【摘要】：在全球能源和煤炭日益減少的背景下,為滿足我國國民用電同時為經(jīng)濟(jì)的發(fā)展提供可靠的保障,發(fā)電廠的發(fā)電機組向著高參數(shù)、大容量的方向發(fā)展已經(jīng)勢在必行,而超臨界機組在現(xiàn)代火力發(fā)電機組中擔(dān)當(dāng)著國家能源電力穩(wěn)定的重任。在超臨界機組各子系統(tǒng)間的強耦合性和機組的蓄熱能力不強的雙重原因作用下,超臨界機組的給水由液態(tài)到汽態(tài)轉(zhuǎn)換時間很短,所以對給水系統(tǒng)的控制提出了更嚴(yán)格的標(biāo)準(zhǔn)。與傳統(tǒng)的汽包鍋爐相比,超臨界機組采用的直流鍋爐系統(tǒng)具有多變量、強耦合、非線性的特點,常規(guī)的控制方案已經(jīng)達(dá)不到運行要求,為使超臨界機組能夠長期優(yōu)良穩(wěn)定經(jīng)濟(jì)的運行,采用先進(jìn)的給水控制方案是必然的。本文結(jié)合寧夏京能寧東發(fā)電廠2×600MW超臨界機組的給水控制系統(tǒng)的設(shè)計特點,對超臨界機組給水系統(tǒng)的控制策略進(jìn)行了定性研究,并根據(jù)多年工作經(jīng)驗對超臨界機組給水系統(tǒng)的運行方式進(jìn)行了全面分析。本文提出了采用以煤水比為方向的給水控制,同時分析中間點溫度和中間點焓值兩種校正信號控制方式的優(yōu)缺點,并選擇適用寧夏京能寧東發(fā)電廠的給水量校正方式,在寧東電廠的運行環(huán)境中,選擇中間點焓值的自動給水控制是保證控制主蒸汽溫度的同時確保機組安全經(jīng)濟(jì)穩(wěn)定運行的最佳方式。本文的重點工作是分析直流鍋爐啟態(tài)和濕態(tài)運行階段的給水控制特點,提出運行的操作方式;其次,對直流工況下的給水控制邏輯進(jìn)行研究,并根據(jù)機組的實際情況對升降負(fù)荷進(jìn)行分析;最后對機組的重要輔機在突減負(fù)荷(RB)的工況下進(jìn)行試驗分析,并研究調(diào)節(jié)過程。
[Abstract]:Under the background of decreasing global energy and coal, in order to meet the demand of electricity and provide reliable guarantee for the development of economy, it is imperative for the generator set of power plant to develop in the direction of high parameter and large capacity. Supercritical units play an important role in national energy and power stability in modern thermal power generation units. Due to the strong coupling between subsystems of supercritical units and the weak heat storage capacity of supercritical units, the conversion time of feed water from liquid state to steam state is very short, so a more strict standard is put forward for the control of feed water system. Compared with the traditional drum boiler, the once-through boiler system used in the supercritical unit has the characteristics of multivariable, strong coupling and nonlinearity. In order to make the supercritical unit run steadily and economically for a long time, it is necessary to adopt advanced water supply control scheme. According to the design characteristics of feed water control system of 2 脳 600MW supercritical unit in Ningxia Jingneng Ningdong Power Plant, the control strategy of feed water system of supercritical unit is studied qualitatively in this paper. The operation mode of feed water system of supercritical unit is analyzed comprehensively according to the working experience of many years. In this paper, a feed water control system with coal-water ratio as the direction is proposed, and the advantages and disadvantages of two correction signal control methods, namely, the intermediate temperature and the enthalpy value of the intermediate point, are analyzed, and the water supply correction method suitable for Ningxia Jingneng Ningdong Power Plant is selected. In the operating environment of Ningdong Power Plant, it is the best way to control the main steam temperature and ensure the safe, economical and stable operation of the unit by selecting the automatic feed water control of enthalpy at the middle point. The main work of this paper is to analyze the characteristics of feedwater control in the stage of once-through boiler's start-up and wet operation, and to put forward the operation mode. Secondly, the logic of feed-water control under the direct current condition is studied. According to the actual situation of the unit, the lifting load is analyzed. Finally, the important auxiliary machine of the unit is tested and analyzed under the condition of sudden load reduction (RB), and the adjustment process is studied.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM621

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本文編號：2177491