in a heating furnace flue, adopting the following technical solution:

[0006] A stratified and segmented flow guiding device for high-temperature flue gas in a heating furnace includes a main flue, which connects to two exhaust pipes of the heating furnace. Two guide walls are arranged opposite each other inside the main flue, and the guide walls are located at the gas outlet end of the exhaust pipes.

[0007] Preferably, the guide wall includes an arc-shaped segment and a straight segment, the arc-shaped segment being located between the straight segment and the exhaust pipe, and the straight segment being arranged along the axial direction of the main flue.

[0008] Preferably, the upper end of the guide wall is connected to the inner top of the main flue.

[0009] Preferably, the guide wall is a masonry structure that is wider at the top and narrower at the bottom.

[0010] Preferably, the cross-sectional area of ​​the guide wall near the exhaust pipe is smaller than the cross-sectional area of ​​the guide wall away from the exhaust pipe.

[0011] Preferably, the cross-sectional area of ​​the guide wall near the end of the exhaust pipe accounts for 2%-3% of the outlet area of ​​the exhaust pipe.

[0012] Preferably, the guide wall is provided with a wear-resistant layer.

[0013] Preferably, the wear-resistant layer is composed of several wear-resistant ceramic blocks.

[0014] Compared with the prior art, the beneficial effects of this application are as follows:

[0015] This application adds a guide wall inside the main flue to divert and direct the flue gas entering the main flue, so that the flue gas can evenly flush all the heat exchanger tube bundles, thereby improving the heat exchanger efficiency and combustion air temperature, and extending the service life of the heat exchanger. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a top view of a heating furnace flue in the prior art;

[0018] Figure 2 This is a top view of the present invention.

[0019] The reference numerals in the attached figures are as follows:

[0020] 1. Main flue; 2. Heating furnace; 3. Exhaust pipe; 4. Guide wall; 5. Arc section; 6. Straight section; 7. Air heat exchanger; 8. Gas heat exchanger; 9. Chimney; 10. Baffle. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not 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 on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "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 application based on the specific circumstances.

[0027] Example

[0028] like Figure 1 and Figure 2 As shown in the embodiment of this application, the high-temperature flue gas stratification and segmentation guiding device for heating furnace flue includes a main flue 1, which is connected to two exhaust pipes 3 of the heating furnace 2. Two guide walls 4 are arranged opposite each other inside the main flue 1, and the guide walls 4 are located at the gas outlet end of the exhaust pipes 3.

[0029] During use, the flue gas inside the heating furnace 2 is discharged through the exhaust pipe 3 and then flows into the interior of the main flue 1. The guide wall 4 diverts and directs the flue gas entering the main flue 1, so that the flue gas can evenly flush all the heat exchanger tube bundles, thereby improving the heat exchanger efficiency and combustion air temperature, and extending the service life of the heat exchanger.

[0030] In this embodiment, the guide wall 4 includes an arc-shaped section 5 and a straight section 6. The arc-shaped section 5 is located between the straight section 6 and the exhaust pipe 3. The straight section 6 is arranged along the axial direction of the main flue 1. The arc-shaped section 5 can reduce the airflow resistance of the flue gas.

[0031] In this embodiment, the upper end of the guide wall 4 is connected to the inner top of the main flue 1. The guide wall 4 supports the main flue 1 while effectively dividing the airflow.

[0032] In this embodiment, considering the density difference of high-temperature flue gas, the guide wall 4 is a masonry structure that is wider at the top and narrower at the bottom. The guide wall 4 has a smooth and gradual transition from top to bottom. The design of the above structure can make the lower flow area larger than the upper flow area, so that the flue gas is more evenly distributed in the vertical direction.

[0033] In this embodiment, in order to ensure smooth airflow, the cross-sectional area of ​​the guide wall 4 near the exhaust pipe 3 is smaller than the cross-sectional area of ​​the guide wall 4 away from the exhaust pipe 3.

[0034] In this embodiment, the cross-sectional area of ​​the guide wall 4 near the end of the exhaust pipe 3 accounts for 2%-3% of the outlet area of ​​the exhaust pipe 3.

[0035] In this embodiment, a wear-resistant layer is provided on the guide wall 4. The wear-resistant layer is made up of several wear-resistant ceramic blocks. The placement of the wear-resistant ceramic blocks gives the guide wall 4 sufficient rigidity and heat resistance, which can meet the exhaust requirements of the heating furnace 2 under different operating conditions.

[0036] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A stratified and segmented flow guiding device for high-temperature flue gas in a heating furnace flue, characterized in that: It includes a main flue, which connects two exhaust pipes of the heating furnace. The main flue has two guide walls arranged opposite each other inside, which are located at the gas outlet end of the exhaust pipe.

2. The high-temperature flue gas stratification and segmentation guiding device for a heating furnace flue according to claim 1, characterized in that: The guide wall includes an arc-shaped section and a straight section. The arc-shaped section is located between the straight section and the exhaust pipe, and the straight section is arranged along the axial direction of the main flue.

3. The high-temperature flue gas stratification and segmentation guiding device for a heating furnace flue according to claim 2, characterized in that: The upper end of the guide wall is connected to the inner top of the main flue.

4. The high-temperature flue gas stratification and segmentation guiding device for a heating furnace flue according to claim 3, characterized in that: The guide wall is a masonry structure that is wider at the top and narrower at the bottom.

5. The high-temperature flue gas stratification and segmentation guiding device for a heating furnace flue according to claim 4, characterized in that: The cross-sectional area of ​​the guide wall near the exhaust pipe is smaller than the cross-sectional area of ​​the guide wall away from the exhaust pipe.

6. A stratified and segmented flow guiding device for high-temperature flue gas in a heating furnace according to any one of claims 1-5, characterized in that: The cross-sectional area of ​​the guide wall near the end of the exhaust pipe accounts for 2%-3% of the outlet area of ​​the exhaust pipe.

7. The high-temperature flue gas stratification and segmentation guiding device for a heating furnace flue according to claim 6, characterized in that: The flow guide wall is provided with a wear-resistant layer.

8. The high-temperature flue gas stratification and segmentation guiding device for a heating furnace flue according to claim 7, characterized in that: The wear-resistant layer is composed of several wear-resistant ceramic blocks.

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