A high-efficiency energy-saving cooling tower

Abstract

The present invention relates to an efficient and energy-saving cooling tower, comprising a cooling tower body, wherein an air inlet pipe is provided at the bottom of one side, and an exhaust pipe is provided at the top of the other side, and the cooling tower also comprises a cooling water pipeline part, wherein the cooling water pipeline part comprises a cooling water pipe, a primary cooling pipe network, a secondary cooling pipe network and a hot waste water pipe; a plurality of primary cooling pipe networks are provided, and the number of secondary cooling pipe networks is the same as that of the primary cooling pipe network, a plurality of primary cooling pipe networks are fixedly arranged at the middle and upper part of the cooling tower body, and a plurality of secondary cooling pipe networks are fixedly arranged at the middle and lower part of the cooling tower body; the primary water inlet pipes of the plurality of primary cooling pipe networks are all connected to the cooling water pipe, and the secondary water outlet pipes of the plurality of secondary cooling pipe networks are all connected to the hot waste water pipe. The present invention can not only improve the cooling efficiency but also reduce the energy consumption through reasonable pipe network layout design and hierarchical cooling method.

Description

Technical Field

[0001] The invention relates to the technical field of cooling equipment, and in particular to a high-efficiency energy-saving cooling tower. Background Art

[0002] In the fields of electricity, petrochemicals, metal smelting, etc., high-temperature flue gas is usually generated. These high-temperature flue gases are directly discharged into the atmosphere, which will seriously pollute the air. Therefore, treatment equipment is usually configured to treat these high-temperature flue gases so that they meet the emission standards before being discharged. The cooling tower is a special equipment for cooling and cooling high-temperature flue gas. At present, cooling towers are divided into spray cooling towers, air-cooled cooling towers and liquid-cooled cooling towers; according to the degree of closure, they are divided into closed cooling towers and non-closed cooling towers. The cooling principle of the cooling tower is to use the cooling medium to exchange heat with high-temperature flue gas to reduce the temperature of the flue gas and achieve the purpose of cooling. Spray cooling towers are rarely used because they will produce a lot of wastewater. Air-cooled cooling towers are difficult to use for cooling flue gas due to the low specific heat of air. Liquid-cooled cooling towers are currently more commonly used. As people's environmental awareness is increasing, the requirements for controlling air pollution are also getting higher and higher. Therefore, the existing liquid-cooled cooling towers mostly adopt a closed structure design to prevent flue gas leakage during cooling. Existing liquid-cooled cooling towers are usually designed with one or more layers of cooling water coils or pipe networks, which are supplied with water by a unified cooling water pipe. The discharged hot waste water is collected through a drainage pipe and used for heating or directly discharged.

[0003] However, the existing closed liquid cooling tower has low cooling efficiency. Its coil-type structure design has a small contact area between the flue gas and the cooling pipe network when used to cool high-temperature flue gas. It requires a complex flue gas flow channel and continuous high-pressure pumping of cooling water to achieve flue gas cooling. The efficiency is low, the waste heat utilization rate is also low, and the energy consumption is high. Summary of the invention

[0004] The present invention aims at at least one technical problem existing in the prior art and provides a high-efficiency energy-saving cooling tower, which can not only improve the cooling efficiency but also reduce energy consumption through reasonable pipe network layout design and graded cooling method.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A high-efficiency and energy-saving cooling tower comprises a cooling tower body, wherein the cooling tower body is a sealed structure, an air inlet pipe is arranged at the bottom of one side, and an exhaust pipe is arranged at the top of the other side. The cooling tower also comprises a cooling water pipeline part, wherein the cooling water pipeline part comprises a cooling water pipe, a primary cooling pipe network, a secondary cooling pipe network and a hot waste water pipe; the primary cooling pipe network is provided with a plurality of the secondary cooling pipe networks, and the number of the secondary cooling pipe networks is the same as that of the primary cooling pipe network, the plurality of the primary cooling pipe networks are fixedly arranged at the middle and upper part of the cooling tower body, and the plurality of the secondary cooling pipe networks are fixedly arranged at the cooling tower The middle and lower part of the main body; the first-level cooling network includes a first-level water inlet pipe and a first-level water outlet pipe, the second-level cooling network includes a second-level water inlet pipe and a second-level water outlet pipe, and the first-level water outlet pipes of the plurality of first-level cooling networks and the second-level water inlet pipes of the plurality of second-level cooling networks are connected in sequence in a manner that the top first-level cooling network is connected to the bottom second-level cooling network, and the middle first-level cooling network is connected to the middle second-level cooling network; the first-level water inlet pipes of the plurality of first-level cooling networks are all connected to the cooling water pipe, and the second-level water outlet pipes of the plurality of second-level cooling networks are all connected to the hot waste water pipe.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the number of the first-level cooling pipe networks is 3 to 5.

[0009] Preferably, the primary cooling pipe network further comprises a plurality of primary cooling branch pipes which are arranged in parallel and are respectively connected to the primary water inlet pipe and the primary water outlet pipe on both sides.

[0010] Preferably, the secondary cooling pipe network further comprises a plurality of secondary cooling branch pipes which are arranged in parallel and are respectively connected to the secondary water inlet pipe and the secondary water outlet pipe on both sides.

[0011] Furthermore, the primary cooling pipe network and the secondary cooling pipe network are coil-type pipe networks.

[0012] Furthermore, an inner insulation layer is provided on the inner side of the cooling tower body.

[0013] Furthermore, a heat insulating layer and a heat isolating layer are provided inside the air intake pipe and the exhaust pipe, respectively.

[0014] Furthermore, a precooler is provided in the air intake pipe, and the precooler comprises a precooling water inlet pipe and a precooling water outlet pipe, the precooling water inlet pipe is connected to the hot waste water pipe, and the precooling water outlet pipe is connected to the hot water pipe.

[0015] Preferably, the precooler further comprises a plurality of precooling pipe networks, and the precooling pipe networks are parallel pipe networks or coil pipe networks.

[0016] Furthermore, a liquid receiving pan is fixedly installed at the bottom of the cooling tower body.

[0017] The beneficial effects of the present invention are as follows: the present invention designs a closed tower body, adopts a two-stage or multi-stage cooling pipe network design, and is arranged from top to bottom. The hot wastewater generated by the upper cooling pipe network is discharged into the lower cooling pipe network, and the graded cooling greatly increases the contact area between the flue gas and the cooling pipe network. Moreover, the graded cooling allows the flue gas to be cooled step by step, which can accelerate heat exchange and effectively improve the cooling efficiency. The multi-stage cooling pipe network design of the present invention can also heat the cooling water step by step. The cooling water finally discharged has a high temperature and can be widely used as a heat source in other production processes, which can greatly improve the waste heat utilization efficiency and reduce energy consumption. The present invention has a good cooling effect, does not require a large amount of cooling water to be pumped in, and can also greatly reduce the power consumption during cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an implementation mode of the present invention;

[0019] Figure 2 It is a structural schematic diagram of a primary cooling pipe network according to an embodiment of the present invention;

[0020] Figure 3 It is a structural schematic diagram of a secondary cooling pipe network according to an embodiment of the present invention;

[0021] Figure 4 It is a structural schematic diagram of another embodiment of the present invention;

[0022] Figure 5 is a schematic structural diagram of a precooler according to another embodiment of the present invention;

[0023] In the figure: 1. cooling tower body, 11. outer shell, 12. inner insulation layer, 2. air inlet pipe, 21. pipe body, 22. insulation layer, 3. exhaust pipe, 31. exhaust pipe body, 32. insulation layer, 4. cooling water pipe, 5. primary cooling network, 51. primary water inlet pipe, 52. primary cooling branch pipe, 53. primary water outlet pipe, 6. secondary cooling network, 61. secondary water inlet pipe, 62. secondary cooling branch pipe, 63. secondary water outlet pipe, 7. hot waste water pipe, 8. liquid receiving tray, 9. precooler, 91. precooling water inlet pipe, 92. precooling network, 93. precooling water outlet pipe. DETAILED DESCRIPTION

[0024] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0025] To facilitate understanding by those skilled in the art, the present invention describes the structure with Figure 1For reference to the drawings, directions such as front, back, left, right, up, and down are defined. The direction definition is only for the convenience of description and to facilitate the understanding of the structure of the present invention by those skilled in the art, and does not involve limitation of the protection scope of the present invention.

[0026] like Figure 1 As shown, an efficient and energy-saving cooling tower designed in one embodiment of the present invention includes a cooling tower body 1. The cooling tower body 1 is a sealed structure and can adopt a tower body structure similar to that of an existing closed cooling tower.

[0027] An air inlet pipe 2 is provided at the bottom of one side of the cooling tower body 1 , and an exhaust pipe 3 is provided at the top of the other side. Smoke enters the cooling tower through the air inlet pipe 2 and is discharged through the exhaust pipe 3 .

[0028] The cooling tower also includes a cooling water pipeline part, which includes a cooling water pipe 4, a primary cooling pipe network 5, a secondary cooling pipe network 6 and a hot waste water pipe 7. There are multiple primary cooling pipe networks 5, and the number of secondary cooling pipe networks 6 is the same as that of the primary cooling pipe network 5. The multiple primary cooling pipe networks 5 are fixedly arranged in the middle and upper part of the cooling tower body 1, and the multiple secondary cooling pipe networks 6 are fixedly arranged in the middle and lower part of the cooling tower body 1. The primary cooling pipe network 5 includes a primary water inlet pipe 51 and a primary water outlet pipe 53, and the secondary cooling pipe network 6 includes a secondary water inlet pipe 61 and a secondary water outlet pipe 63. The primary water outlet pipes 53 of the multiple primary cooling pipe networks 5 and the secondary water inlet pipes 61 of the multiple secondary cooling pipe networks 6 are connected in sequence in a manner that the top primary cooling pipe network 5 is connected to the bottom secondary cooling pipe network 6, and the middle primary cooling pipe network 5 is connected to the middle secondary cooling pipe network 6. For example, four layers of primary cooling pipe networks 5 and four layers of secondary cooling pipe networks 6 are set, the top primary cooling pipe network 5 is connected to the bottom secondary cooling pipe network 6, the second layer of primary cooling pipe network 5 is connected to the second-to-last layer of secondary cooling pipe network 6, the third layer of primary cooling pipe network 5 is connected to the third-to-last layer of secondary cooling pipe network 6, and the middlemost primary cooling pipe network 5 is connected to the middlemost secondary cooling pipe network 6.

[0029] The primary water inlet pipes 51 of the plurality of primary cooling pipe networks 5 are all connected to the cooling water pipe 4 , and the secondary water outlet pipes 63 of the plurality of secondary cooling pipe networks 6 are all connected to the hot waste water pipe 7 .

[0030] When in use, the flue gas enters the cooling tower body 1 from the air inlet pipe 2, flows from bottom to top, and is discharged through the exhaust pipe 3. When the flue gas flows from bottom to top, it is first cooled by the multiple secondary cooling pipe networks 6 at the bottom, and then cooled by the multiple primary cooling pipe networks 5 at the top, and discharged after being cooled step by step. The step-by-step cooling process is also a step-by-step heating process of the cooling water. Eventually, the waste heat energy of the flue gas is heat-exchanged with the cooling water in large quantities, and the temperature of the cooling water is heated to a higher temperature, and then guided to the heating unit by the hot waste water pipe 7 for use as a heat source. In this way, waste heat can be effectively utilized and energy consumption can be reduced. At the same time, step-by-step cooling, with the cooling temperature difference of each stage within a certain range, can accelerate heat exchange and improve cooling efficiency.

[0031] The present invention adopts this top-down arrangement to fully utilize gravity and achieve the flow of cooling water only by relying on the initial water pressure provided by the cooling water pipe 4. A booster pump is not required, which effectively reduces the resulting power consumption and further saves energy.

[0032] In the above-mentioned embodiment, the present invention can be further improved as follows: In the improved solution, 3 to 5 primary cooling pipe networks 5 are provided, and correspondingly, 3 to 5 secondary cooling pipe networks 6 are also provided.

[0033] In this way, a cooling pipe network with 6 to 10 layers can be formed, which effectively increases the contact between the flue gas and the cooling pipe network and further improves the cooling efficiency.

[0034] In this embodiment, the primary cooling pipe network 5 and the secondary cooling pipe network 6 can adopt a coil structure similar to the cooling pipe network of an existing cooling tower, so that the contact area can be effectively increased and the cooling efficiency can be improved.

[0035] In the above embodiment, the present invention can also be further improved as follows: In the improved solution, a liquid receiving pan 8 is fixedly installed at the bottom of the cooling tower body 1 .

[0036] By adopting this improved solution, it is possible to easily receive water droplets formed by condensation of water vapor in the flue gas due to the cooling of the flue gas.

[0037] like Figure 2 , Figure 3 As shown, there is another embodiment of the present invention. The structure of this embodiment is similar to that of the first embodiment, but the difference lies in the improvement of the structure of the cooling pipe network.

[0038] In this embodiment, the primary cooling pipe network 5 further includes a plurality of primary cooling branch pipes 52 which are arranged in parallel and are connected to the primary water inlet pipe 51 and the primary water outlet pipe 53 on both sides respectively.

[0039] In this embodiment, the secondary cooling pipe network 6 also includes a plurality of secondary cooling branch pipes 62 which are arranged in parallel and are connected to the secondary water inlet pipe 61 and the secondary water outlet pipe 63 on both sides respectively.

[0040] By adopting the parallel pipe network structure, the cooling water flows more smoothly and is easy to arrange and fix in the cooling tower body 1.

[0041] like Figure 4 As shown, the present invention has a third embodiment, and the structure of this embodiment is similar to the first two embodiments, except that a pre-cooling part is added.

[0042] In this embodiment, a precooler 9 is also provided in the air intake pipe 2, and the precooler 9 includes a precooling water inlet pipe 91 and a precooling water outlet pipe 93. The precooling water inlet pipe 91 is connected to the hot waste water pipe 7, and the precooling water outlet pipe 93 is connected to the hot water pipe (not numbered in the figure).

[0043] This embodiment utilizes the temperature difference between the wastewater in the hot wastewater pipe 7 and the initial flue gas to pre-cool the flue gas, which can further improve the cooling efficiency. At the same time, it can also further heat the hot wastewater, further improve the waste heat utilization efficiency, and further reduce energy consumption.

[0044] like Figure 5 As shown, in the above embodiment, the present invention can also be further improved as follows: In the improved solution, the precooler 9 further comprises a plurality of precooling pipe networks 92, and the precooling pipe networks 92 are parallel pipe networks or coil pipe networks.

[0045] The pre-cooling pipe network 92 of the present improvement can adopt a structure similar to the primary cooling pipe network 5, and the size design can be adapted to the air intake pipe 2. The design of multiple cooling pipe networks can effectively reduce the flue gas temperature during pre-cooling, while heating the wastewater as much as possible.

[0046] like Figure 1 As shown, the present invention also has a fourth embodiment, and the structure of this embodiment is similar to the previous three embodiments, except that a heat insulation layer is added.

[0047] In this embodiment, the cooling tower body 1 is a sealed structure, including an outer shell 11 , and an inner insulation layer 12 is arranged inside the outer shell 11 .

[0048] By adopting this implementation mode, the heat loss of flue gas can be effectively reduced, and while avoiding thermal radiation pollution, the utilization rate of waste heat can be effectively improved, thereby further saving energy consumption.

[0049] In the above embodiment, the present invention can be further improved as follows: In the improved solution, the intake pipe 2 includes a pipe body 21, and a heat insulation layer 22 is provided inside the pipe body 21; the exhaust pipe 3 includes an exhaust pipe body 31, and a heat insulation layer 32 is provided inside the exhaust pipe body 31.

[0050] By adopting this improved solution, the heat loss of flue gas can be further reduced.

[0051] In the present invention, the materials of the inner insulation layer 12 arranged in the cooling tower body 1, the insulation layer 22 arranged in the air inlet pipe 2 and the insulation layer 32 arranged in the exhaust pipe 3 are selected from existing mature insulation or heat insulating materials, such as ceramic materials and refractory bricks available on the market.

[0052] In the present invention, the cooling water pipe 4, the hot waste water pipe 7, and the hot water pipe are connected to the cooling tower body 1 and the air inlet pipe 2 by penetrating, and are sealed with existing thermal insulation adhesive materials.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-efficiency energy-saving cooling tower, comprising a cooling tower body (1), wherein the cooling tower body (1) is a sealed structure, an air inlet pipe (2) is provided at the bottom of one side, and an exhaust pipe (3) is provided at the top of the other side, wherein: The cooling tower further comprises a cooling water pipeline section, which comprises a cooling water pipe (4), a primary cooling pipe network (5), a secondary cooling pipe network (6) and a hot waste water pipe (7); a plurality of the primary cooling pipe networks (5) are provided, and the number of the secondary cooling pipe networks (6) is the same as that of the primary cooling pipe networks (5); a plurality of the primary cooling pipe networks (5) are fixedly arranged at the middle and upper part of the cooling tower body (1), and a plurality of the secondary cooling pipe networks (6) are fixedly arranged at the middle and lower part of the cooling tower body (1); the primary cooling pipe network (5) comprises a primary water inlet pipe (51) and a primary water outlet pipe (53); the secondary cooling pipe network (5) comprises a primary water inlet pipe (51) and a primary water outlet pipe (53); The first-stage cooling pipe network (6) comprises a second-stage water inlet pipe (61) and a second-stage water outlet pipe (63); the first-stage water outlet pipes (53) of the plurality of first-stage cooling pipe networks (5) and the second-stage water inlet pipes (61) of the plurality of second-stage cooling pipe networks (6) are connected in sequence in such a manner that the top first-stage cooling pipe network (5) is connected to the bottom second-stage cooling pipe network (6), and the middle first-stage cooling pipe network (5) is connected to the middle second-stage cooling pipe network (6); the first-stage water inlet pipes (51) of the plurality of first-stage cooling pipe networks (5) are all connected to the cooling water pipe (4), and the second-stage water outlet pipes (63) of the plurality of second-stage cooling pipe networks (6) are all connected to the hot waste water pipe (7).

2. A high-efficiency energy-saving cooling tower according to claim 1, characterized in that: The first-level cooling pipe network (5) is provided in 3 to 5 pieces.

3. A high-efficiency energy-saving cooling tower according to claim 2, characterized in that: The primary cooling pipe network (5) further comprises a plurality of primary cooling branch pipes (52) arranged in parallel and connected to the primary water inlet pipe (51) and the primary water outlet pipe (53) on both sides respectively.

4. A high-efficiency energy-saving cooling tower according to claim 2, characterized in that: The secondary cooling pipe network (6) further comprises a plurality of secondary cooling branch pipes (62) arranged in parallel and connected to the secondary water inlet pipe (61) and the secondary water outlet pipe (63) on both sides respectively.

5. The high-efficiency energy-saving cooling tower according to claim 1 is characterized in that: The primary cooling pipe network (5) and the secondary cooling pipe network (6) are coil-type pipe networks.

6. The high-efficiency energy-saving cooling tower according to claim 1, characterized in that: An inner heat insulating layer (12) is provided inside the cooling tower body (1).

7. The high-efficiency energy-saving cooling tower according to claim 1, characterized in that: A heat insulating layer (22) and a heat insulating layer (32) are respectively provided inside the air intake pipe (2) and the exhaust pipe (3).

8. The high-efficiency energy-saving cooling tower according to claim 1, characterized in that: A precooler (9) is also provided in the air inlet pipe (2), and the precooler (9) comprises a precooling water inlet pipe (91) and a precooling water outlet pipe (93), wherein the precooling water inlet pipe (91) is connected to the hot waste water pipe (7), and the precooling water outlet pipe (93) is connected to the hot water pipe.

9. A high-efficiency energy-saving cooling tower according to claim 8, characterized in that: The precooler (9) further comprises a plurality of precooling pipe networks (92), wherein the precooling pipe networks (92) are parallel pipe networks or coil pipe networks.

10. The high-efficiency energy-saving cooling tower according to claim 1, characterized in that: A liquid receiving pan (8) is fixedly mounted on the bottom of the cooling tower body (1).

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