Continuous exhaust steam-liquid two-phase flow throttling device of power plant boiler

Abstract

The utility model discloses a continuous exhaust vapor-liquid two-phase flow throttling device of a power plant boiler, which relates to the technical field of vapor-liquid two-phase throttling and comprises a throttling component and device seats, the left end and the right end of the throttling component are connected with the device seats, sealing rings are arranged at the butt joint positions of the device seats, and pressure tapping pipes are mounted at the tops of the middle sections of the device seats. Fastening bolts are arranged on the periphery of the outer side of the device base in an annular array mode with the device base as the circle center. According to the continuous exhaust steam-liquid two-phase flow throttling device for the power plant boiler, the butt joint groove and the limiting ring are arranged, and the device base provided with the limiting groove and the sealing ring are used in a matched mode, so that on one hand, the stability and accuracy during butt joint of the throttling assembly and the device base structure can be guaranteed, and the possibility of leakage caused by structural deviation is prevented; on the other hand, sufficient structural sealing performance can be guaranteed to the maximum extent after the structures are in butt joint, the stability and safety of fluid conveying in the device are guaranteed, and meanwhile the whole device can be flexibly disassembled and assembled through the structure so that equipment maintenance can be facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of gas-liquid two-phase throttling, in particular to a steam-liquid two-phase flow throttling device for a power plant boiler. Background Art

[0002] Boiler tandem means that under certain installation conditions, the flue gas pipes of multiple boilers are connected into a group of pipes to discharge the exhaust gas in a centralized manner, thereby achieving the purpose of improving utilization efficiency. Boiler tandem is a technology that optimizes the layout of flue gas pipes. It improves the utilization efficiency of boilers and reduces environmental pollution by recycling exhaust gas while ensuring the normal operation of boilers.

[0003] There are several connecting pipelines in the row arrangement, among which the throttling device is a flow device when the fluid that fills the pipeline flows through the pipeline. When the continuous fluid medium moves in the pipeline and flows through the throttling device preset in the pipeline, its flow beam will form a local reduction in diameter at the throttling device, thereby increasing the flow velocity of the fluid medium and reducing the hydrostatic pressure relatively. This situation will cause a pressure drop (pressure difference) upstream and downstream of the throttling device (orifice plate). The larger the flow rate of the flowing medium, the greater the pressure difference generated upstream and downstream of the throttling device;

[0004] Therefore, the pressure difference of the throttling measuring device can be used to relatively measure the size of the fluid flow through the throttling device through a certain conversion, so that the throttling device can be used to specifically measure the flow rate of the continuous flowing medium in the pipeline.

[0005] Conventional throttling devices have throttling components that are either integrated, which is inconvenient to operate internally and relatively costly to maintain, or are clamped and fixed by flange structures on both sides of the pipes. This structure makes the accuracy and stability of the structural docking depend on the meticulousness of the operator's operation, which may result in structural deviation or even pipeline leakage.

[0006] Therefore, in view of this, the existing structure and defects are studied and improved, and a power plant boiler exhaust steam-liquid two-phase flow throttling device is proposed. Utility Model Content

[0007] The utility model aims to provide a steam-liquid two-phase flow throttling device for a power plant boiler exhaust, so as to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a power plant boiler exhaust steam-liquid two-phase flow throttling device, comprising a throttling assembly and a device seat, the left and right ends of the throttling assembly are connected to the device seats, and sealing rings are provided at the joints between the device seats, and a pressure taking pipe is installed on the top of the middle section of the device seat, and fastening bolts are arranged in a circular array around the outer side of the device seat with the device seat itself as the center, the throttling assembly comprises a throttling device body, a fixing ring, a docking groove and a limit ring, one end of the throttling device body is connected to the fixing ring, and a docking groove is provided in the center of the edge of the fixing ring, and the left and right sides of the fixing ring are connected to the limit ring.

[0009] Furthermore, the throttling device body is arranged in a long-neck nozzle-type structure, and the fixing ring is fixedly connected to the surface of one end of the large opening of the throttling device body.

[0010] Furthermore, the fixing ring, the limiting ring and the throttling device body are all located on the same horizontal central axis, and the throttling device body, the fixing ring and the limiting ring are arranged in an integrated structure.

[0011] Furthermore, the device seat includes a connecting pipe, a pressure-taking flange and a limiting groove. The left and right ends of the connecting pipe are provided with pressure-taking flanges, and a limiting groove is provided on a surface of one side of the pressure-taking flange close to the sealing ring.

[0012] Furthermore, the limiting groove is provided on a side surface of the pressure-taking flange close to the limiting ring, and the inner surface structure of the limiting groove matches the outer surface structure of the limiting ring.

[0013] Furthermore, the sealing ring includes an outer ring body, an inner ring body and a fixing hole. The inner diameter surface of the outer ring body is connected to the inner ring body, and the fixing hole is opened on the side surface of the outer ring body.

[0014] Furthermore, the outer surface structure of the inner ring body matches the inner surface structure of the docking groove, and the outer ring body and the inner ring body form an integral structure, and the fixing holes are arranged in a circular array with the horizontal central axis of the outer ring body as the center.

[0015] Furthermore, the pressure taking pipe includes a main body, a rotary valve and a quick connector. A rotary valve is installed on the top of the main body, and the top of the rotary valve is connected to a quick connector. The main body extends to the top of the connecting pipe, and the main body and the connecting pipe are welded.

[0016] The utility model provides a steam-liquid two-phase flow throttling device for a power plant boiler, which has the following beneficial effects:

[0017] 1. The utility model relates to a fixing ring connected to one end of the large opening of the throttling device body, so that the entire throttling assembly can utilize the pressure-taking flange at one end of the connecting pipe to connect the throttling assembly and the device seat in a left and right clamping manner, and by symmetrically arranging limit rings on the surfaces of the left and right sides of the fixing ring, and at the same time, a limit groove matching the limit ring structure is opened on the surface of the pressure-taking flange at one end of the connecting pipe close to the fixing ring, so that when the left and right groups of device seats are connected to the central throttling assembly, the limit rings on both sides of the fixing ring are respectively engaged with the limit grooves on the surfaces of the contacting pressure-taking flanges on the left and right sides. By using the above structure, on the one hand, the stability of the structure after the throttling assembly and the device seat structure are connected can be ensured to the greatest extent, and on the other hand, the possibility of misalignment and offset after the throttling assembly and the device seat structure are effectively avoided, thereby ensuring the accuracy of the structural connection, and at the same time, the use of the above structure can also achieve a certain degree of structural sealing to prevent the problem of structural leakage.

[0018] 2. The utility model provides a docking groove on the edge surface of the fixing ring and cooperates with the use of a sealing ring. Before the throttling assembly and the device seat structure are docked, the inner ring body connected to the inner diameter of the outer ring body is first embedded in the docking groove. Then, when the device seat is horizontally docked at the left and right ends of the throttling assembly, the fixing hole is aligned with the hole of the pressure flange, and then a fastening bolt is used to horizontally penetrate therethrough to complete the structural fixation. By using the above structure, a structural seal can be further provided for the connection between the throttling assembly and the device seat to prevent leakage. On the other hand, the use of the sealing ring can effectively protect the structure of the connection between the throttling assembly and the device seat to prevent unnecessary influences caused by external factors. In addition, the disassembly of the above structure provides a flexible and convenient operation method for the maintenance of the throttling device body. At the same time, the split structure between the throttling assembly and the device seat effectively controls the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the cross-sectional structure of the main body of a power plant boiler exhaust steam-liquid two-phase flow throttling device according to the utility model;

[0020] Figure 2 It is a three-dimensional structural schematic diagram of a throttling assembly of a steam-liquid two-phase flow throttling device for a power plant boiler exhaust according to the utility model;

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of a device seat and a pressure-taking pipe of a power plant boiler exhaust steam-liquid two-phase flow throttling device according to the utility model;

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of a sealing ring of a steam-liquid two-phase flow throttling device for a power plant boiler exhaust according to the utility model;

[0023] Figure 5 The utility model is a schematic diagram of the three-dimensional structure of the main body of a power plant boiler exhaust steam-liquid two-phase flow throttling device.

[0024] In the figure: 1. throttling assembly; 101. throttling device body; 102. fixing ring; 103. docking groove; 104. limiting ring; 2. device seat; 201. connecting pipe; 202. pressure taking flange; 203. limiting groove; 3. sealing ring; 301. outer ring body; 302. inner ring body; 303. fixing hole; 4. pressure taking pipe; 401. main pipe body; 402. rotary valve; 403. quick connector; 5. fastening bolts. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0026] like Figures 1 to 5 As shown, a steam-liquid two-phase flow throttling device for a power plant boiler comprises a throttling assembly 1 and a device seat 2. The left and right ends of the throttling assembly 1 are connected to the device seats 2, and sealing rings 3 are arranged at the joints of the device seats 2. A pressure-taking pipe 4 is installed on the top of the middle section of the device seat 2, and a fastening bolt 5 is arranged in a circular array around the outer side of the device seat 2 with the device seat 2 itself as the center. The throttling assembly 1 comprises a throttling device body 101, a fixing ring 102, a docking groove 103 and a limiting ring 104. One end of the throttling device body 101 is connected to the fixing ring 102, and a docking groove 103 is provided in the center of the edge of the fixing ring 102, and the limiting rings 104 are connected to the left and right sides of the fixing ring 102. The throttling device body 101 adopts a long-neck nozzle structure, and the fixing ring 102 is fixedly connected to On the surface of the wide opening end of the throttling device body 101, the fixing ring 102, the limiting ring 104 and the throttling device body 101 are all on the same horizontal central axis, and the throttling device body 101, the fixing ring 102 and the limiting ring 104 are arranged in an integrated structure with each other. The limiting rings 104 are symmetrically arranged on the surfaces of the left and right sides of the fixing ring 102, and a limiting groove 203 matching the structure of the limiting ring 104 is opened on the surface of the pressure-taking flange 202 at one end of the connecting pipe 201 close to the fixing ring 102. When the left and right groups of device seats 2 are docked with the central throttling assembly 1, the limiting rings 104 on both sides of the fixing ring 102 are respectively fitted into the limiting grooves 203 on the surfaces of the contacting pressure-taking flanges 202 on the left and right sides, thereby realizing a fast and stable connection structure.

[0027] like Figures 1 to 5As shown, the device seat 2 includes a connecting pipe 201, a pressure-taking flange 202 and a limiting groove 203. The left and right ends of the connecting pipe 201 are provided with pressure-taking flanges 202, and a limiting groove 203 is provided on a side surface of the pressure-taking flange 202 close to the sealing ring 3. The limiting groove 203 is provided on a side surface of the pressure-taking flange 202 close to the limiting ring 104, and the inner surface structure of the limiting groove 203 matches the outer surface structure of the limiting ring 104. The sealing ring 3 includes an outer ring body 301, an inner ring body 302 and a fixing hole 303. The inner diameter surface of the outer ring body 301 is connected to the inner ring body 302, and the side surface of the outer ring body 301 is provided with a fixing hole 303. The outer surface structure of the inner ring body 302 matches the inner surface structure of the docking groove 103, and the outer ring body 301 and the inner ring body 302 are integrally connected. The structure is as follows: the fixing holes 303 are arranged in an annular array with the horizontal central axis of the outer ring body 301 as the center. The pressure taking pipe 4 includes a main body 401, a rotary valve 402 and a quick connector 403. The top of the main body 401 is equipped with a rotary valve 402, and the top of the rotary valve 402 is connected with a quick connector 403. The main body 401 extends to the top of the connecting pipe 201, and the main body 401 and the connecting pipe 201 are welded. Before the throttling assembly 1 and the device seat 2 are structurally docked, the inner ring body 302 connected to the inner diameter of the outer ring body 301 is first embedded in the docking groove 103. Then, when the device seat 2 is horizontally docked at the left and right ends of the throttling assembly 1, the fixing hole 303 is aligned with the hole of the pressure taking flange 202, and then the fastening bolts 5 are used to horizontally penetrate therethrough to complete the structural fixation.

[0028] In summary, if Figures 1 to 5 As shown, the steam-liquid two-phase flow throttling device for the power plant boiler exhaust is used by firstly sleeve-fitting and fitting the inner ring body 302 connected to the inner diameter of the outer ring body 301 into the docking groove 103 provided on the side of the fixing ring 102, so that the sealing ring 3 and the throttling assembly 1 are tightly docked;

[0029] Then, the throttling assembly 1 with the sealing ring 3 is placed in the middle of the device seats 2 which are arranged opposite to each other on the left and right sides. At this time, the fastening bolts 5 play the role of horizontal sliding guide. As the left and right device seats 2 approach the central throttling assembly 1, the limiting rings 104 on the left and right sides of the fixing ring 102 are respectively inserted in the horizontal direction with the pressure-taking flanges 202 on one end of the left and right connecting pipes 201 close to the throttling assembly 1 through the limiting grooves 203 on the surface thereof, so that the throttling body 101 is located in the center of the left and right connecting pipes 201, and the entire throttling assembly 1 is fastened and fitted with the device seat 2;

[0030] At the same time, by rotating the throttling component 1, the fixing hole 303 opened on the surface of the outer ring body 301 is structurally aligned with the pressure-taking flanges 202 on both sides, and then the pipelines at both ends are connected using the pressure-taking flange 202 at the other end of the connecting pipe 201. Subsequently, the fastening bolts 5 are used to pass through the device seat 2 and the sealing ring 3 in the horizontal direction and tighten them, so that the entire device is fixed in the pipeline. After that, the pressure-taking pipe 4 connected to the top of the device seat 2 and the quick connector 403 on the top of the rotary valve 402 are used to connect the entire device to the flowmeter, and the rotary valve 402 at the upper end of the main body 401 is opened.

[0031] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A steam-liquid two-phase flow throttling device for a power plant boiler, comprising a throttling assembly (1) and a device seat (2), characterized in that: The left and right ends of the throttling assembly (1) are both connected to a device seat (2), and a sealing ring (3) is provided at the joint of the device seats (2), and a pressure-taking pipe (4) is installed at the top of the middle section of the device seat (2), and a fastening bolt (5) is arranged in a circular array around the outer side of the device seat (2) with the device seat (2) itself as the center. The throttling assembly (1) comprises a throttling device body (101), a fixing ring (102), a docking groove (103) and a limiting ring (104), one end of the throttling device body (101) is connected to the fixing ring (102), and a docking groove (103) is provided at the center of the edge of the fixing ring (102), and the limiting ring (104) is connected to the left and right sides of the fixing ring (102).

2. A steam-liquid two-phase flow throttling device for a power plant boiler exhaust according to claim 1, characterized in that: The throttling element body (101) is arranged in a long-neck nozzle-type structure, and the fixing ring (102) is fixedly connected to the surface of one end of the throttling element body (101) with a large opening.

3. The steam-liquid two-phase flow throttling device for a power plant boiler exhaust according to claim 1 is characterized in that: The fixing ring (102), the limiting ring (104) and the throttling device body (101) are all located on the same horizontal central axis, and the throttling device body (101), the fixing ring (102) and the limiting ring (104) are arranged in an integral structure with each other.

4. The steam-liquid two-phase flow throttling device for a power plant boiler exhaust according to claim 1 is characterized in that: The device seat (2) comprises a connecting pipe (201), a pressure-taking flange (202) and a limiting groove (203); the left and right ends of the connecting pipe (201) are both provided with a pressure-taking flange (202), and a limiting groove (203) is provided on a surface of one side of the pressure-taking flange (202) close to the sealing ring (3).

5. A steam-liquid two-phase flow throttling device for a power plant boiler exhaust according to claim 4, characterized in that: The limiting groove (203) is provided on a side surface of the pressure-taking flange (202) close to the limiting ring (104), and the inner surface structure of the limiting groove (203) matches the outer surface structure of the limiting ring (104).

6. The steam-liquid two-phase flow throttling device for a power plant boiler exhaust according to claim 1 is characterized in that: The sealing ring (3) comprises an outer ring body (301), an inner ring body (302) and a fixing hole (303); the inner diameter surface of the outer ring body (301) is connected to the inner ring body (302), and the fixing hole (303) is provided on the side surface of the outer ring body (301).

7. A steam-liquid two-phase flow throttling device for a power plant boiler exhaust according to claim 6, characterized in that: The outer surface structure of the inner ring body (302) matches the inner surface structure of the docking groove (103), and the outer ring body (301) and the inner ring body (302) form an integral structure, and the fixing holes (303) are arranged in a circular array with the horizontal central axis of the outer ring body (301) as the center.

8. The steam-liquid two-phase flow throttling device for a power plant boiler exhaust according to claim 4 is characterized in that: The pressure-taking pipe (4) comprises a main pipe body (401), a rotary valve (402) and a quick connector (403); the top of the main pipe body (401) is provided with a rotary valve (402), and the top of the rotary valve (402) is connected with a quick connector (403); the main pipe body (401) extends to the top of the connecting pipe (201), and the main pipe body (401) and the connecting pipe (201) are connected by welding.

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