Carbonization chamber structure for reducing coke pushing current of coke oven

Abstract

The utility model relates to a carbonization chamber structure for reducing coke pushing current of a coke oven, which is characterized in that an antifriction layer is arranged at the bottom of a carbonization chamber of the coke oven or the bottom of the carbonization chamber and two side walls of the carbonization chamber, the antifriction layer consists of glazed bricks or high-temperature-resistant and corrosion-resistant steel plates, and glaze surfaces of the glazed bricks are arranged towards the inner side of the carbonization chamber; the antifriction layer is in direct contact with the coke cake, and the friction coefficient between the antifriction layer and the coke cake is not greater than 0.4; the friction resistance between a coke cake and the bottom of the carbonization chamber or between the bottom of the carbonization chamber and the two side walls of the carbonization chamber in the coke pushing process is reduced through the antifriction layer, so that the coke pushing current is reduced, the coke production quality and yield are improved, and the service life of the coke oven is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of coke oven coking, in particular to a carbonization chamber structure for reducing the coke pushing current of a coke oven. Background Technique

[0002] The coke pushing current is an important parameter in the coke production process, generally referring to the maximum current value during the coke pushing process. The magnitude of the coke pushing current is related to many factors, such as the erosion and air leakage of the furnace wall, the maturity of the coke cake, the graphite formation on the wall and top of the carbonization chamber, and the shrinkage of the blended coal. When the coke pushing current is too large during coke oven coke pushing, even exceeding the specified maximum current, it will be difficult to push the coke, and even secondary coke pushing may be required. The excessive coke pushing current will also affect the production of the coke oven and the quality of the coke, cause great damage to the coke oven body, and is the main reason for the deformation of the coke oven body, seriously affecting the service life of the coke oven body.

[0003] There is a certain linear relationship between the coke pushing current and the coke pushing resistance, and the coke pushing resistance is related to the friction force between the coke cake and the coke oven. The greater the friction coefficient and the contact area between the coke cake and the coke oven, the greater the required thrust. The carbonization chambers of modern coke ovens are usually built with silica bricks, and the friction coefficient between the coke cake and the bottom of the carbonization chamber of the coke oven is generally 0.6 - 0.8. During coke pushing, since the coke cake at the furnace head is compressed, there is also a friction force between it and the two side walls of the carbonization chamber. Therefore, the comprehensive friction coefficient between the coke cake and the carbonization chamber wall can reach about 1.0.

[0004] The Chinese patent application with the publication number CN 110776935 A discloses "a method for reducing the stamping coke pushing current", the Chinese patent application with the publication number CN 103849412 A discloses "a coking blended coal method for reducing the coke pushing current", and the Chinese patent application with the publication number CN 110283613 A discloses "a blended coal method for reducing the coke pushing current during the coking production process", all of which aim to reduce the coke pushing current by adjusting the composition of the blended coal and improving the shrinkage performance of the coal cake. The Chinese patent application with the publication number CN 110655936 A discloses "a coke pushing process control method for reducing the coke pushing current during coking furnace discharging", mainly aiming to reduce the coke pushing current through the operation management of the production and coke pushing processes. There are also some other public literatures, mainly reducing the coke pushing current by improving the coke pushing device.

[0005] These above methods all have problems more or less, such as high energy consumption cost, complex process, poor production reactivity, and weak applicability. Therefore, at the present stage, how to effectively reduce the coke pushing current, extend the service life of the coke oven, and save operation costs at the same time is still an urgent problem to be solved. Summary of the Invention

[0006] The utility model provides a carbonization chamber structure for reducing the coke pushing current of a coke oven. By using materials with a smaller coefficient of friction at the bottom of the carbonization chamber or on both side walls of the carbonization chamber, the frictional resistance between the coke cake and the carbonization chamber during coke pushing is reduced, thereby reducing the coke pushing current, improving the quality and output of coke production, and prolonging the service life of the coke oven.

[0007] To achieve the above object, the utility model is implemented by the following technical solutions:

[0008] A carbonization chamber structure for reducing the coke pushing current of a coke oven, wherein a friction reducing layer is provided at the bottom of the carbonization chamber of the coke oven or on the bottom of the carbonization chamber and both side walls of the carbonization chamber. The friction reducing layer is composed of glazed bricks or high-temperature resistant and corrosion-resistant steel plates. The glazed surface of the glazed bricks is arranged facing the inner side of the carbonization chamber; the friction reducing layer is in direct contact with the coke cake, and the coefficient of friction between the two is not greater than 0.4; the frictional resistance between the coke cake and the bottom of the carbonization chamber or the bottom and both side walls of the carbonization chamber during coke pushing is reduced through the friction reducing layer, thereby reducing the coke pushing current.

[0009] Furthermore, the thickness of the glazed surface of the glazed bricks is not less than 1 mm.

[0010] Furthermore, the glazed bricks are arranged longitudinally along the entire length of the carbonization chamber; the height of the glazed bricks arranged on both side walls of the carbonization chamber is not lower than the height of the top surface of the coke cake; the glazed bricks are laid synchronously during the cold-state masonry of the coke oven, or laid after the hot-state baking of the coke oven, or laid as replaced refractory bricks during the hot-state furnace repair.

[0011] Furthermore, the glazed bricks are composed of a refractory brick body and a glazed surface. The refractory brick body is a silica brick, cordierite brick or clay brick; when the refractory brick body is a cordierite brick or clay brick, a sliding layer is provided between the glazed bricks serving as the friction reducing layer at the bottom of the carbonization chamber and the silica bricks laid at the bottom of the carbonization chamber.

[0012] Furthermore, the high-temperature resistant and corrosion-resistant steel plates are arranged longitudinally along the entire length of the carbonization chamber, and are fixedly connected to the corresponding furnace protection iron parts at both ends corresponding to the machine side and the coke side respectively.

[0013] Furthermore, the high-temperature resistant and corrosion-resistant steel plates are installed together with the furnace protection iron parts after the cold-state masonry of the coke oven, or installed after the baking of the coke oven.

[0014] Furthermore, the high-temperature resistant and corrosion-resistant steel plates are heat-resistant stainless steel plates or silicon nitride ceramic plates, and the thickness is not less than 10 mm.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] (1) By providing a material layer with a smaller coefficient of friction at the bottom of the carbonization chamber or on both side walls of the carbonization chamber, the frictional resistance between the coke cake and the carbonization chamber is reduced, thereby reducing the coke pushing current. The coke pushing current can be reduced by more than 50%, greatly saving the operation cost.

[0017] (2) After the pusher current is reduced, the pusher jam and secondary coke accidents are greatly avoided, which is beneficial to stabilizing the production operation of the coke oven, increasing the coke output, while reducing the damage of the pusher operation to the coke oven body, especially the wall of the carbonization chamber on the machine side, and effectively extending the service life of the coke oven.

[0018] (3) It is easy to implement, low in cost and quick in effect. Description of the Drawings

[0019] Figure 1 is a partial cross-section of the coke oven described in the present utility model Figure 1 .

[0020] Figure 2 is Figure 1 a side view of.

[0021] Figure 3 is a partial cross-section of the coke oven described in the present utility model Figure 2 .

[0022] In the figure: 1. Inclined flue 2. Combustion chamber 3. Carbonization chamber 4. Coke cake line 5. Glazed brick on the side wall 6. Glazed brick at the bottom 7. High-temperature resistant stainless steel plate Detailed Embodiments

[0023] The following further describes the detailed embodiments of the present utility model with reference to the drawings:

[0024] The present utility model is a carbonization chamber structure for reducing the pusher current of a coke oven. As Figures 1 - 3 shown, the coke oven consists of a regenerator, an inclined flue 1, a combustion chamber 2, a carbonization chamber 3 and a furnace top. Materials with a smaller coefficient of friction, such as refractory bricks with glazed surfaces or high-temperature resistant and corrosion-resistant steel plates, are used at the bottom of the carbonization chamber 3 or on both side walls of the carbonization chamber 3 to reduce the frictional resistance between the coke cake and the bottom and both side walls of the carbonization chamber 3 during the pusher process, thereby reducing the pusher current.

[0025] Modern coke ovens are generally built with silica bricks. The coefficient of friction between the coke cake and the bottom of the coke oven carbonization chamber is generally 0.6 - 0.8. Considering that there is also frictional resistance between the compressed coke cake and both side walls of the carbonization chamber 3 during pusher operation, the comprehensive coefficient of friction between the coke cake and the bottom and both side walls of the carbonization chamber 3 can reach about 1.0. After using glazed bricks or high-temperature resistant and corrosion-resistant steel plates, the coefficient of friction can be reduced to less than 0.3. Under normal production conditions where there is no large-area erosion and damage on the wall of the carbonization chamber 3, good graphite formation in the carbonization chamber, and good maturity of the coke cake, the pusher current can be reduced by more than 50%, thereby greatly reducing the operation cost of the pusher vehicle, while reducing the damage of pusher operation to the coke oven body and extending the service life of the coke oven.

[0026] The glazed brick described in the present utility model is a surface-glazed silica brick or other surface-glazed refractory bricks. The thickness of the glaze layer is not less than 1 mm, and there are no phenomena such as cracking, softening, and flowing of the glaze layer at the working temperature of the carbonization chamber 3 (the temperature in the carbonization chamber is generally below 1100 °C). Due to the relatively large expansion coefficient of silica bricks, a glaze layer with an expansion amount similar to that of silica bricks needs to be equipped to improve the service life of the glaze layer of the glazed silica brick; in addition to silica bricks, refractory bricks made of cordierite, clay, etc. can also be used, which have a longer service life, but their high-temperature performance and high-temperature wear resistance are slightly worse.

[0027] The glazed brick described in the present utility model is arranged longitudinally along the length of the carbonization chamber 3. It can be arranged only at the bottom of the carbonization chamber 3, or can be arranged at both the bottom 3 of the carbonization chamber and on both side walls of the carbonization chamber 3 at the same time, and the glaze layer is provided only on the side in contact with the coke. The glazed bricks at the bottom of the carbonization chamber 3 are laid longitudinally along the machine side - coke side, and the height of the glazed bricks on both side walls of the carbonization chamber 3 is not lower than the height of the top surface of the coke cake (abbreviated as the coke cake line 4). The glazed bricks can be laid synchronously with the coke oven body during the cold masonry of the coke oven, or can be laid on the bottom of the carbonization chamber 3 after hot baking, or can be used to replace the refractory bricks at the bottom of the carbonization chamber 3 during hot furnace repair.

[0028] It is worth mentioning that since the side wall of the carbonization chamber 3 needs to bear the pressure of the furnace top and the furnace top vehicles, glazed silica bricks with a high softening point under load should be used for masonry as much as possible. For the glazed bricks laid at the bottom of the carbonization chamber 3, their expansion amount should be consistent with that of the coke oven body. The glazed bricks can be directly laid with fire clay, but when using glazed bricks with a large difference in expansion coefficient from silica bricks (such as clay bricks or cordierite bricks), a sliding layer needs to be provided between the bottom glazed brick 6 and the silica brick at the bottom of the carbonization chamber.

[0029] The high-temperature and corrosion-resistant steel plate described in the present utility model is preferably a heat-resistant stainless steel plate such as SUS310, SUS314, etc., and its heat-resistant temperature can reach above 1200 °C, which is widely used in high-temperature kilns. The surface of the high-temperature and corrosion-resistant steel plate should be polished smoothly to ensure that it has a small friction coefficient, and the thickness is not less than 10 mm. The high-temperature and corrosion-resistant steel plate should have no softening, deformation, and corrosion phenomena in the high-temperature working environment of the carbonization chamber 3.

[0030] The high-temperature and corrosion-resistant steel plate used as the antifriction layer is laid longitudinally along the length of the carbonization chamber 3 (machine side - coke side). The high-temperature and corrosion-resistant steel plate laid at the bottom of the carbonization chamber 3 is respectively connected and fixed to the corresponding furnace door frames, protection plates and other furnace protection iron parts at both ends of the machine side and the coke side to avoid displacement during the coke pushing process. Bolts can be used to fix the high-temperature and corrosion-resistant steel plate and the furnace protection iron parts, which is convenient for future replacement. The high-temperature and corrosion-resistant steel plate can be installed together with the furnace protection iron parts after the cold masonry of the coke oven, or can be installed separately after baking. In addition, the high-temperature and corrosion-resistant steel plate can use large-size steel plates, and the welds should be as few as possible during welding and splicing, and the welds need to be polished smoothly.

[0031] The anti-friction layer of the present utility model can also adopt other high-temperature and corrosion-resistant materials. On the premise of meeting the use requirements in the working environment of the carbonization chamber, it is necessary to ensure that the friction coefficient with the coke cake is not greater than 0.4, such as silicon nitride ceramics, etc., and the friction coefficient can reach 0.1.

[0032] To make the purpose, technical solution and technical effects of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below. However, the embodiments described below are only a part of the embodiments of the present utility model, rather than all embodiments. Combining the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.

[0033]

Embodiment 1

[0034] As Figure 1 , Figure 2 shown, in this embodiment, the bottom and both side walls of the carbonization chamber 3 are built with glazed silica bricks. The bottom glazed bricks 6 and the side wall glazed bricks 5 are both provided with a glazed surface on the side facing the carbonization chamber 3. The thickness of the glazed surface is 3 mm, and the friction coefficient of the glazed surface is 0.3.

[0035] In this embodiment, the glazed silica bricks are cold-built together with the coke oven body. The side wall glazed bricks 5 and the bottom glazed silica bricks 6 are both laid longitudinally along the machine side - coke side direction, and only high-alumina bricks are used for building at the machine side coke oven head and the coke side oven head to avoid damage to the silica bricks at the oven head caused by frequent opening of the oven door.

[0036] In this embodiment, the top surface height of the side wall glazed bricks 5 is 10 cm higher than the top height of the coke cake (coke cake line 4).

[0037] In this embodiment, under the conditions that there is no large-area erosion and damage on the wall surface of the carbonization chamber 3, good graphite formation in the carbonization chamber, and good maturity of the coke cake, during normal production coking pushing, the comprehensive friction coefficient of the bottom and both side walls of the carbonization chamber 3 is about 0.4. Compared with before the implementation, the coking pushing current is reduced by more than 50%.

[0038]

Embodiment 2

[0039] As Figure 3As shown, in this embodiment, after the coke oven body is built, the furnace protection iron parts are installed, and then the oven drying operation is carried out. After the oven drying is completed, a layer of high-temperature resistant stainless steel plate 7 of model SUS314 is laid at the bottom of the carbonization chamber 3. Its heat-resistant temperature can reach 1250 °C. The thickness of the high-temperature resistant stainless steel plate 7 is 20 mm, and the width is 10 mm smaller than the hot width of the carbonization chamber. The top surface of the high-temperature resistant stainless steel plate 7 in direct contact with the coke is polished, and the friction coefficient is below 0.2. The total length of the high-temperature resistant stainless steel plate 7 is 18600 mm, and it is composed of three rectangular steel plates spliced together. An X-shaped groove is opened at the splicing part for welding, and after welding, the weld is polished to make the weld height and smoothness consistent with the surface of the steel plate body.

[0040] In this embodiment, the high-temperature resistant stainless steel plate 7 is bolted to the furnace door frame in the corresponding furnace protection iron parts at both ends of the machine side and the coke side to prevent the steel plate from shifting during coke pushing.

[0041] During normal coke pushing production, when there is no large-area erosion and damage on the wall of the carbonization chamber 3, the graphite in the carbonization chamber is in good condition, and the coking cake maturity is good, the comprehensive friction coefficient at the bottom and both side walls of the carbonization chamber 3 is about 0.4. Compared with before the implementation, the coke pushing current is reduced by more than 50%.

[0042] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A coke chamber structure for reducing the coke pushing current of a coke oven, characterized in that, A friction reduction layer is provided at the bottom of the coking chamber of the coke oven or between the bottom of the coking chamber and the two side walls of the coking chamber. The friction reduction layer is composed of glazed bricks or high-temperature resistant and corrosion-resistant steel plates. The glazed surface of the glazed bricks is arranged facing the inside of the coking chamber; the friction reduction layer is in direct contact with the coke cake, and the friction coefficient between the two is not greater than 0.4; the friction resistance between the coke cake and the bottom of the coking chamber or between the bottom of the coking chamber and the two side walls of the coking chamber during the coke pushing process is reduced through the friction reduction layer, thereby reducing the coke pushing current.

2. The coking chamber structure for reducing the coke pushing current according to claim 1, characterized in that, The thickness of the glazed surface of the glazed bricks is not less than 1 mm.

3. The coke chamber structure for reducing the coke pushing current according to claim 1, characterized in that, The glazed bricks are arranged longitudinally throughout the coking chamber; the height of the glazed bricks provided on the two side walls of the coking chamber is not lower than the height of the top surface of the coke cake; the glazed bricks are laid synchronously during the cold-state masonry of the coke oven, or laid after the hot-state baking of the coke oven, or laid as replaced refractory bricks during the hot-state furnace repair.

4. A coke chamber structure for reducing the coke pushing current according to claim 1 or 2 or 3, characterized in that, The glazed bricks are composed of a refractory brick body and a glazed surface. The refractory brick body is silica brick, cordierite brick or clay brick; when the refractory brick body is cordierite brick or clay brick, a sliding layer is provided between the glazed bricks serving as the friction reduction layer at the bottom of the coking chamber and the silica bricks laid at the bottom of the coking chamber.

5. The coke chamber structure for reducing the coke pushing current according to claim 1, characterized in that, The high-temperature resistant and corrosion-resistant steel plates are arranged longitudinally throughout the coking chamber and are fixedly connected to the corresponding furnace protection iron parts at both ends corresponding to the machine side and the coke side respectively.

6. The coking chamber structure for reducing the coke pushing current according to claim 1, characterized in that, The high-temperature resistant and corrosion-resistant steel plates are installed together with the furnace protection iron parts after the cold-state masonry of the coke oven, or installed after the baking of the coke oven.

7. A coke chamber structure for reducing the coke pushing current according to claim 5 or 6, characterized in that The high-temperature resistant and corrosion-resistant steel plates are heat-resistant stainless steel plates or silicon nitride ceramic plates, and the thickness is not less than 10 mm.

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