housings together with new, larger motors to increase capacity.
•Repair regenerative air preheater seals to maintain leakage at 12 percent or less.
•Upgrade coal pulverizers by replacing existing static classifiers with dynamic classifiers to obtain better coal fineness and thus reduce
unburned carbon in the fly ash. In addition, replace existing integral, table-type, volumetric coal feeders with posimetric, calculated-weight-type coal feeders.
• New, larger-capacity safety valves.
•New, larger-capacity boiler drum internals.
• Make pressure part design changes
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• Large-Diameter Conduit
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to reduce boiler back pass flue gas velocities.
The significant recommendations and modifications to the balance-of-plant systems to support the generation output increase of around 40 percent by each unit included the following.
• The two existing 100 percent (each) direct motor-driven boiler feed pumps needed replacement with larger boiler feed pumps and motors to reduce high auxiliary power usage when both pumps need to be operated in parallel to provide sufficient feedwater at higher loads.
•Because of significantly higher feedwater and condensate water flow velocities, a flow accelerated corrosion study was necessary during the project’s detailed engineering design phase. Heater drains needed to be included because of increased two-phase flow.
•Because the plant’s once-through condenser cooling water system used river water, an on-line condenser tube cleaning system was recommended to remove the sludge build-up that normally occurs and that requires periodic manual cleanings. Keeping the condenser tubes clean would consistently decrease condenser pressures and thus decrease heat rate. Cleaning also would increase generation capability, especially during the summer when river water temperatures approach 90 F.
• Replacement of the expansion joint in the extraction steam line to LP Heater No. 3 was necessary because of higher extraction steam pressures caused by the HP/IP turbine retrofi t.
• One unit generator needed upgrading from non-direct field cooling to direct (air) field cooling to increase its generating capacity.
Distribution
• Maxx-Trak TM Cable Placing Equipment
• Cable-in-Conduit
• Smooth-Cor® Flexible Conduit System
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The client is adding a flue gas desulphurization system to its two-unit, coal-fired, 1,300 M W electric generating station, causing auxiliary power to increase. To offset the additional power
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