發(fā)布時間：2018-05-02 16:19

  本文選題：壓差法 + 直吹式鍋爐��； 參考：《天津大學》2014年碩士論文

【摘要】：電廠鍋爐一次風在線監(jiān)測對鍋爐安全和經濟運行有著重要意義,但直吹式鍋爐一次風由于攜帶大量煤粉,其風速測量實際上是氣固兩相流測量問題。隨著氣固兩相流測量技術的發(fā)展,直吹式鍋爐一次風速在線監(jiān)測技術難題也得到了不少的研究和應用,但在實際應用中各自有優(yōu)缺點,本文旨在尋求一種方法簡單但成熟可靠且直接精確的解決方案。本文通過研究分析基于壓差法的兩相流測量基本原理,提出鍋爐煤粉兩相流測量項目、參數(shù)范圍、環(huán)境條件等基本測量要求以及實現(xiàn)含粉氣體流速準確測量的必要條件。在上述分析基礎上選擇采用傳統(tǒng)的單相流接觸式壓差法測量模型作為理論基礎,對測量元件進行清灰防堵結構和防磨結構的設計改造。通過風洞試驗分析風速測量元件的各項特性指標,對測速元件和監(jiān)測系統(tǒng)結構進行改進,以使其適用于氣固兩相流速度測量,并應用于直吹式制粉系統(tǒng)鍋爐一次風速在線監(jiān)測中。通過在實際工業(yè)現(xiàn)場進行的技術改造工程中加裝該測量元件,搭建在線監(jiān)測系統(tǒng),編制相應的監(jiān)測系統(tǒng)軟件,實現(xiàn)直吹式制粉系統(tǒng)鍋爐一次風噴口風速數(shù)據的實時處理、顯示。在此基礎上,分別在鍋爐冷、熱態(tài)下進行標定和驗證試驗,確定實際的使用效果,并對試驗結果和問題進行分析總結。最后對該課題的進一步深化發(fā)展提出展望。
[Abstract]:On-line monitoring of boiler primary air in power plant is of great significance to boiler safety and economic operation, but the measurement of wind speed of direct-blown boiler is actually a problem of gas-solid two-phase flow because of carrying a large amount of pulverized coal. With the development of gas-solid two-phase flow measurement technology, the technical problems of on-line monitoring of primary wind speed of direct-blown boiler have been studied and applied, but they have their own advantages and disadvantages in practical application. The purpose of this paper is to find a simple, mature and accurate solution. By studying and analyzing the basic principle of two-phase flow measurement based on pressure difference method, this paper puts forward the basic measurement requirements of boiler pulverized coal two-phase flow, such as measurement items, parameter range and environmental conditions, as well as the necessary conditions for the accurate measurement of flow velocity of pulverized gas. On the basis of the above analysis, the traditional single-phase flow contact pressure difference measurement model is chosen as the theoretical basis to design and transform the ash cleaning and blocking structure and the anti-wear structure of the measuring elements. Through wind tunnel test, the characteristic indexes of wind speed measuring elements are analyzed, and the structure of velocity measuring elements and monitoring system are improved to make them suitable for the velocity measurement of gas-solid two-phase flow. It is applied to the on-line monitoring of the primary wind speed of the boiler in the direct pulverizing system. By installing the measuring element in the technical transformation project of the actual industrial field, setting up the on-line monitoring system and compiling the corresponding monitoring system software, the real-time processing of the wind speed data of the boiler primary air nozzle in the direct-blowing pulverizing system can be realized and displayed. On this basis, the calibration and verification tests were carried out under the cold and hot conditions of the boiler respectively, and the actual application results were determined, and the test results and problems were analyzed and summarized. Finally, the prospect of the further development of the subject is put forward.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM621.2

【參考文獻】

相關期刊論文 前10條

1 田紅彬;吉煒寰;;背靠管式差壓氣體流量計[J];儀表技術與傳感器;2013年06期

2 步士喜;汪波;曹德思;;一次風速測量裝置在145MW機組上的應用[J];電子測試;2013年05期

3 孫保民;趙勇綱;趙智勇;史忠權;;新型氣～固兩相流體平均流速測量儀的試驗研究[J];熱能動力工程;2012年06期

4 薛倩;王化祥;高振濤;;基于雙截面電容層析成像技術的兩相流速測量[J];中國電機工程學報;2012年32期

5 方立德;盧慶華;李小亭;張計科;何青;張W，

本文編號：1834618