General knowledge of coffee roaster after burner system
Post-burner system, also known as direct-fired thermal oxidizer system.
Direct-fired thermal oxidizer or post-burner is the simplest kind of thermal oxidizer, which can greatly reduce VOC emissions by instantly cremating soot or carbide ions into clean water vapor at a high temperature of about 500C.
This kind of thermal oxidizer does not carry any heat recovery equipment and cannot recycle the heat generated in the combustion process. Typical direct-fired thermal oxidizer systems usually include burners, combustion chambers, fans, air / fuel control assemblies, thermal instruments and automatic control systems, and chimneys.
Generally speaking, direct-fired thermal oxidizers have less investment than other types of thermal oxidizers. However, when this kind of thermal oxidizer is used to treat endothermic waste fluid, the operating cost (fuel consumption) is relatively high. for example, the gas consumption of coffee roaster with "post-burner" is more than three times that of baking itself before installation.
The "post-burner system" in aerospace dynamics is a completely different concept.
VOC (volatile organic compound)-definition
The American ASTM D3960-98 standard defines VOC as any organic compound that can participate in atmospheric photochemical reactions. The Federal Environmental Protection Agency (EPA) defines volatile organic compounds as any carbon compounds that participate in atmospheric photochemical reactions except CO, CO2, H2CO3, metal carbides, metal carbonates and ammonium carbonate.
The World Health Organization (WHO,1989) defines total volatile organic compounds (TVOC) as volatile organic compounds whose melting point is lower than room temperature and boiling point is between 50 and 260 ℃.
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Small "soil cannon" square baking cabin without motor
My friend gave me a small baking toy, which I should have tried last week, but because I didn't play with my work for a long time, I can finally touch it today. According to the definition of many players, this small toy should be classified as a local gun, and it is a local gun without an electric motor. In particular, this local cannon is different from the previous barrel baking chamber, but is square, which can be called roasting cube
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General knowledge of coffee bean baking equipment and roasting theory of coffee beans
In addition to the degree of baking is divided into factions, even the roaster also has a family view. At present, there are two major professional roasters, one is the traditional rolling furnace (Drum Roaster), and the other is the newly developed hot gas furnace (Air Roaster). The former is heated by gas across the bottom of the furnace, while the metal blades in the furnace keep stirring the beans, while the latter bakes the beans with high-temperature hot air flow.
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