制粒工藝過程的水分控制(ppt51頁)(完整版)
【正文】 e, pressure stability (expressed as CV%). 減壓 (穩(wěn)壓 )器 Steam Pressure ReducerRegulator ? 控制進(jìn)入調(diào)制器的蒸汽流量 .只有物料流量與蒸汽流量同步控制才能實(shí)現(xiàn)穩(wěn)定的制粒作業(yè) . It meters the steam flow going into the conditioning chamber an important device for operator ? 調(diào)制器操作與流量應(yīng)是線性關(guān)系 . A linear response is required between control valve and steam flow. ? 一般的控制閥的操作與實(shí)際流量不是線性關(guān)系 . The gate valve is nonlinear at half opening, small changes in setting results large steam flow variation. 流量控制閥 Steam Flow Control Valve ? 減壓、分水、氣壓控制三合一 A separator trap pressure regulator “three in one”device. ? 流量控制閥在自動(dòng)和手動(dòng)控制條件下均與流量呈線性關(guān)系 . Linear steam flow control valves for both manual and automatic control system Cospect Valve 蒸汽調(diào)制系統(tǒng)參數(shù)的設(shè)定Parameter Settings in Steam Conditioning ? 考慮因素：調(diào)制時(shí)間、蒸汽質(zhì)量、飼料配方 . Factors to be considered: Retention time, steam quality and formulation/ingredients. ? 對(duì)于一般飼料配方，應(yīng)在不塞機(jī)的前提下，盡可能提高料溫 . In general, mash temperature should be conditioned “as high as possible” before reaching the “chock point”. 減壓前后的壓力比 Pressure Ratio before –after Pressure Reducing Valve 減壓可使蒸汽中的水滴揮發(fā) . 減壓幅度過大 ,在蒸汽質(zhì)量好時(shí) ,可形成過熱 (不飽和 )蒸汽 . Pressure reduction helps water drip lets flash off but may also produce a supperheated steam if the pressure drop is too much and the steam quality already very high. ? 一般推薦 : :1 General Remendation: 34 to 1 進(jìn)入調(diào)制室的蒸汽壓力設(shè)定 Steam Pressure Setting before Conditioner ? 調(diào)制時(shí)間短，蒸汽質(zhì)量好，宜采用低蒸汽壓 ( kg /cm2 或 更
教學(xué)課件相關(guān)推薦
鄂ICP備17016276號(hào)-1