Structure for slowing down high-temperature corrosion of water cooling wall of power station boiler

Abstract

The utility model belongs to the technical field of boiler water-cooled walls, and particularly relates to a structure for slowing down high-temperature corrosion of a power station boiler water-cooled wall, which comprises a boiler wall, and further comprises a water-cooled pipe, a sliding chute, a scraper blade, a push rod, a positioning bolt and a guide strip which are arranged on one side of the boiler wall, according to the device, coal ash and oxides attached to the surface of the water-cooled pipe can fall off through work of the scraper and the water-cooled pipe, the surface of the water-cooled pipe is in a clean state for a long time, and the water-cooled pipe is prevented from falling off. The surface corrosion speed of oxides and coal ash can be reduced, the service life can be prolonged, the push rod can be located on the outer side of the furnace wall through work of the positioning bolt and the push rod, the scraper in the furnace can be controlled, and the push rod can be prevented from being corroded.

Description

Technical Field

[0001] The utility model belongs to the technical field of boiler water-cooled walls, and in particular relates to a structure for alleviating high-temperature corrosion of a water-cooled wall of a power station boiler. Background Art

[0002] The boiler water wall refers to the main heat-receiving part of the boiler. It is composed of several rows of steel pipes distributed around the boiler furnace. Its interior is flowing water or steam. It receives the heat of the flame in the boiler furnace from the outside. It mainly absorbs the radiation heat of the high-temperature combustion products in the furnace. The working fluid moves upward in it and evaporates due to the heat.

[0003] After checking the publication number: CN209213912U discloses a structure for slowing down the high temperature corrosion of the water-cooled wall of a power station boiler. This technology discloses "water-cooled wall tubes, fins and baffles of a power station boiler; a plurality of water-cooled wall tubes of a power station boiler are provided, and a plurality of water-cooled wall tubes of a power station boiler are connected by fins, and a plurality of water-cooled wall tubes of a power station boiler are arranged in a row; a baffle is fixed on the fin between two adjacent water-cooled wall tubes of a power station boiler, and the baffle is arranged vertically to the fin. The utility model can effectively reduce the scouring of the water-cooled wall by the airflow, reduce the concentration of sulfide in the flue gas contacting the water-cooled wall, thereby reducing the probability of high temperature corrosion; avoids the near-wall combustion of coal powder, and reduces the possibility of high temperature fatigue cracks and overheating".

[0004] Although this design can reduce the scouring of the water-cooled wall by the airflow and reduce the concentration of sulfides in the flue gas contacting the water-cooled wall, thereby reducing the chance of high-temperature corrosion; it avoids the near-wall combustion of coal powder and reduces the possibility of high-temperature fatigue cracks and overheating. However, after long-term use, a large amount of coal powder and oxides will still be attached to the surface of the device. In the subsequent use process, the oxides on its surface may increase its oxidation rate, thereby causing the tube wall to become thinner and leak, which is not conducive to the service life of the water-cooled wall.

[0005] In order to solve the above problems, the present application proposes a structure for alleviating high temperature corrosion of the water-cooled wall of a power station boiler. Utility Model Content

[0006] To solve the problems raised in the above background technology. The utility model provides a structure for slowing down the high-temperature corrosion of the water-cooled wall of a power station boiler. The scraper and the water-cooled pipe can make the coal ash and oxides attached to the surface of the water-cooled pipe fall off, so that the surface of the water-cooled pipe is kept clean for a long time, which can reduce the corrosion rate of the oxides and coal ash on its surface, and is conducive to extending its service life. The positioning bolt and the push rod can be located on the outside of the furnace wall to control the internal scraper, which can avoid corrosion of the push rod.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a structure for slowing down high-temperature corrosion of a water-cooled wall of a power station boiler, comprising a furnace wall, and also comprising a water-cooling pipe, a chute, a scraper, a push rod, a positioning bolt and a guide strip arranged on one side of the furnace wall, the water-cooling pipe being fixedly arranged on the surface of one side of the furnace wall, and the chute being also fixedly arranged on the surface of the water-cooling pipe, and the surface of the water-cooling pipe being also slidably connected to the surface of the scraper, and at the same time, one side surface of the scraper is also connected to one end of the push rod, the surface of the push rod is slidably connected to the inner surface of the chute, and the chute is slidably connected to the surface of the scraper, and the push rod is slidably connected to the furnace wall, and at the same time, the guide strip is fixedly installed on the surface of the furnace wall, and the surface of the guide strip is also slidably connected to the positioning bolt, and the positioning bolt is slidably connected to the surface of the push rod.

[0008] As a preferred structure for alleviating high-temperature corrosion of a water-cooled wall of a power station boiler according to the utility model, the shape of the slide groove matches the shape of the push rod.

[0009] As a preferred structure for alleviating high-temperature corrosion of a water-cooled wall of a power station boiler according to the utility model, the edge shape of the scraper matches the surface undulation shape of the water-cooled pipe.

[0010] As a preferred structure for alleviating high temperature corrosion of a water-cooled wall of a power station boiler according to the utility model, the push rods are connected end to end in a chain shape.

[0011] As a preferred structure for alleviating high temperature corrosion of a water-cooled wall of a power station boiler according to the utility model, the shape of the positioning bolt is "L"-shaped.

[0012] As a preferred structure for alleviating high temperature corrosion of a water-cooled wall of a power station boiler according to the utility model, the guide strips are arranged parallel to each other on the surface of the furnace wall, and through holes matching the guide strips are provided on the surface of the positioning bolts.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: through the operation of the scraper and the water-cooling pipe, the coal ash and oxides attached to the surface of the water-cooling pipe can fall off, so that the surface of the water-cooling pipe is in a clean state for a long time, which can reduce the corrosion rate of the oxide and coal ash on its surface, which is beneficial to prolonging its service life; and through the operation of the positioning bolt and the push rod, the push rod can be located on the outside of the furnace wall so that the internal scraper can be controlled, which can prevent the push rod from being corroded. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the push rod and the positioning bolt in the utility model in a separated state;

[0017] Figure 3 It is a schematic diagram of the structure of the water cooling pipe and the scraper in the present utility model in sliding state;

[0018] Figure 4 It is a schematic diagram of the water cooling pipe and scraper structure in the utility model;

[0019] Figure 5 It is a schematic diagram of the structure of the slideway and the push rod in the utility model;

[0020] In the figure:

[0021] 1. Furnace wall; 2. Water cooling pipe; 3. Slide; 4. Scraper; 5. Push rod; 6. Positioning bolt; 7. Guide strip. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, 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.

[0023] Embodiment 1

[0024] like Figure 1 As shown:

[0025] A structure for slowing down high temperature corrosion of a water-cooled wall of a power station boiler comprises a furnace wall 1.

[0026] In this embodiment: the existing {public announcement number}: CN209213912U discloses a structure for slowing down the high-temperature corrosion of the water-cooled wall of a power station boiler. This patent discloses the water-cooled wall tubes of a power station boiler. The water-cooled tube 2 in the present application document adopts the same technical means in this prior art. This technical means will not be described one by one here. For details about the improvement of this prior art, please refer to the disclosed technology below; to solve the technical problems existing in this prior art, as disclosed in the background technology above, "after a long period of use, the surface of the device will still be attached with a large amount of coal powder and oxides. In the subsequent use process, the oxides on its surface may increase its oxidation rate, thereby causing the tube wall to become thinner and leak, which is not conducive to the service life of the water-cooled wall". In terms of combined use, this problem is obviously a real problem that exists and is relatively difficult to solve. In view of this, in order to solve the above-mentioned problems, water-cooled tubes 2 and slide grooves 3 are added on this basis.

[0027] More specifically:

[0028] like Figure 1 - Figure 5 As shown:

[0029] In combination with the above content: it also includes a water-cooling pipe 2, a chute 3, a scraper 4, a push rod 5, a positioning bolt 6 and a guide strip 7 arranged on one side of the furnace wall 1. The water-cooling pipe 2 is fixedly arranged on the surface of one side of the furnace wall 1, and the chute 3 is also fixedly arranged on the surface of the water-cooling pipe 2, and the surface of the water-cooling pipe 2 is also slidably connected to the surface of the scraper 4, and at the same time, one side surface of the scraper 4 is also connected to one end of the push rod 5, the surface of the push rod 5 is slidably connected to the inner surface of the chute 3, and the chute 3 and the surface of the scraper 4 are slidably connected, and the push rod 5 is slidably connected to the furnace wall 1, and at the same time, the surface of the furnace wall 1 is also fixedly installed with a guide strip 7, the surface of the guide strip 7 is also slidably connected to the positioning bolt 6, and the positioning bolt 6 and the surface of the push rod 5 are slidably connected.

[0030] When the cleaning work is completed, the push rod 5 can be pulled to reset the scraper 4. Finally, when the hole opened on the surface of the push rod 5 is exposed to the furnace wall 1, the positioning bolt 6 can be used to position the push rod 5 again, so as to maintain the closed state of the interior of the furnace wall 1.

[0031] Going further:

[0032] In an optional embodiment, the shape of the slide groove 3 matches the shape of the push rod 5 .

[0033] In this embodiment: through the connection between the slide groove 3 and the push rod 5, the push rod 5 can move along the inner surface of the slide groove 3, so that it can push the scraper 4 to move, thereby promoting the cleaning work on the surface of the water-cooling pipe 2.

[0034] Going further:

[0035] In an optional embodiment, the edge shape of the scraper 4 matches the surface undulation shape of the water-cooling pipe 2 .

[0036] In this embodiment, the scraper 4 that matches the undulations on the surface of the water-cooling tube 2 can create an effective connection between the two, and when the scraper 4 is displaced, the scraper 4 can clean the oxides or dust on the surface of the water-cooling tube 2.

[0037] Going further:

[0038] In an optional embodiment, the push rods 5 are connected end to end in a chain shape.

[0039] In this embodiment, the push rods 5 of the chain structure can be freely distributed outside the furnace wall 1, which can reduce the space occupied.

[0040] Going further:

[0041] In an optional embodiment, the positioning bolt 6 is in an "L" shape.

[0042] In this embodiment, the “L”-shaped positioning bolt 6 can form an effective connection with the push rod 5 and the guide strip 7 , so that the push rod 5 can block the hole opened on the surface of the furnace wall 1 to seal the furnace wall 1 .

[0043] Going further:

[0044] In an optional embodiment, the guide strips 7 are arranged parallel to each other on the surface of the furnace wall 1 , and a through hole matching the guide strips 7 is opened on the surface of the positioning bolt 6 .

[0045] In this embodiment, the guide strips 7 arranged parallel to each other can enable the positioning bolt 6 to slide smoothly along the surface thereof, thereby ensuring that the positioning bolt 6 can smoothly form a connection with the push rod 5 and fix the position of the push rod 5.

[0046] When the cleaning work is completed, the push rod 5 can be pulled to reset the scraper 4. Finally, when the hole opened on the surface of the push rod 5 is exposed to the furnace wall 1, the positioning bolt 6 can be used to position the push rod 5 again, so as to maintain the closed state of the interior of the furnace wall 1.

[0047] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A structure for slowing down high temperature corrosion of a water-cooled wall of a power station boiler, comprising a furnace wall (1), characterized in that: The invention also comprises a water-cooling pipe (2), a slide groove (3), a scraper (4), a push rod (5), a positioning bolt (6) and a guide strip (7) arranged on one side of the furnace wall (1); the water-cooling pipe (2) is fixedly arranged on the surface of one side of the furnace wall (1); the slide groove (3) is also fixedly arranged on the surface of the water-cooling pipe (2); the surface of the water-cooling pipe (2) is also slidably connected to the surface of the scraper (4); at the same time, the surface of one side of the scraper (4) is also connected to one end of the push rod (5); the surface of the push rod (5) is slidably connected to the inner surface of the slide groove (3); the slide groove (3) and the surface of the scraper (4) are slidably connected; the push rod (5) and the furnace wall (1) are slidably connected; at the same time, the surface of the furnace wall (1) is also fixedly installed with the guide strip (7); the surface of the guide strip (7) is also slidably connected to the positioning bolt (6); and the positioning bolt (6) and the surface of the push rod (5) are slidably connected.

2. The structure for mitigating high temperature corrosion of water-cooled walls of power station boilers according to claim 1 is characterized in that: The shape of the slide groove (3) matches the shape of the push rod (5).

3. The structure for mitigating high temperature corrosion of water-cooled walls of power station boilers according to claim 1 is characterized in that: The edge shape of the scraper (4) matches the surface undulation shape of the water cooling pipe (2).

4. The structure for mitigating high temperature corrosion of water-cooled walls of power station boilers according to claim 1 is characterized in that: The push rods (5) are connected end to end in a chain shape.

5. The structure for mitigating high temperature corrosion of water-cooled walls of power station boilers according to claim 1 is characterized in that: The positioning bolt (6) is in an "L" shape.

6. The structure for mitigating high temperature corrosion of water-cooled walls of power station boilers according to claim 1, Features: The guide strips (7) are arranged parallel to each other on the surface of the furnace wall (1). A through hole matching the guide strip (7) is provided on the surface of the positioning bolt (6).

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