Bypass steam inlet tool of steam turbine

Abstract

The utility model discloses a bypass steam admission tool of a steam turbine, and relates to the technical field of steam admission tools of steam turbines. The hydraulic cylinder comprises a main cylinder body. According to the utility model, the backflow conversion device is respectively connected with the steam storage device and the bypass valve, so that when the residual steam after working in the main cylinder body is finished is output and can be matched with the operation of the backflow conversion device to store the steam in the steam storage device, the communication port of the bypass valve is closed, so that the residual steam can be effectively recovered to supplement steam under extreme working conditions; when the steam inlet condition of the steam turbine is worst, after the interior of the main cylinder body does work continuously, residual steam refluxed in the main cylinder body is matched with the backflow conversion device to close the communicating opening of the steam storage device, directly flows back to the bypass valve and then enters the main cylinder body to conduct steam supplementing work, and therefore under the special working condition, the number of backflow channels of steam can be reduced, the speed ratio is increased, and the working efficiency is improved. Therefore, the steam wheel cycle efficiency is higher, pressure-stage expansion work doing is conducted to meet the steam inlet requirement under the extreme working condition, and then the wheel cycle efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam turbine steam inlet tooling, and in particular relates to a bypass steam inlet tooling of a steam turbine. Background Art

[0002] Steam turbine, also known as steam turbine engine, is a rotary steam power device. The working principle of steam turbine is to use high temperature and high pressure steam to pass through a fixed nozzle to become an accelerated airflow, and then spray it onto the blades to rotate the rotor equipped with blade rows, thereby doing work externally and converting the thermal energy of steam into mechanical work. The so-called bypass system refers to a system in which the steam generated by the boiler partially or completely bypasses the steam turbine or reheater and is directly discharged into the condenser through the temperature and pressure reduction equipment (bypass valve).

[0003] In the prior art, after searching, Chinese patent No. CN202121053712.1 discloses a bypass steam inlet structure of a steam turbine, including a main steam valve, an outer cylinder and two halves of an inner cylinder. The outer cylinder is sleeved on the outside of the two halves of the inner cylinder, the main steam valve is connected to the two halves of the inner cylinder, and multiple groups of regulating valves are arranged between the main steam valve and the two halves of the inner cylinder. The multiple groups of regulating valves are arranged in a straight line, and a group of bypass valves are arranged on the side of a group of regulating valves located on the outermost side, and the output port of the bypass valve is connected to the two halves of the inner cylinder.

[0004] In order to ensure the working capacity of existing steam turbines under special working conditions, that is, low parameters, and meet the power requirements of steam turbines under extreme working conditions, the design is usually to lower the pressure after the regulating stage and increase the pressure difference before and after the stage, that is, before and after the nozzle, so as to improve the steam passing capacity per unit area of ​​the nozzle and achieve the purpose of reducing the height of the regulating stage blades. However, the result of this setting is that the enthalpy drop of the regulating stage is too large, the speed ratio is too small, and the steam inlet and steam supplement efficiency is low, resulting in waste of equipment energy and increased use costs.

[0005] Currently, no effective solution has been proposed for the problems in the related technologies. Utility Model Content

[0006] In view of the problems in the related technology, the utility model proposes a bypass steam inlet tooling of a steam turbine to overcome the above technical problems existing in the existing related technology.

[0007] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0008] The utility model is a bypass steam inlet tooling of a steam turbine, comprising a main cylinder body, a steam inlet valve is arranged on the top of the main cylinder body, a first steam inlet pipe is arranged on one side of the steam inlet valve, a second steam inlet pipe is arranged on the other side of the steam inlet valve, the second steam inlet pipe is connected with a bypass valve, a steam outlet mechanism is arranged at the bottom of the main cylinder body, a reflux pipe is arranged on one side of the steam outlet mechanism, a reflux conversion device is connected to the output end of the reflux pipe, one side of the reflux conversion device is connected to the bypass valve, a steam storage device is arranged on one side of the reflux conversion device, and an output pipe is connected to the steam storage device.

[0009] Furthermore, a steam inlet end is provided at the top of the main cylinder body, and a first steam inlet port and a second steam inlet port are respectively opened at the top of the steam inlet end. There are several groups of steam inlet valves, and the bottoms of two groups of steam inlet valves are respectively connected to the first steam inlet port and the second steam inlet port.

[0010] Furthermore, a third steam inlet is provided at the top of the steam inlet end, a bypass pipe is connected to the bypass valve, and an output end of the bypass pipe is communicated with the third steam inlet.

[0011] Furthermore, the steam outlet mechanism includes a steam outlet pipe, the steam outlet pipe is connected to a bypass return pipe, and the interior of the bypass return pipe is connected to the return pipe.

[0012] Furthermore, the reflux conversion device includes a three-way valve tube, one of the pipe openings of the three-way valve tube is connected to the steam storage device, a steam inlet chamber is opened inside the three-way valve tube, a driving motor is arranged on the top of the three-way valve tube, the output end of the driving motor is fixedly connected to a driving shaft, and the outer surface of the driving shaft is fixedly connected to a hemispherical valve.

[0013] Furthermore, the steam storage device includes a steam storage chamber, and a steam storage pipe is provided on the outer surface of the steam storage chamber, and the steam storage pipe is connected to one of the pipe openings of the three-way valve pipe.

[0014] Furthermore, a second driving motor is arranged on the top of the steam storage chamber, a threaded rod is arranged at the output end of the second driving motor, and a piston plate is threadedly connected to the threaded rod.

[0015] The utility model has the following beneficial effects:

[0016] 1. The utility model connects the reflux conversion device with the steam storage device and the bypass valve respectively. When the residual steam after the work inside the main cylinder is completed is output and can cooperate with the operation of the reflux conversion device to store gas in the steam storage device, the bypass valve connecting port is closed, so that the residual steam can be effectively recovered for steam supplement under extreme working conditions. When the steam inlet condition of the steam turbine is the worst, the residual steam remaining in the main cylinder after continuous work is done inside the main cylinder cooperates with the reflux conversion device to close the connecting port of the steam storage device and directly reflux to the bypass valve and then enter the main cylinder to perform steam supplement work. Therefore, under special working conditions, the reflux channel of steam can be reduced, the speed ratio can be improved, and the steam turbine efficiency can be higher to perform pressure stage expansion work to meet the steam inlet requirements under extreme working conditions, thereby improving the turbine efficiency.

[0017] 2. The central part of the three-way valve pipe of the utility model is a spherical body, wherein three groups of pipe openings are respectively connected with the reflux pipe, the bypass valve and the steam storage device. When the main cylinder body meets the normal steam intake, the remaining steam enters the three-way valve pipe through the reflux pipe, and at the same time, the driving motor drives the driving shaft to drive the semi-spherical valve to operate and close the connecting port of the adjacent bypass valve, and the reflux steam enters the steam storage device for storage. When the steam intake amount inside the main cylinder body is poor, the reflux gas enters the reflux pipe, and the driving motor drives the semi-spherical valve to operate in the reverse direction to close the connecting port of the steam storage device and open the connecting port of the bypass valve, so that the reflux steam directly enters the bypass valve for pressure regulation and then directly enters the third steam inlet to flow to the inside of the main cylinder body to increase the pressure level and expand to do work, so that the reflux gas can be efficiently recycled.

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the utility model embodiments, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0021] Figure 2 This is the second schematic diagram of the three-dimensional structure of the utility model;

[0022] Figure 3 This is a schematic diagram of the steam outlet pipe structure of the utility model;

[0023] Figure 4 This is a schematic diagram of the steam inlet structure of the utility model;

[0024] Figure 5 This is a schematic diagram of the internal structure of the three-way valve pipe of the utility model;

[0025] Figure 6 This is a schematic diagram of the internal structure of the steam storage chamber of the utility model;

[0026] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0027] 1. Main cylinder body; 2. Steam inlet valve; 3. First steam inlet pipe; 13. Second steam inlet pipe; 4. Bypass valve; 5. Steam outlet mechanism; 6. Reflux pipe; 7. Reflux conversion device; 8. Steam storage device; 9. Output pipe; 10. Steam inlet end; 11. First steam inlet port; 12. Second steam inlet port; 14. Third steam inlet port; 15. Bypass pipe; 501. Steam outlet pipe; 502. Bypass reflux pipe; 701. Three-way valve pipe; 702. Steam inlet chamber; 703. Drive motor; 704. Drive shaft; 705. Hemispherical valve; 801. Steam storage chamber; 802. Steam storage pipe; 803. Second drive motor; 804. Threaded rod; 805. Piston plate. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the utility model embodiments to clearly and completely describe the technical solutions in the utility model embodiments. Obviously, the described embodiments are only part of the utility model embodiments, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present utility model, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inside" and the like indicating orientation or positional relationship are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] See also Figure 2 , Figure 5 As shown, the utility model is a bypass steam inlet tooling of a steam turbine, comprising a main cylinder body 1, a steam inlet valve 2 is arranged on the top of the main cylinder body 1, a first steam inlet pipe 3 is arranged on one side of the steam inlet valve 2, a second steam inlet pipe 13 is arranged on the other side of the steam inlet valve 2, a bypass valve 4 is connected to the second steam inlet pipe 13, a steam outlet mechanism 5 is arranged on the bottom of the main cylinder body 1, a return pipe 6 is arranged on one side of the steam outlet mechanism 5, a return flow conversion device 7 is connected to the output end of the return pipe 6, one side of the return flow conversion device 7 is connected to the bypass valve 4, a steam storage device 8 is arranged on one side of the return flow conversion device 7, and an output pipe 9 is connected to the steam storage device 8.

[0031] When in use, the first steam inlet pipe 3 is connected to the steam supply equipment. Under normal working conditions, the steam inlet flow rate is adjusted in conjunction with the steam inlet valve 2 so that steam is input into the main cylinder 1 to ensure normal steam supply requirements. When the steam inlet amount inside the main cylinder 1 is sufficient, its bypass valve 4 is closed and there is no need to supplement steam to the main cylinder 1. At the same time, the remaining steam after work is done inside the main cylinder 1 flows back to the reflux pipe 6 through the steam outlet mechanism 5 connected to the inside of the main cylinder 1. At this time, the reflux conversion device 7 is closed and the pipe port connected to the bypass valve 4 is closed. The reflux conversion device 7 is used to convert the remaining steam into steam. It is recovered and transported to the steam storage device 8 as reserve circulating steam. When the steam turbine encounters extreme operating conditions, the bypass valve 4 is opened. At this time, the steam in the steam storage device 8 will be transported to the main cylinder 1 through the bypass valve 4 for expansion and work. When the residual steam in the steam storage device 8 is insufficient, the reflux pipe 6 cooperates with the reflux conversion device 7 to open the connection port with the bypass valve 4 and close the connection port with the steam storage device 8, so that the reflux steam directly enters the bypass valve 4 through the reflux conversion device 7 and then is directly transported to the inside of the main cylinder 1 for steam supplement expansion and work.

[0032] In the utility model, the reflux conversion device 7 is connected to the steam storage device 8 and the bypass valve 4 respectively. When the residual steam after the work inside the main cylinder body 1 is completed is output and can cooperate with the operation of the reflux conversion device 7 to store air in the steam storage device 8, the connecting port of the bypass valve 4 is closed, so that the residual steam can be effectively recovered for steam supplement under extreme working conditions. When the steam inlet condition of the steam turbine is the worst, the residual steam remaining in the main cylinder body 1 after continuous work is done inside the main cylinder body 1 cooperates with the reflux conversion device 7 to close the connecting port of the steam storage device 8 and directly reflux to the bypass valve 4 and then enters the main cylinder body 1 to perform steam supplement work. Therefore, under special working conditions, the reflux channel of steam can be reduced, the speed ratio can be improved, and the steam turbine efficiency can be higher to perform pressure stage expansion work to meet the steam inlet requirements under extreme working conditions, thereby improving the turbine efficiency.

[0033] In one embodiment, for the above-mentioned main cylinder body 1, a steam inlet end 10 is provided at the top of the main cylinder body 1, and a first steam inlet port 11 and a second steam inlet port 12 are respectively opened at the top of the steam inlet end 10. There are several groups of steam inlet valves 2, and the bottoms of two groups of steam inlet valves 2 are respectively connected to the first steam inlet port 11 and the second steam inlet port 12.

[0034] By connecting two groups of steam inlet valves 2 with the first steam inlet port 11 and the second steam inlet port 12, when the normal steam inlet demand is met, the steam supply end enters the multiple groups of steam inlet valves 2 through the first steam inlet pipe 3 to adjust the pressure level of the steam flow, so that the steam can meet the expansion work inside the main cylinder 1. The second steam inlet port 12 is connected to the steam inlet valve 2 near one end of the bypass valve 4. When the steam storage device 8 and the return pipe 6 do not meet the supplementary steam intake, the new steam flows through the second steam inlet pipe 13 on the side of the bypass valve 4 to the steam inlet valve 2, and then enters the main cylinder 1 after the pressure level is adjusted to provide it with expansion work requirements.

[0035] In one embodiment, for the steam inlet end 10 , a third steam inlet port 14 is provided at the top of the steam inlet end 10 , a bypass pipe 15 is connected to the bypass valve 4 , and an output end of the bypass pipe 15 is communicated with the third steam inlet port 14 .

[0036] By connecting the bypass pipe 15 with the third steam inlet 14 , when the residual steam in the reflux conversion device 7 enters the bypass valve 4 , it is regulated by the bypass valve 4 and directly flows into the bypass pipe 15 and cooperates with the third steam inlet 14 to enter the main cylinder 1 .

[0037] By arranging the third steam inlet 14 on the top of the main cylinder body 1 and connecting it with the bypass valve 4 in coordination with the bypass pipe 15, the return steam can shorten the return distance of the steam inlet, thereby increasing the wheel circulatory utilization efficiency.

[0038] In one embodiment, for the steam outlet mechanism 5 , the steam outlet mechanism 5 includes a steam outlet pipe 501 , and a bypass return pipe 502 is connected to the steam outlet pipe 501 . The interior of the bypass return pipe 502 is connected to the return pipe 6 .

[0039] The steam outlet pipe 501 is connected to the bottom of the main cylinder body 1. When the steam expansion work inside the main cylinder body 1 is completed, the steam with residual heat enters the steam outlet pipe 501 and cooperates with the reflux conversion device 7 to open the internal steam inlet, so that the residual steam can quickly return to the reflux pipe 6 and then be converted through the reflux conversion device 7 to enable it to be stored or directly refluxed for utilization.

[0040] In one embodiment, for the above-mentioned reflux conversion device 7, the reflux conversion device 7 includes a three-way valve tube 701, one of the pipe openings of the three-way valve tube 701 is connected to the steam storage device 8, a steam inlet chamber 702 is opened inside the three-way valve tube 701, a driving motor 703 is arranged on the top of the three-way valve tube 701, the output end of the driving motor 703 is fixedly connected to a driving shaft 704, and the outer surface of the driving shaft 704 is fixedly connected to a hemispherical valve 705.

[0041] The central part of the three-way valve tube 701 is a spherical body, wherein the three groups of pipe openings are respectively connected to the return pipe 6, the bypass valve 4 and the steam storage device 8. When the main cylinder body 1 meets the normal steam intake, the remaining steam enters the three-way valve tube 701 through the return pipe 6, and at the same time, the driving motor 703 drives the driving shaft 704 to drive the semi-ball valve 705 to operate and close the connecting port of the adjacent bypass valve 4, and the return steam enters the steam storage device 8 for storage. When the steam intake amount inside the main cylinder body 1 is poor, its return gas enters the return pipe 6, and its driving motor 703 drives the semi-ball valve 705 to operate in the opposite direction to close the connecting port of the steam storage device 8 and open the connecting port of the bypass valve 4, so that the return steam directly enters the bypass valve 4 for pressure regulation and then directly enters the third steam inlet 14 to flow to the inside of the main cylinder body 1 to increase the pressure level and expand to do work, so that the return gas can be efficiently recycled.

[0042] In one embodiment, for the above-mentioned steam storage device 8, the steam storage device 8 includes a steam storage chamber 801, and a steam storage pipe 802 is provided on the outer surface of the steam storage chamber 801. The steam storage pipe 802 is connected to one of the pipe openings of the three-way valve pipe 701.

[0043] When the semi-ball valve 705 closes the connecting port of the bypass valve 4, its connecting port with the steam storage pipe 802 is opened, so that the reflux steam in the reflux pipe 6 enters the steam storage chamber 801 through the steam storage pipe 802 for storage, so as to provide steam supplement when special working conditions occur later.

[0044] In one embodiment, for the steam storage chamber 801 , a second driving motor 803 is disposed on the top of the steam storage chamber 801 , a threaded rod 804 is disposed at the output end of the second driving motor 803 , and a piston plate 805 is threadedly connected to the threaded rod 804 .

[0045] The threaded rod 804 is driven by the second drive motor 803 to operate so as to drive the piston plate 805 to rise or fall and pressurize the inside of the steam storage chamber 801. When the reflux steam enters the steam storage chamber 801, the piston plate 805 is driven to rise to increase the steam storage cavity space inside the steam storage chamber 801. When the steam storage chamber 801 needs steam supply, the piston plate 805 is driven to move downward and pressurize, so that the pressure level of the reserved steam is increased before entering the bypass valve 4, thereby reducing the pressure level adjustment process and improving the efficiency of the steam supplement work.

[0046] Through the above technical scheme, 1. By connecting the reflux conversion device 7 with the steam storage device 8 and the bypass valve 4 respectively, when the residual steam after the work inside the main cylinder body 1 is completed is output, it can cooperate with the operation of the reflux conversion device 7. When the steam storage device 8 stores gas, the bypass valve 4 connection port is closed, so that the residual steam can be effectively recovered for steam supplement under extreme working conditions. When the steam inlet condition of the steam turbine is the worst, the residual steam remaining in the main cylinder body 1 after continuous work is done inside the main cylinder body 1 cooperates with the reflux conversion device 7 to close the connection port of the steam storage device 8 and directly reflux to the bypass valve 4 and then enter the main cylinder body 1 to perform steam supplement work. Therefore, under special working conditions, the reflux channel of steam can be reduced, the speed ratio can be improved, and the steam turbine efficiency can be higher to perform pressure stage expansion work to meet the steam inlet requirements under extreme working conditions, thereby improving the turbine efficiency; 2. The three-way valve pipe The central part of 701 is a sphere, in which three groups of pipe openings are connected to the return pipe 6, the bypass valve 4 and the steam storage device 8 respectively. When the main cylinder body 1 meets the normal steam intake, the remaining steam enters the three-way valve pipe 701 through the return pipe 6. At the same time, the driving motor 703 drives the driving shaft 704 to drive the semi-ball valve 705 to operate and close the connecting port of the adjacent bypass valve 4, and the return steam enters the steam storage device 8 for storage. When the steam intake amount inside the main cylinder body 1 is poor, its return gas enters the return pipe 6, and its driving motor 703 drives the semi-ball valve 705 to operate in the opposite direction to close the connecting port of the steam storage device 8 and open the connecting port of the bypass valve 4, so that the return steam directly enters the bypass valve 4 for pressure regulation and then directly enters the third steam inlet 14 to flow to the inside of the main cylinder body 1 to increase the pressure level and expand to do work, so that the return gas can be efficiently recycled.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0048] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A steam turbine bypass inlet tooling, comprising a main cylinder (1), characterized in that: A steam inlet valve (2) is arranged at the top of the main cylinder body (1), a first steam inlet pipe (3) is arranged on one side of the steam inlet valve (2), a second steam inlet pipe (13) is arranged on the other side of the steam inlet valve (2), the second steam inlet pipe (13) is connected to a bypass valve (4), a steam outlet mechanism (5) is arranged at the bottom of the main cylinder body (1), a return pipe (6) is arranged on one side of the steam outlet mechanism (5), an output end of the return pipe (6) is connected to a return flow conversion device (7), one side of the return flow conversion device (7) is connected to the bypass valve (4), a steam storage device (8) is arranged on one side of the return flow conversion device (7), and an output pipe (9) is connected to the steam storage device (8).

2. A steam turbine bypass inlet tooling according to claim 1, characterized in that: The top of the main cylinder body (1) is provided with a steam inlet end (10), the top of the steam inlet end (10) is respectively provided with a first steam inlet port (11) and a second steam inlet port (12), and the steam inlet valves (2) are provided in a plurality of groups, wherein the bottoms of two groups of steam inlet valves (2) are respectively connected to the first steam inlet port (11) and the second steam inlet port (12).

3. A steam turbine bypass inlet tooling according to claim 2, characterized in that: A third steam inlet (14) is provided at the top of the steam inlet end (10), a bypass pipe (15) is connected to the bypass valve (4), and an output end of the bypass pipe (15) is connected to the third steam inlet (14).

4. A steam turbine bypass inlet tooling according to claim 1, characterized in that: The steam outlet mechanism (5) comprises a steam outlet pipe (501), the steam outlet pipe (501) is connected to a bypass return pipe (502), and the interior of the bypass return pipe (502) is connected to the return pipe (6).

5. The bypass steam inlet tooling of a steam turbine according to claim 1, characterized in that: The reflux conversion device (7) comprises a three-way valve tube (701), one of the pipe openings of the three-way valve tube (701) is connected to the steam storage device (8), a steam inlet chamber (702) is provided inside the three-way valve tube (701), a driving motor (703) is arranged on the top of the three-way valve tube (701), the output end of the driving motor (703) is fixedly connected to a driving shaft (704), and the outer surface of the driving shaft (704) is fixedly connected to a semi-ball valve (705).

6. The bypass steam inlet tooling of a steam turbine according to claim 1, characterized in that: The steam storage device (8) comprises a steam storage chamber (801), the outer surface of which is provided with a steam storage pipe (802), and the steam storage pipe (802) is connected to one of the pipe openings of the three-way valve pipe (701).

7. A steam turbine bypass inlet tooling according to claim 6, characterized in that: A second driving motor (803) is disposed on the top of the steam storage chamber (801), a threaded rod (804) is disposed at the output end of the second driving motor (803), and a piston plate (805) is threadedly connected to the threaded rod (804).

Images