What are the main new energy-saving technologies used domestically and internationally in the utility sector?

There are too many of these; in China, there aren’t many energy-saving measures that require technical expertise. We don’t have access to foreign technologies either. I hope that experts on the chemical engineering forum will step forward to answer the original poster’s questions

Low-temperature waste heat recovery. To recover the waste heat from flue gas and low-temperature water, heat pipe exchangers and heat pumps can be used to achieve this

Public utility systems are part of the service sector; the equipment is standardized, and it is very difficult to make changes to it later on. It’s difficult to get funding approval

It’s things like condensed water recovery and recycled wastewater utilization

Regarding energy savings in utility systems, what our company is implementing includes: a circulating water system – variable frequency drives for circulating water pumps, and water-driven fans for cooling tower fans； Desalination system: UF+RO; this is a more conventional mixed-bed system that reduces the consumption of acids and bases, ensures proper control of the quality of the incoming water, and helps to minimize waste ； Reclaimed water reuse system: The wastewater from the circulating water system is treated to reduce turbidity and desalinated before being reintroduced into the circulating water system ； Wastewater system: After treatment, it enters the circulating water system ； Condensate is recovered and fed into the deaerator ； Air-conditioning heating system: utilizes waste heat recovery for heating ； Rainwater drainage system: Recycled into the circulating water system ； Fire protection system: Variable-frequency voltage stabilization control ；

We mainly recover the condensate water from heat exchangers for use as make-up water in the circulation system, which reduces various parameters of the circulating water and saves acid and chemicals.

Using variable frequency drives for the centrifugal pumps in circulating water systems is not energy-efficient enough. The cost of installing variable-frequency equipment is also quite high. There is a technology known as jet wake three-dimensional flow, which involves modifying the impeller of a centrifugal pump; by reducing the opening degree of the outlet valve, the flow rate of water increases while the electrical current decreases. Some domestic factories have been successfully upgraded. You can take a look at it.

There are many energy-saving technologies. Those we work with include variable-frequency technology for fans and water pumps, application technologies in wastewater treatment, boiler exhaust heat exchangers, preheating recovery, preheating power generation, and so on

We used this technology, but the effect was not significant.:L