CN214747247U

CN214747247U - Multilayer furnace cover for electric smelting magnesia furnace

Info

Publication number: CN214747247U
Application number: CN202023203539.7U
Authority: CN
Inventors: 张忠君; 王明夺; 刘士军; 金宁
Original assignee: Haicheng Jungang Mid Range Magnesia Co ltd
Current assignee: Haicheng Jungang Mid Range Magnesia Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-11-16
Anticipated expiration: 2030-12-28

Abstract

The utility model provides a multilayer bell for fused magnesia furnace, including outer lid shell, stopper, draught fan, induced duct and porous prefab. The utility model avoids the unorganized discharge in the production process of fused magnesia through the multi-layer furnace cover, and plays a role in environmental protection; the possibility of 'electric connection' between electrodes is avoided through the three layers of porous prefabricated parts; the high-temperature strength of the castable refractory material is enhanced through the porous steel plate and the anchoring piece on the porous prefabricated piece; the aperture of the porous steel plate is larger than that of the fire-resistant layer, so that the danger caused by the 'connection' of the porous steel plate and the electrode is avoided; the hook can be used for facilitating safe and convenient construction.

Description

Multilayer furnace cover for electric smelting magnesia furnace

Technical Field

The utility model relates to an electric smelting magnesia kiln technical field, concretely relates to electric smelting magnesia is multilayer bell for stove.

Background

The fused magnesia has the advantages of good fire resistance, high density, high purity and the like, and is widely applied to the fields of new metallurgy technology, aerospace high temperature resistance and other ultrahigh temperatures. For example, the fused magnesia used in the metallurgical field has huge demand, is mainly used for refractory materials for furnace linings of steel ladles, converters and the like, has the annual demand of more than millions of tons at home and abroad, and is generally produced by taking magnesite as a main raw material and adopting a graphite electrode alternating current electric smelting mode.

However, the production process of fused magnesite at home and abroad is often accompanied with the generation of a large amount of carbon dioxide gas, so that the unorganized discharge condition in the production process of the fused magnesite is serious, and the situations of furnace burden splashing and electric shock of a multiphase electrode are easily caused. For years, related scientific research and production technicians at home and abroad in the situation are extensively researched and developed and pilot-scale tests, for example, the mode of fixing the heating electrode in a hydraulic lifting mode is adopted, so that the occurrence probability of electric shock is reduced; such as the problem of inorganization discharge by using a metal furnace cover. However, the production process of the fused magnesite by the electric melting method covers the electrical technology, the material technology, the mechanical technology, the environmental protection technology and the like, and the system and the process are relatively complex and have not been generally solved.

So in order to better solve the carbon dioxide unorganized emission that exists in the fused magnesia production process and the furnace charge that causes by the production of a large amount of carbon dioxide gas splash and the condition that heterogeneous electrode electrocuted, the utility model discloses the multilayer bell device for fused magnesia stove realizes the rational production of fused magnesia through designing.

SUMMERY OF THE UTILITY MODEL

In order to solve the prior art not enough, the utility model provides a convenient operation safety, environment friendly multilayer bell for fused magnesia furnace.

In order to achieve the above object, the utility model discloses a following technical scheme realizes:

the utility model provides an electric smelting is multilayer bell lid for magnesite clinker furnace which characterized in that includes: the outer cover shell is of a cylindrical structure, the height of the outer cover shell is 500-800mm, three limit blocks are annularly arranged at positions with the heights of 300mm, 450mm and 600mm on the inner wall of the outer cover shell at equal intervals, preformed holes penetrating through the outer cover shell are respectively arranged at the symmetric positions at the heights of 375mm and 475mm of the outer cover shell, two preformed holes on the left side are respectively connected with the air outlet ends of the induced air pipes, the air inlet ends of the two induced air pipes are connected with the induced draft fan, two preformed holes on the right side are respectively connected with the air outlet ends of the induced air pipes, the air inlet ends of the two induced air pipes are connected with the other induced draft fan, and a layer of multi-hole is arranged below each three limit blocks; the porous prefabricated member is provided with a porous steel plate, hooks, anchoring parts, a fire-resistant layer, steel plate round holes and fire-resistant layer round holes, the porous steel plate is annularly provided with three steel plate round holes at equal intervals, the diameter of each steel plate round hole is 150-200mm, the three hooks are annularly provided at equal intervals on the porous steel plate, the porous steel plate is connected with the fire-resistant layer through 10-15 anchoring parts arranged at equal intervals below the porous steel plate, the fire-resistant layer is provided with three fire-resistant layer round holes, the fire-resistant layer round holes are overlapped with the steel plate round holes, and the diameter of each steel plate round hole is 50-100mm larger than that of the fire-resistant layer round hole.

The outer-layer cover shell is a GH1015 type or GH2018 type high-temperature-resistant steel plate with the thickness of 10-20 mm.

The limiting block is a GH1015 type or GH2018 type high-temperature-resistant steel block which is 30-50mm long, 30-50mm wide and 10-20mm high.

The porous steel plate, the hook and the anchoring piece are made of GH1015 type or GH2018 type high-temperature-resistant steel materials, and the thickness of the porous steel plate is 10-20 mm.

The refractory layer is made of magnesium refractory material and has a thickness of 30-50 mm.

Compared with the prior art, the beneficial effects of the utility model are that: 1) through the multi-layer furnace cover, the unorganized discharge in the production process of the fused magnesia is avoided, and the environment-friendly effect is achieved; 2) the possibility of 'electric connection' between electrodes is avoided through the three layers of porous prefabricated parts; 3) the high-temperature strength of the castable refractory material is enhanced through the porous steel plate and the anchoring piece on the porous prefabricated piece; 4) the aperture of the porous steel plate is larger than that of the fire-resistant layer, so that the danger caused by the 'connection' of the porous steel plate and the electrode is avoided; 5) the hook can be used for facilitating safe and convenient construction.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a top view of a porous preform in an embodiment of the present invention.

Fig. 3 is a cross-sectional view taken along line a-a of fig. 2.

In the figure: 1-outer cover shell, 2-limiting block, 3-induced draft fan, 4-induced draft tube, 5-porous prefabricated part, 51-porous steel plate, 52-hook, 53-anchoring part, 54-flame retardant coating, 55-steel plate round hole and 56-flame retardant coating round hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the embodiments of the present invention and the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

See fig. 1-fig. 3, the utility model relates to a multilayer bell lid embodiment structure schematic diagram for electric smelting magnesite clinker furnace, including outer lid shell 1, stopper 2, draught fan 3, induced duct 4 and porous prefab 5, outer lid shell 1 is cylindric structure, outer lid shell 1 height 800mm, at 1 inner wall height 300mm of outer lid shell, 450mm, three stopper 2 is established to 600 mm's position equidistance ring, respectively establish a preformed hole that link up outer lid shell 1 in the 375mm of outer lid shell 1 and the symmetric position of 475mm eminence, two preformed holes in the left side are connected with induced duct 4 end of giving vent to anger respectively, two induced duct 4 inlet ends are connected with a draught fan 3, two preformed holes in the right side are connected with induced duct 4 end of giving vent to anger respectively, two induced duct 4 inlet ends are connected with another draught fan 3, establish the porous prefab 5 of one deck below every three stopper 2. The outer cover shell 1 is a GH2018 type high-temperature-resistant steel plate with the thickness of 15 mm. The limiting block 2 is a GH2018 type high-temperature-resistant steel block with the length of 30mm, the width of 30mm and the height of 20 mm.

Be equipped with porous prefabricated member 5 porous steel plate 51, couple 52, anchor assembly 53, flame retardant coating 54, steel sheet round hole 55 and flame retardant coating round hole 56, three steel sheet round hole 55 is established to porous steel plate 51 equidistance ring, steel sheet round hole 55 diameter is 150mm, three couple 52 is established to the equidistance ring above the porous steel plate 51, 12 anchor assemblies 53 that porous steel plate 51 set up through following equidistance link to each other with flame retardant coating 54, be equipped with three flame retardant coating round hole 56 on the flame retardant coating 54, the flame retardant coating round hole 56 coincides with steel sheet round hole 55, and steel sheet round hole 55 is greater than flame retardant coating round hole 56 diameter by 50 mm. The porous steel plate 51, the hook 52 and the anchoring piece 53 are all made of GH2018 type high-temperature-resistant steel, and the thickness of the porous steel plate 51 is 10 mm. The refractory layer 54 is a magnesia refractory material and has a thickness of 30 mm.

The embodiment of the utility model provides a concrete operation mode as follows:

step one, completing the preparation process of a porous prefabricated part 5, wherein a porous steel plate 51 is arranged on the upper surface of the porous prefabricated part 5, 10 anchoring parts 53 are welded on the lower surface of the porous steel plate 51 at equal intervals, the thickness of a magnesium refractory layer 54 is 30mm, and 2 hooks 52 are welded on the porous steel plate 51 and used for construction and hoisting;

secondly, hoisting the porous prefabricated part 5 at the bottommost layer to the position of the limiting block 2 at the bottommost layer by using hoisting equipment through a hook 52, and connecting and limiting the porous prefabricated part and the limiting block through a bolt;

hoisting the porous prefabricated part 5 on the second layer at the bottom to the position of the second layer limiting block 2 by using the hook 52 at the bottom of the porous prefabricated part 5 by using hoisting equipment, and connecting and limiting the porous prefabricated part 5 and the second layer limiting block by using a bolt;

repeating the operations to ensure that the positions of the preformed holes on the side wall of the multi-layer furnace cover are kept consistent in the vertical direction; and finally, installing a graphite electrode, electrifying for production, and discharging the formed high-temperature gas and dust out of the furnace through the reserved hole, the induced draft tube 4 and the induced draft fan 3.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an electric smelting is multilayer bell lid for magnesite clinker furnace which characterized in that includes: an outer cover shell (1), a limiting block (2), a draught fan (3), a draught pipe (4) and a porous prefabricated part (5), the outer layer cover shell (1) is of a cylindrical structure, the height of the outer layer cover shell (1) is 500-800mm, three limit blocks (2) are annularly arranged at the positions with the heights of 300mm, 450mm and 600mm on the inner wall of the outer cover shell (1) at equal intervals, the method comprises the following steps that (1) reserved holes penetrating through an outer cover shell (1) are respectively arranged at the symmetrical positions at the 375mm and 475mm high positions of the outer cover shell (1), two reserved holes on the left side are respectively connected with the air outlet ends of air ducts (4), the air inlet ends of the two air ducts (4) are connected with an induced draft fan (3), two reserved holes on the right side are respectively connected with the air outlet ends of the air ducts (4), the air inlet ends of the two air ducts (4) are connected with the other induced draft fan (3), and a layer of porous prefabricated member (5) is arranged below each three limiting blocks (2);

the porous prefabricated member (5) is provided with a porous steel plate (51), hooks (52), anchoring pieces (53), a fire-resistant layer (54), steel plate round holes (55) and fire-resistant layer round holes (56), the porous steel plate (51) is annularly provided with three steel plate round holes (55) at equal intervals, the diameter of the steel plate round hole (55) is 150-200mm, the three hooks (52) are annularly provided at equal intervals on the porous steel plate (51), the porous steel plate (51) is connected with the fire-resistant layer (54) through 10-15 anchoring pieces (53) arranged at equal intervals below, the fire-resistant layer (54) is provided with three fire-resistant layer round holes (56), the fire-resistant layer round holes (56) are superposed with the steel plate round holes (55), and the diameter of the steel plate round holes (55) is 50-100mm larger than that of the fire-resistant layer round holes (56).

2. The multi-layer furnace cover for the fused magnesia furnace according to claim 1, wherein the outer cover shell (1) is a GH1015 type or GH2018 type high temperature resistant steel plate with the thickness of 10-20 mm.

3. The multi-layer furnace cover for the fused magnesia furnace as claimed in claim 1, wherein the limiting block (2) is a GH1015 type or GH2018 type high temperature resistant steel block with the length of 30-50mm, the width of 30-50mm and the height of 10-20 mm.

4. The multi-layer furnace cover for the fused magnesia furnace according to claim 2, wherein the porous steel plate (51), the hook (52) and the anchoring piece (53) are made of GH1015 type or GH2018 type high temperature resistant steel, and the thickness of the porous steel plate (51) is 10-20 mm.

5. The multi-layer furnace cover for the fused magnesia furnace according to claim 2, wherein the refractory layer (54) is made of a magnesia refractory material and has a thickness of 30-50 mm.