Biochar Production System Using Indirect Oil Heating

The patent introduces a heat transfer oil as an intermediary medium between the heater and the organic waste. The heat transfer oil circulates through pipes embedded in the drying chamber, providing uniform heat distribution to the organic waste. This intermediary system ensures steady temperature control and even heat transfer, resolving the issue of temperature instability and uneven heating that previously resulted in low quality biochar.

The patent replaces the direct heated-air drying system with a liquid heat transfer oil circulation system. Instead of using hot air that难以 maintain steady temperature and uniform distribution, the system uses heat transfer oil circulating through embedded pipes, which provides more stable and controllable heat transfer. This substitution of the heating mechanism achieves both steady temperature and uniform heat distribution.

The patent converts the harmful effect of moisture evaporation during carbonization into a beneficial heat source. The water vapor and gases released during pyrolysis are captured and passed through heat exchange pipes, where their thermal energy is recovered and used to preheat the heat transfer oil. This converts what would be wasted energy into a useful heating source, reducing overall energy consumption while maintaining carbonization productivity.

The patent implements a continuous heat recycling system where the heat from pyrolysis gases is continuously captured and reused to preheat the heat transfer oil. This continuous recovery and reuse of thermal energy creates a closed-loop system that maintains carbonization productivity while significantly reducing external energy requirements through ongoing heat recycling.

The patent implements a preheating stage where the organic waste is gently heated to evaporate surface moisture before the main carbonization process. This preliminary drying action removes excess water that would otherwise interfere with carbonization, while consuming minimal energy compared to complete drying. The preheating prepares the material for efficient carbonization without requiring excessive energy input.

The patent changes the heating parameters during the process - using lower temperatures for preheating and moisture evaporation, then increasing temperature for carbonization. By dynamically adjusting temperature parameters rather than maintaining high heat throughout, the system achieves feasible carbonization while minimizing drying energy consumption. The heat transfer oil circulation system enables precise parameter control throughout the process.