【摘要】：超臨界與超超臨界發(fā)電機組具有單位發(fā)電量所消耗的燃料少,發(fā)電效率高,自動化程度高,機組啟停迅速,可以實現(xiàn)滑壓運行等優(yōu)點,是一種節(jié)能、高效、清潔的發(fā)電機組,是未來發(fā)電機組發(fā)展的趨勢。在超臨界鍋爐投產(chǎn)后,有各種各樣的因素影響著鍋爐的安全運行,如爐內(nèi)溫度場、速度場分布不均勻,鍋爐水冷壁管內(nèi)工質(zhì)流動不穩(wěn)定,鍋爐受熱面水冷壁在制造安裝過程的疏忽大意等等,其中超臨界鍋爐水冷壁管內(nèi)工質(zhì)的流動特性對超臨界鍋爐受熱面水冷壁的安全運行至關(guān)重要。因此,對超臨界鍋爐水冷壁管內(nèi)工質(zhì)流動特性的研究具有極為重要的意義。本文以某電廠1900t/h超臨界W型火焰鍋爐為研究對象,以兩相流模型為基礎(chǔ),結(jié)合鍋爐機組水動力計算方法對鍋爐水冷壁管內(nèi)工質(zhì)的流動特性進行了計算和分析,并根據(jù)計算結(jié)果,從鍋爐水冷壁管內(nèi)工質(zhì)的流量補償特性等方面分析該鍋爐水冷壁管內(nèi)工質(zhì)在鍋爐給水質(zhì)量流量、水冷壁入口工質(zhì)溫度(入口工質(zhì)欠焓)、水冷壁熱負(fù)荷偏差對鍋爐水冷壁管內(nèi)工質(zhì)流動特性的影響。同時從鍋爐水冷壁管內(nèi)工質(zhì)的流動特性、鍋爐水冷壁管的管壁溫度、鍋爐水冷壁管所受應(yīng)力著手,對該電廠的1900t/h超臨界W型火焰鍋爐在實際生產(chǎn)運行中出現(xiàn)的一系列鍋爐水冷壁管變形及爆管情況進行原因分析,并對針對鍋爐水冷壁管變形和爆管的具體原因從鍋爐設(shè)備和鍋爐運行燃燒調(diào)整兩方面提出了相應(yīng)的改進措施。
[Abstract]:The supercritical and ultra supercritical power generation unit has the advantages of less fuel consumption, high efficiency, high automation, high efficiency, high automation, high efficiency and high efficiency. It is a kind of energy saving, efficient and clean generating set. It is the trend of the development of future generator set. After the supercritical boiler is put into operation, there are various kinds of reasons. It affects the safe operation of the boiler, such as the temperature field in the furnace, the uneven distribution of the velocity field, the unstable working fluid in the boiler water wall tube, the negligence of the water wall in the heating surface of the boiler, and so on, in which the flow characteristics of the working fluid in the water wall tube of the supercritical boiler operate safely to the water cold wall of the supercritical boiler heating surface. Therefore, it is of great significance to study the flow characteristics of the working fluid in the water wall tube of a supercritical boiler. This paper takes a 1900t/h supercritical W flame boiler of a power plant as the research object, based on the two phase flow model, and calculates the flow characteristics of the working fluid in the boiler water wall tube combined with the calculation method of the boiler unit's hydrodynamic force. And according to the analysis, and according to the calculation results, the effect of the quality flow of the boiler water cooling pipe in the boiler water cooling pipe in the boiler water supply quality flow, the inlet working quality of the water wall inlet and the heat load deviation of the water cooling wall on the flow characteristics in the boiler water wall tube. The flow characteristics of the working fluid in the cold wall pipe, the wall temperature of the boiler water wall tube and the stress of the boiler water wall tube are analyzed. The causes of the deformation of the water wall tube and the tube explosion of the 1900t/h supercritical W flame boiler in the power plant in the actual production operation are analyzed, and the deformation and tube of the water cold wall tube of the boiler are also analyzed. The corresponding reasons for improvement are put forward from two aspects: boiler equipment and boiler combustion adjustment.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM621.2
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本文編號：2120816