Study on Ship Exhaust Gas Denitrification Technology Based on Vapor-Phase Oxidation and Liquid-Phase Impingement Absorption
Abstract
:1. Introduction
2. Experimental
2.1. Materials
2.2. Experimental Method
3. Results and Discussion
3.1. Comparison of NO Removal Efficiency across Different Systems
3.2. Effect of (NH4)2S2O8 Concentration
3.3. Effect of Urea Concentration
3.4. Effect of Temperature
3.5. Effect of NU Solution Initial pH Value
3.6. Effect of NO Concentration
3.7. Effects of Impinging Stream Velocity
3.8. Analysis of Products in Solution
4. Conclusions
- (a)
- The NO removal efficiency improved with higher reaction temperatures and increased liquid–gas ratios. However, when the impinging stream velocity and pH value became too high, it instead reduced the removal efficiency of nitric oxide.
- (b)
- The addition of urea to the solutions effectively reduced nitrate levels and significantly improved NO removal efficiency under certain conditions.
- (c)
- The NO removal efficiency improved with increasing (NH4)2S2O8 concentration, provided that the urea concentration was fixed and the (NH4)2S2O8 concentration was below 0.05 mol/L.
- (d)
- NO removal efficiencies were nearly 97% at 1000 ppm, and the nitrate concentration was 7.53 mg/L at 343 K with 0.05 mol/L (NH4)2S2O8, 1.5 mol/L urea, and 15 m/s impinging stream velocity, which were the optimal results in this work.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Number | (NH4)2S2O8 (mol/L) | Urea (mol/L) | NH4+ (mg/L) | NO2− (mg/L) | NO3− (mg/L) |
---|---|---|---|---|---|
1 | 0.05 | 0 | 129.39 | 0.87 | 139.42 |
2 | 0 | 1.5 | 447.47 | 0 | 1.74 |
3 | 0.05 | 1.5 | 597.58 | 0 + 0.39 | 7.53 |
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Wang, Y.; Ma, W. Study on Ship Exhaust Gas Denitrification Technology Based on Vapor-Phase Oxidation and Liquid-Phase Impingement Absorption. Processes 2024, 12, 1798. https://doi.org/10.3390/pr12091798
Wang Y, Ma W. Study on Ship Exhaust Gas Denitrification Technology Based on Vapor-Phase Oxidation and Liquid-Phase Impingement Absorption. Processes. 2024; 12(9):1798. https://doi.org/10.3390/pr12091798
Chicago/Turabian StyleWang, Yuanqing, and Wenyao Ma. 2024. "Study on Ship Exhaust Gas Denitrification Technology Based on Vapor-Phase Oxidation and Liquid-Phase Impingement Absorption" Processes 12, no. 9: 1798. https://doi.org/10.3390/pr12091798