CN112258806A - Novel steam leakage detection device and method - Google Patents

Novel steam leakage detection device and method Download PDF

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Publication number
CN112258806A
CN112258806A CN202011279841.2A CN202011279841A CN112258806A CN 112258806 A CN112258806 A CN 112258806A CN 202011279841 A CN202011279841 A CN 202011279841A CN 112258806 A CN112258806 A CN 112258806A
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China
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processor
steam leakage
monitoring
detection device
temperature
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Inventor
栾松年
孙云
张志勇
孙熠
高洁
苗强
王海龙
徐腾腾
马相女
朱鲁涛
张绍磊
李璐
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China Tobacco Shandong Industrial Co Ltd
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China Tobacco Shandong Industrial Co Ltd
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Priority to CN202011279841.2A priority Critical patent/CN112258806A/en
Publication of CN112258806A publication Critical patent/CN112258806A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18Status alarms
    • G08B21/187Machine fault alarms
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/10Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B7/00Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
    • G08B7/06Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

The invention provides a novel steam leakage detection device and a method, belonging to the technical field of tobacco production equipment, wherein the novel steam leakage detection device comprises a monitoring device, a data analysis device, a wireless gateway, an alarm device and a control device; the monitoring device is used for monitoring whether the station room and the pipeline valve leak air or not; the data analysis device is connected with the monitoring device and is used for analyzing the air leakage positions of the station room and the pipeline valve; the wireless gateway is connected with the data analysis device and used for wireless signal communication; the alarm device is connected with the wireless gateway and used for pushing alarm information; the control device is connected with the wireless gateway and is used for controlling the operation of the exhaust fan, and the position of steam leakage equipment can be judged in time after steam leakage occurs; the historical data is stored in a digital mode, and trend analysis and operation pre-judgment of the historical data are achieved; the alarm information is timely pushed to the monitoring center, so that maintenance personnel can go to the site for maintenance in time.

Description

Novel steam leakage detection device and method
Technical Field
The invention belongs to the technical field of tobacco production equipment, and particularly relates to a novel steam leakage detection device and a novel steam leakage detection method.
Background
The steam system is used as the only energy source directly participating in the production process of the cigarette products, and the quality of the steam directly influences the quality of the cigarette products. The steam application is extensive, and the steam pipeline is complicated to relate to a plurality of stations rooms, and steam system has characteristics such as high pressure, high temperature, danger big, does not well investigate the problem of steam leakage, has great hidden danger. The steam system contains numerous pipe fittings such as pipeline, valve, filter, sight glass and steam trap, and big hidden danger such as pipeline sand eye, valve seal gasket damage and steam trap trouble all can cause steam to reveal.
Meanwhile, the steam delivery pipeline is externally provided with an aluminum skin heat-insulating material, so that the problem of steam leakage is difficult to find. The steam energy waste can be caused by the problems that the steam trap is easy to block due to welding slag or rust generated in the steam pipeline, the steam trap is prone to being broken down after drainage, automatic reset cannot be achieved, and steam in the pipeline is discharged.
Only when the steam leaks to a certain degree, the steam can be found by inspection of the operator on duty, the operator on duty can not find the steam leakage of the steam trap in time, the energy is wasted, a large amount of steam exists in the station room, and great potential safety hazards exist.
Disclosure of Invention
The embodiment of the invention provides a novel steam leakage detection device and a novel steam leakage detection method, and aims to solve the problems that existing steam pipelines are aged, pipes such as valves and steam traps are aged to cause damage and leakage of the pipelines, when steam leaks to a certain degree, the steam leakage can be found by inspection of an attendant, and the attendant cannot find out that the steam leaks from the steam traps timely.
In view of the above problems, the technical solution proposed by the present invention is:
the invention provides a novel steam leakage detection device, which comprises a monitoring device, a data analysis device, a wireless gateway, an alarm device and a control device, wherein the monitoring device comprises a monitoring unit, a data analysis device, a wireless gateway and a control device, wherein the monitoring device comprises a monitoring unit, a data analysis device, a wireless gateway and a control device, and the:
the monitoring device is used for monitoring whether the station room and the pipeline valve leak air or not;
the monitoring device comprises a temperature and humidity sensor and a pressure sensor, the temperature and humidity sensor is installed in the station room, and the pressure sensor is installed on the pipeline valve;
the data analysis device is connected with the monitoring device and is used for analyzing the air leakage positions of the station room and the pipeline valve;
the data analysis device comprises a first processor and a wireless signal transmitter, wherein the signal output end of the first processor is in communication connection with the signal input end of the wireless signal transmitter;
the wireless gateway is connected with the data analysis device and used for wireless signal communication;
the alarm device is connected with the wireless gateway and used for pushing alarm information;
the control device is connected with the wireless gateway and used for controlling the operation of the exhaust fan.
As a preferable technical solution of the present invention, there is at least one monitoring device.
As a preferred technical scheme of the invention, the wireless gateway comprises a 232 serial port, a 485 serial port and an MODBUS/DO serial port.
As a preferred technical solution of the present invention, the alarm device includes a second processor, a buzzer, an alarm lamp, a memory and a wireless signal transceiver, wherein a signal output terminal of the 232 serial port is in communication connection with a signal input terminal of the second processor, a signal output terminal of the second processor is in communication connection with signal input terminals of the buzzer and the alarm lamp, respectively, and the second processor is in communication connection with the memory and the wireless signal transceiver, respectively.
As a preferred technical scheme of the invention, the control device comprises a PLC (programmable logic controller) and an exhaust fan, the signal output ends of the 485 serial port and the MODBUS/DO serial port are in communication connection with the signal input end of the PLC, and the signal output end of the PLC is in communication connection with the signal input end of the exhaust fan.
As a preferred technical solution of the present invention, the detecting device further includes a monitoring center, and the monitoring center is in communication connection with the wireless signal transceiver.
As a preferable aspect of the present invention, the transmission signal of the wireless signal transceiver is any one of 4G and 5G.
In a second aspect, an embodiment of the present invention provides a working method based on a novel steam leakage detection device, including the following steps:
s1, monitoring in real time, wherein a temperature and humidity sensor and a pressure sensor respectively monitor the pressure of a temperature and humidity real-time monitoring pipeline valve of a station house in real time, and when the detection data of the temperature and humidity sensor and the pressure sensor are higher than the preset value of a first processor, the temperature and humidity sensor and the pressure sensor send pulse signals to the first processor;
s2, positioning steam leakage, analyzing specific positions of the temperature and humidity sensor and the pressure sensor by the first processor according to pulse signals of the temperature and humidity sensor and the pressure sensor, and feeding the steam leakage position back to the second processor and the PLC through the wireless gateway;
s3, alarm information pushing and maintaining, after the second processor obtains specific position information, the buzzer for controlling the steam leakage position buzzes and the alarm lamp flickers, the steam leakage event is recorded through the memory, meanwhile, the second processor feeds back the monitoring center through the wireless signal transceiver, maintenance personnel can be informed in time to go to the damaged position for maintenance, and the PLC controls the exhaust fan to start.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least: the automatic acquisition and real-time monitoring of the equipment state information and the temperature and humidity data of the temperature and humidity sensor and the pressure sensor are realized, so that whether steam leaks or not is detected; the position of steam leakage equipment can be judged in time after steam leakage occurs; the historical data is stored in a digital mode, and trend analysis and operation pre-judgment of the historical data are achieved; the alarm information is timely pushed to the monitoring center, so that maintenance personnel can go to the site for maintenance in time.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a schematic diagram of a template data transformation system according to the present disclosure;
FIG. 2 is a flow chart of a method for operating a template data transformation system according to the present invention.
Description of reference numerals: 1000-detection device, 100-monitoring device, 110-temperature and humidity sensor, 120-pressure sensor, 200-data analysis device, 210-first processor, 220-wireless signal transmitter, 300-wireless gateway, 310-232 serial port, 320-485 serial port, 330-MODBUS/DO serial port, 400-alarm device, 410-second processor, 420-buzzer, 430-alarm lamp, 440-memory, 450-wireless signal transceiver, 500-control device, 510-PLC logic controller, 520-exhaust fan, 600-monitoring center.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Example one
Referring to the attached figure 1, the invention provides a technical scheme: a novel steam leakage detection device 1000 is provided, wherein the detection device 1000 comprises a monitoring device 100, a data analysis device 200, a wireless gateway 300, an alarm device 400 and a control device 500.
The monitoring device 100 is used for monitoring whether the station room and the pipeline valve leak air or not; the monitoring device 100 comprises a temperature and humidity sensor 110 and a pressure sensor 120, the temperature and humidity sensor 110 is installed in a station room, the pressure sensor 120 is installed on a pipeline valve, the temperature and humidity sensor 110 is used for monitoring the temperature and the humidity of the station room in real time, the pressure sensor 120 is used for monitoring the pressure of the pipeline valve in real time, and when the data detected by the temperature and humidity sensor 110 and the pressure sensor 120 are higher than the preset value of the first processor 210, the temperature and humidity sensor 110 and the pressure sensor 120 send pulse signals to the first processor 210.
The data analysis device 200 is connected with the monitoring device 100 and is used for analyzing the air leakage positions of the station rooms and the pipeline valves; the data analysis device 200 comprises a first processor 210 and a wireless signal transmitter 220, wherein a signal output end of the first processor 210 is in communication connection with a signal input end of the wireless signal transmitter 220, the first processor 210 analyzes specific position information of the temperature and humidity sensor 110 and the pressure sensor 120 according to pulse signals of the temperature and humidity sensor 110 and the pressure sensor 120, and transmits the information to the alarm device 400 and the control device 500 through the wireless gateway 300.
The wireless gateway 300 is connected with the data analysis apparatus 200 for wireless signal communication;
the alarm device 400 is connected with the wireless gateway 300 and used for pushing alarm information;
the control device 500 is connected to the wireless gateway 300, and is used for controlling the operation of the exhaust fan 520.
The embodiment of the invention is also realized by the following technical scheme.
In an embodiment of the present invention, there is at least one monitoring device 100.
In the embodiment of the invention, the wireless gateway 300 comprises a 232 serial port 310, a 485 serial port 320 and a MODBUS/DO serial port 330, wherein the 485 serial port 320 is provided with a two-wire RS485 communication interface and provides a standard MODBUS-RTU communication protocol, and the MODBUS/DO serial port 330 can convert the standard MODBUS protocol into a standard DP protocol.
In the embodiment of the present invention, the alarm device 400 includes a second processor 410, a buzzer 420, an alarm lamp 430, a memory 440 and a wireless signal transceiver 450, a signal output end of a serial port 310 of 232 is in communication connection with a signal input end of the second processor 410, a signal output end of the second processor 410 is in communication connection with signal input ends of the buzzer 420 and the alarm lamp 430, respectively, the second processor 410 is in communication connection with the memory 440 and the wireless signal transceiver 450, respectively, after the second processor 410 obtains specific position information, the buzzer 420 for controlling a steam leakage position first buzzes and the alarm lamp 430 flashes, and records the steam leakage through the memory 440, so as to facilitate later reference.
In the embodiment of the present invention, the control device 500 includes a PLC logic controller 510 and an exhaust fan 520, signal output terminals of the 485 serial port 320 and the MODBUS/DO serial port 330 are both in communication connection with a signal input terminal of the PLC logic controller 510, a signal output terminal of the PLC logic controller 510 is in communication connection with a signal input terminal of the exhaust fan 520, when steam leakage occurs, the data analysis device 200 sends a pulse signal to the PLC logic controller 510 through the wireless gateway 300, and the PLC logic controller 510 controls the exhaust fan 520 to start, so that waste of steam energy can be avoided.
In the embodiment of the present invention, the detecting device 1000 further includes a monitoring center 600, the monitoring center 600 is in communication connection with the wireless signal transceiver 450, and when a steam leakage alarm occurs, the second processor 410 further feeds back the monitoring center 600 through the wireless signal transceiver 450, so as to timely notify a maintenance worker to go to a damaged position for maintenance.
In the embodiment of the present invention, the transmission signal of the wireless signal transceiver 450 is any one of 4G and 5G.
Example two
The embodiment of the invention also discloses a working method of the novel steam leakage detection device, which is shown by referring to the attached figure 2 and comprises the following steps:
s1, monitoring in real time, wherein the temperature and humidity sensor 110 and the pressure sensor 120 respectively monitor the temperature and humidity of the station room and the pressure of the pipeline valve in real time, and when the data detected by the temperature and humidity sensor 110 and the pressure sensor 120 are higher than the preset value of the first processor 210, the temperature and humidity sensor 110 and the pressure sensor 120 send pulse signals to the first processor 210;
s2, positioning steam leakage, wherein the first processor 210 analyzes specific positions of the temperature and humidity sensor 110 and the pressure sensor 120 according to pulse signals of the temperature and humidity sensor 110 and the pressure sensor 120, and feeds the steam leakage position back to the second processor 410 and the PLC 510 through the wireless gateway 300;
s3, alarm information pushing and maintenance, after the second processor 410 obtains specific position information, the buzzer 420 for controlling the steam leakage position buzzes and the alarm lamp 430 flickers, the steam leakage event is recorded through the memory 440, meanwhile, the second processor 420 feeds back the monitoring center 600 through the wireless signal transceiver 450, maintenance personnel can be informed to go to the damaged position for maintenance in time, and the PLC 510 controls the exhaust fan 520 to start.
Specifically, the working principle of the novel steam leakage detection device and the method is as follows: the temperature and humidity sensor 110 is used for monitoring the temperature and humidity of a station room in real time, the pressure sensor 120 is used for monitoring the pressure of a pipeline valve in real time, when the data detected by the temperature and humidity sensor 110 and the pressure sensor 120 are higher than the preset value of the first processor 210, the temperature and humidity sensor 110 and the pressure sensor 120 send pulse signals to the first processor 210, the first processor 210 analyzes the specific position information of the temperature and humidity sensor 110 and the pressure sensor 120 according to the pulse signals of the temperature and humidity sensor 110 and the pressure sensor 120, and transmits the information to the second processor 410 and the PLC 510 through the wireless gateway 300, after the second processor 410 obtains the specific position information, the buzzer 420 for controlling the steam leakage position firstly buzzes and the alarm lamp 430 flickers, and records the steam leakage at this time through the memory 440, so as to be referred in the later period, and simultaneously, the second processor 410 also feeds back the monitoring center 600 through the wireless signal transceiver 450, so that a maintenance worker can be informed to go to the damaged position for maintenance in time, and the PLC logic controller 510 controls the exhaust fan 520 to start, thereby avoiding waste of steam energy.
It should be noted that, the specific model specifications of the temperature and humidity sensor 110, the first processor 210 of the pressure sensor 120, the wireless signal transmitter 220, the wireless gateway 300, the second processor 410, the buzzer 420, the alarm lamp 430, the memory 440, the wireless signal transceiver 450 and the PLC logic controller 510 need to be determined by type selection according to the actual specification of the device, and the specific type selection calculation method adopts the prior art in the field, and therefore, detailed description is omitted.
The power supply and the principle of the temperature and humidity sensor 110, the first processor 210 of the pressure sensor 120, the wireless signal transmitter 220, the wireless gateway 300, the second processor 410, the buzzer 420, the alarm lamp 430, the memory 440, the wireless signal transceiver 450 and the PLC logic controller 510 are clear to those skilled in the art and will not be described in detail herein.
It should be understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not intended to be limited to the specific order or hierarchy presented.
In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. Of course, the processor and the storage medium may reside as discrete components in a user terminal.
For a software implementation, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in memory units and executed by processors. The memory unit may be implemented within the processor or external to the processor, in which case it can be communicatively coupled to the processor via various means as is known in the art.
What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".

Claims (8)

1. A novel steam leakage detection device (1000), characterized in that, detection device (1000) includes monitoring device (100), data analysis device (200), wireless gateway (300), alarm device (400) and controlling means (500):
the monitoring device (100) is used for monitoring whether the station room and the pipeline valve leak air or not;
the monitoring device (100) comprises a temperature and humidity sensor (110) and a pressure sensor (120), the temperature and humidity sensor (110) is installed in the station room, and the pressure sensor (120) is installed on the pipeline valve;
the data analysis device (200) is connected with the monitoring device (100) and is used for analyzing the air leakage positions of the station rooms and the pipeline valves;
the data analysis device (200) comprises a first processor (210) and a wireless signal transmitter (220), wherein a signal output end of the first processor (210) is connected with a signal input end of the wireless signal transmitter (220) in a communication mode;
the wireless gateway (300) is connected with the data analysis device (200) and used for wireless signal communication;
the alarm device (400) is connected with the wireless gateway (300) and used for pushing alarm information;
the control device (500) is connected with the wireless gateway (300) and is used for controlling the operation of the exhaust fan (520).
2. A new steam leak detection device (1000) according to claim 1, characterized in that there is at least one monitoring device (100).
3. The novel steam leakage detection device (1000) according to claim 1, wherein the wireless gateway (300) comprises a 232 serial port (310), a 485 serial port (320) and a MODBUS/DO serial port (330).
4. The novel steam leakage detection device (1000) according to claim 3, wherein the alarm device (400) comprises a second processor (410), a buzzer (420), an alarm lamp (430), a memory (440) and a wireless signal transceiver (450), the signal output end of the 232 serial port (310) is in communication connection with the signal input end of the second processor (410), the signal output end of the second processor (410) is in communication connection with the signal input ends of the buzzer (420) and the alarm lamp (430), respectively, and the second processor (410) is in communication connection with the memory (440) and the wireless signal transceiver (450), respectively.
5. The novel steam leakage detection device (1000) according to claim 3, wherein the control device (500) comprises a PLC (programmable logic controller) (510) and an exhaust fan (520), the signal output ends of the 485 serial port (320) and the MODBUS/DO serial port (330) are both in communication connection with the signal input end of the PLC (510), and the signal output end of the PLC (510) is in communication connection with the signal input end of the exhaust fan (520).
6. The novel steam leakage detection device (1000) according to claim 4, wherein the detection device (1000) further comprises a monitoring center (600), and the monitoring center (600) is communicatively connected with the wireless signal transceiver (450).
7. The novel steam leakage detection device (1000) according to claim 4, wherein the transmission signal of the wireless signal transceiver (450) is any one of 4G or 5G.
8. The working method of the novel steam leakage detection device is applied to the novel steam leakage detection device as claimed in claims 1-7, and is characterized by comprising the following steps of:
s1, real-time monitoring is carried out, the temperature and humidity sensor (110) and the pressure sensor (120) respectively monitor the pressure of a temperature and humidity real-time monitoring pipeline valve of a station room in real time, and when the detection data of the temperature and humidity sensor (110) and the pressure sensor (120) are higher than the preset value of the first processor (210), the temperature and humidity sensor (110) and the pressure sensor (120) send pulse signals to the first processor (210);
s2, positioning steam leakage, wherein the first processor (210) analyzes specific positions of the temperature and humidity sensor (110) and the pressure sensor (120) according to pulse signals of the temperature and humidity sensor (110) and the pressure sensor (120), and feeds the steam leakage position back to the second processor (410) and the PLC (510) through the wireless gateway (300);
s3, alarm information pushing and maintaining, after the second processor (410) obtains specific position information, the buzzer (420) for controlling the steam leakage position buzzes and the alarm lamp (430) flickers, the steam leakage event is recorded through the memory (440), meanwhile, the second processor (420) feeds back the monitoring center (600) through the wireless signal transceiver (450), maintenance personnel can be informed to the damaged position in time to maintain, and the PLC (510) controls the exhaust fan (520) to start.
CN202011279841.2A 2020-11-16 2020-11-16 Novel steam leakage detection device and method Pending CN112258806A (en)

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