Sintering emission reduction device based on flue gas circulation and pure oxygen combustion supporting

Abstract

The utility model discloses a sintering emission reduction device based on flue gas circulation and pure oxygen combustion supporting, which belongs to the technical field of sintering machines, and comprises a purification mechanism, a combustion-supporting mechanism and a combustion-supporting mechanism, a bottom hopper and a distributor are mounted at the top of the sintering machine; the mixing mechanism is used for receiving oxygen, coal gas and flue gas and mixing the oxygen, the coal gas and the flue gas to obtain mixed gas, the mixing mechanism comprises a mixing box, and a flue gas pipe, an oxygen pipe and a coal gas pipe are installed on the mixing box; the mixing box is communicated with a flue gas outlet of the purification mechanism through a coal gas pipe; and the gas distribution mechanism is used for extracting the mixed gas output by the mixing mechanism and guiding the mixed gas into the sintering machine. Smoke, oxygen and coal gas are input into the mixing box to be evenly mixed, smoke circulation and pure oxygen combustion supporting are combined, the heat utilization efficiency in the sintering process is effectively improved, the combustion efficiency is enhanced, and energy consumption and environment burden are effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sintering machine technical field, concretely relates to a kind of based on flue gas circulation and pure oxygen combustion-supporting sintering emission reduction device. BACKGROUND

[0002] Sintering machine is suitable for the sintering operation of large black metallurgical sintering plant, and it is the main equipment in the sintering process of induced draft, which can sinter different components and different particle size concentrate powder and rich ore powder into blocks, and partially eliminate harmful impurities such as sulfur and phosphorus contained in the ore. Through heating, the sintering machine makes the powder particles combine with each other to form a sintered body with certain strength and density. This process is mainly used for sintering iron ore, coke and other raw materials at high temperature to form blocks, but not generally used for sintering treatment of ceramic, metal powder and other materials. The sintering emission reduction device can reduce the emission of pollutants generated during sintering, and further improve the sintering efficiency by optimizing the sintering process.

[0003] In the Chinese patent with publication number CN221706184U, a sintering machine nitrogen oxide emission reduction device is mentioned. A support platform is arranged above the main body of the sintering machine to form a semi-closed structure, reducing the direct contact between the material and the external air. A combustion nozzle is arranged above the cooling section of the main body of the sintering machine. During the cooling process, the coal gas in the combustion pipe is ignited to consume the oxygen content in the air, thereby reducing the oxygen content in the air absorbed by the upper layer of the material, inhibiting the generation of nitrogen oxides, and reducing the amount of nitrogen oxides.

[0004] However, the device cannot efficiently recover the flue gas generated during sintering when in use, resulting in the waste heat and exhaust gas resources during sintering cannot be fully utilized. In addition, the direct discharge of high-temperature flue gas not only wastes valuable energy resources, but also causes significant energy loss. At the same time, due to the low efficiency of flue gas recovery, a large amount of fresh air is needed for the sintering process, which further increases energy consumption and environmental burden. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of based on flue gas circulation and pure oxygen combustion-supporting sintering emission reduction device, with the action of flue gas efficient recycling, to solve the problem of energy waste caused by direct discharge of high-temperature flue gas.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] The utility model aims at providing a kind of based on flue gas circulation and pure oxygen combustion-supporting sintering emission reduction device, comprising:

[0008] The purification mechanism is communicated with the flue gas discharge port of the sintering machine through the gas pipeline, and purifies the flue gas. The bottom hopper and the distributor are installed on the top of the sintering machine.

[0009] A mixing mechanism for receiving oxygen, coal gas and flue gas and mixing the three to obtain mixed gas, the mixing mechanism comprising a mixing box, a flue gas pipe, an oxygen pipe and a coal gas pipe being installed on the mixing box; the mixing box being communicated with a flue gas outlet of a purifying mechanism through the coal gas pipe;

[0010] A gas distribution mechanism for extracting the mixed gas output by the mixing mechanism and introducing the mixed gas into a sintering machine.

[0011] Preferably, the bottom end of the sintering machine is provided with M air suction boxes, M being a natural number greater than 0, the outlets of the M air suction boxes being connected with a flue pipe, the outlet of the flue pipe being connected with an inlet of a purifying mechanism.

[0012] Preferably, the purifying mechanism comprises a purifying box, a mounting plate being horizontally arranged in the purifying box, N filters being installed on the mounting plate, N being a natural number greater than 0; a flue gas outlet being arranged at the top of the purifying box, a desulfurization film and a denitration film being arranged above the filters.

[0013] Preferably, the filter comprises a connecting pipe, a connecting ring, a bag supporting frame and a filter bag, the connecting pipe being installed on the upper surface of the mounting plate, the connecting ring being installed on the connecting pipe, the bag supporting frame being installed on the upper end of the connecting ring, the filter bag being sleevedly installed on the outer surface of the bag supporting frame.

[0014] Preferably, a stirring mechanism is arranged in the mixing box, the flue gas pipe is of a T-shaped structure with two valves.

[0015] Preferably, the stirring mechanism comprises a stirring shaft and a driver driving the stirring shaft to perform a rotating motion, a stirring frame and stirring blades being installed on the side wall of the stirring shaft.

[0016] Preferably, the stirring shaft is horizontally installed in the mixing box.

[0017] Preferably, a plurality of turbulence holes are arranged in the side wall of the stirring frame.

[0018] Preferably, the gas distribution mechanism comprises:

[0019] an air suction pipe connected with the mixing mechanism;

[0020] L branch pipes connected with the sintering machine, L being a natural number greater than 0; wherein:

[0021] the air suction pipe is connected with the gas inlet of the branch pipe through a gas conveying pipe, an air suction pump being installed between the air suction pipe and the gas conveying pipe.

[0022] Preferably, each branch pipe is provided with Q gas distribution heads for gas outlet, Q being a natural number greater than 1.

[0023] Compared with the prior art, the utility model has the beneficial effects that:

[0024] (1) The utility model discloses a set of efficient mixing mechanism specially designed and arranged outside the sintering machine, which transports flue gas, oxygen and coal gas into a special mixing box through a series of carefully designed flue gas pipes, oxygen pipes and coal gas pipes. In the mixing box, a precise stirring mechanism starts to work, which is responsible for fully mixing and homogenizing these gases. This innovative process ingeniously combines flue gas circulation with pure oxygen combustion-supporting technology, not only significantly reduces the demand for fresh air, but also greatly improves the heat utilization efficiency in the sintering process. In addition, this combination also enhances combustion efficiency, effectively reduces energy consumption, and reduces the burden on the environment.

[0025] (2) The utility model discloses a set of gas distribution mechanism carefully designed and installed at the top end of the sintering machine, which will generate the necessary suction when the air suction pump starts. This suction enables the air suction pipe to extract the uniformly mixed gas from the mixing box and distribute these mixed gases uniformly to the inside of the sintering machine through multiple shunt pipes. This design realizes the efficient combination of circulating flue gas and pure oxygen, effectively reducing the demand for fresh air and further improving the heat utilization efficiency in the sintering process. At the same time, this combination also significantly improves the combustion efficiency, making the entire sintering process more energy-efficient and environmentally friendly.

[0026] (3) The utility model discloses a set of purification mechanism specially designed and installed at one end of the sintering machine, which guides the flue gas to be treated into a purification box through a flue pipe. In the purification box, the flue gas will pass through multiple carefully designed connecting pipes and enter multiple filter bags respectively. These filter bags can effectively remove particulate matter in the flue gas to ensure the cleanliness of the flue gas. Subsequently, the filtered flue gas will be further treated by desulfurization and denitrification membranes for desulfurization and denitrification, so that the recovered flue gas is subjected to appropriate purification treatment to meet environmental protection standards. This process not only promotes the recycling of flue gas, but also plays an active role in environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is one of the utility model's perspective drawings;

[0028] Figure 2 is the second perspective drawing of the utility model;

[0029] Figure 3 is the cross-sectional view of the mixing mechanism of the utility model;

[0030] Figure 4 is the perspective drawing of the stirring mechanism of the utility model;

[0031] Figure 5It is the perspective view of the air distribution mechanism of the utility model.

[0032] Figure 6 It is the sectional view of the purification mechanism of the utility model.

[0033] Figure 7 It is the explosion view of the filter of the utility model.

[0034] Figure 8 It is the connection diagram of the mounting plate and the multiple filters of the utility model.

[0035] In the figure: 1, sintering machine; 2, mixing mechanism; 3, air distribution mechanism; 4, support frame; 5, purification mechanism; 6, controller; 7, exhaust box; 8, flue pipe; 9, bottom hopper; 10, distributor;

[0036] 21, mixing box; 22, stirring mechanism; 23, flue gas pipe; 24, oxygen pipe; 25, coal gas pipe; 26, fixed block;

[0037] 221, stirring shaft; 222, stirring frame; 223, stirring blade; 224, driver;

[0038] 31, air suction pump; 32, air suction pipe; 33, gas conveying pipe; 34, shunt pipe; 35, air distribution head;

[0039] 51, purification box; 52, mounting plate; 53, filter; 54, sealing door; 55, desulfurization membrane; 56, denitration membrane;

[0040] 531, connecting pipe; 532, connecting ring; 533, bag supporting frame; 534, filter bag. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0042] Embodiment one:

[0043] Please refer to Figures 1 to 8 As shown in the figure, a sintering emission reduction device based on flue gas circulation and pure oxygen combustion support, comprising:

[0044] The purification mechanism 5 is connected to the flue gas outlet of the sintering machine 1 through a gas pipeline to purify the flue gas and ensure that the discharged gas meets environmental protection standards. At the top of the sintering machine 1, a bottom hopper 9 and a distributor 10 are installed to evenly lay the bottom material and mixed material in the sintering machine.

[0045] The mixing mechanism 2 is mainly used to receive oxygen, coal gas and flue gas treated by the purification mechanism 5 from different sources, and mix the three gases to obtain the required mixed gas. The mixing mechanism 2 includes a mixing box 21, on which a flue gas pipe 23, an oxygen pipe 24 and a coal gas pipe 25 are installed, which are responsible for delivering different types of gas into the mixing box. In addition, the mixing box 21 is connected to the flue gas outlet of the purification mechanism 5 through the coal gas pipe 25, ensuring that the source of the mixed gas is the purified flue gas.

[0046] The gas distribution mechanism 3 is used to extract the mixed gas output by the mixing mechanism 2 and evenly introduce the mixed gas into the sintering machine 1. Through the precise control of the gas distribution mechanism 3, the distribution of the mixed gas in the sintering machine can be ensured to be uniform, thereby improving the efficiency and quality of the sintering process.

[0047] Based on the above preferred embodiment, in order to better understand the concept of the present application, the components are described in detail as follows:

[0048] In the present application, the bottom end of the sintering machine 1 is carefully designed and installed with M number of suction boxes 7, where M represents a natural number greater than 0, indicating that the number of suction boxes can be adjusted according to actual needs. These suction boxes 7 are cleverly arranged below the sintering machine to ensure that they can effectively collect and process the flue gas generated from the sintering process. The outlet of each suction box 7 is connected to the flue pipe 8 to ensure that they can be smoothly connected to the flue pipe 8. The outlet of the flue pipe 8 is further connected to the inlet of the purification mechanism 5, so that the flue gas collected by the suction boxes is collected in the flue pipe 8.

[0049] In this application, the design of the purification mechanism 5 includes a purification box 51, which is the core part of the entire purification mechanism. Inside the purification box 51, a mounting plate 52 is horizontally arranged, which is an important structure for supporting and fixing other components. Then, N filters 53 are installed on the mounting plate 52, where N represents a natural number greater than 0, meaning that different numbers of filters can be installed according to actual needs to achieve the expected purification effect. In addition, a flue gas exhaust port is designed at the top of the purification box 51, which is responsible for discharging the purified flue gas, ensuring the continuity and efficiency of the purification process. In order to further improve the purification effect, desulfurization film 55 and denitration film 56 are specially set above the filter, which effectively filters sulfides and nitrides in flue gas respectively, greatly reducing the emission of harmful substances in flue gas and protecting the environment.

[0050] In this application, the design of the filter 53 includes multiple key components that work together to achieve high-efficiency filtration. Specifically, the filter 53 includes a connecting pipe 531 that is carefully designed and installed on the upper surface of the mounting plate 52, ensuring the stability and reliability of the filter. The upper end of the connecting pipe 531 is connected to a connecting ring 532, which not only serves as a fixing function but also provides a stable mounting platform for other parts of the filter. Then, a bag support 533 is installed at the upper end of the connecting ring 532, which is designed to provide sufficient support for the filter bag 534, ensuring that it maintains the appropriate shape and tension during the filtration process. Finally, the filter bag 534 is installed on the outer surface of the bag support 533, which is the core part of the filter and is responsible for capturing and collecting impurities in the filter medium, thereby ensuring the cleanliness of the filtered fluid. The entire design of the filter 53 takes into account the stability of the structure and the filtration efficiency, which can effectively prolong the service life of the filter and improve the filtration effect.

[0051] Inside the mixing box 21 of this application, a set of stirring mechanism 22 is specially designed to ensure that the gas in the mixing box can be fully and uniformly mixed. In addition, the flue gas pipe 23 adopts a T-shaped structure design with two valves, which can effectively control the flow direction and flow rate of the flue gas, ensuring the stability and safety of the mixing process.

[0052] The stirring mechanism 22 is one of the core components in the mixing box 21, which includes a stirring shaft 221 and a driver 224. The stirring shaft 221 is the main rotating component of the stirring mechanism 22, which is horizontally installed inside the mixing box 21. In order to enhance the stirring effect, multiple stirring frames 222 are installed on the side wall of the stirring shaft 221, and stirring blades 223 are fixed on these stirring frames 222. The stirring blades 223 are the parts that directly contact the gas, and they can effectively stir and mix the gas in the mixing box with the assistance of the stirring frames 222.

[0053] The horizontal installation of the stirring shaft 221 ensures the stability of the stirring process, and the multiple turbulence holes on the side wall of the stirring frame 222 further improve the stirring efficiency. These turbulence holes can make the material produce more turbulence during the stirring process, so that the mixing is more uniform, ensuring that the material in the mixing box 21 can achieve the expected mixing effect.

[0054] In this application, the structure and function of the gas distribution mechanism 3 are also crucial, which includes the following parts:

[0055] Firstly, the gas distribution mechanism 3 is connected with the mixing mechanism 2 through a specially designed suction pipe 32;

[0056] Secondly, the gas distribution mechanism 3 is also connected with the sintering machine 1 through L shunt pipes 34, where L represents a natural number greater than 0, which means that the number of shunt pipes can be adjusted according to actual needs;

[0057] Between the suction pipe 32 and the shunt pipe 34, the gas is connected through the gas conveying pipe 33 to ensure that the gas can smoothly flow from the suction pipe 32 to the shunt pipe 34. In order to ensure the efficiency of gas flow, a suction pump 31 is installed between the suction pipe 32 and the gas conveying pipe 33, which provides the necessary power to ensure that the gas can be effectively extracted from the mixing mechanism 2 and delivered to the shunt pipe 34.

[0058] In addition, each shunt pipe 34 is provided with Q gas distribution heads 35 for uniformly distributing the mixed gas to each part of the sintering machine 1. Here, Q represents a natural number greater than 1, meaning that each shunt pipe 34 is equipped with multiple gas distribution heads 35 to achieve more extensive gas distribution and more uniform gas distribution effect.

[0059] Working principle:

[0060] In the process of flue gas extraction, first of all, the bottom material needs to be evenly laid in the inside of the sintering machine 1 through the bottom material hopper 9, and then the mixed material is evenly covered on the bottom material by using the distributor 10. After completing these preparations, start the sintering machine 1 to start the sintering work. The flue gas generated in the sintering process will be transported to the purification mechanism 5 through the gas pipeline for the next purification treatment.

[0061] The function of the purification mechanism 5 is to purify the flue gas generated in the sintering machine 1. Through a series of purification steps, harmful substances in the flue gas can be effectively removed, environmental pollution can be reduced, and the discharged flue gas can meet the environmental protection standards.

[0062] In order to improve the combustion efficiency, it is necessary to mix the flue gas, oxygen and coal gas. This process is realized through the flue gas pipe 23, the oxygen pipe 24 and the coal gas pipe 25, which respectively transport the respective gases to the inside of the mixing box 21. In the mixing box 21, these gases are fully mixed to form a combustion-supporting mixed gas.

[0063] The recycling of the mixed gas is completed by the gas distribution mechanism 3. The gas distribution mechanism 3 is responsible for extracting the mixed gas in the mixing box 21 and introducing it into the sintering machine 1. In this way, the mixed gas can play its role in combustion support in the sintering machine 1, and the incompletely combusted gas can also be recycled again to improve the energy utilization efficiency.

[0064] Example two:

[0065] Please refer to Figures 1 to 8 As shown in the figure, a sintering emission reduction device based on flue gas circulation and pure oxygen combustion support, comprising:

[0066] The sintering machine 1;

[0067] The mixing mechanism 2 is installed on one side of the outer wall of the sintering machine 1, the gas distribution mechanism 3 is installed on the other side of the top end of the sintering machine 1, and two support frames 4 are installed at the bottom end of the sintering machine 1. The purification mechanism 5 is commonly installed between one end of the two support frames 4;

[0068] The mixing mechanism 2 includes a mixing box 21, a stirring mechanism 22, a flue gas pipe 23, an oxygen pipe 24, a coal gas pipe 25 and a fixed block 26. The stirring mechanism 22 is installed between the inner walls of the two sides of the mixing box 21. The flue gas pipe 23 and the fixed block 26 are both installed on one side of the outer wall of the mixing box 21, and the outer walls of the flue gas pipe 23 and the fixed block 26 are respectively installed on the outer walls of the purification mechanism 5 and the sintering machine 1. The oxygen pipe 24 is installed on one side of the top end of the mixing box 21, and the coal gas pipe 25 is installed on the other side of the outer wall of the mixing box 21.

[0069] By Figures 1 to 4It can be seen that the outer wall of the purification mechanism 5 is provided with the controller 6, the bottom end of the sintering machine 1 is provided with a plurality of air suction boxes 7, the bottom ends of the plurality of air suction boxes 7 are jointly provided with a flue pipe 8, one end of the flue pipe 8 is installed at the lower part of the other end of the purification mechanism 5, the upper part of one end of the sintering machine 1 is provided with a bottom hopper 9, and one side of the top end of the sintering machine 1 is provided with a distributor 10.

[0070] The stirring mechanism 22 comprises a stirring shaft 221, a plurality of stirring frames 222, a plurality of stirring blades 223 and a driver 224. The stirring shaft 221 is installed between the inner walls of the two sides of the mixing box 21 through bearings. The stirring frames 222 and the stirring blades 223 are both provided with a plurality of stirring frames 222 and a plurality of stirring blades 223. The plurality of stirring frames 222 are installed on one side of the outer surface of the stirring shaft 221, and the plurality of stirring blades 223 are installed on the other side of the outer surface of the stirring shaft 221. The driver 224 is installed at one end of the stirring shaft 221.

[0071] In summary, by opening the valve at the lower part of the flue gas pipe 23 and closing the valve at the upper part thereof, the flue gas filtered through the purification mechanism 5 is guided to the flue gas pipe 23 and then flows into the mixing box 21. At the same time, the valves on the oxygen pipe 24 and the gas pipe 25 are opened, and oxygen and gas are also input into the mixing box 21. At this time, the controller 6 controls the driver 224 to start, driving the stirring shaft 221 to rotate, and the plurality of stirring blades 223 and stirring frames 222 installed thereon to rotate. The stirring blades 223 first perform preliminary stirring on the flue gas, oxygen and gas, and then the stirring frames 222 perform secondary stirring. The plurality of turbulence holes on the stirring frames 222 help the uniform mixing of the gases, ensuring that the gases are fully and uniformly mixed. This process realizes the combination of flue gas circulation and pure oxygen combustion support. Flue gas circulation not only effectively reduces the demand for fresh air, but also fully utilizes the heat and useful components therein, promoting the sintering reaction. At the same time, the recovery and utilization of the waste heat in the sintering flue gas improve the heat utilization efficiency in the sintering process, reduce the dependence on external energy, and reduce production costs. It also avoids the energy loss caused by the direct emission of high-temperature flue gas, so that the circulating flue gas can stably and efficiently participate in the sintering process. The pure oxygen combustion support technology improves the combustion efficiency, making the fuel more fully utilized, stabilizing the oxygen supply in the sintering process, avoiding the problems of insufficient combustion and reduced sinter quality caused by insufficient oxygen, and enhancing the stability of the sintering process. This not only reduces fuel waste, but also reduces pollutant emissions in the sintering process, which is conducive to environmental protection, thereby effectively reducing energy consumption and environmental burden.

[0072] Specifically, referring to Figures 1 to 4 The stirring frames 222 are provided in a herringbone structure, and the outer wall of the stirring frame 222 is provided with a plurality of turbulence holes. The driver 224, the sintering machine 1 and the plurality of air suction boxes 7 are electrically connected with the controller 6. The flue gas pipe 23 is provided in a T-shaped structure with two valves. The oxygen pipe 24 and the gas pipe 25 are both provided with valves.

[0073] Therefore, the herringbone structure design can optimize the stirring effect, making the stirring frame 222 more uniform for gas stirring. The spoiler holes on the stirring frame 222 can change the flow direction of the gas, further promoting the uniform mixing of the gas. The electrical connection facilitates the controller 6 to uniformly manage and control each device. The T-shaped structure facilitates the shunting or discharge of flue gas. The two valves can control the flow path of the flue gas in the flue gas pipe 23. The valves on the oxygen pipe 24 and the gas pipe 25 are used to control the flow of oxygen and gas.

[0074] Example Three:

[0075] Referring to Figure 5 , the gas distribution mechanism 3 is composed of an air suction pump 31, an air suction pipe 32, a gas conveying pipe 33, a shunt pipe 34, and a gas distribution head 35. The air suction pump 31 is installed at the top of the sintering machine 1, and the air suction pipe 32 is fixed to the outer wall of the air suction pump 31 and connected to the top of the mixing box 21. One end of the gas conveying pipe 33 is connected to the air suction pump 31, and the shunt pipe 34 and the gas distribution head 35 are both configured with multiple. The bottom end of the shunt pipe 34 is connected to the bottom of the gas conveying pipe 33, and the gas distribution head 35 is installed at the bottom end of the shunt pipe 34.

[0076] Therefore, the controller 6 starts the air suction pump 31 to generate suction in the air suction pipe 32, thereby extracting the mixed gas from the mixing box 21. Then, the mixed gas is distributed to the shunt pipe 34 through the gas conveying pipe 33, and finally the gas distribution head 35 uniformly sprays the mixed gas, ensuring that the mixed gas is evenly distributed in the sintering machine 1, achieving efficient combustion. This process optimizes the sintering process, improves the sintering efficiency and the overall productivity of the production line. At the same time, this technology recovers energy by utilizing the waste heat in the flue gas, reducing the energy consumption of the sintering process. The combination of circulating flue gas and pure oxygen combustion, as well as the application of efficient combustion and waste heat utilization technology, fully utilizes the energy in the flue gas, improves the energy efficiency of the sintering process, and reduces production costs. In addition, this technology also significantly improves the heat utilization efficiency and combustion efficiency, thereby greatly enhancing the energy saving and emission reduction effect of the sintering process.

[0077] Referring to Figure 5 , the air suction pump 31 is electrically connected to the controller 6, and the outer surface of the gas distribution head 35 is located inside the sintering machine 1.

[0078] Therefore, by realizing the electrical connection between the air suction pump 31 and the controller 6, the controller 6 can remotely control the air suction pump 31, ensuring that the mixed gas can be evenly distributed inside the sintering machine 1, thereby improving the sintering efficiency.

[0079] Example Four:

[0080] Referring to Figures 6 to 8The purifying mechanism 5 is composed of a purifying box 51, a mounting plate 52, filters 53, a sealing door 54, a desulfurization membrane 55 and a denitration membrane 56. The purifying box 51 is arranged at the lower part of one end of the sintering machine 1, and the mounting plate 52 is fixed to the lower part of the inner wall of both sides of the purifying box 51. The filters 53 are composed of multiple filters, and are all installed at the top end of the mounting plate 52. The sealing door 54 is arranged at one end of the purifying box 51, and the desulfurization membrane 55 and the denitration membrane 56 are respectively installed at the upper part of the inner wall of both sides of the purifying box 51.

[0081] The filter 53 comprises a connecting pipe 531, a connecting ring 532, a bag supporting frame 533 and a filter bag 534. The connecting pipe 531 is fixed to the top end of the mounting plate 52, and the connecting ring 532 is installed at the upper part of the outer side of the connecting pipe 531. The bag supporting frame 533 is located at the top end of the connecting ring 532, and the filter bag 534 is sleeved on the outer side of the bag supporting frame 533.

[0082] Accordingly, during the operation, the bottom hopper 9 first spreads the bottom material uniformly in the sintering machine 1, and then the distributor 10 uniformly covers the mixed material on the bottom material. The controller 6 is started immediately to command the igniter inside the sintering machine 1 to ignite the sintering material, so as to start the sintering operation. At the same time, the controller 6 is also responsible for starting multiple exhaust boxes 7 to forcibly exhaust the inside of the sintering machine 1. This process not only helps to exhaust the gas and impurities, but also promotes the densification of the sintering block. The extracted flue gas is collected to the flue pipe 8 and transported to the bottom of the purifying box 51. Here, the flue gas passes through multiple connecting pipes 531 and is distributed into multiple filter bags 534 supported by multiple bag supporting frames 533. These filter bags 534 can effectively remove particulate matter in the flue gas. The flue gas after preliminary filtration continues to be treated by desulfurization and denitration through the desulfurization membrane 55 and the denitration membrane 56. This series of purification processes ensures that the recovered flue gas is properly treated, realizes the recovery of high-efficiency flue gas, and promotes the recycling of flue gas. When it is necessary to replace the filter bag 534, the operator only needs to open the sealing door 54, rotate the connecting ring 532, and easily remove it from the connecting pipe 531, and then disassemble the bag supporting frame 533 and the filter bag 534 thereon for replacement.

[0083] Referring to Figures 6 to 8 The outer side of the connecting pipe 531 is provided with a spiral thread, the distance between the top end surface of the filter bag 534 and the bottom end surface of the desulfurization membrane 55 is greater than the height of the connecting ring 532, and the filter bag 534 adopts a PTFE coated filter bag.

[0084] Therefore, the spiral thread design is conducive to the connection between the connecting pipe 531 and the connecting ring 532, improves the stability and sealing performance of the connection, and facilitates the disassembly and replacement of the filter bag 534. The PTFE coated filter bag has excellent corrosion resistance, high temperature resistance and filtering efficiency.

[0085] A sintering emission reduction method based on flue gas circulation and pure oxygen combustion support, the steps are as follows:

[0086] First, smoke extraction: the bottom material is evenly laid in the sintering machine 1 through the bottom hopper 9, and then the mixed material is evenly laid on the bottom material by the distributor 10. Start the sintering machine 1 to perform sintering work, at this time, the induced draft box 7 starts forced draft to promote the densification of the sintering block. Finally, the flue gas is introduced into the purification mechanism 5 through the flue pipe 8;

[0087] Second, smoke purification: after the flue gas flows into the purification box 51, it enters the connecting pipe 531, and the particulate matter in the flue gas is effectively removed by the filter bag 534. Then, the flue gas is subjected to desulfurization and denitrification treatment by the desulfurization film 55 and the denitrification film 56 to reduce the pollutant concentration in the flue gas and ensure that the quality of the recovered flue gas meets the standard for reuse;

[0088] Third, mixed combustion support: the flue gas, oxygen and coal gas are respectively input into the inside of the mixing box 21 through the flue gas pipe 23, the oxygen pipe 24 and the coal gas pipe 25. Start the driver 224 to drive the multiple stirring frames 222 and the multiple stirring blades 223 to rotate, so that the flue gas is uniformly mixed with oxygen and coal gas, realizing the recycling of flue gas. This process can effectively utilize the waste heat and exhaust gas in the sintering process, reduce energy consumption, and achieve efficient combustion combined with pure oxygen combustion support;

[0089] Finally, flue gas circulation: start the air pump 31 to extract the mixed gas and input it into multiple shunt pipes 34, and then uniformly distribute the mixed gas to the upper part of the sintering machine 1 through multiple air distribution heads 35. Through the circulating flue gas, the demand for fresh air can be effectively reduced, the heat utilization efficiency in the sintering process can be improved, and pure oxygen can be used as a combustion support to improve the combustion efficiency.

[0090] Application example:

[0091] The present scheme is mainly applicable to the fields of steel smelting, non-ferrous metal smelting (such as copper, aluminum, etc.), cement manufacturing, and other industrial production involving high-temperature sintering processes. In the process of steel smelting, the sintering process is a key link in the production of iron ore for blast furnaces; in the process of non-ferrous metal smelting, there is also a high-temperature sintering link; and in the production of cement clinker, the rotary kiln sintering is a crucial step. The present scheme efficiently recovers and purifies the flue gas generated during the sintering process through the purification mechanism 5, removes the pollutants therein, and ensures that the quality of the recovered flue gas meets the recycling standards. Subsequently, the purified flue gas is mixed with pure oxygen and coal gas through the mixing mechanism 2, and is fully mixed through the mixing mechanism 2 to improve the combustion efficiency. The pure oxygen combustion-supporting technology can significantly increase the flame temperature and combustion speed, thereby promoting the progress of the sintering process. At the same time, the present scheme also recovers energy using the waste heat in the flue gas, effectively reducing the energy consumption of the sintering process. The mixed gas is uniformly distributed inside the sintering machine 1 through the gas distribution mechanism 3, optimizing the sintering process and improving the sintering efficiency, thereby improving the overall productivity of the production line. Through the combined application of flue gas circulation and pure oxygen combustion-supporting technology, the present scheme significantly reduces the energy consumption and pollutant emissions in the sintering process, which is conducive to environmental protection and sustainable development. In addition, the adoption of efficient combustion and waste heat utilization technology can fully utilize the energy in the flue gas, further improving the energy efficiency of the sintering process and reducing production costs.

[0092] Although the embodiments of the present application have been shown and described, it is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A sintering emission reduction device based on flue gas circulation and pure oxygen combustion support, characterized in that, It includes: The purification mechanism (5) is communicated with the flue gas outlet of the sintering machine (1) through the gas pipeline, and the flue gas is purified; The bottom hopper (9) and the distributor (10) are installed on the top of the sintering machine (1); The mixing mechanism (2) is used for receiving oxygen, coal gas and flue gas, and mixing the three to obtain mixed gas, the mixing mechanism (2) includes a mixing box (21), a flue gas pipe (23), an oxygen pipe (24) and a coal gas pipe (25) are installed on the mixing box (21); the mixing box (21) is communicated with the flue gas outlet of the purification mechanism (5) through the coal gas pipe (25); The gas distribution mechanism (3) is used for extracting the mixed gas output by the mixing mechanism (2) and introducing the mixed gas into the sintering machine (1).

2. The sintering emission reduction device based on flue gas circulation and pure oxygen combustion support according to claim 1, characterized in that: The bottom end of the sintering machine (1) is provided with M air extraction boxes (7), M is a natural number greater than 0, the outlets of the M air extraction boxes (7) are connected with the flue pipe (8), and the outlet of the flue pipe (8) is connected with the inlet of the purification mechanism (5).

3. The sintering emission reduction device based on flue gas circulation and pure oxygen combustion support according to claim 1 or 2, characterized in that: The purification mechanism (5) includes a purification box (51), a mounting plate (52) is horizontally arranged in the purification box (51), N filters (53) are installed on the mounting plate (52), N is a natural number greater than 0; a flue gas outlet is arranged at the top of the purification box (51), and a desulfurization film (55) and a denitration film (56) are arranged above the filter.

4. The sintering emission reduction device based on flue gas circulation and pure oxygen combustion support according to claim 3, characterized in that: The filter (53) includes a connecting pipe (531), a connecting ring (532), a bag supporting frame (533) and a filter bag (534), the connecting pipe (531) is installed on the upper surface of the mounting plate (52), the connecting ring (532) is installed on the connecting pipe (531), the bag supporting frame (533) is installed on the upper end of the connecting ring (532), and the filter bag (534) is sleevedly installed on the outer surface of the bag supporting frame (533).

5. The sintering emission reduction device based on flue gas circulation and pure oxygen combustion support according to claim 1, characterized in that: The mixing box (21) is provided with a stirring mechanism (22), and the flue gas pipe (23) is a T-shaped structure with two valves.

6. The sintering emission reduction device based on flue gas circulation and pure oxygen combustion support according to claim 5, characterized in that: The stirring mechanism (22) includes a stirring shaft (221) and a driver (224) for driving the stirring shaft (221) to perform rotary motion, a stirring frame (222) and stirring blades (223) are installed on the side wall of the stirring shaft (221).

7. The sintering emission reduction device based on flue gas circulation and pure oxygen combustion support according to claim 6, characterized in that: The stirring shaft (221) is horizontally installed in the mixing box (21).

8. The sintering emission reduction device based on flue gas circulation and pure oxygen combustion support according to claim 6, characterized in that: A plurality of turbulence holes are formed in the side wall of the stirring frame (222).

9. The sinter emission reduction device based on flue gas circulation and pure oxygen combustion support according to claim 1, characterized in that: The gas distribution mechanism (3) includes: The gas extraction pipe (32) is connected with the mixing mechanism (2); L branch pipes (34) are connected with the sintering machine (1), L is a natural number greater than 0; wherein: The gas extraction pipe (32) is connected with the gas inlet of the branch pipe (34) through the gas pipeline (33), and a gas extraction pump (31) is installed between the gas extraction pipe (32) and the gas pipeline (33).

10. The sinter emission reduction device based on flue gas circulation and pure oxygen combustion support according to claim 9, characterized in that: Each branch pipe (34) is provided with Q gas distribution heads (35) for gas outlet, Q is a natural number greater than 1.

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