The Quanji urea high-temperature water waste heat recovery project was successfully put into operation

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The waste heat recovery project for urea high-temperature water in Quanji Company has been successfully put into operation. Author/Source: Lu’an Chemical Fengxi Group. Date: 2022-04-08. Clicks: 12. Quanji Company’s “dual control of energy consumption” project – the waste heat recovery system for urea high-temperature water – enabled a lithium bromide unit to start trial operation on March 25th. This project primarily uses a 325 t/h high-pressure water at 135→115°C from the urea plant to drive a 4.88 million kcal hot-water lithium bromide chiller unit. The 135°C high-temperature water from the urea plant is directly fed in; after releasing heat, the temperature of this high-temperature water drops to 115°C, after which it returns to the original high-temperature water pipeline to be further sent to the high-pressure washer for heat absorption ； The 7°C cold water produced by the refrigeration unit is pumped by a cold water pump to the lithium bromide synthesis cold water tank, where it undergoes intensive cooling until its temperature rises to around 13°C, after which it returns to the lithium bromide unit. Once this project is put into operation, 8 tons of steam can be saved per hour during spring and winter, resulting in a reduction of 720 kilograms of standard coal per unit of ammonia produced ； By operating the high-efficiency lithium bromide hydrate system and the conventional lithium bromide synthesis system simultaneously during the summer, it is possible to overcome the problems of high current consumption and heavy load on ice-making machines in summer. This approach enables high and stable production levels while significantly reducing the energy consumption of these machines; preliminary estimates suggest that this solution can save 5,760 tons of standard coal per year. Currently, the project is in trial operation; cold water has been integrated into the system’s piping network, and all equipment is operating smoothly with stable performance. The successful commissioning of the urea high-temperature water waste heat recovery project demonstrates the company’s commitment to focusing on the control of energy consumption, to tapping into internal potential and taking comprehensive actions to advance various energy-saving measures and projects. The implementation of this project lays a solid foundation for achieving the annual goals set for energy consumption control.