Influence of the Spacing of Steam-Injecting Pipes on the Energy Consumption and Soil Temperature Field for Clay-Loam Disinfection
Abstract
:1. Introduction
2. Theoretical analysis
3. Soil Steam Disinfection Test
3.1. Test Conditions and Materials
3.2. Test Methods
3.3. Data Analysis
4. Results and Analysis
4.1. Analysis of the Change in Soil Temperature
4.2. Soil Temperature Distribution Analysis
4.3. Soil Water Content Distribution Analysis
4.4. Soil Temperature Distribution Analysis
5. Discussion
6. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Nomenclature
ST | soil temperature (°C) |
SSD | soil steam disinfection |
SPS | steam pipe spacing (cm) |
SLD | soil layer depth (cm) |
qX | horizontal heat flux diffusion velocity (cm/s) |
qY | vertical heat flux diffusion velocity (cm/s) |
Xv | horizontal diffusion distance of the vapour (cm) |
Yv | vertical diffusion distance of the vapour (cm) |
Xh | horizontal heat transfer distance of the vapour (cm) |
Yh | vertical heat transfer distance of the vapour (cm) |
SWC | soil water content (%) |
Qs | total amount of steam (kg) |
Cv | coefficient of variation |
Vt | soil temperature rise rate (°C/s) |
Subscripts | |
X | horizontal direction |
Y | vertical direction |
v | vapour |
h | heat transfer |
s | steam |
t | temperature |
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Steam Temperature/°C | Steam Flow Rate/(kg/h) | Steam Enthalpy/(kJ/kg) | Heat of Evaporation/(kJ/kg) | Disinfection Time/min |
---|---|---|---|---|
120 | 2 | 2708.9 | 2332.09 | 56.3 |
120 | 3 | 2708.9 | 2332.09 | 37.6 |
120 | 4 | 2708.9 | 2332.09 | 28.2 |
140 | 2 | 2737.8 | 2360.99 | 55.6 |
140 | 3 | 2737.8 | 2360.99 | 37.1 |
140 | 4 | 2737.8 | 2360.99 | 27.8 |
160 | 2 | 2762.9 | 2386.09 | 55.1 |
160 | 3 | 2762.9 | 2386.09 | 36.7 |
160 | 4 | 2762.9 | 2386.09 | 27.5 |
Soil Types | Field Capacity/% | Bulk Density/ (g/cm3) | Soil Particle Compositions/% | ||
---|---|---|---|---|---|
Clay (<0.002 mm) | Silt (≥0.002–0.02 mm) | Sand (≥ 0.02–2 mm) | |||
Clay-loam | 32.3 | 1.15 | 53.3% | 23.3% | 23.3% |
Test Components | Manufacturer |
---|---|
LSS0.1-0.7-Y boiler | Jiangsu Yueheng Special Equipment Manufacturing Co., Ltd. |
LYK-10 boiler pressure controller | Changzhou Liping Electronic Equipment Co., Ltd. |
Y60 pressure gauge | Hongsheng Instrument Factory Co., Ltd. |
Q911F flow valve | Nanjing Meiyue Valve Co., Ltd. |
LUGB-20 flow meter | Nanjing Lantewan Electronic Technology Co., Ltd. |
ST-SWC control box | / |
two steam disinfection pipes | / |
soil bin (30 cm × 30 cm × 30 cm) | / |
DE-WEINI steam conveying pipe | Shanghai Jiyou Pipe Co., Ltd. |
SPS (cm) | Flow Rate (kg/h) | Time Ratio | Relative Energy Consumption kJ/(kg·°C) |
---|---|---|---|
12 | 4 | 0.637 ± 0.05d | 2.68 ± 0.20b |
6 | 0.565 ± 0.03e | 3.02 ± 0.18a | |
8 | 0.548 ± 0.05e | 3.13 ± 0.32a | |
18 | 4 | 0.857 ± 0.04ab | 1.99 ± 0.09cd |
6 | 0.798 ± 0.02bc | 2.13 ± 0.06cd | |
8 | 0.905 ± 0.06a | 1.89 ± 0.14d | |
24 | 4 | 0.781 ± 0.02bc | 2.18 ± 0.05cd |
6 | 0.774 ± 0.01c | 2.20 ± 0.03cd | |
8 | 0.794 ± 0.03bc | 2.15 ± 0.09cd | |
30 | 4 | 0.767 ± 0.01c | 2.22 ± 0.03c |
6 | 0.769 ± 0.02c | 2.21 ± 0.04c | |
8 | 0.772 ± 0.01c | 2.20 ± 0.03cd |
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Yang, Z.; Wang, X.; Ameen, M. Influence of the Spacing of Steam-Injecting Pipes on the Energy Consumption and Soil Temperature Field for Clay-Loam Disinfection. Energies 2019, 12, 3209. https://doi.org/10.3390/en12173209
Yang Z, Wang X, Ameen M. Influence of the Spacing of Steam-Injecting Pipes on the Energy Consumption and Soil Temperature Field for Clay-Loam Disinfection. Energies. 2019; 12(17):3209. https://doi.org/10.3390/en12173209
Chicago/Turabian StyleYang, Zhenjie, Xiaochan Wang, and Muhammad Ameen. 2019. "Influence of the Spacing of Steam-Injecting Pipes on the Energy Consumption and Soil Temperature Field for Clay-Loam Disinfection" Energies 12, no. 17: 3209. https://doi.org/10.3390/en12173209