提出了一个基于熔融盐循环热载体的无烟燃烧技术，即把一个燃烧过程分为氧化剂生成和燃料燃烧两个步骤进行，燃烧过程能使助燃空气中的N₂和燃烧产生的CO₂在一套反应装置中进行分离，得到较高纯度的N₂和CO₂，N₂可回收利用，CO₂则可捕集起来安全封存。整个燃烧过程避免了向大气排放有害气体；以CuO为催化剂，对CH₄在Li₂CO₃-K₂CO₃-Na₂SO₄熔盐体系中的熔融燃烧过程进行的试验研究结果表明，CH₄能在该熔融盐体系中能完成无烟燃烧过程并放出热，失去晶格氧的CuO能与空气反应重新恢复其晶格氧，气相色谱分析结果显示，理想的反应条件下, 得到的N₂的纯度为99.₃%以上，CO₂的纯度为95.1%以上。

A nonflame combustion technology using thermal cyclic carrier of molten salt introduced in this paper is developed based on the knowledge of energy chemistry, fuel cell and combustion. In this technology, a whole combustion is divided into two steps, i. e. section of producing oxide and section of combustion. In the first step, oxygen is separated form air, and pure N₂ is simultaneously left which is easily recovered. In the other step, fuels react with oxides formed in the first step, and at the same time, thermal energy, CO₂ and H₂O are produced. The CO₂ is easily separated from water vapour and captured. There are theoretically no environmentally-unfriendly gases such as CO₂，NO_x and S0₂ discharged in the whole combustion process. A typical nonflame combustion system using Li₂CO₃ + K₂CO₃ + Na₂SO₄ as molten salt system, CH₄ as fuel, CuO as catalyst was experimentally investigated. Experimental results show that the combustion process proceeded as theoretically analyzed, and high concentration CO₂ of 77.0%〜95.0% and N₂ of 91.9%〜99.₃% were obtained. The high concentration of CO₂ is favorable for capturing and storing subsequently. So, the potential of reducing CO₂ emissions of this nonflame combustion technology is huge.