WO1998036217A1 - Coal-fired steam power plant - Google Patents

Coal-fired steam power plant Download PDF

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Publication number
WO1998036217A1
WO1998036217A1 PCT/EP1998/000828 EP9800828W WO9836217A1 WO 1998036217 A1 WO1998036217 A1 WO 1998036217A1 EP 9800828 W EP9800828 W EP 9800828W WO 9836217 A1 WO9836217 A1 WO 9836217A1
Authority
WO
WIPO (PCT)
Prior art keywords
steam
power plant
coal
feedwater
preheater
Prior art date
Application number
PCT/EP1998/000828
Other languages
French (fr)
Inventor
Armin Drosdziok
Volker Kefer
Gerald Twarloh
William J. Peet
Roger A. Clocker
Original Assignee
Siemens Aktiengesellschaft
The Babcock & Wilcox Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft, The Babcock & Wilcox Company filed Critical Siemens Aktiengesellschaft
Publication of WO1998036217A1 publication Critical patent/WO1998036217A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/36—Water and air preheating systems
    • F22D1/38—Constructional features of water and air preheating systems

Definitions

  • the invention relates to a coal-fired steam power plant having a steam turbine connected to a steam generator through a condensate and feedwater course.
  • Such a steam power plant is used to generate electrical energy. To that end, by burning pulverized coal and supplying preheated air, hot flue gas is generated which has a heat content that is transferred to a medium carried in a water-steam loop. The steam being produced is expanded, performing work, in a steam turbine connected into the water- steam loop, and the turbine drives a generator. In order to increase the efficiency of the steam power plant, it is usual to supply preheated feedwater to the steam generator. However, the preheater heating surfaces required therefor involve considerable engineering effort and expense.
  • a coal-fired steam power plant comprising a steam turbine; a steam generator; and a condensate and feedwater course connecting the steam turbine to the steam generator, the condensate and feedwater course including a preheater heating surface and an air preheater both disposed in the steam generator.
  • the invention is based on the concept that the highest possible degree of prefabrication should be attained in order to reduce the expense of installing such a plant.
  • the air preheater is an air/steam heat exchanger, and the preheater heating surface is heated with flue gas.
  • a feedwater tank having a steam side communicating with the steam turbine and a waste steam side communicating with the feedwater tank.
  • a feedwater pump unit having a pressure side connected directly to the steam generator.
  • Fig. 1 is a diagrammatic, top-plan view of a steam turbine system according to the invention
  • Fig. 2 is a side-elevational view of the steam turbine system of Fig. 1, as seen along a line II-II in the direction of the arrows ;
  • Fig. 3 is a schematic circuit diagram of a condensate and feedwater course of a coal-fired steam power plant.
  • a steam turbine system 1 which includes a steam turbine 2 with a high-pressure and medium-pressure portion 2a and a low-pressure portion 2b, to which a condenser 4 is connected radially on the downstream side.
  • a preheater unit 6 is disposed on a side of the steam turbine 2 facing the condenser 4.
  • a generator 8 located in the vicinity of the steam turbine 2 can be driven through a shaft 7 of the steam turbine 2.
  • Both the high-pressure and medium-pressure portion 2a and the low-pressure portion 2b of the steam turbine 2 as well as the condenser 4 and the preheater unit 6 and the generator 8 are each constructed as a module and are moreover disposed close with the ground.
  • the term "module” should be understood in this case to mean a connectable, transportable component that can be pre-assembled.
  • Each of the aforementioned modules is mounted on a sledlike structure or skid in a non-illustrated manner and can thus be shifted about especially easily.
  • the steam turbine system 1 is part of a coal-fired steam power plant 20 shown in Fig. 3, which has a high-pressure preheater, in the form of a module 9, that is likewise disposed close or flush with the ground on the side of the steam turbine 2 facing the condenser 4.
  • the steam turbine system 1 is connected to a once-through steam generator of the steam power plant 20.
  • One such once-through steam generator is described, for instance, in co-pending U.S. Patent Application Serial No. (Attorney's Docket No. 5796), entitled "Modular Boiler" and having the same assignee.
  • the steam turbine 2, the condenser 4, the preheater unit 6, the generator 8 and the module 9 are disposed in a common power house or turbine hall 10.
  • the generator 8 is connected through a supply line system 11, into which a switch system 12 is incorporated, to a generator transformer 13 that is disposed outside the turbine hall 10 and serves to transform electrical voltage furnished by the generator 8 to a higher level.
  • Fig. 2 is a side view of the turbine hall 10, showing the disposition of the steam turbine 2, the condenser 4 and the preheater unit 6 close or flush with the floor.
  • the condenser 4 is radially connected to the steam turbine 2 on the downstream side.
  • the condenser 4, that is constructed as a module includes a first condenser element 4a and a second condenser element 4b located above the first. An especially space-saving, compact construction is thus achieved.
  • the preheater unit 6, that is also constructed as a module includes a number of preheater elements 15 disposed in a common support stand or heater rig 14. Each preheater element 15 can be acted upon with bled steam A from the steam turbine 2 through a bled steam duct system 16.
  • the pressure and temperature of the bled steam A are functions of the location, wherever it is, at which the steam turbine 2 is bled.
  • Each preheater element 15 is constructed for a specific pressure range of the bled steam A. Placing the preheater elements 15 in the common heater rig 14 makes it possible to prefabricate the preheater unit 6 as a module. This makes the effort and expense of on-site assembly especially low. In order to even further facilitate assembly of the steam turbine system 1, the module 9 is also mounted on a sled structure or skid.
  • Fig. 3 schematically illustrates the circuitry of the steam power plant 20.
  • the coal-fired steam power plant 20 includes a steam generator 22 which is constructed as a once-through steam generator, for generating steam D for the steam turbine 2.
  • the steam turbine 2 is connected to the once-through steam generator 22 through a condensate and feedwater course 23.
  • the condenser 4 is connected to the low-pressure part 2b of the steam turbine 2.
  • the condenser 4 in turn is connected on the outlet side through a condensate pump 24 to a feedwater tank 26.
  • the steam-heated preheater elements 15 disposed in the common heater rig 14 are incorporated into a condensate line 28 provided between the condensate pump 24 and the feedwater tank 26.
  • the feedwater tank 26 communicates on the outlet side through a feedwater pump unit 29 with the steam generator 22.
  • the feedwater pump unit 29 includes a prepump 30 and a main pump 32.
  • the pumps 30, 32 are driven directly by the shaft 7 of the steam turbine 2.
  • the feedwater pump unit 29 is connected on the pressure side directly to the steam generator 22.
  • an air preheater 34 is disposed in the vicinity of the outlet on the flue gas side.
  • a preheater heating surface 36 is also disposed in the steam generator 22 upstream of the air preheater.
  • the air preheater 34 may be an air/steam heat exchanger which is heatable through a bled steam line 38 connected to the steam turbine 2.
  • the bled steam line discharges into the feedwater tank 26.
  • the preheater heating surface 36 is heated through the use of the flue gas RG in the once-through steam generator 22.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

A coal-fired steam power plant includes a steam turbine (2) connected to a steam generator (22) through a condensate and feedwater course. In order to assure the least possible installation expense, the condensate and feedwater course includes a preheater heating surface (36) that is disposed, in addition to an air preheater (34), in the steam generator.

Description

Description
COAL-FIRED STEAM POWER PLANT
Background of the Invention: Field of the Invention: The invention relates to a coal-fired steam power plant having a steam turbine connected to a steam generator through a condensate and feedwater course.
Such a steam power plant is used to generate electrical energy. To that end, by burning pulverized coal and supplying preheated air, hot flue gas is generated which has a heat content that is transferred to a medium carried in a water-steam loop. The steam being produced is expanded, performing work, in a steam turbine connected into the water- steam loop, and the turbine drives a generator. In order to increase the efficiency of the steam power plant, it is usual to supply preheated feedwater to the steam generator. However, the preheater heating surfaces required therefor involve considerable engineering effort and expense.
Summary of the Invention:
It is accordingly an object of the invention to provide a coal-fired steam power plant, which overcomes the hereinafore-mentioned disadvantages of the heretofore-known devices of this general type and which can be installed with especially little technological effort.
With the foregoing and other objects in view there is provided, in accordance with the invention, a coal-fired steam power plant, comprising a steam turbine; a steam generator; and a condensate and feedwater course connecting the steam turbine to the steam generator, the condensate and feedwater course including a preheater heating surface and an air preheater both disposed in the steam generator.
The invention is based on the concept that the highest possible degree of prefabrication should be attained in order to reduce the expense of installing such a plant.
This can be attained in turn by reducing the number of components which are required. Such a reduction is attainable through the use of suitable integration.
In accordance with another feature of the invention, the air preheater is an air/steam heat exchanger, and the preheater heating surface is heated with flue gas.
In accordance with a further feature of the invention, there is provided a feedwater tank, the air preheater having a steam side communicating with the steam turbine and a waste steam side communicating with the feedwater tank.
In accordance with a concomitant feature of the invention, there is provided a feedwater pump unit having a pressure side connected directly to the steam generator.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in a coal-fired steam power plant, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims . The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings .
Brief Description of the Drawings:
Fig. 1 is a diagrammatic, top-plan view of a steam turbine system according to the invention;
Fig. 2 is a side-elevational view of the steam turbine system of Fig. 1, as seen along a line II-II in the direction of the arrows ; and
Fig. 3 is a schematic circuit diagram of a condensate and feedwater course of a coal-fired steam power plant.
Description of the Preferred Embodiments:
Referring now in detail to the figures of the drawings, in which the same elements are identified by the same reference numerals, and first, particularly, to Fig. 1 thereof, there is seen a steam turbine system 1 which includes a steam turbine 2 with a high-pressure and medium-pressure portion 2a and a low-pressure portion 2b, to which a condenser 4 is connected radially on the downstream side. A preheater unit 6 is disposed on a side of the steam turbine 2 facing the condenser 4. A generator 8 located in the vicinity of the steam turbine 2 can be driven through a shaft 7 of the steam turbine 2.
Both the high-pressure and medium-pressure portion 2a and the low-pressure portion 2b of the steam turbine 2 as well as the condenser 4 and the preheater unit 6 and the generator 8 are each constructed as a module and are moreover disposed close with the ground. The term "module" should be understood in this case to mean a connectable, transportable component that can be pre-assembled. Each of the aforementioned modules is mounted on a sledlike structure or skid in a non-illustrated manner and can thus be shifted about especially easily.
The steam turbine system 1 is part of a coal-fired steam power plant 20 shown in Fig. 3, which has a high-pressure preheater, in the form of a module 9, that is likewise disposed close or flush with the ground on the side of the steam turbine 2 facing the condenser 4. The steam turbine system 1 is connected to a once-through steam generator of the steam power plant 20. One such once-through steam generator is described, for instance, in co-pending U.S. Patent Application Serial No. (Attorney's Docket No. 5796), entitled "Modular Boiler" and having the same assignee. The steam turbine 2, the condenser 4, the preheater unit 6, the generator 8 and the module 9 are disposed in a common power house or turbine hall 10.
The generator 8 is connected through a supply line system 11, into which a switch system 12 is incorporated, to a generator transformer 13 that is disposed outside the turbine hall 10 and serves to transform electrical voltage furnished by the generator 8 to a higher level.
Fig. 2 is a side view of the turbine hall 10, showing the disposition of the steam turbine 2, the condenser 4 and the preheater unit 6 close or flush with the floor. The condenser 4 is radially connected to the steam turbine 2 on the downstream side. The condenser 4, that is constructed as a module, includes a first condenser element 4a and a second condenser element 4b located above the first. An especially space-saving, compact construction is thus achieved. The preheater unit 6, that is also constructed as a module, includes a number of preheater elements 15 disposed in a common support stand or heater rig 14. Each preheater element 15 can be acted upon with bled steam A from the steam turbine 2 through a bled steam duct system 16. The pressure and temperature of the bled steam A are functions of the location, wherever it is, at which the steam turbine 2 is bled. Each preheater element 15 is constructed for a specific pressure range of the bled steam A. Placing the preheater elements 15 in the common heater rig 14 makes it possible to prefabricate the preheater unit 6 as a module. This makes the effort and expense of on-site assembly especially low. In order to even further facilitate assembly of the steam turbine system 1, the module 9 is also mounted on a sled structure or skid.
Fig. 3 schematically illustrates the circuitry of the steam power plant 20. The coal-fired steam power plant 20 includes a steam generator 22 which is constructed as a once-through steam generator, for generating steam D for the steam turbine 2. The steam turbine 2 is connected to the once-through steam generator 22 through a condensate and feedwater course 23. The condenser 4 is connected to the low-pressure part 2b of the steam turbine 2. The condenser 4 in turn is connected on the outlet side through a condensate pump 24 to a feedwater tank 26. The steam-heated preheater elements 15 disposed in the common heater rig 14 are incorporated into a condensate line 28 provided between the condensate pump 24 and the feedwater tank 26.
The feedwater tank 26 communicates on the outlet side through a feedwater pump unit 29 with the steam generator 22. The feedwater pump unit 29 includes a prepump 30 and a main pump 32. The pumps 30, 32 are driven directly by the shaft 7 of the steam turbine 2. The feedwater pump unit 29 is connected on the pressure side directly to the steam generator 22.
In the steam generator 22, an air preheater 34 is disposed in the vicinity of the outlet on the flue gas side. A preheater heating surface 36 is also disposed in the steam generator 22 upstream of the air preheater. The air preheater 34 may be an air/steam heat exchanger which is heatable through a bled steam line 38 connected to the steam turbine 2. The bled steam line discharges into the feedwater tank 26. The preheater heating surface 36 is heated through the use of the flue gas RG in the once-through steam generator 22.

Claims

Claims
1. A coal-fired steam power plant, comprising:
a steam turbine;
a steam generator; and
a condensate and feedwater course connecting said steam turbine to said steam generator, said condensate and feedwater course including a preheater heating surface and an air preheater both disposed in said steam generator.
2. The coal-fired steam power plant according to claim 1, wherein said air preheater is an air/steam heat exchanger, and said preheater heating surface is heated with flue gas.
3. The coal-fired steam power plant according to claim 2, including a feedwater tank, said air preheater having a steam side communicating with said steam turbine and a waste steam side communicating with said feedwater tank.
4. The coal-fired steam power plant according to claim 1, including a feedwater pump unit having a pressure side connected directly to said steam generator.
PCT/EP1998/000828 1997-02-14 1998-02-13 Coal-fired steam power plant WO1998036217A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US79915297A 1997-02-14 1997-02-14
US08/799,152 1997-02-14

Publications (1)

Publication Number Publication Date
WO1998036217A1 true WO1998036217A1 (en) 1998-08-20

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PCT/EP1998/000828 WO1998036217A1 (en) 1997-02-14 1998-02-13 Coal-fired steam power plant

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE491390C (en) * 1925-04-03 1930-02-10 Aeg Boiler system for pulverized coal firing with a boiler located above the combustion chamber and with a feed water and air preheater connected in series with the flue gas side in a downward path of the flue gases
GB656555A (en) * 1947-12-19 1951-08-29 Babcock & Wilcox Ltd Improvements in tubulous boiler installations
US2743583A (en) * 1950-04-22 1956-05-01 Foster Wheeler Corp Heat exchange system for power generators
GB948272A (en) * 1961-03-02 1964-01-29 Zd Y Vitezneho Unora Narodni P Improvements in or relating to steam generators
WO1992022733A1 (en) * 1991-06-18 1992-12-23 Abb Carbon Ab A method and a device for controlling output of power between a gas and a steam turbine in connection with a pfbc process
WO1994019645A1 (en) * 1993-02-19 1994-09-01 Imatran Voima Oy Method in small-power plant use

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE491390C (en) * 1925-04-03 1930-02-10 Aeg Boiler system for pulverized coal firing with a boiler located above the combustion chamber and with a feed water and air preheater connected in series with the flue gas side in a downward path of the flue gases
GB656555A (en) * 1947-12-19 1951-08-29 Babcock & Wilcox Ltd Improvements in tubulous boiler installations
US2743583A (en) * 1950-04-22 1956-05-01 Foster Wheeler Corp Heat exchange system for power generators
GB948272A (en) * 1961-03-02 1964-01-29 Zd Y Vitezneho Unora Narodni P Improvements in or relating to steam generators
WO1992022733A1 (en) * 1991-06-18 1992-12-23 Abb Carbon Ab A method and a device for controlling output of power between a gas and a steam turbine in connection with a pfbc process
WO1994019645A1 (en) * 1993-02-19 1994-09-01 Imatran Voima Oy Method in small-power plant use

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