CN111894885A - Tunnel fan intelligent control system and control method - Google Patents
Tunnel fan intelligent control system and control method Download PDFInfo
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- CN111894885A CN111894885A CN202010763713.9A CN202010763713A CN111894885A CN 111894885 A CN111894885 A CN 111894885A CN 202010763713 A CN202010763713 A CN 202010763713A CN 111894885 A CN111894885 A CN 111894885A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000012544 monitoring process Methods 0.000 claims abstract description 51
- 231100000331 toxic Toxicity 0.000 claims abstract description 29
- 230000002588 toxic effect Effects 0.000 claims abstract description 29
- 238000009423 ventilation Methods 0.000 claims abstract description 18
- 238000004458 analytical method Methods 0.000 claims abstract description 7
- 238000012806 monitoring device Methods 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 54
- 239000000428 dust Substances 0.000 claims description 29
- 238000001514 detection method Methods 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- 239000001301 oxygen Substances 0.000 claims description 13
- 229910052760 oxygen Inorganic materials 0.000 claims description 13
- 230000007613 environmental effect Effects 0.000 claims description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 230000002159 abnormal effect Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 8
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 6
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 6
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 231100000614 poison Toxicity 0.000 claims description 4
- 230000007096 poisonous effect Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- 230000003203 everyday effect Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 230000001473 noxious effect Effects 0.000 claims description 2
- 238000009412 basement excavation Methods 0.000 abstract description 12
- 238000010276 construction Methods 0.000 abstract description 10
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- JCXJVPUVTGWSNB-UHFFFAOYSA-N Nitrogen dioxide Chemical compound O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/006—Ventilation at the working face of galleries or tunnels
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses an intelligent control system and a control method for a tunnel fan. The system consists of a CO/VI detector, a wind direction and wind speed detector, a fan control cabinet, a fan and a zone controller which are arranged in a tunnel; monitoring the gas state of the tunnel through a toxic and harmful gas concentration monitoring device arranged on the tunnel face of the excavated chamber, setting a standard value of harmful gas, feeding monitoring data back to a background intelligent analysis sensing module in real time, automatically starting a fan when the monitoring data is larger than a standard specified value, and selecting a starting gear and automatically shifting gears according to a harmful gas concentration monitoring value; by adopting the method and the structure, the intelligent control of the tunnel fan is realized, the problems of timely and effective ventilation and exhaust of the excavation working surface of the underground space are solved, and the construction safety guarantee of machinery and personnel is provided for the excavation of the underground space. The tunnel fan intelligent control method and system are simple to operate, high in reliability and strong in safety.
Description
Technical Field
The invention relates to an intelligent control system and a control method for a tunnel fan, which belong to the tunnel excavation safety design and construction technology, in particular to an operation system applied to the construction ventilation of an underground cavern group with large scale and complex construction procedures,
background
When the underground cavern crowd excavation that the scale is big, the construction procedure is complicated, the excavation working face produces a large amount of poisonous and harmful gas, and is dangerous very big, effective timely ventilation system of urgent needs, the effective timely discharge of a large amount of poisonous and harmful gas that produces the working face to possess emergency treatment's countermeasure, avoid appearing tunnel control system main equipment and break down and take place under the conflagration condition, the condition that the intelligent control system of fan became invalid, effectual guarantee underground space excavation safety.
In the existing tunnel ventilation system, an integral ventilation structure system is not formed, the gas concentration is not integrated and analyzed, the monitoring is not immediate, and the timely and effective ventilation can not be guaranteed. The safety of tunnel working face excavation personnel and the safety of construction machinery are seriously affected, so an effective intelligent monitoring and control method and an effective intelligent monitoring and control system for a tunnel fan are needed to ensure the working face excavation safety.
Disclosure of Invention
The invention aims to provide an intelligent control system and a control method for a tunnel fan, which solve the problems that a large amount of toxic and harmful gas is generated on the excavation working surface of an underground structure at present, and the safety of personnel and mechanical construction cannot be guaranteed.
The specific implementation scheme of the invention is as follows:
the tunnel fan intelligent control system is composed of a CO/VI detector, a wind direction and wind speed detector, a fan control cabinet, a fan and a zone controller which are arranged in a tunnel;
the CO/VI detector is used for monitoring and acquiring basic data of carbon monoxide and visibility in the tunnel, is arranged on a side wall of the tunnel, and is in signal connection with the data of the zone controller;
the wind direction and wind speed detector is used for monitoring and acquiring basic data such as wind speed and wind direction in the tunnel, an area and a position with data representativeness are selected for equipment installation, and the equipment is generally installed on the side wall of the tunnel and the face of an excavated chamber and is connected with a data signal of a region controller;
the fan control cabinet is used for controlling the running state of the fan, is arranged at the same position as the fan and controls the fan;
the fans are uniformly arranged in the tunnel at intervals, the distance between every two adjacent fans is 350m, and the fans are controlled to be opened and closed by the fan control cabinet;
the area controller is installed on the site of a tunnel protection area, is directly connected with the CO/VI detector, the wind direction detector and the wind speed detector, is used for processing various alarm information, and is also connected with an emergency alarm system.
The invention also discloses an intelligent control method of the tunnel fan, which adopts the intelligent control system of the tunnel fan, and the control method comprises the following steps:
s1, acquiring the concentration of toxic and harmful gases, the concentration of oxygen and the concentration of dust by a CO/VI detector, a wind direction and wind speed detector and the like, and feeding monitoring data back to a regional controller in real time; setting standard values of concentrations of harmful gases, oxygen and dust; the harmful gas comprises CO and CO2、NO2、SO2、H2S；
S2, the program or the staff judges whether the communication between the monitoring control system and the field control system is normal or not according to the monitoring control system, if the communication is normal, the program or the staff continuously judges whether the concentrations of toxic and harmful gases and dust generated on the working surface of the tunnel exceed the standards or not and whether the concentration of oxygen reaches the standards or not, if so, the program or the staff enters a step S3; if not, keeping the working state of the conventional ventilation fan in the tunnel; if the communication between the monitoring control system and the field control is abnormal, especially when the main equipment breaks down, the alarm information can immediately pop up an alarm dialog box. If the environmental change in the tunnel reaches the alarm condition or needs manual operation, the process goes to step S4; if not, keeping the working state of the conventional ventilation fan of the tunnel;
s3, if the monitoring control system is normally communicated with the field control system and the concentration of toxic and harmful gases and dust generated on the working surface of the tunnel exceeds the standard, sending the detection result into the monitoring system through a region controller, and calculating the change rate and the average value of the detection result according to the detection data; calculating according to a threshold return difference method to realize full-automatic control of the operation of the fan; when the state value exceeds the upper limit threshold value, starting the executing mechanism, and when the state value is smaller than the lower limit threshold value, closing the execution; selecting a starting gear and automatically shifting gears according to a real-time monitoring value of the concentration of the harmful gas;
s4, if the monitoring control system is abnormal in communication with the field control system and the toxic and harmful gas and dust concentration generated on the working surface of the tunnel exceeds the standard, an operator of the monitoring center can make comprehensive judgment according to the information collected by the IOServer, and then controls a fan control cabinet through a control console operating keyboard to remotely control the operation of the fan; in emergency, the operation and the stop of the fan can be directly controlled manually through the on-site fan electric control cabinet; the management server can still record the CO and VI change curves in the tunnel under manual operation so as to verify the effect and feed back the effect in time.
When the control system and the field control system are in normal communication in the step S1, the fan runs through a toxic and harmful gas concentration monitoring device arranged on the tunnel face of the excavated chamber, a standard value of harmful gas is set, monitoring data are fed back to the background intelligent analysis sensing module in real time, and the fan is automatically started when the monitoring data are larger than a specified value;
concentration of toxic and harmful gas generated on tunnel working face:
V1≤[V1](A)
in the formula: v1Concentration of toxic and harmful gases and dust, [ V ], produced at the tunnel face1]-maximum allowable concentrations of noxious and harmful gases and dust; wherein the dust concentration is less than 20g/m3The maximum allowable concentration of hydrogen sulfide is 10mg/m3Time-weighted mean allowable carbon monoxide concentration of 20mg/m3Short contact time allowable concentration of 30mg/m3. Carbon dioxide time-weighted average allowable concentration 9000mg/m3Short-time contact tolerance concentration of 18000mg/m3；
V2≥[V2](B)
In the formula: v2Oxygen concentration required by tunnel face personnel, [ V2 ]]Minimum permissible oxygen concentration is 19.5 vt%.
In the step S2, the real-time values of the environmental periods such as CO and VI and the operating state of the fan, which are detected by the area controller, are calculated according to a threshold return difference method, so as to implement full-automatic control of the operation of the fan. When the state value exceeds the upper limit threshold value, starting the executing mechanism, and when the state value is smaller than the lower limit threshold value, closing the executing mechanism;
threshold return difference value of toxic and harmful gases:
H＝Von the upper part-VLower part(C)
In the formula: the value of the H-back difference is,Von the upper partAn upper threshold value, which is the maximum allowable concentration, V, of toxic and harmful gases and dust generated on the working face of the tunnelLower partThe lower threshold value is 75% of the maximum allowable concentration of toxic and harmful gases and dust generated on the working surface of the tunnel.
In the step S2, in order to prevent the frequent switching of the fan when the mass concentration of the dust is near the set value, the value of the mass concentration back difference value of the toxic and harmful gas is particularly important. The correct value of the return difference value is beneficial to reducing the starting frequency of the fan and is beneficial to energy conservation and environmental protection. Wherein the return difference value is determined according to the actual condition of the construction site, and can be generally defaulted to 25% of the upper threshold value of the toxic and harmful gas. The running time of the fan can be calculated according to the return difference value, so that the running time is shortened, and the effect of saving electricity is achieved to a certain extent. In order to achieve the effect, the time for starting the fan each time to reach the lower limit gas concentration threshold needs to be recorded, the average running time of the fan required by the current tunnel is obtained through the actual running condition of at least more than 10 times, and then the running time of the fan is controlled according to 1.1 times of the average running time through program programming.
In the step S3, the ventilation system periodically detects the CO and VI in the tunnel and the environmental data of the wind speed and the wind direction through the IOServer, the inspection period is less than or equal to 10S, the detection result is sent into the monitoring system through the area controller, and the change rate and the average value of the detection result are calculated according to the detection data; and can be according to harmful gas concentration monitoring value, select to open the gear and automatic gear shifting, according to poisonous and harmful gas threshold value return difference value, the operating time of fan can be selected according to system's intelligent analysis to procedure or control personnel.
In the step S3, when the control system and the field control system are in normal communication, the monitoring computer network of the monitoring center performs mixed comprehensive calculation according to the CO, VI, the wind speed and the wind direction value information through software, so as to realize full-automatic control of the operation of the fan. The monitoring center operator can also make comprehensive judgment according to the information collected by the IOServer, and then control the fan control cabinet through the console operation keyboard to remotely control the operation of the fan; in emergency, the operation and the stop of the fan can be directly controlled manually through the on-site fan electric control cabinet. The detected real-time values of the environmental periods such as CO, VI and the like and the running state of the fan are dynamically displayed in a monitoring picture in real time. When a fire disaster occurs in the tunnel, the system receives the information of the fire alarm system, and the software system starts the fan according to a predetermined fan control plan.
In the step S3, when the environmental change in the tunnel reaches the alarm condition and the main device fails, the alarm information immediately pops up an alarm dialog box; the regional controller can record CO and VI change curves in the tunnel, a ventilation control statistical form under abnormal conditions every day, every week and every month, manually operate the time and control content of the control fan, and can output and print.
When the fan is automatically started, the fan closest to the tunnel face is controlled by the control cabinet to be started preferentially; when a plurality of fans are started, the delay switch is adopted to control the fans to be started at intervals, so that the impact on a power grid when the fans are started is avoided.
According to the tunnel fan intelligent control method and system, the concentration monitoring devices of toxic and harmful gases (CO, CO2, NO2, SO2 and H2S) installed on the tunnel face of an excavated chamber are used, the standard value of the harmful gases is set, monitoring data are fed back to a background intelligent analysis sensing module in real time, the fan is automatically started when the monitoring values are larger than the specified value, and a starting gear can be selected and automatic gear shifting can be carried out according to the harmful gas concentration monitoring value.
By adopting the method and the structure, the intelligent control of the tunnel fan is realized, the problems of timely and effective ventilation and exhaust of the excavation working surface of the underground space are solved, and the construction safety guarantee of machinery and personnel is provided for the excavation of the underground space. The tunnel fan intelligent control method and system are simple to operate, high in reliability and strong in safety.
Drawings
Fig. 1 is a flowchart of a tunnel blower control method of the present invention.
Fig. 2 is a network topology diagram of the tunnel fan control system of the present invention.
Detailed Description
The present invention is further described below in conjunction with the following detailed description, which is intended to further illustrate the principles of the invention and is not intended to limit the invention in any way, but is equivalent or analogous to the present invention without departing from its scope.
With reference to the attached drawings.
The invention provides a traffic tunnel ventilation control method, which comprises the following steps:
s1, the fan is intelligently operated mainly through toxic and harmful gases (CO and CO) arranged on the tunnel face of an excavated chamber2、NO2、SO2、H2S) concentration, oxygen concentration and dust concentration monitoring devices, standard values of harmful gas, oxygen and dust concentration are set, and monitoring data are fed back to the background intelligent analysis sensing module in real time. The pollutants in the tunnel are more than six kinds, other pollutants can be adopted for treatment according to the actual tunnel situation, and the pollutants are all suitable for the algorithm;
s2, judging whether the communication between the monitoring control system and the field control is normal, if so, judging whether the concentration of toxic and harmful gases and dust generated on the working surface of the tunnel exceeds the standard and the concentration of oxygen reaches the standard, and if so, entering the step S3; if not, keeping the working state of the conventional ventilation fan in the tunnel. If the communication between the monitoring control system and the field control is abnormal, especially when the main equipment breaks down, the alarm information can immediately pop up an alarm dialog box. If the environmental change in the tunnel reaches the alarm condition or needs manual operation, the process goes to step S4; if not, the working state of the conventional ventilation fan of the tunnel is kept.
And S3, if the monitoring control system is normally communicated with the field control system and the concentration of toxic and harmful gases and dust generated on the working surface of the tunnel exceeds the standard, sending the detection result into the monitoring system through the region controller, and calculating the change rate and the average value of the detection result according to the detection data. And calculating according to a threshold return difference method to realize full-automatic control of the running of the fan. And when the state value exceeds the upper limit threshold value, starting the executing mechanism, and when the state value is smaller than the lower limit threshold value, closing the execution. And selecting a starting gear and automatically shifting gears according to the real-time monitoring value of the concentration of the harmful gas.
S4, if the monitoring control system is abnormal in communication with the field control system and the toxic and harmful gas and dust concentration generated on the working surface of the tunnel exceeds the standard, an operator of the monitoring center can make comprehensive judgment according to the information collected by the IOServer, and then controls a fan control cabinet through a control console operating keyboard to remotely control the operation of the fan; in emergency, the operation and the stop of the fan can be directly controlled manually through the on-site fan electric control cabinet. The management server can still record the CO and VI change curves in the tunnel under manual operation so as to verify the effect and feed back the effect in time.
With reference to fig. 2, an intelligent control method and system for a tunnel fan includes: computer operation station, controller, emergency alarm button, gas detector, dust sensor, audible and visual alarm, fan.
Referring to FIG. 2, the gas detector mainly adopts a CO/VI detector and a wind direction and wind speed detector,
with reference to fig. 2, the data conversion interface converts the data format of the gas detector, so that the monitoring data is efficiently transmitted to the tunnel entrance through the wireless network bridge, and finally converted into a data source matched with the data communication box through the data conversion interface.
With reference to fig. 2, the computer, i.e. the central control of the monitoring system, calculates the change rate and the average value thereof according to the detection data, and finally feeds back the result to the terminal.
With reference to fig. 2, tunnel fan control system network topology receives gaseous concentration through combustible gas probe or dust sensor, carries out data processing through inside singlechip, transmits the main control system, and the main control system is with signal transmission to cloud monitored control system, triggers fan and audible and visual alarm system through setting for different grades of concentration early warning value control standard, if reach the early warning value of corresponding grade, then through the fan gear of opening of different signal intensity.
Combine fig. 2, through intelligent perception and intelligent control system, with data information transfer to computer, according to the information intensity of different grades, the computer is automatic to be controlled or staff's manual operation controller, and then control audible and visual alarm system and fan, guarantee that gaseous and dust concentration control is in reasonable scope in tunnel and the underground cavern work progress, avoid inhaling to cause harm to human health, influence machinery normal work, provide personnel, machinery and construction safety for underground space excavation.
Claims (8)
1. The utility model provides a tunnel fan intelligent control system which characterized in that: the system consists of a CO/VI detector, a wind direction and wind speed detector, a fan control cabinet, a fan and a zone controller which are arranged in a tunnel;
the CO/VI detector is used for monitoring and acquiring basic data of carbon monoxide and visibility in the tunnel, is arranged on a side wall of the tunnel, and is in signal connection with the data of the zone controller;
the wind direction and wind speed detector is used for monitoring and acquiring basic data such as wind speed and wind direction in the tunnel, an area and a position with data representativeness are selected for equipment installation, and the equipment is generally installed on the side wall of the tunnel and the face of an excavated chamber and is connected with a data signal of a region controller;
the fan control cabinet is used for controlling the running state of the fan and is arranged at the same position with the fan to control the fan;
the fans are uniformly arranged in the tunnel at intervals, the distance between every two adjacent fans is 350m, and the fans are controlled to be opened and closed by the fan control cabinet;
the area controller is installed on the site of a tunnel protection area, is directly connected with the CO/VI detector, the wind direction detector and the wind speed detector, is used for processing various alarm information, and is also connected with an emergency alarm system.
2. The tunnel fan intelligent control method is characterized by comprising the following steps: the tunnel fan intelligent control system of claim 1 is adopted, and the control method comprises the following steps:
s1, acquiring the concentration of toxic and harmful gases, the concentration of oxygen and the concentration of dust by a CO/VI detector, a wind direction and wind speed detector and the like, and feeding monitoring data back to a regional controller in real time; setting standard values of concentrations of harmful gases, oxygen and dust; the harmful gas comprises CO and CO2、NO2、SO2、H2S；
S2, the program or the staff judges whether the communication between the monitoring control system and the field control system is normal or not according to the monitoring control system, if the communication is normal, the program or the staff continuously judges whether the concentrations of toxic and harmful gases and dust generated on the working surface of the tunnel exceed the standards or not and whether the concentration of oxygen reaches the standards or not, if so, the program or the staff enters a step S3; if not, keeping the working state of the conventional ventilation fan in the tunnel; if the communication between the monitoring control system and the field control is abnormal, especially when the main equipment breaks down, the alarm information can immediately pop up an alarm dialog box. If the environmental change in the tunnel reaches the alarm condition or needs manual operation, the process goes to step S4; if not, keeping the working state of the conventional ventilation fan of the tunnel;
s3, if the monitoring control system is normally communicated with the field control system and the concentration of toxic and harmful gases and dust generated on the working surface of the tunnel exceeds the standard, sending the detection result into the monitoring system through a region controller, and calculating the change rate and the average value of the detection result according to the detection data; calculating according to a threshold return difference method to realize full-automatic control of the operation of the fan; when the state value exceeds the upper limit threshold value, starting the executing mechanism, and when the state value is smaller than the lower limit threshold value, closing the execution; selecting a starting gear and automatically shifting gears according to a real-time monitoring value of the concentration of the harmful gas;
s4, if the monitoring control system is abnormal in communication with the field control system and the toxic and harmful gas and dust concentration generated on the working surface of the tunnel exceeds the standard, an operator of the monitoring center can make comprehensive judgment according to the information collected by the IOServer, and then controls a fan control cabinet through a control console operating keyboard to remotely control the operation of the fan; in emergency, the operation and the stop of the fan can be directly controlled manually through the on-site fan electric control cabinet; the management server can still record the CO and VI change curves in the tunnel under manual operation so as to verify the effect and feed back the effect in time.
3. The intelligent control method of the tunnel fan according to claim 2: the method is characterized in that: when the control system and the field control system are in normal communication in the step S1, the fan runs through a toxic and harmful gas concentration monitoring device arranged on the tunnel face of the excavated chamber, a standard value of harmful gas is set, monitoring data are fed back to the background intelligent analysis sensing module in real time, and the fan is automatically started when the monitoring data are larger than a specified value;
concentration of toxic and harmful gas generated on tunnel working face:
V1≤[V1](A)
in the formula: v1Concentration of toxic and harmful gases and dust, [ V ], produced at the tunnel face1]-maximum allowable concentrations of noxious and harmful gases and dust; wherein the dust concentration is less than 20g/m3The maximum allowable concentration of hydrogen sulfide is 10mg/m3Time-weighted mean allowable carbon monoxide concentration of 20mg/m3Short contact time allowable concentration of 30mg/m3. Carbon dioxide time-weighted average allowable concentration 9000mg/m3Short-time contact tolerance concentration of 18000mg/m3；
V2≥[V2](B)
In the formula: v2-tunnel face personnel required oxygen concentration, [ V [ ]2]Minimum permissible oxygen concentration is 19.5 vt%.
4. The intelligent control method of the tunnel fan according to claim 2: the method is characterized in that: in step S2, the real-time values of the environmental periods such as CO and VI and the operational state of the fan, which are detected by the area controller, are calculated according to a threshold regression method, so as to implement full-automatic control of the operation of the fan. When the state value exceeds the upper limit threshold value, starting the executing mechanism, and when the state value is smaller than the lower limit threshold value, closing the executing mechanism;
threshold return difference value of toxic and harmful gases:
H＝Von the upper part-VLower part(C)
In the formula: h-difference of return, VOn the upper partAn upper threshold value, which is the maximum allowable concentration, V, of toxic and harmful gases and dust generated on the working face of the tunnelLower partThe lower threshold value is 75% of the maximum allowable concentration of toxic and harmful gases and dust generated on the working surface of the tunnel.
5. The intelligent control method of the tunnel fan according to claim 2: the method is characterized in that: in the step S3, the ventilation system periodically detects the CO and VI in the tunnel and the environmental data of the wind speed and the wind direction through the IOServer, the patrol period is less than or equal to 10S, the detection result is sent into the monitoring system through the area controller, and the change rate and the average value of the detection result are calculated according to the detection data; and can be according to harmful gas concentration monitoring value, select to open the gear and automatic gear shifting, according to poisonous and harmful gas threshold value return difference value, the operating time of fan can be selected according to system's intelligent analysis to procedure or control personnel.
6. The intelligent control method and system of the tunnel fan as claimed in claim 2, wherein in step S3, when the control system and the site control system are communicating normally, the monitoring computer network of the monitoring center performs the hybrid comprehensive calculation of software according to the CO, VI, the wind speed and wind direction information, so as to realize the full-automatic control of the fan operation. The monitoring center operator can also make comprehensive judgment according to the information collected by the IOServer, and then control the fan control cabinet through the console operation keyboard to remotely control the operation of the fan; in emergency, the operation and the stop of the fan can be directly controlled manually through the on-site fan electric control cabinet. The detected real-time values of the environmental periods such as CO, VI and the like and the running state of the fan are dynamically displayed in a monitoring picture in real time. When a fire disaster occurs in the tunnel, the system receives the information of the fire alarm system, and the software system starts the fan according to a predetermined fan control plan.
7. The intelligent control method of the tunnel fan according to claim 2: the method is characterized in that: in step S3, when the environmental change in the tunnel reaches the alarm condition and the main equipment fails, the alarm information immediately pops up an alarm dialog box; the regional controller can record CO and VI change curves in the tunnel, a ventilation control statistical form under abnormal conditions every day, every week and every month, manually operate the time and control content of the control fan, and can output and print.
8. The intelligent control method of the tunnel fan according to claim 4: the method is characterized in that: when the fan is automatically started, the fan closest to the tunnel face is controlled by the control cabinet to be started preferentially; when a plurality of fans are started, the delay switch is adopted to control the fans to be started at intervals, so that the impact on a power grid when the fans are started is avoided.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113565551B (en) * | 2021-06-11 | 2023-09-22 | 华能煤炭技术研究有限公司 | Automatic gain control mine ventilation method, device and system |
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