Intelligent circulating water diversion anti-freezing system of cooling tower

Abstract

The invention relates to an intelligent circulating water shunting anti-freezing system of a cooling tower, which is characterized in that a water inlet of a main pipeline of a shunting pipeline in the tower is connected with a circulating water outlet main pipe and is provided with a first electric control valve, and a plurality of jet flow ports are formed in a branch pipeline; the tower edge shunting pipeline is connected with a main pipeline of the tower middle shunting pipeline, a loop is formed along the outer edge of the cooling tower, and a plurality of jet flow openings are formed; the circulating water drainage bypass pipe is connected with the circulating water outlet main pipe and is used for shunting return circulating water; a second electric control valve is arranged at a water inlet of the circulating water drainage bypass pipe; the intelligent control module is used for controlling the opening degree of the first electric control valve and the second electric control valve according to a cooling tower structure three-dimensional calculation model, the circulating water temperature and the environment temperature, the spraying water amount is gradually adjusted along with temperature changes, the circulating water temperature is adjusted while freezing prevention is conducted, and the circulating water temperature is controlled to be within a reasonable range. And economic operation of the unit is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of cooling tower antifreeze, and in particular to an intelligent circulating water diversion antifreeze system for a cooling tower. Background Art

[0002] The cooling towers of thermal power plants in northern my country are very vulnerable to freezing damage. When the cooling tower freezes, it affects the ventilation inside the cooling tower, reduces the efficiency of the cooling tower, and gradually increases the circulating water temperature, thereby reducing the vacuum degree of the condenser. It is very important to take effective winter antifreeze and circulating water temperature regulation to ensure the efficient, safe and economical operation of the cooling tower.

[0003] The current anti-freeze measures generally adopt the method of artificially hanging wind shields to prevent cold, the purpose is to control the amount of air entering the tower to prevent the cooling tower from freezing. However, this anti-freeze measure has the following problems: high intensity, high risk of high-altitude operations, great difficulty in adjustment, and is not suitable for weather changes, day and night temperature differences, and unit peak regulation.

[0004] Therefore, a new antifreeze measure for cooling towers is urgently needed. Summary of the invention

[0005] In view of this, an object of the present invention is to provide an intelligent circulating water diversion antifreeze system for a cooling tower, so as to provide a new way to solve the antifreeze problem of cooling towers.

[0006] According to a first aspect of an embodiment of the present invention, there is provided a cooling tower intelligent circulating water diversion antifreeze system, comprising:

[0007] The diversion pipeline in the tower, the diversion pipeline along the tower, the circulating water drainage bypass pipe and the intelligent control module;

[0008] The branch pipeline in the tower includes a main pipeline and a plurality of branch pipelines connected to the main pipeline; the water inlet of the main pipeline is connected to the circulating water outlet main pipe; a first electric control valve is arranged at the water inlet of the main pipeline; and a plurality of jet ports are arranged on the branch pipeline;

[0009] The tower-side shunt pipeline is connected to the main pipeline of the shunt pipeline in the tower, the tower-side shunt pipeline forms a loop along the outer edge of the cooling tower, and a plurality of jet ports are arranged on the tower-side shunt pipeline;

[0010] The circulating water drainage bypass pipe is connected to the circulating water outlet main pipe and is used to divert the circulating water return water; a second electrically controlled valve is provided at the water inlet of the circulating water drainage bypass pipe;

[0011] The intelligent control module is used to construct a three-dimensional calculation model of the cooling tower structure, obtain the circulating water temperature and the ambient temperature in real time, and control the opening degree of the first electrically controlled valve and the second electrically controlled valve according to the three-dimensional calculation model of the cooling tower structure, the circulating water temperature and the ambient temperature.

[0012] Preferably, in the cooling tower intelligent circulating water shunt antifreeze system, the diameters of the main pipeline of the shunt pipeline and the mid-pipeline of the shunt pipeline in the tower decrease step by step to achieve shunt pressurized transportation.

[0013] Preferably, in the intelligent circulating water shunt antifreeze system for the cooling tower, the branch pipelines of the shunt pipeline in the tower are arranged under the secondary beam below the cooling tower packing bracket.

[0014] Preferably, the cooling tower intelligent circulating water shunt antifreeze system further comprises: an ambient temperature sensor and a water temperature sensor arranged in the circulating water outlet main pipe; the ambient temperature sensor and the water temperature sensor are connected to the intelligent control module;

[0015] The intelligent control module is used to monitor the ambient temperature in real time through the ambient temperature sensor, and the intelligent control module is used to monitor the circulating water temperature in real time through the water temperature sensor.

[0016] Preferably, in the cooling tower intelligent circulating water shunt antifreeze system, the intelligent control module is also used to predict the circulating water temperature according to the real-time circulating water temperature and ambient temperature, and to issue an antifreeze warning when the predicted circulating water temperature result is lower than a preset value.

[0017] The technical solution provided by the embodiments of the present invention may have the following beneficial effects:

[0018] It can be understood that the present invention relates to an intelligent circulating water shunt antifreeze system for a cooling tower, wherein the water inlet of the main pipeline of the shunt pipeline in the tower is connected to the circulating water outlet main pipe, and a first electrically controlled valve is provided, and a plurality of jet ports are provided on the shunt pipeline; the shunt pipeline along the tower is connected to the main pipeline of the shunt pipeline in the tower, forming a loop along the outer edge of the cooling tower, and a plurality of jet ports are provided; the circulating water drainage bypass pipe is connected to the circulating water outlet main pipe, and is used to shunt the circulating water return water; a second electrically controlled valve is provided at the water inlet of the circulating water drainage bypass pipe; the intelligent control module is used to control the opening degree of the first electrically controlled valve and the second electrically controlled valve according to the three-dimensional calculation model of the cooling tower structure, the circulating water temperature and the ambient temperature, so as to gradually adjust the spray water volume as the temperature changes. While preventing freezing, the circulating water temperature is adjusted to control the circulating water temperature within a reasonable range to ensure the economic operation of the unit.

[0019] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0021] Figure 1 It is a schematic diagram of a pipeline of a cooling tower intelligent circulating water diversion antifreeze system according to an exemplary embodiment;

[0022] Figure 2 The present invention is a general schematic diagram of an intelligent circulating water diversion antifreeze system for a cooling tower according to an exemplary embodiment. DETAILED DESCRIPTION

[0023] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0024] In one embodiment, see Figure 1 and Figure 2 , providing a cooling tower intelligent circulating water diversion antifreeze system, including:

[0025] The shunt pipeline in the tower, the shunt pipeline along the tower, the circulating water drainage bypass pipe and the intelligent control module.

[0026] See also Figure 1 The branch pipeline in the tower includes a main pipeline and multiple branch pipelines connected to the main pipeline; the water inlet of the main pipeline is connected to the circulating water outlet main pipe; a first electric-controlled valve is arranged at the water inlet of the main pipeline; and multiple jet outlets are arranged on the branch pipeline.

[0027] In specific practice, the water inlet of the main pipeline of the diverter pipeline in the tower is connected to the main pipe outside the circulating water outlet tower, and a first electric control valve is arranged in the middle. The diameter of the middle pipeline of the diverter pipeline in the tower is diverted and pressurized in a step-by-step manner. The branch pipeline of the diverter pipeline in the tower is provided with countless jets, which can achieve jet cooling. Preferably, the diverter flow rate of the diverter pipeline in the tower is 40% of the rated flow rate of a single circulating water pump.

[0028] In another embodiment, preferably, the diameters of the main pipeline and the mid-pipeline of the diversion pipeline in the tower are gradually reduced to achieve diversion and pressurized transportation. The diversion pipeline of the diversion pipeline in the tower is arranged under the secondary beam below the cooling tower packing bracket.

[0029] The tower-side shunt pipeline is connected to the main pipeline of the shunt pipeline in the tower, the tower-side shunt pipeline forms a loop along the outer edge of the cooling tower, and a plurality of jet ports are arranged on the tower-side shunt pipeline.

[0030] In specific practice, the water inlet of the tower-side shunt pipeline is connected to the main pipeline of the shunt pipeline in the tower, and the tower-side shunt pipeline forms a loop along the outer edge of the cooling tower. The annular pipeline is fixed on the outer edge support of the cooling tower, and a plurality of jet ports are arranged on the jet shunt pipeline to achieve jet cooling. Preferably, the shunt flow rate of the tower-side shunt pipeline is set to 10% of the rated flow rate of a single circulating water pump.

[0031] The circulating water drainage bypass pipe is connected to the circulating water outlet main pipe and is used to divert the circulating water return water; a second electrically controlled valve is arranged at the water inlet of the circulating water drainage bypass pipe.

[0032] The intelligent control module is used to construct a three-dimensional calculation model of the cooling tower structure, obtain the circulating water temperature and the ambient temperature in real time, and control the opening degree of the first electrically controlled valve and the second electrically controlled valve according to the three-dimensional calculation model of the cooling tower structure, the circulating water temperature and the ambient temperature.

[0033] When the cooling tower intelligent circulating water diversion antifreeze system is working, the diversion pipeline in the tower and the diversion pipeline along the tower run synchronously. When the ambient temperature is below zero in winter, turn on the system to cool part of the circulating water return water through the spray antifreeze system, and the other part is led to the cooling tower pool through the circulating water drainage bypass pipe for natural cooling.

[0034] Since the first electrically controlled valve and the second electrically controlled valve are provided, the intelligent control module can adjust the circulating water flow rate in real time according to changes in ambient temperature and circulating water temperature; it can also adjust the circulating water flow rate in real time according to changes in ambient temperature and condenser heat load.

[0035] During winter operation, the circulating water return water is not cooled by the cooling tower filler, but is only guided into the cooling pool for cooling through the circulating water spray and circulating water drainage bypass pipe.

[0036] In specific practice, the intelligent circulating water diversion antifreeze system of the cooling tower adopts a circulating water spray structure. During winter operation, the circulating water return water is not cooled by the cooling tower filler, but only by the circulating water spray system and the circulating water drainage bypass pipe. The amount of spray water is gradually adjusted as the ambient temperature changes, thereby adjusting the circulating water temperature and controlling the circulating water temperature within a reasonable range, thereby ensuring the condenser vacuum and ensuring the economical operation of the unit.

[0037] The intelligent circulating water shunt antifreeze system for the cooling tower shown in this embodiment has an intelligent control module that can create a 3D modeling integrated monitoring platform. Through three-dimensional modeling and simulation analysis of the cooling tower structure, a reasonable antifreeze spray process can be determined. By monitoring the changes in circulating water temperature and ambient temperature and analyzing related data, the intelligent control module realizes intelligent antifreeze control of the cooling tower by controlling the opening degree of the first electronically controlled valve and the second electronically controlled valve.

[0038] In another embodiment, it should be noted that the cooling tower intelligent circulating water shunt antifreeze system also includes: an ambient temperature sensor and a water temperature sensor arranged in the circulating water outlet main pipe; the ambient temperature sensor and the water temperature sensor are connected to the intelligent control module; the intelligent control module is used to monitor the ambient temperature in real time through the ambient temperature sensor, and the intelligent control module is used to monitor the circulating water temperature in real time through the water temperature sensor.

[0039] The intelligent control module can combine the cooling tower and the diversion pipes in the tower and the diversion pipes along the tower to establish a three-dimensional calculation model that can accurately reflect the water temperature distribution of the cooling tower; the intelligent control module has the function of analyzing the impact of operating conditions, unit load, etc. on the water temperature distribution of the wet cooling tower under typical meteorological conditions in severe winter, providing a basis for intelligent antifreeze.

[0040] The intelligent control module can realize the numerical calculation and analysis of the influence of circulating water flow on the cooling performance and water temperature distribution of the cooling tower, calculate the influence of different loads, different positions and different flow rates on the cooling characteristics and antifreeze characteristics of the cooling tower, and take into account its dynamic changes.

[0041] Preferably, in the cooling tower intelligent circulating water shunt antifreeze system, the intelligent control module is also used to predict the circulating water temperature according to the real-time circulating water temperature and ambient temperature, and to issue an antifreeze warning when the predicted circulating water temperature result is lower than a preset value.

[0042] It can be understood that the intelligent control module can establish a three-dimensional computing model of the cooling tower, and has a monitoring and diagnosis system for the status of the three-dimensional computing model, and based on the accurate prediction of the minimum water temperature, it can provide real-time antifreeze warning, providing a basis for intelligent antifreeze control.

[0043] This embodiment adopts a circulating water spray structure. During winter operation, the circulating water return water is not cooled by the cooling tower filler, but only by the circulating water spray system and the circulating water drainage bypass pipe; it can gradually adjust the spray water volume as the ambient temperature changes, thereby adjusting the circulating water temperature, controlling the circulating water temperature within a reasonable range, ensuring the condenser vacuum, and ensuring the economic operation of the unit, and has broad application prospects. This embodiment can produce the following technical effects: improve the efficiency of the steam turbine and generate energy-saving benefits; it has a 3D modeling integrated monitoring platform, through the three-dimensional modeling and simulation analysis of the cooling tower structure, determine the reasonable antifreeze spray process, and through monitoring the changes in the circulating water temperature and the ambient temperature and analyzing the relevant data, the intelligent control system realizes the intelligent antifreeze control of the cooling tower by controlling the opening degree of the shunt electric valve. Adapt to weather changes and power generation load adjustments, quickly adjust the electric valve, and keep the circulating water temperature within the optimal range. Replace the traditional manual hanging anti-cold board measures, save manpower, and improve safety. No need to disassemble in summer, does not affect normal cooling.

[0044] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0045] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0046] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0047] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0048] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0049] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0050] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0052] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A cooling tower intelligent circulating water diversion antifreeze system, characterized in that: include: The diversion pipeline in the tower, the diversion pipeline along the tower, the circulating water drainage bypass pipe and the intelligent control module; The branch pipeline in the tower includes a main pipeline and a plurality of branch pipelines connected to the main pipeline; the water inlet of the main pipeline is connected to the circulating water outlet main pipe; a first electric control valve is arranged at the water inlet of the main pipeline; and a plurality of jet ports are arranged on the branch pipeline; The tower-side shunt pipeline is connected to the main pipeline of the shunt pipeline in the tower, the tower-side shunt pipeline forms a loop along the outer edge of the cooling tower, and a plurality of jet ports are arranged on the tower-side shunt pipeline; The circulating water drainage bypass pipe is connected to the circulating water outlet main pipe and is used to divert the circulating water return water; a second electrically controlled valve is provided at the water inlet of the circulating water drainage bypass pipe; The intelligent control module is used to construct a three-dimensional calculation model of the cooling tower structure, obtain the circulating water temperature and the ambient temperature in real time, and control the opening degree of the first electrically controlled valve and the second electrically controlled valve according to the three-dimensional calculation model of the cooling tower structure, the circulating water temperature and the ambient temperature.

2. The cooling tower intelligent circulating water diversion antifreeze system according to claim 1 is characterized in that: The diameters of the main pipeline and the middle pipeline of the branch pipeline in the tower are gradually reduced to achieve branching and pressurized transportation.

3. The cooling tower intelligent circulating water diversion antifreeze system according to claim 1 is characterized in that: The branch pipelines of the branch pipeline in the tower are arranged under the secondary beam below the cooling tower filler bracket.

4. The cooling tower intelligent circulating water diversion antifreeze system according to claim 1 is characterized in that: Also includes: An environmental temperature sensor and a water temperature sensor arranged in the circulating water outlet main pipe; the environmental temperature sensor and the water temperature sensor are connected to the intelligent control module; The intelligent control module is used to monitor the ambient temperature in real time through the ambient temperature sensor, and the intelligent control module is used to monitor the circulating water temperature in real time through the water temperature sensor.

5. The cooling tower intelligent circulating water diversion antifreeze system according to claim 4 is characterized in that: The intelligent control module is also used to predict the circulating water temperature according to the real-time circulating water temperature and the ambient temperature, and to issue an antifreeze warning when the circulating water temperature prediction result is lower than a preset value.

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