Turbine Hotwell Temp

Without seeing the plant, it's difficult to say. Any chance of posting the P&ID?

Dear Mr. Lalit Shukla,

What is the Vaccuum obtained in the Condenser. It appears the vaccuum will be around 0.8 Kg/CM^2, as against 0.9 and more. Kg/M^2. Pl. post the P and I Diagram.

The other possible reasons for higher temp. of hot well will be due to

1. Less Circulation of Cooling Water to the Condenser.-,

2. Heavy scaling in the Condenser Tubes, which will reduce the OVER-ALL HEAT TRANSFER Co.Efficient.

3. Leakage of Atmospheric Air - is another source of Low Vacc. problem

thanks,

DHAYANANDHAN.S

Dear Mr. Lalit shukla,

1.Vaccuum of 0.68 Kg/cm^2 to 0.8 Kg/cm^2 is too low and it should be min. of 0.92 Kg/cm^2. The vaccuum creating capacity may be less than the designed value. Higher the vaccuum, higher the output of power per Kg. of steam, this is the BASICS of THERMODYNAMICS. Refer Mollier Chart

2. The Scale thickness of 1 MM is considerable, will retard the Heat Transfer since the scale plays very vital role and single large element to retard the Heat Transfer. The metal and thickness will have less impact than the scale.

Refer the charts for guidance about the Temperature Gradient.

Chart No. 1 is ideal

CHART No. 2 in Practically occuring

A SIMILAR CHART if made means we can identify the problem.

3. Are you using treated/soft water for cooling tower make up.? What is the Blow-down maintained in the cooling tower, i.e. COC. Your water chemist should have decided this aspect. If this is NOT controlled, Scaling in the condenser cannot be avoided. Pl. check this also.

4. If you can post the full operating data, we may zero down to the issue.

Thanks,

DHAYANANDHAN.S

NOTE: 1. The Chart is NOT ATTACHING PROPERLY. CR4 FORUM rules DOES NOT PERMIT asking for personal mail Id./contact details. Use the messaging facility/help provided in the CR4 LINK and and I will send the sketch through that facility.

2. I request CR4 FORUM MEMBERS to help/guide me to HOW TO POST THE SKETCHES which is jpg image and microsoft photo editor image.

Bad sensor?