CN216081613U - Oxygen high-pressure micro-flow differential pressure sensor and automatic adjustment closed-loop control system - Google Patents
Oxygen high-pressure micro-flow differential pressure sensor and automatic adjustment closed-loop control system Download PDFInfo
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- CN216081613U CN216081613U CN202220260482.4U CN202220260482U CN216081613U CN 216081613 U CN216081613 U CN 216081613U CN 202220260482 U CN202220260482 U CN 202220260482U CN 216081613 U CN216081613 U CN 216081613U
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Abstract
The utility model relates to a gas flow differential pressure sensor, in particular to an oxygen high-pressure micro-flow differential pressure sensor and an automatic regulation closed-loop control system. The oxygen high-pressure micro-flow differential pressure sensor comprises an oxygen flow pipeline and a throttle plate which is arranged in the oxygen flow pipeline along the oxygen flow pipeline in the radial direction; a first pressure measuring point and a second pressure measuring point are arranged on the oxygen flow pipeline; the first pressure measuring point and the second pressure measuring point are respectively positioned at the front side and the rear side of the throttle plate; the throttle plate is provided with micropores with radial section area smaller than that of the oxygen circulation pipeline along the axial direction of the oxygen circulation pipeline. The automatic regulation closed-loop control system comprises an electromagnetic regulating valve, an oxygen high-pressure micro-flow differential pressure sensor, a differential pressure transmitter and a PLC (programmable logic controller). The method solves the problems that the control precision is low, the maintenance workload is large, and a sensor is easy to damage in the method for controlling the oxygen flow by the gas mass flow controller in the prior method for controlling the oxygen flow by the open-loop electromagnetic regulation valve.
Description
Technical Field
The utility model relates to a gas flow differential pressure sensor and an application system thereof, in particular to an oxygen high-pressure micro-flow differential pressure sensor suitable for an automatic oxygen adding device of a power plant boiler and an automatic regulation closed-loop control system based on the flow differential pressure sensor.
Background
In the anticorrosion treatment process of the power plant boiler, an oxygenation treatment process is adopted, so that a protective film can be formed on the surface of the boiler, and an anticorrosion effect is achieved. However, the process has high precision requirement on oxygen flow, the oxygen adding flow is extremely small, the flow is only dozens of milliliters per minute, and the working pressure is high and is 4-5 MPa. The current fluid flow sensor is suitable for measuring the flow of a large fluid, so that no corresponding product or technology can be directly applied to the oxygenation treatment process of the power plant boiler. If the amount of the added oxygen is not enough, the requirement of expected corrosion prevention cannot be met; if the oxygen addition is too large, more serious damage to the boiler will occur. At present, the oxygen flow in the oxygen adding treatment process of the power plant boiler is generally controlled by the following two ways:
1. controlling the oxygen flow through an open-loop electromagnetic regulating valve: the opening degree of the open-loop electromagnetic regulating valve is adjusted by detecting whether the oxygen concentration of the thermodynamic system reaches the standard or not, so that the oxygen flow control is realized. Because the thermodynamic system is a large hysteresis system, the PLC is not easy to adjust too fast, so that the oxygen addition amount cannot be adjusted rapidly, and the precision requirement of the thermodynamic system on the oxygen addition control cannot be met; meanwhile, the operation time without faults is short, and the maintenance workload is large.
2. Oxygen flow was controlled by gas mass flow controller: the gas mass flow controller can realize high-precision control, is generally used for microelectronic production, has high requirements on the use environment, and is easy to block and damage a gas pipe for detecting the gas flow when applied to the oxygen adding treatment process of a power plant boiler.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an oxygen high-pressure micro-flow differential pressure sensor and an automatic regulation closed-loop control system, which are used for solving the problems that the control precision is low, the maintenance workload is large, and the sensor is easy to damage and the like in the method for controlling the oxygen flow by a gas mass flow controller in the prior art by controlling the oxygen flow by an open-loop electromagnetic regulation valve.
The technical scheme of the utility model is to provide an oxygen high-pressure micro-flow differential pressure sensor, which is characterized in that: the device is used for monitoring the flow of high-pressure trace oxygen in the automatic oxygen adding device of the power plant boiler, the pressure range of high pressure can be 4-5 MPa and can also be higher than the pressure range, and the flow of the trace oxygen can be dozens of milliliters per minute or even smaller.
The oxygen high-pressure micro-flow differential pressure sensor comprises an oxygen flow pipeline and a throttle plate which is arranged in the oxygen flow pipeline along the oxygen flow pipeline in the radial direction;
the oxygen circulation pipeline is used for being connected in series with a pipeline to be measured, and a first pressure measuring point and a second pressure measuring point are arranged on the oxygen circulation pipeline; the first pressure measuring point and the second pressure measuring point are respectively positioned at the front side and the rear side of the throttle plate; defining that oxygen firstly flows through the front side of the throttle plate and then flows through the rear side of the throttle plate;
the throttle plate is provided with micropores along the axial direction of the oxygen circulation pipeline, and the ratio of the diameter of the oxygen circulation pipeline to the pore diameter of the micropores is more than or equal to 3.
Further, in order to obtain more accurate oxygen flow rate data, the axial center line of the micro-holes coincides with the axial center line of the oxygen flow conduit.
Furthermore, for the convenience of processing and installation, the oxygen circulation pipeline is a circular pipe, and the micropores are circular holes.
Further, the pore diameter of the micro-pores is not less than 0.1mm and not more than 1mm, and the ratio of the diameter of the oxygen gas flow channel to the pore diameter of the micro-pores is not less than 5.
Further, the throttle plate is located in the middle of the oxygen flow pipe.
Further, a ratio of a length of the oxygen gas flow passage to a thickness of the throttle plate is 20 or more.
The utility model also provides an automatic adjustment closed-loop control system, which is characterized in that: the device is used for adjusting the flow of high-pressure trace oxygen in the automatic oxygen adding device of the power plant boiler; comprises an electromagnetic regulating valve, the oxygen high-pressure micro-flow differential pressure sensor, a differential pressure transmitter and a PLC controller;
the electromagnetic regulating valve is arranged on a pipeline of the automatic oxygen adding device of the power plant boiler;
the oxygen high-pressure micro-flow differential pressure sensor is connected in series with a pipeline at the rear end of the electromagnetic regulating valve;
two acquisition ends of the differential pressure transmitter are respectively connected with a first pressure measurement point and a second pressure measurement point in the oxygen high-pressure micro-flow differential pressure sensor;
the signal input end of the PLC is connected with the signal output end of the differential pressure transmitter, and the signal output end of the PLC is connected with the signal input end of the electromagnetic regulating valve.
The utility model has the beneficial effects that:
1. the utility model arranges a throttle plate in an oxygen flow pipeline, arranges a micropore with a pore diameter smaller than the inner diameter of the pipeline on the throttle plate, and arranges a pressure measuring point on each of the front and back sides of the throttle plate on the oxygen flow pipeline, so that the oxygen can generate obvious pressure difference at the inlet and outlet of the micropore when passing through the micropore with small pore diameter, and the pressure difference is related to the oxygen flow, and the oxygen flow can be indirectly obtained by collecting the pressure difference of the two pressure measuring points. The obvious pressure difference data is converted into flow information, the precision is high, and the blank of the automatic boiler oxygenation device is filled; meanwhile, the sensor has the advantages of simple structure, lower manufacturing cost, small maintenance workload, difficult damage and the like.
2. The utility model further limits the ratio of the diameter of the oxygen flow pipeline to the aperture of the micropore, and can be suitable for controlling the oxygen flow in the environment with smaller flow and higher pressure.
3. The utility model realizes closed-loop control based on an oxygen flow automatic regulation closed-loop control system, oxygen firstly passes through an electromagnetic regulating valve arranged in a pipeline and then enters an oxygen high-pressure micro-flow differential pressure sensor to generate a differential pressure signal related to the oxygen flow, the differential pressure sensor provides a corresponding signal for a PLC (programmable logic controller) according to the magnitude of the differential pressure signal, the PLC obtains the oxygen flow through calculation, and then controls the opening of the electromagnetic regulating valve to control the oxygen adding amount of an oxygen adding device. The oxygen flow can be adjusted in real time through the process, and the accurate adjustment of the oxygen flow is realized.
Drawings
FIG. 1 is a schematic structural diagram of an oxygen high-pressure micro-flow differential pressure sensor in an embodiment;
FIG. 2 is a schematic diagram of an embodiment of a closed-loop control system for automatically adjusting oxygen flow;
the reference numbers in the figures are:
1-oxygen circulation pipeline, 2-throttle plate, 3-first pressure measuring point, 4-second pressure measuring point and 5-micropore.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention and the scope of the present invention is therefore not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the utility model. The appearances of the phrase "in other embodiments" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Furthermore, the present invention is described in detail with reference to the schematic drawings, and in the detailed description of the embodiments of the present invention, the schematic drawings showing the device structure are only examples for convenience of illustration, and should not limit the scope of the present invention herein. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Meanwhile, in the description of the present invention, it should be noted that the terms "front side and rear side" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first and second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the oxygen high-pressure micro-flow differential pressure sensor of the present embodiment is mainly composed of an oxygen flow pipe 1 and a throttle plate 2, and as can be seen from the figure, the throttle plate 2 of the present embodiment is disposed inside the oxygen flow pipe 1 along the radial direction of the oxygen flow pipe 1, and is located at the middle part of the oxygen flow pipe 1, and in other embodiments, the throttle plate 2 may be located at any position of the oxygen flow pipe 1, such as a position close to an input port or an output port. For convenience of processing and installation, the oxygen circulation pipeline 1 in the embodiment adopts a circular pipe with a circular cross section, the throttle plate 2 is provided with micropores 5 with the diameter far smaller than that of the oxygen circulation pipeline 1, and the axial center lines of the micropores 5 coincide with the axial center line of the oxygen circulation pipeline 1. In this embodiment, the aperture of the micro-hole 5 is not less than 0.1mm and not more than 1mm, the ratio of the diameter of the oxygen gas flow pipe 1 to the aperture of the micro-hole 5 is not less than 5, and the ratio of the length of the oxygen gas flow pipe 1 to the thickness of the throttle plate 2 is not less than 20. In other embodiments, a pipe having a polygonal shape such as a rectangular cross section may be selected as the oxygen flow pipe 1 as long as the ratio of the diameter of the oxygen flow pipe 1 to the pore diameter of the micropores 5 is not less than 3. As can also be seen from the figure, in the present embodiment, a first pressure measuring point 3 and a second pressure measuring point 4 are arranged on the oxygen gas circulation pipeline 1, and the first pressure measuring point 3 and the second pressure measuring point 4 are respectively located at the front side and the rear side of the throttle plate 2; it is defined that oxygen flows first through the front side of the throttle plate 2 and then through the rear side of the throttle plate 2. The direction of the arrows in the figure is the oxygen flow direction, and when oxygen passes through the micropores 5 with small pore size, a significant pressure difference is generated at the inlet and the outlet of the micropores 5, and the pressure difference is related to the oxygen flow, namely, the following conditions are satisfied: Δ P ∞ Q, where Δ P is the pressure difference before and after oxygen gas passes through the micropores 5 and Q is the oxygen gas flow rate. The oxygen flow can be obtained by collecting the pressure at the two pressure measurement point contacts. The ratio of the diameter of the oxygen flow pipeline 1 to the aperture of the micropore 5 is larger than or equal to 5, if the ratio of the diameter to the aperture of the micropore 5 is too large, the dynamic range of the oxygen flow which can be measured is small, and if the ratio of the diameter to the aperture of the micropore is too small, the pressure difference which is generated is too small, the signal-to-noise ratio is not high, and the small-flow oxygen flow cannot be measured.
For the above oxygen high pressure micro flow differential pressure sensor, the following raw data of differential pressure and oxygen flow are obtained through experiments in this embodiment:
according to the test data, the following results are obtained: the pressure difference across the micro-pores 5 changes monotonically with increasing oxygen flow. Through data processing, a functional relationship between the oxygen flow Q and the pressure difference Δ P across the micro-pores 5 can be obtained.
As shown in fig. 2, the automatic oxygen flow regulating closed-loop control system based on the above-mentioned oxygen high-pressure micro-flow differential pressure sensor in the present embodiment is composed of an electromagnetic regulating valve, the above-mentioned oxygen high-pressure micro-flow differential pressure sensor, a differential pressure transmitter and a PLC controller. The electromagnetic regulating valve is arranged on a pipeline of the automatic oxygen adding device of the power plant boiler; the oxygen high-pressure micro-flow differential pressure sensor is communicated with a pipeline at the rear end of the electromagnetic valve; two acquisition ends of the differential pressure transmitter are respectively connected with a first pressure measurement point 3 and a second pressure measurement point 4 in the oxygen high-pressure micro-flow differential pressure sensor, and are used for acquiring the pressure at two sides of the micropore 5 and further acquiring the differential pressure delta P at two sides of the micropore 5; the signal input end of the PLC is connected with the signal output end of the differential pressure transmitter, and the signal output end of the PLC is connected with the signal input end of the electromagnetic regulating valve. The pressure difference transmitter sends a pressure difference delta P signal on two sides of the micropore 5 to the PLC controller in real time, the PLC controller obtains real-time oxygen flow Q based on the functional relation between the oxygen flow Q and the pressure difference delta P on two sides of the micropore 5, if the oxygen flow does not reach a target value, an electric signal Ib is sent to a signal input end of the electromagnetic regulating valve, the opening of the electromagnetic regulating valve is regulated, and the oxygen flow flowing through the pipeline of the automatic oxygen adding device of the power plant boiler is controlled until the oxygen flow reaches the target value. The oxygen flow can be adjusted in real time through the process, and the accurate control of the oxygen flow is realized. The utility model does not relate to a specific control algorithm, and related calculation methods are realized by adopting the prior art.
Claims (7)
1. The utility model provides an oxygen high pressure micro flow differential pressure sensor which characterized in that: the device is used for monitoring the flow of high-pressure trace oxygen in the automatic oxygen adding device of the power plant boiler and comprises an oxygen circulation pipeline (1) and a throttle plate (2) which is arranged in the oxygen circulation pipeline (1) along the radial direction of the oxygen circulation pipeline (1);
the oxygen circulation pipeline (1) is used for being connected in series on a pipeline to be detected, and a first pressure measuring point (3) and a second pressure measuring point (4) are arranged on the oxygen circulation pipeline (1); the first pressure measuring point (3) and the second pressure measuring point (4) are respectively positioned on the front side and the rear side of the throttle plate (2); defining that oxygen flows through the front side of the throttle plate (2) firstly and then flows through the rear side of the throttle plate (2);
micropores (5) are formed in the throttle plate (2) along the axial direction of the oxygen circulation pipeline (1), and the ratio of the diameter of the oxygen circulation pipeline (1) to the aperture of each micropore (5) is more than or equal to 3.
2. The oxygen high pressure micro flow differential pressure sensor according to claim 1, wherein: the axial center line of the micropore (5) is superposed with the axial center line of the oxygen circulation pipeline (1).
3. The oxygen high pressure micro flow differential pressure sensor according to claim 2, wherein: the oxygen circulation pipeline (1) is a circular pipe, and the micropores (5) are round holes.
4. The oxygen high pressure micro flow differential pressure sensor according to claim 3, wherein: the aperture of the micropores (5) is more than or equal to 0.1mm and less than or equal to 1 mm; the ratio of the diameter of the oxygen circulation pipeline (1) to the aperture of the micropore (5) is more than or equal to 5.
5. The oxygen high pressure micro flow differential pressure sensor according to claim 4, wherein: the throttle plate (2) is positioned in the middle of the oxygen circulation pipeline (1).
6. The oxygen high pressure micro flow differential pressure sensor according to claim 5, wherein: the ratio of the length of the oxygen gas flow pipe (1) to the thickness of the throttle plate (2) is not less than 20.
7. An automatically adjusting closed-loop control system, characterized by: the device is used for adjusting the flow of high-pressure trace oxygen in the automatic oxygen adding device of the power plant boiler; comprises an electromagnetic regulating valve, an oxygen high-pressure micro-flow differential pressure sensor, a differential pressure transmitter and a PLC controller, wherein the oxygen high-pressure micro-flow differential pressure sensor is as claimed in any one of claims 1 to 6;
the electromagnetic regulating valve is arranged on a pipeline of the automatic oxygen adding device of the power plant boiler;
the oxygen high-pressure micro-flow differential pressure sensor is connected in series with a pipeline at the rear end of the electromagnetic regulating valve;
two acquisition ends of the differential pressure transmitter are respectively connected with a first pressure measuring point (3) and a second pressure measuring point (4) in the oxygen high-pressure micro-flow differential pressure sensor;
the signal input end of the PLC is connected with the signal output end of the differential pressure transmitter, and the signal output end of the PLC is connected with the signal input end of the electromagnetic regulating valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220260482.4U CN216081613U (en) | 2022-02-09 | 2022-02-09 | Oxygen high-pressure micro-flow differential pressure sensor and automatic adjustment closed-loop control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220260482.4U CN216081613U (en) | 2022-02-09 | 2022-02-09 | Oxygen high-pressure micro-flow differential pressure sensor and automatic adjustment closed-loop control system |
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| Publication Number | Publication Date |
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| CN216081613U true CN216081613U (en) | 2022-03-18 |
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| CN202220260482.4U Active CN216081613U (en) | 2022-02-09 | 2022-02-09 | Oxygen high-pressure micro-flow differential pressure sensor and automatic adjustment closed-loop control system |
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| CN (1) | CN216081613U (en) |
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