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

化学注入用于维持流体流动，减少腐蚀和结垢，改善油水处理作业。它已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体流体减少，导致化学物质变得非常粘稠。此外，新工厂的许多化学需求（例如，注入量的速率和化学物质的类型）在工厂启动和运行之前是未知的。从工厂启动到全面运行，这些要求可能会发生巨大变化。上述事实要求化学注入系统能够处理高粘性化学品，并能在大范围的注入速率下工作。拟议的研究工作是开发满足上述要求的化学注射系统的一个组成部分。提出的研究工作的主要目标包括：1)开发快速有效的在线喷射泵扬程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；2)根据信号处理算法识别的模式，开发流体进入和离开泵头的精确定时控制算法。

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.