CN211786737U - Monitoring device for gas-solid two-phase flow state in air chute - Google Patents
Monitoring device for gas-solid two-phase flow state in air chute Download PDFInfo
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- CN211786737U CN211786737U CN202020945497.5U CN202020945497U CN211786737U CN 211786737 U CN211786737 U CN 211786737U CN 202020945497 U CN202020945497 U CN 202020945497U CN 211786737 U CN211786737 U CN 211786737U
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Abstract
The monitoring device for the gas-solid two-phase flow state in the air chute comprises capacitance probe measuring units arranged on the air chute at intervals, purging pipelines correspondingly arranged with each group of capacitance probe measuring units, and a PLC automatic control system used for controlling the whole device. The purging pipeline is provided with an automatic purging pipeline switch valve; the PLC automatic control system receives signals from the capacitance probe measuring unit and cleans the capacitance probe by controlling the switch of the automatic switch valve of the purging pipeline; the capacitance probe measuring unit comprises at least three groups of capacitance probe components arranged in parallel, and each group of capacitance probe components comprises a fixed capacitor and a capacitance probe which are connected in series. The utility model discloses can pinpoint the point that the trouble took place, save the work of artifical investigation, save maintenance duration. The PLC automatic control system can open the automatic switch valve on the purging pipeline at regular time to purge the capacitance probe so as to keep the accuracy of the detection data.
Description
Technical Field
The utility model belongs to the technical field of power plant equipment, specifically belong to the monitoring devices of gas-solid two-phase flow state in the air chute.
Background
The air chute is a device for conveying bulk materials along a pipeline by utilizing air flow, and the working principle of the air chute is that the bulk materials are conveyed along the pipeline in a suspension state along with the air flow by utilizing the kinetic energy of the air flow. Can be used for the powder materials which are easy to fluidize, such as cement, fly ash and the like. The air chute has three conveying characteristics: light weight, low power consumption and large conveying capacity, so that more and more industries needing powder conveying tend to select the air chute as a novel conveying tool.
At present, the air chute generally adopts the peep hole to observe the condition that the material flows, but the inboard glass of peep hole is difficult to keep clean. In the process of conveying materials, the glass is easily stained with dust particles, so that the condition of the materials is not convenient to observe. And air chute easily appears the chute and leaks out, leaks the material phenomenon because of material erodees, wearing and tearing, and the cold air meets conditions such as high temperature material condensation, caking promptly, causes the chute to carry and takes place to block up, especially under the long distance transport condition, the location of fault point needs the staff one section to investigate, wastes time and energy.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a monitoring devices of gas-solid two-phase flow state in the air chute, the technical problem that prior art work efficiency is low, waste time and energy is solved.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
monitoring devices of gas-solid two-phase flow state in air chute, its characterized in that: the device comprises capacitance probe measuring units arranged on the air chute at intervals, purging pipelines arranged corresponding to each group of capacitance probe measuring units, and a PLC automatic control system used for controlling the whole device, wherein the purging pipelines are provided with automatic purging pipeline switching valves; the PLC automatic control system receives signals from the capacitance probe measuring unit and cleans the capacitance probe by controlling the switch of the automatic switch valve of the purging pipeline;
the capacitance probe measuring unit comprises at least three groups of capacitance probe assemblies arranged in parallel, each group of capacitance probe assemblies comprises a fixed capacitor and a capacitance probe which are connected in series, circuits on two sides of the fixed capacitor are respectively and electrically connected with a positive electrode and a negative electrode of a rectifier amplifier, the rectifier amplifier of each group of capacitance probe assemblies is also electrically connected with a multi-channel rectifier filter, the multi-channel rectifier filter rectifies an amplitude modulation signal output by the rectifier amplifier, an output signal is accessed into a PLC automatic control system through serial port communication or USB port communication, and the output signal is analyzed and processed in the PLC automatic control system and then displayed on a display.
Further preferably, the capacitance probe includes nook closing member and the protective layer of parcel outside the nook closing member, the protective layer includes internal shield layer, insulating layer and the outer sleeve of parcel on the nook closing member in order from inside to outside, the tip that the protective layer was stretched out to the nook closing member is probe detection portion, and protective layer tip, nook closing member are equipped with the epoxy that is used for sealed protective layer outward.
Further, the capacitance probe is vertically inserted from the upper shell of the air chute and is fixed with the air chute through a pipe joint.
Furthermore, the capacitance probes of the capacitance probe measuring unit increase in sequence, and the probe detection parts of different capacitance probes are respectively positioned at the upper part, the middle part and the lower part of the air chute.
In addition, the PLC automatic control system comprises an execution unit for controlling an automatic switch valve, a data processing unit for processing input data of the capacitance probe measuring unit and a decision control system for controlling the master control execution unit and the data processing unit, and the display is connected with the decision control system in a control mode.
More preferably, the outlet of the purging pipeline is aligned with the capacitance probe and used for cleaning the probe and keeping the accuracy of the detection data.
Compared with the prior art the utility model has the following characteristics and beneficial effect:
the utility model provides a monitoring devices of gas-solid two-phase flow state in air chute adopts electric capacity to visit and constitutes the distribution to carry out real-time on-line monitoring to the gas-solid fluid on the fixed site of air chute, and the automatic PLC automatic control system that returns of detection data makes things convenient for the operating personnel in time to discover the fault situation and artificial/take measures automatically. The device has the advantages of reasonable structure, simple installation, convenient maintenance, accurate signal and high precision, can accurately judge the gas-solid two-phase flow state in the air chute, ensures the long-term safe and stable operation of the device, and promotes the economic operation of a power plant.
The utility model discloses make things convenient for the inside gas-solid fluid motion state of operation personnel real-time supervision air chute and constitute and distribute, when the powder caking blockked up, according to the voltage graphic presentation that the display shows, can pinpoint the point that the trouble took place, save the work of artifical investigation, save maintenance duration. The PLC automatic control system can open the automatic switch valve on the purging pipeline at regular time and purge the capacitance probe so as to keep the accuracy of detection data, has the characteristics of safety, applicability and the like, has good popularization and practical value, and can produce good economic benefits after wide popularization and application.
Drawings
Fig. 1 is a block diagram of a monitoring device according to the present invention;
fig. 2 is a schematic diagram of a distribution structure of capacitance probe measurement units in an air chute according to the present invention;
fig. 3 is a schematic circuit diagram of a capacitance probe measuring unit according to the present invention;
FIG. 4 is a schematic view of the capacitor probe and the pipe joint according to the present invention;
fig. 5 is a schematic structural diagram of a capacitance probe according to the present invention.
Reference numerals: 1-an air chute; 2-purging the pipeline; 3-purging the pipeline automatic switch valve; 4-fixed capacitance; 5-a capacitance probe; 51-a stylet; 52-inner shield layer; 53-an insulating layer; 54-an outer sleeve; 55-epoxy resin; 56-pipe connection; 6-a rectifier amplifier; 7-a multichannel rectifier filter; 8-an execution unit; 9-a data processing unit; 10-a decision control system; 11-display.
Detailed Description
In order to make the technical means, innovative features, objectives and functions realized by the present invention easy to understand, the present invention will be further described below.
The embodiments described herein are specific embodiments of the present invention, and are intended to be illustrative of the concepts of the present invention, which are intended to be illustrative and exemplary, and should not be construed as limiting the scope of the embodiments of the present invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
A monitoring device for gas-solid two-phase flow state in an air chute comprises capacitance probe measuring units arranged on the air chute 1 at intervals, a purging pipeline 2 arranged corresponding to each group of capacitance probe measuring units, and a PLC automatic control system for a total control whole device, wherein a purging pipeline automatic switch valve 3 is arranged on the purging pipeline 2, in order to facilitate purging, as shown in figure 1, the PLC automatic control system specifically comprises an execution unit 8 for controlling the automatic switch valve, a data processing unit 9 for processing input data of the capacitance probe measuring units, and a decision control system 10 for the total control execution unit 8 and the data processing unit 9, a display 11 is connected with the decision control system 10 in a control way, the data processing unit 9 of the PLC automatic control system receives signals from the capacitance probe measuring units and controls the on-off of the purging pipeline automatic switch valve 3 through the execution unit 8, the cleaning of the capacitance probe 5 is realized.
The capacitance probe measurement unit comprises at least three groups of capacitance probe assemblies arranged in parallel, a plurality of groups of capacitance probe assemblies of each capacitance probe measurement unit are powered by a stabilized voltage power supply, as shown in fig. 3, each group of capacitance probe assemblies comprises a fixed capacitor 4 and a capacitance probe 5 which are connected in series through a zero setting circuit, circuits on two sides of the fixed capacitor 4 are respectively electrically connected with a positive electrode and a negative electrode of a rectifier amplifier 6, the rectifier amplifier 6 of each group of capacitance probe assemblies is also electrically connected with a multi-channel rectifier filter 7, after the multi-channel rectifier filter 7 rectifies an amplitude modulation signal output by the rectifier amplifier 6, an output signal is accessed into a PLC automatic control system through serial port communication or USB port communication, and the PLC automatic control system is analyzed and processed and then displayed on a display 11; as shown in fig. 5, the capacitance probe 5 specifically includes a stylet 51 and a protective layer wrapped outside the stylet 51, the protective layer includes an inner shielding layer 52, an insulating layer 53 and an outer sleeve 54 sequentially wrapped on the stylet 51 from inside to outside, the end of the stylet 51 extending out of the protective layer is a probe detection part, epoxy resin 55 for sealing the protective layer is arranged outside the protective layer end and the stylet 51, the capacitance probe 5 is vertically inserted into the housing on the air chute 1 and is fixed with the air chute 1 through a pipe joint 56, the outlet of the purging pipeline 2 is aligned with the capacitance probe 5 for cleaning the probe and maintaining the accuracy of the detection data.
Taking the example that each capacitance probe measuring unit comprises three sets of capacitance probe assemblies arranged in parallel, the capacitance probes 5 of the capacitance probe measuring units are sequentially increased, the probe detection parts of different capacitance probes 5 are respectively positioned at the upper part, the middle part and the lower part of the air chute 1, generally, as shown in fig. 4, three capacitance probes 5 can be supplied to one pipe joint 56, and the pipe joint 56 is fixed with the wall of the air chute 1 by welding, but not limited thereto. After the amplitude-modulated signals output by the three rectifier amplifiers 6 are rectified by each group of capacitance probe measuring units through a multi-channel rectifier filter 7, the output signals are accessed into a data processing unit 9 of the PLC automatic control system through serial port communication or USB port communication, the data are displayed on a display 11 after being processed, a voltage change graphic diagram at each group of capacitance probe measuring units is displayed on the display 11, whether the automatic purging pipeline switching valve 3 is opened or not can be manually determined according to a graphic diagram result, or the automatic purging pipeline switching valve 3 is automatically controlled to be opened or closed by the PLC automatic control system when the voltage change graphic diagram is located at a critical value.
The working method of the device for monitoring the gas-solid two-phase flow state in the air chute is characterized in that:
the method comprises the following steps: preparing work: the air chute does not work, and the material transportation does not begin, and capacitance probe 5 touches the air, and the capacitance value passes through capacitance probe measuring unit and turns into voltage signal to the data processing unit in the PLC automatic control system, shows on the display after data processing, shows as the voltage straight line, and the numerical value is 0 v.
Step two: the continuous detection starts: the air chute starts to work, if the fluidized gas and the powder are uniformly mixed at the position of the capacitance probe 5, the gas-solid fluid moves smoothly, the capacitance value fluctuates along with time, the capacitance value is converted into a voltage signal through the capacitance probe measuring unit and is transmitted to a data processing unit 9 in the PLC automatic control system, the voltage signal is displayed on a display 11 after data processing, the voltage signal is displayed as a voltage curve, and the numerical value fluctuates between 0v and the maximum value;
if the capacitance probe 5 contacts the solid block, the capacitance value is converted into a voltage signal through the capacitance probe measuring unit, the voltage signal is transmitted to a data processing unit 9 in the PLC automatic control system, the voltage signal is displayed on a display 11 after data processing, the voltage signal is displayed as a voltage straight line, and the numerical value is the maximum value of the voltage;
step three: purging: the voltage value is continuously displayed as the maximum value, the capacitance probe is blocked, an operator controls an automatic switch valve 3 of a purging pipeline on a purging pipeline 2 to be opened through a PLC automatic control system to clean the probe, after cleaning, the voltage value transmitted back by the probe is a curve, and the value fluctuates between 0v and the maximum value; in this step, the PLC automatic control system may be set to periodically open the purge line automatic switch valve 3 on the purge line 2 to purge the probe.
Step four: manual overhaul: after purging in the third step, the voltage value transmitted back by the capacitance probe 5 is still a straight line and the value is the maximum value of the voltage, the blocking and blocking of the position still exist, a field operator should open the air chute for maintenance, and after the maintenance is finished, the voltage curve shows that the value is a continuous fluctuation value between 0v and the maximum value.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. Monitoring devices of gas-solid two-phase flow state in air chute, its characterized in that: the device comprises capacitance probe measuring units arranged on an air chute (1) at intervals, purging pipelines (2) arranged corresponding to each group of capacitance probe measuring units, and a PLC automatic control system used for controlling the whole device, wherein purging pipeline automatic switch valves (3) are arranged on the purging pipelines (2); the PLC automatic control system receives signals from the capacitance probe measuring unit and cleans the capacitance probe (5) by controlling the on-off of the automatic switching valve (3) of the purging pipeline;
the capacitance probe measuring unit comprises at least three groups of capacitance probe assemblies arranged in parallel, each group of capacitance probe assemblies comprises a fixed capacitor (4) and a capacitance probe (5) which are connected in series, circuits on two sides of the fixed capacitor (4) are respectively electrically connected with the positive electrode and the negative electrode of a rectifier amplifier (6), the rectifier amplifier (6) of each group of capacitance probe assemblies is also electrically connected with a multi-channel rectifier filter (7), after the multi-channel rectifier filter (7) rectifies an amplitude modulation signal output by the rectifier amplifier (6), an output signal is accessed into a PLC automatic control system through serial port communication or USB port communication, and the PLC automatic control system is analyzed and processed and then displayed on a display (11); capacitance probe (5) are including nook closing member (51) and the protective layer of parcel outside nook closing member (51), the protective layer includes by interior and outer parcel internal shield layer (52), insulating layer (53) and outer sleeve (54) on nook closing member (51) in order, the tip that nook closing member (51) stretched out the protective layer is probe detection portion, and protective layer tip, nook closing member (51) are equipped with epoxy (55) that are used for sealed protective layer outward.
2. The device for monitoring the gas-solid two-phase flow state in the air chute as claimed in claim 1, wherein: the capacitance probe (5) is vertically inserted from the upper shell of the air chute (1) and is fixed with the air chute (1) through a pipe connector (56).
3. The device for monitoring the gas-solid two-phase flow state in the air chute as claimed in claim 1, wherein: capacitance probes (5) of the capacitance probe measuring unit are sequentially increased, and probe detection parts of different capacitance probes (5) are respectively positioned at the upper part, the middle part and the lower part of the air chute (1).
4. The device for monitoring the gas-solid two-phase flow state in the air chute as claimed in claim 2, wherein: the PLC automatic control system comprises an execution unit (8) for controlling an automatic switch valve, a data processing unit (9) for processing input data of the capacitance probe measuring unit and a decision control system (10) for controlling the execution unit (8) and the data processing unit (9), and the display (11) is connected with the decision control system (10) in a control mode.
5. The device for monitoring the gas-solid two-phase flow state in the air chute as recited in any one of claims 1 to 4, wherein: the outlet of the purging pipeline (2) is aligned with the capacitance probe (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020945497.5U CN211786737U (en) | 2020-05-29 | 2020-05-29 | Monitoring device for gas-solid two-phase flow state in air chute |
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| CN202020945497.5U CN211786737U (en) | 2020-05-29 | 2020-05-29 | Monitoring device for gas-solid two-phase flow state in air chute |
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| CN211786737U true CN211786737U (en) | 2020-10-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111487921A (en) * | 2020-05-29 | 2020-08-04 | 北京国电电力有限公司萨拉齐电厂 | Online continuous monitoring device and method for gas-solid two-phase flow state in air chute |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111487921A (en) * | 2020-05-29 | 2020-08-04 | 北京国电电力有限公司萨拉齐电厂 | Online continuous monitoring device and method for gas-solid two-phase flow state in air chute |
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Address after: 014100 xiaoaodui village, Laqi Town, tumed Right Banner, Baotou City, Inner Mongolia Autonomous Region Patentee after: Salaqi power plant of Beijing Guodian Power Co.,Ltd. Patentee after: Guoneng Longyuan environmental protection Co.,Ltd. Address before: 014100 xiaoaodui village, Laqi Town, tumed Right Banner, Baotou City, Inner Mongolia Autonomous Region Patentee before: Salaqi power plant of Beijing Guodian Power Co.,Ltd. Patentee before: BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENGINEERING Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |