CN220267794U - Wide load peak regulation system is reformed transform to flexibility of steam turbine bypass steam supply - Google Patents

Abstract

The application discloses a wide load peak shaving system is reformed transform to steam turbine bypass steam supply's flexibility. The system comprises a superheater, wherein the output end of the superheater is connected with the first input end of the high-pressure cylinder through a first pipeline; the first pipeline is connected with one end of a third pipeline, the connection point is positioned between the output end of the superheater and the first switch door, and the other end of the third pipeline is connected with the second pipeline; the output end of the reheater is connected with the input end of the medium pressure cylinder through a fourth pipeline; the fourth pipeline is connected with one end of a tenth pipeline, the connection point is positioned between the output end of the reheater and the third switch door, and the other end of the tenth pipeline is connected with the second input end of the condenser; the tenth pipeline is connected with one end of the eleventh pipeline, and the other end of the eleventh pipeline is connected with industrial steam equipment. According to the method, steam can be directly extracted from the reheat steam pipeline to serve as a supplementary steam source for heat supply and steam extraction, and the steam is supplied to an industrial steam user through the eleventh pipeline, so that economic benefits are improved, and meanwhile, the purpose of thermal decoupling is achieved.

Description

Wide load peak regulation system is reformed transform to flexibility of steam turbine bypass steam supply

Technical Field

The application relates to the technical field of thermal power generation, in particular to a wide load peak regulation system for improving the flexibility of bypass steam supply of a steam turbine.

Background

With the development of the economic, energy and environmental protection industries in China, the thermal power industry faces more and more challenges. Today, the large-scale investment of new energy further compresses the share of the thermal power generating unit in the power generation market, and the phenomenon of electric energy surplus is increasingly severe. Meanwhile, the natural properties of wind and light power generation determine the fluctuation and intermittence of the wind and light power generation, and the grid-connected digestion problem seriously affects the stable operation of the power grid. In order to realize the double drop of the waste wind and the waste light rate, the thermal power unit is required to be flexibly modified to reduce the minimum output limit of the unit, the deep peak regulation task is born at any time, and the power generation space is reserved for renewable energy sources. Therefore, the thermal power plant flexibility transformation and the deep peak regulation are realized, and the thermal power plant flexibility transformation and the deep peak regulation become necessary conditions for determining the existence of thermal power enterprises.

For this reason, in the prior art, a scheme for modifying a power plant system is disclosed in, for example, chinese patent document CN112610293a, which discloses a wide load peak regulation system of a pure condensing unit, and the wide load peak regulation system comprises a boiler, a high-pressure turbine cylinder, a medium-pressure turbine cylinder, a low-pressure turbine cylinder, a generator, a low-pressure heater, a high-pressure heater, a deaerator and a heat storage device, wherein the high-pressure turbine cylinder, the medium-pressure turbine cylinder, the low-pressure turbine cylinder and the generator are sequentially connected, the high-pressure turbine cylinder is respectively connected with the boiler through a main steam pipe and a high-pressure exhaust steam pipe, the medium-pressure turbine cylinder is connected with the boiler through a reheat steam pipe, the medium-pressure turbine cylinder is also connected with the low-pressure turbine cylinder through a medium-pressure exhaust steam pipe, the medium-pressure exhaust steam pipe is connected with a medium-pressure exhaust steam pipe branch pipe, the low-pressure turbine cylinder, the low-pressure turbine heater, the high-pressure heater, the deaerator the high-pressure heater and the boiler are sequentially connected with the heat storage device through a low-pressure heater water inlet pipe, a condensation water pipe and a boiler water supply pipe, and the low-pressure heater are also connected with the heat storage device through a heat storage device, and the low-pressure heater is also connected with the low-pressure heater through the low-pressure heater.

However, the inventor has realized that in the above solution, the excess steam can only be fed into the heat storage device for heat exchange and storage during peak shaving, and the excess steam cannot be used as industrial steam and is not utilized better, so that the economic benefit is low.

Disclosure of Invention

Therefore, the application provides a wide load peak shaving system is reformed by the flexibility of the bypass steam supply of the steam turbine, so as to solve the technical problems that redundant steam in the existing peak shaving system cannot be used as industrial steam supply and has lower economic benefit.

In order to achieve the above object, the present application provides the following technical solutions:

the flexible transformation wide-load peak regulation system for bypass steam supply of the steam turbine comprises a superheater, wherein the output end of the superheater is connected with the first input end of a high-pressure cylinder through a first pipeline, and a first switch door and a first regulating door are arranged on the first pipeline; the output end of the high-pressure cylinder is connected with the input end of the reheater through a second pipeline; the first pipeline is connected with one end of a third pipeline, a connection point is positioned between the output end of the superheater and the first switch door, the other end of the third pipeline is connected with a second pipeline, and the third pipeline is provided with a second switch door and a second regulating door; the output end of the reheater is connected with the input end of the medium pressure cylinder through a fourth pipeline, and a third switch door and a third regulating door are arranged on the fourth pipeline; the output end of the medium pressure cylinder is connected with the input end of the low pressure cylinder through a fifth pipeline, and a fourth regulating valve is arranged on the fifth pipeline; the output end of the low-pressure cylinder is connected with the first input end of the condenser; the output end of the condenser is connected with the input end of the deaerator through a sixth pipeline, and a condensing pump is arranged on the sixth pipeline; the two output ends of the deaerator are connected with the two input ends of a ninth pipeline through a seventh pipeline and an eighth pipeline respectively, a first steam pump is arranged on the seventh pipeline, and a second steam pump is arranged on the eighth pipeline; the output end of the ninth pipeline is connected with the input end of the superheater; the fourth pipeline is connected with one end of a tenth pipeline, the connection point is positioned between the output end of the reheater and the third switch door, and the other end of the tenth pipeline is connected with the second input end of the condenser; a fourth door, a fifth door and a fifth door are arranged on the tenth pipeline; the tenth pipeline is connected with one end of an eleventh pipeline, the connecting point is positioned between the fifth regulating door and the fifth switching door, and the other end of the eleventh pipeline is connected with industrial steam equipment; and a sixth switch door is arranged on the eleventh pipeline.

Optionally, the flexible transformation wide load peak regulation system for bypass steam supply of the steam turbine further comprises a twelfth pipeline, wherein one end of the twelfth pipeline is connected with the first pipeline, and a connection point is positioned between the first switch door and the first regulating door; the other end of the twelfth pipeline is connected with the second input end of the high-pressure cylinder, and a sixth regulating gate is arranged on the twelfth pipeline.

Optionally, the flexible transformation wide load peak regulation system for bypass steam supply of the steam turbine further comprises a thirteenth pipeline, one end of the thirteenth pipeline is connected with the second pipeline, and the other end of the thirteenth pipeline is connected with a condensate tank; the thirteenth pipeline is provided with a first desuperheater and a seventh regulating gate.

Further optionally, the second pipe is provided with a first temperature sensor.

Optionally, the flexible transformation wide load peak regulation system for bypass steam supply of the steam turbine further comprises a fourteenth pipeline, one end of the fourteenth pipeline is connected with the third pipeline, and the other end of the fourteenth pipeline is connected with a condensate tank; a second desuperheater and an eighth regulating gate are arranged on the fourteenth pipeline.

Further optionally, a second temperature sensor is disposed on the third pipe.

Optionally, the flexible transformation wide load peak shaving system for bypass steam supply of the steam turbine further comprises a fifteenth pipeline, one end of the fifteenth pipeline is connected with the tenth pipeline, and the other end of the fifteenth pipeline is connected with a condensate tank; and a third desuperheater and a ninth regulating gate are arranged on the fifteenth pipeline.

Further optionally, a third temperature sensor is disposed on the tenth pipe.

Compared with the prior art, the application has the following beneficial effects:

the embodiment of the application provides a new hardware architecture for modifying a wide load peak shaving system by the flexibility of steam turbine bypass steam supply, which is characterized in that a path of high-pressure bypass is added between a superheater and a reheater on the basis of the existing peak shaving system, and a path of low-pressure bypass is added between the reheater and a condenser; wherein the third pipeline, a second switch door and a second regulating door which are arranged on the third pipeline form a high-pressure bypass; the tenth pipeline and a fourth door, a fifth regulating door and a fifth opening and closing door arranged on the tenth pipeline, and the eleventh pipeline and a sixth opening and closing door arranged on the eleventh pipeline form a low-pressure bypass; based on the hardware architecture, the steam can be directly extracted from main steam of the boiler, is subjected to temperature and pressure reduction, is connected into a high-pressure cylinder for exhausting steam, then directly enters the reheater, and can be directly extracted from a reheat steam pipeline to serve as a supplementary steam source for heat supply and extraction, so that redundant steam can be directly provided for industrial steam users through an eleventh pipeline, and benefits are earned by supplying steam to the industrial steam users; part of the main steam bypasses the high-pressure cylinder through the high-pressure bypass so as to reduce the work done by the high-pressure cylinder; part of reheat steam bypasses the medium pressure cylinder through the low pressure bypass to reduce the work done by the medium pressure cylinder, so that the output of the generator set is reduced under the condition of improving the steam extraction and heat supply capacity of the generator set, and the aim of thermal decoupling is fulfilled while the economic benefit is improved; the method can improve the steam supply capacity of the unit, and simultaneously reduce the generating power of the unit, thereby improving the peak shaving capacity of the unit.

Drawings

For a more visual illustration of the prior art and the present application, several exemplary drawings are presented below. It should be understood that the specific shape and configuration shown in the drawings should not be considered in general as limiting upon the practice of the present application; for example, based on the technical concepts and exemplary drawings disclosed herein, those skilled in the art have the ability to easily make conventional adjustments or further optimizations for the add/subtract/assign division, specific shapes, positional relationships, connection modes, dimensional scaling relationships, etc. of certain units (components).

Fig. 1 is a schematic structural diagram of a wide load peak shaving system for flexible transformation of bypass steam supply of a steam turbine according to an embodiment of the present application.

Reference numerals illustrate:

1. a superheater; 2. a first pipe; 3. a high-pressure cylinder; 4. a first switch door; 5. a first transfer gate; 6. a second pipe; 7. a reheater; 8. a third conduit; 9. a second switch door; 10. a second regulating gate; 11. a fourth conduit; 12. a medium pressure cylinder; 13. a third switch door; 14. a third switching gate; 15. a fifth pipe; 16. a low pressure cylinder; 17. a fourth switching gate; 18. a condenser; 19. a sixth conduit; 20. a deaerator; 21. a coagulation pump; 22. a seventh pipe; 23. an eighth conduit; 24. a ninth conduit; 25. a first steam pump; 26. a second steam pump; 27. a tenth pipe; 28. a fourth door is closed; 29. a fifth switching gate; 30. a fifth switch door; 31. an eleventh conduit; 32. sixthly, opening and closing a door; 33. a twelfth duct; 34. a sixth switching gate; 35. a thirteenth conduit; 36. a first desuperheater; 37. a seventh switching gate; 38. a fourteenth conduit; 39. a second desuperheater; 40. an eighth transfer gate; 41. a fifteenth conduit; 42. a third desuperheater; 43. a ninth switching gate; 44. and (5) a generator.

Detailed Description

The present application is further described in detail below with reference to the attached drawings.

In the description of the present application: unless otherwise indicated, the meaning of "a plurality" is two or more. The terms "first," "second," "third," and the like in this application are intended to distinguish between the referenced objects without a special meaning in terms of technical connotation (e.g., should not be construed as emphasis on degree or order of importance, etc.). The expressions "comprising", "including", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

The terms such as "upper", "lower", "left", "right", "middle", and the like, as referred to in this application, are generally used for convenience in visual understanding with reference to the drawings, and are not intended to be an absolute limitation of the positional relationship in actual products. Such changes in relative positional relationship are considered to be within the scope of the present description without departing from the technical concepts disclosed herein.

In this embodiment, a wide load peak regulation system for improving flexibility of bypass steam supply of a steam turbine is provided, as shown in fig. 1, the system comprises a superheater 1, an output end of the superheater 1 is connected with a first input end of a high-pressure cylinder 3 through a first pipeline 2, and a first switch door 4 and a first regulating door 5 (i.e., a high-pressure regulating door) are sequentially arranged on the first pipeline 2; the output end of the high-pressure cylinder 3 is connected with the input end of the reheater 7 through a second pipeline 6; the first pipeline 2 is connected with one end of a third pipeline 8, the connection point is positioned between the output end of the superheater 1 and the first switch door 4, the other end of the third pipeline 8 is connected with a second pipeline 6, and the third pipeline 8 is sequentially provided with a second switch door 9 and a second switch door 10; the output end of the reheater 7 is connected with the input end of the medium pressure cylinder 12 through a fourth pipeline 11, and a third switch door 13 and a third regulating door 14 are sequentially arranged on the fourth pipeline 11; the output end of the medium pressure cylinder 12 is connected with the input end of the low pressure cylinder 16 through a fifth pipeline 15, and a fourth regulating valve 17 (a connecting door of the high pressure cylinder, the medium pressure cylinder and the low pressure cylinder 16) is arranged on the fifth pipeline 15; the output end of the low pressure cylinder 16 is connected with the first input end of the condenser 18; the output end of the condenser 18 is connected with the input end of the deaerator 20 through a sixth pipeline 19, and a condensing pump 21 is arranged on the sixth pipeline 19; the two output ends of the deaerator 20 are respectively connected with the two input ends of a ninth pipeline 24 through a seventh pipeline 22 and an eighth pipeline 23, a first steam pump 25 is arranged on the seventh pipeline 22, and a second steam pump 26 is arranged on the eighth pipeline 23; the output end of the ninth pipeline 24 is connected with the input end of the superheater 1; the fourth pipeline 11 is connected with one end of a tenth pipeline 27, the connection point is positioned between the output end of the reheater 7 and the third switch door 13, and the other end of the tenth pipeline 27 is connected with the second input end of the condenser 18; a fourth door 28, a fifth door 29 and a fifth door 30 are sequentially arranged on the tenth pipeline 27; the tenth pipe 27 is also connected to one end of an eleventh pipe 31, the connection point is located between the fifth regulating door 29 and the fifth opening and closing door 30, and the other end of the eleventh pipe 31 is connected to industrial steam equipment (corresponding to an industrial steam user); the eleventh duct 31 is provided with a sixth opening and closing door 32.

Further, the flexible transformation wide load peak regulating system for the bypass steam supply of the steam turbine further comprises a twelfth pipeline 33, one end of the twelfth pipeline 33 is connected with the first pipeline 2, and the connecting point is positioned between the first switch door 4 and the first regulating door 5; the other end of the twelfth pipe 33 is connected to the second input end of the high-pressure cylinder 3, and a sixth switching gate 34 is provided on the twelfth pipe 33.

Further, the wide load peak shaving system for improving the flexibility of the bypass steam supply of the steam turbine further comprises a thirteenth pipeline 35, one end of the thirteenth pipeline 35 is connected with the second pipeline 6, and the other end of the thirteenth pipeline 35 is connected with the condensate tank; a thirteenth conduit 35 is provided with a first desuperheater 36 and a seventh switching gate 37.

Preferably, the second pipe 6 may be provided with a first temperature sensor for monitoring the temperature of the second pipe 6.

Further, the wide load peak regulation system for improving the flexibility of the bypass steam supply of the steam turbine further comprises a fourteenth pipeline 38, one end of the fourteenth pipeline 38 is connected with the third pipeline 8, and the other end of the fourteenth pipeline 38 is connected with the condensate tank; a second desuperheater 39 and an eighth switching gate 40 are provided on the fourteenth conduit 38.

Preferably, a second temperature sensor may be provided on the third pipe 8 for monitoring the temperature of the third pipe 8.

Further, the wide load peak shaving system for improving the flexibility of the bypass steam supply of the steam turbine further comprises a fifteenth pipeline 41, one end of the fifteenth pipeline 41 is connected with the tenth pipeline 27, and the other end of the fifteenth pipeline 41 is connected with the condensate tank; a fifteenth conduit 41 is provided with a third desuperheater 42 and a ninth switching gate 43.

Preferably, a third temperature sensor may be provided on the tenth conduit 27 for monitoring the temperature of the tenth conduit 27.

In the wide load peak regulating system for improving the flexibility of the bypass steam supply of the steam turbine, a high-pressure steam extraction pipeline (high-pressure bypass) is formed by a third pipeline 8, a second switch door 9 and a second regulating door 10 which are arranged on the third pipeline; the tenth duct 27 and the fourth, fifth and fifth opening and closing doors 28, 29 and 30 provided thereon, and the eleventh duct 31 and the sixth opening and closing door 32 provided thereon constitute a low-pressure steam extraction duct (low-pressure bypass).

The second switch door 9 is normally open, and can directly extract steam from main steam of the boiler by adjusting and opening the second switch door 10, and the steam is introduced into the high-pressure cylinder for steam extraction after temperature and pressure reduction, and then directly enters the reheater 7. Meanwhile, the fourth door 28 is normally opened, the fifth door 30 is normally closed, and the fifth door 29 and the sixth door 32 can be adjusted and opened to directly extract steam from the reheat steam pipeline as a supplementary steam source for heat supply and steam extraction. When the fourth door 28, the fifth door 29, and the sixth door 32 are opened, the surplus steam can be directly supplied to the industrial steam user through the eleventh pipe 31, and the industrial steam user is supplied with steam to earn profits

In the process, part of the main steam bypasses the high-pressure cylinder 3 through a high-pressure bypass so as to reduce the work of the high-pressure cylinder 3; part of reheat steam bypasses the medium pressure cylinder 12 through the low pressure bypass to reduce the work of the medium pressure cylinder 12, so that the output of the generator set is reduced under the condition of improving the steam extraction and heat supply capacity of the generator set, and the purpose of thermal decoupling is achieved while the economic benefit is improved.

In other words, the hardware architecture of the wide load peak shaving system is modified by the flexibility of the turbine bypass steam supply, which is provided by the application, is an improvement scheme of turbine bypass heat supply, and when power is generated, a part of high-quality steam is used for industrial steam supply, so that the power generation of a unit is reduced while the steam supply capacity of the unit is improved, and the power generation capacity of the unit is improved.

The method adopts a high-low bypass combined heating technology to implement deep peak shaving coupling optimization transformation of the turbine unit. Namely, by-passing part of the main steam to a high-pressure cylinder to exhaust the steam through a high side; and then extracting steam from the low-pressure bypass (reheat steam pipeline) to be used as a supplementary steam source for heat supply and steam extraction. The scheme can avoid the risks and problems existing in the overtemperature of the unit boiler and the thrust balance of the steam turbine by adopting a mode of properly matching the flow of the high and low bypass steam, and can meet the target requirement of unit flexibility transformation. For the high and low bypass combined steam supply scheme, the matching mode of the high side steam flow and the low side steam flow is a key factor affecting the axial thrust balance of the steam turbine and the safe operation of the steam turbine.

The design purpose of the turbine bypass is to coordinate unbalance between the boiler steam production and the turbine steam consumption, improve the adaptability of the unit to load and the flexibility of operation, and improve the safety of the unit during the start-stop and load shedding of the unit.

The bypass heat supply reduces the work of the high and medium pressure cylinders, reduces the output of the generator set under the condition of improving the heat supply capacity of the generator set, and achieves the purpose of thermal decoupling. The peak regulation capacity of bypass heat supply is not limited by a boiler, the peak regulation capacity is strong, the operation is flexible, and the complete thermal decoupling can be realized under extreme conditions, so that the method is a means for supplementing heat supply modes and realizing deep regulation of a unit; and in the areas needing industrial steam supply, the method can be used as an important way for guaranteeing industrial steam supply.

The high-pressure bypass is mainly used for balancing axial thrust and lifting high-pressure exhaust when the heat supply of the bypass is large, and is led out from a tee joint on the high-pressure steam guide pipe to a high-pressure steam exhaust pipeline. The high-pressure bypass part mainly comprises a temperature-reducing and pressure-reducing device, a high-pressure steam isolating valve, a temperature-reducing water isolating valve, a temperature mixing section, a safety valve and necessary measuring devices (pressure and temperature measuring devices before and after the high side, and high-side temperature-reducing water flow, pressure and temperature measuring devices).

The low-pressure bypass is an important device for realizing the temperature reduction and pressure reduction of steam from high parameters to heat supply parameters, and is led out to a heat supply user in a way of adding a tee joint on a heat re-pipeline. The low-pressure bypass part mainly comprises a temperature-reducing and pressure-reducing device, a steam isolation valve, a temperature-reducing water isolation valve, a temperature mixing section, a safety valve and necessary measuring devices (pressure and temperature measuring devices before and after low-side, low-side temperature-reducing water flow, pressure and temperature measuring devices).

In addition, based on the hardware architecture provided by the application, the peak shaving of the unit can be realized by adjusting the operation working conditions of part of the structures so as to meet the load requirements of different time periods. The optional operation method for modifying the wide load peak shaving system by the flexibility of the bypass steam supply of the steam turbine is as follows:

1. during peak load hours:

fully opening the first switch door 4, and increasing the opening of the first switch door 5 and the sixth switch door 34 to increase the main steam flow entering the high-pressure cylinder 3; in addition, the third switch door 13 is fully opened, the opening degree of the third switch door 14 is increased, and the fourth switch door 17 is fully opened, so that the steam flow entering the medium pressure cylinder 12 and the low pressure cylinder 16 is increased at the same time, and the aim of increasing the share of the steam acting in the high pressure cylinder 3, the medium pressure cylinder 12 and the low pressure cylinder 16 of the steam turbine is fulfilled; it is further possible to make the generator 44 perform as much work as possible, satisfying the external high load requirement.

At the same time, the first steam pump 25 and the second steam pump 26 are operated simultaneously, and the rotating speeds of the first steam pump 25 and the second steam pump 26 are increased, so that the sufficient water quantity can be provided for the superheater 1. By the operation method, the load of the wide load peak regulating system can be controlled to be 80% -100% by modifying the flexibility of the bypass steam supply of the steam turbine, and the load peak time requirement is met.

2. During the basic (conventional) peak shaving period:

fully opening the first switch door 4, reducing the opening of the first switch door 5 and the sixth switch door 34, and reducing the main steam flow entering the high-pressure cylinder 3 to a certain extent; in addition, the third switch door 13 is fully opened, the opening degree of the third switch door 14 is reduced, and the fourth switch door 17 is fully opened, so that the steam flow entering the medium pressure cylinder 12 and the low pressure cylinder 16 is reduced to a certain extent, and the aim of reducing the share of the steam acting in the high pressure cylinder 3, the medium pressure cylinder 12 and the low pressure cylinder 16 of the steam turbine to a certain extent is fulfilled; so that the work of the generator 44 is reduced to some extent compared to the peak load period, meeting the external conventional load requirements.

Meanwhile, the first and second steam pumps 25 and 26 are operated at the same time, and the rotation speeds of the first and second steam pumps 25 and 26 can be reduced according to circumstances. By the operation method, the load of the wide load peak shaving system can be controlled to be 40-80% by modifying the flexibility of the bypass steam supply of the steam turbine, and the basic peak shaving time period requirement is met.

3. During the deep peak shaving period:

opening the first switch door 4 and further reducing the opening of the first switch door 5 and the sixth switch door 34 compared with the basic peak shaver period to further reduce the main steam flow entering the high-pressure cylinder 3; in addition, the third switch door 13 is reduced, compared with basic peak shaving, the opening of the third switch door 14 is further reduced, and the fourth switch door 17 is closed, so that the steam flow entering the medium pressure cylinder 12 is further reduced, the low pressure cylinder 16 does not enter air, namely the low pressure cylinder 16 is cut off and does not work; the purposes of reducing the share of work in the high-pressure cylinder 3 and the middle-pressure cylinder 12 of the steam turbine as much as possible and enabling the low-pressure cylinder 16 not to do work are achieved; compared with the basic peak regulation period, the work of the generator 44 is further reduced, the rotating speed of the generator 44 is controlled to be constant, but the power is small, and the external low-load requirement is met.

At the same time, one of the first and second steam pumps 25 and 26 is selected to operate, reducing the amount of water supplied to the superheater 1. In addition, the fifth regulating door 29 and the fifth switching door 30 are opened, so that the steam part output by the reheater 7 can be conveyed to the condenser 18 to participate in the steam circulation process. By the operation method, the load of the wide load peak shaving system can be controlled to be 20-40% by modifying the flexibility of the bypass steam supply of the steam turbine, and the requirement of deep peak shaving time period is met.

4. And (3) temperature reduction:

the temperatures of the second pipeline 6, the third pipeline 8 and the tenth pipeline 27 can be monitored in real time through the first temperature sensor, the second temperature sensor and the third temperature sensor respectively; when the temperature of a certain pipeline exceeds the corresponding preset temperature threshold value according to the temperature detected by a certain sensor, a desuperheater corresponding to the pipeline can be started to cool and reduce the pressure, so that the operation safety of the system is ensured, and the damage of components is prevented.

5. In any period, when the steam quantity generated by the boiler is more than the steam quantity required by the generator 44, the second regulating valve 10 can be adjusted and opened to directly extract steam from main steam of the boiler, and the steam is introduced into the high-pressure cylinder to be exhausted after temperature and pressure reduction and then directly enters the reheater 7; meanwhile, by adjusting and opening the fifth regulating door 29 and the sixth opening and closing door 32, steam is directly extracted from the reheat steam pipeline as a supplementary steam source for heat supply and extraction, redundant steam can be directly supplied to industrial steam users through the eleventh pipeline 31, benefits are earned by supplying steam to the industrial steam users, and peak shaving can be assisted.

Any combination of the technical features of the above embodiments may be performed (as long as there is no contradiction between the combination of the technical features), and for brevity of description, all of the possible combinations of the technical features of the above embodiments are not described; these examples, which are not explicitly written, should also be considered as being within the scope of the present description.

The foregoing has outlined and detailed description of the present application in terms of the general description and embodiments. It should be appreciated that numerous conventional modifications and further innovations may be made to these specific embodiments, based on the technical concepts of the present application; but such conventional modifications and further innovations may be made without departing from the technical spirit of the present application, and such conventional modifications and further innovations are also intended to fall within the scope of the claims of the present application.

Claims (8)

1. The flexible transformation wide-load peak regulation system for bypass steam supply of the steam turbine is characterized by comprising a superheater, wherein the output end of the superheater is connected with the first input end of a high-pressure cylinder through a first pipeline, and a first switch door and a first regulating door are arranged on the first pipeline; the output end of the high-pressure cylinder is connected with the input end of the reheater through a second pipeline; the first pipeline is connected with one end of a third pipeline, a connection point is positioned between the output end of the superheater and the first switch door, the other end of the third pipeline is connected with a second pipeline, and the third pipeline is provided with a second switch door and a second regulating door; the output end of the reheater is connected with the input end of the medium pressure cylinder through a fourth pipeline, and a third switch door and a third regulating door are arranged on the fourth pipeline; the output end of the medium pressure cylinder is connected with the input end of the low pressure cylinder through a fifth pipeline, and a fourth regulating valve is arranged on the fifth pipeline; the output end of the low-pressure cylinder is connected with the first input end of the condenser; the output end of the condenser is connected with the input end of the deaerator through a sixth pipeline, and a condensing pump is arranged on the sixth pipeline; the two output ends of the deaerator are connected with the two input ends of a ninth pipeline through a seventh pipeline and an eighth pipeline respectively, a first steam pump is arranged on the seventh pipeline, and a second steam pump is arranged on the eighth pipeline; the output end of the ninth pipeline is connected with the input end of the superheater; the fourth pipeline is connected with one end of a tenth pipeline, the connection point is positioned between the output end of the reheater and the third switch door, and the other end of the tenth pipeline is connected with the second input end of the condenser; a fourth door, a fifth door and a fifth door are arranged on the tenth pipeline; the tenth pipeline is connected with one end of an eleventh pipeline, the connecting point is positioned between the fifth regulating door and the fifth switching door, and the other end of the eleventh pipeline is connected with industrial steam equipment; and a sixth switch door is arranged on the eleventh pipeline.

2. The flexible retrofit wide load peaking system of turbine bypass steam supply of claim 1, further comprising a twelfth duct having one end connected to the first duct, the connection point being located between the first switch door and the first tuning door; the other end of the twelfth pipeline is connected with the second input end of the high-pressure cylinder, and a sixth regulating gate is arranged on the twelfth pipeline.

3. The flexible retrofit wide load peaking system of turbine bypass steam supply of claim 1, further comprising a thirteenth pipe, one end of the thirteenth pipe being connected to the second pipe, the other end of the thirteenth pipe being connected to a condensate tank; the thirteenth pipeline is provided with a first desuperheater and a seventh regulating gate.

4. A flexible retrofit wide load peaking system for steam turbine bypass steam supply according to claim 3, wherein the second pipe is provided with a first temperature sensor.

5. The flexible retrofit wide load peaking system of turbine bypass steam supply of claim 1, further comprising a fourteenth pipeline, one end of the fourteenth pipeline being connected to the third pipeline, the other end of the fourteenth pipeline being connected to a condensate tank; a second desuperheater and an eighth regulating gate are arranged on the fourteenth pipeline.

6. The flexible retrofit wide load peaking system of turbine bypass steam supply of claim 5, wherein the third pipe is provided with a second temperature sensor.

7. The flexible retrofit wide load peaking system of turbine bypass steam supply of claim 1, further comprising a fifteenth pipe, one end of the fifteenth pipe being connected to the tenth pipe, the other end of the fifteenth pipe being connected to a condensate tank; and a third desuperheater and a ninth regulating gate are arranged on the fifteenth pipeline.

8. The flexible retrofit wide load peaking system of turbine bypass steam supply of claim 7, wherein a third temperature sensor is provided on the tenth pipe.