The measurement technology of soot velocity based on electrostatic method

For a long time, China’s energy structure has been dominated by coal-fired power generation. The smoke and dust generated by coal-fired power generation are the main atmospheric particulate pollutants, causing serious harm to the environment and human health. It is very important to monitor the speed of soot emission accurately to prevent environmental pollution effectively. In view of the advantages of electrostatic sensor with high sensitivity, not affected by flue dust accumulation, simple structure and low cost, this paper adopts probe electrostatic sensor to measure dust flow parameters in power plant flue. By acquiring the electrostatic signal which contains rich information of two-phase flow, the dust flow velocity is monitored by the spatial filtering method based on Hilbert-Huang transform. Through constructing pneumatic conveying experiment platform measuring system, the static characteristic of flow velocity is tested. The experimental results show that the electrostatic method used to detect the smoke velocity data has higher reliability, measurement error is smaller, the smoke velocity detection technology has significant improvement.