本文選題：鍋爐　切入點(diǎn)：空氣分級　出處：《華北電力大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：在日益嚴(yán)格的環(huán)保標(biāo)準(zhǔn)下,火力發(fā)電廠采用新技術(shù)來降低NOx的排放已迫在眉睫。結(jié)合某電廠#3機(jī)組的實(shí)際特點(diǎn),在雙尺度低NOx燃燒技術(shù)基礎(chǔ)上,通過在主燃區(qū)中引入節(jié)點(diǎn)功能區(qū),運(yùn)用貼壁技術(shù)和濃淡煤粉燃燒器,將相鄰的2層一次風(fēng)噴口的下層改為為上濃下淡煤粉噴口,將上層改為下濃上淡煤粉噴口,并且設(shè)置一次風(fēng)與2層一次風(fēng)噴口之間的二次風(fēng)小角度偏置,同時將貼壁風(fēng)布置在在中間二次風(fēng)兩側(cè)、優(yōu)化主燃燒器區(qū)的過量空氣系數(shù)為0.75~0.80、壓縮主燃區(qū)高度1860mm、增加7層分離燃盡風(fēng)噴口,使其分配35%~40%的SOFA燃盡風(fēng)量,形成高達(dá)10m的超大的還原區(qū)等優(yōu)化設(shè)計(jì)方案、過程中實(shí)現(xiàn)精密的安裝質(zhì)量控制、以及通過制粉系統(tǒng)和輔助風(fēng)系統(tǒng)等熱態(tài)綜合調(diào)試和優(yōu)化,啟動后鍋爐實(shí)現(xiàn)了結(jié)渣程度明顯減輕、燃燒高效安全、爐膛出口NOx排放濃度大輻降低的良好效果,并借助調(diào)試后獲得的鍋爐燃燒特性曲線固化至DCS自動控制系統(tǒng)中,通過DCS自動和運(yùn)行人員根據(jù)煤種、環(huán)境溫度等實(shí)際條件微調(diào)相結(jié)合的方式,實(shí)現(xiàn)了機(jī)組長周期、安全、穩(wěn)定運(yùn)行。通過技術(shù)研究與工程實(shí)踐,該電廠3號爐的機(jī)組負(fù)荷在50%~100%的范圍內(nèi),都能實(shí)現(xiàn)SCR入口處的NOx排放濃度在100mg/Nm~3左右;在550MW左右的機(jī)組負(fù)荷,NOx排放最低甚至可達(dá)到90 mg/Nm~3左右的水平,達(dá)到國際領(lǐng)先水平,同時鍋爐效率沒有明顯變化,機(jī)組的安全可靠性可以保證,實(shí)現(xiàn)了純神華煤連續(xù)滿負(fù)荷運(yùn)行,實(shí)現(xiàn)了預(yù)期的目標(biāo)。
[Abstract]:Under the increasingly stringent environmental protection standards, it is extremely urgent for thermal power plants to adopt new technologies to reduce NOx emissions. Considering the actual characteristics of #3 units in a power plant, based on the dual-scale low NOx combustion technology, By introducing the node function zone into the main combustion zone, using the wall sticking technique and the thickening pulverized coal burner, the lower layer of the adjacent primary air nozzle is changed to the upper thick and the lower light pulverized coal jet, and the upper layer is changed to the lower concentration and the lower light pulverized coal jet. At the same time, the secondary air between the primary air and the secondary air nozzle on the second floor is biased at a small angle, and the wall adhering air is arranged on both sides of the middle secondary air. The excess air coefficient of the main burner is 0.75 ~ 0.80, the height of the compression main combustion zone is 1860 mm, and the seven separate exhaust air vents are added to distribute 35% of the SOFA exhausted air volume and form a super large reduction zone of 10 m. In the process, the precision installation quality control is realized, and through the comprehensive debugging and optimization of the pulverizing system and the auxiliary air system, the slagging degree of the boiler after startup is obviously reduced, and the combustion is efficient and safe. The good effect of decreasing NOx emission concentration at furnace outlet is good, and the combustion characteristic curve of boiler obtained after debugging is solidified into DCS automatic control system. Through DCS automatic and operation personnel according to the coal type, the combustion characteristic curve of boiler is solidified into the DCS automatic control system. The long period, safe and stable operation of the unit has been realized by combining the environmental temperature and other practical conditions with fine adjustment. Through technical research and engineering practice, the unit load of the No. 3 boiler in the power plant is in the range of 50% or 100%. Both of them can realize that the NOx emission concentration at the entrance of SCR is about 100mg / Nmm3, and that the lowest or even the lowest emission of NOx at the 550MW unit can reach the level of 90 mg/Nm~3 or so, reaching the international leading level, while the boiler efficiency has not changed obviously. The safety and reliability of the unit can be guaranteed, realizing the continuous full load operation of pure Shenhua coal, and achieving the expected goal.
【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;X773

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本文編號：1568529