Effect of adsorption process intensification for high-temperature steam generation in adsorption heat pump

doi:10.11949/0438-1157.20190378

Abstract

Abstract:

In the open adsorption heat pump system based on direct contact heat transfer method, a pre-adsorption process or a preset mass transfer channel is introduced to investigate its influence on steam generation and system performance. In this paper, experimental working principle of high-temperature steam generation from hot water is described as a comparison. Then cyclic test with pre-adsorption units (saturation temperature=74.0℃ and 89.2℃) and mass transfer channels (branch shape and coiler shape) are conducted. The results show that after adding the pre-adsorption process(saturation temperature=89.2℃), the average temperature of the generated steam is 203 ?C and GTL (gross temperature lift) of the system is 98.4 ?C. Steam generation time was 131 s earlier than the comparative experiment, effective time ratio for steam generation is elevated by 52.2% and mass of generated steam is raised by 27.0%. COP_h (heating coefficient of performance) and SHP_s (specific heating power for steam generation)are improved by 28.2% and 27.2%, respectively. When presetting branch shape channel inside the adsorption bed, effective time ratio for steam generation is elevated by 17.8% and mass of generated steam is raised by 8.75%. COP_h and SHP_sare increased by 8.16%and 9.05%,respectively.The pre-adsorption process allows the adsorption bed to reach the entire adsorption and thermal equilibrium faster. As a result, the generated high temperature steam arrives the top exit earlier. Besides, the local adsorption equilibrium is promoted on account of the mass transfer channel, which also reduces the local mass transfer resistance and makes a part of generated steam leave the pocked bed quickly. These results indicate that with the rapidly achievement of the entire and local adsorption equilibrium, the dynamic steam generation process is successfully intensified and the system performance is significantly improved.

Key words: adsorption, pre-adsorption, mass transfer, equilibrium, high temperature steam

摘要：

在基于直接接触换热法的开式吸附热泵系统中，引入预吸附过程或预设传质通道，考察其对蒸汽生成和系统性能的影响。实验结果表明，预吸附蒸汽压力为0.0680 MPa(饱和温度=89.2℃)，系统生成高温蒸汽的平均温度为203℃，系统整体温升为98.4℃，相对于无预吸附系统，生成蒸汽的时间和质量分别增加52.2%和27.0%，系统制热系数和制热功率分别提升28.2%和27.2%。预置树枝状传质通道后，生成蒸汽的时间和质量分别增加了17.8%和8.75%，系统制热系数和制热功率分别提升8.16%和9.05%。预吸附过程使吸附床较快达到整体吸附和热力平衡，缩短蒸汽到达床层出口的时间。预吸附压力越高，系统到达整体吸附平衡的用时越短，蒸汽生成时间越早。传质通道促进吸附床局部平衡的达成，减小局部传质阻力，使部分蒸汽可迅速到达出口。整体和局部吸附平衡的快速达成，均强化了蒸汽的动态生成过程，提升系统整体性能。

关键词: 吸附, 预吸附, 传质, 平衡, 高温蒸汽

CLC Number:

TQ 083⁺.4

Linsheng ZHANG, Zhouming LIU, Guangyao LI, Tingting CHEN, Bing XUE. Effect of adsorption process intensification for high-temperature steam generation in adsorption heat pump[J]. CIESC Journal, 2019, 70(11): 4172-4180.

张林生, 刘周明, 李光耀, 陈婷婷, 薛冰. 吸附过程强化对提升高温热泵蒸汽生成性能的影响[J]. 化工学报, 2019, 70(11): 4172-4180.

Figures/Tables 11

Fig.1 Experimental setup illustration

Table 1 Detailed information for equipment and instruments

实验设备	型号	参数/精度
恒温水浴箱	LICHEN HH-420	420 mm $\times$ 180 mm $\times$ 160 mm
隔膜泵	CNP160608-13	0~10 L/h
真空泵	2XZ-4	4 L/s, 0.1 MPa~0.06 Pa
冷凝器	DLSB-5L/10	10~290 W/℃
热电偶	LED-KZ-K	0~800℃，±1.5℃
数据采集仪	midi LOGGER GL840	-100~1370℃，±0.8℃
电子天平	HENGBO30002	0~300 g，±0.01 g

Table 1 Detailed information for equipment and instruments

实验设备	型号	参数/精度
恒温水浴箱	LICHEN HH-420	420 mm $\times$ 180 mm $\times$ 160 mm
隔膜泵	CNP160608-13	0~10 L/h
真空泵	2XZ-4	4 L/s, 0.1 MPa~0.06 Pa
冷凝器	DLSB-5L/10	10~290 W/℃
热电偶	LED-KZ-K	0~800℃，±1.5℃
数据采集仪	midi LOGGER GL840	-100~1370℃，±0.8℃
电子天平	HENGBO30002	0~300 g，±0.01 g

Fig.2 Mass transfer channel and adsorption reactor with mass transfer channel

Table 2 Experimental operation conditions

实验分组		预吸附温度	传质通道
对比实验	DB	—	—
预吸附实验	YXF-1	74.0℃	—
预吸附实验	YXF-2	89.2℃	—
传质通道实验	SZ	—	树枝状通道
传质通道实验	PG	—	盘管状通道

Fig.3 Thermodynamic cycle of adsorption heat pump

Fig.4 Temperature and steam mass vs time during comparative experiment

Fig.5 Temperature and steam mass vs time during generation process with pre-adsorption

Fig.6 Temperature and steam mass vs time with branch shape channel

Fig.7 Temperature and steam mass vs time with coiler shape channel

Fig.8 Steam mass vs generalized time during generation process

Table 3 System performance parameters and deviations

Group	COP_h	GTL	SHP_s	E_m/%	E_Q/%
DB	0.100	97.0	0.0534	0.06	-4.8
YXF-1	0.119	98.9	0.0626	0.5	10.0
YXF-2	0.129	98.4	0.0679	-0.75	9.8
SZ	0.108	103.9	0.0582	-1.3	-6.2
PG	0.095	97.7	0.0500	2.6	-5.0

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