制粒工藝過程的水分控制(ppt51頁)-文庫吧在線文庫
【正文】 13 4 5 17 651蒸汽系統(tǒng)主要設(shè)備的選擇與設(shè)定 ? 鍋爐 ? 輸汽管道內(nèi)徑的確定 ? 汽水分離器 ? 疏水閥 ? 減壓 (穩(wěn)壓 )器 ? 流量控制閥 鍋爐的選擇與設(shè)置 Boiler Selection and Layout ? 燃料的選擇要全面考慮供氣穩(wěn)定性、人工、燃料價格及環(huán)境等因素 Fuel Type ? 鍋爐的功率或供氣量要留有余地 Boiler Size: Leave sufficient room ? 盡可能縮短鍋爐與用汽設(shè)施之間的距離 Location of the boiler: close to the pellet mill ID (cm) = W x v/30 W=蒸汽流量 (Steam flow),kg/min v=給定 氣壓下的比體積 (Specific volume under given steam pressure),m3/kg (查表 ) 30 = 最大流速 (allowed steam flow velocity),m/s 輸汽管道內(nèi)徑的確定 Sizing the Pipe 氣水分離器 Steam Separator ? 根據(jù)機(jī)械原理將蒸汽中的水滴與蒸氣分開以得到優(yōu)質(zhì)蒸汽 . Using a mechanical advice to remove water driplets from the steam and obtain high quality steam. ? 好的氣水分離器可移走 98%的水滴 . Good separator can remove more than 98% of the water driplets ? 其功能為將凝積水 (在進(jìn)入調(diào)制器前 )從蒸汽系統(tǒng)中排出 . To remove water condensate out of the steam system (before the steam going into the conditioner). ? 疏水閥應(yīng)不時啟閉使一定壓力下的凝積水 移到常壓的回收系統(tǒng)且不丟失 蒸 気 . It must periodically open and close to allow the pressurized condensate to be removed in to an atmospheric condensate return system without losing steam. 疏水閥 Check Valve ? 只有氣壓穩(wěn)定才能使氣流穩(wěn)定 ,從而保證制粒過程穩(wěn)定 . Steady pressure is critical for smooth steam flow and hence smooth pelleting operation. ? 減壓有助于提高蒸汽質(zhì)量 . Pressure reduction helps improving steam quality. ? 減壓 (穩(wěn)壓 )器的主要參數(shù) :流量、調(diào)壓范圍及控制的穩(wěn)定性 (可用變異系數(shù)度量 ). Parameters for consideration: Maximum flow (kg/hour), pressure rang
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