Sub-23 nm Solid Particle Number Emission Characteristics for a Heavy-duty Engine Fuelled with Compression Natural Gas

Xiaowei Wang,Xiaojun Jing,Mingda Wang,Xuejing Gu,Lin Zhang,Z Tan,L Liu

doi:10.1051/e3sconf/202132901012

Abstract

Cold and hot WHTC (World harmonized Transient-State Cycle) were separately run on the engine test bed for a heavy-duty natural gas engine fuelled with high calorific value natural gas and low calorific value natural gas. The particle emissions including PN10 (number of particles above 10nm) and PN23 (number of particles above 23nm) were measured. The results show that the transient emission of PN10 and PN23 have basically the same trends. The weighted specific emission of PN10 is 21.6 times of PN23. Cold start PN emissions account for a relatively large proportion. Fuel property has a great influence on the PN emissions of natural gas engines. The increase of carbon-containing fuels such as methane and ethane in the fuel gas will lead to a rapid increase in PN emissions especially in the cold start process. It is extremely important to strengthen the control of sub-23nm particulate emissions for heavy-duty natural gas engines.

Highlights

According to the "China Mobile Source Environmental Management Annual Report (2021)" released by the Ministry of Ecology and Environment [1], China's motor vehicle particulate matter emissions will reach 68,000 tons in 2020, of which diesel vehicle particulate matter emissions account for more than 90%
The heavy-duty natural gas engine was run in cold and hot WHTC, and the results showed that: 1) For heavy-duty natural gas engines, the emissions of PN10 are much higher than those of PN23
It is necessary to strengthen the control of the sub23 nm PN emissions of natural gas engines

Summary

Introduction

According to the "China Mobile Source Environmental Management Annual Report (2021)" released by the Ministry of Ecology and Environment [1], China's motor vehicle particulate matter emissions will reach 68,000 tons in 2020, of which diesel vehicle particulate matter emissions account for more than 90%. The emission of particulate matter is harmful to the environment and human health. Compared with atmospheric particulate matter with larger particle size, the particulate matter emitted by motor vehicles has a small particle size with a long residence time in the atmosphere and a long transportation distance. The regulation of "Limits and Measurement Methods for Pollutant Emissions from Heavy Duty Diesel Vehicles (China's Sixth Phase)" [4] sets limitation on particulate matter quality, and requires to count the particle number with a particle size between 23nm-2.5μm (PN emission).

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Results

Conclusion