Dynamic stela BTU system for fluctuating heat supply
TECHNIP Gävle, Sweden
Sector: Timber industry, Biomass
Challenge: The main challenge was to efficiently adapt the moisture extraction and cooling of the process to the strongly fluctuating heat supply and varying ambient conditions in order to ensure a stable and maximum evaporation rate and high efficiency of the gasification process.
Solution: A specially developed rotating BTU system that combines recirculation and single pass
Dryer used: belt dryer type BTU 1-6200-27-3
Products to be dried: sawdust, wood chips
Challenge
At TECHNIP’s Gävle, Sweden facility, the main challenge in their biomass gasification process was efficiently managing the removal of moisture under varying conditions. The facility needed to adapt to the fluctuating heat supply, which changed almost hourly due to the dynamics of the upstream gasification process. The focus was on maximizing the overall evaporation ratio, especially considering the fast-changing ambient conditions and varying properties of the product. An additional critical factor was optimizing the cooling of the gasification cycle. This involved using a dryer in parallel to maintain the highest and most stable production levels for the gasifiers, ensuring the effectiveness and efficiency of the gasification process.
Solution
To overcome these challenges, TECHNIP adopted a sophisticated system incorporating both recirculation and single pass methods within a dynamic “spinning” BTU system. This innovative approach, designed to create an effective rotational movement of heat and air, allows for adaptability to the variable heat supply. At the same time, it maintains the necessary drying efficiency for the biomass, ensuring optimal performance in varying conditions.
Conclusion and outlook
The implementation of this advanced drying solution enabled the successful drying of sawdust and milled chips from 55% moisture content down to a minimum of 3%mc. The system demonstrated a stable heat consumption ranging from 18.1 MMBtu to 21.5 MMBTU (6.3 MW to 5.3 MW) in temperatures varying from -22°F to 77°F (-30°C to +25°C), while producing more than 5.5 st (5.0 mt) of dry output. This represented a significant improvement in both the efficiency and stability of the gasification process at the TECHNIP facility.
TECHNIP’s Gävle facility showcased an innovative approach to biomass drying for gasification, tackling the complexities of fluctuating heat supply and the need for homogenous drying. By integrating a versatile drying system, they not only optimized the gasification process but also set a new standard for efficiency and reliability in biomass processing.
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