CN112595119A - Furnace building method for medium-frequency induction furnace - Google Patents
Furnace building method for medium-frequency induction furnace Download PDFInfo
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- CN112595119A CN112595119A CN202011466261.4A CN202011466261A CN112595119A CN 112595119 A CN112595119 A CN 112595119A CN 202011466261 A CN202011466261 A CN 202011466261A CN 112595119 A CN112595119 A CN 112595119A
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- furnace
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- lining
- frequency induction
- building method
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/0003—Linings or walls
- F27D1/0033—Linings or walls comprising heat shields, e.g. heat shieldsd
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B2014/0843—Lining or casing
Abstract
The invention provides a furnace building method of a medium frequency induction furnace, which comprises the steps of preparation of furnace lining materials, preparation of a furnace lining fetal membrane, knotting of a furnace bottom, knotting of a furnace wall, furnace baking and sintering, and compared with the prior art, the method is characterized in that: the acid furnace lining material is easy to obtain and the furnace lining has pure components; the furnace building process is easy to operate, no special tool is needed, and the compactness of the furnace lining is high after the furnace building process is finished; the oven drying time is short; the furnace lining has no perforation hidden trouble and is not easy to crack in the using process, and the later use is easy to maintain; the service life is long.
Description
Technical Field
The invention belongs to the technical field of medium-frequency induction furnaces, and particularly relates to a furnace building method of a medium-frequency induction furnace.
Background
The medium frequency induction furnace is a common casting and smelting device, has the characteristics of high melting efficiency, good electricity-saving effect, low ambient temperature of the furnace, less smoke dust, good operating environment, uniform metal components, quick melting and temperature rise, easy control of furnace temperature, high production efficiency and the like, and is widely applied to the processes of cast iron, cast steel and the like.
In the prior art, a wet method furnace building method is generally adopted for a medium-frequency induction furnace, and the method causes uneven compactness of lining sand during furnace casting due to poor liquidity of the lining sand after boric acid is added into the lining sand, and easily causes hearth disjointing during mold removal, so that a hearth manufactured by the wet method furnace building method has short service cycle and the number of used furnaces is between 10 and 100; meanwhile, the inner wall of the furnace hearth is easy to generate capillary cracks and further develops into chaps in the repeated heating and cooling processes of the furnace lining, and the defects of more later maintenance and the like are overcome.
Disclosure of Invention
The invention aims to provide a furnace building method of a medium-frequency induction furnace, which can improve the working conditions of furnace building, shorten the furnace building period, and simultaneously has the characteristics of prolonging the service life of a hearth and the like.
In order to achieve the aim, the invention provides a furnace building method of a medium-frequency induction furnace, which comprises the following specific steps:
1) preparation of furnace lining material: adding high-purity microcrystalline quartz sand into a high-temperature sintering agent and a mineralizing agent, mixing, and uniformly stirring to obtain the furnace lining material;
2) preparing a lining fetal membrane: manufacturing a lining fetal membrane by adopting a steel plate according to the size of a hearth;
3) and (3) knotting the furnace bottom: laying a heat insulation protective layer on the inner wall of the induction coil, laying asbestos cloth or an asbestos plate on the furnace bottom refractory bricks with the heat insulation protective layer, laying the refractory material prepared in the step 1) on the asbestos plate, and tamping the refractory material with a hand hammer to obtain a furnace bottom after the refractory material is strickled;
4) knotting the furnace wall: placing a furnace lining template in a furnace bottom, positioning and timely fastening a furnace opening by using a wood film, adding the refractory material obtained in the step 1) into an inner cavity of a ramming layer in batches along the outer wall of the furnace lining template, and ramming by adopting a tamping fork to control the circumferential point movement of the inner cavity to prepare a furnace wall;
5) baking: baking the furnace bottom, the furnace wall and the furnace opening, wherein the baking temperature is set to 1550-;
6) and (3) sintering: crystal transformation occurs in the furnace bottom, the furnace wall and the furnace opening through the furnace baking, so that a sintering layer, a semi-sintering layer, a hardening layer and a loosening layer are formed on the furnace bottom, the furnace wall and the furnace opening from inside to outside, and the furnace building is completed.
Preferably, the thickness of the steel plate in the step 2) is set to be 2-3 mm.
Preferably, the heat insulation protective layer in the step 3) is formed by laying 1-2 layers of asbestos cloth with the thickness of 2mm, and the specific laying method of the heat insulation protective layer comprises the following steps: and paving the asbestos cloth into a cylindrical structure with the width of the joint lap seam not less than 80mm along the inner circle of the induction coil.
Preferably, the thickness of the refractory laid on the asbestos sheet in the step 3) is set to 70-80 mm.
Preferably, the specific method for placing the lining tire membrane in the step 4) is as follows: when the furnace lining fetal membrane is placed in the furnace bottom, three positioning feelers are placed between the inner wall of the induction coil and the furnace lining fetal membrane, so that the relative error between the center of the furnace lining fetal membrane and the center of the induction coil is ensured to be between 0 and 3 mm.
Preferably, the ramming sequence in the step 4) is as follows: firstly, tamping the parts which are tightly attached to the inner wall of the induction coil and the outer wall of the fetal membrane, and then tamping the central part.
Preferably, in the step 5), the furnace bottom, the furnace wall and the furnace mouth are naturally dried for 2 hours before being dried.
Preferably, the step 5) of baking the furnace bottom, the furnace wall and the furnace mouth comprises the following specific steps: baking for 2-3 hours at low power of 20% of normal power, baking for 2 hours or more at normal power after the contact side of the furnace wall and the outer wall of the lining fetal membrane forms certain strength.
The technical scheme of the invention has the following beneficial effects:
(1) the refractory material for preparing the furnace lining of the invention has small quartz crystal grains (the grain size is 6-260 mu m) and does not adopt H used in the traditional process3BO3And under the action of the mineralizer, the alpha-phosphorous quartz after sintering in the first furnace is high in conversion rate, so that the furnace drying time is short, and the furnace drying furnace has excellent volume stability, thermal stability and high-temperature strength.
(2) According to the invention, the lining fetal membrane is made of the steel plate, so that the lining fetal membrane does not need to be taken out during the first smelting and can be directly used as furnace charge.
(3) According to the invention, the heat insulation protective layer is arranged at the bottom of the furnace, so that the heat insulation effect of the medium-frequency induction furnace is effectively ensured.
(4) In the invention, the furnace is built by adopting a dry method, because the fluidity of the refractory material of the furnace lining is better, the dead angle position is easy to be pounded, and simultaneously, because no other impurities are mixed into the sand of the furnace lining, the components of the furnace lining are single and pure, and the sintering effect is good.
(5) After the invention passes through the complete primary oven, the intermediate frequency induction furnace forms 4 layers from inside to outside: the thickness of the sintering layer is about 10mm after the first furnace drying is finished, the sintering layer becomes thicker gradually after 5-10 times of normal smelting, and finally the thickness of the sintering layer can reach 30-40% of the thickness of the whole furnace lining, so that the medium-frequency induction furnace has the characteristics of high strength and compact structure.
(6) After the furnace is completely baked for one time, a loose layer is formed between the furnace wall and the hardened layer, so that the furnace has the characteristics of insulation, heat insulation and the like, and because sand grains are easy to loosen, the displacement caused by volume expansion or shrinkage during heating or cooling of the furnace lining can be effectively counteracted, and the purpose of prolonging the service life of the medium-frequency induction furnace is realized.
(7) The furnace lining material does not need to be added with additives such as boric acid, silica sol and the like, has good fluidity, only needs to be pounded by a tamping fork guide type, and can be fully pounded at the corner or joint position without loose parts; the refractory furnace lining material has low water content, water is easy to discharge, water in the furnace lining can be basically eliminated by one-time furnace baking, and the furnace lining is kept dry in the smelting process, so that the refractory furnace lining material has the characteristics of greatly prolonged service life and capability of smelting more than 200 furnaces by one-time furnace building.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the structure of a furnace lining in the present invention;
FIG. 2 is a schematic view of a furnace curve according to the present invention.
Wherein:
1: sintered layer, 2: half-winding layer, 3: hardened layer, 4: a dispersion layer.
Detailed Description
Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
In order to make the aforementioned objects, features, advantages, and the like of the present invention more clearly understandable, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the drawings of the present invention are simplified and are not to precise scale, and are provided for convenience and clarity in assisting the description of the embodiments of the present invention; the several references in this disclosure are not limited to the particular numbers in the examples of the figures; the directions or positional relationships indicated by ' front ' middle, ' rear ' left ', right ', upper ', lower ', top ', bottom ', middle ', etc. in the present invention are based on the directions or positional relationships shown in the drawings of the present invention, and do not indicate or imply that the devices or components referred to must have a specific direction, nor should be construed as limiting the present invention.
Referring to fig. 1 and 2, the furnace building method of the medium frequency induction furnace provided by the invention specifically comprises the following steps:
1. preparation of furnace lining material: the furnace lining material is prepared by firstly using an acid refractory material, adopting high-purity microcrystalline quartz sand and powder, adding a high-temperature sintering agent and a mineralizing agent, and mixing, wherein the chemical components are detailed in a table 1:
table 1: statistical table of chemical composition of furnace lining material (without sintering agent)
| Name (R) | SiO2 | Al2O3 | Fe2O | Na2O+K2 | H2O |
| Ratio (%) | ≥97.5 | ≤0.72 | ≤0.41 | ≤0.1 | ≤0.5 |
Table 2: statistical table of physical properties of furnace lining material
| Particle size | Density of material | The recommended use temperature (. degree.C.) | Maximum operating temperature (. degree. C.) |
| ≤4mm | 2.1g/cm3 | 1500-1550 | 1600 |
| ≤4mm | 2.1g/cm3 | 1530-1580 | 1620 |
| ≤4mm | 2.1g/cm3 | 1560-1600 | 1650 |
As shown in Table 2, the furnace lining material does not adopt H3BO3 used in the traditional process due to small crystal grains (the crystal grain size is 6-260 μm), and due to the action of a mineralizer, the alpha-phosphorus quartz after being sintered by a first furnace is high in conversion rate, so that the furnace is short in furnace baking time, and has excellent volume stability, thermal stability and high-temperature strength.
2. Preparing a lining fetal membrane: the furnace is made of a steel plate with the thickness of 2-3mm according to the size of a hearth.
3. And (3) knotting the furnace bottom: firstly, clinging 1-2 layers of asbestos cloth with the thickness of 2mm to the inner wall of the induction coil, folding and rolling the lower edge of the asbestos cloth towards the inner wall of the induction coil, then laying 2-3 layers of 6-10mm thick asbestos cloth or asbestos plate on a refractory brick at the bottom of the induction coil, and ensuring that the joint lap width of the asbestos plate is not less than 80 mm; laying a layer of furnace lining material with the thickness of 70-80mm on the furnace bottom, striking off, tamping by a hand hammer (a pneumatic pounding) and striking flat to obtain the furnace bottom.
4. Knotting the furnace wall: after the furnace bottom is knotted, placing a lining moulding bed to knot the furnace wall; after the lining fetal membranes are calibrated, the furnace mouth can be positioned by a wood mold, fastened in time and compacted by a weight; when the lining fetal membranes are placed and positioned, the furnace wall is tamped by the tamping forks.
Preferably, when the lining tire membrane is placed, the center of the lining tire membrane is ensured to be aligned with the center of the induction coil, and the error is not allowed to exceed 3 mm.
Preferably, the concrete method for ramming the furnace wall comprises the following steps: adding knotted sand materials into the inner cavity of the knotting layer in batches along the outer wall of the lining tire membrane of the furnace lining, wherein the thickness of each batch of materials is about 20-50 mm, and in the knotting process, in order to ensure the knotting compactness of the furnace lining, the impact point of a tamping fork moves along the circumference of the inner cavity to tamp;
preferably, the ramming sequence is that the part clinging to the inner wall of the induction ring and the outer wall of the fetal membrane is rammed firstly, and then the central part is rammed.
5. Baking: the baking oven comprises four stages of natural drying, low-power baking oven, high-power baking oven and heat preservation (see figure 2), and the specific implementation steps are as follows:
A. naturally drying for 2 hours after the furnace is built;
B. baking the furnace for 2-3 hours at a low power of 20% of the normal power;
C. and (5) baking the furnace for more than 2 hours at normal power to finish baking the furnace.
6: and (3) sintering: after the whole primary oven, the oven bottom, the oven wall and the oven mouth form 4 layers from inside to outside: a sintered layer 1, a semi-sintered layer 2, a hardened layer 3, and a loose layer 4 (shown in fig. 1); after the first furnace drying is finished, the thickness of the sintering layer is controlled to be 10mm, and after 5-10 times of normal smelting, the sintering layer gradually becomes thicker and finally reaches 30-40% of the thickness of the whole furnace lining.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A furnace building method of a medium-frequency induction furnace specifically comprises the following steps:
1) preparation of furnace lining material: adding high-purity microcrystalline quartz sand into a high-temperature sintering agent and a mineralizing agent, mixing, and uniformly stirring to obtain the furnace lining material;
2) preparing a lining fetal membrane: manufacturing a lining fetal membrane by adopting a steel plate according to the size of a hearth;
3) and (3) knotting the furnace bottom: laying a heat insulation protective layer on the inner wall of the induction coil, laying asbestos cloth or an asbestos plate on the furnace bottom refractory bricks with the heat insulation protective layer, laying the refractory material prepared in the step 1) on the asbestos plate, and tamping the refractory material with a hand hammer to obtain a furnace bottom after the refractory material is strickled;
4) knotting the furnace wall: placing a furnace lining template in a furnace bottom, positioning and timely fastening a furnace opening by using a wood film, adding the refractory material obtained in the step 1) into an inner cavity of a ramming layer in batches along the outer wall of the furnace lining template, and ramming by adopting a tamping fork to control the circumferential point movement of the inner cavity to prepare a furnace wall;
5) baking: baking the furnace bottom, the furnace wall and the furnace opening, wherein the baking temperature is set to 1550-;
6) and (3) sintering: crystal transformation occurs in the furnace bottom, the furnace wall and the furnace opening through the furnace baking, so that a sintering layer, a semi-sintering layer, a hardening layer and a loosening layer are formed on the furnace bottom, the furnace wall and the furnace opening from inside to outside, and the furnace building is completed.
2. The furnace building method of the medium frequency induction furnace according to claim 1, characterized in that: the thickness of the steel plate in the step 2) is set to be 2-3 mm.
3. The furnace building method of the medium frequency induction furnace according to claim 1, characterized in that: the heat insulation protective layer in the step 3) is of 1-2 layers of asbestos cloth structures, and the thickness of the asbestos cloth is set to be 2 mm.
4. The furnace building method of the medium frequency induction furnace according to claim 3, characterized in that: the specific laying method of the heat insulation protective layer comprises the following steps: and paving the asbestos cloth into a cylindrical structure with the width of the joint lap seam not less than 80mm along the inner circle of the induction coil.
5. The furnace building method of the medium frequency induction furnace according to claim 4, characterized in that: the thickness of the asbestos board bedding in the step 3) is set to be 6-10 mm.
6. The furnace building method of the medium frequency induction furnace according to claim 5, characterized in that: the thickness of the refractory material laid on the asbestos board in the step 3) is set to be 70-80 mm.
7. The furnace building method of the medium frequency induction furnace according to claim 1, characterized in that: the specific method for placing the lining tire membrane in the step 4) is as follows: when the furnace lining fetal membrane is placed in the furnace bottom, three positioning feelers are placed between the inner wall of the induction coil and the furnace lining fetal membrane, so that the relative error between the center of the furnace lining fetal membrane and the center of the induction coil is ensured to be between 0 and 3 mm.
8. The furnace building method of the medium frequency induction furnace according to claim 7, characterized in that: the tamping sequence in the step 4) is as follows: firstly, tamping the parts which are tightly attached to the inner wall of the induction coil and the outer wall of the fetal membrane, and then tamping the central part.
9. The furnace building method of the medium frequency induction furnace according to claim 1, characterized in that: and in the step 5), the furnace bottom, the furnace wall and the furnace opening are naturally dried for 2 hours before being dried.
10. The furnace building method of the medium frequency induction furnace according to claim 9, characterized in that: the furnace baking process for the furnace bottom, the furnace wall and the furnace opening in the step 5) comprises the following specific steps: baking for 2-3 hours at low power of 20% of normal power, baking for 2 hours or more at normal power after the contact side of the furnace wall and the outer wall of the lining fetal membrane forms certain strength.
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| CN202011466261.4A CN112595119A (en) | 2020-12-13 | 2020-12-13 | Furnace building method for medium-frequency induction furnace |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216334A (en) * | 2021-12-20 | 2022-03-22 | 广东韶钢松山股份有限公司 | Intermediate frequency induction smelting furnace and baking method thereof |
| CN114383390A (en) * | 2021-12-30 | 2022-04-22 | 潍坊信合节能科技有限公司 | Medium-frequency induction diathermy furnace and medium-frequency induction diathermy furnace lining drying process |
| CN114688880A (en) * | 2022-03-25 | 2022-07-01 | 滨州市宏诺新材料有限公司 | Furnace building method capable of prolonging service life of intermediate frequency furnace |
| CN115900352A (en) * | 2022-12-12 | 2023-04-04 | 常州创明磁性材料科技有限公司 | Furnace building mold and furnace building method for medium-frequency induction furnace |
-
2020
- 2020-12-13 CN CN202011466261.4A patent/CN112595119A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216334A (en) * | 2021-12-20 | 2022-03-22 | 广东韶钢松山股份有限公司 | Intermediate frequency induction smelting furnace and baking method thereof |
| CN114216334B (en) * | 2021-12-20 | 2023-10-31 | 广东韶钢松山股份有限公司 | Medium frequency induction smelting furnace and baking method thereof |
| CN114383390A (en) * | 2021-12-30 | 2022-04-22 | 潍坊信合节能科技有限公司 | Medium-frequency induction diathermy furnace and medium-frequency induction diathermy furnace lining drying process |
| CN114688880A (en) * | 2022-03-25 | 2022-07-01 | 滨州市宏诺新材料有限公司 | Furnace building method capable of prolonging service life of intermediate frequency furnace |
| CN115900352A (en) * | 2022-12-12 | 2023-04-04 | 常州创明磁性材料科技有限公司 | Furnace building mold and furnace building method for medium-frequency induction furnace |
| CN115900352B (en) * | 2022-12-12 | 2023-12-01 | 常州创明磁性材料科技有限公司 | Medium frequency induction furnace building mold and furnace building method thereof |
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