The choice of laboratory furniture should consider improving work efficiency, working convenience, and reducing the risk and injury of occupational diseases. Regardless of whether the laboratory chooses steel-wood structure or all-steel structure furniture, it must be reasonably selected and matched according to the overall requirements of the laboratory. Mainly from test bench specifications, test bench surface material, test bench cabinet material, test bench water, electricity, gas integration functions, etc.; and the fume hood, as the most important laboratory in the laboratory, is also one of the furniture with high hazard coefficients. First, you must be more cautious in the selection process. The following will systematically explain the function and selection of the fume hood.
Selection of fume hood and precautions for use
In chemical experiments, various harmful gases, odors, moisture, and flammable, explosive, and corrosive substances are often produced; in recent years, in order to protect the safety of experimental technicians and improve the experimental environment, many of them were originally on the experimental bench. The experiments carried out are gradually transferred to the fume hood to prevent the pollutants in the experiment from spreading to the laboratory. It is the best way to put the experiments that constitute the pollution source into the fume hood; the function of the fume hood is mainly to isolate the hazard source and the outside. Row processing.
With the development of the economy and the requirements of personnel in the working environment, generally larger areas of experiments are equipped with central air-conditioning systems. Some laboratory construction units consider factors such as loss of cooling capacity and increased energy consumption and prefer to choose supplementary ventilation. Cabinet: The feature of the supplemental air fume hood is that it is equipped with an air supply port on the top of the front, which sends a certain proportion of air into the fume hood from the outside. When the cabinet door is opened, the airflow forms an air curtain at the operation port to block harmful gas overflows, and only a certain proportion of the remaining air is replenished indoors.
Although the supplementary air fume hood can have advantages in energy saving, it also has the following problems:
1. Since the supplemental air fume hood adds an air supply system, the initial investment increases, and the required power consumption also increases, that is, the operating cost increases. Therefore, when the supplementary air fume hood is used, the overall system should be The payback period is evaluated.
2. The energy saving of the supplementary air fume hood is attributed to the use of outdoor air that is not heated or cooled, which will affect the indoor air temperature and humidity conditions, especially in the northern winter, the outdoor temperature is very low, which may bring discomfort to the human body The operator’s safety is reduced, and the operation results of many supplementary air fume hoods are not energy-saving, and some systems even consume more energy than traditional fume hoods.
