Calculation method for local regulation and control opening degree of blind window of indirect air cooling tower

Abstract

The invention provides a method for calculating the local regulation and control opening degree of a shutter of an indirect air cooling tower, and the calculation of the local regulation and control opening degree of the shutter of the indirect air cooling tower comprises the steps: comprehensively considering cooling column wall temperature data, shutter opening degree feedback data, sector return water temperature data, environment temperature data, environment wind direction data and tower inlet wind speed data; and calculating the opening degree of the shutter. Wherein the wall temperature data is used as a main calculation basis, and the opening degree of the louver is calculated; the sector return water temperature also serves as a main calculation basis, the opening degree of the louver is limited, and once the situation that the sector return water temperature is too low occurs, the opening degree needs to be adjusted in time to avoid freezing. By adjusting the opening degree of the shutter, the tube bundle breaking frequency is reduced, and manpower and material resource losses are reduced.

Description

Technical Field

[0001] The present invention is a calculation method for locally regulating the opening degree of the louver of an indirect air cooling tower, belonging to the technical field of cooling towers. Background Technique

[0002] The main power in China comes from thermal power generation. The circulating water system is essential in thermal power generation. The circulating water takes the heat of the equipment to the cooling tower, and the cooling tower discharges the heat into the air through evaporation and contact. The indirect cooling tower mainly dissipates heat through the heat dissipation tube bundle in contact with the outside air. When the outside temperature is relatively low, many enterprises will close the louvers of the indirect cooling tower to prevent the tube bundle from freezing. However, closing the louvers will cause poor ventilation, resulting in the heat dissipation performance not meeting the requirements and the low cooling performance of the cooling tower.

[0003] The indirect cooling tower cools the water through the indirect contact between air and water, thereby reducing the temperature of the circulating water and enabling the cooling water to be recycled. When the existing indirect cooling tower is used in winter, attention needs to be paid to the problem of icing in winter. In the early winter, the temperature difference between day and night is relatively large. During the day, it is not cold enough, and the indirect cooling tower needs to exchange heat with the outside world. The louvers of the indirect cooling tower need to be opened during the day. At night, the temperature is relatively low, and icing is likely to occur. In the deep winter, the external environment is cold enough. If the louvers of the indirect cooling tower are not completely closed, the windward pipeline is extremely easy to freeze and crack, resulting in the paralysis of the corresponding fan section of the indirect cooling tower. At present, the regulation of the opening degree of the louvers of the indirect cooling tower is mostly based on empirical values, lacking a calculation method for locally regulating the opening degree of the cooling triangular louvers according to different working conditions. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a calculation method for locally regulating the opening degree of the louver of an indirect air cooling tower to solve the problems in the above background, and to avoid the rupture of the winter pipeline of the indirect cooling tower and improve the heat exchange efficiency of the indirect cooling tower.

[0005] In order to achieve the above purpose, the present invention is realized through the following technical solutions: A calculation method for locally regulating the opening degree of the louver of an indirect air cooling tower, characterized in that: the local opening degree of the louver is calculated by comprehensively considering influencing factors such as environmental parameters, wall temperature parameters, and unit parameters, including the following steps: S1: Collect data: cooling column wall temperature data, louver opening degree feedback data, fan section return water temperature data, environmental temperature data, environmental wind direction data, inlet tower wind speed data, the number of fan sections n, etc.; S2: According to the cooling column wall temperature data, the fan section is evenly divided into two parts, and each part is used as a local opening degree regulation unit of the louver to participate in the control of the louver opening degree. The lowest wall temperature value Tij in the local opening degree regulation unit of the louver is screened and obtained (i is the fan section number, j = 1 is the front part number of the fan section, j = 2 is the rear part number of the fan section); S3: According to the fan section return water temperature data, determine the return water temperature Twbi of each fan section; S4: Determine the starting value tx of the anti-freezing temperature control according to the ambient temperature Ta; S5: Determine the additional value tyi of the anti-freezing temperature control for the air intake fan section and each fan section according to the ambient wind direction Fx; S6: Determine the additional value tfij of the anti-freezing temperature control according to the wind speed Fsij entering the tower; S7: Assume the initial values: i = 1, j = 1; S8: Iteratively judge in the order of the fan sections whether Tij > tx + tyi + tfij and Twbi > Ea are satisfied, where Ea is the set low limit value of the return water temperature. If so, open the louver by step. Otherwise, close the louver by step. The louver opening range is 0 - 100%; S9: Output the louver opening;

[0006] The local louver opening regulation unit is the smallest unit for controlling the louver opening. By calculating the lowest wall temperature value, the starting value of the anti-freezing temperature control, and the additional value of the anti-freezing temperature control of the local louver opening regulation unit, the calculation and regulation of the louver opening in units of half fan sections are realized, avoiding the difference in the air intake volume caused by the different louver opening degrees at different positions of the cooling tower in the tube bundle, thereby preventing the local temperature of the cooling triangle from being too low and the tube bundle from cracking due to freezing.

[0007] The return water temperature of the fan section is used to predict the cooling effect of the circulating water in advance and adjust the louver opening in time when the circulating water enters the cooling column for cooling, improving the anti-freezing effect.

[0008] The starting value of the anti-freezing temperature control and the additional value of the anti-freezing temperature control are margins affected by environmental factors. When the lowest wall temperature value is greater than the margin, the ice formation risk of the fan section is reduced. When the lowest wall temperature value is lower than the margin, the ice formation risk of the fan section increases.

[0009] The step is the action amplitude of the louver, and its value can be set manually according to actual needs to facilitate the louver action and achieve winter anti-freezing.

[0010] The beneficial effects of the present invention: This calculation method calculates the louver opening based on the cooling column wall temperature data, louver opening feedback data, fan section return water temperature data, ambient temperature data, ambient wind direction data, and wind speed data entering the tower; according to the relationship between the lowest wall temperature value and the starting value of the anti-freezing temperature control and the additional value of the anti-freezing temperature control, the louver is regulated in zones. By adjusting the louver opening, the frequency of tube bundle rupture is reduced, and the loss of manpower and material resources is reduced. Description of the Drawings

[0011] Figure 1 It is a logic flow chart of a calculation method for locally regulating the opening of the louver of an indirect air-cooled tower. Detailed Embodiment

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

[0013] Please refer to Figure 1 , the present invention provides a technical solution: a calculation method for locally regulating the opening degree of the louver of an indirect air cooling tower, characterized in that: the local opening degree of the louver is calculated by comprehensively considering influencing factors such as environmental parameters, wall temperature parameters, and unit parameters, including the following steps: S1: Collect data: cooling column wall temperature data, louver opening feedback data, fan section return water temperature data, ambient temperature data, ambient wind direction data, inlet tower wind speed data, number of fan sections n, etc.; S2: According to the cooling column wall temperature data, the fan section is evenly divided into two parts, and each part is used as a local opening degree regulation unit of the louver to participate in the louver opening control, and the lowest wall temperature value Tij in the local opening degree regulation unit of the louver is screened and obtained (i is the fan section number, j = 1 is the front part number of the fan section, j = 2 is the rear part number of the fan section); S3: According to the fan section return water temperature data, determine the return water temperature Twbi of each fan section; S4: According to the ambient temperature Ta, determine the starting value tx of the antifreeze temperature control; S5: According to the ambient wind direction Fx, determine the windward fan section and the additional antifreeze temperature control value tyi of each fan section; S6: According to the inlet tower wind speed Fsij, determine the additional antifreeze temperature control value tfij; S7: Assume the initial value: i = 1, j = 1; S8: Iteratively judge in the order of the fan section whether Tij>tx + tyi + tfij and Twbi>Ea are satisfied, where Ea is the set low limit value of the return water temperature. If so, the louver opening is increased by step, otherwise, the louver opening is decreased by step. The louver opening range is 0~100%; S9: Output the louver opening;

[0014] Example 1: S1: Collect data: cooling column wall temperature data, louver opening feedback data, fan section return water temperature data, ambient temperature data, ambient wind direction data, inlet tower wind speed data, number of fan sections n, etc.; S2: According to the cooling column wall temperature data, the fan section is evenly divided into two parts, and each part is used as a local opening degree regulation unit of the louver to participate in the louver opening control, and the lowest wall temperature value Tij in the local opening degree regulation unit of the louver is screened and obtained (i is the fan section number, j = 1 is the front part number of the fan section, j = 2 is the rear part number of the fan section); 1# Sector Segment T11 1# Sector Segment T12 2# Sector Segment T21 2# Sector Segment T22 3# Sector Segment T31 3# Sector Segment T32 14.78 13.21 8.37 9.53 9.54 10.30 4# Sector Segment T41 4# Sector Segment T42 5# Sector Segment T51 5# Sector Segment T52 6# Sector Segment T61 6# Sector Segment T62 11.26 12.23 13.15 11.33 11.27 14.38 7# Sector Segment T71 7# Sector Segment T72 8# Sector Segment T81 8# Sector Segment T82 9# Sector Segment T91 9# Sector Segment T92 14.21 13.58 15.26 12.71 11.24 14.27 10# Sector Segment T101 10# Sector Segment T102 11# Sector Segment T111 11# Sector Segment T112 12# Sector Segment T121 12# Sector Segment T122 15.21 12.55 11.97 12.54 13.44 11.47 S3: Determine the return water temperature Twbi of each fan section according to the return water temperature data of the fan section; 1# Sector Segment Twb1 2# Sector Segment Twb2 3# Sector Segment Twb3 4# Sector Segment Twb4 5# Sector Segment Twb5 6# Sector Segment Twb6 15.76 13.44 10.48 10.54 10.69 11.35 7# Sector Segment Twb7 8# Sector Segment Twb8 9# Sector Segment Twb9 10# Sector Segment Twb10 11# Sector Segment Twb11 12# Sector Segment Twb12 11.63 13.59 13.47 11.36 12.01 12.59 S4: Determine the starting value tx = 2°C of the antifreeze temperature control according to the ambient temperature Ta = -10°C; S5: Determine that the 3# fan section is the windward fan section and the additional value tyi of the antifreeze temperature control for each fan section according to the ambient wind direction Fx = 87.6°; 1# Sector Segment ty1 2# Sector Segment ty2 3# Sector Segment ty3 4# Sector Segment ty4 5# Sector Segment ty5 6# Sector Segment ty6 0 0 1 0 0 0 7# Sector Segment ty7 8# Sector Segment ty8 9# Sector Segment ty9 10# Sector Segment ty10 11# Sector Segment ty11 12# Sector Segment ty12 0 0 0 0 0 0 S6: Determine the additional value tfij of the antifreeze temperature control according to the inlet tower wind speed Fsij; 1# Sector Segment Fs11 1# Sector Segment Fs12 2# Sector Segment Fs21 2# Sector Segment Fs22 3# Sector Segment Fs31 3# Sector Segment Fs32 2.1 1.7 2.3 1.5 2.4 2.8 4# Sector Segment Fs41 4# Sector Segment Fs42 5# Sector Segment Fs51 5# Sector Segment Fs52 6# Sector Segment Fs61 6# Sector Segment Fs62 2.2 2.0 1.9 1.8 1.7 2.1 7# Sector Segment tFs71 7# Sector Segment Fs72 8# Sector Segment Fs81 8# Sector Segment Fs82 9# Sector Segment Fs91 9# Sector Segment Fs92 2.1 2.3 1.6 1.9 1.8 1.7 10# Sector Segment Fs101 10# Sector Segment Fs102 11# Sector Segment Fs111 11# Sector Segment Fs112 12# Sector Segment Fs121 12# Sector Segment Fs122 2.0 1.9 2.6 2.8 3.0 2.7 1# Sector Segment tf11 1# Sector Segment tf12 2# Sector Segment tf21 2# Sector Segment tf22 3# Sector Segment tf31 3# Sector Segment tf32 1 0 1 0 1 1 4# Sector Segment tf41 4# Sector Segment tf42 5# Sector Segment tf51 5# Sector Segment tf52 6# Sector Segment tf61 6# Sector Segment tf62 1 1 0 0 0 1 7# Sector Segment tf71 7# Sector Segment tf72 8# Sector Segment tf81 8# Sector Segment tf82 9# Sector Segment tf91 9# Sector Segment tf92 1 1 0 0 0 0 10# Sector Segment tf101 10# Sector Segment tf102 11# Sector Segment tf111 11# Sector Segment tf112 12# Sector Segment tf121 12# Sector Segment tf122 1 0 1 1 1 1 S7: Assume the initial values: i = 1, j = 1; S8: Iteratively judge in the order of the fan sections whether Tij > t1 + tyi + tfij and Twbi > Ea are satisfied, where Ea is the set low limit value of the return water temperature. If so, increase the louver opening Kdij by 10%. Otherwise, decrease the louver opening Kdij by 10%. The range of the louver opening is 0 - 100%; 1# Sector Segment Kd11 1# Sector Segment Kd12 2# Sector Segment Kd21 2# Sector Segment Kd22 3# Sector Segment Kd31 3# Sector Segment Kd32 Open 10% Wider Open 10% Wider Open 10% Wider Open 10% Wider Open 10% Wider Open 10% Wider 4# Sector Segment Kd41 4# Sector Segment Kd42 5# Sector Segment Kd51 5# Sector Segment Kd52 6# Sector Segment Kd61 6# Sector Segment Kd62 Open 10% Wider Open 10% Wider Open 10% Wider Open 10% Wider Open 10% Wider Open 10% Wider 7# Sector Segment Kd71 7# Sector Segment Kd72 8# Sector Segment Kd81 8# Sector Segment Kd82 9# Sector Segment Kd91 9# Sector Segment Kd92 Open 10% Wider Open 10% Wider Increase by 10% Increase by 10% Increase by 10% Increase by 10% Sector 10, Kd101 Sector 10, Kd102 Sector 11, Kd111 Sector 11, Kd112 Sector 12, Kd121 Sector 12, Kd122 Increase by 10% Increase by 10% Increase by 10% Increase by 10% Increase by 10% Increase by 10% S9: Output the louver opening.

[0015] The above shows and describes the basic principle, 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 - restrictive. 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 claims involved.

[0016] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way 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 locally regulating the opening degree of the louver of an indirect air cooling tower, characterized in that: Calculate the local opening of the louver considering influencing factors such as comprehensive environmental parameters, wall temperature parameters, and unit parameters, including the following steps: S1: Collect data: cooling column wall temperature data, louver opening feedback data, return water temperature data of each fan section, ambient temperature data, ambient wind direction data, inlet tower wind speed data, number of fan sections n, etc.; S2: According to the cooling column wall temperature data, evenly divide the fan section into two parts, and use each part as a local louver opening control unit to participate in the louver opening control. Screen and obtain the lowest wall temperature value Tij in the local louver opening control unit (i is the fan section number, j = 1 is the front part number of the fan section, j = 2 is the rear part number of the fan section); S3: Determine the return water temperature Twbi of each fan section according to the return water temperature data of the fan section; S4: Determine the starting value tx of the anti-freezing temperature control according to the ambient temperature Ta; S5: Determine the windward fan section and the additional value tyi of the anti-freezing temperature control for each fan section according to the ambient wind direction Fx; S6: Determine the additional value tfij of the anti-freezing temperature control according to the inlet tower wind speed Fsij; S7: Assume the initial values: i = 1, j = 1; S8: Iteratively judge in the order of fan sections whether Tij>tx + tyi + tfij and Twbi>Ea are satisfied, where Ea is the set low limit value of the return water temperature. If so, open the louver by step, otherwise, close the louver by step. The louver opening range is 0~100%; S9: Output the louver opening.

2. The calculation method for locally regulating the opening degree of the louver of an indirect air-cooled tower according to claim 1, characterized in that: The local louver opening control unit is the smallest unit for louver opening control. By calculating the lowest wall temperature value, the starting value of the anti-freezing temperature control, and the additional value of the anti-freezing temperature control of the local louver opening control unit, the louver opening calculation and regulation are realized in units of half a fan section, avoiding the situation that the air intake volume difference caused by the different louver openings at different positions of the cooling tower leads to too low local temperature of the cooling triangle and the freezing of the tube bundle.

3. The calculation method for locally regulating the opening degree of the louver of an indirect air-cooling tower according to claim 1, characterized in that: The return water temperature of the fan section is used to predict the cooling effect of the circulating water in advance and timely adjust the louver opening when the circulating water enters the cooling column for cooling, improving the anti-freezing effect.

4. The calculation method for locally regulating the opening degree of the louvers of an indirect air-cooling tower according to claim 1, wherein: The starting value of the anti-freezing temperature control and the additional value of the anti-freezing temperature control are margins affected by environmental factors. When the lowest wall temperature value is greater than the margin, the ice formation risk of the fan section decreases, and when the lowest wall temperature value is lower than the margin, the ice formation risk of the fan section increases.

5. A calculation method for locally regulating the opening degree of the louver of an indirect air-cooled tower according to claim 1, characterized in that: The step is the action amplitude of the louver, and its value can be set manually according to actual needs to facilitate the louver action and achieve winter anti-freezing.

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