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ST Exhaust Pressure vs. Condenser Design Parameters

ST Exhaust Pressure vs. Condenser Design Parameters

ST Exhaust Pressure vs. Condenser Design Parameters

(OP)
This topic came up as a point of discussion among the engineers in my company.

We are looking at suitable parameters for the steam turbine exhaust pressure vs. air cooled condenser design ambient temperature operating in a desert environment. Estimated steam flow is ~200ton/hr, 400 deg. C and 41 barA, and electricity generated ~36-40MW depending on the exhaust pressure.

I Googled and found: http://www.energy.ca.gov/reports/2002-07-09_500-02-079F.PDF  It provided good case studies.

Table 4.1 (Page 4-8) presents the site conditions; Table 5-9 (pg 5-31) design parameters; Table 5-10 (pg 5-33) Operating Hours above design turbine back pressure.

My question: Without going into the detailed economics (as do not have the sale price of electricity and equipment costs right now) how can I use Table 5-9 and Table 5-10 and select a reasonable turbine exhaust pressure and achieve an optimal ACC size without always having a high back pressure and causing high back pressure alarms and/or trips?

What problems can I expect if the turbine trips too often due to inadequate performance of the ACC?

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