Power plant direct cooling tower line type multi-point temperature field monitoring and early warning system

Abstract

The utility model discloses a line-type multi-point temperature field monitoring and early warning system for a direct cooling tower of a power plant. The temperature of each temperature measuring point is monitored in real time through a temperature measuring cable; the field acquisition terminal acquires a temperature measurement cable signal, displays the temperature in real time, and transmits the temperature to the system host through LoRa wireless communication, the system host acquires, displays, records, stores, constructs a temperature field and outputs an alarm in real time, has temperature rise rate early warning and temperature over-limit early warning functions, and is linked with the temperature alarm system to give an alarm; and finally, the distributed control system is used for monitoring, managing and analyzing data to guarantee safe production.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature monitoring, in particular to a direct cooling tower line type multi-point temperature field monitoring and early warning system for a power plant. Background Art

[0002] Direct cooling tower, also known as direct air cooling tower, exhaust steam discharged from steam engines, steam turbines and other equipment is directly sent into the circular metal heat dissipation tubes in the cooling tower through pipes. The tubes are connected by heat dissipation fins and cooled into condensate by fans. No condenser is required, so it is called direct air cooling.

[0003] Direct air cooling technology encounters some problems in the operation of domestic power plants, such as high back pressure in summer, high antifreeze pressure in winter, unreasonable fan operation mode, lack of basis for back pressure setting, etc. Direct air cooling condensers are arranged outdoors. When operating in cold winter, especially during the start-up and shutdown process of the unit, and deep peak regulation or low-load operation at night when the steam turbine exhaust volume is small, the temperature field of the air cooling island radiator is prone to unevenness, which can easily cause local freezing, resulting in abnormalities or shutdown of the unit, causing serious economic losses to the enterprise.

[0004] During the operation of the direct cooling tower, the temperature of the air-cooling island radiator composed of heat pipes needs to be monitored. At present, the existing temperature measurement point data of the air-cooling system cannot fully reflect the temperature status of the air-cooling island. In order to prevent the radiator from freezing, the operating plant generally adopts the operation mode of increasing the back pressure of the unit, which greatly reduces the operation economy of the generator set. Utility Model Content

[0005] In view of the defects in the prior art, the utility model provides a direct-cooling tower line multi-point temperature field monitoring and early warning system for a power plant. The system can comprehensively monitor the temperature of the heat dissipation tube bundle in real time, reduce the inspection efforts of operating personnel, ensure the safe and reliable operation of the unit in winter, and realize closed-loop control of the air-cooling fan. Under the premise of ensuring that the radiator does not freeze, the back pressure of the unit is reduced, thereby realizing safe and economical operation of the unit.

[0006] A power plant direct cooling tower line multi-point temperature field monitoring and early warning system, including temperature measurement cables, field acquisition terminals, system host, distributed control system and temperature alarm system; wherein,

[0007] The temperature measuring cable extends in a pulsed manner and is distributed on the heat dissipation surface formed by the heat dissipation pipe. The temperature measuring cable has a plurality of temperature measuring elements distributed at intervals along the extension direction, and the temperature measuring elements are in contact with the outer surface of the heat dissipation pipe.

[0008] The field acquisition terminal is connected to the temperature measurement cable in electrical signal connection, and the field acquisition terminal is connected to the system host in communication;

[0009] The distributed control system and the temperature alarm system are both connected to the system host.

[0010] Furthermore, the on-site acquisition terminal is connected to the system host through a wireless communication module.

[0011] Furthermore, the wireless communication module is a LoRa module.

[0012] Furthermore, the surface of the heat dissipation pipe is coated with weather-resistant thermally conductive silica gel, and the temperature measuring element is adhered to the weather-resistant thermally conductive silica gel.

[0013] Furthermore, a layer of high-temperature glass fiber aluminum foil is pasted on the outside of the temperature measuring element.

[0014] Furthermore, the high temperature glass fiber aluminum foil is bonded by weather-resistant silicone.

[0015] Furthermore, the temperature measuring elements are located on the rising edge and the falling edge of the pulse-shaped extension line, and the distance between two adjacent temperature measuring elements is 1000 mm.

[0016] Furthermore, the length of the pulse unit of the pulse-shaped extension line formed by the temperature measuring cable is 2050 mm.

[0017] The beneficial effects of the utility model are embodied in:

[0018] The utility model adopts a direct cooling tower line multi-point temperature field monitoring and early warning system for power plants to monitor the temperature of each temperature measuring point in real time through a temperature measuring cable; the on-site acquisition terminal acquires the temperature measuring cable signal, displays the temperature in real time, and transmits it to the system host through LoRa wireless communication. The system host acquires, displays, records, stores, constructs the temperature field, and outputs alarms in real time, and has the functions of temperature rise rate early warning and temperature over-limit early warning, and links the temperature alarm system to alarm; finally, the distributed control system is used to monitor, manage and analyze data to ensure safe production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0020] The accompanying drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. For ordinary technicians in this field, other accompanying drawings can also be obtained based on these accompanying drawings without paying creative labor.

[0021] Figure 1A result schematic diagram of a power plant direct cooling tower line multi-point temperature field monitoring and early warning system provided by an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of the wiring structure of the temperature measuring cable provided in the embodiment of the utility model;

[0023] Figure 3 A schematic diagram of the installation structure of the temperature measuring element provided in the embodiment of the utility model;

[0024] The realization of the purpose, functional features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. The above-mentioned drawings have shown clear embodiments of this application, which will be described in more detail later. These drawings and textual descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0025] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0026] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0029] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] like Figure 1 As shown, the utility model provides a power plant direct cooling tower line type multi-point temperature field monitoring and early warning system, including a temperature measuring cable 1, a field acquisition terminal 2, a system host 3, a distributed control system 4 and a temperature alarm system 5.

[0032] Among them, Figure 2 As shown, the temperature measuring cable 1 extends in a pulsed manner and is distributed on the heat dissipation surface formed by the heat dissipation pipe. The temperature measuring cable 1 has a plurality of temperature measuring elements 6 spaced apart along the extension direction, and the temperature measuring elements 6 are in contact with the outer surface of the heat dissipation pipe.

[0033] In this embodiment, the temperature measuring cable 1 adopts HSM (Hot Spot Monitor) linear multi-point temperature detector, which is a linear temperature measuring cable using a digital temperature sensor integrated chip, which can collect the temperature of the detection point in real time and construct a temperature field. Figure 2 As shown, two temperature measuring cables 1 are arranged in parallel, the length of the pulse unit of the pulse-shaped extension line formed by the temperature measuring cable 1 is 2050 mm, the temperature measuring element 6 is located on the rising edge and the falling edge of the pulse-shaped extension line, and the distance between two adjacent temperature measuring elements 6 is 1000 mm.

[0034] Specifically, Figure 3As shown, the surface of the heat pipe is coated with weather-resistant thermal conductive silicone 8, and the temperature measuring element 6 is adhered to the weather-resistant thermal conductive silicone 8. The weather-resistant thermal conductive silicone 8 is used for heat conduction to ensure that the temperature measuring element is closely attached to the surface of the heat pipe, reduce the loss during heat conduction, improve the temperature measurement sensitivity and accuracy, and ensure a firm and reliable connection. In addition, a layer of high-temperature glass fiber aluminum foil 7 is adhered to the outside of the temperature measuring element 6 to prevent the temperature measuring element 6 from being disturbed by the external temperature environment, prevent dust and running water from invading, and improve the temperature measurement accuracy and service life of the temperature measuring element 6. The high-temperature glass fiber aluminum foil 7 can be adhered by weather-resistant silicone to prevent the aluminum foil from falling off due to the influence of the high temperature environment.

[0035] In this embodiment, the field acquisition terminal 2 is connected to the temperature measuring cable 1 by electrical signals, and the field acquisition terminal 2 is connected to the system host by communication. The field acquisition terminal 2 is used to collect the temperature measuring cable 1 signal in real time, obtain the temperature data and temperature change amplitude on the heat dissipation surface in real time according to the temperature measuring cable 1 signal, and send the temperature data and temperature change amplitude to the system host 3. The field acquisition terminal 2 can use a control device such as a single-chip microcomputer, DSP, ARM or PLC. Specifically, the field acquisition terminal 2 is connected to the system host 3 by communication through a wireless communication module. The wireless communication module uses a LoRa module.

[0036] The distributed control system 4 and the temperature alarm system 5 are both connected to the system host 3. The system host 3 collects, displays, records, stores, and outputs alarms in real time, and has the functions of temperature rise rate warning and temperature over-limit warning, and links the temperature alarm system 5 to alarm. The distributed control system 4 is used to monitor, manage, and analyze data to ensure safe production. In this embodiment, the distributed control system 4 and the temperature alarm system 5 can both adopt existing technologies, and the embodiments will not be repeated.

[0037] Finally, it should be noted that the various technical features of the technical solution of the present application can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present application.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the scope of the claims and specification of the present invention.

Claims

1. A multi-point temperature field monitoring and early warning system for direct cooling tower lines in power plants, characterized in that: It comprises a temperature measuring cable (1), a field acquisition terminal (2), a system host (3), a distributed control system (4) and a temperature alarm system (5); wherein: The temperature measuring cable (1) extends in a pulsed manner and is distributed on the heat dissipation surface formed by the heat dissipation pipe. The temperature measuring cable (1) has a plurality of temperature measuring elements (6) distributed at intervals along the extension direction. The temperature measuring elements (6) are in contact with the outer surface of the heat dissipation pipe. The field acquisition terminal (2) is electrically connected to the temperature measuring cable (1), and the field acquisition terminal (2) is communicatively connected to the system host; The distributed control system (4) and the temperature alarm system (5) are both connected to the system host (3).

2. A power plant direct cooling tower line multi-point temperature field monitoring and early warning system according to claim 1, characterized in that: The on-site acquisition terminal (2) is communicatively connected to the system host (3) via a wireless communication module.

3. A power plant direct cooling tower line multi-point temperature field monitoring and early warning system according to claim 2, characterized in that: The wireless communication module is a LoRa module.

4. A power plant direct cooling tower line multi-point temperature field monitoring and early warning system according to claim 1, characterized in that: The surface of the heat dissipation pipe is coated with weather-resistant thermally conductive silica gel (8), and the temperature measuring element (6) is adhered to the weather-resistant thermally conductive silica gel (8).

5. According to claim 1, a power plant direct cooling tower line multi-point temperature field monitoring and early warning system is characterized by: A layer of high-temperature glass fiber aluminum foil (7) is adhered to the outside of the temperature measuring element (6).

6. A power plant direct cooling tower line multi-point temperature field monitoring and early warning system according to claim 5, characterized in that: The high-temperature glass fiber aluminum foil (7) is bonded by weather-resistant silica gel.

7. A power plant direct cooling tower line multi-point temperature field monitoring and early warning system according to claim 1, characterized in that: The temperature measuring elements (6) are located on the rising edge and the falling edge of the pulse-shaped extension line, and the distance between two adjacent temperature measuring elements (6) is 1000 mm.

8. The power plant direct cooling tower line multi-point temperature field monitoring and early warning system according to claim 1 is characterized by: The length of the pulse unit of the pulse-shaped extended line formed by the temperature measuring cable (1) is 2050 mm.

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