Coke oven door and manufacturing method thereof

Abstract

The invention relates to the technical field of coking production, in particular to a coke oven door which comprises an oven door frame formed by a metal web and an oven door knife edge, dovetail anchoring nails are fixedly connected in the oven door frame, a heat insulation layer is arranged in the oven door frame, the middle of the section of the heat insulation layer is a protruding part, and the upper surface of the heat insulation layer is in a step shape with the high middle and the two low sides. A high-temperature-resistant heat insulation layer is arranged above the protruding part, a castable layer is arranged above the heat insulation layer and the high-temperature-resistant heat insulation layer, and the top of the castable layer is higher than the furnace door knife edge. The thickness of the coke oven door lining is reduced, and meanwhile the strength requirement of the coke oven door is met. And compared with other thermal insulation materials, the zirconium-containing aluminum silicate fiber blanket and the aluminum silicate fiber blanket are more compact, and tamping of the refractory material of the working layer is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of coking production, and particularly to a coke oven door and a manufacturing method thereof. Background Art

[0002] The existing coke oven is a regenerative chamber divided type, double-connected flue, coke oven gas bottom injection, blast furnace gas side injection, down-regulated reheating coke oven, with a production capacity of 2.55 million t / a.

[0003] The coke oven door is used to seal the carbonization chamber of the coke oven, playing a role of sealing and heat insulation. At present, most of the lining bricks of the coke oven door are machine-pressed small bricks made of cordierite and diatomite, which are embedded in the brick grooves of the oven door through masonry construction. Due to the small brick size and only being bonded with refractory mud, the integrity of the oven door lining is poor. During use, due to numerous brick joints on the working surface and tiny pores on the brick surface, it is easily eroded by harmful substances such as tar and graphite, resulting in a reduction in the strength of the refractory material, a deterioration of the heat insulation effect, and the formation of a carbon deposit layer on the brick surface that is difficult to remove, affecting the use effect, causing production difficulties, and affecting the normal production order.

[0004] Currently, in the industry, the oven door brick structure is mainly used for oven door sealing, and the main improvement is to change the material of the oven door brick to increase the heat insulation function. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a coke oven door that reduces the thickness of the inner lining of the coke oven door while meeting the strength requirements of the coke oven door.

[0006] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0007] A coke oven door includes an oven door frame formed by a metal web and an oven door knife edge. Dove-tail anchor nails are fixedly connected inside the oven door frame. An insulating layer is provided inside the oven door frame. The middle part of the cross-section of the insulating layer is a convex part, that is, the upper surface of the insulating layer is a stepped shape that is high in the middle and low on both sides. A high-temperature resistant insulating layer is provided above the convex part. A casting material layer is provided above the insulating layer and the high-temperature resistant insulating layer, and the top of the casting material layer is higher than the oven door knife edge.

[0008] The insulating layer is made of a ceramic fiber blanket.

[0009] The high-temperature resistant insulating layer is made of a zirconium-containing ceramic fiber blanket.

[0010] The ratio of the height a of the convex part of the insulating layer to the distance b from the convex part to the oven door knife edge is 3:(2 - 2.5).

[0011] The thickness of the high-temperature resistant insulating layer is 20 - 30 mm.

[0012] The physical and chemical indexes of the castable for the castable layer: bulk density: 2600 - 2650 kg / m 3 ; refractoriness under load 1730 °C; compressive strength ≥ 70 MPa; flexural strength ≥ 8 MPa.

[0013] A manufacturing method of a coke oven door, the steps including:

[0014] 1) Fabricate the door frame.

[0015] 2) Drill holes in the web of the door frame as the installation holes for the dovetail anchor nails.

[0016] 3) Install the dovetail anchor nails into the installation holes and weld them in place.

[0017] 4) First, lay the alumina-silica fiber blanket in layers inside the door frame, with staggered joints between layers. After the height reaches 200 - 230 mm, continue to lay in the middle part, without laying on both sides. After the height in the middle part reaches 260 - 290 mm, continue to lay the zirconium-containing alumina-silica fiber blanket above the alumina-silica fiber blanket in the middle part, and the thickness of the zirconium-containing alumina-silica fiber blanket is 15 - 25 mm.

[0018] 5) Build a mold on the door frame and pour the castable into the cavity above the alumina-silica fiber blanket and the zirconium-containing alumina-silica fiber blanket in the mold.

[0019] 6) Dry and form, then remove the mold.

[0020] Compared with the existing technology, the beneficial effects of the present invention are:

[0021] 1. The present invention thins the lining thickness of the coke oven door while meeting the strength requirements of the coke oven door.

[0022] 2. The door has stronger sealing and heat insulation properties: The zirconium-containing alumina-silica fiber blanket and the alumina-silica fiber blanket are denser than other thermal insulation materials, which is beneficial to the ramming of the refractory material in the working layer. The rigid amorphous refractory material (castable) has good thermal shock resistance and high strength. While reducing the weight, other application indexes such as strength are not affected. Due to the use of thermal insulation materials, the heat dissipation from the coke oven door is significantly reduced, which can effectively reduce the heat consumption of the coke oven.

[0023] The inside of the door has anti-coking and anti-collapse properties: Due to the optimization of the product material structure, the surface of the door is flat and smooth, improving the anti-coking and anti-collapse properties inside the door, and reducing the labor intensity of manually cleaning the coking on the inner lining of the door. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the present invention.

[0025] In the figure: 1, metal web; 2, furnace door knife edge; 3, dovetail anchor nail; 4, heat insulation layer; 5, convex part; 6, high-temperature heat insulation layer; 7, castable layer. Specific embodiments

[0026] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0027] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0028] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0029] Such as Figure 1 , a coke oven door includes a door frame formed by a metal web 1 and a furnace door knife edge 2. A dovetail anchor nail 3 is fixedly connected inside the door frame. A heat insulation layer 4 is provided inside the door frame. The middle of the cross-section of the heat insulation layer 4 is a convex part 5, that is, the upper surface of the heat insulation layer 4 is a stepped shape with a high middle and low sides. A high-temperature heat insulation layer 6 is provided above the convex part 5. A castable layer 7 is provided above the heat insulation layer 4 and the high-temperature heat insulation layer 6. The top of the castable layer 7 is higher than the furnace door knife edge 2.

[0030] The ratio of the height a of the convex part 5 of the heat insulation layer 4 to the distance b from the convex part 5 to the furnace door knife edge 2 is 3:(2 - 2.5).

[0031] The heat insulation layer 4 is made of a silica-aluminum fiber blanket.

[0032] The described high-temperature heat-insulating layer 6 is made of zirconium-containing aluminosilicate fiber blanket.

[0033] The height on both sides of the cross-section of the described heat-insulating layer 4 is 200 - 230 mm.

[0034] The height of the convex part of the described heat-insulating layer 4 is 30 - 90 mm.

[0035] The thickness of the described high-temperature heat-insulating layer 6 is 20 - 30 mm.

[0036] The physical and chemical indexes of the castable for the described castable layer 7: bulk density: 2600 - 2650 kg / m 3 ; refractoriness 1730 °C; compressive strength ≥ 70 MPa; flexural strength ≥ 8 MPa.

[0037] A manufacturing method of a coke oven door, the steps include:

[0038] 1) Manufacture the door frame.

[0039] 2) Drill holes in the web 1 of the door frame as the installation holes for the dovetail anchor nails 3.

[0040] 3) Install the dovetail anchor nails 3 into the installation holes and weld them for fixation.

[0041] 4) First, lay the aluminosilicate fiber blanket in layers into the door frame, with staggered joints between layers. After the height reaches 200 - 230 mm, continue to lay the middle part, without laying on both sides. After the height of the middle part reaches 260 - 290 mm, continue to lay the zirconium-containing aluminosilicate fiber blanket above the aluminosilicate fiber blanket in the middle part, and the thickness of the zirconium-containing aluminosilicate fiber blanket is 15 - 25 mm;

[0042] 5) Build a mold on the door frame and pour the castable into the cavity above the aluminosilicate fiber blanket and the zirconium-containing aluminosilicate fiber blanket in the mold.

[0043] 6) Dry and form, and remove the mold.

[0044] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention. In addition, it should be noted that in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention does not explain various possible combination methods separately. In addition, any combination can be made between various different embodiments of the present invention as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.

[0045] To make the objectives, technical solutions, and technical effects of the present invention clearer, the technical solutions in the embodiments of the present invention will now be described clearly and completely. However, the embodiments described below are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art in combination with the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0046] Embodiment 1:

[0047] A coke oven door, the coke oven door is 500 mm wide and the total height of the oven door is 385 mm. It includes an oven door frame formed by a metal web 1 and an oven door edge 2, and the oven door edge 2 is 250 mm high.

[0048] Dovetail anchor nails 3 are fixedly connected within the oven door frame. An insulating layer 4 is provided within the oven door frame. The middle part of the cross-section of the insulating layer 4 is a convex part 5, the height a of the convex part 5 is 90 mm, and the distance b from the convex part 5 to the oven door edge 2 is 70 mm. The heights on both sides of the cross-section of the insulating layer 4 are 200 mm. The insulating layer 4 is made of aluminosilicate fiber blanket.

[0049] That is, the upper surface of the insulating layer 4 is a stepped shape with a higher middle and lower sides. A high-temperature resistant insulating layer 6 is provided above the convex part 5, and the thickness of the high-temperature resistant insulating layer 6 is 20 mm. The high-temperature resistant insulating layer 6 is made of zirconium-containing aluminosilicate fiber blanket.

[0050] A casting layer 7 is provided above the insulating layer 4 and the high-temperature resistant insulating layer 6. The top of the casting layer 7 is retracted and the edges are rounded. The casting material of the casting layer 7 is high-strength wear-resistant refractory plastic.

[0051] A manufacturing method of a coke oven door, the steps include:

[0052] 1) Manufacture the oven door frame;

[0053] 2) Drill 45 holes on the web 1 of the oven door frame, the hole diameter is Φ12 mm, and the spacing is 250 mm, as the installation holes for the dovetail anchor nails 3;

[0054] 3) Use Φ12 mm heat-resistant steel bars to make the vertical poles of the dovetail anchor nails 3, and use Φ8 mm heat-resistant steel bars to make the dovetail bars. The total height of the dovetail anchor nails is 365 mm, and the height of the dovetail part is 80 mm. Install the made dovetail anchor nails 3 into the installation holes and weld them in place;

[0055] 4) First, lay aluminosilicate fiber blankets in layers within the oven door frame, with staggered joints between layers. After reaching the height, continue to lay in the middle part, and do not lay on both sides. After reaching the height in the middle part, continue to lay zirconium-containing aluminosilicate fiber blankets above the aluminosilicate fiber blankets in the middle part until the designed height is reached;

[0056] 5) Build a mold on the oven door frame and pour high-strength wear-resistant refractory plastic into the cavity above the alumina-silicate fiber blanket and zirconium-containing alumina-silicate fiber blanket in the mold;

[0057] 6) Dry and form, then remove the mold.

[0058] Compared with the structure of the original coke oven door lining built with refractory bricks: the thickness of the original oven door lining is 485 mm, and the height of the carbonization chamber is 6.98 m 2 .

[0059] Through structural optimization and strengthening the functional application of refractories, the thickness of the oven door after the implementation of the project technology is 385 mm, increasing the space of the carbonization chamber: for each carbonization chamber, the increase is: 6.98×0.5×0.1×2 = 0.698 m 3 , with a cycle of 24 hours, the monthly increase in production can be 0.698×30 = 20.94 m 3 .

[0060] Calculation and comparison of the load per unit length of the oven door before and after implementation:

[0061] (1) Before implementation: 0.5×0.157×700 + 0.5×0.32×2100 = 390.95 kg;

[0062] (2) After implementation: 0.5×0.35×128 + 0.5×0.1×2650 = 154.9 kg.

[0063] Example 2:

[0064] A coke oven door, the width of the coke oven door is 500 mm, and the total height of the oven door is 390 mm. It includes an oven door frame formed by a metal web 1 and an oven door edge 2, and the height of the oven door edge 2 is 250 mm.

[0065] Fix a dovetail anchor nail 3 in the oven door frame. There is a heat insulation layer 4 in the oven door frame. The middle part of the cross-section of the heat insulation layer 4 is a convex part 5, the height a of the convex part 5 is 80 mm, and the distance b from the convex part 5 to the oven door edge 2 is 60 mm. The height of both sides of the cross-section of the heat insulation layer 4 is 210 mm. The heat insulation layer 4 is made of alumina-silicate fiber blanket.

[0066] That is, the upper surface of the heat insulation layer 4 is a stepped shape with a middle high and two sides low. There is a high-temperature heat insulation layer 6 above the convex part 5, and the thickness of the high-temperature heat insulation layer 6 is 15 mm. The high-temperature heat insulation layer 6 is made of zirconium-containing alumina-silicate fiber blanket.

[0067] There is a castable layer 7 above the heat insulation layer 4 and the high-temperature heat insulation layer 6. The top of the castable layer 7 is retracted and the edges are rounded. The castable of the castable layer 7 is high-strength wear-resistant refractory plastic.

[0068] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coke oven door, characterized in that: It includes a furnace door frame formed by a metal web and a furnace door knife edge, dovetail anchor nails are fixedly connected in the furnace door frame, a heat insulation layer is arranged in the furnace door frame, the middle part of the cross section of the heat insulation layer is a raised part, that is, the upper surface of the heat insulation layer is a stepped type with the middle high and the two sides low, a high temperature resistant heat insulation layer is arranged above the raised part, a castable layer is arranged above the heat insulation layer and the high temperature resistant heat insulation layer, and the top of the castable layer is higher than the furnace door knife edge.

2. A coke oven door according to claim 1, characterized in that: The heat insulation layer is made of aluminum silicate fiber blanket.

3. A coke oven door according to claim 1, characterized in that: The high temperature resistant heat insulating layer is made of a zirconium-containing aluminum silicate fiber blanket.

4. A coke oven door according to claim 1, characterized in that: The ratio of the height a of the raised portion of the heat insulation layer to the distance b from the raised portion to the knife edge of the furnace door is 3:(2-2.5).

5. A coke oven door according to claim 1, characterized in that: The thickness of the high temperature resistant heat insulation layer is 20-30 mm.

6. A coke oven door according to claim 1, characterized in that: Physical and chemical indicators of the castable layer: Bulk density: 2600-2650kg / m 3 ; Refractoriness 1730℃; Compressive strength ≥70MPa; Flexural strength ≥8MPa.

7. The method for manufacturing a coke oven door according to claim 1, characterized in that the steps include: 1) Make furnace door frame; 2) Drill holes on the web of the furnace door frame as mounting holes for dovetail anchors; 3) Install the dovetail anchor nail into the mounting hole and fix it by welding; 4) First, lay the aluminum silicate fiber blanket in layers in the furnace door frame, with staggered overlaps between the layers. After the height reaches 200-230mm, continue to lay the middle part, and stop laying on both sides. After the height of the middle part reaches 260-290mm, continue to lay the zirconium-containing aluminum silicate fiber blanket on the aluminum silicate fiber blanket in the middle. The thickness of the zirconium-containing aluminum silicate fiber blanket is 15-25mm; 5) Building a mold on the furnace door frame, and pouring the castable into the cavity above the aluminum silicate fiber blanket and the zirconium-containing aluminum silicate fiber blanket in the mold; 6) Drying, molding and demoulding.

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