Stair-step ejector cooling tower

Abstract

The present invention relates to the technical field of cooling towers, in particular to a stepped ejection cooling tower, comprising an inner tube, an air duct and a plurality of ejection flow channels, wherein the ejection flow channels comprise a first-level ejection flow channel, a second-level ejection flow channel and a third-level ejection flow channel; a first-level ejection cavity is formed between the first-level ejection flow channel and the inner tube, a second-level ejection cavity is formed between the second-level ejection flow channel and the first-level ejection flow channel, and a third-level ejection cavity is formed between the third-level ejection flow channel and the second-level ejection flow channel; the output end of the third-level ejection cavity is connected to the air duct, and a first filler is arranged in the third-level ejection cavity; a second filler is arranged in the inner tube; a liquid collecting pool is arranged below the inner tube, and from the outlet of the inner tube to the outlet of the third-level ejection ring cavity, the airflow reaches the first filler after multiple mixing through the stepped ejection method, which can ensure that a radially uniform velocity distribution is formed at the inlet cross section of the first filler.

Description

Technical Field

[0001] The invention relates to the technical field of cooling towers, in particular to a stepped ejector cooling tower. Background Art

[0002] Cooling towers are used to cool circulating water in industrial and residential facilities to meet process or usage requirements. In an open cooling tower, a fan draws cool, dry air into the tower, where it undergoes phase-change convection heat transfer with the water within the heat-exchange filler-based components. Therefore, the flow pattern within the tower is a major factor influencing heat transfer efficiency and ventilation resistance.

[0003] Conventional open cooling towers are single-unit structures (even multi-row parallel cooling towers are simply stacked together). Dry, cold air enters the tower from the side and rises vertically, exchanging heat with the descending circulating water within a single packing. The main challenges are: first, because the airflow undergoes a 90-degree turn, the flow uniformity at the packing inlet cross-section is poor (relative velocity deviation is large), resulting in low heat transfer efficiency within the packing. Second, maintaining acceptable air volume requires a high power input from the fan. Relying solely on the fan as a power source makes energy conservation difficult. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in order to overcome the problem in the prior art that the flow uniformity at the filler inlet section is poor (relative velocity deviation is large) due to the air flow undergoing a 90° turn, resulting in low heat exchange efficiency in the filler, a stepped ejector cooling tower is provided.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a cascade jet cooling tower, comprising an inner tube, a wind tube and a plurality of jet flow channels, wherein the jet flow channels include a first-stage jet flow channel, a second-stage jet flow channel and a third-stage jet flow channel;

[0006] The first-stage ejection channel is arranged around the upper part of the inner tube, a first-stage ejection cavity is formed between the first-stage ejection channel and the inner tube, and the output end of the inner tube is connected to the first-stage ejection cavity;

[0007] The secondary ejection channel is arranged around the upper portion of the primary ejection channel, a secondary ejection cavity is formed between the secondary ejection channel and the primary ejection channel, and an output end of the primary ejection cavity is communicated with the secondary ejection cavity;

[0008] The tertiary ejection channel is arranged around the upper part of the secondary ejection channel, a tertiary ejection cavity is formed between the tertiary ejection channel and the secondary ejection channel, an output end of the secondary ejection cavity is connected to the tertiary ejection cavity, an output end of the tertiary ejection cavity is connected to the air duct, and a first filler is arranged in the tertiary ejection cavity;

[0009] A second filler is arranged in the inner cylinder;

[0010] A liquid collecting pool is arranged below the inner cylinder. From the outlet of the inner cylinder to the outlet of the three-stage ejector ring cavity, the airflow reaches the first filler after multiple mixing through the stepped ejection method, which can ensure the formation of radially uniform velocity distribution at the inlet cross section of the first filler, especially ensuring sufficient airflow supply near the wall, significantly improving the heat exchange efficiency in the first filler.

[0011] In order to solve the problem of how to conveniently control the air intake of the inner tube and the ejector channel, the lower side wall of the inner tube is further provided with lateral air intake louvers;

[0012] The input port of the first-stage ejector cavity is provided with a first-stage air intake louver;

[0013] The input port of the secondary ejector cavity is provided with a secondary air intake louver;

[0014] The input port of the three-stage ejector cavity is arranged with three-stage air intake louvers.

[0015] In order to solve the problem of unstable installation of the ejector channel, a plurality of axially extending first-level fixing rods are further arranged along the circumference of the input port of the first-level ejector cavity. The ends of the first-level fixing rods are respectively connected to the inner wall of the first-level ejector channel and the outer wall of the inner cylinder. The first-level fixing rods pass through the first-level air intake louvers and are hinged to the blades of the first-level air intake louvers.

[0016] The input port of the secondary ejection cavity is circumferentially provided with a plurality of axially extending secondary fixing rods, the ends of which are respectively connected to the inner wall of the secondary ejection channel and the outer wall of the primary ejection channel, and the secondary fixing rods pass through the secondary air intake louvers and are hinged to the blades of the secondary air intake louvers;

[0017] The input port of the three-stage ejection cavity is circumferentially arranged with a number of three-stage fixing rods extending axially. The ends of the three-stage fixing rods are respectively connected to the inner wall of the three-stage ejection channel and the outer wall of the two-stage ejection channel, and the three-stage fixing rods pass through the three-stage air intake louver and are hinged to the blades of the three-stage air intake louver.

[0018] The lower portion of the inner wall of the first-stage ejection channel is a first-stage plumb surface, and the upper portion of the inner wall of the first-stage ejection channel is a first-stage introduction surface that contracts inward from bottom to top;

[0019] The inner wall surface of the secondary injection channel is a secondary introduction surface that shrinks inward from bottom to top;

[0020] The upper part of the three-stage ejector channel is a three-stage plumb plane, and the lower part of the inner wall of the three-stage ejector channel is a three-stage introduction surface that contracts inward from bottom to top.

[0021] The upper part of the inner tube is a contraction section which contracts inward from bottom to top.

[0022] It further comprises that the lower edge of the second filler is higher than the input port of the first-stage ejection cavity, and the upper edge of the second filler is lower than the contraction section of the inner tube.

[0023] It further includes a water distribution pipe and a water collector arranged above the first filler.

[0024] It further includes that the diameter of the liquid collection pool is not less than the diameter of the input port of the three-stage injection channel.

[0025] The beneficial effects of the present invention are as follows: the present invention provides a cascade ejector cooling tower, from the inner tube outlet to the third-stage ejector ring cavity outlet, through the cascade ejector method, the airflow is mixed multiple times before reaching the first filler, which can ensure that the radially uniform velocity distribution is formed at the inlet cross section of the first filler, especially ensuring that sufficient airflow is supplied near the wall surface, thereby significantly improving the heat exchange efficiency in the first filler;

[0026] The cascade injection method fully exploits the self-organizing ability of the flow, which can reduce the input power of the fan while ensuring the air flow and flow uniformity, and significantly reduce the energy consumption of mechanical ventilation;

[0027] The two-stage packing can further tap the heat transfer potential in the tower. The mixing zones at each level are located between the first packing and the second packing. Phase change convection heat transfer not only occurs in the packing, but also presents a stepped heat transfer mode in the entire tower body, effectively improving the heat transfer efficiency of the entire tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below with reference to the accompanying drawings and examples.

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0030] Figure 2 It is a schematic cross-sectional view of the present invention;

[0031] Figure 3 It is a flow diagram of the present invention.

[0032] In the figure: 1. inner tube, 11. lateral air intake louver, 12. contraction section, 2. air duct, 3. primary ejector channel, 31. primary ejector cavity, 32. primary air intake louver, 33. primary fixing rod, 34. primary vertical plane, 35. primary introduction surface, 4. secondary ejector channel, 41. secondary ejector cavity, 42. secondary air intake louver, 43. secondary fixing rod, 44. secondary introduction surface, 5. tertiary ejector channel, 51. tertiary ejector cavity, 52. tertiary air intake louver, 53. tertiary fixing rod, 54. tertiary vertical plane, 55. tertiary introduction surface, 6. primary filler, 7. secondary filler, 8. liquid collecting tank, 9. water distribution pipe, 10. water collector. DETAILED DESCRIPTION

[0033] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner, and thus only show components related to the present invention.

[0034] like Figure 1 Schematic diagram of the structure of the present invention, a cascade jet cooling tower, including an inner tube 1, a wind tube 2 and a plurality of jet flow channels, the jet flow channels including a primary jet flow channel 3, a secondary jet flow channel 4 and a tertiary jet flow channel 5;

[0035] like Figure 2 As shown, the primary ejection channel 3 is arranged around the upper part of the inner tube 1, and a primary ejection cavity 31 is formed between the primary ejection channel 3 and the inner tube 1. The output end of the inner tube 1 is connected to the primary ejection cavity 31. The inlet diameter (width) of the primary ejection cavity 31 is larger than the diameter (width) of the inner tube 1. The difference between the inlet diameter and the width of the primary ejection cavity 31 is the width of the primary ejection cavity 31. The outlet diameter (width) above the primary ejection channel 3 is equal to the outlet diameter (width) of the inner tube 1.

[0036] like Figure 2 As shown, the secondary ejection channel 4 is arranged around the upper portion of the primary ejection channel 3, and a secondary ejection cavity 41 is formed between the secondary ejection channel 4 and the primary ejection channel 3. The output end of the primary ejection cavity 31 is connected to the secondary ejection cavity 41. The inlet diameter (width) of the secondary ejection cavity 41 is larger than the inlet diameter (width) of the primary ejection cavity 31, and the difference between the two is the width of the secondary ejection cavity 41.

[0037] like Figure 2 As shown, the tertiary injection channel 5 is arranged around the upper part of the secondary injection channel 4, and a tertiary injection cavity 51 is formed between the tertiary injection channel 5 and the secondary injection channel 4. The output end of the secondary injection cavity 41 is connected to the tertiary injection cavity 51, and the output end of the tertiary injection cavity 51 is connected to the air duct 2. A first filler 6 is arranged in the tertiary injection cavity 51. The inlet diameter (width) of the tertiary injection cavity 51 is larger than the inlet diameter (width) of the secondary injection cavity 41, and the difference between the two is the width of the tertiary injection cavity 51. A water distribution pipe 9 and a water collector 10 are arranged above the first filler 6. The water distribution pipe 9 sprays high-temperature water to be treated, and exchanges heat with the cold air entering from the downstream in the second filler 6. In order to avoid the phenomenon of droplet drift, a water collector 10 is provided upstream of the water distribution pipe 9 to capture droplets and reduce the amount of droplets carried by the outlet airflow.

[0038] The first-stage ejection cavity 31, the second-stage ejection cavity 41 and the third-stage ejection cavity 51 can be circular or square. When they are circular, the annular cavity size is the diameter; when they are square, the annular cavity size is the width, all of which are within the protection scope of the present invention.

[0039] A second filler 7 is arranged in the inner tube 1. The filler is a functional module for heat exchange and is made of zigzag PVC plastic. Both the first filler 6 and the second filler 7 are made of PVC. The high-temperature liquid enters the second filler and exchanges heat with the cold air again. The lower edge of the second filler 7 is higher than the input port of the first-stage ejection cavity 31, and the upper edge of the second filler 7 is lower than the contraction section 12 of the inner tube 1.

[0040] A liquid collecting pool 8 is arranged below the inner tube 1. The diameter of the liquid collecting pool 8 is not less than the diameter of the input port of the tertiary injection channel 5. The cross section of the liquid collecting pool 8 can completely cover the tertiary injection channel 5 to collect circulating water.

[0041] like Figure 2 As shown, lateral air intake louvers 11 are provided on the lower sidewalls of the inner tube 1. When fully opened, the lateral air intake louvers 11 are parallel to the horizontal direction, and when fully closed, the lateral air intake louvers 11 are perpendicular to the horizontal direction. The total height of the lateral air intake louvers 11 is not less than 60% of the height between the upper edge of the liquid collecting pool 8 and the inlet (input port) of the first-stage ejection cavity 31. When fully closed, a light-proof effect is achieved.

[0042] The input port of the first-stage ejection cavity 31 is provided with a first-stage air intake louver 32. When the first-stage air intake louver 32 is fully opened, it is perpendicular to the horizontal direction. When the first-stage air intake louver 32 is fully closed, it is parallel to the horizontal direction. In the fully closed state, a light-proof effect is achieved.

[0043] The input port of the secondary ejection cavity 41 is provided with a secondary air intake louver 42. When the secondary air intake louver 42 is fully opened, it is perpendicular to the horizontal direction. When the secondary air intake louver 42 is fully closed, it is parallel to the horizontal direction. In the fully closed state, a light-proof effect is achieved.

[0044] The input port of the three-stage ejection cavity 51 is provided with a three-stage air intake louver 52 . The three-stage air intake louver 52 is perpendicular to the horizontal direction when it is fully opened, and is parallel to the horizontal direction when it is fully closed. In the fully closed state, a light-proof effect is achieved.

[0045] The input port of the first-stage ejection cavity 31 is circumferentially arranged with a plurality of first-stage fixing rods 33 extending in the axial direction. Four to eight first-stage fixing rods 33 are equidistantly arranged circumferentially within the first-stage ejection cavity 31. The ends of the first-stage fixing rods 33 are respectively connected to the inner wall of the first-stage ejection channel 3 and the outer wall of the inner tube 1. The first-stage fixing rods 33 pass through the first-stage air intake louvers 32 and are hinged to the blades of the first-stage air intake louvers 32.

[0046] The input port of the secondary ejection cavity 41 is circumferentially arranged with a plurality of axially extending secondary fixing rods 43. Four to eight secondary fixing rods 43 are equidistantly arranged circumferentially within the secondary ejection cavity 41. The ends of the secondary fixing rods 43 are respectively connected to the inner wall of the secondary ejection channel 4 and the outer wall of the primary ejection channel 3. The secondary fixing rods 43 pass through the secondary air intake louvers 42 and are hinged to the blades of the secondary air intake louvers 42.

[0047] The input port of the tertiary ejection cavity 51 is circumferentially provided with a plurality of axially extending tertiary fixing rods 53. Four to eight tertiary fixing rods 53 are equidistantly arranged circumferentially within the tertiary ejection cavity 51. The ends of the tertiary fixing rods 53 are respectively connected to the inner wall of the tertiary ejection channel 5 and the outer wall of the secondary ejection channel 4. The tertiary fixing rods 53 pass through the tertiary intake louvers 52 and are hinged to the blades of the tertiary intake louvers 52.

[0048] On the one hand, the first-stage fixing rod 33, the second-stage fixing rod 43 and the third-stage fixing rod 53 support and axially fix the outer wall of each stage of the ejector ring cavity; on the other hand, they maintain the rigidity and circumferentially fix the air intake louvers in each stage of the ejector ring cavity.

[0049] like Figure 2 As shown, the lower portion of the inner wall of the first-stage ejection channel 3 is a first-stage vertical plane 34, which is a plane perpendicular to the ground. The upper portion of the inner wall of the first-stage ejection channel 3 is a first-stage introduction surface 35 that contracts inward from bottom to top. The first-stage introduction surface 35 is a spline surface, which makes the fluid form an accelerated decompression trend, the flow area gradually decreases, the flow velocity increases, and the flow rate is high and low pressure.

[0050] like Figure 2 As shown, the inner wall surface of the secondary ejection channel 4 is a secondary introduction surface 44 that contracts inward from bottom to top. The secondary introduction surface 44 is a spline surface, which makes the fluid form an accelerated decompression trend;

[0051] like Figure 2 As shown, the upper portion of the three-stage ejection channel 5 is a three-stage vertical surface 54, which is a surface perpendicular to the ground. The lower portion of the inner wall of the three-stage ejection channel 5 is a three-stage introduction surface 55 that contracts inward from bottom to top. The three-stage introduction surface 55 is a spline surface, which makes the fluid form an accelerated decompression trend.

[0052] The upper portion of the inner tube 1 is a contraction section 12 that contracts inward from bottom to top, so that the fluid forms an accelerated decompression trend. Example 1:

[0053] The cooling tower is a circular step ejector mechanical ventilation cooling tower, which has an inner tube 1 and a total of 3 ejector ring cavities. Figure 3 As shown, Figure 3The middle arrow indicates the flow direction of the fluid. The airflow enters the tower body through the lateral air inlet louvers 11 at the lower part of the inner tube 1, forming an ascending mainstream. The mainstream passes through the contraction section 12 at the upper part of the inner tube 1, forming an accelerated decompression trend, attracting a primary jet flow.

[0054] The primary jet flow enters the tower body through the first-stage jet cavity 31, forms a first-stage mixing with the main flow above the outlet (output port) of the inner tube 1, and then passes through the first-stage introduction surface 35 at the upper part of the first-stage jet cavity 31, forming a second acceleration and decompression trend, attracting the secondary jet flow.

[0055] The secondary jet flow enters the tower body through the secondary jet cavity 41, and forms secondary mixing with the main flow after primary mixing above the outlet of the primary jet cavity 31. Then, it passes through the secondary introduction surface 44 at the upper part of the secondary jet cavity 41, forming a third acceleration and decompression trend, attracting the tertiary jet flow.

[0056] The tertiary injection flow enters the tower body through the tertiary injection cavity 51, and forms a tertiary mixing with the mainstream after the secondary mixing above the outlet of the secondary injection cavity 41, thereby forming a radially uniform upward airflow.

[0057] The low-temperature circulating water extracted from the liquid collection pool 8 is cooled by a thermal facility, and the water temperature rises to 60 degrees Celsius-80 degrees Celsius. The high-temperature circulating water forms a sprinkler through the water distribution pipe 9, and undergoes phase change convection heat exchange with the above-mentioned radially uniform rising airflow in the first filler 6. The liquid water escaping the first filler 6 passes through the third mixing zone, the second mixing zone, and the first mixing zone in sequence under the action of gravity. The higher turbulent kinetic energy in the mixing zone improves the heat exchange efficiency between air and water. The circulating water falls to the second filler 7, and further completes phase change convection heat transfer with the above-mentioned rising mainstream in the second filler 7. Finally, the circulating water falls to the bottom liquid collection pool 8.

[0058] A very small amount of liquid water escaping from the sides of the mixing zones at each level passes through the ejector ring cavities and air inlet louvers at each level and falls into the liquid collecting pool 8 below. After the rising drops through the water distribution pipe 9 are intercepted and collected by the water collector 10 above, they fall back into the tower and continue to participate in heat exchange and recycling.

[0059] The stepped injection can form a gradually enhanced airflow suction in each mixing zone. At the same time, the multi-stage mixing can also gradually improve the radial uniformity of the airflow cross section. Under the same action, an efficient and stable countercurrent phase change convection heat exchange system can be formed while greatly saving input energy consumption. Example 2:

[0060] The primary fixing rod 33 , the secondary fixing rod 43 and the tertiary fixing rod 53 on the same axial direction are a whole, which sequentially connect the inner tube 1 , the primary jet introduction channel 3 , the secondary jet introduction channel 4 and the tertiary jet introduction channel 5 .

[0061] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A cascade ejector cooling tower, characterized in that: It comprises an inner tube (1), an air tube (2) and a plurality of jet flow channels, wherein the jet flow channels comprise a first-stage jet flow channel (3), a second-stage jet flow channel (4) and a third-stage jet flow channel (5); The first-stage ejection channel (3) is arranged around the upper part of the inner tube (1), a first-stage ejection cavity (31) is formed between the first-stage ejection channel (3) and the inner tube (1), and the output end of the inner tube (1) is connected to the first-stage ejection cavity (31); The secondary ejection channel (4) is arranged around the upper portion of the primary ejection channel (3), a secondary ejection cavity (41) is formed between the secondary ejection channel (4) and the primary ejection channel (3), and the output end of the primary ejection cavity (31) is in communication with the secondary ejection cavity (41); The tertiary ejection channel (5) is arranged around the upper portion of the secondary ejection channel (4); a tertiary ejection cavity (51) is formed between the tertiary ejection channel (5) and the secondary ejection channel (4); the output end of the secondary ejection cavity (41) is in communication with the tertiary ejection cavity (51); the output end of the tertiary ejection cavity (51) is in communication with the air duct (2); a first filler (6) is arranged in the tertiary ejection cavity (51); a water distribution pipe (9) and a water collector (10) are arranged above the first filler (6); A second filler (7) is arranged in the inner cylinder (1); A liquid collecting tank (8) is arranged below the inner cylinder (1); A lateral air intake louver (11) is provided on the lower side wall of the inner cylinder (1); The input port of the first-stage ejection cavity (31) is provided with a first-stage air intake louver (32); The input port of the secondary ejection cavity (41) is provided with a secondary air intake louver (42); The input port of the three-stage ejector cavity (51) is provided with a three-stage air intake louver (52); A plurality of first-stage fixing rods (33) extending in the axial direction are arranged circumferentially at the input port of the first-stage ejection cavity (31), the ends of the first-stage fixing rods (33) being respectively connected to the inner wall of the first-stage ejection channel (3) and the outer wall of the inner cylinder (1), and the first-stage fixing rods (33) passing through the first-stage air intake louver (32) and being hinged to the blades of the first-stage air intake louver (32); A plurality of secondary fixing rods (43) extending in the axial direction are arranged circumferentially at the input port of the secondary ejection cavity (41), the ends of the secondary fixing rods (43) being respectively connected to the inner wall of the secondary ejection channel (4) and the outer wall of the primary ejection channel (3), and the secondary fixing rods (43) passing through the secondary air intake louver (42) and being hinged to the blades of the secondary air intake louver (42); A plurality of axially extending tertiary fixing rods (53) are arranged circumferentially at the input port of the tertiary ejection cavity (51), and the ends of the tertiary fixing rods (53) are respectively connected to the inner wall of the tertiary ejection channel (5) and the outer wall of the secondary ejection channel (4), and the tertiary fixing rods (53) pass through the tertiary air intake louvers (52) and are hinged to the blades of the tertiary air intake louvers (52).

2. The cascade ejector cooling tower according to claim 1, wherein: The lower portion of the inner wall surface of the first-stage ejection channel (3) is a first-stage plumb surface (34), and the upper portion of the inner wall surface of the first-stage ejection channel (3) is a first-stage introduction surface (35) that contracts inward from bottom to top; The inner wall surface of the secondary ejection channel (4) is a secondary introduction surface (44) that contracts inward from bottom to top; The upper portion of the three-stage ejection channel (5) is a three-stage plumb surface (54), and the lower portion of the inner wall surface of the three-stage ejection channel (5) is a three-stage introduction surface (55) that contracts inward from bottom to top. The upper portion of the inner cylinder (1) is a contraction section (12) that contracts inward from bottom to top.

3. The cascade ejector cooling tower according to claim 2, wherein: The lower edge of the second filler (7) is higher than the input port of the first-stage ejection cavity (31), and the upper edge of the second filler (7) is lower than the contraction section (12) of the inner tube (1).

4. The cascade ejector cooling tower according to claim 1, wherein: The diameter of the liquid collecting pool (8) is not less than the diameter of the input port of the tertiary ejection channel (5).

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