Biomass & Bioenergy

Direct combustion of biomass remains the most commercially mature bioenergy pathway, and it is where CPE has the longest track record. We design and optimize boiler systems firing wood waste, bark, sawdust, hog fuel, agricultural residues, bagasse, rice hulls, and other solid biomass fuels across bubbling fluidized bed (BFB), circulating fluidized bed (CFB), and vibrating grate and traveling grate stoker platforms. Our scope covers combustion system design, fuel handling and metering, grate and distributor plate design, overfire air systems, sootblower optimization, and the full range of ash handling and disposal.

Biomass fuels present challenges that fossil fuels do not - high and variable moisture content, low ash fusion temperatures, slagging and fouling from alkali metals, chlorine-induced corrosion, and fuel density and flowability problems. CPE has developed internal tools for biomass fuel slagging and fouling assessment, furnace exit gas temperature (FEGT) prediction, and combustion modeling that account for these fuel-specific behaviors rather than treating biomass like low-grade coal.

Torrefaction produces an energy-dense, hydrophobic solid fuel from biomass through mild thermal treatment (200-300°C in an oxygen-deprived environment). CPE engineers the reactor systems, heat integration, volatile handling, and downstream pelletizing or briquetting operations that turn raw biomass into a drop-in replacement for coal in existing power plants. We address the specific engineering challenges of torrefaction - tight temperature control to avoid crossing into pyrolysis, managing condensable and non-condensable volatiles, and integrating the energy content of process off-gases back into the system.

Hydrothermal carbonization (HTC) takes a different approach - using water at elevated temperature and pressure to convert wet biomass (including high-moisture feedstocks like sewage sludge, food waste, and algae) into hydrochar without the energy penalty of pre-drying. CPE provides process engineering for HTC reactor systems, slurry handling, solid-liquid separation, and process water treatment. The ability to handle wet feedstocks that would be uneconomical to dry for conventional combustion or pyrolysis makes HTC a distinct technology pathway, and CPE scopes it accordingly.

The emerging SAF and renewable diesel industry relies on thermal conversion pathways - Fischer-Tropsch synthesis from biomass-derived syngas, alcohol-to-jet conversion, hydroprocessed esters and fatty acids (HEFA), and pyrolysis-based pathways - that all require fired equipment, heat exchangers, reactor heating systems, and steam generation. CPE provides process heating and steam system engineering for these facilities, addressing the fired equipment, heat recovery, and utilities infrastructure that supports the core conversion chemistry. As SAF production scales from demonstration to commercial plants, the engineering challenges shift from proving the chemistry to designing reliable, efficient thermal systems that run continuously at industrial scale - exactly where CPE operates.

Before any capital commitment, CPE helps project developers and plant owners understand whether a biomass project makes engineering and economic sense. Feasibility studies include fuel characterization and supply analysis (moisture, ash composition, heating value, alkali and chlorine content), slagging and fouling risk assessment using CPE's internal prediction tools, technology selection - matching the right combustion or conversion platform to the fuel and the project economics, performance modeling and heat balance development, capital and operating cost estimation, and emissions permitting pathway analysis.