Cost-Effective Monitoring of the Fuel Air Equivalence-Ratio with a Lambda Sensor and a Microcontroller in a Downdraft Biomass Gasifier

The operation of biomass treatment devices such as gasifiers is based on the control of key parameters that play an important role in product formation. These include: temperature, excess oxygen, relative humidity and biomass composition. This work focuses on excess oxygen and temperature. Unfortunately, flue gas oxygen analyzers are expensive and not accessible to small industries. However, the equivalence ratio is linked to excess oxygen and has the advantage of not depending on biomass composition. This study therefore focuses on the design and development of a device for controlling this equivalence ratio by measuring oxygen concentration using a self-propelled Lambda probe, and a system for monitoring this equivalence ratio using an Arduino Uno 3 microcontroller. The temperature is recorded with an accuracy of ±1.5°C. For a heating time of 10 minutes, the response time to temperature change is around 3 seconds, which is sufficient for the device to function properly. This simple device is an efficient and cost-effective means of checking the equivalence ratio.

基于炭浆的氧传感器空气孔道制备

为了制备平整的氧传感器芯片空气孔道,采用了丝网印刷的方法。相应配制了一种适印性的炭浆,优化的条件为:优选了活性炭和松油醇、最佳的球磨级配为m_(Φ6.5)∶m_(Φ3)=1∶2、球磨时间为12 h、分散剂含量为30%、胶含量为5%。在优化的条件下制备的空气孔道平整稳定,该制备方法具有精度高、形状平整可控、成本低以及操作简便等优点。

汽车电控发动机氧传感器的检测

为了对发动机电子控制系统实现精确闭环控制,在系统中安装了氧传感器。介绍氧传感器的类型、工作原理,分析汽车电控发动机氧传感器常见故障和检测方法,为相关人员学习和检测维修提供参考。

基于PMMA微球造孔剂的多孔保护层制备

为了减少废气中杂质在汽车氧传感器芯片电极上沉积和发生化学反应的损害,提高芯片的稳定性和寿命,通过丝网印刷的方式,在电极表面增加多孔保护层。通过对造孔剂种类、粒径、含量以及配方优化来调整保护层的孔隙。优化的条件为:优选钇稳定氧化锆8YSZ作为粉体材料、5μm聚甲基丙烯酸甲酯(PMMA)微球为造孔剂、造孔剂含量为15%、胶含量为6%、固含量为39.39%、粘接剂树脂优选为15%EC4+10%EC45的乙基纤维素。在优化条件下配制的保护层浆料烧结后孔隙多、孔径均匀;平均孔径为2.44μm,有利于保护层对废气起到较好的"过滤"作用。