Author/Wu Yiqian
Because the disadvantage of hot pot is that it requires a hot pot, it is not suitable for eating when traveling, but the emergence of self-heating hot pot makes hot pot a kind of instant noodles similar to instant noodles. Kind of possibility. It's even more "convenient" than instant noodles. You don't need to prepare boiling water, but cold water is fine, because the self-heating hot pot comes with a heating pack that will quickly heat up the ingredients.
With the implementation of garbage sorting, how to put the garbage in the "correct" trash bin has become a problem. It is very dangerous to not use the self-heating bag before, because it will produce high-temperature steam when exposed to water. It is easy to burn people. Is the self-heating pack safe after use? Can it be carried on the train or plane? Where should I throw it when I use it up?
What is the principle of the heating pack?
The self-heating hot pot is divided into two layers. The upper layer puts ingredients and water, and the lower layer puts the heating bag. When using, add water to the lower heating bag. At this time, the water and the heating bag react quickly, and the high-temperature steam rises. In 10 minutes, the water in the upper layer will boil, and in a while, a pot of steaming hot pot is ready.
Because the heating package reacts violently, many people are surprised, afraid that the box will suddenly explode. Is this worry worth it?
In fact, the technology of self-heating packs is not a new thing. This technology was first used in the research of the thermal ration of individual soldiers in the field. At the beginning, it used the reaction of quicklime to generate heat when exposed to water, and later improved to magnesium Ferroalloy heaters are currently used in the military.
is similar to this in civilian use. Generally, the main components of the heating package are: roasting , diatomaceous earth, activated carbon, quicklime, iron powder, aluminum powder, salt, and coke powder. The temperature rises immediately after encountering water. High, can produce steam of nearly 200℃, and quickly heat food. What are the roles of these chemical components?
where iron powder, aluminum powder and salt are in a water environment,It forms a galvanic cell , which can also generate heat. The coke powder plays a role of conducting electricity. The quicklime and water directly react to generate heat. The remaining calcined diatomaceous earth and activated carbon are a kind of porous structure. Substances can absorb reactants, slow down chemical reactions, and release heat more evenly.
Among them, the principle of warm baby is very similar to the above-mentioned galvanic battery reaction. The self-heating pack is only added with quicklime. Since the self-heating pack has a high temperature, it is very dangerous and cannot be used as a substitute for warming babies.
Is the heating pack safe?
The principle of self-heating hot pot is not new, and the principle of self-heating buns has been applied for a long time, such as self-heating rice , self-heating spicy hot pot, self-heating noodles and so on.
From this point of view, this is a relatively mature thing, and people have used it for a long time, so as long as the use process is in accordance with the specification, there is no problem. So what should be paid attention to when using it?
First, in order to release excess high-temperature steam, there is generally a vent hole on the top of the self-heating hot pot box. Please check whether this hole is unobstructed when using it. If it is blocked, please open it so that it will not It will explode due to the high vapor pressure in the box.
Second, the bottom of the self-heating box has an exothermic reaction, so pay attention to heat insulation. If it is placed directly on a glass table, it may cause the glass to expand and contract unevenly and break.
What should I do if the self-heating pack is used up? Can it be used on trains and airplanes?
Although the self-heating package has been widely spread, after all, the heating package can generate high temperatures on Baidu when it meets with water, so you need to be careful when using it and pay attention to safety.
So can it be used on trains and airplanes? According to current regulations, you can carry it on the train, but not on the plane. Please pay attention to it.
When the heating pack is used up,After waiting for the heating pack to cool down slowly, we can proceed to the next step.
Because the ingredients in the heating package will pollute the water source, and iron powder and aluminum powder are easy to get to the eyes and cause damage, so do not throw into the water, do not let children touch, pay attention to this when handling by yourself, please throw it in the city In the trash can. So what kind of garbage should the used self-heating pack be divided into?
After the self-heating package is used, it is less harmful and has no value for reuse, so it should be divided into other garbage (called dry garbage in Shanghai).
.References:
Li Ying, "China's Quality Travel", Issue 6C, 2018
Guo Wen, "Interesting patents 56 wonderful patent stories around me", page 26
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