CN115095898A - Heat supply system economic operation analysis method based on exhaust steam condenser - Google Patents
Heat supply system economic operation analysis method based on exhaust steam condenser Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/002—Central heating systems using heat accumulated in storage masses water heating system
- F24D11/005—Central heating systems using heat accumulated in storage masses water heating system with recuperation of waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
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Abstract
The invention provides a heat supply system economic operation analysis method based on an exhaust steam condenser 2 And the temperature rise delta t of the heat supply circulating water after passing through the exhaust steam condenser, so that the coal saving quantity Q is maximum; the coal saving quantity calculation formula is Q ═ k × Q 1 ‑E*(P‑P s )*y*10 ‑3 . The invention can save energy to the maximum extent and realize the maximum benefit on the premise of meeting the heat demand of users.
Description
Technical Field
The invention relates to the field of economic operation analysis of a heating system of a coal-fired power plant, in particular to a heating system economic operation analysis method based on an exhaust steam condenser.
Background
The heat supply network process is that a heat source of a power plant passes through a heat supply long transmission network, after heat exchange is carried out through a pressure isolation station, the heat source is transmitted to a primary network, and then the primary network further exchanges heat to a secondary network through a community heat exchange station, and finally enters a user. The flow chart is shown in fig. 1. And (4) the personnel in the pressure isolation station make requirements on the temperature and flow parameters of the power plant according to the actual supply and return water temperature and operation experience in the cell. The empirical adjustment method cannot save energy to the maximum extent and maximize the benefit of the power plant.
In a condensing steam turbine, steam is discharged into a condenser after the turbine has performed work, and the steam reaching the condenser is generally called exhaust steam. The condenser has the following three main functions:
1) the higher vacuum is formed at the steam outlet of the steam turbine, so that the steam is expanded to the lowest pressure in the steam turbine, the available enthalpy drop of the steam in the steam turbine is increased, and the circulating heat efficiency of the steam turbine is improved.
2) The exhaust steam of the steam turbine is condensed into water and sent back to the boiler for circulation.
3) Pooling of various hydrophobes reduces steam water loss.
The back pressure heat supply unit has no cold source loss, the thermodynamic cycle efficiency can reach 80 percent, and is far higher than the thermal efficiency of about 40 percent of the straight condensing unit, so the back pressure heat supply unit has inherent advantages in the aspects of power generation and heat supply cost, but the characteristics of the back pressure heat supply unit also determine that the power generation load of the unit is limited by the heat supply load. The power generation load and the heat load of the extraction condensing unit can be flexibly switched, but because of the loss of a cold source, when the heat supply load is low, the power generation coal consumption is high, and taking a certain 300MW extraction condensing unit of a thermal power plant as an example, the full-power heat supply working condition is 90 g/kW.h higher than the pure condensing working condition power supply coal consumption. Under the current market environment with high coal price, the pure condensing working condition has high power generation cost. Therefore, when the load demand of the heat supply network is lower than the rated heat supply capacity of the thermal power plant, how to distribute the heat and electricity loads of the back pressure machine and the extraction condensing machine has a great influence on the whole plant economy and the whole plant profit.
In the prior art, Hongqing published ' analysis of heat supply distribution economy of a back pressure machine and a condensing machine of a thermal power plant ' in the 5 th year 2021 of power system equipment ', a thermoelectric enterprise in a certain large industrial concentration area in Zhejiang has a 2 × 300MW coal-fired condensing heat supply unit with a rated heat supply of 2 × 410t/h and a 4 × 57MW coal-fired back pressure main pipe heat supply unit with a rated heat supply of 4 × 325 t/h. When the load of the heat supply network is lower than the maximum heat supply capacity of the thermal power plant, the distribution mode of the heat and electricity loads of the extraction condensing unit and the backpressure unit of the thermal power plant directly influences the coal consumption of the units and the total profit of the whole plant. Aiming at the problem, a thermoelectric load distribution scheme with guiding significance is obtained by establishing a set of coal consumption and profit real-time calculation system, carrying out theoretical analysis and carrying out unit adjustment test.
The Chinese patent with the application number of 202110028723.2 discloses a method and a system for measuring, calculating and controlling the economic operation of a power plant, which realize the accurate calculation of the power generation cost of the power plant and the generation of quotation strategies, wherein the method comprises a step of measuring and calculating the cost of electricity price and a step of selecting an operation mode, a set of load benefits at each time point in a preset time period is calculated and obtained according to the cost of electricity price obtained in the step of measuring and calculating the cost of electricity price, then the maximum value of the benefit in the set of the load benefits at the time point is taken, and the maximum value of the benefit is compared with the starting cost; and when the maximum benefit value is a negative number and the sum of the maximum benefit value and the starting cost is less than zero, entering a peak shaving mode, and otherwise, entering a continuous mode. The system comprises an input interface for acquiring unit cost, unit income and generating capacity of each unit, pricing operation logic, a benefit calculation unit, a processing and comparing unit and a mode selection unit for selecting a unit operation mode according to an output result of the processing and comparing unit.
In summary, the problem that the heat supply system is simply and efficiently analyzed to be lacking in economic operation exists in the prior art, and therefore, on the premise that the heat demand of a user is met, how to save energy to the maximum extent and achieve maximum benefit is the direction of urgent research.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the heat supply system economic operation analysis method based on the dead steam condenser, which can save energy to the maximum extent and realize the maximum benefit on the premise of meeting the heat demand of users.
The technical scheme adopted by the invention is as follows: in the heating season, the flow Q of the heating circulating water passing through the exhaust steam condenser is adjusted 2 And the temperature rise delta t of the heat supply circulating water after passing through the exhaust steam condenser, so that the coal saving quantity Q is maximum; the coal saving quantity calculation formula is Q ═ k × Q 1 -E*(P-P s )*y*10 -3 。
Further, in a coal saving amount calculation formula, Q is the coal saving amount and is a unit of t/h; k is the unit of the utilization amount of the dead steam, the coal amount is saved, and the unit t/h is the unit; e is unit load and unit MW; p is unit backpressure, unit kPa; p s The unit reference back pressure is the unit reference back pressure in kPa when the exhaust steam condenser is not put into the unit; y is the variation of the coal consumption of the power generation influenced by the backpressure variation 1Kpa, and the unit is g/(kw.h); q 1 The unit is the utilization amount of dead steam, namely t/h.
Further, the exhaust steam utilization amount Q 1 Is calculated by the formula
Further, the exhaust steam utilization amount Q 1 In the calculation formula, delta t is the temperature rise of the heat supply circulating water after passing through the exhaust steam condenser, and the unit is; q 2 The unit t/h is the flow of the heat supply circulating water passing through the exhaust steam condenser; delta J is the heat released by condensing the unit dead steam amount into water under the same backpressure, and the unit kJ/kg; c is the specific volume of water.
Further, the formula for y is that y is ax 2 + bx + c, x is the electrical load, unit MW; a. b and c are coefficients.
Further, a calculation formula of y is obtained through polynomial fitting.
Furthermore, the heating system based on the exhaust steam condenser comprises a heat supply network initial station and a pressure isolation station connected with the heat supply network initial station, a water supply pipe and a water return pipe are arranged between the heat supply network initial station and the pressure isolation station, the exhaust steam condenser is arranged on the water return pipe, and the exhaust steam condenser is further connected with a steam turbine steam exhaust device and a low-pressure cylinder.
Furthermore, the low-pressure cylinder is connected with the exhaust steam condenser through a first exhaust steam pipeline, and the exhaust steam condenser is connected with the steam exhaust device of the steam turbine through a drain pipeline of the exhaust steam condenser; a second steam exhaust pipeline is connected between the low-pressure cylinder and the power plant air cooling device; and an air cooling island drainage pipeline is connected between the power plant air cooling device and the steam turbine steam exhaust device.
Furthermore, the water supply pipe and the water return pipe are both long transmission nets.
Further, the heat supply network head station is also connected with an extraction steam turbine.
The invention has the beneficial effects that:
in the season of heat supply, the purposes of saving energy and maximizing benefit as far as possible can be achieved by adjusting the flow and temperature of the heat supply circulating water to maximize the coal saving amount.
The invention takes the unit characteristics as theoretical support, combines with actual operation data, establishes a coal saving index and is used for measuring the utilization rate of the exhaust steam condenser.
Analyzing and comparing big data operated in the past year, and finding t when the Q is the maximum value under the condition of the same heat demand Into Flow rate for directed heating economy adjustment.
On the premise of meeting the heat demand of a user, the invention can save energy to the maximum extent and realize the maximum benefit.
Drawings
FIG. 1 is a schematic diagram of a heat exchange system in the prior art;
FIG. 2 is a schematic connection diagram of a heating system based on an exhaust steam condenser according to the present invention;
FIG. 3 is a schematic diagram of the connection of the exhaust steam condenser, the heat supply network initial station and the pressure isolation station according to the present invention;
FIG. 4 is a schematic diagram of the connection of the exhaust steam condenser, the low-pressure cylinder and the air cooling device of the power plant.
In the attached drawing, 1 a heat supply network first station, 2 water supply pipes, 3 pressure isolation stations, 4 steam exhaust condensers, 5 low-pressure cylinders, 6 power plant air cooling devices, 7 water return pipes, 8 first steam exhaust pipelines, 9 steam exhaust condenser steam drain pipelines, 10 steam extraction type turbines, 11 second steam exhaust pipelines, 12 air cooling island steam drain pipelines and 13 steam turbine steam exhaust devices.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted at the outset that the discussion of any embodiment of the present invention is merely exemplary in nature, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; there are many other variations of the different aspects of the invention as described above which are not provided in detail for the sake of brevity. Accordingly, other embodiments are within the scope of the following claims.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.
In addition, the drawings in the following description are only preferred embodiments of the present invention, and it is obvious to those skilled in the art that other drawings can be obtained based on the drawings without inventive efforts. In addition, the present invention is not limited to these embodiments, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Example 1
As will be appreciated with reference to fig. 2-4, the present embodiment provides a method for analyzing the economic operation of a heating system based on a steam exhaust condenser.
When the power plant has two heat supply modes of steam extraction heat supply of a steam turbine and high back pressure heat supply of an air cooling unit, the high back pressure heat supply is utilized to the maximum extent, when the high back pressure heat supply can not meet the temperature requirement, the steam turbine is put into use for steam extraction heating, so that the optimal flow and temperature value are found on the premise of the same heat requirement, and the utilization rate of the dead steam condenser is the highest.
In order to maximize the utilization rate of the exhaust steam condenser, the coal saving index is established as long as the coal saving amount is maximized.
In the heating season, the flow Q of the heating circulating water passing through the exhaust steam condenser is adjusted 2 And the temperature rise delta t of the heat supply circulating water after passing through the exhaust steam condenser, so that the coal saving quantity Q is maximum; the coal saving quantity calculation formula is Q ═ k × Q 1 -E*(P-P s )*y Q＝k*Q 1 -E*(P-P s )*y*10 -3 。
In the coal saving amount calculation formula, Q is the coal saving amount and has a unit of t/h; k is the unit of the utilization amount of the dead steam, the coal amount is saved, and the unit t/h is the unit; e is unit load, unit MW; p is unit backpressure, unit kPa; p is s The unit kPa is the unit reference backpressure when the exhaust steam condenser is not put into the unit and can be set according to the actual situation; y is the variation of the coal consumption of the power generation influenced by the backpressure variation 1Kpa, and the unit is g/(kw.h); q 1 The unit is the utilization amount of dead steam, namely t/h.
Exhaust steam utilization amount Q 1 Is calculated by the formula
Exhaust steam utilization amount Q 1 In the calculation formula, delta t is the temperature rise of the heat supply circulating water after passing through the exhaust steam condenser, and the unit is; q 2 The unit of t/h is the flow of the heat supply circulating water passing through the exhaust steam condenser; delta J is the heat released by condensing the unit dead steam amount into water under the same backpressure, and the unit kJ/kg; c is the specific volume of water.
The back pressure change 1Kpa influences the calculation formula of the coal consumption of power generation: y is ax 2 + bx + c, which can be obtained by polynomial fitting of the big data,wherein x is the electrical load in MW; a. b and c are coefficients.
And obtaining a calculation formula of y through polynomial fitting.
In the heating season, the purposes of saving energy and maximizing the benefit can be achieved by adjusting the flow and the temperature of the heating circulating water to maximize the coal saving amount.
Example 2
Referring to fig. 2, the heat supply system based on the exhaust steam condenser in the method for analyzing the economic operation of the heat supply system based on the exhaust steam condenser comprises a heat supply network initial station 1 and a pressure insulation station 3 connected with the heat supply network initial station 1, wherein a water supply pipe 2 and a water return pipe 7 are arranged between the heat supply network initial station 1 and the pressure insulation station 3, heat supply circulating water in the heat supply network initial station 1 is input into the pressure insulation station 3 through the water supply pipe 2, and the used heat supply circulating water flows into the heat supply network initial station 1 from the pressure insulation station 3 through the water return pipe 7.
And an exhaust steam condenser 4 is arranged on the water return pipe 7, and the exhaust steam condenser 4 is also connected with a steam turbine steam exhaust device 13 and a low-pressure cylinder 5.
The low-pressure cylinder 5 is connected with the exhaust steam condenser 4 through a first exhaust steam pipeline 8, and the exhaust steam condenser 4 is connected with the steam turbine exhaust device 13 through an exhaust steam condenser drain pipeline 9; a second steam exhaust pipeline 11 is connected between the low-pressure cylinder 5 and the power plant air cooling device 6; and an air cooling island drainage pipeline 12 is connected between the power plant air cooling device 6 and the steam turbine steam exhaust device 13.
The exhaust steam of the low pressure cylinder 5 enters the exhaust steam condenser 4 through a first exhaust steam pipeline 8, and the exhaust steam of the exhaust steam condenser 4 enters a steam turbine exhaust device 13 through an exhaust steam condenser drain pipeline 9.
The condensed water of the low pressure cylinder 5 enters the power plant air cooling device 6 through the second steam exhaust pipeline 11, and the condensed water of the power plant air cooling device 6 enters the steam turbine steam exhaust device 13.
The water supply pipe 2 and the water return pipe 7 are both long transmission nets.
The heat supply network initial station 1 is also connected to a steam extraction turbine 10.
The exhaust steam condenser is connected to the low-pressure cylinder exhaust steam pipeline and connected with the air cooling device (the power plant air cooling device 6) in parallel, the backpressure of the unit can be adjusted by adjusting the fan frequency of the air cooling device, and the temperature of the corresponding exhaust steam condenser outlet heating circulating water is changed accordingly. However, the backpressure of the unit can not be increased without limit, the temperature of the last stage blade of the low-pressure cylinder can not exceed the limit, the backpressure of the unit is too low, the temperature rise of the inlet and the outlet of the exhaust steam condenser is small, and the exhaust steam condenser can not be fully utilized.
Example 3
The method of the present invention is specifically described below.
The best operating data were obtained by screening the data of the past year using the method of the invention, see table 1.
TABLE 1
The highest coal saving corresponds to temperature (deg.C) and flow rate for different instantaneous heat supplies are given in Table 1.
Such as instantaneous heat supply 35-39X 10 4 The highest coal saving under GJ/h corresponds to the temperature of 70-72 ℃ and the flow of 1.05-1.1 multiplied by 10 4 t/h。
The specific process of analysis is as follows:
with instantaneous heat supply (35-39) x 10 4 GJ/h is an example to illustrate the analytical process of the present invention.
The instantaneous heat supply amount is set according to the ambient temperature.
In this experimental example, the instantaneous heat supply amount was set to (35-39). times.10 4 GJ/h。
Firstly, the utilization quantity Q of dead steam is calculated 1 ，
Delta t is the temperature rise of the heat supply circulating water after passing through the exhaust steam condenser, and the unit is; q 2 The unit t/h is the flow of the heat supply circulating water passing through the exhaust steam condenser; Δ J are the sameCondensing the unit steam lacking amount under the back pressure into heat released by water, wherein the unit kJ/kg; c is the specific volume of water.
In this experimental example, constants C and Δ J are substituted, the specific volume C of water is constant 4.18, and Δ J can be obtained by looking up a steam temperature enthalpy table at different pressures and a water enthalpy table corresponding to the temperature. For example, at 30KPa, steam enthalpy 2625KJ/Kg, 69 ℃, corresponds to 69 ℃ water enthalpy 289KJ/Kg, then Δ J2625-.
The formula for y is that 2 + bx + c, x is the electrical load, unit MW; a. b and c are coefficients. And obtaining a calculation formula of y through polynomial fitting. The polynomial fitting process is a well known technique. For example, the fitted formula is y-0.00001120 x 2 0.01365105x +5.16381586, when the load of the unit is 400MW and the back pressure of the unit is changed from 30KPa to 31KPa, the change amount of the coal consumption is 1.4954 after the formula is substituted, namely, the coal consumption is increased by 1.4954 g/(Kw.h).
Coal saving amount calculation formula: q ═ k × Q 1 -E*(P-P s )*y*10 -3 Wherein Q is the coal saving amount, unit t/h; k is the unit of the utilization amount of the dead steam, the coal amount is saved, and the unit t/h is the unit; e is unit load, unit MW; p is unit backpressure, unit kPa; p s The unit kPa is the unit reference backpressure when the exhaust steam condenser is not put into the unit, and can be set according to the actual situation.
For example, when P s Using 10Kpa, y again using the formula in the above example, with a load of 400MW and a maximum backpressure of 35Kpa, k of 0.052, the formula is substituted
When the unit back pressure is 35Kpa, the corresponding exhaust steam condenser outlet temperature is 72 ℃, and the formula is changed into: q-0.0000928888 ═ 72-t Go into )*Q 2 -14.954。
Wherein, t Go into The temperature of the inlet of the exhaust steam condenser.
Delta t is the temperature rise of the heat supply circulating water after passing through the exhaust steam condenser, and the unit temperature delta t is the temperature of the outlet of the exhaust steam condenserInlet temperature t of the device Into 。
Analyzing and comparing big data in the next year of operation, and finding the inlet temperature t of the dead steam condenser when the Q maximum value is achieved under the condition of the same heat demand Go into And flow Q2, further finding the outlet temperature of the first heat supply station corresponding to the inlet temperature of the exhaust steam condenser, and combining the heat supply flow to manufacture an operation adjustment guide card for subsequent heat supply economical efficiency adjustment.
In the season of heat supply, the purposes of saving energy and maximizing benefit as far as possible can be achieved by adjusting the flow and temperature of the heat supply circulating water to maximize the coal saving amount. Because the thermodynamic cycle efficiency of the backpressure heat supply unit is far higher than that of a straight condensing unit, the utilization rate of the dead steam condenser is improved as much as possible to maximize the coal saving amount. The method is supported by taking the unit characteristics as a theory, and the coal saving index is established by combining with actual operation data and is used for measuring the utilization rate of the exhaust steam condenser. And analyzing and comparing the big data operated in the past year, finding the t-input flow when the maximum value of Q is enabled under the condition of the same heat demand, and manufacturing an operation adjustment guide card for guiding the adjustment of the heat supply economy.
The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present invention are included in the scope of the present invention.
Claims (10)
1. The method for analyzing the economic operation of the heat supply system based on the exhaust steam condenser is characterized in that in the heat supply season, the flow Q of the heat supply circulating water passing through the exhaust steam condenser is adjusted 2 And the temperature rise delta t of the heat supply circulating water after passing through the exhaust steam condenser, so that the coal saving quantity Q is maximum; the coal saving quantity calculation formula is Q ═ k × Q 1 -E*(P-P s )*y*10 -3 。
2. The heating system economic operation analysis method based on the exhaust steam condenser according to claim 1, wherein in a coal saving calculation formula, Q is coal saving amount in t/h; k is unit dead steam utilization amount to save coal amount and unit t/h(ii) a E is unit load, unit MW; p is unit backpressure, unit kPa; p is s The unit reference back pressure is the unit reference back pressure in kPa when the exhaust steam condenser is not put into the unit; y is the variation of the coal consumption of the power generation influenced by the back pressure variation 1Kpa, and the unit is g/(kw.h); q 1 The unit is the utilization amount of dead steam, namely t/h.
3. The method for analyzing the economic operation of a heating system based on a dead steam condenser as claimed in claim 1, wherein the utilization amount Q of dead steam 1 Is calculated by the formula
4. The method for analyzing the economic operation of a heating system based on a dead steam condenser as claimed in claim 3, wherein the utilization amount Q of dead steam 1 In the calculation formula, delta t is the temperature rise of the heat supply circulating water after passing through the exhaust steam condenser, and the unit is; q 2 The unit t/h is the flow of the heat supply circulating water passing through the exhaust steam condenser; delta J is the heat released by condensing the unit dead steam amount into water under the same backpressure, and the unit kJ/kg; c is the specific volume of water.
5. The method for analyzing the economic operation of a heating system based on a dead steam condenser as claimed in claim 1, wherein the calculation formula of y is that y is ax 2 + bx + c, x is the electrical load, unit MW; a. b and c are coefficients.
6. The method for analyzing the economic operation of the heating system based on the exhaust steam condenser as recited in claim 5, wherein the calculation formula of y is obtained by polynomial fitting.
7. The method for analyzing the economic operation of the heating system based on the exhaust steam condenser is characterized by comprising a heat supply network initial station (1) and a pressure isolation station (3) connected with the heat supply network initial station (1), wherein a water supply pipe (2) and a water return pipe (7) are arranged between the heat supply network initial station (1) and the pressure isolation station (3), the exhaust steam condenser (4) is arranged on the water return pipe (7), and the exhaust steam condenser (4) is further connected with a steam turbine steam exhaust device (13) and a low-pressure cylinder (5).
8. The method for analyzing the economic operation of the heating system based on the exhaust steam condenser is characterized in that the low-pressure cylinder (5) is connected with the exhaust steam condenser (4) through a first exhaust steam pipeline (8), and the exhaust steam condenser (4) is connected with a steam turbine exhaust device (13) through an exhaust steam condenser drain pipeline (9); a second steam exhaust pipeline (11) is connected between the low-pressure cylinder (5) and the power plant air cooling device (6); and an air cooling island drainage pipeline (12) is connected between the power plant air cooling device (6) and the steam turbine steam exhaust device (13).
9. The method for analyzing the economic operation of the heating system based on the exhaust steam condenser as recited in claim 7, wherein the water supply pipe (2) and the water return pipe (7) are both long transmission networks.
10. The method for analyzing the economic operation of the heating system based on the exhaust steam condenser according to claim 7, wherein the heat supply network head station (1) is further connected with an extraction steam turbine (10). .
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