Exhaust emission monitoring system based on the Internet of Things for ships passing through waterway lock

To solve the problem of ship exhaust emission monitoring in Domestic Emission Control Areas (DECA), we present an Internet of Things (IoT)-based ship exhaust emission monitoring system in this paper. The system consists of three parts: a ship exhaust monitoring device installed above the lock, an IoT data platform, and a comprehensive display platform. The monitoring device uses an STM32 microcontroller as the Main Control Unit (MCU), obtains the concentration of various gases such as SO₂ and CO₂ in the smoke plume of the passing ships through gas sensors, and uploads real-time data to the ThingsBoard IoT data platform through the NB-IoT module. Finally, the fuel sulfur content (FSC) is calculated in the back end and is rendered to the front-end page. The test results show that the detection errors of SO₂, CO₂, and NO₂ are - 0.7%, - 3.2%, and 3.7% respectively. The result proves that the system has high monitoring accuracy and can effectively improve the efficiency of ship emission supervision.