How to recover heat from Boiler blow-down? (Energy Efficiency Tip of the Day)
How to recover heat from Boiler blow-down? (Energy Efficiency Tip of the Day) Tip summary o The boiler blow-down process involves the periodic or continuous removal of water from a boiler to remove accumulated dissolved solids and/or sludge. o During the process, water is discharged from the boiler to avoid the negative impacts of dissolved solids or impurities on boiler efficiency and maintenance. However, boiler blow-down wastes energy because the blow-down liquid is at about the same temperature as the steam produced. o Much of this heat can be recovered by routing the blow down liquid through a heat exchanger that preheats the boiler’s make-up water. o The recovered heat can be used to preheat boiler make-up water before it enters the de-aerator, and for low-pressure steam to heat water inside the de-aerator, which reduces the cost to run the de-aerator and improves overall boiler efficiency. Proposed actions o Evaluate the amount of heat in your bow-down stream. o Evaluate the amount of heat recovered in case of Preheating BFW before de-aerator. o Evaluate the economics of the required changes. Economics o Medium cost opportunity with a good ROI. Savings o Estimated energy savings range: 2-3% of boiler energy use. o Decrease equivalent amount of boiler load and decrease CO2 emissions accordingly to save the environment. Conclusion o Blow-down heat recovery: savings of 2% of boiler energy use. o Please share this tip with others to share knowledge and increase energy efficiency awareness. o Please contact me for any advice or support about this issue or other energy management issues. My blog www.360proactiveengineer.com #Energy #energyefficiency #energymanagement #steam #steamsystem #sustainable #sustainability #engineering #engineer #chemicalengineering #boiler #360practiveengineer #loadmanagement #steamboiler #blowdown
