Application of Yudian AI Instrument in Condensate Recovery System

**Author: Jang Dong-Min, Jiangsu Xinhai Petrochemical Co., Ltd.** **Abstract:** This paper presents a case study of the condensate recovery system at Jiangsu Xinhai Petrochemical Co., Ltd., highlighting the successful application of the Yudian AI-708 artificial intelligence regulator. The article discusses how the AI-708 plays a crucial role in the system, demonstrating its high precision, stability, and ease of use through real-world operations. The implementation has significantly improved safety, efficiency, and reduced maintenance time and failure rates. **Keywords:** condensate system, AI-708 intelligent regulator, composite membrane **0. Introduction** In today’s industrial environment, control requirements are becoming increasingly demanding, especially for critical equipment such as temperature regulation. Inaccurate control can lead to severe equipment damage, making it essential to choose reliable and safe control systems. Our company's condensate recovery system has successfully integrated the Yudian AI-708 instrument, enabling precise control of the automatic valve operation. This not only enhances production safety but also boosts work efficiency while reducing downtime and failure rates. **1. AI-708 Intelligent Instrument and Condensate Recovery System Design Requirements** **1.1 Main Technical Parameters** **1.1.1 Smart Meter and Process Flow Description** The system utilizes the Yudian AI-708 intelligent control instrument to execute control commands and regulate the valve. By setting the desired value in the smart meter based on process requirements, the system outputs signals to control the valve opening. The current operation shows that the control is highly sensitive, effective, and stable. **Process Flow:** Condensate is first controlled into the condensate tank, then pumped through a degreasing and de-ironing filtration system. Qualified water is directed to the clean water tank, and then supplied to the process system via the clean water pump. Unqualified water is recycled. **Figure 1: Process flow chart of condensate recovery unit** ![Application of Yudian AI Instrument in Condensate Recovery System](http://i.bosscdn.com/blog/20/14/09/2609205897819.jpg) **1.1.2 Chain Protection System** **1.1.2.1 Influent Water Quality Online Monitoring System** An online monitoring system is installed at the condensate inlet to ensure the quality of incoming water. If oil content exceeds 30 mg/L, the condensate is directly discharged to the sewage pipeline. Otherwise, it enters the treatment system. **1.1.2.2 Effluent Quality Online Monitoring System** At the outlet of the precision filter, an online system ensures that the oil content of the treated water is below 1 mg/L before entering the clean water tank. If unqualified, the system automatically redirects the water back for reprocessing. **1.1.2.3 Low-Flow Online Protection System** Installed on the inlet and outlet pipes of the composite membrane system, this system prevents membrane detachment by maintaining the flow rate above 16 t/h. When flow drops, the system holds the pump and recycles part of the water. **1.1.2.4 Precision Filter Differential Pressure Protection System** This system monitors pressure differences across the filter. When the differential pressure reaches 150 kPa, it alerts the operator to manually clean the filter and restore normal operation. **2. Equipment Configuration** **2.1 Hardware Configuration** The control system includes the iron removal and degreasing system, multiple motors, Siemens S7-300 PLC, Yudian AI-708 instruments, and force control software. Here, we focus on the Yudian AI-708. **2.2 Yudian AI-708 Intelligent Regulator** **2.2.1 Main Features** The AI-708 features digital correction, advanced AI tuning algorithms, modular design, and high accuracy (0.2%). It supports various inputs, including thermocouples, RTDs, and linear signals. It offers programmable control, event output, and SV variable output functions. The device also supports AIBUS communication and has built-in anti-interference capabilities. **2.2.2 Operating Instructions** ![Application of Yudian AI Instrument in Condensate Recovery System](http://i.bosscdn.com/blog/20/14/09/2609205921112.jpg) **3. Conclusion** After years of practical operation, the Yudian AI-708 has proven to be reliable and efficient. Its ability to precisely control the valve opening ensures smooth film laying and enhances system performance. The AI-708 provides high precision, excellent safety, and user-friendly operation, making it a valuable asset in industrial applications. **Photo of On-Site Equipment:** **Figure 3: Supporting Equipment** ![Application of Yudian AI Instrument in Condensate Recovery System](http://i.bosscdn.com/blog/20/14/09/2609205958432.jpg) ![Application of Yudian AI Instrument in Condensate Recovery System](http://i.bosscdn.com/blog/20/14/09/2609205963533.jpg) ![Application of Yudian AI Instrument in Condensate Recovery System](http://i.bosscdn.com/blog/20/14/09/2609205924644.jpg) ![Application of Yudian AI Instrument in Condensate Recovery System](http://i.bosscdn.com/blog/20/14/09/2609205907936.jpg) **References** [1] AI Series Intelligent Regulator Instruction Manual V7.0. Xiamen Yudian Automation Technology Co., Ltd. 2008.7 [2] Li Gong. Operation Rules for Condensate Recovery Unit. Shandong Water Affairs Co., Ltd. [3] Gao Fang. Principle of Composite Membrane Operation. Shandong Water Affairs Company **Author Information:** Zhang Dongmin (born in 1985), male, graduated from China University of Petroleum (East China), majoring in Chemical Engineering and Technology. He holds senior instrument and e-commerce titles. Currently working as an engineer in the workshop at Jiangsu Xinhai Petrochemical Co., Ltd., specializing in instrument maintenance, DCS, and PLC programming.

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