Modelling and Analysis of Ammonia Sorption Reactions in Halide Salts
Modelling and Analysis of Ammonia Sorption Reactions in Halide Salts
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DOI：
10.1016/j.ijrefrig.2022.01.032
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发表时间：
2022-02
影响因子：
3.9
通讯作者：
S. Hinmers;G. Atkinson;R. E. Critoph;M. van der Pal
中科院分区：
文献类型：
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作者：
S. Hinmers;G. Atkinson;R. E. Critoph;M. van der Pal
这项工作的重点是开发一种准确的方法来测试和模拟氨盐吸附反应所涉及的反应动力学，这一点到目前为止还没有始终如一地实现。研制了一种用于在真实机器条件下测试氨-盐反应的大温度跳跃(LTJ)测试装置。研制了一种用于在真实机器条件下测试氨-盐反应的大温度跳跃(LTJ)测试装置。这被用来验证一种新的方法来模拟化学吸附机器的行为和性能。推导了热传导方程和热力学方程，并建立了有限差分模型，该模型已用于氨在多孔介质中吸附和脱附为卤化物盐的反应。该模型在一个MatLab®程序中实现。对氯化锰和氯化钡进行了大温度跳跃(LTJ)实验，以验证模型的有效性，并确定表征该吸附剂动态性能的物理参数。将氯化锰和氯化钡浸渍在膨胀天然石墨(ENG)(SGL SIGRATHERM®)板中。ENG板提供了可行的样品(31.5 mm外径1/2英寸管子)，在250秒内进行解吸反应，流体温度高于平衡温度15°C，比其他地方观察到的快了一个数量级。已经开发了一种新的测试方法，由于减少了滞后，因此能够准确地识别单次反应热，据报道，这种方法适用于氯化钡和氯化锰。利用径向换热两种几何构型的LTJ实验数据对该模型进行了验证：从外径加热/冷却的圆盘(“管侧”)和从内径加热的环空(“壳侧”)。获得的经验数据是盐发生器设计和优化的一个里程碑。
This work has focussed on the development of an accurate method for testing and modelling the reaction kinetics involved in ammonia-salt adsorption reactions, something not achieved consistently to date. A Large Temperature Jump (LTJ) test cell has been developed for testing ammonia-salt reactions in real machine conditions. A Large Temperature Jump (LTJ) test cell has been developed for testing ammonia-salt reactions in real machine conditions. This was used to validate a new approach to modelling the behaviour and simulate the performance of chemisorption machines. A derivation of the heat transfer and thermodynamic equations are presented, and a finite difference model described which has been validated for the adsorption and desorption reactions of ammonia into halide salts within a porous matrix. The model is implemented in a MATLAB® program. Large Temperature Jump (LTJ) tests have been conducted on manganese chloride and barium chloride to validate the model and to identify the physical parameters which characterise the dynamic performance of the sorbent. The manganese chloride and barium chloride were impregnated in expanded natural graphite (ENG) (SGL SIGRATHERM®) board. The ENG board gave rise to practicable samples (31.5 mm OD ø over ½” tube) undergoing a desorption reaction in under 250 seconds with the fluid temperature 15°C above the equilibrium temperature, an order of magnitude faster than observed elsewhere. A new test method has been developed enabling an accurate single heat of reaction to be identified due to reduced hysteresis, which is reported for barium and manganese chloride. The model has been validated using experimental data from LTJ tests of two geometric configurations in radial heat transfer: discs heated/cooled from the outside radius (‘tube-side’) and annuli heated from the inner radius (‘shell-side’). The empirical data obtained is a milestone towards designed and optimised salt generators.