本文選題：余熱回收 + 朗肯循環(huán)　； 參考：《天津大學(xué)》2016年碩士論文

【摘要】：發(fā)動(dòng)機(jī)尾氣能量占燃料燃燒放熱總量的35%左右,采用朗肯循環(huán)系統(tǒng)回收尾氣能量,是實(shí)現(xiàn)發(fā)動(dòng)機(jī)節(jié)能的有效途徑。本文針對(duì)基于朗肯循環(huán)的汽油機(jī)尾氣余熱回收系統(tǒng)開(kāi)展了理論和實(shí)驗(yàn)研究。利用GT-Power建立了汽油機(jī)模型,對(duì)尾氣能量分布和余熱利用潛力進(jìn)行了分析,研究表明尾氣帶走的熱量與汽油機(jī)輸出功率相當(dāng),尾氣最大可利用率在46%以上,具有較大的回收潛力。利用汽油機(jī)模型模擬了尾氣背壓對(duì)汽油機(jī)功率的影響,以指導(dǎo)朗肯循環(huán)系統(tǒng)的設(shè)計(jì)。從系統(tǒng)回收效率以及設(shè)備小型化的角度考慮,選擇水為朗肯循環(huán)工質(zhì),并確定了評(píng)價(jià)系統(tǒng)性能的指標(biāo)。建立了單閥膨脹機(jī)Matlab/Simulink模型,對(duì)朗肯循環(huán)熱功轉(zhuǎn)化的核心部件單閥膨脹機(jī)進(jìn)行了熱力循環(huán)過(guò)程分析。分析了結(jié)構(gòu)參數(shù)(膨脹機(jī)的缸徑、行程和相對(duì)余隙容積系數(shù))、運(yùn)行參數(shù)(進(jìn)氣壓力、進(jìn)氣溫度和轉(zhuǎn)速)、以及配氣相位(進(jìn)氣閥升程和排氣口寬度和高度)對(duì)膨脹機(jī)的輸出功率、膨脹機(jī)效率、質(zhì)量流量的影響規(guī)律。搭建了朗肯循環(huán)余熱回收實(shí)驗(yàn)系統(tǒng),確定了實(shí)驗(yàn)的控制策略。完成了實(shí)驗(yàn)系統(tǒng)性能測(cè)試實(shí)驗(yàn),實(shí)驗(yàn)表明:在汽油機(jī)不同工況下,膨脹機(jī)轉(zhuǎn)速為1352r/min—1978r/min,輸出功率為2.06k W—3.47k W。當(dāng)汽油機(jī)在轉(zhuǎn)速為5500r/min,功率為76.6k W的穩(wěn)定工況下,膨脹機(jī)的最高壓力可以達(dá)到6.69MPa,膨脹機(jī)的指示功率可以達(dá)到5.06k W。朗肯循環(huán)的總效率在10%以上,使汽油機(jī)功率提高率最大達(dá)到5.8%。利用單閥膨脹機(jī)的升功率概念,從單位氣缸容積做功能力的角度,對(duì)膨脹機(jī)做出評(píng)價(jià)。單閥膨脹機(jī)的升功率達(dá)到35.3k W/L,滿足系統(tǒng)小型化的要求,具有良好的工程應(yīng)用前景。理論分析與實(shí)驗(yàn)結(jié)果表明單閥膨脹機(jī)由于體積小、結(jié)構(gòu)簡(jiǎn)單,適合小流量、小功率的場(chǎng)合,可以應(yīng)用到發(fā)動(dòng)機(jī)余熱回收朗肯循環(huán)系統(tǒng)。
[Abstract]:The engine tail gas energy accounts for about 35% of the total amount of fuel burning and exothermic. Using the Rankine cycle system to recover the energy of exhaust gas is an effective way to save energy of the engine. In this paper, a theoretical and experimental study is carried out on the exhaust heat recovery system of gasoline engine tail gas based on the Rankine cycle. A gasoline engine model is established by using GT-Power, and the energy of exhaust gas is divided. The utilization potential of cloth and waste heat is analyzed. The study shows that the heat from the tail gas is equal to the output power of the gasoline engine, the maximum utilization rate of the tail gas is above 46%, and it has a great recovery potential. The effect of the back pressure on the power of the gasoline engine is simulated by using the gasoline engine model, which means the design of the guide Rankine cycle system. As well as the miniaturization of the equipment, water is selected as the Rankine cycle working substance and the performance index of the system is determined. A single valve expander Matlab/Simulink model is established. The thermodynamic cycle process is analyzed for the single valve expander, the core component of the transformation of the Rankine cycle, and the structure parameters (the cylinder diameter, stroke and phase of the expander) are analyzed. For the clearance volume coefficient), the operating parameters (intake pressure, intake temperature and speed), and the effect of the gas phase (intake valve lift and outlet width and height) on the output power of the expander, the efficiency of the expander and the mass flow. A Rankine cycle waste heat recovery experiment system was set up, and the experimental control strategy was determined. The experiment was completed. The experiment of system performance test shows that the expansion speed of the expander is 1352r/min 1978r/min and the output power is 2.06k W to 3.47k W. at different working conditions of the gasoline engine. When the gasoline engine is 5500r/min and the power is 76.6k W, the maximum pressure of the expander can reach 6.69MPa. The indicator power of the expander can reach the 5.06k W. Lang. The total efficiency of the Ken cycle is above 10%, which makes the increase of the power of the gasoline engine maximum to reach the concept of 5.8%. using the lift power of the single valve expander. From the angle of the capacity of the unit cylinder volume, the expander is evaluated. The rise power of the single valve expander reaches 35.3k W/L, which meets the requirements of the miniaturization of the system, and has a good prospect of engineering application. The analysis and experimental results show that the single valve expander can be applied to the engine waste heat recovery Rankine cycle system because of its small volume, simple structure, suitable for small flow and small power.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TK115;TK411

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本文編號(hào)：1969177