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

【摘要】：電廠鍋爐一次風(fēng)在線監(jiān)測(cè)對(duì)鍋爐安全和經(jīng)濟(jì)運(yùn)行有著重要意義,但直吹式鍋爐一次風(fēng)由于攜帶大量煤粉,其風(fēng)速測(cè)量實(shí)際上是氣固兩相流測(cè)量問題。隨著氣固兩相流測(cè)量技術(shù)的發(fā)展,直吹式鍋爐一次風(fēng)速在線監(jiān)測(cè)技術(shù)難題也得到了不少的研究和應(yīng)用,但在實(shí)際應(yīng)用中各自有優(yōu)缺點(diǎn),本文旨在尋求一種方法簡(jiǎn)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(cè)量基本原理,提出鍋爐煤粉兩相流測(cè)量項(xiàng)目、參數(shù)范圍、環(huán)境條件等基本測(cè)量要求以及實(shí)現(xiàn)含粉氣體流速準(zhǔn)確測(cè)量的必要條件。在上述分析基礎(chǔ)上選擇采用傳統(tǒng)的單相流接觸式壓差法測(cè)量模型作為理論基礎(chǔ),對(duì)測(cè)量元件進(jìn)行清灰防堵結(jié)構(gòu)和防磨結(jié)構(gòu)的設(shè)計(jì)改造。通過風(fēng)洞試驗(yàn)分析風(fēng)速測(cè)量元件的各項(xiàng)特性指標(biāo),對(duì)測(cè)速元件和監(jiān)測(cè)系統(tǒng)結(jié)構(gòu)進(jìn)行改進(jìn),以使其適用于氣固兩相流速度測(cè)量,并應(yīng)用于直吹式制粉系統(tǒng)鍋爐一次風(fēng)速在線監(jiān)測(cè)中。通過在實(shí)際工業(yè)現(xiàn)場(chǎng)進(jìn)行的技術(shù)改造工程中加裝該測(cè)量元件,搭建在線監(jiān)測(cè)系統(tǒng),編制相應(yīng)的監(jiān)測(cè)系統(tǒng)軟件,實(shí)現(xiàn)直吹式制粉系統(tǒng)鍋爐一次風(fēng)噴口風(fēng)速數(shù)據(jù)的實(shí)時(shí)處理、顯示。在此基礎(chǔ)上,分別在鍋爐冷、熱態(tài)下進(jìn)行標(biāo)定和驗(yàn)證試驗(yàn),確定實(shí)際的使用效果,并對(duì)試驗(yàn)結(jié)果和問題進(jìn)行分析總結(jié)。最后對(duì)該課題的進(jìn)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(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM621.2

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本文編號(hào)：1834618