【摘要】：燃氣-蒸汽聯(lián)合循環(huán)（簡稱CCPP）發(fā)電效率較高，而有機朗肯循環(huán)（簡稱ORC）可有效利用低品位熱能。而進行兩個循環(huán)耦合集成系統(tǒng)的研究，可進一步提升機組的發(fā)電功率和效率。 以北京太陽宮燃氣熱電有限公司（簡稱太陽宮電廠）350MWCCPP機組為例，基于梯級利用的方法，，提出了燃氣-蒸汽-有機工質(zhì)聯(lián)合循環(huán)（簡稱GSOPP）工藝方案。首先，在CCPP熱平衡和火用平衡模型的基礎(chǔ)上，對太陽宮CCPP機組進行了性能計算和火用損失分析；其次，篩選了6種有機工質(zhì)，并研究了有機工質(zhì)蒸發(fā)溫度、冷凝溫度、蒸發(fā)壓力和冷凝壓力對ORC性能的影響規(guī)律。最后，以太陽宮電廠CCPP機組的設(shè)計和運行工況參數(shù)為基礎(chǔ)，對GSOPP的抽汽和排煙兩種方案與太陽宮電廠原方案進行熱經(jīng)濟性對比分析，優(yōu)化了熱源參數(shù)。計算表明，依據(jù)正能量系數(shù)優(yōu)選了R141b工質(zhì)，在設(shè)計工況條件下抽汽和排煙兩種方案的發(fā)電功率比原工藝分別提高了14.76MW和6.37MW，發(fā)電效率分別提高了1.48%和0.47%。 研究表明，抽汽方案GSOPP機組有效地提升了CCPP機組的發(fā)電功率和發(fā)電效率，其研究結(jié)果可為發(fā)電機組提高效率和負荷提供思路和方案。
[Abstract]:Gas-steam combined cycle (CCPP) has high power generation efficiency, while organic Rankine cycle (ORC) can effectively utilize low grade heat energy. The power and efficiency of generating units can be further improved by the study of two cycle coupled integrated systems. Taking the 350MWCCPP unit of Beijing Yanggong Gas Thermal Power Plant as an example, based on the method of cascade utilization, the process scheme of gas-steam organic working fluid combined cycle (GSOPP) is put forward. Firstly, based on the models of CCPP heat balance and exergy equilibrium, the performance calculation and exergy loss analysis of the solar cell CCPP unit are carried out. Secondly, six kinds of organic working fluids are screened, and the evaporation temperature and condensation temperature of the organic working fluid are studied. The effect of evaporation pressure and condensation pressure on the performance of ORC. Finally, on the basis of the design and operating condition parameters of the CCPP unit in Yanggong Power Plant, the heat source parameters are optimized by comparing the two schemes of GSOPP steam extraction and smoke exhaust with the original scheme of the Sun Gong Power Plant. The calculation results show that according to the positive energy coefficient, the R141b working medium is selected, and the generating power of the two schemes under the design conditions is increased by 14.76MW and 6.37MW, respectively, and the generation efficiency is increased by 1.48% and 0.47%, respectively. The results show that the extraction scheme GSOPP unit can effectively improve the generating power and efficiency of the CCPP unit, and the research results can provide ideas and schemes for improving the efficiency and load of the generating unit.
【學(xué)位授予單位】：河北聯(lián)合大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM611.31

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