Can the pipeline start a fire with ethylene glycol aqueous solution as a refrigerant?

Yes, the flash point is not low, it is more difficult to volatilize in addition, and there is water at the same time.

This is a special case that I have handled, and we can learn some knowledge and experience through the analysis of this case:

In my group there is an aquarist from Huadian, Jilin, I personally guided him to open the tank, 1 meter of the tank, the configuration is completely the same as my bare tank (upper filter + filter barrel), the use of ceramic sand and white cotton as filter material, open the tank under the em bacteria and 2 parrots and 1 scavenger to do the tank fish, 15 days to open the tank successfully, ammonia and nitrite are all zero, under the main fish Arhat.

The process was perfect, the water was clear and there were zero toxins, but a month later he suddenly came to me and said that there was something wrong with the fish: the fish had shrunken head, black color, loss of appetite, inactivity, white skin on the head and body, and a lot of mucus; The nitrite index detected was zero, and the ammonia reached 4, which was seriously exceeded. This situation surprised me, because I have guided so many aquarists have never encountered such a situation, the analysis at that time was ammonia poisoning, immediately stopped eating and changed the water, and the water changed for 10 days in a row, the detection indicators were normal, and the state of the fish recovered.

But there is one question that always bothers me, what is the factor that causes the sudden rise in ammonia and the nitrite is zero? Asking the aquarist if he hadn't drugged or anything else that could damage the nitrification system left me puzzled.

The solution will definitely not**. Only when the flammable material reaches the limit after volatilization, it is possible to encounter an open flame. The aqueous solution of ethylene glycol is generally used for laboratory refrigeration and is relatively safe.

A 10% aqueous solution is also very safe. We use it in our lab all the time. Our upstairs and downstairs labs have also been using Rest assured!

Don't pay special attention.

2.If it is a 10% aqueous solution during transportation in summer, it is also safe to use a plastic bucket, you can rest assured! I don't have a physical chemistry manual at hand, so I can't help you find specific data, but because the number of hydrogen bonds will be more than that of ethanol, the boiling point and volatility should be lower than that of ethanol.

If you think about it, the 65% of the wine we drink is very safe during transportation and storage, so there should be no major problems.

It depends on the concentration of the solution. Pure ethylene glycol.

The boiling point of the aqueous solution is 197°C, and the boiling point of its aqueous solution is between 197°C and 100°C, depending on the concentration of the solution. If the boiling point is higher than 130°C, there is no need for pressurization, one atmosphere. That's it.

Ethylene glycol is used as a refrigerant mainly to reduce the freezing point, but it is not used all, generally according to the refrigeration temperature, add 20 50%.

ethylene glycol type; The concentration ratio is: 55% - liquid 45% - water, boiling point: 107; Freezing Point: -40.

Depending on the temperature of the required precaution, 1 3 times the amount of water can be added, and usually when the water is mixed in a ratio of 1:1, the freezing point of the coolant will be lowered. The maximum concentration of glycol-water antifreeze is 75%, so remember not to exceed this concentration.

Water molecules are formed into molecular clusters through the association of hydrogen bonds, with a high freezing point, if water is used as the coolant alone in winter, it will freeze below 0 and cannot flow, not only can not play the role of circulating cooling when starting, but also because water becomes ice crystals is a process of volume increase, usually the same mass of water is mentioned to increase by 9% 10% when it becomes ice. The resulting swelling force will expand and crack the radiator and pipeline and other components, in the antifreeze containing ethylene glycol, due to the existence of ethylene glycol, the initial freezing point is much lower than water, when the freezing point is reached, the ice crystals precipitated into a slurry, and the content of ethylene glycol in these ice crystals is low, obviously most of the ethylene glycol is still left in the unsolidified liquid phase, the result is to make the freezing point of the solution that has not yet crystallized lower, it is because of this characteristic of ethylene glycol, Therefore, the actual temperature of antifreeze containing ethylene glycol can be lowered a little lower than the measured freezing point. Of course, the freezing point will rise after the lowest point (-69, the concentration of ethylene glycol is 68%), so it is futile to think that increasing the concentration of ethylene glycol to achieve a lower freezing point is ineffective in the end.

Replace the stainless steel pipes. The containers used for the storage and transportation of ethylene glycol are all stainless steel containers.

Preservatives are generally added.

The so-called ethylene glycol refrigeration unit uses ethylene glycol as a refrigerant for refrigeration and heating, and is mainly used in connecting the test object to a test platform adapter. The inside of the component is cooled and heated by an aqueous glycol solution. The components are placed in the environmental chamber as a whole, and the environmental chamber as a whole provides a high temperature and low temperature environment.

The test component undergoes a specific temperature curve and the temperature change is recorded. The range of temperature variation is usually from -40 to 150 degrees. When a tolerance test is performed, it is usually performed in an infinite loop.

But with significant drawbacks. The freezing point is too high.

Eco-friendly, cheap, convenient, high specific heat.

The safety color of the ethylene glycol industrial pipeline is black.

According to the "Basic Identification Color, Identification Symbol and Safety Identification of Industrial Pipelines" GB7231-2003, non-flammable liquids are black. However, ethylene glycol is used as a refrigerant, and its pipeline needs to be insulated, and the insulation outer sheath can be identified with a rectangular identification color label with arrows.