Steam turbine pipeline flash tank drain recovery device and system

Abstract

The invention relates to the technical field of thermal power plant steam turbines, in particular to a steam turbine pipeline flash tank drain water recovery device and system. The pressure sensor is arranged on one side of the pipeline flash tank; the fixing mechanism comprises a mounting block arranged on the pipeline flash tank, a vertical groove and a horizontal groove are formed in the mounting block, a limiting assembly for limiting the pressure sensor is arranged in the horizontal groove, and an extrusion assembly for ensuring sealing between the pressure sensor and the pipeline flash tank is arranged in the vertical groove; through the arrangement of the limiting assembly, rapid installation of the pressure sensor can be realized, through the arrangement of the extrusion assembly, on the basis of the limiting assembly, the installation of the pressure sensor is further optimized, so that the pressure sensor and the installation block are tightly attached, and the installation efficiency of the pressure sensor is improved. And the sealing performance of the pipeline flash tank after the pressure sensor is installed is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines in thermal power plants, in particular to a steam turbine pipeline expansion tank drain recovery device and system. Background Art

[0002] The water seal device is a device that uses a certain height of static water pressure to resist the change of air pressure in the drain pipe and prevent gas from entering the condenser chamber.

[0003] In the current stage, under the background of power marketization, when the steam turbine generator sets in thermal power plants participate in deep load peak regulation, the condensate water used as the sealing water source of the water seal device changes greatly with the large-scale adjustment of the unit load (P = 0.8 ~ 3.0MPa). At the same time, the vacuum of the steam turbine unit is also changing. When the load decreases, the vacuum of the condenser increases. Pulling out the sealing water of the water seal device will naturally cause a large amount of non-condensable gas to enter the condenser, causing the vacuum to drop, and the unsafe event of the steam turbine generator set shutting down due to low vacuum protection will occur;

[0004] And because the water entering the pipeline expansion tank has a certain water pressure, when the water pressure inside the pipeline expansion tank reaches the set value, the corresponding valve needs to be opened to reduce the water pressure inside the pipeline expansion tank. In the prior art, most pressure detection devices use pressure sensors, and most pressure sensors are installed on the pipeline expansion tank by threads. The thread installation requires precise thread matching. If there is a certain gap at the connection, the pipeline expansion tank is connected to the outside, which causes the internal air pressure of the pipeline expansion tank to be unstable, thereby affecting the use of the device.

[0005] Therefore, a steam turbine pipeline expansion tank drain recovery device and system are proposed. Summary of the invention

[0006] In view of the fact that the pressure sensor in the above or prior art is installed on the pipe expansion container by thread, and the thread installation requires precise thread matching, if there is a certain gap at the connection, the pipe expansion container will be connected to the outside, thereby causing the internal air pressure of the pipe expansion container to be unstable, thereby affecting the use of the device, the present invention is proposed.

[0007] Therefore, an object of the present invention is to provide a steam turbine pipeline expansion tank drain recovery device.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising:

[0009] Pipeline expansion tank;

[0010] A pressure sensor, which is arranged on one side of the pipeline expansion tank;

[0011] A fixing mechanism, comprising a mounting block arranged on the pipeline expansion container, the mounting block being provided with a vertical groove and a horizontal groove, a limiting component for limiting the pressure sensor being arranged inside the horizontal groove, and an extrusion component for ensuring the sealing between the pressure sensor and the pipeline expansion container being arranged inside the vertical groove;

[0012] The vertical groove is communicated with the horizontal groove.

[0013] As a preferred solution of the steam turbine pipeline expansion tank drain recovery device of the present invention, the limiting assembly includes a telescopic rod and a first spring arranged inside the horizontal groove, the first spring is sleeved on the surface of the telescopic rod, the ends of the telescopic rod and the first spring away from the vertical groove are connected to the inner wall of the horizontal groove, and the other ends of the telescopic rod and the first spring are connected to the first slider, the first slider is connected to a bracket, and the bracket is connected to a limiting plate.

[0014] As a preferred solution of the steam turbine pipeline expansion tank drain recovery device of the present invention, wherein: the extrusion assembly includes a second slider disposed inside the vertical groove, and the second slider is provided with a first inclined surface;

[0015] The first sliding block is provided with a second inclined surface;

[0016] The first inclined surface corresponds to the second inclined surface.

[0017] As a preferred solution of the steam turbine pipeline expansion tank drain recovery device of the present invention, wherein: the end of the limit plate away from the pressure sensor is connected to a force-bearing plate, the end of the force-bearing plate is a semicircular arc surface, the first slider is connected to a second spring, and the end of the second spring away from the first slider is connected to the limit plate.

[0018] As a preferred solution of the steam turbine pipeline expansion tank drain recovery device of the present invention, the extrusion assembly further includes a column connected to the second slider, a third inclined surface is provided on the column, and a gap is formed between the column and the second slider.

[0019] As a preferred solution of the steam turbine pipeline expansion tank drain recovery device of the present invention, wherein: a third slide groove is opened on the mounting block, a third slider and a third spring are arranged inside the third slide groove, one end of the third slider extends out of the third slide groove and is connected to the second slider, one end of the third spring is connected to the inner wall of the third slide groove, and the other end of the third spring is connected to the third slider.

[0020] As a preferred solution of the steam turbine pipeline expansion tank drain recovery device of the present invention, the vertical groove is divided into an upper groove and a lower groove with the horizontal groove as the boundary, and the sizes of the upper groove and the lower groove are matched with the second sliding block.

[0021] Beneficial effects of the steam turbine pipeline expansion tank drain recovery device of the present invention: the present invention can realize the rapid installation of the pressure sensor through the setting of the limit component, and through the setting of the extrusion component, on the basis of the limit component, the installation of the pressure sensor is further optimized, so that the pressure sensor and the installation block are tightly fitted, thereby ensuring the sealing of the pipeline expansion tank after the pressure sensor is installed.

[0022] In actual use, when a thermal power plant participates in deep peak-shaving of the power grid, after the drain recovery system with a water seal device is connected to the condenser, the working conditions of the water seal device change drastically and the pressure of the condensate used in the water seal device fluctuates drastically. The superposition effect of the two causes the water seal device to fail, and a large amount of non-condensable gas enters the condenser, causing an unsafe event in which the steam turbine generator set is shut down due to low vacuum protection.

[0023] In order to solve the above technical problems, the present invention also provides the following technical solutions: a steam turbine pipeline expansion tank drain recovery system, comprising a steam turbine pipeline expansion tank drain recovery device, and,

[0024] The DOC controller is connected to a water seal module, the water seal module is connected to a steam-water separator and a pipeline expansion tank through a valve mechanism, and the steam-water separator is connected to a condenser.

[0025] As a preferred solution of the steam turbine pipeline expansion tank drain recovery system of the present invention, wherein: the valve mechanism includes a low vacuum quick-break valve module, which is arranged between the water seal module and the steam-water separator;

[0026] The water level regulating valve group module of the drain tank is connected to the water seal module and adjusts the water level of the water tank through DCS program control settings;

[0027] The sealing water quick-break valve module and the sealing water regulating valve group module are connected to the water seal module to ensure that the water seal module is in a slightly positive pressure state;

[0028] The drain to fixed discharge regulating valve module is connected to the drain tank water level regulating valve group module and the pipeline expansion tank, and is used to switch the drain discharge to the boiler periodic sewage expansion tank.

[0029] As a preferred solution of the steam turbine pipeline expansion tank drain recovery system of the present invention, wherein: the pipeline expansion tank is connected to a pressure sensor, and the pressure sensor is connected to a DOC controller.

[0030] The beneficial effects of the steam turbine pipeline expansion tank drain recovery system of the present invention: the system is suitable for an external condenser drain recovery system with a water seal device. The modular design allows users to select relevant modules according to actual on-site needs, reducing the amount of renovation and construction, improving the safety and reliability of the equipment, improving the level of automation, reducing personnel workload, and reducing enterprise costs. It can ensure the safe and stable operation of the main equipment and improve the economic benefits of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0032] Figure 1 This is the overall schematic diagram of the steam turbine pipeline expansion tank drain recovery device.

[0033] Figure 2 This is a schematic diagram of the fixed mechanism structure of the steam turbine pipeline expansion tank drain recovery device.

[0034] Figure 3 This is a schematic diagram of the structure of the limit assembly of the steam turbine pipeline expansion tank drain recovery device.

[0035] Figure 4 This is a schematic diagram of the extrusion component structure of the steam turbine pipeline expansion tank drain recovery device.

[0036] Figure 5 This is the overall flow chart of the steam turbine pipeline expansion tank drain recovery system. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0040] Example 1, reference Figure 1 to Figure 4 , is the first embodiment of the present invention, which provides a steam turbine pipeline expansion tank drain recovery device, including a pipeline expansion tank 100, a pressure sensor 200 is arranged on one side of the pipeline expansion tank 100, and the pressure sensor 200 is connected to the pipeline expansion tank 100 through a fixing mechanism 300, and the fixing mechanism 300 includes a mounting block 301 arranged on the pipeline expansion tank 100, and the mounting block 301 and the pipeline expansion tank 100 can be bonded or bolted, and a vertical groove 302 and a horizontal groove 303 are opened on the mounting block 301, and the vertical groove 302 and the horizontal groove 303 are connected, and the water A limiting assembly 304 for limiting the pressure sensor 200 is arranged inside the flat groove 303, and an extrusion assembly 305 for ensuring the sealing between the pressure sensor 200 and the pipeline expansion container 100 is arranged inside the vertical groove 302. By setting the limiting assembly 304, the pressure sensor 200 can be quickly installed. By setting the extrusion assembly 305, on the basis of the limiting assembly 304, the installation of the pressure sensor 200 is further optimized, so that the pressure sensor 200 and the mounting block 301 are tightly fitted, thereby ensuring the sealing of the pipeline expansion container 100 after the pressure sensor 200 is installed.

[0041] Furthermore, the limiting assembly 304 includes a telescopic rod 304a and a first spring 304b arranged inside the horizontal groove 303, the first spring 304b is sleeved on the surface of the telescopic rod 304a, the ends of the telescopic rod 304a and the first spring 304b away from the vertical groove 302 are connected to the inner wall of the horizontal groove 303, and the other ends of the telescopic rod 304a and the first spring 304b are connected to the first slider 304c, the first slider 304c is connected to a bracket 304d, and the bracket 304d is connected to a limiting plate 304e.

[0042] The arrangement of the telescopic rod 304a ensures the linear movement of the first slider 304c and the stable connection between the first slider 304c and the mounting block 301. Meanwhile, the arrangement of the telescopic rod 304a also ensures the linear stretching of the first spring 304b.

[0043] A round opening is provided on the mounting block 301, the round opening is communicated with the interior of the pipeline expansion container 100, and the round opening matches with the end of the pressure sensor 200;

[0044] In this embodiment, the limit plate 304e is fixedly connected to the bracket 304d, and in the initial state, one end of the limit plate 304e is located at the round opening of the mounting block 301;

[0045] When in use, first push the limit plate 304e, the limit plate 304e drives the first slider 304c to slide inside the horizontal groove 303 through the bracket 304d, and the first slider 304c drives the telescopic rod 304a and the first spring 304b to lengthen, so that the limit plate 304e is misaligned with the round mouth, and the end of the pressure sensor 200 is inserted into the pipeline expansion container 100 through the round mouth. After completion, release your hand, and under the elastic force of the first spring 304b, the first slider 304c is reset, and the first slider 304c drives the limit plate 304e to reset through the bracket 304d, so that the limit block limits the pressure sensor 200, thereby realizing the rapid installation of the pressure sensor 200.

[0046] Example 2, reference Figure 1 to Figure 4 , which is the second embodiment of the present invention. Different from the previous embodiment, the extrusion assembly 305 in this embodiment includes a second slider 305a arranged inside the vertical groove 302, and the second slider 305a is provided with a first inclined surface 305b, and the first slider 304c is provided with a second inclined surface 304c-1, and the first inclined surface 305b corresponds to the second inclined surface 304c-1.

[0047] Furthermore, the end of the limit plate 304e away from the pressure sensor 200 is connected to the force plate 304e-1, the end of the force plate 304e-1 is a semicircular arc surface, the first slider 304c is connected to the second spring 304e-2, and the end of the second spring 304e-2 away from the first slider 304c is connected to the limit plate 304e.

[0048] Furthermore, the extrusion assembly 305 also includes a column 305c connected to the second slider 305a, a third inclined surface 305d is provided on the column 305c, and a notch 305e is formed between the column 305c and the second slider 305a, and the surface of the notch 305e is a plane and corresponds to the first slider 304c.

[0049] Furthermore, a third slide groove 301a is provided on the mounting block 301, and a third slider 301b and a third spring 301c are arranged inside the third slide groove 301a, one end of the third slider 301b extends out of the third slide groove 301a and is connected to the second slider 305a, one end of the third spring 301c is connected to the inner wall of the third slide groove 301a, and the other end of the third spring 301c is connected to the third slider 301b. The setting of the third slide groove 301a and the third slider 301b ensures the connection between the second slider 305a and the mounting block 301, and at the same time, ensures the linear movement of the second slider 305a, so that the first inclined surface 305b on the second slider 305a is in contact with the second inclined surface 304c-1 on the first slider 304c.

[0050] Furthermore, the vertical groove 302 is divided into an upper groove and a lower groove with the horizontal groove 303 as the boundary, and the sizes of the upper groove and the lower groove match the second slider 305a, ensuring that when the second slider 305a moves to the lower groove, the lower groove at one end of the second slider 305a is away from the groove wall of the upper groove for extrusion contact.

[0051] The rest of the structure is the same as that of Example 1.

[0052] Different from the above embodiment, in this embodiment, in the initial state, the stopper is misaligned with the round opening, and the stopper is rotatably connected to the bracket 304d. At the same time, the end of the first slider 304c away from the first spring 304b abuts against the side wall of the vertical groove 302, and the first slider 304c cooperates with the first slide groove and the third spring 301c to support the second slider 305a.

[0053] When in use, by pushing down the column 305c, the column 305c drives the second slider 305a from the upper groove into the lower groove. When the second slider 305a moves, the second slider 305a drives the third slider 301b to move, and the third slider 301b drives the third spring 301c to stretch. At the same time, the first inclined surface 305b on the second slider 305a contacts the third inclined surface 305d on the first slider 304c, driving the first slider 304c to move toward the direction of the pressure sensor 200, and the first slider 304c squeezes the first spring 304b, causing the first spring 304b to contract. When the second slider 305a completely enters the lower groove, at this time, the first spring 304b. The first slider 304c is reset, and the first slider 304c drives the limit plate 304e to approach the position of the column 305c through the bracket 304d. The limit plate 304e drives one end of the force plate 304e-1 to contact the third inclined surface 305d on the column 305c, so that the limit plate 304e rotates with the connection with the bracket 304d as the center, and then the end of the limit plate 304e away from the force plate 304e-1 contacts the surface of the pressure sensor 200, so that the pressure sensor 200 and the mounting block 301 are closely fitted. At the same time, the limit block drives the second spring 304e-2 to lengthen, and the end of the first slider 304c away from the first spring 304b contacts the two sides of the notch 305e, and the first slider 304c cooperates with the first slide groove to limit the second slider 305a;

[0054] When contact locking is required, it is only necessary to push the limit plate 304e in the direction of the pressure sensor 200 so that the first slider 304c disengages from the notch 305e. At this time, under the elastic force of the third spring 301c, the second slider 305a is reset. After releasing your hand, under the elastic force of the first spring 304b and the second spring 304e-2, the first slider 304c and the limit block are reset, so that the limit block is misaligned with the pressure sensor 200, thereby achieving quick unlocking.

[0055] Example 3, reference Figure 5 , which is the third embodiment of the present invention, is different from the previous embodiment in that this embodiment provides a steam turbine pipeline expansion tank drain recovery system, including the steam turbine pipeline expansion tank drain recovery device in the above embodiment, which includes,

[0056] The DOC controller is connected to a water seal module, which is connected to a steam-water separator and a pipeline expansion container 100 through a valve mechanism, and the steam-water separator is connected to a condenser.

[0057] Further, the valve mechanism includes a low vacuum quick-break valve module, which is arranged between the water seal module and the steam-water separator;

[0058] The water level regulating valve group module of the drain tank is connected to the water seal module and adjusts the water level of the water tank through DCS program control settings;

[0059] The sealing water quick-break valve module and the sealing water regulating valve group module are connected to the water seal module to ensure that the water seal module is in a slightly positive pressure state;

[0060] The drain to fixed discharge regulating valve module is connected to the drain tank water level regulating valve group module and the pipeline expansion tank 100, and is used to switch the drain discharge to the boiler periodic sewage expansion tank.

[0061] Furthermore, a pressure sensor 200 is connected to the pipeline expansion tank 100 , and the pressure sensor 200 is connected to the DOC controller.

[0062] The manual valves related to normal operation are opened, the low vacuum quick-break valve module is opened, the drain tank water level regulating valve group module is set to adjust the water level of the water tank through the DCS controller input instructions, the sealing water quick-break valve module is opened, the sealing water regulating valve group module is set to ensure the micro-positive pressure state of the water seal device through the DCS controller input instructions, and the drain to fixed discharge regulating valve module is closed for standby.

[0063] When flushing the drain pipe / drain tank, the drain tank water level regulating valve group module and the drain to fixed discharge regulating valve module are in automatic state. According to user needs, the flushing function can be achieved by setting the drain tank water level separately or by adjusting the valve opening in manual state.

[0064] When the vacuum of the steam turbine unit is abnormal / the pressure of the sealing water supply main pipe is abnormal / the pipeline expansion tank 100 system is abnormal, this module system still inputs instructions through the DCS controller to quickly close the low vacuum quick-break valve module, close the drain tank water level regulating valve group module, open the drain to fixed discharge regulating valve module, switch the drain discharge to the boiler discharge, stop discharging to the condenser, and control the sealing water quick-break valve module and the sealing water regulating valve group module according to the signal received from the pressure sensor 200 by the DCS controller program to ensure the micro-positive pressure state of the water seal device.

[0065] The system modification is simple, and the purpose can be achieved by slightly modifying the original module. The protection action is fast, the DCS controller realizes program control, and can be operated locally / remotely. The operation is simple, the system safety is significantly improved, the number of personnel operations is reduced, and the automation level is improved. Improve the safety and reliability of equipment operation

[0066] In summary, this system is suitable for an external condenser drain recovery system with a water seal device. The modular design allows users to select relevant modules according to actual on-site needs, reducing the amount of renovation and construction, improving the safety and reliability of equipment, improving the level of automation, reducing personnel workload, and reducing enterprise costs. It can ensure the safe and stable operation of the main equipment and improve the economic benefits of the enterprise.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A steam turbine pipeline expansion tank drain recovery device, characterized in that: include, Pipeline expansion vessel (100); A pressure sensor (200) is arranged on one side of the pipeline expansion tank (100); A fixing mechanism (300), comprising a mounting block (301) arranged on the pipeline expansion container (100), the mounting block (301) being provided with a vertical groove (302) and a horizontal groove (303), a limiting assembly (304) for limiting the position of the pressure sensor (200) being arranged inside the horizontal groove (303), and an extrusion assembly (305) for ensuring sealing between the pressure sensor (200) and the pipeline expansion container (100) being arranged inside the vertical groove (302); The vertical groove (302) is communicated with the horizontal groove (303).

2. The steam turbine pipeline expansion tank drain recovery device according to claim 1, characterized in that: The limiting assembly (304) comprises a telescopic rod (304a) and a first spring (304b) which are arranged inside the horizontal groove (303); the first spring (304b) is sleeved on the surface of the telescopic rod (304a); one end of the telescopic rod (304a) and the first spring (304b) away from the vertical groove (302) are connected to the inner wall of the horizontal groove (303); and the other ends of the telescopic rod (304a) and the first spring (304b) are connected to a first slider (304c); the first slider (304c) is connected to a bracket (304d); and the bracket (304d) is connected to a limiting plate (304e).

3. The steam turbine pipeline expansion tank drain recovery device according to claim 2, characterized in that: The extrusion assembly (305) comprises a second sliding block (305a) arranged inside the vertical groove (302), and the second sliding block (305a) is provided with a first inclined surface (305b); The first sliding block (304c) is provided with a second inclined surface (304c-1); The first inclined surface (305b) corresponds to the second inclined surface (304c-1).

4. The steam turbine pipeline expansion tank drain recovery device according to claim 3, characterized in that: One end of the limit plate (304e) away from the pressure sensor (200) is connected to a force plate (304e-1), the end of the force plate (304e-1) is a semicircular arc surface, the first slider (304c) is connected to a second spring (304e-2), and one end of the second spring (304e-2) away from the first slider (304c) is connected to the limit plate (304e).

5. The steam turbine pipeline expansion tank drain recovery device according to claim 4, characterized in that: The extrusion assembly (305) further comprises a column (305c) connected to the second slider (305a), a third inclined surface (305d) is arranged on the column (305c), and a gap (305e) is formed between the column (305c) and the second slider (305a).

6. The steam turbine pipeline expansion tank drain recovery device according to claim 5, characterized in that: The mounting block (301) is provided with a third slide groove (301a), and a third slider (301b) and a third spring (301c) are arranged inside the third slide groove (301a); one end of the third slider (301b) extends out of the third slide groove (301a) and is connected to the second slider (305a); one end of the third spring (301c) is connected to the inner wall of the third slide groove (301a), and the other end of the third spring (301c) is connected to the third slider (301b).

7. The steam turbine pipeline expansion tank drain recovery device according to claim 6, characterized in that: The vertical groove (302) is divided into an upper groove and a lower groove with the horizontal groove (303) as the boundary, and the sizes of the upper groove and the lower groove are matched with the second sliding block (305a).

8. A steam turbine pipeline expansion tank drain recovery system, characterized by: The invention comprises the steam turbine pipeline expansion tank drain recovery device according to any one of claims 1 to 7, and A DOC controller is connected to a water seal module, wherein the water seal module is connected to a steam-water separator and a pipeline expansion container (100) via a valve mechanism, and the steam-water separator is connected to a condenser.

9. The steam turbine pipeline expansion tank drain recovery system according to claim 8, characterized in that: The valve mechanism includes a low vacuum quick-break valve module, which is arranged between the water seal module and the steam-water separator; The water level regulating valve group module of the drain tank is connected to the water seal module and adjusts the water level of the water tank through DCS program control settings; The sealing water quick-break valve module and the sealing water regulating valve group module are connected to the water seal module to ensure that the water seal module is in a slightly positive pressure state; The drain-to-fixed-discharge regulating valve module is connected to the drain tank water level regulating valve group module and the pipeline expansion tank (100) and is used to switch the drain discharge to the boiler periodic blowdown expansion tank.

10. The steam turbine pipeline expansion tank drain recovery system according to claim 9, characterized in that: The pipeline expansion tank (100) is connected to a pressure sensor (200), and the pressure sensor (200) is connected to a DOC controller.

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