Steam turbine system

Abstract

The utility model relates to a steam turbine system which comprises a first high-pressure cylinder and a second high-pressure cylinder, each high-pressure cylinder communicates with a boiler, and the steam bearing load capacity of the first high-pressure cylinder is larger than that of the second high-pressure cylinder; the at least one medium-pressure cylinder is communicated with the boiler; at least one pair of low-pressure cylinders, wherein each pair of low-pressure cylinders is communicated with one medium-pressure cylinder; under the condition that the main steam flow of the steam turbine system is larger than a first preset main steam flow threshold value, main steam generated by the boiler flows to the first high-pressure cylinder till the first high-pressure cylinder is filled with the main steam, the remaining main steam flows to the second high-pressure cylinder, and reheat steam flows to at least one intermediate-pressure cylinder till the second high-pressure cylinder is filled with the reheat steam; and secondary reheat steam generated in each medium-pressure cylinder flows to the pair of low-pressure cylinders communicated with the medium-pressure cylinder. By means of the method, the steam turbine can efficiently conduct steam treatment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automatic control, in particular to a steam turbine system. BACKGROUND

[0002] The unit power generation is a complex energy conversion process, involving the mutual transformation of multiple energy forms. Taking a coal-fired unit as an example, the coal-fired unit mainly consists of a boiler, a steam turbine, a generator and an auxiliary system. Among them, in the boiler, coal is sent into the combustion chamber for combustion to release a large amount of heat energy, and the feed water in the boiler is heated and evaporated by the heating surface to form high-temperature and high-pressure steam. The steam enters the steam turbine and expands on the blades of each stage to push the blades to rotate, thereby converting heat energy into mechanical energy. The mechanical energy output by the steam turbine is converted into electrical energy by the generator and output to the outside through the power transmission line. That is, the steam turbine is used to convert the obtained steam to realize the normal power generation of the coal-fired unit.

[0003] In the traditional technology, taking the coal-fired unit as an example, the coal-fired unit usually aims at multi-power generation, so the steam turbine is usually designed with one high-pressure cylinder, one medium-pressure cylinder and two low-pressure cylinders, and these cylinders are designed according to the rated working condition to ensure the maximum efficiency of the steam turbine at the rated working condition and ensure the power generation of the coal-fired unit. Among them, the high-pressure cylinder is located at the front of the steam turbine and is the initial stage of the main steam entering the cylinder. The exhaust steam of the high-pressure cylinder enters the boiler reheater to be heated to generate reheated steam. The reheated steam enters the medium-pressure cylinder to do work, and the exhaust steam of the medium-pressure cylinder enters the low-pressure cylinder.

[0004] However, the current steam turbine has the problem of inefficient steam treatment. CONTENT OF THE INVENTION

[0005] Therefore, it is necessary to provide a steam turbine system for efficient steam treatment in view of the above technical problems.

[0006] In a first aspect, the present application provides a steam turbine system, which comprises:

[0007] a first high-pressure cylinder and a second high-pressure cylinder, each of which is in communication with the boiler, wherein the steam load of the first high-pressure cylinder is greater than the steam load of the second high-pressure cylinder;

[0008] at least one medium-pressure cylinder, which is in communication with the boiler;

[0009] at least one pair of low-pressure cylinders, each pair of which is in communication with one medium-pressure cylinder;

[0010] When the main steam flow rate of the turbine system is greater than a first preset main steam flow rate threshold, the main steam generated by the boiler flows to the first high-pressure cylinder to drive the generator blades corresponding to the first high-pressure cylinder to rotate until the first high-pressure cylinder is filled. The remaining main steam flows to the second high-pressure cylinder to drive the generator blades corresponding to the second high-pressure cylinder to rotate. The secondary main steam flowing out of the first high-pressure cylinder and the second high-pressure cylinder flows back to the boiler. The boiler heats the secondary main steam to generate reheat steam. The reheat steam flows to the at least one intermediate-pressure cylinder to drive the generator blades corresponding to the at least one intermediate-pressure cylinder to rotate. The secondary reheat steam generated in each intermediate-pressure cylinder flows to a pair of low-pressure cylinders connected to the intermediate-pressure cylinder to drive the generator blades corresponding to the connected pair of low-pressure cylinders to rotate.

[0011] The aforementioned steam turbine system includes: a first high-pressure cylinder and a second high-pressure cylinder, each of which is connected to a boiler, wherein the steam load capacity of the first high-pressure cylinder is greater than that of the second high-pressure cylinder; at least one intermediate-pressure cylinder, which is connected to the boiler; and at least one pair of low-pressure cylinders, each pair of low-pressure cylinders being connected to one intermediate-pressure cylinder. When the main steam flow rate of the steam turbine system is greater than a first preset main steam flow rate threshold, the main steam generated by the boiler is preferentially directed to the first high-pressure cylinder, which has a larger steam load capacity, to drive the generator blades corresponding to the first high-pressure cylinder to rotate until the first high-pressure cylinder is full. Only then is the remaining main steam directed to the second high-pressure cylinder to drive the generator blades corresponding to the second high-pressure cylinder to rotate. The secondary main steam flowing out of the first and second high-pressure cylinders flows back to the boiler, where it is heated to generate reheat steam. The reheat steam flows to at least one intermediate-pressure cylinder to drive the generator blades corresponding to the at least one intermediate-pressure cylinder to rotate. The secondary reheat steam generated in each intermediate-pressure cylinder flows to a pair of low-pressure cylinders connected to the intermediate-pressure cylinders to drive the generator blades corresponding to the connected pair of low-pressure cylinders to rotate. Throughout the process, by designing two high-pressure cylinders, at least one intermediate-pressure cylinder, and at least one pair of low-pressure cylinders instead of one high-pressure cylinder, one intermediate-pressure cylinder, and one low-pressure cylinder in the prior art, it is possible to reduce the power consumption of the turbine system by eliminating the need for all pressure cylinders to work or work simultaneously when the main steam flow of the turbine system is greater than the first preset main steam flow threshold. This allows the turbine to maintain a high steam processing efficiency even under non-rated operating conditions. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the turbine system in one embodiment;

[0014] Figure 2 This is a schematic diagram of the power bearing connection of each stage of the steam pressure cylinder in a steam turbine system in one embodiment;

[0015] Figure 3 This is a schematic diagram of the overall structure of a steam turbine system under the first connection method in one embodiment;

[0016] Figure 4 This is a schematic diagram of the turbine system under the second connection method in one embodiment;

[0017] Figure 5 This is a schematic diagram of the turbine system under the third connection method in one embodiment. Detailed Implementation

[0018] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0020] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0021] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0022] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0023] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0024] Taking coal-fired power units as an example, power generation is a complex energy conversion process involving the interconversion of multiple energy forms. A coal-fired power unit mainly consists of a boiler, a steam turbine, a generator, and auxiliary systems. In the boiler, coal is fed into the combustion chamber for combustion, releasing a large amount of heat energy. Feedwater in the boiler is heated and evaporated through heating surfaces, forming high-temperature, high-pressure steam. After entering the steam turbine, the steam expands on the blades at each stage, driving the blades to rotate, thereby converting heat energy into mechanical energy. The mechanical energy output by the steam turbine is converted into electrical energy by the generator and then transmitted to the outside world through power transmission lines.

[0025] In the past, when power units were built, the goal was usually to generate as much power as possible. Therefore, steam turbines were typically designed with one high-pressure cylinder, one intermediate-pressure cylinder, and two low-pressure cylinders. These cylinders were designed according to rated operating conditions to ensure the maximum efficiency of the steam turbine under rated conditions and to guarantee the power generation of the unit. Among them, the high-pressure cylinder is located at the front of the steam turbine and is the initial stage where the main steam enters the cylinder. The exhaust steam from the high-pressure cylinder enters the boiler reheater for heating and then enters the intermediate-pressure cylinder to do work. The exhaust steam from the intermediate-pressure cylinder enters the low-pressure cylinder. The exhaust steam from doing work in the low-pressure cylinder enters the condenser, condenses into water, and then enters the regenerator.

[0026] However, with the development of new energy sources and the construction of new power systems, coal-fired power is gradually transforming into a regulating and reliable power source. Large-capacity supercritical units generally operate at non-rated main steam flow rates, which cannot fully utilize the high efficiency advantage of rated load. It is expected that in the future, it will become the norm for my country's thermal power units to operate at partial load for a long time, which will affect the actual coal consumption of the units.

[0027] For example, when the steam turbine is operating at a non-rated main steam flow rate, the steam intake of the steam turbine will be reduced accordingly, resulting in a mismatch between the steam flow rate, pressure, temperature and other parameters and the design values.

[0028] Specifically, the flow rate decreases: When the steam turbine is operating at a non-rated main steam flow rate, the steam intake of the turbine will also decrease accordingly due to the reduced external load demand. However, the steam turbine is designed for the rated steam intake flow rate, and its efficiency and coal consumption are relatively high under rated operating conditions. The reduced steam intake flow rate under non-rated main steam flow rate results in a larger flow area for the turbine designed for rated load. The non-rated main steam flow rate sliding pressure operation reduces the steam intake pressure, leading to a decrease in the main steam pressure and reheat steam pressure of the steam turbine, and a decrease in cycle efficiency.

[0029] Pressure and temperature changes: As the steam flow rate decreases, the main steam pressure and temperature may also change. These changes may lead to a decrease in the thermal energy conversion efficiency of the steam, thereby further affecting the performance of the steam turbine.

[0030] In summary, steam turbines designed for rated load have a larger flow area, making them suitable for operation under rated load, resulting in higher efficiency and better economic performance. In recent years, due to the development of new energy power generation, coal-fired power plants have been operating at non-rated main steam flow rates for extended periods. This has led to steam turbines operating at sliding pressures at lower pressures, including main steam pressure, reheat steam pressure, and low-pressure cylinder inlet pressure. This has resulted in a decrease in the thermodynamic cycle efficiency of the steam turbines, rendering steam turbines designed for rated loads unsuitable for current operating loads. This application aims to address this technical problem.

[0031] Therefore, the traditional design of steam turbines should be restructured to adapt to the development and needs of new power systems. Future steam turbine designs should be based on the principle of meeting the high efficiency requirements of the unit under wide load conditions. They should be able to maintain the power generation efficiency under rated operating conditions and also maintain a high power generation efficiency under non-rated main steam flow conditions, thus meeting the current situation of wide load operation. Wide load operation means that the unit can operate efficiently and stably within a wide load range (such as 50%~100% load, or even lower).

[0032] To achieve high efficiency during wide-load operation of the unit, this application proposes a steam turbine system, including: a first high-pressure cylinder and a second high-pressure cylinder, each connected to a boiler, wherein the steam load capacity of the first high-pressure cylinder is greater than that of the second high-pressure cylinder; at least one intermediate-pressure cylinder connected to the boiler; and at least one pair of low-pressure cylinders, each pair connected to one intermediate-pressure cylinder. When the main steam flow rate of the steam turbine system exceeds a first preset main steam flow rate threshold, the main steam generated by the boiler is preferentially directed to the first high-pressure cylinder, which has a larger steam load capacity, to promote... The generator blades corresponding to the first high-pressure cylinder rotate until the first high-pressure cylinder is full. Only then is the remaining main steam flowed to the second high-pressure cylinder to drive the generator blades corresponding to the second high-pressure cylinder to rotate. The secondary main steam flowing out of the first and second high-pressure cylinders flows back to the boiler. The boiler heats the secondary main steam to generate reheat steam. The reheat steam flows to at least one intermediate-pressure cylinder to drive the generator blades corresponding to at least one intermediate-pressure cylinder to rotate. The secondary reheat steam generated in each intermediate-pressure cylinder flows to a pair of low-pressure cylinders connected to the intermediate-pressure cylinder to drive the generator blades corresponding to the connected pair of low-pressure cylinders to rotate. Throughout the process, by designing two high-pressure cylinders, at least one intermediate-pressure cylinder, and at least one pair of low-pressure cylinders instead of one high-pressure cylinder, one intermediate-pressure cylinder, and one low-pressure cylinder in the prior art, it is possible to reduce the power consumption of the turbine system by eliminating the need for all pressure cylinders to work or work simultaneously when the main steam flow rate of the turbine system is greater than a first preset main steam flow rate threshold. This allows the turbine to maintain a high steam processing efficiency even under non-rated operating conditions.

[0033] like Figure 1 As shown, the steam turbine system 1000 provided in this application embodiment includes:

[0034] The first high-pressure cylinder 110 and the second high-pressure cylinder 120 are respectively connected to the boiler 200. The steam load capacity of the first high-pressure cylinder 110 is greater than that of the second high-pressure cylinder 120.

[0035] At least one intermediate pressure cylinder 300 is connected to the boiler 200;

[0036] At least one pair of low-pressure cylinders 400, each pair of low-pressure cylinders 400 being connected to an intermediate-pressure cylinder 300;

[0037] When the main steam flow rate of the steam turbine system 1000 is greater than the first preset main steam flow rate threshold, the main steam generated by the boiler 200 flows to the first high-pressure cylinder 110 to drive the generator blades corresponding to the first high-pressure cylinder 110 to rotate until the first high-pressure cylinder 110 is full. The remaining main steam flows to the second high-pressure cylinder 120 to drive the generator blades corresponding to the second high-pressure cylinder 120 to rotate. The secondary main steam flowing out of the first high-pressure cylinder 110 and the second high-pressure cylinder 120 flows back to the boiler 200. The boiler 200 heats the secondary main steam to generate reheat steam. The reheat steam flows to at least one intermediate-pressure cylinder 300 to drive the generator blades corresponding to at least one intermediate-pressure cylinder 300 to rotate. The secondary reheat steam generated in each intermediate-pressure cylinder 300 flows to a pair of low-pressure cylinders 400 connected to the intermediate-pressure cylinder 300 to drive the generator blades corresponding to the connected pair of low-pressure cylinders 400 to rotate.

[0038] Among them, the steam turbine system 1000 is an important component of the generator set. After the steam from the boiler 200 enters the steam turbine, the steam expands on the blades at each stage and drives the blades to rotate, thereby converting thermal energy into mechanical energy.

[0039] The high-pressure cylinder is a component of the steam turbine. It's the initial stage where the main steam enters the cylinder; at this point, the steam is the primary steam, characterized by high pressure and temperature. The blades of the high-pressure cylinder are typically short, and the impeller diameter is large to accommodate the characteristics of high-pressure, high-temperature steam. The function of the high-pressure cylinder is to convert the high-temperature, high-pressure main steam into mechanical energy, driving the turbine to rotate. The intermediate-pressure cylinder (300) and low-pressure cylinder (400) are the cylinder sections located after the high-pressure cylinder. After initial expansion and work in the high-pressure cylinder, the steam re-enters the boiler (200) for reheating, producing reheated steam. This reheated steam then enters the intermediate-pressure cylinder (300) and low-pressure cylinder (400) to continue expanding and performing work until the steam's thermal energy is completely converted into mechanical energy.

[0040] Steam load capacity refers to the maximum steam intake that each pressure cylinder can withstand. For example, when the steam load capacity of a certain high-pressure cylinder is 60%, a maximum of 60% of the main steam enters that high-pressure cylinder. The ratio between the steam load capacity of the first high-pressure cylinder 110 and the steam load capacity of the second high-pressure cylinder 120 can be 4:6, 5:5, 4.5:5.5, etc. The cooperation between the first high-pressure cylinder 110 and the second high-pressure cylinder 120 can meet the steam intake requirements of the turbine under rated operating conditions. Similarly, the cooperation between all intermediate-pressure cylinders 300 or all low-pressure cylinders 400 can also meet the steam intake requirements of the turbine under rated operating conditions. The first preset main steam flow rate threshold must be less than the main steam flow rate of the turbine under rated operating conditions.

[0041] Specifically, the original steam turbine system 1000 is equipped with one high-pressure cylinder, one intermediate-pressure cylinder 300, and two low-pressure cylinders 400. These cylinders are designed according to rated operating conditions, meaning that the steam turbine can operate efficiently under rated operating conditions. However, under non-rated operating conditions, the steam intake of the steam turbine does not match the design value, thus affecting the efficiency of steam processing. Therefore, this application improves the structure of the steam turbine in the related technology, so that the steam turbine is equipped with two parallel high-pressure cylinders, at least one intermediate-pressure cylinder 300, and at least one pair of low-pressure cylinders 400. The two high-pressure cylinders are the first high-pressure cylinder 110 and the second high-pressure cylinder 120. The steam load capacity of the first high-pressure cylinder 110 and the steam load capacity of the second high-pressure cylinder 120 can be adjusted according to the actual situation of the power plant. In this application, the steam load capacity of the first high-pressure cylinder 110 is set to be greater than the steam load capacity of the second high-pressure cylinder 120.

[0042] Furthermore, each high-pressure cylinder is connected to boiler 200 to receive the main steam generated by boiler 200. In boiler 200, coal is sent into the combustion chamber for combustion, releasing a large amount of heat energy. The feedwater in boiler 200 is heated and evaporated through the heating surface to form high-temperature and high-pressure main steam. In addition to generating main steam, boiler 200 can also generate reheat steam.

[0043] Specifically, when the main steam flow rate of the steam turbine system 1000 exceeds a first preset main steam flow rate threshold, the main steam generated by the boiler 200 flows to the first high-pressure cylinder 110 to drive the corresponding generator blades of the first high-pressure cylinder 110 to rotate until the first high-pressure cylinder 110 is filled. The remaining main steam then flows to the second high-pressure cylinder 120 to drive the corresponding generator blades of the second high-pressure cylinder 120 to rotate, while also meeting the minimum steam intake requirement of the second high-pressure cylinder 120. The secondary main steam flowing out of the first high-pressure cylinder 110 and the second high-pressure cylinder 120 flows back to the boiler 200, where the boiler 200 heats the secondary main steam to generate reheat steam. It can be seen that the main steam generated by boiler 200 preferentially flows to the first high-pressure cylinder 110, which has a larger steam load. Only after the main steam fills the first high-pressure cylinder 110 does it flow to the second high-pressure cylinder 120, which has a smaller steam load. If the main steam does not fill the first high-pressure cylinder 110, it does not need to flow to the second high-pressure cylinder 120, which has a smaller steam load. This reduces the power consumption of the turbine system 1000, thus enabling the turbine to maintain a high steam processing efficiency even under non-rated operating conditions. In practical applications, the function of driving the corresponding generator blades of the steam pressure cylinder to rotate is to convert thermal energy into mechanical energy, so as to realize the power generation of the turbine.

[0044] Furthermore, each intermediate-pressure cylinder 300 is connected to the boiler 200. The reheat steam generated by the boiler 200 will flow to at least one intermediate-pressure cylinder 300 to drive the generator blades corresponding to at least one intermediate-pressure cylinder 300 to rotate. At this time, secondary reheat steam will be generated in each intermediate-pressure cylinder 300. It can be seen that the reheat steam generated by the boiler 200 may flow to all intermediate-pressure cylinders 300 or to some intermediate-pressure cylinders 300. Therefore, not all intermediate-pressure cylinders 300 need to work, which reduces the energy consumption of the turbine system 1000 and enables the turbine to maintain a high steam processing efficiency even under non-rated operating conditions.

[0045] Each pair of low-pressure cylinders 400 is connected to one intermediate-pressure cylinder 300. That is, each pair of low-pressure cylinders 400 and one intermediate-pressure cylinder 300 exist in pairs. If there are two intermediate-pressure cylinders 300, there are two pairs of low-pressure cylinders 400; if there is one intermediate-pressure cylinder 300, there is one pair of low-pressure cylinders 400. After secondary reheat steam is generated in each intermediate-pressure cylinder 300, the secondary reheat steam flows to the corresponding connected low-pressure cylinder 400 to drive the corresponding generator blades of the low-pressure cylinder 400 to rotate. When secondary reheat steam is generated in each intermediate-pressure cylinder 300, the secondary reheat steam cannot flow to a low-pressure cylinder 400 that is not connected to that intermediate-pressure cylinder 300, thus avoiding steam mixing between different cylinders.

[0046] In an exemplary embodiment, the process of setting the steam load capacity of the first high-pressure cylinder 110 and the steam load capacity of the second high-pressure cylinder 120 is related to the actual operating time of the turbine under the rated main steam flow rate at each preset ratio.

[0047] For example, if the actual operating time of the steam turbine at 40% of the rated main steam flow is one day, at 50% it is two days, and at 60% it is three days, then the target rated main steam flow with the longest actual operating time is selected as 60%. In this case, the steam load capacity of the first high-pressure cylinder 110 is set to match the target rated main steam flow, that is, the steam load capacity of the first high-pressure cylinder 110 is set to 60%. Since the steam load capacity of the first high-pressure cylinder 110 and the steam load capacity of the second high-pressure cylinder 120 need to meet the steam intake volume of the steam turbine under rated operating conditions, the steam load capacity of the second high-pressure cylinder 120 is set to 40% when the steam load capacity of the first high-pressure cylinder 110 is set to 60%. In other cases, the steam load capacity of the first high-pressure cylinder 110 and the steam load capacity of the second high-pressure cylinder 120 can also be set to 50%, etc.

[0048] Similarly, when at least one intermediate-pressure cylinder 300 includes two intermediate-pressure cylinders 300 and at least one pair of low-pressure cylinders 400 includes two pairs of low-pressure cylinders 400, the process of setting the steam load capacity between the two intermediate-pressure cylinders 300 is similar to the process of setting the steam load capacity of the first high-pressure cylinder 110 and the second high-pressure cylinder 120, and the process of setting the steam load capacity between the two pairs of low-pressure cylinders 400 is similar to the process of setting the steam load capacity of the first high-pressure cylinder 110 and the second high-pressure cylinder 120, and will not be repeated here.

[0049] In the aforementioned steam turbine system 1000, a first high-pressure cylinder 110 and a second high-pressure cylinder 120 are each connected to a boiler 200. The steam load capacity of the first high-pressure cylinder 110 is greater than that of the second high-pressure cylinder 120. At least one intermediate-pressure cylinder 300 is connected to the boiler 200. At least one pair of low-pressure cylinders 400 are connected to one intermediate-pressure cylinder 300. When the main steam flow rate of the steam turbine system 1000 exceeds a first preset main steam flow rate threshold, the main steam generated by the boiler 200 is preferentially directed to the first high-pressure cylinder 110, which has a larger steam load capacity, to drive the first high-pressure cylinder 110 to... The corresponding generator blades rotate until the first high-pressure cylinder 110 is filled, and then the remaining main steam flows to the second high-pressure cylinder 120 to drive the generator blades corresponding to the second high-pressure cylinder 120 to rotate. The secondary main steam flowing out of the first high-pressure cylinder 110 and the second high-pressure cylinder 120 flows back to the boiler 200. The boiler 200 heats the secondary main steam to generate reheat steam. The reheat steam flows to at least one intermediate-pressure cylinder 300 to drive the generator blades corresponding to at least one intermediate-pressure cylinder 300 to rotate. The secondary reheat steam generated in each intermediate-pressure cylinder 300 flows to a pair of low-pressure cylinders 400 connected to the intermediate-pressure cylinder 300 to drive the generator blades corresponding to the connected pair of low-pressure cylinders 400 to rotate. Throughout the process, by designing two high-pressure cylinders, at least one intermediate-pressure cylinder 300, and at least one pair of low-pressure cylinders 400 to replace one high-pressure cylinder, one intermediate-pressure cylinder 300, and one low-pressure cylinder 400 in the prior art, it is possible to reduce the power consumption of the turbine system 1000 without all pressure cylinders working or working simultaneously when the main steam flow of the turbine system 1000 is greater than the first preset main steam flow threshold. This allows the turbine to maintain a high steam processing efficiency even under non-rated operating conditions.

[0050] In one exemplary embodiment, the system further includes:

[0051] When the main steam flow rate of the steam turbine system 1000 is less than the first preset main steam flow rate threshold and greater than the second preset main steam flow rate threshold, the main steam generated by the boiler 200 flows to the first high-pressure cylinder 110 to drive the generator blades corresponding to the first high-pressure cylinder 110 to rotate. The secondary main steam flowing out of the first high-pressure cylinder 110 flows back to the boiler 200. The boiler 200 heats the secondary main steam to generate reheat steam. The reheat steam flows to at least one intermediate-pressure cylinder 300 to drive the generator blades corresponding to at least one intermediate-pressure cylinder 300 to rotate. The secondary reheat steam generated in each intermediate-pressure cylinder 300 flows to a pair of low-pressure cylinders 400 connected to the intermediate-pressure cylinder 300 to drive the generator blades corresponding to the connected pair of low-pressure cylinders 400 to rotate.

[0052] When the main steam flow rate of the steam turbine system 1000 is less than the second preset main steam flow rate threshold, the main steam generated by the boiler 200 flows to the second high-pressure cylinder 120 to drive the generator blades corresponding to the second high-pressure cylinder 120 to rotate. The secondary main steam flowing out of the second high-pressure cylinder 120 flows back to the boiler 200. The boiler 200 heats the secondary main steam to generate reheat steam. The reheat steam flows to at least one intermediate-pressure cylinder 300 to drive the generator blades corresponding to at least one intermediate-pressure cylinder 300 to rotate. The secondary reheat steam generated in each intermediate-pressure cylinder 300 flows to a pair of low-pressure cylinders 400 connected to the intermediate-pressure cylinder 300 to drive the generator blades corresponding to the connected pair of low-pressure cylinders 400 to rotate.

[0053] The first preset main steam flow rate threshold and the second preset main steam flow rate threshold are related to the steam load capacity of the first high-pressure cylinder 110 and the steam load capacity of the second high-pressure cylinder 120. For example, when the steam load capacity of the first high-pressure cylinder 110 is 60% and the steam load capacity of the second high-pressure cylinder 120 is 40%, the first preset main steam flow rate threshold can be 60% of the rated main steam flow rate and the second preset main steam flow rate threshold can be 40% of the rated main steam flow rate. As another example, when the steam load capacity of the first high-pressure cylinder 110 is 70% and the steam load capacity of the second high-pressure cylinder 120 is 30%, the first preset main steam flow rate threshold can be 70% of the rated main steam flow rate and the second preset main steam flow rate threshold can be 30% of the rated main steam flow rate.

[0054] Specifically, the steam turbine system can be classified into different operating conditions based on the main steam flow rate and the range between the first preset main steam flow rate threshold and the second preset main steam flow rate threshold:

[0055] In the first scenario, when the main steam flow rate of the steam turbine system 1000 equals the rated main steam flow rate, the first high-pressure cylinder 110 and the second high-pressure cylinder 120 need to operate simultaneously to meet the steam intake requirements of the steam turbine system 1000. At this time, the first high-pressure cylinder 110, the second high-pressure cylinder 120, at least one intermediate-pressure cylinder 300, and at least one pair of low-pressure cylinders 400 are all opened. The main steam generated by the boiler 200 flows to the first high-pressure cylinder 110 and the second high-pressure cylinder 120 to drive the first high-pressure cylinder 110 and the second high-pressure cylinder 120. When the generator blades corresponding to cylinder 120 rotate, the secondary main steam flowing out of the first high-pressure cylinder 110 and the second high-pressure cylinder 120 flows back to the boiler 200. The boiler 200 heats the secondary main steam to generate reheat steam, which flows to all intermediate-pressure cylinders 300 to drive the generator blades corresponding to all intermediate-pressure cylinders 300 to rotate. The secondary reheat steam generated in each intermediate-pressure cylinder 300 flows to a pair of low-pressure cylinders 400 connected to the intermediate-pressure cylinder 300 to drive the generator blades corresponding to the connected low-pressure cylinders 400 to rotate. It can be seen that at this time, the steam inlet priority between the two high-pressure cylinders is equal, and the steam inlet priority between at least one intermediate-pressure cylinder 300 is equal.

[0056] In some specific embodiments, when the main steam flow rate of the turbine system 1000 is equal to the rated main steam flow rate, the first high-pressure cylinder 110 can be opened first to direct the main steam generated by the boiler 200 to the first high-pressure cylinder 110 with a larger steam load, thereby driving the generator blades corresponding to the first high-pressure cylinder 110 to rotate until the first high-pressure cylinder 110 is full. Then, the second high-pressure cylinder 120 is opened to direct the remaining main steam to the second high-pressure cylinder 120, thereby driving the generator blades corresponding to the second high-pressure cylinder 120 to rotate until the second high-pressure cylinder 120 is full. The secondary main steam flowing out of the first high-pressure cylinder 110 and the second high-pressure cylinder 120 flows back to the boiler 200. The boiler 200 heats the secondary main steam to generate reheat steam. The reheat steam flows to at least one intermediate-pressure cylinder 300 to drive the generator blades corresponding to at least one intermediate-pressure cylinder 300 to rotate. The secondary reheat steam generated in each intermediate-pressure cylinder 300 flows to a pair of low-pressure cylinders 400 connected to the intermediate-pressure cylinder 300 to drive the generator blades corresponding to the connected pair of low-pressure cylinders 400 to rotate. At this time, the steam intake priority of the high-pressure cylinder with a larger steam load is higher than that of the high-pressure cylinder with a smaller steam load.

[0057] The second scenario involves the main steam flow rate of the steam turbine system 1000 being less than the rated operating condition but greater than the first preset main steam flow rate threshold. In this scenario, the main steam generated by the boiler 200 flows to the first high-pressure cylinder 110 to drive the corresponding generator blades of the first high-pressure cylinder 110 to rotate until the first high-pressure cylinder 110 is full. The remaining main steam then flows to the second high-pressure cylinder 120 to drive the corresponding generator blades of the second high-pressure cylinder 120 to rotate, while also meeting the minimum steam intake requirement of the second high-pressure cylinder 120. The secondary main steam flowing out of the first high-pressure cylinder 110 and the second high-pressure cylinder 120 flows back to the boiler 200. The boiler 200 heats the secondary main steam to generate reheat steam. The reheat steam flows to at least one intermediate-pressure cylinder 300 to drive the corresponding generator blades of at least one intermediate-pressure cylinder 300 to rotate. The secondary reheat steam generated in each intermediate-pressure cylinder 300 flows to a pair of low-pressure cylinders 400 connected to the intermediate-pressure cylinder 300 to drive the corresponding generator blades of the connected pair of low-pressure cylinders 400 to rotate.

[0058] Thirdly, when the main steam flow rate of the turbine system 1000 is less than the first preset main steam flow rate threshold but greater than the second preset main steam flow rate threshold, the steam load capacity of the second high-pressure cylinder 120 cannot meet the total main steam flow rate. However, the steam load capacity of the first high-pressure cylinder 110 can meet the main steam flow rate. Therefore, in order to reduce the power consumption of the turbine system 1000, the main steam generated by the boiler 200 can be directed to the first high-pressure cylinder 110 to drive the corresponding generator blades of the first high-pressure cylinder 110 to rotate. At this time, there is no remaining main steam that can flow into the second high-pressure cylinder 120, and the second high-pressure cylinder 120 does not need to work. The secondary main steam flowing out of the first high-pressure cylinder 110 flows back to the boiler 200. The boiler 200 heats the secondary main steam to generate reheat steam. The reheat steam flows to at least one intermediate-pressure cylinder 300 to drive the power generation blades corresponding to the at least one intermediate-pressure cylinder 300 to rotate. The secondary reheat steam generated in each intermediate-pressure cylinder 300 flows to a pair of low-pressure cylinders 400 connected to the intermediate-pressure cylinder 300 to drive the power generation blades corresponding to the pair of connected low-pressure cylinders 400 to rotate, thereby realizing multi-stage conversion between thermal energy and mechanical energy.

[0059] Fourthly, when the main steam flow rate of the turbine system 1000 is less than the second preset main steam flow rate threshold, the steam load capacity of both the first high-pressure cylinder 110 and the second high-pressure cylinder 120 can meet the steam inlet flow rate of the main steam flow. Therefore, in order to reduce the power consumption of the turbine system 1000, when the second high-pressure cylinder 120 with a lower steam load capacity can meet the steam inlet flow rate of the main steam flow, the first high-pressure cylinder 110 with a larger steam load capacity does not need to perform steam processing work. Therefore, the main steam generated by the boiler 200 can be directed to the second high-pressure cylinder 120 to drive the corresponding generator blades of the second high-pressure cylinder 120 to rotate. At this time, no main steam flows into the first high-pressure cylinder 110, and the first high-pressure cylinder 110 does not need to work. The secondary main steam flowing out of the second high-pressure cylinder 120 flows back to the boiler 200. The boiler 200 heats the secondary main steam to generate reheat steam. The reheat steam flows to at least one intermediate-pressure cylinder 300 to drive the power generation blades corresponding to the at least one intermediate-pressure cylinder 300 to rotate. The secondary reheat steam generated in each intermediate-pressure cylinder 300 flows to a pair of low-pressure cylinders 400 connected to the intermediate-pressure cylinder 300 to drive the power generation blades corresponding to the pair of connected low-pressure cylinders 400 to rotate, thereby realizing multi-stage conversion between thermal energy and mechanical energy.

[0060] For example, taking the steam load capacity of the first high-pressure cylinder 110 as 60%, the steam load capacity of the second high-pressure cylinder 120 as 40%, and the rated main steam flow rate with a first preset main steam flow rate threshold of 60% and a second preset main steam flow rate threshold of 40% as an example, specifically:

[0061] With the main steam flow rate of the steam turbine at the rated main steam flow rate, all cylinders are fully open to meet the steam inlet requirements of the steam turbine under rated operating conditions.

[0062] When the main steam flow rate of the steam turbine is between 60% and 100% of the rated main steam flow rate, the main steam preferentially enters the first high-pressure cylinder 110, which has a steam load capacity of 60%, and the remaining main steam enters the second high-pressure cylinder 120, which has a steam load capacity of 40%, while the minimum steam inlet flow rate of the second high-pressure cylinder 120 must be met. In addition, reheat steam will flow to at least one intermediate-pressure cylinder 300 and a low-pressure cylinder 400 connected to the intermediate-pressure cylinder 300 to which it flows.

[0063] When the main steam flow rate of the steam turbine is between 40% and 60% of the rated main steam flow rate, the second high-pressure cylinder 120 with a steam load capacity of 40% is closed, the main steam enters the first high-pressure cylinder 110 with a steam load capacity of 60%, and the reheat steam will flow to at least one intermediate-pressure cylinder 300 and the low-pressure cylinder 400 connected to the intermediate-pressure cylinder 300 to which it flows.

[0064] When the main steam flow rate of the steam turbine is below 40% of the rated main steam flow rate, the first high-pressure cylinder 110 with a steam load capacity of 60% is closed, the main steam enters the second high-pressure cylinder 120 with a steam load capacity of 40%, and the reheat steam will flow to at least one intermediate-pressure cylinder 300 and the low-pressure cylinder 400 connected to the intermediate-pressure cylinder 300 to which it flows.

[0065] In the above embodiments, by setting a first preset main steam flow rate threshold and a second preset main steam flow rate threshold, the steam treatment process of the high-pressure cylinder of the steam turbine is divided into four cases. In each case, accurate steam treatment can be achieved by combining the steam load capacity of each pressure cylinder.

[0066] In an exemplary embodiment, at least one intermediate-pressure cylinder 300 includes a first intermediate-pressure cylinder and a second intermediate-pressure cylinder; at least one pair of low-pressure cylinders 400 includes a first pair of low-pressure cylinders and a second pair of low-pressure cylinders; the turbine system 1000 further includes:

[0067] The first high-pressure regenerating device and the second high-pressure regenerating device are connected to both the first high-pressure cylinder 110 and the second high-pressure cylinder 120. The second high-pressure regenerating device is connected to both the first high-pressure cylinder 110 and the second high-pressure cylinder 120.

[0068] The first medium-pressure regenerative device and the second medium-pressure regenerative device are respectively connected to at least one medium-pressure cylinder 300 of the first medium-pressure cylinder and the second medium-pressure cylinder. The second medium-pressure regenerative device is respectively connected to at least one medium-pressure cylinder 300 of the first medium-pressure cylinder and the second medium-pressure cylinder.

[0069] The first low-pressure regenerative device, the second low-pressure regenerative device, the third low-pressure regenerative device, and the fourth low-pressure regenerative device are respectively connected to at least one pair of low-pressure cylinders 400 in the first pair of low-pressure cylinders and the second pair of low-pressure cylinders.

[0070] Among them, the regenerative heating equipment is an important device for improving the thermal efficiency of thermal power plants. It uses steam extracted from the steam turbine to heat the feedwater in boiler 200, thereby increasing the feedwater temperature, reducing heat loss in boiler 200, and improving the overall thermal efficiency of the power plant. The number of regenerative heating devices is equal to the number of corresponding steam pressure cylinders. For example, in the structure of the steam turbine, two high-pressure cylinders correspond to two high-pressure regenerative heating devices, two intermediate-pressure cylinders 300 correspond to two intermediate-pressure regenerative heating devices, and four low-pressure cylinders 400 should have four low-pressure regenerative heating devices. However, their connection relationship is not one steam pressure cylinder to one regenerative heating device.

[0071] Specifically, in the case where at least one intermediate-pressure cylinder 300 includes two parallel intermediate-pressure cylinders 300 and at least one pair of low-pressure cylinders 400 includes two parallel low-pressure cylinders 400, the two intermediate-pressure cylinders 300 include a first intermediate-pressure cylinder and a second intermediate-pressure cylinder, and the two pairs of low-pressure cylinders 400 include a first pair of low-pressure cylinders and a second pair of low-pressure cylinders. In practical applications, the steam inlet and outlet designs of the two parallel intermediate-pressure cylinders 300 are independent. Their number of stages and steam inlet and outlet pressures can be adjusted according to the corresponding low-pressure cylinders 400 as needed. The structure is that the cylinders have steam inlet in the middle and steam outlet at both ends, are coaxially arranged, and have a self-balancing thrust function. The intermediate-pressure cylinders 300 and low-pressure cylinders 400 generally adopt a single-shaft arrangement and are designed as a single generator. From the perspective of the generator unit classification, the intermediate-pressure cylinders 300 and low-pressure cylinders 400 constitute a single unit. The steam load capacity of the two parallel intermediate-pressure cylinders 300 can be adjusted according to the local load rate, for example: 4:6, 5.5:4.5, etc. The steam load capacity ratio between the two high-pressure cylinders, the steam load capacity ratio between the two intermediate-pressure cylinders 300, and the steam load capacity ratio between the two pairs of low-pressure cylinders 400 are all the same.

[0072] Each steam pressure cylinder may or may not be connected to a regenerative device. In this application, to improve the regenerative effect, a first high-pressure regenerative device and a second high-pressure regenerative device are provided for the two high-pressure cylinders. The first high-pressure cylinder 110 is connected to both the first and second high-pressure regenerative devices, and the second high-pressure cylinder 120 is connected to both the first and second high-pressure regenerative devices. A first medium-pressure regenerative device and a second medium-pressure regenerative device are provided for the two medium-pressure cylinders 300. The first medium-pressure regenerative device is connected to at least one of the first and second medium-pressure cylinders 300, and the second medium-pressure regenerative device is connected to at least one of the first and second medium-pressure cylinders 300. A first medium-pressure regenerative device and a second medium-pressure regenerative device are provided for the two pairs of low-pressure cylinders 400. The first, second, third, and fourth low-pressure regenerative devices are connected to at least one pair of the first and second pairs of low-pressure cylinders 400, respectively.

[0073] In other words, the medium-pressure regenerative equipment is not necessarily connected to all medium-pressure cylinders 300, and the low-pressure regenerative equipment is not necessarily connected to all low-pressure cylinders 400. This allows for the adaptive adoption of different steam treatment measures during subsequent processing to reduce the power consumption of the medium-pressure cylinders 300 and 400, thereby maintaining the efficiency of the medium-pressure cylinders 300 and 400 in steam treatment.

[0074] In the above embodiments, by setting up a first high-pressure regenerative device, a second high-pressure regenerative device, a first medium-pressure regenerative device, a second medium-pressure regenerative device, a first low-pressure regenerative device, a second low-pressure regenerative device, a third low-pressure regenerative device, and a fourth low-pressure regenerative device, the efficiency of the steam turbine in regenerating steam can be improved, thereby improving the power generation efficiency of the steam turbine.

[0075] In an exemplary embodiment, the first medium-pressure regenerative device is connected to both the first medium-pressure cylinder and the second medium-pressure cylinder, and the second medium-pressure regenerative device is connected to both the first medium-pressure cylinder and the second medium-pressure cylinder.

[0076] The first pair of low-pressure cylinders are connected to both the first and third low-pressure regenerating devices, and the second pair of low-pressure cylinders are connected to both the second and fourth low-pressure regenerating devices.

[0077] Specifically, the first intermediate-pressure cylinder is connected to both the first intermediate-pressure regenerating device and the second intermediate-pressure regenerating device, and the second intermediate-pressure cylinder is connected to both the first intermediate-pressure regenerating device and the second intermediate-pressure regenerating device.

[0078] The first pair of low-pressure cylinders are connected to the first, second, third, and fourth low-pressure regenerating devices, respectively. The second pair of low-pressure cylinders are also connected to the first, second, third, and fourth low-pressure regenerating devices, respectively.

[0079] In other words, each medium-pressure cylinder 300 is connected to all medium-pressure regenerative equipment, and each low-pressure cylinder 400 is connected to all low-pressure regenerative equipment, in order to improve the utilization rate of steam by the regenerative equipment.

[0080] In the above embodiments, by connecting each steam pressure cylinder to all corresponding regenerative devices and each low-pressure cylinder 400 to all low-pressure regenerative devices, the utilization rate of steam by the regenerative devices is improved.

[0081] In an exemplary embodiment, the first medium-pressure regenerative device is connected to both the first medium-pressure cylinder and the second medium-pressure cylinder, and the second medium-pressure regenerative device is connected to both the first medium-pressure cylinder and the second medium-pressure cylinder.

[0082] The first pair of low-pressure cylinders are connected to the first low-pressure regenerating device and the third low-pressure regenerating device, respectively. The second pair of low-pressure cylinders are connected to the second low-pressure regenerating device and the fourth low-pressure regenerating device, respectively.

[0083] Specifically, to reduce the workload of operators, this application also improves the connection relationship between the steam pressure cylinder and the regenerating equipment. Specifically, the connection relationship between the high-pressure cylinder and the high-pressure regenerating equipment remains unchanged, with the first high-pressure regenerating equipment connected to both the first high-pressure cylinder 110 and the second high-pressure cylinder 120, and the second high-pressure regenerating equipment connected to both the first high-pressure cylinder 110 and the second high-pressure cylinder 120. The connection relationship between the intermediate-pressure cylinder 300 and the intermediate-pressure regenerating equipment also remains unchanged, with the first intermediate-pressure regenerating equipment connected to both the first intermediate-pressure cylinder and the second intermediate-pressure cylinder, and the second intermediate-pressure regenerating equipment connected to both the first intermediate-pressure cylinder and the second intermediate-pressure cylinder. However, the connection relationship between the low-pressure cylinder 400 and the low-pressure regenerating equipment has been improved.

[0084] In the previous connection relationship between the low-pressure cylinder 400 and the low-pressure regenerating equipment, each medium-pressure cylinder 300 was connected to all the medium-pressure regenerating equipment, and each low-pressure cylinder 400 was connected to all the low-pressure regenerating equipment. In the improved connection relationship, the connection relationship between the low-pressure cylinder 400 and the low-pressure regenerating equipment was simplified. Specifically, the first pair of low-pressure cylinders was connected to both the first and third low-pressure regenerating equipment, and the second pair of low-pressure cylinders was connected to both the second and fourth low-pressure regenerating equipment.

[0085] At this point, each pair of low-pressure cylinders 400 does not need to be connected to all the low-pressure regeneration equipment, but only to a portion of it. This allows steam to be extracted from the first pair of low-pressure cylinders through the first and third low-pressure regeneration equipment, and steam to be extracted from the second pair of low-pressure cylinders through the second and fourth low-pressure regeneration equipment. The extracted steam can then be used for regeneration, which also reduces the workload of power plant staff.

[0086] For example, multiple low-pressure regenerative devices include low-pressure heater 550, low-pressure heater 560, low-pressure heater 570, and low-pressure heater 580. In this case, the first pair of low-pressure cylinders can be connected to low-pressure heater 550 and low-pressure heater 570, and the second pair of low-pressure cylinders can be connected to low-pressure heater 660 and low-pressure heater 580.

[0087] In the above embodiments, by setting the first pair of low-pressure cylinders to be connected to both the first and third low-pressure regenerating devices, and the second pair of low-pressure cylinders to be connected to both the second and fourth low-pressure regenerating devices, the connection relationship between the low-pressure cylinder 400 and the low-pressure regenerating devices is simplified, and the workload of power plant staff is reduced.

[0088] In an exemplary embodiment, the first intermediate pressure cylinder is connected to the first intermediate pressure cylinder, and the second intermediate pressure cylinder is connected to the second intermediate pressure cylinder, wherein the steam load capacity of the first intermediate pressure cylinder is greater than the steam load capacity of the second intermediate pressure cylinder, and the steam load capacity of the first pair of low pressure cylinders is greater than the steam load capacity of the second pair of low pressure cylinders.

[0089] When the main steam flow rate of the steam turbine system 1000 is greater than the first preset main steam flow rate threshold, the reheat steam flows to the first intermediate pressure cylinder to drive the corresponding generator blades of the first intermediate pressure cylinder to rotate. The secondary reheat steam generated in the first intermediate pressure cylinder flows to the first pair of low pressure cylinders to drive the corresponding generator blades of the first pair of low pressure cylinders to rotate. When the reheat steam fills the first intermediate pressure cylinder, the remaining reheat steam flows to the second intermediate pressure cylinder to drive the corresponding generator blades of the second intermediate pressure cylinder to rotate. The secondary reheat steam generated in the second intermediate pressure cylinder flows to the second pair of low pressure cylinders to drive the corresponding generator blades of the second pair of low pressure cylinders to rotate.

[0090] When the main steam flow rate of the steam turbine system 1000 is less than the first preset main steam flow rate threshold and greater than the second preset main steam flow rate threshold, the reheat steam flows to the first intermediate pressure cylinder to drive the corresponding generator blades of the first intermediate pressure cylinder to rotate. The secondary reheat steam generated in the first intermediate pressure cylinder flows to the first pair of low pressure cylinders to drive the corresponding generator blades of the first pair of low pressure cylinders to rotate.

[0091] When the main steam flow rate of the turbine system 1000 is less than the second preset main steam flow rate threshold, the reheat steam flows to the second intermediate pressure cylinder to drive the corresponding generator blades of the second intermediate pressure cylinder to rotate. The secondary reheat steam generated in the second intermediate pressure cylinder flows to the second pair of low pressure cylinders to drive the corresponding generator blades of the second pair of low pressure cylinders to rotate.

[0092] Specifically, the steam load capacity of the first intermediate-pressure cylinder is set to be greater than that of the second intermediate-pressure cylinder, and the steam load capacity of the first pair of low-pressure cylinders is set to be greater than that of the second pair of low-pressure cylinders. The process of setting the steam load capacity between the two intermediate-pressure cylinders 300 is similar to the process of setting the steam load capacity of the first high-pressure cylinder 110 and the second high-pressure cylinder 120. The process of setting the steam load capacity between the two pairs of low-pressure cylinders 400 is similar to the process of setting the steam load capacity of the first high-pressure cylinder 110 and the second high-pressure cylinder 120. These details will not be repeated here.

[0093] The interaction between reheat steam and intermediate-pressure cylinder 300 and low-pressure cylinder 400 is also related to the main steam flow rate of turbine system 1000, specifically including the following situations:

[0094] In the first scenario, when the main steam flow rate of the turbine system 1000 exceeds a first preset main steam flow rate threshold, the reheat steam preferentially flows to the first intermediate-pressure cylinder with a larger steam load capacity. This drives the corresponding generator blades of the first intermediate-pressure cylinder to rotate and generate secondary reheat steam. The first intermediate-pressure cylinder is connected to the first pair of low-pressure cylinders. Therefore, the secondary reheat steam flows to the first pair of low-pressure cylinders to drive the corresponding generator blades of the first pair of low-pressure cylinders to rotate. Simultaneously, after the reheat steam fills the first intermediate-pressure cylinder, the remaining reheat steam cannot enter the first intermediate-pressure cylinder but instead enters the second intermediate-pressure cylinder with a smaller steam load capacity. This drives the corresponding generator blades of the second intermediate-pressure cylinder to rotate. The second intermediate-pressure cylinder is connected to the second pair of low-pressure cylinders. The secondary reheat steam generated in the second intermediate-pressure cylinder flows to the second pair of low-pressure cylinders to drive the corresponding generator blades of the second pair of low-pressure cylinders to rotate.

[0095] In the second scenario, when the main steam flow rate of the turbine system 1000 is less than the first preset main steam flow rate threshold but greater than the second preset main steam flow rate threshold, the steam load capacity of the first intermediate pressure cylinder alone can meet the reheat steam inlet requirements, while the steam load capacity of the second intermediate pressure cylinder alone cannot meet the reheat steam inlet requirements. Therefore, the first intermediate pressure cylinder is in the open state, and the second intermediate pressure cylinder is in the closed state. The reheat steam flows to the first intermediate pressure cylinder to drive the corresponding generator blades of the first intermediate pressure cylinder to rotate. The secondary reheat steam generated in the first intermediate pressure cylinder flows to the first pair of low-pressure cylinders corresponding to the first intermediate pressure cylinder to drive the corresponding generator blades of the first pair of low-pressure cylinders to rotate.

[0096] Thirdly, when the main steam flow rate of the turbine system 1000 is less than the second preset main steam flow rate threshold, the steam load capacity of the first intermediate pressure cylinder and the steam load capacity of the second intermediate pressure cylinder can both meet the reheat steam inlet requirements. In order to reduce the power consumption of the turbine system 1000, the first intermediate pressure cylinder can be closed and the second intermediate pressure cylinder can be opened. The reheat steam flows to the second intermediate pressure cylinder to drive the corresponding generator blades of the second intermediate pressure cylinder to rotate. The secondary reheat steam generated in the second intermediate pressure cylinder flows to the second pair of low-pressure cylinders corresponding to the second intermediate pressure cylinder to drive the corresponding generator blades of the second pair of low-pressure cylinders to rotate.

[0097] Taking the steam load capacity of the first intermediate pressure cylinder as 60%, the steam load capacity of the second intermediate pressure cylinder as 40%, the steam load capacity of the first pair of low-pressure cylinders as 60%, the steam load capacity of the second pair of low-pressure cylinders as 40%, and the rated main steam flow rate with a first preset main steam flow rate threshold of 60% and a second preset main steam flow rate threshold of 40% as an example:

[0098] Specifically, when the main steam flow rate of the steam turbine is at the rated main steam flow rate, all cylinders are fully open to meet the steam inlet requirements of the steam turbine under rated operating conditions.

[0099] When the main steam flow rate of the steam turbine is between 60% and 100% of the rated main steam flow rate, the reheat steam preferentially enters the first intermediate-pressure cylinder with a steam load capacity of 60%, and the remaining reheat steam enters the second intermediate-pressure cylinder with a steam load capacity of 40%, while the minimum steam inlet flow rate of the second intermediate-pressure cylinder must be met. The secondary reheat steam generated in the first intermediate-pressure cylinder will flow to the first pair of low-pressure cylinders, and the secondary reheat steam generated in the second intermediate-pressure cylinder will flow to the second pair of low-pressure cylinders.

[0100] When the main steam flow rate of the steam turbine is between 40% and 60% of the rated main steam flow rate, the second intermediate pressure cylinder with a steam load capacity of 40% is closed, and the reheated steam enters the first intermediate pressure cylinder with a steam load capacity of 60%. The secondary reheated steam generated by the first intermediate pressure cylinder will flow to the first pair of low-pressure cylinders.

[0101] When the main steam flow rate of the steam turbine is below 40% of the rated main steam flow rate, the first intermediate pressure cylinder with a steam load capacity of 60% is closed, and the reheat steam enters the second intermediate pressure cylinder with a steam load capacity of 40%. The secondary reheat steam generated by the second intermediate pressure cylinder will flow to the second pair of low-pressure cylinders.

[0102] In the above embodiments, by setting a first preset main steam flow rate threshold and a second preset main steam flow rate threshold, the steam treatment process of the intermediate pressure cylinder 300 and the low pressure cylinder 400 of the steam turbine is divided into four cases. In each case, accurate steam treatment can be achieved by combining the steam load capacity of each pressure cylinder.

[0103] In an exemplary embodiment, the target medium-pressure cylinder in the first medium-pressure cylinder and the second medium-pressure cylinder are respectively connected to the first medium-pressure regenerating device and the second medium-pressure regenerating device, and the target low-pressure cylinder connected to the target medium-pressure cylinder is respectively connected to the first low-pressure regenerating device, the second low-pressure regenerating device, the third low-pressure regenerating device and the fourth low-pressure regenerating device.

[0104] The reheated steam flows to the target intermediate-pressure cylinder to drive the corresponding power generation blades of the target intermediate-pressure cylinder to rotate. The secondary reheated steam generated in the target intermediate-pressure cylinder flows to the target pair of low-pressure cylinders to drive the corresponding power generation blades of the first pair of low-pressure cylinders to rotate.

[0105] When the target intermediate-pressure cylinder is filled with reheated steam, the remaining reheated steam flows to the non-target intermediate-pressure cylinder to drive the generator blades corresponding to the non-target intermediate-pressure cylinder to rotate. The secondary reheated steam generated in the non-target intermediate-pressure cylinder flows to the non-target low-pressure cylinder connected to the non-target intermediate-pressure cylinder to drive the generator blades corresponding to the non-target low-pressure cylinder to rotate. The non-target intermediate-pressure cylinder is the intermediate-pressure cylinder 300 excluding the target intermediate-pressure cylinder, and the non-target low-pressure cylinder is the pair of low-pressure cylinders 400 excluding the target low-pressure cylinder.

[0106] Specifically, in addition to the connection relationships between the intermediate-pressure cylinder 300 and the intermediate-pressure regenerating device, and between the low-pressure cylinder 400 and the low-pressure regenerating device in the two embodiments described above, the connection relationships between the intermediate-pressure cylinder 300 and the intermediate-pressure regenerating device, and between the low-pressure cylinder 400 and the low-pressure regenerating device, can also be configured as follows:

[0107] The first and second medium-pressure regenerative devices are each connected to one of the two medium-pressure cylinders 300. The first, second, third, and fourth low-pressure regenerative devices are each connected to one of the two pairs of low-pressure cylinders 400.

[0108] Intermediate-pressure cylinders 300 connected to the first and second intermediate-pressure regenerators are designated as target intermediate-pressure cylinders, while intermediate-pressure cylinders 300 not connected to either are designated as non-target intermediate-pressure cylinders. The determination of the target intermediate-pressure cylinder is related to the actual operating time of the turbine at a preset ratio of rated main steam flow.

[0109] For example, if the actual operating time of the steam turbine at 40% of the rated main steam flow is relatively long, the steam load capacity of the second intermediate pressure cylinder can be set to 40%, and the steam load capacity of the first intermediate pressure cylinder can be set to 60%. In this case, the second intermediate pressure cylinder with a steam load capacity of 40% is used as the target intermediate pressure cylinder connected to all intermediate pressure regenerative equipment, and the first intermediate pressure cylinder is configured to extract steam into the corresponding regenerative equipment. Similarly, if the actual operating time of the steam turbine at 60% of the rated main steam flow is relatively long, the steam load capacity of the first intermediate pressure cylinder can be set to 60%, and the steam load capacity of the second intermediate pressure cylinder can be set to 40%. In this case, the first intermediate pressure cylinder with a steam load capacity of 60% is used as the target intermediate pressure cylinder connected to all intermediate pressure regenerative equipment, and the first intermediate pressure cylinder is configured to extract steam into the corresponding regenerative equipment.

[0110] Furthermore, since each pair of low-pressure cylinders 400 is matched with one medium-pressure cylinder 300, a pair of low-pressure cylinders 400 that are connected to the medium-pressure cylinders 300 that are connected to all medium-pressure regenerating equipment can be regarded as a pair of low-pressure cylinders 400 that are connected to all low-pressure regenerating equipment.

[0111] Under this connection, the process of handling reheat steam by the intermediate-pressure cylinder 300 and the low-pressure cylinder 400 will also change.

[0112] Specifically, the reheated steam flows to the target intermediate-pressure cylinder to drive the corresponding power generation blades of the target intermediate-pressure cylinder to rotate, without flowing to the non-target intermediate-pressure cylinder. The secondary reheated steam generated in the target intermediate-pressure cylinder flows to the target pair of low-pressure cylinders to drive the corresponding power generation blades of the first pair of low-pressure cylinders to rotate.

[0113] When the reheat steam does not fill the target intermediate pressure cylinder, the non-target intermediate pressure cylinder does not need to output power. Both the non-target intermediate pressure cylinder and the non-target low-pressure cylinder connected to the non-target intermediate pressure cylinder can be disconnected. At this time, since neither the non-target intermediate pressure cylinder nor the non-target low-pressure cylinder is connected to the reheat equipment, the disconnection process is simpler.

[0114] When the target intermediate-pressure cylinder is filled with reheated steam, the remaining reheated steam flows to the non-target intermediate-pressure cylinder. The non-target intermediate-pressure cylinder can then exert a small amount of force to drive the corresponding generator blades to rotate. The secondary reheated steam generated in the non-target intermediate-pressure cylinder flows to the non-target low-pressure cylinder connected to the non-target intermediate-pressure cylinder to drive the corresponding generator blades to rotate.

[0115] In the above embodiments, by setting the connection between the intermediate-pressure cylinder 300 and the intermediate-pressure regenerating equipment to one intermediate-pressure cylinder connected to all intermediate-pressure regenerating equipment and the other intermediate-pressure cylinder not connected to any intermediate-pressure regenerating equipment, and setting the connection between the low-pressure cylinder 400 and the low-pressure regenerating equipment to one pair of low-pressure cylinders connected to all low-pressure regenerating equipment and the other pair of low-pressure cylinders not connected to any low-pressure regenerating equipment, the efficiency of steam treatment can be improved.

[0116] In an exemplary embodiment, a first main steam regulating valve is provided between the first high-pressure cylinder 110 and the boiler 200, and a second main steam regulating valve is provided between the second high-pressure cylinder 120 and the boiler 200; when the first main steam regulating valve is opened, the main steam generated by the boiler 200 flows to the first high-pressure cylinder 110, and when the second main steam regulating valve is opened, the main steam generated by the boiler 200 flows to the second high-pressure cylinder 120.

[0117] A first reheat steam regulating valve is provided between the first intermediate pressure cylinder and the boiler 200, and a second reheat steam regulating valve is provided between the second intermediate pressure cylinder and the boiler 200. When the first reheat steam regulating valve is opened, the reheat steam generated by the boiler 200 flows to the first intermediate pressure cylinder, and when the second reheat steam regulating valve is opened, the reheat steam generated by the boiler 200 flows to the second intermediate pressure cylinder.

[0118] A primary reheat steam regulating valve is installed between the first pair of low-pressure cylinders and the first intermediate-pressure cylinder, and a secondary reheat steam regulating valve is installed between the second pair of low-pressure cylinders and the second intermediate-pressure cylinder. When the primary reheat steam regulating valve is opened, the secondary reheat steam generated by the first intermediate-pressure cylinder flows to the first pair of low-pressure cylinders. When the secondary reheat steam regulating valve is opened, the secondary reheat steam generated by the second intermediate-pressure cylinder flows to the second pair of low-pressure cylinders.

[0119] Specifically, the steam regulating valve can be in a closed state or an open state. When the steam regulating valve is in the open state, steam can enter the corresponding steam pressure cylinder. When the steam regulating valve is in the open state, steam cannot enter the corresponding steam pressure cylinder.

[0120] Therefore, in order to facilitate efficient steam processing by each stage of the steam pressure cylinders, a first main steam regulating valve can be installed between the first high-pressure cylinder 110 and the boiler 200, a second main steam regulating valve can be installed between the second high-pressure cylinder 120 and the boiler 200, a first reheat steam regulating valve can be installed between the first intermediate-pressure cylinder and the boiler 200, a second reheat steam regulating valve can be installed between the second intermediate-pressure cylinder and the boiler 200, a first-stage reheat steam regulating valve can be installed between the first pair of low-pressure cylinders and the first intermediate-pressure cylinder, and a second-stage reheat steam regulating valve can be installed between the second pair of low-pressure cylinders and the second intermediate-pressure cylinder.

[0121] First, the first main steam regulating valve is opened, and the main steam generated by the boiler 200 flows preferentially to the first high-pressure cylinder 110. When the first high-pressure cylinder 110 is full of main steam, the second main steam regulating valve is opened, and the remaining main steam flows to the second high-pressure cylinder 120.

[0122] Secondly, since the connection methods between different intermediate-pressure cylinders 300 and the intermediate-pressure regenerator are different, the opening status of the intermediate-pressure cylinders 300 is also different. Therefore, they will not be described in detail here. The common point is that when the reheat steam generated by the boiler 200 needs to flow to the first intermediate-pressure cylinder, the first reheat steam regulating valve needs to be opened; when the reheat steam needs to flow to the second intermediate-pressure cylinder, the second reheat steam regulating valve needs to be opened. Similarly, when the secondary reheat steam generated by the first intermediate-pressure cylinder needs to flow to the first pair of low-pressure cylinders, the first primary reheat steam regulating valve needs to be opened; when the secondary reheat steam generated by the second intermediate-pressure cylinder needs to flow to the second pair of low-pressure cylinders 400, the second secondary reheat steam regulating valve needs to be opened.

[0123] Furthermore, the opening and closing of each steam regulating valve is achieved through the control signal of the corresponding valve output by the host computer.

[0124] In the above embodiments, by setting steam regulating valves at multiple connection ports, it is easier to manage and regulate the entry and exit of steam, thereby improving the reliability of steam treatment by the steam turbine.

[0125] In one exemplary embodiment, the first high-pressure regenerative device and the second high-pressure regenerative device are both high-pressure heating devices, the first medium-pressure regenerative device is a high-pressure heating device, the second medium-pressure regenerative device is a deoxygenation device, and the first low-pressure regenerative device, the second low-pressure regenerative device, and the first low-pressure regenerative device and the second low-pressure regenerative device are all low-pressure heating devices.

[0126] Specifically, the turbine system 1000 of this application realizes the setting of the regenerative equipment through three high-pressure heating devices, four low-pressure heating devices and a deaerator.

[0127] In the turbine system 1000, the high-pressure heating equipment can be a high-pressure heater, which is a device that uses part of the steam extracted from the turbine to heat the feedwater.

[0128] Low-pressure heating equipment can be a low-pressure heater, which is an important auxiliary device in a steam turbine regenerative system. It extracts a certain amount of steam that has already done some work from the steam turbine to heat the main condensate. By using the steam that has already done some work in the turbine to heat the condensate, the low-pressure heater increases the condensate temperature, reduces the amount of steam discharged from the turbine to the condenser, thereby reducing energy loss and improving the cycle efficiency of the thermal system.

[0129] Deaeration equipment can be a deaerator, which is a mixing heater in the regenerative system of a steam turbine generator set. It uses intermediate extraction steam from the turbine to heat the boiler feedwater to its saturation temperature at the deaerator's operating pressure, thereby removing dissolved oxygen and other non-condensable gases from the feedwater. This prevents or slows down corrosion of the boiler, turbine, and their piping, extending their service life and ensuring the safe and economical operation of the power plant. Deaerators typically operate at high pressures and temperatures to ensure that dissolved oxygen in the feedwater is adequately removed.

[0130] Therefore, the steam turbine system 1000 uses high-pressure heating equipment, deaerator equipment, and low-pressure heating equipment to work together to recover and reuse steam, thereby improving the unit's thermal efficiency and economic benefits.

[0131] In the above embodiments, by setting the first high-pressure regenerative device and the second high-pressure regenerative device to be high-pressure heating devices, the first medium-pressure regenerative device to be a high-pressure heating device, the second medium-pressure regenerative device to be a deaerator, and the first low-pressure regenerative device, the second low-pressure regenerative device, and the first low-pressure regenerative device and the second low-pressure regenerative device to be low-pressure heating devices, reliable recovery and utilization of secondary steam generated by each stage of steam pressure cylinders is achieved, improving the thermal efficiency and economic benefits of the unit and ensuring the safe and stable operation of the power plant.

[0132] In one exemplary embodiment, such as Figure 2 As shown, the first pair of low-pressure cylinders 410 includes a first low-pressure cylinder 412 and a second low-pressure cylinder 414, and the second pair of low-pressure cylinders 420 includes a third low-pressure cylinder 412 and a fourth low-pressure cylinder 414; the first low-pressure cylinder 412, the second low-pressure cylinder 414, the third low-pressure cylinder 412 and the fourth low-pressure cylinder 414 are all equipped with rotors.

[0133] The rotors of the first high-pressure cylinder 110 and the second high-pressure cylinder 120 are connected by bearings. The rotors of the second high-pressure cylinder 120 and the first intermediate-pressure cylinder 310 are connected by bearings. The rotors of the first intermediate-pressure cylinder 310 and the second intermediate-pressure cylinder 320 are connected by bearings. The rotors of the second intermediate-pressure cylinder 320 and the first low-pressure cylinder 412 are connected by bearings. The rotors of the first low-pressure cylinder 412 and the second low-pressure cylinder 414 are connected by bearings. The rotors of the second low-pressure cylinder 414 and the third low-pressure cylinder 422 are connected by bearings. The rotors of the third low-pressure cylinder 422 and the fourth low-pressure cylinder 424 are connected by bearings.

[0134] Specifically, the turbine rotor is the rotating component in a steam turbine that converts the thermal energy of steam into mechanical energy. It consists of rotating parts such as the main shaft, impeller (or drum), moving blades, and coupling. The steam acts on the rotor blades, generating a driving force that rotates the rotor, thereby outputting mechanical work.

[0135] Each steam pressure cylinder is equipped with a rotor to convert the thermal energy of steam into mechanical energy. The rotors of each steam pressure cylinder are connected by bearings to achieve power transmission. Specifically, as follows... Figure 2 As shown, the rotors of the first high-pressure cylinder 110 and the second high-pressure cylinder 120 are connected by bearings; the rotors of the second high-pressure cylinder 120 and the first intermediate-pressure cylinder 310 are connected by bearings; the rotors of the first intermediate-pressure cylinder 310 and the second intermediate-pressure cylinder 320 are connected by bearings; the rotors of the second intermediate-pressure cylinder 320 and the first low-pressure cylinder 412 are connected by bearings; the rotors of the first low-pressure cylinder 412 and the second low-pressure cylinder 414 are connected by bearings; the rotors of the second low-pressure cylinder 414 and the third low-pressure cylinder 422 are connected by bearings; and the rotors of the third low-pressure cylinder 422 and the fourth low-pressure cylinder 424 are connected by bearings. The bearings are... Figure 2 The line segment without an arrowhead.

[0136] In the above embodiments, energy conversion in the steam turbine is achieved by setting a rotor, and the bearings of the rotor realize the power transmission in each stage of the steam pressure cylinder, thereby improving the reliability of the steam turbine system 1000 in performing work.

[0137] In an exemplary embodiment, the turbine system further includes a condenser connected to the first low-pressure cylinder and the third regenerative equipment. The condenser directs condensate into the third regenerative equipment, mixing the steam flowing from multiple cylinders into the third regenerative equipment to form first mixed-temperature water. This first mixed-temperature water then flows into a second regenerative equipment, where it heats the steam discharged from the intermediate-pressure cylinder to form second mixed-temperature water. This second mixed-temperature water then flows into the first regenerative equipment, where it heats the steam discharged from the high-pressure cylinder to form reheat water, which is then returned to the boiler.

[0138] In one exemplary embodiment, the turbine system is further provided with a generator connected to a low-pressure cylinder, which converts the reheat steam flowing into the low-pressure cylinder into thermoelectric power through the generator.

[0139] In an exemplary embodiment, a steam turbine system 1000 will be described in detail below. The steam turbine system 1000 is used to process steam generated by a boiler 200. The steam turbine includes a first high-pressure cylinder 110, a second high-pressure cylinder 120, a first intermediate-pressure cylinder 310, a second intermediate-pressure cylinder 320, a first pair of low-pressure cylinders 410, and a second pair of low-pressure cylinders 420. The first pair of low-pressure cylinders 410 includes a first low-pressure cylinder 412 and a second low-pressure cylinder 414, and the second pair of low-pressure cylinders 420 includes a third low-pressure cylinder 422 and a fourth low-pressure cylinder 424. Furthermore, the steam turbine system 1000 also includes multiple regenerative devices, including a No. 1 high-pressure heater 510, a No. 2 high-pressure heater 520, a No. 3 high-pressure heater 530, a No. 4 deaerator 540, a No. 5 low-pressure heater 550, a No. 6 low-pressure heater 560, a No. 7 low-pressure heater 570, and a No. 8 low-pressure heater 580.

[0140] Each high-pressure cylinder is connected to the boiler 200, each medium-pressure cylinder 300 is connected to the boiler 200, the first medium-pressure cylinder 310 is connected to the first pair of low-pressure cylinders 410, and the second medium-pressure cylinder 320 is connected to the second pair of low-pressure cylinders 420.

[0141] Among them, the actual operating time of the turbine is the longest when it is operating at 60% of the rated main steam flow. Therefore, the steam load capacity of the first high-pressure cylinder 110 is set to 60%, and the steam load capacity of the second high-pressure cylinder 120 is set to 40%. Similarly, the steam load capacity of the first intermediate-pressure cylinder 310 is set to 60%, and the steam load capacity of the second intermediate-pressure cylinder 320 is set to 40%. The steam load capacity of the first pair of low-pressure cylinders 410 is set to 60%, and the steam load capacity of the second pair of low-pressure cylinders 420 is set to 40%.

[0142] The first high-pressure cylinder 110 is connected to both the first high-pressure heater 510 and the second high-pressure heater 520, and the second high-pressure cylinder 120 is connected to both the third high-pressure heater 530 and the fourth high-pressure heater.

[0143] The connection relationships between the intermediate pressure cylinder 300 and the No. 3 high pressure heater 530 and the No. 4 deaerator 540, and between the low pressure cylinder 400 and the No. 5 low pressure heater 550, the No. 6 low pressure heater 560, the No. 7 low pressure heater 570 and the No. 8 low pressure heater 580, can include the following three types:

[0144] The first type, such as Figure 3 As shown, the first intermediate-pressure cylinder 310 is connected to both the No. 3 high-pressure heater 530 and the No. 4 deaerator 540, respectively. The second intermediate-pressure cylinder 320 is connected to both the No. 3 high-pressure heater 530 and the No. 4 deaerator 540, respectively. The first pair of low-pressure cylinders 410 are connected to the No. 5 low-pressure heater 550, the No. 6 low-pressure heater 560, the No. 7 low-pressure heater 570 and the No. 8 low-pressure heater 580, respectively. The second pair of low-pressure cylinders 420 are connected to the No. 5 low-pressure heater 550, the No. 6 low-pressure heater 560, the No. 7 low-pressure heater 570 and the No. 8 low-pressure heater 580, respectively.

[0145] The second type, such as Figure 4 As shown, the first intermediate-pressure cylinder 310 is connected to the No. 3 high-pressure heater 530 and the No. 4 deaerator 540 respectively; the second intermediate-pressure cylinder 320 is connected to the No. 3 high-pressure heater 530 and the No. 4 deaerator 540 respectively; the first pair of low-pressure cylinders 410 are connected to the No. 5 low-pressure heater 550 and the No. 7 low-pressure heater 570 respectively; and the second pair of low-pressure cylinders 420 are connected to the No. 6 low-pressure heater 560 and the No. 8 low-pressure heater 580 respectively.

[0146] The third type, such as Figure 5 As shown, the first intermediate-pressure cylinder 310 is connected to both the No. 3 high-pressure heater 530 and the No. 4 deaerator 540. The first pair of low-pressure cylinders 410 are connected to the No. 5 low-pressure heater 550, the No. 6 low-pressure heater 560, the No. 7 low-pressure heater 570 and the No. 8 low-pressure heater 580. The second intermediate-pressure cylinder 320 is not connected to the No. 3 high-pressure heater 530 and the No. 4 deaerator 540. The second pair of cylinders is not connected to the No. 5 low-pressure heater 550, the No. 6 low-pressure heater 560, the No. 7 low-pressure heater 570 and the No. 8 low-pressure heater 580.

[0147] The steam processing procedures of the turbine system 1000 differ depending on the three connection relationships described above, and can be categorized as follows:

[0148] Regarding the first and second connection relationships mentioned above, since the connection between the regenerator and each stage of the steam pressure cylinders has been simplified, each stage of the steam pressure cylinders remains connected to the regenerator, and the steam in each stage of the steam pressure cylinders can still be extracted to the corresponding connected regenerator. Therefore, the steam treatment process of the steam turbine system 1000 includes:

[0149] When the main steam flow rate of the turbine system is equal to the rated main steam flow rate, all valves corresponding to the cylinders are fully open to meet the turbine steam inlet requirements under the rated main steam flow rate.

[0150] When the main steam flow rate of the steam turbine system 1000 is between 60% and 100% of the rated main steam flow rate, the main steam preferentially enters the first high-pressure cylinder 110 to drive the corresponding generator blades of the first high-pressure cylinder 110 to rotate. The remaining steam enters the second high-pressure cylinder 120 to drive the corresponding generator blades of the second high-pressure cylinder 120 to rotate, while simultaneously satisfying the minimum steam intake of the second high-pressure cylinder 120. The secondary main steam flowing out of the first high-pressure cylinder 110 and the second high-pressure cylinder 120 flows back to the boiler 200. The boiler 200 heats the secondary main steam to generate reheat steam, which preferentially enters the second high-pressure cylinder 1000 to generate reheat steam. A first intermediate-pressure cylinder 310 drives the corresponding generator blades of the first intermediate-pressure cylinder 310 to rotate. The remaining steam enters the second intermediate-pressure cylinder 320 to drive the corresponding generator blades of the second intermediate-pressure cylinder 320 to rotate. At the same time, the minimum steam intake of the second intermediate-pressure cylinder 320 is satisfied. The secondary reheat steam generated by the first intermediate-pressure cylinder 310 can also flow to the first pair of low-pressure cylinders 410 to drive the corresponding generator blades of the first pair of low-pressure cylinders 410 to rotate. The secondary reheat steam generated by the second intermediate-pressure cylinder 320 can also flow to the second pair of low-pressure cylinders 420 to drive the corresponding generator blades of the second pair of low-pressure cylinders 420 to rotate.

[0151] When the main steam flow rate of the steam turbine system 1000 is between 40% and 60% of the rated main steam flow rate, the second high-pressure cylinder 120, the second intermediate-pressure cylinder 320, and the second pair of low-pressure cylinders 420 are closed. The main steam enters the first high-pressure cylinder 110 to drive the generator blades corresponding to the first high-pressure cylinder 110 to rotate. The secondary main steam flowing out of the first high-pressure cylinder 110 flows back to the boiler 200. The boiler 200 heats the secondary main steam to generate reheat steam. The reheat steam enters the first intermediate-pressure cylinder 310 to drive the generator blades corresponding to the first intermediate-pressure cylinder 310 to rotate. The secondary reheat steam generated by the first intermediate-pressure cylinder 310 can also flow to the first pair of low-pressure cylinders 410 to drive the generator blades corresponding to the first pair of low-pressure cylinders 410 to rotate.

[0152] When the main steam flow rate of the steam turbine system 1000 is below 40% of the rated main steam flow rate, the first high-pressure cylinder 110, the first intermediate-pressure cylinder 310, and the first pair of low-pressure cylinders 410 are shut down. The main steam enters the second high-pressure cylinder 120 to drive the generator blades corresponding to the second high-pressure cylinder 120 to rotate. The secondary main steam flowing out of the second high-pressure cylinder 120 flows back to the boiler 200. The boiler 200 heats the secondary main steam to generate reheat steam. The reheat steam enters the second intermediate-pressure cylinder 320 to drive the generator blades corresponding to the second intermediate-pressure cylinder 320 to rotate. The secondary reheat steam generated by the second intermediate-pressure cylinder 320 can also flow to the second pair of low-pressure cylinders 420 to drive the generator blades corresponding to the second pair of low-pressure cylinders 420 to rotate.

[0153] Regarding the third type of connection mentioned above, some steam pressure cylinders are not connected to the regenerative equipment. Therefore, during the steam processing of the steam turbine system 1000, the steam will flow to the steam pressure cylinders equipped with regenerative equipment, namely, to the first intermediate-pressure cylinder 310 and the first pair of low-pressure cylinders 410. At this time, the first intermediate-pressure cylinder 310 and the first pair of low-pressure cylinders 410 will continue to operate, while steam pressure cylinders without regenerative equipment, such as the second intermediate-pressure cylinder 320 and the second pair of low-pressure cylinders 420, will be disconnected or operate at low power. The secondary steam generated in the steam pressure cylinders will be extracted and sent to the corresponding regenerative equipment.

[0154] The above system has the following specific advantages:

[0155] 1. This application improves energy utilization. This application designs a wide-load, high-efficiency steam turbine system 1000, which can match the steam inlet flow rate, improves the turbine efficiency, and thus improves the energy utilization of steam.

[0156] 2. This application has the advantage of energy saving. This application can improve the efficiency of steam turbines, thereby reducing the coal consumption of the unit and achieving energy-saving effects.

[0157] 3. This application has the advantage of carbon reduction. By improving energy utilization and reducing unit coal consumption, this application reduces carbon consumption and carbon dioxide emissions, which helps to achieve the dual carbon targets.

[0158] 4. This application provides technical support for the construction of a new generation of coal-fired power and new power systems.

[0159] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0160] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0161] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0162] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A steam turbine system, characterized in that, The steam turbine system includes: The first high-pressure cylinder and the second high-pressure cylinder are connected to the boiler respectively. The steam load capacity of the first high-pressure cylinder is greater than that of the second high-pressure cylinder. At least one intermediate-pressure cylinder, which is connected to the boiler; At least one pair of low-pressure cylinders, each pair of said low-pressure cylinders being connected to one of said medium-pressure cylinders; When the main steam flow rate of the turbine system is greater than a first preset main steam flow rate threshold, the main steam generated by the boiler flows to the first high-pressure cylinder to drive the generator blades corresponding to the first high-pressure cylinder to rotate until the first high-pressure cylinder is filled. The remaining main steam flows to the second high-pressure cylinder to drive the generator blades corresponding to the second high-pressure cylinder to rotate. The secondary main steam flowing out of the first high-pressure cylinder and the second high-pressure cylinder flows back to the boiler. The boiler heats the secondary main steam to generate reheat steam. The reheat steam flows to the at least one intermediate-pressure cylinder to drive the generator blades corresponding to the at least one intermediate-pressure cylinder to rotate. The secondary reheat steam generated in each intermediate-pressure cylinder flows to a pair of low-pressure cylinders connected to the intermediate-pressure cylinder to drive the generator blades corresponding to the connected pair of low-pressure cylinders to rotate.

2. The system according to claim 1, characterized in that, The system also includes: When the main steam flow rate of the steam turbine system is less than the first preset main steam flow rate threshold and greater than the second preset main steam flow rate threshold, the main steam generated by the boiler flows to the first high-pressure cylinder to drive the generator blades corresponding to the first high-pressure cylinder to rotate. The secondary main steam flowing out of the first high-pressure cylinder flows back to the boiler. The boiler heats the secondary main steam to generate reheat steam. The reheat steam flows to the at least one intermediate-pressure cylinder to drive the generator blades corresponding to the at least one intermediate-pressure cylinder to rotate. The secondary reheat steam generated in each intermediate-pressure cylinder flows to a pair of low-pressure cylinders connected to the intermediate-pressure cylinder to drive the generator blades corresponding to the connected pair of low-pressure cylinders to rotate. When the main steam flow rate of the turbine system is less than the second preset main steam flow rate threshold, the main steam generated by the boiler flows to the second high-pressure cylinder to drive the generator blades corresponding to the second high-pressure cylinder to rotate. The secondary main steam flowing out of the second high-pressure cylinder flows back to the boiler. The boiler heats the secondary main steam to generate reheat steam. The reheat steam flows to the at least one intermediate-pressure cylinder to drive the generator blades corresponding to the at least one intermediate-pressure cylinder to rotate. The secondary reheat steam generated in each intermediate-pressure cylinder flows to a pair of low-pressure cylinders connected to the intermediate-pressure cylinder to drive the generator blades corresponding to the connected pair of low-pressure cylinders to rotate.

3. The system according to claim 1, characterized in that, The at least one intermediate-pressure cylinder includes a first intermediate-pressure cylinder and a second intermediate-pressure cylinder; the at least one pair of low-pressure cylinders includes a first pair of low-pressure cylinders and a second pair of low-pressure cylinders; the turbine system further includes: A first high-pressure regenerating device and a second high-pressure regenerating device, wherein the first high-pressure regenerating device is connected to both the first high-pressure cylinder and the second high-pressure cylinder, and the second high-pressure regenerating device is connected to both the first high-pressure cylinder and the second high-pressure cylinder; The first medium-pressure regenerative device and the second medium-pressure regenerative device are respectively connected to at least one of the first medium-pressure cylinder and the second medium-pressure cylinder, and the second medium-pressure regenerative device is respectively connected to at least one of the first medium-pressure cylinder and the second medium-pressure cylinder. The first low-pressure regenerative device, the second low-pressure regenerative device, the third low-pressure regenerative device, and the fourth low-pressure regenerative device are respectively connected to at least one pair of low-pressure cylinders in the first pair of low-pressure cylinders and the second pair of low-pressure cylinders.

4. The system according to claim 3, characterized in that, The first medium-pressure regenerative device is connected to both the first medium-pressure cylinder and the second medium-pressure cylinder, and the second medium-pressure regenerative device is connected to both the first medium-pressure cylinder and the second medium-pressure cylinder. The first low-pressure regenerative device, the second low-pressure regenerative device, the third low-pressure regenerative device, and the fourth low-pressure regenerative device are all connected to the first pair of low-pressure cylinders and the second pair of low-pressure cylinders, respectively.

5. The system according to claim 3, characterized in that, The first medium-pressure regenerative device is connected to both the first medium-pressure cylinder and the second medium-pressure cylinder, and the second medium-pressure regenerative device is connected to both the first medium-pressure cylinder and the second medium-pressure cylinder. The first pair of low-pressure cylinders are connected to both the first low-pressure regenerating device and the third low-pressure regenerating device, and the second pair of low-pressure cylinders are connected to both the second low-pressure regenerating device and the fourth low-pressure regenerating device.

6. The system according to any one of claims 4-5, characterized in that, The first intermediate pressure cylinder is connected to the first intermediate pressure cylinder, and the second intermediate pressure cylinder is connected to the second intermediate pressure cylinder. The steam load capacity of the first intermediate pressure cylinder is greater than that of the second intermediate pressure cylinder, and the steam load capacity of the first pair of low pressure cylinders is greater than that of the second pair of low pressure cylinders. When the main steam flow rate of the turbine system is greater than the first preset main steam flow rate threshold, the reheat steam flows to the first intermediate pressure cylinder to drive the corresponding generator blades of the first intermediate pressure cylinder to rotate. The secondary reheat steam generated in the first intermediate pressure cylinder flows to the first pair of low-pressure cylinders to drive the corresponding generator blades of the first pair of low-pressure cylinders to rotate. When the reheat steam fills the first intermediate pressure cylinder, the remaining reheat steam flows to the second intermediate pressure cylinder to drive the corresponding generator blades of the second intermediate pressure cylinder to rotate. The secondary reheat steam generated in the second intermediate pressure cylinder flows to the second pair of low-pressure cylinders to drive the corresponding generator blades of the second pair of low-pressure cylinders to rotate. When the main steam flow rate of the turbine system is less than the first preset main steam flow rate threshold and greater than the second preset main steam flow rate threshold, the reheat steam flows to the first intermediate pressure cylinder to drive the corresponding power generation blades of the first intermediate pressure cylinder to rotate, and the secondary reheat steam generated in the first intermediate pressure cylinder flows to the first pair of low pressure cylinders to drive the corresponding power generation blades of the first pair of low pressure cylinders to rotate. When the main steam flow rate of the turbine system is less than the second preset main steam flow rate threshold, the reheat steam flows to the second intermediate pressure cylinder to drive the generator blades corresponding to the second intermediate pressure cylinder to rotate. The secondary reheat steam generated in the second intermediate pressure cylinder flows to the second pair of low pressure cylinders to drive the generator blades corresponding to the second pair of low pressure cylinders to rotate.

7. The system according to claim 3, characterized in that, The target medium-pressure cylinder in the first medium-pressure cylinder and the second medium-pressure cylinder are respectively connected to the first medium-pressure regenerating device and the second medium-pressure regenerating device. The target low-pressure cylinder connected to the target medium-pressure cylinder is respectively connected to the first low-pressure regenerating device, the second low-pressure regenerating device, the third low-pressure regenerating device and the fourth low-pressure regenerating device. The reheated steam flows to the target intermediate-pressure cylinder to drive the power generation blades corresponding to the target intermediate-pressure cylinder to rotate, and the secondary reheated steam generated in the target intermediate-pressure cylinder flows to the target pair of low-pressure cylinders to drive the power generation blades corresponding to the first pair of low-pressure cylinders to rotate. When the reheated steam fills the target intermediate-pressure cylinder, the remaining reheated steam flows to the non-target intermediate-pressure cylinder to drive the generator blades corresponding to the non-target intermediate-pressure cylinder to rotate. The secondary reheated steam generated in the non-target intermediate-pressure cylinder flows to the non-target low-pressure cylinder connected to the non-target intermediate-pressure cylinder to drive the generator blades corresponding to the non-target low-pressure cylinder to rotate. The non-target intermediate-pressure cylinder is an intermediate-pressure cylinder other than the target intermediate-pressure cylinder, and the non-target low-pressure cylinder is a pair of low-pressure cylinders other than the target low-pressure cylinder.

8. The system according to claim 3, characterized in that, A first main steam regulating valve is provided between the first high-pressure cylinder and the boiler, and a second main steam regulating valve is provided between the second high-pressure cylinder and the boiler; when the first main steam regulating valve is opened, the main steam generated by the boiler flows to the first high-pressure cylinder, and when the second main steam regulating valve is opened, the main steam generated by the boiler flows to the second high-pressure cylinder; A first reheat steam regulating valve is provided between the first intermediate pressure cylinder and the boiler, and a second reheat steam regulating valve is provided between the second intermediate pressure cylinder and the boiler; when the first reheat steam regulating valve is opened, the reheat steam generated by the boiler flows to the first intermediate pressure cylinder, and when the second reheat steam regulating valve is opened, the reheat steam generated by the boiler flows to the second intermediate pressure cylinder; A first-stage reheat steam regulating valve is provided between the first pair of low-pressure cylinders and the first intermediate-pressure cylinder, and a second-stage reheat steam regulating valve is provided between the second pair of low-pressure cylinders and the second intermediate-pressure cylinder. When the first-stage reheat steam regulating valve is opened, the secondary reheat steam generated by the first intermediate-pressure cylinder flows to the first pair of low-pressure cylinders, and when the second-stage reheat steam regulating valve is opened, the secondary reheat steam generated by the second intermediate-pressure cylinder flows to the second pair of low-pressure cylinders.

9. The system according to claim 3, characterized in that, Both the first high-pressure regenerative device and the second high-pressure regenerative device are high-pressure heating devices, the first medium-pressure regenerative device is a high-pressure heating device, the second medium-pressure regenerative device is a deoxygenation device, and the first low-pressure regenerative device, the second low-pressure regenerative device, and the first low-pressure regenerative device and the second low-pressure regenerative device are all low-pressure heating devices.

10. The system according to claim 3, characterized in that, The first pair of low-pressure cylinders includes a first low-pressure cylinder and a second low-pressure cylinder, and the second pair of low-pressure cylinders includes a third low-pressure cylinder and a fourth low-pressure cylinder; the first low-pressure cylinder, the second low-pressure cylinder, the third low-pressure cylinder and the fourth low-pressure cylinder are all equipped with rotors; The rotors of the first high-pressure cylinder and the second high-pressure cylinder are connected by bearings. The rotors of the second high-pressure cylinder and the first intermediate-pressure cylinder are connected by bearings. The rotors of the first intermediate-pressure cylinder and the second intermediate-pressure cylinder are connected by bearings. The rotors of the second intermediate-pressure cylinder and the first low-pressure cylinder are connected by bearings. The rotors of the first low-pressure cylinder and the second low-pressure cylinder are connected by bearings. The rotors of the second low-pressure cylinder and the third low-pressure cylinder are connected by bearings. The rotors of the third low-pressure cylinder and the fourth low-pressure cylinder are connected by bearings.

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