Energy-saving cooling tower

Abstract

The utility model relates to an energy-saving cooling tower which comprises a cooling tower body, an air outlet control air duct, an air-air heat exchanger and a plate heat exchanger, the air outlet control air duct comprises a ventilation duct, a first air outlet air valve and a second air outlet air valve, an air outlet of the cooling tower body is communicated with an air inlet port of the ventilation duct, and a second air outlet port of the ventilation duct is communicated with external space. A first air outlet port of the ventilation channel communicates with a cold channel inlet of the air-air heat exchanger, a cold channel outlet of the air-air heat exchanger communicates with the external space, a hot channel inlet of the air-air heat exchanger communicates with the external space, and a hot channel outlet of the air-air heat exchanger communicates with an air inlet of the cooling tower body. A water inlet of the cooling tower body is communicated with a cold end outlet of the plate heat exchanger, and a cold end inlet of the plate heat exchanger is communicated with a water outlet of the cooling tower body. The water outlet temperature of the cooling tower is reduced compared with that before the air-air heat exchanger is added, and the energy-saving effect is achieved.

Description

Technical Field

[0001] The utility model relates to the field of cooling towers, in particular to an energy-saving cooling tower. Background Art

[0002] At present, the air discharged from the cooling tower is directly discharged into the atmosphere through the fan. In fact, the air temperature is lower than the ambient air at this time. If this part of the cold source can be recycled, the power consumption of the cooling tower will be greatly reduced. Utility Model Content

[0003] In order to overcome the deficiencies of existing products and technologies, the utility model provides an energy-saving cooling tower, which only adds an air-to-air heat exchanger and a wind valve without adding additional electrical components. The outlet water temperature is lower than that before the air-to-air heat exchanger is added, thereby achieving an energy-saving effect.

[0004] The technical solution of the implementation case of the utility model is as follows:

[0005] An energy-saving cooling tower comprises a cooling tower body, an air outlet control duct, an air-to-air heat exchanger, and a plate heat exchanger, wherein the air outlet control duct comprises a ventilation duct, a first air outlet air valve, and a second air outlet air valve, wherein the first air outlet air valve is located at a first air outlet of the ventilation duct, and the second air outlet air valve is located at a second air outlet of the ventilation duct, wherein the air outlet of the cooling tower body is communicated with an air inlet port of the ventilation duct, the second air outlet port of the ventilation duct is communicated with an external space, and the first air outlet port of the ventilation duct is communicated with an air inlet port of a cold channel of the air-to-air heat exchanger. The outlet of the air-to-air heat exchanger is connected with the external space through a pipeline, the hot channel inlet of the air-to-air heat exchanger is connected with the external space through a pipeline, the hot channel outlet of the air-to-air heat exchanger is connected with the air inlet of the cooling tower body through a pipeline, the water inlet of the cooling tower body is connected with the cold end outlet of the plate heat exchanger through a pipeline, the cold end inlet of the plate heat exchanger is connected with the water outlet of the cooling tower body through a pipeline, and the hot end inlet and hot end outlet of the plate heat exchanger are connected with the external chilled water pipe network.

[0006] Preferably, the cooling tower body includes a tower body, a water distributor, fillers, a water storage tank, a cooling pump, a fan, and a controller. The filler is located at the air inlet of the tower body, the water distributor is located above the filler, and the water storage tank is located below the filler. The water inlet end of the cooling pump is connected to the water storage tank through a pipeline, and the water outlet end of the cooling pump is connected to the cold end inlet of the plate heat exchanger through a pipeline. The fan is located at the top of the tower body, and the fan, the first air outlet valve, the second air outlet valve, the fan, the cooling pump and the controller are electrically connected.

[0007] Preferably, the cooling tower also includes a precooling surface cooler and a precooling water pump. The precooling surface cooler is located at the front end of the air inlet direction of the filler. The water inlet end of the precooling surface cooler is connected to the water outlet end of the precooling water pump through a pipeline. The water inlet end of the precooling water pump is connected to the water storage tank through a pipeline. The water outlet end of the precooling surface cooler is connected to the water distributor through a pipeline.

[0008] Compared with the prior art, the beneficial effects of the present invention are:

[0009] By only adding an air-to-air heat exchanger and a damper without any additional electrical components, the outlet water temperature of the cooling tower is lower than that before adding the air-to-air heat exchanger after the first-stage cooling of the air-to-air heat exchanger, achieving an energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structural principle of an energy-saving cooling tower in the utility model;

[0011] 11. Tower body; 12. Water distributor; 13. Filler; 14. Water storage tank; 15. Cooling pump; 16. Fan; 17. Precooling water pump; 18. Precooling surface cooler; 21. Ventilation duct; 22. First air outlet valve; 23. Second air outlet valve; 30. Air-to-air heat exchanger; 40. Plate heat exchanger. DETAILED DESCRIPTION

[0012] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0013] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0014] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0015] like Figure 1 As shown, Figure 1Schematic diagram of the structural principle of an energy-saving cooling tower in the utility model; an energy-saving cooling tower, including a cooling tower body, an air outlet control air duct, an air-to-air heat exchanger 30, and a plate heat exchanger 40, wherein the air outlet control air duct includes a ventilation duct 21, a first air outlet air valve 22, and a second air outlet air valve 23, wherein the first air outlet air valve 22 is located at a first air outlet of the ventilation duct 21, and the second air outlet air valve 23 is located at a second air outlet of the ventilation duct 21, wherein the air outlet of the cooling tower body is connected to the air inlet port of the ventilation duct 21, and the second air outlet port of the ventilation duct 21 is connected to the external space, and the first air outlet of the ventilation duct 21 is connected to the air inlet port of the ventilation duct 21. The air port is connected to the cold channel inlet of the air-to-air heat exchanger 30 through a pipeline, the cold channel outlet of the air-to-air heat exchanger 30 is connected to the external space through a pipeline, the hot channel inlet of the air-to-air heat exchanger 30 is connected to the external space through a pipeline, the hot channel outlet of the air-to-air heat exchanger 30 is connected to the air inlet of the cooling tower body through a pipeline, the water inlet of the cooling tower body is connected to the cold end outlet of the plate heat exchanger 40 through a pipeline, the cold end inlet of the plate heat exchanger 40 is connected to the water outlet of the cooling tower body through a pipeline, and the hot end inlet and hot end outlet of the plate heat exchanger 40 are connected to the external chilled water network.

[0016] As for the specific structure of the cooling tower, preferably, the cooling tower body includes a tower body 11, a water distributor 12, a filler 13, a water storage tank 14, a cooling pump 15, a fan 16, and a controller. The filler 13 is located at the air inlet of the tower body 11, the water distributor 12 is located above the filler 13, and the water storage tank 14 is located below the filler 13. The water inlet end of the cooling pump 15 is connected to the water storage tank 14 through a pipeline, and the water outlet end of the cooling pump 15 is connected to the cold end inlet of the plate heat exchanger 40 through a pipeline. The fan 16 is located at the top of the tower body 11, and the fan 16, the first air outlet valve 22, the second air outlet valve 23, the fan 16, the cooling pump 15 and the controller are electrically connected.

[0017] The cooling tower of the utility model is mainly composed of a fan, an air duct, a water distributor, a filler, a water storage tank, an air-to-air heat exchanger, a first air outlet valve, a second air outlet valve, and a plate heat exchanger. The fan outlet is connected to the ventilation duct, which is connected to the heat exchanger on one side and the external environment on the other side. The external environment air exchanges heat with the exhaust air of the cooling tower through the air-to-air heat exchanger, and the waste heat of the cooled exhaust gas is reused. The ambient air is pre-cooled at the primary level and enters the filler to complete the air side circulation; the cooling water enters the water distributor, is sprinkled in the filler, exchanges heat with the pre-cooled air, flows into the water storage tank after cooling, and finally flows to the plate heat exchanger under the action of the cooling pump to exchange heat with the external hot chilled water.

[0018] The heat exchange evaporation exhaust of the cooling tower is generally lower than that of the ambient air, but the relative humidity of the exhaust air is close to saturation and cannot be used directly. At this time, the air-to-air heat exchanger is used to exchange heat but not quality, and does not change the humidity of the ambient air, but can reduce the dry bulb temperature of the ambient air, thereby fully utilizing the waste heat of the cooling tower exhaust gas.

[0019] By detecting the exhaust temperature of the cooling tower, the internal controller decides whether to open the first air outlet valve or the second air outlet valve, and use the air-to-air heat exchanger for heat exchange to avoid a counter-effect. When the exhaust temperature of the cooling tower is less than the ambient air temperature, the first air outlet valve is opened and the second air outlet valve is closed. The exhaust of the cooling tower is sent to the air-to-air heat exchanger through the ventilation duct by the power of the fan, and blown out of the tower after heat exchange with the ambient air. After the ambient air is pre-cooled after passing through the air-to-air heat exchanger, it conducts heat and mass transfer with the high-temperature cooling water on the filler, and finally blows to the air-to-air heat exchanger through the suction force of the fan to complete the air side heat exchange cycle. When the exhaust temperature of the cooling tower is ≥ the ambient air temperature: the first air outlet valve is closed and the second air outlet valve is opened. At this time, the air outlet of the cooling tower is discharged into the external ambient air.

[0020] In order to further reduce the inlet air temperature, preferably, the cooling tower also includes a precooling surface cooler 18 and a precooling water pump 17. The precooling surface cooler 18 is located at the front end of the air inlet direction of the filler 13. The water inlet end of the precooling surface cooler 18 is connected to the water outlet end of the precooling water pump 17 through a pipe, the water inlet end of the precooling water pump 17 is connected to the water storage tank 14 through a pipe, and the water outlet end of the precooling surface cooler 18 is connected to the water distributor 12 through a pipe.

[0021] By adding a precooling surface cooler at the air inlet of the filler, the external air is precooled for a second time and the temperature is further reduced. The cold water of the precooling surface cooler comes from the water storage tank and is transported to the precooling surface cooler through a precooling water pump.

[0022] When the exhaust temperature of the cooling tower is less than the ambient air temperature, the first air outlet valve is opened and the second air outlet valve is closed. The exhaust of the cooling tower is sent to the air-to-air heat exchanger through the ventilation duct by the power of the fan. After exchanging heat with the ambient air, it is blown out of the tower. After passing through the air-to-air heat exchanger, the ambient air undergoes a primary precooling, and then a secondary precooling by sensible heat exchange with the precooling surface cooler. Then, on the filler, it undergoes a heat and mass transfer process with the high-temperature cooling water. Finally, through the suction force of the fan, it is blown to the air-to-air heat exchanger to complete the air-side heat exchange cycle. When the exhaust temperature of the cooling tower is ≥ the ambient air temperature: the first air outlet valve is closed and the second air outlet valve is opened. At this time, the air outlet of the cooling tower is discharged into the external ambient air. At this time, the ambient air only undergoes a primary cooling process of the precooling surface cooler, and then is sucked into the filler for a heat and mass transfer process with the high-temperature cooling water.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] By only adding an air-to-air heat exchanger and a damper without any additional electrical components, the outlet water temperature of the cooling tower is lower than that before adding the air-to-air heat exchanger after the first-stage cooling of the air-to-air heat exchanger, achieving an energy-saving effect.

[0025] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0026] The above embodiments only express the preferred implementation of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An energy-saving cooling tower, characterized in that: The invention comprises a cooling tower body, an air outlet control duct, an air-to-air heat exchanger, and a plate heat exchanger, wherein the air outlet control duct comprises a ventilation duct, a first air outlet valve, and a second air outlet valve, wherein the first air outlet valve is located at the first air outlet of the ventilation duct, and the second air outlet valve is located at the second air outlet of the ventilation duct, the air outlet of the cooling tower body is communicated with the air inlet port of the ventilation duct, the second air outlet port of the ventilation duct is communicated with the external space, the first air outlet port of the ventilation duct is communicated with the cold channel inlet of the air-to-air heat exchanger through a pipeline, the cold channel outlet of the air-to-air heat exchanger is communicated with the external space through a pipeline, the hot channel inlet of the air-to-air heat exchanger is communicated with the external space through a pipeline, the hot channel outlet of the air-to-air heat exchanger is communicated with the air inlet of the cooling tower body through a pipeline, the water inlet of the cooling tower body is communicated with the cold end outlet of the plate heat exchanger through a pipeline, the cold end inlet of the plate heat exchanger is communicated with the water outlet of the cooling tower body through a pipeline, and the hot end inlet and hot end outlet of the plate heat exchanger are communicated with the external chilled water network.

2. The energy-saving cooling tower according to claim 1, characterized in that: The cooling tower body includes a tower body, a water distributor, a filler, a water storage tank, a cooling pump, a fan, and a controller. The filler is located at the air inlet of the tower body, the water distributor is located above the filler, and the water storage tank is located below the filler. The water inlet end of the cooling pump is connected to the water storage tank through a pipeline, and the water outlet end of the cooling pump is connected to the cold end inlet of the plate heat exchanger through a pipeline. The fan is located at the top of the tower body, and the fan, the first air outlet valve, the second air outlet valve, the cooling pump and the controller are electrically connected.

3. The energy-saving cooling tower according to claim 2, characterized in that: The cooling tower also includes a precooling surface cooler and a precooling water pump. The precooling surface cooler is located at the front end of the air inlet direction of the filler. The water inlet end of the precooling surface cooler is connected to the water outlet end of the precooling water pump through a pipeline. The water inlet end of the precooling water pump is connected to the water storage tank through a pipeline. The water outlet end of the precooling surface cooler is connected to the water distributor through a pipeline.

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