CN115789385A - Use method of device for preventing flow accelerated corrosion of pressure-bearing member - Google Patents
Use method of device for preventing flow accelerated corrosion of pressure-bearing member Download PDFInfo
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- CN115789385A CN115789385A CN202211561109.3A CN202211561109A CN115789385A CN 115789385 A CN115789385 A CN 115789385A CN 202211561109 A CN202211561109 A CN 202211561109A CN 115789385 A CN115789385 A CN 115789385A
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Abstract
The invention relates to a use method of a device for preventing flow accelerated corrosion of a pressure-bearing member, and belongs to the field of flow accelerated corrosion of the pressure-bearing member of a thermal power generating unit. The invention selects the device corresponding to the material and specification according to the pipe diameter of the pipeline; performing groove processing on two ends of the device, wherein the groove can be set to be V-shaped or U-shaped and is connected with an original pipeline, and the connection form is argon arc welding or argon electric union welding; the thinning condition of the back end part is periodically checked during the operation of the unit. The invention has the advantages of reasonable design, safety, reliability, convenient operation and adjustment and strong universality, can be suitable for different pipelines, greatly prolongs the service life of the pressure-bearing component and meets the use requirements.
Description
Technical Field
The invention relates to a using method of a device, in particular to a using method of a device for preventing flow accelerated corrosion of a pressure-bearing member, and belongs to the field of flow accelerated corrosion of the pressure-bearing member of a thermal power generating unit.
Background
In recent years, new energy power is greatly improved, and meanwhile, the requirement on the operation adjustability of a coal-electric unit is higher, so that the reliability standard of the operation safety of a pressure-bearing component of a thermal power unit is improved, and a new challenge is provided for the safe operation of a pressure-bearing pipeline in a power system in the face of frequent starting and stopping of the thermal power unit.
The flow accelerated corrosion phenomenon is a phenomenon that the metal protection oxide film is accelerated to dissolve because fluid flows under certain temperature and pressure. In the in-service operation boiler and steam turbine room of the thermal power generating unit, a plurality of pipelines are arranged, particularly in the elbows, reducing diameters and tee joints of temperature-reducing water pipelines and drain pipelines, the hydraulic cavitation phenomenon can occur due to the existence of two-phase flow and the change of the flow velocity of fluid, and the reduction and falling of an oxide film on the inner wall of the pipeline are caused, so that the pipe wall is thinned, and the safety operation of the pipeline is seriously and potentially threatened. Hydrodynamic cavitation refers to the state of artificially creating low pressure and high flow rate at a certain position of a pipeline through which liquid passes, when the pressure of the liquid is less than saturated vapor pressure, bubbles in the liquid are expanded continuously, the volume of the bubbles is increased, and along with the movement of the fluid, the bubbles collapse and burst after reaching a high-pressure and low-flow rate area, and impact the inner wall of the pipeline adjacent to the bubbles.
The publication date is 2019, 02, 12 and the publication number is CN208482406U, which discloses a utility model named as a hydrodynamic cavitation fluid device for efficiently boosting the collapse of cavitation bubbles. The device comprises a shell component, a cavitation component and a boosting component, wherein the boosting component comprises a pore plate, a first target disc, a combined bin and a vortex bin, the pore plate penetrates through a choking pipe fixing plate and is close to the right side of a nozzle, the pore plate is fixedly connected with the choking pipe fixing plate, and the first target disc is positioned on the left side inside the choking pipe and is close to the right side of the pore plate; through setting up the combination storehouse, vortex storehouse and diapire combination are used, make the fluid assemble and be spiral flow, assemble minor diameter cavitation bubble, strike with the diapire, make minor diameter cavitation bubble be explaimed in a large number, further promote the cavitation of choking the cavitation ware and explain the effect, through setting up the orifice plate, utilize the area difference of overflowing, make cavitation bubble tentatively explain, can be nimble changeable in the redesign, can produce the cavitation bubble at great water within range, make things convenient for the follow-up operation of explaiing of choking the ring, but can not the effectual turbulent flow in the elimination pipeline, can't realize the protection to the pipeline inner wall, so it still has above-mentioned defect.
In view of the above, it would be desirable to provide an apparatus and method for preventing flow-accelerated corrosion of a pressure bearing member.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the use method of the device for preventing the accelerated corrosion of the flowing pressure-bearing member, which has the advantages of reasonable design, safety, reliability, convenience in operation and adjustment, strong universality, suitability for different pipelines and capability of greatly prolonging the service life of the pressure-bearing member.
The technical scheme adopted by the invention for solving the problems is as follows: the use method of the device for preventing the flow accelerated corrosion of the pressure-bearing member comprises a hydraulic cavitation eliminating device, wherein the hydraulic cavitation eliminating device comprises a tubular shell, a spindle body, a cylinder and a ring body in a fixing clamping piece, the ring body is welded on the spindle body, one end of the cylinder is welded with the ring body after penetrating through the tubular shell in the fixing clamping piece, and the other end of the cylinder is welded with the tubular shell, and the hydraulic cavitation eliminating device is characterized in that: the method comprises the following specific steps:
(S1): selecting a device corresponding to the material and specification according to the pipe diameter of the pipeline;
(S2): performing groove processing on two ends of the device, wherein the groove can be set to be V-shaped or U-shaped and is connected with an original pipeline, and the connection form is argon arc welding or argon electric union welding;
(S3): and regularly checking the thinning condition of the back end part in the operation of the unit.
Preferably, the inner wall of the tubular shell is provided with ribs which are spirally arranged along the axial direction, the cross section of the internal thread is a concave curved surface triangle, the ribs which are spirally arranged are distributed at equal intervals, and the number of heads is controlled within the range of 3-8; the included angle between the spiral direction and the cross section is controlled within the range of 30-60 degrees; the circumferential bottom width of the fins is controlled within the range of 2-6 mm; the height of the highest point of the rib is controlled within the range of 0.5-1.5mm, and the position of the highest point of the rib is at the position of 1/2 of the width of the bottom of the rib.
Preferably, ribs are arranged in a spiral shape in the axial direction of the spindle surface of the spindle body, the specification and the arrangement form of the ribs are consistent with those of the tubular shell, and the length of one axial end of the spindle body is twice larger than the diameter of the tubular shell.
Compared with the prior art, the invention has the following advantages and effects: (1) The whole design is reasonable, safe and reliable, convenient operation can carry out erosion and thinning to the pressure-bearing member that is easily corroded with higher speed by the flow and prevent and protect, slows down the attenuate trend of part. (2) The device is simple in operation, safe and reliable in use, convenient in operation and adjustment, strong in universality, and capable of being suitable for different pipelines, and the service life of the pressure-bearing component is greatly prolonged.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for eliminating hydrodynamic cavitation in an embodiment of the present invention.
FIG. 2 is a schematic diagram of the operation of the device (reducer pipe) for eliminating hydrodynamic cavitation in the embodiment of the invention.
In the figure: the pipe fitting comprises a pipe fitting shell 1, a spindle body 2, a cylinder 3 in a fixed clamping piece and a ring body 4.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples
Referring to fig. 1 to 2, the apparatus and the method for preventing flow accelerated corrosion of a pressure-bearing member according to the present embodiment are based on the principle that flow rate variation in a piping system can be mitigated by reducing the occurrence of hydrodynamic cavitation, thereby preventing flow accelerated corrosion of the inner wall of a pipeline; the structure mainly comprises ribs which are spirally arranged, and is realized by providing a device for eliminating hydrodynamic cavitation and improving the structure of the inner wall of the pressure-bearing part.
The hydrodynamic cavitation eliminating device in the embodiment comprises a pipe-mounted shell 1, a spindle body 2, a cylinder 3 in a fixed clamping piece and a ring body 4, and the specific structure is as shown in figure 1:
the pipe casing 1 in the embodiment can adopt pipe fittings made of materials such as 15CrMoG, 12Cr1MoVG, SA335-P91 and the like, and can be combined with a fixed clamping piece; the specification can be selected from various specifications such as phi 51mm, phi 76mm, phi 108mm, phi 133mm and the like; the inner wall of the tubular shell is axially provided with ribs which are spirally arranged, the section of an internal thread is a concave curved surface triangle, the ribs which are spirally arranged are distributed at equal intervals, and the number of heads is controlled within the range of 3-8 heads; the included angle between the spiral direction and the cross section is controlled within the range of 30-60 degrees; the circumferential bottom width of the fins is controlled within the range of 2-6 mm; the height of the highest point of the rib is controlled within the range of 0.5-1.5mm, and the position of the highest point of the rib is at the position of 1/2 of the width of the bottom of the rib; the shell of the tube seat is provided with 4 round holes matched with the cylinder 3 in the fixed clamping piece, and the size specification of the round holes is generally set to be 6-10mm.
The spindle body 2 in the embodiment can be a solid forging made of materials such as 15CrMo, 12Cr1MoV and SA336F91, and can be combined with a fixed clamping piece; the maximum diameter part is less than 10mm-25mm than the tubular shell; ribs which are spirally arranged are axially arranged on the spindle surface of the spindle body 2, and the specifications of the ribs can be consistent with the arrangement form of the ribs and the tubular shell 1; the length of one axial end of the spindle body 2 is more than one time longer than the diameter of the tubular housing 1.
The fixing clamping piece in the embodiment is composed of a cylinder 3 and a torus 4, wherein the cylinder 3 and the torus 4 are 6-12 mm in diameter, the four fixing clamping pieces are made of 15CrMoG and 12Cr1MoVG, and the specification is 6-10mm. The circular ring body 4 is welded on the spindle body 2, after the cylinder 3 in the fixing clamping piece penetrates through the tubular shell 1, one end of the cylinder is welded with the circular ring body 4, and the other end of the cylinder is welded with the tubular shell 1; the function of the device is to fix the tubular shell 1 and the spindle 2 and to make the axis of the spindle 2 coincide with the axis of the tubular shell 1.
The pressure-bearing member of the embodiment improves the structure of the inner wall, and can be processed into the fins which are spirally arranged along the axial direction of the inner wall at the positions of elbows, reducer pipes and tee joints, wherein the inner walls of the fins which are spirally arranged have the sections of concave curved triangles, the fins which are spirally arranged are distributed at equal intervals, and the number of heads is controlled within the range of 3-8 heads; the included angle between the streamline direction and the cross section is controlled within the range of 30-60 degrees; the circumferential bottom width of the fins is controlled within the range of 2-6 mm; the height of the highest point of the rib is controlled within the range of 0.5-1.5mm, and the position of the highest point of the rib is at the position of 1/2 of the width of the bottom of the rib.
The present embodiment eliminates the tube device shell 1, the spindle body 2 and the improved inner wall of the pressure bearing member in the hydraulic cavitation device, and the ribs which are arranged spirally are arranged on the inner wall of the pressure bearing member, and the structure can effectively eliminate the turbulent flow in the pipeline, thereby realizing the protection of the inner wall of the pipeline.
The device can be arranged at the front end of a pressure-bearing member which is easily affected by turbulent flow, such as a pipeline elbow, a reducer pipe and the like, and the installation mode adopts a welding mode.
The use method of the device for preventing the flow accelerated corrosion of the pressure bearing member comprises the following steps: (1) Selecting a device corresponding to the material and specification according to the pipe diameter of the pipeline; (2) Performing groove processing on two ends of the device, wherein the groove can be set to be V-shaped or U-shaped and is connected with an original pipeline, and the connection form is argon arc welding or argon electric union welding; (3) And regularly checking the thinning condition of the back end part in the operation of the unit.
The device (reducer pipe) for eliminating the hydrodynamic cavitation phenomenon in the embodiment is a schematic operation and use diagram, can be applied to the rear ends of reducer pipes in a desuperheating water and drain pipe system, can prevent and protect the reducer pipes which are easy to flow accelerated corrosion from erosion and thinning, and can slow down the thinning tendency of components.
And will be apparent to those skilled in the art from the foregoing description.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may occur to those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (3)
1. The use method of the device for preventing the flow accelerated corrosion of the pressure bearing member comprises a hydraulic cavitation eliminating device, wherein the hydraulic cavitation eliminating device comprises a tubular shell (1), a spindle body (2), a cylinder (3) and a ring body (4) in a fixing clamping piece, the ring body (4) is welded on the spindle body (2), after the cylinder (3) in the fixing clamping piece penetrates through the tubular shell (1), one end of the fixing clamping piece is welded with the ring body (4), and the other end of the fixing clamping piece is welded with the tubular shell (1), and the hydraulic cavitation eliminating device is characterized in that: the method comprises the following specific steps:
(S1): selecting a device corresponding to the material and specification according to the pipe diameter of the pipeline;
(S2): performing groove processing on two ends of the device, wherein the groove can be set to be V-shaped or U-shaped and is connected with an original pipeline, and the connection form is argon arc welding or argon electric union welding;
(S3): and regularly checking the thinning condition of the back end part in the operation of the unit.
2. The method of using an apparatus for preventing flow-accelerated corrosion of a bearing member according to claim 1, wherein: the inner wall of the tubular shell (1) is axially provided with ribs which are spirally arranged, the cross section of an internal thread is a concave curved surface triangle, the ribs which are spirally arranged are distributed at equal intervals, and the number of heads is controlled within the range of 3-8; the included angle between the spiral direction and the cross section is controlled within the range of 30-60 degrees; the circumferential bottom width of the fins is controlled within the range of 2-6 mm; the height of the highest point of the rib is controlled within the range of 0.5-1.5mm, and the position of the highest point of the rib is at the position of 1/2 of the width of the bottom of the rib.
3. The method of using an apparatus for preventing flow-accelerated corrosion of a bearing member according to claim 1, wherein: ribs which are spirally arranged are axially arranged on the spindle surface of the spindle body (2), the specifications and the arrangement forms of the ribs are consistent with those of the tubular shell (1), and the length of one axial end of the spindle body (2) is one time longer than the diameter of the tubular shell (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211561109.3A CN115789385A (en) | 2022-12-07 | 2022-12-07 | Use method of device for preventing flow accelerated corrosion of pressure-bearing member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211561109.3A CN115789385A (en) | 2022-12-07 | 2022-12-07 | Use method of device for preventing flow accelerated corrosion of pressure-bearing member |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115789385A true CN115789385A (en) | 2023-03-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211561109.3A Pending CN115789385A (en) | 2022-12-07 | 2022-12-07 | Use method of device for preventing flow accelerated corrosion of pressure-bearing member |
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| Country | Link |
|---|---|
| CN (1) | CN115789385A (en) |
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- 2022-12-07 CN CN202211561109.3A patent/CN115789385A/en active Pending
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