High-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine

Abstract

The present invention relates to the technical field of steam turbines, and in particular to a high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine, comprising a reheater, a front cylinder, an exhaust cylinder and a rotor, wherein high-pressure, medium- and low-pressure flow parts are arranged in sequence from front to back between the front cylinder and the rotor, and main steam enters the steam inlet of the high-pressure flow part through a high-pressure main steam regulating combined valve, and a steam extraction port is provided at the steam outlet of the high-pressure flow part, and the steam extraction port is connected to the inlet of the reheater, and the outlet of the reheater is connected to the steam inlet of the medium- and low-pressure flow part through a reheat steam regulating combined valve; the front cylinder is a segmented combined structure, comprising a steam seal section, a front transition section, a main valve section, a rear transition section and a vertical flange section arranged in sequence from front to back and connected to each other, and a flange cat claw section connecting each section, a main steam valve connection port is provided on the main valve section, and a reheat steam valve connection port is provided on one end of the rear transition section close to the main valve section, and the vertical flange section is connected to the exhaust cylinder. The manufacturing cycle is short and the cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines, and in particular to a high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine. Background Art

[0002] In recent years, domestic steel production capacity has been seriously oversupplied. In order to gain further survival space, major steel mills have actively implemented technological innovation, continuously adjusted and improved production processes, reduced process unit consumption, in order to reduce product costs and enhance product market competitiveness. Among them, the recycling of waste heat and waste energy generated by steel mill production is the most direct cost-reduction and gain-increasing measure for steel mills in recent years, especially the installation of high-efficiency energy-saving generator sets. Fully and efficiently utilizing the abundant coal gas produced by steel mills is a very intuitive and rapid cost-reduction and gain-increasing measure. The full and efficient use of abundant coal gas can not only reduce costs and increase efficiency, but also reduce waste gas emissions and achieve the purpose of environmentally friendly production.

[0003] Since the generator set of the steel plant has been in normal operation for a long time, the abundant gas produced by the plant has not been used efficiently. Therefore, such projects have strict requirements on the construction period of the generator set. How to shorten the equipment manufacturing cycle and thus shorten the project construction cycle is a difficult problem that every equipment manufacturer has to face for the steel plant generator set. A shorter manufacturing cycle can produce direct economic benefits.

[0004] For waste heat power generation steam turbines, energy saving, high efficiency and rationality are the design benchmarks. For a long time, waste heat utilization units in service in China generally have obvious disadvantages such as low efficiency, short overhaul cycle, complex unit operation and maintenance. Moreover, most units with larger power have problems such as "double cylinder layout, large axial installation space, and high production and maintenance costs". Summary of the invention

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine with a short manufacturing cycle and low manufacturing cost.

[0006] In order to solve the above technical problems, the present invention adopts the following technical scheme: a high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine, comprising a reheater, a front cylinder, an exhaust cylinder connected to the rear end of the front cylinder, and a rotor inserted in the front cylinder and the exhaust cylinder, a high-pressure flow part and a medium-low pressure flow part are arranged in sequence from front to back between the front cylinder and the rotor, the main steam enters the steam inlet of the high-pressure flow part through the high-pressure main steam regulating combined valve, a steam extraction port is provided at the steam outlet of the high-pressure flow part, the steam extraction port is connected to the inlet of the reheater, and the outlet of the reheater passes through the reheated steam The regulating combined valve is connected to the steam inlet of the medium and low pressure flow parts; the front cylinder is a segmented combined structure, and the front cylinder includes a steam seal section, a front transition section, a main valve section, a rear transition section and a vertical flange section which are arranged and connected from front to back and relative to each other, and a flange cat claw section connecting the steam seal section, the front transition section, the main valve section, the rear transition section and the vertical flange section. The main valve section is provided with a main steam valve connection port for installing a high-pressure main steam regulating combined valve, and a reheat steam valve connection port for installing a reheat steam regulating combined valve is provided on one end of the rear transition section close to the main valve section, and the vertical flange section is connected to the exhaust cylinder.

[0007] Preferably, there are a plurality of rear transition sections, and the plurality of rear transition sections include at least one straight section and at least one inclined section.

[0008] Preferably, the front transition section is a straight section.

[0009] Preferably, the steam seal section, front transition section, main valve section, rear transition section and vertical flange section are all circular rings formed by two semicircular rings connected to each other, and there are two flange cat claw sections, and the two ends of the two semicircular rings of each circular ring are respectively connected by a flange cat claw section.

[0010] Preferably, each group of the front cylinder is formed into a segmented combined structure by integrally casting with a segmented wooden mold, or each group of the front cylinder is formed into a segmented combined structure by segment casting and then welding.

[0011] Preferably, the high-pressure flow portion and the medium- and low-pressure flow portions are arranged in counter-flow.

[0012] Preferably, the high-pressure flow-through portion comprises a high-pressure inner cylinder, and a first balancing piston steam seal and a second balancing piston steam seal are respectively provided at the front end and the rear end of the high-pressure inner cylinder.

[0013] Preferably, the medium- and low-pressure flow portion includes a medium-pressure inner cylinder, a first stationary blade holding ring and a second stationary blade holding ring arranged in sequence from front to back, and a third balancing piston steam seal is provided at the front end of the medium-pressure inner cylinder.

[0014] Preferably, a large hollow stationary blade partition is provided between the exhaust cylinder and the rotor.

[0015] Preferably, a front bearing seat is provided on the front side of the front cylinder, a radial thrust combined bearing is provided in the front bearing seat, a rear bearing seat is provided at the rear end of the exhaust cylinder, a radial bearing is provided in the rear bearing seat, and the front and rear ends of the rotor are supported by the radial thrust combined bearing and the radial bearing respectively.

[0016] Compared with the prior art, the present invention has significant improvements:

[0017] The high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine of the present invention adopts a segmented combined design for the front cylinder, and the front cylinder peripheral components and the front cylinder internal components are connected by a reasonable combination of different groups (steam seal section, front transition section, main valve section, rear transition section, vertical flange section and flange cat claw section) to form a modular design, so that each mature sub-functional module can be reasonably and quickly combined into a new model of steam turbine through each group, and at the same time, the production preparation work of large castings can be completed quickly by using the existing production modules of each group of the front cylinder, which greatly reduces the manufacturing cycle, can shorten the total manufacturing cycle by more than 20%, and compress the project construction cycle. The high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine of the present invention adopts a single-cylinder layout for the first time in the same level of reheat steam turbine units, greatly shortening the axial span of the unit, making the unit structure more compact, occupying less space, reducing the cost by more than 30%, and significantly reducing the cost of plant construction while significantly reducing the workload of unit installation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall layout of a high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine according to an embodiment of the present invention.

[0019] Figure 2 It is a schematic longitudinal section diagram of a high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine according to an embodiment of the present invention.

[0020] Figure 3 It is a split schematic diagram of the front cylinder in the high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine according to an embodiment of the present invention.

[0021] Figure 4 It is a schematic diagram of a sectioned longitudinal section of a front cylinder in a high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine according to an embodiment of the present invention.

[0022] The reference numerals are described as follows:

[0023] 1 Front cylinder 12 Third balance piston seal

[0024] 1-1 Steam seal section 13 front steam seal

[0025] 1-2 Front transition section 14 Hollow stationary blade large partition

[0026] 1-3 Main valve section 15 Exhaust guide ring

[0027] 1-31 Main steam valve connection port 16 Water spray pipeline

[0028] 1-4 Rear transition section 17 Rear steam seal

[0029] 1-41 Reheat valve connection port 18 Front bearing seat

[0030] 1-5 Vertical flange section 19 Radial thrust joint bearing

[0031] 1-6 Flange Cat's Paw Section 20 Rear Bearing Seat

[0032] 2 Cylinder 21 Radial bearing

[0033] 3 Rotor 22 Front bearing seat oil seal

[0034] 4 High-pressure main steam regulating combined valve 23 Rear bearing seat oil seal

[0035] 5 Reheat steam regulating combined valve 24 hydraulic turn

[0036] 6 High pressure inner cylinder 25 Manual turning

[0037] 7 Medium pressure inner cylinder 26 Front bearing seat plate

[0038] 8 First stationary blade holding ring 27 Exhaust cylinder plate

[0039] 9 Second stationary blade holding ring 28 Coupling cover

[0040] 10 First balance piston steam seal 29 Exhaust atmosphere diaphragm valve

[0041] 11 Second balance piston steam seal 30 High pressure regulating steam valve DETAILED DESCRIPTION

[0042] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0043] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0046] like Figures 1 to 4 As shown in FIG. 1 , an embodiment of a high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine of the present invention is shown. It should be noted that in the description of the present invention, the “front” side is defined as Figure 1 The left side of the paper; the "back" side is Figure 1 The right side of the paper; the "top" side is Figure 1 The upper side of the paper is also called the "top" side; the "lower" side is Figure 1 The lower side of the paper, the “lower” side is also called the “bottom” side.

[0047] See also Figure 1 and Figure 2The high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine of this embodiment includes a reheater (not shown in the figure), a front cylinder 1, an exhaust cylinder 2 connected to the rear end of the front cylinder 1, and a rotor 3 inserted in the front cylinder 1 and the exhaust cylinder 2. A high-pressure flow portion and a medium-low pressure flow portion are arranged in sequence from front to back between the front cylinder 1 and the rotor 3. The front cylinder 1, the exhaust cylinder 2, the rotor 3, the high-pressure flow portion and the medium-low pressure flow portion constitute a single-cylinder steam turbine, and the high-pressure flow portion and the medium-low pressure flow portion are integrated in the same cylinder (front cylinder 1), and the reheater is arranged outside the steam turbine. The main steam enters the steam inlet of the high-pressure flow portion through the high-pressure main steam regulating combined valve 4, and a steam extraction port is provided at the steam outlet of the high-pressure flow portion. The steam extraction port is connected to the inlet of the reheater through a cold reheat steam pipeline, and the outlet of the reheater is connected to the steam inlet of the medium-low pressure flow portion through a reheat steam pipeline and a reheat steam regulating combined valve 5. During operation, the main steam enters the steam inlet of the high-pressure flow section through the high-pressure main steam regulating combined valve 4, enters the inlet of the reheater from the steam extraction port at the steam outlet of the high-pressure flow section after doing work in the high-pressure flow section, enters the steam inlet of the medium-low pressure flow section from the outlet of the reheater through the reheat steam regulating combined valve 5 after being heated in the reheater, enters the steam inlet of the medium-low pressure flow section after doing work in the medium-low pressure flow section, and finally enters the condenser. The high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine of this embodiment adopts a single-cylinder layout for the first time in the reheat steam turbine units of the same level, greatly shortening the axial span of the unit, making the unit structure more compact, occupying less space, reducing the construction cost by more than 30%, and significantly reducing the cost of plant construction while significantly reducing the workload of unit installation and maintenance.

[0048] See also Figure 3 and Figure 4The front cylinder 1 of the high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine of this embodiment is a segmented combined structure, and the front cylinder 1 includes a steam seal section 1-1, a front transition section 1-2, a main valve section 1-3, a rear transition section 1-4, a vertical flange section 1-5 and a flange cat claw section 1-6, wherein the steam seal section 1-1, the front transition section 1-2, the main valve section 1-3, the rear transition section 1-4 and the vertical flange section 1-5 are arranged in sequence from front to back and connected to each other to form a rotating body that is internally penetrated along the axial direction (front and rear direction), and the flange cat claw section 1-6 is arranged on the outer side surface of the rotating body along the axial direction of the rotating body, and the flange cat claw section 1-6 connects the steam seal section 1-1, the front transition section 1-2, the main valve section 1-3, the rear transition section 1-4 and the vertical flange section 1-5 to form the overall structure of the front cylinder 1, the steam seal section 1-1 and the vertical flange section 1-5 are the front end and the rear end of the front cylinder 1 respectively, and the vertical flange section 1-5 is connected to the exhaust cylinder 2. The main valve section 1-3 is provided with a main steam valve connection port 1-31 for installing a high-pressure main steam regulating combined valve 4. The high-pressure main steam regulating combined valve 4 is installed at the main steam valve connection port 1-31 and connected to the steam inlet of the high-pressure flow section. The rear transition section 1-4 is provided with a reheat steam valve connection port 1-41 for installing a reheat steam regulating combined valve 5 at one end (the front end of the rear transition section 1-4) close to the main valve section 1-3. The reheat steam regulating combined valve 5 is installed at the reheat steam valve connection port 1-41 and connected to the steam inlet of the medium and low pressure flow section. The front cylinder 1 adopts a segmented combination design. Through the reasonable combination of different sections (steam seal section 1-1, front transition section 1-2, main valve section 1-3, rear transition section 1-4, vertical flange section 1-5 and flange cat claw section 1-6), the peripheral components of the front cylinder 1 and the internal components of the front cylinder 1 are connected to form a modular design, so that the mature sub-functional modules can be reasonably and quickly combined into a new type of steam turbine through each section. At the same time, by utilizing the existing production modules of the front cylinder 1 sections, the production preparation work of large castings can be quickly completed, which greatly reduces the manufacturing cycle, and can shorten the total manufacturing cycle by more than 20%, while compressing the project construction cycle.

[0049] In this embodiment, see Figure 3 and Figure 4Preferably, the rear transition section 1-4 of the front cylinder 1 is provided with a plurality of rear transition sections 1-4, and the plurality of rear transition sections 1-4 include at least one straight section and at least one inclined section. The straight section refers to a group section extending straightly in the axial direction of the front cylinder 1, that is, the diameter of the group section remains unchanged. The inclined section refers to a group section extending obliquely in the axial direction of the front cylinder 1, that is, the diameter of the group section gradually changes and is in a conical shape. The inclined section is used to connect the front and rear straight sections of the rear transition section 1-4 with different diameters, or to connect the main valve section 1-3 with the first straight section in the rear transition section 1-4, or to connect the last straight section in the rear transition section 1-4 with the vertical flange section 1-5, thereby realizing the diameter change requirement of the front cylinder 1 from the main valve section 1-3 to the vertical flange section 1-5. The number of straight sections and inclined sections in the rear transition section 1-4 is not limited, and the length of each straight section and inclined section (referring to the extension size in the front and rear direction) is also not limited, and can be divided and designed according to actual design requirements.

[0050] In this embodiment, preferably, the front transition section 1-2 of the front cylinder 1 is a straight section, which connects the steam seal section 1-1 and the main valve section 1-3. Of course, if the front cylinder 1 has a diameter change requirement from the steam seal section 1-1 to the main valve section 1-3, the front transition section 1-2 may also include an inclined section.

[0051] In this embodiment, the lengths of the various sections of the front cylinder 1 (steam seal section 1-1, front transition section 1-2, main valve section 1-3, rear transition section 1-4, vertical flange section 1-5 and flange cat's claw section 1-6) are not limited, and can be divided and designed in sections according to the actual design size requirements of the steam turbine unit. Generally speaking, the steam seal section 1-1 and the vertical flange section 1-5 are the front end and the rear end of the front cylinder 1 respectively, the front transition section 1-2 and the main valve section 1-3 roughly correspond to the position of the high-pressure flow part, the rear transition section 1-4 roughly corresponds to the position of the medium and low-pressure flow part, and the length of the flange cat's claw section 1-6 is not less than the total length of the steam seal section 1-1, the front transition section 1-2, the main valve section 1-3, the rear transition section 1-4 and the vertical flange section 1-5 after being connected in sequence.

[0052] See also Figure 3 and Figure 4 In this embodiment, preferably, the steam seal section 1-1, the front transition section 1-2, the main valve section 1-3, the rear transition section 1-4 and the vertical flange section 1-5 of the front cylinder 1 are all circular rings composed of two semicircular rings connected to each other, and two flange cat claw sections 1-6 are provided, and the two ends of the two semicircular rings of each circular ring are respectively connected by a flange cat claw section 1-6.

[0053] The front cylinder 1 of the segmented modular structure in this embodiment can have two preferred molding methods. In a preferred embodiment, each group of the front cylinder 1 (steam seal section 1-1, front transition section 1-2, main valve section 1-3, rear transition section 1-4, vertical flange section 1-5 and flange cat claw section 1-6) is formed into a segmented modular structure by a segmented wooden mold integral casting method. The segmented wooden mold integral casting method can effectively shorten the casting time. In another preferred embodiment, each group of the front cylinder 1 (steam seal section 1-1, front transition section 1-2, main valve section 1-3, rear transition section 1-4, vertical flange section 1-5 and flange cat claw section 1-6) is formed into a segmented modular structure by a segmented casting and then welding method, that is, each group of the front cylinder 1 is first cast and formed separately, and then the casted groups are connected and combined by welding to form a segmented modular structure of the front cylinder 1. The segmented casting and then welding method can realize that different groups are made of different materials, thereby reducing costs.

[0054] In this embodiment, preferably, the high-pressure flow portion and the medium-low pressure flow portion provided between the front cylinder 1 and the rotor 3 are arranged in a counter-flow form.

[0055] See also Figure 2The high-pressure flow section includes a high-pressure inner cylinder 6. A number of high-pressure stages are arranged between the high-pressure inner cylinder 6 and the rotor 3. Each high-pressure stage includes a row of stationary blades arranged on the high-pressure inner cylinder 6 and a row of moving blades arranged on the rotor 3. A steam flow channel is arranged between the high-pressure inner cylinder 6 and the front cylinder 1. The steam extraction port at the steam outlet of the high-pressure flow section is arranged on the front cylinder 1 and is located at the position of the high-pressure inner cylinder 6. A steam inlet is opened on the high-pressure inner cylinder 6. The high-pressure main steam regulating combined valve 4 is installed on the main steam valve connection port 1-31 on the main valve section 1-3 of the front cylinder 1 and is connected to the steam inlet on the high-pressure inner cylinder 6 to pass the main steam into the high-pressure inner cylinder 6. The medium- and low-pressure flow section includes a medium-pressure inner cylinder 7, a first stationary blade holding ring 8, and a second stationary blade holding ring 9 arranged from front to back. A number of medium-pressure stages are arranged between the medium-pressure inner cylinder 7 and the rotor 3, and each medium-pressure stage includes a row of stationary blades arranged on the medium-pressure inner cylinder 7 and a row of moving blades arranged on the rotor 3; a number of low-pressure stages are arranged between the first stationary blade holding ring 8 and the rotor 3, and between the second stationary blade holding ring 9 and the rotor 3, and each low-pressure stage includes a row of stationary blades arranged on the first stationary blade holding ring 8 (second stationary blade holding ring 9) and a row of moving blades arranged on the rotor 3. A steam inlet is provided on the medium-pressure inner cylinder 7, and the reheat steam regulating combined valve 5 is installed on the reheat steam valve connection port 1-41 on the transition section 1-4 after the front cylinder 1 and connected to the steam inlet on the medium-pressure inner cylinder 7 to pass reheat steam into the medium-pressure inner cylinder 7. During operation, the main steam enters the high-pressure inner cylinder 6 from the high-pressure main steam regulating combined valve 4 and flows from back to front in the high-pressure inner cylinder 6 to do work. The steam that has done work in each high-pressure stage flows back from front to back to the steam extraction port from the steam flow channel between the high-pressure inner cylinder 6 and the front cylinder 1, enters the reheater from the steam extraction port, and after being heated in the reheater, enters the medium-pressure inner cylinder 7 through the reheat steam regulating combined valve 5 and flows from front to back in the medium-pressure inner cylinder 7 to do work, then enters the exhaust cylinder 2, and finally enters the condenser.

[0056] Preferably, a first balancing piston steam seal 10 is provided at the front end of the high-pressure inner cylinder 6, and a second balancing piston steam seal 11 is provided at the rear end of the high-pressure inner cylinder 6. Preferably, two front steam seals 13 are provided in front of the first balancing piston steam seal 10 in the front cylinder 1. The steam seal section 1-1 of the front cylinder 1 roughly corresponds to the position of the two front steam seals 13.

[0057] Preferably, a third balancing piston steam seal 12 is provided at the front end of the medium-pressure inner cylinder 7 .

[0058] In this embodiment, preferably, a hollow stationary blade partition 14 is provided between the exhaust cylinder 2 and the rotor 3, and the hollow stationary blade partition 14 has two stages, front and rear. Preferably, an exhaust guide ring 15 is provided at the rear end side of the rear stage hollow stationary blade partition 14.

[0059] Preferably, a water spray pipeline 16 is provided in the exhaust cylinder 2, and the water spray pipeline 16 is preferably controlled by a low-pressure cylinder water spray device.

[0060] Preferably, two rear steam seals 17 are provided at the rear end of the exhaust cylinder 2 .

[0061] In this embodiment, see Figure 2 Preferably, a front bearing seat 18 is provided at the front side of the front cylinder 1, and a radial thrust joint bearing 19 is provided in the front bearing seat 18, which is a floor-mounted sliding arrangement, and is equipped with a hydraulic cranking 24 and a manual cranking 25. A rear bearing seat 20 is provided at the rear end of the exhaust cylinder 2, and a radial bearing 21 is provided in the rear bearing seat 20. The front and rear ends of the rotor 3 are supported by the radial thrust joint bearing 19 and the radial bearing 21, respectively. Preferably, a front bearing seat oil seal 22 is provided at the rear end of the front bearing seat 18, and a rear bearing seat oil seal 23 is provided at the front and rear ends of the rear bearing seat 20. Each bearing is equipped with high-pressure jacking oil, and the high-pressure jacking oil is put in when the unit is cranked and the turbine is started to lift the rotor 3. The high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine of this embodiment adopts a double-pivot, long-span shaft system design (span 6500mm) for the first time in units of the same power level. Through dynamic calculation and analysis, the rotor structure is optimized, which can make the rotor have stronger anti-interference ability and better stability, ensuring the safe and reliable operation of the unit. In addition, based on the disturbance amplitude of the long-shaft rotor during operation, the radial clearance setting is optimized at the vibration-sensitive point, which can ensure the reliable operation of the unit while ensuring the efficiency of the unit.

[0062] In this embodiment, the front bearing seat 18 is arranged on the front bearing seat base plate 26, the rear bearing seat 20 and the exhaust cylinder 2 are arranged on the exhaust cylinder base plate 27, the rear end of the exhaust cylinder 2 is connected to the coupling cover 28, and the top of the exhaust cylinder 2 is provided with an exhaust diaphragm valve 29.

[0063] The high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine of this embodiment is provided with two main steam lines and one reheat steam line, and accordingly, two sets of high-pressure main steam regulating combined valves 4 and one set of reheat steam regulating combined valves 5 are provided. Figure 2 and Figure 3 Two sets of high-pressure main steam regulating combined valves 4 are arranged on both sides of the front cylinder 1, and each set of high-pressure main steam regulating combined valves 4 includes a high-pressure main steam valve and two high-pressure regulating steam valves 30, and the high-pressure regulating steam valves 30 are connected to the steam inlet of the high-pressure flow part. A set of reheat steam regulating combined valves 5 is arranged on one side of the front cylinder 1, and the reheat steam regulating combined valves 5 include a reheat main steam valve and a reheat regulating steam valve, and the reheat regulating steam valve is connected to the steam inlet of the medium and low pressure flow part.

[0064] The power of the high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine of this embodiment can reach 150MW with the change of steam parameters, and the highest steam parameters can be used at 566℃ and 16.7Mpa. After the steam passes through the high-pressure flow part of the front cylinder 1 to do work, it is heated to 566℃ by the reheater and returns to the medium and low pressure flow part of the front cylinder 1 to continue to do work. The speed can be set to 3000r / min or 3600r / min as needed. The high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine of this embodiment has the characteristics of high power, high parameters, small footprint, low investment and operation cost, and short construction period.

[0065] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine, characterized in that: The invention comprises a reheater, a front cylinder (1), an exhaust cylinder (2) connected to the rear end of the front cylinder (1), and a rotor (3) penetrating the front cylinder (1) and the exhaust cylinder (2); a high-pressure flow portion and a medium-low-pressure flow portion are arranged in sequence from front to back between the front cylinder (1) and the rotor (3); main steam enters the steam inlet of the high-pressure flow portion through a high-pressure main steam regulating combined valve (4); a steam extraction port is arranged at the steam outlet of the high-pressure flow portion, the steam extraction port is connected to the inlet of the reheater, and the outlet of the reheater is connected to the steam inlet of the medium-low-pressure flow portion through a reheat steam regulating combined valve (5); the front cylinder (1) is a segmented combined structure, and the front cylinder (1) comprises steam seals arranged in sequence from front to back and connected to each other. The invention relates to a steam seal section (1-1), a front transition section (1-2), a main valve section (1-3), a rear transition section (1-4) and a vertical flange section (1-5), and a flange cat claw section (1-6) connecting the steam seal section (1-1), the front transition section (1-2), the main valve section (1-3), the rear transition section (1-4) and the vertical flange section (1-5); the main valve section (1-3) is provided with a main steam valve connection port (1-31) for installing the high-pressure main steam regulating combined valve (4); the rear transition section (1-4) is provided with a reheat steam valve connection port (1-41) for installing the reheat steam regulating combined valve (5) at one end close to the main valve section (1-3); and the vertical flange section (1-5) is connected to the exhaust cylinder (2).

2. The high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine according to claim 1 is characterized in that: The rear transition sections (1-4) are provided in plurality, and the plurality of rear transition sections (1-4) include at least one straight section and at least one inclined section.

3. The high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine according to claim 1, characterized in that: The front transition section (1-2) is a straight section.

4. The high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine according to claim 1, characterized in that: The steam seal section (1-1), the front transition section (1-2), the main valve section (1-3), the rear transition section (1-4) and the vertical flange section (1-5) are all circular rings formed by two semicircular rings connected to each other, and two flange cat claw sections (1-6) are provided, and the two ends of the two semicircular rings of each circular ring are connected by one flange cat claw section (1-6) respectively.

5. The high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine according to claim 1, characterized in that: The various groups of the front cylinder (1) are integrally cast using a segmented wooden mold to form the segmented combined structure, or the various groups of the front cylinder (1) are welded after segmented casting to form the segmented combined structure.

6. The high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine according to claim 1, characterized in that: The high-pressure flow portion and the medium- and low-pressure flow portions are arranged in a counter-flow manner.

7. The high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine according to claim 1, characterized in that: The high-pressure flow-through portion comprises a high-pressure inner cylinder (6), and a first balancing piston steam seal (10) and a second balancing piston steam seal (11) are respectively arranged at the front end and the rear end of the high-pressure inner cylinder (6).

8. The high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine according to claim 1, characterized in that: The medium- and low-pressure flow passages include a medium-pressure inner cylinder (7), a first stationary blade holding ring (8) and a second stationary blade holding ring (9) arranged in sequence from front to back, and a third balancing piston steam seal (12) is provided at the front end of the medium-pressure inner cylinder (7).

9. The high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine according to claim 1, characterized in that: A large hollow stationary blade partition (14) is provided between the exhaust cylinder (2) and the rotor (3).

10. The high-power subcritical ultra-high temperature single-cylinder reheat condensing steam turbine according to claim 1, characterized in that: A front bearing seat (18) is provided at the front side of the front cylinder (1), a radial thrust combined bearing (19) is provided in the front bearing seat (18), a rear bearing seat (20) is provided at the rear end of the exhaust cylinder (2), a radial bearing (21) is provided in the rear bearing seat (20), and the front end and rear end of the rotor (3) are supported by the radial thrust combined bearing (19) and the radial bearing (21) respectively.

Images