太阳能热发电中氨基放热反应器的数值模拟

纯太阳能热发电作为一种能源清洁转换的有效方式越来越受到关注，而热化学储能问题的解决是保证纯太阳能热发电的稳定性和不间断性最关键的一环。文章分析了储能体系的选择，介绍了氨基热化学储能的基本原理, 在此基础上建立了放热反应器(氨合成反应器)的数学模型, 计算和绘制出了L(放热反应器长度)-T(反应温度)、T(反应温度)-y(氨摩尔分率)以及热量(Q)和佣(Enet)输出与反应器内壁平均温度(Tave)之间的关系曲线，直观地反映了在一定的设计压力和氢氮比条件下，进气温度和进气流率对放热反应的影响，给出了实现佣最优化和热能最优化的操作参数。模拟结果表明：反应器内催化床层的平均温度是实现佣和能量最优化的最优调节参数, 反应温度为850℃时输出最大佣, 反应温度为650℃时输出最大热能。

Numerical simulation of ammonia-based exothermic reactor used in solar-only thermal power generation

As an effective way for energy clear conversion, solar-only thermal power generation has aroused many people’s attention increasingly, while solution of energy storage is a key tache to guarantee the stability and continuity of solar thermal power generation. The choice of energy storage system is analysed, the basic principle of ammonia-based thermochemical energy storage is introduced. Based on this principle, the mathematical model of an exothermic reactor(ammonia synthesis reactor) is established to caculate Exothermic reator length L corresponding to reation temperature T, reation temperature T corresponding to ammonia mole fraction y and the average internal reactor wall temperature Tave corresponding to exergy output Enet and thermal power output Q. The curves of L-T, T-y, Q/Enet –Tave are drawn with the caculated date which can directly reflect the influence of reactor inlet gas temperature and reactant flow rate on ammonia synthesis reaction for the reactor under the conditions of definite design pressure and hydrogen/nitrogen ratio. Furthermore, the design parameters to realize maximum exergy output and thermal output are presented. The calculated results show that the average temperature of catalyst bed in reactor is the optimal control parameter to realize maximum exergy output and maximum thermal output. The maximum exergy output and maximum thermal output will reach under the condition of 850℃ and 650℃ respectively.