Incontrollable blowdown TDS
Manual TDS monitoring results in losing sensible heat energy generated inside the boiler thus
consuming more fuel, also more water and chemicals
Boiler 1
Make
StandardKessel
Capacity (t/h)
2
Design p (barg)
13
Operating p (barg)
9
Blowdown TDS range
750 - 2250
Feedwater TDS
180
Manual valve size (inch) 1
Boiler 2
Homani
3.2
15
9
1780 - 2360
180
1.5
Steam demand for bar hall = 485 100 kg/year
Existing blow down
Required blow down
𝐹𝑒𝑒𝑑 𝑤𝑎𝑡𝑒𝑟 𝑇𝐷𝑆 ∗ 𝑠𝑡𝑒𝑎𝑚 𝑙𝑜𝑎𝑑
𝐵𝑙𝑜𝑤𝑑𝑜𝑤𝑛 𝑇𝐷𝑆−𝐹𝑒𝑒𝑑 𝑤𝑎𝑡𝑒𝑟 𝑇𝐷𝑆
=
𝐹𝑒𝑒𝑑 𝑤𝑎𝑡𝑒𝑟 𝑇𝐷𝑆 ∗ 𝑠𝑡𝑒𝑎𝑚 𝑙𝑜𝑎𝑑
𝐵𝑙𝑜𝑤𝑑𝑜𝑤𝑛 𝑇𝐷𝑆−𝐹𝑒𝑒𝑑 𝑤𝑎𝑡𝑒𝑟 𝑇𝐷𝑆
180 ∗ 485100
2360−180
=
= 40 054 kg/y
180 ∗ 485100
3500−180
= 26 300.6 kg/y
∴ Excess blowdown = 13 753.4 kg/y
Savings = 13 753.4 kg/Y * 182.54 kcal/kg = 2 510 545.6 kcal/year
= 257.5 kg fuel/year
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