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. 2023 Apr 14;8(16):14549-14557.
doi: 10.1021/acsomega.3c00233. eCollection 2023 Apr 25.

Study on Diesel Engine Selective Catalytic Reduction Performance at Different Atmospheric Pressures Using the Response Surface Method

Yuhua Bi  1 , Jie Yan  1 , Shaohua Liu  1 , Ben Xiao  1 , Lizhong Shen  1 , Peng Wang  1 , Xuexuan Nie  1
Affiliations

Study on Diesel Engine Selective Catalytic Reduction Performance at Different Atmospheric Pressures Using the Response Surface Method

Yuhua Bi et al. ACS Omega. .

Abstract

Nitrogen oxides (NO x ) are the main emissions of diesel engines. Selective catalytic reduction (SCR) is the main technology used to reduce NO x emissions from diesel engines. NO x conversion efficiency and ammonia (NH3) escape are the main indicators to evaluate SCR performance. In this work, the effects of diesel engine exhaust temperature and exhaust mass flow rate on the SCR performance under different atmospheric pressures were studied by the combination method of experiment and one-dimensional numerical simulation. At the same time, the response surface method (RSM) was used to analyze the interaction of atmospheric pressure, exhaust temperature, and exhaust mass flow rate on the SCR performance. The results show that the lower the atmospheric pressure, the lower the NO x conversion efficiency and ammonia escape. Under the same exhaust temperature, the lower the atmospheric pressure, the smaller the impact of exhaust mass flow rate on NO x conversion efficiency. According to the RSM results, the optimal NO x conversion efficiency is 78.6% under the combination working conditions of an atmospheric pressure of 100 kPa, exhaust temperature of 395 °C, and exhaust mass flow rate of 250 kg/h, and the NH3 escape is also at a low level of 1.7 g/cycle.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Illustration of the diesel engine SCR test bench.
Figure 2
Figure 2
Photos (a) diesel engine and (b) aftertreatment testing devices.
Figure 3
Figure 3
SCR 1D simulation model layout.
Figure 4
Figure 4
Comparison of NOx conversion efficiency between testing and simulation.
Figure 5
Figure 5
Comparison of NH3 escape between testing and simulation.
Figure 6
Figure 6
Impact of exhaust temperature on NOx conversion efficiency at different atmospheric pressures.
Figure 7
Figure 7
Impact of exhaust temperature on NH3 escape at different atmospheric pressures.
Figure 8
Figure 8
Impact of exhaust mass flow rate on NOx conversion efficiency at different atmospheric pressures.
Figure 9
Figure 9
Impact of exhaust mass flow rate on NH3 escape at different atmospheric pressures.
Figure 10
Figure 10
Comparison between calculated value and predictive value of the RSM model. (a) Comparison of calculated values and predicted values of NOx conversion efficiency. (b) Comparison of calculated values and predicted values of NH3 escape. (c) Comparison of calculated values and predicted values of exhaust O2 content.
Figure 11
Figure 11
Impacts of factor interactions on NOx conversion efficiency.
Figure 12
Figure 12
Impacts of factor interactions on NH3 escape rate.
Figure 13
Figure 13
Impacts of factor interactions on exhaust O2 content.
See this image and copyright information in PMC

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