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  本文選題：球磨機　切入點：制粉系統(tǒng)　出處：《浙江大學(xué)》2014年碩士論文

【摘要】：電力工業(yè)是國民經(jīng)濟基礎(chǔ)產(chǎn)業(yè)為工業(yè)和國民經(jīng)濟其他部門提供基本動力,是國家經(jīng)濟發(fā)展中最重要的基礎(chǔ)能源產(chǎn)業(yè)。近年來,隨著電力行業(yè)的快速發(fā)展,電煤的需求急劇增加,受電煤價格等因素的影響,電煤供應(yīng)緊張,煤炭價格居高不下。國內(nèi)許多電廠紛紛開始選用價格較低但揮發(fā)份含量較高的煤,導(dǎo)致燃燒的電煤煤種達不到最初設(shè)計的要求,揮發(fā)份過高。由于難以保證燃燒設(shè)計的煤種,在燃用高揮發(fā)分煤種時,制粉系統(tǒng)運行時極易產(chǎn)生自燃、爆炸等隱患,嚴重時會導(dǎo)致設(shè)備損壞以至威脅人身安全。 本文針對中間儲倉式球磨機制粉系統(tǒng)出現(xiàn)的爆炸和自燃現(xiàn)象,以專業(yè)知識為指導(dǎo),通過查閱大量相關(guān)國內(nèi)外資料,詳細闡述制粉系統(tǒng)爆炸的機理,深入分析球磨機制粉系統(tǒng)爆炸事故的原因,總結(jié)了制粉系統(tǒng)相關(guān)設(shè)備和系統(tǒng)的防爆改造措施。 研究表明制粉系統(tǒng)爆炸事故主要原因在于煤和煤粉的積存以及球磨機出口溫度控制不當(dāng)?shù)惹闆r,針對目前運行中大多數(shù)電廠的中間儲倉式制粉系統(tǒng)的球磨機控制都比較落后的現(xiàn)象,提出用智能預(yù)測控制代替?zhèn)鹘y(tǒng)的PID控制,通過加強對球磨機出口溫度等的控制來降低球磨機制粉系統(tǒng)爆炸的可能性,加強制粉系統(tǒng)的安全運行。此外論文還綜述性地介紹了中儲式球磨機制粉控制系統(tǒng)的控制要求和控制難點、控制方法和存在問題以及建模特性等,并對制粉系統(tǒng)磨煤機進行模型預(yù)測控制與PID控制仿真和效果分析比較,證明模型預(yù)測控制相比于常規(guī)PID控制,球磨機出口溫度等參數(shù)的控制效果有明顯改善。這對進一步開展這方面的應(yīng)用和研究有一定的指導(dǎo)意義。
[Abstract]:The electric power industry is the basic industry of the national economy, which provides the basic power for the industry and other departments of the national economy, and is the most important basic energy industry in the national economic development. In recent years, with the rapid development of the electric power industry, the demand for thermal coal has increased sharply. Influenced by the price of thermal coal and other factors, the supply of electric coal is tight and the price of coal remains high. Many domestic power plants have begun to choose coal with lower price but higher volatile content, resulting in the burning of thermal coal falling short of the original design requirements. The volatile content is too high. Because it is difficult to ensure the combustion design of the coal, when burning the high volatile coal, it is easy to produce the hidden trouble such as spontaneous combustion, explosion and so on when the pulverizing system is operated, which will lead to the equipment damage and even threaten the personal safety seriously. According to the phenomena of explosion and spontaneous combustion in the pulverizing system of the intermediate storage type ball mill, the mechanism of the explosion of the pulverizing system is explained in detail by referring to a large number of relevant domestic and foreign data and guided by professional knowledge. The cause of explosion accident in pulverizing system of ball mill is analyzed in depth, and the measures of explosion proof and reformation of relevant equipment and system of pulverizing system are summarized. The research shows that the main causes of explosion accident of pulverizing system are the accumulation of coal and pulverized coal and improper temperature control at the outlet of ball mill. In view of the fact that the ball mill control of the middle storage pulverizing system in most power plants is backward at present, the intelligent predictive control is proposed to replace the traditional PID control. By strengthening the control of the outlet temperature of the ball mill to reduce the possibility of explosion in the pulverizing system of the ball mill, In addition, the paper also introduces the control requirements and control difficulties, control methods, existing problems and modeling characteristics of the pulverizing control system of the ball mill. The model predictive control of pulverized coal mill is simulated and compared with that of PID control. It is proved that the model predictive control is compared with the conventional PID control. The control effect of parameters such as outlet temperature of ball mill is obviously improved, which has certain guiding significance for further application and research in this field.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM621

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本文編號：1681570