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“With the inverter in use, at least 200,000 yuan can be saved each month. ”On August 3, in front of the low-voltage distribution cabinets in the 6-kilovolt distribution room of the main transformer at the third fertilizer production unit of Ningxia Petrochemical Company, six employees from the Electrical and Instrumentation Team 3 did some calculations regarding ways to improve quality and efficiency. Recently, the designed flow rates at the outlets of the two ammonia transfer pumps in the ammonia station of the three fertilizer production units were too high, resulting in insufficient filling during the loading of liquid ammonia. The returning liquid ammonia caused an increase in the temperature and pressure inside the ammonia tanks. This requires not only the release of some ammonia gas, but also frequent activation of the two chillers for cooling, resulting in increased power consumption. Yu Yong, deputy director of Workshop 2 in the Electrical and Instrumentation Department, suggested adding an inverter to change the pump’s operation mode from fixed-frequency to variable-frequency operation. Technicians and employees from Shift 3 of the electrical and instrumentation team held a brainstorming session to come up with specific plans. On the one hand, apply to the Maintenance Department to arrange for a professional company to conduct a thorough inspection and repair of the frequency converters that have been unused for many years; on the other hand, expedite the completion of tasks such as preparing technical plans, removing obsolete materials, and configuring the DCS system. All the spare parts were in place, and the employees of the electrical third shift completed the wiring and debugging work between the low-voltage cabinets, frequency converter cabinets, motors, and DCS cabinets within two days. After the renovation, ammonia emissions are reduced by about 100 tons per month, resulting in savings of 200,000 yuan per month. The energy consumption associated with starting the chillers and the ammonia transfer pumps is reduced by about 40,000 kWh, leading to electricity cost savings of 18,000 yuan. Not only that, but the once-used equipment has been revived through renovation.