Intelligent ventilation control method

Abstract

The invention discloses an intelligent ventilation control method which comprises the following steps: a test stage: repeatedly executing the following test process for multiple times: collecting harmful gas concentration data in an underground tunnel through a harmful gas sensor, comparing each harmful gas concentration data with a first concentration threshold value by a controller, if the concentration data exceed the first concentration threshold value, controlling a fan to start, and if the concentration data exceed the first concentration threshold value, controlling a fan to start; when the latest received data is reduced to be below the second concentration threshold value, the fan is controlled to be closed, the time length t1 from the received first data to the first data exceeding the first concentration threshold value is calculated, the time length t2 from fan starting to fan closing is calculated, and the difference delta t between the t1 and the t2 is calculated; taking the average value of the plurality of delta t as starting compensation time t; in the implementation stage, the controller calculates the time duration T from the received first data to the latest received data, and when the time duration T reaches the starting compensation time t, the fan is controlled to be started. According to the invention, the content of harmful gas can be efficiently controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of underground building construction, and in particular to an intelligent ventilation control method. Background Art

[0002] During the construction of underground tunnels, the ventilation system plays a vital role. Since various harmful gases, such as carbon monoxide and hydrogen sulfide, are generated during the construction process, if they cannot be discharged in a timely and effective manner, they will pose a serious threat to the health of construction workers and may even cause safety accidents. Traditional ventilation control methods usually perform ventilation treatment when the concentration of harmful gases reaches a threshold, and it still takes a period of time to evacuate the harmful gases, resulting in the concentration of harmful gases not being able to drop quickly, affecting the efficiency of harmful gas treatment. Therefore, there is an urgent need for an intelligent ventilation control method that can be started in advance according to the diffusion of harmful gases, effectively control the diffusion of harmful gases, and improve ventilation efficiency. Summary of the invention

[0003] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages which will be described hereinafter.

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

[0005] In order to achieve these purposes and other advantages according to the present invention, an intelligent ventilation control method is provided, wherein the ventilation system is used to supply air to an underground tunnel, the ventilation system comprises a harmful gas sensor arranged in the underground tunnel, a fan arranged 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 comprises:

[0006] Step 1, test phase, repeat the following test process multiple times: collect a harmful gas concentration data in the underground tunnel at every set time interval through the harmful gas sensor, send each harmful gas concentration data to the controller, the controller compares each harmful gas concentration data with a preset first concentration threshold, if the latest received harmful gas concentration data exceeds the first concentration threshold, the controller controls the fan to start, and supplies air to the underground tunnel through the ventilation duct, and the controller continues to receive harmful gas concentration data, when the latest 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 from the first harmful gas concentration data received to the first harmful gas concentration data exceeding the first concentration threshold, and calculates the time length t2 from the start of the fan to the shutdown of the fan, and 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 multiple times, multiple Δt are calculated, and the average value of the multiple Δt is used as the start compensation time t;

[0007] Step 2, implementation stage: collect a harmful gas concentration data in the underground tunnel at every time interval through the harmful gas sensor, and send each harmful gas concentration data to the controller. When the controller calculates the time length T between the first harmful gas concentration data received to the latest harmful gas concentration data received and reaches the start-up compensation time t, the controller controls the fan to start and supply air to the underground tunnel through the ventilation duct. When the latest harmful gas concentration data received by the controller drops below the second concentration threshold, the controller controls the fan to shut down.

[0008] Preferably, in the intelligent ventilation control method, in the step one, the temperature in the underground tunnel is divided into three levels, the three levels including a low temperature level, a medium temperature level and a high temperature level, and three first concentration thresholds and three second concentration thresholds are set for the three levels respectively. As the temperatures of the three levels increase, the first concentration threshold corresponding to each level gradually decreases, and the second concentration threshold corresponding to each level gradually decreases; the corresponding temperature level of the test stage and the corresponding first concentration threshold and the second concentration threshold are determined according to the temperature of the underground tunnel, and a corresponding start-up compensation time t is calculated for each temperature level; in the step two, the corresponding temperature level and the corresponding start-up compensation time t are determined according to the temperature of the underground tunnel.

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

[0010] Preferably, in the intelligent ventilation control method, in the step one, multiple test phases 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 harmful gas diffusion mode; in the step two, the working conditions corresponding to the implementation phase are determined in advance, and the corresponding start-up compensation time t is selected according to the determined working conditions.

[0011] Preferably, in the intelligent ventilation control method, the multiple working conditions include excavation operations, blasting operations, support operations and underground tunnel ancillary equipment installation operations.

[0012] Preferably, in the intelligent ventilation control method, in the step one, the controller controls the fan to operate at a set speed; in the step two, the controller controls the initial stage of the fan startup, and the controller controls the fan to operate at the set speed until the most recently received harmful gas concentration data drops to 80% of the second concentration threshold, after which the controller continues to control the fan to operate at 50% of the set speed.

[0013] Preferably, in the intelligent ventilation control method, in the step 1, the second concentration threshold is 20-30% of the first concentration threshold.

[0014] Preferably, in the intelligent ventilation control method, in the step 2, the time length T from the first harmful gas concentration data received to the latest harmful gas concentration data received reaches the start compensation time t, including the time length T from the first harmful gas concentration data received to the latest harmful gas concentration data received is equal to or exceeds the start compensation time t.

[0015] The present invention has at least the following beneficial effects:

[0016] The present invention provides an intelligent ventilation control method, wherein the ventilation system is used to supply air to an underground tunnel, the ventilation system comprises a harmful gas sensor arranged in the underground tunnel, a fan arranged 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 comprises: step one, a test phase, repeatedly performing the following test process multiple times: collecting a harmful gas concentration data in the underground tunnel at every set time interval through the harmful gas sensor, sending each harmful gas concentration data to the controller, the controller comparing each harmful gas concentration data with a preset first concentration threshold value, if the most recently received 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 the harmful gas concentration data, when the most recently received harmful gas concentration data drops below the second concentration threshold value, the controller controls the The fan is turned off, the controller calculates the time length t1 from the first harmful gas concentration data received to the first harmful gas concentration data exceeding the first concentration threshold, and calculates the time length t2 from the fan start to the fan shutdown, and 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 multiple times, multiple Δt are calculated, and the average value of the multiple Δt is used as the startup compensation time t; Step 2, implementation stage: the harmful gas sensor collects a harmful gas concentration data in the underground tunnel at each time interval, and sends each harmful gas concentration data to the controller, the controller calculates the time length T from the first harmful gas concentration data received to the latest received harmful gas concentration data. When it reaches the startup compensation time t, the controller controls the fan to start and supply air to the underground tunnel through the ventilation duct. When the harmful gas concentration data latest received by the controller drops below the second concentration threshold, the controller controls the fan to turn off. The present invention can calculate a start-up compensation time according to the diffusion of harmful gases, and start the fan in advance according to the start-up compensation time during the implementation stage, thereby controlling the diffusion of harmful gases in advance, avoiding excessive concentration of harmful gases, and improving ventilation efficiency.

[0017] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a flow chart of the intelligent ventilation control method provided by the present invention. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0020] like Figure 1 As shown, the present 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 arranged in the underground tunnel, a fan arranged 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, test phase, repeat the following test process multiple times: collect a harmful gas concentration data in the underground tunnel at set time intervals through the harmful gas sensor, send each harmful gas concentration data to the controller, the controller compares each harmful gas concentration data with a preset first concentration threshold, if the latest received harmful gas concentration data exceeds the first concentration threshold, the controller controls the fan to start, and supplies air to the underground tunnel through the ventilation duct, and the controller continues to receive harmful gas concentration data, when the latest 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 from the first harmful gas concentration data received to the first harmful gas concentration data exceeding the first concentration threshold, and calculates the time length t2 from the fan start to the fan shutdown, and 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 multiple times, multiple Δt are calculated, and the average value of the multiple Δt is used as the start compensation time t.

[0022] Step 2, implementation stage: collect a harmful gas concentration data in the underground tunnel at every time interval through the harmful gas sensor, and send each harmful gas concentration data to the controller. When the controller calculates the time length T between the first harmful gas concentration data received to the latest harmful gas concentration data received and reaches the start-up compensation time t, the controller controls the fan to start and supply air to the underground tunnel through the ventilation duct. When the latest harmful gas concentration data received by the controller drops below the second concentration threshold, the controller controls the fan to shut down.

[0023] In the present invention, in the test phase, the time length t1 between the first harmful gas concentration data received by the controller and the first harmful gas concentration data exceeding the first concentration threshold reflects the diffusion of harmful gases, and the time length t2 from the start of the fan to the shutdown of the fan reflects the time required for the fan to evacuate the harmful gases. In the existing methods, the ventilation control method usually performs ventilation processing when the concentration of harmful gases reaches the threshold, and it still takes a period of time to evacuate the harmful gases, resulting in the concentration of harmful gases not being able to drop quickly, affecting the efficiency of harmful gas treatment. In the present invention, t1 and t2 are obtained in advance, and the difference Δt between t1 and t2 is calculated. The Δt can reflect the time when the fan needs to be started in advance, that is, the start compensation time t. In the implementation phase, when the start compensation time t is reached, the controller automatically starts the fan for ventilation to evacuate the harmful gases without waiting for the concentration of harmful gases to reach a higher range, until the concentration of harmful gases drops below the second concentration threshold, then the ventilation can be stopped. This process advances the timing of fan startup and there is no need to wait for the concentration of harmful gases to reach a higher range. Therefore, the diffusion of harmful gases can be controlled in advance, avoiding excessive concentration of harmful gases and improving ventilation efficiency.

[0024] In addition, the present invention determines the start-up compensation time by taking the average value through multiple calculations in the test phase, which can more accurately predict the trend of changes in harmful gas concentrations, start ventilation in advance, avoid excessive accumulation of harmful gases, and ensure a safe working environment.

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

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

[0027] In the existing methods, a fixed concentration threshold is used for ventilation control, which may easily lead to insufficient ventilation in a high temperature environment and fail to reduce the concentration of harmful gases to a safe level in time; in a low temperature environment, excessive ventilation may occur, resulting in energy waste. Temperature has a significant impact on the diffusion rate and chemical reaction activity of harmful gases. In a high temperature environment, the diffusion rate of harmful gases is accelerated, the chemical reactions are more active, and their harm to the human body may be aggravated. Therefore, the first concentration threshold and the second concentration threshold are the lowest in a high temperature environment. In a low temperature environment, the diffusion of harmful gases is relatively slow. Therefore, the first concentration threshold and the second concentration threshold are the highest in a low temperature environment.

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

[0029] In a preferred embodiment, in the intelligent ventilation control method, in the step one, multiple test phases 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 harmful gas diffusion mode; in the step two, the working condition corresponding to the implementation phase 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 a variety of working conditions, such as excavation, blasting, support and auxiliary equipment installation, there are significant differences in the source, generation rate and diffusion mode of harmful gases under different working conditions. Traditional ventilation control methods often adopt a unified control strategy, which does not fully consider the impact of different working conditions on the diffusion of harmful gases, resulting in poor ventilation effect. For example, after the blasting operation, harmful gases are instantly produced in large quantities and diffuse rapidly. If they are still controlled according to the ventilation strategy of conventional working conditions, the harmful gases may not be discharged in time, resulting in excessive concentration of harmful gases in the cave, threatening the life safety of the operators; and under some low-intensity working conditions, the use of the same ventilation strategy may lead to energy waste. Therefore, the present invention takes into account 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 timing 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 operations, blasting operations, support operations, and underground tunnel ancillary equipment installation operations.

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

[0033] Blasting operation: Blasting operation will instantly generate a large amount of harmful gases, and its diffusion pattern is different from that of excavation operation. Prepare the test before the blasting operation, and start collecting harmful gas concentration data immediately after the blasting. Also 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 conditions and auxiliary equipment installation operation conditions: Similar test operations are carried out for these two conditions respectively. Since the generation of harmful gases is relatively stable under these two conditions, the test process is similar to the excavation operation condition, but accurate time data still needs to be recorded according to the actual situation.

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

[0036] In actual situations, the required ventilation volume varies with the concentration of harmful gases. If only a fixed ventilation intensity is used, energy may be wasted when the concentration of harmful gases is low, and the concentration cannot be reduced in time and effectively when the concentration of harmful gases is high. Therefore, this embodiment sets the fan speed according to the concentration of harmful gases in the implementation stage, which can ensure work efficiency, reduce the concentration of harmful gases as soon as possible, and achieve the purpose of saving resources.

[0037] In a preferred embodiment, in the intelligent ventilation control method, in the step 1, the second concentration threshold is 20-30% of the first concentration threshold.

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

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

[0040] (1) The effect of temperature on the diffusion and degree of harmful gases is taken into account. By dividing the temperature levels and setting different concentration thresholds, the start and stop of the ventilation system can be controlled more accurately according to the actual environmental conditions, effectively avoiding insufficient or excessive ventilation.

[0041] (2) The diffusion pattern of harmful gases under different working conditions is fully considered. By calculating the start-up compensation time separately for each working condition, precise control of the ventilation system is achieved. Harmful gases can be discharged in a timely and effective manner according to the actual working conditions to ensure the safety of the working environment.

[0042] (3) This method can adapt to various working conditions during underground tunnel construction, has good versatility and adaptability, and can be widely used in various underground tunnel projects.

[0043] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. An intelligent ventilation control method, characterized in that: The ventilation system is used to supply air to the underground tunnel, and 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 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: Step 1, test phase, repeat the following test process multiple times: collect a harmful gas concentration data in the underground tunnel at every set time interval through the harmful gas sensor, send each harmful gas concentration data to the controller, the controller compares each harmful gas concentration data with a preset first concentration threshold, if the latest received harmful gas concentration data exceeds the first concentration threshold, the controller controls the fan to start, and supplies air to the underground tunnel through the ventilation duct, and the controller continues to receive harmful gas concentration data, when the latest 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 from the first harmful gas concentration data received to the first harmful gas concentration data exceeding the first concentration threshold, and calculates the time length t2 from the start of the fan to the shutdown of the fan, and 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 multiple times, multiple Δt are calculated, and the average value of the multiple Δt is used as the start compensation time t; Step 2, implementation stage: collect a harmful gas concentration data in the underground tunnel at every time interval through the harmful gas sensor, and send each harmful gas concentration data to the controller. When the controller calculates the time length T between the first harmful gas concentration data received to the latest harmful gas concentration data received and reaches the start-up compensation time t, the controller controls the fan to start and supply air to the underground tunnel through the ventilation duct. When the latest harmful gas concentration data received by the controller drops below the second concentration threshold, the controller controls the fan to shut down.

2. The intelligent ventilation control method according to claim 1, characterized in that: In the step one, the temperature in the underground tunnel is divided into three levels, the three levels including a low temperature level, a medium temperature level and a high temperature level. Three first concentration thresholds and three second concentration thresholds are set for the three levels respectively. As the temperatures of the three levels increase, the first concentration threshold corresponding to each level gradually decreases, and the second concentration threshold corresponding to each level gradually decreases. The corresponding temperature level and the corresponding first concentration threshold and the second concentration threshold of the test stage are determined according to the temperature of the underground tunnel, and a corresponding start-up compensation time t is calculated for each temperature level. In the step two, the corresponding temperature level and the corresponding start-up compensation time t are determined according to the temperature of the underground tunnel.

3. The intelligent ventilation control method according to claim 2, characterized in that: The low temperature level is below 10°C; the medium temperature level is between 10°C and 25°C; and the high temperature level is above 25°C.

4. The intelligent ventilation control method according to claim 1, characterized in that: In the step one, multiple test phases 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 harmful gas diffusion mode; in the step two, the working conditions corresponding to the implementation phase are determined in advance, and the corresponding start-up compensation time t is selected according to the determined working conditions.

5. The intelligent ventilation control method according to claim 4, characterized in that: The various working conditions include excavation operations, blasting operations, support operations, and installation operations of underground tunnel ancillary equipment.

6. The intelligent ventilation control method according to claim 1, characterized in that: In the step one, the controller controls the fan to operate at a set speed; in the step two, the controller controls the initial stage of the fan startup, and the controller controls the fan to operate at the set speed until the most recently received harmful gas concentration data drops to 80% of the second concentration threshold, after which the controller continues to control the fan to operate at 50% of the set speed.

7. The intelligent ventilation control method according to claim 1, characterized in that: In the step 1, the second concentration threshold is 20-30% of the first concentration threshold.

8. The intelligent ventilation control method according to claim 1, characterized in that: In the step 2, the time length T between the first harmful gas concentration data received and the latest harmful gas concentration data received reaches the start-up compensation time t, including the time length T between the first harmful gas concentration data received and the latest harmful gas concentration data received is equal to or exceeds the start-up compensation time t.

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