Method for removing haze in city by using air-conditioning cooling tower group

Abstract

The present invention discloses a method for removing haze in cities by using an air-conditioning cooling tower group, which includes: starting the air-conditioning cooling tower group, collecting the humid and hot air discharged from the air-conditioning cooling tower group into an air chamber; monitoring the temperature and humidity of the humid and hot air in real time; drawing an enthalpy-humidity diagram of the air according to the temperature and humidity of the humid and hot air to obtain the isenthalpic line of the saturated humid and hot air; monitoring the temperature and humidity of the ambient air in real time; drawing a mixed gas state line on the enthalpy-humidity diagram according to the temperature of the humid and hot air obtained by real-time monitoring and the temperature of the ambient air. When the mixed gas state line does not pass through the supersaturated region of the moist air in the enthalpy-humidity diagram and is not on the isenthalpic line of the saturated humid and hot air, continue to collect the humid and hot air; when the mixed gas state line passes through the supersaturated region of the moist air in the enthalpy-humidity diagram or is on the isenthalpic line of the saturated humid and hot air, pressurize and discharge the humid and hot air discharged from the air-conditioning cooling tower group collected in the air chamber to mix it with the ambient air to form water mist.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection, and in particular to a method for eliminating urban haze. Background Art

[0002] Currently, mechanical ventilation cooling towers are essential components for central air conditioning systems. Cooling towers are required to cool the water supply and ensure the proper operation of the air conditioning units. Large and medium-sized urban buildings, including those with central air conditioning, often have cooling towers installed on their rooftops. Cooling towers typically operate during the three months of summer and remain idle the rest of the year, particularly in autumn and winter.

[0003] A cooling tower is a device that uses water as a circulating coolant, absorbing heat from a system and releasing it into the atmosphere to lower the water temperature. Hot water in the cooling tower interacts with the flowing air, generating steam. This steam evaporates and removes heat through evaporative heat transfer, convection heat transfer, and radiation heat transfer. This dissipates industrial waste heat, lowering the water temperature and ensuring the proper operation of the system.

[0004] The traditional cooling tower is mainly composed of a tower body, an axial flow fan, a circulating water pump, a water distributor, a sprinkler head, a cooling filler, a water collection tank and a water collector. The process hot water is pumped by the circulating water pump to the water distributor inside the tower, and is evenly sprayed on the cooling filler through the sprinkler head, and flows downward along the filler surface. At the same time, driven by the fan blades of the axial flow fan at the top of the tower, the ambient cold air enters the tower from the air intake louver window at the lower part of the tower body, passes upward through the cooling filler layer, the water mist area and the water collector until it is discharged out of the tower. In this process, most of the water film formed on the surface of the cooling filler exchanges heat with the cold air and evaporates. At the same time, the remaining hot water and the cold air are in contact and heat exchange, so that the temperature of the hot water gradually decreases, thereby achieving the purpose of cooling the hot water. Through heat exchange, the cold air becomes hot and humid air with a higher temperature and is discharged out of the tower.

[0005] During the heat exchange process between the cold air in the cooling tower and the circulating water with waste heat, the hot and humid air takes away a large amount of heat and water vapor due to the evaporation of the cooling water, making the temperature and humidity of the hot and humid air higher. Once 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 mist. The lower the external ambient temperature, the more and thicker the white mist will be.

[0006] At present, in order to control urban smog and excessive particulate matter content, the sanitation department uses a large number of sprinkler trucks and fog cannon trucks, which operate in the city in a mobile, intermittent and circular manner.

[0007] Since the cooling towers of central air conditioners have the function of generating fog, in the autumn and winter when haze is prevalent, a large number of scattered fixed cooling towers in the city can be converted into fixed-position water cannon devices by adding atomizers to the water replenishment devices without affecting their summer heat dissipation function, which will help to remove haze and reduce the content of particulate matter in the city.

[0008] An atomizing device using the condensed water of a central air conditioner disclosed in Chinese Patent Application Publication No. 201820451528.4 includes a first water pipe. One end of the first water pipe is connected to the air conditioner water outlet pipe, and the other end of the first water pipe is connected to a water storage tank. One end of a second water pipe is also connected to the water storage tank, and the other end of the second water pipe is connected to a water purification tank. One end of a third water pipe is also connected to the water purification tank, and the other end of the third water pipe is connected to an atomizer. The atomizer is connected to an atomizing pipe, and the other end of the atomizing pipe is connected to an atomizing nozzle. It also includes a liquid medicine tank containing a bactericidal and disinfectant liquid medicine, and the liquid medicine tank is connected to the atomizer through a fourth water pipe. However, the atomizing device using the condensed water of the central air conditioner in this patent application requires the use of an atomizer and an atomizing nozzle, and it does not achieve the purpose of reducing haze by discharging water mist from the air conditioner cooling tower.

[0009] Therefore, providing a method for using an air conditioner cooling tower group to remove haze from the city that can ensure the normal use of the central air conditioner and has an anti-haze function has become an urgent problem to be solved in the industry. Summary of the Invention

[0010] The object of the present invention is to provide a method for using an air conditioner cooling tower group to remove haze from the city. It can, while ensuring the normal use of the central air conditioner, add an air chamber at the exhaust chimney opening of the cooling tower, adjust the humid and hot air discharged from the cooling tower to form atomized water vapor with the ambient air, spray the atomized water into the sky, form a fixed water cannon effect, and then achieve the effect of preventing haze and removing fog.

[0011] To achieve the above object, the present invention provides a method for using an air conditioner cooling tower group to remove haze from the city, which includes the following steps: (1) Start the air conditioner cooling tower group and collect the humid and hot air discharged from the air conditioner cooling tower group into the air chamber; (2) Real-time monitor the temperature and humidity of the humid and hot air; (3) Draw an air enthalpy-humidity diagram based on the temperature and humidity of the humid and hot air to obtain the isenthalpic line of saturated humid and hot air; (4) Real-time monitor the temperature and humidity of the ambient air; and (5) According to the temperature of the humid and hot air obtained by real-time monitoring and the temperature of the ambient air, draw a mixed gas state line on the air enthalpy-humidity diagram. When the mixed gas state line does not pass through the supersaturated region of the humid air in the air enthalpy-humidity diagram and is not on the isenthalpic line of saturated humid and hot air, continue to collect the humid and hot air discharged from the air conditioner cooling tower group; when the mixed gas state line passes through the supersaturated region of the humid air in the air enthalpy-humidity diagram or is on the isenthalpic line of saturated humid and hot air, pressurize and discharge the humid and hot air discharged from the air conditioner cooling tower group collected in the air chamber to mix it with the ambient air to form water mist to reduce the haze in the city.

[0012] Optionally, in step (5), when the mixed gas state line does not pass through the supersaturated region of the humid air in the psychrometric chart and is not on the isenthalpic line of the saturated humid hot air, the ambient air is cooled by a cooling device until the mixed gas state line obtained from the temperature of the humid hot air acquired through real-time monitoring and the ambient air that has been cooled passes through the supersaturated region of the humid air in the psychrometric chart or is on the isenthalpic line of the saturated humid hot air. Then, after introducing a part of the ambient air that has been cooled into the air chamber, the mixed gas in the air chamber is discharged.

[0013] Optionally, during the process of cooling the ambient air by the cooling device, the temperature difference between the ambient air and the humid hot air in the air chamber is controlled to be 30 - 40 degrees Celsius, where the temperature of the humid hot air is higher than that of the ambient air.

[0014] Optionally, in step (5), the humid hot air discharged from the air-conditioning cooling tower group collected in the air chamber is discharged under a pressure of 2 - 2.5 atmospheres.

[0015] Optionally, in step (5), the humid hot air is discharged into the atmosphere using a multi-head nozzle.

[0016] Preferably, the multi-head nozzle has three nozzles, and the three nozzles are arranged in an equilateral triangle.

[0017] Optionally, in step (5), it further includes discriminating the direction and intensity of the haze and adjusting the spraying direction of the mixed gas.

[0018] Optionally, in step (5), the humid hot air is discharged into the atmosphere using a nozzle with an adjustable head angle.

[0019] Optionally, in step (1), it includes the step of filtering the humid hot air discharged from the air-conditioning cooling tower group and then collecting it into the air chamber.

[0020] The beneficial effects of the present invention are as follows: (1) According to the temperature and humidity of the humid hot air discharged from the cooling tower and the temperature and humidity of the ambient air, the exhaust gas can be adjusted into a water mist shape and sprayed into the sky, forming a fixed water cannon effect to achieve the effect of preventing haze and removing fog; (2) There is no need to change the structure of the original central air-conditioning system, and the cost is low; (3) The spraying direction and intensity can be adjusted at any time according to the direction and concentration of the haze, further improving the effect of preventing haze and removing fog. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the steps of the method for removing haze from the city using the air-conditioning cooling tower group of the present invention.

[0022] Figure 2 It is a schematic diagram of the psychrometric chart of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having like or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and intended to explain the present invention and should not be construed as limiting the present invention.

[0024] Please refer to Figure 1 , as a non-limiting embodiment, the method for removing haze in the city by using an air-conditioning cooling tower group according to the present invention is as follows. First, in step S1, start the air-conditioning cooling tower group and collect the hot and humid air discharged from the air-conditioning cooling tower group into the air chamber.

[0025] Next, in step S2, the temperature and humidity of the hot and humid air are monitored in real time, so that once a large temperature fluctuation occurs, the changes in temperature and humidity can be accurately obtained in a timely manner.

[0026] Subsequently, in step S3, based on the temperature and humidity of the hot and humid air obtained in step S2, a psychrometric chart is drawn, and the equal-enthalpy line of saturated hot and humid air is drawn on the psychrometric chart. As Figure 2 shown, curve Q1 is the equal-enthalpy line of hot and humid air with a humidity of 100%, curve Q2 is the equal-enthalpy line of hot and humid air with a humidity of 80%, curve Q3 is the equal-enthalpy line of hot and humid air with a humidity of 60%, curve Q4 is the equal-enthalpy line of hot and humid air with a humidity of 40%, and curve Q5 is the equal-enthalpy line of hot and humid air with a humidity of 20%.

[0027] Then, in step S4, the temperature and humidity of the ambient air are monitored in real time.

[0028] Finally, in step S5, based on the temperature of the hot and humid air obtained by real-time monitoring and the temperature of the ambient air, a mixed gas state line is drawn on the psychrometric chart. As Figure 2 shown, in the figure, B is the saturated hot and humid air of the packing, and point A is the ambient air, that is, the atmospheric state. The connection line between the saturated hot and humid air state B point at the outlet of the packing and the ambient air state A point is a straight line, that is, the mixed gas state line is obtained. When the mixed gas state line does not pass through the supersaturated region of the humid air in the psychrometric chart and is not on the equal-enthalpy line of the saturated hot and humid air, the hot and humid air discharged from the air-conditioning cooling tower group is continuously collected; when the mixed gas state line passes through the supersaturated region of the humid air in the psychrometric chart or is on the equal-enthalpy line of the saturated hot and humid air, the hot and humid air discharged from the air-conditioning cooling tower group collected in the air chamber is pressurized and discharged to mix with the ambient air to form a water mist to reduce the urban haze. That is, as Figure 2 shown in the relaxation state between the cooling tower exhaust gas and the atmosphere, the BA line is above the equal-enthalpy line and belongs to the supersaturated state. Therefore, a large amount of water mist is generated outside the exhaust port of the cooling tower.

[0029] As another non - restrictive embodiment, in step S5, when the mixed gas state line does not pass through the supersaturated region of humid air in the psychrometric chart and is not on the isenthalpic line of saturated humid and hot air, the ambient air is cooled by a cooling device until the temperature of the humid and hot air obtained by real - time monitoring and the mixed gas state line of the cooled ambient air pass through the supersaturated region of humid air in the psychrometric chart or are on the isenthalpic line of saturated humid and hot air. Then, after introducing a part of the cooled ambient air into the air chamber, the mixed gas in the air chamber is discharged.

[0030] In this non - restrictive embodiment, during the process of cooling the ambient air by the cooling device, the temperature difference between the ambient air and the humid and hot air in the air chamber is controlled to be 30 - 40 degrees Celsius, and then the mixed gas state line is drawn, thereby reducing the drawing workload and improving the discharge efficiency.

[0031] In step (5), the humid and hot air discharged from the air - conditioning cooling tower group collected in the air chamber is pressurized and discharged at a pressure of 2 - 2.5 atmospheres, which is beneficial to the haze - removing effect of the aerosol.

[0032] Furthermore, in order to optimize the haze - removing effect, the humid and hot air can be discharged into the atmosphere by using a multi - head nozzle.

[0033] As yet another non - restrictive embodiment, further in step S5, it includes the step of monitoring the coming direction and intensity of the haze and adjusting the spraying direction of the mixed gas. Correspondingly, the pressurized nozzle is set as a nozzle with an adjustable head angle, so that the spraying direction of the water mist can be changed according to the coming direction of the haze obtained by monitoring.

[0034] To ensure the cleanliness of the spray, in step S1, it also includes the step of filtering the humid and hot air discharged from the air - conditioning cooling tower group and then collecting it into the air chamber, so as to first remove the dust and impurities in the humid and hot air discharged from the cooling tower, ensure that the water mist sprayed into the atmosphere does not contain impurities, and avoid secondary pollution of the atmosphere.

[0035] Although the preferred embodiments of the present invention have been described in detail herein, it should be understood that the present invention is not limited to the specific structures and steps described and illustrated here. Other variations and modifications can be implemented by those skilled in the art without departing from the essence and scope of the present invention. In addition, the parameters in the present invention can be appropriately selected within the scope disclosed in the present invention according to specific usage conditions.

Claims

1. A method for removing haze from a city using an air conditioning cooling tower group, characterized in that: The steps include: (1) starting the air conditioning cooling tower group and collecting the hot and humid air discharged from the air conditioning cooling tower group into the air chamber; (2) Real-time monitoring of the temperature and humidity of the hot and humid air; (3) Drawing an air psychrometric diagram based on the temperature and humidity of the saturated hot and humid air to obtain the isenthalpy lines of the saturated hot and humid air; (4) Real-time monitoring of ambient air temperature and humidity; and (5) Based on the temperature of the hot and humid air and the temperature of the ambient air obtained through real-time monitoring, a mixed gas state line is drawn on the air humidification diagram. When the mixed gas state line does not pass through the wet air supersaturation area in the air psychrometric diagram and is not on the isenthalpy line of the saturated wet hot air, the wet hot air discharged from the air conditioning cooling tower group continues to be collected; When the mixed gas state line passes through the humid air supersaturation area in the air psychrometric diagram or is on the isenthalpy line of the saturated humid air, the high-humidity air discharged from the air conditioning cooling tower group collected in the air chamber is pressurized and discharged to mix with the ambient air to form water mist to reduce urban smog; Wherein, in step (5), when the mixed gas state line does not pass through the wet air supersaturation area in the air psychrometric diagram and is not on the isenthalpy line of the saturated wet air, The ambient air is cooled by a cooling device until the mixed gas state line obtained according to the temperature of the hot and humid air obtained by real-time monitoring and the cooled ambient air passes through the humid air supersaturation area in the air psychrometric diagram or is on the isenthalpy line of the saturated hot and humid air, and then a portion of the cooled ambient air is introduced into the air chamber, and then the mixed gas in the air chamber is discharged; Furthermore, in the process of cooling the ambient air by the cooling device, the temperature difference between the ambient air and the hot and humid air in the air chamber is controlled to be 30 to 40 degrees Celsius.

2. The method for removing haze from a city by using an air conditioning cooling tower group according to claim 1, wherein: In step (5), the hot and humid air discharged from the air conditioning cooling tower group collected in the air chamber is pressurized and discharged using a pressure of 2 to 2.5 atmospheres.

3. The method for removing haze from a city by using an air conditioning cooling tower group as claimed in claim 2, characterized in that: In step (5), the hot and humid air is discharged into the atmosphere using a multi-head nozzle.

4. The method for removing haze from a city by using an air conditioning cooling tower group as claimed in claim 1, characterized in that: Step (5) also includes determining the direction and intensity of the haze and adjusting the injection direction of the mixed gas.

5. The method for removing haze from a city by using an air conditioning cooling tower group as claimed in claim 4, characterized in that: In step (5), the hot and humid air is discharged into the atmosphere using a nozzle with an adjustable head angle.

6. The method for removing haze in a city by using an air conditioning cooling tower group according to any one of claims 1 to 5, characterized in that: Step (1) includes: filtering the hot and humid air discharged from the air-conditioning cooling tower group and then collecting it into the air chamber.

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