本文選題：火電廠　切入點：化學水　出處：《華北電力大學(北京)》2016年碩士論文

【摘要】：在火力發(fā)電機組的正常運行中,鍋爐起著很重要的作用,為防止自然水中的雜質(zhì)與離子引起鍋爐管壁的積鹽、腐蝕、結垢等,配置了化學車間對化學水進行凈化處理,同時隨著現(xiàn)在機組參數(shù)和容量的劇增,火電廠化學水處理設備發(fā)生了較大的變化,對化學水處理控制提出了更高的要求,因此良好的監(jiān)控系統(tǒng)既可以保證鍋爐補給水處理設備的正常運行,同時還能保證補給水的質(zhì)量,在火力發(fā)電機組的安全運行中進行實時性的監(jiān)控,避免出現(xiàn)不必要的經(jīng)濟損失�；瘜W水處理是火電廠正常運行開展的核心基礎,為了更好的提高火電廠日常安全運作,除鹽進水、超濾運行、反滲透出水、陰陽床及混床的進出水等每一步過程都需要化學水處理監(jiān)控系統(tǒng)的監(jiān)管和控制,本文以河北大唐國際豐潤熱電有限責任公司一期工程兩臺國產(chǎn)300MW亞臨界參數(shù)燃煤供熱機組為例,主要將PLC控制系統(tǒng)應用到火電廠鍋爐化學水處理系統(tǒng)中,該系統(tǒng)的設置結合了觸摸屏技術,對管網(wǎng)壓力有了更好的保護,延長了閥門的使用壽命,提高了火電廠化學水處理控制系統(tǒng)的優(yōu)化水平,對整個火電廠安全穩(wěn)定的運行也有著重大的意義。具體內(nèi)容如下：首先,提出本文選題的背景和意義,通過目前我國火電廠化學水處理監(jiān)控系統(tǒng)研究的現(xiàn)狀分析,指出化學水處理監(jiān)控系統(tǒng)目前的發(fā)展現(xiàn)狀和趨勢,分析出本文應用PLC監(jiān)控系統(tǒng)的可行性。其次,提出化學水處理監(jiān)控系統(tǒng)設計方案,這是本文研究的重點,包括PLC系統(tǒng)軟件、硬件平臺設計,PLC控制能夠進行自動監(jiān)控化學水的處理,從而促進化學水處理監(jiān)控系統(tǒng)的設計與實現(xiàn)。然后,設計了化學水流量自動調(diào)節(jié)系統(tǒng),通過先進的觸摸屏設計,使控制系統(tǒng)更加便捷操作,在實際運行中,化學水流量自動調(diào)節(jié)系統(tǒng)不僅提高了設備的安全可靠運行還節(jié)約了廠用電提高了電廠運行的經(jīng)濟性。最后,對火電廠PLC監(jiān)控系統(tǒng)在化學水處理系統(tǒng)中的應用做出總結,分析出本文研究的化學水處理PLC監(jiān)控系統(tǒng)在實際火電廠中的應用展望,對日后化學水處理PLC監(jiān)控系統(tǒng)的完善研究打下基礎。
[Abstract]:The boiler plays an important role in the normal operation of the thermal power generating set. In order to prevent the impurities and ions in the natural water from causing salt accumulation, corrosion and scaling of the boiler tube wall, a chemical workshop is configured to purify and treat the chemical water. At the same time, with the rapid increase of unit parameters and capacity, the chemical water treatment equipment of thermal power plant has undergone great changes, which puts forward higher requirements for chemical water treatment control. Therefore, a good monitoring system can not only guarantee the normal operation of boiler recharge water treatment equipment, but also guarantee the quality of recharge water. To avoid unnecessary economic losses, chemical water treatment is the core foundation for the normal operation of thermal power plants. In order to better improve the daily safe operation of thermal power plants, desalination influent, ultrafiltration operation and reverse osmosis effluent, The supervision and control of chemical water treatment monitoring system are needed in every step of the process of yin-yang bed and mixed bed. This paper takes two domestic 300MW subcritical parameter coal-fired heating units in the first phase project of Hebei Datang International Fengrun Thermal Power Co., Ltd as an example. The PLC control system is mainly applied to the chemical water treatment system of boiler in thermal power plant. The installation of the system combines the touch screen technology, which has better protection to the pipe network pressure and prolongs the service life of the valve. The optimization level of chemical water treatment control system in thermal power plant is improved, which is of great significance to the safe and stable operation of the whole thermal power plant. The specific contents are as follows: firstly, the background and significance of this paper are put forward. Based on the analysis of the current situation of chemical water treatment monitoring system in thermal power plants in China, this paper points out the current development and trend of chemical water treatment monitoring system, and analyzes the feasibility of applying PLC monitoring system in this paper. The design scheme of chemical water treatment monitoring system is put forward, which is the focus of this paper, including the design of PLC system software and hardware platform, which can automatically monitor the treatment of chemical water. So as to promote the design and realization of chemical water treatment monitoring system. Then, the automatic regulation system of chemical water flow is designed. Through the advanced touch screen design, the control system can be operated more conveniently and in actual operation. The automatic regulation system of chemical water flow not only improves the safe and reliable operation of the equipment, but also saves the power consumption and improves the economy of the power plant. Finally, the application of the PLC monitoring system in the chemical water treatment system of the thermal power plant is summarized. The application prospect of chemical water treatment PLC monitoring system studied in this paper in actual thermal power plant is analyzed, which will lay a foundation for the improvement of chemical water treatment PLC monitoring system in the future.
【學位授予單位】：華北電力大學(北京)
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM621.8;TP277

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