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BC Bugwood Envirochem Services Inc. The prehydrolysis process consists of filling the reactor with the preheated dilute acid solution, heating, pressurization, and imparting rotary oscillations. The discharge of the resulting dilute liquor follows a heat recovery process and a sugar-recovering washing operation. The CL has three washing operations. Heat from biomass conversion is then used to dry the CL to 500 ppm of moisture using air temperatures of 125oC. Access to the bound water is no longer problematic and therefore pre-drying requirements for heat and power applications are reduced considerably. The inorganic material reacts with the dilute acid forming soluble sulfates that are extracted from the wash water. Washing can be done with normal recycled water or deionized water obtained from within the process to further reduce the ash and inorganics. Washing with deionized water further reduces the inorganics present in the CL to reduce the impact during direct fired gas turbines. The process limits the liquid to solid ratio to 2 which may allow the treatment using deionized water in applications. Table 4.2.4 Approximate Distribution and Location of Prehydrolysis Plants BMU Average Daily Bugwood Harvest 2011 Prehydrolysis Plants Dry basis (m3) Dry basis (BDT/day) # Size (BDT/day)1 Vanderhoof Lakes Quesnel Merritt 100 Mile House Williams Lake Cranbrook Boundary Morice Lillooet Ft St James Invermere Kamloops Arrow Okanagan Mackenzie Kootenay Lake Bulkley Prince George Golden Robson Valley Cranberry Dawson Creek 3,400 2,200 3,680 416 1,072 1,540 275 54 364 121 683 265 336 244 127 46 145 50 897 135 73 0 0 1,292 836 1,398 158 407 585 105 21 138 46 260 101 128 93 48 17 55 19 341 51 28 0 0 1 1 1 1 1 1 1 1 1 540 360 540 90 180 360 90 180 180 Total 16,123 6,127 9 2,520 Note 1: Plant size is considerably undercapacity to account for the bugwood aviablity as being transitory from 2005 to 2020. Other feedstocks can be used afterwards. Figure 4.2.6 shows the Biomass Refinery Materials Program consisting of a sequence of eleven technologies producing ten products. For the BC Bugwood issue, the proposed method relies on using only the upper portion of the Biomass Refinery Plant: prehydrolysis, effluent treatment station, dryer and briquetting. Other technologies or plant expansion could include the Low- Temperature-Conversion for zero discharge of liquids, if desired. Nutrients could be returned to the forest through fertirrigation. The bottom part of the Biomass Refinery shown in the same figure is used at the end point consumption to obtain economies of scale and allow maximizing profits from the operation Figure 4.2.7 shows the layout for a 1,054 BDT/day biomass refinery plant. Page 28PDF Image | IDENTIFYING ENVIRONMENTALLY PREFERABLE USES FOR BIOMASS
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