橢圓螺旋微管束反應器參數優化與性能評價

李珊珊; 張藍; 王玉琪; 王迪; 李海娣; 楊福勝; 吳震; 張早校

doi:10.13374/j.issn2095-9389.2019.05.014

橢圓螺旋微管束反應器參數優化與性能評價

doi: 10.13374/j.issn2095-9389.2019.05.014

1.
西北大學化工學院, 西安 710069
2.
西安交通大學化學工程與技術學院, 西安 710049

基金項目:

國家自然科學基金資助項目 21276209

陜西省自然科學基金資助項目 2017JM2033

化學工程聯合國家重點實驗室開放課題資助項目 SKL-ChE-18A02

詳細信息

通訊作者:
王玉琪, E-mail: wangyuqi@nwu.edu.cn

中圖分類號: O121.8;G558
計量
- 文章訪問數: 918
- HTML全文瀏覽量: 395
- PDF下載量: 15
- 被引次數: 0
出版歷程
- 收稿日期: 2018-04-09
- 刊出日期: 2019-05-01

Parameter optimization and performance evaluation of elliptical spiral mini-tube bundle reactor

1.
School of Chemical Engineering, Northwest University, Xi'an 710069, China
2.
School of Chemical Engineeringand Technology, Xi'an Jiaotong University, Xi'an 710049, China

More Information

Corresponding author: WANG Yu-qi, E-mail: wangyuqi@nwu.edu.cn

摘要

摘要: 為提高儲氫反應器的傳熱及吸放氫速率, 對現有金屬氫化物反應器進行了系統的綜合分析與評價.基于強化傳熱傳質特性, 設計優化出了一種高效的新型橢圓螺旋微管束反應器(ESMBR), 其具有結構緊湊、傳熱效果好、反應速度快及操作方便等特點.對研究的儲氫反應器進行了建模, 并通過實驗驗證了該模型的準確性和有效性.通過COMSOL軟件對比ESMBR、圓形螺旋微管束反應器(SMBR)和直管微管束反應器(MTBR)的數值模擬結果得出, ESMBR在儲氫時具有優異的傳熱傳質性能.進一步的敏感性分析結果表明, ESMBR中橢圓螺旋管結構參數的敏感性順序為主直徑(D_c) >橢圓截面長軸(A) >橢圓截面短軸(B) >節距(Pt) >螺旋角度(α).采用多元價值取向模型對不同的反應器方案進行了系統的分析評估, 結果表明: ESMBR的綜合優度高達0.845, 對比結果也明顯優于其他反應器, 在氫能領域將有廣闊的應用前景.
- 金屬氫化物 /
- 微管束 /
- 反應器 /
- 儲氫 /
- 多元價值取向模型
Abstract: Storage and transportation are one of the primary restrictions on the approach involving hydrogen energy. The traditional hydrogen storage methods, including high-pressure gas cylinder and cryogenic liquid tank show unfavorable economy, thus hindering their further industrial application and development. Metal hydrides can reversibly react with hydrogen and accomplish the hydriding/dehydriding process under mild operation conditions, which feature advantages such as large hydrogen storage amount, low operation pressure and energy consumption. This process is expected to replace the conventional hydrogen storage and transportation. Meanwhile, considering the strong endothermal/exothermic effect during hydrogenation/dehydrogenation, the prompt heat removal/support inside the metal hydride reactor is a key parameter for H₂ absorption/desorption rate and H₂ storage efficiency. To improve the heat transfer and absorption/desorption rates of metal hydride reactor, comprehensive analysis and evaluation were conducted. Based on the heat and mass transfer intensification, a new elliptical spiral mini-tube bundle reactor (ESMBR) with high efficiency was designed and proposed; the reactor possesses numerous features, such as high heat transfer speed, compact structure, high reaction rate, and convenient operation. All the hydrogen storage reactor models were established, and both the model accuracy and effectiveness were experimentally validated. Numerical simulations of ESMBR, spiral mini-tube bundle reactor, and mini-tube bundle reactor were calculated and compared by COMSOL. ESMBR was proven to exhibit favorable heat and mass transfer performance during the H₂ storage. Results of further analysis indicate that the sensitivity order of elliptical spiral structure parameters as follows: D_c > A > B > Pt > α. A multi-element valued model was used to evaluate the reactor schemes systematically, and the calculation results show the integrated superiority of ESMBR could achieve a value of 0.845. The comparison results indicate that the ESMBR presents an outstanding performance compared with other reactors and features a broad application prospect in the field of hydrogen energy.
- metal hydride /
- mini-tube bundle /
- reactor /
- hydrogen storage /
- multi-element value model

HTML全文

圖 1 MTBR使用前和使用后對比^[7]. (a) 使用前; (b) 使用后

Figure 1. Before and after using MTBR^[7]: (a) before; (b) after

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圖 2 反應器結構. (a) ESMBR結構；(b) 微管束3D結構

Figure 2. Structure of reactor: (a) structure of ESMBR; (b) 3D structure of mini-tube bundle

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圖 3 網格獨立性測試曲線

Figure 3. A grid independence test curve

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圖 4 模型方程驗證

Figure 4. Model equation verification

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圖 5 換熱管體積相同時MTBR、SMBR和ESMBR吸氫過程曲線

Figure 5. Hydrogen absorption process of MTBR, SMBR, and ESMBR with the same volume of heat exchange tubes

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圖 6 換熱管體積相同時MTBR、SMBR和ESMBR吸氫過程不同時刻床層平均溫度

Figure 6. Bed temperature at different times during hydrogen absorption process of MTBR, SMBR, and ESMBR with the same volume of heat exchange tubes

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圖 7 換熱面積相同時MTBR、SMBR和ESMBR吸氫過程曲線

Figure 7. Hydrogen absorption process of MTBR, SMBR, and ESMBR with the same area of heat exchange tubes

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圖 8 橢圓螺旋管結構

Figure 8. Spiral pipe structure

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圖 9 橢圓螺旋管結構參數敏感性分析. (a) 吸氫過程1000 s時床層平均溫度; (b) 吸氫過程反應分率從0.1~0.9所需時間

Figure 9. Sensitivity analysis of elliptical spiral tube structure parameters: (a) the average temperature of the bed during the hydrogen absorption process at 1000 s; (b) time required for reaction fraction from 0.1 to 0.9 during hydrogen absorption process

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圖 10 D_c，A，B，Pt改變時橢圓螺旋管在床層內的分布

Figure 10. Distribution of elliptical spiral tube in bed with changes of D_c, A, B, and Pt

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圖 11 D_c，A，B，Pt相同變化率時床層溫度分布

Figure 11. Distribution of bed temperature with same rate of changes of D_c, A, B, and Pt

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圖 12 不同螺旋角度α的橢圓螺旋管

Figure 12. Elliptical spiral tube with different spiral angles

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表 1 橢圓螺旋管結構參數值變化率

Table 1. Change rate of elliptical spiral tube structure parameter values

編號	參數值變化率/%
編號	D_c	Pt	A	B	α
實驗A	-40	40	-40	-40	-40
實驗B	-20	20	-20	-20	-20
實驗C	0	0	0	0	0
實驗D	20	-20	20	20	20
實驗E	40	-40	40	40	40

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表 2 橢圓螺旋管參數值變化率為實驗D時換熱面積的變化率

Table 2. Change rate of the heat transfer area with test D

參數	參數值變化率/%	換熱面積變化率/%
D_c	20	19.35
Pt	-20	24.21
A	20	15.56
B	20	4.44
α	20	0

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表 3 ESMBR的尺寸

Table 3. Size of ESMBR

外殼長度/mm	外殼直徑/mm	氫管直徑/mm	換熱管數	換熱管尺寸/mm				α/(°)
外殼長度/mm	外殼直徑/mm	氫管直徑/mm	換熱管數	Pt	D_c	A	B	α/(°)
150	50	6	4	6	5	2	1	90

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表 4 六種反應器的因素指標對比

Table 4. Comparison of the indicators of six reactors

方案	p₁	p₂	p₃	p₄	p₅	p₆
G₁	390.0	262.5	18.259	1.320	11.057	0.5
G₂	340.0	312.0	8.420	1.286	9.624	0.6
G₃	227.0	285.7	0.343	1.215	30.921	0.8
G₄	290.0	302.0	142.977	1.385	9.945	0.4
G₅	295.9	302.6	178.990	1.425	7.973	0.35
G₆	301.9	303.2	184.532	1.455	6.656	0.3

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表 5 因素指標重要程度的判斷值

Table 5. Judgment value of importance degree of factor index

因素p_i與p_j相比重要程度等級	f_{p_i}(p_j)	f_{p_j}(p_i)
同等重要	1	1
稍微重要	1	3
明顯重要	1	5
強烈重要	1	7

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表 6 綜合優度計算結果

Table 6. Comprehensive calculation results

方案	反應器類型	Z_j	結果
G₁	TR	0.704	Z₆>Z₅>Z₄>Z₃>Z₁>Z₂
G₂	DR	0.700
G₃	AR	0.755
G₄	MTBR	0.799
G₅	SMBR	0.831
G₆	ESMBR	0.845

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