Dry quenching inclined air duct partition wall and dry quenching ventilation method

Abstract

The invention belongs to the technical field of dry quenching furnace structures, and particularly provides a dry quenching inclined air duct partition wall and a dry quenching ventilation method.The dry quenching inclined air duct partition wall 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] The present invention belongs to the technical field of coke dry quenching furnace structures, and particularly provides a coke dry quenching inclined air duct partition wall and a coke dry quenching ventilation method. Background Art

[0002] The coke dry quenching process, as opposed to wet coke quenching, refers to a coke quenching process that uses an inert gas to cool down the red-hot coke. For the furnace body that cools the red coke through an inert gas, the coke dry quenching furnace generally includes a cooling zone, an inclined duct zone, an annular air duct zone, and a pre-storage zone. The coke moves from bottom to top, and the inert gas moves from bottom to top for forward countercurrent heat exchange. After heat exchange, the inert gas reaches up to 900 °C and converges in the annular air duct.

[0003] The air duct partition wall of the coke dry quenching furnace in use on the market is vertical, that is, the inlet angle at which the air duct air flow converges into the annular air duct is 90 degrees, resulting in a large dynamic pressure loss of the air flow, which is not conducive to the stability of the flow field and is prone to floating coke accidents. Summary of the Invention

[0004] To solve the above technical problems, the technical solution adopted by the present invention is: a coke dry quenching inclined air duct partition wall includes a first brick body and a second brick body. Both the first brick body and the second brick body are hexahedrons, and the first brick body and the second brick body are fixedly connected by masonry;

[0005] The outer shape of the first brick body is a fan-shaped hexahedron cut obliquely. The upper surface and the lower surface of the first brick body are offset. The outer shape of the second brick body is also a fan-shaped hexahedron cut obliquely, and the second brick body can be spliced with the first brick body to form a continuous inclined wall.

[0006] Further, the six faces of the first brick body are respectively a first brick body bottom surface, a first brick body top surface, two first brick body inclined side walls, and two first brick body arc side walls. Among them, the first brick body bottom surface and the first brick body top surface are fan-shaped surfaces, and the first brick body bottom surface and the first brick body top surface are offset in the left-right direction based on a top-down view. The first brick body arc side walls are arc surfaces, and the two first brick body arc side walls are concentric arcs. A cross flange is provided on the top surface of the first brick body.

[0007] Further, the six faces of the second brick body are respectively a second brick body bottom surface, a second brick body top surface, two second brick body inclined side walls, and two second brick body arc side walls. Among them, the second brick body bottom surface and the second brick body top surface are fan-shaped surfaces, and the second brick body bottom surface and the second brick body top surface are offset in the left-right direction based on a top-down view. The second brick body arc side walls are arc surfaces, and the two second brick body arc side walls are concentric arcs. A cross groove is provided on the bottom surface of the second brick body.

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

[0009] A dry coke quenching ventilation method applies a dry coke quenching inclined flue partition wall;

[0010] The dry coke quenching furnace body includes a cooling zone, an inclined flue zone, an annular air duct, and a pre-storage zone. The inclined flue zone is located below the annular air duct, and multiple annularly distributed inclined flue partition walls divide the inclined flue zone into multiple inclined flues;

[0011] Analyzing a single air inlet, the inclined flue and the annular air duct form an asymmetric tee model;

[0012] A number of adjusting bricks are provided at each air inlet.

[0013] Furthermore, a vertical retaining wall and an air outlet are provided in the inner cavity of the inclined flue zone, and the air outlet is located at the opposite position of the vertical retaining wall. The annular space of the inclined flue zone is divided into two semi-annular inclined flue zones. The inclined flue partition walls provided in the two semi-annular inclined flue zones are a clockwise wall and a counterclockwise wall respectively. The inclined flue partition walls cooperate with the corbels to divide the two semi-annular inclined flue zones into multiple inclined flues respectively.

[0014] Furthermore, based on the order from the vertical retaining wall to the air outlet, the number of adjusting bricks at the air inlet increases.

[0015] The beneficial effects of using the present invention are:

[0016] The resistance in the dry coke quenching system is related to the energy consumption of the circulation fan. The negative pressure at the boiler inlet is large, the air flow resistance is reduced, the load of the circulation fan is reduced accordingly, the power consumption of the fan is reduced, the operation cost is reduced, and at the same time the equipment wear is slowed down. Considering only the energy consumption of the fan, the energy saving is 0.5%;

[0017] Reducing the resistance helps to avoid the dilution of the circulating gas by cold air and maintain the heat exchange efficiency in the boiler; reducing the combustion fluctuations or uneven coke cooling problems caused by air leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the inclined flue partition wall of the present invention;

[0019] Figure 2 It is a schematic structural diagram of the first brick body of the inclined flue partition wall of the present invention;

[0020] Figure 3 It is a top view of the first brick body of the inclined flue partition wall of the present invention;

[0021] Figure 4 It is a bottom view of the first brick body of the inclined flue partition wall of the present invention;

[0022] Figure 5 It is a schematic structural diagram of the second brick body of the inclined flue partition wall of the present invention;

[0023] Figure 6It is the top view of the second brick of the inclined air duct partition wall of the present invention;

[0024] Figure 7 It is the bottom view of the second brick of the inclined air duct partition wall of the present invention;

[0025] Figure 8 It is the schematic diagram of the confluence angle of the inclined air duct partition wall of the present invention;

[0026] Figure 9 It is the schematic diagram of the furnace body structure of the upper half of the coke dry quenching of the present invention;

[0027] Figure 10 It is the schematic diagram of the furnace body structure and air flow trajectory of the upper half of the coke dry quenching of the present invention;

[0028] Figure 11 It is the effect comparison diagram after the improvement of the inclined air duct partition wall of the present invention;

[0029] Figure 12 It is the effect comparison diagram before the improvement of the inclined air duct partition wall in the prior art;

[0030] Figure 13 It is the schematic diagram of the numbering of the air inlet of the present invention;

[0031] Figure 14 It is the schematic diagram of the distribution mode of the adjusting bricks of the present invention.

[0032] The reference signs include:

[0033] 1. The first brick;

[0034] 101. The bottom surface of the first brick; 102. The top surface of the first brick; 103. The cross flange; 104. The inclined side wall of the first brick; 105. The arc side wall of the first brick;

[0035] 2. The second brick;

[0036] 201. The bottom surface of the second brick; 202. The top surface of the second brick; 203. The cross groove; 204. The inclined side wall of the second brick; 205. The arc side wall of the second brick;

[0037] 3. The inclined channel area; 4. The annular air duct; 5. The clockwise wall; 6. The counterclockwise wall; 7. The vertical retaining wall; 8. The exhaust port; 9. The adjusting brick. Detailed implementation manners

[0038] The present invention will be described in detail below with reference to the accompanying drawings.

[0039] Refer to Figures 1 - 7 , a coke dry quenching inclined air duct partition wall, comprising a first brick 1 and a second brick 2. Both the first brick 1 and the second brick 2 are hexahedrons, and the first brick 1 and the second brick 2 are fixedly connected by masonry;

[0040] The outer shape of the first brick body 1 is a fan-shaped hexahedron with an oblique cut, and the upper and lower surfaces of the first brick body 1 are offset. The outer shape of the second brick body 2 is also a fan-shaped hexahedron with an oblique cut, and the second brick body 2 can be spliced with the first brick body 1 to form a continuous inclined wall.

[0041] Preferably, the six surfaces of the first brick body 1 are respectively the first brick body bottom surface 101, the first brick body top surface 102, two first brick body inclined side walls 104 and two first brick body arc-shaped side walls 105. Among them, the first brick body bottom surface 101 and the first brick body top surface 102 are fan-shaped surfaces, and the first brick body bottom surface 101 and the first brick body top surface 102 are offset in the left-right direction based on the downward view angle. The first brick body arc-shaped side wall 105 is an arc-shaped surface, and the two first brick body arc-shaped side walls 105 are concentric arcs. The cross-shaped flange 103 is arranged on the first brick body top surface 102.

[0042] Preferably, the six surfaces of the second brick body 2 are respectively the second brick body bottom surface 201, the second brick body top surface 202, two second brick body inclined side walls 204 and two second brick body arc-shaped side walls 205. Among them, the second brick body bottom surface 201 and the second brick body top surface 202 are fan-shaped surfaces, and the second brick body bottom surface 201 and the second brick body top surface 202 are offset in the left-right direction based on the downward view angle. The second brick body arc-shaped side wall 205 is an arc-shaped surface, and the two second brick body arc-shaped side walls 205 are concentric arcs. The cross-shaped groove 203 is arranged on the second brick body bottom surface 201.

[0043] The inclination angle of the inclined air duct partition wall is the inlet angle α;

[0044] Preferably, the inlet angle α is less than or equal to 45 degrees.

[0045] Referring to Figures 8 - 12 , a dry quenching ventilation method 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. A plurality of annularly distributed inclined air duct partition walls divide the inclined duct zone 3 into a plurality of inclined air ducts;

[0046] Analyzing a single air duct opening, the inclined air duct and the annular air duct form an asymmetric tee model;

[0047] A number of adjusting bricks 9 are arranged at each air duct opening.

[0048] Specifically, the inner cavity of the ramp area 3 is provided with a vertical retaining wall 7 and an air outlet 8, and the air outlet 8 is located opposite to the vertical retaining wall 7. That is, the annular space of the ramp area 3 is divided into two semi-annular ramp areas. The inclined air duct partitions arranged in the two semi-annular ramp areas are the clockwise wall 5 and the counterclockwise wall 6 respectively. The inclined air duct partitions cooperate with the corbels to divide the two semi-annular ramp areas into multiple inclined air ducts respectively. The circulating gas flows out from the air duct openings of the inclined air ducts from bottom to top and converges obliquely into the annular air duct 4;

[0049] As the gas accumulates by flowing into each air duct opening one by one, more and more airflows converge in the annular air duct 4. Therefore, the dynamic pressure of the airflow at the vertical retaining wall 7 is the smallest, and the dynamic pressure of the airflow at the air outlet 8 is the largest;

[0050] Based on the order from the vertical retaining wall 7 to the air outlet 8, the number of adjustment bricks 9 at the air duct opening increases.

[0051] Furthermore, let the gas flow rate be Q (Nm 3 / h), the flow area be F (m 2 ), and the convergence angle be α (°);

[0052] Among them, taking a single air duct as the object of comparative analysis:

[0053] The flow area of the annular duct upstream of the air duct opening is F1;

[0054] The flow area of the annular duct downstream of the air duct opening is F2;

[0055] The area of a single air duct opening is F3, that is, the opening area of the air duct opening;

[0056] The gas flow rate in the annular air duct upstream of the air duct opening is Q1;

[0057] The gas flow rate in the annular air duct downstream of the air duct opening is Q2;

[0058] The gas flow rate of a single air duct opening is Q3, and each air duct opening is approximately equal;

[0059] The local resistance loss at the confluence of a single air duct is ΔP;

[0060] The key influencing factor constant of the local resistance loss is ξ, which is obtained by looking up the table, and its numerical value is positively correlated with the convergence angle α;

[0061] It can be known by looking up the table that when the flow area remains unchanged, the average flow velocity of the airflow and the dynamic pressure of a single inclined air duct opening remain unchanged, and the larger the convergence angle α, the larger the local resistance coefficient.

[0062] According to the formula ΔP = ξ·dynamic pressure = ξ·1 / 2·ρv 2 It can be known that:

[0063] When Q3 / Q2 ≈ 0.4, the inlet angle ranges from 90 degrees to 45 degrees, and the local resistance loss of the branch pipe decreases from 4.4 to 2.9, a reduction of 34%. Similarly, the local resistance also decreases by 34%.

[0064] When Q3 / Q2 ≈ 0.2, the inlet angle ranges from 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%.

[0065] When the inlet angle of the main pipe's local resistance loss ranges from 90 degrees to 45 degrees, the local resistance loss of the branch pipe decreases from 0.35 - 0.95 to ≤0.4, a reduction of approximately 50%. Similarly, the local resistance also decreases by 50%.

[0066]

[0067] Table 1 "Furnace Building Engineering Manual" - Simplified combined flow local resistance coefficient (F3 / F2 ≈ 0.2)

[0068]

[0069] Table 2 "Furnace Building Engineering Manual" - Simplified combined flow local resistance coefficient (F3 / F2 ≈ 0.1)

[0070] Example 3

[0071] Taking a coke dry quenching furnace with a production capacity of 170 tons per hour as an example, the number of air duct openings is 20, and F3 / F2 ≈ 0.2;

[0072] Refer to Figure 13 , number the inclined air ducts. The guiding wall of the first inclined air duct is the vertical retaining wall 7, that is, the inlet angle is 90 degrees, and the guiding walls of the second to tenth inclined air ducts are all inclined air duct partition walls, and the inlet angle is α;

[0073] The circulating gas flow rate Q = 212500 Nm 3 / h, the circulating gas temperature at this place is about 900 °C, and the circulating gas density ρ ≈ 0.31 kg / m 3 .

[0074] This furnace type has 20 inclined duct outlets, and the area of each is about 1.23 m 2 .

[0075] The process requirement is to ensure that the circulating gas flow rate at each air outlet is as consistent as possible, and different numbers of regulating bricks will be installed at the inclined duct openings.

[0076] The more the number of regulating bricks is towards the coke dry quenching furnace air outlet, the smaller F3 becomes, and F3 / F2 changes from about 0.2 to 0.1.

[0077] Assume that the circulating gas flow rate Q3 at each of the 20 air outlets in the inclined duct area is equal.

[0078] Q3 = Q / 20 = 212300 / 20 = 10625 Nm 3 / h = 2.95 Nm 3 / s = 2.95·(900 + 273) / 273 m 3 / s = 12.

[0079] 68 m 3 / s;

[0080] Gas flow velocity at the outlet of the inclined duct where no regulating bricks are placed away from the CDQ outlet

[0081] v1 = Q3 / F3 = 12.68 / 1.23 ≈ 10.31 m / s,

[0082] Near the CDQ outlet, where more regulating bricks are placed, the outlet area of the inclined duct is reduced by half, F3 = 1.23 / 2 = 0.615, and the gas flow velocity v2 = Q3 / F3 = 12.68 / 0.615 ≈ 20.62 m / s,

[0083] ΔP = ξ·1 / 2·ρv 2 = ξ·1 / 2·0.31·10.31 2 = ξ·16.5;

[0084] When away from the outlet, fewer regulating bricks are placed, F3 / F2 is close to 0.2, Q3 / Q2 ≈ 0.4. Looking up Table 1, we get:

[0085] ξ 90° = 4.4ΔP 90° = ξ 90° ·1 / 2·ρv1 2 = 4.4·16.5 = 72.6 Pa

[0086] ξ 45° = 2.9ΔP 45° = ξ 45° ·1 / 2·ρv1 2 = 2.9·16.5 = 47.85 Pa

[0087] The local resistance loss is reduced by 24.75 Pa;

[0088] When near the outlet, more regulating bricks are placed, F3 / F2 is close to 0.1, Q3 / Q2 ≈ 0.2. Looking up Table 2, we get:

[0089] ξ 90° = 3.0ΔP 90° = ξ 90° ·1 / 2·ρv2 2 = 3·65.9 = 197.7 Pa

[0090] ξ45° = 2.4ΔP 45° = ξ 45° ·1 / 2·ρv2 2 = 2.4·65.9 = 158.2 Pa

[0091] The local resistance loss is reduced by 39.5 Pa.

[0092] The resistance in the CDQ system is related to the energy consumption of the circulation fan. The negative pressure at the boiler inlet, the air flow resistance decreases, the load of the circulation fan is reduced accordingly, the power consumption of the fan is reduced, the operation cost is reduced, and at the same time the equipment wear is slowed down. If the resistance is large, too high negative pressure is likely to cause external cold air to be sucked into the weak sealing parts of the furnace body or pipelines (air leakage).

[0093] Reducing the resistance helps to avoid the dilution of the circulating gas by cold air and maintain the heat exchange efficiency in the boiler; reduce the combustion fluctuations or uneven coke cooling problems caused by air leakage. When the negative pressure is stabilized at a lower level, the air flow distribution is more uniform and the boiler operates more smoothly; when the negative pressure is stabilized at a lower level, it is not easy to produce the phenomenon of coke floating and production stoppage in the inclined channel area. At the same time, it helps to increase the CDQ output and improve the efficiency.

[0094] The total resistance of the whole system is about 7000 Pa, the local resistance loss is reduced by about 40 Pa, and considering only from the perspective of the fan energy consumption, the energy saving is 0.5%. It has a positive impact on the steam generation capacity and stability of the boiler, as well as the coke output.

[0095] The above content is only the preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, many changes can be made in the specific implementation manner and application scope. As long as these changes do not depart from the concept of the present invention, they all belong to the protection scope of the present invention.

Claims

1. A dry quenching coke diagonal air duct partition wall, characterized in that: It 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 by masonry; The first brick body has an obliquely cut sector-shaped hexahedron shape, the upper surface and the lower surface of the first brick body are staggered, the second brick body also has an obliquely cut sector-shaped hexahedron shape, and the second brick body can be spliced with the first brick body to form a continuous oblique wall.

2. The dry quenching coke inclined air duct partition wall according to claim 1, wherein: The six surfaces of the first brick body are respectively the bottom surface of the first brick body, the top surface of the first brick body, two inclined side walls of the first brick body and two curved side walls of the first brick body, wherein the bottom surface of the first brick body and the top surface of the first brick body are fan-shaped surfaces, and the bottom surface of the first brick body and the top surface of the first brick body are staggered in the left and right directions based on the top view, the curved side wall of the first brick body is a curved surface, and the two curved side walls of the first brick body are concentric arcs, and a cross flange is arranged on the top surface of the first brick body.

3. A dry quenching coke inclined air duct partition wall according to claim 1, characterized in that: The six surfaces of the second brick body are respectively the bottom surface of the second brick body, the top surface of the second brick body, two inclined side walls of the second brick body and two curved side walls of the second brick body, wherein the bottom surface of the second brick body and the top surface of the second brick body are fan-shaped surfaces, and the bottom surface of the second brick body and the top surface of the second brick body are staggered in the left and right directions based on the top view, the curved side wall of the second brick body is a curved surface, and the two curved side walls of the second brick body are concentric arcs, and a cross groove is arranged on the bottom surface of the second brick body.

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

5. A CDQ ventilation method, using a CDQ oblique air duct partition wall; The dry coke quenching oven body includes a cooling area, a chute area, an annular air duct and a pre-storage area. The chute area is located below the annular air duct. A plurality of annularly distributed chute partition walls divide the chute area into a plurality of chute air ducts. In terms of the analysis of a single air duct opening, the oblique air duct and the circular air duct form an asymmetric three-way model; A number of adjustment bricks are arranged at each air duct opening.

6. A dry quenching ventilation method according to claim 5, characterized in that: The inner cavity of the inclined channel area is provided with a vertical retaining wall and an exhaust port, and the exhaust port is located opposite to the vertical retaining wall. The annular space of the inclined channel area is divided into two semi-annular inclined channel areas. The inclined air duct partition walls arranged in the two semi-annular inclined channel areas are respectively a clockwise wall and a counterclockwise wall. The inclined air duct partition walls cooperate with the corbels to divide the two semi-annular inclined channel areas into multiple inclined air ducts.

7. A dry quenching ventilation method according to claim 5, characterized in that: Based on the sequence from the vertical retaining wall to the exhaust vent, the number of adjustment bricks at the air duct opening increases.

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