沸石堆积高度对反应器蓄放热性能的影响

doi:10.16085/j.issn.1000-6613.2022-2108

摘要/Abstract

摘要：

吸附蓄热的储能密度高，热损失小，可实现太阳能等可再生能源的跨季节利用。然而，仍需要对吸附蓄热过程进行深入研究以提高反应器的蓄放热性能。本文搭建了吸附蓄热实验系统，并进行了多组蓄、放热实验。在不同堆积高度条件下，当反应器入口空气参数保持不变时，实测沸石13X的蓄放热性能显示：反应器输出温度是否存在稳定阶段与沸石快速吸附阶段时长相关，当反应器输出温度未出现稳定阶段时，快速吸附阶段时长小于反应器达到峰值输出温度的时长。随着沸石堆积高度的增加，沸石的储能密度保持不变，反应器的平均输出功率呈现出先逐渐增加而后趋于稳定的趋势。在吸附入口空气温度和湿度分别为22.0℃和14.9g/kg条件下，本实验中沸石的储能密度可达到220.9kWh/m³；相应地，当堆积高度大于1580mm时，吸附平衡过程中反应器的平均输出功率不再随堆积高度的增加而改变。

关键词: 沸石13X, 吸附, 蓄热, 堆积高度, 反应器

Abstract:

Sorption thermal energy storage has high energy storage density and low heat loss, which can realize the inter-seasonal utilization of renewable energy such as solar energy. However, it requires an in-depth investigation of the charging/discharging process to improve the thermal energy storage/release performance of the reactor. In this paper, a sorption thermal energy storage experimental system was built and several groups of charging and discharging experiments were conducted. When the inlet air parameters maintained to be constant, the thermal energy storage-release performances of zeolite 13X were measured under different packing height conditions. The experimental results show that whether there is a stabilization phase of the reactor output temperature or not is related to the duration of the fast sorption phase. When the reactor output temperature does not show a stable phase, the duration of the fast sorption phase is less than the duration for the reactor to reach the peak output temperature. With an increase of zeolite packing height, the energy storage density of the zeolite remains approximately unchanged, and the average output power of the reactor shows a trend of increasing gradually first and then stabilizing. When the inlet air temperature and specific humidity are 22.0℃ and 14.9g/kg, respectively, the energy storage density of zeolite in this experiment can reach 220.9kWh/m³. Correspondingly, when the stacking height is greater than 1580mm, the average output power of the reactor during the sorption equilibrium no longer changes with the increase of the stacking height.

Key words: zeolite 13X, sorption, thermal energy storage, packing height, reactor

中图分类号:

TK02

高士超, 王树刚, 胡沛裕, 赵一铭, 王继红, 孙毅, 蒋爽. 沸石堆积高度对反应器蓄放热性能的影响[J]. 化工进展, 2023, 42(10): 5092-5100.

GAO Shichao, WANG Shugang, HU Peiyu, ZHAO Yiming, WANG Jihong, SUN Yi, JIANG Shuang. Effect of zeolite packing height on thermal energy storage-release performance of reactor[J]. Chemical Industry and Engineering Progress, 2023, 42(10): 5092-5100.

图/表 10

图1 吸附蓄热工作示意图

图2 实验系统与设备示意图

表1 实验工况说明

序号	堆积高度 /mm	脱附温度 /℃	吸附温度 /℃	吸附含湿量 /g·kg^-1	吸附流速 /m·s^-1
1	60	142.2	21.8	14.8	0.292
2	80	142.8	22.1	15.1	0.295
3	100	143.5	21.9	15.0	0.289
4	120	142.3	22.0	14.9	0.291
5	140	143.9	21.9	15.0	0.291

表2 实验仪表精度

传感器	精度
Pt100热电阻	±0.1℃
湿度传感器	±0.26g/kg
流量计	±0.1m³/h
电子天平	±0.01g

图3 蓄热过程中的温度曲线

图4 吸附过程中反应器出口空气温度与吸附速率变化

图5 不同堆积高度下反应器出口空气温度

图6 不同堆积高度下沸石的吸附量

图7 堆积高度与吸附时长关系

图8 蓄热性能

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