洪慧　彭爍　徐超

摘 要：針對我國西北沙漠地區(qū)太陽能資源豐富但缺水嚴重的問題，提出了一種間冷回?zé)崽柲苋細廨啓C與卡林那相結(jié)合的聯(lián)合循環(huán)發(fā)電系統(tǒng)。通過“比較法”，推導(dǎo)出太陽能熱發(fā)電效率簡明解析式?；谀艿钠肺桓拍睿捎肊UD圖像分析方法，探討了新循環(huán)各個子過程的不可逆損失，指出了不可逆損失分布特征和太陽能熱發(fā)電效率提高的潛力。通過分析關(guān)鍵參數(shù)對熱力性能的影響，揭示了這種太陽能聯(lián)合循環(huán)的熱力特性規(guī)律。另外，針對傳統(tǒng)太陽能熱發(fā)電系統(tǒng)在低輻照時不發(fā)電的現(xiàn)狀，提出了一種由太陽能燃氣輪機循環(huán)、朗肯循環(huán)、卡林那循環(huán)組成的聯(lián)合循環(huán)發(fā)電系統(tǒng)，并提出了一種新的運行調(diào)變策略，根據(jù)太陽輻照強度的變化切換系統(tǒng)流程，從而實現(xiàn)低輻照發(fā)電。以新疆地區(qū)的氣象條件為例，研究了系統(tǒng)四季典型日的變輻照運行性能。

關(guān)鍵詞：太陽能熱發(fā)電 熱力循環(huán) 卡琳娜循環(huán)

Abstract：In order to conserve water for solar thermal power plants in arid area， a new solar tower thermal power system integrating the intercooled gas turbine top cycle and the Kalina bottoming cycle is proposed. The thermodynamic performance of the proposed system is investigated， and the irreversibility of energy conversion is disclosed using the energy-utilization diagram method. A concise analytical formula of solar-to-electric efficiency of the proposed system is developed. As a result， the peak solar-to-electric efficiency of the proposed system is 27.5% at a gas turbine inlet temperature of 1000 °C under the designed solar direct normal irradiance of 800 W/m2. Compared with a conventional solar power tower plant， the proposed integrated system conserves approximately 69% of consumed water. On the other hand， a new solar-driven triple cycle is proposed to allow power generation during low insolation periods. A new operational strategy was presented to generate electricity during low isolation period without the backup of fossil fuel. The off-design performance was investigated and the irreversibility was disclosed with the aid of the energy-utilization diagram method. Thus， the proposed system can utilize low isolation to generate electricity.

Key Words：Concentrating solar power；Power cycle；Kalina cycle

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