The afterburner system of the coffee roaster to understand the configuration of the structural parts of the coffee roaster

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 ℃.

Source: Via @ Huang Wei boutique coffee roasting