Retaining wall structure of dry quenching primary dust remover

Abstract

The utility model provides a retaining wall structure of a dry quenching primary dust remover, which belongs to the technical field of primary dust removers and comprises a lower retaining wall, an upper retaining wall and ventilation holes, the upper retaining wall is positioned above the lower retaining wall and is formed by building bricks, and the ventilation holes are communicated with the lower retaining wall. Ventilation holes are respectively formed among the upper retaining wall, the lower retaining wall and the inner wall of the vault of the primary dust remover, and the primary dust remover is arranged between the dry quenching furnace and the dry quenching waste heat boiler. The ventilation holes are formed between the lower retaining wall and the inner wall of the primary dust remover, so that the distribution of a flow field in the primary dust remover is optimized, and the flow speed and resistance of airflow in front of and behind the lower retaining wall are reduced, thereby reducing the phenomenon of secondary raising of coke powder, improving the dust removal efficiency and reducing the production cost. And the phenomenon of boiler tube explosion caused by direct scouring of the high-speed rising air flow to the boiler hanging tube is avoided.

Description

Technical Field

[0001] This utility model belongs to the technical field of primary dust collectors, specifically relating to a retaining wall structure for a dry quenching coke primary dust collector. Background Technology

[0002] Coke is an important raw material and fuel in the iron and steel metallurgical industry. Dry quenching is an industrial device that uses low-temperature inert gas to cool red-hot coke. The primary dust collector for dry quenching is a dust removal device located between the dry quenching furnace and the dry quenching waste heat boiler. It uses gravity dust removal and inertial dust removal principles to settle out larger coke particles, so as to ensure that the dust concentration and particle size of the flue gas entering the dry quenching waste heat boiler meet the boiler requirements.

[0003] In the existing technology, the primary dust collector with a baffle structure is an inertial dust collector device. By setting up the baffle structure, the dust-laden gas is forced to change its flow direction, so that the coke powder with a density greater than that of the circulating gas will collide with the baffle wall or the wall of the dust collector hopper under the action of inertia. When the coke powder loses its kinetic energy, it is separated from the entrainment of the circulating gas and is finally collected by the hopper.

[0004] However, the existing baffle structure causes the local flow velocity of the turning airflow to be relatively high, creating vortex regions and a relatively turbulent flow field. This leads to the secondary lifting of coke dust, affecting the dust removal efficiency. Furthermore, the high-speed airflow carrying dust can easily directly scour the boiler hanging tubes, potentially causing boiler tube rupture. Utility Model Content

[0005] Based on the above-mentioned technical problems, this utility model provides a baffle wall structure for a primary dust collector in dry quenching coke. By providing ventilation holes between the lower baffle wall and the inner wall of the primary dust collector, the distribution of the flow field inside the primary dust collector is optimized, the flow velocity and resistance of the airflow before and after the lower baffle wall are reduced, thereby reducing the phenomenon of secondary coke dust being lifted, improving dust removal efficiency, and avoiding the phenomenon of boiler tube rupture caused by the high-speed rising airflow directly scouring the boiler hanging tubes.

[0006] The specific technical solution is as follows:

[0007] A baffle structure for a primary dust collector in dry quenching coke is provided. The baffle structure is vertically installed inside the primary dust collector and includes: a lower baffle wall, an upper baffle wall, and ventilation holes. The upper baffle wall is located above the lower baffle wall and is constructed of bricks, forming ventilation holes between the upper baffle wall, the lower baffle wall, and the inner wall of the arch of the primary dust collector. The primary dust collector is located between the dry quenching furnace and the dry quenching coke waste heat boiler.

[0008] In addition, the dry quenching primary dust collector retaining wall structure provided by this utility model may also have the following additional technical features:

[0009] In the above technical solution, the lower retaining wall is constructed of bricks.

[0010] In the above technical solution, the ventilation hole is crescent-shaped, formed by arched masonry.

[0011] In the above technical solution, the cross-section of the ventilation hole is trapezoidal, and the side of the ventilation hole opposite to the flue gas inlet of the primary dust collector has a small diameter opening, while the side opposite to the flue gas outlet of the primary dust collector has a large diameter opening.

[0012] In the above technical solution, the top and bottom surfaces of the lower retaining wall are constructed with an arched structure, and the middle part is filled with standard bricks; the upper retaining wall is constructed with an arched structure.

[0013] In the above technical solution, the thickness of both the lower retaining wall and the upper retaining wall is 200-500mm.

[0014] In the above technical solution, grooves are provided on the left and right sides of the brick.

[0015] The baffle wall structure of the dry quenching coke primary dust collector of this utility model has the following advantages compared with the prior art:

[0016] 1. By setting ventilation holes formed by the upper baffle wall between the lower baffle wall and the inner wall of the primary dust collector arch, some flue gas can flow directly through the ventilation holes to the flue gas outlet without having to turn through the lower baffle wall. This reduces the flow velocity of the turning airflow, makes the entire flow field smoother, and thus reduces the phenomenon of secondary agitation of small coke particles, thereby improving the dust removal efficiency of the primary dust collector.

[0017] 2. By allowing some small coke particles with low dust content to pass directly through the holes, while larger dust particles move under gravity and collide with the lower baffle wall to settle down, the upper and lower airflows merge and change the gas flow direction. This avoids dust directly scouring the boiler hanging pipes, reduces the risk of equipment damage due to wear, and extends the service life of the equipment.

[0018] 3. By setting ventilation holes to optimize airflow distribution, the resistance of the dry quenching system can be reduced to a certain extent, thereby enhancing the stability of the retaining wall structure, reducing damage caused by airflow impact, and extending the service life of the primary dust collector.

[0019] 4. By using wedge-shaped bricks with grooves to construct the retaining wall in an arched structure, the stability of the structure is ensured and the bricks are less likely to fall off.

[0020] 5. By setting the cross-section of the ventilation holes to be trapezoidal, with a small-diameter opening on the side near the flue gas inlet, the local resistance is increased and the flow rate is controlled, while the large-diameter opening on the side near the flue gas outlet reduces the flow velocity behind the baffle structure, thereby smoothing the flow field. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a retaining wall structure for a primary dust collector in dry quenching coke oven according to Embodiment 1 of this utility model.

[0022] Figure 2 for Figure 1 A magnified view of section B;

[0023] Figure 3 This is another structural schematic diagram of the retaining wall structure of a primary dust collector for dry quenching coke; Embodiment 1 of this utility model.

[0024] Figure 4 This is a structural schematic diagram of Embodiment 2 of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of Embodiment 3 of this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of Embodiment 4 of this utility model;

[0027] in, Figures 1 to 6 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0028] 10 Primary dust collector, 11 Lower retaining wall, 12 Upper retaining wall, 13 Ventilation hole, 14 Groove tongue, 15 Vertical hole, 16 Square hole, 17 Conical hole, 18 Flue gas inlet, 19 Flue gas outlet, A Hole area. Detailed Implementation

[0029] The following are specific implementation cases and appendices. Figure 1-6 The present invention will be further described below, but the present invention is not limited to these embodiments.

[0030] Example 1:

[0031] A baffle structure for a primary dust collector in dry quenching coke oven, such as Figure 1-3 As shown, the baffle structure is vertically installed inside the primary dust collector 10, including: a lower baffle 11, an upper baffle 12, and a ventilation hole 13. The upper baffle 12 is located above the lower baffle 11 and is constructed of bricks, so that a ventilation hole 13 is formed between the upper baffle 12, the lower baffle 11, and the inner wall of the arch of the primary dust collector 10. The primary dust collector 10 is located between the dry quenching furnace and the dry quenching coke waste heat boiler.

[0032] By employing the above structure, a ventilation hole 13, constructed from the upper baffle wall 12, is provided between the lower baffle wall 11 and the inner wall of the arch of the primary dust collector 10. This allows a portion of the flue gas to flow directly through the ventilation hole 13 to the flue gas outlet 19 without having to deflect through the lower baffle wall 11. This reduces the velocity of the deflecting airflow, making the entire flow field smoother and thus reducing the secondary agitation of small coke particles, thereby improving the dust removal efficiency of the primary dust collector 10. By allowing some small coke particles with lower dust content to pass directly through the hole, larger dust particles move under gravity and collide with the lower baffle wall 11 to settle. This causes the upper and lower airflows to merge and change the gas flow direction, thereby preventing dust from directly scouring the boiler hanging pipes, reducing the risk of equipment damage due to wear, and extending the service life of the equipment.

[0033] Specifically, by setting ventilation holes 13 to optimize the airflow distribution, the resistance of the dry quenching system can be reduced to a certain extent, thereby enhancing the stability of the retaining wall structure, reducing damage caused by airflow impact, and thus extending the service life of the primary dust collector 10.

[0034] In this embodiment of the invention, the high-temperature inert gas with a certain flow rate coming out of the annular air duct of the dry quenching furnace, before flowing through the lower baffle wall 11, is mostly composed of small coke particles and has almost no large dust particles under the action of gravity dust removal. This airflow enters the dry quenching coke waste heat boiler directly through the ventilation hole 13. The lower airflow is mostly composed of large coke particles. When passing through the lower baffle wall 11, the dust-laden gas is forced to change its flow direction. The coke particles with a density greater than that of the circulating gas collide with the lower baffle wall 11 under the action of inertial dust removal. After losing kinetic energy, they are separated from the circulating gas and are finally collected by the ash hopper at the bottom of the primary dust collector 10.

[0035] Specifically, by setting vent holes 13, the high-temperature inert gas from the annular air duct of the dry quenching furnace is distributed. The upper airflow, with its lower dust content, passes directly through the vent holes 13 under gravity settling, no longer participating in the backflow below the lower baffle wall 11. This reduces the amount of flue gas backflowing before and after the lower baffle wall 11, making the flow field before and after the baffle wall structure more stable, thus reducing the secondary agitation of small particles. Furthermore, the upper and lower airflows converge behind the lower baffle wall 11, making the airflow direction perpendicular to the waste heat boiler, avoiding direct impact of the settled gas on the boiler's top hanging pipes, reducing the resistance of the dry quenching system, enhancing the stability of the baffle wall structure, and thus extending the service life of the primary dust collector 10.

[0036] In an embodiment of this utility model, the lower retaining wall 11 is constructed of bricks.

[0037] In an embodiment of this utility model, the ventilation hole 13 is crescent-shaped, formed by arched masonry.

[0038] By using wedge-shaped bricks with grooves to construct the retaining wall in an arched structure, the stability of the structure is ensured and the bricks are less likely to fall off.

[0039] In an embodiment of this utility model, the cross-section of the ventilation hole 13 is trapezoidal, and the side of the ventilation hole 13 opposite to the flue gas inlet of the primary dust collector 10 has a small diameter opening, while the side opposite to the flue gas outlet 19 of the primary dust collector 10 has a large diameter opening.

[0040] By setting the cross-section of the ventilation hole 13 to be trapezoidal, with a small-diameter opening on the side near the flue gas inlet, the local resistance is increased and the flow rate is controlled. On the other hand, the large-diameter opening on the side near the flue gas outlet 19 reduces the flow velocity behind the baffle structure, thereby smoothing the flow field.

[0041] In an embodiment of this utility model, the top and bottom surfaces of the lower retaining wall are constructed with an arched structure, and the middle part is filled with standard bricks; the upper retaining wall is constructed with an arched structure.

[0042] The stability of the retaining wall structure is ensured by constructing the bottom of the lower retaining wall using an arched structure.

[0043] In the embodiments of this utility model, the thickness of both the lower retaining wall 11 and the upper retaining wall 12 is 200-500mm.

[0044] In an embodiment of this utility model, grooves 14 are provided on the left and right sides of the brick.

[0045] By providing tongues 14 on the left and right sides of the bricks, the bricks can be locked in place during construction, thus ensuring the stability of the structure and preventing them from falling off.

[0046] Example 2:

[0047] In embodiments of this utility model, such as Figure 4 As shown, the ventilation hole 13 above the lower retaining wall 11 can be constructed into a vertical hole 15 by the upper retaining wall 12, and the cross section of the vertical hole 15 is trapezoidal.

[0048] Example 3:

[0049] In embodiments of this utility model, such as Figure 5 As shown, the ventilation hole 13 above the lower retaining wall 11 can also be constructed into a square hole 16 by the upper retaining wall 12, and the cross section of the square hole 16 is trapezoidal.

[0050] Example 4:

[0051] In embodiments of this utility model, such as Figure 6As shown, the ventilation hole 13 above the lower retaining wall 11 can also be constructed into a conical hole 17 by the upper retaining wall 12, and the cross section of the conical hole 17 is trapezoidal.

[0052] Example 5:

[0053] In the embodiments of this utility model, based on embodiments 1-4, the specific dimensions of the ventilation holes are as follows:

[0054]

[0055] Where H is the height of the opening area; u t denoted as ρ, where ρ is the settling velocity of the critical diameter dust particles; u is the inlet velocity of the primary dust collector; and l is the length from the retaining wall surface to the inlet of the primary dust collector.

[0056]

[0057] A represents the area of ​​the opening; H represents the height of the opening; b represents the width of the opening. This is the flow allocation coefficient.

[0058] In the description of this utility model, the term "multiple" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0059] In the description of this utility model, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this utility model, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A baffle structure for a primary dust collector in dry quenching coke ovens, wherein the baffle structure is vertically installed inside the primary dust collector, characterized in that, It includes: a lower baffle wall, an upper baffle wall, and ventilation holes. The upper baffle wall is located above the lower baffle wall and is constructed of bricks, forming ventilation holes between the upper baffle wall, the lower baffle wall, and the inner wall of the primary dust collector arch. The primary dust collector is located between the dry quenching furnace and the dry quenching coke waste heat boiler.

2. The retaining wall structure of a primary dust collector for dry quenching coke as described in claim 1, characterized in that, The lower retaining wall is constructed of bricks.

3. The retaining wall structure of a primary dust collector for dry quenching coke ovens according to claim 2, characterized in that, The ventilation hole is crescent-shaped, formed by arched masonry.

4. The retaining wall structure of a primary dust collector for dry quenching coke ovens according to claim 3, characterized in that, The cross-section of the ventilation hole is trapezoidal, and the side of the ventilation hole opposite to the flue gas inlet of the primary dust collector has a small diameter opening, while the side opposite to the flue gas outlet of the primary dust collector has a large diameter opening.

5. The retaining wall structure of a primary dust collector for dry quenching coke ovens according to claim 4, characterized in that, The top and bottom surfaces of the lower retaining wall are constructed with an arched structure, and the middle part is filled with standard bricks; the upper retaining wall is constructed with an arched structure.

6. The retaining wall structure of a primary dust collector for dry quenching coke ovens according to claim 5, characterized in that, The thickness of both the lower and upper retaining walls is 200-500mm.

7. The retaining wall structure of a primary dust collector for dry quenching coke ovens according to claim 6, characterized in that, The brick has grooves on both the left and right sides.

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