Recently, the key science and technology project Research and Application of Key Technologies for Carbon Emission Measurement in Coal-Fired Power Plants, specifically its third subtopic Research and Demonstration of Key Technologies for Continuous Carbon Dioxide Monitoring, undertaken by Jinjie Company, a subsidiary of China Shenhua, successfully passed the final appraisal conducted by the Chinese Society for Electrical Engineering (CSEE). The appraisal committee confirmed that the project's overall technology has reached internationally advanced level.
To address challenges such as prolonged response time of traditional carbon monitoring systems, signal mismatch between concentration and flow rate, and significant deviations in flow measurement under complex flue conditions, the project team focused on key technologies including precise flue gas flow measurement and online carbon dioxide concentration monitoring. This effort led to the successful development of a precise carbon emission monitoring system for thermal power units. As a core contributor, Jinjie Company undertook the critical tasks of developing key technical equipment, implementing on-site engineering, and scaling applications. Based on tunable diode laser absorption spectroscopy (TDLAS) technology, which employs lasers to accurately identify and measure gas concentrations, the team constructed an in-situ hot-wet method online monitoring system for carbon dioxide concentration. This system integrates a multi-channel ultrasonic time-difference method flow velocity monitoring module, achieving the first real-time synchronous acquisition of concentration and flow velocity in China, thereby overcoming the sampling delays associated with the cold-dry method and errors from dry-wet basis conversion. The system's response time is less than 30 seconds, and less than one-sixth of the response time limits stipulated by EU and domestic standards. In terms of core measurement accuracy, the CO2 concentration accuracy reaches 0.1%, significantly surpassing the accuracy requirements specified by the U.S. EPA standards. In terms of long-term operational stability, zero drift is controlled within 0.1% of the range, and span drift is as low as 0.4%, both substantially outperforming general domestic and international technical indicators.
Currently, the system has been applied on a large scale across different unit types and flue configurations at the company, with stable and reliable equipment operation. The accurate emission data generated by these outcomes can help enterprises avoid economic losses in carbon trading caused by data discrepancies, provide a scientific basis for optimizing combustion adjustments and formulating emission reduction strategies, reduce carbon emission intensity per unit of power generation, and enhance revenue from carbon market trading. Simultaneously, it provides precise data support for ecological and environmental supervision authorities, empowering green and low-carbon development through sci-tech innovation.
