CN215372538U

CN215372538U - Furnace smoke pipeline nail-grabbing fixing structure

Info

Publication number: CN215372538U
Application number: CN202121503768.2U
Authority: CN
Inventors: 李继峰
Original assignee: SHANGHAI JIYI POWER STATION EQUIPMENT CO Ltd
Current assignee: SHANGHAI JIYI POWER STATION EQUIPMENT CO Ltd
Priority date: 2021-07-01
Filing date: 2021-07-01
Publication date: 2021-12-31
Anticipated expiration: 2031-07-01

Abstract

The utility model discloses a furnace smoke pipeline grabbing nail fixing structure which comprises a pouring layer, an inner heat-insulating layer, a membrane water-cooling wall layer and grabbing nails radially arranged between the pouring layer and the membrane water-cooling wall layer, wherein the pouring layer, the inner heat-insulating layer, the membrane water-cooling wall layer and the grabbing nails are sequentially arranged from inside to outside, the membrane water-cooling wall layer comprises a plurality of water-cooling pipes which are circumferentially arranged and flat steel connected between the water-cooling pipes, the inner heat-insulating layer comprises a plurality of layers of heat-insulating plates, each flat steel is provided with a plurality of grabbing nails which are vertically arranged at intervals, one ends of the grabbing nails are Y-shaped branched structures and are fixedly arranged in the pouring layer, and the other ends of the grabbing nails penetrate through the heat-insulating plates and the flat steel and are fixed with the flat steel. The utility model can play a role of fixing the heat insulation plates in a plurality of layers through the gripping nails; the insulation board can be flattened through the pressing sheet, and pouring of a subsequent pouring layer is facilitated.

Description

Furnace smoke pipeline nail-grabbing fixing structure

Technical Field

The utility model belongs to a flue, and particularly relates to a furnace flue pipe claw nail fixing structure.

Background

In a fan coal mill direct-fired pulverizing system of a lignite boiler power plant, the temperature of a conveying medium of a high-temperature furnace smoke pipeline from a smoke extraction port of a lignite boiler to an inlet of a fan coal mill is up to 1100 ℃, and the design and manufacture of the current high-temperature furnace smoke pipeline have the following three forms:

the first is an internal heat preservation form, namely a smoke pipeline of a high-temperature furnace is formed by welding common carbon steel plates, and the interior of the smoke pipeline is made of refractory bricks or lined with heat preservation materials and wear-resistant refractory materials. The second is an external heat preservation form, namely a high-temperature alloy steel pipe is adopted in a smoke pipeline of the high-temperature furnace, and a heat-resistant heat preservation material is coated outside the smoke pipeline. The third is a film type internal cooling high temperature furnace smoke pipeline appearing in the later period, the pipeline is a circular section, the pipeline is formed by surrounding carbon steel small-diameter seamless steel pipes along the circumference, and the carbon steel small-diameter seamless steel pipes are continuously welded through fins.

In the three forms, when the heat insulation material (such as a heat insulation plate) is used, the heat insulation material is usually anchored on refractory brick masonry or wear-resistant refractory material by using a fixed grabbing nail, however, in the actual use process, the fact that the multi-layer heat insulation material is only anchored is found, but the leveling between the multi-layer heat insulation material and the refractory brick masonry or wear-resistant refractory material is difficult to ensure, the heat insulation material is very easy to loosen and fall off in a high-temperature environment, the fixed grabbing nail is very easy to fall into a coal mill, and an impeller and a striking plate of the coal mill are also damaged, so that furnace shutdown and shutdown are caused, and the maintenance workload, the maintenance cost and the risk degree are increased; in addition, the other end of the fixing holding nails is in the materials such as refractory bricks, and the fixing holding nails are easy to damage the materials such as refractory bricks due to the stress action of expansion caused by heat and contraction caused by cold, so that the materials collapse.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a furnace flue pipe nail-grabbing and fixing structure which can effectively ensure flattening and anchoring among multiple layers of internal insulation layers.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a stove tobacco pipe says and grabs nail fixed knot and constructs, includes pouring layer, interior heat preservation, membrane type water-cooling wall layer that from interior to exterior set gradually and radially locates the grabs nail between pouring layer and the membrane type water-cooling wall layer, and the membrane type water-cooling wall layer includes a plurality of water-cooled tubes that are circumference and arrange, connects the band steel between the water-cooled tube, and interior heat preservation includes several layers of heated board, and the several of interval arrangement about being equipped with on every band steel is grabbed the nail, and grab nail one end is Y form bifurcation structure and sets firmly in the pouring layer, and the other end passes heated board and band steel and fixes mutually with the band steel, it is equipped with the preforming that is used for flattening interior heat preservation to go back the cover on the grab nail of Y form bifurcation structure rear side.

The ends of the bifurcate structures of the gripping nails are respectively provided with a plastic expansion cap.

The staples are sheared from the head by the rebar to form the Y-shaped bifurcation.

And the innermost layer insulation board of the inner insulation layer is a hydrophobic insulation board.

The pressing sheet is pressed against the inner surface of the hydrophobic insulation board.

The furnace smoke pipeline claw nail fixing structure has the following advantages that:

1. before the wear-resistant fire-resistant layer is poured, the heat-insulating plates in a plurality of layers can be anchored through the nails, and the heat-insulating plates can be flattened through the pressing sheets, so that the pouring of a subsequent pouring layer is facilitated;

2. by arranging the hydrophobic insulation board, the water in the casting material can be prevented from permeating into the inner insulation layer during casting, so that the insulation performance is prevented from being influenced;

3. by arranging the plastic expansion cap in the pouring layer, after high-temperature furnace smoke is introduced, the plastic expansion cap can be melted to generate a gap for eliminating stress, so that the condition that the pouring layer is damaged by the grabbing nails due to expansion caused by heat and contraction caused by cold is avoided;

4. by selecting the flattened V-shaped grabbing nail and not using the welding Y-shaped grabbing nail, intergranular corrosion of high-temperature flue gas to a welding line can be prevented, and the grabbing capability of the grabbing nail to a casting layer is ensured;

drawings

The following detailed description of the present invention is made with reference to the accompanying drawings and the embodiments:

FIG. 1 is a schematic view of the radial structure of a flue pipe of a furnace to which the stud fixing structure of the present invention is applied;

fig. 2 is a sectional view taken along line a-a of fig. 1.

Detailed Description

The furnace smoke pipeline nail-grabbing fixing structure is applied to a furnace smoke pipeline structure shown in a figure 1, and is combined with a figure 2, wherein the furnace smoke pipeline is sequentially provided with a wear-resistant and fire-resistant pouring layer 1, an inner heat-insulating layer 2, a membrane type water-cooling wall layer 3, an outer heat-insulating layer 4 and a metal aluminum shell layer 5 from inside to outside in the radial direction, the membrane type water-cooling wall layer 3 comprises a plurality of circumferentially arranged water-cooling seamless steel pipes 31, flat steels 32 connected between the water-cooling seamless steel pipes 31 and annular water collecting tanks 33 (only the annular water collecting tank 33 at the lower end is shown in the figure 2) communicated with the upper end and the lower end of the water-cooling seamless steel pipes 31, the water-cooling seamless steel pipes 31 and the flat steels 32 integrally form a metal tubular structure, and the annular water collecting tanks 33 are used for axially circulating cooling water to the water-cooling seamless steel pipes 31, so that the temperature of furnace smoke in the pipeline is adjusted; and, a bracket 6 of high temperature resistant material is fixed on the inner wall of the flat steel 32 in the radial direction.

The grabbing nail fixing structure comprises the pouring layer 1, the inner heat-insulating layer 2, the membrane type water-cooling wall layer 3 and grabbing nails 7 radially arranged between the pouring layer 1 and the membrane type water-cooling wall layer 3, the grabbing nails 7 are correspondingly arranged above and below the bracket 6, a plurality of grabbing nails 7 which are arranged at intervals up and down can be arranged on the same flat steel 32, one end of each grabbing nail 7 is provided with a nail claw and is fixed in the pouring layer 1, and the other end of each grabbing nail 7 penetrates through the inner heat-insulating layer 2 and fixes the inner heat-insulating layer 2 on the inner wall of the membrane type water-cooling wall layer 3.

The inner heat-insulating layer 2 comprises a plurality of layers of heat-insulating plates 21, the innermost heat-insulating plate is a hydrophobic heat-insulating plate 22, and the function of preventing the moisture of the casting material from permeating into the inner heat-insulating layer 2 can be achieved during casting; the nail claw of the grabbing nail 7 is of a Y-shaped branched structure, is fixed in the pouring layer 1 and can play a role in anchoring with the pouring layer 1, and the rear end of the grabbing nail penetrates through the inner heat insulation layer 2 and the flat steel 32 and is welded and fixed with the flat steel 32. Still the cover is equipped with the preforming 72 that is used for flattening interior heat preservation 2 on the nail 7 of grabbing nail 7's Y form bifurcation structure rear side, when passing several layers of heated board through nail 7, can offset with hydrophobic heated board 22 internal surface through the great contact surface of preforming 72 to flatten several layers of heated board pressure, be favorable to subsequent pouring.

The upper surface of the front end of the bracket 6 is provided with a plurality of circles of bearing steel rings 8 (two circles are shown in figures 1 and 2) which are fixedly arranged in the pouring layer 1 together with the front end of the bracket 6, the bearing steel rings 8 can be formed by connecting a plurality of arc steel bars in an end-to-end spot welding way, and the bearing steel rings can be automatically disconnected when expanding with heat and contracting with cold through the spot welding, so that the harm caused by stress can be eliminated; the Y-shaped branched structure of the grabbing nail 7 can be formed by flattening high-temperature-resistant round steel and cutting the head, so that the potential hazards of nail claw fracture and the like caused by intergranular corrosion of a welding seam by high-temperature smoke formed by welding are avoided. Bear steel ring 8 and locate outward and have plastics expansion sleeve 81, the branching tip of grabbing nail 7 is equipped with plastics expansion cap 71 respectively, so pour back in pouring layer 1, when leading to high temperature furnace smoke after, plastics expansion cap 71, plastics expansion sleeve 81 can melt in order to produce the clearance for stress relieving avoids leading to grabbing nail 7 or bearing steel ring 8 to destroy pouring layer 1 because of expending with heat and contracting with cold.

However, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present invention, and that changes and modifications to the above described embodiments are intended to fall within the scope of the appended claims, provided they fall within the true spirit of the present invention.

Claims

1. The utility model provides a stove smoke pipeline grabs nail fixed knot and constructs, includes that from interior to exterior sets gradually pouring layer, interior heat preservation, membrane type water-cooling wall layer and radially locate the grabs nail between pouring layer and the membrane type water-cooling wall layer, and the membrane type water-cooling wall layer includes a plurality of water-cooled tubes that are circumference and arrange, connects the band steel between the water-cooled tube, and interior heat preservation includes several layers of heated boards, its characterized in that: a plurality of grabbing nails are arranged on each flat steel at intervals, one ends of the grabbing nails are Y-shaped branched structures and are fixedly arranged in the pouring layer, the other ends of the grabbing nails penetrate through the heat insulation board and the flat steel and are fixed with the flat steel, and pressing sheets for flattening the inner heat insulation layer are further sleeved on the grabbing nails on the rear side of the Y-shaped branched structures.

2. The furnace smoke pipeline nail fixing structure of claim 1, wherein: the ends of the bifurcate structures of the gripping nails are respectively provided with a plastic expansion cap.

3. The furnace smoke pipeline nail fixing structure of claim 1, wherein: the staples are sheared from the head by the rebar to form the Y-shaped bifurcation.

4. The furnace smoke pipeline nail fixing structure of claim 1, wherein: and the innermost layer insulation board of the inner insulation layer is a hydrophobic insulation board.

5. The furnace smoke pipeline nail fixing structure of claim 4, wherein: the pressing sheet is pressed against the inner surface of the hydrophobic insulation board.