Extraction method for covering breathing plane domain of worker

Abstract

The invention relates to an extraction method for covering a worker breathing plane domain, which comprises the following steps that a movement residence time probability peak value grid of a worker in an operation process is counted, and a basic shape of a design plane domain is determined according to a shape defined by the movement residence time probability peak value grid of the worker, wherein a minimum ellipse envelope method is adopted; an envelope probability peak value grid is used as a boundary condition to determine a design surface domain covering breathing of a worker through a minimum elliptical envelope line method; the method for extracting the breathing zone design plane domain based on the worker residence time probability peak value is obtained by analyzing the shape features of the plane domain when the air supply jet flow body intersects with the breathing zone plane projection at different angles according to the principle that the jet flow boundary envelopes the person breathing plane domain. According to the extraction method, the air supply amount is saved while breathing exposure reduction of workers is achieved, and the station air supply design supplementing method is environmentally friendly, economical and convenient to master and implement for designers.

Description

technical field [0001] The invention belongs to the field of air supply design for workstations in industrial places, and relates to a minimum ellipse envelope method covering the breathing plane domain of workers. Background technique [0002] The local exhaust in many industrial places is limited by the process and cannot form a closed local exhaust hood, or a small amount of overflow from a high-pollution source is still extremely high for breathing. Most of them cannot rely solely on local exhaust to meet the healthy breathing needs of workers. For example, for the rubber product industry, even if the local exhaust air capture rate of the vulcanization process reaches more than 95%, the concentration of xylene dispersed in the working area is still 3mg / m 3 The "Rubber Factory Occupational Safety and Hygiene Design Standard" (GB / T 50643-2018) actually only stipulates that the concentration in the working area should not exceed 1mg / m 3 , The airflow protection effect crea...

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Problems solved by technology

[0003] However, the survey found that in a large number of actual industrial sites, workers will move within a single station or move between multiple stations.

When this range is small enough, the existing station air supply has good applicability; but when the moving distance is large (≥1m) (such as the moving distance of the rubber vulcanizer when operating the vulcanizer), the existing station The air supply airflow may fail to protect personnel against respiratory protection. The main reason is that the published air supply design method for the workstation only determines the coverage area of ​​the air supply airflow based on experience. It is a typical point-to-point air supply, which cannot envelop the workers. Actual movement of major areas during operation, resulting in less effective airflow protection for worker breathing

In actual industrial buildings, the personnel area corresponding to the workplace air supply is often vague. It is not only located in a specific area required by the production process and operation, but also the unavoidable movement of workers makes the space range larger and unclear, making In practice, the air supply at many workstations has basically no protective effect on the breathing zone of workers.

The existing air supply design methods for workstations lack corresponding technical means for how to use the effective envelope of airflow to cover the main areas where workers move, resulting in poor practical application effect

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