Gas Turbine Handbook : Principles and Practices

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140 Gas Turbine Handbook: Principles and Practices Figure 9-5. Power augmentation with steam injection. 4NO + 4NH 3 + O 2 ⇒ 4N 2 + 6H 2 O (9-1) 6NO + 4NH 3 ⇒ 5N 2 + 6H 2 O (9-2) 2NO 2 + 4NH 3 + O 2 ⇒ 3N2 + 6H 2 O (9-3) 6NO 2 + 8NH 3 ⇒ 7N 2 + 12H 2 O (9-4) NO + NO 2 + 2NH 3 ⇒ 2N 2 + 3H 2 O (9-5) SCR catalysts are made of titanium, tungsten, and vanadium elements. The factors that affect the SCR design are type of fuel,
Gas Turbine Exhaust Treatment 141 dust loading, exhaust gas conditions, and the required NO x removal efficiency. The efficiency of the SCR can be defined as the quantity of NO x removed divided by the quantity of NO x present in the inlet stream. The SCR reactor consists of the catalysts, housing, and ammonia injection system (Figure 9-6). In most applications the reactor size is larger than the duct size and therefore, diverging/converging transition ducts are used before and after the reactor, respectively. Care should be taken in preparing the physical design of the SCR reactor, particularly with regard to the gas-stream pressure drop. Gas-stream pressure drop in the order of 2 inches (50mm) to 4 inches (100mm) water column are normally acceptable. Anhydrous ammonia is undiluted, pure, liquid ammonia. In this form it is toxic and hazardous. The liquid anhydrous ammonia is expanded through a heater, mixed with air, and injected into the gas turbine exhaust (Figure 9-7). Aqueous ammonia (NH 4 OH) is a mixture of ammonia (30%) and water (70%). Since it is diluted it is less hazardous than anhydrous ammonia. Injecting aqueous ammonia is only slightly more complicated than injecting anhydrous ammonia. A pump is required to move the aqueous ammonia to a vaporizer tank where it is mixed with hot [575°F (300°C) to 850°F (455°C)] air. There the ammonia/water Figure 9-6. Selective catalytic reduction.
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Gas Turbine Handbook: Principles an
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Gas Turbine Handbook: Principles an
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Dedication This book is dedicated t
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Contents PREFACE ..................
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Chapter 13—BOROSCOPE INSPECTION .
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Preface to the Third Edition The ne
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Acknowledgments I wish to thank the
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2 Gas Turbine Handbook: Principles
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Figure 2-3. Courtesy of United Tech
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Appendix A-2 304 Gas Turbine Handbo
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5. Weather Hood Material __________
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Appendix C-6 Air/Oil Cooler Specifi
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9. Drive Requirements A. Hydraulic
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22. Packaging For Shipment Per Spec
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Parameters Units NH 3 CO H 2 CH 4 C
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.055 Parameters Units 1/0 .88/.12 .
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Koppers Foster Blue Coal Gas Winkle
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Gas Turbine Handbook : Principles and Practices

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