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Flue Gas System

The reactor design of the SCR system utilizes a fixed-bed catalyst in a vertical down-flow multi-stage configuration. The SCR reactor is designed to contain sufficient catalyst to meet the NOX guarantee requirement based on the specified inlet NOX. The reactor housing consists of standard plate construction containing stiffeners and structural supports for earthquake, catalyst support, sealing, loading stress, and thermal stress. The externally insulated reactor housing is constructed with a steel casing reinforced and supported by structural steel members. | Sumitomo Corporation for EVNGENCO1 Duyen Hai 3 Extension, 1 x 660 MWnet Power Project 1.1.7 FLUE GAS SYSTEM 1.1.7.1 July 7, 2014 Selective Catalytic Reactor The Selective Catalytic Reduction (SCR) system, shown in Figure 1 below, catalytically reduces boiler flue gas nitrogen oxide (NOX) emissions to nitrogen and water using ammonia (NH3) as a reducing agent. Figure 1: Typical Selective Catalytic Reduction system for NOX emission reduction The design of the SCR NOX removal system is based on the following major considerations: Selection of catalyst type and pitch to "best match" NOX reduction requirements to process conditions as specified. Equipment/parameter selection to maximize surface contact between flue gas and catalyst to promote B&W Proposal P-043049 PROPRIETARY AND CONFIDENTIAL Copyright © 2014 Babcock & Wilcox Power Generation Group, Inc. All rights reserved Page 1 of 9 Sumitomo Corporation for EVNGENCO1 Duyen Hai 3 Extension, 1 x 660 MWnet Power Project July 7, 2014 NOX reduction reactions. Process refinements to maximize ammonia utilization while maintaining a low gas side pressure drop and required NOX removal efficiency. A reactor design which will allow the use of most available catalyst types. In the presence of the proposed catalyst, the following, typical reactions occur at economizer outlet temperatures: (1) Reduction of NO 4 NO + 4 NH3 + O2 => 4 N2 + 6 H2O (2) Reduction of NO2 6 NO2 + 8 NH3 => 7 N2 + 12 H2O 2 NO2 + 4 NH3 + O2 => 3 N2 + 6 H2O Process System Description The SCR system being proposed is comprised of subsystems designed and integrated to accomplish the specified objectives. These subsystems include: - SCR reactor(s) with associated flue work Catalyst cleaning devices Ammonia (anhydrous) dilution and feed control Ammonia multi-zone mixing and injection system Catalyst loading system All subsystems are equipped with the required controls and interlocks. Preliminary process and design details .