本文關鍵詞：無煙煤混煤煤粉燃燒器的設計及數(shù)值仿真分析　出處：《集美大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 工業(yè)鍋爐 新型旋流濃淡煤粉燃燒器 超細煤粉 混煤 數(shù)值仿真

【摘要】：針對福建無煙煤極難燃的問題,本文結合旋流燃燒器的運行優(yōu)點和超細煤粉良好燃燒效果,利用優(yōu)質煙煤高效的助燃煤粉特性,開發(fā)出一種煙煤助燃超細無煙煤的新燃燒器—新型旋流濃淡煤粉燃燒器(New Type Bias Combustion Swirl Burner,簡稱(NTBCSB)),并對其燃燒特性進行了詳細的研究。新型旋流濃淡煤粉燃燒器充分考慮了影響煤粉著火和燃燒的煤粉氣流與高溫煙氣的迅速強烈混合問題:通過合理的配風和特殊的結構,從而實現(xiàn)了煙煤助燃無煙煤粉的效果。燃燒器一次風通道內(nèi)設置煤粉濃縮裝置,從而實現(xiàn)煤粉的濃淡燃燒;一次風管出口的縮口有利于提高出口煤粉的慣性動量,能夠使煤粉顆粒進入爐膛后即能進入回流區(qū),而不會過早地向二次風擴散;中等強度的旋流二次風能促進煙煤與無煙煤混合燃燒,并加強氣流擾動;三次直流風的補入能夠穩(wěn)定火焰,并降低火焰溫度,減少NOx的排放。對新型旋流濃淡煤粉燃燒器建立了三維數(shù)值計算模型,利用專業(yè)的計算流體力學軟件ANSYS CFX并對采用新型燃燒器的煤粉工業(yè)鍋爐爐膛燃燒室內(nèi)的氣固兩相流場、壓力場、溫度場和濃度場進行了模擬仿真。并對采用新型旋流濃淡煤粉燃燒器工業(yè)鍋爐爐膛燃燒室內(nèi)的回流區(qū)進行了立體分析;通過顆粒場模擬,分析了煤粉在噴出燃燒器后在爐膛燃燒室內(nèi)的分布和運動狀態(tài)。對采用新型旋流濃淡煤粉燃燒器與改進前的旋流燃燒器的工業(yè)鍋爐爐膛燃燒室分別進行單燒煙煤、超細無煙煤以及煙煤與超細無煙煤混煤三種工況的燃燒特性分析,仿真結果表明:該燃燒器具有良好的穩(wěn)燃性能,并且有效的降低NOx排放。
[Abstract]:In order to solve the problem of extremely difficult combustion of anthracite in Fujian province, combined with the operating advantages of swirl burner and the good combustion effect of superfine pulverized coal, the characteristics of high quality bituminous coal with high efficiency for combustion support are utilized in this paper. A new Type Bias Combustion Swirl Burner, a new type of swirl dense and light pulverized coal burner, has been developed for bituminous coal to support the combustion of ultrafine anthracite. Abbreviated as NTB CSB). The combustion characteristics are studied in detail. The new swirl dense and light pulverized coal burner takes into account the rapid and intense mixing of pulverized coal and high temperature flue gas which affects the ignition and combustion of pulverized coal. Through reasonable air distribution and special structure. In order to realize the effect of anthracite pulverized coal combustion supported by bituminous coal, a pulverized coal concentration device is installed in the primary air channel of the burner to realize the dense and light combustion of pulverized coal. The constriction of the outlet of the primary air duct is beneficial to improve the inertia momentum of the outlet pulverized coal, which can make the pulverized coal particles enter the backflow zone after entering the furnace, and not spread to the secondary air prematurely. The secondary wind energy with medium intensity swirl can promote the mixed combustion of bituminous coal and anthracite and enhance the disturbance of air flow. The recharge of the tertiary DC air can stabilize the flame, reduce the flame temperature and reduce the NOx emission. A three-dimensional numerical model for the new swirl thick-light pulverized coal burner is established. The gas-solid two-phase flow field and pressure field in the combustion chamber of pulverized coal fired industrial boiler with a new type burner are analyzed by using the professional computational fluid dynamics software ANSYS CFX. The temperature field and concentration field were simulated, and the reflux zone in the furnace combustion chamber of industrial boiler with a new swirl dense and light pulverized coal burner was analyzed. Through particle field simulation. The distribution and movement state of pulverized coal in the furnace combustion chamber after injection burner are analyzed. The single burning bituminous coal in the furnace combustion chamber of industrial boiler with new swirl dense and light pulverized coal burner and the improved swirl burner is carried out respectively. . The combustion characteristics of ultrafine anthracite and bituminous coal mixed with ultra-fine anthracite are analyzed. The simulation results show that the burner has good combustion stability and effectively reduces NOx emissions.
【學位授予單位】：集美大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TK223.23

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