396 results about "Tunnel ventilation" patented technology

A ventilation device that enhances the longitudinal thrust of a fan (2) installed within a tunnel, by the introduction of a convergent nozzle (7) to accelerate the outlet flow (8). An angled transition piece (6) can turn the flow by a specific angle (36). Multiple fans can be connected to common inlet and outlet plenums, supplying one or more convergent nozzles. Bi-directional flow can be achieved by fitting convergent nozzles to both sides of a fan, with bypass dampers optionally installed between the fan and the two nozzles. The nozzle trailing edge can be shaped with multiple lobes, chevrons or tongues, and the fan centre-body can be shaped with multiple lobes. A fire suppression agent such as water mist can be supplied into the ductwork between the fan and the nozzle trailing edge. Acoustic silencing can be achieved using the absorbent material on the nozzle and fan centre-body.

A chicken or fowl grow out facility utilizes a ventilated floor assembly including a ventilated floor through which liquid and gas can flow, but which retains manure and other solids deposited thereon, and a bottom floor plenum underneath the ventilated floor. A liquid and vapor barrier sheet preferably covers the ground surface underneath the floor assembly which together insulate the high temperature of the grow-out facility from the heat sink effect of the lower temperature ground. Conventional tunnel ventilation of the chicken house through the ends of the house creates a negative pressure inside the house relative to the outside environment which is vented to the floor assembly plenum. As a result of this tunnel ventilation and negative pressure, moisture in the manure from urine and otherwise evaporates into the air in the growth chamber and floor assembly plenum to effectively keep dry the manure retained on the floor and reduce ammonia formation and pathogen growth.

The invention relates to a tunnel smoke-discharge method, which comprises: (1), insulating one independent smoke-discharge channel in the tunnel, which comprises a smoke-discharge valve, a smoke-discharge transmission channel through to the smoke-discharge channel and a smoke-discharge fan inside the smoke-discharge transmission channel; (2) in normal condition, the smoke-discharge channel, smoke-discharge valve, the smoke-discharge transmission channel and the smoke-discharge fan do not work; (3), when discharging smoke, starting the smoke-discharge valve near the smoke source, to discharge the smoke into the smoke-discharge channel, and via the smoke-discharge transmission channel to be discharge outside the tunnel. The invention also discloses a relative tunnel ventilation system, with independent smoke-discharge system. The invention can be used in variable tunnels.

The invention discloses a fuzzy-control-based method for controlling ventilation of tunnels, which is characterized in that a first fuzzy controller and a second fuzzy controller respectively output a first blower quantity value and a second blower quantity value, the number of blowers which need to be turned on is obtained by choosing the bigger one of the first blower quantity value and the second blower quantity value; the input quantity of the first fuzzy controller is the current concentration of carbon monoxide and the current concentration increment thereof; the input quantity of the second fuzzy controller is the current smoke concentration and the current smoke concentration increment. The method of the invention does not depend on mathematical modeling of the controlled object and can realize intelligent control of tunnel ventilation based on the fuzzy control.

The invention discloses a ventilation, smoke discharge and evacuation system for an underwater single-tube double-layer shield traffic tunnel. The ventilation, smoke discharge and evacuation system comprises an upper-layer lane, a lower-layer lane, a jet fan and a wind tower. An axial flow fan is arranged in the wind tower. A sector space on one side face of a round shield section of the tunnel is an independent smoke discharge channel. An escape channel is arranged in a sector space on the other side of the round shield section of the tunnel. A staircase connected with the upper layer and the lower layer is arranged in the escape channel. An upper-layer front room is arranged between the staircase and a lower-layer escape door. A lower-layer front room is arranged between the staircase and an upper-layer escape door. Positive pressure fans are installed on the wall shared by the upper-layer front room and the staircase and the wall shared by the lower-layer front room and the staircase respectively. The upper end of the side wall of the tunnel is provided with an upper-layer smoke outlet and a lower-layer smoke outlet. The upper-layer smoke outlet and the lower-layer smoke outlet are respectively provided with an automatic smoke discharge fire damper. By means of the ventilation, smoke discharge and evacuation system, fire smoke can not diffuse between the upper layer and the lower layer, the visibility of the escape environment is good, the escape environment is not invaded by the smoke, personnel evacuation is efficient and quick, escape time is greatly shortened, personnel casualties are reduced, construction is safe, and later-period maintenance is easy.

The invention provides a highway tunnel ventilation feedforward control method based on environmental forecasting. The method comprises steps as follows: sensors in a tunnel collect CO / VI concentration and instant information of traffic flow in the tunnel and transmit the CO / VI concentration and the instant information to a monitoring center computer; the traffic flow of the n time period is substituted into a tunnel traffic flow data predication model, and the traffic flow of the (n+1) time period is predicated; theoretical values of the CO / VI concentration in the n time period and the (n+1) time period are obtained through calculation; a predicated increment of the CO / VI concentration is calculated according to an actually measured CO / VI concentration value as well as the theoretical values of the CO / VI concentration in the n time period and the (n+1) time period; the predicated increment of the CO / VI concentration is input into a fuzzy controller, and the number of changed fans is obtained through processing and calculation of the fuzzy controller and is taken as a controlled variable to be output to a site area controller; the site area controller controls the fans to be started or stopped according to the controlled variable. With the adoption of the method, optimal operation of the tunnel ventilation control system is realized, and traffic safety is guaranteed.

The invention discloses a tunnel event detection method based on integrated learning time sequence prediction, which mainly solves the problem that similar methods fail to accurately predict values of a sensor and cannot effectively control tunnel ventilation. The method comprises the detection steps of: pre-processing acquired highway tunnel data to form a training data set; training a plurality of basic predictors according to the training data set, and forming a strong predictor by the weighted combination of the basic predictors; utilizing the strong predictor to calculate a predictive value of smoke concentration of a tunnel at t+1 time according to a value of a tunnel sensor at the current t time, and dynamically adjusting the basic predictors which take part in the integration according to prediction error; comparing the predictive value of the smoke concentration of the tunnel at t+1 time with a smoke concentration threshold, and judging whether the smoke concentration is an over-standard event; and for the over-standard event, calculating control parameters of a ventilation controller, and reducing the smoke concentration. The method has the advantages of strong prediction function and high control accuracy of the ventilation controller, and is used for operation monitoring, energy conservation and emission reduction of highway tunnels.

The invention relates to a novel tunnel ventilation system for a subway station, which is applied to ventilation of an inter-region tunnel and a station tunnel. The novel tunnel ventilation system is characterized by comprising first and second exhaust shafts, first and second piston air shafts, a first exhaust passage, a first communication air duct, a first piston air duct, a second exhaust passage, a second communication air duct, a second air duct, first and second upper air ducts, and first and second lower air ducts, wherein a first tunnel blower is arranged on the first exhaust passage or the first piston air duct, a second tunnel blower is arranged on the second exhaust passage or the second piston air duct, and electric blast gates are arranged on the individual air ducts. The ventilation system incorporates the inter-region tunnel ventilation system and the station tunnel ventilation system and reduces the number of station piston air shafts, so as to not only reduce the civil engineering cost but also reduce the floor area occupied.

The invention relates to a centralized waste gas discharging method used in longitudinally ventilated road tunnel, which belongs to the road tunnel ventilation and fire-fighting field. The road tunnel comprises an upward tunnel an a downward tunnel; The method comprises: disposing a pass-by duct on each tunnel near the tunnel portal to cause the airflow in one tunnel along the freight flow direction to flow into another tunnel through the pass-by duct; and arranging at least one centralized air-discharging well respectively inside the upward tunnel and the downward tunnel. The invention has the following advantages: solves the problem of addressing centralized air-discharge well in road tunnel, especially city tunnel; expands addressing range, develops tunnel ventilating and exhausting manners, and improves the tunnel construction feasibility of the section difficult for building wind well.

The invention discloses a ventilation system and a ventilation method for single-cavern large-section extra-long tunnel construction. The ventilation system comprises a construction ventilation temporary partition (2) arranged on one side of a center line of a tunnel; a ratio of a sectional area of a sealed roadway formed by the construction ventilation temporary partition (2) and one side wall of the tunnel to a sectional area of a sealed roadway formed by the construction ventilation temporary partition (2) and the other side wall of the tunnel is close to 2:1; the sealed tunnel with the smaller sectional area is taken as a fresh air intake airway (4); polluted air returned from a tunnel face is discharged out of the tunnel through a polluted air discharging roadway (5) with the larger sectional area; at the outlet of a tunnel portal, the construction ventilation temporary partition (2) extends out of the portal to separate fresh air from polluted air in an area close to the portal. A jet flow tunnel ventilation mode is adopted, the difficult problem of extra-long-distance air supply during the single-cavern large-section extra-long tunnel construction is solved, the air supply efficiency for the tunnel face is effectively improved, the cost is saved, and a better economic benefit is achieved.

A high speed powerboat hull (100) incorporating a tunnel ventilation channel (154) spanning between a starboard (160) and port (162) side of the hull (100). The hull (100) has a “V” shaped forward section. The ventilated tunnel (150) is provided as a recess having two substantially vertical sidewalls (152) arranged parallel to each other located along each of the two outer edges of the tunnel (150). The tunnel (150) is disposed longitudinally between the ventilated channel (154) and a transom (112). The ventilated tunnel (150) is in fluid communication with the ventilation channel (154). The hull (100) can further comprise at least one stepped hull section (122, 126).

The invention relates to the technical field of tunnel ventilation and discloses a tunnel ventilation system. The tunnel ventilation system comprises a tunnel ventilation device, and the tunnel ventilation device comprises an air inlet device and an air outlet device, wherein the air outlet device comprises a shell, a filtering plate above the shell and a fan above the filtering plate; the air outlet device comprises a bottom plate, a top plate connected with the bottom plate and an arc plate connected with the top plate; the bottom plate, the top plate and the arc plate define a cavity for ventilation; and the shell is communicated with the cavity. Compared with the traditional mechanical ventilation mode, the tunnel ventilation system obviously improves the ventilation effect, increases the safety factor, reduces noise pollution, saves energy and is environmentally-friendly.

The invention relates to the technical field of road tunnel ventilation, in particular to an environment prediction-based tunnel ventilation control method and system. The tunnel ventilation control method comprises the steps of setting target values of indexes related to a tunnel environment; collecting detection values of the indexes at a current moment; according to the detection values of theindexes and a prediction model built through deep learning, predicting prediction values of the indexes at a next moment; and according to the detection values, the prediction values and the target values of the indexes, adjusting ventilation volume of a tunnel. The tunnel ventilation control system comprises a fan set, a detection apparatus and a control apparatus, wherein the fan set is arrangedin the tunnel; the detection apparatus is arranged corresponding to the fan set; and the control apparatus is connected with the fan set and the detection apparatus. According to the environment prediction-based tunnel ventilation control method and system, the hysteresis of air volume feedback control can be reduced and the ventilation volume control accuracy can be improved.

The invention relates to the field of small-section tunnel single-head long-distance ventilation, in particular to a small-section tunnel single-head long-distance ventilation construction method. The small-section tunnel single-head long-distance ventilation construction method includes the steps of A, analyzing a pollution source, and determining the ventilation standard; B, designing a ventilation system; C, calculating tunnel ventilation parameters, selecting a draught fan, and implementing the scheme. The ventilation system is specifically characterized in that during main tunnel construction, the draught fan is arranged at an outer opening of an inclined shaft, the pressed ventilation mode is adopted, an air pipe extends into a main tunnel and is branched in the advancing directions of the two working faces of the main tunnel, jet fans are arranged on the two sides of an inner opening of the inclined shaft, and the jet directions of the jet fans face the inner opening of the inclined shaft. The small-section tunnel single-head long-distance ventilation construction method is good in ventilation effect and low in cost, and brings convenience to device maintenance and device replacement.

This invention discloses mine single- tunnel driving ventilator integrating control system. PLC connects to frequency converter and display screen by series communicating interface. PLC connects to communicating expand module and analog value expand module by I / O bus. Main protecting circuit board and engine protecting circuit board connect to analog value expand module by I / O interface. PLC connects to main protecting circuit board and engine circuit board by I / O interface. This invention uses PLC as central processor and has hardware circuit and the control method. It achieves the stable switch of various controlling methods and protection function such as electric leakage, symmetric short, overload and steady state over-voltage. This invention ensures the continuity of tunneling ventilation and safety of gas discharging. It is adapted for tunneling ventilation of mine single tunnel driving working face and gas discharging.

The invention discloses a tunnel ventilation interflow system and a method for allocating and adjusting wind power, which is mainly to solve rationally allocation of ventilation of an excavating face tunnel. The system consists of two or three ventilation devices and a plurality of connected wind-cones and a plurality of valves, each ventilation device is formed by a wind-cone and a set of blowers, adjacent ventilation devices are connected by the connected wind-cones, and the plurality of valves are arranged in each wind-cone and each connected wind-cone. The tunnel ventilation interflow system and the method have the advantages that: the prior ventilation pipeline is networked, conveying direction and wind power intensity are allocated and adjusted by opening or closing a valve so as to form wind supply ways of one to one, one to many, many to one and many to many of a ventilator and an excavating face, which can realize effectively dispatching and allocation of the wind power.

A tunnel ventilation system located in an upper section of a tunnel has a ventilation section divided into two or three ventilation ducts. One or more of the ducts are connected to reversible fan units so the ducts can serve as either an air infeed or an air exhaust system. The ducts contain a series of remotely controlled flaps which can be opened to ventilate different tunnel zones or closed to isolate other parts of the tunnel. Air blowers at tunnel entrances create an air screen that prevents unintended air circulation into the tunnel. Heat, smoke and other sensors and a software control system enable the system to detect smoke and fire, then to isolate and control ventilation in the fire zone. A fire suppression system using low oxygen air or other fire suppression fluids to blanket and smother the fire operates in conjunction with the ventilation system.

The invention discloses a road tunnel ventilation testing device comprising a tracer gas inlet device, an organic glass tunnel, an axial flow fan, a wind velocity indicator, a CO detecting instrument and a baffle plate, and is characterized in that the organic glass tunnel comprises two adjacent tunnels and is made of organic glass in segments, the axial flow fan is a ventilating device, the flow fan is connected with the organic glass tunnels, the wind velocity indicator is a wind velocity measuring instrument, the wind velocity indicator is positioned at the air outlet mouth of the organic glass tunnel, the CO detecting instrument is a tracer gas measuring instrument, the CO detecting instrument is positioned at the air outlet mouth of the organic glass tunnel, the baffle plate is positioned between the air inlet end and the air outlet end of the organic glass tunnel, and the tracer gas inlet device is connected with the first organic glass tunnel. The testing device in the invention has the advantages of low cost, good ventilation, simple structure, convenient and easy test, stable and reliable testing result, and the like.

The invention provides a simulation test method of a ventilation on-way frictional resistance coefficient of a curved tunnel and belongs to the technical field of a tunnel ventilation disaster-preventing technology. The simulation test method comprises the following steps of: selecting an appropriate similarity ratio and manufacturing a curved model tunnel and a straight-line model tunnel for rectification section by section; selecting sand paper as an inner surface of the curved model tunnel; connecting the curved model tunnel with the straight-line model tunnel and a rectifying circular tube; connecting the rectifying circular tube with a test fan; mounting static-pressure test tubes on the curved model tunnel at two end points with the length to be detected; inserting a pitot tube into a small test hole of the rectifying circular tube; externally connecting a micro-manometer; providing a test air quantity by the fan; and substituting a measured static pressure difference value and a dynamic pressure value into a formula to calculate the frictional resistance coefficient in the curved model tunnel. By comparing a result obtained by a simulation test with an actual numerical calculation result, the requirement on acceptable precision in engineering is met.

The invention discloses a multi-parameter tunnel ventilation control method based on the discharge rate and the concentration. A plurality of jet fans are sequentially arranged in a tunnel in a scattering manner from front to back, a plurality of ventilation shafts are arranged section by section, and an exhaust fan is arranged on each ventilation shaft; the control method of the jet fans comprises the following steps: a controller is adopted to control the starting or the stopping of the jet fans according to the concentration detection value, the corresponding set value and the corresponding control domain; the control method of the ventilation shafts comprises the following steps: the controller controls the starting or stopping of the exhaust fans according to the concentration detection value, the wind speed detection value, the calculated value QNox of the nitrogen oxide discharge rate, the respective set values and the respective control domains theta. The starting or stopping sequence of the jet fans and the concentrated exhaust fans is controlled according to the smokescope (CVI) and the CO concentration (CCO), the quantitative control is achieved, and energy waste, which is caused by the fact that the concentrated exhaust fans and blowers are started for a long time, can be avoided.

The invention specifically relates to a ventilation method of inclined shaft assisted double-hole construction. The ventilation method comprises the following steps: A, analyzing a pollution source and determining a ventilation standard; B, designing a ventilation system; and C, calculating tunnel ventilation parameters, selecting a fan and implementing a scheme; the ventilation system in the step B is specifically as follows: an axial-flow fan is arranged at an outer hole of an inclined shaft at an inclined shaft construction phase and a phase when inclined shaft construction is completed and a tunnel portal does not communicate with the inclined shaft, and a heading-face forced ventilation pattern is adopted with an air duct extending into a working face for ventilation; at a phase when the tunnel portal communicates with the inclined shaft, the tunnel portal is communicated with the inclined shaft and a jet flow gallery ventilation pattern is adopted, and a secure tunnel and a main tunnel both serve as air intake channels, while the inclined shaft serves as an exhaust channel. The ventilation method in the inclined shaft assisted double-track construction solves a long-distance problem that single forced ventilation fails in solving, and is high in ventilation efficiency and good in effect; moreover, the ventilation time is shortened and the construction efficiency is improved, and both electricity and air ducts can be saved; in addition, maintenance is convenient.

The invention discloses a blade-type mechanical regulating device for an air outlet of an air duct on a coal mine comprehensive tunneling working face. The blade-type mechanical regulating device comprises the blade-type air duct, a dial hanging top frame, an I-shaped sliding rail and a one-way sliding trolley. The one-way sliding trolley is arranged on the I-shaped sliding rail. The top of the dial hanging top frame is fixedly connected with the bottom of the one-way sliding trolley. The blade-type air duct penetrates through the dial hanging top frame and comprises an air outlet adjusting duct, a blade connecting ring, an air duct main body, a framework air duct and a flexible air duct which are arranged sequentially. The air outlet adjusting duct comprises a plurality of diameter adjusting outer blades, a distance is reserved between every two adjacent diameter adjusting outer blades, and a diameter adjusting inner blade is arranged on the inner side of the space between every two adjacent diameter adjusting outer blades. A horizontal steering mechanism is arranged between the air duct main body and the dial hanging top frame. Gas and dust accumulation during tunneling ventilation can be reduced, the ventilation efficiency is improved, and the healthy and comfortable ventilation environment is created in a movement area for downhole personnel.

The invention provides a liftable slope-variable tunnel fire simulation device and a method thereof. The device is mainly composed of four parts, namely, a tunnel main body, a longitudinal ventilationsystem, a combustion source and a supporting measurement and control system; the tunnel main body includes a tunnel frame, a supporting rack, fireproof cloth, tempered glass and a magnesium oxide board wall; the tunnel ventilation system includes a frequency-adjustable axial flow fan and a rectification net; the tunnel combustion source includes a combustion dish and a tripod; and the tunnel supporting measurement and control system includes an electronic balance, an anemometer, a laser transmitter, a thermocouple and a camera. The simulation device has the advantages of little experiment consumption, high repeatability, and capability of comprehensively detecting the changes of temperature and wind speed under different slopes and lifting conditions.

The invention provides a method which disposes gases at corners and goaf by a one-intake one-return staggered tail tunnel ventilation type, which solves the problem that a plurality of gases are accumulated at the air return corners. The invention is characterized in that a working face air inlet tunnel and an air return tunnel are arranged along the soleplate of no. 15 coal; the staggered tail tunnel is arranged along the top plate of the no. 15 coal, which has the horizontal distance of 10-15m with the air return tunnel generally; a wind absorbing port extends at least more than 5m into a coal wall along the goaf direction, namely, the wind absorbing port is lagged by more than 5m compared with the stope air return port of the fully mechanised working face; the wind absorbing port is vertically higher than the soleplate of the stope space of the working face by nearly 5m, which is arranged at the upper wind side of the mechanised working face wind return corner and also at the top layer of the no. 15 coal layer; the wind inlet gateway and the wind return gateway are arranged along the soleplate of the coal layer and are supported by an iron shed, with the profile of 9m2; the staggered tail tunnel has 10m away from the wind return gateway horizontally, is arranged along the top plate of the no. 15 coal layer, and supported by anchors with the tunnel profile of 8m<2>; the invention has the advantages of convenient construction, safety and reliability, convenient management, low cost and obvious effect. The invention is especially suitable for gas disposal of coal mine.

The invention discloses a subway long and large interval fire experiment system and method. The subway long and large interval fire experiment system includes a subway tunnel entity unit, a train unit, a hot smoke generation unit, a ventilation smoke evacuation unit and an experiment measurement data acquisition unit, wherein the train unit is arranged in the subway tunnel entity unit; the hot smoke generation unit is used for generating the fire source and the smoke which are required by a fire experiment; the fire source and the smoke are generated in the train unit; the ventilation smoke evacuation unit is arranged on the subway tunnel entity unit, and is used for discharging the smoke in the subway tunnel entity unit; and the experiment measurement data acquisition unit is used for acquiring the fire experiment data. The subway long and large interval fire experiment system can simulate a fire accident in a subway long and large interval, thus saving the cost for fire accident simulation, and can optimize tunnel ventilation and smoke evacuation design of the subway long and large interval.

The invention discloses an inclined well-assisted tunnel partition ventilation system. The tunnel includes a main tunnel and an inclined shaft, the inclined shaft communicates with the main tunnel, and an axial partition is arranged inside the inclined shaft and the main tunnel. The partition board divides the main tunnel into an upper normal tunnel and a lower normal tunnel, and the axial flow fan sends the air flow to the vicinity of the tunnel surface through the air duct. The upper inclined shaft communicates with the upper normal tunnel, and the lower inclined shaft communicates with the lower The main hole is connected, and the other ends of the upper inclined shaft and the lower inclined shaft are connected with the outside world. A jet fan is arranged in the upper inclined shaft, and an axial flow fan is arranged in the upper main hole. The invention divides the inner space of the tunnel into upper and lower parts through partitions. The ventilation system of the upper main tunnel for air supply and the lower main tunnel for exhaust air saves tunnel space, has large air supply volume, convenient and flexible layout, and is more suitable for growing complex Ventilation of the tunnel.

The invention discloses a ventilation control system for a tunnel face. The ventilation control system comprises a control device, a tunnel ventilation device, an air quality status monitoring device, an oxygen generating plant and a liquid dust-removal spray device, wherein the control device is arranged on the tunnel face of a construction tunnel, the tunnel ventilation device is arranged in the construction tunnel, the air quality status monitoring device is used for monitoring the air quality status of the tunnel face of the construction tunnel in real time, and the oxygen generating plant and the liquid dust-removal spray device are distributed on the tunnel face of the construction tunnel. The tunnel ventilation device comprises multiple sets of air supply devices and an exhaust fan arranged on the tunnel face. The control device comprises a control keyboard, a monitor, a keyboard circuit, a data storage unit and a second wireless communication module, wherein the keyboard circuit is connected with the control keyboard, and the data storage unit and the second wireless communication module are connected with the monitor respectively. The oxygen generating plant, the liquid dust-removal spray device and the exhaust fan are all controlled by the monitor and are connected with the monitor respectively. The ventilation control system is reasonable in design, convenient to install and lay, easy and convenient to use and operate, good in use effect, and capable of optimally regulating and controlling environmental conditions of the tunnel face.

The invention discloses a road tunnel ventilation performance model testing system. The road tunnel ventilation performance model testing system comprises a tunnel model, a traffic wind simulation system, a jet flow wind simulation system and a data test system. The traffic wind simulation system comprises a simulation dynamic model car and a car operation control system. The car operation control system comprises an annular guide rail model and a voltage controlled power source. The annular guide rail model is provided with two opposite straight line road sections and two opposite arc road sections, and road faces of the two arc road sections are inclined faces with lower inner sides and high outer sides. The voltage controlled power source comprises two groups, one group supplies power to the straight line road sections, in a tunnel, of the annular guide rail model, and the other group supplies power to the straight line road sections, paved outside the tunnel, of the annular guide rail model. The simulation dynamic model car operates on the annular guide rail model and gets power from the guide rail when passing through the two opposite straight line road sections. The road tunnel ventilation performance model testing system can form traffic wind which is stable and capable of guaranteeing that air flow can enter a self-model area, and has the advantages of being multifunctional and strong in development generality.

A tunnel ventilation system located in an upper section of a tunnel has a ventilation section divided into two or three ventilation ducts. One or more of the ducts are connected to reversible fan units so the ducts can serve as either an air infeed or an air exhaust system. The ducts contain a series of remotely controlled flaps which can be opened to ventilate different tunnel zones or closed to isolate other parts of the tunnel. Air blowers at tunnel entrances create an air screen that prevents unintended air circulation into the tunnel. Heat, smoke and other sensors and a software control system enable the system to detect smoke and fire, then to isolate and control ventilation in the fire zone. A fire suppression system using low oxygen air or other fire suppression fluids to blanket and smother the fire operates in conjunction with the ventilation system.