本文選題：太陽能　切入點：輔助燃煤電站　出處：《華北電力大學》2014年碩士論文　論文類型：學位論文

【摘要】：太陽能輔助燃煤發(fā)電系統(tǒng)是將太陽能熱以不同方式與傳統(tǒng)燃煤機組相集成的系統(tǒng)。就目前特定形式而言,采用槽式太陽能熱發(fā)電系統(tǒng)輔助燃煤機組發(fā)電對太陽能熱利用及傳統(tǒng)燃煤機組節(jié)能是一種極為有效而合理的集成方式。為了深入研究集成系統(tǒng)的運行性能及優(yōu)化方案,本文將借助研究中所建立的660MW太陽能輔助燃煤發(fā)電系統(tǒng)變工況性能分析模型加以模擬分析,其具體研究內(nèi)容如下： 本文利用已有660MW燃煤機組及槽式太陽能集熱場數(shù)據(jù),在前人研究基礎之上,根據(jù)天文學、熱力學及熱經(jīng)濟學相關理論,對660MW太陽能輔助燃煤發(fā)電系統(tǒng)五種不同負荷工況(100%、85%、75%、50%及40%)分別進行了模型搭建。同時,本文還將太陽能貢獻度評價方法引入了模型之中,使其具備了對系統(tǒng)太陽能部分所占貢獻比例進行分析計算的能力。最后,通過應用Matlab軟件及其自帶的函數(shù)體系對研究中所搭建的一系列模型成功實現(xiàn)了對接,共同組成了一套完整的660MW太陽能輔助燃煤發(fā)電系統(tǒng)性能變工況性能分析模型。 通過利用所搭建的集成系統(tǒng)模型,文中對四個典型日(3月14日、6月25日、9月23日及12月21日)中集成系統(tǒng)各關鍵參數(shù)及運行性能進行了模擬分析。此外,根據(jù)研究地區(qū)典型年太陽輻照數(shù)據(jù)及燃煤機組運行數(shù)據(jù),文中還對集成系統(tǒng)設計值進行了初步選取,輻照設計值選為773W/m2,負荷設計值選為495MW(75%)。依據(jù)該設計值,文中對集成系統(tǒng)全年運行性能進行了模擬分析。 研究發(fā)現(xiàn),集成系統(tǒng)內(nèi)太陽能貢獻度并非隨有效直射輻射(DNIeff)的增大而持續(xù)上升；不同負荷下,當集熱場集熱量(Qcollected)超出其所對應的最優(yōu)集熱量(Qcolopt)時,由于系統(tǒng)內(nèi)太陽能側(cè)(?)損比例的上升,太陽能貢獻度呈現(xiàn)快速下降的趨勢�；诖�,文中提出了通過調(diào)節(jié)導熱油流速以維持集熱量處于最優(yōu)值范圍內(nèi),從而將太陽能貢獻度維持在較高水平的運行優(yōu)化方案。研究中選定某典型日午時為參考,將太陽有效直射輻射設定為由1-1150W/m2連續(xù)變化,并依此對五種負荷工況下的集成系統(tǒng)進行了模擬研究。結(jié)果表明,采用優(yōu)化方案后,集成系統(tǒng)的運行性能得到了較好的提升。 為進一步對集成系統(tǒng)運行優(yōu)化前后的經(jīng)濟性進行分析,文中依據(jù)槽式太陽能集熱場及660MW燃煤機組的各項經(jīng)濟性參數(shù),建立了集成系統(tǒng)標準煤耗率函數(shù)及發(fā)電收益函數(shù)。通過利用所建立的函數(shù),文中對四個典型日中,75%負荷下的集成系統(tǒng)采用運行優(yōu)化方案前后的經(jīng)濟性進行了分析計算,結(jié)果表明,優(yōu)化后的系統(tǒng)運行經(jīng)濟性明顯優(yōu)于優(yōu)化前。
[Abstract]:Ssceg system is a system of solar heat in different ways with the traditional coal-fired unit integration. The specific form, the solar thermal power system of power assisted coal-fired units of solar and conventional coal-fired unit energy saving is a very effective and reasonable way of integration. In order to run performance and Optimization for in-depth study of the integrated system, the performance of variable working condition analysis model simulation and analysis using 660MW ssceg system established in the study, the main research contents are as follows:
Based on the existing 660MW coal-fired unit and solar trough collector field data, based on previous studies, according to the relevant theories of astronomy, thermodynamics and thermo economics, on five different load conditions 660MW ssceg system (100%, 85%, 75%, 50% and 40%) were built. At the same time, this paper also the solar contribution degree evaluation method is introduced into the model, with the analysis and calculation of the proportion of the contribution ability of solar system. Finally, through the application of Matlab software and its function system comes with a series of model building studies successfully docking, compose a set of properties of 660MW solar aided coal-fired power system complete off-design performance analysis model.
By using the built model of integrated system, four typical day (March 14th, June 25th, in the September 23rd and December 21st) of the key parameters and operation performance of integrated system was simulated and analyzed. In addition, according to the research area of typical year solar radiation data and coal machine group operation data, the integrated value system design the preliminary selection, radiation design value is 773W/m2, the load design value is 495MW (75%). According to the design value, the annual performance of the integrated system are simulated and analyzed.
The study found that integrated system is not effective with the contribution of solar direct radiation (DNIeff) increased while rising; under different load, when the collector field in heat (Qcollected) beyond the optimal set of the corresponding heat (Qcolopt), the solar system side (?) increased loss ratio, the solar contribution the degree of declining quickly. Based on this, proposed by adjusting the flow rate to maintain a set of heat conduction oil in the optimal range, which will be maintained in the solar contribution operation optimization scheme of the high level. In the study selected a typical day at noon for reference, the effective solar direct radiation set continuous change by 1-1150W/m2 then, a simulation study of five kinds of integrated system load conditions. The results show that the optimization scheme, the operation performance of integrated system has been well improved.
For the further economy before and after the operation optimization of integrated system is analyzed, based on the groove type solar thermal parameters of the economic field and 660MW coal-fired unit, established the integrated system of standard coal consumption rate of power function and revenue function. By using the function established by the four typical day, integrated system 75% load the economy before and after the operation optimization scheme was analyzed, the results show that the optimization of economy of system operation is obviously better than the optimized.

【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM621

【參考文獻】

相關期刊論文 前1條

1 侯宏娟;高嵩;楊勇平;;槽式集熱場輔助燃煤機組回熱系統(tǒng)混合發(fā)電熱性能分析[J];太陽能學報;2011年12期

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本文編號：1584196