Advantages and disadvantages of using a retreat strategy for syngas and chiller compressor units
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The syngas in hydrogen production and ammonia synthesis plants, as well as the chiller compressor units, use the MARK VI control system, and a fallback strategy is not enabled. May I ask those experienced with such units about the advantages and disadvantages of using a fallback strategy?
The fallback strategy is an emergency measure adopted by the unit in the face of failures and abnormal conditions. Its main advantages include: 1. Improved safety: The fallback strategy enables timely detection and response to failures, ensuring the safe operation of the unit and preventing accidents. 2. Equipment protection: By employing fallback strategies, the impact of failures on equipment can be reduced, thereby extending the equipment’s lifespan and saving on maintenance and replacement costs. 3. Reduce production losses: The fallback strategy enables rapid response to failures, minimizing downtime and thus reducing production losses. However, the retreat strategy also has some disadvantages: 1. Complexity: Formulating and implementing a retreat strategy requires considering various possible failure scenarios and designing corresponding procedures, which makes it quite complex. 2. Increased risks: The operations involved in a fallback strategy may introduce new risks, such as potential failures in other devices or systems; it is necessary to carefully assess and manage these risks. 3. Feasibility constraints: In some cases, the characteristics of the unit and the equipment configuration may limit the feasibility of retreat strategies, requiring comprehensive evaluation and optimization. Overall, the retreat strategy plays an important role in improving unit safety and protecting equipment, but it requires thorough evaluation and testing prior to implementation to ensure its feasibility and risk control. .
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After discussing the matter with engineers from GE, a fallback strategy was basically established: (1) When the temperature measurement instrument malfunctions (1. Out of range； (Exceeding the rate of change limit): The design value is used in place of the measured value, triggering an alarm ； (II) To prevent failures in the outlet pressure transmitter or blockages in the pressure guiding tubes, which could result in constant pressure; using cascade control might lead to overspeeding. In such cases, the opening degree of the speed control valve is regulated by utilizing the outlet and inlet pressures, and the anti-surge valve is opened in advance.