From Steam Plant Operation, Eighth Edition

Overview

Pumps are used for many purposes and a variety of services: for general utility service, cooling water, boiler feed, and lubrication; with condensing water and sumps; as booster pumps, etc. There is a pump design best suited to each purpose and individual service.

Turbines and boilers have increased in size, requiring larger boiler feed pumps. Many of today s utility boilers operate above the super-critical pressure of 3206 psi. With increased pump reliability, many generating stations use fewer pumps, perhaps a single pump for each boiler-turbine unit. Steam-turbine-driven pumps are often used as compared with motor-driven pumps. The steam-turbine drive s advantages are (1) decreased electric power consumption, (2) ideal speed operation with the elimination of hydraulic couplings, and (3) exhaust steam that can be used to improve the station heat balance.

Although there are a variety of pumps found in a power plant, the basic steam power plant cycle includes a combination of a condensing and a feedwater heating cycle, and this requires a minimum of three pumps:

  1. A condensate pump that transfers the condensate from the condenser hot well into the deaerator

  2. A boiler feed pump that transfers feedwater from the feedwater heaters to the economizer or the boiler steam drum

  3. A circulating water pump that provides cooling water through the condenser to condense the exhaust steam from the turbine

Pumps that are found in power plants come in a variety of sizes and designs that depend on the fluid and the service.

Copyright The McGraw-Hill Companies, Inc. 2005 under license agreement with Books24x7

Products & Services
Economizers
Economizers are mechanical devices that are designed to reduce energy consumption, or to perform other useful, energy-related functions (such as preheating fluids).
Steam and Gas Turbines
Steam turbines and gas turbines are rotating machines that extract energy from pressurized steam and/or from combustion gases.
Boilers (industrial)
Industrial boilers are closed vessels that use a fuel source or electricity to heat water or generate steam for industrial heating and humidification applications.
Utility Pumps
Utility pumps are used in many applications such as dewatering low-lying areas, pool covers, and sumps. They are not designed for continuous use.  
Turbine Pumps
Turbine pumps are centrifugal pumps that use pressure in combination with a rotary mechanism to transfer fluid.  They typically employ blade geometry, which causes fluid circulation around the vanes to add pressure from inlet to outlet. 

Topics of Interest

9.1 Steam Turbines A heat engine is one that converts heat energy into mechanical energy. The steam turbine is classified as a heat engine, as are the steam engine, the internal combustion engine,...

Introduction The preboiler system of a typical utility steam generating unit (Fig. 2-1) includes a steam surface condenser, several closed tube-in-shell feedwater heaters, a deaerating feedwater...

Section 1: Modern Power-Plant Cycles and Equipment Section 2: Steam Condensing Systems and Auxiliaries Section 3: Combustion Section 4: Steam Generation Equipment and Auxiliaries Section 5:...

This white paper shows how dealkalization of boiler feedwater improves boiler steam/condensate systems reliability, fuel savings, and chemical savings. The Return of Investment, ROI, is substantially...

OVERVIEW Steam turbines are some of the most common drives for centrifugal compressors. In chemical plants, steam turbines are widely used, due to the fact that most of these plants need steam or...