混合工质(R600/CO_2)的可燃性研究

Investigation on the Flammability of the Mixed Working Fluid(R600/CO_2)

为解决CO_2跨临界动力循环中,常规冷却水(30℃)难以冷凝亚临界CO_2的问题,可采用混合工质(R600/CO_2)提升循环工质临界温度.基于热通量法,研究不同配比下混合工质(R600/CO_2)燃烧特性,寻找混合工质燃烧临界配比。结果表明,随着混合工质中R600的增加,混合工质临界温度和循环热效率得到提高,当x_(R600)=6.78%时,R600/CO_2的临界温度约为40℃,可以实现常规冷却水循环;随着CO_2配比的增加,混合工质R600/CO_2的燃烧性明显降低,R600/CO_2的燃烧临界配比为0.04/0.96。

In order to solve the problem that it is difficult to condense subcritical CO2 in the CO2 transcritical power cycle by conventional cooling water(30℃). The critical temperature of working fluid can be enhanced by mixing R600 into CO2. Based on the heat flux method, the combustion characteristics of the mixture(R600/CO2) were investigated with different proportion. To find the critical proportion for the flammability. The results showed that with the increase of R600 proportion in the mixture, the critical temperature and the thermal efficiency of the mixture increased. When xR600=6.78%, the critical temperature of R600/CO2 is about 40℃, which makes the power cycle can run with conventional cooling water. With the addition of CO2, the flammability of the mixture R600/CO2 is obviously reduced. The value of 0.04/0.96 is the critical proportion for the flammability.