Large tamping coke oven briquette and forming and tamping method thereof
By combining arithmetic sequence layering and gradient tamping, the coal cake structure is optimized, and the coal cake stability and gas consumption problems of large tamping coke ovens are solved, and efficient production and low carbon emissions are achieved.
Patent Information
- Application Number
- CN202510881077.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-27
- Publication Date
- 2025-08-08
AI Technical Summary
In the process of large-scaleization, traditional tamping coke ovens have problems such as insufficient stability of coal cakes and excessive gas consumption, especially in 6.73m coke ovens, which leads to high coal collapse rate, low production efficiency and increased energy consumption.
Arithmetic series layered tamping method is combined with gradient tamping method. By adjusting the height and bulk density of the coal cake layer by layer, combined with the overlapping and intersection design, a mutually interlayer interface is formed, reducing the tamping work and density of the top layer and optimizing heat conduction.
Significantly reduce the coal collapse rate, improve the stability of coal cakes and compressive and shearing properties, uniform heating, reduce gas consumption, and reduce production costs and carbon emissions.
Smart Images
Figure CN120442267A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of coking, and in particular relates to a large-scale ramming coke oven coal cake and a forming and ramming method thereof. Background Art
[0002] Ramming coking technology is a type of contemporary coking technology. Coking coal is rammed into briquettes with a certain density and strength by ramming machinery, and the briquettes are loaded into the coke oven for coking using a side-loading method. This technology can increase the proportion of non-coking coal in coking coal, save resources, and significantly improve the quality of coke and the efficiency of coke production. It is an important technical measure for the steel industry to achieve energy conservation and emission reduction. As the core equipment for producing high-quality metallurgical coke, the technological advancement of the ramming coke oven directly affects the quality of coke, production efficiency and energy consumption. With the continuous growth of the steel industry's demand for high-grade coke, the large-scale development of coke ovens has become the mainstream trend of the industry's development. The 6.73m large ramming coke oven has been widely used in large domestic coking enterprises due to its advantages such as large single-hole coal loading capacity and stable coke quality. This type of coke oven tamps the blended coal into high-density briquettes and then pushes them into the carbonization chamber. Compared with top-loading coke ovens, it can increase the bulk density of the charged coal by 15%-20%, significantly improving the mechanical strength and wear resistance of the coke. It is particularly suitable for the efficient utilization of high-volatile coal and weakly cohesive coal, and is of great significance to optimizing the allocation of coking coal resources.
[0003] However, with the expansion of coke oven capacity and increased production intensity, the technical bottlenecks of the traditional tamping process have become increasingly prominent. Currently, the concept of green and low-carbon development has become a global consensus, placing more stringent energy consumption and environmental protection requirements on the coking industry. Energy consumption per ton of coke is not only a core element of corporate cost control but also a key indicator of technological progress in the industry. Against this backdrop, the two major technical challenges faced by large 6.73m tamping coke ovens in actual production: insufficient coal cake stability and persistently high coal gas consumption, have become core pain points hindering the high-quality development of the industry.
[0004] Existing tamping coke ovens generally utilize a traditional layered tamping process. In the case of a 6.73m tamping coke oven, this traditional layering scheme typically employs fixed-thickness layers or simple linear gradient layers, resulting in significant differences in tamping parameters (bulk density and tamping work) between the bottom and upper layers. For example, the bottom layer of briquettes must withstand the greater weight of the entire briquettes and the mechanical pressure during charging, yet lack the corresponding high bulk density and tamping work. Meanwhile, the upper layer of briquettes experiences significantly less load, yet still maintains high tamping strength, resulting in an irrational "strong at the top, weak at the bottom" load-bearing structure. This design results in a significant disparity in mechanical properties between layers. Based on mechanical principles, during charging, briquettes must withstand the combined forces of the horizontal thrust of the push rods and their own weight. If the bulk density gradient between layers exceeds the appropriate range (ideally, the gradient should be within 5%-8%, but current technology often achieves gradients of 15%-20%), stress concentration areas will form between the layers. At the same time, the traditional layering method adopts a vertical stacking method, which causes stacking defects between layers, resulting in the interlayer bonding force relying only on the mechanical bite force between coal particles, and the bonding strength is low.
[0005] These structural defects result in poor briquette stability, leading to frequent briquette collapse during the loading process. According to field data from a large domestic coking plant, the average briquette collapse rate in a 6.73 m coke oven using traditional tamping procedures was as high as 3.05%. This means that approximately 3 out of every 100 ovens experienced partial or complete briquette collapse. This collapse not only wastes a significant amount of blended coal but also triggers a series of production issues, such as increased equipment wear and tear, decreased production efficiency, and increased quality fluctuations. This is because collapsed briquette can block the gap between the coal loading hole and the oven door, forcing the push rod to push the briquette into the oven door can easily damage the door seal. Resolving a single briquette collapse is time-consuming, and frequent daily collapses can increase equipment downtime, impacting coke oven production. Furthermore, when collapsed briquette is added to the oven, the carbonization chamber is unevenly loaded, with overly dense coal accumulation in certain areas, leading to inconsistent coking times and impacting coking quality.
[0006] Another core flaw of the existing tamping process is its inadequate consideration of the physical laws governing vertical heating of the coal cake. Traditional techniques blindly pursue uniform, high-density tamping throughout the entire layer, specifically maintaining a similar bulk density in the upper layer of coal cake as in the lower layer. This design violates the fundamental principle of vertical heating in the carbonization chamber. During the coking process, heat in the carbonization chamber is primarily conducted through the furnace walls. If the bulk density of the upper layer is too high, a severe thermal resistance layer will form. Field data shows that using traditional tamping procedures, the temperature difference between the upper and lower layers of coal cake can reach 80-100°C. This significant temperature gradient not only prolongs heating time, requiring a longer standard coking time to reach the coking temperature in the upper layer, increasing gas consumption; it also leads to uneven heat distribution. Insufficient heating of the upper layer of coal leads to incomplete volatile release, resulting in a semi-coked structure and reduced coke drum strength. Overheating of the lower layer results in smaller coke lumps and an increased fines content. High gas consumption directly leads to a surge in corporate production costs, and the carbon dioxide emissions generated by the large-scale combustion of gas also increase significantly, which runs counter to the green and low-carbon development concept and restricts the sustainable development of enterprises. Summary of the Invention
[0007] In view of this, the object of the present invention is to provide a large-scale rammed coke oven briquettes and a forming and ramming method thereof, so as to solve the technical problems of poor briquettes stability and high gas consumption caused by the traditional layered ramming method.
[0008] In order to solve the above problems, the present invention provides a large-scale ramming coke oven coal cake forming and ramming method using the following technical solutions: A large-scale ramming coke oven coal cake forming and tamping method is a combination of an arithmetic progression layered tamping method and a gradient tamping method; the arithmetic progression layered tamping method is to start from the upper layer of the coal cake bottom layer to the second top layer, the coal cake height increases layer by layer from bottom to top, the difference in height between any two adjacent coal cake layers is equal, and the wet basis tamping work and coal cake bulk density decrease layer by layer from bottom to top; the gradient tamping method is used on the coal cake top layer, and the wet basis tamping work and tamping density of the coal cake top layer are significantly smaller than the wet basis tamping work and tamping density of the coal cake second top layer.
[0009] Preferably, each layer of the coal cake adopts an overlapping and intersecting design to enhance the bonding force between the layers.
[0010] Furthermore, the overlapping intersection design means that the upper coal layer is actively embedded into the surface of the lower coal layer during tamping, forming an interlayer interface that is interlocked and fused with each other.
[0011] Preferably, the large-scale ramming coke oven coal cake forming and ramming method is applied to a 6.73m large-scale ramming coke oven.
[0012] Preferably, excluding the bottom layer of the coal cake, a total of 13 layers are divided from bottom to top, the 1st to 12th layers are rammed using an arithmetic progression layered tamping method, and the 13th layer is rammed using a gradient tamping method.
[0013] Furthermore, the bottom layer of the coal cake has a height of 0.59 m and a wet base tamping work of 807.83 J / kg, which serves as the basic pressure-bearing layer of the coal cake.
[0014] Furthermore, the heights and wet-base tamping work corresponding to the 1st to 13th layers of coal cakes are as follows: the first layer has a height of 0.20m, a wet-base tamping work of 1464.18J / kg; the second layer has a height of 0.22m, a wet-base tamping work of 1366.57J / kg; the third layer has a height of 0.23m, a wet-base tamping work of 1281.16J / kg; the fourth layer has a height of 0.24m, a wet-base tamping work of 1205.80J / kg; the fifth layer has a height of 0.26m, a wet-base tamping work of 1138.81J / kg; the sixth layer has a height of 0.27m, a wet-base tamping work of 1078.87J / kg ; The height of the 7th layer is 0.29m, and the wet foundation tamping work is 1024.93J / kg; the height of the 8th layer is 0.30m, and the wet foundation tamping work is 976.12J / kg; the height of the 9th layer is 0.32m, and the wet foundation tamping work is 931.75J / kg; the height of the 10th layer is 0.33m, and the wet foundation tamping work is 891.24J / kg; the height of the 11th layer is 0.35m, and the wet foundation tamping work is 854.11J / kg; the height of the 12th layer is 0.36m, and the wet foundation tamping work is 819.94J / kg; the height of the 13th layer is 2.44m, and the wet foundation tamping work is 563.25J / kg.
[0015] Preferably, the moisture content of the blended coal used for the briquettes is 10.5%.
[0016] The technical solution of a large-scale ramming coke oven briquettes provided by the present invention is: A large-scale rammed coke oven briquettes is formed and rammed using the large-scale rammed coke oven briquettes forming and ramming method described in any of the above-mentioned technical solutions, including a bottom layer and multiple briquettes layers located above the bottom layer. In the interval from the first briquettes layer to the second top briquettes layer, the height of the briquettes layers increases layer by layer from bottom to top, the height difference between any two adjacent briquettes layers is a constant value, and the bulk density of the briquettes layers decreases layer by layer from bottom to top; the height of the top briquettes layer is significantly greater than the height of the second top briquettes layer, and the bulk density of the top briquettes layer is significantly less than the bulk density of the second top briquettes layer.
[0017] Furthermore, each coal cake layer adopts an overlapping and intersecting design, and the upper coal cake layer is actively embedded into the surface of the lower coal cake layer during tamping, so as to form an interlayer interface between the two adjacent coal cake layers that is interlocked and intertwined.
[0018] The beneficial effects of the present invention are: The large-scale ramming coke oven coal cake forming and ramming method of the present invention adopts a combination of an arithmetic progression layered ramming method and a gradient ramming method, wherein the arithmetic progression layered ramming method contains an exquisite mechanical design. Starting from the bottom layer, the bulk density and wet-base ramming work of each layer of coal cake decrease layer by layer from bottom to top. The bottom coal bears the weight of the entire coal cake and most of the pressure during the coal loading process, so a higher bulk density and ramming work are required to ensure its solid foundation. As the number of layers increases, the pressure on the coal cake gradually decreases, and the bulk density and ramming work are correspondingly reduced, which not only improves the ramming efficiency, but also forms a natural stress transition structure inside the coal cake. The overlapping and intersecting design between each layer of coal cake greatly enhances the bonding force between layers, just like a solid mortise and tenon structure, so that the coal cake forms a tight whole on the whole, effectively improving the compression and shear resistance of the coal cake, and reducing the possibility of coal cake collapse.
[0019] The core of the gradient tamping method implemented on the top layer is to significantly reduce the tamping work and tamping density. This is not a simple reduction in force, but is based on a deep understanding of the principle of high-dimensional heating of the briquettes. The top layer of the briquettes is more susceptible to heat during the coking process. Excessive tamping density will hinder heat transfer and lead to uneven heating. Through gradient tamping, the bulk density of the top layer of the briquettes is reduced, allowing heat to be conducted more smoothly within the briquettes, thereby improving the uniformity of the high-dimensional heating of the briquettes. Uniform heating not only improves the quality of the coke, but also reduces unnecessary heat consumption, thereby reducing gas consumption.
[0020] The briquettes formed by the above-mentioned tamping method have a high-pressure design on the bottom layer to form a solid foundation to resist the weight of the briquettes and the impact of coal loading. The interlayer overlapping and intersection design greatly improves the interlayer bonding force and shear strength; the tamping work of the briquettes decreases layer by layer from bottom to top to match the pressure gradient of the briquettes, avoiding cracks or deformation caused by local stress concentration, forming a natural stress transfer path, and improving the overall structural toughness of the briquettes, thereby significantly reducing the coal collapse rate during the coking process. The top layer of the briquettes is tamped by gradient, which significantly reduces the stacking density, breaks the "insulating layer effect" of traditional high-density briquettes, achieves uniform heating, reduces ineffective heat loss, saves gas consumption during the coking process, and reduces production costs and carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is the height of each layer of briquettes compacted by the large-scale compacting coke oven briquette forming and compacting method of the present invention and the corresponding wet basis compacting work. DETAILED DESCRIPTION
[0022] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.
[0023] The principles and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.
[0024] Embodiments of the large-scale ramming coke oven coal cake forming and ramming method provided by the present invention: The large-scale ramming coke oven briquettes forming and tamping method of the present invention combines an arithmetic progression layered tamping method with a gradient tamping method. The arithmetic progression layered tamping method starts from the upper layer of the briquettes bottom layer to the second top layer, with the briquettes increasing in height layer by layer from bottom to top, and the height difference between any two adjacent layers of briquettes is equal, and the wet-basis tamping work and briquettes bulk density decrease layer by layer from bottom to top; the gradient tamping method is used on the top layer of briquettes, and its core is to make the wet-basis tamping work and tamping density of the briquettes top layer significantly smaller than the wet-basis tamping work and tamping density of the second top layer of briquettes, so as to optimize the thermal conductivity of the briquettes during the coking process.
[0025] On this basis, an overlapping and intersecting design is adopted between each layer of coal cakes to enhance the bonding strength between layers. The overlapping and intersecting design means that during the layered tamping process, the adjacent coal seams are not completely separated and directly in contact. Instead, the upper coal layer is partially actively pressed into and embedded in the surface of the lower coal layer during tamping, forming an interface structure that interlocks and intertwines. Traditional layered tamping may form a clear interface between layers, like several flat wooden boards stacked together. The "overlapping and intersecting" design allows the upper coal layer to be partially embedded in the lower coal layer ("mortise") like a "tenon" under the action of the tamping hammer.
[0026] When tamping the upper coal layer, the powerful tamping force forces some loose coal particles into tiny pores, depressions, and irregularities in the surface of the relatively dense but not yet fully hardened lower coal layer. The lower coal layer's surface is not perfectly flat, but rather contains microscopic irregularities. Under high pressure, the upper coal layer fills these irregularities, creating an interlocking pattern of interlayers. This physical interlocking and interlocking creates a greater resistance to separation. Compared to the contact between two smooth surfaces, the interlocking interface has a much larger actual contact area. This greater contact area means greater static and sliding friction, further inhibiting relative motion between the layers. The layers are no longer simply stacked, but rather mechanically interlocked. This is similar to the mortise and tenon joint structure in carpentry or the interlocking faults in geology, effectively resisting interlayer shear forces. Through this interlocking, the previously independent layers are "woven" into a more compact, continuous coal cake, significantly enhancing the overall structural strength and stability of the coal cake. The interlocking structure ensures more uniform and continuous stress transfer within the briquette (especially in the vertical direction), avoiding stress concentration points at distinct interlayer interfaces, thereby improving the briquette's compressive and shear resistance. When the briquette is moved (e.g., pushed into the carbonization chamber) or subjected to external forces (e.g., thrust from a loading truck or its own weight), this interlocking structure effectively prevents relative sliding or misalignment between adjacent coal layers, thereby improving the briquette's overall stability.
[0027] The top layer of the briquette significantly reduces the wet-base tamping work and tamping density, making the top layer looser and breaking the thermal barrier effect. The lower bulk density increases the briquette's porosity, thereby expanding the raw gas flow channel and improving thermal conductivity. Heat more easily penetrates the low-density top layer, accelerating the heating of the middle and lower layers of coal, resulting in a more uniform coke maturity. Gradient tamping reduces the density of the upper layer of briquette, allowing heat to be conducted more smoothly throughout the briquette, thereby improving the uniformity of the briquette's vertical heating. Uniform heating not only improves the quality of the coke but also reduces unnecessary heat consumption, thereby reducing gas consumption.
[0028] In practical application, the large-scale ramming coke oven briquette forming and ramming method of the present invention can be applied to a 6.73 m large-scale ramming coke oven.
[0029] Except for the bottom layer, the coal cakes are divided into 13 layers from bottom to top in the vertical direction. Figure 1As shown in the figure, the bottom layer of the coal cake is 0.59m high and has a wet-base tamping work of 807.83J / kg, which serves as the basic pressure-bearing layer of the coal cake. The heights and wet-base tamping work corresponding to the 1st to 13th layers of the coal cake are as follows: the first layer has a height of 0.20m, a wet-base tamping work of 1464.18J / kg; the second layer has a height of 0.22m, a wet-base tamping work of 1366.57J / kg; the third layer has a height of 0.23m, a wet-base tamping work of 1281.16J / kg; the fourth layer has a height of 0.24m, a wet-base tamping work of 1205.80J / kg; the fifth layer has a height of 0.26m, a wet-base tamping work of 1138.81J / kg; the sixth layer has a height of 0.27m, a wet-base tamping work of 1078.87J / kg; the seventh layer has a height of 0.28m, a wet-base tamping work of 1177.81J / kg; the eighth layer has a height of 0.26m, a wet-base tamping work of 1166.81J / kg; the eighth layer has a height of 0.28m, a wet-base tamping work of 1154.81J / kg; the eighth layer has a height of 0.28m, a wet-base tamping work of 1166.81J / kg; the eighth layer has a height of 0.28m, a wet-base tamping work of 1177.81J / kg; the eighth layer has a height of 0.28m, a wet-base tamping work of 1166.81J / kg; the The layer height is 0.29m, the wet foundation tamping work is 1024.93J / kg; the 8th layer height is 0.30m, the wet foundation tamping work is 976.12J / kg; the 9th layer height is 0.32m, the wet foundation tamping work is 931.75J / kg; the 10th layer height is 0.33m, the wet foundation tamping work is 891.24J / kg; the 11th layer height is 0.35m, the wet foundation tamping work is 854.11J / kg; the 12th layer height is 0.36m, the wet foundation tamping work is 819.94J / kg; the 13th layer height is 2.44m, the wet foundation tamping work is 563.25J / kg.
[0030] It can be seen from the above data that the height difference between any two adjacent layers of coal cakes ranges from 0.01m to 0.02m. However, it should be noted that in actual tamping, the height difference between any two adjacent layers of coal cakes is a certain value, and this constant value is within the above range. The above data is rounded to two decimal places, and there will be certain differences compared with the actual data.
[0031] The bottom layer achieves a tamping power of 807.83 J / kg. This high tamping power reduces the porosity between coal particles compared to conventional processes, forming a dense support structure and addressing the problem of insufficient support in the bottom layer. Layers 1 through 12 utilize an arithmetic progression layered tamping method to increase the compressive and shear resistance of the coal briquettes. Layer 13 utilizes a gradient tamping method, significantly reducing the wet-base tamping power and tamping density compared to the 12th layer. This prevents the formation of an "overheated layer," improves high-level heating uniformity, reduces ineffective heating, and lowers gas consumption.
[0032] The moisture content of the combined coal was successfully reduced from 11.5% to 10.5%. This appropriate amount of moisture forms a water film on the surface of the coal particles, reducing friction and reducing the sliding resistance of the coal particles by 10% during tamping. This facilitates the formation of a dense structure, facilitating briquette formation. It also improves the internal physical structure of the briquette, enhancing its stability. The coal collapse rate has been significantly reduced from 3.05% to 0.2%. This significant improvement means that the risk of production interruptions is greatly reduced and production efficiency is greatly improved. More importantly, the gas consumption per ton of coking coal has been significantly reduced. While ensuring coke quality, by improving the uniformity of high-pressure heating of the briquette, the energy utilization efficiency of the coking process is optimized and gas consumption is effectively controlled. This not only saves the company significant energy costs but also reduces greenhouse gas emissions, taking a solid step towards achieving green coking production.
[0033] It should be noted that the number of briquette layers is not limited to the aforementioned 13 layers, nor is the height of each layer limited to the aforementioned data. During actual coking, the briquette layers can be appropriately layered according to specific needs, and an appropriate wet-basis tamping work can be selected for each layer. Of course, the large-scale tamping coke oven briquette forming and tamping method of the present invention can also be used in tamping coke ovens with carbonization chamber heights of 6.25 m, 6.8 m, or higher.
[0034] In addition, the tamping density and bulk density in this embodiment are two different concepts. Tamping density refers to the unit volume mass of the coal cake formed by the mixed coal (including moisture) under the action of a tamping machine (such as a tamping hammer), reflecting the degree of compaction of the coal particles under the action of mechanical force. Its physical meaning is: through external work (tamping work), the friction and intermolecular forces between coal particles are overcome, the coal particles are rearranged and the porosity is reduced, forming a dense structure with a specific strength. Bulk density is the unit volume mass of the mixed coal when it is naturally stacked, reflecting the looseness of the coal particles in the naturally stacked state.
[0035] The large-scale ramming coke oven coal cake forming and ramming method of the present invention is controlled by vertical zoning, uses arithmetic progression layering to solve the problem of mechanical instability of the lower layer, and uses gradient cliff density reduction to solve the bottleneck of heat conduction in the upper layer, supplemented by precise control of moisture, to achieve coordinated optimization in the two dimensions of physical structure (anti-collapse) and thermodynamic process (energy consumption reduction), ultimately achieving both high stability of coal cakes and low consumption of coal gas.
[0036] The embodiment of the large-scale ramming coke oven briquettes provided by the present invention: The large-scale rammed coke oven briquettes are produced using the large-scale rammed coke oven briquette forming and tamping method described in the above-described embodiment. The large-scale rammed coke oven briquettes in this embodiment differ from briquettes formed by conventional layered and uniform tamping. Specifically, they include a bottom layer and multiple briquette layers located above the bottom layer. The bottom layer utilizes a high-pressure-bearing design to form a solid foundation that resists the weight of the briquettes and the impact of coal loading. From the first briquette layer to the second-top briquette layer, the briquette layer height increases layer by layer from bottom to top, with the height difference between any two adjacent briquette layers being a constant. The briquette layer bulk density decreases layer by layer from bottom to top, and the actual wet-basis tamping work also decreases layer by layer from bottom to top. The height of the top briquette layer is significantly greater than that of the second-top briquette layer, and the bulk density of the top briquette layer is significantly less than that of the second-top briquette layer, resulting in an actual wet-basis tamping work and tamping density that are significantly less than those of the second-top briquette layer.
[0037] In addition, each layer of coal cake adopts an overlapping and intersecting design, that is, the upper coal cake layer is actively embedded into the surface of the lower coal cake layer during tamping, so as to form an interlayer interface between the two adjacent coal cake layers that is interlocked and intertwined.
[0038] When the large-scale ramming coke oven coal cake of the present invention is used for coking, the overall stability of the coal cake is high and the coal collapse rate is low; the temperature field distribution of the overall coal cake in the vertical direction is made uniform by the structure of dense bottom and sparse top, the heating is more uniform, the difference in coke maturity is significantly reduced, the consumption of coke gas per ton is significantly reduced, and the coking cycle is shortened; the coal gas utilization rate is improved, and the production of the same amount of coke can reduce carbon dioxide emissions.
[0039] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0040] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will readily appreciate that various modifications, readjustments, and substitutions are possible without departing from the scope of the present invention. It is not necessary and impossible to provide an exhaustive list of all embodiments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be encompassed by the scope of the claims.
Claims
1. A large-scale ramming coke oven briquettes forming and ramming method, characterized in that: It combines the arithmetic progression layered tamping method with the gradient tamping method; the arithmetic progression layered tamping method starts from the upper layer of the coal cake bottom layer to the second top layer, and the height of the coal cake increases layer by layer from bottom to top. The difference in height between any two adjacent layers of coal cake is equal, and the wet basis tamping work and coal cake bulk density decrease layer by layer from bottom to top; the gradient tamping method is used on the top layer of coal cake, and makes the wet basis tamping work and tamping density of the top layer of coal cake significantly smaller than the wet basis tamping work and tamping density of the second top layer of coal cake.
2. A large-scale ramming coke oven briquettes forming and ramming method according to claim 1, characterized in that: Each layer of coal cakes adopts an overlapping and intersecting design to enhance the bonding strength between layers.
3. A large-scale ramming coke oven briquettes forming and ramming method according to claim 2, characterized in that: The overlapping intersection design means that the upper coal layer is actively embedded into the surface of the lower coal layer during tamping, forming an interlayer interface that is interlocked and fused with each other.
4. A large-scale ramming coke oven briquettes forming and ramming method according to claim 1, characterized in that: This method is applied to a 6.73m large ramming coke oven.
5. A large-scale ramming coke oven briquettes forming and ramming method according to any one of claims 1 to 4, characterized in that: Except for the bottom layer of coal cakes, there are 13 layers from bottom to top. The 1st to 12th layers are compacted by arithmetic progression, and the 13th layer is compacted by gradient.
6. A large-scale ramming coke oven briquettes forming and ramming method according to claim 5, characterized in that: The bottom layer height of the coal cake is 0.59m, and the wet base tamping work is 807.83J / kg, which serves as the basic pressure-bearing layer of the coal cake.
7. A large-scale ramming coke oven briquettes forming and ramming method according to claim 6, characterized in that: The heights and wet-base tamping work corresponding to the 1st to 13th layers of coal cakes are as follows: the first layer has a height of 0.20m, and the wet-base tamping work is 1464.18 J / kg; the second layer has a height of 0.22m, and the wet-base tamping work is 1366.57 J / kg; the third layer has a height of 0.23m, and the wet-base tamping work is 1281.16 J / kg; the fourth layer has a height of 0.24m, and the wet-base tamping work is 1205.80 J / kg; the fifth layer has a height of 0.26m, and the wet-base tamping work is 1138.81 J / kg; the sixth layer has a height of 0.27m, and the wet-base tamping work is 1078.87 J / kg; the seventh layer has a height of 0.28m, and the wet-base tamping work is 1177.81 J / kg; the eighth layer has a height of 0.26m, and the wet-base tamping work is 1166.81 J / kg. The layer height is 0.29m, the wet foundation tamping work is 1024.93J / kg; the 8th layer height is 0.30m, the wet foundation tamping work is 976.12J / kg; the 9th layer height is 0.32m, the wet foundation tamping work is 931.75J / kg; the 10th layer height is 0.33m, the wet foundation tamping work is 891.24J / kg; the 11th layer height is 0.35m, the wet foundation tamping work is 854.11J / kg; the 12th layer height is 0.36m, the wet foundation tamping work is 819.94J / kg; the 13th layer height is 2.44m, the wet foundation tamping work is 563.25J / kg.
8. A large-scale ramming coke oven briquettes forming and ramming method according to any one of claims 1 to 4, characterized in that: The moisture content of the blended coal used in the briquettes is 10.5%.
9. A large ramming coke oven briquettes, characterized in that: A large-scale ramming coke oven coal cake forming and ramming method according to any one of claims 1 to 8 is adopted, comprising a bottom layer and multiple coal cake layers located above the bottom layer, wherein in the interval from the first coal cake layer to the second top coal cake layer, the height of the coal cake layer increases layer by layer from bottom to top, the height difference between any two adjacent coal cake layers is a constant value, and the bulk density of the coal cake layer decreases layer by layer from bottom to top; the height of the top coal cake layer is significantly greater than the height of the second top coal cake layer, and the bulk density of the top coal cake layer is significantly less than the bulk density of the second top coal cake layer.
10. The large-scale rammed coke oven briquettes according to claim 9, characterized in that: Each layer of coal cakes adopts an overlapping and intersecting design. The upper coal cake layer is actively embedded into the surface of the lower coal cake layer during tamping, so as to form an interlayer interface between the two adjacent coal cake layers that is interlocked and fused.