290 results about "Tunnel ventilation" patented technology

The invention belongs to the technical field of highway tunnel ventilation control, and provides a highway tunnel ventilation control method and system. The method comprises the following steps of multi-source heterogeneous data acquisition, multi-source data fusion, state estimation, traffic flow prediction, dynamic pollution index calculation and multi-target weight generation, rolling optimization with constraints, control execution, model updating and feedback correction. The state sensing precision is improved through multi-source data fusion, real-time accurate estimation and error reduction of a pollutant concentration field and a traffic flow state are realized through a heterogeneous sensor and a Rayleigh fusion technology, the problem of sensing deviation caused by single data in a traditional method is solved, future traffic flow is predicted based on a graph neural network, and the traffic flow sensing accuracy is improved. The fan power is optimized through model prediction control, the ventilation intensity is adjusted in advance, pollutants are prevented from exceeding the standard, the response speed is increased compared with threshold value control, and energy consumption is reduced.

The invention discloses a tunnel ventilation control system and method based on artificial intelligence, and relates to the technical field of ventilation control, and the method comprises the steps: in a tunnel design stage, building an unsteady-state computational fluid dynamics model based on tunnel three-dimensional linear parameters, calculating turbulence structures under different traffic conditions through a large eddy simulation method, and calculating an unsteady-state computational fluid dynamics model; determining an optimal space configuration scheme of the fan group according to the distribution of the velocity field and the pressure field; in the tunnel construction stage, multiple types of sensor arrays are arranged along the vault and the side wall of a tunnel in a layered mode; in the tunnel operation stage, real-time vehicle tracks and speed distribution information of a traffic monitoring system are obtained; establishing a ventilation demand dynamic prediction model based on space-time correlation analysis, constructing a fan cooperative control model considering airflow organization optimization, and solving an optimal operation strategy by adopting a multi-target adaptive weight distribution algorithm; when a fire characteristic signal is monitored, the multiple sets of fans are coordinated to form a relay type smoke exhaust airflow organization.

The invention relates to the technical field of tunnel ventilation control, in particular to a tunnel traffic volume and air demand prediction method based on a BP neural network. The method comprises the following steps: arranging a multi-layer sensor array of a tunnel vertical section according to tunnel structure parameters and traffic flow data; the method comprises the following steps: acquiring environmental parameters of a tunnel along a vertical direction by using a multi-layer sensor array, and integrating traffic flow data to obtain environment-traffic coupling data; performing environment-traffic working condition feature extraction and association according to the environment-traffic coupling data to obtain a vertical feature layer division map and a working condition-pollution response association matrix; and according to the vertical feature layer division map and the working condition-pollution response incidence matrix, carrying out pollutant migration dynamics calculation under the heat and humidity conditions to obtain a pollutant migration dynamics parameter set. According to the method, the tunnel vertical stratification pollutant load index is constructed, the air demand amount is predicted and optimally distributed, and the intelligent level and the operation efficiency of a tunnel ventilation system are remarkably improved.

The invention relates to the technical field of tunnel ventilation and environmental protection, in particular to an efficient and energy-saving tunnel ventilation and dust removal integrated system. Data analysis and decision making; ventilation control; dust removal operation; and sewage treatment. The intelligent sensing module is installed in the tunnel, environment parameters of different positions can be accurately obtained in real time and transmitted to the central control system, the efficient and energy-saving draught fan is selected, the frequency conversion and speed regulation device is installed, energy consumption is reduced, and by arranging the air filtering device and the dust falling device, the dust falling efficiency is improved. The dust collection device and the dust blocking device arranged at the tunnel portal effectively control the air environment quality in the tunnel, sewage purification and cyclic utilization are achieved through sewage treatment, and the system is high in intelligent degree, can be flexibly adjusted according to the actual situation and is suitable for popularization and application. The problems that a traditional ventilation and dust removal mode is high in energy consumption, poor in effect, lack of intelligent control and the like are effectively solved, the health of constructors is guaranteed, and pollution to the surrounding environment is reduced.

The invention relates to a tunnel ventilation system parameter optimization method based on neural network model driving, and the method comprises the steps: dividing a tunnel into a plurality of irregular grid nodes according to the three-dimensional geometrical characteristics, aerodynamic characteristics and pollutant distribution characteristics of the tunnel; constructing a nonlinear edge weight calculation function according to the spatial distribution data of the plurality of irregular grid nodes in combination with a pollutant diffusion coefficient, a real-time wind speed field and a spatial position relationship among the grid nodes, and generating an edge weight matrix representing interaction strength among the grid nodes; inputting the grid node information of the plurality of irregular grid nodes and the edge weight matrix into a space-time diagram neural network model to obtain multivariable space-time dynamic characteristics of the pollutants; according to the multivariable space-time dynamic characteristics, pollutant concentration overrun probabilities of the irregular grid nodes are determined; and according to the pollutant concentration overrun probability of the irregular grid nodes, ventilation regulation and control parameters of the tunnel ventilation system are optimized. The design of ventilation system parameters can be optimized.

The invention discloses an ultra-long tunnel small and large fan air compression and supply coordinated ventilation method, and relates to the technical field of tunnel ventilation, and the method comprises the following steps: collecting tunnel environment parameters in real time, and generating a time-space associated environment parameter data set; a main and auxiliary fan performance attenuation model is combined to establish an air quantity coordination intelligent model, and air quantity dynamic distribution according to needs is achieved; frequency conversion air pressure adjustment, partition air volume supplement and air valve intelligent opening degree adjustment operation are executed; and a multi-parameter fusion deviation evaluation model is constructed, the spatial distribution deviation of the adjusted environmental parameters and target parameters is monitored in real time, fan control parameters are dynamically corrected based on a reinforcement learning algorithm, a self-adaptive ventilation adjustment closed loop is formed, and rapid air volume redistribution under the emergency working condition is carried out. According to the method, dynamic data processing, process adaptive air volume calculation, distance perception distribution, partition regulation and control, reinforcement learning optimization and a multi-dimensional emergency response technology are fused, and double improvement of dynamic cooperation of main and auxiliary fans of the ultra-long tunnel, ventilation energy efficiency and construction safety is achieved.

The invention relates to the technical field of subway tunnel ventilation and smoke exhaust, and particularly discloses a fan movable type double-hole shared jet flow ventilation unit which comprises a shell and a control cabinet, the left side of the shell is located on a left line tunnel, the right side of the shell is located on a right line tunnel, and a fan section, an air pipe, an electric sliding rail and an air supply / exhaust port are arranged in the shell; the left line tunnel and the right line tunnel are both provided with segmented air pipes and air supply / exhaust outlets located in the front side and the rear side; the fan section comprises a two-way jet fan and a fan shell, the fan section is installed on the electric sliding rail, the electric sliding rail is transversely arranged along the tunnel, the fan section can be driven by the electric sliding rail to move to the segment position of the air pipe of the left line tunnel or the right line tunnel to complete butt joint, and air supply or air exhaust is achieved through the air supply / exhaust openings in the front side and the rear side. The fan section is installed on the electric sliding rail and can flexibly move between the left-line tunnel and the right-line tunnel, and the ventilation and smoke exhaust functions of single equipment on the double-hole tunnel are achieved.

The invention provides a tunnel fire monitoring and ventilation and smoke exhaust linkage control system. The tunnel fire monitoring and ventilation and smoke exhaust linkage control system comprises a tunnel environment and fire monitoring module, a data fusion processing module, a tunnel ventilation and smoke exhaust linkage control module and a remote monitoring and control management system module which are connected through a communication network. The data fusion processing module is configured with a D-S evidence theory algorithm and is used for receiving multi-source environment data, calculating basic probability distribution of data of each sensor, quantitatively evaluating a fire occurrence probability through a combination rule and generating a fire state judgment result; the tunnel ventilation and smoke exhaust linkage control module is used for receiving the fire state judgment result and determining the target wind speed according to the fire scale; a fuzzy PID control unit and a hysteresis control unit are arranged in the tunnel ventilation and smoke exhaust linkage control module. According to the method, the problem of high false alarm rate of traditional monitoring is solved, the engineering problem that discrete ventilation equipment is difficult to continuously and accurately control is solved, and the disaster prevention and reduction capability of the tunnel is remarkably improved.

The invention belongs to the technical field of tunnel construction, and particularly relates to a tunnel construction ventilation intelligent regulation and control method based on electrical automation. Distributed sensor arrays are deployed on a tunnel driving working face, a haulage roadway and a fan station through a multi-source heterogeneous sensor network, ventilation loads, environmental parameters, equipment states and construction event signals are collected in real time, and real-time and accurate original data support is provided for the system; a three-dimensional fluid mechanics-particulate matter diffusion coupling simulation model of a tunnel ventilation system is constructed, then a digital twin is used as a virtual training environment, an optimization instruction is converted into an electrical control signal, and a closed-loop PID-fuzzy coincidence controller dynamically compensates execution delay, controls operation of a fan and an air valve, and finally performs dynamic simulation on the tunnel ventilation system. And an execution result is fed back to the digital twin body for model calibration, so that finer and more efficient ventilation control is realized, the use problem in a high-altitude and alpine region environment is solved, the continuous effectiveness of ventilation regulation and control is effectively guaranteed, and the overall performance is improved.

The invention relates to the technical field of subway tunnel ventilation and smoke exhaust, and particularly discloses a self-adaptive double-tunnel shared ventilation and smoke exhaust device which comprises a shell and a control cabinet, the left side of the shell is located in a left tunnel, the right side of the shell is located in a right tunnel, and a bidirectional fan is arranged in the center of the shell; the left line tunnel and the right line tunnel are both provided with air supply / exhaust outlets located in the front end and the rear end of the shell, circular air pipes are arranged at the two ends of the two-way fan and connected with the air supply / exhaust outlets of the left line tunnel and the right line tunnel through Y-shaped air pipes, and the air supply / exhaust outlets in the front end share a front sliding baffle capable of sliding along the front rail. And the air supply / exhaust outlets at the rear end share a rear sliding baffle plate capable of sliding along the rear track. By sharing the ventilation and smoke exhaust equipment, the number and investment of the equipment can be greatly reduced, the operation cost can be reduced, the efficiency of the ventilation and smoke exhaust system can be improved, and reliable technical guarantee is provided for long-term operation and maintenance of the subway tunnel.

The utility model belongs to the technical field of tunnel ventilation, and aims to solve the problems that due to the influence of tunnel excavation sections and various construction racks, the space is limited and the material input is multiplied when two paths of independent air ducts are adopted in a gas tunnel. The multi-group parallel ventilation system for the gas tunnel comprises a standby ventilation unit and at least two main ventilation units, the standby ventilation unit comprises a standby fan and at least two standby air ducts, the standby air ducts are connected with the air outlet end of the standby fan, and the different standby air ducts are mutually independent; each main ventilation unit comprises a main fan and a main air duct connected to the air outlet end of the main fan, the different main ventilation units are mutually independent, and any main air duct communicates with a unique corresponding standby air duct; and the connecting part of the main air duct and the standby air duct is of an air return prevention structure. The system is simple in structure, and through the parallel ventilation structure, the standby fan can be immediately started to achieve ventilation in the tunnel after the main fan stops blowing due to maintenance, faults and the like.

The invention discloses a tunnel ventilation system and a control method thereof, and relates to the technical field of tunnel ventilation energy-saving control. According to the method, traffic data, environment data and equipment starting data in a tunnel are preprocessed and divided into data sets, a traffic prediction model based on LSTM and an environment prediction model based on full connection are constructed, and training is carried out through a root-mean-square error and an average absolute percentage error; and sequentially predicting traffic and environment data by using the model, and solving an optimal ventilation equipment combination through a sequential quadratic programming algorithm by taking energy consumption minimization as a target and environmental standard reaching as a constraint, and adjusting operation. The method has the advantages that advanced regulation and control are achieved through the two-stage prediction model, pollutants are prevented from exceeding the standard, and the air quality is guaranteed; dynamic training, multi-parameter optimization and a fault tolerance mechanism are combined, energy conservation and environment regulation and control are accurately balanced, meanwhile, the operation reliability and the intelligent level of the system are improved, and manual intervention is reduced.

The invention relates to the technical field of ventilation, in particular to a mixed ventilation device for construction in a subway tunnel, which comprises a first vertical shaft excavated and constructed on the tunnel, second vertical shafts for air exhaust are constructed on the left side and the right side of the first vertical shaft on the tunnel, and a plurality of axial flow fans are uniformly arranged in the tunnel. A jet fan is arranged in the first vertical shaft, and a negative pressure area is arranged on the lower side of the jet fan in an air inlet mode. The support assembly comprises an inner supporting frame, an outer mounting frame and a fixing frame and is used for fixing the jet fan in the negative pressure area; and the channel assembly communicates with the bottom of the jet fan and is used for increasing the flow speed of the air exhausted outwards from the negative pressure area. According to the tunnel ventilation system, air flow is effectively promoted, the concentration of silica dust, toxic gas, harmful steam and other pollutants in a tunnel can be remarkably reduced, and a healthier working environment is provided for operators by introducing fresh air and discharging vitiated air.

The invention relates to the technical field of tunnel ventilation, and discloses an internal combustion engine traction single inclined shaft railway tunnel ventilation mode determination method which comprises the steps that the piston wind speed when a train passes through a tunnel is calculated according to tunnel structure parameters and train operation parameters; determining the tail end position of the pollutant according to the piston wind speed; environment parameters are calculated according to the tunnel structure parameters, the train operation parameters and the pollutant tail end positions; dividing into three working conditions according to the position relation between the pollutant tail end position and the inclined shaft position, and matching corresponding ventilation mode combinations; for each ventilation mode in the ventilation mode combination, the total energy consumption of the system is calculated in combination with the piston wind speed and the environmental parameters; and selecting the ventilation mode with the minimum total energy consumption in the ventilation mode combination as a final scheme under the target working condition according to a comparison result of the total energy consumption of the system. According to the method, the appropriate ventilation mode can be accurately selected on the premise that pollutants are discharged in time, the ventilation energy consumption is reduced, and a calculation basis is provided for tunnel inclined shaft type ventilation.

The invention discloses a pumping and pressing combined mixed ventilation system for an extra-long tunnel and a construction method, and belongs to the technical field of tunnel ventilation. The extra-long tunnel comprises a flat pilot tunnel, a left tunnel and a right tunnel. The mixed ventilation system comprises a first axial flow fan, a second axial flow fan, a third axial flow fan, an air draft device, a detection device and a control device. Wherein the first axial flow fan is used for supplying fresh air to a tunnel face of a flat pilot tunnel, the second axial flow fan is used for supplying fresh air to a tunnel face of a left tunnel, the third axial flow fan is used for supplying fresh air to a tunnel face of a right tunnel, and the air draft device is used for exhausting dirty air in the left tunnel out of the tunnel; the detection device is used for detecting air parameters in the flat pilot tunnel, the left tunnel and the right tunnel, and the control device is used for controlling the first axial flow fan, the second axial flow fan, the third axial flow fan and the air draft device according to the detected air parameters. According to the method, a mixed ventilation mode combining pumping and pressing is adopted, the problem that the ventilation efficiency of an extra-long tunnel is greatly reduced along with deep tunneling is solved, and the cost is reduced.

The invention relates to the technical field of tunnel ventilation, and particularly discloses an energy-saving air duct design method, system, equipment and medium for a tunnel by using natural wind as ventilation power, and the method comprises the following steps: determining the direction and speed of the natural wind in the tunnel and the quantity of air passing through the energy-saving air duct according to natural wind data detected under the perennial meteorological conditions of the tunnel; determining the arrangement position of the energy-saving air duct according to the arrangement positions and geological characteristics of the electrical equipment, the control equipment and the fan; according to the section shape, the arrangement form and the wall surface material of the energy-saving air duct, the on-way resistance coefficient and the local resistance coefficient of the energy-saving air duct are determined; calculating the total resistance of the air duct, and determining the economic section of the energy-saving air duct according to the principle that the total resistance of the air duct is minimum. According to the method, natural wind is used as ventilation power for ventilation and energy conservation, the relation between the economic section and the total resistance loss is combined, the balance between civil engineering cost and the natural wind utilization rate is established, and a ventilation scheme which is more economical and higher in efficiency is obtained.

The utility model relates to a prefabricated middle partition wall structure of a tunnel ventilation inclined shaft. The prefabricated middle partition wall structure at least comprises a bottom supporting structure, a steel supporting assembly and a prefabricated modular wallboard. A positioning groove is formed in the top face of the bottom supporting structure, and the bottom of the steel supporting assembly is embedded into the positioning groove and fixed. The prefabricated modular wallboard is formed by splicing a plurality of prefabricated slabs, the adjacent prefabricated slabs are connected through tongue-and-groove structures which are matched in a concave-convex mode, and the tongue-and-groove joints are filled with sealing materials. The steel supporting assemblies are longitudinally arranged at intervals, and the tops of the steel supporting assemblies are fixed to a tunnel lining to form a steel-concrete combined structure for supporting the prefabricated modular wallboard. The steel supporting assembly and the prefabricated modular wall plate form a steel-concrete prefabricated structure, and the stability of the whole structure is enhanced. By adopting the autoclaved aerated concrete precast block material and the concave-convex groove embedded modular structure, the problems that the construction quality is difficult to control, the construction period is long, the on-way resistance of air flow is large and the like in the existing reinforced concrete mid-partition wall are solved.

The invention discloses a natural ventilation and mechanical ventilation interconvertible road tunnel ventilation system, which is arranged in a one-way driving road tunnel and comprises a tunnel road natural ventilation facility and a tunnel road mechanical ventilation facility, the tunnel road natural ventilation facility comprises a natural ventilation duct, a natural ventilation shaft and a natural ventilation valve; the tunnel road mechanical ventilation facility comprises a mechanical ventilation duct, a mechanical ventilation shaft, a mechanical ventilation valve and a ventilator. A natural ventilation opening of the one-way driving road tunnel is sequentially connected with a natural ventilation valve and a natural ventilation shaft through an air duct. The natural ventilation duct between the natural ventilation valve and the natural ventilation opening is sequentially connected with a tunnel mechanical ventilation valve, a ventilator and a mechanical ventilation shaft through a tee joint; the road tunnel mechanical ventilation valve and the ventilator are in a chain opening and closing relation. The invention provides a tunnel ventilation system which not only can meet the tunnel ventilation requirement, but also can solve the problems of land acquisition, landscape, environment and the like.

The invention provides a ventilation system for tunnel construction, relates to a tunnel ventilation technology, and particularly discloses a mounting main frame matched with a tunnel excavation section, a construction cavity is formed in the mounting main frame, and sealing structures used for sealing the construction cavity are arranged on the two sides of the mounting main frame; a driving mechanism is arranged on the mounting main frame and used for enabling the mounting main frame to move in the tunnel excavation direction; a plurality of ventilation pipes are mounted on the side, opposite to the tunnel excavation section, of the mounting main frame, a ventilation main pipe communicated with the ventilation pipes is mounted on the mounting main frame, and the ventilation main pipe is communicated with external air supply equipment; an air outlet communicated with the construction cavity is formed in the side wall, opposite to the tunnel excavation section, of the mounting main frame, a first pipeline is mounted on the mounting main frame, an air exhaust pipeline communicated with the air outlet is mounted in the construction cavity, and the output end of the first pipeline is opposite to the air outlet; a dust removal mechanism is arranged in the exhaust pipeline; and the air replacement efficiency in the area from the to-be-excavated face of the tunnel to the mounting main frame is improved.

The invention discloses a tunnel intelligent ventilation control method and system based on the Internet of Things, electronic equipment and a storage medium, and the method comprises the steps: collecting environment parameters in a tunnel, and determining a difference distribution condition and a local ventilation demand of a local environment region in the tunnel; based on the difference distribution condition, dividing the tunnel space into a plurality of independent control units, and performing feature extraction on the environmental parameters of each independent control unit to obtain a ventilation demand priority; on the basis of the ventilation demand priority, a regulation and control rule base based on a fuzzy control algorithm is constructed, and an air volume distribution scheme of each independent control unit is determined in combination with the local ventilation demand; based on the air volume distribution scheme, the independent control units are controlled to conduct ventilation, airflow interaction information of the adjacent independent control units is collected, and an airflow dynamic balance adjustment scheme is generated based on the airflow interaction information; and dynamically correcting the air volume of each independent control unit based on the airflow dynamic balance adjustment scheme to complete tunnel ventilation control.

The invention discloses a plateau long tunnel transverse channel angle optimization method, relates to the technical field of tunnel construction safety and operation, establishes a quantitative relation between a transverse channel angle and tunnel ventilation energy consumption, and provides a transverse channel optimal angle suggestion suitable for plateau weak surrounding rock. By constructing a stress-resistance-cost multi-factor coupling analysis model and combining rock mechanics and fluid dynamics numerical simulation, surrounding rock deformation, stress distribution and ventilation smoothness characteristics under five angle working conditions of 30 degrees, 40 degrees, 60 degrees, 70 degrees and 90 degrees are systematically compared and analyzed; the conclusion that the 60-degree crossing angle shows the optimal comprehensive performance in the aspects of relieving stress concentration of a triangular area, restraining deformation of a top plate and a bottom plate, improving ventilation efficiency and reducing operation cost is obtained, and theoretical basis and practical reference are provided for engineering design and optimization of the angle of the transverse channel of the plateau long tunnel.

The invention relates to the technical field of tunnel ventilation and safety, and discloses a tunnel cooling pipeline ventilation system which comprises a ventilation system body, the ventilation system body comprises a ventilation pipeline and a ventilation device, a grating is installed on the inner side face, close to an output port of the ventilation pipeline, of the ventilation pipeline, and a filter screen is laid on the side face, close to an output port of the ventilation system, of the grating. According to the device, when a filter screen is blocked, the wind energy on one side of the filter screen exceeds a rated value, the filter screen drives a grid to move towards the interior of the ventilation system, and the ventilation system is started to conduct ventilation; when the grid is in contact with the inductive switch and sends a corresponding early warning signal to the early warning system, the early warning system judges that the filter screen is blocked, stable working current is input into the adsorption dust removal device, the dust cleaning mechanism and the auxiliary dust cleaning assembly, and dust on the surface of the filter screen is automatically cleaned and recycled.

The utility model relates to a tunnel engineering rapid ventilation and dust fall device which comprises a fixing frame, an air guide barrel is installed at the bottom of the middle of the fixing frame, an air guide fan is fixedly installed in an inner cavity of the air guide barrel, water spraying pipes are evenly and fixedly arranged on the right side of the air guide fan, and a dustproof filter plate is fixedly arranged on the left side of the air guide fan. A cleaning plate is slidably arranged on one side of the dustproof filter plate, a first telescopic air guide pipe is fixedly connected to the left end of the air guide barrel, a second telescopic air guide pipe is arranged at the right end of the air guide barrel, lead screws are rotatably arranged at the two ends of the fixing frame, and the top ends of the first telescopic air guide pipe and the second telescopic air guide pipe are slidably connected with the lead screws through moving blocks. Normal ventilation in the tunnel is guaranteed, when dust appears, the air guide barrel can spray water mist, meanwhile, the position of an air suction inlet is changed, waste gas or dust at different positions in the tunnel is sucked in, the dust in the gas is filtered, the tunnel ventilation and dust falling speed is increased, and the practicability of the tunnel ventilation and dust falling device is improved.

The invention relates to a highway tunnel ventilation and smoke exhaust device and method based on storage. The device comprises a gas storage space, a flow guide channel, a partition baffle, an axial flow fan and a ventilation control module. The partition baffles are arranged in the tunnel discharge flue and divide the tunnel discharge flue into multiple sections of ventilation flues, each section of ventilation flue is provided with a communicating opening, and the ventilation flues are communicated with a tunnel space through the communicating openings; each section of ventilation flue is communicated with the gas storage space through a flow guide channel, and the axial flow fan is mounted in the flow guide channel; the ventilation control module is in control connection with an axial flow fan, and ventilation flues at two ends of the tunnel discharge flue are respectively provided with an air supply and exhaust tower; when the tunnel traffic flow reaches a threshold value, the gas storage space stores waste gas in the tunnel space and supplies fresh air to the tunnel space; and when the traffic flow of the tunnel is smaller than a threshold value, fresh air is stored in the air storage space, and stored waste gas is exhausted. Compared with the prior art, the ventilation system has the advantages of small environmental influence, low ventilation energy consumption and the like.

The invention relates to the field of tunnel structures, and discloses a ventilation system and method for a through parallel adit extra-long highway tunnel. The system comprises a flat pilot tunnel, an inclined shaft, a plurality of connection channels, a ventilation system and an intelligent control system, and the flat pilot tunnel is located between a left tunnel and a right tunnel and is parallel to the left tunnel and the right tunnel; the inclined shaft is respectively communicated with the flat pilot tunnel, the left tunnel and the right tunnel; the connecting channels are arranged at intervals in the length direction of the flat pilot tunnel and enable the flat pilot tunnel to be communicated with the left tunnel and the right tunnel. Comprising a concrete partition plate extending in the length direction of the flat pilot tunnel, the concrete partition plate divides the flat pilot tunnel into an upper layer and a lower layer, a flat guide air supply duct and a flat guide discharge flue are formed respectively, and the flat guide air supply duct is also used as an emergency evacuation channel; and the control module is used for controlling the ventilation system to strengthen the air supply function in an emergency state, so that a positive pressure environment higher than the left hole and the right hole is formed and maintained in the flat guide air supply duct. The method has the beneficial effects that the flat pilot tunnel has the evacuation function, and the emergency rescue capacity is improved.

The application discloses a noise reduction ventilation cooling device and a tunnel system, and belongs to the field of tunnel ventilation and cooling devices.The tunnel system comprises the noise reduction ventilation cooling device, and the noise reduction ventilation cooling device comprises a ventilation noise reduction assembly and a cooling assembly.During ventilation, air passes through the sound-absorbing through holes of the sound-absorbing members, so that the noise generated in the ventilation process of the tunnel system is absorbed.During cooling, the sound-absorbing members on the cavity walls of the ventilation cavity can absorb the noise generated in the cooling process of the heat exchange medium of the heat exchange circuit, so that a low noise level is maintained.Further, the noise reduction ventilation cooling device integrates noise reduction, ventilation and cooling, and is equivalent to a combined device for noise reduction, ventilation and cooling.The sound-absorbing members are used to reduce noise in the ventilation process and the cooling process, so that the tunnel space occupied by the noise reduction ventilation cooling device is reduced, and the problem that the noise reduction device and the heat dissipation ventilation facility occupy a large tunnel space in the prior art is solved.

The present invention discloses a method for determining the frictional resistance coefficient of a physical air duct for tunnel ventilation experiments, comprising the following steps: measuring the radius of the air outlet and the wind speed at the air outlet in its initial state; then removing adjustment rings sequentially from the outside inward, measuring the radius and wind speed of the air outlet each time an adjustment ring is removed, until all adjustment rings are removed; then calculating the pressure loss of the main body of the tunnel model, and finally calculating the frictional resistance coefficient of the main body of the tunnel model. This method not only solves the problem of difficulty in varying the frictional resistance coefficient of tunnel models in the laboratory, but also enables direct calculation of the frictional resistance coefficient based on a formula.

The present invention discloses a pumped-storage power station reservoir ventilation system and modification method based on an underground tunnel group. The ventilation system includes a regulating pool, vents, and ventilation ducts. The regulating pool is arranged at the lowest point of the tunnel group, with a cylindrical cavity at the bottom and a hemispherical cavity at the top. A regulating pool vent is provided at the top of the regulating pool, and a regulating pool ventilation duct is opened from the regulating pool vent to the ground. The ventilation ducts and vents are arranged in a coordinated manner. The vents are arranged at the tops of each tunnel in the underground tunnel group, and the ventilation ducts are used to connect the vents with the bottom surface. The ventilation ducts include a return air duct in the coal test mining area, a combined machine and rail duct in the coal test mining area, a No. 1 connecting tunnel ventilation duct, a passenger yard ventilation duct, a return air duct, a parking lot ventilation duct, a No. 2 connecting tunnel ventilation duct, an extended tunnel ventilation duct, and a regulating pool ventilation duct. The present invention can achieve timely exhaust and air replenishment functions, stabilize the hydraulic flow state of the underground tunnel group, and improve air quality and ventilation conditions.

The application relates to the technical field of tunnel ventilation and safety, and discloses a pipeline ventilation system for tunnel cooling, which comprises a ventilation system, wherein the ventilation system comprises a ventilation pipeline and a ventilation device; a grille is arranged on the inner side of the ventilation pipeline close to the outlet position of the ventilation pipeline; a filter screen is arranged on the side of the grille close to the outlet of the ventilation system; a prewarning system is arranged in the ventilation system; and the ventilation device is arranged in the ventilation pipeline. When the filter screen is blocked, the wind energy on one side of the filter screen exceeds the rated value, the filter screen drives the grille to move to the inside of the ventilation system, until the grille contacts the inductive switch and sends a corresponding prewarning signal to the prewarning system, the prewarning system judges that the filter screen is blocked, and the adsorption dust removal device, the dust cleaning mechanism and the auxiliary ash removal assembly input stable working current to automatically clean and recycle the dust on the surface of the filter screen.

The invention provides a method and a device for determining a tunnel ventilation on-way resistance coefficient in combination with a thermal potential difference, and the method comprises the steps: building a tunnel ventilation energy conservation model in combination with the influence of the thermal potential difference; the thermal potential difference is systematically calculated and necessary pressure correction is carried out based on field measurable parameters, so that the finally determined on-way resistance coefficient of tunnel ventilation can more accurately reflect the ventilation resistance characteristic under the actual working condition, and the calculation deviation caused by neglecting the air density change is effectively overcome; according to the method, the accuracy and reliability of determining the resistance coefficient in a complex environment, especially a tunnel with remarkable temperature difference and elevation difference are remarkably improved, and a more scientific and reliable technical basis is provided for precise design and efficient operation of a tunnel ventilation system.