【摘要】：在常規(guī)燃煤電站機組中,一次風加熱流程和尾部煙道低溫煙氣換熱流程存在數量可觀的可用能損失和較大的優(yōu)化利用空間,為減小系統換熱過程的不可逆損失,該文提出基于一次風加熱流程優(yōu)化的高效集成系統,預干燥進入制粉系統的較高水分原煤,降低一次風的吸熱量,在此基礎上利用兩級蒸汽加熱器分級加熱一次風,同時優(yōu)化低溫煙氣換熱流程,回收低溫煙氣余熱,可大幅提高機組出功。該文以國內某典型1000MW超超臨界燃煤機組為案例,針對一次風加熱流程優(yōu)化的高效集成系統的換熱過程以及能量分配進行了熱力計算,并對系統做了技術經濟性分析。研究結果表明,原煤水分由18.1%干燥至8%的情況下,一次風流程-損失大幅下降,鍋爐有效利用熱量顯著提高,機組功率增加27.6MW,發(fā)電煤耗率降低6.7g/(k W·h),煙氣的酸露點溫度和空氣預熱器的換熱面積均有一定程度下降,機組運行經濟性與安全性均得到一定的提升,年增加凈收益可達1129.4萬元。
[Abstract]:In order to reduce the irreversible loss in the heat transfer process of the system, there is a considerable amount of available energy loss and a large optimal utilization space in the primary air heating process and the tail flue gas heat transfer process in conventional coal-fired power plant units. In this paper, a high efficient integrated system based on the optimization of primary air heating process is proposed to pre-dry the raw coal with higher moisture content into the pulverizing system to reduce the heat absorption of the primary air. On this basis, the two-stage steam heater is used to heat the primary air step by step. At the same time, optimizing the flow of low-temperature flue gas heat transfer and recovering the waste heat of low-temperature flue gas can greatly improve the generating power of the unit. Taking a typical 1000MW ultra-supercritical coal-fired unit as an example, the heat transfer process and energy distribution of a high-efficiency integrated system optimized by primary air heating process are calculated in this paper, and the technical and economic analysis of the system is made. The results show that when the moisture content of raw coal is increased from 18.1% to 8%, the primary air flow-loss is greatly reduced, and the effective heat utilization of the boiler is significantly increased. When the power of the unit is increased by 27.6 MW, the coal consumption rate of power generation reduces the acid dew point temperature of 6.7g/ (k W h), flue gas and the heat transfer area of air preheater to a certain extent, and the operation economy and safety of the unit are improved to a certain extent, and the annual net income can reach 11.294 million yuan.
【作者單位】： 電站設備狀態(tài)監(jiān)測與控制教育部重點實驗室(華北電力大學);
【基金】：國家重點基礎研究發(fā)展計劃(973)項目(2015CB251504) 國家自然科學基金(51476053) 中央高�；究蒲袠I(yè)務費專項基金(2015ZZD10)~~
【分類號】：TM621

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