Airflow distribution measurement and evaluation method
By setting up measuring points in the workplace and drawing a three-dimensional system diagram of airflow organization, combined with ventilation system parameters and safety logic assessment, the problem of inaccurate airflow organization detection in existing technologies has been solved, achieving accurate measurement and assessment of airflow organization, and improving the safety of ventilation systems and their ability to capture harmful substances.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-01
- Publication Date
- 2026-04-10
AI Technical Summary
Existing technologies for detecting workplace airflow organization lack dynamic correlation and logical comparison of airflow direction, location of hazardous material escaping points, and worker operating positions, leading to inaccurate measurement results and potential ventilation safety hazards.
Multiple measuring points are set up in the workplace to measure airflow direction and wind speed, and a three-dimensional system diagram of airflow organization is drawn. The system is evaluated in combination with ventilation system parameters and safety logic to calculate the actual number of air changes. The grid-based measurement method and smoke simulation are used to ensure the accuracy and comprehensiveness of the measurement.
It enables precise measurement and assessment of workplace airflow organization, improves the safety of ventilation systems and their ability to capture hazardous substances, and ensures worker safety.
Smart Images
Figure CN121829642A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of workplace ventilation detection technology, and in particular to a method for measuring and evaluating airflow organization. Background Technology
[0002] In workplaces, especially industrial workplaces involving hazardous substances (such as chemical pollutants and radioactive aerosols), airflow organization is crucial. Proper airflow organization is a key factor in ensuring occupational health and safety, controlling the spread of pollutants, and meeting the environmental temperature, humidity, and cleanliness requirements of production processes. An ideal airflow organization should ensure that fresh air preferentially flows through the worker's breathing zone, then passes the source of hazardous substance escaping, and is ultimately effectively captured by the exhaust system and discharged outdoors, thereby minimizing the risk of worker exposure to hazardous substances. In accident situations, proper airflow organization further ensures that the emergency ventilation system can quickly remove leaked hazardous substances, preventing their accumulation and spread.
[0003] Currently, when conducting airflow organization tests in workplaces, the tests often only focus on a single parameter, such as the number of air changes or the flow rate at the supply and exhaust vents, according to national or industry standards, to determine whether the requirements of the standards are met.
[0004] However, this measurement method only measures and evaluates whether the performance and frequency of exhaust are up to standard, ignoring the measurement and evaluation of the overall airflow path, direction and three-dimensional structure within the entire workplace. It lacks the means to dynamically correlate and logically compare the airflow direction, the location of hazardous material escaping points and the workers' operating positions, resulting in measurement results that cannot accurately measure and evaluate the airflow organization in the workplace, leading to ventilation safety hazards in the workplace. Summary of the Invention
[0005] To address the shortcomings of existing technologies, the purpose of this application is to provide a method for measuring and evaluating airflow organization, which can systematically and accurately assess the airflow organization in the workplace and ensure workplace ventilation safety.
[0006] To achieve the above objectives, this application provides, including: Based on the spatial dimensions of the workplace, the critical equipment area, and the construction personnel area, multiple measuring points are set up on at least one horizontal plane in the workplace, and the airflow direction and wind speed after the ventilation system is turned on are measured and determined at the measuring points. Based on the airflow direction and wind speed determined by measurements at each measuring point, a three-dimensional system diagram of airflow organization in the workplace is drawn. The airflow organization is evaluated based on the three-dimensional system diagram of the airflow organization, the ventilation system parameters of the workplace, and the preset safety logic.
[0007] Further, the ventilation system parameters include the ventilation method and its expected air flow direction.
[0008] Further, it also includes: calculating the actual air change rate of the ventilation system by measuring the time from when the smoke filling the workplace starts to be exhausted completely after the ventilation system is turned on.
[0009] Further, the measurement horizontal planes include a first horizontal plane and a second horizontal plane. The first horizontal plane is the breathing zone plane of workers at a height of 1.5 meters from the ground or platform. The height of the second horizontal plane is determined according to the density of harmful substances in the workplace. When the density of harmful substances is greater than that of air, the height of the second horizontal plane is 0.3 - 1 meter from the ground or platform; when the density of harmful substances is less than that of air, the height of the second horizontal plane is 2 meters from the ground or platform.
[0010] Further, the measuring points are arranged using the grid layout method, and the grid size is determined according to the long-axis dimension L of the workplace: When L ≤ 10 meters, the grid size is 1 meter × 1 meter; When 10 meters < L ≤ 20 meters, the grid size is 2 meters × 2 meters; when L > 20 meters, the grid size is 3 meters × 3 meters.
[0011] Further, use a smoke generator to generate smoke at the measuring points to determine the air flow direction.
[0012] Further, after determining the air flow direction, use a wind speed meter to measure the wind speed in the air flow direction. Each measuring point is measured multiple times and the average value is taken as the wind speed value of the measuring point.
[0013] Further, the specific steps for evaluating the air flow organization based on the three-dimensional air flow organization system diagram and the preset safety logic include: Compare the ventilation method and its expected air flow direction in the ventilation system parameters with the measured air flow direction of each measuring point. If the measured direction of the measuring point does not conform to the ventilation method and its expected air flow direction, it is determined that the air flow organization at this point is unreasonable.
[0014] Further, the specific steps for evaluating the air flow organization based on the three-dimensional air flow organization system diagram and the preset safety logic also include: Compare the actual air change rate with the predetermined air change rate. If it is less than the predetermined air change rate, it is evaluated that the air change rate does not meet the requirements.
[0015] Further, the specific steps for evaluating the air flow organization based on the three-dimensional air flow organization system diagram and the preset safety logic also include: Based on the horizontal wind direction in the three-dimensional air flow organization system diagram, determine whether the harmful substance dispersion source is located downwind of the worker's operation position. If not, it is determined that the air flow path in this area is unsafe.
[0016] The method for measuring and evaluating airflow organization in this application transforms the fuzzy concept of airflow organization in the workplace into a series of measurable, recordable, and reproducible objective data through standardized grid layout, precise multiple wind speed measurements, and airflow direction determination, providing a solid data foundation for accurate evaluation of airflow organization.
[0017] The airflow organization measurement and assessment method of this application can be designed specifically for risk and wind speed detection based on hazardous substances and workplace structure. The measurement method is adaptable to industrial scenarios with different hazardous substances, which significantly improves the capture capability and assessment accuracy of specific risks (such as the accumulation of heavy steam at low levels).
[0018] The method for measuring and evaluating airflow organization in this application, based on the measurement results, comprehensively considers the workplace ventilation system and personnel construction positions, and evaluates the gas organization from multiple perspectives, thereby achieving a global and three-dimensional evaluation of gas flow.
[0019] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing this application. Attached Figure Description
[0020] The accompanying drawings are provided to further illustrate the present application and form part of the specification. Together with the embodiments of the present application, they serve to explain the present application but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the pyrolysis vaporization furnace in Embodiment 1 of this application; Figure 2 This is a schematic diagram of the layout of the measuring points; Figure 3 A schematic diagram of the measurement results at each measuring point; Figure 4 This is a three-dimensional system diagram of an example airflow organization. Detailed Implementation
[0021] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.
[0022] It should be understood that the steps described in the method embodiments of this application may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of this application is not limited in this respect.
[0023] The term "comprising" and its variations as used herein are open-ended inclusions, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the description below.
[0024] It should be noted that the terms "one" and "multiple" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless explicitly stated otherwise in the context, they should be interpreted as "one or more". "Multiple" should be understood as two or more.
[0025] The embodiments of this application will now be described in detail with reference to the accompanying drawings.
[0026] Example 1 One embodiment of this application provides a method for measuring and evaluating airflow organization, which will be referred to below. Figure 1-4 The method for measuring and evaluating airflow organization in this application is described as follows: Step S101: Based on the spatial dimensions of the workplace, the critical equipment area, and the construction personnel area, set up multiple measuring points on at least one horizontal plane within the workplace, and measure and determine the airflow direction and wind speed after the ventilation system is turned on at the measuring points; Before the formal measurement, the spatial dimensions of the workplace will be determined based on the design drawings of the workplace, the design drawings of the ventilation system, the equipment and construction layout drawings, the ventilation method and the number of air changes of the ventilation system, such as: top air supply and bottom exhaust, bottom air supply and top exhaust, top air supply and top exhaust, bottom air supply and bottom exhaust, etc. After determining the spatial dimensions, measurement points are arranged according to the key equipment areas and construction personnel areas in the construction layout drawings, as well as the properties of potential hazardous substances in the workplace. The measurement points are placed on a first horizontal plane and a second horizontal plane. The first horizontal plane is the worker's breathing zone plane, 1.5 meters above the ground or platform. The height of the second horizontal plane is determined based on the density of hazardous substances in the workplace. When the density of hazardous substances is greater than that of air, the height of the second horizontal plane is 0.3-1 meter above the ground or platform; when the density of hazardous substances is less than that of air, the height of the second horizontal plane is 2 meters above the ground or platform. The measurement points are laid out using a grid method, and the grid size is determined based on the major axis dimension L of the workplace. When L ≤ 10 m, the grid size is 1 m × 1 m; When 10 m < L ≤ 20 m, the grid size is 2 m × 2 m; when L > 20 m, the grid size is 3 m × 3 m.
[0027] Exemplarily, as Figure 2 shown, Figure 2 is a layout schematic diagram of the measuring points. As shown in the figure, there are nine measuring points arranged in a grid.
[0028] In some other embodiments, multiple measurement horizontal planes can be correspondingly set according to the structural configuration of the plant building. For example, in a multi-layer structure, multiple measurement horizontal planes are correspondingly set.
[0029] During measurement, first, the wind speed and wind direction are detected and determined. When measuring, the ventilation system is turned on, and a handheld smoke generator is placed at the measuring point position on the measurement plane, and smoke is emitted. Observe the flow direction of the smoke and record the air flow direction of the measuring point. The air flow directions include: vertically upward, upward eastward, upward westward, upward northward, upward southward, upward northeastward, upward northwestward, upward southeastward, upward southwestward, vertically downward, downward eastward, downward westward, downward northward, downward southward, downward northeastward, downward northwestward, downward southeastward, downward southwestward, horizontal eastward, horizontal northward, horizontal westward, horizontal southward, horizontal southeastward, horizontal southwestward, horizontal northeastward, horizontal northwestward, no wind, etc.
[0030] According to the determined wind direction, a wind speed meter is used to measure the wind speed on-site. When measuring, the rod head of the wind speed meter is pulled out and placed at the measuring point position on the measurement plane. The indicating point on the probe head is aligned with the marked direction for measurement, and the reading is taken. Each measuring point is measured 3 times, and the average value is taken as the wind speed of the measuring point.
[0031] It can be understood that during measurement, the ventilation system should operate stably, there should be no personnel walking back and forth on-site, the measurement personnel should be at least 0.5 m away from the measuring point, and stand on the side of the air flow to avoid the influence of human factors on the measurement results.
[0032] Exemplarily, Figure 3 is a schematic diagram of the measurement results of each measuring point. As Figure 3 shown, the measurement results include the wind direction, the wind speed detection results each time, and the average value.
[0033] In this embodiment, a smoke generation simulation measurement is also performed to determine the time it takes for smoke to be completely expelled from the workplace from the moment the ventilation system is turned on, and then to calculate the actual number of air changes of the ventilation system. During the smoke generation simulation measurement, the ventilation system in the workplace is first turned off, the doors and windows are closed, and a large smoke generator is used to release smoke into the workplace until the smoke fills the entire workplace. Then the ventilation system is turned on, and video recording is started simultaneously to record the duration when no smoke is visible in the workplace, i.e., the time ΔT required for the smoke to be completely expelled from the workplace. The video recording is turned off after 2 minutes.
[0034] Calculate the actual air exchange rate x of the ventilation system based on the smoke dissipation time. The formula is: x = 60 / ΔT.
[0035] In this embodiment, the smoke conditions in the wind-blocked areas of the workplace are also recorded, and the wind speed in the wind-blocked areas is measured. During the measurement, the probe indicator point is rotated, and the maximum wind speed and wind direction are recorded.
[0036] Step S102: Based on the airflow direction and wind speed determined at each measuring point, draw a three-dimensional system diagram of the airflow organization in the workplace; like Figure 4 As shown, Figure 4 This is a three-dimensional system diagram of airflow organization as an example, with each measuring point and its wind direction marked.
[0037] Step S103: Evaluate the airflow organization based on the three-dimensional system diagram of the airflow organization, the ventilation system parameters of the workplace, and the preset safety logic; In this embodiment, the airflow direction at each measuring point is first determined to match the exhaust method of the ventilation system based on the three-dimensional system diagram of airflow organization and ventilation system parameters. For example, if the ventilation system of the workplace is a bottom supply and top exhaust method, all measurement results should be upward. If there is no wind (wind speed < 0.1m / s), horizontal or downward, then the airflow organization at that point is not in compliance.
[0038] Then, based on the wind direction at each measuring point, it will be assessed whether the location of the hazardous material is downwind of the worker's operating position. If so, it is considered compliant; otherwise, it is considered non-compliant.
[0039] Finally, the air exchange rate is evaluated by comparing the actual air exchange rate x in the workplace with the predetermined air exchange rate of 6 times. If the actual air exchange rate x ≥ 6 times / h, it is considered to meet the requirement; if it is less than 6 times, it is considered to not meet the requirement.
[0040] It should be noted that the predetermined number of air changes can be adjusted according to the type of hazardous substances and actual ventilation requirements.
[0041] The above description is merely a partial embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.
[0042] Furthermore, while the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in sequential order. Multitasking and parallel processing may be advantageous in certain environments. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this application. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.
[0043] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.
Claims
1. A method of measurement and evaluation of air flow organization, characterized in that, The method comprises: Based on the size of the workplace, the key equipment area and the construction personnel area, a plurality of measuring points are arranged on at least one measuring horizontal plane in the workplace, and the airflow direction and wind speed after the ventilation system is opened are measured and determined at the measuring points; Based on the airflow organization three-dimensional system diagram, the ventilation system parameters of the workplace and the preset safety logic, the airflow organization is evaluated. The ventilation system parameters include the ventilation mode and the expected airflow direction.
2. The method of airflow organization measurement and evaluation according to claim 1, characterized in that, The method further comprises:
3. The method of airflow organization measurement and evaluation according to claim 2, characterized in that, The actual air exchange frequency of the ventilation system is calculated by measuring the time from when the ventilation system is opened to when the smoke filling the workplace is completely exhausted. The measuring horizontal plane comprises a first horizontal plane and a second horizontal plane, the first horizontal plane is a worker breathing zone plane at a height of 1.5 meters from the ground or platform, and the height of the second horizontal plane is determined according to the density of the harmful substance in the workplace; when the density of the harmful substance is greater than that of air, the height of the second horizontal plane is 0.3-1 meters from the ground or platform; when the density of the harmful substance is less than that of air, the height of the second horizontal plane is 2 meters from the ground or platform.
4. The method of airflow organization measurement and evaluation according to claim 1, characterized in that, The measuring points are arranged using a grid point arrangement method, and the grid size is determined according to the length L of the long axis of the workplace:
5. The method of airflow organization measurement and evaluation according to claim 1, characterized in that, When L ≤ 10 meters, the grid size is 1 meter x 1 meter; When 10 meters < L ≤ 20 meters, the grid size is 2 meters x 2 meters; When L > 20 meters, the grid size is 3 meters x 3 meters. A smoke generator is used to generate smoke at the measuring points to determine the airflow direction.
6. The method of airflow organization measurement and evaluation according to claim 1, characterized in that, After the airflow direction is determined, a wind speed meter is used to measure the wind speed in the airflow direction, and the average value of multiple measurements at each measuring point is taken as the wind speed value of the measuring point.
7. The method of airflow organization measurement and evaluation according to claim 1, characterized in that, The specific steps for evaluating the airflow organization based on the airflow organization three-dimensional system diagram and the preset safety logic comprise:
8. The method of airflow organization measurement and evaluation according to claim 1, characterized in that, The ventilation mode and the expected airflow direction in the ventilation system parameters are compared with the measured airflow direction of each measuring point, and if the measured direction of the measuring point does not conform to the ventilation mode and the expected airflow direction, it is determined that the airflow organization at the point is unreasonable. The specific steps for evaluating the airflow organization based on the airflow organization three-dimensional system diagram and the preset safety logic further comprise:
9. The method of airflow organization measurement and evaluation according to claim 3, characterized in that, The actual air exchange frequency is compared with the predetermined air exchange frequency, and if it is less than the predetermined air exchange frequency, it is evaluated as not conforming to the air exchange frequency. The specific steps for evaluating the airflow organization based on the airflow organization three-dimensional system diagram and the preset safety logic further comprise:
10. The method of airflow organization measurement and evaluation according to claim 8, characterized in that, Based on the horizontal wind direction in the airflow organization three-dimensional system diagram, it is determined whether the harmful substance escape source is located downwind of the worker operating position, and if not, it is determined that the airflow path in the region is unsafe.