热再生氨化学电池的实验研究及热力学分析

Experimental Study and Thermodynamic Analysis on Thermally Regenerative Ammonia Battery

热再生化学电池是一种利用低品位热能的新型途径,其中,热再生氨化学电池（TRAB）具有能量密度高的优势。为了提高电池容量,本文对电解液含0.1~3.5 mol/L Cu（NO3）2的TRAB进行了实验与理论研究。在常压、293.15~323.15 K温度范围内,实验测得TRAB阳极对Cu（NH3）4^（2＋）/Cu的温度系数为-0.879 mV/K,与理论计算值相差6.14%。进而对一个TRAB基本循环进行热力学分析,研究TRAB工作温度和再生温度的影响。当TRAB工作温度从293.15 K升至323.15 K时,放电效率从50.77%提高至54.91%;当再生温度为373.09 K、环境温度为303.15 K时,发电效率为0.49%,相应的循环热力学完善度为5.51%。

Thermally regenerative chemical battery is a new approach to utilize low grade thermal energy, in which the thermally regenerative ammonia battery （TRAB） has the advantage of high energy density. In this paper, in order to improve the battery capacity, the temperature coefficient of TRAB containing 0.1 -3.5 mol/L Cu（ NO3 ）2 in the electrolyte was obtained by experiments and theoretical calculation. In the temperature range of 293. 15 - 323. 15 K, the experimental temperature coefficient of anode （ Cu （ NH3 ） 42 ＋/Cu） was - 0. 879 mV/K, which deviated from theoretical value by 6.14%. Furthermore, thermodynamic analyses were carried out for a basic TRAB cycle, and the effects of TRAB working tem- perature and regeneration temperature were studied. When the battery working temperature rises from 293.15 K to 323.15 K,the discharge efficiency increases from 50.77% to 54.91%. The electricity gen- eration efficiency can reach 0.49% when the regeneration temperature is 373.09 K and the environment temperature is 303.15 K. Correspondingly, the degree of thermodynamic perfection is 5.51%.