外文翻譯---plc在蒸汽鍋爐汽包液位pid控制系統(tǒng)的應用分析-預覽頁
【正文】 tity and so on steam drum fluid position, in movement process entire automatic control, has guaranteed the industry boiler security stable highly effective movement.2 industries boilers related craft introductionThe steam boiler is the factories and mines important power equipment, its duty is the supplies qualified stable steam, satisfies the load the need. Therefore, boiler production process each main parameter all must strictly control. But holds the very great proportion using the afterheat gas as the heat change medium afterheat boiler in the nation, its energy conservation falls consumes the effect especially to be obvious. Some chemical plant sulfuric acid afterheat boiler is the furnace gas which es out using the ebullition stove (mainly is SO2) the hyperpyrexia, takes it as the heat change object, through afterheat boiler vice midproduction pressure steam for each production branch factory use, also has guaranteed the production need, also had achieved the energy conservation falls the goal which consumes. The boiler is a more plex controlled member, provides the qualified steam for the guarantee to meet the load need, if the necessary design control system must satisfy each main craft parameter the need. Afterheat boiler technical process like chart 1 shows:3 controls difficulties analysisThe boiler puter control is a new technology which the recent years developed. It is the microputer soft, the hardware, the automatic control, the boiler energy conservation and so on several technical in close integration with product, as the boiler control device, its primary mission is guaranteed the boiler the security, is stable, the economical movement, reduces operator39。若水位過高,影響汽水分離的效果,使用氣設備發(fā)生故障。2 工業(yè)鍋爐相關工藝介紹 蒸汽鍋爐是廠礦重要的動力設備，其任務是供給合格穩(wěn)定的蒸汽，以滿足負荷的需要。鍋爐是一個較為復雜的調節(jié)對象，為保證提供合格的蒸汽以適應負荷的需要，與其配套設計的控制系統(tǒng)必須滿足各主要工藝參數(shù)的需要。采用微計算機控制，能對鍋爐進行過程的自動檢測、自動控制等多項功能。它是以水位作為水量平衡與否的控制指標，通過調整進水量的多少來達到進出平衡，將汽包水位維持在汽水分離界面最大的汽包中位線附近，以提高鍋爐的蒸發(fā)效率，保證生產安全。 先通過蒸汽流量變送器和給水流量變送器取得各自的信號乘以相應的比例系數(shù)，通過比例系數(shù)可以調節(jié)蒸汽流量或給水流量對調節(jié)系統(tǒng)的影響力度。如果再設定時，保證在穩(wěn)態(tài)下DDk=WWk那么就可以得到H=G。反之，當水位降低時，調節(jié)模塊的輸出值增大，使給水閥開大。在老式的鍋爐系統(tǒng)中一般采用給水泵一直以工頻方式運轉，用回流閥降低水壓防止爆管，現(xiàn)在一般采用通過變頻器恒壓供水的方式控制水壓。5％。以汽包液位為主調參數(shù)、以給水流量為副調參數(shù)、以蒸汽流量為前饋，但調節(jié)效果很差。
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