8/16/2019 Blowdown Quantity Calculation

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IJT BLOW DOWN QUANTITY CALCULATIONEWS - 024/0

Sheet 01 of 01

1. Boiler Steaming capacity at MCR TPH E

2. Solids content in feed water

(Refer feed water quality from contract) ppm S3. Maximum permitted concentration of solids in

 boiler water ppm C

4. Continuous blow down rate as percentage of

evaporation rate

B1 = S X 100 = X 100

  C - S - .

% B1

5. Continuous blow down quantity

 W2 = E x B1 X1000 = X X 1000.

  100 100 Kg/hr W2

6. Water content of boiler m3  V

7. Duration of intermittent blowdown (1/2 hour) hrs d

8. Interval between completion of one blow downoperation and completion of the next (8 hrs.) hrs. t

9. Intermittent blow down rate as percentage of

evaporation rate

B2 = 100 x t x S x V .

  d x (C x V - 0.5 x S x E x (t-d) - V x S)

= 100 x x x .

 x ( x - 0.5x x x( - )- x )

% B2

10. Quantity of boiler water discharged during each

intermittent blow down

Q = E x t x S x V .

  C x V - 0.5 x S x Ex (t-d) - V x S

= x x x .

 x - 0.5 x x x ( - )- x m3 Q

11. Concentration of solids in boiler water on

completion of intermittent blowdown

C1= C - (t-d) x S x E

  V

= - ( - )x x .

ppm C1

12. Average intermittent blow down rate as

percentage of evaporation rate

B A = Q x 100 = x 100

  t x E x

% B A

Project : Contract No. : Rev. No. :

Prepared by : Approved by : Date :