Sintering system for flue gas uniform heating circulation

Abstract

The utility model discloses a sintering system with smoke uniform heating circulation. The sintering system comprises a sintering trolley, a large flue, a smoke uniform heating mechanism and an airflow cover. The large flue is arranged below the bottom of the sintering pallet and communicated with an air bellow arranged below the sintering pallet through a pipeline. The air flow cover is arranged above the sintering pallet in a covering mode. The flue gas soaking mechanism comprises a flue gas soaking chamber, a heat supplementing pipeline and an oxygen supplementing pipeline. An exhaust port of the large flue is communicated with an air inlet of the flue gas soaking chamber through a first airflow circulating pipeline, and an exhaust port of the flue gas soaking chamber is communicated with an air inlet of the airflow cover through a second airflow circulating pipeline. And the flue gas temperature, the oxygen content and the like of the circulating flue gas are adjusted and controlled in real time through the flue gas soaking mechanism, soaking and homogenizing treatment of the circulating flue gas is achieved, and then the improvement effect of the circulating flue gas on the sintered ore is enhanced. And a rectification pore plate and a rectification fan are arranged in the airflow cover during separation, so that the distribution uniformity of the circulating flue gas flow after uniform heating and homogenizing is enhanced.

Description

Technical Field

[0001] The utility model relates to sintering equipment, in particular to a sintering system with flue gas heat equalization circulation, belonging to the technical field of sintering flue gas circulation. Background Art

[0002] The sintering flue gas circulation process is a sintering method that selectively returns part of the sintering waste gas to the sealed cover on the upper part of the sintering machine trolley after the igniter for recycling. Its main purpose is to recover the sensible heat and latent heat in the sintering waste gas, improve the utilization rate of sintering heat, reduce the fuel ratio, increase the treatment concentration of sulfur dioxide, nitrogen oxides and dust, reduce the waste gas treatment volume of the desulfurization and denitrification system, reduce the fixed investment and operating costs of the purification system, and ultimately achieve energy conservation and emission reduction. Many steel companies at home and abroad have adopted flue gas circulation technology on sintering machines. From the operation of the system, there are three major problems that cannot be ignored in flue gas circulation sintering: (1) The flow field inside the sintering flue gas circulation hood is unevenly distributed, and the flow field of the circulating hot air is unevenly distributed at the material layer. Some material layers do not have circulating hot air passing through, which reduces the hot air absorption of the material surface, and even causes waste gas to accumulate on the side of the hood and cause overflow. (2) Flue gas circulation sintering reduces the O2 content in the gas entering the sintering material surface (usually the O2 content in the circulating flue gas is about 18%). As the O2 content decreases, the quality indicators of the sintered ore decrease. When the O2 content continues to decrease to 15%, the sintering speed decreases sharply and the quality of the sintered ore deteriorates significantly. Therefore, the balance control of oxygen and air volume in the flue gas circulation is one of the key links in the flue gas circulation technology. (3) The circulating flue gas temperature has a great influence on sintering. The circulating flue gas brings in some physical heat, which can reduce the damage of the quenching stress to the finished sintered ore, improve the quality of the middle and upper layers of sintered ore, and increase the sintered ore yield. When the circulating flue gas temperature is too high, the gas expands due to heat, and the gas passing through the material layer is reduced, resulting in the obstruction of fuel combustion and the deterioration of the quality indicators of the sintered ore. The circulating flue gas temperature is generally suitable for 150-180℃. For example, CN115507662A) discloses a method for reasonably distributing circulating flue gas in a flue hood. However, since the flue gas guide plate is a fixed device, the invention cannot adjust the circulating flue gas in real time according to the real-time working conditions. At the same time, due to the introduction of the guide plate, the circulating flue gas cannot enter the sintering material layer smoothly, the circulating flue gas cannot be fully utilized, and the oxygen content and wind temperature of the circulating flue gas cannot be effectively monitored and adjusted.

[0003] Therefore, ensuring that the circulating flue gas entering the sintering material layer is evenly and reasonably distributed and that the oxygen content and wind temperature are effectively controlled during the on-site production process is a key factor in ensuring the effectiveness of the sintering flue gas circulation technology. Utility Model Content

[0004] In view of the existing problems in the sintering flue gas circulation process, such as large fluctuations in circulating flue gas temperature, uneven distribution of circulating flue gas airflow, and low oxygen content in circulating flue gas, the utility model provides a sintering system with flue gas uniform heat circulation, by adding a flue gas uniform heat mechanism in the flue gas circulation process, and by using the flue gas uniform heat mechanism to achieve real-time adjustment and control of the flue gas temperature, oxygen content, etc. of the circulating flue gas, to achieve uniform heat homogenization of the circulating flue gas, thereby enhancing the improvement effect of the circulating flue gas on sintered ore. Furthermore, by setting a partition rectifying orifice plate and a rectifying fan in the airflow hood, the uniformity of the distribution of the circulating flue gas airflow after uniform heat homogenization is enhanced, and the promotion effect of the circulating flue gas on sintered ore is further improved.

[0005] In order to achieve the above technical objectives, the technical solutions adopted by the present utility model are as follows:

[0006] A sintering system with flue gas equalizing circulation, the system comprises a sintering trolley, a large flue, a flue gas equalizing mechanism and an airflow hood. The large flue is arranged below the bottom of the sintering trolley and is connected to a bellows arranged below the sintering trolley through a pipeline. The airflow hood is arranged above the sintering trolley. The flue gas equalizing mechanism comprises a flue gas equalizing chamber, a supplementary heat pipe and an oxygen supply pipe. The exhaust port of the large flue is connected to the air inlet of the flue gas equalizing chamber through a first airflow circulation pipe, and the exhaust port of the flue gas equalizing chamber is connected to the air inlet of the airflow hood through a second airflow circulation pipe. The flue gas equalizing chamber is also provided with a supplementary heat port connected to the supplementary heat pipe and an oxygen supply port connected to the oxygen supply pipe.

[0007] Preferably, a smoke mixer is further provided in the smoke equalizing chamber. The smoke mixer comprises a motor, a rotating shaft, and a grid-type flow equalizer. The motor is arranged inside or outside the smoke equalizing chamber, and the grid-type flow equalizer is arranged inside the smoke equalizing chamber. The motor is connected to the grid-type flow equalizer through a rotating shaft, and the rotating shaft is driven to rotate, thereby driving the grid-type flow equalizer to perform circular motion in the smoke equalizing chamber.

[0008] Preferably, the motor is arranged inside the flue gas equalizing chamber and is arranged at the bottom of the inner cavity of the flue gas equalizing chamber through an annular guide rail. The annular guide rail is an annular wavy guide rail. While the motor drives the rotating shaft to rotate, it also drives itself to perform an undulating circular motion along the annular guide rail.

[0009] Preferably, a first oxygen content detector, a first flue gas temperature detector and a first pipeline control valve are provided in the first air flow circulation pipeline.

[0010] Preferably, a second oxygen content detector, a second flue gas temperature detector and a booster fan are provided in the second air flow circulation duct.

[0011] Preferably, the heat supplement pipe is a hot air pipe, and a third flue gas temperature detector and a second pipe control valve are provided in the heat supplement pipe.

[0012] Preferably, the oxygen supply pipeline is a cold air pipeline or an oxygen-enriched pipeline, and a fourth flue gas temperature detector and a third pipeline control valve are arranged in the oxygen supply pipeline.

[0013] Preferably, a rectifying plate is further provided inside the airflow hood, and the interior of the airflow hood is divided into an upper air inlet chamber and a lower air dispersion chamber by the rectifying plate. An air inlet connected to the second airflow circulation duct is provided on the side or top of the upper air inlet chamber. A row of rectifying holes is evenly provided on the rectifying plate along the width direction of the sintering trolley. Preferably, a rectifying fan is embedded in each rectifying hole.

[0014] Preferably, a plurality of rows of rectifying holes are evenly arranged on the rectifying plate along the running direction of the sintering trolley.

[0015] Preferably, the rectifier fan is a turbofan.

[0016] Preferably, the upper air inlet chamber is a bucket-shaped structure that is wide at the top and narrow at the bottom.

[0017] Preferably, a sealing baffle is further provided between the bottom end of the lower diffuser chamber and both side edges of the sintering trolley (both side edges in the width direction of the trolley).

[0018] Preferably, the large flue includes a head flue and a tail flue. The head flue is connected to the head bellows located below the sintering trolley through a pipeline. The tail flue is connected to the tail bellows located below the sintering trolley through a pipeline. A smoke exhaust pipe is connected to the exhaust port of the head flue. The exhaust port of the tail flue is connected to the air inlet of the smoke homogenizing chamber through the first airflow circulation pipe.

[0019] Preferably, a first exhaust fan is also provided on the first airflow circulation duct.

[0020] Preferably, a second exhaust fan is also provided on the smoke exhaust duct.

[0021] Preferably, the system further comprises a flue gas purification device, and the exhaust port of the head flue is connected to the air inlet of the flue gas purification device through a flue gas dispersing pipe. Preferably, the flue gas purification device is one or more of a dust removal device, a desulfurization device, and a denitrification device.

[0022] In the utility model, in order to solve the problems of large fluctuations in circulating flue gas temperature, uneven distribution of circulating flue gas airflow and low oxygen content in circulating flue gas in the existing sintering flue gas circulation process, the key is to make the circulating flue gas enter the sintering material layer evenly and stably. It is necessary to ensure the stability of the circulating flue gas airflow field and ensure that all parts of the sintering material layer are evenly fed with air. It is also necessary to ensure that the circulating air volume is reasonably matched with the air intake volume of the material surface in each stage of sintering production; at the same time, it is also necessary to ensure that the temperature and oxygen content of the circulating flue gas are within a stable range (temperature 150-200°C, oxygen content 16-18%), so as to achieve the stable and smooth operation of the sintering flue gas circulation process and ensure the optimization of the quality indicators of the sintered minerals. The utility model adds a flue gas equalizing mechanism including a flue gas equalizing chamber, a heat supplement pipe and an oxygen supplement pipe to equalize and homogenize the circulating flue gas, thereby ensuring that the flue gas circulated to the sintering material layer meets the working condition requirements and thus guarantees the quality of the sintering product; further, a partition-type perforated rectifier plate and a matching rectifier fan are arranged in the air flow hood to improve the airflow stability and uniformity of the circulating flue gas after equalization and homogenization, so that the flow field of the circulating hot air is evenly distributed at the material layer, thereby promoting the absorption of hot air on the material surface and avoiding the overflow of hot air on the side of the hood.

[0023] In the utility model, a first oxygen content detector, a first flue gas temperature detector and a first pipeline control valve are arranged in the first airflow circulation pipeline, and a second oxygen content detector and a second flue gas temperature detector are arranged in the second airflow circulation pipeline. The flue gas temperature, oxygen content and the like are detected before and after the flue gas is subjected to the homogenization treatment by the flue gas homogenization mechanism, and the flow rate of the circulating flue gas sent into the flue gas homogenization mechanism is feedback-adjusted according to the detected feedback structure, so as to ensure that the circulating flue gas sent into the sintering material layer meets the working condition requirements.

[0024] In the utility model, the heat supplement pipe is a hot air pipe, and a third flue gas temperature detector and a second pipe control valve are arranged in the heat supplement pipe. The oxygen supplement pipe is a cold air pipe or an oxygen-enriched pipe, and a fourth flue gas temperature detector and a third pipe control valve are arranged in the oxygen supplement pipe. The heat supplement pipe and the oxygen supplement pipe are used to meet the regulation of heat (flue gas temperature) and oxygen content during the flue gas equalization mechanism. The temperature detectors and pipe control valves on the heat supplement pipe and the oxygen supplement pipe are linked with the temperature detectors, pipe control valves and oxygen content detectors in the first air circulation pipe and the second air circulation pipe, so as to adjust the temperature of the circulating flue gas after equalization to 150-200°C and the oxygen content to 16-18%.

[0025] In the present invention, in order to further improve the uniform heating and homogenizing effect of the circulating flue gas, the supplementary hot air and the supplementary oxygen gas in the flue gas uniform heating mechanism, a flue gas mixer is further provided in the flue gas uniform heating mechanism. The flue gas mixer includes a motor, a rotating shaft and a grid-type uniform flow sheet (such as Figure 4As shown, its structure is similar to that of a Venetian blind, except that one end of the Venetian blind is connected to a rotating shaft in the present invention. The motor drives a plurality of grid-type flow-leveling plates arranged on the rotating shaft to rotate through the rotating shaft. During the rotation, the grid holes on the grid-type flow-leveling plates stir the mixed flue gas, thereby improving the mixing uniformity of the circulating flue gas, the heat-supplementing hot air, and the oxygen-supplementing gas. In addition, when necessary, the grid-type flow-leveling plates are movably connected to the rotating shaft through a self-rotating shaft, that is, while the grid-type flow-leveling plates are performing circular motion in a horizontal plane with the rotating shaft as the center, they can also rotate in a vertical direction with their own horizontal axis as the axis. The power of the self-rotating shaft can come from the motor or it can be provided with an independent drive motor.

[0026] Furthermore, the motor is arranged at the bottom of the inner cavity of the flue gas equalizing chamber through an annular wavy guide rail. While the motor drives the rotating shaft to rotate, it also drives itself to perform undulating circular motion along the annular guide rail, so that the grid-type flow-leveling plates work simultaneously in multiple directions (large circumferential direction, local circumferential direction and vertical direction) in the flue gas equalizing mechanism, further quickly promoting the mixing uniformity of the circulating flue gas, heat-supplementing hot air and oxygen-supplementing gas. It should be noted that in the present utility model, the annular wavy guide rail includes but is not limited to annular guide rails, closed triangular annular guide rails and other closed regular or irregular polygonal annular guide rails. It should also be noted that the reciprocating guide rails of one-line, C-shaped or other configurations when not closed should also be regarded as a special annular guide rail in the present utility model and fall within the protection scope of the present utility model.

[0027] In the utility model, the rectifier plate divides the interior of the airflow hood into an upper air intake chamber and a lower air diffusion chamber, wherein the upper air intake chamber is a bucket-shaped structure which is wide at the top and narrow at the bottom. At the same time, a booster fan is also provided on the second airflow circulation duct, and the circulating flue gas after uniform heating and homogenization is transported to the upper air intake chamber by the booster fan, and a positive pressure is formed in the upper air intake chamber. In addition, the design of the booster fan plus the bucket-shaped structure helps to improve the uniformity of the flue gas flow downward to each rectifying hole of the rectifier plate and the rectifying fan inlet (avoiding the flue gas volume at the rectifying holes and the rectifying fan inlet near the circulating flue gas inlet side being too much relative to the flue gas volume at other rectifying holes and the rectifying fan inlet), thereby ensuring that the flue gas volume sprayed downward into each sintering material layer along the vertical direction through the rectifying holes and the rectifying fan is basically consistent.

[0028] In the utility model, a sealing baffle is provided between the bottom end of the lower diffuser chamber and the edge portions of both sides of the sintering table, and the sealing baffle contacts the edge of the sintering trolley, thereby preventing smoke from overflowing.

[0029] In the utility model, the large flue includes a head flue and a tail flue. The head flue is connected to the head bellows located below the sintering trolley through a pipeline. The tail flue is connected to the tail bellows located below the sintering trolley through a pipeline. Since the sintering flue gas circulation has requirements on the flue gas temperature and atmosphere composition, generally not all flue gases from the sintering bellows can meet the circulating flue gas. Generally, the flue gas temperature of the tail bellows at the end of the sintering is relatively high, and the oxygen content is also relatively high. Selectively circulating this part of the flue gas has more practical process value and significance. The division of the head bellows and the tail bellows can be reasonably designed according to the actual working conditions.

[0030] In the present invention, the flue gas purification device is one or more of a dust removal device, a desulfurization device, and a denitrification device. A reasonable selection can be made according to the content and properties of the flue gas pollutants to be discharged, and it is only necessary to ensure that the exhaust gas finally discharged into the environment meets the emission standards.

[0031] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0032] 1: The utility model adds a flue gas equalizing mechanism including a flue gas equalizing chamber, a heat supply pipe and an oxygen supply pipe to equalize and homogenize the circulating flue gas, thereby ensuring that the flue gas circulated to the sintering material layer meets the working condition requirements, thereby ensuring the quality of the sintering product.

[0033] 2: The utility model also arranges a partition-type perforated rectifier plate and a matching rectifier fan in the airflow hood, thereby improving the airflow stability and uniformity of the circulating flue gas after equalization and homogenization, so that the flow field of the circulating hot air is evenly distributed at the material layer, promoting the absorption of hot air on the material surface, and avoiding the overflow of hot air on the side of the hood.

[0034] 3: The sintering system of the flue gas equalizing cycle of the utility model has a simple structure, convenient operation, good flue gas equalizing effect, strong stability and uniformity of the flue gas airflow absorbed by the sintering material layer, good economic and energy-saving emission reduction effects, and is conducive to large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the lateral structure of the sintering system of the utility model.

[0036] Figure 2 This is a schematic diagram of the forward structure of the sintering system of the utility model.

[0037] Figure 3 It is a partial schematic diagram of the sintering system of the utility model.

[0038] Figure 4 It is a structural schematic diagram of the grid-type flow-uniform plate described in the utility model.

[0039] Reference numerals: 1: sintering trolley; 2: large flue; 201: head flue; 202: tail flue; 203: flue gas exhaust pipe; 3: flue gas equalizing mechanism; 301: flue gas equalizing chamber; 302: supplementary heat pipe; 303: supplementary oxygen pipe; 304: third flue gas temperature detector; 305: second pipeline control valve; 306: fourth flue gas temperature detector; 307: third pipeline control valve; 4: airflow hood; 401: rectifier plate; 402: rectifier hole; 403: rectifier fan; 404: Sealing baffle; 5: first air flow circulation duct; 501: first oxygen content detector; 502: first flue gas temperature detector; 503: first pipeline control valve; 6: second air flow circulation duct; 601: second oxygen content detector; 602: second flue gas temperature detector; 603: booster fan; 7: flue gas mixer; 701: motor; 702: rotating shaft; 703: grid-type flow-uniformizing plate; 704: annular guide rail; 8: first exhaust fan; 9: second exhaust fan; 10: flue gas purification device. DETAILED DESCRIPTION

[0040] The technical solution of the utility model is illustrated below, and the scope of protection requested for the utility model includes but is not limited to the following embodiments.

[0041] A sintering system with flue gas equalizing circulation, the system comprises a sintering trolley 1, a large flue 2, a flue gas equalizing mechanism 3 and an airflow hood 4. The large flue 2 is arranged below the bottom of the sintering trolley 1, and is connected to the wind box arranged below the sintering trolley 1 through a pipeline. The airflow hood 4 is arranged above the sintering trolley 1. The flue gas equalizing mechanism 3 comprises a flue gas equalizing chamber 301, a supplementary heat pipe 302 and an oxygen supply pipe 303. The exhaust port of the large flue 2 is connected to the air inlet of the flue gas equalizing chamber 301 through a first airflow circulation pipe 5, and the exhaust port of the flue gas equalizing chamber 301 is connected to the air inlet of the airflow hood 4 through a second airflow circulation pipe 6. The flue gas equalizing chamber 301 is also provided with a supplementary heat port connected to the supplementary heat pipe 302 and an oxygen supply port connected to the oxygen supply pipe 303.

[0042] Preferably, a smoke mixer 7 is further provided in the smoke equalizing chamber 301. The smoke mixer 7 includes a motor 701, a rotating shaft 702, and a grid-type flow equalizer 703. The motor 701 is provided inside or outside the smoke equalizing chamber 301, and the grid-type flow equalizer 703 is provided inside the smoke equalizing chamber 301. The motor 701 is connected to the grid-type flow equalizer 703 through the rotating shaft 702, and the rotating shaft 702 is driven to rotate, thereby driving the grid-type flow equalizer 703 to perform circular motion in the smoke equalizing chamber 301.

[0043] Preferably, the motor 701 is arranged inside the flue gas equalizing chamber 301, and is arranged at the bottom of the inner cavity of the flue gas equalizing chamber 301 through the annular guide rail 704. The annular guide rail 704 is an annular wavy guide rail. The motor 701 drives the rotating shaft 702 to rotate and also drives itself to perform undulating circular motion along the annular guide rail 704.

[0044] Preferably, a first oxygen content detector 501 , a first flue gas temperature detector 502 and a first pipeline control valve 503 are provided in the first airflow circulation pipeline 5 .

[0045] Preferably, a second oxygen content detector 601 , a second flue gas temperature detector 602 and a booster fan 603 are provided in the second airflow circulation duct 6 .

[0046] Preferably, the heat supplement pipe 302 is a hot air pipe, and a third flue gas temperature detector 304 and a second pipe control valve 305 are provided in the heat supplement pipe 302 .

[0047] Preferably, the oxygen supply pipeline 303 is a cold air pipeline or an oxygen-enriched pipeline, and a fourth flue gas temperature detector 306 and a third pipeline control valve 307 are arranged in the oxygen supply pipeline 303 .

[0048] Preferably, a rectifying plate 401 is further provided inside the airflow hood 4, and the interior of the airflow hood 4 is divided into an upper air intake chamber and a lower air dispersion chamber by the rectifying plate 401. An air inlet connected to the second airflow circulation duct 6 is provided on the side or top of the upper air intake chamber. A row of rectifying holes 402 are evenly provided on the rectifying plate 401 along the width direction of the sintering trolley 1. Preferably, a rectifying fan 403 is embedded in each rectifying hole 402.

[0049] Preferably, a plurality of rows of rectifying holes 402 are evenly formed on the rectifying plate 401 along the running direction of the sintering trolley 1 .

[0050] Preferably, the rectifier fan 403 is a turbo fan.

[0051] Preferably, the upper air inlet chamber is a bucket-shaped structure that is wide at the top and narrow at the bottom.

[0052] Preferably, a sealing baffle 404 is further provided between the bottom end of the lower diffuser chamber and the side edges of the sintering trolley 1 .

[0053] Preferably, the large flue 2 includes a head flue 201 and a tail flue 202. The head flue 201 is connected to the head bellows located below the sintering trolley 1 through a pipeline. The tail flue 202 is connected to the tail bellows located below the sintering trolley 1 through a pipeline. A flue gas dispersing pipe 203 is connected to the exhaust port of the head flue 201. The exhaust port of the tail flue 202 is connected to the air inlet of the flue gas equalizing chamber 301 through the first airflow circulation pipe 5.

[0054] Preferably, a first exhaust fan 8 is further provided on the first airflow circulation duct 5 .

[0055] Preferably, a second exhaust fan 9 is also provided on the smoke exhaust duct 203 .

[0056] Preferably, the system further comprises a flue gas purification device 10, and the exhaust port of the head flue 201 is connected to the air inlet of the flue gas purification device 10 through a flue gas dispersing pipe 203. Preferably, the flue gas purification device 10 is one or more of a dust removal device, a desulfurization device, and a denitrification device.

[0057] Example 1

[0058] like Figure 1-4 As shown, a sintering system with flue gas equalizing circulation includes a sintering trolley 1, a large flue 2, a flue gas equalizing mechanism 3 and an airflow hood 4. The large flue 2 is arranged below the bottom of the sintering trolley 1 and is connected to the wind box arranged below the sintering trolley 1 through a pipeline. The airflow hood 4 is arranged above the sintering trolley 1. The flue gas equalizing mechanism 3 includes a flue gas equalizing chamber 301, a heat supplement pipe 302 and an oxygen supplement pipe 303. The exhaust port of the large flue 2 is connected to the air inlet of the flue gas equalizing chamber 301 through the first airflow circulation pipe 5, and the exhaust port of the flue gas equalizing chamber 301 is connected to the air inlet of the airflow hood 4 through the second airflow circulation pipe 6. The flue gas equalizing chamber 301 is also provided with a heat supplement port connected to the heat supplement pipe 302 and an oxygen supplement port connected to the oxygen supplement pipe 303.

[0059] Example 2

[0060] Example 1 is repeated, except that a smoke mixer 7 is further provided in the smoke equalizing chamber 301. The smoke mixer 7 includes a motor 701, a rotating shaft 702, and a grid-type flow equalizer 703. The motor 701 is provided inside the smoke equalizing chamber 301, and the grid-type flow equalizer 703 is provided inside the smoke equalizing chamber 301. The motor 701 is connected to the grid-type flow equalizer 703 through the rotating shaft 702, and the rotating shaft 702 is driven to rotate, thereby driving the grid-type flow equalizer 703 to perform circular motion in the smoke equalizing chamber 301.

[0061] Example 3

[0062] Example 2 is repeated, except that the motor 701 is arranged inside the flue gas equalizing chamber 301, and is arranged at the bottom of the inner cavity of the flue gas equalizing chamber 301 through the annular guide rail 704. The annular guide rail 704 is an annular wavy guide rail. The motor 701 drives the rotating shaft 702 to rotate and also drives itself to perform undulating circular motion along the annular guide rail 704.

[0063] Example 4

[0064] Example 3 is repeated, except that a first oxygen content detector 501 , a first flue gas temperature detector 502 and a first pipeline control valve 503 are provided in the first air flow circulation pipeline 5 .

[0065] Example 5

[0066] Example 4 is repeated, except that a second oxygen content detector 601 , a second flue gas temperature detector 602 and a booster fan 603 are provided in the second airflow circulation duct 6 .

[0067] Example 6

[0068] Example 5 is repeated, except that the heat supplement pipe 302 is a hot air pipe, and a third flue gas temperature detector 304 and a second pipe control valve 305 are provided in the heat supplement pipe 302 .

[0069] Example 7

[0070] Example 6 is repeated, except that the oxygen supply pipeline 303 is a cold air pipeline, and a fourth flue gas temperature detector 306 and a third pipeline control valve 307 are provided in the oxygen supply pipeline 303 .

[0071] Example 8

[0072] Example 6 is repeated, except that the oxygen supply pipe 303 is an oxygen-enriched pipe.

[0073] Example 9

[0074] Example 7 is repeated, except that a rectifying plate 401 is further provided inside the airflow hood 4, and the inside of the airflow hood 4 is divided into an upper air intake chamber and a lower air diffusion chamber by the rectifying plate 401. An air intake port connected to the second airflow circulation duct 6 is provided on the side of the upper air intake chamber. A row of rectifying holes 402 is evenly provided on the rectifying plate 401 along the width direction of the sintering trolley 1.

[0075] Example 10

[0076] Example 9 is repeated, except that a rectifying fan 403 is embedded in each rectifying hole 402 .

[0077] Embodiment 11

[0078] Example 10 is repeated, except that a plurality of rows of rectifying holes 402 are evenly opened on the rectifying plate 401 along the running direction of the sintering trolley 1 .

[0079] Example 12

[0080] Example 11 is repeated, except that the rectifier fan 403 is a turbo fan.

[0081] Example 13

[0082] Repeat Example 12, except that the upper air inlet chamber is a bucket-shaped structure that is wide at the top and narrow at the bottom.

[0083] Embodiment 14

[0084] Example 13 is repeated, except that a sealing baffle 404 is further provided between the bottom end of the lower diffuser chamber and the side edges of the sintering trolley 1 .

[0085] Embodiment 15

[0086] Example 14 is repeated, except that the large flue 2 includes a head flue 201 and a tail flue 202. The head flue 201 is connected to the head wind box located below the sintering trolley 1 through a pipeline. The tail flue 202 is connected to the tail wind box located below the sintering trolley 1 through a pipeline. A flue gas dispersing pipe 203 is connected to the exhaust port of the head flue 201. The exhaust port of the tail flue 202 is connected to the air inlet of the flue gas equalizing chamber 301 through the first airflow circulation pipe 5.

[0087] Example 16

[0088] Example 15 is repeated, except that a first exhaust fan 8 is further provided on the first air circulation duct 5.

[0089] Embodiment 17

[0090] Example 16 is repeated, except that a second exhaust fan 9 is further provided on the smoke exhaust duct 203 .

[0091] Embodiment 18

[0092] Example 17 is repeated, except that the system further includes a flue gas purification device 10 , and the exhaust port of the head flue 201 is connected to the air inlet of the flue gas purification device 10 through a flue gas exhaust pipe 203 .

[0093] Embodiment 19

[0094] Example 18 is repeated, except that the flue gas purification device 10 is a series combination of a dust removal device, a desulfurization device, and a denitrification device.

Claims

1. A sintering system with flue gas heat equalization circulation, characterized in that: The system comprises a sintering trolley (1), a large flue (2), a flue gas equalizing mechanism (3) and an airflow hood (4); the large flue (2) is arranged below the bottom of the sintering trolley (1) and is connected to a wind box arranged below the sintering trolley (1) through a pipeline; the airflow hood (4) is arranged above the sintering trolley (1); the flue gas equalizing mechanism (3) comprises a flue gas equalizing chamber (301), a heat supplementation pipeline (302) and an oxygen supplementation pipeline (303); the exhaust port of the large flue (2) is connected to the air inlet of the flue gas equalizing chamber (301) through a first airflow circulation pipeline (5), and the exhaust port of the flue gas equalizing chamber (301) is connected to the air inlet of the airflow hood (4) through a second airflow circulation pipeline (6); the flue gas equalizing chamber (301) is also provided with a heat supplementation port connected to the heat supplementation pipeline (302) and an oxygen supplementation port connected to the oxygen supplementation pipeline (303).

2. The system according to claim 1, characterized in that: A smoke mixer (7) is also provided in the smoke homogenizing chamber (301); the smoke mixer (7) comprises a motor (701), a rotating shaft (702), and a grid-type flow-leveling plate (703); the motor (701) is provided inside or outside the smoke homogenizing chamber (301), and the grid-type flow-leveling plate (703) is provided inside the smoke homogenizing chamber (301); the motor (701) is connected to the grid-type flow-leveling plate (703) via the rotating shaft (702), and the rotating shaft (702) is driven to rotate, thereby driving the grid-type flow-leveling plate (703) to perform circular motion in the smoke homogenizing chamber (301).

3. The system according to claim 2, characterized in that: The motor (701) is arranged inside the flue gas equalizing chamber (301) and is arranged at the bottom of the inner cavity of the flue gas equalizing chamber (301) through an annular guide rail (704); the annular guide rail (704) is an annular wavy guide rail; while the motor (701) drives the rotating shaft (702) to rotate, it also drives itself to perform an undulating circular motion along the annular guide rail (704).

4. The system according to any one of claims 1 to 3, characterized in that: A first oxygen content detector (501), a first flue gas temperature detector (502) and a first pipeline control valve (503) are arranged in the first airflow circulation pipeline (5); and / or A second oxygen content detector (601), a second flue gas temperature detector (602) and a booster fan (603) are arranged in the second airflow circulation duct (6).

5. The system according to any one of claims 1 to 3, characterized in that: The heat supplement pipeline (302) is a hot air pipeline, and a third flue gas temperature detector (304) and a second pipeline control valve (305) are arranged in the heat supplement pipeline (302); and / or The oxygen supply pipeline (303) is a cold air pipeline or an oxygen-enriched pipeline. A fourth flue gas temperature detector (306) and a third pipeline control valve (307) are arranged in the oxygen supply pipeline (303).

6. The system according to any one of claims 1 to 3, characterized in that: A rectifying plate (401) is also provided inside the airflow hood (4), and the interior of the airflow hood (4) is divided into an upper air intake chamber and a lower air diffusion chamber by the rectifying plate (401); an air intake port connected to the second airflow circulation duct (6) is provided on the side or top of the upper air intake chamber; and a row of rectifying holes (402) is evenly provided on the rectifying plate (401) along the width direction of the sintering trolley (1).

7. The system according to claim 6, characterized in that: A rectifying fan (403) is embedded in each rectifying hole (402).

8. The system according to claim 7, characterized in that: A plurality of rows of rectifying holes (402) are evenly provided on the rectifying plate (401) along the running direction of the sintering trolley (1); and / or The rectifying fan (403) is a turbo fan.

9. The system according to claim 6, characterized in that: The upper air inlet chamber is a bucket-shaped structure that is wide at the top and narrow at the bottom; and / or A sealing baffle (404) is also provided between the bottom end of the lower diffuser chamber and the edges of both sides of the sintering trolley (1).

10. The system according to claim 7 or 8, characterized in that: The upper air inlet chamber is a bucket-shaped structure that is wide at the top and narrow at the bottom; and / or A sealing baffle (404) is also provided between the bottom end of the lower diffuser chamber and the edges of both sides of the sintering trolley (1).

11. The system according to any one of claims 1-3, 7-9, characterized in that: The large flue (2) comprises a head flue (201) and a tail flue (202); the head flue (201) is connected to a head bellows located below the sintering trolley (1) through a pipeline; the tail flue (202) is connected to a tail bellows located below the sintering trolley (1) through a pipeline; the exhaust port of the head flue (201) is connected to a smoke exhaust pipe (203); the exhaust port of the tail flue (202) is connected to an air inlet of a smoke homogenizing chamber (301) through a first airflow circulation pipe (5).

12. The system according to claim 4, characterized in that: The large flue (2) comprises a head flue (201) and a tail flue (202); the head flue (201) is connected to a head bellows located below the sintering trolley (1) through a pipeline; the tail flue (202) is connected to a tail bellows located below the sintering trolley (1) through a pipeline; the exhaust port of the head flue (201) is connected to a smoke exhaust pipe (203); the exhaust port of the tail flue (202) is connected to an air inlet of a smoke homogenizing chamber (301) through a first airflow circulation pipe (5).

13. The system according to claim 5, characterized in that: The large flue (2) comprises a head flue (201) and a tail flue (202); the head flue (201) is connected to a head bellows located below the sintering trolley (1) through a pipeline; the tail flue (202) is connected to a tail bellows located below the sintering trolley (1) through a pipeline; the exhaust port of the head flue (201) is connected to a smoke exhaust pipe (203); the exhaust port of the tail flue (202) is connected to an air inlet of a smoke homogenizing chamber (301) through a first airflow circulation pipe (5).

14. The system according to claim 6, characterized in that: The large flue (2) comprises a head flue (201) and a tail flue (202); the head flue (201) is connected to a head bellows located below the sintering trolley (1) through a pipeline; the tail flue (202) is connected to a tail bellows located below the sintering trolley (1) through a pipeline; the exhaust port of the head flue (201) is connected to a smoke exhaust pipe (203); the exhaust port of the tail flue (202) is connected to an air inlet of a smoke homogenizing chamber (301) through a first airflow circulation pipe (5).

15. The system according to claim 11, characterized in that: A first exhaust fan (8) is also provided on the first air circulation duct (5); and / or A second exhaust fan (9) is also provided on the smoke exhaust duct (203).

16. The system according to any one of claims 12 to 14, characterized in that: A first exhaust fan (8) is also provided on the first air circulation duct (5); and / or A second exhaust fan (9) is also provided on the smoke exhaust duct (203).

17. The system according to claim 11, characterized in that: The system also includes a flue gas purification device (10), and the exhaust port of the head flue (201) is connected to the air inlet of the flue gas purification device (10) through a flue gas exhaust pipe (203).

18. The system according to any one of claims 12 to 15, characterized in that: The system also includes a flue gas purification device (10), and the exhaust port of the head flue (201) is connected to the air inlet of the flue gas purification device (10) through a flue gas exhaust pipe (203).

19. The system according to claim 17, characterized in that: The flue gas purification device (10) is one or more of a dust removal device, a desulfurization device, and a denitrification device.

20. The system according to claim 18, characterized in that: The flue gas purification device (10) is one or more of a dust removal device, a desulfurization device, and a denitrification device.

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