Internal and external spiral blast-furnace tuyere small sleeve

Abstract

The utility model discloses an internal and external spiral blast furnace tuyere small sleeve, which comprises a flange, an inner sleeve, an outer sleeve and a fluid director, the outer sleeve is sleeved on the outer side of the inner sleeve, the outer sleeve, the inner sleeve and the flange define an internal cavity, and the fluid director is arranged in the internal cavity; a water inlet and a water outlet are formed in the flange, the fluid director divides the inner cavity into a rear water chamber, an outer spiral water channel, an inner spiral water channel and a front water chamber, the outer spiral water channel is located on the outer side of the inner spiral water channel, the rear water chamber is located on the rear sides of the outer spiral water channel and the inner spiral water channel, and the front water chamber is located on the front sides of the outer spiral water channel and the inner spiral water channel; the water inlet is communicated with the rear end of the inner spiral water channel through a water inlet pipe, or the water inlet is communicated with the rear end of the outer spiral water channel through a water inlet pipe. The internal and external spiral blast-furnace tuyere small sleeve is simple and reasonable in structure, uniform in overall heat transfer, better in cooling effect and capable of effectively prolonging the service life.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of cooling equipment of blast furnace air supply system of iron-making blast furnace, in particular to a kind of inner and outer helical blast furnace tuyere small sleeve. BACKGROUND

[0002] The most severe working environment of the cooling element in the iron-making blast furnace is the tuyere small sleeve, and the severe working environment is shown as follows: (1) the tuyere small sleeve is subjected to the impact of the largest heat flow intensity of the blast furnace when conveying blast at a temperature of 1200 DEG C or above and working in front of the coke revolving area with a temperature of 2000 DEG C or above; (2) liquid slag and iron droplets fall above the tuyere, and the tuyere may directly contact the liquid slag and iron droplets when the revolving area of the tuyere is not active, so the tuyere small sleeve extending into the furnace may be subjected to the test of slag and iron corrosion at any time; (3) the tuyere outer sleeve is subjected to mechanical friction of the red-hot coke entering the revolving area of the tuyere, and the tuyere inner sleeve is subjected to the scouring of the conveyed coal powder when coal is injected. The above-mentioned severe working environment requires that the tuyere small sleeve has the superior performance of intensified cooling and reduced heat exchange amount between hot blast and low-temperature water. With the continuous improvement of the smelting intensity of the blast furnace, the working condition of the tuyere is more severe, and higher requirements are put forward for the cooling performance of the tuyere small sleeve.

[0003] The internal part of the tuyere small sleeve in the prior art is mostly a cyclone type or a cross-flow type flow guide structure, and the flow guide structure is integrally cast or combined welded by a cone sleeve and a flow guide ring or a partition plate to separate the internal cavity of the tuyere small sleeve. The flow guide ring or the partition plate separates the part of the internal cavity on the outside of the cone sleeve into a plurality of water chambers and forms a cyclone type cooling water passage, and the part of the internal cavity on the inside of the cone sleeve forms a larger cavity. When the above-mentioned cyclone type flow guide structure guides the flow, the cooling water flows from the larger cavity into the water channel in front of the tuyere, then rotates in the plurality of water chambers on the outside of the cone sleeve, and finally flows out through the water outlet passage. When the above-mentioned cross-flow type flow guide structure guides the flow, the cooling water first rotates in the plurality of water chambers on the outside of the cone sleeve, then enters the water channel in front of the tuyere, then enters the larger cavity, and finally flows out through the water outlet passage. Compared with the cooling of the traditional overall cavity type structure, although the cooling effect of the tuyere outer sleeve is improved by the above-mentioned two types of flow guide structures, the part of the internal cavity on the inside of the cone sleeve still forms a larger cavity, and a dead water area is still easily formed, the cooling water cannot fully take away the heat, the cooling of the copper wall of the tuyere hot blast passage is poor, the required cooling effect of the tuyere under the condition of high smelting intensity cannot be achieved, and the service life of the tuyere is affected. SUMMARY

[0004] The problem to be solved by the utility model is to provide a kind of inner and outer helical blast furnace tuyere small sleeve, and the inner and outer helical blast furnace tuyere small sleeve has simple and reasonable structure, uniform overall heat transfer, better cooling effect, and can effectively improve the service life.

[0005] In order to solve the above technical problems, the utility model adopts the technical scheme as follows:

[0006] A kind of inner and outer spiral blast furnace tuyere small sleeve, including flange, inner sleeve, outer sleeve and flow director, outer sleeve is sleeved in the outside of inner sleeve, outer sleeve, inner sleeve and flange enclose an internal cavity, flow director is set in the internal cavity;Flange is equipped with water inlet and water outlet, characterized by: the flow director separates the internal cavity into rear water chamber, outer spiral water channel, inner spiral water channel and front water chamber, and outer spiral water channel is at the outside of inner spiral water channel, rear water chamber is at the rear side of outer spiral water channel, inner spiral water channel, front water chamber is at the front side of outer spiral water channel, inner spiral water channel;

[0007] Water inlet is communicated with the rear end of inner spiral water channel by water inlet pipe, the front end of inner spiral water channel is communicated with the front end of outer spiral water channel by front water chamber, the rear end of outer spiral water channel is communicated with rear water chamber, and rear water chamber is communicated with water outlet;Or, water inlet is communicated with the rear end of outer spiral water channel by water inlet pipe, the front end of outer spiral water channel is communicated with the front end of inner spiral water channel by front water chamber, the rear end of inner spiral water channel is communicated with rear water chamber, and rear water chamber is communicated with water outlet.

[0008] The above definitions of inner and outer: with the hot blast passage of tuyere small sleeve as reference, the side close to hot blast passage is inner, and the side far from hot blast passage is outer.

[0009] The above water inlet pipe is in rear water chamber, but not communicated with the inside of rear water chamber, and cooling water in rear water chamber can surround water inlet pipe.In the case that water inlet is communicated with the rear end of inner spiral water channel by water inlet pipe, cooling water is entered into inner spiral water channel from water inlet through water inlet pipe, so that cooling water flows spirally in inner spiral water channel, then cooling water is drained into outer spiral water channel through front water chamber, so that cooling water flows spirally in outer spiral water channel, and finally water is discharged through rear water chamber and water outlet, to realize spiral alternating distribution arrangement of inner water inlet passage and outer water outlet passage.In the case that water inlet is communicated with the rear end of outer spiral water channel by water inlet pipe, cooling water is entered into outer spiral water channel from water inlet through water inlet pipe, so that cooling water flows spirally in outer spiral water channel, then cooling water is drained into inner spiral water channel through front water chamber, so that cooling water flows spirally in inner spiral water channel, and finally water is discharged through rear water chamber and water outlet.Both inner and outer cooling water flow spirally, so that outer sleeve and inner sleeve are fully cooled, overall heat transfer is uniform, and cooling effect is better.

[0010] In the preferred embodiment, the flow guide comprises a spiral flow guide ring, a planar flow guide ring arranged in front of the spiral flow guide ring, and a water baffle arranged on the front side of the planar flow guide ring; the outer side of the spiral flow guide ring is provided with an outer spiral groove with its groove opening facing outward, and the inner side of the outer sleeve closes the groove opening of the outer spiral groove to form an outer spiral water channel; the inner side of the spiral flow guide ring is provided with an inner spiral groove with its groove opening facing inward, and the outer side of the inner sleeve closes the groove opening of the inner spiral groove to form an inner spiral water channel; the edge of the water baffle is tightly fitted with the inner wall of the front end of the internal cavity; the rear water chamber is located at the rear side of the spiral flow guide ring, and the front water chamber is located at the front side of the planar flow guide ring; the planar flow guide ring separates the front water chamber from the outer spiral water channel and the inner spiral water channel; the planar flow guide ring is provided with a first through hole and a second through hole, and the water baffle separates the first through hole from the second through hole; the front end of the outer spiral water channel is communicated with the front water chamber through the first through hole, and the front end of the inner spiral water channel is communicated with the front water chamber through the second through hole.

[0011] When the water inlet is communicated with the rear end of the inner spiral water channel through the water inlet pipe, the cooling water enters the water inlet on the flange, first passes through the inner spiral water channel, and then enters the front water chamber through the second through hole after cooling the inner sleeve; the cooling water flows through the front water chamber and cools the front end of the tuyere sleeve, and then enters the outer spiral water channel through the first through hole; the cooling water passes through the outer sleeve and the spiral flow guide ring, and then enters the rear water chamber; finally, the water is discharged outside the tuyere sleeve through the water outlet on the flange.

[0012] When the water inlet is communicated with the rear end of the outer spiral water channel through the water inlet pipe, the cooling water enters the water inlet on the flange, first passes through the outer spiral water channel, and then enters the front water chamber through the first through hole after cooling the outer sleeve; the cooling water flows through the front water chamber and cools the front end of the tuyere sleeve, and then enters the inner spiral water channel through the second through hole; the cooling water passes through the inner sleeve and the spiral flow guide ring, and then enters the rear water chamber; finally, the water is discharged outside the tuyere sleeve through the water outlet on the flange.

[0013] Generally, the outer edge of the planar flow guide ring is tightly fitted with the inner side of the outer sleeve, and the inner edge of the planar flow guide ring is tightly fitted with the outer side of the inner sleeve.

[0014] In the more preferred embodiment, the outer spiral groove and the inner spiral groove have the same rotation direction and are arranged alternately.

[0015] In the further more preferred embodiment, the cross-sectional shape of the outer spiral groove and the inner spiral groove is V-shaped or U-shaped.

[0016] In a further preferred embodiment, the material of the spiral guide ring, the planar guide ring and the baffle is steel.

[0017] In a preferred embodiment, the opening cross-sectional area of the water inlet pipe gradually decreases from the rear end to the front end.

[0018] In a further preferred embodiment, the rear end opening of the water inlet pipe is a circular opening, and the rear end of the water inlet pipe is connected to the flange; the front end opening of the water inlet pipe is an elliptical opening, and the front end of the water inlet pipe is connected to the rear end of the spiral guide ring.

[0019] In a further preferred embodiment, the material of the water inlet pipe is steel.

[0020] In a specific embodiment, the front end of the inner sleeve is connected to the front end of the outer sleeve, and the rear end of the outer sleeve and the rear end of the inner sleeve are fixedly connected to the flange. In a preferred embodiment, the front end of the inner sleeve is connected to the front end of the outer sleeve through a first annular weld, the rear end of the outer sleeve is connected to the flange through a second annular weld, and the rear end of the inner sleeve is connected to the flange through a third annular weld. The material of the inner sleeve, the outer sleeve and the flange is copper, copper alloy or steel.

[0021] Compared with the prior art, the utility model has the following advantages:

[0022] The flow guide device of the utility model adopts the inner-outer double spiral water channel structure, can overcome the structural defects of the traditional cavity type and the tubular type, can ensure that the cooling water can uniformly flow through the inner sleeve outer wall and the outer sleeve inner wall surface in the internal cavity, can timely take away the heat, can effectively synchronously cool the tuyere inner sleeve, the outer sleeve and other components, can make the cooling water flow more smooth and reasonable in the internal cavity, can more fully take away the heat, and the cooling effect is better, so as to effectively improve the overall service life of the tuyere small sleeve. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the structure schematic view of the utility model embodiment 1;

[0024] Figure 2 is Figure 1 the structure schematic view of the flow guide device in the embodiment 1;

[0025] Figure 3 is Figure 2 the structure schematic view of the flow guide device part section in the embodiment 1;

[0026] Figure 4 is the structure schematic view in the utility model embodiment 2. DETAILED DESCRIPTION

[0027] The utility model will be specifically described in connection with the drawings and specific embodiments.

[0028] Example 1

[0029] like Figures 1-3 As shown, the inner and outer spiral blast furnace tuyeres in this embodiment include a flange 1, an inner sleeve 2, an outer sleeve 3, and a flow guide 4. The outer sleeve 3 is fitted outside the inner sleeve 2. The outer sleeve 3, inner sleeve 2, and flange 1 form an internal cavity 5. The flow guide 4 is disposed within the internal cavity 5. The flange 1 is provided with an inlet 11 and an outlet 12. The flow guide 4 divides the internal cavity 5 into a rear water chamber 51, an outer spiral water channel 52, an inner spiral water channel 53, and a front water chamber 54. The outer spiral water channel 52 is located in the... Outside the inner spiral waterway 53, the rear water chamber 51 is located behind the outer spiral waterway 52 and the inner spiral waterway 53, and the front water chamber 54 is located in front of the outer spiral waterway 52 and the inner spiral waterway 53; the inlet 11 is connected to the rear end of the inner spiral waterway 53 through the inlet pipe 6, the front end of the inner spiral waterway 53 is connected to the front end of the outer spiral waterway 52 through the front water chamber 54, the rear end of the outer spiral waterway 52 is connected to the rear water chamber 51, and the rear water chamber 51 is connected to the outlet 12.

[0030] The above definitions of inside and outside are as follows: taking the hot air channel 7 of the small air vent as the reference, the side closer to the hot air channel 7 is the inside, and the side farther away from the hot air channel 7 is the outside.

[0031] The aforementioned inlet pipe 6 is located in the rear water chamber 51, but it is not interconnected with the interior of the rear water chamber 51. The cooling water in the rear water chamber 51 can surround the inlet pipe 6. With the inlet 11 connected to the rear end of the inner spiral water channel 53 through the inlet pipe 6, the cooling water enters the inner spiral water channel 53 from the inlet 11 through the inlet pipe 6, causing the cooling water to flow in a spiral shape in the inner spiral water channel 53. Then, the cooling water is guided through the front water chamber 54 to the outer spiral water channel 52, causing the cooling water to flow in a spiral shape in the outer spiral water channel 52. Finally, the water is discharged through the rear water chamber 51 and the outlet 12. Both the inner and outer cooling water flows in a spiral shape, ensuring that both the outer jacket 3 and the inner jacket 2 are fully cooled, resulting in uniform heat transfer and better cooling effect.

[0032] The flow guide 4 comprises a spiral flow guide ring 41, a planar flow guide ring 42 and a water baffle 43, the planar flow guide ring 42 is arranged at the front end of the spiral flow guide ring 41, and the water baffle 43 is arranged on the front side of the planar flow guide ring 42; the outer side of the spiral flow guide ring 41 is provided with an outer spiral groove 411 with a notch facing outward, the inner side of the outer sleeve 3 closes the notch of the outer spiral groove 411 to form an outer spiral water channel 52; the inner side of the spiral flow guide ring 41 is provided with an inner spiral groove 412 with a notch facing inward, the outer side of the inner sleeve 2 closes the notch of the inner spiral groove 412 to form an inner spiral water channel 53; the edge of the water baffle 43 is tightly matched with the inner wall of the front end of the internal cavity 5; the rear water chamber 51 is located at the rear side of the spiral flow guide ring 41, and the front water chamber 54 is located at the front side of the planar flow guide ring 42; the planar flow guide ring 42 separates the front water chamber 54 from the outer spiral water channel 52 and the inner spiral water channel 53; the planar flow guide ring 42 is provided with a first through hole 422 and a second through hole 421, the water baffle 43 separates the first through hole 422 from the second through hole 421, the front end of the outer spiral water channel 52 is communicated with the front water chamber 54 through the first through hole 422, and the front end of the inner spiral water channel 53 is communicated with the front water chamber 54 through the second through hole 421.

[0033] In the case that the water inlet 11 is communicated with the rear end of the inner spiral water channel 53 through the water inlet pipe 6, the cooling water enters the water inlet 11 on the flange 1, first passes through the inner spiral water channel 53, and then enters the front water chamber 54 through the second through hole 421 after the cooling water passes between the outer side of the inner sleeve 2 and the inner side of the spiral flow guide ring 41 to cool the inner sleeve 2, flows through the front water chamber 54 for one round to cool the front end of the tuyere sleeve, and then enters the outer spiral water channel 52 through the first through hole 422, so that the cooling water passes between the inner side of the outer sleeve 3 and the outer side of the spiral flow guide ring 41 to cool the outer sleeve 3, and finally is discharged outside the tuyere sleeve through the water outlet 12 on the flange 1.

[0034] The outer spiral groove 411 and the inner spiral groove 412 are arranged alternately and have the same rotation direction.

[0035] Generally, the outer edge of the planar flow guide ring 42 is tightly matched with the inner side of the outer sleeve 3, and the inner edge of the planar flow guide ring 42 is tightly matched with the outer side of the inner sleeve 2.

[0036] The cross-sectional shape of the outer spiral groove 411 and the inner spiral groove 412 is V-shaped. The materials of the spiral flow guide ring 41, the planar flow guide ring 42 and the water baffle 43 are all carbon steel.

[0037] The opening cross-sectional area of the water inlet pipe 6 gradually decreases from the rear to the front. The rear end opening of the water inlet pipe 6 is a circular opening, and the rear end of the water inlet pipe 6 is connected to the flange 1. The front end opening of the water inlet pipe 6 is an oval opening, and the front end of the water inlet pipe 6 is connected to the rear end of the spiral flow guide ring 41. The material of the water inlet pipe 6 is carbon steel.

[0038] The front end of the inner sleeve 2 is connected to the front end of the outer sleeve 3, and the rear end of the outer sleeve 3 and the rear end of the inner sleeve 2 are both fixedly connected to the flange 1. The front end of the inner sleeve 2 is connected to the front end of the outer sleeve 3 through a first annular weld 8, the rear end of the outer sleeve 3 is connected to the flange 1 through a second annular weld 9, and the rear end of the inner sleeve 2 is connected to the flange 1 through a third annular weld 10. The materials of the inner sleeve 2, the outer sleeve 3, and the flange 1 are copper, copper alloy, or steel.

[0039] Embodiment 2

[0040] As shown in the drawings, the difference between the inner and outer spiral blast furnace tuyere small sleeve in this embodiment and that in Embodiment 1 is that: Figure 4 The water inlet 11 is connected to the rear end of the outer spiral water channel 52 through the water inlet pipe 6, the front end of the outer spiral water channel 52 is connected to the front end of the inner spiral water channel 53 through the front water chamber 54, the rear end of the inner spiral water channel 53 is connected to the rear water chamber 51, and the rear water chamber 51 is connected to the water outlet 12. In the case where the water inlet 11 is connected to the rear end of the outer spiral water channel 52 through the water inlet pipe 6, the cooling water enters the outer spiral water channel 52 from the water inlet 11 through the water inlet pipe 6, flows spirally in the outer spiral water channel 52, is then introduced into the inner spiral water channel 53 through the front water chamber 54, flows spirally in the inner spiral water channel 53, and is finally discharged through the rear water chamber 51 and the water outlet 12.

[0041] In the case where the water inlet 11 is connected to the rear end of the outer spiral water channel 52 through the water inlet pipe 6, the cooling water enters from the water inlet 11 on the flange 1, first passes through the outer spiral water channel 52, cools the outer sleeve 3 through the space between the inner side of the outer sleeve 3 and the outer side of the spiral flow guide ring 41, then enters the front water chamber 54 through the first through hole 422, flows around the front end of the tuyere small sleeve in the front water chamber 54, cools the front end of the tuyere small sleeve, then enters the inner spiral water channel 53 through the second through hole 421, cools the outer wall of the inner sleeve 2 through the space between the outer side of the inner sleeve 2 and the inner side of the spiral flow guide ring 41, and finally is discharged from the tuyere small sleeve through the water outlet 12 on the flange 1.

[0042]

[0043] ​In addition, it should be noted that the specific embodiments described in the specification, the name of each part, etc. can be different, and any equivalent or simple change made in accordance with the structure, features and principles described in the utility model patent concept is included in the protection scope of the utility model patent. The skilled in the art to which the present application belongs can make various modifications or supplements or adopt similar ways to replace the described specific embodiments, as long as it does not deviate from the structure of the utility model or beyond the scope defined in the claims, which shall belong to the protection scope of the utility model.

Claims

1. An inner-outer spiral blast furnace tuyere small sleeve, comprising a flange, an inner sleeve, an outer sleeve and a flow director, the outer sleeve is sleeved outside the inner sleeve, the outer sleeve, the inner sleeve and the flange enclose an internal cavity, and the flow director is arranged in the internal cavity; a water inlet and a water outlet are arranged on the flange, characterized in that: The flow director separates the internal cavity into a rear water chamber, an outer spiral water channel, an inner spiral water channel and a front water chamber, and the outer spiral water channel is outside the inner spiral water channel, the rear water chamber is at the rear side of the outer spiral water channel and the inner spiral water channel, and the front water chamber is at the front side of the outer spiral water channel and the inner spiral water channel; ​ The flow director comprises a spiral flow director ring, a planar flow director ring and a water baffle, the planar flow director ring is arranged at the front end of the spiral flow director ring, and the water baffle is arranged on the front side of the planar flow director ring; an outer spiral groove with a notch facing outward is arranged on the outer side of the spiral flow director ring, and the inner side of the outer sleeve closes the notch of the outer spiral groove to form the outer spiral water channel; an inner spiral groove with a notch facing inward is arranged on the inner side of the spiral flow director ring, and the outer side of the inner sleeve closes the notch of the inner spiral groove to form the inner spiral water channel; The water inlet is communicated with the rear end of the inner spiral water channel through a water inlet pipe, the front end of the inner spiral water channel is communicated with the front end of the outer spiral water channel through the front water chamber, the rear end of the outer spiral water channel is communicated with the rear water chamber, and the rear water chamber is communicated with the water outlet; or the water inlet is communicated with the rear end of the outer spiral water channel through a water inlet pipe, the front end of the outer spiral water channel is communicated with the front end of the inner spiral water channel through the front water chamber, the rear end of the inner spiral water channel is communicated with the rear water chamber, and the rear water chamber is communicated with the water outlet.

2. The internal-external spiral blast furnace nozzle bushing of claim 1, wherein: The edge of the water baffle is tightly matched with the inner wall of the front end of the internal cavity; the rear water chamber is at the rear side of the spiral flow director ring, and the front water chamber is at the front side of the planar flow director ring; the planar flow director ring separates the front water chamber from the outer spiral water channel and the inner spiral water channel; the planar flow director ring is provided with a first through hole and a second through hole, the water baffle separates the first through hole from the second through hole, the front end of the outer spiral water channel is communicated with the front water chamber through the first through hole, and the front end of the inner spiral water channel is communicated with the front water chamber through the second through hole.

3. The internal-external spiral blast furnace nozzle bushing of claim 2, wherein: The outer edge of the planar flow director ring is tightly matched with the inner side of the outer sleeve, and the inner edge of the planar flow director ring is tightly matched with the outer side of the inner sleeve.

4. The internal-external spiral blast furnace nozzle bushing of claim 2, wherein: The outer spiral groove and the inner spiral groove are arranged alternately and have the same rotation direction.

5. The internal-external spiral blast furnace nozzle bushing of claim 4, wherein: The cross-sectional shape of the outer spiral groove and the inner spiral groove is V-shaped or U-shaped.

6. The internal-external spiral blast furnace nozzle bushing of claim 5, wherein: The materials of the spiral flow director ring, the planar flow director ring and the water baffle are steel.

7. The internal-external spiral blast furnace nozzle bushing of claim 1 wherein: The opening cross-sectional area of the water inlet pipe gradually decreases from the rear to the front.

8. The internal-external spiral blast furnace nozzle bushing of claim 7, wherein: The rear end of the water inlet pipe is circularly opened, and the rear end of the water inlet pipe is connected with the flange; the front end of the water inlet pipe is elliptically opened, and the front end of the water inlet pipe is connected with the rear end of the spiral flow director ring.

9. The double spiral furnace bushing as claimed in claim 8, wherein: The material of the water inlet pipe is steel.

10. The inner and outer spiral blast furnace tuyere small sleeve according to claim 1, characterized in that: The front end of the inner sleeve is connected with the front end of the outer sleeve, and the rear end of the outer sleeve and the rear end of the inner sleeve are fixedly connected with the flange; The front end of the inner sleeve is connected with the front end of the outer sleeve through a first annular weld, the rear end of the outer sleeve is connected with the flange through a second annular weld, and the rear end of the inner sleeve is connected with the flange through a third annular weld.

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