Method and device for measuring key parameters of VOC emission in in-vehicle non-metallic material

Abstract

The invention provides a method for measuring key parameters of VOC (Volatile Organic Compounds) emission in an in-vehicle non-metallic material, which is characterized by: deriving a balance emissionmodel of VOC in the non-metallic material at an environment cabin closed stage and a mass transfer diffusion model of the VOC in the non-metallic material at a direct current emission stage based ona mass transfer emission rule, a mass conservation law and a Henry's law, and measuring key parameters of an emission process of the in-vehicle non-metallic material in combination with actually measured data, wherein the key parameters comprise an initial emittable concentration C0, a distribution coefficient K, and a diffusion coefficient Dm. According to a device and the method for measuring the key parameters of the VOC emission in the in-vehicle non-metallic material, on the basis of a mass transfer diffusion rule and the mass conservation law of the VOC in the non-metallic material underdifferent conditions, the balance emission model of the VOC in the non-metallic material under the condition of closed environment cabin and the mass transfer diffusion model of the VOC in the non-metallic material under the condition of direct current emission are established, in combination with the actually measured data, the key parameters of the emission process of the in-vehicle non-metallic material are measured at the same time, wherein the key parameters comprise the initial emittable concentration C0, the diffusion coefficient Dm and the distribution coefficient K, thereby achieveing the goal of establishing a VOC prediction model of the in-vehicle non-metallic material.

Description

technical field [0001] The invention belongs to the field of VOC detection of volatile organic compounds, in particular to a method and a device for testing key parameters of VOC emission in non-metallic materials in vehicles. Background technique [0002] According to the definition of the World Health Organization (WHO), VOC (volatile organic compounds) are various organic compounds with a boiling point between 50°C and 260°C at room temperature. In my country, VOC refers to organic compounds with a saturated vapor pressure greater than 70Pa at normal temperature and a boiling point below 260°C at normal pressure, or all organic compounds with a vapor pressure greater than or equal to 10Pa at 20°C and are volatile. VOC widely exists in indoor and car air, seriously affecting the quality of indoor and car air quality. The most common types of indoor and in-vehicle VOCs include formaldehyde, acetaldehyde, benzene, toluene, ethylbenzene, xylene, styrene, and total volatile o...

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Problems solved by technology

Because the corresponding experimental system is directly measured according to the definition of each key parameter, the requirements for the experimental device are relatively high, and the detection time is relatively long (for example, when measuring the distribution coefficient of formaldehyde in carpets and wooden furniture according to the definition of the distribution coefficient, the detection time about 1 week to half a month), and the detection cost is relatively high, so this method is not conducive to the promotion in the industry

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