Zhongyuan Dahua has taken multiple measures to reduce melamine consumption

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Zhongyuan Dahua has taken multiple measures to reduce melamine consumption. The Triamine Division of Zhongyuan Dahua operates three melamine production units. Affected by the pandemic, the market is sluggish, resulting in an imbalance between production and sales. Since 2020, the Triamine Division has taken a series of measures to promote energy conservation and potential tapping, energy-saving technological upgrades, and comprehensive process inspections. In August, the material consumption per ton of melamine products dropped significantly; the consumption of steam was 11.07 tons, reaching a historic low. Production costs were reduced by 201 yuan per ton due to lower material consumption per unit. In June and July, taking advantage of periods when the equipment was shut down, eight energy-saving and potential-exploiting modifications were carried out. The optimization of the liquid-phase pathway in the high-pressure wastewater hydrolysis tower has been completed. The high-pressure wastewater is hydrolyzed, and the high-temperature liquid from the tower is sent to the first and second set of triamine carbon dioxide stripping units, resulting in a savings of approximately 1 ton of steam per hour. This also stabilizes the operation of the stripping towers and prevents blockages in their trays. Optimize the steam system. Strictly implement water balance operations to prevent abnormal water addition to the system and reduce steam consumption. Implement labeled management for 1,300 steam traps. Responsibilities are assigned to specific individuals; weekly inspections are conducted. Steam traps are managed in accordance with the “one closure, two restrictions, three controls” working model. Upon identifying any issues, a “five-fix” schedule is formulated. A total of 98 issues were identified; 86 of them were rectified in a timely manner, while 12 remain under control. As a result, steam consumption has decreased by approximately 2 tons per hour. Optimize the circulating water system. First, measure the temperature difference between the inlet and outlet water of the cooling water heat exchanger on a weekly basis, adjust the return water valve accordingly, conduct risk analysis, and issue operational guidelines. Second, promptly isolate the circulating water for shut-down rotating equipment. Through the above measures, the unit consumption of circulating water was reduced by 83 tons. Optimize the electrical system. First, regularly identify abnormal users. Weekly inspections are conducted on internal users within the division; a total of five abnormal users have been identified (at locations P8201, P8102, at the bearing ends of SP8101A/B, and at P8129). External users operating facilities related to fertilizers, Green Universe, and cyanuric acid are inspected once a month. Second, implement timed control over the test run durations of air compressors, urea melting systems, etc. Through the above measures, the power consumption per unit decreased by 48 degrees. In 2000, 2002, and 2005, Zhongyuan Dahua successively adopted the high-pressure process technology provided by Italy’s Lurgi to construct three melamine production plants, with production capacities of 12,000 tons, 12,000 tons, and 30,000 tons respectively. After subsequent modifications, the total production capacity reached 60,000 tons.