Heat Pump-based Energy-efficient Waste Heat Recovery Technology-Beijing Sino-Sci Columbus Environmental Science & Technology Research Institute Co., Ltd.

Technical Overview

Under China’s national "Dual Carbon" strategy and the advancement of green energy development goals, our company has optimized energy consumption in industrial systems—a growing market priority—by integrating decades of research on distillation processes and practical experience from over 100 distillation system deployments. By combining heat pump waste heat recovery technology with traditional stripping-distillation ammonia removal methods, we developed an energy-efficient heat pump waste heat recovery system. This innovation maintains superior performance in ammonia-nitrogen treatment, high ammonia recovery rates, and robust system stability, while significantly reducing steam consumption, cooling water usage, and carbon emissions. It achieves efficient heat recycling within the system, empowering clients to lower costs and enhance operational efficiency. To date, we have implemented nearly 10 demonstration projects across industries such as ternary precursor materials, power battery recycling, and tungsten-molybdenum processing.

Our solutions are extensively applied across industries including non-ferrous metallurgy, chemical, photovoltaic, energy storage, pharmaceutical, and food for heat recovery and energy-saving retrofitting projects.

Challenge
In conventional deammoniation systems, a significant portion of the latent heat from secondary steam is not effectively recovered, leading to excessive steam consumption and high carbon emissions.
Innovation
By adopting MVR heat pump technology for heat recovery, the system achieves reduced steam consumption, lower circulating water usage, and enhanced energy efficiency.
Achievement
Granted 4 invention patents and utility model patents
Economy
The annual amount of wastewater treated to meet standards is 3.7 million tons, saving customers a cumulative operating cost of approximately 29 million yuan each year, and achieving a cumulative annual carbon emission reduction of up to 21,064,059.3kg

Technical Principles

Based on the second law of thermodynamics and leveraging thermodynamic cycle principles, ammonia-laden vapor from the top of the column enters the evaporator to exchange heat with steam condensate. The vaporized low-grade steam is pressurized and heated via compressor work, thereby upgrading its thermal potential. This enhanced steam then serves as a heat source for the reboiler, where it condenses and releases latent phase-change heat, supplementing thermal energy to the deammoniation tower. This closed-loop process achieves cyclic heat recovery, significantly improving system-wide energy utilization efficiency.