Dry quenching inclined air duct partition wall

Abstract

The utility model belongs to the technical field of dry quenching furnace structures, and particularly provides a dry quenching inclined air duct partition wall which comprises a first brick body and a second brick body, the first brick body and the second brick body are both hexahedrons, and the first brick body and the second brick body are fixedly connected in a masonry mode. According to the dry quenching ventilation method, a dry quenching inclined air duct partition wall is applied; the dry quenching furnace body comprises a cooling area, a chute area, an annular air duct and a pre-storage area, the chute area is positioned below the annular air duct, and a plurality of inclined air duct partition walls which are annularly distributed divide the chute area into a plurality of inclined air ducts; for analysis of a single air duct opening, the inclined air duct and the annular air duct form an asymmetric three-way model. The resistance in the dry quenching furnace system is related to the energy consumption of the circulating fan, the negative pressure at the inlet of the boiler and the airflow resistance are reduced, the load of the circulating fan is reduced, the power consumption of the fan is reduced, the operation cost is reduced, the equipment wear is slowed down, and the energy is saved by 0.5% from the energy consumption of the fan.

Description

Technical Field

[0001] This utility model belongs to the technical field of dry quenching furnace structure, and specifically provides a partition wall for the inclined air duct of dry quenching coke. Background Technology

[0002] Dry quenching, as opposed to wet quenching, refers to a quenching process that uses inert gas to cool red-hot coke. A dry quenching furnace typically includes a cooling zone, an inclined chute zone, an annular air duct zone, and a pre-storage zone. The coke flows upwards, while the inert gas flows upwards, undergoing a counter-current heat exchange. After heat exchange, the inert gas reaches temperatures as high as 900°C and accumulates within the annular air duct.

[0003] The air duct partitions of dry quenching furnaces currently in use on the market are vertical, meaning that the airflow converges into the annular air duct at a 90-degree angle. This results in significant airflow pressure loss, which is detrimental to flow field stability and can easily lead to coke floating accidents. Utility Model Content

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a dry quenching coke inclined air duct partition wall includes a first brick body and a second brick body, both of which are hexahedrons, and the first brick body and the second brick body are fixedly connected by masonry.

[0005] The first brick is shaped like a fan-shaped hexahedron with oblique cuts. The upper and lower surfaces of the first brick are staggered. The second brick is also shaped like a fan-shaped hexahedron with oblique cuts. The second brick can be spliced ​​with the first brick to form a continuous oblique wall.

[0006] Furthermore, the six faces of the first brick are the bottom face of the first brick, the top face of the first brick, two inclined sidewalls of the first brick, and two arc-shaped sidewalls of the first brick. The bottom face and the top face of the first brick are fan-shaped and are offset from left to right based on the top view. The arc-shaped sidewalls of the first brick are arc-shaped and the two arc-shaped sidewalls are concentric arcs. A cross flange is provided on the top face of the first brick.

[0007] Furthermore, the six faces of the second brick are the bottom face, the top face, two inclined sidewalls, and two curved sidewalls. The bottom face and the top face are fan-shaped and offset to the left and right from a top-down perspective. The curved sidewalls are curved and the two curved sidewalls are concentric arcs. A cross groove is provided on the bottom face of the second brick.

[0008] Furthermore, the inclination angle of the inclined air duct partition wall is the ingress angle α, and the ingress angle α is less than or equal to 45 degrees.

[0009] The beneficial effects of using this utility model are:

[0010] The resistance within the dry quenching furnace system is related to the energy consumption of the circulating fan. The magnitude of the negative pressure at the boiler inlet reduces the airflow resistance, thereby reducing the load on the circulating fan, decreasing fan power consumption, lowering operating costs, and slowing down equipment wear. From the perspective of fan energy consumption alone, this results in an energy saving of 0.5%.

[0011] Reducing resistance helps prevent cold air from diluting the circulating gas and maintains the heat exchange efficiency inside the boiler; it also reduces combustion fluctuations or uneven coke cooling caused by air leakage. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of the inclined air duct partition wall of this utility model;

[0013] Figure 2 This is a structural schematic diagram of the first brick of the inclined air duct partition wall of this utility model;

[0014] Figure 3 This is a top view of the first brick of the inclined air duct partition wall of this utility model;

[0015] Figure 4 This is a bottom view of the first brick of the inclined air duct partition wall of this utility model;

[0016] Figure 5 This is a structural schematic diagram of the second brick of the inclined air duct partition wall of this utility model;

[0017] Figure 6 This is a top view of the second brick of the inclined air duct partition wall of this utility model;

[0018] Figure 7 This is a bottom view of the second brick of the inclined air duct partition wall of this utility model;

[0019] Figure 8 This is a schematic diagram of the angle at which the inclined air duct partition wall of this utility model converges;

[0020] Figure 9 This is a schematic diagram of the furnace body structure of the upper part of the dry quenching coke according to this utility model.

[0021] Figure 10 This is a schematic diagram of the furnace structure and airflow trajectory of the upper part of the dry quenching coke of this utility model.

[0022] Figure 11 These are comparison images showing the improved effect of the inclined air duct partition wall of this utility model;

[0023] Figure 12 Comparison diagrams showing the effects of existing inclined air duct partition walls before and after improvement;

[0024] Figure 13 This is a schematic diagram showing the numbering of the air duct opening of this utility model;

[0025] Figure 14 This is a schematic diagram illustrating the adjustment of the brick distribution method according to this utility model.

[0026] The reference numerals in the figures include:

[0027] 1. The first brick body;

[0028] 101. Bottom surface of the first brick; 102. Top surface of the first brick; 103. Cross flange; 104. Inclined side wall of the first brick; 105. Arc-shaped side wall of the first brick;

[0029] 2. The second brick body;

[0030] 201. Bottom surface of the second brick; 202. Top surface of the second brick; 203. Cross-shaped groove; 204. Inclined side wall of the second brick; 205. Arc-shaped side wall of the second brick;

[0031] 3. Inclined duct area; 4. Circular air duct; 5. Clockwise wall; 6. Counterclockwise wall; 7. Vertical retaining wall; 8. Exhaust vent; 9. Adjusting bricks. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings.

[0033] Reference Figures 1-7 A dry quenching coke inclined air duct partition wall includes a first brick body 1 and a second brick body 2. Both the first brick body 1 and the second brick body 2 are hexahedrons. The first brick body 1 and the second brick body 2 are fixedly connected by masonry.

[0034] The first brick 1 is shaped like a fan-shaped hexahedron with oblique cuts. The upper and lower surfaces of the first brick 1 are staggered. The second brick 2 is also shaped like a fan-shaped hexahedron with oblique cuts. The second brick 2 can be spliced ​​with the first brick 1 to form a continuous oblique wall.

[0035] Preferably, the six faces of the first brick 1 are the bottom face 101, the top face 102, the two inclined sidewalls 104, and the two arc-shaped sidewalls 105. The bottom face 101 and the top face 102 are fan-shaped and are offset from left to right with a top view. The arc-shaped sidewalls 105 are arc-shaped and the two arc-shaped sidewalls 105 are concentric arcs. A cross flange 103 is provided on the top face 102 of the first brick.

[0036] Preferably, the six faces of the second brick 2 are the bottom surface 201, the top surface 202, the two inclined sidewalls 204, and the two arc-shaped sidewalls 205. The bottom surface 201 and the top surface 202 are fan-shaped, and the bottom surface 201 and the top surface 202 are offset from left to right with a top-down view as a reference. The arc-shaped sidewalls 205 are arc-shaped, and the two arc-shaped sidewalls 205 are concentric arcs. A cross groove 203 is provided on the bottom surface 201 of the second brick.

[0037] The angle of inclination of the inclined air duct partition wall is the inflow angle α;

[0038] Preferably, the angle of convergence α is less than or equal to 45 degrees.

[0039] Reference Figures 8-12 A dry quenching ventilation method is described, which uses a dry quenching inclined air duct partition wall. The dry quenching furnace body includes a cooling zone, an inclined duct zone 3, an annular air duct 4 and a pre-storage zone. The inclined duct zone 3 is located below the annular air duct 4. Multiple inclined air duct partition walls distributed in a ring divide the inclined duct zone 3 into multiple inclined air ducts.

[0040] Analyzing a single air duct opening, the inclined air duct and the annular air duct form an asymmetric three-way model;

[0041] Several adjustment bricks are installed at each air duct opening.

[0042] Specifically, the inner cavity of the inclined section 3 is provided with a vertical baffle 7 and an exhaust port 8, and the exhaust port 8 is located opposite the vertical baffle 7. That is, the annular space of the inclined section 3 is divided into two semi-annular inclined sections. The inclined air duct partitions in the two semi-annular inclined sections are clockwise wall 5 and counterclockwise wall 6, respectively. The inclined air duct partitions cooperate with the brackets to divide the two semi-annular inclined sections into multiple inclined air ducts. The circulating gas flows out from the air duct opening of the inclined air duct from bottom to top and converges obliquely into the annular air duct 4.

[0043] As airflow accumulates from each duct opening, the amount of airflow gathered in the annular duct 4 increases. Therefore, the dynamic pressure of the airflow at the vertical baffle 7 is the lowest, while the dynamic pressure of the airflow at the exhaust vent 8 is the highest.

[0044] Based on the sequence from the vertical retaining wall 7 to the exhaust vent 8, the number of adjusting bricks 9 at the air duct opening increases incrementally.

[0045] Furthermore, let the gas flow rate Q (Nm³) 3 / h), circulation area F(m 2 ), the angle of entry α (°);

[0046] Among them, a single air duct is used as the object of comparative analysis:

[0047] The flow area of ​​the upstream ring road at the air duct entrance is F1;

[0048] The flow area of ​​the ring road downstream of the air duct is F2;

[0049] The area of ​​a single air duct opening is F3, which is the opening area of ​​the air duct opening;

[0050] The gas flow rate in the annular duct upstream of the duct inlet is Q1;

[0051] The gas flow rate in the annular duct downstream of the duct outlet is Q2;

[0052] The gas flow rate at a single duct opening is Q3, and the flow rate at each duct opening is approximately equal.

[0053] The local resistance loss at the confluence of a single air duct is ΔP;

[0054] The key influencing factor constant for local resistance loss is ξ, which is obtained by looking up a table. Its value is positively correlated with the inflow angle α.

[0055] According to the table, with the flow area remaining constant, the average airflow velocity and the dynamic pressure at a single inclined chute remain constant, and the larger the merging angle α, the greater the local drag coefficient.

[0056] According to the formula ΔP=ξ·dynamic pressure=ξ·1 / 2·ρv 2 It can be known that:

[0057] When Q3 / Q2≈0.4, the confluence angle is 90 degrees to 45 degrees, and the local resistance loss of the branch pipe is reduced from 4.4 to 2.9, a reduction of 34%. Similarly, the local resistance is also reduced by 34%.

[0058] When Q3 / Q2≈0.2, the confluence angle is 90 degrees to 45 degrees, and the local resistance loss of the branch pipe decreases from 0.8 to 0.5, a reduction of 37.5%. Similarly, the local resistance also decreases by 37.5%.

[0059] The local resistance loss of the main pipe converges at an angle of 90 degrees to 45 degrees, and the local resistance loss of the branch pipe decreases from 0.35-0.95 to ≤0.4, a reduction of about 50%. Similarly, the local resistance also decreases by 50%.

[0060]

[0061] Table 1. Furnace Construction Engineering Handbook - Simplified Confluence Local Resistance Coefficient (F3 / F2≈0.2)

[0062]

[0063] Table 2. Furnace Construction Engineering Handbook - Simplified Confluence Local Resistance Coefficient (F3 / F2≈0.1)

[0064] Example 3

[0065] Taking a dry quenching coke oven with a production capacity of 170 tons / hour as an example, the number of air ducts is 20, and F3 / F2≈0.2;

[0066] Reference Figure 13 The inclined air ducts are numbered. The guide wall of the first inclined air duct is a vertical baffle wall 7, which means the confluence angle is 90 degrees. The guide walls of the second to tenth inclined air ducts are all inclined air duct partition walls, with a confluence angle of α.

[0067] Circulating gas flow rate Q = 212500 Nm 3 The circulating gas temperature at this location is approximately 900℃, and the circulating gas density is approximately ρ≈0.31kg / m³. 3 .

[0068] This furnace type has 20 inclined outlets, each with an area of ​​approximately 1.23m². 2 .

[0069] To ensure that the circulating gas flow rate at each air outlet remains as consistent as possible, different numbers of regulating bricks will be installed at the inclined duct openings.

[0070] The closer to the air outlet of the dry quenching furnace, the more adjusting bricks there are, the smaller F3 becomes, and the F3 / F2 changes from about 0.2 to 0.1.

[0071] This assumes that the circulating gas flow rate Q3 is equal for each of the 20 air outlets in the inclined section.

[0072] Q3=Q / 20=212300 / 20=10625Nm 3 / h=2.95Nm 3 / s=2.95·(900+273) / 273m 3 / s = 12.

[0073] 68m 3 / s;

[0074] Gas flow velocity at the inclined air outlet far from the dry quenching furnace outlet without regulating bricks

[0075] v1=Q3 / F3=12.68 / 1.23≈10.31m / s,

[0076] Near the dry quenching furnace outlet, the inclined chute outlet area with a large number of regulating bricks is reduced by half, F3 = 1.23 / 2 = 0.615, and the gas velocity v2 = Q3 / F3 = 12.68 / 0.615 ≈ 20.62 m / s.

[0077] ΔP=ξ·1 / 2·ρv 2 =ξ·1 / 2·0.31·10.31 2 =ξ·16.5;

[0078] When the distance from the exit is greater, fewer bricks are placed, F3 / F2 is close to 0.2, Q3 / Q2≈0.4, from Table 1 we get:

[0079] ξ 90° =4.4ΔP 90° =ξ 90° ·1 / 2·ρv1 2 =4.4·16.5=72.6Pa

[0080] ξ 45° =2.9ΔP 45° =ξ 45° ·1 / 2·ρv1 2 =2.9·16.5=47.85Pa

[0081] The local resistance loss decreased by 24.75 Pa;

[0082] Near the exit, more adjusting bricks are placed, F3 / F2 approaches 0.1, Q3 / Q2 ≈ 0.2, from Table 2 we get:

[0083] ξ 90° =3.0ΔP 90° =ξ 90° ·1 / 2·ρv2 2 =3·65.9 =197.7 Pa

[0084] ξ 45° =2.4ΔP 45° =ξ 45° ·1 / 2·ρv2 2 =2.4·65.9=158.2Pa

[0085] The local resistance loss decreased by 39.5 Pa.

[0086] The resistance within the dry quenching furnace system is related to the energy consumption of the circulating fan. A higher negative pressure at the boiler inlet reduces airflow resistance, thus lessening the load on the circulating fan, reducing fan power consumption, lowering operating costs, and slowing equipment wear. Conversely, high resistance and excessively high negative pressure can easily lead to the intake of external cold air (air leakage) at weak points in the furnace body or pipe seals.

[0087] Reducing resistance helps prevent cold air from diluting the circulating gas, maintaining boiler heat exchange efficiency, and reducing combustion fluctuations or uneven coke cooling caused by air leakage. When the negative pressure is stable at a lower level, the airflow distribution is more uniform, and the boiler operates more smoothly; a stable lower negative pressure also reduces the likelihood of coke floatation and shutdown in the inclined duct area. Simultaneously, it helps increase dry quenching output and improve profitability.

[0088] The overall system resistance is approximately 7000 Pa, with local resistance loss reduced by about 40 Pa, resulting in energy savings of 0.5% from the perspective of fan energy consumption alone. This has a positive impact on the boiler's gas production and stability, as well as coke production.

[0089] The above content is only a preferred embodiment of this utility model. For those skilled in the art, many changes can be made in the specific implementation and application scope based on the concept of this utility model. As long as these changes do not depart from the concept of this utility model, they all fall within the protection scope of this utility model.

Claims

1. A coke dry quenching (CDQ) inclined duct partition wall, characterized by: It includes a first brick and a second brick, both of which are hexahedrons, and the first brick and the second brick are fixedly connected by masonry. The first brick is shaped like a fan-shaped hexahedron with oblique cuts. The upper and lower surfaces of the first brick are staggered. The second brick is also shaped like a fan-shaped hexahedron with oblique cuts. The second brick can be spliced ​​with the first brick to form a continuous oblique wall.

2. A wall for a coke dry quenching inclined duct according to claim 1, characterized in that: The six faces of the first brick are the bottom face, the top face, two inclined sidewalls, and two curved sidewalls. The bottom face and the top face are fan-shaped and offset to the left and right from a top-down view. The curved sidewalls are curved and the two curved sidewalls are concentric arcs. A cross flange is provided on the top face of the first brick.

3. A wall for a coke dry quenching inclined duct according to claim 1, characterized in that: The six surfaces of the second brick are the bottom surface, the top surface, two inclined sidewalls, and two arc-shaped sidewalls. The bottom and top surfaces are fan-shaped and offset to the left and right from a top-down perspective. The arc-shaped sidewalls are arc-shaped and the two arc-shaped sidewalls are concentric arcs. A cross groove is provided on the bottom surface of the second brick.

4. A wall for a coke dry quenching inclined duct according to claim 1, characterized in that: The inclination angle of the inclined air duct partition wall is the ingress angle α, and the ingress angle α is less than or equal to 45 degrees.

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