CN214032568U - Reducing agent high-speed wear-resisting impact-resisting device for smelting reduction process - Google Patents
Reducing agent high-speed wear-resisting impact-resisting device for smelting reduction process Download PDFInfo
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- CN214032568U CN214032568U CN202021844170.5U CN202021844170U CN214032568U CN 214032568 U CN214032568 U CN 214032568U CN 202021844170 U CN202021844170 U CN 202021844170U CN 214032568 U CN214032568 U CN 214032568U
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Abstract
A high-speed wear-resistant impact-resistant device for a reducing agent for a smelting reduction process relates to the technical field of reducing agent conveying pipelines and comprises a wear-resistant pipe and a cast iron pipe, wherein the wear-resistant pipe and the cast iron pipe are coaxially connected through a centering head, the wear-resistant pipe comprises an alloy steel pipe and a ceramic short pipe which are sequentially sleeved from outside to inside, and a high-temperature-resistant connecting layer is further arranged between the alloy steel pipe and the ceramic short pipe. The utility model solves the problems that the cast iron conveying pipeline in the traditional technology has poor wear resistance, more surface gaps, can not form attachment with the inner wall of the steel pipe, is easy to fall off and the surface of the lining pipe is seriously corroded; the working condition that can't adapt to sharp change breaks easily, short service life's problem.
Description
Technical Field
The utility model relates to a buggy pipeline technical field, concretely relates to high-speed wear-resisting protecting against shock device of reductant for melting reduction technology.
Background
The HIsmelt smelting reduction smelting process is the only new technology for realizing industrialized smelting reduction ironmaking in the world at present, has strong raw material applicability, directly uses coal powder and iron ore for smelting to produce high-quality clean molten iron, saves serious pollution processes such as coal coking, iron ore sintering and the like compared with the blast furnace ironmaking technology, has the environmental protection advantage of ultralow emission and the benefit advantage of low cost investment, provides a new idea for transformation and upgrading of the steel industry, and has large-scale popularization conditions.
At present, the fuel of the HIsmelt factory is pulverized coal particles, the process requires that the conveying mode is pneumatic conveying, and the conveying speed is 20-30 m/s. The Hismelt process requires that pulverized coal particles are directly conveyed into a reaction vessel through a pulverized coal spray gun, and the pulverized coal spray gun is inserted into high-temperature slag at 1400-1600 ℃, so that high requirements are provided for the service life and the performance of the pulverized coal spray gun. The pulverized coal spray gun is divided into a water-cooling jacket and a wear-resistant lining pipe, the water-cooling jacket is used for cooling and protecting the spray gun and preventing high-temperature slag from melting the spray gun, and the wear-resistant lining pipe is used for conveying materials. According to the condition of current pipeline, the life of wear-resisting interior bushing pipe is short, directly influences production operating efficiency, and wear-resisting interior bushing pipe damages and can directly lead to whole mill to stop production, and the cost of overhaul is huge, can cause the incident when serious.
The existing pulverized coal pipeline in the pipeline industry is a conventional wear-resistant cast iron pipeline and a ceramic structure pipeline formed by splicing a plurality of wear-resistant ceramic tiles, and does not meet the process requirement. The continuous high-speed material conveying of pulverized coal causes the pipeline to be fatigued to cause the pipeline to be gradually worn out due to impact, cutting abrasion, severe high-temperature working conditions and the like generated on the pipe wall, the work of stopping production, replacing and maintaining is needed to be frequently carried out, the production operation rate of a factory is directly influenced, the pipeline is easily worn out and water is leaked to cause accidents such as explosion, and higher requirements are provided for the wear resistance, the strength and the service life of the pipeline.
The prior art discloses a patent of CN105114972B, which comprises a main powder conveying pipeline, an equipartition device, a branch pipeline distributor and a plurality of branch powder conveying pipelines, wherein the tail end of the main powder conveying pipeline is connected with the starting end of the equipartition device through a sealing flange, the tail end of the equipartition device is connected with the starting end of the branch pipeline distributor in a sealing manner, and the tail end of the branch pipeline distributor is connected with the plurality of branch powder conveying pipelines; the outer sleeve and the air inlet of the main powder conveying pipeline are utilized to blow air into the outer sleeve, meanwhile, because the periphery of the inner sieve tube is uniformly distributed with air holes, the diameter of the air holes is smaller than the diameter of the coal powder particles, the air can also enter the inner sieve tube to blow the coal powder of the inner sieve tube, and the air powder is blown again to achieve the purpose of uniformity; and finally, dividing the inner equalizing pipes into a plurality of groups through the bifurcated pipes of the branch pipe distributor, wherein each group of inner equalizing pipes corresponds to one special-shaped transition pipe through the bifurcated pipe, and the air and the powder continuously flow forwards along with the acting force of blast air and enter a branch powder conveying pipeline through a connecting pipe to complete branching.
The device gradually exposes the defects of the technology along with the use, and the following problems often occur;
firstly, the conventional wear-resistant cast iron conveying pipeline has relatively poor wear resistance, and the service life of the conventional wear-resistant cast iron conveying pipeline applied to the lining pipe of the HIsmelt pulverized coal spray gun is about 1 year.
Secondly, the conventional pipeline with the ceramic structure has low thermal stability, namely poor heat brittleness resistance, cannot adapt to the working condition of rapid change of the heat and the cold of the HIsmelt process, is easy to break, has short service life and is easy to cause sudden accidents.
Thirdly, the conventional ceramic structure pipeline is formed by splicing a plurality of wear-resistant ceramic tiles, has a large surface gap, cannot form good attachment with the inner wall of the steel pipe, and is easy to fall off.
Fourthly, the high-temperature coal gas with complex components in the HIsmelt technical reaction furnace seriously corrodes the outer surface of the lining pipe.
In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides a reducing agent high-speed wear-resistant and impact-resistant device for smelting reduction process, which is used for solving the problems that cast iron conveying pipelines in the traditional technology have poor wear resistance and more surface gaps, can not form good attachment with the inner wall of a steel pipe, are easy to fall off and the outer surface of an inner lining pipe is seriously corroded; the working condition that can't adapt to sharp change breaks easily, short service life's problem.
In order to achieve the above object, the utility model provides a following technical scheme:
the reducing agent high-speed wear-resistant impact-resistant device for the smelting reduction process comprises a wear-resistant pipe and a cast iron pipe, wherein the wear-resistant pipe is coaxially connected with the cast iron pipe through a centering head, the wear-resistant pipe comprises an alloy steel pipe and a ceramic short pipe which are sequentially sleeved from outside to inside, and a high-temperature-resistant connecting layer is further arranged between the alloy steel pipe and the ceramic short pipe.
As an optimized scheme, a plurality of the ceramic short pipes are butted along the axial direction.
As an optimized scheme, one end of the ceramic short pipe is provided with a connecting convex part, and the other end of the ceramic short pipe is provided with a matched connecting groove.
As an optimized scheme, the inlet end of the wear-resistant pipe is further fixedly connected with a connecting disc.
As an optimized scheme, the cast iron pipe is a chromium alloy cast pipe.
As an optimized scheme, the wear-resistant pipe and the connecting disc, the wear-resistant pipe and the centering head and the cast iron pipe and the centering head are fixedly welded, and the width of a welding line is 0.1-8 mm.
As an optimized scheme, a plurality of rings of fixing blocks are arranged on the outer wall of the alloy steel pipe in parallel in the extending direction, the number of the fixing blocks on each ring is 3-10, and the distance between every two adjacent rings is 300-1000 mm.
As an optimized scheme, the inner diameter of the wear-resistant pipe is 60-100mm, the outer diameter is 120-200mm, and the length is 3-20 m.
As an optimized scheme, the wall thickness of the ceramic short pipe is 10-20mm, the wall thickness of the high-temperature-resistant connecting layer is 5-15mm, and the wall thickness of the alloy steel pipe is 10-15 mm.
As an optimized scheme, the wall thickness of the cast iron pipe is 10-30mm, and the length of the cast iron pipe is 200-400 mm.
Compared with the prior art, the beneficial effects of the utility model are that:
the ceramic wear-resistant pipe and the wear-resistant cast iron pipe are combined, so that the service life of the lining pipe can be greatly prolonged to 3-5 years in the range that the conveying speed of the reducing agent reaches more than 0.1 Mach and less than 0.5 Mach on the premise of ensuring the thermal stability of the lining pipe of the pulverized coal spray gun;
the structure of the ceramic wear-resistant pipe is optimized, the traditional multiple wear-resistant ceramic bricks are changed into a multi-section ceramic structure, and the problems that the ceramic is not tightly attached and is easy to fall off are solved;
the reasonable structural design of the lining pipe is provided with a centering head and a fixed block, and the centering head and the fixed block are used for guiding and centering when the lining pipe is installed, so that the central line of the lining pipe is superposed with the central line of the coal gun outer sleeve;
the centralizing head can also play a role in blocking high-temperature slag, blocking high-temperature coal gas and heat impact from a projection container and playing a role in protecting the lining pipe;
through reasonable structural design, the inner cavity of the reducing agent injection gun is uniformly impacted, the stability of the spring effect, the offset range and the injection depth in the SRV furnace are ensured to be within the process requirements, and the melting reduction reaction efficiency and the stability of core equipment are improved;
the stability in the working process is improved; the parts are few, the working procedure is simple and convenient, and the failure rate is low; the structure is simple, and the service life is long; simple and convenient operation and control, easy large-scale manufacture and installation and wide application range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is an enlarged view of portion B of FIG. 1;
in the figure: 1. a connecting disc; 2. alloy steel pipes; 3, a high-temperature resistant connecting layer; 4. a ceramic short tube; 5. a fixed block; 6, righting the head; 7. a cast iron pipe; 8. welding seams; 9-connecting the convex part.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 to 3, the high-speed wear-resistant and impact-resistant reducing agent device for the smelting reduction process comprises a wear-resistant pipe and a cast iron pipe 7, wherein the wear-resistant pipe and the cast iron pipe 7 are coaxially connected through a centering head 6, the wear-resistant pipe comprises an alloy steel pipe 2 and a ceramic short pipe 4 which are sequentially sleeved from outside to inside, and a high-temperature-resistant connecting layer 3 is further arranged between the alloy steel pipe 2 and the ceramic short pipe 4.
The alloy steel pipe 2 is made of straight pipe alloy steel through integral casting and processing by a heat treatment process.
The ceramic short pipe 4 is of a wear-resistant and breakage-proof ceramic structure.
The high-temperature-resistant connecting layer 3 is made of high-temperature-resistant filler and is used for fixedly connecting the ceramic structure, the buffer effect is guaranteed to be achieved in the process of changing between 0 and 300 ℃ of heat and cold, thermal stress is eliminated, and the inner-region ceramic structure is prevented from being cracked due to stress concentration.
The ceramic short pipes 4 are in butt joint along the axial direction, the gaps among the structures of the ceramic short pipes 4 are not more than 0.5mm, and the vertical depth deviation is not more than 0.1 mm.
Each section of the ceramic short pipe 4 is 400-1000mm long.
The one end of pottery nozzle stub 4 is equipped with connection boss 9, and the other end is equipped with assorted connecting grooves, can guarantee the joint strength that ceramic linked, makes inner zone ceramic structure combine closely simultaneously, has guaranteed the whole precision of reductant transport inside lining again.
The inlet end of the wear-resistant pipe is also fixedly connected with a connecting disc 1 which is mainly used for connecting an inner lining pipe of the pulverized coal spray gun with a water-cooling jacket and the like.
The connecting disc 1 is provided with 8-16 bolts with the diameter of 36, which are used for connecting with the coal gun outer sleeve and ensuring the concentricity between the lining structure and the gun body.
The cast iron pipe 7 is a chromium alloy casting pipe, is made of chromium alloy casting material, has high temperature resistance and wear resistance, is positioned at the outlet of the lining pipe of the spray gun, and is directly contacted with the external environment of a 1300-plus-1600 ℃ iron bath high-temperature molten pool.
The wear-resistant pipe and the connecting disc 1, the wear-resistant pipe and the centering head 6 and the cast iron pipe 7 and the centering head 6 are fixed in a welding way, and the width of a welding line 8 is 0.1-8 mm.
The outer wall of the alloy steel pipe 2 is provided with a plurality of rings of fixing blocks 5 in parallel in the extending direction, the number of the fixing blocks 5 on each ring is 3-10, and the distance between adjacent rings is 300-1000 mm.
The fixing block 5 and the centering head 6 play a role in guiding and centering in the installation process of the spray gun lining pipe and the water-cooling jacket together, so that the centre lines of the spray gun lining pipe and the water-cooling jacket are superposed.
In the using process, the centralizing head 6 is filled in a gap port between the inner lining pipe and the water-cooling jacket, so that the linearity deviation of the whole lining structure is kept within 5% in the range of the outlet and the inlet, and high-temperature slag is prevented from flowing backwards into a gap between the reducing agent spray gun body and the lining structure through the external contact type water-cooling structure, so that the reducing agent spray gun body is damaged and even safety accidents are caused.
The inner diameter of the wear-resistant pipe is 60-100mm, the outer diameter is 120-200mm, and the length is 3-20 m.
The wall thickness of the ceramic short pipe 4 is 10-20mm, the wall thickness of the high-temperature resistant connecting layer 3 is 5-15mm, and the wall thickness of the alloy steel pipe 2 is 10-15 mm.
The cast iron pipe 7 has a wall thickness of 10-30mm and a length of 200-400 mm.
The inner diameter of the centralizing head 6 is 60-150mm which is the inner diameter of the wear-resistant pipe, the outer diameter is 166-286mm, and the installation clearance with the water-cooling jacket of the pulverized coal injection lance is less than 2 mm.
In a conventional ceramic pipeline, a wear-resistant ceramic layer is adhered to the inner wall of a steel pipe through a high-molecular adhesive, and the wear-resistant ceramic layer is formed by splicing a plurality of wear-resistant ceramic tiles. The ceramic blocks have gaps in the boring flow direction, gaps exist in the annular direction, and due to splicing, the adjacent ceramic blocks are uneven, and the inner surface of the pipeline is not smooth. The ceramic block can not form fine adhesion with the steel pipe inner wall, drops easily, receives the influence of environment moreover, and damaged phenomenon often appears in long-time use, and the high temperature takes place the conflagration easily moreover, reduces the life of pipeline, and the security is not high.
According to the scheme, the ceramic short pipe 4 is used for replacing a ceramic block, and through combination and design between the connecting mechanism and relevant accessories, the splicing gap of the ceramic structure in the inner lining of the smelting reduction reducing agent spray gun is reduced, the inner wall of the pipeline is smooth, the friction resistance is small, material conveying is facilitated, the abrasion of the pipeline is reduced, and the service life is prolonged.
The utility model discloses, combine with ceramic nozzle stub 4 and right head 6, high temperature resistant wear-resisting cast iron pipe 7 to the water-cooling overcoat of cooperation coal rifle, the effectual melting reduction technology high temperature slag ambient temperature of having solved is high, outside and port erode acutely, the high wearing and tearing of inside transported substance velocity of flow and the problem that the impact force is strong, avoids ceramic structure and high temperature direct contact simultaneously, has prolonged the life of interior bushing pipe.
Other parts involved in the scheme are common in daily life and do not belong to the innovation of the scheme, so that the details are not repeated.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.
Claims (10)
1. A high-speed wear-resisting protecting against shock device of reductant for smelting reduction technology which characterized in that: the wear-resistant pipe comprises a wear-resistant pipe and a cast iron pipe (7), wherein the wear-resistant pipe and the cast iron pipe (7) are coaxially connected through a centering head (6), the wear-resistant pipe comprises an alloy steel pipe (2) and a ceramic short pipe (4) which are sequentially sleeved from outside to inside, and a high-temperature-resistant connecting layer (3) is further arranged between the alloy steel pipe (2) and the ceramic short pipe (4).
2. The high-speed wear-resistant impact-resistant device for the reducing agent for the smelting reduction process according to claim 1, characterized in that: the ceramic short pipes (4) are in butt joint with each other along the axial direction.
3. The high-speed wear-resistant impact-resistant device for the reducing agent for the smelting reduction process according to claim 2, characterized in that: one end of the ceramic short pipe (4) is provided with a connecting boss (9), and the other end is provided with a matched connecting groove.
4. The high-speed wear-resistant impact-resistant device for the reducing agent for the smelting reduction process according to claim 1, characterized in that: the inlet end of the wear-resistant pipe is also fixedly connected with a connecting disc (1).
5. The high-speed wear-resistant impact-resistant device for the reducing agent for the smelting reduction process according to claim 1, characterized in that: the cast iron pipe (7) is a chromium alloy cast pipe.
6. The high-speed wear-resistant impact-resistant device for the reducing agent for the smelting reduction process according to claim 4, characterized in that: the space between the wear-resistant pipe and the connecting disc (1), the space between the wear-resistant pipe and the centralizing head (6) and the space between the cast iron pipe (7) and the centralizing head (6) are all welded and fixed, and the width of a welding line (8) is 0.1-8 mm.
7. The high-speed wear-resistant impact-resistant device for the reducing agent for the smelting reduction process according to claim 1, characterized in that: the outer wall of the alloy steel pipe (2) is provided with a plurality of rings of fixing blocks (5) in parallel in the extending direction, the number of the fixing blocks (5) on each ring is 3-10, and the distance between adjacent rings is 300-1000 mm.
8. The high-speed wear-resistant impact-resistant device for the reducing agent for the smelting reduction process according to claim 1, characterized in that: the inner diameter of the wear-resistant pipe is 60-100mm, the outer diameter is 120-200mm, and the length is 3-20 m.
9. The high-speed wear-resistant impact-resistant device for the reducing agent for the smelting reduction process according to claim 1, characterized in that: the wall thickness of the ceramic short pipe (4) is 10-20mm, the wall thickness of the high-temperature-resistant connecting layer (3) is 5-15mm, and the wall thickness of the alloy steel pipe (2) is 10-15 mm.
10. The high-speed wear-resistant impact-resistant device for the reducing agent for the smelting reduction process according to claim 1, characterized in that: the wall thickness of the cast iron pipe (7) is 10-30mm, and the length is 200-400 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021844170.5U CN214032568U (en) | 2020-08-29 | 2020-08-29 | Reducing agent high-speed wear-resisting impact-resisting device for smelting reduction process |
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| CN202021844170.5U CN214032568U (en) | 2020-08-29 | 2020-08-29 | Reducing agent high-speed wear-resisting impact-resisting device for smelting reduction process |
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| CN202021844170.5U Active CN214032568U (en) | 2020-08-29 | 2020-08-29 | Reducing agent high-speed wear-resisting impact-resisting device for smelting reduction process |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Hebei Xinggang Technology Co.,Ltd. Assignor: SHANDONG MOLONG PETROLEUM MACHINERY Co.,Ltd. Contract record no.: X2023980034949 Denomination of utility model: A high-speed wear-resistant and impact resistant device for reducing agents used in melting reduction process Granted publication date: 20210824 License type: Common License Record date: 20230423 |
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| EE01 | Entry into force of recordation of patent licensing contract |