CN219159825U

CN219159825U - Device for preventing flow acceleration corrosion of pressure-bearing member

Info

Publication number: CN219159825U
Application number: CN202223267582.9U
Authority: CN
Inventors: 王林; 路昆; 苏晓阳; 刘昕颖; 张雷; 李�根; 尚伟; 夏晓涛
Original assignee: Huadian Electric Power Research Institute Co Ltd
Current assignee: Huadian Electric Power Research Institute Co Ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-06-09
Anticipated expiration: 2032-12-07

Abstract

The utility model relates to a device for preventing flow acceleration corrosion of a pressure-bearing member, and belongs to the field of flow acceleration corrosion of pressure-bearing members of thermal power generating units. The utility model comprises a tubular shell, a spindle body, a fixed clamping piece middle cylinder and a ring body, wherein the ring body is welded on the spindle body, one end of the fixed clamping piece middle cylinder is welded with the ring body, the other end of the fixed clamping piece middle cylinder is welded with the tubular shell, the spindle body is a solid forging, and the spindle body can be combined with the fixed clamping piece middle cylinder. The utility model has simple and reasonable structural 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 member and meets the use requirement.

Description

Device for preventing flow acceleration corrosion of pressure-bearing member

Technical Field

The utility model relates to a device, in particular to a device for preventing flow acceleration corrosion of a pressure-bearing member, and belongs to the field of flow acceleration corrosion of the pressure-bearing member of a thermal power unit.

Background

In recent years, with the improvement of national requirements on environmental standards, new energy power is greatly improved, and meanwhile, the requirements on the operation adjustability of a coal motor unit are higher, so that the reliability standard for the operation safety of the pressure-bearing member of the thermal power unit is improved, and the method provides new challenges for the safe operation of the pressure-bearing pipeline in the power system in the face of frequent start-stop of the thermal power unit.

The flow accelerating corrosion phenomenon is a phenomenon that a metal protection oxide film is accelerated to dissolve due to the fact that fluid flows at a certain temperature and pressure. In the boiler and the turbine room of the thermal power generating unit in service, a plurality of pipelines are arranged, especially at the elbow, the reducing and the tee joint of the temperature reducing pipeline and the drainage pipeline, the hydrodynamic cavitation phenomenon can occur due to the existence of two-phase flow and the change of fluid flow velocity, and the reduction and the falling-off of an oxide film on the inner wall of the pipeline are caused, so that the wall of the pipeline is thinned, and the method is a serious potential threat to the safe operation of the pipeline. Hydrodynamic cavitation is a state in which a low pressure and a high flow rate are artificially manufactured at a position of a pipeline through which liquid passes, when the pressure of the liquid is smaller than the saturated vapor pressure, bubbles in the liquid are continuously expanded, the volume is increased, and when the bubbles move along with the fluid, the bubbles collapse and burst after reaching the high pressure and the low flow rate, and impact the inner wall of the pipeline adjacent to the bubbles.

In view of the foregoing, it would be particularly desirable to provide an apparatus and method for preventing flow-induced corrosion of a pressure-containing member.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art, and provides the use method of the device for preventing the flow accelerated corrosion of the pressure-bearing member, which has the advantages of simple and reasonable structural design, safety, reliability, convenient operation and adjustment and strong universality, can be suitable for different pipelines, and greatly prolongs the service life of the pressure-bearing member.

The utility model solves the problems by adopting the following technical scheme: this a device for preventing corrosion is accelerated to pressure-containing member flow, cylinder and ring body in managing dress shell, spindle, fixed fastener, its characterized in that: the ring body is welded on the spindle body, one end of the cylinder in the fixing clamp is welded with the ring body, the other end of the cylinder in the fixing clamp is welded with the tubular shell, the spindle body is a solid forging, and the spindle body can be combined with the cylinder in the fixing clamp.

Preferably, the tubular shell is provided with four round holes matched with the fixed clamping piece cylinder, and the size of the round holes is set to be 6-10mm.

Preferably, the inner wall of the tubular shell is provided with the ribs which are axially spirally arranged, the cross section of the internal thread is a triangle with an inward concave curved surface, and the ribs which are spirally arranged are distributed at equal intervals.

Preferably, the spindle face of the spindle body is axially provided with ribs which are spirally arranged.

Preferably, the tubular shell of the utility model adopts a pipe fitting made of 15CrMoG, 12Cr1MoVG or SA 335-P91.

Preferably, the spindle body of the utility model adopts a solid forging piece made of 15CrMo, 12Cr1MoV or SA336F 91.

Preferably, the fixing clamping piece is made of 15CrMoG or 12Cr1MoVG, and consists of four fixing clamping pieces with 6-10mm, namely, a cylinder and a circular ring with 8-12mm diameter.

Compared with the prior art, the utility model has the following advantages and effects: (1) The device has reasonable overall design, safety and reliability and convenient operation, can prevent and protect the corrosion and thinning of the pressure-bearing member which is easy to flow accelerated corrosion, and slows down the thinning trend of the member. (2) The device is easy to operate, safe and reliable to use, convenient to operate and adjust, high in universality, applicable to different pipelines and capable of greatly prolonging the service life of the pressure-bearing member.

Drawings

FIG. 1 is a schematic diagram of an apparatus for eliminating hydrodynamic cavitation according to an embodiment of the present utility model.

Fig. 2 is a schematic diagram of the operation and use of the apparatus (reducer pipe) for eliminating hydrodynamic cavitation according to the embodiment of the present utility model.

In the figure: the pipe is provided with a shell 1, a spindle body 2, a fixed clamping piece middle cylinder 3 and a ring body 4.

Detailed Description

The present utility model will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present utility model and not limited to the following examples.

Examples.

Referring to fig. 1 to 2, the present embodiment of an apparatus for preventing flow accelerated corrosion of a pressure-containing member and a method of using the same is based on the principle that flow velocity variation in a piping system can be alleviated by reducing the occurrence of a hydrodynamic cavitation phenomenon, thereby avoiding flow accelerated corrosion of an inner wall of a pipe; the structure is mainly composed of ribs which are arranged in a spiral manner, and the structure is realized by providing a device for eliminating the hydrodynamic cavitation phenomenon and improving the structure of the inner wall of the pressure-bearing member.

The device for eliminating hydrodynamic cavitation in the embodiment comprises a tubular shell 1, a spindle body 2, a fixed clamping piece middle cylinder 3 and a ring body 4, wherein the specific structure is shown in fig. 1:

the tubular casing 1 in this embodiment may be made of pipe elements made of 15CrMoG, 12Cr1MoVG, SA335-P91, etc., and may be combined with the fixing clip; 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 1 is provided with ribs which are axially spirally arranged, the section of the internal thread is a concave curved 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 rib 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 1/2 of the bottom width of the rib; 4 round holes matched with the cylinder 3 in the fixing clamp are arranged on the tubular shell 1, and the size specification of the round holes is generally set to 6-10mm.

The spindle body 2 in the embodiment can be a solid forging piece made of 15CrMo, 12Cr1MoV, SA336F91 and other materials, and can be combined with the fixing clamping piece; the maximum diameter is less than 10mm-25mm than the tube-mounted shell 1; the spindle face of the spindle body 2 is axially provided with ribs which are spirally arranged, and the specification of the ribs can be consistent with the arrangement form and the tubular shell 1; the length of one axial end of the spindle body 2 is more than one time the diameter of the tubular housing 1.

The fixing clamp in the embodiment consists of four fixing clamp middle cylinders 3 with the specifications of 6-10mm and four annular bodies 4 with the diameters of 8-12mm, wherein the materials of the four fixing clamp middle cylinders are 15CrMoG and 12Cr1 MoVG. The ring body 4 is welded on the spindle body 2, one end of the cylinder 3 in the fixing clamp penetrates through the tubular shell 1 and is welded with the 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 tube housing 1 and the spindle body 2 and to make the axis of the spindle body 2 coincide with the axis of the tube housing 1.

The pressure-bearing member of the embodiment improves the structure of the inner wall, and can be processed into ribs which are spirally arranged in the axial direction of the inner wall at the parts of the inner wall of the elbow, the reducer pipe and the tee joint, which are easy to flow and accelerate corrosion, the sections of the ribs which are spirally arranged are concave curved triangles, 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 streamline direction and the cross section is controlled within the range of 30-60 degrees; the circumferential bottom width of the rib 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 1/2 of the bottom width of the rib.

The pipe-mounted shell 1, the spindle body 2 and the inner wall of the improved pressure-bearing member in the hydrodynamic cavitation device are eliminated, and the ribs which are arranged in a spiral mode are arranged on the inner wall of the improved pressure-bearing member.

The device of the embodiment can be arranged at the front end of a pressure-bearing member which is easily affected by turbulence, such as a pipeline elbow, a reducer pipe and the like, and the installation mode adopts a welding mode.

The device for preventing flow acceleration corrosion of the pressure-bearing member in the embodiment comprises the following steps: (1) According to the pipe diameter selection of the pipeline, the device corresponding to the material and specification; (2) The two ends of the device are subjected to groove treatment, the groove form can be set to be V-shaped or U-shaped, the groove is connected with an original pipeline, and argon arc welding or argon electric welding is adopted as a connection form; (3) The thinning of the back-end part is checked regularly during operation of the unit.

The device (reducer pipe) for eliminating hydrodynamic cavitation phenomenon in the embodiment is an operation and use schematic diagram, can be applied to the rear end of the reducer pipe in a water-reducing and water-draining pipe system, can prevent and protect erosion thinning of the reducer pipe which is easy to flow accelerated corrosion, and slows down the thinning trend of components.

From the above description, those skilled in the art will be able to practice.

In addition, it should be noted that the specific embodiments described in the present specification may vary from part to part, from name to name, etc., and the above description in the present specification is merely illustrative of the structure of the present utility model. All equivalent or simple changes of the structure, characteristics and principle according to the inventive concept are included in the protection scope of the present patent. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions in a similar manner without departing from the scope of the utility model as defined in the accompanying claims.

Claims

1. The utility model provides a device for preventing corrosion is accelerated to pressure-bearing member flow, includes in pipe dress shell (1), spindle (2), fixed fastener cylinder (3) and ring body (4), its characterized in that: the annular body (4) is welded on the spindle body (2), one end of the cylinder (3) in the fixing clamp is welded with the annular body (4), the other end of the cylinder (3) in the fixing clamp is welded with the tubular shell (1), the spindle body (2) is a solid forging, and the spindle body (2) can be combined with the cylinder (3) in the fixing clamp.

2. The apparatus for preventing flow accelerated corrosion of a pressure containing member according to claim 1, wherein: four round holes matched with the fixed clamping piece cylinder (3) are arranged on the tubular shell (1), and the size of the round holes is set to be 6-10mm.

3. The apparatus for preventing flow accelerated corrosion of a pressure containing member according to claim 1 or 2, wherein: the inner wall of the tubular shell (1) is provided with ribs which are axially spirally arranged, the section of the internal thread is a triangle with an indent curved surface, and the ribs which are spirally arranged are distributed at equal intervals.

4. The apparatus for preventing flow accelerated corrosion of a pressure containing member according to claim 1, wherein: the spindle surface of the spindle body (2) is axially provided with ribs which are spirally arranged.

5. The apparatus for preventing flow accelerated corrosion of a pressure containing member according to claim 1, wherein: the pipe fitting shell (1) is made of pipe fittings made of 15CrMoG, 12Cr1MoVG or SA 335-P91.

6. The apparatus for preventing flow accelerated corrosion of a pressure containing member according to claim 1, wherein: the spindle body (2) is made of a solid forging piece made of 15CrMo, 12Cr1MoV or SA336F 91.

7. The apparatus for preventing flow accelerated corrosion of a pressure containing member according to claim 1, wherein: the fixing clamp is made of 15CrMoG or 12Cr1MoVG, and consists of four fixing clamp middle cylinders (3) with the diameters of 6-10mm and a ring body (4) with the diameters of 8-12 mm.