High temperature continues, attention should be paid to the safety of hazardous chemicals!

Recently, the temperature in Lishui City has reached more than 40 ° C, and the high temperature continues, which has increased the safety storage threat of dangerous chemicals. When producing, transportation, and storage of hazardous chemicals, all enterprises must strengthen safety protection and do a good job of preventing heat and cooling, so as to avoid fire and explosion accidents.

Why do the fire of chemical dangerous goods occur in the high temperature season?

The first is to increase temperature to increase the volume pressure of dangerous chemicals

Thermal expansion and contraction are the general physical phenomenon of objects. The internal pressure of the container increases, if it exceeds the pressure that the container can bear, it will cause the container failure and even burst. If the container is open, the liquid expansion will spill over its capacity, and running, rushing, dripping, and leakage occur. In order to prevent this, in addition to taking heat -resistant and cooling measures, it is also necessary to fill in according to the prescribed charge coefficient. As far as gas is concerned, its expansion coefficient is even greater. Gas is generally installed in the cylinder. As the temperature rises and the pressure is too high, the cylinder is risk of explosion.

Second, the temperature increases to speed up the evaporation of the liquid

The higher the temperature, the faster the flammable liquid evaporates, the greater the steam concentration on the liquid surface, the greater the possibility of forming an explosive mixed gas with the air, and the greater the risk of fire explosion. The evaporation speed of different liquids varies depending on temperature, boiling point, proportion, and pressure. The difficulty of evaporation of flammable liquids is expressed by boiling points. The lower the boiling point, the stronger the evaporation of the liquid. The boiling point of some flammable liquids is very low, and the ambient temperature exceeds its boiling point, which is prone to danger.

Third, the temperature is elevated, accelerated oxidation, decomposition and spontaneous combustion

Affected by environmental factors such as temperature and humidity, many hazardous chemicals are easily decomposed after heating, which releases oxygen or even oxygen atoms, oxidize other substances, and at the same time releases a lot of heat. If the ventilation is poor, the heat accumulation does not disperse, which will increase the temperature, which will speed up the oxidation rate, generate more heat, and promote the temperature to continue to rise. When the temperature reaches the spontaneous combustion point of the material, the material will spontaneously ignite.

What are the measures for the safety storage of dangerous chemicals in high temperature season?

1. Storage warehouse must be qualified

The hazardous chemical warehouse should be used as the insulation layer of the roof and walls of the non -thermal conductivity.

The warehouse should be properly thickened. The windows are often opened, and the indirect ventilation caves are used to set up double -layer doors and double -layer roofs; window glass paint into blue or choose frosted glass.

2. Dangerous chemicals need to be classified and stored in dangerous chemicals. It is generally divided into explosive items, water combustion items, spontaneous combustion items, flammable solids, flammable solids, flammable solids, and help gas, corrosive items, oxidants, etc.

The storage of these items should be classified, database, section, and separation. It is strictly forbidden to mix all kinds of objects that are conflicted with each other, the method of fire extinguishing, and easily cause spontaneous combustion.

When storing items, the stacks should not be too high, too large, and too dense. The stacks and stacks, stacks, walls, columns, roof beams, and electric lights should be kept a certain distance, and fire channels are left, and no amount of storage shall be stored.

Third, the temperature should be strictly controlled

Set the water storage roof for the warehouse or set the cooling water pipe on the warehouse roof. When the temperature is above 30 ° C, spray the water to cool down, so that the temperature in the warehouse is below 28 ° C.

Putting stone sacks on the roof of the warehouse can increase the thermal insulation performance of the roof. It can also paint the roof, exterior walls and windows glass of the warehouse, and use the white reflection effect of the sun to reduce the absorption of radiation heat and achieve cooling.

According to the nature and packaging of the item, water and ice cubes can also be poured on the warehouse floor, and the air conditioners can be installed with conditions to cool down. Some warehouses can open windows in the morning and evening and night, put them in cold air, and close the doors and windows at noon to prevent hot air from entering.

Fourth, open -air stacks and tanks to cool down

The flammable liquid of the barrel should be placed in the building to prevent the sun directly. If you need to store temporary open -air under special circumstances, you should use non -combustible materials to build a sunshade shed, and sometimes it should be used to cool the water regularly with a leather tube.

The cooling device should be set on the top of the storage tank. When the temperature reaches 30 ° C, the cooling water pump is turned on for spraying. The tank cannot be installed too much. Generally, only 90 % to 95 % of the volume in the barrel is 5 % to 10 % of the volume space. Essence

5. Install lightning protection facilities

The hazardous chemical warehouse is generally located in the edge of the unit or the city, and keeps a certain distance from the surrounding buildings. In this way, an open area is formed around the warehouse, which is easy to suffer lightning. Therefore, the warehouse should install a lightning protection device to prevent lightning caused by lightning.

6. Strengthen personnel management

Safety management personnel must be trained and passed through the assessment to hold a certificate. Library management personnel should inspect the warehouse regularly, find out problems in time to ensure the safety of warehouses and storage of goods.

Article Source: Municipal Emergency Administration Bureau

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