A flow field measurement device and a flow field measurement system

Abstract

The embodiment of the present application provides a flow field measurement device and a flow field measurement system, the device includes: an acquisition module, which is used to sense the information to be collected in the flow field and convert the sensed information to be collected into an electrical signal; a wireless transmission module, including a wireless data transmission module, a single-chip microcomputer and an antenna system; the wireless data transmission module is connected to the acquisition module to obtain the electrical signal and transmit it to the antenna system; the single-chip microcomputer is connected to the antenna system to control the antenna system to establish a point-to-point data transmission connection with the target device; the antenna system sends an electrical signal to the target device. This realizes wireless transmission from the acquisition module to the target device, so there is no need to arrange the line between the flow field measurement device and the target device, thereby reducing the wiring difficulty. At the same time, since a point-to-point transmission method is established between the flow field measurement device and the target device, when a transmission failure occurs, the faulty communication link can be easily located by querying the fault information, thereby reducing the maintenance cost.

Description

Technical Field

[0001] The present application relates to the technical field of flow field measurement, and in particular to a flow field measurement device and a flow field measurement system. Background Art

[0002] At present, in scenarios such as thermal power plants, flue gas flow velocity measurement mainly uses measuring equipment such as Pitot tubes and hot wire anemometers to collect flow velocity, and then transmits the measured flow velocity signal to the control system (such as DCS (Distributed Control System), PLC (Programmable Logic Controller)) through wired transmission to realize data exchange.

[0003] However, the velocity measurement realized by such wired transmission methods often faces practical problems such as long transmission distance, complex field conditions, and difficulty in wiring in actual industrial production sites, which makes the implementation of the solution inconvenient. In addition, there are many devices (often various devices such as velocity measurement equipment, temperature measurement equipment, and pressure measurement equipment) and complex lines at industrial production sites. When there is a line failure, the maintenance cost is huge. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a flow field measurement device and a flow field measurement system to solve the problems of difficult wiring and high maintenance costs in the existing methods.

[0005] An embodiment of the present application provides a flow field measurement device, including: an acquisition module, used to sense information to be collected in the flow field, and convert the sensed information to be collected into an electrical signal; a wireless transmission module, including a wireless data transmission module, a single-chip microcomputer and an antenna system; the wireless data transmission module is connected to the acquisition module to obtain the electrical signal and transmit it to the antenna system; the single-chip microcomputer is connected to the antenna system to control the antenna system to establish a point-to-point data transmission connection with a target device; the antenna system sends the electrical signal to the target device.

[0006] In the above implementation structure, the acquisition module is used to collect the information to be collected in the flow field, and converts it into an electrical signal and outputs it to the wireless data transmission module, and then the electrical signal is transmitted to the antenna system through the wireless data transmission module, and the antenna system realizes a point-to-point transmission connection with the target device (such as a control system or a transfer device before the control system) on the control line of the single-chip microcomputer, so that the electrical signal converted from the collected flow field information can be sent to the target device by wireless transmission. In this way, the acquisition module can be set in the flow field, and the target device can be set at the industrial production site, which realizes wireless transmission from the acquisition module to the target device, so that there is no need to arrange the line between the flow field measurement device and the target device, thereby reducing the wiring difficulty. At the same time, since a point-to-point transmission method is established between the flow field measurement device and the target device, when a transmission failure occurs, the faulty communication link can be easily located by querying the fault information, thereby reducing the maintenance cost.

[0007] Furthermore, the acquisition module includes a Pitot tube, a thermocouple, a pressure sensor and a first signal transmission interface; the Pitot tube and the thermocouple are integrated together; one end of the pressure sensor is connected to the Pitot tube to convert the flow rate information sensed by the Pitot tube into an electrical signal; the other end of the pressure sensor and the thermocouple are connected to the first signal transmission interface to output the electrical signal transmitted by the pressure sensor and the thermocouple.

[0008] In the above implementation structure, the flow velocity and temperature in the flow field can be detected by integrating the pitot tube and the thermocouple. By connecting the pressure sensor to the pitot tube, the flow velocity information sensed by the pitot tube can be converted into an electrical signal through the pressure generated, thereby realizing the electrical signal conversion of the flow velocity information and realizing the reliable collection of the flow field information.

[0009] Furthermore, the acquisition module also includes: a signal amplification circuit, connected to the first signal transmission interface to receive and amplify the electrical signal; an analog-to-digital converter, connected to the signal amplification circuit to convert the amplified electrical signal from an analog signal to a digital signal; a second signal transmission interface, connected to the analog-to-digital converter to receive the signal output by the analog-to-digital converter and output it to the wireless transmission module.

[0010] In actual applications, the electrical signals collected by the Pitot tube and the thermocouple are usually very weak. Therefore, in the above-mentioned implementation structure, the signal is amplified and converted into analog-to-digital, so that the electrical signal output to the wireless transmission module can meet the requirements of wireless transmission, thereby ensuring the reliability of wireless communication.

[0011] Furthermore, the first signal transmission interface and the second signal transmission interface are plug-in wiring interfaces.

[0012] In the above implementation structure, by adopting a plug-in wiring interface, the two parts of the acquisition module and the separation between the acquisition module and the wireless transmission module can be achieved, so that the flow field measurement device provided by the present application can be more flexibly applied to various practical scenarios.

[0013] In an embodiment of the present application, a flow field measurement system is also provided, comprising: a plurality of flow field measurement devices of any of the aforementioned types, respectively arranged in each device to be measured; and a control system, wirelessly connected to the flow field measurement device to receive flow field measurement information detected by the flow field measurement device.

[0014] Through the flow field measurement system provided by the embodiment of the present application, multiple flow field measurement devices are arranged in each device to be tested, thereby realizing information detection of each device to be tested, and then transmitting the detected flow field measurement information to the control system. In this way, at the industrial production site, there is no need to arrange the line between the flow field measurement device and the control system, thereby reducing the wiring difficulty of the industrial production site. At the same time, since the flow field measurement device adopts a point-to-point transmission method, when a transmission failure occurs, the faulty communication link can be easily located by querying the fault information, thereby reducing the maintenance cost.

[0015] Furthermore, the device to be tested includes the device to be tested; at least one group of flow field measurement devices is arranged inside the device to be tested along the direction of the smoke; the group of flow field measurement devices includes multiple flow field measurement devices, and the multiple flow field measurement devices in the same group of flow field measurement devices are located on the same cross-section inside the device to be tested along the direction of the smoke.

[0016] In the above implementation process, at least one group of flow field measurement devices is arranged inside the equipment to be tested along the flue gas direction, and each group of flow field measurement devices includes multiple flow field measurement devices, and are arranged on the same section. This allows multiple flow field measurement devices to be used to reliably collect flow field information at the same position during measurement, thereby improving the accuracy and reliability of the data output to the control system.

[0017] Furthermore, the system also includes a relay server; the relay server is wirelessly connected to each of the flow field measurement devices to receive flow field measurement information transmitted by each of the flow field measurement devices, and is connected to the control system to forward the flow field measurement information to the control system.

[0018] In practical applications, industrial production sites are often large, and the distances between different devices to be tested are often not very close. Therefore, if the flow field measurement device is directly connected to the control system, then depending on the location of the control system, some flow field measurement devices may not transmit signals well, resulting in problems such as transmission interruption. To this end, by setting up a relay server, it is possible to ensure that the signal from the flow field measurement device to the control system is effectively transmitted, thereby ensuring the reliability of the solution of the embodiment of the present application.

[0019] Furthermore, the flow field measurement device group has a basic flow field measurement device; among the flow field measurement devices in the same group of flow field measurement devices, adjacent flow field measurement devices transmit their respectively collected flow field measurement information through a point-to-point unidirectional communication link, so as to gather the flow field measurement information collected by all the flow field measurement devices in the flow field measurement device group to the basic flow field measurement device; the basic flow field measurement device is wirelessly connected to the relay server corresponding to the flow field measurement device group.

[0020] In the above implementation structure, the flow field measurement information can be aggregated and transmitted through point-to-point one-way communication. Since only point-to-point one-way communication needs to be established, the performance requirements of the wireless transmission module in each flow field measurement device can be greatly reduced, thereby saving the cost of the flow field measurement device.

[0021] Furthermore, the basic flow field measuring devices of different groups of flow field measuring devices are wirelessly connected to different relay servers.

[0022] In the above implementation structure, each group of flow field measurement devices corresponds to a dedicated relay server, thereby ensuring reliable and rapid forwarding of data for each group of flow field measurement devices, thereby improving the information flow efficiency and reliability of the entire flow field measurement system.

[0023] Furthermore, multiple groups of flow field measurement devices are arranged at different positions along the smoke direction inside the equipment to be tested; the relay server is wirelessly connected to the basic flow field measurement devices of at least two groups of flow field measurement devices among the multiple groups of flow field measurement devices; the relay server establishes wireless communication connections with each of the basic flow field measurement devices in turn according to a preset sampling frequency.

[0024] In the above implementation structure, a relay server is connected to multiple groups of flow field measurement devices, and establishes wireless communication connections with each of the basic flow field measurement devices in turn according to the predicted sampling frequency, so as to obtain flow field detection information between the corresponding flow field measurement device groups, thereby making full use of the performance of the relay server and reducing the deployment cost of the entire flow field measurement system.

[0025] Furthermore, when any flow field measuring device within the group of flow field measuring devices finds that the flow field measurement information deviation between it and an adjacent flow field measuring device is greater than a preset deviation requirement, it generates an alarm message and collects it to the basic flow field measuring device, so that the basic flow field measuring device can send the alarm message to the control system through the relay server.

[0026] In actual application, the fluid passing through the same cross section in the direction of the flue gas may have certain differences at different positions due to factors such as the internal interaction of the fluid, resulting in certain differences in the flow field detection information detected by different flow field measurement devices. However, this difference between two adjacent flow field measurement devices should be within a certain range because their layout positions are relatively close. Therefore, in the above-mentioned implementation structure, when it is found that the deviation of the flow field measurement information between the adjacent flow field measurement devices is greater than the preset deviation requirement, an alarm information is generated and collected at the basic flow field measurement device, so that a timely alarm for abnormal flow field conditions can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structure of a flow field measurement system provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of the structure of another flow field measurement system provided in an embodiment of the present application;

[0030] Figure 3 A schematic diagram of the structure of a flow field measurement device provided in an embodiment of the present application;

[0031] Figure 4 A schematic diagram of the structure of a perception module provided in an embodiment of the present application;

[0032] Figure 5 A schematic diagram of the structure of a data processing module provided in an embodiment of the present application;

[0033] Figure 6 A more specific structural diagram of a data processing module provided in an embodiment of the present application;

[0034] Figure 7 A schematic diagram of a network topology and communication link of a boiler flow field measurement device provided in an embodiment of the present application;

[0035] Figure 8 A schematic structural diagram of a specific flow field measurement device provided in an embodiment of the present application;

[0036] Fig. 9 A schematic diagram of the structure of a flow field measurement system applicable to a thermal power plant provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0038] Embodiment 1:

[0039] In order to reduce the difficulty of wiring in actual industrial production sites and reduce maintenance costs, a flow field measurement system and a flow field measurement device used in the system are provided in an embodiment of the present application.

[0040] See also Figure 1 As shown, the flow field measurement system provided in the embodiment of the present application includes:

[0041] A plurality of flow field measuring devices are respectively arranged in each device to be tested.

[0042] The control system is wirelessly connected to each flow field measuring device to receive flow field measurement information detected by each flow field measuring device.

[0043] It should be noted that in actual applications, industrial production sites are often large, and the distances between different devices to be tested are often not very close. Therefore, if the flow field measurement device is directly connected to the control system, then depending on the location of the control system, some flow field measurement devices may not transmit signals well, resulting in transmission interruption and other problems. For this reason, in the embodiments of this application, see Figure 2 As shown, a relay server can be set between the flow field measuring device and the control system, so as to utilize the relay server to wirelessly connect with each flow field measuring device, and connect the relay server to the control system (it can be a wired communication connection or a wireless communication connection), so as to utilize the relay server to forward the signal to ensure the effective transmission of the signal from the flow field measuring device to the control system.

[0044] In the embodiment of the present application, the control system can be implemented using DCS, PLC, etc.

[0045] In the embodiment of the present application, the structure of the flow field measurement device can be seen in Figure 3 As shown, it includes: a collection module and a wireless transmission module.

[0046] The acquisition module is used to sense the information to be collected in the flow field and convert the sensed information to be collected into electrical signals.

[0047] The wireless transmission module includes a wireless data transmission module, a single-chip microcomputer and an antenna system.

[0048] The wireless data transmission module is connected to the acquisition module to obtain electrical signals and transmit them to the antenna system. The single-chip microcomputer is connected to the antenna system to control the antenna system to establish a point-to-point data transmission connection with the target device. The antenna system sends electrical signals to the target device.

[0049] In the embodiment of the present application, the target device refers to a device that establishes a point-to-point wireless communication connection with the flow field measurement device and the flow field measurement system. Figure 1 The middle is the control system, Figure 2 The relay server is in the middle.

[0050] It should be noted that, in the embodiments of the present application, the specific structure of the acquisition module should be related to the flow field information that needs to be collected and the actual application scenario.

[0051] For example, if applied to a thermal power plant, a Pitot tube may be used to collect flow velocity, and a thermocouple may be used to collect temperature.

[0052] At this time, you can refer to Figure 4 As shown, the acquisition module may include a sensing module, which includes a pitot tube 1, a thermocouple 2, a pressure sensor 3 and a first signal transmission interface 4. The pitot tube 1 and the thermocouple 2 are integrated together, and one end of the pressure sensor 3 is connected to the pitot tube 1 to convert the flow velocity information sensed by the pitot tube 1 into an electrical signal. The other end of the pressure sensor 3 and the thermocouple 2 are connected to the first signal transmission interface 4 to output the electrical signal representing the flow velocity of the flow field transmitted by the pressure sensor and the electrical signal representing the flow field temperature transmitted by the thermocouple.

[0053] It should be understood that if only flow rate information needs to be collected, the sensing module may not integrate the thermocouple 2. Similarly, if only temperature information needs to be collected, the sensing module may not integrate the Pitot tube 1 and the pressure sensor 3. The specific configuration structure may be configured as required.

[0054] It should be understood that Figure 4 The structure shown in FIG. 1 is not suitable for wireless transmission because the electrical signals output by the pressure sensor 3 and the thermocouple 2 are often very weak. Figure 5 As shown, after the sensing module, there may be a data processing module, which may include: a signal amplification circuit, an analog-to-digital converter and a second signal transmission interface.

[0055] The signal amplification circuit is connected to the first signal transmission interface to receive the electrical signal transmitted by the sensing module and amplify and condition it to increase its resolution and sensitivity. The analog-to-digital converter is connected to the signal amplification circuit to receive the amplified electrical signal, perform analog-to-digital conversion on it, and convert the amplified electrical signal from an analog signal to a digital signal, so as to facilitate processing by the wireless transmission module. The second signal transmission interface is connected to the analog-to-digital converter to receive the signal output by the analog-to-digital converter and output it to the wireless transmission module.

[0056] It should be noted that in the embodiments of the present application, the signal amplification circuit can be implemented using various existing signal amplification circuits, which is not limited in the embodiments of the present application.

[0057] In the examples of this application, see Figure 6 As shown, the data processing module may also have a digital-to-analog converter to receive the signal sent back by the control system and convert it into analog information to output to the perception module to realize the functions of zero calibration, error detection, cleaning, etc. of the perception module.

[0058] In addition, in the embodiment of the present application, a transformer may be provided in the data processing module, and the transformer is connected to the industrial frequency power supply circuit, so as to convert the 220V voltage into a 12V working voltage, so as to power the analog-to-digital converter, the digital-to-analog converter, the pressure sensor and other devices. It should be understood that in the embodiment of the present application, power supply may also be achieved by providing a battery or the like, and the power supply method is not limited in the embodiment of the present application.

[0059] In the embodiment of the present application, the first signal transmission interface and the second signal transmission interface can be plug-in wiring interfaces. In this way, the perception module, the data processing module and the wireless transmission module can be freely split and merged, so as to adapt to a richer range of scenarios. For example, when the user wants to use a wired connection, he only needs to remove the wireless transmission module and replace it with a communication connection line that matches the second signal transmission interface.

[0060] In addition, in the embodiments of the present application, the sensing module, the data processing module and the wireless transmission module can be independently configured with a shell, for example, using corrosion-resistant stainless steel material to adapt to the actual flue gas environment of high temperature, high dust and high corrosion. The shell is fixedly connected by fixing parts such as threads to ensure the stable position of the circuit therein.

[0061] It should be understood that in the embodiment of the present application, the sensing module, the data processing module and the wireless transmission module can be highly integrated to limit the maximum diameter of the shells of the three modules to within 10 cm, thereby meeting most on-site application conditions.

[0062] It should also be noted that the above is an example of a feasible structure of an acquisition module provided in the embodiment of the present application. In actual application, depending on the actual test scene, for example, in a scene without smoke, corrosion, and relatively stable temperature, a hot wire anemometer can also be used as an acquisition module. In addition, if the test scene is a scene without smoke, corrosion, and relatively stable temperature, and the engineer has high requirements for measurement accuracy, high-precision acquisition equipment such as a laser Doppler flow meter and a particle imager can also be used as an acquisition module.

[0063] In the embodiment of the present application, the wireless data transmission module can be implemented using an industrial-grade wireless data transmission module, which together with a single-chip microcomputer and an antenna system can constitute a miniature data transmission radio station.

[0064] In the embodiment of the present application, the single chip microcomputer can adopt an ST single chip microcomputer, in which a transceiver communication program is configured to control the point-to-point data transmission connection between the antenna system and the target device.

[0065] In the embodiment of the present application, functions such as data encryption and data compression can also be set in the single chip microcomputer to improve the security of data transmission and reduce the amount of data transmission.

[0066] In an embodiment of the present application, the antenna system may be configured to support an open 433-525 MHz frequency band to send electrical signals to a target device via a microwave communication link.

[0067] It should be noted that in the embodiment of the present application, the device to be tested in the flow field measurement system refers to the device that needs to perform information measurement in the flow field. For example, for a thermal power plant, the device to be tested includes but is not limited to one or more of boilers, air preheaters, denitrification reactors, low-temperature economizers, and other equipment.

[0068] In the embodiment of the present application, one or more flow field measurement devices can be set in each device to be tested according to actual needs. In order to achieve better measurement results, in the embodiment of the present application, multiple flow field measurement devices can be configured into a flow field measurement device group, and each flow field measurement device in a flow field measurement device group is arranged on the same cross section along the smoke direction inside the device to be tested, so that more detailed and reliable flow field measurement information (i.e., the information to be collected in the flow field converted into electrical signals as described above) of the flow field at the same cross-sectional position can be measured by multiple flow field measurement devices.

[0069] Exemplarily, assuming that the equipment to be tested includes a boiler, at least one group of flow field measurement devices can be arranged inside the boiler along the flue gas direction, and each flow field measurement device in each flow field measurement device group can be arranged on the same cross-section inside the boiler along the flue gas direction.

[0070] In order to reduce data transmission costs, in an embodiment of the present application, one flow field measurement device in each group of flow field measurement devices can be set as a basic flow field measurement device, and the basic flow field measurement device can be connected to the target device through point-to-point wireless communication.

[0071] In each flow field measurement device within the same group of flow field measurement devices, adjacent flow field measurement devices transmit their respectively collected flow field measurement information through a point-to-point unidirectional communication link, thereby aggregating the flow field measurement information collected by all the flow field measurement devices in the flow field measurement device group to the basic flow field measurement device, so that the basic flow field measurement device sends all the flow field measurement information collected by the flow field measurement device group to the target device.

[0072] For example, see Figure 7 As shown, it is assumed that N groups of flow field measurement devices are arranged in the boiler, which are respectively denoted as a-1, a-2, ..., aN, and each group of flow field measurement devices is located on different cross sections in the flue gas direction in the boiler. Each flow field measurement device group has M flow field measurement devices, and each flow field measurement device is denoted as (an, m), where an belongs to a-1 to aN, and m belongs to 1 to M. Let (an, 1) be the basic flow field measurement device in each flow field measurement device group, then (an, M) transmits the collected flow field measurement information to (an, M-1), (an, M-1) transmits the collected flow field measurement information and the flow field measurement information collected by (an, M) to (an, M-2) ..., (an, 1) collects the M flow field measurement information collected by the M flow field measurement devices (an, M) to (an, 1), and then (an, 1) sends it to the connected relay server.

[0073] It should be noted that in the embodiments of the present application, Figure 7 As shown, one relay server is connected to the basic flow field measuring devices of multiple flow field measuring device groups at the same time, so as to obtain the flow field measurement information of the multiple flow field measuring device groups.

[0074] In actual applications, the flow field measurement system does not have high requirements for the timeliness of data. Therefore, in an embodiment of the present application, the relay server establishes a wireless communication connection with each basic flow field measurement device in turn according to the predicted sampling frequency.

[0075] For example, for Figure 7In the structure shown, the relay server can first establish a point-to-point wireless communication connection with (a-1, 1), thereby obtaining all flow field measurement information from (a-1, 1) to (a-1, M) from (a-1, 1), and then establish a point-to-point wireless communication connection with (a-2, 1) when the sampling frequency arrives, thereby obtaining all flow field measurement information from (a-2, 1) to (a-2, M) from (a-2, 1), and so on. After obtaining all flow field measurement information from (an, 1) to (an, M) from (an, 1), when the sampling frequency arrives, re-establish a point-to-point wireless communication connection with (a-1, 1), thereby obtaining all flow field measurement information from (a-1, 1) to (a-1, M) from (a-1, 1). This process is repeated repeatedly to achieve the acquisition of flow field measurement information for each flow field measurement device group.

[0076] It should be noted that the sampling frequency can be customized by engineers to meet the actual data acquisition needs.

[0077] In addition, in the embodiment of the present application, a dedicated relay server may be configured for each of the different flow field measurement device groups, thereby ensuring data transmission efficiency.

[0078] In addition, in the embodiment of the present application, the flow field measurement system may have an alarm function. In actual application, the fluid passing through the same cross section in the direction of the smoke may have certain differences at different positions due to factors such as the internal interaction of the fluid, resulting in certain differences in the flow field detection information detected by different flow field measurement devices. However, this difference between two adjacent flow field measurement devices should be within a certain range because their layout positions are relatively close.

[0079] Therefore, in an embodiment of the present application, a comparison circuit can be set in the group flow field measurement device, so that when any flow field measurement device in the group flow field measurement device finds that the flow field measurement information deviation between it and the adjacent flow field measurement device is greater than the preset deviation requirement, an alarm information can be generated and collected to the basic flow field measurement device, so that the basic flow field measurement device can send the alarm information to the control system through the relay server.

[0080] In an embodiment of the present application, the preset deviation requirement can be set by an engineer according to actual needs, for example, it can be set to 20%. When it is found that the flow field measurement information deviation between the adjacent flow field measurement device is greater than 20%, an alarm message is generated.

[0081] It should be noted that, in practical applications, the velocity, temperature and other flow field measurement information of the flue gas of the upstream device under test will affect the operating conditions of the downstream device under test. Therefore, in a feasible implementation of the embodiment of the present application, when there are multiple devices under test, at least one corresponding relay server can be configured for each device under test, and each relay server can establish a unidirectional wireless communication link along the direction of flue gas flow, and the relay server corresponding to the upstream device under test will send the acquired flow field measurement information of the upstream device under test to the relay server corresponding to the downstream device under test, thereby realizing the information integration of the downstream device under test on the upstream device under test at the relay server level.

[0082] It should be noted that, in the embodiment of the present application, the control system may include a server cluster and a control terminal. The relay server may realize data transmission to the server cluster in a wired or wireless manner.

[0083] In addition, in the embodiment of the present application, a private communication base station can also be configured. The radiation range of the private communication base station can be set by the engineer according to actual needs (for example, it can be set to ≤1km). When the mobile terminal enters the radiation range of the private communication base station, it can access the server cluster by logging in to the account and password authentication, thereby realizing access control of the mobile terminal.

[0084] In order to ensure the security of the control system, a network firewall can be set up between the private communication base station and the server cluster to filter out dangerous information.

[0085] Through the flow field measurement system and flow field measurement device provided by the embodiment of the present application, multiple flow field measurement devices are arranged in each device to be tested, thereby realizing information detection of each device to be tested, and then transmitting the detected flow field measurement information to the control system through wireless transmission. In this way, at the industrial production site, there is no need to arrange the line between the flow field measurement device and the control system, thereby reducing the wiring difficulty of the industrial production site. At the same time, because the flow field measurement device adopts a point-to-point transmission method, when a transmission failure occurs, the faulty communication link can be easily located by querying the fault information, thereby reducing the maintenance cost.

[0086] Embodiment 2:

[0087] The embodiment of the present application is based on the first embodiment and takes a specific flow field measurement device and system structure applied in a thermal power plant as an example for illustration.

[0088] See also Figure 8 As shown, Figure 8 A schematic structural diagram of a flow field measurement device provided in an embodiment of the present application, comprising: a sensing module (one), a data processing module (two) and a wireless transmission module (three).

[0089] The shells of the three modules are made of corrosion-resistant stainless steel to adapt to the actual flue gas environment of high temperature, high dust and high corrosion; the shells of the three modules are fixedly connected by threads. The three modules are connected by plug-in terminals to achieve information exchange and power supply. Among them, the maximum diameter d of the flow field measurement device composed of the three modules is less than or equal to 10cm to meet most on-site application conditions.

[0090] See also Figure 8 As shown, the sensing module (I) includes a Pitot tube 1, a thermocouple 2, a pressure sensor 3 and a first plug-in terminal 4. Among them, the Pitot tube 1, the thermocouple 2 and the shell of the sensing module are integrated together by spot welding to increase stability. One end of the pressure sensor 3 is connected to the Pitot tube 1 to convert the flow velocity information sensed by the Pitot tube 1 into an electrical signal. The other end of the pressure sensor 3 and the thermocouple 2 are connected to the first signal transmission interface 4 to output the electrical signal representing the flow field velocity transmitted by the pressure sensor 3 and the flow field temperature transmitted by the thermocouple 2. During use, the Pitot tube 1 directly enters the flue gas environment, and the length L of the Pitot tube 1 can be customized by the engineer according to actual needs to meet the best measurement effect.

[0091] The data processing module (II) comprises a power supply unit 5, an integrated circuit board 6 with a simple data analysis function, and a second plug-in terminal 7. The power supply unit 5 is realized by connecting a transformer with an industrial frequency power supply circuit to convert a 220V voltage into a 12V working voltage.

[0092] The integrated circuit board 6 mainly includes a signal amplifying circuit, an analog-to-digital converter and a digital-to-analog converter.

[0093] Because the voltage or current signal transmitted by the sensing module (one) is weak and easily interfered, the voltage or current signal transmitted by the sensing module (one) is first amplified by the signal amplification circuit to increase its resolution and sensitivity. The amplified signal is then converted into a digital signal through a dual-channel 24-bit analog-to-digital converter, and the digital signal is transmitted to the wireless transmission module (three) through the second plug-in terminal 7. At the same time, the module can also convert the electrical signal transmitted by the wireless transmission module (three) into an analog signal through a dual-channel 24-bit digital-to-analog converter, and transmit it to the sensing module (one) to complete the functions of zero calibration, error detection, cleaning, etc.

[0094] The wireless transmission module (three) is mainly composed of an industrial-grade wireless data transmission module 8, a single-chip microcomputer (not shown in the figure) and an antenna system 9. The wireless data transmission module 8, the single-chip microcomputer and the antenna system 9 can be regarded as a miniature data transmission radio station. In the embodiment of the present application, based on the Si4432 radio frequency wireless solution, the GFSK modulation method can be adopted, and the transceiver communication program can be stored in the single-chip microcomputer to realize point-to-point real-time two-way high-speed wireless data transmission under different data packet lengths. In the embodiment of the present application, the power supply voltage of the wireless transmission module (three) can be 12V, and the antenna system 9 is configured to support the opening of the 433-525MHz frequency band, the maximum release of 36 channels, the effective transmission distance of 2Km, and the single-machine power is less than 5W. At the same time, according to business needs, data encryption and compression functions can be configured in the single-chip microcomputer.

[0095] The wireless transmission module (3) transmits the electrical signal transmitted by the data processing module (2) through the antenna system in the form of a microwave communication link, and establishes an uplink and downlink bidirectional link channel between the control system and the flow field measurement device. The antenna system uses wireless digital microwaves in the frequency band of 433 to 525 MHz.

[0096] It should be noted that, in the embodiment of the present application, the flow field measuring device is an in-situ flow field measuring device, that is, a device that performs measurement at the original location of the flow field.

[0097] See also Fig. 9 As shown, Fig. 9 A schematic diagram of the structure of a flow field measurement system applicable to a thermal power plant provided in an embodiment of the present application.

[0098] In fact, in a thermal power plant, there are a huge number of flow field measurement devices involved in the same equipment unit and different equipment units along the flue gas flow direction ((a) - boiler; (b) - air preheater; (c) - denitrification reactor; (d) - low-temperature economizer). They are independent of each other, far apart, and distributed in clusters. Given that the number of communication links of flow field measurement devices with wireless transmission functions is limited, the networking method between the various devices in the system adopts a three-layer architecture of equipment, transmission, and application.

[0099] The third equipment layer is mainly a data acquisition machine group composed of a large number of flow field measurement devices facing the real flue gas environment.

[0100] For example, in an actual boiler (a), N groups of flow field measurement devices are provided along the flue gas direction, which are respectively denoted as a-1, a-2, ..., aN, and each group of flow field measurement devices is located on a different section in the flue gas direction of the boiler.

[0101] The network topology and communication link arrangement of the flow field measurement device in the boiler (a) can be found in Figure 7 As shown. Figure 7It can be seen that along the flue gas cross section, two adjacent flow field measurement devices establish a point-to-point unidirectional communication link, and transmit the flow field measurement information to the adjacent flow field measurement device through the communication link. The flow field measurement device packages the flow field measurement information of the previous level and its own flow field measurement information and sends them to the next level flow field measurement device. Finally, the flow field measurement information at the same cross section is collected at the basic flow field measurement device. The basic flow field measurement device summarizes all the flow field measurement information of the cross section and uploads it to the relay server through a bidirectional link.

[0102] Since the flow field measurement system does not have high requirements for data timeliness, in order to avoid congestion in the communication link, the relay server and the basic flow field measurement devices on different sections along the flue gas flow direction establish connections in turn according to the custom sampling frequency to collect data from a single basic flow field measurement device.

[0103] At the same time, when any flow field measuring device finds that the velocity or temperature fluctuation between itself and the upper level flow field measuring device exceeds 20%, an alarm message is generated and summarized to the basic flow field measuring device, and then reported to the control system to realize an alarm.

[0104] The second transmission layer is mainly composed of relay servers that provide signal relay and forwarding services. According to the actual situation on site (whether there is any obstruction between devices, the distance of transmission, etc.), the relay server can be designed as a multi-level structure.

[0105] In order to reduce the amount of data interaction and the computing burden of equipment, a unidirectional wireless communication link is established between different relay servers along the direction of flue gas flow. The upstream relay server sends the acquired flue gas velocity, temperature and other data to the downstream relay server for adjustment by downstream equipment (such as air preheater, denitrification reactor, low-temperature economizer).

[0106] A two-way communication link is established between the relay server and the flow field measurement device through a wireless microwave link. In order to facilitate long-distance data transmission, the relay server and the server cluster establish a communication link through a wired connection. The relay server can transmit flow field measurement information to the server cluster in real time, and can also transmit the control signal of the server cluster to the flow field measurement device.

[0107] The first application layer is mainly composed of the server cluster and network firewall that constitute the control system, the private communication base station that provides mobile terminal access, and the control terminal.

[0108] The radiation range of the private communication base station is ≤1km. When a mobile terminal enters the radiation range of the private communication base station, it can access the data of the server cluster through the account and password authentication service of the mobile terminal. A network firewall is set between the private communication base station and the server cluster to improve system security.

[0109] The solution of this embodiment improves the reliability of the system and reduces the wiring and maintenance costs by establishing wireless communication between the flow field measurement device and the control system. In addition, through signal access, communication between devices (mobile terminal-flow field measurement device, mobile terminal-control system) can be realized. It can realize that multiple terminals (mobile terminal, control terminal) are simultaneously connected to the flow field measurement device to obtain flow field measurement information in real time. It can realize large-scale simultaneous access of distributed flow field measurement devices to improve measurement accuracy.

[0110] In the embodiments provided in this application, it should be understood that the disclosed structure can be implemented in other ways. The structural embodiments described above are only illustrative.

[0111] Furthermore, in this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity, but do not necessarily require or imply any such actual relationship or order between these entities.

[0112] In the embodiments of the present application, a plurality refers to two or more than two.

[0113] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A flow field measurement system, It is characterized in that include: Multiple flow field measurement devices are respectively arranged in each device to be tested; a control system, wirelessly connected to the flow field measuring device to receive flow field measurement information detected by the flow field measuring device; At least one set of flow field measurement devices is arranged inside the equipment to be tested along the direction of smoke; The flow field measurement device group includes a plurality of flow field measurement devices, and the plurality of flow field measurement devices in the same flow field measurement device group are located on the same cross section along the smoke direction inside the device to be tested; The system also includes a relay server; The relay server is wirelessly connected to each of the flow field measuring devices to receive flow field measurement information transmitted by each of the flow field measuring devices, and is connected to the control system; Each of the devices under test corresponds to at least one relay server, and each of the relay servers establishes a unidirectional wireless communication link along the direction of smoke flow. The relay server corresponding to the upstream device under test sends the acquired flow field measurement information of the upstream device under test to the relay server corresponding to the downstream device under test, and the relay server corresponding to the most downstream device under test forwards the acquired flow field measurement information to the control system; the upstream device under test is the device under test located upstream in the direction of smoke flow, and the downstream device under test is the device under test located downstream in the direction of smoke flow; Wherein, the flow field measuring device comprises: A collection module, used for sensing the information to be collected in the flow field and converting the sensed information to be collected into an electrical signal; Wireless transmission module, including wireless data transmission module, single chip microcomputer and antenna system; The wireless data transmission module is connected to the acquisition module to acquire the electrical signal and transmit it to the antenna system; The single chip microcomputer is connected to the antenna system to control the antenna system to establish a point-to-point data transmission connection with a target device; The antenna system transmits the electrical signal to the target device.

2. The flow field measurement system according to claim 1, It is characterized in that The flow field measurement device group comprises a basic flow field measurement device; In each of the flow field measurement devices in the same group of flow field measurement devices, adjacent flow field measurement devices transmit the flow field measurement information collected by each of them through a point-to-point unidirectional communication link, so as to gather the flow field measurement information collected by each of the flow field measurement devices in the flow field measurement device group to the basic flow field measurement device; The basic flow field measurement device is wirelessly connected to a relay server corresponding to the flow field measurement device group.

3. The flow field measurement system according to claim 1, It is characterized in that A plurality of groups of flow field measurement devices are arranged at different positions along the smoke direction inside the equipment to be tested; The relay server is wirelessly connected to basic flow field measurement devices of at least two groups of flow field measurement devices in the plurality of groups of flow field measurement devices; The relay server establishes wireless communication connections with each of the basic flow field measurement devices in sequence according to the predicted sampling frequency.

4. The flow field measurement system according to claim 1, It is characterized in that Any flow field measuring device in the group of flow field measuring devices generates alarm information when it finds that the flow field measurement information deviation between it and the adjacent flow field measuring device is greater than the preset deviation requirement, and collects it to the basic flow field measuring device, so that the basic flow field measuring device can send the alarm information to the control system through the relay server.

5. The flow field measurement system according to claim 1, It is characterized in that The acquisition module includes a Pitot tube, a thermocouple, a pressure sensor and a first signal transmission interface; The Pitot tube and the thermocouple are integrated together; One end of the pressure sensor is connected to the Pitot tube to convert the flow rate information sensed by the Pitot tube into an electrical signal; The other end of the pressure sensor and the thermocouple are connected to the first signal transmission interface to output the electrical signals transmitted by the pressure sensor and the thermocouple.

6. The flow field measurement system according to claim 5, It is characterized in that The acquisition module also includes: a signal amplifying circuit, connected to the first signal transmission interface, to receive and amplify the electrical signal; an analog-to-digital converter, connected to the signal amplifying circuit, to convert the amplified electrical signal from an analog signal to a digital signal; The second signal transmission interface is connected to the analog-to-digital converter to receive the signal output by the analog-to-digital converter and output it to the wireless transmission module.

7. The flow field measurement system according to claim 6, It is characterized in that The first signal transmission interface and the second signal transmission interface are plug-in wiring interfaces.

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