Calculation method for regulating and controlling opening degree of shutter of wind shielding device of indirect air cooling tower

Abstract

The invention provides a method for calculating the regulation and control opening degree of a shutter of a wind shielding device of an indirect air cooling tower, and the regulation and control opening degree of the shutter of the wind shielding device is calculated by comprehensively considering environmental meteorological data, wind speed and wind direction data of the shutter of the wind shielding device, wall temperature data of a cooling triangle, wind speed and wind direction data of an inlet tower and the opening degree of the shutter of the wind shielding device. The wind shielding device shutters adopt a combined regulation and control mode, real-time regulation and control of the wind shielding device shutters under different working conditions are achieved, and therefore the efficiency of the air cooling system is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of cooling towers, and particularly relates to a calculation method for regulating the opening degree of louvers of a wind shielding device for an indirect air-cooled tower. Particularly relates to a calculation method for regulating the opening degree of louvers of a wind shielding device for an indirect air-cooled tower. Particularly relates to a calculation method for regulating the opening degree of louvers of a wind shielding device for an indirect air-cooled tower. Background Art

[0002] Indirect air cooling, as a cooling technology for air-cooled towers, its operating mechanism is to transfer the heat of hot water to the heat dissipation tubes on the cooling triangles, and then transfer the heat to the atmosphere through the contact between the heat dissipation tubes and the air. With the continuous expansion of the scale of air-cooled towers, their heat dissipation efficiency is increasingly restricted by atmospheric environmental conditions. In particular, in a strong wind environment, the heat dissipation performance of air-cooled towers shows significant differences. The cooling triangles on the windward side benefit from the increased cold air flow rate, and their heat dissipation capacity is enhanced; while the cooling triangles on the leeward side have their heat dissipation capacity weakened due to the reduced cold air flow rate. This significant difference in heat dissipation capacity between different fan segments affects the overall heat dissipation efficiency of the air-cooled tower.

[0003] The wind speed and wind direction data around the wind shielding device of the indirect cooling tower affect the opening angle of the louvers. By adjusting the opening degree of the louvers of the wind shielding device, the direction of the ambient air flow through the indirect cooling tower can be adjusted, the influence of vortex generation can be reduced, the air intake of the air-cooling system can be increased, and the efficiency of the air-cooling system can be improved. At the same time, through this control method, the input of manpower and material resources can be effectively reduced. However, currently, the regulation of the opening degree of the louvers of the wind shielding device of the indirect cooling tower is mostly based on empirical values, and there is a lack of a calculation method for regulating the opening degree of the louvers of the wind shielding device under different working conditions. Summary of the Invention

[0004] The purpose of the present invention is to provide a calculation method for regulating the opening degree of louvers of a wind shielding device for an indirect air-cooled tower, solve the problems in the background, realize the calculation of the opening degree of the louvers of the wind shielding device for the indirect cooling tower, reduce the influence of vortex, and improve the efficiency of the air-cooling system.

[0005] To solve the problems in the above-mentioned background art, the technical solution of the present invention is as follows.

[0006] A calculation method for regulating the opening degree of louvers of a wind shielding device for an indirect air-cooled tower, characterized by including the following steps: S1: Obtain environmental meteorological data, wind speed and wind direction data of the louvers of the wind shielding device, wall temperature data of the cooling triangles, wind speed and wind direction data entering the tower, and the opening degree of the louvers of the wind shielding device; S2: Based on the monitored data of the environmental temperature and environmental wind speed, if the environmental temperature is greater than x and the environmental wind speed is between y and z, enter the next step S3, otherwise, open all the louvers of the overall wind shielding device; S3: Based on the wind speed monitoring data of the louver of the windshield device, if the wind speed of the louver of the i-th windshield device is less than z, proceed to the next step S4; otherwise, fully open the louver of the i-th windshield device. S4: Based on the environmental wind direction and the position of the louver of the i-th windshield device, determine whether the louver of the i-th windshield device is on the side wind side or the leeward side. S5: If the louver of the i-th windshield device is on the side wind side, then determine whether it is the front side wind or the back side wind according to the wind direction and position of the louver of the i-th windshield device; then, according to the wind speed of the louver of the i-th windshield device, determine the minimum limit value ka and the maximum limit value kb of the adjustment opening of the louver of the i-th windshield device, and calculate the average wind speed Fia and the average wall temperature Tia of the two adjacent fan segments at the front end of the louver of the i-th windshield device and the average wind speed Fib and the average wall temperature Tib of the two adjacent fan segments at the back end. S6: If the louver of the i-th windshield device is the front side wind, then judge the numerical relationship between Tia and Tib, and between Fia and Fib; if Tia is less than Tib and Fia is greater than Fib, then close the adjustment opening kdi of the louver of the i-th windshield device by step; otherwise, open kdi by step, and limit the value of kdi to be between ka and kb. S7: If the louver of the i-th windshield device is the back side wind, then judge the numerical relationship between Tia and Tib, and between Fia and Fib; if Tia is greater than Tib and Fia is less than Fib, then close kdi by step; otherwise, open kdi by step, and limit the value of kdi to be between ka and kb. S8: If the louver of the i-th windshield device is on the leeward side, set the minimum limit value kc and the maximum limit value kd of the adjustment opening of the louver of the i-th windshield device, and calculate the absolute value of the difference in the incoming tower wind direction between the adjacent fan segments before and after the position of the louver of the i-th windshield device; if the absolute value is greater than k, then open kdi by step; otherwise, close kdi by step, and limit the value of kdi to be between kc and kd. S9: Output the adjustment opening of the louver of the i-th windshield device, and return to step S3 to calculate the adjustment opening of the louver of the (i + 1)-th windshield device until the calculation of the adjustment opening of the louvers of the overall windshield device is completed.

[0007] The louver of the windshield device adopts a combined control method to realize the real-time control of the louvers of each windshield device under different working conditions.

[0008] The calculation of the adjustment opening of the louver of the windshield device realizes the balance of the air intake of the front and rear fan segments of the louver of the windshield device by comprehensively considering the average wind speed Fia and the average wall temperature Tia of the two adjacent fan segments at the front end of the louver of the windshield device and the average wind speed Fib and the average wall temperature Tib of the two adjacent fan segments at the back end, and the incoming tower wind direction of the adjacent fan areas before and after the position of the louver of the windshield device, reduces the influence of eddy currents, and thus improves the efficiency of the air-cooling system.

[0009] The values of x, y, z, k, ka, kb, kc, kd, and step can be set manually according to actual requirements. Among them, kd can be set up to 80% at most to ensure that when the porosity before and after is too large, the control self-circulation under high wind speed is reduced.

[0010] The beneficial effects of the present invention are as follows: Based on environmental meteorological data, wind speed and direction data of the windshield device louvers, cooling triangle wall temperature data, inlet tower wind speed and direction data, and the opening degree of the windshield device louvers, this calculation method adopts a combined control method to calculate and regulate the windshield device louvers, so that the fan segments near the windshield device louvers achieve an air intake balance, thereby improving the efficiency of the air-cooled system and providing a theoretical basis for the implementation of actual projects. Description of the Drawings

[0011] Figure 1 It is a logic flowchart of a calculation method for regulating the opening degree of the windshields of an indirect air-cooled tower. Detailed Embodiments

[0012] To make the technical means, creative features, achieved purposes, and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0013] To make the purposes, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0015] Embodiment: Application of a calculation method for regulating the opening degree of the windshields of an indirect air-cooled tower in an indirect air-cooled tower.

[0016] A calculation method for regulating the opening degree of the windshields of an indirect air-cooled tower, characterized by including the following steps: S1: Obtain environmental meteorological data, wind speed and direction data of the windshields, cooling triangle wall temperature data, inlet tower wind speed and direction data, and the opening degree of the windshields. S2: The ambient temperature is 26.7 °C, the ambient wind speed is 5.16 m / s, the ambient temperature is greater than x = 26 °C and the ambient wind speed is between y = 4 m / s and z = 12 m / s, proceed to the next step S3; S3: The wind speed of the louver of the No. 1 wind deflector is 3.51 m / s, which is less than z = 12 m / s, proceed to the next step S4; S4: The ambient wind direction is 115.13°. Based on the ambient wind direction and the position of the louver of the No. 1 wind deflector, it is determined that the louver of the No. 1 wind deflector is on the side of the crosswind; S5: The wind direction of the louver of the No. 1 wind deflector is 157.46° and the wind speed is 3.51 m / s. According to the wind direction and position of the louver of the No. 1 wind deflector, it is determined that it is the backside crosswind; then, according to the wind speed of the louver of the No. 1 wind deflector, the minimum limit ka = 80% and the maximum limit kb = 100% of the control opening of the louver of the No. 1 wind deflector are determined, and the average wind speed Fia = 3.23 m / s and the average wall temperature Tia = 28.2 °C of the two adjacent fan segments at the front end of the louver of the No. 1 wind deflector and the average wind speed Fib = 4.38 m / s and the average wall temperature Tib = 26.5 °C of the two adjacent fan segments at the rear end are calculated; S6: The louver of the No. 1 wind deflector is the backside crosswind. Judge the numerical relationship between Tia and Tib, and Fia and Fib; Tia = 28.2 °C is greater than Tib = 26.5 °C and Fia = 3.23 m / s is less than Fib = 4.38 m / s. The control opening kdi of the louver of the No. 1 wind deflector is closed by step = 5% to 100%; S7: Output the control opening of 95% of the louver of the No. 1 wind deflector, and return to step S3 to calculate the control opening of the louver of the No. 2 wind deflector until the calculation of the control opening of the louver of the overall wind deflector is completed.

[0017] Through the application of the present invention, it is possible to calculate the control opening of the louver of the wind deflector according to the working conditions, so as to adjust the louver of the wind deflector in real time and improve the efficiency of the air-cooling system.

[0018] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claimed rights.

[0019] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A calculation method for regulating the opening degree of the louvers of the wind deflector device of an indirect air cooling tower, characterized in that It includes the following steps: S1: Obtain environmental meteorological data, wind speed and direction data of the louvers of the windshield device, wall temperature data of the cooling triangle, wind speed and direction data entering the tower, and the opening degree of the louvers of the windshield device; S2: Based on the monitored data of environmental temperature and environmental wind speed, if the environmental temperature is greater than x and the environmental wind speed is between y and z, proceed to the next step S3; otherwise, fully open the louvers of the overall windshield device; S3: Based on the monitored wind speed data of the louvers of the windshield device, if the wind speed of the louvers of the i-th windshield device is less than z, proceed to the next step S4; otherwise, fully open the louvers of the i-th windshield device; S4: Based on the environmental wind direction and the position of the louvers of the i-th windshield device, determine whether the louvers of the i-th windshield device are on the leeward side or the windward side; S5: If the louvers of the i-th windshield device are on the windward side, then determine whether it is the front windward or the back windward according to the wind direction and position of the louvers of the i-th windshield device; then, according to the wind speed of the louvers of the i-th windshield device, determine the minimum limit value ka and the maximum limit value kb of the regulation opening degree of the louvers of the i-th windshield device, and calculate the average wind speed Fia and the average wall temperature Tia of the two adjacent fan segments at the front end of the louvers of the i-th windshield device and the average wind speed Fib and the average wall temperature Tib of the two adjacent fan segments at the back end; S6: If the louvers of the i-th windshield device are the front windward, then judge the numerical relationship between Tia and Tib, and between Fia and Fib; If Tia is less than Tib and Fia is greater than Fib, then close the regulation opening degree kdi of the louvers of the i-th windshield device by step; otherwise, open kdi by step, and limit the value of kdi to be between ka and kb; S7: If the louvers of the i-th windshield device are the back windward, then judge the numerical relationship between Tia and Tib, and between Fia and Fib; if Tia is greater than Tib and Fia is less than Fib, then close kdi by step; otherwise, open kdi by step, and limit the value of kdi to be between ka and kb; S8: If the louvers of the i-th windshield device are on the leeward side, set the minimum limit value kc and the maximum limit value kd of the regulation opening degree of the louvers of the i-th windshield device, and calculate the absolute value of the difference in the wind direction entering the tower between the adjacent fan segments before and after the position of the louvers of the i-th windshield device; if the absolute value is greater than k, then open kdi by step; otherwise, close kdi by step, and limit the value of kdi to be between kc and kd; S9: Output the regulation opening degree of the louvers of the i-th windshield device, and return to step S3 to calculate the regulation opening degree of the louvers of the (i + 1)-th windshield device until the calculation of the regulation opening degree of the louvers of the overall windshield device is completed.

2. The calculation method for regulating the opening degree of the louvers of the wind shield device of an indirect air cooling tower according to claim 1, wherein: The louvers of the windshield device adopt a combined regulation method to realize the real-time regulation of the louvers of each windshield device under different working conditions.

3. The calculation method for regulating the opening degree of the louvers of the wind blocking device of an indirect air cooling tower according to claim 1, characterized in that: The calculation of the regulation opening degree of the louvers of the windshield device realizes the balance of the air intake volume of the front and rear fan segments of the louvers of the windshield device by comprehensively considering the average wind speed Fia and the average wall temperature Tia of the two adjacent fan segments at the front end of the louvers of the windshield device and the average wind speed Fib and the average wall temperature Tib of the two adjacent fan segments at the back end, and the wind direction entering the tower of the adjacent fan areas before and after the position of the louvers of the windshield device, reduces the influence of eddy currents, and thus improves the efficiency of the air-cooling system.

4. A calculation method for adjusting the opening degree of the louver of the wind shielding device of an indirect air cooling tower according to claim 1, characterized in that: The values of x, y, z, k, ka, kb, kc, kd, and step can be set manually according to actual requirements. Among them, the maximum value of kd can be set to 80%, ensuring that when the porosity is too large before and after, the control self-circulation under high wind speed is reduced.

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