Track blowdown volume, heat loss, and water replacement. Compare manual, continuous, and target cycle scenarios. Improve boiler control using dependable maintenance planning outputs daily.
| Steam Rate (kg/h) | Feed TDS (ppm) | Boiler TDS (ppm) | Cycles | Estimated Blowdown (kg/h) |
|---|---|---|---|---|
| 8000 | 120 | 2400 | 20.00 | 421.05 |
| 10000 | 150 | 3000 | 20.00 | 526.32 |
| 12000 | 180 | 3600 | 20.00 | 631.58 |
| 15000 | 200 | 4000 | 20.00 | 789.47 |
Cycles of concentration: Cycles = Boiler Water TDS ÷ Feedwater TDS
Boiler blowdown rate: Blowdown Rate = Steam Generation Rate ÷ (Cycles - 1)
Blowdown percentage: Blowdown % = (Blowdown Rate ÷ Steam Rate) × 100
Heat loss estimate: Heat Loss kWh/h = Blowdown Rate × 4.186 × (Blowdown Temp - Feed Temp) ÷ 3600
Water loss: Water Loss m³/day = Daily Blowdown kg/day ÷ 1000
This method is practical for routine operating reviews. It is useful for checking blowdown control, comparing target cycles, and estimating avoidable water and energy losses.
Boiler blowdown removes dissolved solids from the boiler water. This keeps scale, carryover, and sludge under control. A good blowdown rate protects heat transfer surfaces and helps stable steam production. Poor control wastes hot water, treatment chemicals, and fuel.
The calculator starts with feedwater TDS and boiler water TDS. Their ratio gives cycles of concentration. Higher cycles usually mean better water use. Very high cycles can also raise scaling risk if water treatment is weak. The blowdown equation then estimates how much water must leave the boiler to keep solids within the chosen limit.
The actual result shows the blowdown rate based on present water quality. The target result shows a comparison case using your preferred cycles. This makes it easier to check if the current operation is wasting water and energy. The heat loss output estimates the sensible heat leaving with hot blowdown water. The cost outputs convert those losses into daily and yearly values.
This tool is useful for maintenance teams, plant engineers, construction support crews, and energy auditors. It helps during commissioning, seasonal review, chemical treatment checks, and operating cost studies. It can also support improvement plans for blowdown valves, conductivity control, heat recovery, and makeup water management. Use it together with actual field sampling, treatment vendor limits, and boiler manufacturer guidance for the best decisions.
Boiler blowdown is the controlled removal of water from a boiler. It lowers dissolved solids, sludge, and suspended matter so internal surfaces stay cleaner and steam quality remains more stable.
A lower rate can reduce water waste, fuel waste, and chemical loss. It can improve efficiency, but only when water chemistry remains inside safe operating limits.
Cycles of concentration show how many times dissolved solids are concentrated in the boiler compared with incoming feedwater. Higher cycles usually mean less blowdown.
No. It is a planning and review tool. Final operating limits should still follow treatment specialist recommendations, site water tests, and boiler manufacturer instructions.
Feedwater TDS sets the starting solids level entering the boiler. If feedwater TDS rises, the boiler usually needs more blowdown to hold the same internal concentration.
It estimates the sensible heat carried away by hot blowdown water. This helps quantify hidden energy loss and compare improvement scenarios.
Continuous blowdown often gives steadier solids control. Manual blowdown may still be needed for sludge removal. The best setup depends on boiler design and operating practice.
Yes. It is useful during startup and tuning. It helps estimate expected blowdown, review target cycles, and discuss water and energy impacts before final operating settings.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.