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 Geplaatst: 09-06-2020 08:29:39 Onderwerp: are mainly gas-phas |
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Cigarettes are a special kind of consumer goods, and their consumption form is not to eat or drink, but to enjoy their smoke by burning and smoking. The burning of cigarettes is a very complicated process of physical and chemical changes. Smoke formation The burning cigarette is a complex chemical system. According to scientific research, during the ignition process, when the temperature rises to 300℃, the volatile components in the tobacco begin to volatilize to form smoke; when the temperature rises to 450℃, the tobacco begins to coking; when the temperature rises to 600℃, the cigarette Be ignited and start burning. There are two forms of cigarette burning: one is the combustion during smoking, called suction combustion; the other is the combustion between the suction gaps, called smoldering (also known as static combustion). The smoke drawn from the filter end of the cigarette during smoking is called Mainstream Smoke (referred to as MS), and the smoke released from the combustion end and diffused directly through the cigarette paper into the environment is called sidestream Smoke (Sidestream Smoke, referred to as SS). 3 areas where cigarettes are burning When the cigarettes are burning, the burning end is cone-shaped. During suction, most of the air enters from the point where the combustion cone meets the cigarette paper, and a dense carbon body is formed in the middle of the cone, the air flow is not easy to pass, and the oxygen content in the center of the cone is so low that the combustion is restricted, Causing incomplete combustion. The burning cigarettes can be divided into three different regions according to their temperature changes and chemical reactions, namely high-temperature combustion zone A (see figure), pyrolysis distillation zone B and low-temperature condensation zone C. The combustion zone is located in the front of the cigarette, mainly composed of carbonized body. When smoking, the center temperature is about 825 ℃ ~ 850 ℃. The temperature of 0. 2 to 1. 0mm in front of the burning line of the cigarette paper can reach 910℃ [url=webvipsmoking.com]Marlboro Cigarettes[/url], which is also the place where the air enters the burning zone most. The temperature of the gas phase in the combustion zone is relatively low [url=vipusacigarettes.com]Cigarettes For Sale[/url], and the temperature during the pumping varies between 600°C and 700°C. After the pumping is completed, the solid phase temperature in the combustion zone cools rapidly from above 900°C to 600 within 1 second ℃. Under normal circumstances, there is sufficient oxygen supply on the surface of the combustion cone, where an exothermic reaction of carbon oxidation occurs, and the heat generated is taken away by the hot gas flow and enters the pyrolysis distillation zone C [url=cigarettesusaonline.com/marlboro-gold-online_c4]Marlboro Gold[/url]. The products generated in the high-temperature combustion zone are mainly gas-phase substances, such as carbon dioxide, carbon monoxide, water, hydrogen, methane and other lower hydrocarbon compounds and some free radicals, and some of the products diffuse through the burning carbon into the sidestream flue gas.
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