CN210125730U - Heat-preservation steel ladle masonry structure - Google Patents

Abstract

This utility model discloses an insulated steel ladle masonry structure, characterized by comprising a steel layer, a refractory material lining disposed inside the steel layer, and several layers of nano-insulation layers within or between the refractory material lining and the steel layer. This steel ladle exhibits better thermal insulation performance, thermal shock resistance, and higher refractoriness, improving energy efficiency and reducing heat capacity, especially in tundishes. It reduces the amount of refractory material used without affecting service life, lowers heat capacity, and effectively reduces tapping temperature while maintaining molten steel temperature, thus extending ladle lining life and achieving good economic benefits.

Description

Insulation Ladle Masonry Structure

technical field

The utility model relates to the technical field of cleaning treatment of silicon steel before annealing, in particular to a thermal insulation ladle masonry structure.

Background technique

The ladle is an important device in the metallurgical industry. The function of the ladle is to undertake the molten steel of the upstream steelmaking furnace such as the converter, and transport the molten steel to the out-of-furnace refining equipment or continuous casting site for pouring operations. At the same time, the ladle is also the key equipment for out-of-furnace refining. The ladle is composed of a refractory lining and a steel layer, and the refractory lining is usually composed of a working layer, a permanent layer, and a thermal insulation layer. The refractory material of the working layer is in direct contact with molten steel and slag, and can withstand mechanical erosion and high-temperature chemical erosion of molten steel and slag.

With the development of out-of-furnace refining technology and the large-scale continuous casting ladle, many molten steel refining treatments are carried out in the ladle. The molten steel in the steelmaking furnace enters the ladle, and the scouring, erosion and whirling force of the molten steel on the lining materials are not affected. All, in order to reduce the impact force of molten steel on the refractory material of the working layer of the ladle and the refractory material of the bottom of the ladle, the molten steel in the steelmaking furnace adopts secondary feeding, and the refractory materials in the middle and upper layers of the working layer of the ladle wall and the middle area of the bottom of the ladle are used for the molten steel in the steelmaking furnace. The impact is large, and it is easy to fall or form pits, so that the material life of each part of the ladle lining cannot be synchronized, which increases the number of local maintenance of the ladle, affects the service life of the ladle, reduces the turnover efficiency of the ladle, and increases the labor intensity of workers. Refractory lining is a waste of resources. Temperature control is a key process parameter in the production process of steelmaking and continuous casting. The control of molten steel temperature runs through the entire production process. Appropriate molten steel temperature is the guarantee of process control and slab quality.

As the main transport carrier of molten steel, the ladle's thermal insulation performance directly affects the temperature control in the entire steelmaking process. Improving the thermal insulation performance of the ladle can play the following roles: (1) It is beneficial to the control of the temperature drop in the process, stabilize the temperature of the molten steel in the tundish, and achieve steady-state pouring. If the molten steel temperature is lower than the lower limit, it will cause the inclusions to float insufficiently, and the tundish nozzle will nodulate, which will affect the quality of the continuous casting billet. The terminal temperature of the converter is proportional to the oxygen content in the steel. The higher the terminal temperature of the converter, the more oxygen content in the steel. The increase in the amount of deoxidizer will reduce the yield of the alloy, increase the deoxidation product, and increase the inclusions in the steel, which will affect the molten steel. quality; on the other hand, excessive tapping temperature will not only seriously erode the magnesia-carbon bricks of the converter working layer, reduce the age of the converter and the ladle, increase the consumption of refractory materials, cause the refractory materials to fall off, flow into molten steel, affect the quality of molten steel, and even occur (3) It is beneficial to reduce heat loss, save energy and reduce production costs.

The cleanliness of molten steel in the production of cold-rolled substrates is high, the process and time outside the furnace are long, and the temperature drop of molten steel during transportation is large, so the converter has to adopt high-temperature tapping mode, but the temperature of molten steel in the tundish is often lower than the lower limit, which is not conducive to The control of molten steel cleanliness and continuous casting billet quality affects the improvement of quality problems such as slag inclusion and warping of cold-rolled substrates. The utility model is therefore derived.

Utility model content

In view of the defects of the above-mentioned technologies, the technical problem to be solved by this utility model is to provide a thermal insulation ladle masonry structure, which can solve the problem of high temperature tapping due to poor thermal insulation effect of the ladle in the prior art, but the temperature of the molten steel in the tundish is lower than the lower limit. , which is not conducive to the control of molten steel cleanliness and continuous casting billet quality, resulting in problems such as slag inclusion and warping of cold-rolled substrates.

The utility model provides a thermal insulation ladle masonry structure, which is characterized in that it comprises a steel layer and a refractory lining arranged on the inner side of the steel layer, wherein the refractory lining or several layers between the refractory lining and the steel layer Nano insulation layer. At present, the thermal insulation effect of the commonly used insulation layer is not good, the temperature drop rate of molten steel increases, the temperature of the outer wall of the continuous casting tundish is too high, and the thermal deformation of the cladding is serious. In order to avoid the occurrence of cold steel accidents, sometimes the tapping temperature has to be increased, which affects the performance of equipment efficiency and the improvement of economic benefits. In the thermal insulation ladle masonry structure of the utility model, a nano thermal insulation layer is arranged in the inner lining of the refractory material or between the inner lining of the refractory material and the steel layer; The thickness of the thermal insulation layer and permanent layer of the continuous casting tundish improves the thermal insulation effect of the tundish and the amount of steel loaded.

A preferred technical solution is that: the refractory material lining is sequentially provided with a working layer, a permanent layer and a thermal insulation layer from the inside to the outside, and the thermal insulation layer is a nano thermal insulation layer. The utility model adopts the nano-insulation layer to effectively reduce the tapping temperature of the ladle, prolong the life of the ladle lining, reduce the operating temperature of the entire steel-making process, and reduce the refractory consumption per ton of steel. The consumption of refractory materials exceeds the world level.

The preferred technical solution is: the nano-insulation layer is made of nano-sized hollow alumina microspheres, magnesium-aluminum hollow spheres or aluminum-calcium hollow spheres or corundum hollow spheres or light-weight high-aluminum particles or light-weight mullite particles. Insulation. The ladle masonry structure of the utility model has better thermal insulation performance, better thermal vibration resistance and higher refractoriness, integrates structural strength support and thermal insulation, can improve the energy saving effect of the ladle and reduce the heat capacity, without affecting the service life. Under the condition of reducing the amount of refractory materials, reducing the heat capacity, and ensuring the temperature of molten steel, it can effectively reduce the tapping temperature, prolong the life of the lining, and obtain good economic benefits.

The preferred technical solution is that: the steel layer includes a steel shell bottom plate and a cylindrical steel shell side plate, the upper end of the steel shell side plate is provided with a molten steel nozzle, and the bottom plate of the steel shell is sequentially provided with bottom-clad permanent The steel shell side plate is provided with a nano-insulation layer, a cladding permanent layer and a cladding working layer in sequence, and the bottom of the cladding permanent layer is sealed and abutted on the bottom permanent layer.

The preferred technical solution is: the center of the bottom working layer (8) is the impact area, and the thickness of the bottom working layer accounting for the total area is 100 mm higher than the surrounding area. By increasing the thickness of the bricks in the impact zone of the utility model, the strength is improved, the service life of the bottom working layer is improved, and the cost per ton of steel is reduced.

A preferred technical solution is that the thickness of the bottom plate of the steel shell is greater than the thickness of the side plate of the steel shell, and the bottom plate of the steel shell and the side plate of the steel shell are connected by welding. The steel shell is welded by the steel shell bottom plate and the steel shell side plate. Compared with integral molding, the process difficulty is reduced and the casting cost is reduced. The thickness of the steel shell bottom plate is larger than that of the steel shell side plate, which improves the life of the ladle bottom. , which enhances security.

The preferred technical solution is: the bottom permanent layer and the wall permanent layer are built with high alumina bricks.

A preferred technical solution is that: both the cladding working layer and the cladding bottom working layer are made of magnesia-carbon bricks.

In order to reduce the temperature drop in the process of steelmaking, the technical scheme of the utility model introduces nanometer heat insulation boards into the ladle masonry structure, and when building the ladle, the original heat insulation boards are changed to new nanometer materials, for example, the nanometer steel ladle adopts a three-layer insulation board. Compared with the prior art, the thermal insulation ladle masonry structure provided by the utility model has the following beneficial effects:

The thermal insulation ladle masonry structure of the utility model replaces the conventional thermal insulation layer with a nano thermal insulation layer with better thermal insulation performance, better thermal vibration resistance and higher refractoriness, the refractory lining of the ladle can be thinned, and the nano thermal insulation layer has the advantages of light weight. , the thermal insulation effect is better, and the combination of structural strength support and thermal insulation can improve the energy saving effect of the ladle, especially the tundish, and reduce the heat capacity, reduce the amount of refractory materials and reduce the heat capacity without affecting the service life. , and can effectively reduce the tapping temperature, prolong the life of the lining, and obtain good economic benefits under the condition of ensuring the temperature of the molten steel.

The steel ladle steel shell of the utility model is formed by welding the steel shell bottom plate and the steel shell side plate, and compared with integral molding, the process difficulty is reduced, the casting cost is reduced, the stability of the structure is ensured and the service life is prolonged. .

Description of drawings

FIG. 1 is a schematic structural diagram of a thermal insulation ladle masonry structure according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of the direction A of FIG. 1 .

Detailed ways

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances such that the embodiments of the application described herein can, for example, be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

For ease of description, spatially relative terms, such as "on", "over", "on the surface", "above", etc., may be used herein to describe what is shown in the figures. The spatial positional relationship of one component or module or feature shown to other components or modules or features. It should be understood that spatially relative terms are intended to encompass different orientations of a component or module in use or operation in addition to the orientation depicted in the figures. For example, if a component or module in the figures is turned over, components or modules described as "above" or "above" other components or modules or constructions would then be oriented "above the other" components or modules or constructions" or "under" other components or modules or constructions. Thus, the exemplary term "above" can encompass both an orientation of "above" and "below." The component or module may also be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

The utility model provides a thermal insulation ladle masonry structure, which is characterized in that it comprises a steel layer and a refractory lining arranged on the inner side of the steel layer, wherein the refractory lining or several layers between the refractory lining and the steel layer Nano insulation layer.

The working principle of the present utility model is:

The utility model adopts nanometer materials, such as nanometer-sized hollow alumina microspheres, magnesium-aluminum hollow spheres or aluminum-calcium hollow spheres or corundum hollow spheres or light-weight high-aluminum particles or light-weight mullite particles as the thermal insulation layer, which can It can effectively suppress and shield the radiant heat of infrared rays and the conduction heat of heat, and the heat insulation suppression efficiency can reach about 90%.

Example

As shown in Figures 1 and 2, the thermal insulation ladle masonry structure includes a steel layer 1, a refractory lining arranged on the inner side of the steel layer, and three nanometer thermal insulation layers 3 between the refractory lining 2 and the steel layer. . The refractory lining is provided with a working layer 21 , a permanent layer 22 and an insulating layer 3 in sequence from the inside to the outside, and the insulating layer is a nano-insulation layer. The nano-insulation layer is an insulation layer 3 using nano-sized hollow alumina microspheres, magnesium-aluminum hollow spheres or aluminum-calcium hollow spheres or corundum hollow spheres or light-weight high-alumina particles or light-weight mullite particles.

The steel layer includes a steel shell bottom plate 10 and a cylindrical steel shell side plate 11, the upper end of the steel shell side plate is provided with a molten steel nozzle, and the steel shell bottom plate is sequentially provided with a bottom cover permanent layer, a bottom cover Working layer, the steel shell side plates are sequentially provided with a nano-insulation layer 3, a cladding wall permanent layer 22 and a cladding wall working layer 21, and the bottom of the cladding permanent layer is sealed and abutted on the bottom of the cladding permanent layer. The center of the cover bottom working layer (8) is the impact area, and the thickness of the total area of the cover bottom working layer is 100 mm higher than the surrounding area.

The thickness of the bottom plate of the steel shell is greater than the thickness of the side plate of the steel shell, and the bottom plate of the steel shell and the side plate of the steel shell are connected by welding. The cladding bottom permanent layer and the cladding wall permanent layer are made of high-alumina bricks. Both the cladding working layer and the cladding bottom working layer are made of magnesia-carbon bricks. The steel shell is welded by the steel shell bottom plate and the steel shell side plate. Compared with integral molding, the process difficulty is reduced and the casting cost is reduced. The thickness of the steel shell bottom plate is larger than that of the steel shell side plate, which improves the life of the ladle bottom. , which enhances security.

The center of the bottom working layer of the cladding is the impact area 12, and the thickness of the total area of the working layer of the cladding is 100mm higher than that of the surrounding area, and the scope of the impact area is expanded to a quarter, so as to avoid the bottom bricks near the impact area being affected during the tapping process. The molten steel is impacted and fractured, and the impact area increases the strength of the brick by increasing the thickness of the brick, which improves the service life of the bottom working layer and reduces the cost per ton of steel.

The utility model uses a nanometer thermal insulation layer on the ladle, adopts three layers of nanometer thermal insulation board materials, the permanent layer is built with high-alumina bricks, and the working layer is built with magnesia carbon bricks; the ordinary ladle thermal insulation layer adopts asbestos thermal insulation board material, The permanent layer, working layer and nano test ladle are identical. Infrared thermal imager is used to measure the temperature of the ladle shell. The temperature of the ladle shell of the nano ladle is significantly higher than that of the molten pool area along the lower part of the ladle mouth and the area where the heat insulation board is not attached, while the overall temperature of the ordinary ladle is higher, and there is no temperature difference. This shows that the nano thermal insulation board plays an obvious role in thermal insulation in the ladle, while the thermal insulation effect of the asbestos board is relatively poor.

The ladle of this embodiment uses nanomaterials, and the temperature of the ladle shell is 61°C lower than that of the ordinary ladle on average; from the statistics of the temperature-measured steel heat process data, compared with the ordinary ladle, the nano ladle is refined and tapped to the tundish. The temperature drop value of molten steel is reduced by 3-5℃, the temperature drop rate of molten steel from refining and tapping to tundish is reduced by 0.03-0.07℃/min, the temperature drop value of molten steel in the tundish is reduced by 0.5-1℃, and the average ton steel of nano ladle is higher than that of ordinary ladle. Benefit 0.80 yuan.

The above examples are only to illustrate the technical concept and characteristics of the present invention, and its purpose is to allow those who are familiar with the technology to understand the content of the present invention and implement accordingly, and cannot limit the scope of protection of the present invention with this. All equivalent transformations or modifications made according to the spirit of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. A heat-preservation ladle masonry structure is characterized by comprising a steel layer and a refractory material lining arranged on the inner side of the steel layer, wherein a plurality of nano heat-preservation layers are arranged between the refractory material lining and the steel layer,

the nano heat-insulating layer is a heat-insulating layer made of hollow alumina microspheres, magnesium-aluminum hollow spheres or aluminum-calcium hollow spheres or corundum hollow spheres or light high-aluminum particles or light mullite particles with nano particle sizes.

2. The insulating ladle masonry structure according to claim 1, wherein the refractory lining is provided with a working layer and a permanent layer in this order from the inside to the outside.

3. The heat-insulating ladle masonry structure according to claim 1, wherein the steel layer comprises a steel shell bottom plate and a cylindrical steel shell side plate, a steel nozzle is arranged at the upper end of the steel shell side plate, a ladle bottom permanent layer and a ladle bottom working layer are sequentially arranged on the steel shell bottom plate, a nano heat-insulating layer, a ladle wall permanent layer and a ladle wall working layer are sequentially arranged on the steel shell side plate, and the bottom of the ladle wall permanent layer is in sealing abutment with the ladle bottom permanent layer.

4. The insulating ladle masonry structure according to claim 3, characterized in that the center of the ladle bottom working layer (8) is an impact zone, and the thickness of the total area of the ladle bottom working layer is higher than the surrounding 100 mm.

5. The heat-insulating ladle masonry structure according to claim 3, wherein the thickness of the steel shell bottom plate is greater than that of the steel shell side plate, and the steel shell bottom plate and the steel shell side plate are connected by welding.

6. The masonry structure for heat-preservation ladles according to claim 3, wherein the permanent bottom layer and the permanent wall layer are constructed by high-alumina bricks.

7. The masonry structure for heat-preservation ladles according to claim 3, wherein the ladle wall working layer and the ladle bottom working layer are both constructed by magnesia carbon bricks.

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