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作者用微粒取样系统和热重分析系统,在X2105型柴油机上进行了柴油机废气中微粒质量浓度测量技术的研究.试验结果表明,柴油机微粒排放的质量浓度不仅取决于发动机的运转工况,而且还与微粒取样过程中废气和空气的混合稀释状态有关.大的稀释比和高的混合温度均能降低微粒质量浓度.导致质量浓度变化的原因是微粒中可挥发组分碳氢化合物在稀释条件变化时发生的吸附、解吸、冷凝、蒸发等物理化学现象随之变化,微粒中碳粒质量不受以上条件影响.试验中的现象与Clausius-Clapeyron冷凝公式和Iangmuir吸附公式所解释的结果一致.
The author uses Particle Sampling System and Thermogravimetric Analysis System to study the technology of particle concentration measurement in diesel engine exhaust on X2105 diesel engine.The test results show that the mass concentration of diesel particulate emissions depends not only on the operating conditions of the engine but also Related to the dilution and dilution conditions of exhaust gas and air during particle sampling.The large dilution ratio and high mixing temperature can reduce the mass concentration of the particles.The reason for the change of mass concentration is that the volatile components in the particles vary in the dilution conditions The physical and chemical phenomena such as adsorption, desorption, condensation and evaporation change with time, the quality of the carbon particles in the particles is not affected by the above conditions.The phenomena in the experiment are consistent with the results explained by the Clausius-Clapeyron condensation formula and the Iangmuir adsorption formula.