鍋爐自動(dòng)給水外文翻譯--plc在蒸汽鍋爐汽包液位pid控制系統(tǒng)的應(yīng)用分析-plc設(shè)計(jì)-文庫(kù)吧
2025-04-16 14:39 本頁(yè)面
【正文】 現(xiàn)在一般采用的是臨界比例法。利用該方法進(jìn)行 PID 控制器參 數(shù)的整定步驟如下 : (1) 首先預(yù)選擇一個(gè)足夠短的采樣周期讓系統(tǒng)工作 。 (2) 僅加入比例控制環(huán)節(jié)，直到系統(tǒng)對(duì)輸入的階躍響應(yīng)出現(xiàn)臨界振蕩，記下這時(shí)的比例放大系數(shù)和臨界振蕩周期 。 (3) 在一定的控制度下通過(guò)公式計(jì)算得到 PID 控制器的參數(shù)。除此以外為保證鍋爐運(yùn)行的安全，在進(jìn)行自動(dòng)化控制系統(tǒng)設(shè)計(jì)時(shí)，對(duì)鍋爐水位、鍋爐汽包壓力等重要參數(shù)應(yīng)設(shè)置常規(guī)儀表及報(bào)警裝置，以保證水位和汽包壓力有雙重甚至三重報(bào)警裝置，這是必不可少的，以免鍋爐發(fā)生重大事故。 5 結(jié)束語(yǔ) 由于 采用了 PLC 進(jìn)行控制，系統(tǒng)功能完善，結(jié)構(gòu)先 進(jìn)合理，能耗小，擴(kuò)展靈活，便于維護(hù)，并且可靠性高，而且還極大地提高了企業(yè)的生產(chǎn)效率和經(jīng)濟(jì)效益。該系統(tǒng)自動(dòng)化程度較高，大大降低了操作者勞動(dòng)強(qiáng)度，降低了成本，經(jīng)過(guò)近 2 年的運(yùn)行，用戶給予了很高評(píng)價(jià)，認(rèn)為利用國(guó)產(chǎn)永宏 PLC 開(kāi)發(fā)的控制系統(tǒng)功能完善，綜合性強(qiáng)，人機(jī)界面友好，實(shí)用性好。隨著國(guó)產(chǎn)優(yōu)秀可編程控制器和高速計(jì)算元件的快速發(fā)展，鍋爐控制系統(tǒng)將會(huì)更加完善。 附件 2：外文原文 PLC in steam boiler steam drum fluid position PID control system applied analysis 1 introduction The 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。 But the water level excessively low can destroy the soft drink circulation, is serious when causes the explosion of a boiler, therefore the boiler steam drum water level must strictly control. In order to guarantee the boiler to produce stable, reliable and the economical movement, we designed use the performance to be advanced the boiler PID automatic control system which forever great automatic equipment and so on FBsPLC, frequency conversion velometer, puter application will pose. This control system through examination water vapor pressure, temperature, movement physical quantity 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 introduction The 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: Chart 1 afterheat boiler flow chart 3 controls difficulties analysis The 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。s labor intensity. Uses the micro puter control, can carry on the process to the boiler the automatic detection, the automatic control and so on many functions. It is adjusted the quantity is the steam drum water level, but adjusts the quantity is for the water current capacity, through to gives the water current capacity the adjustment, enables the steam drum interior the material to achieve the dynamical equilibrium, changes in the permission scope, although the boiler steam drum water level assumes the positive characteristic to the vapor current capacity and for the fluent quantity change response, but when load (vapor current capacity) sharp growth, performance actually similar counter response characteristic, namely socalled false water level. Creates this reason is because time load increase, causes the dome pressure to drop, causes the steam drum boiling temperature to drop, the water ebullition suddenly intensifies, forms the massive steam bubbles, but makes the water level to raise. The steam drum water monitor system, in the essence is maintains the boiler turnover water volume balance the system. It is by the water level took the water volume balance or not control target, through adjusts the water volume how many to achieve the turnover balance, maintains the steam drum water level in the soft drink separation contact surface biggest steam drum nearby the position line, enhances the boiler the vaporization effici
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