“鍋爐低溫?zé)煔庥酂嵘疃壤玫幕A(chǔ)研究”項(xiàng)目立項(xiàng)報(bào)告

徐進(jìn)良

摘 要：面向電站鍋爐及工業(yè)鍋爐煙氣余熱深度利用重大節(jié)能減排需求，開展低溫（<300℃）煙氣余熱深度利用重大基礎(chǔ)理論研究和關(guān)鍵技術(shù)攻關(guān)，對(duì)于節(jié)省化石能源消耗，提高燃料綜合利用效率，減少CO2及有害氣體SOx和NOx排放，節(jié)省水資源等極為重要。煙氣余熱深度利用是化石能源綠色利用的重要途徑。針對(duì)我國(guó)現(xiàn)有低溫?zé)煔庥酂崂眯实停杀靖撸狈τ行гu(píng)價(jià)方法，深度利用存在露點(diǎn)腐蝕等技術(shù)難題，融合能源、經(jīng)濟(jì)、材料等多學(xué)科交叉，從系統(tǒng)和部件層面凝練2個(gè)關(guān)鍵科學(xué)問題： （1） 能量利用效率-投資成本-運(yùn)行經(jīng)濟(jì)性熱經(jīng)濟(jì)學(xué)理論建立新型熱力學(xué)循環(huán)，發(fā)展逆向計(jì)算機(jī)輔助分子設(shè)計(jì)新方法，結(jié)合多目標(biāo)最優(yōu)控制理論，定量表征新的循環(huán)工質(zhì)應(yīng)具有的綜合優(yōu)良性能。建立熱力學(xué)不可逆性在部件間的優(yōu)化匹配原則，獲得利用效率和投資成本間的最佳平衡。拓展熱經(jīng)濟(jì)學(xué)理論，建立低品位余熱直接和間接利用系統(tǒng)的評(píng)價(jià)和熱學(xué)優(yōu)化的理論體系，建立全面考慮大規(guī)模煙氣余熱利用效率、投資成本和運(yùn)行經(jīng)濟(jì)性等多準(zhǔn)則的節(jié)能設(shè)計(jì)評(píng)價(jià)理論。（2）多相流動(dòng)結(jié)構(gòu)與能量傳遞及轉(zhuǎn)換的協(xié)同機(jī)理與調(diào)控原理 揭示多組分多相流動(dòng)結(jié)構(gòu)與能量傳遞及轉(zhuǎn)換的協(xié)同機(jī)制，建立數(shù)學(xué)模型。創(chuàng)新非能動(dòng)結(jié)構(gòu)設(shè)計(jì)，改善和控制流動(dòng)結(jié)構(gòu)，提高有利于能量傳遞與轉(zhuǎn)換所對(duì)應(yīng)流動(dòng)結(jié)構(gòu)的時(shí)空發(fā)生概率，提高部件性能。建立煙氣冷凝式換熱器、有機(jī)工質(zhì)液體分離式冷凝器、化學(xué)熱泵等設(shè)計(jì)理論和方法，建立并完善單螺桿膨脹機(jī)設(shè)計(jì)理論。該項(xiàng)目將突破煙氣余熱深度利用中的露點(diǎn)腐蝕等技術(shù)瓶頸，提出大型燃煤鍋爐煙氣余熱深度利用總體解決方案，發(fā)展新一代冷凝式省煤器等關(guān)鍵技術(shù)，在較低成本下使電站鍋爐效率提高1%～2%。發(fā)展新一代低溫?zé)煔庥酂嵊袡C(jī)朗肯循環(huán)熱功轉(zhuǎn)換系統(tǒng)，在較低成本下效率比國(guó)際現(xiàn)有技術(shù)提高20%，工業(yè)鍋爐燃料綜合利用效率提高5%～10%。圍繞2個(gè)關(guān)鍵科學(xué)問題，設(shè)置6個(gè)課題：（1）低品位能源利用熱力學(xué)基礎(chǔ)及評(píng)價(jià)；（2）煙氣介質(zhì)復(fù)雜熱質(zhì)傳遞與露點(diǎn)腐蝕機(jī)理及防治；（3）多組分有機(jī)工質(zhì)相變傳熱機(jī)理及設(shè)計(jì)優(yōu)化；（4）膨脹機(jī)中多組分多相流動(dòng)與全流膨脹機(jī)理；（5）低溫余熱品位提升及能量?jī)?chǔ)存；（6）余熱利用系統(tǒng)集成、控制及運(yùn)行。

關(guān)鍵詞：鍋爐 煙氣余熱 深度利用

Fundamental Research on Deep Utilization of Low Temperature Flue Gas Waste Heat of Boilers

Xu Jinliang

（North China Electric Power University）

Abstract：The deep utilization of the flue gas waste heat is one of the important ways to realize the green use of the fossil fuel. Driven by the low efficiency， high cost and material corrosion during the utilization， two key scientific issues are raised， from both the system and component levels：（1）Thermal economy theory for energy utilization efficiency-investment cost-operation economy It is necessary to establish the new thermodynamic cycle， develop the computer aided molecule design. With the help of the multi-objective optimization， physical properties of the new working fluids which have comprehensive better performance will be quantified. The matching principle of the thermodynamic non-reversibility in various components of the system will be established， to reach the optimization of the energy utilization efficiency and the investment cost. By expanding the classical thermal-economy theory， the evaluation and thermal optimization theory frame work for the direct and indirect low grade waste heat utilization will be established， the theory for the comprehensive consideration of the large-scale flue gas waste heat utilization efficiency， investment cost， and operation economy will be established.（2）The synergy principle and control scheme for the multiphase flow structure， energy transfer and conversion The synergy principle and energy transfer and conversion will be identified. The new passive structure design will be proposed， to improve and control the flow structure of multiphase fluids， increase the probability of the flow structures for the efficient energy transfer and conversion， thus to raise the component performance. The design theory and method for the flue gas condensation type heat exchanger， and liquid separation type condenser， and chemical heat pump etc. will be presented. The integrated solution scheme for the large-scale coal fired boiler of power plant will be proposed. The corresponding low pressure economizer technology will be developed. The boiler efficiency will be increased by 1～2 percent with low cost. The next generation Organic Rankle Cycle （ORC） system driven by the low grade waste heat of flue gas will be developed， with the energy conversion efficiency increased by 20% compared with the available technology over the world. The comprehensive fuel utilization efficiency of the industry boiler will be raised by 5%～10%.

Key Words：Boiler； Flue gas waste heat； Deep utilization

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