Views: 67 Author: Site Editor Publish Time: 2020-08-21 Origin: Site
In winter, the weather becomes colder and drier, and many laboratory safety hazards also arise. In this season, when you enter the laboratory, prepare for the experiment, or complete the experiment, do you know what to pay attention to? Do you know how to protect yourself?
The winter is dry and dry, which is a season of frequent fires. Both the human body, equipment and facilities are prone to static electricity, which can cause fires, explosions and personal injury accidents. Therefore, in winter laboratories, strict attention must be paid to fire safety. Strengthen fire management, chemical reactions, refining, drying and other operations in chemical production must strictly implement fire prevention regulations to reduce the occurrence of disasters. Metal sodium, potassium, aluminum powder, calcium carbide, yellow phosphorus and metal hydride should be used and stored, especially not in direct contact with water, to avoid burning and explosion. In case of fire, you should calmly judge the situation and take appropriate measures to extinguish the fire; according to different situations, you can choose sand (usually gravel), foam, CO2 or CCI4 fire extinguishers.
In order to keep warm in winter, everyone likes to close the doors and windows to make the indoor air dirty. However, in the process of chemical experiments, various unpleasant, corrosive, toxic or explosive gases are often produced. If these harmful gases are not eliminated in time, they will cause indoor air pollution and affect the health of experimenters. And security. Therefore, in winter, laboratory personnel must not reduce the ventilation of the laboratory because of the cold. In the environment where toxic and harmful gases such as carbon monoxide are generated, the laboratory should also be equipped with a gas leakage alarm device while ventilating.
Laboratory ventilation requires all fresh air to come from outdoors, and 100% of indoor air is discharged outdoors. The air exchange requirement of chemical laboratory is more than 10 times per hour, and the air exchange can be reduced to 6 times when the laboratory is unmanned. When entering the laboratory, laboratory personnel should open windows for ventilation, and strengthen the inspection of the gas supply pipeline to prevent the accumulation of combustible gas indoors. The exhaust of laboratory fume hoods is not allowed to circulate indoors. The design number of fume hoods should be sufficient, and it should not be used as the only indoor exhaust device. A local exhaust system should be installed above the instrument room or the instrument that produces dangerous substances.
In winter, with the decrease of temperature, when the measured medium is transmitted to the transmitter through the measuring pipeline, the phenomenon of freezing, solidification, precipitation and crystallization often occurs when the ambient temperature is too low, and the ambient temperature is too low and exceeds the value of the instrument used. The normal operating temperature range directly affects the accuracy of the meter's measurement display. Therefore, as winter comes every year, the work of preventing cold and freezing of instruments and meters is particularly important. When the laboratory selects the instrument, according to the type and purpose of the instrument and the geographical location to be installed, the insulation and antifreeze requirements of the instrument are proposed, and then submitted to the manufacturer for processing.
Wrap the parts of the meter that are easy to be frozen or afraid of freezing with thermal insulation materials. Check and drain frequently when winter comes to prevent damage to the packaged thermal insulation materials. If the laboratory does not have thermal insulation facilities, it is better to add a self-made thermal jacket or use plastic foam for thermal insulation for temperature-sensitive instruments. The equipment, instruments, and appliances that affect the environment, such as temperature control instruments and humidity controllers, should be pre-checked to prevent abnormal conditions from appearing and affecting normal testing.
What everyone usually notices is the safety of storing chemical reagents in hot weather, but often neglecting the cold will also cause certain safety risks to the storage of chemicals.
For reagents that use water as a stabilizer, warm measures should be taken in winter to prevent the container from freezing and rupturing. Flammable items are easily oxidized and spontaneously ignite when placed in the air. They should be stored in cold water, in a cool and dark place, but in winter, the glass bottles that store them should be prevented from bursting due to freezing. Some chemical raw materials and products that are subject to deterioration in low temperature should be kept warm. Do not place heat-resistant raw materials and products near stoves and radiators, let alone press them on heating pipelines to prevent fusion and explosion.