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

化学品注入用于保持流动，减少腐蚀和结垢，并改善油和水处理操作。它已被广泛应用于许多行业，包括炼油厂，水处理和油砂加工。化学工业一直在尝试以更浓缩的形式提供其化学品（通常是聚合物），以降低运输成本。聚合物中的溶剂或载液减少，这导致化学品变得非常粘稠。 此外，许多化学要求（例如，注入体积的速率和化学品的类型）直到装置启动和运行时才知道。这些要求从工厂启动到全面运行可能会发生巨大变化。上述事实要求化学品注入系统可以与高粘度化学品一起工作并且可以在大范围的注入速率下操作。所提出的研究工作是满足上述要求的化学品注入系统开发的一个组成部分。所提出的研究工作的主要目标包括：1）开发快速有效的在线注射泵压头压力信号处理和模式识别算法，该算法可以在大压力范围内工作，并且对高测量噪声具有鲁棒性;以及2）根据由信号处理算法识别的模式开发用于流体进入和离开泵压头的精确定时的控制算法。

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.