Signal processing and control of an electronic valve for chemical injection pumps

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Chemical injection is utilized for maintaining flow, reducing corrosion and scaling and improving oil and water treatment operations. It has been widely used in many industries including refineries, water treatment and oil sands processing. The chemical industry has been making attempts to provide their chemicals (typically polymers) in a more concentrated form to reduce the cost of shipping. Solvents or carrier fluids in the polymers are reduced which causes the chemical to become very viscous. Also, many of the chemical requirements (e.g., the rate of injection volume and the type of chemicals) of a new plant are unknown until the plant is up and running. These requirements may change dramatically from the plant start-up to full operation. The above facts require that a chemical injection system can work with high viscous chemicals and can operate in a large range of injection rate. The proposed research work is an integral part of the development of a chemical injection system that satisfies the above requirements. The main objectives of the proposed research work include 1) the development of fast and effective online injection pump head pressure signal processing and pattern recognition algorithm that can work in a large pressure range and is robust to high measurement noise; and 2) the development of control algorithm for precise timing of the fluid entering and leaving the pump head according to patterns identified by the signal processing algorithms.