【摘要】：在常規(guī)燃煤電站機(jī)組中,一次風(fēng)加熱流程和尾部煙道低溫?zé)煔鈸Q熱流程存在數(shù)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(tǒng)換熱過(guò)程的不可逆損失,該文提出基于一次風(fēng)加熱流程優(yōu)化的高效集成系統(tǒng),預(yù)干燥進(jìn)入制粉系統(tǒng)的較高水分原煤,降低一次風(fēng)的吸熱量,在此基礎(chǔ)上利用兩級(jí)蒸汽加熱器分級(jí)加熱一次風(fēng),同時(shí)優(yōu)化低溫?zé)煔鈸Q熱流程,回收低溫?zé)煔庥酂?可大幅提高機(jī)組出功。該文以國(guó)內(nèi)某典型1000MW超超臨界燃煤機(jī)組為案例,針對(duì)一次風(fēng)加熱流程優(yōu)化的高效集成系統(tǒng)的換熱過(guò)程以及能量分配進(jìn)行了熱力計(jì)算,并對(duì)系統(tǒng)做了技術(shù)經(jīng)濟(jì)性分析。研究結(jié)果表明,原煤水分由18.1%干燥至8%的情況下,一次風(fēng)流程-損失大幅下降,鍋爐有效利用熱量顯著提高,機(jī)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(diǎn)溫度和空氣預(yù)熱器的換熱面積均有一定程度下降,機(jī)組運(yùn)行經(jīng)濟(jì)性與安全性均得到一定的提升,年增加凈收益可達(dá)1129.4萬(wàn)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(shè)備狀態(tài)監(jiān)測(cè)與控制教育部重點(diǎn)實(shí)驗(yàn)室(華北電力大學(xué));
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973)項(xiàng)目(2015CB251504) 國(guó)家自然科學(xué)基金(51476053) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)基金(2015ZZD10)~~
【分類號(hào)】：TM621

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本文編號(hào)：2197873