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Using Torrefied Wood as a Coal Replacement, for Superior Pellets and Cellulosic Ethanol Production By Joe James, President Agri-Tech Producers, LLC Agri-Tech Producers, LLC Torrefaction: A Technology to Densify & Enhance Biomass – Untreated biomass may be 50% water, it’s bulky and it’s not the most efficient or useable fuel or bio-feedstock. Torrefaction: • Drives off most of the water • Reduces the bulk • Makes a better co-fire fuel to burn with coal • Makes superior briquettes and pellets – Torrefaction, applied at or near the point of harvest: • Reduces transportation costs of biomass, per BTU • Produces a more valuable biomass shipment Agri-Tech Producers, LLC Torrefaction: Adding Value and Reducing Transportation Cost/BTU • Untreated Biomass: • Torrefied Biomass: – Bulky – Dense, If Pelletized, Etc. – Moist – Dry & Water Resistant – Fibrous – Easily Crushed – Perishable – Does Not Rot – Waste – Valuable Fuel – Expensive to – Energy Dense transport : Agri-Tech Producers, LLC The Process of Torrefaction • Heating (300-400º C) wood, in a low-oxygen environment, liberates water, volatile organic compounds (VOC’s), and hemicellulose (HC) from the cellulose and lignin. • The VOC’s and HC are combusted to generate 80% of the torrefaction process heat. • The remaining and warm lignin acts as a binder when the torrefied wood is pelletized. • Torrefied wood can easily replace coal in combustion or be a feedstock for further pyrolysis or gasification for combined heat and power or Fischer-Tropsch liquids. Agri-Tech Producers, LLC Schematic of Torrefaction Machine Agri-Tech Producers, LLC Higher Heating Value of Torrefied Wood, Charcoal and Coal: Higher Heating Value of Torrefied Wood, Charcoal and Coal: Color Approximately Indicates Heating Value Color Approximately Indicates Heating Value 16,000 13,471 14,000 11,633 12,000 9,248 8,458 9,060 9,502 8,805 Lightest Lighter Light Dark Darker BTU/lb. 10,000 12,000 8,000 6,000 4,000 2,000 Darkest Charcoal Agri-Tech Producers, LLC Coal Chemistry of Torrefaction • At torrefaction temperatures, hemicellulose is the primary wood polymer that is degraded into: – Permanent gases include H2, CH4, aromatics, CO, CO2, CxHy – Condensable liquids include acids, ketones, furans, alcohols, terpenes, phenols, waxes, tanins, water – Solids include char, new and existing sugar structures and new polymers and ash. • All of the wood polymers undergo dehydration reactions that destroy –OH groups that are responsible for hydrogen bonding with water: this severely reduces the tendency of densified torrefied wood to absorb water. Agri-Tech Producers, LLC Mass and Energy Balance of Torrefaction • Published results indicate mass and energy balance of .8 and .9 respectively (for dry wood). • This is consistent with the loss of the lower energy VOC and hemicellulose and retention of higher energy lignin and cellulose. • Assuming – – – – – 50% MC wood, HHV of 8700 Btu/lb for dry wood, 1000 Btu/lb latent heat of water, .4 Btu specific heat for wood and 1 Btu specific heat for water, Starting temperature of 75 F and exit temperatures of 500° F. • ~800 Btu used in processing, this energy is approximately equal to that of the VOC’s and hemicellulose. • ~3575 Btu left in remaining torrefied product, which weighs ~.33 lbs, for a HHV of 10,800 Btu/lb. Agri-Tech Producers, LLC Making Electricity With Torrefied Wood • Torrefied wood is a much better fuel for co-firing with coal than untreated wood. • Torrefied wood can be ground to a particle size, similar to that of pulverized coal, with the same or less energy use. • Untreated wood requires many times the energy use, in grinding (by a factor of 7.5 to 15), to achieve a similar particle size. Agri-Tech Producers, LLC Pelletizing & Briquetting Torrefied Wood • At torrefaction temperatures, the lignin in wood becomes plastic and can actually become a binder of individual wood particles. • Pellets made from torrefied wood may withstand 1.5 to 2 times the crushing force of normal wood pellets. • Torrefied pellets show little water uptake on immersion (7-20% of mass), unlike normal pellets. • University research in the 1930’s and 1940’s details benefits of torrefied wood pellets. Agri-Tech Producers, LLC Density of Various Biomass Fuels Fuel Green Wood Chips BTU/lb 4,500 Density 3 lbs/ft Specific Gravity 3 BTU/ft 21.29 0.341 95,804 7,300 40.00 0.641 292,000 Torrefied Wood 11,000 12.57 0.202 138,314 Pulverized Torrefied Wood 11,000 23.69 0.380 260,545 Pelletized Torrefied Wood (sample) 11,000 28.41 0.455 312,456 Pelletized Torrefied Wood (Bergman) 8,545 46.82 0.750 400,085 Baled Corn Stover (25% MC) 6,076 9.38 0.150 56,961 Baled Switchgrass (15% MC) 6,722 7.43 0.119 49,940 Wood Pellets Agri-Tech Producers, LLC DeliveredFuel Cost MMElectricity Btu Electricity Cost per per MMBtu by Distance Plant by Distance totoCustomer $17.00 $/MMBtu E $15.00 $13.00 $11.00 $9.00 $7.00 $5.00 0 20 40 60 80 Miles Coal ($90/ton) Green Wood Coal ($75/ton) Torrefied Wood Agri-Tech Producers, LLC Coal ($60/ton) 100 Delivered Cost Chart Assumptions Coal is valued at $60 to $90 per ton delivered price That torrefied wood (11,000 BTU/lb.) has a heating value nearly that of coal (12,000 BTU/lb.) and That torrefied wood generates electricity with a similar efficiency to coal (35% fuel to electricity) Untreated wood has a lower efficiency of conversion (23% fuel to electricity) And wood can be processed into chips at a cost of about $15/green ton $4.00/torrefied ton processing cost Transportation costs for chips and torrefied wood are about $0.23 per ton per mile. Agri-Tech Producers, LLC Agri-Tech Producers, LLC ATP’s Partner: Kusters Zima Corporation 101 Zima Park Drive / I-85 Business Spartanburg, S.C. 29301 Tel: (864) 576-0660 8.74 Acres (35,362 Sq. Meters) Building Constructed in 1969 80,128 Total Manufacturing Sq. Ft. (7,444 Sq. Meters) Kusters Zima has over 40 years experience in engineering and manufacturing machinery for many various industries. • Complete Metal Fabrication including Welding, Cutting, Forming and Piping. • Machining Capabilities that include CNC Turning and Vertical Milling Centers. • Complete Mechanical and Electrical Engineering with the latest Software Versions of SolidWorks and AutoCad. • Complete Mechanical and Electrical Assembly and F.A.T. for Production Machines and Prototypes. • Installation and Start-up Supervision. Complete Manufacturing • Water & Waste Water Equipment Grit Removal & Washing Course & Fine Screenings Classifiers CSO Screens Dewatering • Carpet & Textile Equipment Continuous Preparation Dye Washers & Scour Ranges Steamers Liquid Dispensing Water & Dry Lint Removal Systems • Contract Sales Piece Parts & Components Customer Specific Design & Build Build to Print ATP Resource: Mid-South Engineering Complete Engineering Services Production Process Development Process Conceptual Design Process Control Drawings Energy Conservation & Conversion Systems Helping manufacturers of pellets, briquettes, and other biomass products improve existing facilities or design and construct new facilities to meet the growing demand for renewable energy products. Hot Springs, Arkansas - USA 1658 Malvern Avenue Hot Springs, AR 71901 PH: 501-321-2276 Civil Engineering Services Site Evaluation Grading & Drainage Plans Road & Railway Layouts Structural Engineering Services Equipment Foundations Building Foundations and Structures Machinery/Equipment Supports Fall Protection Systems Mechanical Engineering Services Custom Equipment Design Process Heating & Cooling Systems Design Piping Systems Equipment Specifications Electrical Engineering Services Power Distribution System Design Control System Design Lighting & Grounding Systems Communication Systems Electrical Power System Studies Arc Flash Studies Cary, North Carolina - USA 1149 Executive Circle, Suite A Cary, NC 27511 PH: 919-481-1084 Visit us at www.mseco.com Project Management Services Project Management Project Scheduling Contract and Invoice Administration We have over 40 years of experience in designing structural, mechanical, and electrical systems for major industrial facilities throughout North America and other locations around the world. Construction Services Turnkey Construction Construction Management Start-up Services Safety Coordination Using Torrefied Wood as a Coal Replacement, for Superior Pellets and Cellulosic Ethanol Production Joe James, President Agri-Tech Producers, LLC (803) 462-0153 [email protected] Agri-Tech Producers, LLC