Intelligent ventilation control method

Abstract

The application discloses a kind of intelligent ventilation control methods, comprising: test stage, the following test process is repeatedly executed multiple times: harmful gas concentration data in underground tunnel is collected by harmful gas sensor, controller compares each harmful gas concentration data with first concentration threshold, if exceeds, then control fan starts, when the latest received one data falls below second concentration threshold, control fan is closed, the length of time t1 between the first data received to the first data exceeding first concentration threshold is calculated, and the length of time t2 from fan start to fan close is calculated, the difference Δt between t1 and t2 is calculated;The average of multiple Δt is used as starting compensation time t;Implementation stage: controller calculates the length of time T between the first data received to the latest received one data, and controls fan to start when the length of time T reaches starting compensation time t.The application can realize the efficient control to harmful gas content.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground construction, and particularly relates to an intelligent ventilation control method. BACKGROUND

[0002] In the process of underground tunnel construction, the ventilation system plays a crucial role. Because various harmful gases such as carbon monoxide and hydrogen sulfide are generated during the construction process, if they cannot be effectively discharged in time, they will pose a serious threat to the health of construction personnel and may even cause safety accidents. The traditional ventilation control method usually ventilates when the harmful gas concentration reaches a threshold value, and it still takes a period of time to disperse the harmful gas, resulting in that the harmful gas concentration cannot be quickly reduced, which affects the processing efficiency of the harmful gas. Therefore, an intelligent ventilation control method is urgently needed, which can start in advance according to the diffusion of harmful gas, effectively control the diffusion of harmful gas, and improve the ventilation efficiency. SUMMARY

[0003] An object of the present application is to solve at least the above problems and / or deficiencies, and to provide at least the advantages described later.

[0004] An object of the present application is to provide an intelligent ventilation control method, which can improve the ventilation efficiency of the underground tunnel and realize efficient control of the harmful gas content.

[0005] In order to achieve these objects and other advantages according to the present application, an intelligent ventilation control method is provided, the ventilation system is used for air supply to the underground tunnel, the ventilation system includes a harmful gas sensor arranged in the underground tunnel, a fan arranged in a ventilation duct, and a controller electrically connected with the harmful gas sensor and the fan respectively, one end of the ventilation duct is communicated to the underground tunnel, and the other end is communicated to the outside; the method comprises:

[0006] Step one, test phase, repeat the following test process: through the harmful gas sensor every set interval of time interval collection in the underground tunnel of a harmful gas concentration data, each harmful gas concentration data is sent to the controller, the controller compares each harmful gas concentration data with a preset first concentration threshold, if the latest received one harmful gas concentration data exceeds the first concentration threshold, the controller controls the fan to start, through the ventilation duct to the underground tunnel air supply, and the controller continues to receive harmful gas concentration data, when the controller latest received one harmful gas concentration data drops to the second concentration threshold, the controller controls the fan to close, the controller calculates the time length t1 from the first received harmful gas concentration data to the first harmful gas concentration data exceeding the first concentration threshold, and calculates the time length t2 from the fan starting to the fan closing, calculates the difference Δt between t1 and t2, wherein the first concentration threshold is greater than the second concentration threshold; after repeating the above test process, a plurality of Δt is calculated, and the average of the plurality of Δt is taken as the starting compensation time t;

[0007] Step two, implementation phase: through the harmful gas sensor every set interval collection in the underground tunnel of a harmful gas concentration data, each harmful gas concentration data is sent to the controller, the controller calculates the time length T from the first received harmful gas concentration data to the latest received one harmful gas concentration data, when the time length T reaches the starting compensation time t, the controller controls the fan to start, through the ventilation duct to the underground tunnel air supply, when the controller latest received one harmful gas concentration data drops to the second concentration threshold, the controller controls the fan to close.

[0008] Preferably, in the intelligent ventilation control method, in step one, according to the temperature in the underground tunnel, three levels are divided, the three levels include low temperature level, medium temperature level and high temperature level, three first concentration thresholds and three second concentration thresholds are set for the three levels, with the increase of the temperature of the three levels, the first concentration threshold corresponding to each level gradually decreases, and the second concentration threshold corresponding to each level gradually decreases; according to the temperature of the underground tunnel, the corresponding temperature level, the corresponding first concentration threshold and the corresponding second concentration threshold of the test phase are determined, and a corresponding starting compensation time t is calculated for each temperature level; in step two, according to the temperature of the underground tunnel, the corresponding temperature level and the corresponding starting compensation time t are determined.

[0009] Preferably, in the intelligent ventilation control method, the low temperature level is below 10 DEG C; the medium temperature level is between 10 DEG C and 25 DEG C; and the high temperature level is above 25 DEG C.

[0010] Preferably, in the intelligent ventilation control method, in the step one, a plurality of test stages are designed for a plurality of working conditions, and a corresponding start compensation time t is calculated for each working condition, wherein each working condition corresponds to a harmful gas diffusion mode; and in the step two, the working condition corresponding to the implementation stage is determined in advance, and the corresponding start compensation time t is selected according to the determined working condition.

[0011] Preferably, in the intelligent ventilation control method, the plurality of working conditions include excavation operation, blasting operation, supporting operation and underground tunnel auxiliary equipment installation operation.

[0012] Preferably, in the intelligent ventilation control method, in the step one, the controller controls the fan to work at a set rotating speed; and in the step two, the controller controls the starting stage of the fan, the controller controls the fan to work at the set rotating speed until a latest received harmful gas concentration data drops to 80% of the second concentration threshold, and then the controller controls the fan to work at 50% of the set rotating speed.

[0013] Preferably, in the intelligent ventilation control method, in the step one, the second concentration threshold is 20-30% of the first concentration threshold.

[0014] Preferably, in the intelligent ventilation control method, in the step two, the time length T between the first received harmful gas concentration data and the latest received harmful gas concentration data reaches the start compensation time t, including that the time length T between the first received harmful gas concentration data and the latest received harmful gas concentration data is equal to or more than the start compensation time t.

[0015] The present application at least has the following advantages:

[0016] The application provides a kind of intelligent ventilation control method, the ventilation system is used to supply air to underground tunnel, the ventilation system includes harmful gas sensor arranged in the underground tunnel, fan arranged in ventilation duct and controller electrically connected with harmful gas sensor and fan respectively, one end of the ventilation duct is communicated to the underground tunnel, and the other end is communicated to the outside;The method comprises: step one, test phase, repeatedly execute the following test process: harmful gas concentration data in the underground tunnel is collected by the harmful gas sensor every set time interval, each harmful gas concentration data is sent to the controller, the controller compares each harmful gas concentration data with a preset first concentration threshold value, if the latest received one harmful gas concentration data exceeds the first concentration threshold value, the controller controls the fan to start, and supplies air to the underground tunnel through the ventilation duct, and the controller continuously receives harmful gas concentration data, when the latest received one harmful gas concentration data of the controller drops below the second concentration threshold value, the controller controls the fan to close, the controller calculates the time length t1 between the first received harmful gas concentration data and the first harmful gas concentration data exceeding the first concentration threshold value, and calculates the time length t2 from the fan starting to the fan closing, calculates the difference Δt between t1 and t2, wherein the first concentration threshold value is greater than the second concentration threshold value;After repeating the above test process for several times, a plurality of Δt is calculated, and the average value of a plurality of Δt is taken as the start compensation time t;Step two, implementation phase: harmful gas concentration data in the underground tunnel is collected by the harmful gas sensor every set time interval, each harmful gas concentration data is sent to the controller, when the time length T from the first received harmful gas concentration data to the latest received one harmful gas concentration data reaches the start compensation time t, the controller controls the fan to start, and supplies air to the underground tunnel through the ventilation duct, when the latest received one harmful gas concentration data of the controller drops below the second concentration threshold value, the controller controls the fan to close.The application can calculate a start compensation time according to the diffusion of harmful gas, and the fan is started in advance according to the start compensation time in the implementation phase, so as to control the diffusion of harmful gas in advance, avoid high concentration of harmful gas, and improve ventilation efficiency.

[0017] Other advantages, objects, and features of the application will be understood or apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The flow chart of the intelligent ventilation control method provided by the application. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0020] like Figure 1 As shown, this invention provides an intelligent ventilation control method. The ventilation system is used to supply air to an underground tunnel. The ventilation system includes a harmful gas sensor installed in the underground tunnel, a fan installed in a ventilation duct, and a controller electrically connected to the harmful gas sensor and the fan respectively. One end of the ventilation duct is connected to the underground tunnel, and the other end is connected to the outside. The method includes:

[0021] Step 1, Experimental Phase: The following experimental process is repeated multiple times: Harmful gas concentration data for one gas in the underground tunnel is collected at set time intervals using the harmful gas sensor. Each harmful gas concentration data is sent to the controller. The controller compares each harmful gas concentration data with a preset first concentration threshold. If the most recently received harmful gas concentration data exceeds the first concentration threshold, the controller controls the fan to start, supplying air to the underground tunnel through the ventilation duct. The controller continuously receives harmful gas concentration data. When the most recently received harmful gas concentration data drops below the second concentration threshold, the controller controls the fan to shut down. The controller calculates the time length t1 between the first received harmful gas concentration data and the first harmful gas concentration data exceeding the first concentration threshold, and the time length t2 between the fan starting and shutting down. The difference Δt between t1 and t2 is calculated, where the first concentration threshold is greater than the second concentration threshold. After repeating the above experimental process multiple times, multiple Δt values ​​are calculated, and the average of these multiple Δt values ​​is used as the start-up compensation time t.

[0022] Step 2, Implementation Phase: The hazardous gas sensor collects hazardous gas concentration data in the underground tunnel at regular intervals and sends each hazardous gas concentration data to the controller. The controller calculates that when the time length T between the first received hazardous gas concentration data and the latest received hazardous gas concentration data reaches the start-up compensation time t, the controller controls the fan to start and deliver air to the underground tunnel through the ventilation duct. When the latest received hazardous gas concentration data drops below the second concentration threshold, the controller controls the fan to shut down.

[0023] In the present application, the length of time t1 between the first harmful gas concentration data received by the controller and the first harmful gas concentration data exceeding the first concentration threshold value reflects the diffusion of the harmful gas, and the length of time t2 between the start of the fan and the stop of the fan reflects the time required for the fan to disperse the harmful gas. In the prior art, the ventilation control method generally ventilates when the harmful gas concentration reaches the threshold value, and still requires a period of time to disperse the harmful gas, which results in a slow decrease in the harmful gas concentration and affects the processing efficiency of the harmful gas. In the present application, t1 and t2 are obtained in advance, the difference Δt between t1 and t2 is calculated, and the Δt can reflect the time for which the fan needs to be started in advance, i.e. the start compensation time t. In the implementation stage, when the start compensation time t is reached, the controller automatically starts the fan to ventilate and disperse the harmful gas, without waiting for the harmful gas concentration to reach a higher range, and the ventilation can be stopped until the harmful gas concentration is reduced to below the second concentration threshold value. The process advances the timing of the start of the fan, and does not need to wait for the harmful gas concentration to reach a higher range, so that the diffusion of the harmful gas can be controlled in advance, the harmful gas concentration is prevented from being too high, and the ventilation efficiency is improved.

[0024] In addition, the present application determines the start compensation time by multiple calculations and averaging in the test stage, which can more accurately predict the trend of the harmful gas concentration, start the ventilation in advance, avoid excessive accumulation of the harmful gas, and ensure the safety of the working environment.

[0025] In a preferred embodiment, in the intelligent ventilation control method, in step one, the underground tunnel is divided into three levels according to the temperature, the three levels include a low temperature level, a medium temperature level and a high temperature level, three first concentration threshold values and three second concentration threshold values are set for the three levels, and as the temperature of the three levels increases, the first concentration threshold value corresponding to each level gradually decreases, and the second concentration threshold value corresponding to each level gradually decreases; the corresponding temperature level and the corresponding first concentration threshold value and the second concentration threshold value of the test stage are determined according to the temperature of the underground tunnel, and a corresponding start compensation time t is calculated for each temperature level; in step two, the corresponding temperature level and the corresponding start compensation time t are determined according to the temperature of the underground tunnel.

[0026] For example, the first concentration threshold value is A1 and the second concentration threshold value is B1 in the low temperature level, the first concentration threshold value is A2 and the second concentration threshold value is B2 in the medium temperature level, and the first concentration threshold value is A3 and the second concentration threshold value is B3 in the high temperature level, wherein A1>A2>A3 and B1>B2>B3.

[0027] In the prior art, a fixed concentration threshold is used for ventilation control, which can easily lead to insufficient ventilation in high-temperature environments and fail to reduce the concentration of harmful gases to a safe level in time. In low-temperature environments, over-ventilation can occur, resulting in energy waste. Temperature has a significant impact on the diffusion rate and chemical reaction activity of harmful gases. In high-temperature environments, the diffusion speed of harmful gases is accelerated, and the chemical reaction is more active, which can exacerbate the harm to the human body. Therefore, the first concentration threshold and the second concentration threshold are the lowest in high-temperature environments. In low-temperature environments, the diffusion of harmful gases is relatively slow. Therefore, the first concentration threshold and the second concentration threshold are the highest in low-temperature environments.

[0028] In a preferred embodiment, in the intelligent ventilation control method, the low-temperature level is below 10℃; the medium-temperature level is between 10℃ and 25℃; and the high-temperature level is above 25℃.

[0029] In a preferred embodiment, in the intelligent ventilation control method, in step one, multiple test stages are designed for multiple working conditions, and a corresponding start-up compensation time t is calculated for each working condition, wherein each working condition corresponds to a diffusion mode of harmful gases; in step two, the working condition corresponding to the implementation stage is determined in advance, and the corresponding start-up compensation time t is selected according to the determined working condition.

[0030] Since underground tunnel construction involves multiple working conditions, such as excavation work, blasting work, support work, and auxiliary equipment installation work, the generation source, generation rate, and diffusion mode of harmful gases differ significantly under different working conditions. Traditional ventilation control methods often use a unified control strategy without fully considering the impact of different working conditions on the diffusion of harmful gases, resulting in poor ventilation effect. For example, after blasting work, harmful gases are generated instantaneously and diffuse rapidly. If the ventilation strategy for regular working conditions is still used for control, it can not be able to timely remove harmful gases, causing the concentration of harmful gases in the tunnel to be too high, threatening the safety of workers; in some low-intensity working conditions, using the same ventilation strategy can lead to energy waste. Therefore, the present application considers the impact of different working conditions on the diffusion of harmful gases, determines the corresponding start-up compensation time t for different working conditions, and adjusts the start-up time of the fan according to the start-up compensation time t of the corresponding working condition in the implementation stage to control the diffusion of harmful gases in advance.

[0031] In a preferred embodiment, in the intelligent ventilation control method, the multiple working conditions include excavation work, blasting work, support work, and underground tunnel auxiliary equipment installation work.

[0032] Excavation operation condition: During the excavation operation, harmful gas concentration data is collected at set time intervals. When the harmful gas concentration exceeds the first concentration threshold, the fan is started; when the concentration drops below the second concentration threshold, the fan is stopped. Record t1, t2 of each test, and calculate Δt. Repeat the test process at least 10 times (the number of times can be adjusted according to actual conditions).

[0033] Blasting operation condition: Blasting operation can instantaneously produce a large amount of harmful gas, and its diffusion mode is different from that of excavation operation. Prepare for the test before blasting operation, and start collecting harmful gas concentration data immediately after blasting. Similarly, control the start and stop of the fan according to the above process, record the relevant time data and calculate Δt, and repeat the test multiple times.

[0034] Support operation condition and auxiliary equipment installation operation condition: Similar test operations are carried out for these two conditions respectively. Since the harmful gas is relatively stable under these two conditions, the test process is similar to that of the excavation operation condition, but accurate time data still needs to be recorded according to actual conditions.

[0035] In a preferred embodiment, in the intelligent ventilation control method, in step one, the controller controls the fan to work at a set speed; in step two, in the starting stage of the start of the fan, the controller controls the fan to work at the set speed until the latest received harmful gas concentration data drops to 80% of the second concentration threshold, and then the controller continues to control the fan to work at 50% of the set speed.

[0036] In actual conditions, the required ventilation volume is different depending on the concentration of harmful gas. If only a fixed ventilation intensity is used, energy waste may occur when the harmful gas concentration is low, and the concentration cannot be effectively reduced in time when the harmful gas concentration is high. Therefore, in this embodiment, the speed of the fan is set according to the concentration of harmful gas in the implementation stage, which can not only ensure work efficiency and quickly reduce the concentration of harmful gas, but also achieve the purpose of saving resources.

[0037] In a preferred embodiment, in the intelligent ventilation control method, in step one, the second concentration threshold is 20-30% of the first concentration threshold.

[0038] In a preferred embodiment, in the intelligent ventilation control method, in step two, the time length T from the first received harmful gas concentration data to the latest received harmful gas concentration data reaches the start compensation time t, including that the time length T from the first received harmful gas concentration data to the latest received harmful gas concentration data is equal to or exceeds the start compensation time t.

[0039] The present application achieves the following technical effects:

[0040] (1) The influence of temperature on the diffusion and harm degree of harmful gas is considered, different concentration thresholds are set by dividing temperature grades, and the start and stop of the ventilation system can be more accurately controlled according to the actual environmental conditions, effectively avoiding the occurrence of insufficient ventilation or excessive ventilation.

[0041] (2) The diffusion mode of harmful gas under different working conditions is fully considered, the start compensation time is calculated for each working condition, and the precise control of the ventilation system is realized, which can timely and effectively exhaust harmful gas according to the actual working condition, and ensure the safety of the working environment.

[0042] (3) The method can adapt to various different working conditions in the construction process of underground tunnels, has good universality and adaptability, and can be widely applied to various underground tunnel projects.

[0043] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present application. Additional modifications can be easily realized by those skilled in the art. Therefore, the present application is not limited to specific details and examples shown and described herein without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A method of intelligent ventilation control, characterized by The ventilation system is used for supplying air to an underground tunnel, and comprises a harmful gas sensor arranged in the underground tunnel, a fan arranged in a ventilation duct, and a controller electrically connected with the harmful gas sensor and the fan respectively, one end of the ventilation duct being communicated with the underground tunnel and the other end being communicated with the outside; the method comprises: Step one, test phase, repeatedly execute the following test process: the harmful gas sensor collects harmful gas concentration data in the underground tunnel every set time interval, and sends each harmful gas concentration data to the controller, the controller compares each harmful gas concentration data with a preset first concentration threshold value, if the latest received harmful gas concentration data exceeds the first concentration threshold value, the controller controls the fan to start, supplies air to the underground tunnel through the ventilation duct, and the controller continuously receives harmful gas concentration data, when the latest received harmful gas concentration data of the controller drops below the second concentration threshold value, the controller controls the fan to stop, the controller calculates the time length t1 from the first received harmful gas concentration data to the first harmful gas concentration data exceeding the first concentration threshold value, and calculates the time length t2 from the start of the fan to the stop of the fan, and calculates the difference At between t1 and t2, wherein the first concentration threshold value is greater than the second concentration threshold value; after repeatedly executing the above test process, a plurality of At is calculated, and the average value of the plurality of At is taken as the start compensation time t; Step two, implementation phase: the harmful gas sensor collects harmful gas concentration data in the underground tunnel every set time interval, and sends each harmful gas concentration data to the controller, the controller calculates the time length T from the first received harmful gas concentration data to the latest received harmful gas concentration data, when the time length T reaches the start compensation time t, the controller controls the fan to start, supplies air to the underground tunnel through the ventilation duct, when the latest received harmful gas concentration data of the controller drops below the second concentration threshold value, the controller controls the fan to stop.

2. The intelligent ventilation control method of claim 1, wherein, In step one, three levels are divided according to the temperature in the underground tunnel, the three levels include low temperature level, medium temperature level and high temperature level, three first concentration threshold values and three second concentration threshold values are set for the three levels respectively, with the increase of the temperature of the three levels, the first concentration threshold value corresponding to each level gradually decreases, and the second concentration threshold value corresponding to each level gradually decreases; the corresponding temperature level, the corresponding first concentration threshold value and the corresponding second concentration threshold value of the test phase are determined according to the temperature of the underground tunnel, and a corresponding start compensation time t is calculated for each temperature level; in step two, the corresponding temperature level and the corresponding start compensation time t are determined according to the temperature of the underground tunnel.

3. The intelligent ventilation control method of claim 1, wherein, In the step one, multiple test stages are designed for multiple working conditions respectively, and a corresponding starting compensation time t is calculated for each working condition, wherein each working condition corresponds to a harmful gas diffusion mode; in the step two, the working condition corresponding to the implementation stage is determined in advance, and the corresponding starting compensation time t is selected according to the determined working condition.

4. The intelligent ventilation control method of claim 3, wherein, The multiple working conditions include excavation operation, blasting operation, supporting operation and underground tunnel auxiliary equipment installation operation.

5. The intelligent ventilation control method of claim 1, wherein, In the step one, the controller controls the fan to work at a set rotating speed; in the step two, the controller controls the starting stage of the fan, the controller controls the fan to work at the set rotating speed until a latest received harmful gas concentration data drops to 80% of the second concentration threshold, and then the controller continues to control the fan to work at 50% of the set rotating speed.

6. The intelligent ventilation control method of claim 1, wherein, In the step one, the second concentration threshold is 20-30% of the first concentration threshold.

7. The intelligent ventilation control method of claim 1, wherein, In the step two, the time length T between the first received harmful gas concentration data and the latest received harmful gas concentration data reaches the starting compensation time t, including that the time length T between the first received harmful gas concentration data and the latest received harmful gas concentration data is equal to or more than the starting compensation time t.

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