Method for beautifying city environment by controlling water mist of cooling tower of central air conditioner

Abstract

The application discloses a method for beautifying urban environment by controlling water mist of a central air conditioner cooling tower, which comprises the following steps: starting the air conditioner cooling tower group, collecting the wet hot air discharged by the air conditioner cooling tower group into a gas chamber, and monitoring the temperature of the wet hot air in real time; monitoring the temperature of the ambient air in real time; when the temperature difference between the wet hot air and the ambient air is less than 10 DEG C, directly discharging the high-humidity gas in the gas chamber; when the temperature difference between the wet hot air and the ambient air is greater than 30 DEG C, introducing hot air into the gas chamber, and then discharging the mixed gas in the gas chamber, wherein the temperature difference between the hot air and the wet hot air is 10-20 DEG C; and when the temperature difference between the wet hot air and the ambient air is between 10 DEG C and 30 DEG C, introducing the ambient air and the hot air into the gas chamber, and then discharging the mixed gas in the gas chamber.

Description

Technical Field

[0001] This invention relates to the field of environmental protection, and in particular to a method for beautifying the urban environment. Background Technology

[0002] Currently, mechanical ventilation cooling towers are essential components of central air conditioning systems. These towers are used to cool water supply, ensuring the normal operation of the air conditioning units. Large and medium-sized buildings in cities, especially those with central air conditioning systems, invariably have cooling tower units installed on their rooftops.

[0003] A cooling tower is a device that uses water as a circulating coolant to absorb heat from a system and release it into the atmosphere to lower the water temperature. When hot water in the cooling tower comes into contact with airflow, heat exchange occurs, producing steam. The steam evaporates, carrying away heat through evaporation, convection, and radiation, thus dissipating waste heat generated in industrial processes to lower the water temperature and ensure the normal operation of the system.

[0004] Traditional cooling towers mainly consist of a tower body, axial flow fan, circulating water pump, water distributor, spray heads, cooling packing, water collection tank, and water collector. Process hot water is pumped to the water distributor inside the tower by the circulating water pump and then evenly sprayed onto the cooling packing through the spray heads, flowing downwards along the surface of the packing. At the same time, driven by the axial flow fan at the top of the tower, ambient cold air enters the tower through the air inlet louvers at the bottom of the tower body, passes upwards through the cooling packing layer, the water mist zone, and the water collector until it is discharged outside the tower. During this process, most of the water film formed on the surface of the cooling packing exchanges heat with the cold air and evaporates. Meanwhile, the remaining hot water and cold air come into contact and exchange heat, causing the hot water temperature to gradually decrease, thus achieving the purpose of cooling the hot water. Through heat exchange, the cold air becomes warmer, moist air and is discharged outside the tower.

[0005] However, during the heat exchange process between the cold air inside the cooling tower and the circulating water with residual heat, the evaporation of the cooling water causes the hot and humid air to carry away a large amount of heat and water vapor, resulting in high temperature and humidity. As soon as the hot and humid air is discharged from the tower and comes into contact with the cold air, it is immediately cooled and condensed to form white fog. The lower the ambient temperature, the more and denser the white fog will be, which can easily cause environmental pollution and visual obstruction.

[0006] Therefore, providing a method that can both ensure the normal operation of central air conditioning and control the water mist from the central air conditioning cooling tower to beautify the urban environment has become an urgent problem to be solved in the industry. Summary of the Invention

[0007] The purpose of this invention is to provide a method for controlling water mist from central air conditioning cooling towers to beautify the urban environment. This method can prevent water vapor condensation while ensuring the normal operation of central air conditioning, thereby reducing or eliminating water mist discharged from the cooling tower.

[0008] To achieve the above objectives, the present invention provides a method for controlling the water mist from a central air conditioning cooling tower to beautify the urban environment, comprising the following steps: (1) starting the air conditioning cooling tower group, collecting the humid and hot air discharged from the air conditioning cooling tower group into the air chamber, and monitoring the temperature of the humid and hot air in real time; (2) monitoring the temperature of the ambient air in real time; and (3) when the temperature difference between the humid and hot air and the ambient air is less than 10 degrees Celsius, directly discharging the high-humidity gas in the air chamber; when the temperature difference between the humid and hot air and the ambient air is greater than 30 degrees Celsius, introducing hot air into the air chamber, and then discharging the mixed gas in the air chamber, wherein the temperature difference between the hot air and the humid and hot air is 10 to 20 degrees Celsius; when the temperature difference between the humid and hot air and the ambient air is between 10 and 30 degrees Celsius, introducing ambient air and hot air into the air chamber, and then discharging the mixed gas in the air chamber.

[0009] Among them, the temperature of humid air is higher than that of hot air, and the temperature of hot air is higher than that of ambient air.

[0010] Optionally, in step (3), when the temperature difference between the humid air and the ambient air is greater than 30 degrees Celsius, the ratio between the intake volume of the humid air entering the air chamber and the intake volume of the hot air entering the air chamber is controlled to be 1:1 to 1:1.5.

[0011] Optionally, in step (3), when the temperature difference between the humid hot air and the ambient air is greater than 30 degrees Celsius and the temperature difference between the humid hot air and the hot air is less than 15 degrees Celsius, the ratio between the intake volume of the humid hot air entering the air chamber and the intake volume of the hot air entering the air chamber is controlled to be 1:1 to 1:1.2.

[0012] Optionally, in step (3), when the temperature difference between the humid hot air and the ambient air is greater than 30 degrees Celsius, and the temperature difference between the humid hot air and the hot air is greater than 15 degrees Celsius, the ratio between the intake volume of the humid hot air entering the air chamber and the intake volume of the hot air entering the air chamber is controlled to be 1:1.3 to 1:1.5.

[0013] Optionally, in step (3), when the temperature difference between the humid air and the ambient air is between 10 and 30 degrees Celsius, the ratio of the humid air entering the air chamber, the hot air entering the air chamber, and the ambient air entering the air chamber is controlled to be 1:1:1 to 1:1.2:1.2.

[0014] Optionally, in step (3), when the temperature difference between the humid hot air and the ambient air is between 10 and 30 degrees Celsius, and the temperature difference between the humid hot air and the hot air is less than 15 degrees Celsius, the ratio of the humid hot air entering the air chamber, the hot air entering the air chamber, and the ambient air entering the air chamber is controlled to be 1:1:1 to 1:1.2:1.

[0015] Optionally, in step (3), when the temperature difference between the humid hot air and the ambient air is between 10 and 30 degrees Celsius, and the temperature difference between the humid hot air and the hot air is greater than 15 degrees Celsius, the ratio of the humid hot air entering the air chamber, the hot air entering the air chamber, and the ambient air entering the air chamber is controlled to be 1:1:1 to 1:1.2:1.2.

[0016] Alternatively, hot air can be obtained by exchanging heat between ambient air and hot water generated by the central air conditioning system.

[0017] Preferably, a finned tube heat exchanger is used for heat exchange during the heat exchange process.

[0018] Optionally, step (1) may include the step of filtering the hot and humid air discharged from the central air conditioning cooling tower assembly and then collecting it into the air chamber.

[0019] The beneficial effects of the present invention are: (1) By obtaining the temperature of the humid and hot air discharged from the cooling tower and the ambient temperature, and by using the heat in the hot water tank of the central air conditioning system to heat the ambient air, the water mist discharged from the central air conditioning cooling tower can be reduced or eliminated under different ambient temperatures; (2) It does not require changing the structure of the original central air conditioning system, and can be achieved by adding heat exchange equipment outside, resulting in low system cost; (3) Under different ambient temperatures, the water vapor content of the exhaust can be adjusted by adjusting the air intake of ambient air, hot air and humid air into the air chamber, so that the dry and humid air can achieve the best ratio and reduce the phenomenon of water mist emission. Attached Figure Description

[0020] Figure 1 This is a schematic diagram illustrating the steps of the method for controlling water mist from a central air conditioning cooling tower to beautify the urban environment according to the present invention.

[0021] Figure 2 This is a schematic diagram of the air humidity diagram of the present invention. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] Please refer to Figure 1As a non-limiting embodiment, the method of the present invention for controlling the water mist of the central air conditioning cooling tower to beautify the urban environment firstly involves starting the air conditioning cooling tower group in step S1, collecting the hot and humid air discharged from the air conditioning cooling tower group into the air chamber, and monitoring the temperature of the hot and humid air in real time.

[0024] Next, in step S2, the temperature of the humid and hot air is monitored in real time, so that changes in the ambient temperature can be obtained in a timely and accurate manner when large temperature fluctuations occur.

[0025] Subsequently, in step S3, the operation can be performed under three temperature difference conditions.

[0026] The first scenario involves directly venting the humid air from the chamber when the temperature difference between the humid air and the ambient air is less than 10 degrees Celsius. The second scenario involves introducing hot air into the chamber when the temperature difference is greater than 30 degrees Celsius, followed by venting the mixed gas from the chamber. The temperature difference between the hot air and the humid air is 10–20 degrees Celsius. The third scenario involves introducing both ambient air and hot air into the chamber when the temperature difference is between 10 and 30 degrees Celsius, followed by venting the mixed gas from the chamber.

[0027] In this non-limiting embodiment, when the temperature difference between the humid air and the ambient air is greater than 30 degrees Celsius, the ratio between the intake volume of humid air and the intake volume of hot air entering the air chamber is controlled to be 1:1 to 1:1.5. Since there is also a temperature difference of 10 to 20 degrees Celsius between hot air and humid air, in this case, when the temperature difference between the humid air and hot air is less than 15 degrees Celsius, the ratio between the intake volume of humid air and the intake volume of hot air entering the air chamber is controlled to be 1:1 to 1:1.2. When the temperature difference between the humid air and hot air is greater than 15 degrees Celsius, the ratio between the intake volume of humid air and the intake volume of hot air entering the air chamber is controlled to be 1:1.3 to 1:1.5. This further refines the ratio of dry to humid air under different temperature differences, minimizing the amount of water mist discharged from the cooling tower.

[0028] As another non-limiting implementation, when the temperature difference between the humid hot air and the ambient air is between 10 and 30 degrees Celsius, the ratio of the intake volume of the humid hot air entering the air chamber, the intake volume of the hot air entering the air chamber, and the ambient air entering the air chamber is controlled to be 1:1:1 to 1:1.2:1.2. Similarly, specifically, when the temperature difference between the humid hot air and the hot air is less than 15 degrees Celsius, the ratio of the intake volume of the humid hot air entering the air chamber, the intake volume of the hot air entering the air chamber, and the ambient air entering the air chamber is controlled to be 1:1:1 to 1:1.2:1. When the temperature difference between the humid hot air and the hot air is greater than 15 degrees Celsius, the ratio of the intake volume of the humid hot air entering the air chamber, the intake volume of the hot air entering the air chamber, and the ambient air entering the air chamber is controlled to be 1:1:1 to 1:1.2:1.2.

[0029] In one non-limiting embodiment, this invention utilizes the heat from the large amount of hot water generated by a central air conditioning system during cooling to heat the ambient air. This achieves energy recycling. In this non-limiting embodiment, a finned tube heat exchanger is used for heat conversion because it is suitable for heat exchange between water and air and has high heat exchange efficiency.

[0030] In addition, step S1 also includes the step of filtering the hot and humid air discharged from the central air conditioning cooling tower group and then collecting it into the air chamber, so as to remove dust and impurities from the hot and humid air discharged from the cooling tower first, ensuring that the mixed gas used later does not contain impurities and avoiding secondary pollution.

[0031] In this invention, the principle that mixing the humid, hot air discharged from the cooling tower with hot air can reduce water mist emissions can be found in [reference needed]. Figure 2In the diagram, curve S1 represents the isenthalpy line of humid air with 100% humidity, curve S2 represents humid air with 80% humidity, curve S3 represents humid air with 60% humidity, curve S4 represents humid air with 40% humidity, and curve S5 represents humid air with 20% humidity. Point B represents the saturated humid air of the packing material, and point A represents the ambient air, i.e., the atmospheric state. The line connecting point B (saturated humid air of the packing material) and point A (ambient air state) is a straight line, which is the state line of the mixed gas. The state line of the mixed gas, i.e., line BA, is above the isenthalpy line, indicating a supersaturated state. Therefore, a large amount of water mist is generated outside the exhaust vent of the cooling tower. This shows that during the mixing of exhaust gas with the atmosphere, water mist will not occur as long as the mixture does not pass through the supersaturated region of humid air or the state point not on the saturated air curve. Therefore, when the ambient dry and cold air A is heated by a heat exchanger to form hot air and introduced into the air chamber, the temperature rises and becomes dry and hot air A'. It then mixes with the saturated humid and hot air B exiting the packing. The resulting gas is point C, which is unsaturated air with a significantly lower dew point. At this point, the change curve CA of the mixed gas C with the ambient dry and cold air A is below the saturated air enthalpy-humidity diagram, so no water vapor condensation occurs and the water mist basically disappears, thus achieving the purpose of reducing and eliminating water mist.

[0032] Although preferred embodiments of the invention have been described in detail herein, it should be understood that the invention is not limited to the specific structures and steps described and shown herein, and other modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the invention. Furthermore, the parameters in this invention can be appropriately selected within the scope disclosed herein according to specific usage conditions.

Claims

1. A method for controlling the water mist of a cooling tower of a central air conditioner to beautify the urban environment, characterized in that, The method comprises the following steps: (1) starting the air conditioning cooling tower group, collecting the wet hot air discharged by the air conditioning cooling tower group into the air chamber, and monitoring the temperature of the wet hot air in real time; (2) monitoring the temperature of the ambient air in real time; (3) when the temperature difference between the wet hot air and the ambient air is less than 10 degrees Celsius, directly discharging the wet hot air in the air chamber; when the temperature difference between the wet hot air and the ambient air is greater than 30 degrees Celsius, introducing hot air into the air chamber, wherein the temperature difference between the hot air and the wet hot air is 10-20 degrees Celsius, and then discharging the mixed gas in the air chamber; when the temperature difference between the wet hot air and the ambient air is between 10-30 degrees Celsius, introducing the ambient air and the hot air into the air chamber, and then discharging the mixed gas in the air chamber; in step (3), when the temperature difference between the wet hot air and the ambient air is greater than 30 degrees Celsius, the ratio between the intake amount of the wet hot air into the air chamber and the intake amount of the hot air into the air chamber is controlled to be 1:1-1:1.5; when the temperature difference between the wet hot air and the ambient air is between 10-30 degrees Celsius, the ratio between the intake amount of the wet hot air into the air chamber, the intake amount of the hot air into the air chamber, and the intake amount of the ambient air into the air chamber is controlled to be 1:1-1.2:1-1.2; and the hot air is obtained by heat exchange between the ambient air and the hot water generated by the central air conditioner; and in step (1), the wet hot air discharged by the air conditioning cooling tower group is filtered before being collected into the air chamber.

2. The method of claim 1, wherein the cooling tower water mist of the central air conditioning system is used to beautify the urban environment. in step (3), when the temperature difference between the wet hot air and the ambient air is greater than 30 degrees Celsius, and the temperature difference between the wet hot air and the hot air is less than 15 degrees Celsius, the ratio between the intake amount of the wet hot air into the air chamber and the intake amount of the hot air into the air chamber is controlled to be 1:1-1:1.

2.

3. The method of claim 1, wherein the cooling tower water mist is used to beautify the urban environment. in step (3), when the temperature difference between the wet hot air and the ambient air is greater than 30 degrees Celsius, and the temperature difference between the wet hot air and the hot air is greater than 15 degrees Celsius, the ratio between the intake amount of the wet hot air into the air chamber and the intake amount of the hot air into the air chamber is controlled to be 1:1.3-1:1.

5.

4. The method of claim 1, wherein the cooling tower water mist is used to beautify the urban environment. in step (3), when the temperature difference between the wet hot air and the ambient air is between 10-30 degrees Celsius, and the temperature difference between the wet hot air and the hot air is less than 15 degrees Celsius, the ratio between the intake amount of the wet hot air into the air chamber, the intake amount of the hot air into the air chamber, and the intake amount of the ambient air into the air chamber is controlled to be 1:1-1.2:

1.

5. The method of claim 1, wherein the cooling tower water mist is used to beautify the urban environment. In step (3), when the temperature difference between the hot and humid air and the ambient air is between 10 to 30 degrees Celsius, and the temperature difference between the hot and humid air and the hot air is greater than 15 degrees Celsius, the ratio between the intake amount of the hot and humid air into the air chamber, the intake amount of the hot air into the air chamber, and the intake amount of the ambient air into the air chamber is 1:1 to 1.2:1 to 1.2.

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