本文關鍵詞：SCR脫硝裝置協(xié)調優(yōu)化研究　出處：《東北電力大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： SCR 導流板 NH_3/NO_X摩爾比 噴氨 優(yōu)化

【摘要】：煤燃燒過程中釋放的NO_X為環(huán)境的主要污染源,是引起人類健康和氣候惡化的罪魁禍首。通過有效高效的脫硝措施來降低NO_X的排放是國內大多數電廠的當務之急。反應器性能的最主要指標是脫硝效率及氨氣逃逸率,而反應器催化劑首層NO_X與NH3的混合比及速度分布的均勻化在一定程度上決定這個指標的好壞。脫硝反應器流場優(yōu)化和新型催化劑的研發(fā)是近些年來研究的熱門,脫硝效率提升、催化劑壽命延長更是重中之重。隨著CFD和計算機技術的高速發(fā)展,利用高效、便捷的GAMBIT與FLUENT軟件對SCR脫硝系統(tǒng)進行繪制和數值模擬,可以為脫硝反應器煙道、導流系統(tǒng)及噴氨系統(tǒng)的設計和改進提供重要依據。本文針對山東某電廠650MW燃煤機組SCR脫硝系統(tǒng)氨氣逃逸率較大,導致催化劑的堵塞、失活及中毒。通過FLUENT數值模擬建立三維脫硝系統(tǒng)模型,模擬了在反應器頂部不同導流板數量及噴氨速度下SCR系統(tǒng)流場分布,通過對結果的分析比較,得出適當增加導流板組數和合理差異化的調整各噴口噴氨速度能夠使第一層催化劑入口的NH3濃度、NO_X濃度及NH_3/NO_X分布更加均勻化合理化,很好的滿足了設計和運行的雙重檢測,為SCR脫硝系統(tǒng)的協(xié)調優(yōu)化和機組運行的穩(wěn)定性提供了實際參考價值。
[Abstract]:NO_X released during coal combustion is the main source of environmental pollution. It is urgent for most power plants to reduce the emission of NO_X through effective and efficient denitrification measures. The most important indexes of reactor performance are denitrification efficiency and denitrification efficiency. Ammonia escape rate. The mixing ratio of NO_X and NH3 and the homogeneity of velocity distribution in the first layer of reactor catalyst determine the quality of this index to some extent. The optimization of flow field in denitrification reactor and the research and development of new catalyst have been studied in recent years. It's hot. With the rapid development of CFD and computer technology, it is very important to improve the denitrification efficiency and prolong the catalyst life. Convenient GAMBIT and FLUENT software to draw and numerical simulation of SCR denitrification system can be used as flue of denitrification reactor. The design and improvement of diversion system and ammonia injection system provide important basis. The ammonia escape rate of SCR denitrification system of 650 MW coal-fired unit in Shandong Province is high, which leads to the blockage of catalyst. FLUENT numerical simulation was used to establish a three-dimensional denitrification system model, and the flow field distribution of SCR system was simulated under different number of diversion plates and ammonia injection rate at the top of the reactor. Through the analysis and comparison of the results, it is concluded that the NH3 concentration in the inlet of the first layer catalyst can be obtained by properly increasing the number of the guide plate groups and adjusting the ammonia injection speed of each nozzle reasonably. NO_X concentration and NH_3/NO_X distribution are more homogenized and rationalized, which satisfies the dual detection of design and operation. It provides practical reference value for the coordination optimization of SCR denitrification system and the stability of unit operation.
【學位授予單位】：東北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X773

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本文編號：1438050