A flue gas distributor

Abstract

The application discloses a flue gas distributor, which comprises a main air pipe, and one end or both ends of the main air pipe are communicated with a plurality of branch air pipes with smaller pipe diameters than the main air pipe; the pipe diameter of the branch air pipe close to the main air pipe is larger than that of the branch air pipe far away from the main air pipe on the same side; transition pipes are arranged between adjacent air pipes for connection, and the transition pipes are internally provided with adjusting valves for controlling the gas flow between the air pipes. Compared with the prior art which only relies on the pipe diameter of the air pipe to control the flue gas flow of each flue gas outlet, the application has additional active adjusting capacity by using the adjusting valves, so that the phenomenon that the flue gas flow is not balanced when being discharged from each air outlet can be effectively avoided, and the normal production of the subsequent production can be ensured.

Description

Technical Field

[0001] This invention relates primarily to the field of iron and steel smelting technology, and more particularly to a flue gas distributor. Background Technology

[0002] Existing flue gas distributors rely solely on the duct diameter to regulate the flue gas flow rate at each outlet (e.g., Chinese Patent No. 201610120979.5, "A Flue Gas Distributor and Sintering Flue Gas Circulation Device"). Once manufactured, the duct diameters of such distributors cannot be actively changed. Furthermore, when changes in airflow, dust accumulation altering the duct cross-sectional area, or turbulence within the duct cause unequal flue gas flow rates at each outlet, further adjustments are impossible, leading to uneven distribution and severely impacting subsequent production. Therefore, a flue gas distributor with active adjustment capabilities is urgently needed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a flue gas distributor with active adjustment function.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A flue gas distributor includes a main duct, one or both ends of which are connected to several sections of auxiliary ducts with a diameter smaller than that of the main duct, and the diameter of the auxiliary ducts closer to the main duct is larger than that of the auxiliary ducts on the same side away from the main duct; adjacent ducts are connected by transition pipes, and the transition pipes have built-in regulating valves for controlling the gas flow rate between the ducts.

[0006] As a further improvement to the above technical solution:

[0007] Several oxygen distribution pipes are installed at intervals along the length of the main air duct and the secondary air duct. The oxygen distribution pipes are used to input external oxygen into the main air duct and / or the secondary air duct so that the oxygen content in the air duct is increased uniformly.

[0008] The opening and closing of each oxygen distribution tube and the oxygen delivery rate are controlled independently.

[0009] Several oxygen content detectors are installed at intervals inside the main air duct and the secondary air duct. Each oxygen content detector corresponds to an oxygen distribution pipe and is signal-connected. The oxygen distribution pipe adjusts its opening and closing and oxygen delivery volume according to the detection value of the oxygen content detector.

[0010] The main air duct and the transition pipe, as well as the auxiliary air duct and the transition pipe, are detachably connected.

[0011] The transition tube is configured as a variable cross-section tube.

[0012] The regulating valve includes an adjusting ring, a driving part, and a wind plate connected in sequence. The adjusting ring is rotatably sleeved on one end of the transition tube. The driving part and the wind plate are built into the transition tube. The adjusting ring adjusts the posture of the wind plate by rotating the driving part, thereby changing the opening degree of the regulating valve.

[0013] The driving unit includes a rod one connected to the opposite side of the adjusting ring. A lead screw is vertically fixed to the middle of the rod one. The central axis of the lead screw coincides with the central axis of the transition tube, and the end of the lead screw away from the rod one is hinged to a rod two fixed at both ends to the transition tube. A slider is sleeved on the lead screw, and the slider is connected to the air plate. The rod one and the lead screw are driven to rotate by the adjusting ring, which in turn drives the slider to move along the central axis of the transition tube, further driving the air plate to adjust its posture to change the opening degree of the regulating valve.

[0014] The wind deflector includes several base rods distributed circumferentially along the transition pipe. A wind deflector is formed on one side of each base rod, and one end of each base rod is hinged to the inner wall of the transition pipe, while the other end is hinged to a slider via a connecting rod. Driven by the slider and the connecting rod, the base rod and the wind deflector can be flipped.

[0015] The free end of the wind deflector is bent toward the central axis of the transition tube.

[0016] Multiple layers of windbreak plates are formed at intervals on the same base pole.

[0017] The air vane is blade-shaped, fixed to the slider and perpendicular to the central axis of the transition tube, and the air vane can move along the central axis of the transition tube following the slider.

[0018] The regulating valve also includes an elastic braking mechanism for regulating the speed of the air vane. One end of the elastic braking mechanism is fixedly connected to the drive unit, and the other end can abut against the air vane and generate friction.

[0019] The main duct and / or the secondary duct are equipped with a support member to prevent duct deformation; the support member includes an outer ring perpendicular to the length of the duct and fitted to the inner wall of the duct, and the outer ring has a plurality of struts formed on opposite sides.

[0020] An oxygen distribution tube for supplying oxygen into the air duct is fixed to the support rod.

[0021] The support rod and the second rod are detachably connected via a positioning rod, and the central axis of the positioning rod coincides with the central axis of the transition tube.

[0022] Compared with the prior art, the advantages of the present invention are as follows:

[0023] The main duct has an air inlet, and the secondary ducts both have air outlets. After entering the main duct, the flue gas is distributed into the secondary ducts and discharged through the corresponding outlets. By installing regulating valves within the transition pipes, the flue gas velocity in corresponding sections of the duct can be altered, thereby changing the exhaust volume at the corresponding outlets. Compared to existing technologies that rely solely on duct diameter to regulate flue gas flow at each outlet, this application utilizes regulating valves to achieve additional active regulation capabilities. This effectively prevents uneven flue gas flow at each outlet, ensuring the normal operation of subsequent production. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the flue gas distributor;

[0025] Figure 2 This is a cross-sectional schematic diagram of the transition pipe (including the regulating valve) in Example 1 (State 1);

[0026] Figure 3 This is a cross-sectional schematic diagram of the transition pipe (including the regulating valve) in Example 1 (State 2);

[0027] Figure 4 This is a partial cross-sectional schematic diagram of a flue gas distributor;

[0028] Figure 5 This is a structural schematic diagram of the support component;

[0029] Figure 6 This is a cross-sectional schematic diagram of the transition pipe (including the regulating valve) in Example 2 (State 1);

[0030] Figure 7 This is a cross-sectional schematic diagram of the transition pipe (including the regulating valve) in Example 2 (State 2);

[0031] Figure 8 This is a schematic diagram of the verification device set up according to Embodiment 1;

[0032] Figure 9 This is a schematic diagram of the structure of a verification device based on existing technology;

[0033] Figure 10 This is a schematic diagram of the verification device set up according to Embodiment 2;

[0034] Figure 11 This is a schematic diagram of the verification device set up according to Embodiment 1 and Embodiment 2.

[0035] The labels in the diagram represent: 1. Main air duct; 2. Spur air duct; 3. Transition pipe; 4. Regulating valve; 41. Regulating ring; 42. Drive unit; 421. Rod 1; 422. Lead screw; 423. Rod 2; 424. Slider; 43. Air vane; 431. Base rod; 432. Baffle plate; 433. Connecting rod; 44. Elastic braking mechanism; 5. Support component; 51. Outer ring; 52. Support rod; 53. Oxygen distribution pipe; 54. Positioning rod. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] like Figures 1 to 5 As shown, the flue gas distributor in this embodiment includes a main duct 1. One or both ends of the main duct 1 are connected to several sections of auxiliary ducts 2 with diameters smaller than the main duct 1. The diameter of the auxiliary duct 2 closer to the main duct 1 is larger than the diameter of the auxiliary duct 2 on the same side away from the main duct 1. Adjacent ducts are connected by transition pipes 3, and the transition pipes 3 have built-in regulating valves 4 for controlling the gas flow rate between the ducts. The main duct 1 has an air inlet, and the auxiliary ducts 2 have air outlets. After entering the main duct 1, the flue gas is distributed into the auxiliary ducts 2 and discharged from the corresponding air outlets. By setting the regulating valves 4 in the transition pipes 3, the flue gas velocity in the corresponding section of the pipe can be changed, thereby changing the exhaust volume of the corresponding air outlet. Compared with the prior art, which only relies on the duct diameter to regulate the flue gas flow rate at each flue gas outlet, this application uses regulating valves 4 to obtain additional active regulation capability, thereby effectively avoiding the phenomenon of uneven flue gas flow rate discharged from each air outlet, and thus ensuring the normal operation of subsequent production.

[0039] In this embodiment, several oxygen distribution pipes 53 are installed at intervals along the length of the main duct 1 and the secondary duct 2. These oxygen distribution pipes 53 are used to introduce external oxygen into the main duct 1 and / or the secondary duct 2, thereby uniformly increasing the oxygen content within the ducts. The opening and closing of each oxygen distribution pipe and its oxygen delivery rate are independently controlled. Several oxygen content detectors are installed at intervals within the main duct 1 and the secondary duct 2. Each oxygen content detector corresponds to one oxygen distribution pipe 53 and is signal-connected. The oxygen distribution pipe 53 adjusts its opening and closing and oxygen delivery rate based on the detection values ​​of the oxygen content detectors. When the oxygen content in the circulating flue gas is too low, it will be detrimental to sintering. By installing oxygen distribution pipes 53 within the ducts, external oxygen can be introduced into the ducts to increase the oxygen content. Furthermore, because the ducts are long and cylindrical, in order to ensure that the oxygen content is basically uniform throughout the ducts, the oxygen distribution pipes 53 are spaced apart along the length of the ducts, allowing oxygen to be injected at various points within the ducts. Meanwhile, the distribution of oxygen changes during flue gas flow. To enable localized oxygen supplementation, the opening and closing of each oxygen distribution pipe 53 and its oxygen delivery rate are set to independent control modes. Furthermore, to obtain timely oxygen content data from various parts of the duct and adjust the oxygen delivery rate accordingly, several oxygen content detectors are installed at intervals within the main duct 1 and the secondary duct 2. In principle, one oxygen content detector is configured for each oxygen distribution pipe 53. These detectors are located close to and signal-connected to the corresponding oxygen distribution pipe 53. The oxygen content information obtained by the detectors is used to guide and control the opening and closing of the corresponding oxygen distribution pipe 53 and the flow rate adjustment, thus forming a feedback mechanism.

[0040] In this embodiment, the main duct 1 and the transition pipe 3, as well as the auxiliary duct 2 and the transition pipe 3, are detachably connected. The flue gas distributor is relatively large, making it difficult to transport as a whole. By making the connections between the main duct 1 and the transition pipe 3, and between the auxiliary duct 2 and the transition pipe 3, detachable connections can be made, allowing for individual transport of each component and reducing space requirements. Specifically, the connections between the main duct 1 and the transition pipe 3, and between the auxiliary duct 2 and the transition pipe 3, can be threaded, flanged, or snap-fit.

[0041] In this embodiment, the transition pipe 3 is configured as a variable cross-section pipe. Since the cross-sectional area of ​​the main air duct 1 is larger than that of the auxiliary air duct 2, and the cross-sectional areas of adjacent auxiliary air ducts 2 on the same side are also different, in order to achieve the connection, the transition pipe 3 is configured as a variable cross-section pipe, with the cross-sectional sizes at both ends adapted to the cross-sectional sizes of the connected air ducts.

[0042] In this embodiment, the regulating valve 4 includes an adjusting ring 41, a driving part 42, and a wind plate 43 connected in sequence. The adjusting ring 41 is rotatably sleeved on one end of the transition pipe 3. The driving part 42 and the wind plate 43 are built into the transition pipe 3. The adjusting ring 41 adjusts the posture of the wind plate 43 via the driving part 42 by rotating, thereby changing the opening degree of the regulating valve 4. The adjusting ring 41 is an annular sleeve structure that is sleeved on one end of the transition pipe 3 and can rotate along the central axis of the transition pipe 3, thereby driving the driving part 42 built into the transition pipe 3 to operate. The flue gas diffuses from the main duct 1 to the secondary duct 2. Its diffusion rate is directly proportional to the cross-sectional area of ​​the duct used for flue gas flow. By setting up the regulating valve 4, the adjusting ring 41 changes the posture of the wind plate 43 via the driving part 42, thereby changing the opening degree of the regulating valve 4, that is, changing the cross-sectional area of ​​the duct used for flue gas flow, thereby affecting the diffusion rate of the flue gas and realizing active intervention in the flue gas delivery.

[0043] In this embodiment, the drive unit 42 includes a first rod 421 connected to the opposite side of the adjusting ring 41. A lead screw 422 is vertically fixed to the middle of the first rod 421. The central axis of the lead screw 422 coincides with the central axis of the transition pipe 3, and one end away from the first rod 421 is hinged to a second rod 423 whose two ends are fixed on the transition pipe 3. A slider 424 is sleeved on the lead screw 422, and the slider 424 is connected to the air plate 43. The first rod 421 and the lead screw 422 are driven to rotate by the adjusting ring 41, which in turn drives the slider 424 to move along the central axis of the transition pipe 3, further driving the air plate 43 to adjust its posture to change the opening degree of the regulating valve 4, thereby changing the gap between adjacent baffles 432 and thus changing the cross-sectional size of the transition pipe 3 for gas flow. The adjusting ring 41 is sleeved on the transition pipe 3, and the first rod 421 is arranged along the diameter of the adjusting ring 41. The first rod 421 can rotate with the adjusting ring 41. The middle part of rod 421 is fixed to lead screw 422, which rotates around the central axis under the drive of adjusting ring 41. A slider 424 is sleeved on lead screw 422, and the slider 424 is threadedly engaged with lead screw 422. When lead screw 422 rotates, it drives slider 424 to move along the length of lead screw 422. Since slider 424 is also connected to air vane 43, the posture of air vane 43 changes under the drive of slider 424, thereby adjusting the size of the cross section used for gas flow in transition pipe 3.

[0044] In this embodiment, the wind deflector 43 includes several base rods 431 distributed circumferentially along the transition pipe 3. A baffle plate 432 is formed on one side of each base rod 431. One end of each base rod 431 is hinged to the inner wall of the transition pipe 3, and the other end is hinged to a slider 424 via a connecting rod 433. Driven by the slider 424 and the connecting rod 433, the base rod 431 and the baffle plate 432 can rotate. The free end of the baffle plate 432 bends towards the central axis of the transition pipe 3. Multiple layers of baffle plates 432 are formed at intervals on the same base rod 431. The gaps between adjacent baffle plates 432 serve as channels for flue gas movement. When the baffle plates 432 rotate with the connecting rod 433, the gaps between them change angle, thereby forcing a change in the direction of flue gas movement. Furthermore, because the baffle plates 432 have multiple layers, they can separate the flue gas into multiple layers, effectively reducing turbulence within the duct. Meanwhile, compared to… Figure 2 and Figure 3 Since the baffle plate 432 is in an inclined and bent state, when its free end is flipped toward the central axis of the transition pipe 3, the section in the transition pipe 3 used for gas flow will be blocked by the baffle plate 432, thereby enabling the opening and closing of the regulating valve 4.

[0045] In this embodiment, the main duct 1 and / or the secondary duct 2 are equipped with a support member 5 to prevent duct deformation. The support member 5 includes an outer ring 51 perpendicular to the length of the duct and fitted to the inner wall of the duct. The outer ring 51 has several struts 52 formed on opposite sides. Since the duct has a shell-like structure, it is prone to compression deformation during transportation. By setting the support member 5, additional support can be provided for the duct along the axial direction, thereby improving the structure's resistance to deformation.

[0046] In this embodiment, an oxygen distribution pipe 53 for supplying oxygen into the duct is fixed on the support rod 52. During flue gas circulation, the oxygen content in the circulating flue gas is low, making it difficult to meet sintering requirements. By setting the oxygen distribution pipe 53 on the support rod 52, external oxygen can be input into the duct, thereby achieving an oxygenation effect. The oxygen distribution pipe 53 is arranged in several concentric circles and connected by an oxygen supply pipe. The distal end of the oxygen supply pipe is connected to an external oxygen generator to supply oxygen to the oxygen distribution pipe 53. By arranging the oxygen distribution pipe 53 in several concentric circles, the flue gas collides with the oxygen distribution pipe 53 and stratifies as it flows through the support rod 52, thereby suppressing turbulence in the flue gas within the duct.

[0047] In this embodiment, the support rod 52 and the second rod 423 are detachably connected via the positioning rod 54, and the central axis of the positioning rod 54 coincides with the central axis of the transition pipe 3. By setting the support rod 52, the adjacent air ducts are pulled and positioned, thereby improving the overall strength of the flue gas distributor.

[0048] When the oxygen content in the circulating flue gas is too low, sintering will be hindered. In this case, oxygen needs to be injected into the air duct through the oxygen distribution pipe 53. Although the prior art has an oxygen injection structure, it is difficult for the oxygen injected into the air duct to mix quickly and evenly with the circulating flue gas, resulting in a large difference in the oxygen content of the circulating flue gas discharged through the air outlet, which in turn affects the sintering effect. In this embodiment, the oxygen distribution pipe 53 is set in a plurality of concentric circles, and each concentric circle is evenly provided with a plurality of oxygen outlet holes, so that oxygen can be evenly distributed from the oxygen distribution pipe 53 into the air duct. On the other hand, by setting the free end of the baffle plate 432 to bend towards the central axis of the transition pipe 3, each layer of baffle plates 432 arranged radially forms a structure similar to an umbrella. When the circulating flue gas and the oxygen input into the duct from the oxygen distribution pipe 53 flow past the edge of the umbrella-shaped structure, they will collide with the free end of the bent baffle plate 432. This collision will drive the circulating flue gas and oxygen to bounce and intertwine, thereby merging with each other and effectively improving the mixing degree of oxygen and circulating flue gas. Moreover, multiple layers of baffle plates 432 are formed at intervals on the same base rod 431, thus forming a multi-layered umbrella-shaped structure. When the gas flows between the layers of umbrella-shaped structures, it will also collide and merge multiple times, thereby further improving the mixing degree of oxygen and circulating flue gas. In other words, by simultaneously setting concentric oxygen distribution pipes 53 and stacked umbrella-shaped baffle plates 432, it can help the oxygen injected into the duct to diffuse evenly and merge quickly with the circulating flue gas, avoiding the phenomenon of uneven oxygen distribution affecting the sintering effect. To verify the effectiveness of this structure in achieving rapid and uniform mixing of oxygen, the following verifications were conducted:

[0049] The calculation method for the uniformity of the flow field inside the flue gas distributor is shown in the following formula:

[0050]

[0051] In the formula: γv is the flow field uniformity coefficient, which is [0, 1]. The larger γv is, the better the mixing effect of the mixed gas in the flue gas distributor; Vj and V are the velocity of a certain measurement point in the flue gas distributor and the average velocity of the cross section in the flue gas distributor, respectively, in m / s.

[0052] The verification device is set according to Example 1 as follows: Figure 8 As shown, B1 is the oxygen replenishment point, where an oxygen distribution pipe 53 is installed, and five detection points (C0, C1, C2, C3, and C4) are set up. After the sintering flue gas and the annular cooling exhaust gas are mixed, the flue gas flow rate is 4000 Nm³ / min; the oxygen content in the mixed flue gas is 17.86%; the supplementary oxygen volume fraction is 99%, and the supplementary oxygen flow rate is 15 Nm³ / min. The flow field uniformity coefficient and flue gas content detected at each detection point are as follows:

[0053] testing point C0 C1 C2 C3 C4 Flow field uniformity coefficient 0.3067 0.4434 0.4772 0.4835 0.5002 Oxygen content in flue gas (%) 17.86 18.12 18.09 18.04 18.02

[0054] In contrast, a verification device is set up according to existing technology (taking Chinese patent CN 105758199 A as an example). Figure 9 As shown, B1 is the oxygen replenishment point, where an oxygen distribution pipe 53 is installed, and five detection points (C0, C1, C2, C3, and C4) are set up. After the sintering flue gas and the annular cooling exhaust gas are mixed, the flue gas flow rate is 4000 Nm³ / min; the oxygen content in the mixed flue gas is 17.86%; the supplementary oxygen volume fraction is 99%, and the supplementary oxygen flow rate is 15 Nm³ / min. The flow field uniformity coefficient and flue gas content detected at each detection point are as follows:

[0055] testing point C0 C1 C2 C3 C4 Flow field uniformity coefficient 0.3067 0.3069 0.3068 0.3066 0.3070 Oxygen content in flue gas (%) 17.86 17.85 17.85 17.87 17.86

[0056] Comparing the two, it can be seen that the oxygen content in the flue gas measured at the C1-C4 detection points is significantly higher than that of the prior art when the oxygen content in the flue gas at the C0 detection point remains unchanged. Therefore, it can be proven that by simultaneously setting concentric oxygen distribution pipes 53 and stacked umbrella-shaped wind deflectors 432 in this embodiment, the oxygen injected into the air duct can be evenly diffused and quickly integrated with the circulating flue gas.

[0057] Example 2

[0058] like Figure 6 and Figure 7 As shown, the second embodiment of the flue gas distributor of the present invention is basically the same as that of the first embodiment, except that: in this embodiment, the air plate 43 is blade-shaped, the air plate 43 is fixed to the slider 424 and perpendicular to the central axis of the transition tube 3, the air plate 43 can follow the slider 424 to move along the central axis of the transition tube 3, thereby changing the distance between its edge and the inner wall of the transition tube 3, and thus changing the cross-sectional size of the transition tube 3 for gas flow.

[0059] In this embodiment, the regulating valve 4 further includes an elastic braking mechanism 44 for regulating the rotational speed of the air deflector 43. One end of the elastic braking mechanism 44 is fixedly connected to the drive unit 42, and the other end can abut against the air deflector 43 and generate friction. When the air deflector 43 moves toward the elastic braking mechanism 44, the two are squeezed together, thereby reducing the rotational speed of the air deflector 43 through friction; when the air deflector 43 moves away from the elastic braking mechanism 44, the pressure between the two decreases and the friction decreases, thereby increasing the rotational speed of the air deflector 43. When the rotational speed of the air deflector 43 increases, the guiding effect on the flue gas can be improved; conversely, the obstruction effect on the flue gas is enhanced. Therefore, by changing the rotational speed of the air deflector 43, the flow rate of the flue gas can be further regulated.

[0060] When the oxygen content in the circulating flue gas is too low, sintering will be hindered. In this case, oxygen needs to be injected into the air duct through the oxygen distribution pipe 53. Although the existing technology has an oxygen injection structure, it is difficult for the oxygen injected into the air duct to mix quickly and evenly with the circulating flue gas, resulting in a large difference in the oxygen content of the circulating flue gas discharged through the air outlet, which in turn affects the sintering effect. In this embodiment, on the one hand, the oxygen distribution pipe 53 is set in a plurality of concentric circles, and a plurality of oxygen outlet holes are evenly opened on each concentric circle, so that oxygen can be evenly distributed from the oxygen distribution pipe 53 into the air duct. On the other hand, by setting the air vane 43 in a blade shape, the oxygen flowing in the front collides with it, thereby generating a rebound and merging with the circulating flue gas. At the same time, the rotation of the air vane 43 can effectively disturb the circulating flue gas and the oxygen input into the air duct from the oxygen distribution pipe 53, so that the oxygen can be fully diffused in the circulating flue gas, thereby achieving a uniform distribution effect. In other words, by simultaneously setting concentric oxygen distribution pipes 53 and rotatable blade-shaped air vanes 43, the oxygen injected into the air duct can be evenly diffused and quickly mixed with the circulating flue gas, avoiding the phenomenon of uneven oxygen distribution affecting the sintering effect. To verify the effect of this structure on rapid and uniform oxygen mixing, the following verifications were conducted:

[0061] The calculation method for the uniformity of the flow field inside the flue gas distributor is shown in the following formula:

[0062]

[0063] In the formula: γv is the flow field uniformity coefficient, which is [0, 1]. The larger γv is, the better the mixing effect of the mixed gas in the flue gas distributor; Vj and V are the velocity of a certain measurement point in the flue gas distributor and the average velocity of the cross section in the flue gas distributor, respectively, in m / s.

[0064] The verification device is set according to Example 2, as follows: Figure 10 As shown, B1 is the oxygen replenishment point, where an oxygen distribution pipe 53 is installed, and five detection points (C0, C1, C2, C3, and C4) are set up. After the sintering flue gas and the annular cooling exhaust gas are mixed, the flue gas flow rate is 4000 Nm³ / min; the oxygen content in the mixed flue gas is 17.86%; the supplementary oxygen volume fraction is 99%, and the supplementary oxygen flow rate is 15 Nm³ / min. The flow field uniformity coefficient and flue gas content detected at each detection point are as follows:

[0065] testing point C0 C1 C2 C3 C4 Flow field uniformity coefficient 0.3067 0.3834 0.4172 0.4335 0.4402 Oxygen content in flue gas (%) 17.86 18.12 18.06 18.02 18.01

[0066] In contrast, a verification device is set up according to existing technology (taking Chinese patent CN 105758199 A as an example). Figure 9As shown, B1 is the oxygen replenishment point, where an oxygen distribution pipe 53 is installed, and five detection points (C0, C1, C2, C3, and C4) are set up. After the sintering flue gas and the annular cooling exhaust gas are mixed, the flue gas flow rate is 4000 Nm³ / min; the oxygen content in the mixed flue gas is 17.86%; the supplementary oxygen volume fraction is 99%, and the supplementary oxygen flow rate is 15 Nm³ / min. The flow field uniformity coefficient and flue gas content detected at each detection point are as follows:

[0067] testing point C0 C1 C2 C3 C4 Flow field uniformity coefficient 0.3067 0.3069 0.3068 0.3066 0.3070 Oxygen content in flue gas (%) 17.86 17.85 17.85 17.87 17.86

[0068] Comparing the two, it can be seen that the oxygen content in the flue gas measured at the C1-C4 detection points is significantly higher than that of the prior art when the oxygen content in the flue gas at the C0 detection point remains unchanged. Therefore, it can be proven that by simultaneously setting concentric oxygen distribution pipes 53 and rotatable blade-shaped wind vanes 43 in this embodiment, the oxygen injected into the air duct can be evenly diffused and quickly integrated with the circulating flue gas.

[0069] Furthermore, the regulating valve 4 structures disclosed in Embodiments 1 and 2 of this application can be used interchangeably in flue pipes and can achieve oxygen diffusion fusion effects superior to those in the prior art. The following is experimental verification:

[0070] The calculation method for the uniformity of the flow field inside the flue gas distributor is shown in the following formula:

[0071]

[0072] In the formula: γv is the flow field uniformity coefficient, which is [0, 1]. The larger γv is, the better the mixing effect of the mixed gas in the flue gas distributor; Vj and V are the velocity of a certain measurement point in the flue gas distributor and the average velocity of the cross section in the flue gas distributor, respectively, in m / s.

[0073] The verification device is set up according to Embodiments 1 and 2, as follows: Figure 11 As shown, the regulating valve structure disclosed in Example 1 and the regulating valve structure disclosed in Example 2 are alternately distributed in the verification device. B1 is the oxygen replenishment point, where an oxygen distribution pipe 53 is installed, and five detection points (C0, C1, C2, C3, and C4) are set up respectively. After the sintering flue gas and the annular cooling exhaust gas are mixed, the flue gas flow rate is 4000 Nm³ / min; the oxygen content in the mixed flue gas is 17.86%; the supplementary oxygen volume fraction is 99%, and the supplementary oxygen flow rate is 15 Nm³ / min. The flow field uniformity coefficient and flue gas content detected at each detection point are as follows:

[0074] testing point C0 C1 C2 C3 C4 Flow field uniformity coefficient 0.3067 0.4834 0.5472 0.5835 0.6022 Oxygen content in flue gas (%) 17.86 18.12 18.06 18.02 18.01

[0075] In contrast, a verification device is set up according to existing technology (taking Chinese patent CN 105758199 A as an example). Figure 9 As shown, B1 is the oxygen replenishment point, where an oxygen distribution pipe 53 is installed, and five detection points (C0, C1, C2, C3, and C4) are set up. After the sintering flue gas and the annular cooling exhaust gas are mixed, the flue gas flow rate is 4000 Nm³ / min; the oxygen content in the mixed flue gas is 17.86%; the supplementary oxygen volume fraction is 99%, and the supplementary oxygen flow rate is 15 Nm³ / min. The flow field uniformity coefficient and flue gas content detected at each detection point are as follows:

[0076] testing point C0 C1 C2 C3 C4 Flow field uniformity coefficient 0.3067 0.3069 0.3068 0.3066 0.3070 Oxygen content in flue gas (%) 17.86 17.85 17.85 17.87 17.86

[0077] Comparing the two, it can be seen that when the oxygen content in the flue gas at the C0 detection point remains unchanged, the oxygen content in the flue gas measured at the C1-C4 detection points is significantly higher than that of the prior art. Therefore, it can be proved that alternating the regulating valve structure disclosed in Example 1 and the regulating valve structure disclosed in Example 2 in the flue can help the oxygen injected into the air duct to diffuse evenly and quickly merge with the circulating flue gas.

[0078] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A flue gas distributor, characterized in that: It includes a main air duct (1), one or both ends of which are connected to several sections of auxiliary air ducts (2) with a diameter smaller than that of the main air duct (1), and the diameter of the auxiliary air duct (2) closer to the main air duct (1) is larger than the diameter of the auxiliary air duct (2) on the same side away from the main air duct (1); adjacent air ducts are connected by transition pipes (3), and the transition pipes (3) are equipped with regulating valves (4) for controlling the gas flow rate between air ducts. The regulating valve (4) includes an adjusting ring (41), a driving part (42), and a wind plate (43) connected in sequence. The adjusting ring (41) is rotatably sleeved on one end of the transition tube (3). The driving part (42) and the wind plate (43) are built into the transition tube (3). The adjusting ring (41) adjusts the posture of the wind plate (43) by rotating through the driving part (42), thereby changing the opening degree of the regulating valve (4). The drive unit (42) includes a rod (421) connected to the opposite side of the adjusting ring (41). A screw (422) is vertically fixed to the middle of the rod (421). The central axis of the screw (422) coincides with the central axis of the transition tube (3), and one end away from the rod (421) is hinged to a rod (423) whose two ends are fixed on the transition tube (3). A slider (424) is sleeved on the screw (422). The slider (424) is connected to the air plate (43). The rod (421) and the screw (422) are driven to rotate by the adjusting ring (41), which in turn drives the slider (424) to move along the central axis of the transition tube (3), further driving the air plate (43) to adjust its posture to change the opening degree of the regulating valve (4).

2. The flue gas distributor according to claim 1, characterized in that: Several oxygen distribution pipes (53) are installed at intervals along the length of the main air duct (1) and the secondary air duct (2). The oxygen distribution pipes (53) are used to input external oxygen into the main air duct (1) and / or the secondary air duct (2) so that the oxygen content in the air duct is uniformly increased.

3. The flue gas distributor according to claim 2, characterized in that: The opening and closing of each oxygen distribution tube (53) and the oxygen delivery volume are controlled independently.

4. The flue gas distributor according to claim 3, characterized in that: Several oxygen content detectors are installed at intervals inside the main air duct (1) and the secondary air duct (2). Each oxygen content detector corresponds to an oxygen distribution pipe (53) and is connected to it by a signal. The oxygen distribution pipe (53) adjusts its opening and closing and oxygen supply according to the detection value of the oxygen content detector.

5. The flue gas distributor according to any one of claims 1-4, characterized in that: The main air duct (1) and the transition pipe (3) are detachably connected, as are the secondary air duct (2) and the transition pipe (3).

6. The flue gas distributor according to claim 5, characterized in that: The transition tube (3) is configured as a variable cross-section tube.

7. The flue gas distributor according to claim 1, characterized in that: The wind vane (43) includes a plurality of base rods (431) distributed circumferentially along the transition tube (3). A wind deflector (432) is formed on one side of each base rod (431). One end of the base rod (431) is hinged to the inner wall of the transition tube (3), and the other end is hinged to the slider (424) via a connecting rod (433). Under the drive of the slider (424) and the connecting rod (433), the base rod (431) and the wind deflector (432) can be flipped.

8. The flue gas distributor according to claim 7, characterized in that: The free end of the wind deflector (432) is bent toward the central axis of the transition tube (3).

9. The flue gas distributor according to claim 7, characterized in that: Multiple layers of windbreak plates (432) are formed at intervals on the same base rod (431).

10. The flue gas distributor according to claim 1, characterized in that: The air blade (43) is blade-shaped. The air blade (43) is fixed to the slider (424) and perpendicular to the central axis of the transition tube (3). The air blade (43) can follow the slider (424) and move along the central axis of the transition tube (3).

11. The flue gas distributor according to claim 10, characterized in that: The regulating valve (4) also includes an elastic braking mechanism (44) for regulating the rotation speed of the wind vane (43). One end of the elastic braking mechanism (44) is fixedly connected to the drive unit (42), and the other end can abut against the wind vane (43) and generate friction.

12. The flue gas distributor according to claim 11, characterized in that: The main duct (1) and / or the secondary duct (2) are equipped with a support member (5) for preventing duct deformation; the support member (5) includes an outer ring (51) perpendicular to the length of the duct and fitted to the inner wall of the duct, and the outer ring (51) has a plurality of struts (52) formed on the opposite side.

13. The flue gas distributor according to claim 12, characterized in that: An oxygen distribution tube (53) is fixed on the support rod (52).

14. The flue gas distributor according to claim 13, characterized in that: The support rod (52) and the second rod (423) are detachably connected via a positioning rod (54), and the central axis of the positioning rod (54) coincides with the central axis of the transition tube (3).

Images