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  • 实验室通风柜在实验室中作用!
    来源:http://www.jnyhrs.com 浏览: 发布日期:2021-11-09
    通风柜的主要功能是排气功能。在化学实验室,实验操作过程中会产生各种有害气体、气味、水分和易燃、易爆、腐蚀性物质。为了保护使用者的安全,防止实验中的污染物扩散到实验室,应在污染源附近使用通风柜。如果通风柜数量少,只用于有特别有害和危险气体并产生大量热量的实验。那么,通风柜只负责试验台的辅助功能。
    The main function of the fume hood is exhaust. In the chemical laboratory, various harmful gases, odors, moisture and flammable, explosive and corrosive substances will be produced during the experimental operation. In order to protect the safety of users and prevent the pollutants in the experiment from spreading to the laboratory, a fume hood should be used near the pollution source. If the number of fume hoods is small, it is only used for experiments with particularly harmful and dangerous gases and generating a large amount of heat. Then, the fume hood is only responsible for the auxiliary functions of the test bench.
    为了改善实验环境,在实验台上进行的实验逐渐转移到通风柜,这就要求通风柜要有更适合设备的功能。特别是新建的实验室大多需要空调,所以在建筑的初步设计阶段,应将通风柜的数量纳入空调系统规划。由于通风柜在生化实验室中占有非常重要的地位,因此在改善实验室环境、劳动卫生条件和工作效率方面,通风柜的数量急剧增加。与此同时,通风管道、管道、配线和排气已成为实验室建设的。
    In order to improve the experimental environment, the experiments carried out on the experimental platform are gradually transferred to the fume hood, which requires the fume hood to have the function most suitable for the equipment. In particular, most new laboratories need air conditioning, so the number of fume hoods should be included in the air conditioning system planning in the preliminary design stage of the building. Because the fume hood plays a very important role in the biochemical laboratory, the number of fume hoods has increased sharply in improving the laboratory environment, labor health conditions and work efficiency. At the same time, ventilation pipes, pipes, wiring and exhaust have become the focus of laboratory construction.
    使用通风柜的目的是排出实验中产生的有害气体,保护实验研究人员的健康,也就是说我们要有一个高度的安全性和优越的操作性,这就需要要求通风柜应具有风速控制功能。
    The biggest purpose of using the fume hood is to discharge the harmful gas generated in the experiment and protect the health of experimental researchers, that is, we should have a high degree of safety and superior operability, which requires that the fume hood should have the function of wind speed control.
    为了防止有害气体从通风罩中逸出,需要一定的吸风速度。决定通风柜进气速度的因素是实验内容产生的热量以及与通风次数的关系。主要是实验内容和有害物质的性质。按照国家标准,通风柜表面风速为0.5米/s±10%。为了保证这种风速,排气扇应具有必要的静态压力,即空气通过通风管道时的摩擦阻力。
    In order to prevent harmful gases from escaping from the ventilation hood, a certain suction speed is required. The factors that determine the air inlet speed of the fume hood are the heat generated by the experimental content and the relationship with the ventilation times. Mainly the experimental content and the properties of harmful substances. According to national standards, the wind speed on the surface of the fume hood is 0.5m/s ± 10%. In order to ensure this wind speed, the exhaust fan shall have the necessary static pressure, that is, the friction resistance when the air passes through the ventilation duct.
    无菌室装修
    在确定风速时还必须注意噪声,通过管道中的气流限制在7-10米以内,超过10米就会产生噪声,通常实验室(室内背景噪声等级)的噪声限制为70dBA,增加管道面积会降低风速,对热量和酸碱的耐腐蚀性。
    When determining the wind speed, attention must also be paid to noise. The air flow through the pipeline is limited to 7-10m, and noise will be generated if it exceeds 10m. Generally, the noise in the laboratory (indoor background noise level) is limited to 70dba. Increasing the pipeline area will reduce the wind speed and the corrosion resistance to heat and acid-base.
    有些通风柜应放在电炉中,有些实验会产生大量的酸和碱以及其他腐蚀性强的有毒有害气体。通风柜柜台、衬里、侧板及选定的水、气等应具有防腐功能。在半导体行业或腐蚀性实验中使用硫酸、硝酸和氢氟酸等强酸也要求通风柜的整体材料必须耐酸和耐碱,通常由不锈钢、PVC 或 PP 材料制成。
    Some fume hoods should be placed in electric furnaces. Some experiments will produce a large amount of acid, alkali and other highly corrosive toxic and harmful gases. The counter, lining, side plate and selected water and gas of the fume hood shall have anti-corrosion function. The use of strong acids such as sulfuric acid, nitric acid and hydrofluoric acid in the semiconductor industry or corrosive experiments also requires that the overall material of the fume hood must be acid and alkali resistant, usually made of stainless steel, PVC or PP materials.