Emission Limits
Information about the emission limit values when roasting green coffee
What to consider when starting up a coffee roaster!
Emission limits when roasting green coffee
During a coffee roasting process, a. organic decomposition products such as carbon monoxide (CO), hydrocarbons (organic C), water vapor, coffee pods and the resulting gaseous air pollutant emissions of up to 10g / m3 exhaust gas.
When roasting, between 45 and 73 g of water, 50 to 110 g of organic compounds (total) and 15 to 35 g of other substances (inorganic gases, organic dusts, in particular coffee skins) are released per kilogram of green coffee [1].
Use of an exhaust gas cleaning system
To reduce and clean the gaseous emissions and to comply with emission limit values when roasting green coffee, exhaust gas cleaning systems such as Afterburner are used in the coffee, cocoa and nut processing industries and similar industries. In practice, a distinction is made between Thermal Exhaust gas cleaning and Catalytic afterburning .
The Afterburner burns the gaseous emissions by heating between 650-680 ° C before the emissions are released to the outside. The afterburner can e.g. in coffee, cocoa and nut processing industries, malting plants and similar branches are used very effectively to comply with emission limit values.
When using an exhaust gas cleaning system, it should be demonstrated that the limit values for C total (organic substances) and CO are complied with are. Furthermore, the NOx level should be able to be reduced significantly (to the target value).
The emission limit values to be observed (based on roasting of 250kg / h) are [2]:
- C complete (organic substance) =< 50 [mg/mN3]
- CO =< 0,10 [g/mN3]
- NOx(2) =< 0,35 [g/mN3]
- SOx =< 0,35 [g/mN3]
- Dust (total dust) =< 20 [mg/mN3]
[1] VDI 3892: Emissionsminderung Kaffeeverarbeitende und –bearbeitende Industrie.
[2] Verordnung zur Durchführung des Bundes-Immissionsschutzgesetzes
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