Cooling tower water distribution method and system

Abstract

The present invention relates to a cooling tower water distribution method and system, comprising: cooling zone setting, comprising setting a plurality of cooling zones along the radial direction of the cooling tower, with the cooling zone farthest from the center of the cooling tower being a strong cooling zone; real-time monitoring of the coolant temperature, comprising monitoring the coolant temperature at the bottom of the cooling zone; and water distribution device adjustment, comprising a low-temperature antifreeze adjustment step or a normal-temperature efficiency-enhancing adjustment step. This scheme judges the cooling capacity of different cooling zones of the cooling tower according to the coolant temperature, and performs quantitative water supply according to the cooling capacity of different cooling zones, thereby achieving the advantages of improving the heat exchange effect of the cooling tower when the ambient temperature is high, and avoiding icing of the cooling tower when the ambient temperature is low.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling tower performance optimization, and in particular to a cooling tower water distribution method and system. Background Art

[0002] Natural ventilation countercurrent wet cooling tower is a cold end equipment commonly used in thermal power plants and nuclear power plants. It mainly exchanges heat and mass through direct contact between coolant and air to achieve the purpose of reducing the temperature of circulating cooling water.

[0003] From the cooling characteristics of the cooling tower, it can be seen that cold air enters the rain area through the air inlet of the cooling tower. The air flow in the outer area is large, the temperature and humidity are low, and the heat exchange effect is good; a small part of the air flow overcomes the water resistance and enters the central area of the cooling tower, and transfers heat and mass with the sprayed coolant in the radial stroke, that is, with the central shaft of the cooling tower as the center and pointing to the outer wall of the tower, the wind speed and air volume of the cold air show a distribution characteristic of gradually increasing from small to large, and the cooling capacity shows a distribution characteristic of increasing from weak to strong, while the cooling capacity of areas close to the center is similar. The existing water distribution device and water distribution method cannot quantitatively distribute water according to the differences in the radial heat exchange performance of the cooling tower.

[0004] In addition, in cold seasons (when the ambient temperature is low), the temperature of the cooling tower is low away from the center, and the coolant is prone to ice at the upper edge of the cooling tower's air inlet, the edge filler position, the nozzle of the water distribution device away from the center of the cooling tower, etc., which can easily lead to deterioration of the heat exchange conditions in the tower and damage to the filler layer. The existing water distribution device and water distribution method are unable to dynamically adapt to climate changes to achieve the purpose of preventing freezing. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a cooling tower water distribution method and system.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A cooling tower water distribution method, comprising:

[0008] The cooling zone setting includes setting a plurality of cooling zones along the radial direction of the cooling tower, and the cooling zone farthest from the center of the cooling tower is a strong cooling zone;

[0009] Real-time monitoring of the coolant temperature, including monitoring the coolant temperature at the bottom of the different cooling zones;

[0010] Water distribution device adjustment, including low temperature antifreeze adjustment steps or normal temperature efficiency adjustment steps;

[0011] The low-temperature antifreeze adjustment step includes: when it is detected that the coolant temperature corresponding to the strong cooling zone is lower than the coolant freezing point threshold, adjusting the water distribution device to increase the water distribution amount to the strong cooling zone and / or adjusting the nozzle of the water distribution device to face the strong cooling zone;

[0012] The normal temperature efficiency enhancement step includes: when it is monitored that the coolant temperature corresponding to the strong cooling zone is not less than the coolant freezing point threshold, comparing the cooling capacities corresponding to different cooling zones according to the coolant temperature, and adjusting the water distribution amount of different cooling zones using the water distribution device according to the cooling capacity.

[0013] Preferably, the low temperature antifreeze adjustment step includes:

[0014] Presetting the freezing point threshold of the coolant;

[0015] Determining whether the coolant temperature at the bottom of the strong cooling zone is less than the coolant freezing point threshold;

[0016] When the coolant temperature is lower than the coolant freezing point threshold, adjusting the water distribution device to increase the water distribution amount to the strong cooling zone;

[0017] determining again whether the coolant temperature at the bottom of the strong cooling zone is less than the coolant freezing point threshold;

[0018] When the coolant temperature is still lower than the coolant freezing point threshold, the nozzle of the water distribution device is adjusted to face the strong cooling zone.

[0019] Preferably, the step of adjusting the nozzle of the water distribution device toward the strong cooling zone includes:

[0020] Direct the nozzles of the nozzles corresponding to the strong cooling zone toward the strong cooling zone, and direct the nozzles of the nozzles corresponding to the remaining cooling zones toward the top of the cooling tower;

[0021] or,

[0022] All nozzles are directed toward the intense cooling zone.

[0023] Preferably, the room temperature synergistic adjustment step includes:

[0024] Preset coolant freezing point threshold;

[0025] Determining whether the coolant temperature at the bottom of the strong cooling zone is not less than the coolant freezing point threshold;

[0026] When the coolant temperature is not less than the coolant freezing point threshold, obtaining the coolant temperatures corresponding to the different cooling zones in real time;

[0027] comparing the cooling capacities of the different cooling zones according to the coolant temperature to obtain a comparison result;

[0028] According to the comparison result, the water distribution device is used to adjust the water distribution amount of different cooling zones;

[0029] The normal temperature synergistic adjustment step further includes:

[0030] All nozzles of the water distribution device are directed toward the top of the cooling tower.

[0031] Preferably, the water distribution device adjustment also includes water distribution device adaptation installation, which specifically includes:

[0032] A water distribution pipe is installed above the cooling zone in a one-to-one correspondence, and a plurality of water distribution pipes are arranged from the center of the cooling tower to the edge of the cooling tower, with the pipe diameter increasing in sequence;

[0033] A regulating valve is installed at the water inlet end of each water distribution pipe;

[0034] A plurality of nozzles are installed on each of the water distribution pipes, and the number of the nozzles is proportional to the cross-sectional area of the corresponding water distribution pipe;

[0035] The step of adjusting the water distribution amount of different cooling zones by using the water distribution device according to the cooling capacity includes:

[0036] Keep the valve opening of the regulating valve corresponding to the water distribution pipe farthest from the center of the cooling tower at the maximum, and adjust the valve opening of the corresponding regulating valve according to the ratio of the coolant temperatures corresponding to different cooling zones based on the valve opening of the regulating valve with the largest opening as a reference.

[0037] A cooling tower water distribution system, which uses the above method to distribute water, comprises:

[0038] A cooling zone, used to cool the coolant, wherein the cooling zone farthest from the center of the cooling tower is a strong cooling zone;

[0039] a water distribution device for supplying coolant to the cooling zone;

[0040] A coolant temperature real-time monitoring module, used to monitor the coolant temperature passing through all the cooling zones;

[0041] The water distribution device regulating module is used to regulate the water distribution amount of the water distribution device to different cooling zones and / or regulate the water spraying direction of the water distribution device according to the coolant temperature.

[0042] Preferably, the water distribution device comprises: a central shaft, a water distribution pipeline, and a water spray pipeline;

[0043] The water spray pipeline is connected to the central shaft through the water distribution pipeline;

[0044] The water spray pipeline includes a water distribution pipe, and a plurality of the water distribution pipes are arranged at equal distances along the radial direction of the central shaft, and the diameters of the plurality of water distribution pipes distributed from the center of the central shaft to the edge of the cooling tower gradually increase;

[0045] Each of the water distribution pipes is connected to a plurality of nozzles, and at least the nozzle connected to the water distribution pipe with the largest diameter is configured as a rotatable nozzle;

[0046] The number of the nozzles connected to the water distribution pipe is proportional to the cross-sectional area of the water distribution pipe;

[0047] The water distribution pipeline includes several regulating valves that control the amount of water distributed from the central shaft to different water distribution pipes;

[0048] The rotatable spray head and the regulating valve are both electrically connected to the water distribution device regulating module.

[0049] Preferably, the water distribution pipe is configured as an annular water distribution pipe;

[0050] The water distribution pipeline includes a plurality of water supply pipes arranged in a one-to-one correspondence with the annular water distribution pipes, the water supply pipes are connected to the central vertical shaft and the corresponding annular water distribution pipes, and each of the water supply pipes is installed with a regulating valve;

[0051] The diameter of the water supply pipe is equal to the diameter of the annular water distribution pipe connected thereto, and the sum of the cross-sectional areas of all the water supply pipes is equal to the cross-sectional area of the central vertical shaft.

[0052] Preferably, the water distribution pipeline includes a plurality of first water distribution pipes distributed in a circular array around the central vertical shaft, and one end of the first water distribution pipe is connected to the central vertical shaft;

[0053] The water distribution pipe is configured as an arc-shaped water distribution pipe, and a plurality of the arc-shaped water distribution pipes are provided along the central axis of the first water distribution pipe;

[0054] Each of the first water distribution pipes is connected to an arc-shaped water distribution pipe arranged along the central axis thereof through a second water distribution pipe, and the second water distribution pipes are arranged in a one-to-one correspondence with the arc-shaped water distribution pipes;

[0055] The diameter of the second water distribution pipe is equal to the diameter of the arc-shaped water distribution pipe connected thereto, and the sum of the cross-sectional areas of all the second water distribution pipes is equal to the cross-sectional area of the first water distribution pipe, and the sum of the cross-sectional areas of all the first water distribution pipes is equal to the cross-sectional area of the central vertical shaft;

[0056] One regulating valve is installed on each of the second water distribution pipes.

[0057] Preferably, it also includes a packing layer, a temperature detection device, a water collection tank, and a processing center.

[0058] The cooling zone is arranged on the packing layer, and the temperature detection device is arranged at the bottom of the packing layer;

[0059] The temperature detection device is electrically connected to the coolant temperature real-time monitoring module;

[0060] The processing center is electrically connected to the coolant temperature real-time monitoring module and the water distribution device regulating module.

[0061] Compared with the prior art, the present invention has the following beneficial effects:

[0062] The above technical solution provides a cooling tower water distribution method. According to the characteristic that the cooling capacity of the cooling tower gradually decreases from the edge to the center, a number of cooling zones are set radially from the cooling tower, and the coolant temperature of each cooling zone is monitored in real time. Therefore, the cooling capacity of different cooling zones of the cooling tower can be judged according to the coolant temperature, and water is supplied quantitatively according to the cooling capacity of different cooling zones, thereby achieving the advantages of improving the heat exchange effect of the cooling tower when the ambient temperature is high and avoiding the freezing of the cooling tower when the ambient temperature is low. In addition, the quantitative water supply method includes adjusting the water distribution amount of different cooling zones, adjusting the spraying of the water distribution device, and adjusting the cooling capacity of the cooling tower. The separate application or combination of methods such as water direction means that when the ambient temperature is high, there is no need to consider the situation where the coolant temperature in the cooling zone farthest from the center of the cooling tower is too low and causes freezing, and the water distribution amount distributed to each cooling zone can be directly adjusted to make the heat exchange efficiency higher; when the ambient temperature is low, the coolant temperature in the cooling zone farthest from the center of the cooling tower is too low and it is easy to cause freezing. At this time, the monitored coolant temperature is too low, and the water distribution amount of the cooling zone farthest from the center of the cooling tower can be increased, and the water spray direction of the water distribution device can also be adjusted so that the water distribution direction is toward the corresponding cooling zone to avoid freezing.

[0063] The cooling tower water distribution system provided in the above technical solution can use the above method to adjust the water distribution volume to different cooling zones in real time according to changes in environmental conditions, thereby realizing quantitative water supply regulation. It can avoid low efficiency of the cooling tower when the ambient temperature is high, and avoid ice formation on the outside of the cooling tower when the ambient temperature is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0065] Figure 1 A schematic diagram of the steps of a cooling tower water distribution method provided by the present invention.

[0066] Figure 2 A schematic diagram of the steps of an embodiment of adjusting the water distribution device provided by the present invention.

[0067] Figure 3 This is a schematic diagram of the connections of various modules of a cooling tower water distribution system provided by the present invention.

[0068] Figure 4 This is a schematic diagram of the distribution of some structures in a cooling tower water distribution system provided by the present invention within the cooling tower.

[0069] Figure 5 This is a structural schematic diagram of an embodiment of the water distribution device provided by the present invention.

[0070] Figure 6 This is a structural schematic diagram of a second embodiment of the water distribution device provided by the present invention.

[0071] Figure 7 for Figure 6 Schematic diagram viewed from direction A.

[0072] Figure 8 for Figure 6 Schematic diagram of observation from direction B.

[0073] Figure 9 for Figure 6 Schematic diagram observed from direction C.

[0074] Description of reference numerals:

[0075] 1. Cooling zone; 2. Water distribution device; 21. Central shaft; 22. Water distribution pipeline; 220. Water supply pipe; 221. First water distribution pipe; 222. Second water distribution pipe; 23. Water spray pipeline; 231. Water distribution pipe; 2311. Annular water distribution pipe; 2312. Arc water distribution pipe; 232. Nozzle; 233. Control valve; 3. Coolant temperature real-time monitoring module; 4. Water distribution device control module; 5. Packing layer; 6. Temperature detection device; 7. Water collection tank; 8. Processing center; 81. Coolant freezing point threshold value preset unit; 82. Temperature judgment unit; 83. Cooling capacity comparison unit; 84. Control signal output unit. DETAILED DESCRIPTION

[0076] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0077] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0078] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0079] like Figures 1 to 4 As shown, an embodiment of the present invention provides a cooling tower water distribution method, comprising:

[0080] S1: Cooling zone 1 is set, including setting a plurality of cooling zones 1 along the radial direction of the cooling tower, and the cooling zone 1 farthest from the center of the cooling tower is a strong cooling zone;

[0081] S2: Real-time monitoring of coolant temperature, including monitoring the coolant temperature at the bottom of different cooling zones 1;

[0082] S3: Adjustment of the water distribution device 2, including a low-temperature antifreeze adjustment step or a normal-temperature efficiency-enhancing adjustment step.

[0083] Among them, the low-temperature antifreeze adjustment step is applicable when the ambient temperature is low. At this time, according to the characteristics of the cooling tower, the temperature at the outermost part of the cooling tower (i.e., the strong cooling zone near the edge of the cooling tower) is lower than that inside the cooling tower, and the coolant is more likely to freeze in the packing layer 5. The temperature of the strong cooling zone can be increased by adjusting the water distribution amount of the water distribution device 2 and the direction of the nozzle 232 of the water distribution device 2. The normal temperature efficiency adjustment step is applicable when the ambient temperature is high. At this time, the cooling tower will not freeze. When distributing water, it is only necessary to consider how to make the cooling tower heat exchange effect better, that is, according to the cooling capacity of different cooling zones 1, the water distribution amount of the water distribution device 2 to different cooling zones 1 can be reasonably allocated.

[0084] Low-temperature antifreeze adjustment can be implemented in a variety of ways. When it is monitored that the coolant temperature corresponding to the strong cooling area is lower than the coolant freezing point threshold, the water distribution device 2 can be adjusted to avoid freezing in the strong cooling area.

[0085] In one embodiment, the low temperature antifreeze adjustment step S3.1 includes:

[0086] S3.1.1: Preset coolant freezing point threshold;

[0087] S3.1.2: Determine whether the coolant temperature at the bottom of the strong cooling zone is less than the coolant freezing point threshold;

[0088] S3.1.3: When the coolant temperature is lower than the coolant freezing point threshold, adjust water distribution device 2 to increase the water distribution to the strong cooling zone;

[0089] S3.1.4: Determine again whether the coolant temperature at the bottom of the strong cooling zone is less than the coolant freezing point threshold;

[0090] S3.1.5: When the coolant temperature is still lower than the coolant freezing point threshold, adjust the nozzle 232 of the water distribution device 2 toward the strong cooling area.

[0091] In the above method, first, through steps S3.1.1 and S3.1.2, it is determined whether the temperature of the coolant at the bottom of the strong cooling zone reaches the freezing point threshold, and then it can be determined whether the coolant is easy to freeze. If it is easy to freeze, step S3.1.3 is executed, that is, when the coolant temperature is lower than the coolant freezing point threshold, the water supply to the strong cooling zone can be increased by regulating valve 233. On the one hand, the increase in water supply (that is, the flow rate of high-temperature coolant supplied to the strong cooling zone) can increase the temperature of the coolant after cooling; on the other hand, it can also increase the flow rate of the coolant, increase the impact force and friction of the water flow, and achieve the effect of preventing freezing. Afterwards, step S3.1.4 is executed again to determine whether the coolant temperature at the bottom of the strong cooling zone is lower than the coolant freezing point threshold; determine whether the effect of avoiding freezing can be achieved by adjusting the water supply. If the coolant temperature is still lower than the coolant freezing point threshold, it means that freezing cannot be avoided, and directly adjust The nozzle 232 of the water-saving distribution device 2 is directed toward the strong cooling zone. At this time, the coolant sprayed by the nozzle 232 can further increase the coolant flow rate under the action of gravity, increase the impact force and friction of the water flow, and because the spray height is reduced and the sprayed water flow is more concentrated, the contact area between the coolant and the cooling air is reduced, thereby preventing the coolant from freezing and causing the heat exchange conditions in the tower to deteriorate and the packing layer 5 to be damaged. If the coolant temperature is not less than the coolant freezing point threshold, it means that freezing can be avoided by adjusting the water distribution amount. At this time, the nozzle of the nozzle 232 is directed toward the top of the cooling liquid tower, and the sprayed coolant is directed toward the top of the tower, which can increase the spray height and diffusion area of the coolant, and thus help to increase the contact area between the coolant and the cold air, thereby reducing the temperature of the coolant. That is, in this operating state, only the flow rate of the coolant is regulated, which can prevent freezing while avoiding the reduction of the heat exchange efficiency of the cooling tower as much as possible.

[0092] In other embodiments, the low-temperature antifreeze adjustment step may be to adjust the water distribution device 2 to increase the water distribution amount to the strong cooling zone when it is monitored that the coolant temperature corresponding to the strong cooling zone is lower than the coolant freezing point threshold; or, when it is monitored that the coolant temperature corresponding to the strong cooling zone is lower than the coolant freezing point threshold, adjust the nozzle 232 of the water distribution device 2 toward the strong cooling zone, and only adjust the water distribution amount or the nozzle.

[0093] In one embodiment, when the coolant temperature is lower than the coolant freezing point threshold, the valve opening of the regulating valve 233 corresponding to the water distribution pipe 231 farthest from the center of the cooling tower (i.e., the water distribution pipe 231 corresponding to the strong cooling zone) is kept at the maximum, and all other regulating valves 233 are closed.

[0094] Furthermore, the nozzle 232 of the water distribution device 2 can be adjusted toward the strong cooling zone according to the arrangement of the nozzle 232.

[0095] When only the nozzle 232 corresponding to the strong cooling zone for supplying coolant is set as a rotatable nozzle, the nozzle of the nozzle 232 corresponding to the strong cooling zone can be directed toward the strong cooling zone, and the nozzles of the nozzles 232 corresponding to the remaining cooling zones 1 can be directed toward the top of the cooling tower; when all the nozzles 232 in the water distribution device 2 are set as rotatable nozzles, the nozzles of all the nozzles 232 can be directed toward the strong cooling zone.

[0096] There are many ways to implement the normal temperature efficiency adjustment step. When it is monitored that the coolant temperature corresponding to the strong cooling zone is not less than the coolant freezing point threshold, the cooling capacity corresponding to different cooling zones 1 can be compared according to the coolant temperature, and then the water distribution device 2 is used to adjust the water distribution amount of different cooling zones 1 according to the cooling capacity, so as to increase the cooling efficiency of the cooling tower.

[0097] In one embodiment, the normal temperature synergistic adjustment step S3.2 includes:

[0098] S3.2.1: Preset coolant freezing point threshold;

[0099] S3.2.2: Determine whether the coolant temperature at the bottom of the strong cooling zone is not less than the coolant freezing point threshold;

[0100] S3.2.3: When the coolant temperature is not less than the coolant freezing point threshold, obtain the coolant temperature corresponding to different cooling zones 1 in real time;

[0101] S3.2.4: Compare the cooling capacities of different cooling zones 1 based on the coolant temperature and obtain a comparison result;

[0102] S3.2.5: Based on the comparison results, use the water distribution device 2 to adjust the water distribution amount of different cooling zones 1.

[0103] In one embodiment, the normal temperature efficiency adjustment step also includes: pointing all the nozzles 232 of the water distribution device 2 toward the top of the cooling tower, thereby increasing the spray height and diffusion area of the coolant, which is beneficial to increase the contact area between the coolant and the cold air, thereby reducing the temperature of the coolant.

[0104] In one embodiment, the adjustment of the water distribution device 2 further includes the adaptation and installation of the water distribution device 2, which specifically includes:

[0105] Water distribution pipes are installed one by one above the cooling zone 1, and the diameters of the water distribution pipes are increased from the center of the cooling tower to the edge of the cooling tower.

[0106] A regulating valve 233 is installed at the water inlet end of each water distribution pipe;

[0107] A number of nozzles 232 are installed on each water distribution pipe, and the number of nozzles 232 is proportional to the cross-sectional area of the corresponding water distribution pipe;

[0108] At this time, the water distribution device 2 is used to adjust the water distribution amount of different cooling zones 1 according to the cooling capacity, including:

[0109] Keep the valve opening of the regulating valve 233 corresponding to the water distribution pipe farthest from the center of the cooling tower at the maximum. Take the valve opening of the regulating valve 233 with the largest opening as the benchmark, and adjust the valve opening of the corresponding regulating valve 233 according to the ratio of the coolant temperature corresponding to different cooling zones 1.

[0110] Specifically, when the cooling tower is in operation, the valve openings of all regulating valves 233 can first be adjusted to 100%. After the coolant temperature stabilizes, the coolant temperature of different cooling zones 1 is obtained in real time. The cooling capacities of different cooling zones 1 are compared by using the corresponding coolant temperatures to obtain a comparison result. The comparison result can be reflected by the ratio of the temperature differences. For example:

[0111] From the edge of the cooling tower to the center, take three different cooling zones 1, a, b, and c, as examples. Assume that the corresponding coolant temperatures at the bottom of the corresponding cooling zone 1 are T a 、T b 、T c , the temperature of the coolant entering the tower is T0, then the cooling capacity ratio of each cooling zone 1 is nsT a :nsT b :nsT c =(T a -T0):(T b -T0):(T c -T0). When adjusting the water distribution rate based on this comparison result, the water distribution rate corresponding to cooling zone 1 (a) can be kept unchanged (the opening of regulating valve 233 remains unchanged). The openings of regulating valves 233 corresponding to cooling zones 1 (b) and (c) can be adjusted according to the corresponding ratios. For example, in a specific operating condition, the cooling tower inlet water temperature is 41.54°C, and the coolant temperatures of cooling zones 1 from the inside out are 36.16°C, 34.74°C, and 32.60°C, respectively. In this case, the opening ratio of regulating valves 233 corresponding to the cooling zones can be set to 1:0.76:0.60.

[0112] Preferably, the coolant freezing point threshold is set according to the coolant characteristics, and can generally be set to 2 to 3°C.

[0113] like Figure 3 、 Figure 4 As shown, this embodiment also provides a water distribution system for distributing water using the above-mentioned water distribution method, including:

[0114] Cooling zone 1 is used to cool the coolant, wherein the cooling zone 1 farthest from the center of the cooling tower is the intensive cooling zone;

[0115] a water distribution device 2 for supplying coolant to the cooling zone 1;

[0116] A coolant temperature real-time monitoring module 3 is used to monitor the coolant temperature passing through all cooling zones 1;

[0117] The water distribution device regulating module 4 is used to regulate the water distribution amount of the water distribution device 2 to different cooling zones 1 and / or regulate the water spraying direction of the water distribution device 2 according to the coolant temperature.

[0118] like Figure 3 、 Figure 4 As shown, the system also includes a packing layer 5, a temperature detection device 6, a water collection tank 7, and a processing center 8.

[0119] The cooling zone 1 is arranged on the packing layer 5, and the temperature detection device 6 is arranged at the bottom of the packing layer 5;

[0120] The temperature detection device 6 is electrically connected to the coolant temperature real-time monitoring module 3;

[0121] The processing center 8 is electrically connected to the coolant temperature real-time monitoring module 3 and the water distribution device regulating module 4 .

[0122] Specifically, the position of the temperature detection device 6 is set according to the cooling zone 1. Each cooling zone 1 is correspondingly provided with a temperature detection device 6. One, two or more temperature detection devices 6 can be set in the same cooling zone 1. When the number exceeds one, they can be distributed in a circular array around the center of the cooling tower. When obtaining the coolant temperature, the average value of the temperature detection device 6 can be calculated, thereby making the detection accuracy more accurate.

[0123] Specifically, the processing center 8 can be set in the DCS system of the power plant. The processing center 8 is used to process monitoring data and output signals within the system. Furthermore, the processing center 8 includes: a coolant freezing point threshold value preset unit 81, a temperature judgment unit 82, a cooling capacity comparison unit 83, and an adjustment signal output unit 84. Among them, the coolant freezing point threshold value preset unit 81 is used to set the coolant freezing point threshold, which can generally be set to 2 to 3°C; the temperature judgment unit 82 is used to judge the coolant temperature monitored by the real-time coolant temperature real-time monitoring module 3 (mainly the coolant temperature of the cooling zone 1 farthest from the center of the cooling tower) and the coolant freezing point threshold value preset by the coolant freezing point threshold value preset unit 81, and generate a judgment result; the cooling capacity comparison unit 83 is used to compare the cooling capacity of different cooling zones 1 according to the coolant temperature to obtain a comparison result; the adjustment signal output unit 84 is used to output an adjustment signal based on the judgment result and the comparison result to control the water distribution device adjustment module 4, and then control the nozzle 232 and the regulating valve 233 to achieve the adjustment of the water distribution amount or water spraying direction of the water distribution device 2.

[0124] like Figure 4 、 Figure 5 、 Figure 6 As shown, the water distribution device 2 includes: a central shaft 21, a water distribution pipeline 22, and a water spraying pipeline 23; the water spraying pipeline 23 is connected to the central shaft 21 through the water distribution pipeline 22; the water spraying pipeline 23 includes a water distribution pipe 231, and a plurality of water distribution pipes 231 are arranged at equal distances along the radial direction of the central shaft 21. Specifically, three, four or more water distribution pipes 231 are arranged at equal distances along the radial direction of the central shaft 21, and the plurality of water distribution pipes 231 distributed from the center of the central shaft 21 to the edge of the cooling tower have a pipe diameter of gradually increases; each water distribution pipe 231 is connected to a plurality of nozzles 232, and at least the nozzle 232 connected to the water distribution pipe 231 with the largest diameter is set as a rotatable nozzle 232; the number of nozzles 232 connected to the water distribution pipe 231 is proportional to the cross-sectional area of the water distribution pipe 231; the water distribution pipeline 22 includes a plurality of regulating valves 233 that control the amount of water distributed from the central vertical shaft 21 to different water distribution pipes 231; the rotatable nozzles 232 and the regulating valves 233 are both electrically connected to the water distribution device regulating module 4.

[0125] Specifically, since the central shaft 21 of the cooling tower is centered in the radial direction pointing to the outer wall (edge) of the cooling tower, the wind speed and air volume of the cooling air show a distribution characteristic of gradually increasing from small to large, and the cooling capacity of the cooling tower shows a distribution characteristic of gradually increasing from weak to strong, and the cooling capacity of the areas at a similar distance from the center is similar. Therefore, the diameters of the several water distribution pipes 231 distributed from the center of the central shaft 21 to the edge (outer wall) of the cooling tower gradually increase (the diameters of different water distribution pipes 231 vary, and the diameters of the water distribution pipes 231 at the same distance from the center of the cooling tower are the same); each water distribution pipe 231 is connected to several nozzles 232. In order to achieve quantitative water distribution to different cooling zones 1, the number of nozzles 232 connected to the water distribution pipe 231 is proportional to the cross-sectional area of the water distribution pipe 231.

[0126] Furthermore, to adjust the water distribution direction of the water distribution device 2, the nozzle 232 can be configured as a rotating nozzle. In addition, since the temperature of the cooling water circulating at the outermost periphery is generally lower than the freezing point threshold when the ambient temperature is low, the nozzle 232 connected to the largest water distribution pipe 231 (i.e., the outermost water distribution pipe 231 near the edge of the cooling tower) can also be configured as a rotating nozzle. The water spray pipeline 23 also includes a number of regulating valves 233 that control the amount of water distributed from the central shaft 21 to different water distribution pipes 231; the rotatable nozzle and regulating valve 233 are both electrically connected to the water distribution device regulating module 4, thereby achieving electric adjustment of the rotatable nozzle and regulating valve 233. The rotatable nozzle and regulating valve 233 can also be manually adjusted.

[0127] The water distribution pipeline 22 and the water spray pipeline 23 can be set to various combination structures, which can achieve quantitative water distribution and water distribution amount adjustment for the cooling zone 1.

[0128] like Figure 5 As shown, in one embodiment, the water distribution pipe 231 is configured as an annular water distribution pipe 2311; the water distribution pipeline 22 includes a plurality of water supply pipes 220 corresponding to the annular water distribution pipes 2311, the water supply pipes 220 are connected to the central shaft 21 and the corresponding annular water distribution pipes 2311, and each water supply pipe 220 is installed with a regulating valve 233; the diameter of the water supply pipe 220 is equal to the diameter of the corresponding annular water distribution pipe 2311, and the sum of the cross-sectional areas of all the water supply pipes 220 is equal to the cross-sectional area of the central shaft 21. Specifically, Figure 6 For example, the annular water distribution pipe 2311 is set with three pipes d, e, and f at equal distances from the edge of the cooling tower to the center, and the corresponding pipe diameter can be set to R d 、R e 、R f The water delivery pipes 220 corresponding to the three annular water distribution pipes 2311 d, e, and f are g, h, and i, respectively, and their corresponding pipe diameters are set to R g 、R h 、R i The number of nozzles 232 connected to the three annular water distribution pipes 2311 d, e, and f is N respectively. d 、N e 、N f , the diameter corresponding to the central shaft 21 is R0, then the relationship between the parameters is:

[0129] R0>R d =R g >R e =R h >R f =R i ;

[0130] R g 2 +R h 2 +R i 2 =R0 2 ;

[0131] R d 2 :R e 2 :R f 2 =N d :N e :N f .

[0132] This design can achieve quantitative water distribution to different cooling zones 1 by controlling the opening of the regulating valve 233 using the water supply pipe 220, the annular water distribution pipe 2311 and the nozzle 232. In this solution, only the regulating valves 233 corresponding to the number of water supply pipes 220 need to be controlled, which makes adjustment more convenient.

[0133] like Figures 6 to 9 As shown, in another embodiment, the water distribution pipeline 22 includes a plurality of first water distribution pipes 221 distributed in a circular array around the central shaft 21, and one end of the first water distribution pipe 221 is connected to the central shaft 21; the water distribution pipe 231 is configured as an arc-shaped water distribution pipe 2312, and a plurality of arc-shaped water distribution pipes 2312 are arranged along the central axis of the first water distribution pipe 221; each first water distribution pipe 221 is connected to the arc-shaped water distribution pipe 2312 arranged along the central axis thereof through the second water distribution pipe 222. shaped water distribution pipe 2312, the second water distribution pipe 222 is arranged in a one-to-one correspondence with the arc-shaped water distribution pipe 2312; the diameter of the second water distribution pipe 222 is equal to the diameter of the arc-shaped water distribution pipe 2312 connected to it, and the sum of the cross-sectional areas of all the second water distribution pipes 222 is equal to the cross-sectional area of the first water distribution pipe 221, and the sum of the cross-sectional areas of all the first water distribution pipes 221 is equal to the cross-sectional area of the central vertical shaft 21; a regulating valve 233 is installed on each second water distribution pipe 222.

[0134] Specifically, Figures 7 to 9 For example, the arc-shaped water distribution pipe 2312 is set at equal distances from the edge of the cooling tower to the center, and the three are distributed in a fan shape. The corresponding pipe diameter can be set to R j 、R k 、R m The second water distribution pipes 222 corresponding to the three arc-shaped water distribution pipes 2312 j, k, and m are o, p, and q, respectively, and their corresponding pipe diameters are set to R o 、R p 、R q The number of nozzles 232 connected to the three arc-shaped water distribution pipes 2312 j, k, and m is N respectively. j 、N k 、N m , the diameter of the central shaft 21 is R0, and the diameter of the first water distribution pipe 221 is R1. The relationship between the parameters is:

[0135] R0>R1>R j =R o >R k =R p >R m =R q ;

[0136] nR1 2 =R0 2 (n is the number of first water distribution pipes 221);

[0137] R o 2 +R p 2 +R q 2 =R1 2 ;

[0138] R j 2 :R k 2 :R m 2 =N j :N k :N m .

[0139] In this design, the arc-shaped water distribution pipe 2312, the second water distribution pipe 222, and the first water distribution pipe 221 are combined and arranged into several groups. Compared with the overall setting of the structure (such as the annular water distribution pipe 2311), it is easier to determine the location of the fault point during subsequent maintenance, which facilitates maintenance.

[0140] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A cooling tower water distribution method, characterized in that: include: The cooling zone setting includes setting a plurality of cooling zones along the radial direction of the cooling tower, and the cooling zone farthest from the center of the cooling tower is a strong cooling zone; Real-time monitoring of the coolant temperature, including monitoring the coolant temperature at the bottom of the different cooling zones; Water distribution device adjustment, including low temperature antifreeze adjustment steps or normal temperature efficiency adjustment steps; The low-temperature antifreeze adjustment step includes: when it is detected that the coolant temperature corresponding to the strong cooling zone is lower than the coolant freezing point threshold, adjusting the water distribution device to increase the water distribution amount to the strong cooling zone and / or adjusting the nozzle of the water distribution device to face the strong cooling zone; The normal temperature efficiency enhancement step includes: when it is monitored that the coolant temperature corresponding to the strong cooling zone is not less than the coolant freezing point threshold, comparing the cooling capacities corresponding to different cooling zones according to the coolant temperature, and adjusting the water distribution amount of different cooling zones using the water distribution device according to the cooling capacity.

2. A cooling tower water distribution method according to claim 1, characterized in that: The low-temperature antifreeze adjustment step includes: Presetting the freezing point threshold of the coolant; Determining whether the coolant temperature at the bottom of the strong cooling zone is less than the coolant freezing point threshold; When the coolant temperature is lower than the coolant freezing point threshold, adjusting the water distribution device to increase the water distribution amount to the strong cooling zone; determining again whether the coolant temperature at the bottom of the strong cooling zone is less than the coolant freezing point threshold; When the coolant temperature is still lower than the coolant freezing point threshold, the nozzle of the water distribution device is adjusted to face the strong cooling zone.

3. A cooling tower water distribution method according to claim 2, characterized in that: The step of adjusting the nozzle of the water distribution device toward the strong cooling zone comprises: Direct the nozzles of the nozzles corresponding to the strong cooling zone toward the strong cooling zone, and direct the nozzles of the nozzles corresponding to the remaining cooling zones toward the top of the cooling tower; or, Direct all the nozzle nozzles toward the strong cooling zone.

4. A cooling tower water distribution method according to claim 1, characterized in that: The normal temperature synergistic adjustment step comprises: Preset coolant freezing point threshold; Determining whether the coolant temperature at the bottom of the strong cooling zone is not less than the coolant freezing point threshold; When the coolant temperature is not less than the coolant freezing point threshold, obtaining the coolant temperatures corresponding to the different cooling zones in real time; comparing the cooling capacities of the different cooling zones according to the coolant temperature to obtain a comparison result; According to the comparison result, the water distribution device is used to adjust the water distribution amount of different cooling zones; The normal temperature synergistic adjustment step further includes: All nozzles of the water distribution device are directed toward the top of the cooling tower.

5. A cooling tower water distribution method according to claim 4, characterized in that: The water distribution device adjustment also includes the water distribution device adaptation installation, which specifically includes: A water distribution pipe is installed above the cooling zone in a one-to-one correspondence, and a plurality of water distribution pipes are arranged from the center of the cooling tower to the edge of the cooling tower, with the pipe diameter increasing in sequence; A regulating valve is installed at the water inlet end of each water distribution pipe; A plurality of nozzles are installed on each of the water distribution pipes, and the number of the nozzles is proportional to the cross-sectional area of the corresponding water distribution pipe; The step of adjusting the water distribution amount of different cooling zones by using the water distribution device according to the cooling capacity includes: Keep the valve opening of the regulating valve corresponding to the water distribution pipe farthest from the center of the cooling tower at the maximum, and adjust the valve opening of the corresponding regulating valve according to the ratio of the coolant temperatures corresponding to different cooling zones based on the valve opening of the regulating valve with the largest opening as a reference.

6. A cooling tower water distribution system, which distributes water using the method according to any one of claims 1 to 5, characterized in that: include: A cooling zone, used to cool the coolant, wherein the cooling zone farthest from the center of the cooling tower is a strong cooling zone; a water distribution device for supplying coolant to the cooling zone; A coolant temperature real-time monitoring module, used to monitor the coolant temperature passing through all the cooling zones; The water distribution device regulating module is used to regulate the water distribution amount of the water distribution device to different cooling zones and / or regulate the water spraying direction of the water distribution device according to the coolant temperature.

7. A cooling tower water distribution system according to claim 6, characterized in that: The water distribution device includes: a central vertical shaft, a water distribution pipeline, and a water spray pipeline; The water spray pipeline is connected to the central shaft through the water distribution pipeline; The water spray pipeline includes a water distribution pipe, and a plurality of the water distribution pipes are arranged at equal distances along the radial direction of the central shaft, and the diameters of the plurality of water distribution pipes distributed from the center of the central shaft to the edge of the cooling tower gradually increase; Each of the water distribution pipes is connected to a plurality of nozzles, and at least the nozzle connected to the water distribution pipe with the largest diameter is configured as a rotatable nozzle; The number of the nozzles connected to the water distribution pipe is proportional to the cross-sectional area of the water distribution pipe; The water distribution pipeline includes several regulating valves that control the amount of water distributed from the central shaft to different water distribution pipes; The rotatable spray head and the regulating valve are both electrically connected to the water distribution device regulating module.

8. A cooling tower water distribution system according to claim 7, characterized in that: The water distribution pipe is configured as a ring-shaped water distribution pipe; The water distribution pipeline includes a plurality of water supply pipes arranged in a one-to-one correspondence with the annular water distribution pipes, the water supply pipes are connected to the central vertical shaft and the corresponding annular water distribution pipes, and each of the water supply pipes is installed with a regulating valve; The diameter of the water supply pipe is equal to the diameter of the annular water distribution pipe connected thereto, and the sum of the cross-sectional areas of all the water supply pipes is equal to the cross-sectional area of the central vertical shaft.

9. A cooling tower water distribution system according to claim 7, characterized in that: The water distribution pipeline includes a plurality of first water distribution pipes distributed in a circular array around the central vertical shaft, and one end of the first water distribution pipe is connected to the central vertical shaft; The water distribution pipe is configured as an arc-shaped water distribution pipe, and a plurality of the arc-shaped water distribution pipes are provided along the central axis of the first water distribution pipe; Each of the first water distribution pipes is connected to an arc-shaped water distribution pipe arranged along the central axis thereof through a second water distribution pipe, and the second water distribution pipes are arranged in a one-to-one correspondence with the arc-shaped water distribution pipes; The diameter of the second water distribution pipe is equal to the diameter of the arc-shaped water distribution pipe connected thereto, and the sum of the cross-sectional areas of all the second water distribution pipes is equal to the cross-sectional area of the first water distribution pipe, and the sum of the cross-sectional areas of all the first water distribution pipes is equal to the cross-sectional area of the central vertical shaft; One regulating valve is installed on each of the second water distribution pipes.

10. A cooling tower water distribution system according to claim 6, characterized in that: It also includes a packing layer, a temperature detection device, a water collection tank, and a processing center. The cooling zone is arranged on the packing layer, and the temperature detection device is arranged at the bottom of the packing layer; The temperature detection device is electrically connected to the coolant temperature real-time monitoring module; The processing center is electrically connected to the coolant temperature real-time monitoring module and the water distribution device regulating module.

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