【摘要】：將塔式太陽能與燃煤電站互補發(fā)電,不僅能夠降低塔式太陽能熱發(fā)電的技術和經(jīng)濟風險[1,2],而且能夠降低太陽能發(fā)電成本,減少排放,促進可持續(xù)發(fā)展。本文對塔式太陽能與燃煤互補發(fā)電系統(tǒng)熱性能和經(jīng)濟性能作了相關研究,主要的研究成果與創(chuàng)新點概述如下:1)利用“錐體光學法”建立了塔式定日鏡場光學模型,基于放射狀柵格法建立了定日鏡場布置與優(yōu)化模型,并據(jù)此編寫了計算機模擬程序,此程序可以用于定日鏡場的設計計算及優(yōu)化;2)研究了不同吸熱器表面凈吸收能流密度條件下,吸熱器入口空氣流速和吸熱器表面積的取值范圍,為互補系統(tǒng)設計和運行提供了理論支撐;3)建立了塔式太陽能與燃煤互補發(fā)電系統(tǒng)的熱力學及經(jīng)濟學模型,并對2種不同的煙氣熱量利用方案進行對比分析,結果表明,利用煙氣加熱給水以取代部分或全部2級高加抽汽為最優(yōu)方案;4)研究了吸熱器表面凈吸收能流密度和煙-水換熱器換熱面積對互補系統(tǒng)熱性能的影響,并對互補系統(tǒng)的年性能和經(jīng)濟性作了研究和分析,結果表明,當煙-水換熱器換熱面積為省煤器換熱面積的6倍時,平準化太陽能發(fā)電成本最低(0.1256$/k Wh),遠低于單純太陽能電站的平準化太陽能發(fā)電成本(0.1787$/k Wh)[3],與原燃煤機組相比,此時互補系統(tǒng)的的煤耗率下降了56.9 g/k Wh,年節(jié)煤量達到5.2x104 t。
[Abstract]:The complementary generation of tower solar energy and coal-fired power plant can not only reduce the technical and economic risk of tower solar thermal power generation, but also reduce the cost of solar power generation, reduce emissions and promote sustainable development. In this paper, the thermal performance and economic performance of the tower solar and coal-fired complementary power generation system are studied. The main research results and innovations are summarized as follows: 1) the optical model of the tower sun-fixed mirror field is established by using the "pyramidal optics method". Based on the radial grid method, the model of the helioscope field layout and optimization is established, and a computer simulation program is compiled, which can be used for the design calculation and optimization of the helioscope field. 2) the range of the inlet air velocity and the surface area of the absorber is studied under the condition of different absorber surface net absorption energy flow density, which provides the theoretical support for the design and operation of the complementary system. 3) the thermodynamic and economic models of tower solar and coal-fired complementary power generation system are established, and two different schemes of flue gas heat utilization are compared and analyzed. The results show that, The optimal scheme is to use flue gas to heat the feed water to replace some or all of the two-stage high steam extraction. 4) the effects of the net absorption energy flow density on the surface of the absorber and the heat transfer area of the flue-water heat exchanger on the thermal performance of the complementary system are studied, and the annual performance and economy of the complementary system are studied and analyzed. When the heat transfer area of smoke-water heat exchanger is 6 times of that of economizer, the cost of equalized solar power generation is the lowest (0.1256 Wh), / k Wh),). Compared with the original coal-fired units, the coal consumption rate of the complementary system is reduced by 56.9 g / k Wh, per year to 5.2x104 t, which is much lower than that of the pure solar power plants (0.1787 g / k Wh) [3], and compared with the original coal-fired units, the coal consumption rate of the complementary system is reduced by 56.9 g / k Wh, per year.
【學位授予單位】：華北電力大學(北京)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM61

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本文編號：2360295