This document analyzes water reduction from sampling lines in a steam-water cycle at a power plant. It calculates that sampling lines across two stages result in a total water reduction of 1512 cubic meters per month. Specifically, stage I has 37 sampling lines reducing water by 799 cubic meters per month, while stage II has 33 sampling lines reducing water by 712 cubic meters. Reducing this water waste provides advantages like lower ammonia and chemical consumption and reduced effluents.

1. FROM SAMPLING LINES OF STEAM -WATER
CYCLE
BY DILIP KUMAR
NTPC Ltd.

2. SAMPLING LINES OF STEAM WATER CYCLE
1. DM MAKEUP WATER
2. CONDENSATE WATER
3. CPU OUTLET WATER
4. FEED WATER
5. BOILER DRUM WATER
6. SATURATED STEAM WATER
7. MAIN STEAM WATER
8. DEAERATOR OUTLET WATER

3. DM WATER REDUCTION FROM SAMPLING LINES
Each sampling line having average flow 0.5
liters/min
Total water reduction from steam water
cycle/unit/min is 8 × 0.5 = 4.0 liters
Total water reduction / unit/hour = 60 × 4
=240 L
Total water reduction / unit/day = 240 × 24
=5760 L
Total water reduction / unit/month = 5760 ×
30 =172800 L
Total water reduction /month from stage-II =
172800 × 3 =518400 L =518.400 M3
Total water reduction /year from stage-II =
518.400 × 12 =6220.8 m3

4. DM WATER WASTE FROM SWAS STAGE-II
TOTAL SAMPLING LINES AT SWAS PANEL = 27
TOTAL SAMPLING LINES EXCEPT BOILER & CONDENSE
COOLING WATER= 21
No. OF LOCAL SAMPLING LINES=12
TOTAL SAMPLING LINES= 33
AVERAGE FLOW OF EACH SAMPLING LINES=0.5 L/MIN
TOTAL DM WATER WASTAGE =
0.5×33×60×24×30=712800L/MONTH
= 712.8 M3/MONTH

5. DM WATER WASTE FROM SWAS STAGE-I
TOTAL SAMPLING LINES AT SWAS PANEL = 29
TOTAL SAMPLING LINES EXCEPT BOILER = 25
No. OF LOCAL SAMPLING LINES=12
TOTAL SAMPLING LINES= 37
AVERAGE FLOW OF EACH SAMPLING LINES=0.5
L/MIN
TOTAL DM WATER WASTAGE =
0.5×37×60×24×30=799200 L/MONTH
= 799.2 M3/MONTH

6. DM WATER WASTE FROM SWAS STAGE-I&II
TOTAL DM WATER WASTAGE FROM STAGE-I
= 0.5×37×60×24×30=799200 L/MONTH
= 799.2 M3/MONTH
TOTAL DM WATER WASTAGE FROM STAGE-II
=0.5×33×60×24×30=712800L/MONTH
= 712.8 M3/MONTH
TOTAL AVERAGE DM WATER WASTE FROM KhSTPS
= 1512.0 M3/MONTH

7. ADVANTAGE OF CONSERVATION OF DM WATER
1.LOW AMMONIA CONSUMPTION DURING FEED OF CONSERVED DM
WATER
2.REDUCTION IN HCl CONSUMPTION (3.72 M3/MONTH)
3.REDUCTION IN NaOH CONSUMPTION (615 Kg/MONTH)
4.REDUCTION IN EFFLUENT FROM DM PLANT DURING
REGENERATION OF DM STREAMS (750M3/MONTH)
5.REDUCTION OF MAIN PLANT EFFLUENTS (1500M3/MONTH)
6.TIME SAVING IN THE REGENERATION AND SERVICE (24 HOURS)