A natural cooling fan

Abstract

The utility model provides a natural cold -blast device relates to refrigeration equipment technical field, this natural cold -blast device includes: air inlet chamber for receiving high temperature flue gas, inlet cooling pipe group has a plurality of side -by -side arrangement's inlet cooling pipe, its top end is connected with air inlet chamber, air inlet hopper is connected in the bottom of inlet cooling pipe, main cooling pipe group has a plurality of side -by -side arrangement's main cooling pipe, one end is connected with air inlet hopper, and main cooling pipe is bent and forms the passageway for air natural convection in main cooling pipe group, and the highest point of main cooling pipe is higher than air inlet chamber, air outlet hopper is same with the height of air inlet hopper, and the other end of main cooling pipe is connected with air outlet hopper, outlet cooling pipe group has a plurality of side -by -side arrangement's outlet cooling pipe, and its bottom is connected with air outlet hopper, air outlet chamber is connected at the top of outlet cooling pipe, and air outlet chamber is used for leading out low temperature flue gas. This natural cold -blast device can effectively enhance the cooling effect to high temperature flue gas.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment technology, and in particular to a natural air cooler. Background Technology

[0002] In the metallurgical industry, high-temperature dust-laden flue gas must be cooled before entering dust removal facilities due to limitations in equipment materials and structure. There are various methods for cooling the high-temperature flue gas. For downstream dust collectors such as baghouse filters, indirect cooling is the preferred method because the filter bags are highly sensitive to the moisture content of the flue gas. Among indirect cooling methods, natural air coolers are widely used due to their simple structure and low energy consumption, but they also have drawbacks such as large footprint and low heat exchange efficiency.

[0003] Traditional natural air coolers achieve natural convection heat exchange between flue gas and air by setting up appropriate cooling pipes. Patent application CN208026089U proposes a multi-pipe natural air cooler, which includes straight cooling pipes, U-shaped cooling pipes, an air inlet chamber, a return air chamber, and a supporting device. The implementation process of this multi-pipe natural air cooler is as follows: dust-laden flue gas enters through the air inlet chamber, and after being cooled by the straight cooling pipes, U-shaped cooling pipes, and vertical cooling pipes, the flue gas temperature reaches the required level and is discharged from the return air chamber. However, because the airflow cross-section between the first and second vertical cooling pipes is very small, it is not conducive to the diffusion of heated air, thus affecting the heat exchange efficiency of the heat exchange pipes. After being cooled by the cooling pipes at the front end of the cooler, the flue gas temperature in the later section has already decreased, the temperature difference with the air has decreased, and the heat exchange efficiency is lower than that in the earlier section, resulting in poor heat exchange effect.

[0004] In view of this, based on years of experience in production and design in this and related fields, the inventor has designed a natural air cooler through repeated experiments in order to solve the problems existing in the prior art. Utility Model Content

[0005] The purpose of this invention is to provide a natural air cooler that can effectively enhance the cooling effect on high-temperature flue gas.

[0006] To achieve the above objectives, this utility model proposes a natural air cooler, wherein the natural air cooler comprises:

[0007] The air intake chamber is used to receive high-temperature flue gas;

[0008] The inlet cooling pipe assembly has multiple inlet cooling pipes arranged side by side, the inlet cooling pipes are vertically arranged, and the top of the inlet cooling pipes are connected to the air intake chamber;

[0009] An air inlet ash hopper is connected to the bottom end of the inlet cooling pipe;

[0010] The main cooling pipe assembly has multiple main cooling pipes arranged side by side. One end of each main cooling pipe is connected to the air intake ash hopper. The main cooling pipes are bent and form a channel for natural air convection within the main cooling pipe assembly. The highest point of each main cooling pipe is higher than the air intake chamber.

[0011] An exhaust ash hopper is at the same height as the inlet ash hopper, and the other end of the main cooling pipe is connected to the exhaust ash hopper;

[0012] The outlet cooling pipe assembly has multiple outlet cooling pipes arranged side by side, the outlet cooling pipes are vertically arranged, and the bottom end of the outlet cooling pipes is connected to the outlet ash hopper.

[0013] An exhaust chamber, connected to the top of the outlet cooling pipe, is used to exhaust low-temperature flue gas.

[0014] Compared with the prior art, the present invention has the following features and advantages:

[0015] The natural air cooler proposed in this utility model has a main cooling pipe in a bent shape that forms a channel for natural air convection, so that the air outside the main cooling pipe can effectively exchange heat with the high-temperature flue gas inside the main cooling pipe, thereby enhancing the cooling effect of the natural air cooler on the high-temperature flue gas.

[0016] The natural air cooler proposed in this invention achieves efficient cooling of high-temperature flue gas through natural convection of air and flue gas, creating favorable conditions for subsequent bag filter dust removal.

[0017] The natural air cooler proposed in this utility model has a simple structure, high reliability, zero energy consumption, and long service life. Attached Figure Description

[0018] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0019] Figure 1 This utility model proposes a natural air cooler;

[0020] Figure 2 for Figure 1 A-direction view;

[0021] Figure 3 for Figure 1 View from direction B;

[0022] Figure 4 for Figure 1 C-axis sectional view;

[0023] Figure 5 for Figure 1 Sectional view along the DD direction.

[0024] Explanation of reference numerals in the attached figures

[0025] 100. Natural air cooler; 10. Air inlet chamber; 20. Inlet cooling pipe assembly; 21. Inlet cooling pipe; 30. Air inlet hopper; 40. Main cooling pipe assembly; 41. Main cooling pipe; 411. Upward section; 412. Downward section; 413. First inclined pipe section; 414. First straight pipe section; 415. Elbow section; 416. Second straight pipe section; 417. Second inclined pipe section; 50. Air outlet hopper; 60. Outlet cooling pipe assembly; 61. Outlet cooling pipe; 70. Air outlet chamber. Detailed Implementation

[0026] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.

[0027] like Figure 1 As shown, this utility model proposes a natural air cooler 100, comprising:

[0028] Inlet chamber 10 is used to receive high-temperature flue gas;

[0029] The inlet cooling pipe assembly 20 has multiple inlet cooling pipes 21 arranged side by side. The inlet cooling pipes 21 are arranged vertically, and the top of the inlet cooling pipes 21 are connected to the air intake chamber 10.

[0030] An air inlet ash hopper 30 is connected to the bottom end of the inlet cooling pipe 21;

[0031] The main cooling pipe assembly 40 has multiple main cooling pipes 41 arranged in parallel. One end of the main cooling pipe 41 is connected to the air intake ash hopper 30. The main cooling pipe 41 is bent and forms a channel for natural air convection in the main cooling pipe assembly 40. The highest point of the main cooling pipe 41 is higher than the air intake chamber 10.

[0032] The exhaust ash hopper 50 is at the same height as the inlet ash hopper 30, and the other end of the main cooling pipe 41 is connected to the exhaust ash hopper 50.

[0033] The outlet cooling pipe assembly 60 has multiple outlet cooling pipes 61 arranged side by side. The outlet cooling pipes 61 are arranged vertically, and the bottom end of the outlet cooling pipes 61 is connected to the outlet ash hopper 50.

[0034] The exhaust chamber 70 is connected to the top of the outlet cooling pipe 61 and is used to exhaust low-temperature flue gas.

[0035] The natural air cooler 100 proposed in this utility model allows high-temperature flue gas to enter the inlet cooling pipe assembly 20 through the inlet chamber 10. The high-temperature flue gas undergoes initial cooling within the inlet cooling pipe assembly 20. After this initial cooling, the flue gas enters the inlet ash hopper 30 through the inlet cooling pipe assembly 20. In the inlet ash hopper 30, the flue gas is turned 180 degrees and enters the main cooling pipe assembly 40. Some dust in the flue gas settles to the bottom of the inlet ash hopper 30 due to inertia. The flue gas entering the main cooling pipe assembly 40 then undergoes convection with the air outside the main cooling pipe assembly 40. The heat is more pronounced because the main cooling pipe assembly 40 forms a channel for natural air convection, which makes the second cooling effect on the flue gas more significant. After the second cooling, the flue gas enters the outlet ash hopper 50, turns 180 degrees in the outlet ash hopper 50 and enters the outlet cooling pipe assembly 60. Large dust particles in the flue gas settle to the bottom of the outlet ash hopper 50. The flue gas is reduced to the qualified temperature in the outlet cooling pipe assembly 60. After the qualified cooling, the flue gas rises into the outlet chamber 70, collects, and is discharged to the subsequent device connected to the natural air cooler 100.

[0036] The natural air cooler 100 proposed in this utility model has a main cooling pipe 41 of the main cooling pipe assembly 40 that is bent and forms a channel for natural air convection, so that the air outside the main cooling pipe 41 can effectively exchange heat with the high-temperature flue gas inside the main cooling pipe 41, thereby enhancing the cooling effect of the natural air cooler 100 on the high-temperature flue gas.

[0037] The natural air cooler 100 proposed in this utility model achieves efficient cooling of high-temperature flue gas through natural convection of air and flue gas, creating favorable conditions for subsequent bag filter dust removal.

[0038] The natural air cooler 100 proposed in this utility model has a simple structure, high reliability, zero energy consumption, and long service life.

[0039] In one optional embodiment of this utility model, the inlet ash hopper 30 and the outlet ash hopper 50 are arranged side by side in the horizontal direction.

[0040] In an optional embodiment, the bottom of the inlet ash hopper 30 and the bottom of the outlet ash hopper 50 are respectively provided with ash outlets to facilitate the collection and discharge of dust settled in the flue gas.

[0041] In one optional embodiment of this utility model, the air inlet chamber 10 is set higher than the air outlet chamber 70, or the air inlet chamber 10 and the air outlet chamber 70 are at the same height.

[0042] In an optional embodiment of this invention, the main cooling pipe 41 includes an upward section 411, a bent section, and a downward section 412 arranged sequentially. The upward section 411 is arranged parallel to the inlet cooling pipe 21, the downward section 412 is arranged parallel to the outlet cooling pipe 61, and the bent section is higher than the air inlet chamber 10. This bent section creates a wide channel for natural air convection in the space outside the main cooling pipe 41, enhancing the heat exchange efficiency on the air side.

[0043] In an optional embodiment, the bending section includes a first inclined pipe section 413, a first straight pipe section 414, an elbow section 415, a second straight pipe section 416, and a second inclined pipe section 417 arranged sequentially. The first inclined pipe section 413 is connected to the upward section 411, and the second inclined pipe section 417 is connected to the downward section 412. The first inclined pipe section 413 and the second inclined pipe section 417 are respectively inclined upwards in opposite directions. The first straight pipe section 414 and the second straight pipe section 416 are vertically arranged and spaced apart. Because the distance between the first straight pipe section 414 and the second straight pipe section 416 is relatively large, a wide channel for air circulation is formed. More flowing air makes it easier for heat to be carried away, thereby improving the heat exchange efficiency of the cooler.

[0044] In an optional embodiment of this implementation, the distance between the first straight pipe section 414 and the second straight pipe section 416 is greater than the distance between the upward section 411 and the downward section 412. With the above structure, the interval between the first straight pipe section 414 and the second straight pipe section 416 is the widest point of the natural air convection channel, where the air heat exchange efficiency is the highest and the cooling effect on the flue gas in the main cooling pipe 41 is the best.

[0045] In one optional example of this implementation, the angle between the first inclined tube segment 413 and the vertical direction ranges from 20° to 30°.

[0046] Preferably, the angle between the first inclined tube section 413 and the vertical direction is 30°.

[0047] In one optional example, the inner diameter of the outlet cooling pipe 61 is larger than the inner diameter of the inlet cooling pipe 21. After the first two cooling cycles, the flue gas temperature drops from high to medium temperature, and the temperature difference with the air also decreases. Since the smaller the temperature difference, the lower the heat transfer efficiency, increasing the inner diameter of the outlet cooling pipe 61 reduces the flow velocity of the flue gas within it, thereby increasing the residence time of the flue gas within the cooling pipe assembly. This allows for the removal of more heat from the flue gas, achieving more efficient heat exchange.

[0048] Preferably, the inner diameter of the inlet cooling pipe 21 is 800 mm, and the flue gas velocity in the inlet cooling pipe 21 is controlled at 15-20 m / s; the inner diameter of the outlet cooling pipe 61 is 1200 mm, and the flue gas velocity in the outlet cooling pipe 61 is controlled at 8-10 m / s.

[0049] In one optional embodiment of the present invention, the inlet cooling pipe assembly 20 includes multiple inlet cooling pipes 21 arranged side by side, and the cross-sectional area of ​​the inlet chamber 10 gradually decreases along the flue gas flow direction.

[0050] In an optional example of this implementation, the inlet cooling pipe assembly 20 includes a plurality of inlet cooling pipes 21.

[0051] Preferably, the inlet cooling pipe group 20 includes 12 inlet cooling pipes 21, with 6 inlet cooling pipes 21 forming a group.

[0052] In one optional embodiment of the present invention, the outlet cooling pipe assembly 60 includes multiple outlet cooling pipes 61 arranged side by side, and the cross-sectional area of ​​the outlet chamber 70 increases gradually along the flue gas flow direction.

[0053] In an optional example of this implementation, the outlet cooling pipe assembly 60 includes a plurality of outlet cooling pipes 61.

[0054] Preferably, the outlet cooling pipe group 60 includes 8 outlet cooling pipes 61, with 4 inlet cooling pipes 21 forming a group.

[0055] In one optional embodiment of this utility model, the inner diameter of the main cooling pipe 41 is 800 mm.

[0056] In one optional embodiment of the present invention, the main cooling pipe group 40 includes 12 main cooling pipes 41, with 6 main cooling pipes 41 forming a group.

[0057] Please refer to Figures 1 to 5 As shown, the specific implementation of the natural air cooler 100 proposed in this utility model will now be described in detail with reference to an embodiment.

[0058] Dust-laden high-temperature flue gas enters the natural air cooler 100 from the inlet chamber 10. The bottom of the inlet chamber 10 has an opening that connects to the inlet cooling pipe assembly 20. The inlet chamber 10 adopts a variable cross-section design to ensure that the amount of flue gas distributed to each inlet cooling pipe 21 is the same.

[0059] High-temperature flue gas enters the inlet cooling pipe group 20 downwards. In the inlet cooling pipe 21, the flue gas undergoes indirect convective heat exchange with the outside air, thereby reducing the flue gas temperature. Taking into account factors such as floor space, heat exchange effect, and inertial dust removal effect, the flue gas velocity in the inlet cooling pipe group 20 is controlled at 15-20 m / s. The diameter of the inlet cooling pipe 21 is 800 mm, with 6 pipes forming a group, and a total of 2 groups are installed.

[0060] The high-temperature flue gas undergoes a 180° turn in the inlet ash hopper 30, changing from downward to upward motion. Due to inertial effects, some of the particles it contains have different trajectories from the airflow, resulting in gas-solid separation. Some of the dust is captured and collected by the inlet ash hopper 30 and discharged periodically.

[0061] The upward-moving flue gas enters the main cooling pipe assembly 40. The bending section of the main cooling pipe 41 includes a first inclined pipe section 413, a first straight pipe section 414, an elbow section 415, a second straight pipe section 416, and a second inclined pipe section 417 arranged sequentially. The angle between the first inclined pipe section 413 and the second inclined pipe section 417 and the vertical direction is generally controlled between 20° and 30° to prevent dust accumulation. Figure 1 The angle shown is 30°. In the main cooling tube group 40, the flue gas and air continue to exchange heat through convection, and the temperature is further reduced. At the same time, the direction of movement changes by 180° again. Due to the greater distance between the center of the pipes in the upward and downward sections, a significantly wider airflow channel is formed than in other cooling tube groups. This makes it easier for the heated air to carry away the heat, thereby improving the heat exchange efficiency of the main cooling tube group 40. The diameter of the main cooling tubes 41 is 800 mm, and there are 2 groups of 6 tubes each.

[0062] The flue gas coming out of the main cooling pipe group 40 continues to move downward and enters the exhaust ash hopper 50. The direction of the flue gas movement in the exhaust ash hopper 50 changes by 180° again. Some of the dust is captured and collected by the exhaust ash hopper 50 due to inertia and discharged periodically.

[0063] The flue gas exiting the exhaust ash hopper 50 enters the outlet cooling pipe assembly 60 upwards, where it undergoes final convective heat exchange with the air, reducing its temperature to the required level. Compared to other cooling pipe assemblies, the outlet cooling pipe 61 in the outlet cooling pipe assembly 60 has a larger diameter and a lower flue gas velocity, typically controlled at 8-10 m / s. This is because after being cooled by the previous three cooling pipe assemblies, the flue gas temperature drops from high to medium temperature, and the temperature difference with the air also decreases. Since the smaller the temperature difference, the lower the heat transfer efficiency, reducing the flue gas velocity increases the residence time of the flue gas within this cooling pipe assembly, allowing more heat to be carried away and achieving more efficient heat exchange.

[0064] After the flue gas has been cooled to the required level, it enters the exhaust chamber 70 and is discharged outside the natural air cooler 100 and enters the subsequent equipment. The exhaust chamber 70 adopts a variable diameter structure to ensure that the flue gas flow rate is consistent in all places, which is conducive to the uniform distribution of flue gas in the outlet cooling pipe group 60.

[0065] The natural air cooler 100 proposed in this utility model has a main cooling tube assembly 40 with a channel for natural air convection, which greatly increases the cross-sectional area of ​​air flow and thus improves the heat exchange effect of the cooling tube assembly.

[0066] The natural air cooler 100 proposed in this utility model has an outlet cooling pipe group 60 composed of a large-diameter outlet cooling pipe 61. By reducing the flue gas flow rate, the residence time of the flue gas in the pipe is increased, thereby improving the heat exchange effect of the natural air cooler 100.

[0067] The detailed explanations of the above embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions should not be construed as limiting the present invention for any reason. In particular, the various features described in different embodiments can be arbitrarily combined with each other to form other embodiments. Unless there is an explicit description to the contrary, these features should be understood to be applicable to any embodiment, and not limited to the described embodiments.

Claims

1. A natural air cooler, characterized in that, The natural air cooler includes: The air intake chamber is used to receive high-temperature flue gas; The inlet cooling pipe assembly has multiple inlet cooling pipes arranged side by side, the inlet cooling pipes are vertically arranged, and the top of the inlet cooling pipes are connected to the air intake chamber; An air inlet ash hopper is connected to the bottom end of the inlet cooling pipe; The main cooling pipe assembly has multiple main cooling pipes arranged side by side. One end of each main cooling pipe is connected to the air intake ash hopper. The main cooling pipes are bent and form a channel for natural air convection within the main cooling pipe assembly. The highest point of each main cooling pipe is higher than the air intake chamber. An exhaust ash hopper is at the same height as the inlet ash hopper, and the other end of the main cooling pipe is connected to the exhaust ash hopper; The outlet cooling pipe assembly has multiple outlet cooling pipes arranged side by side, the outlet cooling pipes are vertically arranged, and the bottom end of the outlet cooling pipes is connected to the outlet ash hopper. An exhaust chamber, connected to the top of the outlet cooling pipe, is used to exhaust low-temperature flue gas.

2. The natural air cooler as described in claim 1, characterized in that, The air inlet hopper and the air outlet hopper are arranged side by side in the horizontal direction.

3. The natural air cooler as described in claim 1, characterized in that, The air inlet chamber is positioned higher than the air outlet chamber.

4. The natural air cooler as described in claim 1, characterized in that, The main cooling pipe includes an upward section, a bent section and a downward section arranged in sequence. The upward section is arranged parallel to the inlet cooling pipe, the downward section is arranged parallel to the outlet cooling pipe, and the bent section is higher than the air intake chamber.

5. The natural air cooler as described in claim 4, characterized in that, The uplink segment and the downlink segment are arranged side by side.

6. The natural air cooler as described in claim 5, characterized in that, The bending section includes a first inclined pipe section, a first straight pipe section, an elbow section, a second straight pipe section, and a second inclined pipe section arranged in sequence. The first inclined pipe section is connected to the upward section, and the second inclined pipe section is connected to the downward section. The first inclined pipe section and the second inclined pipe section are respectively inclined upward and in opposite directions. The first straight pipe section and the second straight pipe section are vertically arranged and spaced apart.

7. The natural air cooler as described in claim 6, characterized in that, The distance between the first straight pipe segment and the second straight pipe segment is greater than the distance between the upstream segment and the downstream segment.

8. The natural air cooler as described in claim 4, characterized in that, The inner diameter of the upward segment is larger than the inner diameter of the downward segment.

9. The natural air cooler as described in claim 1, characterized in that, The inlet cooling pipe assembly includes multiple inlet cooling pipes arranged side by side, and the cross-sectional area of ​​the inlet chamber gradually decreases along the flue gas flow direction.

10. The natural air cooler as described in claim 1, characterized in that, The outlet cooling pipe assembly includes multiple outlet cooling pipes arranged side by side, and the cross-sectional area of ​​the outlet chamber increases progressively along the flue gas flow direction.

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