[coffee roasting] Fire throttle control of roaster (2) | Coffee workshop

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The need to adjust the firepower and throttle of the roaster not only appears in the baking process, but also how to maintain the consistency between the initial preheating stage of the roaster and the baking of beans per furnace, which need to be adjusted to achieve.

In the daily roasting of Qianjie coffee, I use a semi-direct roaster. In the preheating stage of the roaster, I will adjust the throttle gear to the middle and the firepower to 75% of the medium and large firepower, so that the temperature of the roaster can quickly reach the bean temperature of the first pot of beans. I will continue to let the temperature rise, and when it is about 10 degrees higher than the bean temperature, I will control the firepower to maintain this temperature for about 10 minutes, and then the throttle firepower will be turned off. Let the temperature drop to the bean temperature, then adjust the throttle back to the middle, control the firepower and keep the temperature at the bean temperature for about 5 minutes, then add the first pot of beans.

The reason for this is that the degree of the temperature probe of the roaster does not reflect the temperature everywhere in the furnace, so if you just preheat it to the default input temperature at first and keep it for a period of time, then the energy stored in the boiler is likely to be lower than you can think. Generally speaking, I will not bake beans with low fault tolerance at the very beginning. I will first bake some beans with medium-deep baking degree and high fault tolerance. Generally, after 2 pots of beans, the baking machine will start baking normal beans when the state is stable.

After baking each batch of coffee, especially after a batch of deep-roasted or high-temperature beans, it is best to turn off the throttle and firepower to reduce the energy of the roaster. At this time, it may be found that the temperature of the roaster not only does not start to fall down because of the full firepower, but also the temperature will rise by several degrees. When the temperature falls by about 5 degrees, the throttle can be adjusted to the middle. The firepower will heat the roaster temperature to the bean temperature and keep it for about 1 minute. There is no need to heat the roaster to a higher temperature than the input bean because the heat of the roaster after baking the beans is more sufficient and the distribution is more uniform.