Small steam turbine system and use method of small steam turbine system

Abstract

The invention relates to a small steam turbine system and a using method of the small steam turbine system. The small steam turbine system comprises a reheater, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a first condenser, a first electric generator, a second condenser, a second electric generator and a small steam turbine. The high-pressure cylinder is connected with the reheater and the intermediate-pressure cylinder, the intermediate-pressure cylinder is connected with the low-pressure cylinder, the low-pressure cylinder and the intermediate-pressure cylinder are both connected with the small steam turbine, and the low-pressure cylinder is connected with the first condenser; the small turbine is connected with the first condenser and the second condenser; the first generator is connected with the low-pressure cylinder, and the second generator is connected with the small turbine. The small steam turbine system can improve operation efficiency, reduce coal consumption and improve heat regeneration efficiency.

Description

Technical Field

[0001] The present disclosure relates to the technical field of steam turbines, and in particular, to a small steam turbine system and a method for using the small steam turbine system. Background Art

[0002] New energy sources such as wind and solar energy will gradually become the main source of electricity in my country. However, the intermittent and unstable nature of these new energy sources requires traditional energy sources such as thermal power to provide necessary regulatory support to ensure a stable supply of electricity. This poses a major challenge to the existing coal-fired power industry, forcing it to not only transform to low-carbon, but also to transform from the main power supply to a regulating power source.

[0003] Under the background of deep peak regulation, the unit is in a high load state. Due to the selection problem, the last stage blades of the steam turbine have insufficient steam expansion margin. When operating under low load, the reheating temperature is low, and the last stage blades of the steam turbine will also have water erosion problems, affecting the safe operation of the unit and the efficiency of the heat recovery system. According to incomplete statistics, taking a subcritical 600,000-kilowatt unit as an example, the coal consumption of the 1050 long blade and the 915 short blade at full load conditions differ by 3-5g / kWh. For the same blade, the coal consumption of the unit at 75% load is 5g / kWh higher than that at 100% load, 50% load is 13g / kWh higher than that at 100% load, and 30% load is 30g / kWh higher than that at 100% load. Therefore, a small steam turbine full-process efficiency improvement system adapted to deep peak regulation is proposed, which is of great significance to improving the operating efficiency of the thermal system, reducing coal consumption, improving heat recovery efficiency, and reducing the power consumption rate of the plant. Summary of the invention

[0004] The purpose of the present disclosure is to provide a small steam turbine system and a method for using the small steam turbine system to solve the technical problems existing in the related art.

[0005] In order to achieve the above-mentioned object, the present disclosure provides a small steam turbine system, which includes a reheater, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a first condenser, a first generator, a second condenser, a second generator and a small steam turbine; The high-pressure cylinder is connected to the reheater and the intermediate-pressure cylinder, the intermediate-pressure cylinder is connected to the low-pressure cylinder, the low-pressure cylinder and the intermediate-pressure cylinder are both connected to the small steam turbine, and the low-pressure cylinder is connected to the first condenser; The small steam turbine is connected to the first condenser and the second condenser; the first generator is connected to the low-pressure cylinder, and the second generator is connected to the small steam turbine.

[0006] Optionally, the small steam turbine system includes a reheat pipeline, a high-pressure pipeline, a medium-high-pressure pipeline, a medium-low-pressure pipeline, a medium-low-pressure main pipeline, a first branch pipeline, and a second branch pipeline; The reheat pipeline connects the reheat pipeline and the small steam turbine; The high-pressure pipeline connects the high-pressure cylinder and the reheater; The medium-pressure pipeline connects the high-pressure cylinder and the medium-pressure cylinder; The medium- and low-pressure pipelines connect the medium-pressure cylinder and the low-pressure cylinder; The medium- and low-pressure main lines are connected to the medium-pressure cylinder, one end of the first branch line is connected to the medium- and low-pressure main lines, the other end of the first branch line is connected to the small steam turbine, one end of the second branch line is connected to the medium- and low-pressure main lines, and the other end of the second branch line is connected to the low-pressure cylinder.

[0007] Optionally, the small steam turbine system also includes a first condensing pipeline and a second condensing pipeline, one end of the second condensing pipeline is connected to the small steam turbine, the other end of the second condensing pipeline is connected to the second condenser, one end of the first condensing pipeline is connected to the second condensing pipeline, and the other end of the first condensing pipeline is connected to the first condenser.

[0008] Optionally, the number of the low-pressure cylinders is two, the number of the first condensers is two and they are arranged in a one-to-one correspondence with the low-pressure cylinders, and the number of the second branch pipelines is two and they are arranged in a one-to-one correspondence with the low-pressure cylinders.

[0009] Optionally, the small steam turbine system further includes a control valve, and the control valve is arranged in the first branch pipeline.

[0010] The present disclosure also provides a method for using a small steam turbine system, the method for using the small steam turbine system being applied to the small steam turbine system, the method for using the small steam turbine system comprising: Obtain the current operating load data of the unit; Based on the load data, comparing with a target load range; When the load data is greater than the target load range, it is determined to be a high load condition and a high load operation is performed; When the load data is within the target load range, determining it as a target load condition and performing a target load operation; When the load data is less than the target load range, it is determined to be a low load condition and a low load operation is performed.

[0011] Optionally, when the load data is greater than the target load range, determining that it is a high load condition and performing a high load operation includes: Obtaining the working efficiency of the low-pressure cylinder; Determining whether the working efficiency of the low-pressure cylinder is at a target efficiency; If the low-pressure cylinder efficiency is lower than the target efficiency, the gas source of the small steam turbine is switched to the medium- and low-pressure main pipelines for steam extraction; The amount of steam extracted from the medium and low pressure main lines is controlled to keep the working efficiency of the low pressure cylinder not less than the target efficiency.

[0012] Optionally, when the load data is less than the target load range, determining that it is a low load condition and performing a low load operation includes: When the load data drops to less than or equal to half of the target load range; Switching the gas source of the small steam turbine to the steam extraction position before the reheater; A certain amount of steam is extracted from the cold section to adjust the reheat steam temperature of the reheater.

[0013] Optionally, when the load data is within the target load range, determining the target load condition and performing the target load operation includes: When the load data is within the target load range, the steam used by the small steam turbine is extracted from the fourth stage steam extraction pipeline of the main steam turbine to make the low pressure cylinder at the target efficiency.

[0014] Optionally, obtaining the current operating load data of the unit includes: Start the information collection system for monitoring and collecting the real-time operating load of the unit; Identify and activate load sensors installed at key locations of the unit to monitor physical quantities directly related to the unit load; periodically or continuously reading a current value from the load sensor; The collected data is transmitted to the central processing unit via a wired or wireless communication network for storage and analysis.

[0015] In the above technical solution, firstly, the small steam turbine system includes multiple working sections such as a high-pressure cylinder, a medium-pressure cylinder, and a low-pressure cylinder. Through multi-stage series connection, the energy of steam can be more effectively utilized to improve the thermal efficiency of the entire system.

[0016] Secondly, the high-pressure cylinder is connected to the reheater, which means that after the steam passes through the high-pressure cylinder to do work, it can be heated again and then continue to do work through the medium-pressure cylinder and the low-pressure cylinder. This can significantly increase the average temperature of the steam and thus improve thermal efficiency.

[0017] In addition, both the low-pressure cylinder and the intermediate-pressure cylinder are connected to the small steam turbine, indicating that after the main steam turbine completes the initial work, the remaining steam can be reused by the small steam turbine, thereby improving the utilization rate of the steam.

[0018] In addition, the low-pressure cylinder is connected to the first condenser, which helps to recover the waste heat after the steam does work and further improve the overall energy efficiency of the system.

[0019] In addition, the small steam turbine system is equipped with a first generator and a second generator, which means that even in the case of large load changes, the system can maintain stable power output by adjusting steam turbines of different levels, thereby improving the flexibility of power generation.

[0020] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 Schematic diagram of a small steam turbine system according to an embodiment of the present disclosure.

[0022] Description of Reference Numerals 1. Reheater; 2. High-pressure cylinder; 3. Medium-pressure cylinder; 4. Low-pressure cylinder; 5. First condenser; 6. First generator; 7. Second condenser; 8. Second generator; 9. Small steam turbine; 101. Reheat pipeline; 102. High-pressure pipeline; 103. Medium-high-pressure pipeline; 104. Medium-low-pressure pipeline; 105. Medium-low-pressure main pipeline; 106. First branch pipeline; 107. Second branch pipeline; 200. Control valve. DETAILED DESCRIPTION

[0023] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0024] Reference Figure 1 As shown, the present disclosure provides a small steam turbine system, which includes a reheater 1, a high-pressure cylinder 2, an intermediate-pressure cylinder 3, a low-pressure cylinder 4, a first condenser 5, a first generator 6, a second condenser 7, a second generator 8 and a small steam turbine 9; the high-pressure cylinder 2 is connected to the reheater 1 and the intermediate-pressure cylinder 3, the intermediate-pressure cylinder 3 is connected to the low-pressure cylinder 4, the low-pressure cylinder 4 and the intermediate-pressure cylinder 3 are both connected to the small steam turbine 9, and the low-pressure cylinder 4 is connected to the first condenser 5; the small steam turbine 9 is connected to the first condenser 5 and the second condenser 7; the first generator 8 is connected to the low-pressure cylinder 4, and the second generator 8 is connected to the small steam turbine 9.

[0025] In the above technical solution, firstly, the small steam turbine system includes multiple working sections such as the high-pressure cylinder 2, the medium-pressure cylinder 3, and the low-pressure cylinder 4. Through multi-stage series connection, the energy of steam can be more effectively utilized to improve the thermal efficiency of the entire system.

[0026] Secondly, the high-pressure cylinder 2 is connected to the reheater 1, which means that after the steam passes through the high-pressure cylinder 2 to do work, it can be heated again and then continue to do work through the medium-pressure cylinder 3 and the low-pressure cylinder 4. This can significantly increase the average temperature of the steam and thus improve the thermal efficiency.

[0027] Furthermore, both the low-pressure cylinder 4 and the intermediate-pressure cylinder 3 are connected to the small steam turbine 9, indicating that after the main steam turbine completes the initial work, the remaining steam can be reused by the small steam turbine, thereby improving the utilization rate of the steam.

[0028] In addition, the low-pressure cylinder 4 is connected to the first condenser 5, which helps to recover the waste heat after the steam does work, and further improves the overall energy utilization efficiency of the system.

[0029] In addition, the small steam turbine system is equipped with a first generator 6 and a second generator 8, which means that even in the case of large load changes, the system can maintain stable power output by adjusting steam turbines of different levels, thereby improving the flexibility of power generation.

[0030] In one embodiment, reference Figure 1 As shown, the small steam turbine system includes a reheat pipeline 101, a high-pressure pipeline 102, a medium-high pressure pipeline 103, a medium-low pressure pipeline 104, a medium-low pressure main pipeline 105, a first branch pipeline 106 and a second branch pipeline 107; the high-pressure pipeline 102 connects the high-pressure cylinder 2 and the reheater 1; the reheat pipeline 101 connects the high-pressure pipeline 102 and the small steam turbine 9; the medium-high pressure pipeline 103 connects the high-pressure cylinder 2 and the medium-pressure cylinder 3; the medium-low pressure pipeline 104 connects the medium-pressure cylinder 3 and the low-pressure cylinder 4; the medium-low pressure main pipeline 105 is connected to the medium-pressure cylinder 3, one end of the first branch pipeline 106 is connected to the medium-low pressure main pipeline 105, and the other end of the first branch pipeline 106 is connected to the small steam turbine 9, one end of the second branch pipeline 107 is connected to the medium-low pressure main pipeline 105, and the other end of the second branch pipeline 107 is connected to the low-pressure cylinder 4.

[0031] In this embodiment, first, the high-pressure pipeline 102 connects the high-pressure cylinder 2 and the reheater 1. The reheat cycle design allows the steam to return to the reheater 1 through the high-pressure pipeline 102 for reheating after doing work in the high-pressure cylinder 2, thereby increasing the temperature and pressure of the steam, thereby further doing work in the medium-pressure cylinder 3 and the low-pressure cylinder 4, and improving the energy conversion efficiency of the system.

[0032] Secondly, the medium- and high-pressure pipeline 103 connects the high-pressure cylinder 2 and the medium-pressure cylinder 3. After the steam performs work in the high-pressure cylinder 2, it enters the medium-pressure cylinder 3 through the medium- and high-pressure pipeline 103 and continues to perform work, thus realizing multi-stage utilization of steam and improving energy utilization.

[0033] In addition, the medium- and low-pressure pipeline 104 connects the medium-pressure cylinder 3 and the low-pressure cylinder 4. After the steam performs work in the medium-pressure cylinder 3, it enters the low-pressure cylinder 4 through the medium- and low-pressure pipeline 104, ensuring the full release of steam energy and further improving the system efficiency.

[0034] In another embodiment, referring to Figure 1 As shown, the small steam turbine system also includes a first condensing pipeline 108 and a second condensing pipeline 109, one end of the second condensing pipeline 109 is connected to the small steam turbine 9, and the other end of the second condensing pipeline 109 is connected to the second condenser 7, one end of the first condensing pipeline 108 is connected to the second condensing pipeline 109, and the other end of the first condensing pipeline 108 is connected to the first condenser 5.

[0035] In this embodiment, first, the first condensing pipeline 108 connects the second condensing pipeline 109 and the first condenser 5. This design allows the steam after the small steam turbine 9 works to be transported to the second condenser 7 through the second condensing pipeline 109, and then transported to the first condenser 5 through the first condensing pipeline 108, thereby realizing step-by-step cooling of the steam and improving the cooling efficiency.

[0036] Secondly, the second condensing pipeline 109 connects the small steam turbine 9 and the second condenser 7. The steam exhausted from the small steam turbine 9 can directly enter the second condenser 7 for preliminary cooling and then be sent to the first condenser 5, thereby ensuring efficient recovery of steam.

[0037] Furthermore, the first condensing steam pipeline 108 and the second condensing steam pipeline 109 can flexibly adjust the flow direction of steam according to actual conditions to adapt to different working conditions. For example, in some cases, steam can be selectively sent to the second condenser 7 or the first condenser 5, thereby improving the operational flexibility of the system.

[0038] In addition, the first condensing pipeline 108 can ensure that the steam flows smoothly from the second condenser 7 to the first condenser 5, thereby avoiding the problem of excessive pressure caused by the accumulation of steam in the system and enhancing the safety of the system.

[0039] In addition, through the second condensing pipeline 109, the steam exhausted by the small steam turbine 9 can be directly received by the second condenser 7, which reduces the retention time of the steam in the pipeline and reduces the risks that may occur during the steam condensation process.

[0040] Optionally, refer to Figure 1As shown, two low-pressure cylinders 4 are provided, two first condensers 5 are provided and are arranged one-to-one with the low-pressure cylinders 4, and two second branch pipelines 107 are provided and are arranged one-to-one with the low-pressure cylinders 4. However, the present disclosure does not limit the specific number of low-pressure cylinders 4 and first condensers 5.

[0041] Optionally, refer to Figure 1 As shown, the small steam turbine system further includes a control valve 200, which is disposed in the first branch pipeline 106 to effectively regulate the amount of steam.

[0042] See also Figure 1 As shown, the small steam turbine system includes a main steam passage, a steam bypass one and a steam bypass two.

[0043] Main steam passage: exhaust steam from high-pressure cylinder 2 enters reheater 1 and medium-pressure cylinder 3, exhaust steam from medium-pressure cylinder 3 enters medium-low pressure connecting pipe and low-pressure cylinder 4, exhaust steam from low-pressure cylinder 4 passes through medium-low pressure main pipeline 105 and second branch pipeline 107 to first condenser 5, steam does work, and first generator 6 generates electricity.

[0044] Steam bypass 1: Steam is extracted from the first branch pipeline 106, the steam extraction amount is controlled by the control valve 200, the steam enters the small steam turbine 9 to perform work, and finally is discharged into the second condenser 7 to generate electricity by the second motor 8 as plant electricity.

[0045] Steam bypass 2: 100t / h of steam is extracted from before the reheater 1, enters the small steam turbine 9 to do work, and finally is discharged into the second condenser 7 to generate electricity by the second motor 8 as plant electricity.

[0046] The exhaust steam of the small steam turbine 9 is through two passages. When the steam quantity is sufficient, it is cooled by the first condenser 5. When it is insufficient, it enters the second condenser 7 for cooling, thereby improving the cold end efficiency.

[0047] The specific method of the present invention is divided into three situations.

[0048] The control system first obtains the load condition of the unit and determines whether it deviates from the design value. If it is higher than the design condition, it is judged as a high-load condition. The unit switches the steam source to the medium- and low-pressure main line 105 extraction steam. When it is in the target load range, the four extractions are used as the steam source. When it is lower than the target load range, the cold section extraction steam is used as the steam source. Under high load conditions and target load range conditions, the steam extraction volume of small steam turbine 9 is determined by the efficiency of low-pressure cylinder 4, and the steam extraction volume is used to maintain the highest efficiency of low-pressure cylinder 4; under low load conditions, the steam extraction volume of small steam turbine 9 is determined by the highest heat recovery efficiency of the unit, and the steam extraction volume is used to maintain the highest heat recovery efficiency.

[0049] Method 1: Under high load conditions, obtain the efficiency of the low-pressure cylinder 4 of the main steam turbine, and judge whether the efficiency of the low-pressure cylinder is at the optimal point. When it deviates from the optimal point, obtain the unit load. When it is in high load conditions, the gas source of the small steam turbine 9 is switched to the medium and low pressure main line 105 to extract steam. Under high load conditions, according to the value of the main steam turbine deviating from the design condition and the efficiency of the low-pressure cylinder 4, different amounts of steam are extracted from the medium and low pressure main line 105. The control valve 200 controls the amount of steam extracted from the medium and low pressure main line 105 to keep the efficiency of the low pressure cylinder 4 in the high efficiency range. The small steam turbine 9 adopts steam-electric dual drive technology. When the amount of extracted steam is less than the amount required by the small steam turbine 9, it can be used to supplement the required power. The steam consumed by the small steam turbine 9 is used to drive the feed water pump. The benefits brought by the steam consumed by the small steam turbine 9 for power generation are greater than the benefits lost by the main steam turbine deviating from the design condition.

[0050] Method 2: Under low load conditions, obtain the unit load. When it deviates from the design conditions or even below 50%, the unit is in deep peak regulation. The gas source of the small steam turbine 9 is switched to the extraction of steam before the reheater 1. Based on improving the system heat recovery efficiency, different amounts of steam are extracted from the cold section to adjust the reheat steam temperature to maintain the highest heat recovery efficiency. After increasing the reheat steam temperature, the water erosion problem of the last stage blades in the low-pressure cylinder 4 will be reduced, and the safety of the unit will be improved. The amount of steam extracted from the medium and low pressure main line 105 is controlled by the control valve 200. At the same time, extracting steam from the front of the reheater 1 will also increase the steam flow rate in the reheater 1, and the increase in the steam flow rate will also increase the heat exchange efficiency of the reheater 1. At this time, the steam amount of the gas source of the small steam turbine 9 is greater than the required steam amount, and the excess steam is used for the second generator 8 to generate electricity and for plant electricity, reducing the coal consumption for power supply.

[0051] Method three: Obtain the status of the unit. When the unit is in the target load range, the air source of the small steam turbine 9 adopts four-extraction to keep the low-pressure cylinder 4 at the best efficiency.

[0052] In addition, obtaining the current operating load data of the unit includes: starting the information collection system for monitoring and collecting the real-time operating load of the unit; identifying and enabling the load sensors installed at key locations of the unit to monitor physical quantities directly related to the unit load; periodically or continuously reading the current value from the load sensor; and transmitting the collected data to the central processing unit for storage and analysis via a wired or wireless communication network.

[0053] In this implementation, first, it is ensured that the system can obtain the operating status data of the unit in real time, providing basic data support for subsequent analysis and decision-making. Timely grasping the operating status of the unit provides a basis for adjusting the operating parameters, which helps to improve the operating efficiency and safety of the unit.

[0054] Secondly, by installing sensors at key locations, physical quantities closely related to the unit load (such as current, voltage, pressure, temperature, etc.) can be monitored in real time, thereby accurately understanding the actual load conditions of the unit, improving the monitoring accuracy of the unit load, and being able to promptly detect potential problems, prevent failures, and ensure stable operation of the unit.

[0055] In addition, by collecting sensor data regularly or continuously, the real-time and integrity of the data is ensured, which facilitates the analysis of the state changes of the unit at different time points, provides a continuous data stream for unit status analysis, helps to discover trends and anomalies, and optimizes operating strategies.

[0056] In addition, the collected data is transmitted to the central processing unit through a reliable communication network for centralized storage and analysis, ensuring the security and availability of the data. Remote monitoring and centralized management of data are achieved, which facilitates maintenance personnel to obtain information in a timely manner and improves the speed of fault response; it also facilitates the analysis of a large amount of historical data, the mining of operating rules, and the optimization of system performance.

[0057] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0058] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0059] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A small steam turbine system, characterized in that: The small steam turbine system includes a reheater, a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a first condenser, a first generator, a second condenser, a second generator and a small steam turbine; The high-pressure cylinder is connected to the reheater and the intermediate-pressure cylinder, the intermediate-pressure cylinder is connected to the low-pressure cylinder, the low-pressure cylinder and the intermediate-pressure cylinder are both connected to the small steam turbine, and the low-pressure cylinder is connected to the first condenser; The small steam turbine is connected to the first condenser and the second condenser; the first generator is connected to the low-pressure cylinder, and the second generator is connected to the small steam turbine.

2. The small steam turbine system according to claim 1, characterized in that: The small steam turbine system includes a reheat pipeline, a high-pressure pipeline, a medium-high-pressure pipeline, a medium-low-pressure pipeline, a medium-low-pressure main pipeline, a first branch pipeline and a second branch pipeline; The reheat pipeline connects the high-pressure pipeline and the small steam turbine; The high-pressure pipeline connects the high-pressure cylinder and the reheater; The medium-pressure pipeline connects the high-pressure cylinder and the medium-pressure cylinder; The medium- and low-pressure pipelines connect the medium-pressure cylinder and the low-pressure cylinder; The medium- and low-pressure main lines are connected to the medium-pressure cylinder, one end of the first branch line is connected to the medium- and low-pressure main lines, the other end of the first branch line is connected to the small steam turbine, one end of the second branch line is connected to the medium- and low-pressure main lines, and the other end of the second branch line is connected to the low-pressure cylinder.

3. The small steam turbine system according to claim 2, characterized in that: The small steam turbine system also includes a first condensing pipeline and a second condensing pipeline, one end of the second condensing pipeline is connected to the small steam turbine, the other end of the second condensing pipeline is connected to the second condenser, one end of the first condensing pipeline is connected to the second condensing pipeline, and the other end of the first condensing pipeline is connected to the first condenser.

4. The small steam turbine system according to claim 2, characterized in that: The number of the low-pressure cylinders is two, the number of the first condensers is two and they are arranged in a one-to-one correspondence with the low-pressure cylinders, and the number of the second branch pipelines is two and they are arranged in a one-to-one correspondence with the low-pressure cylinders.

5. The small steam turbine system according to claim 2, characterized in that: The small steam turbine system further includes a control valve, which is arranged in the first branch pipeline.

6. A method for using a small steam turbine system, characterized in that: The method of use is applied to the small steam turbine system according to any one of claims 1 to 5, and the method of use comprises: Obtain the current operating load data of the unit; Based on the load data, comparing with a target load range; When the load data is greater than the target load range, it is determined to be a high load condition and a high load operation is performed; When the load data is within the target load range, determining it as a target load condition and performing a target load operation; When the load data is less than the target load range, it is determined to be a low load condition and a low load operation is performed.

7. The method for using the small steam turbine system according to claim 6, characterized in that: When the load data is greater than the target load range, determining that it is a high load condition and performing a high load operation includes: Obtaining the working efficiency of the low-pressure cylinder; Determining whether the working efficiency of the low-pressure cylinder is at a target efficiency; If the low-pressure cylinder efficiency is lower than the target efficiency, the gas source of the small steam turbine is switched to the medium- and low-pressure main pipelines for steam extraction; The amount of steam extracted from the medium and low pressure main lines is controlled to keep the working efficiency of the low pressure cylinder not less than the target efficiency.

8. The method for using the small steam turbine system according to claim 6, characterized in that: When the load data is less than the target load range, determining that it is a low load condition and performing a low load operation includes: When the load data drops to less than or equal to half of the target load range; Switching the gas source of the small steam turbine to the steam extraction position before the reheater; A certain amount of steam is extracted from the cold section to adjust the reheat steam temperature of the reheater.

9. The method for using the small steam turbine system according to claim 6, characterized in that: When the load data is within the target load range, determining the target load condition and performing the target load operation includes: When the load data is within the target load range, the steam used by the small steam turbine is extracted from the fourth stage steam extraction pipeline of the main steam turbine to make the low pressure cylinder at the target efficiency.

10. The method for using a small steam turbine system according to claim 6, characterized in that: The obtaining of the current operating load data of the unit includes: Start the information collection system for monitoring and collecting the real-time operating load of the unit; Identify and activate load sensors installed at key locations of the unit to monitor physical quantities directly related to the unit load; periodically or continuously reading a current value from the load sensor; The collected data is transmitted to the central processing unit via a wired or wireless communication network for storage and analysis.

Images