CN107888414A - A kind of biogas leakage monitoring system based on NB IoT - Google Patents
A kind of biogas leakage monitoring system based on NB IoT Download PDFInfo
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- CN107888414A CN107888414A CN201711071077.8A CN201711071077A CN107888414A CN 107888414 A CN107888414 A CN 107888414A CN 201711071077 A CN201711071077 A CN 201711071077A CN 107888414 A CN107888414 A CN 107888414A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
- H04L67/025—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP] for remote control or remote monitoring of applications
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
- G08B21/16—Combustible gas alarms
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm 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
- G08B25/10—Alarm 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
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0631—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
- H04L63/0876—Network architectures or network communication protocols for network security for authentication of entities based on the identity of the terminal or configuration, e.g. MAC address, hardware or software configuration or device fingerprint
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Abstract
The invention discloses a kind of biogas based on NB IoT to reveal monitoring system, and the system includes methane concentration detection module, master controller, display module, sound and light alarm module, power module, NB wireless transport modules, Internet of Things cloud platform and user terminal；The methane concentration at CH_4 detection module detection scene；Master controller is by the methane concentration detected compared with alarm threshold value, judge whether to alarm, and by concentration data, networking state and alarm condition are sent to display module, concentration data is sent to NB wireless transport modules simultaneously, and the instruction that analyzing platform issues, automatically adjust the frequency of CH_4 detection；NB wireless transport modules will be dealt into Internet of Things cloud platform in methane concentration information and alarm condition.Present system realizes the detection of biogas leakage and the Centralized Monitoring on platform, promptly and accurately sends the alarm of biogas leakage, guarantees personal safety and property safety.
Description
Technical field
The present invention relates to biogas leak detection field, more particularly to a kind of biogas detection warning system based on NB-IoT.
Background technology
Rural methane facilities development is to promote Rural Sustainable Development, solve rural culture pollution, realize having for agriculture low-carbon
Effect measure.Building methane-generating pit can use 20 years or so, comprehensively utilized methane-generating pit can not only save the energy, improve and
Environmental protection, it is many also to save chemical fertilizer and agricultural chemicals, the yield and quality for improving crops, promotion and drive animal husbandry development etc.
Benefit.According to statistics, biogas is in the coverage rate in rural area close to 30%, and while being offered convenience to peasant household, there is also let out for it
Reveal hidden danger.The detection and alarm that biogas is revealed in life production are the life security of the people and trying hard to keep for property safety
Barrier, the biogas leakage monitoring system realized herein can carry out automatic data collection to biogas concentration information, wirelessly transmitting data, have remote
Journey warning function.
In in general biogas leak detection systems, biogas leakage monitoring often uses the mould of portable inspectiont warning device
Formula.Need personnel periodically to go live inspection using portable inspectiont warning device, and the natural pond of different location can not be detected simultaneously
Gas concentration.Whether carrying the manual inspection of portable detection equipment, can only regularly to detect methane concentration exceeded, when sending leakage not
Energy and alarm, add potential safety hazard.
The content of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of biogas leakage monitoring system based on NB-IoT
System.
The purpose of the present invention is achieved through the following technical solutions：A kind of biogas leakage monitoring system based on NB-IoT
System, the system include methane concentration detection module, master controller, display module, audible-visual annunciator module, power module, NB without
Line transport module, Internet of Things cloud platform and user terminal；
The methane concentration detection module uses import infrared type sensing methane concentration device, measurable 0-100%LEL, essence
Degree reaches 0.1%LEL, operating current 15mA, low in energy consumption, is communicated using UART；Designed using common bottom plate, can be by plugging more
Emat sensor, it is easy to the later maintenance of system, and reserved analog quantity coffret, communication interface can be used as simulation output
Other model sensors, there is certain versatility；
Automatic adjusument feedback mechanism built in the master controller, biogas can be adjusted according to the biogas concentration that Site Detection arrives
The detection frequency of concentration detection module, ensure the real-time of concentration data, send alarm in time；Main controller detection methane concentration inspection
Survey module collection methane concentration data time interval, and main controller transmission methane concentration data and status alert information to
The time interval of NB wireless transport modules, determine, master controller receives NB and wirelessly passed all in accordance with the live biogas concentration detected
The Internet of Things cloud platform of defeated module transfer instructs the live natural pond that to set three-level alarm threshold value, methane concentration detection module is gathered
Gas concentration adjusts above-mentioned two time interval according to relative size compared with three-level alarm threshold value, into different
Detection state, alarm is sent, record alarm condition and time of fire alarming, and NB wireless transport modules are provided and report cloud platform, realized
Automatic adjusument, it is specially：When methane concentration is in normal range (NR), methane concentration detection module and NB wireless transport modules
Cloud platform is uploaded to fixed frequency respectively；When methane concentration exceedes lowermost level alarm threshold value, shown on display module
Alarm and reminding, while the time interval of methane concentration detection module detection methane concentration is adjusted, and transmission methane concentration data
With the time interval of status information alarmed with the first order, the frequency detected by increasing methane concentration, methane concentration is reduced
The interval that information and alarm condition report, increase system obtain the real-time of field data, ensure to obtain in time when revealing
Take state；When methane concentration exceedes second level alarm threshold value, sound and light alarm module is opened immediately, is adjusted two time intervals, is entered
One step increases the detection frequency of methane concentration detection module, and shortening reports interval, increases the real-time of Concentration Testing, while will report
Warn the time and the status information with second level alarm is transferred to Internet of Things cloud platform, Internet of Things cloud by NB wireless transport modules
Platform notice user terminal alarm, notifies related personnel in time；When methane concentration exceedes third level alarm threshold value, represent that methane is dense
Spend close to LEL, it may occur however that blast, the alarm sound of sound and light alarm module is maximum, and there is explosion danger at prompting scene, and personnel on the scene remove
From；
The display module uses 65*132 dot matrix LCD display screens, has backlight, concentration numbers are clearly showed that with large print
According to, and display alarm state and networking state；
The audible-visual annunciator module uses explosion-proof audible-visual annunciator of the explosive-proof grade for ExdllCT6Gb, has super bright
Luminous tube, the maximum sound intensity reach 100db, range of light intensity 1800-2400mcd, 1 second/time of frequency；
The NB wireless transport modules include NB modules and ipex antenna pedestals, and NB modules are led to by UART mouths with master controller
Letter；It is activated after receiving the packet of master controller, working condition is switched to from resting state, the packet received is sent
To Internet of Things cloud platform；Receive and parse through the user instruction data that Internet of Things cloud platform issues；
When the Internet of Things cloud platform receives the packet of NB wireless transport modules transmission, packet is verified first
With identification, illegal packet text is filtered；Valid data are parsed in legal packet and store the data to Internet of Things
In net cloud platform, while it can be required to push to valid data into the data server and user terminal of user according to user；Internet of Things
Net cloud platform can also receive the user instruction of user terminal transmission, and user instruction is issued into NB modules.
Further, the master controller is the low-power consumption microcontroller STM32F302CC of ST Microelectronics；Micro-control
Device processed is based on Cortex-M4 kernels, FLASH and 40KB of the microcontroller with 16MB SRAM, and electric current is as little as under park mode
30uA；Operating voltage range is 2.3~3.6V；The peripheral circuit of master controller is by clock circuit, reset circuit, power conversion electricity
Road forms；System clock includes high frequency clock and RTC clock, and high frequency clock is produced by 16MHz, when RTC clock is by 32.768KHz
Clock produces；Power module 24V input voltages directly feed audible-visual annunciator module, by 24V input power be depressured to 5V and
3.3V, wherein 3.3V power for methane concentration detection module, and 5V is depressured to 3.3V and 3.8V and carried for master controller with NB modules again
For working power.
Further, on master controller after electricity, hardware interface is initialized first, completes serial port baud rate and verification
The configuration of position；Then NB modules are configured, activation NB modules enter working condition, search NB network signals, and complete into
Net operation；After NB modules access network, master controller starts to perform the cloud platform operation of connection Internet of Things, makes NB module accessing users
The Internet of Things cloud platform specified；NB modules are connected to Internet of Things cloud platform and send checking information, checking to Internet of Things cloud platform
Internet of Things cloud platform, which issues to verify, during success successfully instructs；
After master controller receives verification success message, timer is started working, and starts to obtain first after each timers trigger
The concentration data of alkane concentration detection module, and concentration data is sent to display module and shown, while methane concentration number
According to compared with the three-level methane concentration threshold value of storage, judge whether to alarm, if start automatic adjusument mechanism；Handle afterwards
Concentration data and warning message with alert levels, which are sent to NB wireless transport modules, is uploaded to Internet of Things cloud platform；Main control
Device receives the instruction that cloud platform issues simultaneously, obtains IP address after parsing, carries out the checking of IP address, carries out the identity of cloud platform
Checking, cloud platform can set the frequency of methane concentration detection module simultaneously, set three-level methane concentration alarm threshold value；Cloud platform
Correction is synchronized to the time of master controller simultaneously；Complete packet text is generated according to the communication protocol requirements of NB modules；
Complete packet is sent to after NB modules by master controller by UART interface enters resting state, and RTC makes a noise next time for wait
Clock wakes up or UART interrupt instructions wake up；When master controller in a dormant state when, the instruction that user issues is put down by Internet of Things cloud
Platform is issued to NB modules；NB modules completely receive the decoding effort of instruction, and effective instruction data are sent to master controller
UART；Master controller is activated, analysis instruction data, obtains user instruction and order is responded and response.
Further, the NB modules are BC95-CM:B8, module normal working voltage scope are 3.1~4.2V, dormancy
Operating current as little as 10uA under state；NB modules realize the signal sensitivity as little as -135dBm of data communication；NB modules possess two
Individual UART interface and an ADC interface, the two-way communication that UART interface is used between NB modules and master controller are consolidated with NB modules
Part upgrades, and ADC interface monitors for system charge；BC95-CM:B8 supports 900MHz frequency ranges, passes through mobile cellular network technology
Core network access, then connected through route, fire wall and public network.
Further, user terminal obtains methane concentration detection module from the data server of Internet of Things cloud platform or user
The data of collection, and realize the monitoring and analysis to the methane concentration data of different location in Internet of Things cloud platform；User terminal
Three-level methane concentration alarm threshold value, sample frequency and alarm means can be configured；And inquire about the note of time of fire alarming and concentration
Record, when the live master controller arranged in system, there are abnormal conditions in methane concentration detection module or NB wireless transport modules, use
Family terminal prompts operation irregularity, it is necessary to be set to user in time according to the analysis result of the data such as dead electricity time, suspension time
The standby warning message safeguarded.
The beneficial effects of the invention are as follows：Biogas leakage monitoring system based on NB-IoT realizes the data to biogas concentration
Collection monitoring is alarmed with leak condition.Master controller has automatic adjusument feedback mechanism, can be dense according to live methane biogas
The time interval of degree regulation CH_4 detection module detection methane concentration, i.e., detect first when concentration is normal according to Fixed Time Interval
Alkane concentration, when live methane concentration, which is begun to ramp up, reaches first order alarm threshold value, start to reduce the time of detection methane concentration
Interval and the time interval that methane concentration data and state are reported by NB wireless transport modules, more timely grasp the dense of scene
Degree situation and send alarm in time；When methane concentration reaches second level alarm threshold value, further reduce by two time intervals, simultaneously
Sound and light alarm module is started working, and by reporting Internet of Things cloud platform, is notified director in time, taken measures in time, is protected
Field Force's safety and property safety；When methane concentration exceedes third level alarm threshold value, methane concentration reports cloud to put down close to LEL
Platform has the danger exploded, and sound and light alarm module sends peak power alarm, and warning Field Force withdraws, and ensures Field Force
Safety；Internet of Things cloud platform can send instructions down, set the concentration of the three-level alarm threshold value inside main controller, while synchronous master control
The device time；The data such as dead electricity time, suspension time are contained in the data for report cloud platform, Internet of Things cloud platform can basis
These data judge the working condition of system, are safeguarded in time, keep system long-time normal operation, reduce monitoring alarm
The improper hidden danger brought of maintenance of equipment.When safeguarding, master controller, NB wireless transport modules, biogas concentration detection module are equal
Using pluggable form, can a removable parts damage part, it is convenient and swift, it is cost-effective.
Brief description of the drawings
Fig. 1 is the system architecture diagram of the present invention；
Fig. 2 is the main controller automatic adjusument schematic diagram of the present invention；
Fig. 3 is the circuit board demountable structure schematic diagram of the present invention；
Fig. 4 is the circuit diagram of the NB-IoT modules of the present invention；
Fig. 5 is the circuit diagram of the master controller of the present invention；
Fig. 6, Fig. 7 are the circuit diagrams of the power module of the present invention；
Fig. 8 is the circuit diagram of the methane concentration detection module of the present invention.
Embodiment
The present invention is further illustrated with specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of biogas leakage monitoring system based on NB-IoT provided by the invention, including methane concentration inspection
Survey module, master controller, display module, audible-visual annunciator module, power module, NB wireless transport modules, Internet of Things cloud platform
With user terminal；
Methane concentration detection module uses import infrared type sensing methane concentration device, measurable 0-100%LEL, and precision reaches
0.1%LEL, operating current 15mA, it is low in energy consumption, communicated using UART；Designed, can be passed by plugging to change using common bottom plate
Sensor, it is easy to later maintenance, and reserved analog quantity coffret, other models of communication interface for simulation output can be used
Sensor, there is certain versatility；
Master controller receives methane concentration data, and compared with the three-level alarm threshold value set, hence into not
Same detection state, and send alarm.The system sets three-level to alarm altogether, when entering lowermost level alarm threshold value, in display mould
Alarm and reminding is shown on block, while reduces the interval of methane concentration detection and state reporting, increases real-time, ensures letting out
State is grasped during dew in time.During into second level alarm threshold value, sound and light alarm module work, increase Concentration Testing real-time and
On call time, platform of internet of things receives to notify user terminal alarm after data, and notice is related responsible in time.Methane concentration exceedes
During third level alarm threshold value, the alarm sound of sound and light alarm module is maximum, prompts have explosion danger, personnel on the scene should withdraw.
Display module uses the 65*132 dot matrix LCD display screens of serial port, and concentration data is clearly showed that with large print, and
Display alarm state and networking state.
Audible-visual annunciator module uses explosion-proof audible-visual annunciator of the explosive-proof grade for ExdllCT6Gb, has super bright luminous
Pipe, maximum acoustic reach 100db, range of light intensity 1800-2400mcd, 1 second/time of frequency；
NB wireless transport modules contain NB modules and ipex antenna pedestals, and NB modules are led to by UART mouths with master controller
Letter.It is activated after receiving the packet of master controller, working condition is switched to from resting state, the packet received is sent
To Internet of Things cloud platform；Receive and parse through the user instruction data that Internet of Things cloud platform issues；
When Internet of Things cloud platform receives packet, packet is verified and identified first, filter illegal data
Bao Wen；Valid data are parsed in legal packet and are stored the data in Internet of Things cloud platform, at the same can according to
Family requires to push to valid data into the data server and user terminal of user；Internet of Things cloud platform can also receive user's end
The user instruction sent is held, user instruction is issued to NB modules.
As shown in Fig. 2 adaptive feedback regulation built in main controller of the present invention, the biogas concentration arrived according to Site Detection is adjusted
The detection frequency of biogas concentration detection module, ensure the real-time of concentration data, send alarm in time；It is dense that main controller receives methane
After degrees of data, compared with Multi-stage alarming threshold value, hence into different detection states, so as to realize automatic adjusument；This
System sets three-level to alarm altogether, when entering lowermost level alarm threshold value, alarm and reminding is shown on display module, while reduce first
The interval of alkane Concentration Testing and state reporting, increase real-time, ensure to obtain state in time when revealing.Into the second level
During alarm threshold value, sound and light alarm module work, the real-time and further shortening for increasing Concentration Testing reports interval, and Internet of Things is put down
Platform receives time of fire alarming and alarm condition, notice user terminal alarm, notifies related personnel in time.Methane concentration exceedes the third level
During alarm threshold value, the alarm sound of sound and light alarm module is maximum, prompts have explosion danger, personnel on the scene withdraw.
As shown in figure 3, the present invention has been combined into holonomic system by the way of multilayer circuit board patches, it is divided into master controller
And display daughter board, power supply daughter board, NB are wirelessly transferred daughter board, sensor daughter board.Wherein the interface of sound and light alarm module is in power supply
On plate.Sensor daughter board employs universality design, can change methane transducer by plugging.Pluggable between daughter board so that
The later maintenance and replacing of design become more flexibly, to be adapted to a variety of conditions environmentals, are only needed when changing demand
A certain or a few individual daughter boards are changed, without re-replacing all parts.
As shown in figure 4, the present invention uses network communication equipment as NB-IoT modules.Module model BC95-CM:B8.Mould
Worked under 3.1~4.2V of group wide-voltage range.Operating current as little as 10uA under module resting state, realize the letter of data communication
Number sensitivity can as little as -135dBm, greatly increase the communication range of module.Module possesses two UART interfaces and an ADC
Interface, the two-way communication and the firmware upgrade of module that UART interface is used between module and master controller.ADC interface can be used for system
Electric quantity monitoring.BC95-CM:B8 supports 900MHz frequency ranges, by mobile cellular network technology core network access, then through route,
Fire wall is connected with public network.Realize the two-way communication of device end and cloud platform.In circuit connection, ipex antenna pedestals are by surveying
The radio-frequency antenna interface of resistance R1 access BC95 modules is tried, to avoid disturbing and facilitating test, adds two groups of ground connection of C1 and C6
Electric capacity pad.Electric capacity C2, C3, C4 and C5 are the decoupling capacitance and shunt capacitance for maintaining BC95 power-supply systems stable.BC95 moulds
The enable port of group is connected to master controller by resistance R2, master controller is opened or closed BC95 modules.BC95 moulds
The main serial ports of group connects the serial ports of master controller by resistance R6, R8 with receiving terminal grounding resistance R9.
As shown in figure 5, master controller is the low-power consumption microcontroller STM32F302CC of ST Microelectronics；Microcontroller
Device is based on Cortex-M4 kernels, FLASH and 40KB of the microcontroller with 16MB SRAM, and electric current is as little as under park mode
30uA；Operating voltage range is 2.3~3.6V；The peripheral circuit of master controller is by clock circuit, reset circuit, power conversion electricity
Road forms；System clock includes high frequency clock and RTC clock, and high frequency clock is produced by 16MHz, when RTC clock is by 32.768KHz
Clock produces；On master controller after electricity, hardware interface is initialized first, completes the configuration of serial port baud rate and check bit；
Then NB modules are configured, activation NB modules enter working condition, search for NB network signals, and complete into net operation；NB
After module access network, master controller starts to perform the cloud platform operation of connection Internet of Things, the thing for specifying NB module accessing users
Networking cloud platform；NB modules are connected to Internet of Things cloud platform and send checking information, thing when being proved to be successful to Internet of Things cloud platform
Networking cloud platform, which issues to verify, successfully to be instructed；
Master controller sets three-level methane concentration alarm threshold value and reading frequency after receiving verification success message, and starts to read
The data of methane concentration are taken, while by concentration data compared with three-level alarm threshold value, the frequency of regulation methane concentration collection,
Control audible-visual annunciator is alarmed；Complete packet text is generated according to the communication protocol requirements of NB modules；Master controller leads to
Cross UART interface and complete packet be sent to after NB modules and enter resting state, wait next time RTC alarm clocks wake up or
UART interrupt instructions wake up；When master controller in a dormant state when, the instruction that user issues is issued to by Internet of Things cloud platform
NB modules；NB modules completely receive the decoding effort of instruction, and effective instruction data are sent to master controller UART；Main control
Device is activated, analysis instruction data, obtains user instruction and order is responded and response；In circuit side connector face, use
The power supply pin that CR1220 battery trays access master controller by Current Limiting Diodes D5 is powered for RTC clock, in access direct current
When the 3.3V voltages that can also be obtained by external power supply by level conversion power supply pin accessed by Current Limiting Diodes D6 entered
Row power supply.Reset switch RST is connected to the low level reset pin of master controller, and when switch is pressed, level step-down, makes master control
Device processed resets.FLASH memory is connected by SPI interface with master controller, and pull-up resistor R30 connects power supply, bypass electricity with R29
Hold C28 with being connected to power supply.The second serial USART2_TX of master controller connects sensing methane concentration device with USART2_RX, warp
The enabled pin that resistance R26 is pulled upward to the main controller controlling switch connection BC95 modules of power supply is crossed, control BC95 is opened and closed.
10 parallel output pins of master controller are connected to display module, wherein output of 8 pins as display information data, its
His 2 pins each serve as the effect chosen and enabled, and the output pin connection sound and light alarm module of master controller, are needing to report
Sound and light alarm module is opened when alert.
As shown in Figure 6 and Figure 7, power module 24V input voltages directly feed audible-visual annunciator, by 24V input power
5V and 3.3V are depressured to, wherein 3.3V powers for methane concentration detection module, and it is master controller that 5V is depressured to 3.3V and 3.8V again
Working power is provided with NB modules.
As shown in figure 8, methane concentration detection module is communicated using UART；Designed using common bottom plate, can be by plugging more
Methane transducer is changed, is easy to the later maintenance of system, and reserved analog quantity coffret, communication interface can be used as simulation
Other model sensors of output, have certain versatility；
The specific implementation process of the present invention is as follows：Build and said system is installed, after system electrification, observed by display screen
Biogas concentration information and equipment networking state.Concentration data is uploaded to Internet of Things cloud platform, can on map real-time display it is each
The biogas concentration information and alarm condition of point, send out alarm threshold value above and below platform, as concentration can be lifted close to threshold value, main controller
The frequency of detectable concentration and the frequency of reported data, when biogas concentration exceeds alarm threshold value at the scene, audible-visual annunciator will be sent
Strong light and alarm, remind personnel on the scene to reveal.Platform is revealed by setting the contact method of the people of alert notice
Shi Tongzhi related personnel.
Claims (5)
- A kind of 1. biogas leakage monitoring system based on NB-IoT, it is characterised in that：The system include methane concentration detection module, Master controller, display module, audible-visual annunciator module, power module, NB wireless transport modules, Internet of Things cloud platform and user are whole End；The methane concentration detection module uses infrared type sensing methane concentration device, is communicated using UART；Set using common bottom plate Meter, analog quantity coffret can be reserved by plugging more emat sensor；Automatic adjusument feedback mechanism built in the master controller, biogas concentration can be adjusted according to the biogas concentration that Site Detection arrives The detection frequency of detection module, ensure the real-time of concentration data, send alarm in time；Main controller detection methane concentration detection mould Block collection methane concentration data time interval, and main controller transmission methane concentration data and status alert information to NB without The time interval of line transport module, determine, master controller receives NB and is wirelessly transferred mould all in accordance with the live biogas concentration detected The Internet of Things cloud platform of block transmission is instructed to set three-level alarm threshold value, and the live biogas that methane concentration detection module is gathered is dense Degree adjusts above-mentioned two time interval according to relative size compared with three-level alarm threshold value, into different detections State, alarm is sent, record alarm condition and time of fire alarming, and NB wireless transport modules are provided and report cloud platform, realized adaptive It should adjust, be specially：When methane concentration is in normal range (NR), methane concentration detection module and NB wireless transport modules difference Cloud platform is uploaded to fixed frequency；When methane concentration exceedes lowermost level alarm threshold value, alarm is shown on display module Remind, while adjust the time interval of methane concentration detection module detection methane concentration, and transmission methane concentration data and band There is the time interval of the status information of first order alarm, the frequency detected by increasing methane concentration, reduce methane concentration information The interval reported with alarm condition, increase system obtain the real-time of field data, ensure to obtain shape in time when revealing State；When methane concentration exceedes second level alarm threshold value, sound and light alarm module is opened immediately, adjusts two time intervals, further Increase the detection frequency of methane concentration detection module, shortening reports interval, when increasing the real-time of Concentration Testing, while will alarm Between and with the second level alarm status information Internet of Things cloud platform, Internet of Things cloud platform are transferred to by NB wireless transport modules User terminal alarm is notified, notifies related personnel in time；When methane concentration exceedes third level alarm threshold value, it may occur however that blast, The alarm sound of sound and light alarm module is maximum, and there is explosion danger at prompting scene, and personnel on the scene withdraw；The display module uses LCD display, there is backlight, and concentration data, and display alarm shape are clearly showed that with large print State and networking state；The audible-visual annunciator module uses explosion-proof audible-visual annunciator of the explosive-proof grade for ExdllCT6Gb, has super bright luminous Pipe, the maximum sound intensity reach 100db, range of light intensity 1800-2400mcd, 1 second/time of frequency；The NB wireless transport modules include NB modules and ipex antenna pedestals, and NB modules are communicated by UART mouths with master controller； It is activated after receiving the packet of master controller, working condition is switched to from resting state, the packet received is sent to Internet of Things cloud platform；Receive and parse through the user instruction data that Internet of Things cloud platform issues；When the Internet of Things cloud platform receives the packet of NB wireless transport modules transmission, packet is verified and known first Not, illegal packet text is filtered；Valid data are parsed in legal packet and store the data to Internet of Things cloud On platform, while it can be required to push to valid data into the data server and user terminal of user according to user；Internet of Things cloud Platform can also receive the user instruction of user terminal transmission, and user instruction is issued into NB modules.
- A kind of 2. biogas leakage monitoring system based on NB-IoT according to claim 1, it is characterised in that：The master control Device processed is the low-power consumption microcontroller STM32F302CC of ST Microelectronics；Microcontroller is based on Cortex-M4 kernels, micro- FLASH and 40KB of the controller with 16MB SRAM, electric current as little as 30uA under park mode；Operating voltage range be 2.3~ 3.6V；The peripheral circuit of master controller is made up of clock circuit, reset circuit, power-converting circuit；System clock includes high frequency Clock and RTC clock, high frequency clock are produced by 16MHz, and RTC clock is produced by 32.768KHz clocks；Power module 24V is inputted Voltage directly feeds audible-visual annunciator module, 24V input power is depressured into 5V and 3.3V, wherein 3.3V examines for methane concentration Module for power supply is surveyed, 5V is depressured to 3.3V and 3.8V and provides working power for master controller and NB modules again.
- A kind of 3. biogas leakage monitoring system based on NB-IoT according to claim 1, it is characterised in that：Master controller After upper electricity, hardware interface is initialized first, completes the configuration of serial port baud rate and check bit；Then NB modules are carried out Configuration, activation NB modules enter working condition, search for NB network signals, and complete into net operation；It is main after NB modules access network Controller starts to perform the cloud platform operation of connection Internet of Things, the Internet of Things cloud platform for specifying NB module accessing users；NB modules It is connected to Internet of Things cloud platform and sends checking information to Internet of Things cloud platform, Internet of Things cloud platform issues verification when being proved to be successful Success instructs；After master controller receives verification success message, timer is started working, and it is dense to start acquisition methane after each timers trigger Spend the concentration data of detection module, and concentration data sent to display module and shown, at the same methane concentration data and The three-level methane concentration threshold value of storage is compared, and judges whether to alarm, if starts automatic adjusument mechanism；Afterwards concentration Data and warning message with alert levels, which are sent to NB wireless transport modules, is uploaded to Internet of Things cloud platform；Master controller is same When receive the instruction that cloud platform issues, obtain IP address after parsing, carry out the checking of IP address, the identity for carrying out cloud platform is tested Card, cloud platform can set the frequency of methane concentration detection module simultaneously, set three-level methane concentration alarm threshold value；Cloud platform is same When correction is synchronized to time of master controller；Complete packet text is generated according to the communication protocol requirements of NB modules；It is main Complete packet is sent to after NB modules by controller by UART interface enters resting state, waits RTC alarm clocks next time Wake up or UART interrupt instructions wake up；When master controller in a dormant state when, the instruction that user issues is by Internet of Things cloud platform It is issued to NB modules；NB modules completely receive the decoding effort of instruction, and effective instruction data are sent to master controller UART； Master controller is activated, analysis instruction data, obtains user instruction and order is responded and response.
- A kind of 4. biogas leakage monitoring system based on NB-IoT according to claim 1, it is characterised in that：The NB moulds Group is BC95-CM:B8, module normal working voltage scope are 3.1~4.2V, operating current as little as 10uA under resting state；NB Module realizes the signal sensitivity as little as -135dBm of data communication；NB modules possess two UART interfaces and an ADC interface, The two-way communication that UART interface is used between NB modules and master controller and the firmware upgrade of NB modules, ADC interface are used for system electricity Amount monitoring；BC95-CM:B8 supports 900MHz frequency ranges, by mobile cellular network technology core network access, then through routeing, preventing Wall with flues is connected with public network.
- A kind of 5. biogas leak detection systems based on NB-IoT according to claim 1, it is characterised in that：User terminal The data of methane concentration detection module collection are obtained from the data server of Internet of Things cloud platform or user, and are put down in Internet of Things cloud Platform realizes the monitoring and analysis to the methane concentration data of different location；User terminal can to three-level methane concentration alarm threshold value, Sample frequency and alarm means are configured；And time of fire alarming and the record of concentration are inquired about, when the live master control arranged in system There are abnormal conditions in device processed, methane concentration detection module or NB wireless transport modules, when user terminal is according to dead electricity time, suspension Between etc. data analysis result in time to user prompt operation irregularity, it is necessary to carry out the warning message of plant maintenance.
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