Fisher Power Solutions ® Control valves engineered to improve your plant performance.
| Fisher® Power Solutions The Condensate System Condensate Pump Recirculation Valve As one of the most critical pieces of equipment in a power plant, the condenser provides a high vacuum environment where the turbine output and efficiency is maximized and the exhaust is condensed to water. It is a condensate collection point for the steam generator. From the condenser, the condensate flows into the condensate pump and then through the other components in the condensate system.
Fisher® Power Solutions | 7 Deaerator Level Control Valve The deaerator serves many functions in a power plant. Its primary function is to minimize entrained oxygen in the feedwater. It must also provide additional heat to the feedwater flowing to the boiler and store an adequate amount of feedwater to provide sufficient suction head to the feedpump.
| Fisher® Power Solutions The Feedwater System Boiler Feedwater Startup and Regulator Valve In the normal range of plant operation, the boiler feedwater regulator experiences high flow rates with low differential pressure. However, during startup, this valve experiences low flow rates with very high differential pressure, which can cause severe cavitation damage. Some feedwater systems are designed using one valve to handle startup and normal operating conditions.
Fisher® Power Solutions | 9 Boiler Feedpump Recirculation Valve The boiler feedpump recirculation valve faces some of the toughest conditions of any control valve in a power plant. The boiler feedpump takes its suction from the deaerator at relatively low pressure, and increases the pressure to approximately 10% above the main steam pressure. During startup or low load conditions, flow to the boiler may not be adequate to meet the minimum flow requirements of the boiler feedpump.
| Fisher® Power Solutions The Main Steam System Superheat Spray Valve Varying load requirements cause varying steam temperatures. In order to ensure optimum heat rate and to protect the steam turbine, the steam temperature in the superheat sections of the boiler must be controlled. Fisher superheat spray valves accurately control the amount of water injected into the steam attemperator or cooler, providing optimal main steam temperature control and stability.
Fisher® Power Solutions | 11 HP/IP/LP Turbine Bypass Spraywater Valve Turbine bypass spraywater valves serve a similar function to that of the other spraywater valves in a power plant. Rather than precisely controlling temperature, these valves provide adequate water to the desuperheater to bring the steam temperature to near saturation temperature. This occurs when turbine bypass applications are discharging into the condenser.
| Fisher® Power Solutions The Main Steam System HP/IP/LP Turbine Bypass Valve Turbine bypass systems are essential for the flexible operation of combined cycle power plants, as well as large modern coal fired plants. Turbine bypass systems permit operation of the steam generator independently of the turbine during startup, shutdown, and plant upset conditions. They must be adequately sized to meet the needs of normal startup and shutdown, as well as transients.
Fisher® Power Solutions | 13 Deaerator Pegging Steam Valve The deaerator pegging steam valve provides steam that gives positive pressure to the deaerator or IP and LP drum to prevent air from being drawn into the feedwater system during plant start up. Steam from this valve also heats the feedwater. Steam may come from a low pressure package boiler or the plant main steam line. Fisher pegging steam valves ensure pressure reduction and noise attenuation, regardless of steam source.
| Fisher® Power Solutions Sky Vent System Sky Vent Valve Sky vent valves may operate during startup and shutdown of the heat recovery steam generator, bypassing main steam around the steam turbine to the atmosphere. Fisher sky vent valves are engineered to withstand the full pressure drop that occurs as the valve dumps high pressure and temperature steam directly to the atmosphere.
Fisher® Power Solutions | 15 Desuperheaters Ring Style Attemperator As with any superheated steam cycle, the temperature of the superheat needs to be controlled to ensure that it does not exceed the material limits of the steam turbine and boiler. Temperature control is accomplished by use of an attemperator or desuperheater that injects a controlled amount of cooling water into the superheated steam flow.
| Fisher® Power Solutions Desuperheaters Insertion Style Attemperator Fisher insertion style attemperators are designed to work in conjunction with supporting superheat and reheat control valves. Proven Fisher anti-flashing nozzles provide the required amount of water needed for accurate temperature control in the steam turbine and boiler. They are suitable for temperatures up to 593° C (1100° F) and standard pressure classes up to ANSI 2500.
Fisher® Power Solutions | 17 Heater Drain System HP/LP Feedwater Heater Normal Drain Valve Proper functioning of the heater drain system is critical to maintaining optimum heat rate and protecting the turbine from possible water induction. The feedwater heater normal drain valves must provide stable feedwater heater level control.
| Fisher® Power Solutions Fuel Gas System Fuel Control Valve The primary function of the fuel control valve is to provide fuel to the combustion turbine. The challenge of this application is that the fuel control valve must be designed to work in conjunction with other fuel control and air valves supporting operation of the combustion turbine. Depending upon the age and frame size, the number of fuel control valves can vary from one to many and may differ in size.
Fisher® Power Solutions | 19 Capabilities Serving You For the Life of Your Plant If it’s your responsibility to select the right valve for a tough critical power application, you need every advantage you can get. Not just now, but in the future, too. From application expertise to valve repair, you can count on Emerson for quality, service, and expertise for the life of your plant. Application Expertise We understand that control valves are an investment.
Experience our full breadth of reliable Fisher control valves and instruments for your tough power applications. To contact your local sales office, visit www.EmersonProcess.com/Fisher http://www.Facebook.com/FisherValves http://www.YouTube.com/user/FisherControlValve http://www.Twitter.com/FisherValves http://www.LinkedIn.com/groups/Fisher-3941826 © 2012 Fisher Controls International LCC. All rights reserved.
