Application of balance in measurement of diesel particulate matter
introduction
With the continuous advancement of emission regulations, the emission limits of diesel engines are becoming more and more strict. This puts higher requirements on the research and development of diesel, which requires the supply of a large number of reliable particle measurement data for research and development. The accuracy and reliability of the balance also raises higher requirements.
Apply Sartorius balances to meet regulatory requirements
The emission regulations of GB17691-2005 issued by China clearly stipulate the particulate matter emission limits of the national III, national IV and national V stages: the particulate matter limit of the steady state cyclic ESC (European Steady state Cycle) is 0.1g/kwh, 0.02 g/kwh, 0.02 g/kwh; the particulate matter limit of the transient cycle ETC (European Transient Cycle) is 0.16 g/kwh, 0.03 g/kwh, 0.03 g/kwh, respectively. As far as China's current national IV standard is implemented, the weight of particulate matter collected on the filter paper in the ETC cycle may be only a few hundred micrograms. Very small deviations will have a huge impact on the experimental results. Therefore, the measurement balance of the particulate matter should have Sufficient accuracy and resolution. In the regulations, there is also a clear requirement for weighing balances: “The analytical balance used to weigh all filter papers should have an accuracy of 20 μg (standard deviation) and a resolution of 10 μg (1 digit = 10 μg). 70mm filter paper, accuracy and resolution should be 2μg and 1μg respectively.†We chose the Sartorius filter balance, the balance resolution is 0.1μg, the accuracy is 0.252μg, its accuracy and resolution is much higher than At this stage, the National IV standard requires that this is to meet the higher requirements of the World Harmonized Transient Cycle (WHTC) and the WHC (World Harmonised Steady State Cycle). It should be noted that the particulate matter limit of WHTC and WHSC of Euro 6 is 0.01. g/kwh, which is one-third of the current ETC, half of the ESC, the high accuracy and high repeatability of the Sartorius balance, makes this demand satisfied.
Anti-static interference solution
The filter paper used in engine particulate matter discharge is a fluorocarbon coated glass fiber filter paper or a fluorocarbon-based membrane filter paper, which is prone to static electricity and has a large influence on the accuracy of the symmetry amount. In order to remove the interference of static electricity, Sartorius gave an excellent solution to ground the balance and cooperate with Sartorius in addition to the electrostatic pen (as shown in Figure 1), which greatly reduced the interference of static electricity. At the same time, the use of the electrostatic pen is also very simple and fast, does not require any complicated operation, greatly improving the efficiency of the work.
Sartorius in addition to electrostatic pen
Sartorius balance humanized design
The automatic calibration function isoCAL of the Sartorius balance ensures fast, accurate and convenient calibration of the balance. The entire calibration process is only a few minutes, which not only ensures the reliability of the data, but also greatly improves the efficiency of the work.
In order to meet the needs of research and development, the gantry conducts a large number of particulate matter discharge experiments every day. If all the particle measurement data requires manual input and calculation, it is easy to confuse errors during the data recording process, and also reduce the work efficiency. The Sartorius balance provides an interface for external devices, which can control the weighing of the balance by an external computer and record the data, so that the entire weighing process can be automated and informatized, which not only shields the error that human records are easy to make, but also Improve work efficiency and facilitate data management.
references
[1] Limits and measurement methods for emission control of vehicle fuel-ignition and gas-fueled ignition engines and vehicles (China III, IV, V) GB 17691-2005
[2] Announcement on the implementation of the national fourth stage vehicle compression ignition engine and vehicle pollutant emission standards
Author: Chang-ching: Laboratory Operations, Cummins East Asia R & D Co., Ltd.
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