CN217209844U - Hot-blast stove structure with high heat-insulating property - Google Patents

Abstract

The utility model provides a hot-blast furnace structure with high heat-proof quality, includes inlayer insulating brick, inlayer insulating brick form the furnace body through the cyclic annular masonry of multilayer, be equipped with outer insulating brick in inlayer insulating brick outside, the outside of outer insulating brick is equipped with the heat-insulating shield, the outside cladding of heat-insulating shield has outside steel sheet. The furnace body is provided with a furnace tail reducing joint at one end of the furnace tail. The inner layer heat insulation brick is made of anti-stripping high-alumina bricks; the outer layer heat insulation brick is a mullite light-weight brick; the heat-insulating plate is a nano heat-insulating plate. This novel adopt above-mentioned structure, can promote the thermal-insulated ability of heat preservation of furnace body, reduce heat energy and scatter and disappear and improve the thermal efficiency of burning, avoid the outer steel sheet deformation problem that leads to of heat exorbitantly simultaneously.

Description

Hot-blast stove structure with high heat-insulating property

Technical Field

The utility model relates to a hot-blast furnace field, specific is a hot-blast furnace structure with high heat-proof quality.

Background

The wall structure of the existing hot blast stove consists of a fire-resistant layer and a heat-insulating layer, and the wall structure is different from a common building wall body, is built by adopting a special fire-resistant material and needs to bear complex operation working conditions such as high temperature and the like. The existing hot blast stove consists of knife edge refractory bricks with the thickness of 117mm and a heat insulation board with the thickness of 24mm, and the outermost layer is a steel plate with the thickness of 12mm as a sealing layer. The furnace tail is formed by welding special-shaped reducing joints with the eccentricity of 200 mm.

The disadvantages of this technique are:

1. only one deck and too single thin are able to bear or endure to the thick edge firebrick of 117mm, furnace burns for a long time and causes firebrick high temperature, the heat is direct to the thick heat insulating board of 24mm by resistant firebrick transmission, transmit to outer 12mm thick steel sheet by the thick heat insulating board of 24mm again, but because the furnace body is external to be made the asbestos of 100mm thick and keeps warm, the heat can't distribute away, hot-blast furnace long-time running causes the temperature between flame retardant coating to the insulating layer to be higher and higher, and then the steel sheet that leads to the sealing layer warp or splits because of the high temperature, finally cause the interior firebrick of stove to appear the crack and collapse.

2. Because the heat of the existing hot blast stove is too large in dissipation, the environment temperature of an operation room is severe due to the firstly dissipated heat, operation and maintenance of operators are inconvenient, and the combustion efficiency of the hot blast stove is low due to the heat dissipation.

3. The special-shaped variable-diameter joint at the furnace tail is eccentric by 200mm, and because the variable-diameter joint is short in length and thick in plate, the welding manufacturing and installation difficulty of the variable-diameter joint is too high, the installation is also troublesome, and the installation efficiency is low.

4. According to actual statistics, the hot blast stove is installed and used according to the current installation technology, overhaul needs to be carried out on the hot blast stove every 2-3 months, the overhaul time needs 7-10 days every time, and the overhaul needs 4 times in a year at least. There will be a 2000 ton reduction per year due to major repairs and at least 80 ten thousand maintenance costs per year.

Disclosure of Invention

The utility model aims to solve the technical problem that a hot-blast furnace structure with high heat-proof quality is provided, can promote the heat preservation thermal-insulated ability of furnace body, reduce heat energy and scatter and disappear and improve the thermal efficiency of burning, avoid the outer steel sheet deformation problem that leads to that looses of heat simultaneously.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: the utility model provides a hot-blast stove structure with high heat-proof quality, includes inlayer insulating brick, inlayer insulating brick form the furnace body through the annular building of multilayer, be equipped with outer insulating brick in inlayer insulating brick outside, outer insulating brick's outside is equipped with the heat-insulating shield, the outside cladding of heat-insulating shield has outside steel sheet.

In a preferred scheme, a furnace tail reducer union is arranged at one end of the furnace tail of the furnace body.

In the preferred scheme, the inner layer heat insulation brick is made of anti-stripping high-alumina bricks;

the outer layer heat insulation brick is a mullite light-weight brick;

the heat insulation plate is a nano heat insulation plate.

In a preferred scheme, corundum wear-resistant plastic materials are respectively filled at two ends of the furnace body, and an air inlet pipe is arranged in the corundum wear-resistant plastic material filled at one end.

In the preferred scheme, an annular gap is reserved between the heat insulation plate and the external steel plate, and a plurality of cooling heat exchange tubes are uniformly distributed in the gap.

In the preferred scheme, the outer wall of the cooling heat exchange tube is provided with fins, the fins are in contact with the outer wall of the heat insulation plate and the inner wall of the external steel plate, and the cooling heat exchange tube is supported and fixed.

The utility model provides a hot-blast furnace structure with high heat-proof quality through adopting above-mentioned structure, has following beneficial effect:

(1) the existing knife edge refractory working brick is replaced by an anti-stripping high-alumina brick and thickened, a common thermal insulation board is replaced by a nano thermal insulation board and thickened to improve the thermal insulation capability, a layer of mullite light-gathering brick is added after the anti-stripping high-alumina brick to further improve the thermal insulation capability, the temperature of an outermost steel plate is reduced, the steel plate cannot deform or break, and the normal and stable operation of the hot blast stove is ensured;

(2) due to the replacement and thickening treatment of materials, the heat loss is reduced, the temperature outside the furnace operating room is greatly reduced, the service life of equipment in the operating room is prolonged, the subsequent maintenance is convenient, and the combustion efficiency of the hot blast stove is improved due to the reduction of the heat loss;

(3) the special-shaped reducing joint at the furnace tail is changed into a concentric reducing joint, so that the welding and installation difficulty caused by the thickness and the length of the plate is reduced;

(4) after practical application, the hot blast stove is found to be greatly repaired from 4 times per year to 1 time per 5 years, the frequency of the large repair is reduced by 20 times compared with the original frequency, the maintenance cost is reduced by at least 20 times, the yield can be increased by 1 ten thousand tons compared with the original 5 years, and the economic benefit is obviously improved.

Drawings

The invention will be further explained with reference to the following figures and examples:

fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic sectional view of the present invention.

In the figure: the heat-insulating brick comprises an inner-layer heat-insulating brick 1, an outer-layer heat-insulating brick 2, a heat-insulating plate 3, an external steel plate 4, a furnace tail reducer union 5, a cooling heat exchange tube 6 and fins 7.

Detailed Description

As shown in fig. 1-2, a hot blast stove structure with high heat insulation performance comprises an inner layer heat insulation brick 1, wherein the inner layer heat insulation brick 1 is formed into a stove body through multi-layer annular masonry, an outer layer heat insulation brick 2 is arranged outside the inner layer heat insulation brick 1, a heat insulation plate 3 is arranged outside the outer layer heat insulation brick 2, and an outer steel plate 4 is wrapped outside the heat insulation plate 3.

In a preferable scheme, a furnace tail reducing joint 5 is arranged at one end of the furnace tail of the furnace body.

In a preferred scheme, the inner layer heat insulation brick 1 is made of an anti-stripping high-alumina brick with the thickness of 230 mm;

the outer layer heat insulation brick 2 is a mullite light-weight brick with the thickness of 117 mm;

the heat insulation plate 3 is a nano heat insulation plate with the thickness of 40 mm;

the outer steel plate 4 has a thickness of 12 mm.

In the preferred scheme, corundum wear-resistant plastic materials are respectively filled at two ends of the furnace body, an air inlet pipe is arranged in the corundum wear-resistant plastic materials filled at one end, and a furnace tail reducer union 5 is formed at the other end.

In the preferred scheme, an annular gap is reserved between the heat insulation plate 3 and the external steel plate 4, and a plurality of cooling heat exchange tubes 6 are uniformly distributed in the gap.

In the preferred scheme, 6 outer walls of cooling heat exchange tubes on be equipped with fin 7, contact between fin 7 and 3 outer walls of heat-insulating shield and the 4 inner walls of outside steel sheet realizes that the support of cooling heat exchange tubes 6 is fixed.

In the above-mentioned structure that this application adopted, through choosing for use anti-stripping high-alumina brick to replace the edge clay brick among the prior art, make its refractoriness higher to it is high to have increased the refractoriness under load of inlayer firebrick, and anti-stripping nature, heat conductivity, mechanical strength, anti chemical attack performance.

The mullite light-weight heat-insulating brick is further added to serve as a heat-insulating layer, and the mullite light-weight heat-insulating brick has the service performances of high-temperature structural strength, good volume stability, excellent thermal shock stability, high use temperature, small heat conductivity coefficient and low change rate of a re-firing line, so that the service time of the hot-blast stove is prolonged.

The original common heat insulation board is replaced by a nano heat insulation board with the thickness of 40mm, the nano heat insulation board is a novel super heat insulation material developed by utilizing a nano technology, and is formed by overlapping and clamping nano porous structural materials with excellent high-temperature barrier property, and a composite reflection type heat insulation board is prepared by a special process;

because of the special structural design of the nanometer heat insulation board product, the nanometer heat insulation board can effectively prevent three heat transfer modes of heat conduction, convection heat transfer and radiation heat transfer, so that the hot blast stove has super heat insulation performance, the heat conductivity coefficient of the hot blast stove is lower than that of the traditional heat insulation material, the heat insulation effect can be improved by 2-5 times compared with the traditional heat insulation material, and the thickness of the nanometer heat insulation board is thinner under the same thermal engineering condition.

The structure that this application supplied and opened greatly reduced the hot-blast furnace heat and lost, actually measured outmost temperature can reach 55 ℃ at the lowest, and outmost steel casing basically can not receive the temperature influence and produce deformation. And the special-shaped reducing joint at the furnace tail is changed into a concentric reducing joint, so that the welding and installation difficulty is greatly reduced, the installation efficiency is improved, and the installation progress of the hot blast furnace is accelerated.

On the basis, select to add round cooling heat exchange tube 6 between heat-insulating shield 3 and outside steel sheet 4, wherein will be used for carrying out the heat transfer with the outer scattered heat energy that still exists and collect for avoid the discomfort that the high temperature caused in the operational environment, and avoid concentrating the damage fracture that generates heat and lead to in some department on the outside steel sheet 4 that leads to because of the damaged problem of some department of furnace body.

Claims (6)

1. The utility model provides a hot-blast furnace structure with high heat-proof quality which characterized in that: including inlayer insulating brick (1), inlayer insulating brick (1) form the furnace body through the cyclic annular masonry of multilayer, be equipped with outer insulating brick (2) in inlayer insulating brick (1) outside, the outside of outer insulating brick (2) is equipped with heat-insulating shield (3), the outside cladding of heat-insulating shield (3) has outside steel sheet (4).

2. The structure of the hot blast stove with high heat insulating property of claim 1, wherein: the furnace body is provided with a furnace tail reducer union (5) at one end of the furnace tail.

3. The structure of a hot blast stove with high heat insulating property according to claim 1, wherein: the inner layer heat insulation brick (1) is made of anti-stripping high-alumina bricks;

the outer layer heat insulation brick (2) is a mullite light-weight brick;

the heat insulation plate (3) is a nano heat insulation plate.

4. The structure of the hot blast stove with high heat insulating property of claim 1, wherein: the two ends of the furnace body are respectively filled with corundum wear-resistant plastic materials, and an air inlet pipe is arranged in the corundum wear-resistant plastic materials filled at one end.

5. The structure of the hot blast stove with high heat insulating property of claim 1, wherein: an annular gap is reserved between the heat insulation plate (3) and the external steel plate (4), and a plurality of cooling heat exchange tubes (6) are uniformly distributed in the gap.

6. The structure of a hot blast stove with high heat insulating property according to claim 5, wherein: the outer wall of the cooling heat exchange tube (6) is provided with fins (7), and the fins (7) are in contact with the outer wall of the heat insulation plate (3) and the inner wall of the external steel plate (4), so that the cooling heat exchange tube (6) is supported and fixed.

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