A high-efficiency thermal system based on a wide-range boost module and its operation method

Abstract

The present invention discloses an efficient thermal system based on a wide-range supercharging module and its operation method, comprising a boiler, high-, medium-, and low-pressure cylinders, and a generator; further comprising a wide-range supercharging module, wherein the supercharging cylinder of the wide-range supercharging module is coaxially arranged with the high-pressure cylinder; one end of the main steam pipeline main pipe of the main steam pipeline is connected to the boiler, and the other end thereof is connected in parallel to the first and second steam inlet branches; the first and second steam inlet branches are respectively provided with first and second steam inlet regulating valves; the supercharging cylinder is connected to the second steam inlet branch and the wide-range feedwater warmer via a first exhaust pipeline and a first extraction pipeline; the first exhaust pipeline and the first extraction pipeline are respectively provided with a first exhaust valve and a first extraction valve; one end of the first exhaust pipeline is connected to the exhaust port of the supercharging cylinder, and the other end thereof is connected to the second steam inlet branch; a third steam inlet regulating valve is provided on the second steam inlet branch between the first exhaust pipeline and the first steam inlet branch. The present invention can operate efficiently under high load, has low construction cost, and improves operational flexibility.

Description

Technical Field

[0001] The present invention belongs to the technical field of steam turbine power generation, and in particular relates to a high-efficiency thermal system based on a wide-range boosting module and an operating method thereof. Background Art

[0002] With the continued development of a new power system, coal-fired power is playing an increasingly prominent role in providing a safety net and supporting regulation within the system. To adapt to the development of this new power system, the coal-fired power technology system needs to be further expanded, focusing on clean carbon reduction, safety and reliability, efficient regulation, and intelligent operation.

[0003] As the proportion of installed capacity from renewable energy sources increases, coal-fired power units are increasingly operating at low loads for peak load regulation, leading to a decrease in annual utilization hours. Therefore, low-load economic efficiency is becoming increasingly important. Conventional steam turbines operating at partial load experience significant drops in main steam pressure and feedwater temperature, significantly reducing cycle efficiency and economic efficiency, making them unable to meet the technical requirements for efficient regulation. Summary of the Invention

[0004] The purpose of the present invention is to address the shortcomings of the existing technology and provide a high-efficiency thermal system based on a wide-range boosting module and its operating method, which can widely increase the main steam pressure under partial load and achieve efficient operation under high load, simplify the system configuration, reduce construction costs, and improve operational flexibility.

[0005] The technical objectives of the present invention are achieved through the following technical solutions:

[0006] A high-efficiency thermal system based on a wide-width boosting module comprises a boiler and a coaxial arrangement and sequential connection of a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder and a generator; the boiler is connected to the intermediate-pressure cylinder via a reheat steam hot section pipeline, and the intermediate-pressure cylinder and the low-pressure cylinder are connected via a connecting pipe; the low-pressure cylinder is connected to a condenser via a condensing pipeline; the condenser is connected to the original heat recovery system via a pipeline, and further comprises a wide-width boosting module, wherein the boosting cylinder of the wide-width boosting module is coaxially arranged with the high-pressure cylinder; the main steam pipeline comprises a main steam pipeline mother pipe, one end of the main steam pipeline mother pipe is connected to the boiler, and the other end thereof is connected in parallel to a first steam inlet branch and a second steam inlet branch; the first steam inlet branch is used to Connected to the steam inlet of the boost cylinder; the second steam inlet branch is used to connect to the steam inlet of the high-pressure cylinder; the first steam inlet branch and the second steam inlet branch are respectively provided with a first steam inlet regulating valve and a second steam inlet regulating valve; the exhaust port and the extraction port of the boost cylinder are connected to the second steam inlet branch and the feed water wide-range warmer through the first exhaust pipe and the first extraction pipe respectively; the first exhaust pipe and the first extraction pipe are respectively provided with a first exhaust valve and a first extraction valve; one end of the first exhaust pipe of the boost cylinder is connected to the exhaust port of the boost cylinder, and the other end thereof is connected to the second steam inlet branch, and a third steam inlet regulating valve is provided on the second steam inlet branch between the first exhaust pipe and the first steam inlet branch.

[0007] Preferably, the wide-range feed water temperature booster is arranged on the boiler feed water pipe upstream of the zero high pressure booster of the original heat recovery system; the steam inlet of the wide-range feed water temperature booster is connected to the steam extraction port of the boosting cylinder through the first steam extraction pipeline.

[0008] Preferably, the first steam extraction pipeline is connected to the condenser through a condenser branch, and a first regulating valve is provided on the condenser branch; the steam inlet end of the condenser branch is arranged on the first steam extraction pipeline between the steam extraction port of the boost cylinder and the first steam extraction valve.

[0009] Preferably, the first steam extraction port of the high-pressure cylinder is connected to the boiler through a reheat steam cold section pipeline; the second steam extraction port of the high-pressure cylinder is connected to the steam inlet of the No. 0 high-pressure heater through a second steam extraction pipeline, and the No. 0 high-pressure heater is arranged on the boiler feed water pipe between the wide-range feed water temperature increaser and the original heat recovery system; a second steam extraction valve is provided on the second steam extraction pipeline.

[0010] Preferably, the boost cylinder is designed to have a high rotation speed, and a reduction gearbox is added between the boost cylinder and the high-pressure cylinder.

[0011] Preferably, a clutch is arranged between the boost cylinder and the high-pressure cylinder.

[0012] Preferably, the wide-range feed water temperature increaser is a high-pressure heater.

[0013] A method for operating the aforementioned high-efficiency thermal system based on the wide-range boost module comprises:

[0014] When the unit is running at high load:

[0015] The first steam inlet regulating valve is fully closed, the boost cylinder is not put into operation, and only the rated speed is maintained;

[0016] The third steam inlet valve is fully opened, the second steam inlet regulating valve is fully opened, and the main steam directly enters the high-pressure cylinder;

[0017] The first exhaust pipe is fully closed and the first regulating valve is fully opened, so that the exhaust steam of the booster cylinder is connected to the condenser;

[0018] The first extraction valve is fully closed, the second extraction valve is open, the wide-range feedwater temperature increaser is not put into operation, and the zero high-pressure heater and the original heat recovery system are put into normal operation;

[0019] When the unit is running at low load:

[0020] The first steam inlet regulating valve is fully opened, the third steam inlet valve is fully closed, and the booster cylinder is put into operation;

[0021] The first exhaust valve is fully opened, the second steam inlet regulating valve is fully opened, and the main steam is discharged into the high-pressure cylinder through the booster cylinder;

[0022] The first regulating valve is fully closed, the first extraction valve is opened, the exhaust steam of the booster cylinder is discharged into the wide-range feedwater heater, and the wide-range feedwater heater is put into operation.

[0023] The second steam extraction valve is fully opened, and the No. 0 high-pressure heater and the original heat recovery system are put into operation normally.

[0024] Preferably, when the unit is reducing load:

[0025] The main steam pressure and feed water temperature gradually decrease, and the unit heat consumption gradually increases; after the unit load is reduced to a certain load;

[0026] Gradually open the first steam inlet regulating valve, close the third steam inlet regulating valve, open the first steam exhaust valve, and close the first regulating valve; gradually put the boost cylinder into operation; keep the second steam inlet regulating valve fully open, and gradually switch the exhaust steam of the boost cylinder from going to the condenser to going to the high-pressure cylinder.

[0027] Preferably, when the unit increases load:

[0028] Gradually close the first steam inlet regulating valve, open the third steam inlet regulating valve, close the first steam exhaust valve, and open the first regulating valve; gradually cut off the booster cylinder, and gradually switch the booster cylinder exhaust steam from going to the feedwater wide-range temperature increaser and high-pressure cylinder to going to the condenser;

[0029] When the first steam inlet regulating valve and the first steam exhaust valve are fully closed, and the third steam inlet regulating valve and the first regulating valve are fully opened; the boost cylinder is completely cut off and only the rated speed is maintained and idling;

[0030] During the process of cutting off the boost cylinder, gradually close the first steam extraction valve and cut off the wide-range feedwater temperature booster.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The booster cylinder of the high-efficiency thermal system based on the wide-range boosting module of the present invention is coaxially arranged with the high-pressure cylinder of the conventional steam turbine, which solves the problem of limited boosting amplitude and low economic benefits after the booster cylinder is put into use due to the limited power of the booster cylinder in the separate-axis arrangement of the booster cylinder and the conventional steam turbine, thereby widely increasing the main steam pressure under partial load.

[0033] Furthermore, because the booster cylinder is coaxially arranged with the conventional steam turbine, the booster module does not require an additional generator and corresponding auxiliary power lines, reducing initial investment. Under high load, the booster cylinder remains idle, avoiding the energy loss associated with maintaining cooling flow, thus achieving high-load and efficient operation.

[0034] Furthermore, because the booster cylinder is coaxially arranged with the conventional steam turbine, it maintains rated speed after removal, avoiding the need for a sudden start-up when the booster cylinder is restarted. This increases the speed of booster cylinder removal and commissioning, and provides greater operational flexibility. Consequently, this technical measure achieves a wide range of increased main steam pressure under partial load conditions and efficient operation under high loads. It also simplifies system configuration, reduces construction costs, and improves operational flexibility.

[0035] 2. The wide-range booster module of the present invention's high-efficiency thermal system based on a wide-range booster module also includes a wide-range feedwater temperature increaser installed on the boiler feedwater pipe of the original heat recovery system; the steam inlet of the wide-range feedwater temperature increaser is connected to the steam extraction port of the booster cylinder via a first steam extraction line. Under low load, when the booster cylinder and the wide-range feedwater temperature increaser are in operation, main steam first enters the booster cylinder, and exhaust steam from the booster cylinder supplies steam to the high-pressure cylinder and the wide-range feedwater temperature increaser. The wide-range feedwater temperature increaser can further increase the part-load feedwater temperature, significantly improving part-load economic efficiency and helping to maintain dry-state boiler operation and denitrification input during deep regulation.

[0036] 3. The operating method of the high-efficiency thermal system based on the wide-range boost module of the present invention not only improves the economy and operating efficiency of the system, but also enhances its environmental friendliness while simplifying maintenance and operation by flexibly switching operating modes, optimizing the thermal cycle, and reducing heat consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of the present invention;

[0038] Reference numerals: 1—boiler; 11—main steam pipeline; 111—main steam pipeline main pipe; 112—first steam inlet branch; 1121—first steam inlet regulating valve; 113—second steam inlet branch; 1131—second steam inlet regulating valve; 114—third steam inlet regulating valve; 12—reheat steam cold section pipeline; 13—reheat steam hot section pipeline;

[0039] 2—boost cylinder; 21—first exhaust pipe; 211—first exhaust valve; 22—first extraction pipe; 221—first extraction valve; 23—condenser branch; 231—first regulating valve; 24—feedwater wide-range temperature increaser;

[0040] 3—High-pressure cylinder; 31—Second steam extraction pipeline; 311—Second steam extraction valve; 32—No. 0 high-pressure heater;

[0041] 4—Intermediate-pressure cylinder; 41—Connecting pipe; 5—Low-pressure cylinder; 6—Generator; 7—Condenser; 8—Original heat recovery system; 81—Boiler feed water pipe. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0044] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. In addition, the terms "first," "second," etc. are used only to distinguish the descriptions and are not to be understood as indicating or implying relative importance.

[0045] like Figure 1 As shown, a high-efficiency thermal system based on a wide-width boosting module includes a boiler 1 and a coaxial arrangement and sequential connection of a high-pressure cylinder 3, an intermediate-pressure cylinder 4, a low-pressure cylinder 5, and a generator 6; the boiler 1 is connected to the intermediate-pressure cylinder 4 via a reheat steam hot section pipeline 13, and the intermediate-pressure cylinder 4 and the low-pressure cylinder 5 are connected via a connecting pipe 41; the low-pressure cylinder 5 is connected to the condenser 7 via a condensing pipeline; the condenser 7 is connected to the original heat recovery system 8 via a pipeline; and the wide-width boosting module is also included, wherein the boosting cylinder 2 of the wide-width boosting module is coaxially arranged with the high-pressure cylinder 3;

[0046] The main steam pipeline 11 includes a main steam pipeline main pipe 111, one end of which is connected to the boiler 1, and the other end of which is connected in parallel to the first steam inlet branch 112 and the second steam inlet branch 113; the first steam inlet branch 112 is used to connect to the steam inlet of the boost cylinder 2; the second steam inlet branch 113 is used to connect to the steam inlet of the high-pressure cylinder 3; the first steam inlet branch 112 and the second steam inlet branch 113 are respectively provided with a first steam inlet regulating valve 1121 and a second steam inlet valve 1122. Regulating valve 1131; the exhaust port and the extraction port of the boost cylinder 2 are connected to the second steam inlet branch 113 and the feed water wide-range temperature increaser 24 through the first exhaust pipe 21 and the first extraction pipe 22 respectively; the first exhaust pipe 21 and the first extraction pipe 22 are respectively provided with a first exhaust valve 211 and a first extraction valve 221; the second steam inlet branch 113 between the first exhaust pipe 21 and the first steam inlet branch 112 is provided with a third steam inlet regulating valve 114.

[0047] In specific implementations, the booster cylinder 2 of the wide-range booster module is coaxially arranged with the high-pressure cylinder 3, intermediate-pressure cylinder 4, low-pressure cylinder 5, and generator 6, with the booster cylinder 2 positioned on the side of the high-pressure cylinder 3 closest to the boiler 1. This coaxial arrangement of the booster cylinder 2 and the high-pressure cylinder 3 of a conventional steam turbine solves the problem of limited boosting amplitude and low economic benefits after the booster cylinder 2 is put into operation due to the limited power of the booster cylinder 2 in conventional steam turbine arrangements. This significantly improves economic efficiency under partial load conditions.

[0048] Furthermore, because boost cylinder 2 is coaxially arranged with the conventional steam turbine, the boost module does not require an additional generator 6 and corresponding auxiliary power lines, reducing initial investment. Under high load, boost cylinder 2 remains idle, avoiding the energy loss associated with maintaining cooling flow and achieving high-load, efficient operation.

[0049] Furthermore, because booster cylinder 2 is coaxially arranged with the conventional steam turbine, it maintains rated speed after removal, avoiding the need for a sudden restart when booster cylinder 2 is restarted. This increases the speed of booster cylinder 2 removal and commissioning, and provides greater operational flexibility. Therefore, compared to a split-shaft arrangement, this technical measure achieves a wide range of increased main steam pressure under partial loads and efficient operation under high loads. It also simplifies system configuration, reduces construction costs, and improves operational flexibility.

[0050] like Figure 1 As shown, the wide-range feedwater temperature increaser 24 is arranged on the boiler feedwater pipe 81 upstream of the zero high-pressure heater 32 of the original heat recovery system 8; the steam inlet of the wide-range feedwater temperature increaser 24 is connected to the steam extraction port of the booster cylinder 2 through the first steam extraction pipeline 22. In specific implementation, the side close to the boiler 1 is the upstream. In actual use, the wide-range feedwater temperature increaser 24 is a high-pressure heater. The wide-range feedwater temperature increaser 24 is shut down at high load and put into operation at low load, and the steam source comes from the steam extraction port of the booster cylinder 2. Under low load, the booster cylinder 2 and the wide-range feedwater temperature increaser 24 are put into operation, and the main steam first enters the booster cylinder 2, and the exhaust steam of the booster cylinder 2 supplies steam to the high-pressure cylinder 3 and the wide-range feedwater temperature increaser 24; due to the configuration of the wide-range feedwater temperature increaser 24, the partial load feedwater temperature can be further increased, which can greatly improve the partial load economy and also help to maintain the dry operation and denitrification input of the boiler 1 during deep adjustment.

[0051] The first steam extraction pipeline 22 is connected to the condenser 7 through the condenser branch 23, and a first regulating valve 231 is provided on the condenser branch 23; the steam inlet end of the condenser branch 23 is arranged on the first steam extraction pipeline 22 between the steam extraction port of the booster cylinder 2 and the first steam extraction valve 221. In specific implementation, when the unit is running at low load, the booster cylinder 2 is put into operation, and its steam intake comes from the superheater of the boiler 1, and the exhaust steam is sent to the high-pressure cylinder 3 and the feed water wide-range temperature increaser 24. When the unit is running at high load, the booster cylinder 2 of the steam turbine does not take in steam, and the exhaust steam from the steam extraction port of the booster cylinder 2 is discharged to the condenser 7, and the booster cylinder 2 maintains the rated speed and idles to prevent the internal flow and blast of the booster cylinder 2. Among them, the first regulating valve 231 remains open, so that the steam retained in the booster cylinder 2 and the shaft seal steam are sent to the condenser 7.

[0052] like Figure 1 As shown, the first steam extraction port of the high-pressure cylinder 3 is connected to the boiler 1 via the reheat steam cold-end pipeline 12. The second steam extraction port of the high-pressure cylinder 3 is connected to the steam inlet of the zero high-pressure heater 32 via a second steam extraction pipeline 31. The zero high-pressure heater 32 is located on the boiler feedwater pipe 81 between the wide-range feedwater attenuator 24 and the original heat recovery system 8. The second steam extraction pipeline 31 is equipped with a second steam extraction valve 311. In practice, the original heat recovery system 8 is connected to the condenser 7 via a pipeline. When the high-pressure cylinder 3 is in operation, the second steam extraction valve 311 remains open, continuously supplying heating steam to the zero high-pressure heater 32.

[0053] The boost cylinder 2 is designed to have a higher speed than the main engine, and a reduction gearbox (not shown) is added between the boost cylinder 2 and the high-pressure cylinder 3. This technical measure can further improve the flow efficiency of the boost cylinder 2.

[0054] A clutch (not shown) is configured between the boost cylinder 2 and the high-pressure cylinder 3. In actual use, by configuring a clutch between the boost cylinder 2 and the high-pressure cylinder 3, after the boost cylinder 2 is shut off, the boost cylinder 2 is disengaged from the main shaft, and the boost cylinder 2 maintains the cranking speed or reduces the speed to 0. This technical measure enables rapid switching of operating modes. For example, when the boost cylinder 2 is required to operate, the clutch engages, and the boost cylinder 2 can be put into operation efficiently. When the boost cylinder 2 is not required to operate, the clutch disengages, and the boost cylinder 2 is disengaged from the main shaft, maintaining the cranking speed or reducing the speed to 0. This rapid switching capability greatly improves the operational flexibility of the system.

[0055] At the same time, whether it is a high-load or low-load working condition, the system can flexibly adjust the operating state of the booster cylinder 2 according to demand, thereby better adapting to various complex working conditions. Easy maintenance: When the booster cylinder 2 is disengaged from the main shaft, the wear of the booster cylinder 2 in the non-working state can be effectively reduced. This helps to extend the service life of the booster cylinder 2 and reduce the maintenance cost of the equipment. Easy maintenance: After the booster cylinder 2 is cut off from operation, since it is disengaged from the main shaft, maintenance personnel can more conveniently inspect and maintain the booster cylinder 2 without worrying about the mutual influence between it and the main shaft. Improved economy: When the booster cylinder 2 is not needed to work, it can be cut off and disengaged from the main shaft in time to reduce unnecessary energy consumption, thereby improving the economy of the system. Therefore, the adoption of this technical measure has the advantages of being able to quickly switch operating modes and significantly optimize operating economy.

[0056] A method for operating a high-efficiency thermal system based on a wide-range boost module, comprising:

[0057] When the unit is running at high load:

[0058] The first steam inlet regulating valve 1121 is fully closed, the boost cylinder 2 is not put into operation, and only the rated speed is maintained;

[0059] The third steam inlet regulating valve 114 is fully opened, and the second steam inlet regulating valve 1131 is fully opened, and the main steam directly enters the high-pressure cylinder 3;

[0060] The first exhaust steam pipeline 21 is fully closed and the first regulating valve 231 is fully opened, so that the exhaust steam of the booster cylinder 2 is connected to the condenser 7;

[0061] The first steam extraction valve 221 is fully closed, the second steam extraction valve 311 is open, the feedwater wide-range temperature increaser 24 is not put into operation, and the zero high-pressure heater 32 and the original heat recovery system 8 are put into normal operation;

[0062] When the unit is running at low load:

[0063] The first steam inlet regulating valve 1121 is fully opened, the third steam inlet regulating valve 114 is fully closed, and the boost cylinder 2 is put into operation;

[0064] The first exhaust valve 211 is fully opened, and the second steam inlet regulating valve 1131 is fully opened, and the main steam is discharged into the high-pressure cylinder 3 through the boost cylinder 2;

[0065] The first regulating valve 231 is fully closed, the first extraction valve 221 is opened, the exhaust steam of the booster cylinder 2 is discharged into the feed water wide temperature increaser 24, and the feed water wide temperature increaser 24 is put into operation.

[0066] The second steam extraction valve 311 is fully opened, and the No. 0 high-pressure heater 32 and the original heat recovery system 8 are put into normal operation.

[0067] This operating method not only improves the economy and operating efficiency of the system, but also enhances environmental friendliness and simplifies maintenance and operation by flexibly switching operating modes, optimizing thermal cycles, and reducing heat consumption.

[0068] During actual operation, the high-efficiency thermal system based on the wide-range boost module also includes operation methods for the unit load reduction process and the unit load increase process.

[0069] Specifically, when the unit reduces load:

[0070] The main steam pressure and feed water temperature gradually decrease, and the unit heat consumption gradually increases; after the unit load is reduced to a certain load.

[0071] Gradually open the first steam inlet regulating valve 1121, close the third steam inlet regulating valve 114, open the first steam exhaust valve 211, and close the first regulating valve 231; gradually put the boost cylinder 2 into operation; keep the second steam inlet regulating valve 1131 fully open; gradually switch the exhaust steam of the boost cylinder 2 from going to the condenser 7 to going to the high-pressure cylinder 3.

[0072] By adopting this technical measure, the main steam pressure of the load can reach the rated value; after the booster cylinder 2 is put into operation, the first steam extraction valve 221 is gradually opened and the feed water wide range temperature increaser 24 is put into operation.

[0073] Specifically, when the unit increases load:

[0074] Gradually close the first steam inlet regulating valve 1121, open the third steam inlet regulating valve 114, close the first steam exhaust valve 211, and open the first regulating valve 231. Gradually cut off the boost cylinder 2, and gradually switch the exhaust steam of the boost cylinder 2 from going to the feedwater wide-range temperature increaser 24 to going to the condenser 7.

[0075] When the first steam inlet regulating valve 1121 and the first steam exhaust valve 211 are fully closed, and the third steam inlet regulating valve 114 and the second steam inlet regulating valve 1131 are fully opened; the boost cylinder 2 is completely cut off and only maintains idling at the rated speed; in the process of cutting off the boost cylinder 2, the first steam extraction valve 221 is gradually closed, and the water supply wide-range temperature increaser 24 is cut off.

[0076] This operating method not only improves the economy and operating efficiency of the system, but also enhances environmental friendliness and simplifies maintenance and operation by flexibly switching operating modes, optimizing thermal cycles, and reducing heat consumption.

[0077] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A high-efficiency thermal system based on a wide-range booster module, comprising a boiler and a coaxial arrangement and sequential connection of a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, and a generator; the boiler is connected to the intermediate-pressure cylinder via a reheat steam hot section pipeline, and the intermediate-pressure cylinder and the low-pressure cylinder are connected via a connecting pipe; the low-pressure cylinder is connected to a condenser via a condensing pipeline; and the condenser is connected to the original heat recovery system via a pipeline. It is characterized by: It also includes a wide-width boost module, wherein the boost cylinder and the high-pressure cylinder of the wide-width boost module are coaxially arranged; The main steam pipeline includes a main steam pipeline main pipe, one end of which is connected to the boiler, and the other end of which is connected in parallel to the first steam inlet branch and the second steam inlet branch; The first steam inlet branch is used to connect to the steam inlet of the boost cylinder; the second steam inlet branch is used to connect to the steam inlet of the high-pressure cylinder; the first steam inlet branch and the second steam inlet branch are respectively provided with a first steam inlet regulating valve and a second steam inlet regulating valve; The exhaust port and the extraction port of the boost cylinder are connected to the second steam inlet branch and the feedwater wide-range temperature increaser through the first exhaust pipe and the first extraction pipe respectively; The first exhaust steam pipeline and the first extraction steam pipeline are respectively provided with a first exhaust steam valve and a first extraction steam valve; One end of the first exhaust pipe of the boost cylinder is connected to the exhaust port of the boost cylinder, and the other end is connected to the On the second steam branch road, A third steam inlet regulating valve is provided on the second steam inlet branch between the first exhaust steam pipeline and the first steam inlet branch.

2. The high-efficiency thermal system based on the wide-range boost module according to claim 1 is characterized in that: The wide-range feed water temperature increaser is arranged on the boiler feed water pipe upstream of the zero high pressure pump of the original heat recovery system; the steam inlet of the wide-range feed water temperature increaser is connected to the steam extraction port of the boosting cylinder through the first steam extraction pipeline.

3. The high-efficiency thermal system based on the wide-width boost module according to claim 1 or 2, characterized in that: The first steam extraction pipeline is connected to the condenser through a condenser branch, and a first regulating valve is provided on the condenser branch; the steam inlet end of the condenser branch is arranged on the first steam extraction pipeline between the steam extraction port of the boost cylinder and the first steam extraction valve.

4. The high-efficiency thermal system based on a wide-range boost module according to claim 1 is characterized in that: The first steam extraction port of the high-pressure cylinder is connected to the boiler through a reheat steam cold section pipeline; the second steam extraction port of the high-pressure cylinder is connected to the steam inlet of the No. 0 high-pressure heater through a second steam extraction pipeline, and the No. 0 high-pressure heater is arranged on the boiler feed water pipe between the wide-range feed water temperature increaser and the original heat recovery system; a second steam extraction valve is provided on the second steam extraction pipeline.

5. The high-efficiency thermal system based on the wide-range boost module according to claim 1 is characterized in that: The boost cylinder is designed to have a high rotation speed, and a reduction gear box is added between the boost cylinder and the high-pressure cylinder.

6. The high-efficiency thermal system based on a wide-range boost module according to claim 1 is characterized in that: A clutch is arranged between the boost cylinder and the high-pressure cylinder.

7. The high-efficiency thermal system based on a wide-range boost module according to claim 1 is characterized in that: The wide-range feed water temperature increaser is a high-pressure heater.

8. The method for operating a high-efficiency thermal system based on a wide-range boost module according to any one of claims 1 to 7, characterized in that: include: When the unit is running at high load: The first steam inlet regulating valve is fully closed, the boost cylinder is not put into operation, and only the rated speed is maintained; The third steam inlet valve is fully opened, the second steam inlet regulating valve is fully opened, and the main steam directly enters the high-pressure cylinder; The first exhaust pipe is fully closed and the first regulating valve is fully opened, so that the exhaust steam of the booster cylinder is connected to the condenser; The first extraction valve is fully closed, the second extraction valve is open, the wide-range feedwater temperature increaser is not put into operation, and the zero high-pressure heater and the original heat recovery system are put into normal operation; When the unit is running at low load: The first steam inlet regulating valve is fully opened, the third steam inlet valve is fully closed, and the booster cylinder is put into operation; The first exhaust valve is fully opened, the second steam inlet regulating valve is fully opened, and the main steam is discharged into the high-pressure cylinder through the booster cylinder; The first regulating valve is fully closed, the first extraction valve is opened, the exhaust steam of the booster cylinder is discharged into the wide-range feedwater heater, and the wide-range feedwater heater is put into operation. The second steam extraction valve is fully opened, and the No. 0 high-pressure heater and the original heat recovery system are put into operation normally.

9. The method for operating a high-efficiency thermal system based on a wide-range boost module according to claim 8, characterized in that: When the unit is reducing load: The main steam pressure and feed water temperature gradually decrease, and the unit heat consumption gradually increases; after the unit load is reduced to a certain load; Gradually open the first steam inlet regulating valve, close the third steam inlet regulating valve, open the first steam exhaust valve, and close the first regulating valve; gradually put the boost cylinder into operation; keep the second steam inlet regulating valve fully open, and gradually switch the exhaust steam of the boost cylinder from going to the condenser to going to the high-pressure cylinder.

10. The method for operating a high-efficiency thermal system based on a wide-range boost module according to claim 8, characterized in that: When the unit increases load: Gradually close the first steam inlet regulating valve, open the third steam inlet regulating valve, close the first steam exhaust valve, and open the first regulating valve; gradually cut off the booster cylinder, and gradually switch the booster cylinder exhaust steam from going to the feedwater wide-range temperature increaser and high-pressure cylinder to going to the condenser; When the first steam inlet regulating valve and the first steam exhaust valve are fully closed, and the third steam inlet regulating valve and the first regulating valve are fully opened; the boost cylinder is completely cut off and only the rated speed is maintained and idling; During the process of cutting off the boost cylinder, gradually close the first steam extraction valve and cut off the wide-range feedwater temperature booster.

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