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<span>鍋爐供水化學凈化過程極值的控制</span></p> </div>   <div id="qprrcczb" class="ly_NyNewsdetail"> <h1 class="NyNewsdetail_title">鍋爐供水化學凈化過程極值的控制</h1> <div id="qprrcczb" class="NyNewsdetail_tips">更新時間：2019-09-29 點擊次數：1788</div> <div id="qprrcczb" class="NyNewsdetail_con"> <p><span style="font-family:宋體"> 鍋爐用<strong>軟化水</strong>制備技術路線除離子交換法之外，向原水中投加藥劑的化學凈化工藝技術</span> <span style="font-family:宋體">路線也常被應用。理論分析和實踐驗證表明：水的凈化反應首要條件是</span>pH=10~10.4<span style="font-family:宋體">的狀態(tài)下，因此有一種控制方案是用</span>pH<span style="font-family:宋體">調節(jié)器將原水的</span>pH<span style="font-family:宋體">值保持在上述范圍內。但是，由于</span>pH<span style="font-family:宋體">反應曲線的嚴重非線性，中和反應的動態(tài)控制范圍很窄，尤其在有明顯純滯后的工藝過程中采用傳統(tǒng)的定值調節(jié)系統(tǒng)很難奏效，加之</span><strong>pH</strong><strong><span style="font-family:宋體">電極</span></strong><span style="font-family:宋體">易于被污染和損壞，因此這種方案的實際應用受到很大程度的限制。前蘇聯(lián)學者澤依捷爾</span>(K.Г.Дe?genb)<span style="font-family:宋體">提出了在化學凈水工藝中利用極值調節(jié)器保持水體電阻率為大值的控制策略獲得很好的凈化效率。其理論依據如下。</span> </p><p><span style="font-family:宋體"> 對于投加石灰的反應過程</span></p><p> Ca(HCO<sub>3</sub>)+Ca(OH)<sub>2</sub>→2CaCO<sub>3</sub> ↓ +H<sub>2</sub>O</p><p> CO2 + Ca(OH)<sub>2</sub>→CaCO<sub>3</sub> ↓ +H<sub>2</sub>O</p><p><span style="font-family:宋體"> 對于</span>H-Na<span style="font-family:宋體">離子交換的反應過程</span></p><p> NaHCO<sub>3</sub>+HCl →NaCl+H<sub>2</sub>O+CO<sub><span style="font-family:宋體">2</span></sub><span style="font-family:宋體">↑</span></p><p> 2NaHCO<sub>3</sub>+ H<sub>2</sub>SO<sub>4</sub>→N a<sub>2</sub>S0<sub>4</sub>+2H <sub><span style="font-family:宋體">2</span></sub>O+CO<sub><span style="font-family:宋體">2</span></sub><span style="font-family:宋體">↑ </span></p><p><span style="font-family:宋體"> 當藥劑投加量階躍變化時，電阻值的相應曲線如圖</span>6-19<span style="font-family:宋體">所示。該動態(tài)響應曲線說明控</span><span style="font-family:宋體">制對象的純滯后與慣性相當大，尤其是投加石灰乳的情況更加明顯。這一特征說明，如若采用通常的連續(xù)作用調節(jié)器</span>(PID)<span style="font-family:宋體">，往往出現較大的動態(tài)誤差，很難達到預期效果，必須采用步進式或搜索式控制規(guī)律。</span></p><p><span style="font-family:宋體"> 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