外文翻譯---plc在蒸汽鍋爐汽包液位pid控制系統(tǒng)的應(yīng)用分析-wenkub.com
2025-01-14 23:35 本頁(yè)面
【正文】 考慮到該廢熱鍋爐控制參數(shù)耦合小，流程簡(jiǎn)單，產(chǎn)汽量也較穩(wěn)定，我們從操作人員的操作中得到啟發(fā)，認(rèn)為減少給水量的波動(dòng)從而穩(wěn)定給水溫度成為該廢熱鍋爐液位控制的要點(diǎn)。開(kāi)車正常后波動(dòng)范圍不大，可以不考慮。汽包液位測(cè)量選用浮筒液位計(jì)。鍋爐給水系統(tǒng)中還有一個(gè)比較重要的控制回路是給水壓力回路，因?yàn)槠鼉?nèi)壓力較高，要給鍋爐補(bǔ)水必須提供更高的壓力，給水壓力回路的作用是提高水壓，使水能夠正常注入汽包。若有一個(gè)或多個(gè)信號(hào)發(fā)生變化，平衡狀態(tài)被破壞，PI調(diào)節(jié)模塊的輸出必將發(fā)生變化。如果水位設(shè)定值為G，那么在平衡條件下應(yīng)有DDkWWk+HG=0的關(guān)系式存在。所謂三沖量調(diào)節(jié)系統(tǒng)就是把給水流量W，汽包水位H，蒸汽流量D三個(gè)變量通過(guò)運(yùn)算后調(diào)節(jié)給水閥的調(diào)節(jié)系統(tǒng)。造成這一原因是由于負(fù)荷增加時(shí)，導(dǎo)致汽包壓力下降，使汽包內(nèi)水的沸點(diǎn)溫度下降，水的沸騰突然加劇，形成大量汽泡，而使水位抬高。 3 控制難點(diǎn)分析 鍋爐計(jì)算機(jī)控制是近年來(lái)開(kāi)發(fā)的一項(xiàng)新技術(shù)。而利用余熱氣體作為熱交換介質(zhì)的余熱鍋爐在全國(guó)占有很大的比例，其節(jié)能降耗效果尤為明顯。為了確保鍋爐生產(chǎn)的穩(wěn)定、可靠和經(jīng)濟(jì)運(yùn)行，我們?cè)O(shè)計(jì)采用了性能先進(jìn)的永宏FBsPLC、變頻調(diào)速器、計(jì)算機(jī)應(yīng)用等自動(dòng)化設(shè)備組成的鍋爐PID自動(dòng)控制系統(tǒng)。5%. The PID adjustment steam outlet valve may the very good control dome pressure. After drives normally undulates the scope not to be big, may not consider. The transformed load undulation, the preheater boiler for the water temperature change, the boiler load undulation, dumps pollutants the quantitative change these factors to have to consider to the steam drum fluid position influence. Take the steam drum fluid position as the main tuning parameter, take gives the water current capacity as the vice accent parameter, take the steam current capacity as a forward feed, but the adjustment effect is very bad. Causes the steam drum fluid position major rises and falls. Considered this waste heat boiler controlled variable coupling small, flow simple, produces the steam quantity to be also stabler, we are inspired from in operator39。附錄2：外文翻譯PLC in steam boiler steam drum fluid position PID control system applied analysis 1 introductionThe industry steam boiler steam drum water monitor duty is the control causes it for the water current capacity with the transpiration rate maintenance dynamical equilibrium, maintains the steam drum water level in the craft permission scope, is guarantees the boiler safety in production movement the essential condition, also is one of boiler regular production movement major targets or quotas. If the water level excessively is high, affects the soft drink separation the effect, the use was mad the equipment breaks down。s operation, thinks the reduction thus to stabilize to the water volume undulation to the water temperature bees this waste heat boiler fluid position control the main point. There
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