Low-resistance mixed ventilation cooling system and control method

Abstract

The low-resistance mixed ventilation cooling system comprises an axial flow fan arranged on a cooling tower, wind shielding roller shutters are arranged on the portions, located on the two sides of the axial flow fan, of the cooling tower correspondingly, and the end faces of the sides, away from the axial flow fan, of the two wind shielding roller shutters are connected to a cooling triangle through wind guiding walls; the cooling triangle is connected with a cooling working medium conveying assembly; an electric winding and unwinding device is arranged on the wind shielding roller shutter, and the electric winding and unwinding device and a start-stop controller of the axial flow fan are in communication connection with a controller. The controller controls the axial flow fan and the wind shielding roller shutter to be started and stopped based on the obtained operation and maintenance parameters. Switching of the axial flow fan and the wind shielding roller shutter is controlled through operation and maintenance parameters, output of the cooling system is controlled by rapidly switching operation modes, the cooling capacity of the condenser is matched in time, back pressure fluctuation is effectively restrained, and unit peak regulation is adapted; meanwhile, the size of a conventional air cooling tower is reduced, and strong wind resistance and winter anti-freezing capacity of the cooling tower are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cooling tower auxiliary cooling, and particularly relates to a low-resistance mixed ventilation cooling system and a control method. BACKGROUND

[0002] A significant feature of a new power system is high proportion of new energy access, which puts higher requirements on the flexible adjustment capability of the system. When the generator set rapidly adjusts the load, the steam inlet and outlet volume of the steam turbine rapidly changes. If the condenser cooling capacity (such as circulating water flow, water temperature, and heat exchange air flow) cannot be matched in time, the back pressure of the unit will change and fluctuate, affecting the response speed and stability of the load adjustment. Therefore, the cold end system needs to coordinate and control the cooling system mode and parameters during installation and operation to reduce the influence of back pressure fluctuation on load adjustment.

[0003] The cooling system of the active generator set usually adopts a mechanical ventilation direct air cooling system or a natural ventilation indirect air cooling system, and a small number of units are equipped with a natural ventilation direct air cooling system. Such cooling systems are designed based on the rated operating condition of the unit as the core, and also take into account the demand for a certain length of time of insufficient operation.

[0004] However, the operation characteristics of the new generation of coal-fired units, such as high efficiency, flexibility, rapid and large load variation, peak shaving start-stop, make the units operate in low load condition for a long time, resulting in the problem of excessive capacity of the existing cooling system. During the peak power generation period, especially when encountering severe weather such as strong wind and high temperature, the cooling system will also show the short board of insufficient output, which is the key reason why a large number of active units need to be flexibly modified. SUMMARY

[0005] In order to solve the problem that the existing or newly built generator set is in low load condition for a long time, resulting in excessive capacity of the conventional cooling system, and the cooling system output is insufficient during the peak period of the unit, the application provides a low-resistance mixed ventilation cooling system and a control method. The key to realizing the mixed ventilation cooling system is to build a scientific and reasonable mixed ventilation cooling system unit. The construction of the mixed ventilation cooling system unit should make the cooling tower can easily realize the switching between natural ventilation and mixed ventilation. The application aims to provide a mixed ventilation cooling system unit and a control method thereof. When the mixed ventilation cooling system unit operates in natural ventilation condition, the hindering effect of the stopped fan on the airflow can be greatly reduced, the resistance of the cooling tower system is reduced, and the natural ventilation capacity of the system is fully utilized.

[0006] To achieve the above purpose, the application provides the following technical scheme: The application provides a low-resistance mixed ventilation cooling system, which comprises an axial flow fan arranged on a cooling tower, wind-blocking roller shutters arranged on both sides of the axial flow fan, cooling triangles connected to the end faces of the wind-blocking roller shutters away from the axial flow fan through air guide walls, and cooling working medium conveying assemblies connected to the cooling triangles. The wind-blocking roller shutters are provided with electric winding and unwinding devices, and the electric winding and unwinding devices and the start-stop controller of the axial flow fan are respectively connected to a controller in communication. The controller controls the start-stop of the axial flow fan and the wind-blocking roller shutters based on the obtained operation and maintenance parameters.

[0007] Preferably, a plurality of cooling triangles are arranged side by side between the end heads of the wind-blocking roller shutters away from the axial flow fan.

[0008] Preferably, the length direction of the plurality of cooling triangles is the same as the winding and unwinding direction of the wind-blocking roller shutters.

[0009] Preferably, the cooling working medium conveying assembly comprises a circulating pump, the inlet of the circulating pump is in communication with the outlet of a condenser, the inlet of the condenser is in communication with the outlet of the cooling triangle, and the outlet of the cooling triangle is in communication with the outlet of the circulating pump.

[0010] Preferably, the cooling working medium conveying assembly is a steam exhaust pipeline, and the inlet of the cooling triangle is in communication with the steam exhaust pipeline.

[0011] Preferably, the outlet of the cooling triangle is provided with a water temperature detector connected to the controller in communication. The outside of the cooling tower is provided with a temperature detector connected to the controller in communication. The controller is provided with a data acquisition unit, a ventilation mode determination unit, an execution unit and a storage unit. The data acquisition unit is connected to the water temperature detector, the temperature detector, the load collector of the unit where the cooling tower is located and the storage unit in communication, respectively, for acquiring operation and maintenance parameters, wherein the operation and maintenance parameters comprise the current temperature of circulating water output by the cooling triangle, the current environmental temperature, the current load of the unit and the determination threshold range stored in the storage unit. The ventilation mode determination unit is connected to the data acquisition unit in communication, for comparing the current temperature of circulating water, the current environmental temperature, the current load of the unit with the corresponding determination threshold range, and generating a ventilation mode signal. The execution unit is connected to the ventilation mode determination unit, the electric winding and unwinding device and the start-stop controller in communication, for generating an execution signal based on the ventilation mode signal, and controlling the start-stop controller and the electric winding and unwinding device to work. The storage unit is in communication connection with the ventilation mode determination unit and the data acquisition unit respectively, and is configured to store a determination threshold range, a ventilation mode signal generated by the ventilation mode determination unit, and an execution signal generated by the execution unit.

[0012] Preferably, the determination threshold includes a water temperature threshold, a load threshold, and an ambient temperature threshold. The water temperature threshold includes a first water temperature threshold, a second water temperature threshold, and a third water temperature threshold. The load threshold includes a first load threshold and a second load threshold. The ambient temperature threshold includes a first ambient temperature threshold, a second ambient temperature threshold, and a third ambient temperature threshold.

[0013] Preferably, the determination threshold range includes a water temperature threshold range, a load threshold range, and an ambient temperature threshold range. The water temperature threshold range includes a first water temperature threshold range, a second water temperature threshold range, a third water temperature threshold range, and a fourth water temperature threshold range; the first water temperature threshold range is greater than or equal to the first water temperature threshold, the second water temperature threshold range is less than the first water temperature threshold and greater than or equal to the second water temperature threshold; the third water temperature threshold range is less than the second water temperature threshold and greater than the third water temperature threshold, and the fourth water temperature threshold range is less than or equal to the third water temperature threshold. The load threshold range includes a first load threshold range, a second load threshold range, and a third load threshold range; the first load threshold range is greater than or equal to the first load threshold, the second load threshold range is less than the first load threshold and greater than or equal to the second load threshold, and the third load threshold range is less than or equal to the second load threshold. The ambient temperature threshold range includes a first ambient temperature threshold range, a second ambient temperature threshold range, a third ambient temperature threshold range, and a fourth ambient temperature threshold range; the first ambient temperature threshold range is greater than or equal to the first ambient temperature threshold, the second ambient temperature threshold range is less than the first ambient temperature threshold and greater than or equal to the second ambient temperature threshold; the third ambient temperature threshold range is less than the second ambient temperature threshold and greater than the third ambient temperature threshold, and the fourth ambient temperature threshold range is less than the third ambient temperature threshold.

[0014] Preferably, the ventilation mode signal includes a peak operation mode signal, a natural ventilation mode signal, a hybrid ventilation mode signal, and an anti-freezing operation mode signal. The anti-freezing operation mode signal is generated when any one or more of the following conditions are met: the current temperature of the circulating water is in the fourth water temperature threshold range, and the current ambient temperature is in the fourth ambient temperature threshold range. The generation of the natural ventilation mode signal is that the current circulating water temperature is located in the third water temperature threshold range, the current environment temperature is located in the third environment temperature threshold range, and the current load of the unit is located in the third load threshold range. The generation of the mixed ventilation mode signal is that the current circulating water temperature is located in the second water temperature threshold range, the current environment temperature is located in the second environment temperature threshold range, and the current load of the unit is located in the second load threshold range. The generation of the peak operation mode signal is that any one or more of the following conditions are met: the current circulating water temperature is located in the first water temperature threshold range, the current environment temperature is located in the first environment temperature threshold range, and the current load of the unit is located in the first load threshold range.

[0015] The application provides a method for controlling the low-resistance mixed ventilation cooling system. During mechanical ventilation, the controller controls the starting of the axial flow fan and the closing of the wind-blocking roller blind based on the collected operation and maintenance parameters. During natural ventilation, the controller controls the opening of the wind-blocking roller blind and the closing of the axial flow fan based on the collected operation and maintenance parameters. During mixed ventilation, the controller controls the partial starting or frequency adjustment of the axial flow fan and the adjustment of the opening degree of the wind-blocking roller blind based on the collected operation and maintenance parameters. During anti-freezing operation, the controller controls the closing of the axial flow fan and the wind-blocking roller blind based on the collected operation and maintenance parameters.

[0016] Compared with the prior art, the application has the following beneficial technical effects: The application provides a low-resistance mixed ventilation cooling system, and the controller controls the starting and stopping of the axial flow fan and the wind-blocking roller blind based on the obtained operation and maintenance parameters, so that the natural ventilation and mechanical ventilation in the cooling tower can be freely switched, the environmental adaptability of the cooling system and the operation control flexibility are improved, during the operation of the generator unit, the axial flow fan and the wind-blocking roller blind are switched through the operation and maintenance parameters, the cooling system output is controlled through rapid conversion of the operation mode, when the load of the generator unit is rapidly adjusted and the steam admission and discharge amount of the steam turbine is rapidly changed, the condenser cooling capacity can be matched in time, the back pressure fluctuation can be effectively inhibited, and the peak regulation of the unit can be adapted; meanwhile, the size of the conventional air cooling tower is reduced, the wind resistance of the cooling tower is improved, and the anti-freezing capacity of the cooling tower in winter is improved. The natural ventilation and mechanical ventilation dual modes are innovatively integrated, the adaptability of the cooling system to complex environments can be improved, and the operation control flexibility can be improved. The above advantages make the system an ideal choice for the cooling system matched with the peak regulation unit.

[0017] Further, in the system, when the axial flow fan is running, the wind-blocking roller blind is closed to ensure that the air flow is not bypassed and is driven by the axial flow fan; when the axial flow fan is stopped (natural ventilation mode) or partially stopped, the wind-blocking roller blind is opened or partially opened to reduce the fan resistance by bypass ventilation. When the cooling tower is running in winter at low temperature and has freezing risk, the wind-blocking roller blind can be partially opened or fully closed according to the air temperature, which helps to reduce the freezing pressure of the cooling tower. The air guide wall helps to reduce the draught phenomenon in the inlet area of the cooling tower in a strong wind environment and improve the wind resistance of the cooling tower. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A cross-sectional schematic view of a low-resistance hybrid ventilation cooling system according to the present application is shown in FIG. 1. Figure 2 A structural schematic view of the low-resistance hybrid ventilation cooling system according to the present application in an open state of the wind-blocking roller blind is shown in FIG. 2. Figure 3 A structural schematic view of the low-resistance hybrid ventilation cooling system according to the present application in a closed state of the wind-blocking roller blind is shown in FIG. 3. Figure 4 A plan structural schematic view of the low-resistance hybrid ventilation cooling system according to the present application in an open state of the wind-blocking roller blind is shown in FIG. 4. Figure 5 A plan structural schematic view of the low-resistance hybrid ventilation cooling system according to the present application in a closed state of the wind-blocking roller blind is shown in FIG. 5. In the drawings: 1, cooling tower; 2, cooling triangle; 3, axial flow fan; 4, wind-blocking roller blind; 5, air guide wall. DETAILED DESCRIPTION

[0019] In the following, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0020] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0021] In addition, the terms "first", "second", etc. are used only to describe the purpose and should not be understood as indicating or implying relative importance or implying a specified number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0022] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected, or it can be communicated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0023] In the present application, unless otherwise explicitly specified and limited, the "first" feature is "on" or "under" the "second" feature, which can include the first and second features in direct contact, or the first and second features not in direct contact but in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0024] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0025] The present application proposes a low-resistance hybrid ventilation cooling system, such as Figures 1-5As shown, the cooling tower 1 is provided with an axial flow fan 3 arranged on the cooling tower 1, and the axial flow fan 3 is arranged vertically on the inner side of the cooling tower 1, and the two sides of the axial flow fan 3 are provided with wind-blocking roller shutters 4 outside the cooling tower 1, the wind-blocking roller shutters 4 are arranged along the radial direction of the cooling tower 1, and the extension line passes through the ground projection center of the cooling tower 1; the two wind-blocking roller shutters 4 are connected with cooling triangles 2 on the side end face away from the axial flow fan 3 through air guide walls 5, the cooling triangles 2 are arranged vertically on the outer side of the cooling tower 1 according to the conventional mode, and correspond to the axial flow fan 3, and the cooling triangles 2 are connected with cooling working medium conveying assemblies; the wind-blocking roller shutters 4 are provided with electric winding and unwinding devices, and the electric winding and unwinding devices and the start-stop controller of the axial flow fan 3 are respectively connected with a controller in communication; wherein the controller controls the start-stop of the axial flow fan 3 and the wind-blocking roller shutters 4 based on the obtained operation and maintenance parameters, and when the axial flow fan 3 is running, the wind-blocking roller shutters 4 are closed to ensure that the airflow is not bypassed and is driven by the axial flow fan; when the axial flow fan 3 is stopped (natural ventilation mode) or partially stopped, the wind-blocking roller shutters 4 are opened or partially opened, the bypass ventilation is realized, the fan resistance is minimized, the environmental adaptability of the cooling system and the operation control flexibility are improved, during the operation of the generator set, the axial flow fan 3 and the wind-blocking roller shutters 4 are switched to realize the ventilation mode through the operation and maintenance parameters, the airflow is reduced, the natural ventilation cooling performance is fully utilized, the long-term operation of the axial flow fan 3 is reduced, and the service life of the axial flow fan 3 is prolonged and the maintenance cost of the axial flow fan 3 is reduced.

[0026] In the embodiment, the cooling triangles 2 are provided in plurality, the plurality of cooling triangles 2 are arranged side by side between the end heads of the two wind-blocking roller shutters 4 away from the axial flow fan 3, and the length direction of the plurality of cooling triangles 2 is the same as the winding direction of the wind-blocking roller shutters 4, and the ventilation cooling efficiency of the cooling tower 1 is improved through the plurality of cooling triangles 2.

[0027] In the embodiment, when the cooling working medium is water, the cooling working medium conveying assembly includes a circulating pump, the inlet of the circulating pump is communicated with the outlet of a condenser, the inlet of the condenser is communicated with the outlet of the cooling triangle 2, and the inlet of the cooling triangle 2 is communicated with the outlet of the circulating pump, through the adaptation of the circulating pump, the cooling triangle 2 can continuously convey the water to be cooled, the temperature of the cooling triangle 2 is controlled by switching the ventilation mode of the cooling tower 1, and the cooling efficiency of the cooling tower 1 is improved.

[0028] In the embodiment, when the cooling working medium is steam, the cooling working medium conveying assembly is a steam exhaust pipeline, the inlet of the cooling triangle 2 is communicated with the steam exhaust pipeline, and steam is conveyed into the cooling triangle 2 through the steam exhaust pipeline.

[0029] In the embodiment, a water temperature detector is arranged on the outlet of the cooling triangle 2 and is in communication connection with the controller, and the current temperature of the circulating water output from the outlet of the cooling triangle 2 is collected by the water temperature detector; a temperature detector is arranged outside the cooling tower 1 and is in communication connection with the controller, and the temperature detector is used to collect the current ambient temperature of the position where the cooling tower 1 is located.

[0030] In the embodiment, the controller is provided with a data acquisition unit, a ventilation mode determination unit, an execution unit and a storage unit; The data acquisition unit is in communication connection with the water temperature detector, the temperature detector, a load collector of the unit where the cooling tower 1 is located and the storage unit, respectively, and is used to acquire operation and maintenance parameters, wherein the operation and maintenance parameters include the current temperature of the circulating water output by the cooling triangle 2, the current ambient temperature, the current load of the unit, and the determination threshold range stored in the storage unit; The ventilation mode determination unit is in communication connection with the data acquisition unit, and is used to compare the current temperature of the circulating water, the current ambient temperature, the current load of the unit with the corresponding determination threshold range, and generate a ventilation mode signal; The execution unit is in communication connection with the ventilation mode determination unit, the electric winding and un-winding device and the start-stop controller, and is used to generate an execution signal based on the ventilation mode signal, and control the start-stop controller and the electric winding and un-winding device to work; The storage unit is in communication connection with the ventilation mode determination unit and the data acquisition unit, respectively, and is used to store the determination threshold range, the ventilation mode signal generated by the ventilation mode determination unit and the execution signal generated by the execution unit. The determination threshold includes a water temperature threshold, a load threshold and an ambient temperature threshold; the water temperature threshold includes a first water temperature threshold, a second water temperature threshold and a third water temperature threshold; the load threshold includes a first load threshold and a second load threshold; the ambient temperature threshold includes a first ambient temperature threshold, a second ambient temperature threshold and a third ambient temperature threshold; wherein the water temperature threshold range includes a first water temperature threshold range, a second water temperature threshold range, a third water temperature threshold range and a fourth water temperature threshold range; the first water temperature threshold range is greater than or equal to the first water temperature threshold, the second water temperature threshold range is less than the first water temperature threshold and greater than or equal to the second water temperature threshold; the third water temperature threshold range is less than the second water temperature threshold and greater than the third water temperature threshold, and the fourth water temperature threshold range is less than or equal to the third water temperature threshold; The load threshold range includes a first load threshold range, a second load threshold range and a third load threshold range; the first load threshold range is greater than or equal to the first load threshold, the second load threshold range is less than the first load threshold and greater than or equal to the second load threshold, and the third load threshold range is less than or equal to the second load threshold; The environment temperature threshold range comprises a first environment temperature threshold range, a second environment temperature threshold range, a third environment temperature threshold range and a fourth environment temperature threshold range; the first environment temperature threshold range is equal to or greater than a first environment temperature threshold, the second environment temperature threshold range is less than the first environment temperature threshold and equal to or greater than a second environment temperature threshold; the third environment temperature threshold range is less than the second environment temperature threshold and greater than a third environment temperature threshold, and the fourth environment temperature threshold range is less than the third environment temperature threshold.

[0031] The ventilation mode signal comprises a peak operation mode signal, a natural ventilation mode signal, a mixed ventilation mode signal and an anti-freezing operation mode signal; the anti-freezing operation mode signal is generated when any one or more of the following conditions are met: the current circulating water temperature is in the fourth water temperature threshold range and the current environment temperature is in the fourth environment temperature threshold range; The natural ventilation mode signal is generated when the following conditions are met: the current circulating water temperature is in the third water temperature threshold range, the current environment temperature is in the third environment temperature threshold range and the current load of the unit is in the third load threshold range; The mixed ventilation mode signal is generated when the following conditions are met: the current circulating water temperature is in the second water temperature threshold range, the current environment temperature is in the second environment temperature threshold range and the current load of the unit is in the second load threshold range; The peak operation mode signal is generated when any one or more of the following conditions are met: the current circulating water temperature is in the first water temperature threshold range, the current environment temperature is in the first environment temperature threshold range and the current load of the unit is in the first load threshold range.

[0032] The application further provides a method for controlling the low-resistance mixed ventilation cooling system, comprising the following steps: During mechanical ventilation, the controller controls the axial flow fan 3 to start and the windproof roller shutter 4 to close based on the collected operation and maintenance parameters; during natural ventilation, the controller controls the windproof roller shutter 4 to open and the axial flow fan 3 to close based on the collected operation and maintenance parameters; during mixed ventilation, the controller controls the axial flow fan 3 to start partially or adjust the frequency and controls the opening degree of the windproof roller shutter 4 to adjust based on the collected operation and maintenance parameters; and during anti-freezing operation, the controller controls the axial flow fan 3 and the windproof roller shutter 4 to close based on the collected operation and maintenance parameters.

[0033] For example, the first water temperature threshold is 40 DEG C, the second water temperature threshold is 30 DEG C and the third water temperature threshold is 10 DEG C; the first load threshold is 70% of the rated load, the second load threshold is 30% of the rated load; the first environment temperature threshold is 32 DEG C, the second environment temperature threshold is 20 DEG C and the third environment temperature threshold is 5 DEG C.

[0034] The first water temperature threshold range is ≥40℃, the second water temperature threshold range is <40℃ and ≥30℃, the third water temperature threshold range is <30℃ and >10℃, and the fourth water temperature threshold range is ≤10℃; The first load threshold range is ≥70% of the rated load, the second load threshold range is <70% of the rated load and ≥30% of the rated load, and the third load threshold range is ≤30% of the rated load. The first ambient temperature threshold range is ≥32℃, the second ambient temperature threshold range is <32℃ and ≥20℃, the third ambient temperature threshold range is <20℃ and ≥5℃, and the fourth ambient temperature threshold range is <5℃.

[0035] The controller obtains the current circulating water temperature, the current ambient temperature, the current unit load and the determination threshold range stored in the storage unit, and compares the current circulating water temperature, the current ambient temperature and the current unit load with the corresponding threshold range respectively. If any one or more of the conditions that the current circulating water temperature is in the first water temperature threshold range, the current ambient temperature is in the first ambient temperature threshold range and the current unit load is in the first load threshold range are met, that is, one or more of the conditions that the current circulating water temperature is ≥40℃, the current ambient temperature is ≥32℃ or the current unit load is ≥70% of the rated load are met, a peak running mode signal is generated, and the execution unit generates an execution signal based on the peak running mode signal, the execution signal including closing the wind-blocking roller shutter 4, starting the axial flow fan 3 and performing mechanical ventilation.

[0036] If any one or more of the conditions that the current circulating water temperature is in the third water temperature threshold range, the current ambient temperature is in the third ambient temperature threshold range and the current unit load is in the third load threshold range are met, that is, one or more of the conditions that the current circulating water temperature is <40℃ and ≥30℃, the current ambient temperature is <32℃ and ≥20℃, and the current unit load is <70% of the rated load and ≥30% of the rated load are met, a mixed ventilation mode signal is generated, and the execution unit generates a second execution signal based on the mixed ventilation mode signal, the second execution signal including adjusting the opening degree of the wind-blocking roller shutter 4, partially opening or frequency-regulating the axial flow fan 3 and performing mixed ventilation.

[0037] If the current temperature of the circulating water is in the third water temperature threshold range, the current environment temperature is in the third environment temperature threshold range, and the current load of the unit is in the third load threshold range; that is, the current temperature of the circulating water < 30℃, and the current temperature of the circulating water > 10℃, the current environment temperature < 32℃, and the current environment temperature < 20℃, and the current environment temperature ≥ 5℃, and the current load of the unit ≤ 30% of the rated load, any one or more of the conditions are met, a natural ventilation mode signal is generated, and the execution unit generates a third execution signal based on the natural ventilation mode signal. The third execution signal includes that the wind-blocking roller shutter 4 is fully opened, and the axial flow fan 3 is stopped, and natural ventilation is performed.

[0038] If any one or more of the conditions that the current temperature of the circulating water is in the fourth water temperature threshold range, the current environment temperature is in the fourth environment temperature threshold range, and the current load of the unit is in the fourth load threshold range are met; that is, any one or more of the conditions that the current temperature of the circulating water ≤ 10℃, and the current environment temperature < 5℃ are met, a freeze-proof operation mode signal is generated, and the execution unit generates a fourth execution signal based on the freeze-proof operation mode signal. The fourth execution signal includes that the wind-blocking roller shutter 4 is fully closed, and the axial flow fan 3 is stopped.

[0039] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting in any respect, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0040] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand. The above is only to illustrate the technical idea of the present application, and cannot limit the protection scope of the present application, and any modification made on the basis of the technical solutions of the present application falls within the protection scope of the claims of the present application.

Claims

1. A low-resistance hybrid ventilation cooling system, characterized in that, The cooling tower (1) includes an axial flow fan (3) installed on the cooling tower (1). Windproof roller shutters (4) are respectively installed on both sides of the axial flow fan (3) on the cooling tower (1). The two windproof roller shutters (4) are connected to the cooling triangle (2) through the air guide wall (5) on the side of the side away from the axial flow fan (3). The cooling triangle (2) is connected to a cooling medium conveying assembly. The windproof roller shutter (4) is equipped with an electric roller, and the start / stop controller of the electric roller and the axial flow fan (3) are respectively connected to the controller. The controller controls the start and stop of the axial flow fan (3) and the windproof roller shutter (4) based on the acquired operation and maintenance parameters.

2. The low-resistance hybrid ventilation and cooling system according to claim 1, characterized in that, Multiple cooling triangles (2) are provided, and multiple cooling triangles (2) are arranged side by side between the ends of the two windproof roller shutters (4) on the side away from the axial flow fan (3).

3. The low-resistance hybrid ventilation and cooling system according to claim 2, characterized in that, The length direction of the plurality of cooling triangles (2) is the same as the rolling direction of the windproof roller shutter (4).

4. The low-resistance hybrid ventilation cooling system according to claim 1, characterized in that, The cooling working fluid delivery assembly includes a circulating pump, the inlet of which is connected to the outlet of the condenser, the inlet of which is connected to the outlet of the cooling triangle (2), and the inlet of the cooling triangle (2) is connected to the outlet of the circulating pump.

5. A low-resistance hybrid ventilation and cooling system according to claim 1, characterized in that, The cooling medium conveying component is a steam exhaust pipe, and the inlet of the cooling triangle (2) is connected to the steam exhaust pipe.

6. A low-resistance hybrid ventilation and cooling system according to claim 5, characterized in that, A water temperature detector that is in communication with the controller is provided on the outlet of the cooling triangle (2); The cooling tower (1) is equipped with a temperature detector that is in communication with the controller. The controller is equipped with a data acquisition unit, a ventilation mode determination unit, an execution unit, and a storage unit; The data acquisition unit is connected to the water temperature detector, the temperature detector, the load collector and storage unit of the unit where the cooling tower (1) is located, respectively, and is used to acquire operation and maintenance parameters. The operation and maintenance parameters include the current temperature of the circulating water, the current ambient temperature, the current load of the unit and the judgment threshold range stored in the storage unit, which are output by the cooling triangle (2). The ventilation mode determination unit is communicatively connected to the data acquisition unit and is used to compare the current temperature of the circulating water, the current ambient temperature, the current load of the unit with the corresponding determination threshold range to generate a ventilation mode signal. The execution unit is communicatively connected to the ventilation mode determination unit, the electric winding and unwinding device, and the start-stop controller, and is used to generate an execution signal based on the ventilation mode signal to control the start-stop controller and the electric winding and unwinding device to work. The storage unit is communicatively connected to the ventilation mode determination unit and the data acquisition unit, respectively, and is used to store the determination threshold range, the ventilation mode signal generated by the ventilation mode determination unit, and the execution signal generated by the execution unit.

7. A low-resistance hybrid ventilation and cooling system according to claim 6, characterized in that, The determination thresholds include water temperature threshold, load threshold, and ambient temperature threshold; The water temperature threshold includes a first water temperature threshold, a second water temperature threshold, and a third water temperature threshold; The load threshold includes a first load threshold and a second load threshold; The ambient temperature thresholds include a first ambient temperature threshold, a second ambient temperature threshold, and a third ambient temperature threshold.

8. A low-resistance hybrid ventilation and cooling system according to claim 7, characterized in that, The threshold ranges for determination include water temperature threshold range, load threshold range, and ambient temperature threshold range; The water temperature threshold range includes a first water temperature threshold range, a second water temperature threshold range, a third water temperature threshold range, and a fourth water temperature threshold range; the first water temperature threshold range is greater than or equal to the first water temperature threshold, the second water temperature threshold range is less than the first water temperature threshold and greater than or equal to the second water temperature threshold, the third water temperature threshold range is less than the second water temperature threshold and greater than the third water temperature threshold, and the fourth water temperature threshold range is less than or equal to the third water temperature threshold. The load threshold range includes a first load threshold range, a second load threshold range, and a third load threshold range; the first load threshold range is greater than or equal to the first load threshold, the second load threshold range is less than the first load threshold and greater than or equal to the second load threshold, and the third load threshold range is less than or equal to the second load threshold. The ambient temperature threshold range includes a first ambient temperature threshold range, a second ambient temperature threshold range, a third ambient temperature threshold range, and a fourth ambient temperature threshold range; the first ambient temperature threshold range is greater than or equal to the first ambient temperature threshold, the second ambient temperature threshold range is less than the first ambient temperature threshold and greater than or equal to the second ambient temperature threshold, the third ambient temperature threshold range is less than the second ambient temperature threshold and greater than the third ambient temperature threshold, and the fourth ambient temperature threshold range is less than the third ambient temperature threshold.

9. A low-resistance hybrid ventilation cooling system according to claim 8, characterized in that, The ventilation mode signals include peak operation mode signal, natural ventilation mode signal, mixed ventilation mode signal, and anti-freeze operation mode signal; The antifreeze operation mode signal is generated when one or more of the following conditions are met: the current temperature of the circulating water is within the fourth water temperature threshold range and the current ambient temperature is within the fourth ambient temperature threshold range. The natural ventilation mode signal is generated when the following conditions are met: the current temperature of the circulating water is within the third water temperature threshold range, the current ambient temperature is within the third ambient temperature threshold range, and the current load of the unit is within the third load threshold range. The mixed ventilation mode signal is generated when the following conditions are met: the current temperature of the circulating water is within the second water temperature threshold range, the current ambient temperature is within the second ambient temperature threshold range, and the current load of the unit is within the second load threshold range. The peak operation mode signal is generated when any one or more of the following conditions are met: the current temperature of the circulating water is within the first water temperature threshold range, the current ambient temperature is within the first ambient temperature threshold range, and the current load of the unit is within the first load threshold range.

10. A method for controlling a low-resistance hybrid ventilation cooling system according to any one of claims 1 to 9, characterized in that, include: During mechanical ventilation, the controller controls the axial flow fan (3) to start and the windproof roller shutter (4) to close based on the collected operation and maintenance parameters. During natural ventilation, the controller controls the opening of the windproof roller shutter (4) and the closing of the axial flow fan (3) based on the collected operation and maintenance parameters; During mixed ventilation, the controller controls the axial flow fan (3) to start or adjust the frequency based on the collected operation and maintenance parameters, and controls the windproof roller shutter (4) to adjust the opening degree. During antifreeze operation, the controller controls the axial flow fan (3) and the windproof roller shutter (4) to close based on the collected operation and maintenance parameters.

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