CN112554954A - Remote monitoring system for gas in operation tunnel and gas gathering control method - Google Patents
Remote monitoring system for gas in operation tunnel and gas gathering control method Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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- E—FIXED CONSTRUCTIONS
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Abstract
The invention relates to a remote gas monitoring system and a gas gathering control method for an operating tunnel, and belongs to the technical field of gas control of operating tunnels. The invention discloses a remote monitoring system for operating tunnel gas and a gas gathering prevention method for operating tunnels, wherein the remote monitoring system comprises a monitoring substation, a ventilation system, a monitoring host and a monitoring center, and gas monitoring is carried out by camping on the remote monitoring system for tunnel gas, namely, the gas concentration conditions in tunnels are gathered to a monitoring switchboard through the monitoring substation, and the ventilation system running state in tunnels is automatically controlled by the monitoring switchboard, so that gas disasters caused by gas gathering in tunnels are prevented; meanwhile, the monitoring center is alarmed through the monitoring switchboard, the passing state of the tunnel is regulated and controlled by monitoring personnel, the vehicle is prevented from entering the tunnel to cause accidents, and the tunnel operation safety is comprehensively guaranteed.
Description
Technical Field
The invention belongs to the technical field of gas prevention and control of an operation tunnel, and particularly relates to a gas remote monitoring system and a gas gathering prevention and control method for the operation tunnel.
Background art
In recent years, the infrastructure construction of China gradually shifts to western mountainous areas, the western mountainous areas build high-grade roads in a large scale, and mountain-crossing tunnels are important components for building roads and railways in the western mountainous areas. Provinces such as Guizhou, Sichuan and Chongqing are important coal production bases in China, mountain-through tunnels in the regions are inevitably required to penetrate through coal strata, and coal seams in the regions have high gas content, high pressure and serious gas disasters. In the tunnel operation process, gas can not be prevented from flowing into the tunnel from the tunnel lining cracks, and the gas operation tunnel is gathered at certain parts of the tunnel, so that gas explosion accidents are easily caused, and the tunnel operation safety is seriously influenced.
The explosion or combustion of the gas has three conditions, namely the gas concentration (when the gas concentration in the air reaches 5-16%); secondly, sufficient oxygen environment (explosion and combustion can occur when the oxygen concentration in the air is more than 12%); thirdly, an ignition source (the ignition temperature of the gas is 650-750 ℃). In the operation tunnel, the air concentration is constant; the smoke discharged by insufficient combustion of gasoline (diesel) of the past vehicle often contains sparks or high temperature, and electric sparks are generated in the running process of a vehicle circuit. And if the gas concentration in the tunnel is in a combustion or explosion range (the gas concentration in the air reaches 5-16%), the gas disaster is easily caused.
At present, methods for monitoring and controlling gas concentration and preventing and controlling gas disasters in the construction period of a tunnel penetrating through a coal-based stratum are mature, but researches for monitoring and controlling gas concentration and preventing and controlling in the tunnel in the operation period are relatively lacked. Therefore, effective monitoring and timely treatment of the gas in the operating tunnel is a key for preventing and controlling the gas disaster of the operating tunnel and guaranteeing the operation safety of the tunnel, so that deep research needs to be carried out on the remote monitoring system and the gas gathering prevention and control method for the gas in the operating tunnel.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a remote monitoring system for operating tunnel gas; the second purpose of the invention is to provide a method for preventing and controlling gas accumulation in an operating tunnel.
In order to achieve the purpose, the invention provides the following technical scheme:
1. a remote monitoring system for operating tunnel gas comprises a monitoring substation, a ventilation system, a monitoring host and a monitoring center;
the monitoring substation, the ventilation system and the monitoring host are mutually connected, and the monitoring host is connected with the monitoring center.
Preferably, the monitoring substation is composed of a gas sensor, an air speed sensor and a video monitor.
Preferably, the output ends of the gas sensor, the wind speed sensor and the video monitoring are connected with the input end of the monitoring substation.
Further preferably, the monitoring host consists of a central control computer, a UPS power supply and a power supply lightning arrester.
Further preferably, the UPS power supply provides uninterruptible power for the system.
Further preferably, the power arrester protects the UPS power supply from lightning strikes.
Further preferably, the monitoring host is provided with a control program of a first fuzzy intelligent controller and a control program of a second fuzzy intelligent controller.
Preferably, the monitoring center consists of an alarm system, a display system, an output system and a manual control system.
Preferably, the output end of the monitoring substation is connected with the input end of the monitoring host.
Preferably, the output end of the monitoring host is connected with the input ends of an alarm system, a display system and an output system of the monitoring center.
Further preferably, the output end of the manual control system of the monitoring center is connected with the input end of the monitoring host.
Further preferably, the gas sensor, the wind speed sensor and the video monitor are installed at the inlet and the outlet of the operation tunnel and in the middle of the operation tunnel.
Preferably, the installation height of the gas sensor is 20cm away from the vault of the operating tunnel.
Preferably, the ventilation system consists of a jet fan and a frequency converter.
2. A method for preventing and controlling gas gathering in an operating tunnel adopts the remote monitoring system in the process of the method, and the specific method is as follows:
(1) monitoring the gas concentration, the gas gathering position, the wind speed and the wind direction in the tunnel through the monitoring substation, and then transmitting the detection result to the monitoring host;
(2) the monitoring host machine judges the gas concentration, the gas gathering position, the wind speed and the wind direction in the tunnel,
if the gas concentration value exceeds the upper limit value of the gas concentration set by the monitoring host, the monitoring host controls the monitoring center to alarm, display or output, meanwhile, the monitoring host controls the first fuzzy intelligent controller to calculate and process the received gas concentration and output a control frequency signal obtained after calculation to the jet flow fan, the jet flow fan changes the operating frequency according to the control frequency signal until the gas concentration value is lower than the upper limit value set by the central control computer,
if the gas concentration value does not exceed the upper limit value of the gas concentration set by the monitoring host, the monitoring host calculates a wind speed value required by the tunnel under the current gas concentration, if the wind speed value required by the tunnel is greater than the wind speed value in the tunnel, the monitoring host controls the monitoring center to give an alarm, display or output, meanwhile, the monitoring host controls the second fuzzy intelligent controller to calculate and process the received wind speed value of the tunnel, the second fuzzy intelligent controller outputs a control frequency signal obtained after calculation to the jet flow fan, and the jet flow fan changes the operation frequency according to the control frequency signal until the wind speed value in the tunnel is greater than or equal to the wind speed value required by the tunnel.
Preferably, the upper limit value of the gas concentration in the step (2) is 0.5%.
The invention has the beneficial effects that: the invention discloses a remote monitoring system for operating tunnel gas and a gas gathering prevention method for operating tunnels, wherein the remote monitoring system comprises a monitoring substation, a ventilation system, a monitoring host and a monitoring center, and gas monitoring is carried out by camping on the remote monitoring system for tunnel gas, namely, the gas concentration conditions in tunnels are gathered to a monitoring switchboard through the monitoring substation, and the ventilation system running state in tunnels is automatically controlled by the monitoring switchboard, so that gas disasters caused by gas gathering in tunnels are prevented; meanwhile, the monitoring center is alarmed through the monitoring switchboard, the passing state of the tunnel is regulated and controlled by monitoring personnel, the vehicle is prevented from entering the tunnel to cause accidents, and the tunnel operation safety is comprehensively guaranteed.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
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For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
fig. 1 is a remote monitoring system for operating tunnel gas in embodiment 1;
FIG. 2 is a diagram showing the principle and calculation processing of the fuzzy intelligent controller in embodiment 1;
FIG. 3 is a flow chart for adjusting the jet fan based on system monitoring results.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that, in the following embodiments, features in the embodiments may be combined with each other without conflict.
Example 1
A remote monitoring system for operating tunnel gas is shown in figure 1, wherein the remote monitoring system comprises a monitoring substation, a ventilation system, a monitoring host and a monitoring center. In the system, the monitoring substation, the ventilation system and the monitoring host are mutually connected, and the monitoring host is connected with the monitoring center.
The monitoring substation consists of a gas sensor, an air speed sensor and a video monitor which are arranged at the inlet, the outlet and the middle part of the operation tunnel; meanwhile, as the gas density is smaller than that of air, the installation height of the gas sensor needs to be set to be 20cm away from the vault of the operation tunnel; the output ends of the gas sensor, the wind speed sensor and the video monitoring are connected with the input end of the monitoring substation, so that the gas concentration detected by the gas sensor in the system, the wind speed and the wind direction in the tunnel detected by the wind speed sensor and the gas gathering position detected by the video monitoring are transmitted to the monitoring host for calculation and analysis.
The monitoring host consists of a central control computer, a UPS power supply and a power supply lightning arrester, wherein the central control computer compares the received parameters such as gas concentration, gas gathering position, wind speed and wind direction in the tunnel with the upper limit value of the gas concentration set by the central control computer so as to further determine the subsequent operation of the system; the UPS is used for continuously and stably supplying power to the whole monitoring system in an uninterrupted manner; the lightning arrester of the power supply is used for ensuring that the UPS is not struck by lightning. In addition, a control program of a first fuzzy intelligent controller and a control program of a second fuzzy intelligent controller are arranged in the monitoring host.
The monitoring center consists of an alarm system, a display system, an output system and a manual control system, wherein the alarm system can give an alarm according to the judgment result of the monitoring host; the display system displays the adjustment parameters calculated by the monitoring host computer and needed for prevention and treatment; the output system and the manual control system are operated manually according to the existing parameters, so that the output system feeds back the monitoring host.
The output end of the monitoring substation is connected with the input end of the monitoring host; the output end of the monitoring host is connected with the input ends of an alarm system, a display system and an output system of the monitoring center; the output end of the manual control system of the monitoring center is connected with the input end of the monitoring host.
The ventilation system consists of a jet fan and a frequency converter.
The electrical equipment and cables which are arranged in the tunnel, such as the gas sensor, the wind speed sensor, the jet fan, the video monitoring and the like, have an explosion-proof function.
Example 2
A method for preventing and controlling gas gathering of an operating tunnel adopts the operating tunnel gas remote monitoring system in the embodiment 1 to perform prevention and control, and the specific method is as follows:
(1) monitor gas concentration, gas gathering position, wind speed and wind direction in the tunnel through monitoring the substation, then transmit the result of detecting to the monitoring host computer, specifically do:
the substation gas sensor monitoring system comprises a monitoring station substation gas sensor, an air speed sensor, a video monitoring device, a control host and a monitoring host, wherein the monitoring station substation gas sensor is installed at an inlet and an outlet of an operation tunnel to be prevented and an intermediate position of the operation tunnel, the installation height of the gas sensor is set to be 20cm away from the vault of the operation tunnel, the gas concentration in the operation tunnel to be prevented and controlled is treated through the gas sensor, the air speed and the air direction in the operation tunnel to be prevented and controlled are treated through the air speed sensor, the gas gathering position in the operation tunnel to be prevented and controlled is monitored and detected through the video monitoring device, and the detected result is transmitted to the monitoring host through.
(2) The monitoring host computer judges gas concentration, gas gathering position, wind speed and wind direction in the tunnel, specifically is:
firstly, according to the explosion or combustion condition of the gas and the detected parameters of the gas gathering position, the wind speed and the wind direction in the tunnel, the upper limit value (generally 0.5%) of the gas concentration allowed in the operation tunnel to be prevented and controlled is determined and input into a central control computer (PLC) of a monitoring host, the detected gas concentration and the upper limit value of the gas concentration are compared and judged in the central control computer, and the following operations are respectively carried out according to different results:
if the received gas concentration value exceeds the upper limit value of the gas concentration set in a central control computer in the monitoring host, the monitoring host alarms through an alarm system of the monitoring center, displays the gas over-limit position, the gas concentration value, the ventilation air speed in the tunnel, the air direction and the field video monitoring condition through a display system of the monitoring center, controls a first fuzzy intelligent controller to calculate and process the received gas concentration and outputs a control frequency signal obtained after calculation to a jet fan, the jet fan changes the operation frequency according to the control frequency signal until the gas concentration value is lower than the upper limit value set by the central control computer, the alarm system stops alarming, and the jet fan returns to the normal operation state;
if the gas concentration value does not exceed the upper limit value of the gas concentration set in the central control computer in the monitoring host, the central control computer of the monitoring host calculates the wind speed value required by the tunnel under the current gas concentration, if the wind speed value required by the tunnel is greater than the wind speed value in the tunnel, the monitoring host gives an alarm through an alarm system of the monitoring center and displays the relevant wind speed value through a display system of the monitoring center, meanwhile, the monitoring host controls a second fuzzy intelligent controller to calculate and process the received wind speed value of the tunnel, the second fuzzy intelligent controller outputs a control frequency signal obtained after calculation to the jet flow fan, the jet flow fan changes the operating frequency according to the control frequency signal until the wind speed value in the tunnel is greater than or equal to the wind speed value required by the tunnel, and the jet flow fan restores to a;
in addition, if the system cannot effectively reduce the gas concentration in the tunnel through the central control computer and the jet fan, workers in the monitoring center can adjust a ventilation system of the operation tunnel to be prevented and controlled through a manual control system of the monitoring center until the gas concentration is reduced to be within a safe concentration range, and then an alarm signal is removed; if the manual control system cannot effectively reduce the gas concentration in the tunnel, the monitoring center staff should start an emergency plan to control the tunnel passing state, prohibit vehicles from entering the tunnel, close non-explosion-proof electromechanical equipment in the tunnel, prevent the vehicles or the electromechanical equipment from generating ignition sources, and prevent gas combustion or gas explosion disasters.
Principle and computational process of fuzzy intelligent controller (as shown in fig. 2): and establishing a fuzzy intelligent controller with two inputs and three outputs. The input of the first fuzzy intelligent controller is the deviation e (k) of the gas concentration and the deviation change rate ec(k) (model initialization step, according to the gas concentration obtained by current detection and the gas concentration value preset by the first fuzzy intelligent controller, the central control computer (PLC) calculates the deviation e (k) and deviation change rate e of the gas concentrationc(k) The input of the second fuzzy intelligent controller is the deviation e (k) of the wind speed and the deviation change rate ec(k) (model initialization step, calculating the deviation e (k) and deviation change rate e of wind speed according to the wind speed required by the tunnelc(k) According to fuzzy rules in a database existing in the system, the outputs of the first fuzzy intelligent controller and the second fuzzy intelligent controller are PID parameters Kp、KiAnd KdAnd then the size of output data is adjusted in a self-adaptive manner according to a PID (proportion integration differentiation) (controller), the output frequency of a frequency converter power supply of the jet flow fan is changed to adjust and control the running state of the fan, and the gas concentration in the tunnel is ensured to be within an allowable range.
Parameter Kp、KiAnd KdWith deviations e (k) and deviationsRate of change ec(k) The fuzzy relationship between them can be calculated by the following formula:
wherein u (n) -the control quantity output by the controller at the nth sampling time;
e (n) -the deviation value at the nth sampling;
Kp-a proportional gain;
Ki-an integral gain;
Kd-a differential gain;
the flow chart for adjusting the jet fan according to the system monitoring result is shown in fig. 3.
In summary, the invention discloses an operation tunnel gas remote monitoring system and an operation tunnel gas gathering prevention method, the remote monitoring system comprises a monitoring substation, a ventilation system, a monitoring host and a monitoring center, and gas monitoring is carried out through the operation tunnel gas remote monitoring system, namely, the gas concentration condition in a tunnel is gathered to a monitoring switchboard through the monitoring substation, and the operation state of the ventilation system in the tunnel is automatically monitored by the monitoring switchboard, so that gas disaster caused by gas gathering in the tunnel is prevented; meanwhile, the monitoring center is alarmed through the monitoring switchboard, the passing state of the tunnel is regulated and controlled by monitoring personnel, the vehicle is prevented from entering the tunnel to cause accidents, and the tunnel operation safety is comprehensively guaranteed.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A remote monitoring system for operating tunnel gas is characterized by comprising a monitoring substation, a ventilation system, a monitoring host and a monitoring center;
the monitoring substation, the ventilation system and the monitoring host are mutually connected, and the monitoring host is connected with the monitoring center.
2. The remote monitoring system according to claim 1, wherein the monitoring substation is composed of a gas sensor, an air velocity sensor and a video monitor;
and the output ends of the gas sensor, the wind speed sensor and the video monitoring are connected with the input end of the monitoring substation.
3. The remote monitoring system according to claim 2, wherein the monitoring host is composed of a central control computer, a UPS power supply and a power lightning arrester;
the UPS supplies power to the system uninterruptedly;
the power supply lightning arrester protects the UPS from being influenced by lightning stroke;
and a control program of a first fuzzy intelligent controller and a control program of a second fuzzy intelligent controller are arranged in the monitoring host.
4. The remote monitoring system according to claim 3, wherein the monitoring center is composed of an alarm system, a display system, an output system and a manual control system.
5. The remote monitoring system according to claim 4, wherein the output of the monitoring substation is connected to the input of a monitoring host;
the output end of the monitoring host is connected with the input ends of an alarm system, a display system and an output system of the monitoring center;
and the output end of the manual control system of the monitoring center is connected with the input end of the monitoring host.
6. The remote monitoring system according to claim 2, wherein the gas sensor, the wind speed sensor and the video monitor are installed at the entrance and exit of the operation tunnel and in the middle of the operation tunnel.
7. The remote monitoring system according to claim 6, wherein the installation height of the gas sensor is 20cm from the vault of the operating tunnel.
8. The remote monitoring system according to claim 1, wherein the ventilation system is composed of a jet fan and a frequency converter.
9. A method for preventing and controlling gas gathering in an operating tunnel is characterized in that a remote monitoring system according to any one of claims 1-7 is adopted in the process of the method, and the method comprises the following steps:
(1) monitoring the gas concentration, the gas gathering position, the wind speed and the wind direction in the tunnel through the monitoring substation, and then transmitting the detection result to the monitoring host;
(2) the monitoring host machine judges the gas concentration, the gas gathering position, the wind speed and the wind direction in the tunnel,
if the gas concentration value exceeds the upper limit value of the gas concentration set by the monitoring host, the monitoring host controls the monitoring center to alarm, display or output, meanwhile, the monitoring host controls the first fuzzy intelligent controller to calculate and process the received gas concentration and output a control frequency signal obtained after calculation to the jet flow fan, the jet flow fan changes the operating frequency according to the control frequency signal until the gas concentration value is lower than the upper limit value set by the central control computer,
if the gas concentration value does not exceed the upper limit value of the gas concentration set by the monitoring host, the monitoring host calculates a wind speed value required by the tunnel under the current gas concentration, if the wind speed value required by the tunnel is greater than the wind speed value in the tunnel, the monitoring host controls the monitoring center to give an alarm, display or output, meanwhile, the monitoring host controls the second fuzzy intelligent controller to calculate and process the received wind speed value of the tunnel, the second fuzzy intelligent controller outputs a control frequency signal obtained after calculation to the jet flow fan, and the jet flow fan changes the operation frequency according to the control frequency signal until the wind speed value in the tunnel is greater than or equal to the wind speed value required by the tunnel.
10. The control method according to claim 9, characterized in that the upper limit value of the gas concentration in step (2) is 0.5%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113236332A (en) * | 2021-06-24 | 2021-08-10 | 青海省交通建设管理有限公司 | System for monitoring and comprehensively treating toxic and harmful gas in coal-penetrating tunnel construction period |
| CN113356012A (en) * | 2021-06-25 | 2021-09-07 | 青海省交通建设管理有限公司 | Assembly type bridge structure in tunnel and construction method thereof |
| CN113702584A (en) * | 2021-08-26 | 2021-11-26 | 中电建铁路建设投资集团有限公司 | Method, system and device for remotely monitoring and alarming gas in tunnel construction process and computer readable storage medium |
| CN113982668A (en) * | 2021-10-22 | 2022-01-28 | 重庆交通大学 | Follow-up type system and method for pumping and exhausting harmful gas in tunnel |
-
2020
- 2020-12-23 CN CN202011539869.5A patent/CN112554954A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113236332A (en) * | 2021-06-24 | 2021-08-10 | 青海省交通建设管理有限公司 | System for monitoring and comprehensively treating toxic and harmful gas in coal-penetrating tunnel construction period |
| CN113356012A (en) * | 2021-06-25 | 2021-09-07 | 青海省交通建设管理有限公司 | Assembly type bridge structure in tunnel and construction method thereof |
| CN113702584A (en) * | 2021-08-26 | 2021-11-26 | 中电建铁路建设投资集团有限公司 | Method, system and device for remotely monitoring and alarming gas in tunnel construction process and computer readable storage medium |
| CN113982668A (en) * | 2021-10-22 | 2022-01-28 | 重庆交通大学 | Follow-up type system and method for pumping and exhausting harmful gas in tunnel |
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Inventor after: Cheng Liang Inventor after: Deng Xin Inventor after: Chen Hongwei Inventor after: Li Ke Inventor after: Cai Shuang Inventor after: Dong Zhengbo Inventor after: Jiang Xinghong Inventor after: Zhang Danfeng Inventor after: Wu Xiaoli Inventor after: Li Xingxing Inventor before: Cheng Liang Inventor before: Deng Xin Inventor before: Chen Hongwei Inventor before: Li Ke Inventor before: Cai Shuang Inventor before: Dong Zhengbo Inventor before: Jiang Xinghong Inventor before: Zhang Danfeng Inventor before: Wu Xiaoli Inventor before: Li Xingxing |
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