CN217077663U - Cracking-proof shell for top-combustion type hot-blast stove - Google Patents
Cracking-proof shell for top-combustion type hot-blast stove Download PDFInfo
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- CN217077663U CN217077663U CN202220558166.5U CN202220558166U CN217077663U CN 217077663 U CN217077663 U CN 217077663U CN 202220558166 U CN202220558166 U CN 202220558166U CN 217077663 U CN217077663 U CN 217077663U
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Abstract
The utility model relates to a top combustion formula is cracking-proof shell for hot-blast furnace, can effectively solve and prevent that the stove outer covering from bursting, reduce the formation of nitric acid liquid corrosive medium, increase of heat efficiency and benefit, increase of service life's problem, including former stove body shell, the outer cover of mutually opening concentric cover is equipped with outer casing outward, constitute double-deck composite structure, it has the cotton heat preservation cotton of refractory fiber to fill between former stove body shell and the outer casing, outer casing is made the hollow body unanimous with former stove body shell shape by the steel sheet welding that prevents hydrogen from causing the fracture, the steel sheet connects the welding department outside and is single face V type form, single face V type form connects through steel sheet welding rod welding dress firm connection, outer casing constitutes a body structure with former stove body shell lower part welded seal. The utility model discloses simple structure, novel unique, easy production, to former top combustion formula hot-blast furnace shell transformation easily, excellent in use effect, longe-lived, energy-concerving and environment-protective, have apparent economy and social.
Description
Technical Field
The utility model relates to a hot-blast furnace, especially a top combustion formula is cracking-proof shell for hot-blast furnace.
Background
The furnace shells of all the existing small cap top combustion type hot blast furnaces are shells made of Q345C, and no matter the pressure, the wind temperature and the nitrogen oxide emission are high or low, one example of the material of the furnace shells is not transferred from steel for common structures to steel for acid-resistant and pressure-resistant containers. The furnace shell of the hot blast furnace is seriously cracked, and great potential safety hazard exists. The optimization and modification of the hot blast stoves in use under the conditions of no production stop and no influence on the production capacity are urgent. The steel for the common structure has the defects of welding pores, hot brittleness, welding defects and the like, the steel permeates into the furnace shell structure from micro cracks after acid radicals are formed by high pressure and nitric oxide, the strength of welding seams is reduced, when the welding strength is reduced to the extent that the high pressure action cannot be resisted, the safety accident that the furnace shell explodes and jumps can occur, and at present, 6 to 10 cases of the whole explosion and flying of the furnace shell exist. The 2500-plus-3200 m3 blast furnace matched hot blast furnaces have two examples, all of which are sixty-seven-ten meters with integral furnace shells flying, are of external combustion type and internal combustion type, have the constraint stress smaller than the top combustion type with complex furnace shell shape in the pressure, air supply temperature and machining, have the constraint stress, because the external combustion type hot blast furnaces and the internal combustion type hot blast furnaces are designed to have higher heights, the diameter of the furnace shells is small and is within 10 meters, the furnace shells are correspondingly thinner, the constraint stress is small, the large top combustion type hot blast furnace has the requirement of saving materials for short and fat, the maximum diameter is 13.5 meters, the air supply pressure is increased by 4.5-5.5 kilograms from the original conventional 4.3 kilograms, the thickness of the furnace shells must be increased while the diameter and the pressure of the furnace shells are increased, the welding difficulty and the constraint stress, the machining stress and the welding stress are increased, the pressure of the large top combustion type hot blast furnace is 1-1.5 kilograms from the pressure of the large internal combustion type hot blast furnace and the external combustion type, one hot blast stove of a certain iron and steel company has cracks up to 2300-3500, and the furnace shell strength is reduced in a certain period of time due to long-time high pressure and acid radical corrosion, so that serious potential safety hazards exist. Even if acid radical corrosion does not exist, the intensity of the welding seam is also weakened by the oxidation of external air to the cracking of the welding seam of the furnace shell, the air temperature is 30-60 ℃ higher than 1280-1310 ℃ which is increased by 1250 ℃ in the external combustion type and the internal combustion type, and certainly, the nitrogen oxide is also higher than the nitrogen oxide in the external combustion type and the internal combustion type, and the stress generated by the furnace shell is very large. And the original furnace shell has poor heat-insulating effect and short service life, and influences the heat efficiency and the benefit of use, so the improvement and innovation on the furnace shell are imperative.
SUMMERY OF THE UTILITY MODEL
In view of the above situation, in order to overcome the defects of the prior art, the utility model aims to provide a top combustion type hot blast stove is with preventing the shell that ftractures, can effectively solve and prevent the stove outer covering from bursting, reduces the formation of nitric acid liquid corrosion medium, increases thermal efficiency and benefit, increase of service life's problem.
The technical scheme of the utility model provides a, a top combustion formula is cracking-proof shell for hot-blast furnace, including former furnace body shell, former furnace body shell is opened the concentric cover outward and is equipped with outer casing mutually, constitutes double-deck composite structure, it has the cotton heat preservation of refractory fiber cotton to fill between former furnace body shell and the outer casing, outer casing is made the hollow body unanimous with former furnace body shell shape by the steel sheet welding that prevents hydrogen from causing the fracture, the steel sheet connects the welding department outside and is single face V type form, single face V type form connects and welds dress firm connection through the steel sheet welding rod, outer casing constitutes a body structure with former furnace body shell lower part welded seal.
The utility model discloses simple structure, novel unique, easy production, to former top combustion formula hot-blast furnace shell transformation easily, excellent in use effect, longe-lived, energy-concerving and environment-protective, have apparent economy and social.
Drawings
Fig. 1 is a front view of the structure of the present invention.
Fig. 2 is a view from a-a of fig. 1 according to the present invention.
Fig. 3 is a schematic view (enlarged) of the welding structure of the outer shell of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
Shown by fig. 1-3, the utility model relates to a top combustion formula shell of preventing ftractureing for hot-blast furnace, including former furnace body shell, former furnace body shell 1 is outer to be opened the concentric cover mutually and is equipped with outer casing 2, constitute double-deck composite structure, it has cotton 3 that keeps warm to fill the refractory fiber between former furnace body shell 1 and the outer casing 2, outer casing 2 is made the hollow body unanimous with former furnace body shell shape by the steel sheet welding that prevents hydrogen from causing the fracture, steel sheet joint welding department outside 2-2 is single face V type form 5, single face V type form 5 connects and welds through steel sheet welding rod 4 and adorns firm connection, outer casing 2 constitutes an organic whole structure with former furnace body shell 1 lower part welded seal.
The distance between the outer wall of the original furnace body shell 1 and the inner wall of the outer shell 2 is 20-150 mm.
The thickness of the refractory cellucotton heat-insulating cotton 3 is 20-150mm, so that the heat dissipation loss of the outer shell 2 is reduced, the fuel is saved, and the purposes of energy conservation and high efficiency are achieved.
The outer shell 2 is a Q345R steel plate or a Q345R (HIC) steel plate, and the thickness is designed to be 20-60mm according to the diameters of different parts and different air supply pressures.
When refractory cellucotton heat preservation cotton 3 is filled between the outer shell 2 and the original furnace body shell 1, the outer shell 2 adopts a Q345C/B steel plate or a Q345R (HIC) steel plate, and the thickness of the outer shell 2 is designed to be 20-60mm according to the diameters of different parts and different air supply pressures.
When the cracking-proof shell for the top-combustion type hot blast stove is filled between the outer shell 2 and the original stove body shell 1 for heat preservation, the thickness of the steel plate of the outer shell 2 is 1-3 mm.
The connecting blocks 6 are spot-welded on two sides of a welding seam of the inner surface 2-1 of the outer shell 2, and the two end surfaces of a steel plate welding position are fixedly connected together through spot welding, so that surfacing welding is facilitated.
The connecting block is a strip-shaped steel plate which is made of steel plates and has the thickness of 6mm and the width of 10 mm.
Can see by above-mentioned structure, the utility model discloses both be suitable for and reform transform existing hot-blast furnace shell, still be applicable to the restoration of fragile hot-blast furnace shell simultaneously and newly-built hot-blast furnace shell uses, and outer casing 2 and former furnace body shell 1 fill during refractory fiber cotton heat preservation cotton 3, former furnace body shell 1 becomes the anticorrosive casing of bearing pressure-bearing overweight by the bearing pressure-bearing, and the shell 2 of increase then becomes the bearing pressure-bearing stove outer covering after former casing 1 damages.
When the refractory fiber cotton heat preservation cotton 3 is filled between the outer shell 2 and the original furnace body shell 1, the temperature of the original furnace body shell 1 is preserved at the temperature of 150-300 ℃, and the situation that condensed water is continuously formed when the temperature of the high temperature in the furnace and the temperature of the original furnace body shell 1 is lower than 100 ℃ and is combined with high-temperature nitrogen oxide in the furnace to form a corrosion medium corrosion welding line and a furnace shell is avoided.
When a newly built top combustion type or used top combustion type hot blast stove shell adopts a Q345C/B steel plate, the temperature of the Q345C/B original stove body shell 1 is ensured to be kept between 150-plus-150 mm by filling refractory fiber cotton heat-preservation cotton between the outer layer shells 2 of 1-3mm outside the original stove body shell 1, and the formation of condensed water and high-temperature nitrogen oxide in the stove to form corrosion medium corrosion welding seams and the stove shell when the temperature of the stove and the original stove body shell 1 is lower than 100 ℃ is avoided.
When a newly built top combustion type or used top combustion type hot blast stove shell adopts a Q345C/B steel plate, the heat preservation of the refractory fiber cotton heat preservation cotton 320-150mm is filled between the outer shell 2 which is added with 1-3mm outside the original stove shell 1, and the damage degree of the original stove shell 1 can not be observed because the bearing pressure-bearing steel original stove shell 1 is completely sealed by the outer refractory fiber cotton heat preservation cotton 3 and the outer shell 2, therefore, long-term external temperature measurement monitoring must be established, and the occurrence of serious stove shell accidents is avoided.
By the above, the utility model discloses an increase the outer casing that the one deck is concentric to be spaced apart in former stove body shell 1's outside, it has the cotton 3 that keeps warm of refractory fibre cotton to fill between two-layer, is favorable to very much keeping warm, the increasing the thermal efficiency. Meanwhile, the specially-made outer shell is additionally arranged, so that the cracking and explosion flying of the furnace shell are prevented, the formation of corrosive medium nitric acid is avoided, the continuous penetration corrosion damage of the welding seam and the cracking of the furnace shell is avoided, the service life is greatly prolonged, the cost is saved, and the economic and social benefits are very obvious.
The high-pressure hot blast stove of the utility model selects the pressure vessel steel Q345R and Q345(HIC), and the acid-proof steel is welded for use. The high-pressure welding method can meet the requirement of high pressure, and because the product is subjected to hydrogen cracking test when leaving a factory, no air holes, thermal brittleness and welding flaws exist after welding, the product has the characteristic of acid resistance, and the welding strength cannot be weakened even if acid radical corrosion exists. As the test before delivery shows that the furnace shell is resistant to hydrogen cracking, has no defects of cracking and the like, and is also resistant to oxides in air to maintain the weld joint strength of the furnace shell, the hot blast stove with high pressure, high air temperature and nitrogen oxide emission and corrosion is provided, except for selecting Q345R and Q345(HIC) steel plates for welding, the measure adopted for the existing large-scale high air temperature and high air pressure top combustion hot blast stove is to paste a layer of Q34RQ345RHIC steel plate furnace shell with certain thickness on the basis of external existing steel for common structures, and the hidden danger of explosion and flying of the furnace shell is thoroughly solved under the condition of not stopping production and cutting the furnace shell.
A Q345R steel plate is repeatedly designed and welded on the surface layer of the furnace shell in the high-wind-temperature high-pressure area above the furnace shell with a crack area of the original hot-blast furnace shell after detection, the thickness of the steel plate is 20-40 mm and locally 60mm according to the air supply pressure and the diameter of the hot-blast furnace, single-double-sided grooves are adopted among the welding seams of the steel plate to be in a single-double-sided V-shaped shape, corresponding welding rods are adopted to fully pack the welding seams in a single direction and a double direction, a layer of refractory fiber cotton is sandwiched between the new furnace shell and the old furnace shell, and the thickness of the fiber cotton is 60-100 mm. In the welding process of the Q345R steel plate, weld joint hot brittleness, weld joint air holes, weld joint flaws and cracking cracks can not occur. If a high-pressure high-air-temperature hot blast stove is newly built, a Q345R (HIC) steel plate is adopted to manufacture and install a stove shell, and after the stove shell is welded, weld seam flaw detection and stress elimination treatment are carried out.
Experiments and practices prove that the utility model discloses can solve several problems:
1. the cracking state of the base metal of the original furnace shell steel plate and the cracking state of the welding line are maintained and are not continuously expanded, so that the furnace shell is prevented from being torn or exploded due to the fact that the corrosion strength of the original welding line is reduced under the high-pressure high-air-temperature state.
2. The main function of adding a layer of fiber cotton between the new and old steel plates is to implement heat preservation on the original furnace shell, namely the temperature of the original furnace shell is increased from the original temperature of less than 100 ℃ to 150-300 ℃, when the temperature of the furnace shell is less than 100 ℃, condensed water can be formed on the inner surface of the furnace shell, and nitrogen oxide can be contacted with the condensed water to generate a nitrate ion aqueous solution, so that a corrosive medium is formed and can permeate into weld pores, cracks and weld cracks to cause the reduction of the strength of the weld, even cause the explosion of the furnace shell to fly away. Therefore, the heat preservation is to increase the temperature of the furnace shell to be more than 150-300 ℃, but the temperature of the outer furnace shell is less than 70 ℃, so that the phenomenon that the high-temperature air in the original furnace shell reacts with the nitrogen oxide to generate condensed water nitrate ion aqueous solution to corrode the welding seam of the furnace shell is avoided.
3. Because no condensed water is generated, a large amount of nitrogen oxide generated by high wind temperature can not react with the condensed water to generate nitric acid, and the nitric acid can not continuously infiltrate and corrode the original cracked steel plate and the cracked welding line, thereby ensuring the stability and the long service life of the internal furnace shell structure.
4. The adoption of the external application of the cellucotton on the furnace shell can reduce the temperature of the furnace shell outside the hot blast furnace to be lower than 70 ℃ (the simulation of the internal temperature of the hot blast furnace being 1380 ℃, the external air temperature being 20 ℃ and the wind speed being 0, the silicon brick being 450+230 light silicon +114NG-0.8+100 fibrofelt +80 spraying +30 pipe shell calculation of the external temperature of the furnace shell being 295 ℃), greatly reduces the heat dissipation loss of the hot blast furnace, improves the heat efficiency, enables the hot blast furnace to be efficient and energy-saving at high wind temperature for a long time, can safely use the hot blast furnace at high pressure and high temperature and high efficiency without worry, and has very obvious economic and social benefits.
It should be noted that the above description is given only by way of example, and is used for illustrating the specific embodiments of the present invention, but not for limiting the protection scope of the present invention, and all the technical solutions essentially the same as the present invention made by adopting equivalent and equivalent replacing means all belong to the protection scope of the present invention.
Claims (7)
1. The utility model provides a top combustion formula is cracking-proof shell for hot-blast furnace, including former furnace body shell, characterized by, former furnace body shell (1) outer looks open the concentric cover and is equipped with outer casing (2) mutually, constitute double-deck composite structure, it has fire-resistant fiber cotton heat preservation cotton (3) to fill between former furnace body shell (1) and outer casing (2), outer casing (2) are welded by the steel sheet that prevents hydrogen induced cracking and are made into the hollow body that is unanimous with former furnace body shell shape, steel sheet joint welding department outside (2-2) are single face V type form (5), single face V type form (5) connect through steel sheet welding rod (4) welding firm connection, outer casing (2) and former furnace body shell (1) lower part welding seal constitute an organic whole structure.
2. The crack-proof shell for the top-fired hot-blast stove according to claim 1, wherein the distance between the outer wall of the original furnace body shell (1) and the inner wall of the outer shell (2) is 20-150 mm.
3. The anti-cracking shell for the top combustion type hot blast stove according to claim 1, characterized in that the thickness of the refractory cellucotton heat preservation cotton (3) is 20-150mm, so as to reduce the heat dissipation loss of the outer shell (2), save fuel and achieve energy saving and high efficiency.
4. The crack-proof shell for the top-fired hot-blast stove according to claim 1, wherein the outer shell (2) is a Q345R steel plate, and the thickness is 20-60mm according to the diameter of different parts and different air supply pressure.
5. The cracking-proof shell for the top-combustion type hot-blast stove according to claim 1, characterized in that when the cracking-proof shell for the top-combustion type hot-blast stove is filled between the outer shell (2) and the original furnace body shell (1) for heat preservation, the thickness of the steel plate of the outer shell (2) is 1-3 mm.
6. The anti-cracking shell for the top combustion type hot blast stove according to claim 1, characterized in that the connecting blocks (6) are spot-welded on two sides of the welding seam of the inner surface (2-1) of the outer shell (2), and the two end surfaces of the welding seam of the steel plate are fixedly connected together by spot welding, so that the surfacing welding is facilitated.
7. The crack-proof housing for the top-fired hot-blast stove according to claim 6, wherein the connecting block is a strip of steel plate made of steel plate with a thickness of 6mm and a width of 10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220558166.5U CN217077663U (en) | 2022-03-15 | 2022-03-15 | Cracking-proof shell for top-combustion type hot-blast stove |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220558166.5U CN217077663U (en) | 2022-03-15 | 2022-03-15 | Cracking-proof shell for top-combustion type hot-blast stove |
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| CN217077663U true CN217077663U (en) | 2022-07-29 |
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| CN202220558166.5U Active CN217077663U (en) | 2022-03-15 | 2022-03-15 | Cracking-proof shell for top-combustion type hot-blast stove |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116814882A (en) * | 2023-08-16 | 2023-09-29 | 北京卡卢金热风炉技术有限公司 | Hot-blast stove shell welding repair structure and hot-blast stove shell welding repair method |
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2022
- 2022-03-15 CN CN202220558166.5U patent/CN217077663U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116814882A (en) * | 2023-08-16 | 2023-09-29 | 北京卡卢金热风炉技术有限公司 | Hot-blast stove shell welding repair structure and hot-blast stove shell welding repair method |
| CN116814882B (en) * | 2023-08-16 | 2024-01-23 | 北京卡卢金热风炉技术有限公司 | Hot-blast stove shell welding repair structure and hot-blast stove shell welding repair method |
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