Three-dimensional ventilation digital twinning system

Abstract

The invention provides a three-dimensional ventilation digital twinning system, which comprises a ventilation information investigation module, a three-dimensional visual modeling module, a ventilation system analysis module and a ventilation system optimization module, and is characterized in that the ventilation information investigation module collects underground ventilation system engineering, production operation, ventilation structures and ventilation equipment materials, combines mining area ventilation lines, and optimizes the ventilation system engineering, the production operation, the ventilation structures and the ventilation equipment materials; temperature, humidity, air volume and wind direction information parameter detection is carried out on main nodes of an underground ventilation system; the three-dimensional visual modeling module is used for establishing a three-dimensional visual model of the whole mine ventilation system according to 1: 1 in combination with ventilation information basic data and related materials; the ventilation system analysis module diagnoses and analyzes air volume distribution, air speed standard reaching, ventilation resistance distribution and a diesel oil equipment tail gas diffusion path in a multi-dimensional mode based on a ventilation numerical value analysis model; the change condition of the mine ventilation system can be scientifically and reasonably predicted, and the mine ventilation cost and working conditions can be quantitatively analyzed.

Description

Technical Field

[0001] The present invention relates to the technical field of underground ventilation reconstruction in mining areas, and in particular to a three-dimensional ventilation digital twin system. Background Art

[0002] In recent years, as the mining depth continues to deepen, the ventilation problems in the mines have become more and more prominent, mainly manifested in: ventilation system disorder, low fan efficiency, dirty air circulation, air leakage in goaf, insufficient air volume in deep areas, poor air quality underground, and the inability to quickly discharge blasting smoke and diesel equipment exhaust. Ventilation system defects are posing a serious challenge to mine production safety. As the mining depth of mines further deepens, if scientific methods are not adopted to effectively manage the mine ventilation system, ventilation problems will inevitably become a key factor that seriously restricts the improvement of mine production capacity and will always become a potential major hidden danger affecting mine safety production. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a three-dimensional ventilation digital twin system that can solve the background technical problems.

[0004] The present invention is implemented by the following method: a three-dimensional ventilation digital twin system, including a ventilation information investigation module, a three-dimensional visualization modeling module, a ventilation system analysis module and a ventilation system optimization module, wherein the ventilation information investigation module collects underground ventilation system engineering, production operations, ventilation structures and ventilation equipment materials, and combines the ventilation lines in the mine area to carry out temperature, humidity, air volume and wind direction information parameter detection on the main nodes of the underground ventilation system; the three-dimensional visualization modeling module combines the basic data of ventilation information and related materials to establish a three-dimensional visualization model of the entire mine ventilation system based on a 1:1 ratio; the ventilation system analysis module relies on the ventilation numerical analysis model to perform multi-dimensional diagnosis and analysis of the rationality and scientificity of air volume distribution, wind speed compliance, ventilation resistance distribution, diesel equipment exhaust diffusion path and structure layout parameters; the ventilation system optimization module combines computer three-dimensional graphics technology, precise measurement technology, three-dimensional modeling technology and big data analysis technology to establish a three-dimensional digital twin system for metal mine ventilation, which promotes the integration and fusion of all elements, all processes and all data of mine ventilation.

[0005] Furthermore, the ventilation information investigation module is further specified as follows: collecting underground ventilation system engineering, production operations, ventilation structures and ventilation equipment materials, combining the mine ventilation lines, carrying out temperature, humidity, air volume, wind direction information parameter detection on the main nodes of the underground ventilation system, and re-sorting the ventilation lines, air volume distribution, and required air volume information indicators to provide data support for the subsequent ventilation system analysis and evaluation, three-dimensional visualization model construction and ventilation system optimization.

[0006] Furthermore, the three-dimensional visualization modeling module is further specified as follows: combining the basic data of ventilation information and related materials, a three-dimensional visualization model of the entire mine ventilation system is established based on a 1:1 ratio, and the model space and data are calibrated by combining ultrasonic wind measurement and three-dimensional laser scanning, and reliability testing is performed to ensure that the model error is less than 5%, thereby realizing three-dimensional visualization display and management of ventilation environment information and ventilation equipment and facilities.

[0007] Furthermore, the ventilation system analysis module is further specified as follows: relying on the ventilation numerical analysis model, a multi-dimensional diagnosis and analysis is performed on the rationality and scientificity of air volume distribution, wind speed compliance, ventilation resistance distribution, diesel equipment exhaust diffusion path, and structure layout parameters, the reliability and disaster resistance of the ventilation system are evaluated, and the problems and optimization directions of the ventilation system are proposed.

[0008] Furthermore, the ventilation system optimization module is further specified as follows: combining the current status analysis and medium- and long-term planning of the ventilation system, and combining computer three-dimensional graphics technology, precise measurement technology, three-dimensional modeling technology and big data analysis technology, a three-dimensional digital twin system for metal mine ventilation is established, which promotes the integration and fusion of all elements, all processes and all data of mine ventilation, and provides technical reserves for deep mining ventilation optimization, high-temperature heat damage control and intelligent mine construction.

[0009] The beneficial effects of the present invention are as follows: the present invention takes "precise investigation of ventilation information - three-dimensional visualization modeling construction - ventilation system analysis and evaluation - ventilation system optimization and simulation analysis" as the idea, forming a three-dimensional ventilation digital twin system based on three-dimensional visualization modeling of metal mine ventilation system and using ventilation system optimization numerical simulation analysis as the means; using the three-dimensional ventilation digital twin system to perform mine ventilation system optimization analysis and scheme transformation analysis can scientifically and reasonably predict the changes in the mine ventilation system, quantitatively analyze the mine ventilation cost and working conditions, reduce the blindness of ventilation system optimization and transformation, enhance the purposefulness and scientificity of ventilation system optimization and transformation, not only reduce the cost of ventilation system transformation, but also improve the scientific decision-making ability of metal mine managers, ensure the safety and reliability of metal mine ventilation system, and ensure safe production of metal mines; on the one hand, it can directly improve the underground working environment, provide protection for the physical and mental health of underground workers, and improve labor efficiency; on the other hand, it can improve the operating efficiency of complex mine ventilation systems, by increasing the effective air volume rate, while increasing the effective air volume at the work site, reducing redundant and conflicting fan arrangements, and achieving energy saving and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a system flow chart of the present invention.

[0011] Figure 2 Reliability test flow chart. DETAILED DESCRIPTION

[0012] The present invention will be further described below in conjunction with the accompanying drawings.

[0013] See also Figure 1 As shown, the present invention provides an embodiment: a three-dimensional ventilation digital twin system, including a ventilation information investigation module, a three-dimensional visualization modeling module, a ventilation system analysis module and a ventilation system optimization module, wherein the ventilation information investigation module collects underground ventilation system engineering, production operations, ventilation structures and ventilation equipment materials, and combines the ventilation lines in the mine area to carry out temperature, humidity, air volume and wind direction information parameter detection on the main nodes of the underground ventilation system; the three-dimensional visualization modeling module combines the basic data of ventilation information and related materials to establish a three-dimensional visualization model of the entire mine ventilation system based on a 1:1 ratio; the ventilation system analysis module relies on the ventilation numerical analysis model to perform multi-dimensional diagnosis and analysis of the rationality and scientificity of air volume distribution, wind speed compliance, ventilation resistance distribution, diesel equipment exhaust diffusion path and structure layout parameters; the ventilation system optimization module combines computer three-dimensional graphics technology, precise measurement technology, three-dimensional modeling technology and big data analysis technology to establish a three-dimensional digital twin system for metal mine ventilation, which promotes the integration and fusion of all elements, all processes and all data of mine ventilation.

[0014] 1. Accurate investigation of mine ventilation information

[0015] Materials on underground ventilation system engineering, production operations, ventilation structures and ventilation equipment were collected. Combined with the ventilation routes in the mining area, information parameter detections such as temperature, humidity, air volume and wind direction were carried out on the main nodes of the underground ventilation system. Information indicators such as ventilation routes, air volume distribution and required air volume were re-sorted to provide data support for the subsequent analysis and evaluation of the ventilation system, the construction of a three-dimensional visualization model and the optimization of the ventilation system.

[0016] 2. Construction of 3D visualization model of ventilation system

[0017] Combined with the basic data of ventilation information and related materials, a 1:1 three-dimensional visualization model of the entire mine ventilation system was established. The model space and data were calibrated using ultrasonic wind measurement and three-dimensional laser scanning. Reliability tests were performed to ensure that the model error was less than 5%, thus realizing three-dimensional visualization and management of ventilation environment information and ventilation equipment and facilities.

[0018] 3. Ventilation system analysis and evaluation

[0019] Relying on the numerical analysis model of ventilation, a multi-dimensional diagnosis and analysis was conducted on the rationality and scientificity of parameters such as air volume distribution, wind speed compliance, ventilation resistance distribution, diesel equipment exhaust diffusion path, and structure layout. The reliability and disaster resistance of the ventilation system were evaluated, and the problems and optimization directions of the ventilation system were proposed, providing a reference for the optimization of the ventilation system.

[0020] 4. Ventilation system optimization and simulation analysis

[0021] Combining the analysis of the current status of the ventilation system and the mid- and long-term planning, this paper proposes three ventilation system optimization schemes from the perspectives of adjusting the air intake and return routes, adjusting the fans, and adding dedicated return air shafts, focusing on the core issues such as insufficient air volume in the deep middle section of the mining area, slow discharge of underground blasting smoke and diesel engine exhaust, etc. The paper analyzes the ventilation optimization effect and technical and economic feasibility of each scheme. On the basis of making full use of existing equipment, the optimization scheme greatly improves the effective air volume supply and air quality level in the deep middle section, and the effective air volume in the deep middle section is increased by nearly 4 times, and the time for blasting smoke to be discharged from the wellhead is greatly reduced. It provides technical guidance for the future optimization and design of the ventilation system in the mining area.

[0022] Through technical means such as "field investigation-model construction-analysis and evaluation-optimization analysis", combined with computer three-dimensional graphics technology, precise measurement technology, three-dimensional modeling technology and big data analysis technology, a three-dimensional digital twin system for metal mine ventilation was established, which promoted the integration and fusion of all elements, all processes and all data of mine ventilation, and provided technical reserves for deep mining ventilation optimization, high temperature heat damage control and intelligent mine construction.

[0023] Realize multivariate data fusion and establish a three-dimensional visual ventilation numerical analysis model

[0024] The underground mine contains more than 20 middle sections and subsections, which is a relatively complex ventilation network. Traditional ventilation system diagrams and data analysis cannot intuitively understand the operating dynamics of the underground ventilation system, making ventilation management and optimization difficult.

[0025] See also Figure 2 As shown in the figure, in order to promote the accurate analysis and visual management of the ventilation system, based on the schematic diagram of the mine ventilation system and the plan drawings of each middle section, the three-dimensional visualization model was constructed using computer software technology. The reliability test made the ventilation system model data error less than 5%, which is fully in line with the current status of the ventilation system. The accuracy meets the needs of further formulating the optimization plan of the ventilation system, and realizes the three-dimensional visualization display and management of ventilation environment information and ventilation equipment and facilities, providing a basis for scientific and effective management of ventilation.

[0026] Ultrasonic wind measurement and 3D laser scanning technology to improve data reliability

[0027] Wind speed is the most important basic parameter in the field of ventilation safety. Accurate monitoring of wind speed plays a vital role in understanding the distribution of air volume in the mine, formulating scientific wind flow control plans, and making emergency rescue decisions. However, due to the constraints of sensor technology and the structure of the wind flow velocity field in the tunnel, the errors of traditional wind measurement and online wind speed monitoring are large, which seriously restricts the development of mine ventilation towards digitalization and intelligence.

[0028] The wind flow distribution in the cross section shows that the wind speed is the highest at the center point and gradually decreases towards the four walls of the tunnel. Wind surveyors usually use the four-wire method and the six-wire method to continuously measure the wind to improve the accuracy of wind speed measurement. At the same time, the current metal mine environmental monitoring system generally uses the method of hanging wind speed sensors at fixed points on the roof to monitor wind speed, which cannot accurately monitor the average wind speed. This project uses mobile ultrasonic wind measurement technology to move the ultrasonic wind speed sensor, conduct linear wind measurement at multiple points across the cross section, and calculate the average value to improve the accuracy of wind measurement.

[0029] Three-dimensional laser scanning technology is used in the measurement of ventilation system resistance and the construction of three-dimensional visualization models. The circumference and area of ​​the wind section of the tunnel are accurately measured, and wind resistance measurement and correction data based on the loop method are established. Local corrections are made to the spatial coordinates of the ramp and each middle section of the tunnel, providing accuracy assurance for model construction and numerical analysis.

[0030] Multi-dimensional ventilation system analysis and evaluation, and formulation of ventilation system optimization direction

[0031] Multi-dimensional ventilation system analysis and evaluation

[0032] Relying on the established mine area ventilation status model and measured data, a multi-dimensional analysis was conducted on the rationality and scientificity of parameters such as air volume distribution, wind speed compliance, ventilation resistance distribution, diesel equipment exhaust diffusion path, and structure layout. Problems such as insufficient total air volume, unreasonable distribution, unscientific ventilation path, airflow short circuit, and air leakage were diagnosed, pointing out the direction for optimizing the ventilation system.

[0033] The following is described by a specific embodiment:

[0034] The main problems of mine ventilation system are:

[0035] (1) Insufficient total air volume: The required air volume in the mining area is 57.71m 3 / s, the measured total return air volume is 25.2m 3 / s, it is necessary to increase the total air volume and improve the effective air volume rate to ensure the air supply for working locations in deep areas.

[0036] (2) Wind speed does not meet the standard: The middle section of the tunnel below +50m is basically in a breeze state, and fresh air mainly enters the mine from the new and old ramps at 252m. After passing the middle section of 205, more than half of the fresh air has been lost.

[0037] (3) Unreasonable ventilation path: The oil smoke on the upper part of the main ramp flows down the ramp and affects all deep areas of the mining area. The working environment in the deep area is poor and the air intake route needs to be adjusted.

[0038] (4) Large ventilation resistance: The tunnels with large wind resistance are mainly: +252m new and old ramp air inlet section, each middle return air shaft, +205m special return air shaft, +252m special return air shaft, +300m middle return air shaft, +300m return air level. Under the condition of low total air supply in the current mine, the total system resistance is less than 700Pa. However, due to the tortuous main return air line of the mine and the small cross-sectional area, especially in the +300m return air level and many special return air shafts, the effective cross-sectional area is less than 5m2. If the total air supply of the mine is increased, the ventilation resistance of the system will rise rapidly because the system resistance is proportional to the square of the air volume.

[0039] (5) Imperfect ventilation system: There is a large-scale circulation of polluted air underground in the mining area. The system has not formed a complete air inlet and return air circuit. The air inlet and return air routes are intertwined, affecting the discharge of exhaust gas and blasting smoke from underground oil production machines.

[0040] According to the results of system analysis and evaluation, the overall direction of ventilation system optimization was proposed: by re-planning the air inlet and return air lines, changing the current air inlet route that mainly relies on the new and old ramps of +252m; adjusting the fan configuration, changing the ventilation capacity of the upper fan of the main return air line to be smaller than the ventilation capacity of the lower fan; strictly managing the dedicated return air route to avoid the formation of airflow short circuits caused by the connection between the upper middle section of the air inlet and return air lines.

[0041] According to the current situation and existing problems of the mine ventilation system, three feasible ventilation optimization schemes were designed, and technical and economic comparisons were made to finally determine the ventilation system adjustment scheme to be adopted.

[0042] Solution 1: Build a dedicated return air duct + dredge and increase the air inlet channel

[0043] Plan the main return air route, strengthen the isolation between the main return air route and the middle sections and the main air intake route, dredge the 350m horizontal tunnel and the 205m middle section blind inclined shaft as the air intake roadway, reduce the air intake ratio of the main inclined ramp, and do not change the current base station location and fan configuration for the time being.

[0044] A dedicated return air route was constructed, and the 252m new ramp, 252 old ramp, 350m horizontal tunnel and 205m middle blind inclined shaft were used as air intake tunnels. Without changing the position and configuration of the existing fans, the air intake in the deep area of ​​the mine was significantly improved. The proportion of air intake in the main ramp for transportation purposes was significantly reduced to 37.3%. It can be clearly seen from (d) that the impact of the blasting smoke on the deep part of the main ramp was significantly reduced, and the time for the blasting smoke in the 0m middle section to be discharged from the wellhead was reduced from 32.5 minutes to 16.9 minutes. It can be seen that the construction of a dedicated return air channel can reduce the short circuit and leakage of the wind flow in the middle section above the 205m middle section, which has a very obvious improvement on the ventilation in the deep area.

[0045] The limitation of Scheme 1 is that the return air line below the middle section of 252m is difficult to maintain, requiring strict management of the 30KW fan points at +110m and +150m and the structures along the way. In addition, due to the limitations of the existing fan configuration and the roadway section, the maximum return air capacity of this scheme system is difficult to exceed 30m. 3 / s.

[0046] Solution 2: Solution 1 + Adjust the fan position

[0047] On the basis of Plan 1, a new dedicated return air shaft is excavated on Line 247. The shaft connects the middle section of 0m to the middle section of 205m and is connected to the upper return air tunnel of 205m, forming a dedicated return air path for the mine.

[0048] Compared with Scheme 1, Scheme 2 can improve the return air capacity of the ventilation system by 23.3%, and the total return air capacity of the ventilation system can be significantly improved. The fresh air intake in the deep area below the middle section of +110m is also improved, and the air intake at 20m below 110m of the ramp reaches 24.6m 3 / s, an increase of 23.6%, and a more obvious effect on the improvement of deep mine ventilation. In terms of improving the environment of deep mine working points, the advantages of Scheme 2 are more obvious, and the exhaust time of 0m mid-section blasting smoke + 300m cave entrance is further reduced to 12.45 minutes.

[0049] Although the fan operation status has become significantly more reasonable and the ventilation capacity of the wind network has been further improved through the adjustment of Plan 2, the performance mismatch between the 37kw fan and the 90kw fan on the same main return air line is still an obstacle to further improving the ventilation capacity of the wind network.

[0050] Option 3: Option 2 + adding a dedicated return air shaft

[0051] The return air tunnel is maintained in the middle section of 205 and above, a dedicated return air tunnel is constructed, and a new dedicated return air shaft is excavated on Line 247. The shaft connects the middle section of 0m to the middle section of 205m, and is connected to the upper return air tunnel of 205m, forming a dedicated return air path for the mine.

[0052] Plan three involves excavating a new dedicated return air shaft and swapping the positions of the existing 90kw and 37kw fans. The mine ventilation system can increase the total system air volume by 38.9% without shutting down the two 30KW fans in the +110m and +150m middle sections and without purchasing new fans. The system effective air volume rate reaches 70.6%, and the fresh air intake below the +110m middle section is increased by 3.9 times compared with the current system. The time for blasting smoke to be discharged from the wellhead in the 0m middle section is greatly reduced to 5.6 minutes, which greatly shortens the smoke exhaust time after blasting on the working face and improves the shift turnover rate.

[0053] This solution makes full use of existing fan equipment in the case of a newly excavated dedicated return air shaft, greatly increasing the effective air volume of the mine, while the fan operates in a high-efficiency energy-saving range. At the same time, the ventilation system's air inlet and return air lines are generally separated, which is more conducive to the discharge of deep polluted air and improving deep air quality.

[0054] Through comparative analysis of three optimization schemes, focusing on the core issues such as insufficient air volume in the deep middle section of the mining area, slow discharge of underground blasting smoke and diesel engine exhaust, it is proposed to build a dedicated return air channel, improve the operating efficiency of the fan, and increase the effective air volume rate of the ventilation system, thereby greatly improving the effective air volume supply and air quality in the deep middle section. Through scheme optimization, on the basis of making full use of existing equipment, the effective air volume below the +110m middle section is increased by nearly 4 times, and the time for the blasting smoke in the deep 0m middle section to be discharged from the wellhead is reduced from 32.5 minutes to 5.6 minutes, thereby greatly shortening the smoke exhaust time after blasting on the working face and improving the shift turnover rate.

[0055] Formed a three-dimensional ventilation digital twin system and technical architecture for metal mines

[0056] The construction of a three-dimensional ventilation digital twin system is a systematic project. The realization of a fully automatic three-dimensional ventilation digital twin system depends on the construction of hardware infrastructure based on sensor technology, real-time communication technology, three-dimensional graphics technology, artificial intelligence technology and big data technology.

[0057] At present, through the construction and operation analysis of the three-dimensional visualization model, a three-dimensional ventilation digital twin system for metal mines has been initially formed under the condition of imperfect technical facilities. In order to comprehensively and systematically grasp the operating status of the underground ventilation system and realize the goal of mine ventilation on demand, the overall technical architecture of the three-dimensional ventilation digital twin system is proposed. The system consists of two parts: the physical system and the twin system. The ventilation three-dimensional twin system is a digital mirror of the ventilation physical system. The physical system operation status data corrects the twin system. The twin system gives reasonable air adjustment instructions based on production needs. The instructions further adjust the operation status of the physical system. This is repeated in time to discover the hidden dangers of the ventilation system, reduce blind air adjustment, and realize mine ventilation on demand, which promotes the integration and fusion of all elements, all processes, and all data of mine ventilation, helping enterprises save energy and increase efficiency.

[0058] In summary, based on the actual measurement of ventilation parameters of the mine ventilation system, a three-dimensional ventilation digital twin system architecture is adopted, and through multivariate data fusion, a three-dimensional visual ventilation numerical analysis model of the mine area is established. The model accurately reflects the ventilation status of the mine area, and realizes the three-dimensional visual display and management of ventilation environment information and ventilation equipment and facilities, providing a basis for scientific and effective ventilation management.

[0059] Through the three-dimensional ventilation model, the rationality of the current mine ventilation system, the distribution of ventilation resistance, etc. are quantitatively analyzed, and the bottlenecks of the current ventilation system are quantitatively analyzed and displayed in three-dimensional graphics, so as to determine the optimization direction and dimension of the ventilation system, and propose overall optimization plans such as re-planning the air inlet and return air lines, adjusting the fan operating blade angle to match the ventilation capacity of each level of stations, and designing a dedicated return air shaft from 0m to +205m.

[0060] Through comparative analysis of three optimization schemes, focusing on the core issues such as insufficient air volume in the deep middle section of the mining area, slow discharge of underground blasting smoke and diesel engine exhaust, it is proposed to build a dedicated return air channel, improve the operating efficiency of the fan, and increase the effective air volume rate of the ventilation system, thereby greatly improving the effective air volume supply and air quality level in the deep middle section. Through scheme optimization, on the basis of making full use of existing equipment, the effective air volume below the +110m middle section is increased by nearly 4 times, and the time for the blasting smoke in the deep 0m middle section to be discharged from the wellhead is reduced from 32.5 minutes to 5.6 minutes, thereby greatly shortening the smoke exhaust time after blasting on the working face and improving the shift turnover rate. This idea provides a technical reference for the optimization of mine ventilation systems, deep heat damage control, and capacity improvement.

[0061] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A three-dimensional ventilation digital twin system, characterized in that: It includes a ventilation information investigation module, a three-dimensional visualization modeling module, a ventilation system analysis module and a ventilation system optimization module. The ventilation information investigation module collects materials on underground ventilation system engineering, production operations, ventilation structures and ventilation equipment, and combines the ventilation lines in the mine area to carry out temperature, humidity, air volume and wind direction information parameter detection on the main nodes of the underground ventilation system; the three-dimensional visualization modeling module combines the basic data of ventilation information and related materials to establish a three-dimensional visualization model of the entire mine ventilation system based on a 1:1 ratio; the ventilation system analysis module relies on the ventilation numerical analysis model to conduct multi-dimensional diagnosis and analysis of the rationality and scientificity of air volume distribution, wind speed compliance, ventilation resistance distribution, diesel equipment exhaust diffusion path and structure layout parameters; the ventilation system optimization module combines computer three-dimensional graphics technology, precise measurement technology, three-dimensional modeling technology and big data analysis technology to establish a three-dimensional digital twin system for metal mine ventilation, which promotes the integration and fusion of all elements, all processes and all data of mine ventilation.

2. A three-dimensional ventilation digital twin system according to claim 1, characterized in that: The ventilation information investigation module is further specified as follows: collecting information on underground ventilation system engineering, production operations, ventilation structures and ventilation equipment materials, combining the mine ventilation lines, conducting temperature, humidity, air volume and wind direction information parameter detection on the main nodes of the underground ventilation system, and re-sorting the ventilation lines, air volume distribution, and required air volume information indicators to provide data support for the subsequent ventilation system analysis and evaluation, three-dimensional visualization model construction and ventilation system optimization.

3. A three-dimensional ventilation digital twin system according to claim 1, characterized in that: The three-dimensional visualization modeling module is further specified as follows: combining the basic data of ventilation information and related materials, a three-dimensional visualization model of the entire mine ventilation system is established based on a 1:1 ratio, and the model space and data are calibrated by combining ultrasonic wind measurement and three-dimensional laser scanning. After passing the reliability test, it is ensured that the model error is less than 5%, thereby realizing the three-dimensional visualization display and management of ventilation environment information and ventilation equipment and facilities.

4. A three-dimensional ventilation digital twin system according to claim 1, characterized in that: The ventilation system analysis module is further specified as follows: relying on the ventilation numerical analysis model, a multi-dimensional diagnosis and analysis is performed on the rationality and scientificity of air volume distribution, wind speed compliance, ventilation resistance distribution, diesel equipment exhaust diffusion path, and structure layout parameters, the reliability and disaster resistance of the ventilation system are evaluated, and the problems and optimization directions of the ventilation system are proposed.

5. A three-dimensional ventilation digital twin system according to claim 1, characterized in that: The ventilation system optimization module is further specified as follows: combining the current status analysis and medium- and long-term planning of the ventilation system, and combining computer three-dimensional graphics technology, precise measurement technology, three-dimensional modeling technology and big data analysis technology, a three-dimensional digital twin system for metal mine ventilation is established, which promotes the integration and fusion of all elements, all processes and all data of mine ventilation, and provides technical reserves for deep mining ventilation optimization, high temperature heat damage control and intelligent mine construction.

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