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BC Bugwood Envirochem Services Inc. Compaction: A chip compaction tractor having a container 20 feet in length for difficult terrain and 40 feet in length for good terrain is used to transport the chipped biomass to the prehydrolysis site using logging roads inside the forested area. Transportation between the compaction site and the prehydrolysis plant is limited to a minimum of 15 km and a maximum of 35 km for optimal efficiency. Figure 4.2.4 shows a typical chip transport truck equipped with a compaction system. Prehydrolysis: Prehydrolysis sites are located in Bugwood Management Units, approximately 15 to 35 km apart. They need to operate in areas which have road access and are located near the electrical grid. Alternatively, a CHP system similar to that described in Section 4.3 can be used to provide the power and heat to the prehydrolysis plant to minimize chip transport costs if it cannot be located near the power grid. This allows locating these plants in more remote areas to access significantly more bugwood infected areas. The process energy requirement is only 6% of the HHV of the original biomass, which is partly achieved by compaction of the wood chips in the reactor and recuperation of the process heat from the prehydrolysate liquor. The reactor can also be placed on a mobile truck and allow to completely utilize all the available wood (trunk, bark and branches), as shown in Figure 4.2.5. The heat to the reactor can be supplied using a boiler fired with biomass chips or by an atomization burner fed with CL. The water used in the process is treated and reused requiring only minimal makeup water. Feeding Platform 1 BDT 1 BDT 0.8 Tonnes 0.5 Tonnes Bugwood Bugwood CL Water Feeder Biomass chipped tractor container Power feeder/pressurize feeding time Density compacted biomass Steaming (heat recovered) Pre-hydrolysis Liquor extraction Steam Recycled water Weak acid Liquor to ETS Pressure Temperature Net heat requirements Recycled water Water to WTS and pond Heat recovery of liquor 60 kW 10 minutes 300 kg/m3 10 Minutes 30 Minutes 10 Minutes 0.5 Tonnes 1 Tonnes 2 Tonnes water/ 1.7% H2SO4 1.7 Tonnes 0.62 MPa 160 oC 6 Tonnes 6 Tonnes Reactor Three Washings Briquetting Grinding Figure 4.2.3 Prehydrolysis Processing Steps Page 26PDF Image | IDENTIFYING ENVIRONMENTALLY PREFERABLE USES FOR BIOMASS
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