This paper takes the calculation of the boiler feed water system of a supercritical direct air cooling unit as an example, and introduces the selection process of the boiler feed water in power plants. The power plant uses reservoir water as the water source, and the designed water production is 150 m~3/h. The main process flow is: raw water-multi-media filter-ultrafiltration-reverse osmosis-ion exchange demineralization. This paper mainly introduces the choice of demineralized water system for this project, compares several treatment methods of boiler feed water commonly used in power plants, and finally chooses double membrane method+ ion exchange as the final scheme. The choice of reverse osmosis pretreatment process, the raw water quality condition was analyzed, and the conventional control parameters of reverse osmosis pretreatment were determined. The fouling tendency caused by strontium ions was the main control object of this reverse osmosis pretreatment, and the multi-media filter was selected. +Ultrafiltration as a pretreatment for reverse osmosis, and introduced the calculation results of the multi-media filter and ultrafiltration equipment, and optimized the layout of the equipment itself, such as adding manual to the positive discharge vent of the multi-media filter.valve. Reverse osmosis process design, combined with design software and design experience, selected for reverse osmosis calculation, optimized for reverse osmosis equipment, such as adding check valves in reverse osmosis concentrated water recovery port. The ion exchange process design introduced the problems encountered in the ion exchange process selection and improved the ion exchange process equipment, such as replacing the original primary demineralization system by using a perforated plate water cap + resin trap. The current operation and summary of the project, analysis of the current problems of the project is that the scale inhibitor does not play a role in scale inhibition, it is recommended to replace the scale inhibitor.
Inner Mongolia Environmental Protection