Signal transmitter of spatially distributed multi-parameter electrostatic sensor

Abstract

This invention relates to a signal transmitter for a spatially distributed multi-parameter electrostatic sensor, comprising a first signal preprocessing circuit, a second signal preprocessing circuit, and a signal processing circuit. The first signal preprocessing circuit performs standard signal preprocessing and is used to multiplex signals from multiple sensors. The second signal preprocessing circuit includes N first signal amplification circuits, a signal superposition circuit, and a second signal amplification circuit. The first signal amplification circuits amplify the signals from each sensor, the signal superposition circuits superimpose the signals from multiple sensors, and the second signal amplification circuits amplify the superimposed signal. By using two different signal preprocessing processes, the appropriate preprocessing process can be selected according to different sensor signals, enabling reliable signal preprocessing.

Description

Technical Field

[0001] This invention relates to a signal transmitter for a spatially distributed multi-parameter electrostatic sensor. Background Technology

[0002] In thermal power plants, there has been a lack of accurate measurement methods for the flow state parameters of pulverized coal in the primary air ducts of coal-fired boilers. Current solutions involve using relatively simple signal processing circuits for signal data processing, such as signal amplification and filtering. However, this method cannot adapt to the actual conditions of the signal, resulting in low reliability. Summary of the Invention

[0003] This invention provides a signal transmitter for a spatially distributed multi-parameter electrostatic sensor to solve the technical problem of low reliability in existing signal processing.

[0004] The present invention adopts the following technical solution:

[0005] A signal transmitter for a spatially distributed multi-parameter electrostatic sensor includes a first signal preprocessing circuit, a second signal preprocessing circuit, and a signal processing circuit.

[0006] The first signal preprocessing circuit includes a signal multiplexing circuit, wherein the signal input terminal of the signal multiplexing circuit is used to connect to the signal output terminals of N sensors, where N is greater than or equal to 2.

[0007] The second signal preprocessing circuit includes N first signal amplification circuits, signal superposition circuits, and second signal amplification circuits. The signal input terminal of each first signal amplification circuit is used to connect to the signal output terminal of the corresponding sensor. The signal output terminal of each first signal amplification circuit is connected to the signal input terminal of the signal superposition circuit. The signal output terminal of the signal superposition circuit is connected to the signal input terminal of the second signal amplification circuit.

[0008] The signal processing circuit includes a signal filtering circuit and an AD conversion circuit. The signal output terminal of the signal multiplexing circuit and the signal output terminal of the second signal amplification circuit are connected to the signal input terminal of the signal filtering circuit, and the signal output terminal of the signal filtering circuit is connected to the signal input terminal of the AD conversion circuit.

[0009] Furthermore, the signal transmitter also includes a processor, and the signal output terminal of the AD conversion circuit is connected to the signal input terminal of the processor.

[0010] Furthermore, the signal transmitter also includes a signal modulation circuit, and the signal output terminal of the AD conversion circuit is connected to the signal input terminal of the processor through the signal modulation circuit.

[0011] Furthermore, the signal transmitter also includes a data transmission circuit, the signal output terminal of the processor is connected to the signal input terminal of the data transmission circuit, and the data transmission circuit is used to send data to the data center.

[0012] Furthermore, the data transmission circuit is an RS485 / 422 communication circuit.

[0013] The beneficial effects of this invention include: the signal transmitter of a spatially distributed multi-parameter electrostatic sensor provided by this invention includes two signal preprocessing circuits. The first signal preprocessing circuit includes a signal multiplexing circuit for multiplexing signals from multiple sensors. The first signal preprocessing circuit performs standard signal preprocessing. The second signal preprocessing circuit includes N first signal amplification circuits, a signal superposition circuit, and a second signal amplification circuit. The first signal amplification circuit amplifies the signals from each sensor, the signal superposition circuit superimposes the signals from multiple sensors, and the second signal amplification circuit amplifies the superimposed signal. Through these two different signal preprocessing processes, a suitable preprocessing process can be selected according to different sensor signals, enabling reliable signal preprocessing. Furthermore, the preprocessed signal is sequentially filtered and converted by an analog-to-digital converter, further ensuring reliable signal processing. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below:

[0015] Figure 1 This is a schematic diagram of the overall structure of a signal transmitter for a spatially distributed multi-parameter electrostatic sensor provided in an embodiment of this application;

[0016] Figure 2 This is a structural diagram of a signal transmitter for a spatially distributed multi-parameter electrostatic sensor provided in an embodiment of this application;

[0017] Figure 3 This is a circuit diagram of a part of the second signal preprocessing circuit;

[0018] Figure 4 This is a circuit diagram of another part of the second signal preprocessing circuit. Detailed Implementation

[0019] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0020] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0021] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0022] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0023] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0025] To illustrate the technical solution described in this application, specific embodiments will be described below.

[0026] The signal transmitter of the spatially distributed multi-parameter electrostatic sensor provided in this embodiment is applicable to the scenario of measuring the gas-solid two-phase flow parameters of pulverized coal in a coal duct. For example... Figure 1 As shown, four sensors are evenly arranged circumferentially inside the coal duct. These sensors can be flow velocity sensors used to detect the velocity of coal particles within the duct. Because the coal particles flow along the duct under air pressure, gravity and the duct's flow direction cause a higher concentration of coal particles in the lower right section and a lower concentration in the upper section of a certain cross-section within the duct. Using this spatially contained sensor to measure the charge distribution can yield relatively realistic and accurate measurement results. It should be understood that the number of sensors is not limited to the four mentioned above; the number can be N, where N is greater than or equal to 2. The specific value of N is determined by the actual application scenario; that is, the number of sensors is set according to actual needs.

[0027] This embodiment provides a signal transmitter based on a spatially distributed multi-parameter electrostatic sensor. It measures the flow parameters of the gas-solid two-phase flow of pulverized coal in a primary air-coal pipeline using the electrostatic capacitance method. Multiple sensors are used to measure the flow parameters of the gas-solid two-phase flow of primary air-coal.

[0028] The application scenarios of the signal transmitter of the spatially distributed multi-parameter electrostatic sensor provided in this embodiment are not limited. It can be: applicable to scenarios where the particle velocity in a two-phase flow (air-powder) pipeline is 5-70 m / s, and the measured data is particle velocity; applicable to scenarios where the charge intensity in a two-phase flow (air-powder) pipeline is 50mV-500mV, and the measured data is voltage; applicable to scenarios where the charge flow distribution state in a two-phase flow (air-powder) pipeline is measured, and the measured data is a flow distribution diagram; applicable to scenarios where the theoretical air-powder temperature in a two-phase flow (air-powder) pipeline is 50-150℃, where air-powder humidity has a certain impact on this applicable range, and temperature compensation is performed; the applicable air-powder humidity in a two-phase flow (air-powder) pipeline is related to the air-powder temperature.

[0029] like Figure 1 As shown in the figure, this embodiment provides a signal transmitter for a spatially distributed multi-parameter electrostatic sensor, including a first signal preprocessing circuit, a second signal preprocessing circuit, and a signal processing circuit. In this embodiment, the first signal preprocessing circuit is a standard preprocessing unit to achieve standard signal preprocessing, and the second signal preprocessing circuit is a high-precision preprocessing unit to achieve high-precision signal preprocessing.

[0030] like Figure 2As shown, the first signal preprocessing circuit includes a signal multiplexing circuit with N signal input terminals, each corresponding to a specific sensor. Each signal input terminal of the signal multiplexing circuit is connected to the signal output terminal of the corresponding sensor. The signal multiplexing circuit is a conventional multiplexed signal selection circuit used to multiplex the signals from N sensors, such as the multiplexed signal selection circuit structure disclosed in Chinese Utility Model Patent Publication No. CN212726987U. The first signal preprocessing circuit is used to perform multiplexing preprocessing on the sensor signals.

[0031] like Figure 2 As shown, the second signal preprocessing circuit includes N first signal amplification circuits, a signal superposition circuit, and a second signal amplification circuit. Each first signal amplification circuit corresponds one-to-one with a sensor, and the signal input terminal of each first signal amplification circuit is used to connect to the signal output terminal of the corresponding sensor. Figure 3 The diagram shown illustrates a specific embodiment of the first signal amplification circuit, which includes an amplifier and a filter circuit to amplify and filter the corresponding sensor signal. It should be understood that the first signal amplification circuit can also be other existing signal amplification circuits.

[0032] The signal output terminal of each first signal amplifier circuit is connected to the signal input terminal of the signal superposition circuit. The signal superposition circuit is used to superimpose the signals output by each first signal amplifier circuit. Figure 4 A circuit diagram of one specific implementation of the signal superposition circuit is provided. It should be understood that the signal superposition circuit can also be other existing signal superposition circuit structures.

[0033] The signal output terminal of the signal superposition circuit is connected to the signal input terminal of the second signal amplification circuit. The signal superimposed by the signal superposition circuit is then amplified again by the second signal amplification circuit. Figure 4 A circuit diagram of one specific implementation of the second signal amplifier circuit is provided. It should be understood that, similar to the first signal amplifier circuit, the second signal amplifier circuit can also be other existing signal amplifier circuits.

[0034] The signal processing circuit includes a signal filtering circuit and an analog-to-digital (A / D) conversion circuit. The signal filtering circuit can be a conventional filtering circuit. The A / D conversion circuit is used to convert analog signals into digital signals, and can be a conventional A / D conversion circuit or an A / D conversion chip.

[0035] The signal output terminal of the signal multiplexing circuit and the signal output terminal of the second signal amplification circuit are connected to the signal input terminal of the signal filtering circuit, and the signal output terminal of the signal filtering circuit is connected to the signal input terminal of the AD conversion circuit.

[0036] In this embodiment, the signal transmitter further includes a processor, and the signal output terminal of the AD conversion circuit is connected to the signal input terminal of the processor. The processor can be a conventional DSP digital signal processor; however, it should be understood that the processor can also be other processor chips, such as a microcontroller. Furthermore, to achieve signal modulation, the signal transmitter also includes a signal modulation circuit, and the signal output terminal of the AD conversion circuit is connected to the signal input terminal of the processor through the signal modulation circuit. The signal modulation circuit can be a conventional signal modulation circuit structure, such as a voltage level conversion circuit, which is used to modulate the signal according to a preset rule.

[0037] In this embodiment, the signal transmitter further includes a data transmission circuit. The signal output terminal of the processor is connected to the signal input terminal of the data transmission circuit. The data transmission circuit is used to send the data processed by the processor to the data center. The data transmission circuit can be a wired data transmission circuit or a wireless data transmission circuit. The wired data transmission circuit can be an RS485 / 422 communication circuit, and the wireless data transmission circuit can be a conventional wireless communication module.

[0038] Each sensor can be directly connected to either the first signal preprocessing circuit or the second signal preprocessing circuit as needed. In one specific embodiment, the signal transmitter also includes a selection circuit, which can be a selection switch. The selection switch includes a signal input terminal, a first signal output terminal, and a second signal output terminal. The signal input terminal of the selection switch is used to connect to the signal output terminals of each sensor. The first signal output terminal of the selection switch is connected to the signal input terminals of each signal multiplexing circuit, and the second signal output terminal of the selection switch is connected to the signal input terminals of each first signal amplification circuit.

[0039] A spatially distributed multi-parameter electrostatic sensor generates an AC passive electrostatic voltage signal. This signal is transmitted via a dedicated cable to either a standard or high-precision preprocessing unit, depending on the specific requirements. The requirement can be either manually set or determined by the following conditions: if the signal meets a preset standard measurement range, it is connected to the standard preprocessing unit; otherwise, if it does not meet the preset standard measurement range but does meet the high-precision measurement range, it is connected to the high-precision preprocessing unit. The standard preprocessing unit multiplexes the signal and transmits the multiplexed signal to the signal processing circuit via a pin header. The high-precision preprocessing unit filters and superimposes the multiple signals, then amplifies them according to a specified ratio as needed. The processed signal is then transmitted to the signal processing circuit via the pin header. The signal processing circuit filters the signal input from the preprocessing unit again and transmits it to the AD conversion circuit. The AD conversion circuit converts the analog signal into a digital signal, which is then modulated by a signal modulation circuit. The modulated signal is input to the processor, where it undergoes a preset calculation process to generate a data string containing air-powder flow parameters. This data, containing air-powder (two-phase flow) flow parameters, is then transmitted externally via an RS485 / 422 communication circuit.

[0040] It should be understood that the standard or high-precision preprocessing unit also includes the necessary power supply components to provide the required ±5VDC voltage for the entire system. The standard or high-precision preprocessing unit also includes necessary wiring components, including multi-point signal inputs from the spatially distributed multi-parameter electrostatic sensor, a 24VDC power supply input for the signal transmitter, two sets of RS485 / 422 communication circuits, and the processor's communication port.

[0041] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A signal transmitter for a spatially distributed multi-parameter electrostatic sensor, characterized in that, It includes a first signal preprocessing circuit, a second signal preprocessing circuit, and a signal processing circuit; The first signal preprocessing circuit includes a signal multiplexing circuit, wherein the signal input terminal of the signal multiplexing circuit is used to connect to the signal output terminals of N sensors, where N is greater than or equal to 2. The second signal preprocessing circuit includes N first signal amplification circuits, signal superposition circuits, and second signal amplification circuits. The signal input terminal of each first signal amplification circuit is used to connect to the signal output terminal of the corresponding sensor. The signal output terminal of each first signal amplification circuit is connected to the signal input terminal of the signal superposition circuit. The signal output terminal of the signal superposition circuit is connected to the signal input terminal of the second signal amplification circuit. The signal transmitter further includes a selection circuit, which includes a signal input terminal, a first signal output terminal, and a second signal output terminal. The signal input terminal of the selection circuit is used to connect to the signal output terminals of each sensor. The first signal output terminal of the selection circuit is connected to the signal input terminals of each signal multiplexing circuit. The second signal output terminal of the selection circuit is connected to the signal input terminals of each first signal amplification circuit. The selection circuit is used to enable each sensor to be connected to either a first signal preprocessing circuit or a second signal preprocessing circuit. The signal processing circuit includes a signal filtering circuit and an AD conversion circuit. The signal output terminal of the signal multiplexing circuit and the signal output terminal of the second signal amplification circuit are connected to the signal input terminal of the signal filtering circuit, and the signal output terminal of the signal filtering circuit is connected to the signal input terminal of the AD conversion circuit.

2. The signal transmitter of a spatially distributed multi-parameter electrostatic sensor according to claim 1, characterized in that, The signal transmitter also includes a processor, and the signal output terminal of the AD conversion circuit is connected to the signal input terminal of the processor.

3. The signal transmitter of a spatially distributed multi-parameter electrostatic sensor according to claim 2, characterized in that, The signal transmitter also includes a signal modulation circuit, and the signal output terminal of the AD conversion circuit is connected to the signal input terminal of the processor through the signal modulation circuit.

4. The signal transmitter of a spatially distributed multi-parameter electrostatic sensor according to claim 2, wherein, The signal transmitter also includes a data transmission circuit, and the signal output terminal of the processor is connected to the signal input terminal of the data transmission circuit. The data transmission circuit is used to send data to the data center.

5. The signal transmitter of a spatially distributed multi-parameter electrostatic sensor according to claim 4, characterized in that, The data transmission circuit is an RS485 / 422 communication circuit.

Images