Garioni Naval - Model HRSG & WHRB - Exhaust Gas Boilers

• PINCH POINT
• Approach Temperature
• LOAD TURNDOWN & CONTROL
• STEAM TEMPERATURE RANGE
• SYSTEM PRESSURE DROPS
• Operating Modes
• Firing Temperatures
• Staggered or inline Tubes
• Parasitic Loads
• Availability / Reliability
• Casing Design
• Material Selection (process and gas sides)

ACCORDING TO HEAT INPUT

• Unifired
• Supplementary Fired
• Fully Fired
• Fresh air fired

ACCORDING TO CIRCULATION

• Natural circulation
• Forced circulation
• Assisted circulation

ACCORDING TO NUMBER OF PRESSURE LEVELS

• Single Pressure / Low or High
• Multiple Pressure / Low or High

ACCORDING TO SOURCE AND HYGIENE

• Biomass, MSW, Solid Fuels, Coals, Prime Mover
• Clean or Dirty

ACCORDING TO PROJECT CONSTRAINTS

• Economy, Emissions, Timelines, Locations

• Combustion System:
• In Duct Grid Design
• Register Design (In Duct)
• Standards: EN-12952/NFPA/IRI/FMPitch
• Packaged Fuel Skids
• Scope Includes:
• Combustion Air Blower With Seal Air Damper for Fresh Air Firing.
• Silencer is Standard. (Standard Inverter Rated Motor/Optional VSD)
• Burner Management / Combustion Control System

• (S) Double Door Enclosure w/ Indipendent MCC & PLC Section
• (IP/NEMA) ; (IP 54/55 or IP 40 or Ex-Proof) a (O) Purge Control Unit (Ex-Proof)
• (S) Panel Air Conditioning Unit
• (S) UPS for PLC Control Section
• (S) BMS Interlocked with PLC
• (S) Touch Screen Control Panel With PLC (Optional Fail Safe PLC)
• (S) DCS/SCADA Communication Interface (Modbus/Ethernet/Profibus)
• (S) 3-Element Control System
• (S) Flow Metering with trending for Main Fuel, Steam, Feed Water
• (S) De-Salting Drum (Surface) Blow Down Control
• (S) Oxygen Trim (O2) Control (Fired Boilers Only)
• (S) Level Switches Based on Conductivity Probes (in addition to LT/Cap)
• (S) For Heavy Oils (Re-Circulation Control)
• (O) BMS Integrated into PLC (Economic Module)
• (O) Intermittent Blow-Down Control
• (O) Redundant Electro-Mechanical Reserve System (Controllers-Fuji/Yokogawa/Honeywell/Eurotherm)
• (O) De-Superheating Control (Attemperator or Diverging CV), Pressure Control Stations, Combi Stations
• (O) Automatic Soot Blowing Control (Steam or Sonic)

• Control Valves Samson or Arca or Koso / Fisher or Masonlienan
• Transmitters Fuji or Autrol/Ivensys or Honewell/Yokogawa or Rosemount
• Temp. Sensors/TT Comeco or Fuji
• Vortex Meters Krohne or Rheonik
• Gauges Nuvo Fima / Ashcroft
• Switches Danfoss or Sauter or SOR / Mercoid / Ashcroft
• Variable Speed Drives ABB or Yasakawa or Fuji/Danfoss or Schneider/LS Systems
• Level Control Switches Gestra or Mobrey / VYC or RTK / Clark Reliance
• De-Salting Control Gestra or Spirax / VYC or RTK
• Level Indicators Klinger / Bont or Diesse (LP)
• Electrical Devices GE / Terasaki or Green Power /Telemecanique or MG
• PLC System RENU or ICP-DAS (High Ambients)
• Siemens or Allen Bradley or Mitsubishi
• Fixtures & Fittings EU/USA/JapanOxygen Analyzers Ametek
• (Land Instruments)/Fuji/Client Specific
• Valves Kitazawa or Velan / Mival / Valvole Hoffman
• (LP) / DHV or Equiv. (Isolation & Drains)
• Feed Pumps SIHI or KSB (HP) / Grundfoss or Nocchi (LP)
• Dosing Systems LMI (LP) / Doseuro (HP)
• Safety Valves Tyco (Kunkle) / Leser
• Sampling Stations FM (Catch’n’Grab Stations are Standard)
• Fully Automated Water Analysis Stations on Request)

Surface Area Pinch Is Used In Sizing Heat Of The Evap:

• The pinch point is the difference between the saturation temperature and the EVAP exit temperature
• It is desirable to make the pinch point as small as possible without making the cost of the EVAP astronomical

• DIVERTER, DAMPERS, GUILLOTINES, EXPANSION JOINTS
• FLUE GAS DUCTING
• Internal Lined (Insulated) in Carbon Steel With (O) SS Liners
• External Insulated/Uninsulated in Carbon Steel, Corten or Stainless
• DEAERATORS
• Pressurized (Tray or Spray)
• Atmospheric (Spray)
• FEED WATER PUMPS
• Turbine Driven
• Motor Driven
• DOSING SYSTEMS
• STACKS

Main and/or By-Pass External Insulated/Uninsulated/Lined in Carbon Steel, Corten or Stainless

• ELECTRICALS, INSTRUMENTATION AND CONTROLS
• NEMA/IP/Ex-PROOF
• CONTINUOUS EMISSIONS MONITORING SYSTEMS (CEMS)
• LADDERS & PLATFORMS
• AIR & FLUE HEATERS
• FUEL OIL HEATERS AND PUMPING SKIDS
• BLOWDOWN SYSTEMS
• SCR, SNCR, & CO Catalytic System (NOX/SOX CONTROL)
• ERECTION AND COMMISSIONING

• The approach is the difference between the economizer water outlet temperature and the Saturation temperature of the steam. A good approach point is between 15°F – 30°F.
• This temperature will guarantee that no steaming will occur in the economizer section.
• It is not always possible to achieve an approach point in this zone.
• If the saturation temperature is too high, achieving an approach temperature in this zone will lead to a stack outlet temperature well below the dew point, resulting in use of special steels to avoid corrosion.