A safe sintering machine head flue gas bag dust removal system and method

Abstract

The present invention discloses a safe sintering machine head flue gas bag dust removal system and method, comprising a sintering device, a first flue gas collecting and processing device, a second flue gas collecting and processing device, a third flue gas collecting and processing device, a mixing and denitrification device, a waste heat treatment device, and a smoke exhaust mechanism. The first flue gas collecting and processing device is used to collect the flue gas discharged from the head bellows mechanism and introduce it into the mixing and denitrification device. The second flue gas collecting and processing device is used to collect the flue gas discharged from the middle bellows mechanism and / or the mixing and denitrification device and introduce it into the smoke exhaust mechanism after treatment. The third flue gas collecting and processing device is used to collect the flue gas discharged from the tail bellows mechanism and introduce it into the mixing and denitrification device after combustion treatment. The safe sintering machine head flue gas bag dust removal system of the present invention avoids the technical problems of existing sintering machine head bag dust removal systems, such as the bags being easily burned through by sparks in the flue gas and the safety issues.

Description

Technical Field

[0001] The present invention relates to the technical field of sintering machines, and in particular to a safe sintering machine head fume bag type dust removal system and method. Background Art

[0002] Sintering is a fundamental process in the steel industry, providing high-quality raw materials for ironmaking. The sintering process involves batching, mixing, and granulating iron-containing raw materials before distributing them onto a sintering trolley. Finally, the sintering machine, while operating at a constant speed, sinters at high temperatures (≤1400°C) under the influence of ventilation. This process causes a series of physical and chemical changes in the material, which, after crushing, produces a porous, strong, and sintered ore product.

[0003] Sintering, the main process in ironmaking, accounts for 20% of the total pollutant emissions from the steel industry. Sintering machine head flue gas is characterized by large flue gas volume, high temperature, high corrosion, easy condensation, high negative pressure, and flue gas operating conditions, making it difficult to control. Traditionally, electrostatic precipitators (ESPs) have been used for sintering machine head flue gas purification both domestically and internationally. However, due to their unstable dust removal efficiency, the outlet particulate matter concentration exceeds the standard (ranging from 50mg / m3 to 150mg / m3), seriously affecting the stable compliance of subsequent desulfurization and denitrification systems. This has become a bottleneck restricting the ultra-low emissions of the sintering process and needs to be solved urgently. Bag dust collectors can efficiently remove fine particulate matter, with an outlet particulate matter concentration of less than 10mg / m3. Using bag dust collectors to purify sintering machine head flue gas can achieve stable ultra-low emissions of sintering machine head flue gas.

[0004] In the prior art, the bag-type dust removal system used in the sintering machine head has the problem that the bags are easily burned through by sparks in the flue gas. Summary of the Invention

[0005] The safe sintering machine head flue gas bag dust removal system and method provided by the present invention solves the problem that the bags of the existing sintering machine head using bag dust removal systems are easily burned through by sparks in the flue gas.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A safe sintering machine head flue gas bag dust removal system, including a sintering device, a first flue gas collection and treatment device, a second flue gas collection and treatment device, a third flue gas collection and treatment device, a mixing and denitrification device, a waste heat treatment device and a smoke exhaust mechanism. The sintering device includes a sintering machine, a head bellows mechanism arranged near the head of the sintering machine, a tail bellows mechanism arranged near the tail of the sintering machine, and a middle bellows mechanism located between the head bellows mechanism and the tail bellows mechanism. The head bellows mechanism, the middle bellows mechanism and the tail bellows mechanism are all located below the sintering machine. The first flue gas collection and treatment device is used to collect the flue gas discharged by the head bellows mechanism and introduce it into the flue gas collector. to the mixing and denitrification device, the second flue gas collecting and processing device is used to collect the flue gas discharged by the middle bellows mechanism and / or the mixing and denitrification device and introduce it into the exhaust mechanism after treatment, the third flue gas collecting and processing device is used to collect the flue gas discharged by the tail bellows mechanism and introduce it into the mixing and denitrification device after combustion treatment, the mixing and denitrification device is used to receive the flue gas discharged by the first flue gas collecting and processing device and discharge it to the second flue gas collecting and processing device and / or the waste heat treatment device after treatment, the mixing and denitrification device is used to receive the flue gas discharged by the third flue gas collecting and processing device and discharge it to the second flue gas collecting and processing device and / or the waste heat treatment device after treatment.

[0008] Furthermore, the air inlet end of the first flue gas collecting and treating device is connected to the exhaust end of the head bellows mechanism, the air outlet end of the first flue gas collecting and treating device is connected to the first air inlet end of the mixing and denitrification device, the first air inlet end of the second flue gas collecting and treating device is connected to the exhaust end of the middle bellows mechanism, the air outlet port of the second flue gas collecting and treating device is connected to the smoke exhaust mechanism, the air inlet end of the third flue gas collecting and treating device is connected to the exhaust end of the tail bellows mechanism, the air outlet end of the second flue gas collecting and treating device is connected to the second air inlet end of the mixing and denitrification device, the first exhaust end of the mixing and denitrification device is connected to the air inlet end of the waste heat treatment device, the second exhaust end of the mixing and denitrification device is connected to the second air inlet end of the second flue gas collecting and treating device, and the exhaust end of the waste heat treatment device is connected to the smoke exhaust mechanism.

[0009] Furthermore, a first waste heat utilization regulating valve is provided between the first exhaust end of the mixing denitrification device and the waste heat treatment device, and a second waste heat utilization regulating valve is provided between the second exhaust end of the mixing denitrification device and the second flue gas collection and treatment device.

[0010] Furthermore, the second flue gas collection and treatment device includes a second flue gas pipe mechanism, a second flue and an exhaust treatment mechanism. The first input end of the second flue gas duct is connected to the exhaust end of the middle bellows mechanism through the second flue gas pipe mechanism. A second waste heat utilization regulating valve is provided between the second input end of the second flue gas duct and the mixing and denitrification device. The output end of the second flue gas duct is connected to the smoke exhaust mechanism through the exhaust treatment mechanism. An alkali ash spraying mechanism and a first flue gas diversion agitator are provided in sequence at the outlet position of the second flue gas duct.

[0011] Furthermore, the alkali ash powder spraying mechanism includes an alkali ash bin and an ash spraying nozzle. The ash spraying nozzle is arranged in the second flue and close to the outlet of the second flue. The alkali ash bin is arranged outside the second flue and is connected to the ash spraying nozzle. The first flue gas diversion agitator is arranged on the second flue and downstream of the ash spraying nozzle.

[0012] Furthermore, the exhaust treatment mechanism includes a pre-sedimentation chamber, a bag dust collector, a flue gas purifier, and a second induced draft fan, which are located downstream of the second flue and arranged in sequence and interconnected. The inner cavity of the pre-sedimentation chamber is respectively provided with a second flue gas diversion agitator and a second temperature detector. The second flue, the pre-sedimentation chamber, the bag dust collector, the flue gas purifier, the second induced draft fan and the smoke exhaust mechanism are connected through an exhaust duct, and the second induced draft fan is arranged between the flue gas purifier and the smoke exhaust mechanism.

[0013] Furthermore, the third flue gas collection and treatment device includes a third flue pipe mechanism, a third flue, a combustion chamber and a third induced draft fan. The input end of the third flue is connected to the exhaust end of the tail bellows mechanism through the third flue pipe mechanism, the output end of the third flue is connected to the combustion chamber, and the combustion chamber is connected to the air inlet end of the mixing and denitrification device through the third induced draft fan. A combustion burner is provided in the combustion chamber, and the combustion burner is connected to the gas inlet pipe. A gas regulating valve is provided on the gas inlet pipe.

[0014] Furthermore, the tail bellows mechanism includes a plurality of tail sintering bellows arranged in sequence, and the safe sintering machine head flue gas bag dust removal system also includes a flue gas guiding device, which includes a three-way control mechanism. The three-way control mechanism has a total inlet, a first outlet and a second outlet. The total inlet of the three-way control mechanism is used to connect with the tail sintering bellows close to the side of the middle bellows mechanism, the first outlet is used to connect with the second flue gas collecting and processing device, and the second outlet is used to connect with the third flue gas collecting and processing device. The flue gas guiding device is used to discharge the flue gas from the tail sintering bellows close to the side of the middle bellows mechanism into the second flue gas collecting and processing device or the third flue gas collecting and processing device.

[0015] Furthermore, the mixing and denitrification device includes a mixing chamber and a denitrification reaction chamber arranged in sequence, the mixing chamber is provided with an ammonia inlet pipe, and the denitrification reaction chamber is provided with a first temperature detector.

[0016] The present invention also provides a safe bag dust removal method for sintering machine head flue gas, comprising the following steps: before the initial sintering trolley on the sintering machine runs to the tail bellows mechanism: obtaining the first flue gas temperature of the first flue gas in the mixing and denitrification device, if the first flue gas temperature is lower than the first preset temperature, starting the combustion chamber of the third flue gas collecting and processing device to perform combustion work to generate high-temperature flue gas, and allowing the high-temperature flue gas to enter the mixing and denitrification device until the first flue gas temperature reaches the first preset temperature, and the mixing and denitrification device works to remove nitrogen oxides in the first flue gas; obtaining the second flue gas temperature of the second flue gas in the pre-sedimentation chamber of the second flue gas collecting and processing device, if the second flue gas temperature is lower than the second preset flue temperature, starting the combustion chamber of the third flue gas collecting and processing device to perform combustion work to generate high-temperature flue gas, the high-temperature flue gas is discharged into the second flue gas collecting and processing device after being processed in the mixing and denitrification device, thereby increasing the flue gas temperature of the second flue gas collecting and processing device, and causing the alkali ash spraying mechanism of the second flue gas collecting and processing device to work to adjust the flue gas alkalinity; the initial sintering on the sintering machine When the trolley runs to the rear bellows mechanism: combustion work is performed through the combustion chamber of the third flue gas collecting and treating device to remove sparks discharged from the rear bellows mechanism, and high-temperature flue gas is generated to enter the mixing and denitrification device; the first flue gas temperature of the first flue gas in the mixing and denitrification device is obtained. If the first flue gas temperature is lower than the first preset temperature, the combustion chamber of the third flue gas collecting and treating device is started to perform combustion work to generate high-temperature flue gas, and the high-temperature flue gas is allowed to enter the mixing and denitrification device until the first flue gas temperature reaches the first preset temperature, and the mixing and denitrification device works to remove nitrogen oxides in the first flue gas; the second flue gas temperature of the second flue gas in the pre-sedimentation chamber of the second flue gas collecting and treating device is obtained. If the second flue gas temperature is lower than the second preset flue gas temperature, the combustion chamber of the third flue gas collecting and treating device is started to perform combustion work to generate high-temperature flue gas. After the high-temperature flue gas is treated in the mixing and denitrification device, it is discharged into the second flue gas collecting and treating device, thereby increasing the flue gas temperature of the second flue gas collecting and treating device, and the alkali ash spraying mechanism of the second flue gas collecting and treating device is operated to adjust the alkalinity of the flue gas.

[0017] The present invention has the following beneficial effects:

[0018] The safe sintering machine head flue gas bag dust removal system and method of the present invention includes a sintering device, a first flue gas collecting and treating device, a second flue gas collecting and treating device, a third flue gas collecting and treating device, a mixing and denitrification device, a waste heat treatment device and a smoke exhaust mechanism. The first flue gas collecting and treating device is used to collect the flue gas discharged by the head bellows mechanism and introduce it into the mixing and denitrification device, the second flue gas collecting and treating device is used to collect the flue gas discharged by the middle bellows mechanism and / or the mixing and denitrification device and introduce it into the main chimney, and the third flue gas collecting and treating device is used to collect the flue gas discharged by the tail bellows mechanism and introduce it into the mixing and denitrification device after combustion treatment. The scheme of the present invention fully considers various characteristics of the sintering process of the sintering machine. Since the concentration of nitrogen compounds in the flue gas upstream of the second flue gas collecting and treating device is the highest during the sintering process of the sintering machine, the concentration of nitrogen compounds in the flue gas upstream of the first flue gas collecting and treating device is the second, and the concentration of nitrogen compounds in the flue gas upstream of the third flue gas collecting and treating device is the lowest, the concentration of nitrogen oxides in the flue gas upstream of the first flue gas collecting and treating device and the third flue gas collecting and treating device are relatively lower than that of the second flue gas collecting and treating device. The collection and treatment device is lower; a simple SCR denitrification can meet the emission standards; the flue gas discharged from the head bellows mechanism is sent to the mixing denitrification device for treatment, and then sent to the second flue gas collection and treatment device for secondary treatment and discharge, or sent to the waste heat treatment device for waste heat recovery and treatment and then discharged, which is beneficial to reduce the emission of nitrogen compounds; the flue gas discharged from the tail bellows mechanism is treated separately by the third flue gas collection and treatment device. Since the combustion zone at the tail position of the sintering machine moves to the lowest layer, the carbon in the material layer may not be completely burned out after ignition. The smoke enters the tail bellows mechanism under the action of exhaust, so the smoke discharged from the tail bellows mechanism may contain sparks. By setting up a combustion chamber, the smoke discharged from the tail bellows mechanism is burned again to facilitate the removal of sparks, thereby avoiding the technical problem of the existing sintering machine head using a bag-type dust removal system that the bag is easily burned through by sparks in the smoke and there is a safety problem; at the same time, the smoke discharged from various positions of the sintering machine is synchronously treated by the first smoke collecting and treating device, the second smoke collecting and treating device, and the third smoke collecting and treating device, and the smoke treatment efficiency is high.

[0019] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of this application, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0021] In the attached figure:

[0022] Figure 1This is a schematic diagram of the system structure of the existing sintering machine head bag dust removal system;

[0023] Figure 2 1. It is a schematic diagram of the system structure of a safe sintering machine head flue gas bag type dust removal system in one embodiment of the present invention;

[0024] Figure 3 yes Figure 2 Schematic diagram of the specific structure of the sintering machine head flue gas bag dust removal system.

[0025] Description of Figure Numbers:

[0026] 100. Safe sintering machine head flue gas bag dust removal system; 10. Sintering device; 11. Sintering machine;

[0027] 12. Head bellows mechanism; 13. Middle bellows mechanism; 20. First flue gas collecting and processing device; 21. First flue gas pipe mechanism; 22. First flue gas duct; 23. First induced draft fan; 30. Second flue gas collecting and processing device; 31. Second flue gas pipe mechanism; 32. Second flue gas duct; 321. Alkali ash spraying mechanism; 322. First flue gas flow guide agitator; 33. Exhaust treatment mechanism; 331. Pre-settling chamber; 332. Bag filter; 333. Flue gas purifier; 334. Second induced draft fan; 335. Second flue gas flow guide agitator; 336. Second temperature detector; 40. Third flue gas collecting and processing device; 31. Second flue gas pipe mechanism; 32. Second flue gas duct; 321. Alkali ash spraying mechanism; 322. First flue gas flow guide agitator; 33. Exhaust gas treatment mechanism; 331. Pre-settling chamber; 332. Bag filter; 333. Flue gas purifier; 334. Second induced draft fan; 335. Second flue gas flow guide agitator; 336. Second temperature detector; 40. Third flue gas collecting and processing device; Collective treatment device; 41. Third flue gas pipe mechanism; 42. Third flue; 43. Combustion chamber; 44. Third induced draft fan; 45. Combustion burner; 46. Gas inlet pipe; 47. Gas regulating valve; 50. Mixing and denitrification device; 51. Mixing chamber; 52. Denitrification reaction chamber; 53. First temperature detector; 54. Ammonia inlet pipe; 60. Waste heat treatment device; 61. Waste heat boiler; 62. Dust collector; 63. Waste heat induced draft fan; 70. Smoke exhaust mechanism; 71. Main chimney; 72. Auxiliary chimney; 81. First waste heat utilization regulating valve; 82. Second waste heat utilization regulating valve; 90. Smoke guiding device. DETAILED DESCRIPTION

[0028] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] Please refer to Figure 1 In the existing sintering machine head flue gas bag dust removal system, the flue gas in the sintering machine bellows is collected into the large flue under the action of the exhaust fan, and then passes through the bag dust collector for dust removal, the flue gas desulfurization device for desulfurization, and the flue gas denitrification device for denitrification before being discharged through the chimney.

[0033] Through research, it was found that the existing sintering machine head flue gas bag dust removal system mainly has the following technical problems: 1. When the existing sintering flue gas is dusted using a belt dust collector, the bags are easily burned through by sparks in the flue gas; 2. Condensation in the sintering flue gas easily causes low-temperature corrosion of the bags; 3. The sintering flue gas temperature fluctuates greatly, affecting the dust removal efficiency of the bag dust collector, and when the sintering flue gas temperature is too high, it is easy to cause the bags to catch fire; 4. The existing sintering flue gas bag dust removal system has a large flue gas processing capacity, high energy consumption, and the waste heat in the flue gas is not fully utilized.

[0034] like Figure 2 and Figure 3As shown, the present invention provides a safe sintering machine head flue gas bag dust removal system 100, including a sintering device 10, a first flue gas collection and treatment device 20, a second flue gas collection and treatment device 30, a third flue gas collection and treatment device 40, a mixing and denitrification device 50, a waste heat treatment device 60 and a smoke exhaust mechanism 70. The sintering device 10 includes a sintering machine 11, a head bellows mechanism 12 arranged near the head of the sintering machine 11, a tail bellows mechanism arranged near the tail of the sintering machine 11, and a middle bellows mechanism 13 between the head bellows mechanism 12 and the tail bellows mechanism. The head bellows mechanism 12, the middle bellows mechanism 13 and the tail bellows mechanism are all located below the sintering machine 11. The first flue gas collection and treatment device 20 is used to collect the head bellows mechanism. The flue gas discharged from the structure 12 is introduced into the mixing and denitrification device 50, the second flue gas collecting and treatment device 30 is used to collect the flue gas discharged from the middle bellows mechanism 13 and / or the mixing and denitrification device 50, and introduce it into the smoke exhaust mechanism 70 after treatment, the third flue gas collecting and treatment device 40 is used to collect the flue gas discharged from the tail bellows mechanism, and introduce it into the mixing and denitrification device 50 after combustion treatment, the mixing and denitrification device 50 is used to receive the flue gas discharged from the first flue gas collecting and treatment device 20, and discharge it to the second flue gas collecting and treatment device 30 and / or the waste heat treatment device 60 after treatment, the mixing and denitrification device 50 is used to receive the flue gas discharged from the third flue gas collecting and treatment device 40, and discharge it to the second flue gas collecting and treatment device 30 and / or the waste heat treatment device 60 after treatment.

[0035] The safe sintering machine head flue gas bag dust removal system 100 provided by the present invention includes a sintering device 10, a first flue gas collection and treatment device 20, a second flue gas collection and treatment device 30, a third flue gas collection and treatment device 40, a mixing and denitrification device 50, a waste heat treatment device 60 and a smoke exhaust mechanism 70. The first flue gas collection and treatment device 20 is used to collect the flue gas discharged from the head bellows mechanism 12 and introduce it into the mixing and denitrification device 50. The second flue gas collection and treatment device 30 is used to collect the flue gas discharged from the middle bellows mechanism 13 and / or the mixing and denitrification device 50 and introduce it into the main chimney 7. 1, the third flue gas collecting and treating device 40 is used to collect the flue gas discharged from the tail bellows mechanism and introduce it into the mixing and denitrification device 50 after combustion treatment; the solution of the present invention fully considers the various characteristics of the sintering process of the sintering machine 11. Since the concentration of nitrogen compounds in the flue gas upstream of the second flue gas collecting and treating device is the highest during the sintering process of the sintering machine, the concentration of nitrogen compounds in the flue gas upstream of the first flue gas collecting and treating device is second, and the concentration of nitrogen compounds in the flue gas upstream of the third flue gas collecting and treating device is the lowest, the concentration of nitrogen oxides in the flue gas upstream of the first and third flue gas collecting and treating devices is the lowest. It is lower than the second flue gas collection and treatment device; simple SCR denitrification can meet the emission standards; the flue gas discharged from the head bellows mechanism 12 is sent to the mixing denitrification device 50 for treatment, and then sent to the second flue gas collection and treatment device 30 for secondary treatment and discharged or sent to the waste heat treatment device 60 for waste heat recovery and treatment and then discharged, which is conducive to reducing the emission of nitrogen compounds; the flue gas discharged from the tail bellows mechanism is treated separately by the third flue gas collection and treatment device 40. Since the combustion zone at the tail position of the sintering machine 11 moves to the bottom layer, the carbon in the material layer may not be completely ignited after ignition. The fully burned embers enter the tail bellows mechanism under the action of exhaust, so the flue gas discharged from the tail bellows mechanism may contain sparks. By setting up the combustion chamber 43, the flue gas discharged from the tail bellows mechanism is burned again to facilitate the removal of sparks, thereby avoiding the technical problem of the existing sintering machine 11 head using a bag-type dust removal system, in which the bag is easily burned through by sparks in the flue gas and there is a safety problem; at the same time, the flue gas discharged from various positions of the sintering machine 11 is synchronously treated by the first flue gas collecting and treating device 20, the second flue gas collecting and treating device 30, and the third flue gas collecting and treating device 40, and the flue gas treatment efficiency is high.

[0036] It is understandable that after the safe sintering machine head flue gas bag dust removal system 100 enters normal working state, the flue gases from the first flue gas collection and treatment device and the second flue gas collection and treatment device can be mixed and denitrated in the mixing and denitrification device 50 according to actual needs. Specifically, ammonia reacts with nitrogen oxides to generate nitrogen.

[0037] It can be understood that the sintering device 10 includes a sintering machine 11, a base material laying mechanism, a mixing and distributing mechanism, an ignition and insulation furnace, a head bellows mechanism 12, a middle bellows mechanism 13 and a tail bellows mechanism, wherein the base material laying mechanism, the mixing and distributing mechanism and the ignition and insulation furnace are located above the sintering machine 11 and are arranged in sequence, the head bellows mechanism 12, the middle bellows mechanism 13 and the tail bellows mechanism are located below the sintering machine 11 for exhausting the sintering machine 11, the head bellows mechanism 12, the middle bellows mechanism 13 and the tail bellows mechanism are arranged in sequence, and the head bellows mechanism 12, the middle bellows mechanism 13 and the tail bellows mechanism constitute a sintering bellows assembly. The sintering machine 11 comprises a head wheel and a tail wheel. A base material laying mechanism, a mixing and distributing mechanism, and an ignition and holding furnace are located near the head wheel. The head bellows mechanism 12 is a sintering bellows assembly located directly below the ignition and holding furnace. The tail bellows mechanism is a sintering bellows assembly located near the tail wheel of the sintering machine 11. The middle bellows mechanism 13 is a sintering bellows assembly located between the head bellows mechanism 12 and the tail bellows mechanism. Specifically, in the xx sintering system, the head bellows mechanism 12 consists of n sintering bellows located at the head, and the tail bellows mechanism consists of m sintering bellows located at the tail. Alternatively, the specific position of the tail bellows mechanism can be determined by the flue gas temperature.

[0038] It can be understood that in the present invention, the head bellows mechanism 12 includes a plurality of head sintering bellows arranged in sequence, the middle bellows mechanism 13 includes a plurality of middle sintering bellows arranged in sequence, and the tail bellows mechanism includes a plurality of tail sintering bellows arranged in sequence. The head sintering bellows, the middle sintering bellows and the tail sintering bellows are combined to constitute a sintering bellows assembly, which is used to exhaust air to the sintering machine 11.

[0039] It can be understood that the smoke exhaust mechanism 70 may include a main chimney 71 and an auxiliary chimney 72 , wherein the main chimney 71 is connected to the exhaust end of the second flue gas collection and treatment device 30 , and the auxiliary chimney 72 is connected to the exhaust end of the waste heat treatment device 60 .

[0040] It can be understood that the second flue gas collecting and processing device 30 can be used to collect the flue gas discharged from the middle bellows mechanism 13 and introduce it into the smoke exhaust mechanism 70 after treatment; it can also be said that the second flue gas collecting and processing device 30 is used to collect the flue gas discharged from the mixing and denitrification device 50 and introduce it into the smoke exhaust mechanism 70 after treatment; it can also be said that the second flue gas collecting and processing device 30 is used to collect the flue gas discharged from the middle bellows mechanism 13 and the mixing and denitrification device 50 and introduce it into the smoke exhaust mechanism 70 after treatment. There is no limitation here and it is set according to specific circumstances.

[0041] Optionally, the first flue gas collection and treatment device and the third flue gas collection and treatment device can perform coordinated flue gas treatment. Because the nitrogen oxide concentration is already very low, further reducing the concentration slightly will meet emission requirements. The nitrogen oxide and sulfur dioxide concentrations in the head and tail bellows are low, while the nitrogen oxide and sulfur dioxide concentrations in the middle bellows are high. The head and tail bellows can use a simple SCR process for denitrification as needed, while the middle flue gas requires a dedicated desulfurization and denitrification tower to purify the flue gas. The working principle of the denitrification reaction chamber is the oxidation-reduction reaction of ammonia and nitrogen oxides to produce nitrogen.

[0042] Furthermore, in order to facilitate independent treatment of the flue gas discharged from the head bellows mechanism 12, the middle bellows mechanism 13 and the tail bellows mechanism, the air inlet end of the first flue gas collecting and treating device 20 is connected to the exhaust end of the head bellows mechanism 12, the air outlet end of the first flue gas collecting and treating device 20 is connected to the first air inlet end of the mixing and denitrification device 50, the first air inlet end of the second flue gas collecting and treating device 30 is connected to the exhaust end of the middle bellows mechanism 13, the air outlet port of the second flue gas collecting and treating device 30 is connected to the exhaust mechanism 70, the air inlet end of the third flue gas collecting and treating device 40 is connected to the exhaust end of the tail bellows mechanism, the air outlet end of the second flue gas collecting and treating device 30 is connected to the second air inlet end of the mixing and denitrification device 50, the first exhaust end of the mixing and denitrification device 50 is connected to the air inlet end of the waste heat treatment device 60, the second exhaust end of the mixing and denitrification device 50 is connected to the second air inlet end of the second flue gas collecting and treating device 30, and the exhaust end of the waste heat treatment device 60 is connected to the exhaust mechanism 70.

[0043] Furthermore, in order to adaptively treat the flue gas discharged from the mixing and denitrification device 50, a first waste heat utilization regulating valve 81 is provided between the first exhaust end of the mixing and denitrification device 50 and the air inlet end of the waste heat treatment device 60, and a second waste heat utilization regulating valve 82 is provided between the second exhaust end of the mixing and denitrification device 50 and the second flue gas collection and treatment device 30.

[0044] It can be understood that in the present invention, the third flue gas collecting and processing device 40 is used to collect the flue gas discharged by the tail bellows mechanism and burn it to produce high-temperature combustion gas. The high-temperature combustion gas can be mixed with the flue gas output by the first flue gas collecting and processing device 20 in the mixing chamber 51 of the mixing and denitrification device 50, thereby increasing the overall flue gas temperature and making the overall flue gas temperature reach the temperature of the SCR denitrification reaction (180~420℃), which is convenient for treating the flue gas discharged by the first flue gas collecting and processing device 20 and the third flue gas collecting and processing device 40; at the same time, under the action of the high-temperature combustion gas, it is beneficial to increase the temperature of the waste heat flue gas discharged by the mixing and denitrification device 50, and then the waste heat flue gas can be allowed to enter the second flue 32 to increase the flue gas temperature in the second flue 32, which is beneficial to avoid the influence of low-temperature condensation on the bag dust collector, or the waste heat flue gas can be allowed to enter the waste heat treatment device 60 for waste heat utilization, thereby improving heat utilization efficiency.

[0045] Furthermore, to facilitate adaptive processing of the waste heat exhaust from the mixing and denitrifying device 50, a first waste heat utilization regulating valve 81 is provided between the first exhaust port of the mixing and denitrifying device 50 and the waste heat treatment device 60, and a second waste heat utilization regulating valve 82 is provided between the second exhaust port of the mixing and denitrifying device 50 and the second flue gas collection and treatment device 30. In real time, if the flue gas temperature in the pre-settling chamber 331 is low, the amount of flue gas discharged from the mixing and denitrifying device 50 into the second flue 32 of the second flue gas collection and treatment device 30 can be increased, thereby raising the flue gas temperature in the pre-settling chamber 331 and reducing the effects of condensation.

[0046] Furthermore, the second flue gas collection and treatment device 30 includes a second flue gas pipe mechanism 31, a second flue 32, and an exhaust treatment mechanism 33. The first input end of the second flue gas duct is connected to the exhaust end of the middle bellows mechanism 13 via the second flue gas pipe mechanism 31. A second waste heat utilization regulating valve 82 is provided between the second input end of the second flue gas duct and the mixing and denitrification device 50. The output end of the second flue gas duct is connected to the exhaust mechanism 70 via the exhaust treatment mechanism 33. An alkali ash spraying mechanism 321 and a first flue gas diversion agitator 322 are provided at the outlet of the second flue gas duct 32. Optionally, the first flue gas diversion agitator 322 is a diversion fan that can mix the flue gas while diverting and rotating.

[0047] In the present invention, a second temperature detector 336 is installed within the pre-sedimentation chamber 331. This second temperature detector 336 can detect the flue gas temperature and then feed the signal back to the second waste heat utilization regulating valve 82. By adjusting the second waste heat utilization regulating valve 82 to control the flow of waste heat flue gas entering, the temperature within the pre-sedimentation chamber 331 is controlled. After being treated in the pre-sedimentation chamber 33130, the flue gas enters the bag filter 332 under the action of the second exhaust fan for dust removal and then enters the flue gas purifier 333. The flue gas purifier 333 primarily performs desulfurization and denitrification. The nitrogen oxide concentration here is lower than that of the sintering machine 11. If the emission concentration is lower than the local environmental emission requirements, denitrification may not be performed. The purified flue gas is discharged through the main chimney 71.

[0048] Furthermore, the alkali ash powder spraying mechanism 321 includes an alkali ash bin and an ash spraying nozzle. The ash spraying nozzle is arranged in the second flue 32 and close to the outlet of the second flue 32. The alkali ash bin is arranged outside the second flue 32 and is connected to the ash spraying nozzle. The first flue gas diversion agitator 322 is arranged on the second flue 32 and is downstream of the ash spraying nozzle.

[0049] Furthermore, the exhaust treatment mechanism 33 includes a pre-sedimentation chamber 331, a bag dust collector 332, a flue gas purifier 333, and a second induced draft fan 334, which are located downstream of the second flue 32 and arranged in sequence and interconnected. The inner cavity of the pre-sedimentation chamber 331 is respectively provided with a second flue gas diversion agitator 335 and a second temperature detector 336. The second flue 32, the pre-sedimentation chamber 331, the bag dust collector 332, the flue gas purifier 333, the second induced draft fan 334 and the smoke exhaust mechanism 70 are connected through an exhaust duct, and the second induced draft fan 334 is arranged between the flue gas purifier 333 and the smoke exhaust mechanism 70.

[0050] In practice, an alkali ash spraying mechanism 321 is installed at the outlet of the second flue gas duct, addressing the existing problem of condensation in sintering flue gas, which can easily cause low-temperature corrosion of the bag filters. When the sintering machine 11 is cold-started, the flue gas temperature is low. By increasing the flow rate of the gas inlet pipe 46, a large amount of high-temperature flue gas is generated by burning low-calorific-value blast furnace gas (high flue gas temperature does not affect SCR, as even temperatures above 400°C are suitable for SCR denitrification due to its wide reaction temperature range). Once this high-temperature flue gas enters the second flue gas duct, it effectively raises the flue gas temperature within the duct, reducing condensation. Furthermore, when the sintering machine 11 is cold-started at low temperatures, the alkali ash spraying mechanism 321 at the rear of the second flue duct 32 can be activated. By injecting alkali ash (quicklime, light-burned magnesium oxide powder), the flue gas alkalinity can be adjusted. The alkali ash also performs pre-desulfurization and removes moisture from the flue gas. This dual regulation effectively prevents low-temperature corrosion of the bag filters, even during a cold-start of the sintering machine 11.

[0051] Furthermore, the third flue gas collection and treatment device 40 includes a third flue pipe mechanism 41, a third flue 42, a combustion chamber 43, and a third induced draft fan 44. The input end of the third flue is connected to the exhaust end of the tail bellows mechanism via the third flue pipe mechanism 41, and the output end of the third flue is connected to the combustion chamber 43. The combustion chamber 43 is connected to the air intake end of the mixing and denitration device 50 via the third induced draft fan 44. A burner 45 is provided in the combustion chamber 43, which is connected to a gas inlet pipe 46. A gas regulating valve 47 is provided on the gas inlet pipe 46. It is understood that the temperature of the high-temperature gas can be increased or decreased by controlling the amount of gas entering the combustion chamber 43. In the present invention, there is a large amount of surplus blast furnace gas inside the steel enterprise due to its low calorific value, and much of it is directly released into the air. The gas inlet pipe 46 can be connected to the blast furnace gas, and the low calorific value surplus blast furnace gas is used to burn to remove sparks in the high-temperature flue gas at the tail end of the sintering machine 11, so that the sparks are fully burned in the combustion chamber 43.

[0052] Furthermore, the tail bellows mechanism includes a plurality of tail sintering bellows arranged in sequence, and the safe sintering machine head flue gas bag dust removal system 100 also includes a flue gas guiding device 90, and the flue gas guiding device 90 includes a three-way control mechanism, and the three-way control mechanism has a total inlet, a first outlet and a second outlet. The total inlet of the three-way control mechanism is used to connect with the tail sintering bellows close to the side of the middle bellows mechanism 13, the first outlet is used to connect with the second flue gas collecting and treating device 30, and the second outlet is used to connect with the third flue gas collecting and treating device 40. The flue gas guiding device 90 is used to discharge the flue gas from the tail sintering bellows close to the side of the middle bellows mechanism 13 into the second flue gas collecting and treating device 30 or the third flue gas collecting and treating device 40.

[0053] It can be understood that in the present invention, the number of tail sintering bellows can be determined by the bellows temperature. Specifically, the three-way control mechanism includes three three-way valves, which are used to connect with the three tail sintering bellows close to the side of the middle bellows mechanism 13.

[0054] Specifically, due to the influence of various factors (including material thickness, air leakage rate, trolley speed, etc.), the end point of combustion may be close to the tail wheel position of the sintering machine 11, or it may be in advance of the tail wheel position of the sintering machine 11. By setting a three-way control mechanism, it is convenient to guide the gas with sparks into the combustion chamber 43 for combustion, so as to remove the sparks and thereby improve the overall safety.

[0055] Furthermore, the mixing and denitrification device 50 includes a mixing chamber 51 and a denitrification reaction chamber arranged in sequence. The mixing chamber 51 is provided with an ammonia inlet pipe 54, and the denitrification reaction chamber is provided with a first temperature detector 53. Optionally, the denitrification reaction chamber is an SCR denitrification reaction chamber. Optionally, ammonia and nitrogen oxides undergo oxidation-reduction to produce nitrogen.

[0056] Furthermore, in order to discharge the flue gas from the head sintering bellows into the mixing and denitrification device 50, the first flue gas collection and treatment device 20 includes a first flue gas pipe mechanism 21, a first flue gas duct 22 and a first induced draft fan 23. The input end of the first flue gas duct 22 is connected to the exhaust end of the head bellows mechanism 12 through the first flue gas pipe mechanism 21, and the output end of the first flue gas duct 22 is connected to the air inlet end of the mixing and denitrification device 50 through the first induced draft fan 23.

[0057] In a specific implementation, the head bellows mechanism 12 includes a plurality of head sintering bellows arranged in sequence, the first flue gas pipe mechanism 21 includes a plurality of first flue gas ducts arranged in parallel, the first flue gas ducts and the head sintering bellows are arranged one by one, so that the flue gas of each head sintering bellows is discharged into the first flue gas duct, and the flue gas in the first flue gas duct is discharged into the mixing and denitrification device 50 under the action of the first induced draft fan 23; the middle bellows mechanism 13 includes a plurality of middle sintering bellows arranged in sequence, the first flue gas duct is arranged in parallel, and the flue gas in the first flue gas duct is discharged into the mixing and denitrification device 50 under the action of the first induced draft fan 23; the middle bellows mechanism 13 includes a plurality of middle sintering bellows arranged in sequence, The second flue gas pipe mechanism 31 includes multiple parallel second flue gas ducts, each corresponding to the central sintering bellows. The flue gas from each central sintering bellows is discharged into the second flue gas duct. The tail bellows mechanism includes multiple sequentially arranged tail sintering bellows. The third flue gas pipe mechanism 41 includes multiple parallel third flue gas ducts, each corresponding to the tail sintering bellows. The three-way valve is located on the second flue gas duct near the central bellows mechanism 13.

[0058] Furthermore, the waste heat treatment device 60 includes a waste heat boiler 61, a dust collector 62, and a waste heat induced draft fan 63, arranged sequentially along the airflow direction. A first waste heat utilization regulating valve 81 is provided between the waste heat boiler 61 and the mixing and denitrification device 50. The waste heat boiler 61 and the waste heat induced draft fan 63 are connected via the dust collector. The waste heat induced draft fan 63 is provided between the dust collector and the smoke exhaust mechanism 70. The dust collector 62 is a bag dust collector.

[0059] During specific operation, the flue gas in the first flue is guided to the mixing chamber 51 by the action of the first induced draft fan 23; the flue gas in the third flue 42 first enters the combustion chamber 43 under the action of the third induced draft fan 44 to remove sparks in the tail high-temperature flue gas, and the inner cavity of the combustion chamber 43 is provided with a burner, which is connected to the external gas inlet pipe 46, and the gas inlet pipe 46 is provided with a gas regulating valve 47; the gas is preferably the surplus blast furnace gas, converter gas and other low calorific value gas in the steel enterprise, and the combustion of low calorific value gas can remove sparks in the flue gas and the combustion temperature will not be too high to form nitrogen oxides; by designing the combustion chamber 43 to remove sparks in the flue gas Star; There is a large amount of surplus blast furnace gas in steel enterprises due to its low calorific value, and much of it is directly released into the air. The low calorific value surplus blast furnace gas is burned to remove sparks in the high-temperature flue gas at the tail end of the sintering machine 11, so that the sparks are fully burned out in the combustion chamber 43; the above design can also be interrelated with the SCR denitrification reaction, because the existing SCR operation of sintering flue gas is difficult and the cost is high because the sintering flue gas cannot reach the temperature of the SCR denitrification reaction (180-420℃). After the flue gas in the tail bellows of the sintering machine 11 passes through the combustion chamber 43 to remove sparks, it can be heated up for the subsequent SCR denitrification reaction.

[0060] The mixing chamber 51 is connected to an ammonia inlet pipe 54. The flue gas in the mixing chamber 51 is transported to the SCR denitration reaction chamber via a pipeline. The SCR denitration reaction chamber is equipped with a first temperature detector 53. The first temperature detector 53 monitors the temperature in the SCR denitration reaction chamber and then adjusts the gas flow rate based on the temperature in the combustion chamber 43 by adjusting the gas regulating valve 47 on the gas inlet pipe 46, thereby regulating the temperature. The mixed flue gas passes through the SCR denitration reaction chamber to remove nitrogen oxides. After the removal of sparks and nitrogen oxides, the flue gas can go in two directions: the first direction is connected to the second flue 32 through a pipeline, and the second direction is connected to the waste heat boiler 61 through a pipeline to recover the waste heat in the flue gas. The two pipelines are respectively equipped with regulating valves. After the waste heat in the flue gas is recovered, it can enter the dust collector 62 under the action of the third induced draft fan 44 for dust removal and then be directly discharged into the atmosphere through the auxiliary chimney 72.

[0061] A first flue gas flow guide agitator 322 (which may be a flow guide fan that mixes the flue gas while it is rotating) is provided at the rear end of the second flue 32, which is connected to a pre-settling chamber 331 via a pipeline. A second flue gas flow guide agitator 335 (which may be a flow guide fan that mixes the flue gas while it is rotating) is provided within the pre-settling chamber 331. A second temperature detector 336 is provided within the pre-settling chamber 331. The second temperature detector 336 can detect the flue gas temperature and then feed the signal back to the second waste heat utilization regulating valve 82. By adjusting the second waste heat utilization regulating valve 82 to control the flow rate of high-temperature flue gas entering, the temperature within the pre-settling chamber 331 is controlled. The flue gas treated in the pre-settling chamber 331 enters the bag filter 332 under the action of the third induced draft fan 44 for dust removal, and then enters the flue gas purifier 333.

[0062] The specific working mode and beneficial effects of the safe sintering machine head flue gas bag dust removal system 100 of the present invention are as follows:

[0063] By setting up the third flue gas collection and treatment device 40, the problem that the bag is easily burned by sparks in the flue gas when the existing sintering flue gas is removed by a belt dust collector is solved. The third flue gas collection and treatment device 40 receives the flue gas discharged by the tail bellows mechanism and performs combustion treatment, and passes the flue gas containing sparks into the combustion chamber 43 for sufficient combustion treatment, effectively removing sparks from the flue gas. Specifically, because the sintering mixed material is sintered from top to bottom under the action of exhaust during the sintering process, the middle and head combustion zones of the sintering machine 11 are in the upper and middle part of the material layer. First, it is difficult for sparks to be drawn into the large flue. Even if there are sparks, there is a wet zone below the material layer, and the sparks will be extinguished after passing through the wet zone. Therefore, the sparks in the sintering flue gas mainly come from the tail of the sintering machine 11. Because the combustion zone at the tail of the sintering machine 11 moves to the bottom layer, the carbon in the material layer may not be completely burned after ignition before entering the tail bellows mechanism under the action of exhaust, so the flue gas of the tail bellows mechanism may contain sparks. In practice, the gas inlet pipe 46 receives low-calorific-value excess blast furnace gas. Steel companies often have a large excess of blast furnace gas due to its low calorific value, much of which is released directly into the air. This low-calorific-value excess blast furnace gas is burned to remove sparks from the high-temperature flue gas at the tail of the sintering machine 11, allowing the sparks to burn fully within the combustion chamber 43. Furthermore, because existing sintering flue gas does not reach the SCR denitration reaction temperature (280-420°C), the present invention heats the flue gas discharged from the tail bellows mechanism in the combustion chamber 43 after removing sparks, thereby facilitating the subsequent SCR denitration reaction.

[0064] By arranging that the flue gas after combustion in the combustion chamber 43 is discharged into the second flue gas duct, and by providing an alkali ash powder spraying mechanism 321 at the outlet position of the second flue gas duct, the problem that the existing sintering flue gas condensation easily causes low-temperature corrosion of the bag is solved. When the sintering machine 11 is cold-started, the flue gas temperature is low. By increasing the flow rate of the gas inlet pipe 46, a large amount of high-temperature flue gas is generated by burning low-calorific value blast furnace gas (the high flue gas temperature will not affect the SCR, because even if the temperature is raised to above 400°C, it is suitable for SCR denitrification, and its reaction temperature is very wide). After the high-temperature flue gas enters the second flue gas duct, it can effectively increase the flue gas temperature in the second flue gas duct and reduce condensation. In addition, when the sintering machine 11 is cold-started and the temperature is low, the alkali ash spraying mechanism 321 at the tail end of the second flue 32 can be started. By spraying alkali ash (quicklime, light-burned magnesium oxide powder), the alkalinity of the flue gas can be adjusted. The alkali ash can also simultaneously realize the pre-desulfurization function and the function of removing water vapor in the flue gas. Through the above dual adjustment, even when the sintering machine 11 is cold-started, the bag filter can effectively avoid the problem of low-temperature corrosion.

[0065] Combustion is carried out in the combustion chamber 43 to generate high-temperature flue gas. The high-temperature flue gas is discharged into the mixing denitrification device 50, which helps to carry out the SCR denitrification reaction (increasing the temperature of the flue gas discharged from the first flue gas duct 22). The high-temperature flue gas can also be discharged into the second flue gas duct. The temperature and flow rate of the high-temperature flue gas are controlled by the second waste heat regulating valve 82, so that the temperature of the flue gas entering the bag filter is controlled within a certain range, thereby ensuring the dust removal effect of the bag filter.

[0066] The flue gas treatment efficiency is high, but there are problems with the sintering flue gas bag dust removal system, such as large flue gas treatment capacity, high energy consumption, and insufficient utilization of waste heat in the flue gas. Specifically, the flue gas from the head of the sintering machine 11 and the tail of the sintering machine 11 of the utility model (the sintering process at the tail of the sintering machine 11 is almost completed, and there are very few nitrogen oxides and sulfur oxides in the flue gas, while the flue gas from the head of the sintering machine 11 mainly contains nitrogen oxides) can be discharged after dust removal after the SCR denitrification reaction. There is no need for a matching flue gas desulfurization and denitrification system, which can effectively reduce the amount of flue gas treatment. In addition, the flue gas from the SCR denitrification reaction can be used to supply the waste heat boiler 61 to fully recover the waste heat therein.

[0067] The present invention also provides a safe sintering machine head flue gas bag type dust removal method, comprising the following steps:

[0068] Before the initial sintering trolley on the sintering machine 11 runs to the tail bellows mechanism:

[0069] Obtain a first flue gas temperature of the first flue gas in the mixing and denitrification device 50. If the first flue gas temperature is lower than a first preset temperature, start the combustion chamber 43 of the third flue gas collecting and processing device 40 to perform combustion to generate high-temperature flue gas, and allow the high-temperature flue gas to enter the mixing and denitrification device 50 until the first flue gas temperature reaches the first preset temperature. The mixing and denitrification device 50 operates to remove nitrogen oxides in the first flue gas. Obtain a second flue gas temperature of the second flue gas in the pre-settling chamber 331 of the second flue gas collecting and processing device 30. If the second flue gas temperature is lower than the second preset flue gas temperature, start the combustion chamber 43 of the third flue gas collecting and processing device 40 to perform combustion to generate high-temperature flue gas. After the high-temperature flue gas is processed in the mixing and denitrification device 50, it is discharged into the second flue gas collecting and processing device 30, thereby increasing the flue gas temperature of the second flue gas collecting and processing device 30, and allow the alkali ash spraying mechanism 321 of the second flue gas collecting and processing device 30 to operate to adjust the alkalinity of the flue gas.

[0070] When the initial sintering trolley on the sintering machine 11 runs to the tail bellows mechanism:

[0071] The combustion chamber 43 of the third flue gas collection and treatment device 40 performs combustion to remove sparks discharged by the tail bellows mechanism, and generates high-temperature flue gas that enters the mixing and denitrification device 50;

[0072] Obtain the first flue gas temperature of the first flue gas in the mixing and denitrification device 50. If the first flue gas temperature is lower than the first preset temperature, start the combustion chamber 43 of the third flue gas collecting and treating device 40 to perform combustion to generate high-temperature flue gas, and allow the high-temperature flue gas to enter the mixing and denitrification device 50 until the first flue gas temperature reaches the first preset temperature. The mixing and denitrification device 50 works to remove nitrogen oxides in the first flue gas. Obtain the second flue gas temperature of the second flue gas in the pre-sedimentation chamber 331 of the second flue gas collecting and treating device 30. If the second flue gas temperature is lower than the second preset flue gas temperature, start the combustion chamber 43 of the third flue gas collecting and treating device 40 to perform combustion to generate high-temperature flue gas. After the high-temperature flue gas is treated in the mixing and denitrification device 50, it is discharged into the second flue gas collecting and treating device 30, thereby increasing the flue gas temperature of the second flue gas collecting and treating device 30, and enable the alkali ash spraying mechanism 321 of the second flue gas collecting and treating device 30 to work to adjust the alkalinity of the flue gas.

[0073] It can be understood that the first preset temperature and the second preset flue gas temperature are set according to actual conditions.

[0074] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A safe sintering machine head flue gas bag dust removal system, characterized by: The sintering device comprises a sintering device, a first flue gas collection and treatment device, a second flue gas collection and treatment device, a third flue gas collection and treatment device, a mixing and denitrification device, a waste heat treatment device, and a smoke exhaust mechanism. The sintering device comprises a sintering machine, a head bellows mechanism arranged near the head of the sintering machine, a tail bellows mechanism arranged near the tail of the sintering machine, and a middle bellows mechanism located between the head bellows mechanism and the tail bellows mechanism. The head bellows mechanism, the middle bellows mechanism, and the tail bellows mechanism are all located below the sintering machine. The first flue gas collecting and processing device is used to collect the flue gas discharged by the head bellows mechanism and introduce it into the mixing and denitrification device, the second flue gas collecting and processing device is used to collect the flue gas discharged by the middle bellows mechanism and / or the mixing and denitrification device and introduce it into the exhaust mechanism after treatment, the third flue gas collecting and processing device includes a combustion chamber, the third flue gas collecting and processing device is used to collect the flue gas discharged by the tail bellows mechanism and introduce it into the mixing and denitrification device after combustion treatment, the mixing and denitrification device is used to receive the flue gas discharged by the first flue gas collecting and processing device and discharge it to the second flue gas collecting and processing device and / or the waste heat treatment device after treatment, the mixing and denitrification device is used to receive the flue gas discharged by the third flue gas collecting and processing device and discharge it to the second flue gas collecting and processing device and / or the waste heat treatment device after treatment; The waste heat treatment device includes a waste heat boiler, a bag dust collector and a waste heat induced draft fan which are arranged in sequence along the air flow direction.

2. The safe sintering machine head fume bag dust removal system according to claim 1 is characterized by: The air inlet end of the first flue gas collection and treatment device is connected to the exhaust end of the head bellows mechanism, and the air outlet end of the first flue gas collection and treatment device is connected to the first air inlet end of the mixing and denitrification device; The first air inlet end of the second smoke collecting and processing device is connected to the exhaust end of the middle bellows mechanism, and the air outlet port of the second smoke collecting and processing device is connected to the smoke exhaust mechanism; The air inlet end of the third flue gas collection and treatment device is connected to the exhaust end of the tail bellows mechanism, and the air outlet end of the second flue gas collection and treatment device is connected to the second air inlet end of the mixing and denitration device; The first exhaust end of the mixing and denitrification device is connected to the air inlet end of the waste heat treatment device, the second exhaust end of the mixing and denitrification device is connected to the second air inlet end of the second flue gas collection and treatment device, and the exhaust end of the waste heat treatment device is connected to the smoke exhaust mechanism.

3. The safe sintering machine head fume bag dust removal system according to claim 1 is characterized by: A first waste heat utilization regulating valve is provided between the first exhaust end of the mixing and denitrification device and the waste heat treatment device, and a second waste heat utilization regulating valve is provided between the second exhaust end of the mixing and denitrification device and the second flue gas collection and treatment device.

4. The safe sintering machine head fume bag dust removal system according to claim 3 is characterized by: The second flue gas collection and treatment device includes a second flue gas pipe mechanism, a second flue and an exhaust treatment mechanism. The first input end of the second flue gas duct is connected to the exhaust end of the middle bellows mechanism through the second flue gas pipe mechanism. The second waste heat utilization regulating valve is provided between the second input end of the second flue gas duct and the mixing and denitrification device. The output end of the second flue gas duct is connected to the exhaust mechanism through the exhaust treatment mechanism. The alkali ash spraying mechanism and the first flue gas diversion agitator are provided in sequence at the outlet position of the second flue gas duct.

5. The safe sintering machine head fume bag type dust removal system according to claim 4 is characterized in that: The alkali ash powder spraying mechanism includes an alkali ash bin and an ash spraying nozzle. The ash spraying nozzle is arranged in the second flue and close to the outlet of the second flue. The alkali ash bin is arranged outside the second flue and is connected to the ash spraying nozzle. The first flue gas diversion agitator is arranged on the second flue and downstream of the ash spraying nozzle.

6. The safe sintering machine head fume bag type dust removal system according to claim 5 is characterized by: The exhaust treatment mechanism includes a pre-settling chamber, a bag filter, a flue gas purifier, and a second induced draft fan, which are arranged in sequence and interconnected downstream of the second flue. The inner cavity of the pre-settling chamber is respectively provided with a second flue gas guide stirrer and a second temperature detector; The second flue, the pre-settling chamber, the bag filter, the flue gas purifier, the second induced draft fan and the smoke exhaust mechanism are connected through an exhaust duct, and the second induced draft fan is arranged between the flue gas purifier and the smoke exhaust mechanism.

7. The safe sintering machine head fume bag type dust removal system according to any one of claims 4 to 6, characterized in that: The third flue gas collection and treatment device includes a third flue pipe mechanism, a third flue, a combustion chamber, and a third induced draft fan. The input end of the third flue is connected to the exhaust end of the tail bellows mechanism through the third flue pipe mechanism, the output end of the third flue is connected to the combustion chamber, and the combustion chamber is connected to the air inlet end of the mixing and denitration device through the third induced draft fan. A combustion burner is provided in the combustion chamber, the combustion burner is communicated with a gas inlet pipe, and a gas regulating valve is provided on the gas inlet pipe.

8. The safe sintering machine head fume bag type dust removal system according to claim 7 is characterized by: The tail bellows mechanism includes a plurality of tail sintering bellows arranged in sequence; The safe sintering machine head flue gas bag dust removal system also includes a flue gas guiding device, which includes a three-way control mechanism. The three-way control mechanism has a total inlet, a first outlet and a second outlet. The total inlet of the three-way control mechanism is used to connect with the tail sintering bellows close to the side of the middle bellows mechanism, the first outlet is used to connect with the second flue gas collecting and processing device, and the second outlet is used to connect with the third flue gas collecting and processing device. The flue gas guiding device is used to discharge the flue gas from the tail sintering bellows close to the side of the middle bellows mechanism into the second flue gas collecting and processing device or the third flue gas collecting and processing device.

9. The safe sintering machine head fume bag type dust removal system according to any one of claims 4 to 6, characterized in that: The mixing and denitrification device comprises a mixing chamber and a denitrification reaction chamber which are arranged in sequence. The mixing chamber is provided with an ammonia inlet pipe, and the denitrification reaction chamber is provided with a first temperature detector.

10. A safe sintering machine head flue gas bag dust removal method, characterized in that: The safe sintering machine head flue gas bag dust removal system according to any one of claims 4 to 9 comprises the following steps: Before the initial sintering trolley on the sintering machine runs to the tail bellows mechanism: obtaining a first flue gas temperature of the first flue gas in the mixing and denitration device, and if the first flue gas temperature is less than a first preset temperature, starting a combustion chamber of a third flue gas collection and treatment device to perform combustion to generate high-temperature flue gas, and allowing the high-temperature flue gas to enter the mixing and denitration device until the first flue gas temperature reaches the first preset temperature, and the mixing and denitration device operates to remove nitrogen oxides in the first flue gas; obtaining a second flue gas temperature of the second flue gas in the pre-settling chamber of the second flue gas collection and treatment device; if the second flue gas temperature is lower than a second preset flue gas temperature, activating a combustion chamber of the third flue gas collection and treatment device to perform combustion to generate high-temperature flue gas; treating the high-temperature flue gas in the mixing and denitrification device and then discharging it into the second flue gas collection and treatment device, thereby increasing the flue gas temperature of the second flue gas collection and treatment device; and operating an alkali ash spraying mechanism of the second flue gas collection and treatment device to adjust the alkalinity of the flue gas; When the initial sintering trolley on the sintering machine runs to the tail bellows mechanism: The combustion chamber of the third flue gas collection and treatment device performs combustion to remove sparks discharged by the tail bellows mechanism, and generates high-temperature flue gas that enters the mixing and denitrification device; obtaining a first flue gas temperature of the first flue gas in the mixing and denitration device, and if the first flue gas temperature is less than a first preset temperature, starting a combustion chamber of a third flue gas collection and treatment device to perform combustion to generate high-temperature flue gas, and allowing the high-temperature flue gas to enter the mixing and denitration device until the first flue gas temperature reaches the first preset temperature, and the mixing and denitration device operates to remove nitrogen oxides in the first flue gas; The second flue gas temperature of the second flue gas in the pre-sedimentation chamber of the second flue gas collection and treatment device is obtained. If the second flue gas temperature is lower than the second preset flue gas temperature, the combustion chamber of the third flue gas collection and treatment device is started to perform combustion to generate high-temperature flue gas. The high-temperature flue gas is treated in the mixing and denitrification device and then discharged into the second flue gas collection and treatment device to thereby increase the flue gas temperature of the second flue gas collection and treatment device, and the alkali ash powder spraying mechanism of the second flue gas collection and treatment device is operated to adjust the alkalinity of the flue gas.

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