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03582 PREOPERATIONAL CHEMICAL CLEANING OF HEAT RECOVERY STEAM GENERATORS

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Product Number: 51300-03582-SG
ISBN: 03582 2003 CP
Author: S. MacDonald
Industry: Energy Generation
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Combined-cycle power generation has become very popular for utilities wishing to increase their power production capacity. Compared to conventional coal-fired units, combined-cycle plants are less expensive, easier to install, have a higher efficiency, and, at the time of this study, are less subject to environmental regulations. An integral component of a combined-cycle unit is the heat recovery steam generator (HRSG). Although heat fluxes in an HRSG are typically lower than in a standard boiler, water chemistry issues are just as critical. One topic of extensive discussion among power generating personnel is pre-operational chemical cleaning of HRSGs. Pre-operational cleanings are often recommended to remove lubricants, mill scale, weld spatter, and other debris that would otherwise foul the boiler upon start-up. Chemical cleaning of an HRSG is frequently complicated by the physical lay out of the unit, which may include two or even three steam generating circuits. This may require staged or extended cleaning procedures. This report outlines previous experiences with HRSG pre-operational cleanings and it looks at how cleaning procedures may be improved in the future.
Combined-cycle power generation has become very popular for utilities wishing to increase their power production capacity. Compared to conventional coal-fired units, combined-cycle plants are less expensive, easier to install, have a higher efficiency, and, at the time of this study, are less subject to environmental regulations. An integral component of a combined-cycle unit is the heat recovery steam generator (HRSG). Although heat fluxes in an HRSG are typically lower than in a standard boiler, water chemistry issues are just as critical. One topic of extensive discussion among power generating personnel is pre-operational chemical cleaning of HRSGs. Pre-operational cleanings are often recommended to remove lubricants, mill scale, weld spatter, and other debris that would otherwise foul the boiler upon start-up. Chemical cleaning of an HRSG is frequently complicated by the physical lay out of the unit, which may include two or even three steam generating circuits. This may require staged or extended cleaning procedures. This report outlines previous experiences with HRSG pre-operational cleanings and it looks at how cleaning procedures may be improved in the future.
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The approach to the commissioning of a heat-recovery steam generator in the industry has varied from project to project. One school of thought contends that no chemical cleaning (or minimal) is required. The second school of thought contends that a complete chemical cleaning is required. This report discusses these differences, and a properly designed and well executed cleaning with desired results.
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