Temperature measurement cable for indirect air cooling system, intelligent online temperature measurement system and method

Abstract

The present invention provides a temperature measurement cable, an intelligent online temperature measurement system and method for an indirect air cooling system, comprising: a temperature measurement unit for measuring temperature, which is respectively arranged at different positions on the return pipe side of the radiator; a temperature acquisition unit for acquiring the temperature signal of the temperature measurement unit; a signal conversion unit for converting the temperature signal acquired by the temperature acquisition unit; and a data processing unit for storing the temperature data converted by the signal conversion unit and analyzing, processing and alarming the temperature data. The present invention can prevent the radiator of the indirect air cooling system from being frozen, and improve the operating economy of the indirect air cooling system while ensuring safety; analyze and determine the tightness of the closing of the shutters of the indirect air cooling system; monitor the status of the radiator filling and draining process to prevent the valve from being stuck and causing water accumulation in the radiator and causing freezing; and has the function of optimizing and analyzing the operating performance of the indirect air cooling system; and can provide real-time data interaction for the optimized operation of the unit.

Description

[Technical field]

[0001] The present invention relates to the technical field of intelligent monitoring of indirect air cooling systems of thermal power plants, and in particular to a temperature measuring cable, an intelligent online temperature measuring system and a method for an indirect air cooling system. [Background technology]

[0002] The surface condenser indirect air cooling system consists of a surface condenser and a cooling tower. The radiator in the cooling tower is composed of a vertically arranged cooling triangle. A closed-loop cooling water system is used for water-air heat exchange. The radiator is opened by shutters to control the air flow rate, thereby achieving the effect of controlling the cooling of the radiator.

[0003] The surface condenser indirect air cooling system has the significant advantages of energy saving and consumption reduction. The medium in the radiator is water, and the radiator is made of aluminum tubes and aluminum fins, with a thin-walled multi-row tube staggered structure. Therefore, the radiator is prone to freezing and cracking during operation in cold areas in winter. Therefore, the radiator is monitored in all directions to avoid low-temperature freezing and cracking.

[0004] The temperature measurement cable with built-in digital temperature sensor is used for all-round monitoring of the radiator wall temperature. The data collected by the collector is transmitted to the intelligent host computer system via the bus to realize online temperature monitoring, analysis, control optimization, status evaluation, operation warning and system diagnosis of the radiator of the indirect air cooling system.

[0005] The existing temperature measurement systems or solutions cannot achieve all-round three-dimensional temperature monitoring, the temperature measurement components cannot be installed losslessly on the radiator, and do not have the functions of performance analysis and optimization.

[0006] Therefore, it is necessary to study temperature measurement cables, temperature measurement systems and temperature measurement methods for indirect air cooling systems to address the deficiencies of the prior art and to solve or alleviate one or more of the above problems. [Summary of the invention]

[0007] In view of this, the present invention provides a temperature measuring cable, an intelligent online temperature measuring system and a method for an indirect air cooling system. The present invention collects the temperature values ​​of multi-point digital temperature sensors in the temperature measuring cable, and connects the collected temperature signals to the upper intelligent control system through Modbus-RTU to an industrial Ethernet gateway, a photoelectric conversion module, a communication optical cable, etc., to achieve all-round temperature monitoring and analysis of the radiator of the indirect air cooling system.

[0008] The present invention provides a temperature measuring cable for an indirect air cooling system, the temperature measuring cable comprising:

[0009] Temperature sensor, used to obtain the surface temperature of the indirect air cooling system;

[0010] A signal transmission unit connected to the temperature sensor for transmitting temperature data;

[0011] A hardness reinforcement part, used to reinforce the hardness and tensile resistance of the cable;

[0012] A signal shielding layer, covering the temperature sensor, the signal transmission part and the hardness reinforcement part, is used to shield interference signals;

[0013] The protective layer is covered outside the signal shielding layer to enhance the insulation performance and protect the cable and temperature sensor from mechanical damage.

[0014] According to the above aspects and any possible implementation, an implementation is further provided, wherein the temperature measuring cable is further coated with a windproof fastener, the windproof fastener is provided with an accommodating space and a fixed opening, one end of the accommodating space is communicated with the fixed opening, and the other end opposite to the fixed opening is closed;

[0015] The temperature measuring cable is passed through the accommodating space;

[0016] The heat conducting plate is inserted into the fixed opening.

[0017] According to the aspects described above and any possible implementation, an implementation is further provided, wherein the signal shielding layer is a copper shielding layer, the signal transmission part is one or more copper conductors, and the hardness reinforcement part is one or more plastic-coated steel wire ropes.

[0018] According to the above aspects and any possible implementation, an intelligent online temperature measurement system for an indirect air cooling system is further provided, the intelligent online temperature measurement system comprising:

[0019] The temperature measuring cable is fixed to the heat conducting plate through windproof fasteners;

[0020] A communication unit, connected to the temperature measurement cable and transmitting temperature information;

[0021] A signal conversion unit, used for converting the temperature signal collected by the temperature collection unit;

[0022] The data processing unit is used to store the temperature data converted by the signal conversion unit and to analyze, process and alarm the temperature data.

[0023] According to the aspects described above and any possible implementation method, an implementation method is further provided, wherein the communication unit includes a collector and a vertical communication cable, one end of the vertical communication cable is connected to the temperature measurement cable through an injection-molded waterproof connector, and the other end is connected to the collector, and the collector is connected to the signal conversion unit. The collector communication interface is RS485A, B network redundant mode, and adopts Modbus-RTU communication protocol.

[0024] According to the above aspects and any possible implementation manner, an implementation manner is further provided, wherein the signal conversion unit includes:

[0025] Modbus-RTU to Industrial Ethernet Gateway, used to convert multiple RS485 serial ports into one Ethernet interface;

[0026] The photoelectric conversion module is used for mutual conversion of the photoelectric signals of the transmission medium and sends the converted electrical signals to the data processing unit.

[0027] According to the above aspects and any possible implementation, an implementation is further provided, wherein the intelligent online temperature measurement system further includes a display control unit, and the display control unit is connected to the data processing unit.

[0028] According to the above aspects and any possible implementation manner, an implementation manner is further provided, wherein the display control unit and the data processing unit are jointly arranged in a host computer.

[0029] According to the above aspects and any possible implementation, a temperature measurement method for an indirect air cooling system is further provided, comprising the temperature measurement system described in any of the above aspects, and the method specifically comprises the following steps:

[0030] S1: Pass the temperature measuring cable through the windproof fastener;

[0031] S2: Fasten the windproof fastener to the heat conducting plate, and place the temperature measuring cable close to the heat conducting plate;

[0032] S3: Arrange temperature measurement points at different temperature measurement intervals from both sides of the windward heat dissipation surface close to the louvers inward;

[0033] S4: Arrange temperature measuring cables vertically on both sides of the inside of the blinds;

[0034] S5: Divide the temperature measuring cable arranged on the radiator into sections according to the length of the heat dissipation surface, and connect each section of the temperature measuring cable to the vertical communication cable using a splitter.

[0035] According to the above aspects and any possible implementation manner, an implementation manner is further provided, wherein the method further includes:

[0036] S6: Based on the data results processed by the data processing unit, the display control unit is used to query, process, analyze and display the temperature data, and alarm for temperatures exceeding a preset threshold. The results of the temperature signal analysis and processing are sent to the indirect air cooling control system. The indirect air cooling control system completes the antifreeze protection action of the indirect air cooling based on the received analysis and processed data results.

[0037] Compared with the prior art, the present invention can achieve the following technical effects: the present invention can achieve the following technical effects: the lossless installation method of multi-point temperature measuring cables and the all-round three-dimensional arrangement can realize the multi-directional and three-dimensional temperature measurement of the radiator; provide a reliable means for the winter antifreeze and economical operation of indirect air cooling; through the temperature collection and analysis within the cooling triangle of the radiator, the evaluation and analysis of the tightness effect of the closing of the shutters can be realized; through the temperature collection and analysis of the radiator, the state monitoring of the radiator filling and draining process can be realized, and the performance analysis and optimization calculation of the indirect air cooling system can be realized; provide data support for the intelligent analysis and optimized operation of the unit.

[0038] Of course, any product implementing the present invention does not necessarily need to achieve all of the above-mentioned technical effects at the same time.

Brief Description of the Drawings

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 It is a design diagram of a temperature measuring cable provided by an embodiment of the present invention;

[0041] Figure 2 It is a design diagram of a temperature measuring cable provided by an embodiment of the present invention;

[0042] Figure 3 It is a structural diagram of a temperature measuring cable provided by an embodiment of the present invention;

[0043] Figure 4 is a schematic diagram of a rubber fastener provided by an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the installation of a temperature measuring cable provided by an embodiment of the present invention;

[0045] Figure 6 is a schematic diagram of installing a heat conducting plate provided by an embodiment of the present invention;

[0046] Figure 7 It is a cooling triangle temperature measurement point arrangement provided by an embodiment of the present invention;

[0047] Figure 8 It is a schematic diagram of an intelligent online temperature measurement system for a radiator of an indirect air cooling system provided by an embodiment of the present invention.

[0048] In the figure:

[0049] In the figure: 1. Temperature measurement cable; 2. Rubber fastener; 3. Collector; 4. Modbus-RTU to Industrial Ethernet gateway; 5. Photoelectric conversion module; 6. Photoelectric conversion module; 7. Host computer; 8. Radiator; 9. Reserved communication interface for the control system. [Specific implementation method]

[0050] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0051] It should be clear that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0053] like Figures 1 to 3 As shown, the embodiment of the present invention is a temperature measuring cable for an indirect air cooling system. The temperature measuring cable comprises:

[0054] Temperature sensor, used to obtain surface temperature;

[0055] A signal transmission unit connected to the temperature sensor for transmitting temperature data;

[0056] A hardness reinforcement part, used to reinforce the hardness and tensile resistance of the cable;

[0057] A signal shielding layer, covering the temperature sensor, the signal transmission part and the hardness reinforcement part, is used to shield interference signals;

[0058] The protective layer is covered outside the signal shielding layer to enhance the insulation performance and protect the cable and temperature sensor from mechanical damage.

[0059] The temperature measuring cable is also covered with a windproof fastener, and the windproof fastener is provided with an accommodating space and a fixed opening, one end of the accommodating space is connected to the fixed opening, and the other end opposite to the fixed opening is closed;

[0060] The temperature measuring cable is passed through the accommodating space;

[0061] The heat conducting plate is inserted into the fixed opening.

[0062] Fillers are also provided in the signal shielding layer, the signal transmission part is a copper conductor, and the hardness reinforcement part is a plastic-coated steel wire rope.

[0063] like Figure 6 and 8 As shown, an intelligent online temperature measurement system for an indirect air cooling system, the intelligent online temperature measurement system comprises:

[0064] The temperature measuring cable is fixed on the heat conducting plate through windproof fasteners;

[0065] A communication unit, connected to the temperature measurement cable and transmitting temperature information;

[0066] A signal conversion unit, used for converting the temperature signal collected by the temperature collection unit;

[0067] A data processing unit, used for storing the temperature data converted by the signal conversion unit and analyzing, processing and alarming the temperature data;

[0068] The communication unit includes a collector and a vertical communication cable. One end of the vertical communication cable is connected to the temperature measurement cable through an injection-molded waterproof connector, and the other end is connected to the collector. The collector is connected to the signal conversion unit. The collector communication interface is RS485A, B network redundant mode, and adopts Modbus-RTU communication protocol.

[0069] The signal conversion unit comprises:

[0070] Modbus-RTU to Industrial Ethernet Gateway, used to convert multiple RS485 serial ports into one Ethernet interface;

[0071] The photoelectric conversion module is used for mutual conversion of the photoelectric signals of the transmission medium, and sends the converted electrical signals to the data processing unit; the intelligent online temperature measurement system also includes a display control unit, which is used to query, process, analyze and display temperature data, and alarm for temperatures exceeding a preset threshold, and send the results of the temperature signal analysis and processing to the indirect air cooling control system. The indirect air cooling control system completes the antifreeze protection action of the indirect air cooling according to the data results received and analyzed;

[0072] The display control unit and the data processing unit are arranged together in the host computer.

[0073] A temperature measurement method for an indirect air cooling system based on the above temperature measurement system comprises the following steps:

[0074] S1: Pass the temperature measuring cable through the windproof fastener;

[0075] S2: Fasten the windproof fastener to the heat conducting plate and place the temperature measuring cable close to the heat conducting plate (see Figure 6 );

[0076] S3: Arrange temperature measurement points at different temperature measurement intervals from both sides of the windward heat dissipation surface close to the louvers inward;

[0077] S4: Arrange temperature measuring cables vertically on both sides of the inside of the blinds;

[0078] S5: Divide the temperature measuring cable arranged on the radiator into sections according to the length of the heat dissipation surface, and connect each section of the temperature measuring cable to the vertical communication cable using a splitter;

[0079] The method further comprises:

[0080] S6: According to the data results processed by the data processing unit, the display control unit is used to query, process, analyze and display the temperature data, and alarm when the temperature exceeds the preset threshold, and send the results of the temperature signal analysis and processing to the indirect air cooling control system. The indirect air cooling control system completes the antifreeze protection action of the indirect air cooling according to the received analysis and processed data results.

[0081] Example

[0082] like Figure 8 As shown, the temperature measuring cable 1 is arranged on the radiator 8 outside the radiator according to the established design and the characteristics of the process flow, and the temperature sensor is arranged in the temperature measuring cable 1 according to the design requirements; the collector 3 is used to collect the temperature signal of the temperature measuring cable 1; the Modbus-RTU to industrial Ethernet gateway 4 is used to convert multiple RS485 serial ports into an Ethernet interface; the photoelectric conversion modules 5 and 6 are used for the conversion of the transmission medium; the host computer 7 receives the input of the collector 3 and is used to display, store and analyze data. The whole system realizes multi-point and multi-directional temperature monitoring to prevent the radiator of the indirect air cooling system from freezing and improve the operating economy of the system; analyze and judge the tightness of the shutter closure of the indirect air cooling system; monitor the status of the radiator filling and draining process to prevent the valve from jamming and causing water accumulation in the radiator and freezing; and has the function of optimizing and analyzing the operating performance of the indirect air cooling system; and can provide real-time data interaction for the optimized operation of the unit.

[0083] like Figure 5 As shown, several temperature measuring cables are arranged at set intervals on the return side of the radiator. The temperature measuring cables are tightly attached to the radiator and a special rubber fastener 2 (such as Figure 4 As shown) as a method of fixing the temperature measurement cable and preventing interference from wind inlet. The whole system realizes multi-point and multi-directional temperature monitoring, providing a strong basis for winter antifreeze and economic operation of indirect air cooling. By collecting and analyzing the radiator temperature, the tightness of the shutter closing can be analyzed and evaluated; the state monitoring of the radiator filling and draining process can prevent the radiator from freezing due to water accumulation caused by valve jamming; it has the function of optimizing and analyzing the operating performance of the indirect air cooling system; and can provide data support for unit performance optimization.

[0084] A communication bus cable with steel wire and shielding layer is set in the middle of the indirect air-cooled radiator triangle. It is connected to the branch line in the form of a quick-connect splitter, and the radiator body is used as the heat transfer medium.

[0085] The temperature measuring cable is fixed and wind-proofed using a special rubber fastener. The temperature measuring points of the temperature measuring cable are distributed as follows: Figure 7 As shown, it can fully reflect the real-time monitoring of the freezing-prone position. During the water discharge and water filling process of the air-cooled radiator, the water level status can be analyzed and judged by the temperature change of the temperature measuring cable.

[0086] Temperature measuring cables are arranged vertically on both sides of the shutters to judge the tightness of the shutters and to analyze the performance of the indirect air cooling system through the temperature distribution.

[0087] like Figure 3 As shown, the temperature measuring cable 1 includes one or more copper conductors for transmitting signals, and one or more steel wires (coated steel wire ropes) are built in to enhance the tensile strength of the cable. The temperature measuring cable 1 also has a copper wire shielding layer built in, which is coated on the steel wire to enhance the anti-interference property of the cable. Cold-resistant materials are added to the outer sheath to meet the outdoor use conditions of the intelligent online temperature measurement system of the indirect air cooling system.

[0088] Each collector 3 is linked in a redundant RS485A and B network manner, and adopts the Modbus-RTU communication protocol; the Modbus-RTU to industrial Ethernet gateway 4 converts multiple RS485 serial ports into Ethernet interfaces, and then connects to the upper intelligent control system through optical fiber via the photoelectric conversion modules 5 and 6; the upper computer 7 receives the input signal of the collector, and the collected data is analyzed and collected through the temperature signals of various parts of the radiator, and the temperature of the radiator during operation is monitored and warned in real time to prevent the freezing of the radiator in the indirect air cooling system and improve the operating economy of the indirect air cooling system; through the temperature distribution at different positions inside the cooling triangle of the radiator, it has the function of analyzing the tightness of the closing of the shutters of the indirect air cooling system and issuing an early warning; through the temperature changes of different parts of the radiator, the function of real-time monitoring and early warning of the water filling and draining process can be completed; through the collected data and the system built-in calculation model, it has the function of analyzing and optimizing the operating performance of the indirect air cooling system; it has the function of providing real-time data interaction for unit operation optimization.

[0089] The above is a detailed introduction to the temperature measurement cable, temperature measurement system and temperature measurement method for the indirect air cooling system provided by the embodiments of the present application. The description of the above embodiments is only used to help understand the method and its core idea of ​​the present application; at the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

[0090] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different nouns to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. As mentioned throughout the specification and claims, "including" and "comprising" are open-ended terms, so they should be interpreted as "including / including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. The subsequent description of the specification is a preferred embodiment of the present application, but the description is for the purpose of illustrating the general principles of the present application, and is not used to limit the scope of the present application. The scope of protection of the present application shall be determined by the definition of the attached claims.

[0091] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0092] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0093] The above description shows and describes several preferred embodiments of the present application, but as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the application concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present application, and should be within the scope of protection of the claims attached to the present application.

Claims

1. An intelligent online temperature measurement system for an indirect air cooling system, characterized in that: It includes a temperature measuring cable, which is fixed in sections on the heat conducting plate of the radiator through windproof fasteners. The intelligent online temperature measuring system also includes: Communication unit, connected to the temperature measurement cable and transmitting temperature data; A signal conversion unit, used for converting the temperature signal collected by the temperature collection unit; A data processing unit, used for storing the temperature data converted by the signal conversion unit and analyzing, processing and alarming the temperature data; Among them, temperature measuring points are arranged inward at different temperature measuring intervals from both sides of the windward heat dissipation surface of the heat conducting plate close to the shutters, and the temperature measuring cable arranged on the radiator is divided into sections according to the length of the heat dissipation surface, and each section of the temperature measuring cable is connected to the vertical communication cable by a splitter; The data processing unit analyzes the tightness of the shutter closure of the indirect air cooling system and issues an early warning based on the temperature distribution at different positions inside the cooling triangle of the radiator, performs real-time monitoring and early warning of the water filling and draining process, and performs an indirect air cooling system operation performance analysis and optimization through the collected temperature data and the system built-in calculation model; The temperature measuring cable comprises: Temperature sensor, used to obtain the surface temperature of the indirect air cooling system; A signal transmission unit connected to the temperature sensor for transmitting temperature data; A hardness reinforcement part, used to reinforce the hardness and tensile resistance of the cable; A signal shielding layer, covering the temperature sensor, the signal transmission part and the hardness reinforcement part, is used to shield interference signals; The protective layer is wrapped around the signal shielding layer to enhance the insulation performance and protect the cable and temperature sensor from mechanical damage; The temperature measuring cable is also covered with the windproof fastener, and the windproof fastener is provided with an accommodating space and a fixed opening, one end of the accommodating space is connected to the fixed opening, and the other end opposite to the fixed opening is closed; Wherein, the temperature measuring cable is passed through the accommodating space, and the heat conducting plate is passed through the fixed opening.

2. The intelligent online temperature measurement system according to claim 1, characterized in that: The signal shielding layer is a copper shielding layer, the signal transmission part is one or more copper conductors, and the hardness reinforcement part is one or more plastic-coated steel wire ropes.

3. The intelligent online temperature measurement system according to claim 1, characterized in that: The communication unit includes a collector and a vertical communication cable. One end of the vertical communication cable is connected to the temperature measurement cable through an injection-molded waterproof connector, and the other end is connected to the collector. The collector is connected to the signal conversion unit. The collector communication interface is RS485 A, B network redundant mode, using Modbus-RTU communication protocol.

4. According to the intelligent online temperature measurement system of claim 1, the signal conversion unit comprises: Modbus-RTU to Industrial Ethernet Gateway, used to convert multiple RS485 serial ports to Ethernet interfaces; The photoelectric conversion module is used for mutual conversion of the photoelectric signals of the transmission medium and sends the converted electrical signals to the data processing unit.

5. The intelligent online temperature measurement system according to claim 1, characterized in that: The intelligent online temperature measurement system also includes a display control unit, which is connected to the data processing unit.

6. The intelligent online temperature measurement system according to claim 5, characterized in that: The display control unit and the data processing unit are arranged together in the host computer.

7. An intelligent online temperature measurement method for an indirect air cooling system, comprising the intelligent online temperature measurement system according to any one of claims 1 to 6, the method specifically comprising the following steps: S1: Pass the temperature measuring cable through the windproof fastener; S2: Fasten the windproof fastener to the heat conducting plate, and place the temperature measuring cable close to the heat conducting plate; S3: Arrange temperature measurement points at different temperature measurement intervals from both sides of the windward heat dissipation surface close to the louvers inward; S4: Arrange temperature measuring cables vertically on both sides of the inside of the blinds; S5: Divide the temperature measuring cable arranged on the radiator into sections according to the length of the heat dissipation surface, and connect each section of the temperature measuring cable to the vertical communication cable using a splitter.

8. The intelligent online temperature measurement method according to claim 7, characterized in that: The method further comprises: S6: Based on the data results processed by the data processing unit, the display control unit is used to query, process, analyze and display the temperature data, and alarm for temperatures exceeding a preset threshold. The results of the temperature signal analysis and processing are sent to the indirect air cooling control system. The indirect air cooling control system completes the antifreeze protection action of the indirect air cooling based on the received analysis and processed data results.

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