A system and method for steam supply energy storage peak shaving and frequency modulation of a thermal power plant

Abstract

This application belongs to the technical field of peak shaving and frequency regulation in thermal power plants. Specifically, it proposes a system and method for peak shaving and frequency regulation of steam supply and energy storage in thermal power plants, including: a reheater installed on the boiler (1), with its inlet connected to the high-pressure cylinder (2) and its outlet connected to the intermediate-pressure cylinder (3), used to reheat part of the steam generated by the high-pressure cylinder (2) and then deliver it to the intermediate-pressure cylinder (3); the outlet of the boiler (1) and / or the outlet of the reheater are connected to an external steam supply pipeline, which is used to supply steam to external users; a battery (12), connected to the output end of the generator (5), used to store part of the electrical energy or release the stored electrical energy to the power grid. The amount of main steam extracted from the boiler (1) or reheat steam from the reheater can be adjusted, thereby adjusting the amount and temperature of steam entering the intermediate-pressure cylinder (3) and the low-pressure cylinder (4), controlling the power generation and steam supply, realizing peak shaving and frequency regulation, and at the same time, adjusting the charging rate or the discharge rate of the battery (12) to achieve faster system frequency regulation.

Description

Technical Field

[0001] This application belongs to the technical field of peak shaving and frequency regulation in thermal power plants, and particularly relates to a system and method for peak shaving and frequency regulation of steam supply and energy storage in thermal power plants. Background Technology

[0002] In addition to meeting the needs of power generation, thermal power plants also provide steam or heating for industrial use. How to restructure the thermal power system to meet the needs of peak shaving, frequency regulation and external steam supply has become a concern for technicians. Summary of the Invention

[0003] This application provides a system for steam supply, energy storage, peak shaving, and frequency regulation in a thermal power plant, comprising a boiler, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, and a generator. A main steam pipeline downstream of the boiler is sequentially connected to the high-pressure cylinder, the intermediate-pressure cylinder, and the low-pressure cylinder, which drive the generator. A main return pipeline downstream of the low-pressure cylinder is connected to the boiler, including:

[0004] A reheater is installed on the boiler, with its inlet connected to the high-pressure cylinder and its outlet connected to the intermediate-pressure cylinder. The reheater is used to reheat part of the steam generated by the high-pressure cylinder and then deliver it to the intermediate-pressure cylinder.

[0005] The boiler outlet and / or the reheater outlet are connected to an external steam supply pipeline, which is used to supply steam to external users.

[0006] A battery, connected to the output of the generator, is used to store some electrical energy or to transmit the stored electrical energy to the power grid.

[0007] Furthermore, the system also includes a steam ejector and a desuperheating and pressure reducing device.

[0008] The steam ejector inlet is connected to the boiler outlet and the reheater outlet. The steam ejector outlet is connected to the external steam supply pipeline and the reheater inlet. The steam ejector uses part of the high-temperature and high-pressure main steam produced by the boiler to inject high-temperature and medium-low-pressure reheat steam to form medium-temperature and medium-pressure steam. Part of the medium-low-pressure steam is returned to the reheater, and the other part is transported to the external steam supply pipeline.

[0009] A de-temperature and pressure reducing device is located downstream of the steam ejector and is used to regulate the temperature and pressure of the steam entering the external steam supply pipeline and the reheater after ejection.

[0010] Furthermore, the system also includes a second de-heating and pressure reducing device, the inlet of which is connected to the outlet of the boiler, and the outlet of which is connected to the external steam supply pipeline and the reheater inlet;

[0011] The second de-heating and pressure-reducing device is used to adjust the pressure and temperature of a portion of the main steam produced by the boiler before delivering it to the reheater and the external steam supply pipeline, respectively.

[0012] Furthermore, the system also includes a steam compression device and a desuperheating and pressure reducing device.

[0013] The inlet of the de-cooling and pressure reducing device three is connected to the outlet of the reheater, and is used to cool and depressurize a portion of the reheat steam extracted from the reheater; the outlet of the de-cooling and pressure reducing device three is connected to the inlet of the steam compression device.

[0014] The outlet of the steam compression device is connected to an external steam supply pipeline, which is used to pressurize the de-cooled and de-pressurized steam and supply it to external users.

[0015] Furthermore, a condenser, a condensate pump, a low-pressure heater, a deaerator, a feedwater pump, and a high-pressure heater are sequentially installed on the main return pipe downstream of the low-pressure cylinder.

[0016] Furthermore, a portion of the water supplied from the outlet of the water pump is provided to either the first desuperheating and pressure reducing device or the second desuperheating and pressure reducing device.

[0017] Furthermore, a portion of the condensate from the outlet of the condensate pump is supplied to the desuperheating and pressure-reducing device.

[0018] Another aspect of this application proposes a method for peak shaving and frequency regulation of steam supply and energy storage in thermal power plants, applied to the steam supply and energy storage peak shaving and frequency regulation system of thermal power plants in the above-mentioned technical solution. This method is applicable when the electricity load is low, the thermal power plant requires deep peak shaving, and the reheat steam produced by the reheater does not meet the steam supply needs of external users:

[0019] The high-temperature and high-pressure main steam produced by the boiler is used to induce high-temperature and low-pressure reheat steam to form medium-temperature and low-pressure steam.

[0020] The medium-temperature, medium-low-pressure steam is cooled by using a portion of the feedwater from the outlet of the feedwater pump.

[0021] A portion of the cooled steam is supplied to the reheater, and the other portion is supplied to external users through the external steam supply pipeline.

[0022] Utilizing batteries to store a portion of the electrical energy generated by the generator.

[0023] This application also proposes a method for peak shaving and frequency regulation of steam supply and energy storage in thermal power plants, applied to the steam supply and energy storage peak shaving and frequency regulation system of thermal power plants in the above-mentioned technical solution. When the power load is low, the steam demand of external users increases, and the reheater temperature exceeds the limit:

[0024] Using a portion of the feedwater from the outlet of the feedwater pump, a portion of the high-temperature, high-pressure main steam produced by the boiler is de-temperatureed and de-pressureed.

[0025] After adjusting the steam parameters to reduce temperature and pressure, part of the steam is supplied to the reheater, and the other part is supplied to external users through the external steam supply pipeline.

[0026] Utilizing batteries to store part of the electrical energy produced by generators, or releasing the stored electrical energy back onto the power grid;

[0027] Control the rate at which the battery stores electrical energy and the rate at which it releases electrical energy.

[0028] This application further proposes a method for peak shaving and frequency regulation of steam supply and energy storage in thermal power plants, applied to the steam supply and energy storage peak shaving and frequency regulation system of thermal power plants in the above-mentioned technical solution, when the pressure of reheat steam does not meet the steam supply demand:

[0029] A portion of the condensate from the outlet of the condensate pump is used to de-heat a portion of the reheat steam produced by the boiler.

[0030] The de-cooled steam is pressurized and then delivered to the external steam supply pipeline.

[0031] The above-mentioned technical solution of this application has at least the following beneficial technical effects:

[0032] The amount of main steam extracted from the boiler or reheat steam from the reheater can be adjusted, thereby adjusting the amount of steam entering the intermediate-pressure cylinder and low-pressure cylinder, controlling the power generation and the amount of steam supplied to external users, achieving peak shaving and frequency regulation. At the same time, the charging rate or discharge rate of the battery can be adjusted to achieve more precise and faster system frequency regulation. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or in the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the principle structure of a steam supply, energy storage, peak shaving, and frequency regulation system for a thermal power plant, according to one embodiment of this application.

[0035] Figure 2 This is a schematic diagram of the principle structure of a steam supply, energy storage, peak shaving, and frequency regulation system for a thermal power plant, according to one embodiment of this application.

[0036] Figure 3 This is a schematic diagram of the principle structure of a steam supply, energy storage, peak shaving, and frequency regulation system for a thermal power plant, according to one embodiment of this application.

[0037] in, Figures 1 to 3 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0038] 1. Boiler; 2. High-pressure cylinder; 3. Medium-pressure cylinder; 4. Low-pressure cylinder; 5. Generator; 6. Condenser; 7. Condensate pump; 8. Low-pressure heater; 9. Deaerator; 10. Feed water pump; 11. High-pressure heater; 12. Battery; 13. Steam ejector; 14. Desuperheating and pressure reducing device one; 15. Desuperheating and pressure reducing device two; 16. Desuperheating and pressure reducing device three; 17. Steam compressor. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details are presented in the various embodiments of this application to facilitate a better understanding of the application. However, the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments. The division of the various embodiments below is for ease of description and should not constitute any limitation on the specific implementation of this application. The various embodiments can be combined with and referenced by each other without contradiction.

[0040] Currently, existing technologies present the challenge of reconfiguring the structure of thermal power systems to meet the demands of peak shaving, frequency regulation, and external steam supply.

[0041] To address the aforementioned problems, one embodiment of this application provides a system for steam supply, energy storage, peak shaving, and frequency regulation in a thermal power plant. The system comprises a boiler 1, a turbine unit, and a generator 5. The turbine unit includes a high-pressure cylinder 2, an intermediate-pressure cylinder 3, and a low-pressure cylinder 4. The boiler 1 produces main steam through thermal operation. The main steam pipeline downstream of the boiler 1 sequentially connects to the high-pressure cylinder 2, the intermediate-pressure cylinder 3, and the low-pressure cylinder 4. The high-pressure cylinder 2, the intermediate-pressure cylinder 3, and the low-pressure cylinder 4 drive the generator 5 to generate electricity. The main steam first enters the high-pressure cylinder 2. The steam generated by the high-pressure cylinder 2 then enters the intermediate-pressure cylinder 3, and finally the low-pressure cylinder 4. After each cylinder converts the thermal energy of the steam into kinetic energy, the temperature and pressure of the output steam decrease sequentially. The main return pipeline downstream of the low-pressure cylinder 4 connects to the boiler 1. The steam generated by the low-pressure cylinder 4 is processed through the main return pipeline and its equipment before returning to the boiler 1 to participate in the circulation. The system specifically includes:

[0042] The reheater, installed on boiler 1, is heated within boiler 1. Its inlet (cold section) is connected to high-pressure cylinder 2, and its outlet (hot section) is connected to intermediate-pressure cylinder 3. It is used to reheat part of the steam generated by high-pressure cylinder 2 and then send it to intermediate-pressure cylinder 3. The amount of reheated and transported steam can be adjusted according to specific needs. For example, during peak electricity demand periods, part of the steam generated by high-pressure cylinder 2 can be reheated and then sent to intermediate-pressure cylinder 3 to increase the operating power of intermediate-pressure cylinder 3, thereby driving generator 5 to produce more electricity. It also protects the reheater from dry burning or overheating.

[0043] The outlet of boiler 1 and / or the outlet of reheater are connected to the external steam supply pipeline, which can provide a portion of the steam produced by boiler 1 or reheater to external users (industrial steam supply, heating, etc.); when the power demand is low and the power system needs to regulate peak loads, the amount of steam entering the external steam supply pipeline is increased and the amount of steam entering the turbine unit is reduced.

[0044] Battery 12, connected to the output of generator 5, is used to store some electrical energy or release the stored electrical energy into the power grid. During periods of low electricity demand, a portion of the electrical energy is stored for backup to avoid waste; during periods of high electricity demand, the stored power can be fed into the grid. When the power grid requires frequency regulation, the charging or discharging rate of battery 12 is adjusted to meet the frequency regulation requirements, thereby increasing the frequency regulation rate.

[0045] The amount of main steam extracted from boiler 1 or reheat steam from the reheater can be adjusted, thereby adjusting the amount and temperature of steam entering the intermediate pressure cylinder 3 and the low pressure cylinder 4, controlling the power generation and the amount of steam supplied to external users, achieving peak shaving and frequency regulation. At the same time, the charging rate or discharge rate of battery 12 can be adjusted to achieve faster system frequency regulation.

[0046] In the power plant steam supply, energy storage, peak shaving, and frequency regulation system of this application, a condenser 6, a condensate pump 7, a low-pressure heater 8, a deaerator 9, a feedwater pump 10, and a high-pressure heater 11 are sequentially installed on the main return pipeline downstream of the low-pressure cylinder 4. This allows the steam output from the low-pressure cylinder 4 to be condensed into condensate, which is then transported by the condensate pump 7. After passing through low-temperature heating, deaeration, efficiency improvement by the feedwater pump 10, and high-temperature heating, the steam is returned to the boiler 1 for recycling.

[0047] Example 1

[0048] In this embodiment, the system further includes a steam ejector 13 and a desuperheating and pressure reducing device 14; wherein,

[0049] The inlet of steam ejector 13 is connected to the outlet of boiler 1 and the outlet of reheater, while the outlet of steam ejector 13 is connected to the external steam supply pipeline and the inlet of reheater. Steam ejector 13 utilizes a portion of the high-temperature, high-pressure main steam produced by boiler 1 to inject high-temperature, medium-low-pressure reheat steam, forming medium-temperature, high-pressure medium-low-pressure steam. Part of the medium-temperature, high-pressure medium-low-pressure steam returns to the reheater, while the other part is transported to the external steam supply pipeline. Desuperheating and pressure reducing device 14 is located downstream of steam ejector 13 and is used to regulate the temperature and pressure of the steam entering the external steam supply pipeline and reheater after injection. It should be noted that "high-temperature, high-pressure," "high-temperature, medium-low-pressure," and "medium-temperature, high-pressure medium-low-pressure" in this application are relative terms.

[0050] The method for peak shaving and frequency modulation in this embodiment is as follows:

[0051] When electricity demand is low, thermal power plants require deep peak-shaving operation, and the reheat steam produced by the reheater cannot meet the steam supply needs of external users:

[0052] Steam ejector 13 utilizes a portion of the high-temperature, high-pressure main steam extracted from boiler 1 to eject high-temperature, medium-low-pressure reheat steam, forming medium-temperature, high-pressure steam. Then, a portion of the feedwater from feedwater pump 10 cools the medium-temperature, high-pressure steam. After cooling, a portion returns to the cold section of the reheater to prevent overheating, while the remaining steam is adjusted to preset parameters and supplied to external users. With a portion of the main steam from boiler 1 extracted, the amount of steam entering the turbine unit to perform work decreases, reducing the turbine unit's operating power and power generation, thus achieving deep peak shaving. In this embodiment, the application of steam ejector 13 meets the steam supply needs of external users and protects the reheater. Simultaneously, a battery 12 of a certain capacity is configured at the generator 5 outlet for energy storage, further reducing the unit load. By controlling the charging speed of the battery 12, the unit's peak shaving and frequency regulation capabilities are significantly increased. Furthermore, the boiler 1's operating efficiency can be maintained at a relatively high level without frequent adjustments.

[0053] Battery 12 is used to store part of the electrical energy produced by generator 5, and the charging rate of battery 12 is controlled.

[0054] When the electricity load demand is high, most of the reheat steam produced by the reheater is supplied to the intermediate-pressure cylinder 3, increasing the actual power of the turbine unit and increasing power generation, or releasing the stored electrical energy to the grid; controlling the rate at which the battery 12 stores and releases electrical energy, thereby improving the frequency regulation rate. Example 2

[0055] In this embodiment, the system is also equipped with a high-voltage bypass system, including a de-cooling and pressure-reducing device 15, such as... Figure 2As shown, its inlet is connected to the outlet of boiler 1, and its outlet is connected to the external steam supply pipeline and the reheater inlet; the de-heating and pressure reducing device 2 15 is used to adjust the pressure and temperature of part of the main steam produced by boiler 1 and then deliver it to the reheater and the external steam supply pipeline respectively.

[0056] The method for peak shaving and frequency modulation in this embodiment is as follows:

[0057] When the electrical load is low, the steam demand from external users increases, and the reheater temperature exceeds the limit:

[0058] Extract a portion of the high-temperature, high-pressure main steam produced by boiler 1;

[0059] The main steam is de-cooled and depressurized using a portion of the feedwater from the outlet of feedwater pump 10 on the main return pipeline.

[0060] After the steam is de-cooled and depressurized, its parameters are adjusted. Part of the steam is returned to the reheater to prevent the reheater from overheating, and the other part is supplied to external users through the external steam supply pipeline. Battery 12 is used to store part of the electrical energy produced by generator 5. After the main steam of boiler 1 is extracted, the amount of steam entering the turbine unit to do work is reduced, the power generation load of the turbine unit decreases, and peak shaving is achieved.

[0061] Example 3

[0062] In this embodiment, the system further includes a vapor compression device 17 and a desuperheating and pressure reducing device 16;

[0063] The inlet of the desuperheating and pressure reducing device 16 is connected to the outlet of the reheater, and is used to cool and depressurize a portion of the reheat steam extracted from the reheater; the outlet of the desuperheating and pressure reducing device 16 is connected to the inlet of the steam compression device 17; the outlet of the steam compression device 17 is connected to an external steam supply pipeline, and is used to pressurize the desuperheated and pressure-reduced steam and supply it to external users.

[0064] The method for peak shaving and frequency modulation in this embodiment is as follows:

[0065] When the pressure of reheat steam does not meet the steam supply demand:

[0066] A portion of the condensate from the outlet of condensate pump 7 is used to de-heat a portion of the reheat steam produced by boiler 1.

[0067] The desuperheated steam is pressurized and then supplied to the external steam supply pipeline to meet the needs of steam supply and peak shaving. A portion of reheat steam is extracted from the reheater outlet and injected with feedwater from the condensate pump outlet in the desuperheating and pressure reducing device 16 to regulate its temperature and pressure. Afterward, the steam enters the steam compressor 17 to increase the pressure to the steam supply parameters and is then supplied externally. After steam extraction, the amount of steam entering the turbine unit to perform work is reduced, thus lowering the unit's power generation load and achieving peak shaving. Utilizing the battery energy storage at the generator 5 outlet can further enhance the unit's peak shaving and frequency regulation capabilities.

[0068] In addition, in some specific embodiments, when the turbine unit does not require low-load operation or peak operation, the unit prioritizes steam supply demand by extracting steam, and releasing the electrical energy stored in the battery 12 can compensate for the insufficient power generation load caused by the large amount of external steam supply. At the same time, during the process of storing or releasing electrical energy, the battery 12 cooperates with the turbine unit to regulate the frequency, thereby improving the frequency regulation performance of the turbine unit; alternatively, a certain capacity of energy storage battery 12 can be reserved specifically for cooperating with the unit's frequency regulation, so that the frequency regulation capability of the turbine unit at full load is improved.

[0069] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this application and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this application should be included within the protection scope of this application. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A system for steam supply, energy storage, peak shaving, and frequency regulation in a thermal power plant, comprising a boiler (1), a high-pressure cylinder (2), a medium-pressure cylinder (3), a low-pressure cylinder (4), and a generator (5), wherein a main steam pipe downstream of the boiler (1) is sequentially connected to the high-pressure cylinder (2), the medium-pressure cylinder (3), and the low-pressure cylinder (4), and the high-pressure cylinder (2), the medium-pressure cylinder (3), and the low-pressure cylinder (4) drive the generator (5); a main return pipe downstream of the low-pressure cylinder (4) is connected to the boiler (1), characterized in that, include: A reheater is installed on the boiler (1), with its inlet connected to the high-pressure cylinder (2) and its outlet connected to the intermediate-pressure cylinder (3). The reheater is used to reheat part of the steam generated by the high-pressure cylinder (2) and then deliver it to the intermediate-pressure cylinder (3). The outlet of the boiler (1) and / or the outlet of the reheater are connected to an external steam supply line, which is used to supply steam to external users. The battery (12) is connected to the output terminal of the generator (5) and is used to store part of the electrical energy or to release the stored electrical energy to the power grid.

2. The system according to claim 1, characterized in that, It also includes a steam ejector (13) and a desuperheating and pressure reducing device (14); The inlet of the steam ejector (13) is connected to the outlet of the boiler (1) and the outlet of the reheater. The outlet of the steam ejector (13) is connected to the external steam supply pipeline and the inlet of the reheater. The steam ejector (13) uses part of the high temperature and high pressure main steam produced by the boiler (1) to eject high temperature and low pressure reheat steam to form medium-low pressure steam with higher medium temperature. Part of the medium-low pressure steam with higher medium temperature is returned to the reheater, and the other part is transported to the external steam supply pipeline. The de-heating and pressure reducing device (14) is located downstream of the steam ejector (13) and is used to adjust the temperature and pressure of the steam entering the external steam supply pipeline and the reheater after ejection.

3. The system according to claim 1, characterized in that, It also includes a second de-heating and pressure reducing device (15), whose inlet is connected to the outlet of the boiler (1), and whose outlet is connected to the external steam supply pipeline and the reheater inlet; The second de-heating and pressure reducing device (15) is used to adjust the pressure and temperature of part of the main steam produced by the boiler (1) and then deliver it to the reheater and the external steam supply pipeline respectively.

4. The system according to claim 1, characterized in that, It also includes a steam compression device (17) and a desuperheating and pressure reducing device three (16); The inlet of the de-heating and pressure reducing device three (16) is connected to the outlet of the reheater, and is used to de-heat and depressurize a portion of the reheat steam extracted from the reheater; the outlet of the de-heating and pressure reducing device three (16) is connected to the inlet of the steam compression device (17). The outlet of the steam compression device (17) is connected to an external steam supply pipeline, which is used to pressurize the de-cooled and de-pressurized steam and supply it to external users.

5. The system according to any one of claims 2-4, characterized in that, The main return pipe downstream of the low-pressure cylinder (4) is sequentially equipped with a condenser (6), a condensate pump (7), a low-pressure heater (8), a deaerator (9), a feed water pump (10), and a high-pressure heater (11).

6. The system according to claim 5, characterized in that, Part of the water supplied from the outlet of the water pump (10) is supplied to either the first desuperheating and pressure reducing device (14) or the second desuperheating and pressure reducing device (15).

7. The system according to claim 5, characterized in that, A portion of the condensate from the outlet of the condensate pump (7) is supplied to the desuperheating and pressure reducing device (16).

8. A method for peak shaving and frequency regulation of steam supply and energy storage in a thermal power plant, applied to the system for peak shaving and frequency regulation of steam supply and energy storage in a thermal power plant as described in claim 5, characterized in that, When the electricity load is low, the thermal power plant needs deep peak shaving, and the reheat steam produced by the reheater cannot meet the steam supply needs of external users: The high-temperature and high-pressure main steam produced by the boiler (1) is used to induce high-temperature and low-pressure reheat steam to form medium-temperature and low-pressure steam. The medium-temperature, medium-low-pressure steam is cooled by using part of the feed water from the outlet of the feed water pump (10); A portion of the cooled steam is supplied to the reheater, and the other portion is supplied to external users through the external steam supply pipeline. The battery (12) is used to store part of the electrical energy produced by the generator (5).

9. A method for peak shaving and frequency regulation of steam supply and energy storage in a thermal power plant, applied to the system for peak shaving and frequency regulation of steam supply and energy storage in a thermal power plant as described in claim 5, characterized in that... When the electrical load is low, the steam demand from external users increases, and the reheater temperature exceeds the limit: Using part of the feedwater from the outlet of the feedwater pump (10), the high-temperature and high-pressure main steam produced by the boiler (1) is de-temperatured and de-pressurized; After adjusting the steam parameters to reduce temperature and pressure, part of the steam is supplied to the reheater, and the other part is supplied to external users through the external steam supply pipeline. Use the battery (12) to store part of the electrical energy produced by the generator (5), or release the stored electrical energy onto the power grid; Control the rate at which the battery (12) stores electrical energy and the rate at which it releases electrical energy.

10. A method for peak shaving and frequency regulation of steam supply and energy storage in a thermal power plant, applied to the system for peak shaving and frequency regulation of steam supply and energy storage in a thermal power plant as described in claim 5, characterized in that, When the pressure of reheat steam does not meet the steam supply demand: Using a portion of the condensate from the outlet of the condensate pump (7), a portion of the reheat steam produced by the boiler (1) is de-heated; The de-cooled steam is pressurized and then delivered to the external steam supply pipeline.

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