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

Abstract

The invention discloses a sintering emission reduction method based on flue gas circulation and pure oxygen combustion supporting, which belongs to the technical field of sintering machines, and comprises the following steps: extracting flue gas: uniformly spreading a bottom material in a sintering machine through a bottom hopper, uniformly spreading a mixture on the bottom material through a distributor, and then starting the sintering machine for sintering, flue gas in the sintering machine is input into the purification mechanism through the gas conveying pipeline. Purifying the flue gas: purifying the flue gas by using a purifying mechanism; flue gas, oxygen and coal gas are input into a mixing box through a flue gas pipe, an oxygen pipe and a coal gas pipe to be mixed; and flue gas circulation: extracting the mixed gas in the mixing box by the gas distribution mechanism, and introducing the mixed gas into the sintering machine. Flue gas, oxygen and coal gas are guided into the mixing box to be evenly mixed, flue gas circulation and a pure oxygen combustion-supporting technology are combined, the heat energy utilization efficiency in the sintering process is remarkably improved, the combustion efficiency is enhanced, and energy consumption and environmental influences are effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of sintering machines, and in particular relates to a sintering emission reduction method based on flue gas circulation and pure oxygen combustion. Background Art

[0002] The sintering machine, which is suitable for large-scale ferrous metallurgical sintering plants, is the core equipment in the exhaust sintering process. It can sinter concentrate powder and rich ore powder of various compositions and different particle sizes into blocks, while partially removing harmful impurities such as sulfur and phosphorus in the ore. Through heating, the sintering machine combines the powder particles with each other to form a sintered body with a certain strength and density. This process is mainly used to sinter raw materials such as iron ore and coke into blocks at high temperatures, and is not widely used in the sintering treatment of materials such as ceramics and metal powders. The sintering emission reduction device can reduce the emission of pollutants generated during the sintering process and further improve the sintering efficiency by optimizing the sintering process.

[0003] However, when using traditional technology, there is a significant problem, that is, the flue gas generated during the sintering process cannot be efficiently recovered. This leads to the inability to fully utilize the waste heat and waste gas resources in the sintering process, resulting in waste of energy resources and energy loss. In addition, due to the low efficiency of flue gas recovery, a large amount of fresh air is also required in the sintering process, which not only increases energy consumption, but also brings additional burden to the environment. The direct emission of high-temperature flue gas not only wastes precious energy resources, but also causes significant energy losses. At the same time, due to the low efficiency of flue gas recovery, a large amount of fresh air is also required in the sintering process, which further increases energy consumption and environmental burden. Summary of the invention

[0004] The purpose of the present invention is to provide a sintering emission reduction method based on flue gas circulation and pure oxygen combustion, which has the function of efficiently recycling flue gas and aims to solve the problem of energy waste caused by direct emission of high-temperature flue gas.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The object of the present invention is to provide a sintering emission reduction method based on flue gas circulation and pure oxygen combustion, comprising:

[0007] Extracting flue gas: The bottom material is evenly spread in the sintering machine through the bottom material hopper, and the mixed material is evenly spread on the bottom material through the distributor, and then the sintering machine is started to perform sintering work. The flue gas in the sintering machine is input into the purification mechanism through the gas pipeline;

[0008] Purify flue gas: use purification mechanism to purify flue gas;

[0009] Mixing and combustion-supporting: The flue gas, oxygen and gas are respectively introduced into the mixing box through the flue gas pipe, oxygen pipe and gas pipe for mixing;

[0010] Flue gas circulation: The gas distribution mechanism extracts the mixed gas in the mixing box and introduces the mixed gas into the sintering machine.

[0011] Preferably, before extracting flue gas, first install M exhaust boxes at the bottom end of the sintering machine, where M is a natural number greater than 0, connect the outlets of the M exhaust boxes to the flue pipe, and connect the outlet of the flue pipe to the inlet of the purification mechanism.

[0012] Preferably, before purifying the flue gas, a purification mechanism is designed. First, a purification box with a sealed structure is designed. Then, a mounting plate is horizontally arranged in the purification box. Subsequently, N filters are installed on the mounting plate, where N is a natural number greater than 0. A flue gas outlet is arranged on the top of the purification box. Finally, a desulfurization membrane and a denitrification membrane are arranged above the filters.

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

[0014] Preferably, before mixing and combustion-supporting, a stirring mechanism is provided in the mixing box for stirring and mixing the flue gas, oxygen and coal gas in the mixing box, and the flue gas pipe is a T-shaped structure with two valves.

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

[0016] Preferably, the stirring shaft is horizontally installed in the mixing box, and a plurality of spoiler holes are opened on the side wall of the stirring frame.

[0017] Preferably, before the flue gas circulates, a gas distribution mechanism is constructed, specifically comprising:

[0018] Connect one end of the air extraction pipe to the air outlet of the mixing mechanism;

[0019] Install a vacuum pump at the other end of the vacuum pipe;

[0020] Connect the air outlet of the vacuum pump to the air inlet of the air pipe;

[0021] Connect the air inlets of L diversion pipes to the side wall of the gas transmission pipe;

[0022] Q gas distribution heads are installed on the side wall of each shunt pipe, where Q is a natural number greater than 1;

[0023] The outlet of the gas distribution head is located inside the sintering machine.

[0024] Preferably, an electric-controlled valve is installed on each gas transmission pipeline, and the controller is connected to each electric-controlled valve via a data line.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention specially designs and installs a set of efficient mixing mechanisms outside the sintering machine, and transports the flue gas, oxygen and coal gas to 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 cleverly combines flue gas circulation with pure oxygen combustion technology, which not only significantly reduces the demand for fresh air, but also greatly improves the heat utilization efficiency during the sintering process. In addition, this combination also enhances combustion efficiency, effectively reduces energy consumption, and reduces the burden on the environment.

[0027] The present invention has carefully designed and installed a set of gas distribution mechanisms at the top of the sintering machine. When the vacuum pump is started, the necessary suction force is generated. This suction force enables the vacuum pipe to extract the evenly mixed gas from the mixing box and evenly distribute the mixed gas to the inside of the sintering machine through multiple diversion pipes. This design realizes the efficient combination of circulating flue gas and pure oxygen, thereby effectively reducing the demand for fresh air and further improving the heat utilization efficiency during the sintering process. At the same time, this combination also significantly improves the combustion efficiency, making the entire sintering process more energy-saving and environmentally friendly.

[0028] The present invention specially designs and installs a set of purification mechanism at one end of the sintering machine, and 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 a plurality of carefully designed connecting pipes and enter a plurality of 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 desulfurized and denitrated through a desulfurization membrane and a denitrification membrane, so that the recovered flue gas is properly purified and meets environmental protection standards. This process not only promotes the recycling and reuse of flue gas, but also plays a positive role in environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A flowchart of a preferred embodiment of the present invention;

[0030] Figure 2 A first-view stereogram of a preferred embodiment of the present invention;

[0031] Figure 3 A second perspective stereogram of a preferred embodiment of the present invention;

[0032] Figure 4 A cross-sectional view of a mixing mechanism in a preferred embodiment of the present invention;

[0033] Figure 5 A three-dimensional diagram of a stirring mechanism in a preferred embodiment of the present invention;

[0034] Figure 6 A three-dimensional diagram of the air distribution mechanism in a preferred embodiment of the present invention;

[0035] Figure 7 A cross-sectional view of a purification mechanism in a preferred embodiment of the present invention;

[0036] Figure 8 An exploded view of a filter in a preferred embodiment of the present invention;

[0037] Fig. 9 This is a connection diagram between a mounting plate and multiple filters in a preferred embodiment of the present invention.

[0038] In the figure: 1. sintering machine; 2. mixing mechanism; 3. gas distribution mechanism; 4. support frame; 5. purification mechanism; 6. controller; 7. exhaust box; 8. flue pipe; 9. bottom hopper; 10. distributor;

[0039] 21. Mixing box; 22. Stirring mechanism; 23. Smoke pipe; 24. Oxygen pipe; 25. Gas pipe; 26. Fixing block;

[0040] 221, stirring shaft; 222, stirring frame; 223, stirring blade; 224, driver;

[0041] 31. Air pump; 32. Air extraction pipe; 33. Air delivery pipe; 34. Diverter pipe; 35. Air distribution head;

[0042] 51. Purification box; 52. Mounting plate; 53. Filter; 54. Sealing door; 55. Desulfurization membrane; 56. Denitrification membrane;

[0043] 531. Connecting pipe; 532. Connecting ring; 533. Bag support frame; 534. Filter bag. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Embodiment 1:

[0046] See also Figure 1 As shown, a sintering emission reduction method based on flue gas circulation and pure oxygen combustion-assisted combustion includes:

[0047] Extracting flue gas: In the process of extracting flue gas, firstly, the bottom material needs to be evenly spread inside the sintering machine 1 through the bottom material hopper 9 to ensure that the bottom material is properly distributed. Then, the distributor 10 starts to work and evenly spreads the mixed material on the already laid bottom material. After completing these preparatory works, start the sintering machine 1 and start the sintering work. The flue gas generated during the sintering process will be transported to the purification mechanism 5 through the gas pipeline for the next step of treatment;

[0048] Purify flue gas: The purification mechanism 5 is used to purify the flue gas; the purification mechanism 5 is used to purify the flue gas generated by the sintering machine 1. Through a series of purification steps, harmful substances in the flue gas are removed to meet environmental emission standards. The efficiency and effect of the purification process directly affect the environmental performance of the entire production process;

[0049] Mixing and combustion-supporting: The flue gas, oxygen and coal gas are respectively fed into the mixing box 21 through the flue gas pipe 23, the oxygen pipe 24 and the coal gas pipe 25 for mixing; in the mixing and combustion-supporting process, the flue gas, oxygen and coal gas are respectively fed into the mixing box 21 through the flue gas pipe 23, the oxygen pipe 24 and the coal gas pipe 25. In the mixing box 21, the three gases will be fully mixed to form a mixed gas suitable for the sintering process;

[0050] Flue gas circulation: The gas distribution mechanism 3 extracts the mixed gas in the mixing box 21 and introduces the mixed gas into the sintering machine 1. After the mixed gas is prepared, the gas distribution mechanism 3 starts to work, which is responsible for extracting the mixed gas in the mixing box 21 and introducing the gas into the sintering machine 1. In this way, the mixed gas is circulated in the sintering machine 1, which not only improves the energy utilization efficiency, but also ensures the continuity and stability of the sintering process.

[0051] In order to better understand the concept of the present invention, the following is a detailed description:

[0052] Before starting the process of extracting flue gas, it is necessary to first install M exhaust boxes 7 at the bottom of the sintering machine 1, where M represents a natural number greater than 0. This step is crucial. Next, the outlet parts of the M exhaust boxes 7 need to be connected to the flue pipe 8. After completing these connections, the last step is to connect the outlet end of the flue pipe 8 to the inlet end of the purification mechanism 5, thus completing the construction of the entire flue gas extraction system.

[0053] Before purifying the flue gas, it is first necessary to design a purification mechanism 5. The design process of this mechanism includes several key steps. First, a purification box 51 with a sealed structure is designed. This purification box is the core part of the entire purification mechanism and is responsible for accommodating all purification components. Then, a mounting plate 52 is horizontally set inside the purification box 51, and this mounting plate will serve as a support structure for the filter. On the mounting plate 52, N filters 53 are installed according to the design requirements. Here, N represents a natural number greater than 0, which means that one or more filters can be installed according to actual needs to achieve the desired purification effect. At the top of the purification box 51, a flue gas outlet is set, which is the channel for the purified flue gas to be discharged. Finally, above the filter, a desulfurization membrane 55 and a denitrification membrane 56 are respectively set. These two membranes are responsible for removing sulfides and nitrogen oxides in the flue gas, further purifying the flue gas, and ensuring that the discharged flue gas meets environmental protection standards.

[0054] In the present invention, the design of the filter 53 includes a plurality of key components that work together to achieve an effective filtering function. Specifically, the filter 53 includes a connecting tube 531, which is carefully designed and mounted on the upper surface of the mounting plate 52, ensuring the stability and reliability of the filter. A connecting ring 532 is connected to the upper end of the connecting tube 531, which not only plays a fixing role, but also provides convenience for the further assembly of the filter. Next, a bag support frame 533 is installed on the upper end of the connecting ring 532. The design of the bag support frame 533 is intended to provide a sturdy support structure for the filter bag 534, ensuring that the filter bag can be correctly sleeved and maintained in the proper position. Finally, the filter bag 534 is sleeved and mounted on the outer surface of the bag support frame 533. The filter bag is the core part of the filter, which is responsible for capturing and retaining impurities in the filter medium, thereby ensuring the high efficiency of the filtering effect. The design of the entire filter 53 takes into account the stability of the structure, the convenience of operation and the filtering efficiency, reflecting the innovation and practicality of the present invention in the field of filtering technology.

[0055] Before the process of mixing and supporting combustion begins, a stirring mechanism 22 is first provided in the mixing box 21. The main function of the stirring mechanism 22 is to fully stir and mix the flue gas, oxygen and coal gas in the mixing box 21 to ensure that these gases can be evenly mixed together. To achieve this purpose, the flue gas pipe 23 is designed as a T-shaped structure with two valves, so that the flow of the flue gas can be easily controlled.

[0056] The stirring mechanism 22 is designed to include a stirring shaft 221 and a driver 224. The driver 224 is used to drive the stirring shaft 221 to perform a rotational motion. In order to improve the stirring efficiency, a plurality of stirring racks 222 are installed on the side wall of the stirring shaft 221, and a plurality of stirring blades 223 are installed on these stirring racks 222. The shape and arrangement of the stirring blades 223 are carefully designed to ensure that sufficient turbulence effect can be generated during the stirring process, so that the gas in the mixing box 21 can be mixed more evenly.

[0057] In order to ensure that the stirring mechanism 22 can operate stably, the stirring shaft 221 is horizontally installed in the mixing box 21. In addition, a plurality of spoiler holes are opened on the side wall of the stirring frame 222, and these spoiler holes are designed to further enhance the stirring effect, making the flow of gas in the mixing box 21 more complex and uniform, thereby achieving a better mixing effect.

[0058] Before implementing the steps of flue gas circulation, it is necessary to first construct a gas distribution mechanism 3. The construction steps of this mechanism specifically include:

[0059] First, one end of the air extraction pipe 32 is precisely connected to the air outlet of the mixing mechanism 2 to ensure the sealing between the two so as to facilitate the smooth progress of the subsequent process;

[0060] Next, an air pump 31 is installed at the other end of the air extraction pipe 32. The installation position of the air pump 31 needs to take into account the air extraction efficiency and the stability of the equipment to ensure the efficient operation of the entire system.

[0061] Then, the air outlet of the air pump 31 is connected to the air inlet of the air delivery pipe 33. During this connection process, it is necessary to ensure that the connection parts are firm and sealed to avoid gas leakage.

[0062] On the side wall of the gas delivery pipe 33, it is necessary to connect the gas inlets of L branch pipes 34, and these branch pipes 34 will be responsible for evenly distributing the gas to each gas distribution head 35;

[0063] For each manifold 34, Q gas distribution heads 35 need to be installed on its side wall, where Q is a natural number greater than 1. Such a design can ensure that the gas can be evenly distributed in various areas of the sintering machine 1;

[0064] Finally, ensure that the outlet position of the gas distribution head 35 is correctly set inside the sintering machine 1 so that the gas can effectively act on the sintering process and improve the sintering efficiency and quality.

[0065] In order to achieve precise control of the gas pipeline, the present invention adopts the measure of installing electric control valves on each gas pipeline. These electric control valves are carefully designed so that they can respond to remote commands, thereby achieving fine management of the airflow. As the hub of the entire system, the controller is closely connected to each electric control valve through a data line to ensure the fast and accurate transmission of commands. Using this advanced controller, the gas source on each gas pipeline can be controlled on and off, and the size of the airflow can be adjusted to meet the needs of different situations. This on-demand control method not only improves the efficiency of energy use, but also enhances the flexibility and reliability of the entire gas transmission system.

[0066] See also Figures 2 to 9 As shown, the whole method is realized by a device of the following structure, which includes a sintering machine 1 and a mixing mechanism 2; one side of the outer wall of the sintering machine 1 is designed to be installed with the mixing mechanism 2, and the other side of the top of the sintering machine 1 is designed to be installed with the gas distribution mechanism 3. In addition, two support frames 4 are installed at the bottom of the sintering machine 1, and a purification mechanism 5 is installed between one end of the two support frames 4;

[0067] The mixing mechanism 2 is composed of multiple parts, mainly including a mixing box 21, a stirring mechanism 22, a flue gas pipe 23, an oxygen pipe 24, a gas pipe 25 and a fixing block 26. The stirring mechanism 22 is installed between the inner walls on both sides of the mixing box 21 to ensure the uniformity of the mixing process. The flue gas pipe 23 and the fixing block 26 are both installed on the outer wall of one side of the mixing box 21, wherein the outer walls of the flue gas pipe 23 and the fixing block 26 are respectively designed to be installed on the outer walls of the purification mechanism 5 and the sintering machine 1 to achieve effective treatment of flue gas and stable fixation of the equipment. The oxygen pipe 24 is installed on one side of the top of the mixing box 21 to facilitate the input and control of oxygen. The gas pipe 25 is installed on the outer wall of the other side of the mixing box 21 to ensure a stable supply and safe use of gas.

[0068] according to Figures 2 to 5 From the detailed display, it can be clearly seen that the outer wall of the purification mechanism 5 is equipped with a controller 6. In addition, a plurality of exhaust boxes 7 are installed in the bottom area of ​​the sintering machine 1, and the bottoms of these exhaust boxes 7 are connected to each other to form an integrated ventilation system. At the bottom of these exhaust boxes 7, a flue pipe 8 is also installed together, one end of which extends and is fixed to the lower position of the other end of the purification mechanism 5. At the upper part of one end of the sintering machine 1, a bottom hopper 9 is provided for storing and supplying raw materials. On the top side of the sintering machine 1, we can also see the installation of a distributor 10, which is responsible for evenly distributing the raw materials on the working surface of the sintering machine.

[0069] The stirring mechanism 22 includes a stirring shaft 221, a stirring frame 222, a stirring blade 223 and a driver 224. The stirring shaft 221 is the core component of this mechanism. It is installed between the inner walls of the two sides of the mixing box 21 through a precision bearing to ensure the stability and durability of the stirring shaft. The stirring frame 222 and the stirring blade 223 are the components responsible for the actual stirring work in the stirring mechanism. They are designed in multiples to ensure the uniformity and efficiency of the stirring effect. Multiple stirring frames 222 are evenly installed on one side of the outer surface of the stirring shaft 221, and their layout is carefully designed to provide the best stirring effect. Similarly, multiple stirring blades 223 are also evenly installed on the other side of the outer surface of the stirring shaft 221. They work together with the stirring frame 222 to complete the task of mixing materials. The driver 224 is the power source of the stirring mechanism. It is installed at one end of the stirring shaft 221 and drives the stirring shaft to rotate through a motor or other power device, thereby driving the stirring frame and the stirring blade to mix efficiently. The design of the entire stirring mechanism 22 fully considers various factors in the stirring process to ensure that the materials in the mixing box can be mixed evenly and thoroughly.

[0070] From the above analysis, it can be seen that by accurately controlling the valve operation of the flue gas pipe 23, the flue gas treated by the purification mechanism 5 can be effectively guided into the flue gas pipe 23 and flow to the mixing box 21. At the same time, the valves on the oxygen pipe 24 and the gas pipe 25 are opened to allow oxygen and gas to enter the mixing box 21. At this time, the controller 6 begins to play a role, and it directs the driver 224 to start and drive the stirring shaft 221 to rotate. The stirring shaft 221 is equipped with a plurality of stirring blades 223 and a stirring frame 222, which perform two stirring actions during rotation. First, the stirring blades 223 perform a preliminary mixing of the flue gas, oxygen and gas, and then the stirring frame 222 performs a second stirring. The turbulent holes on it help to mix the gases evenly and ensure the adequacy of the gas mixing. This process combines flue gas circulation with pure oxygen combustion-supporting technology. The flue gas circulation technology not only reduces the demand for fresh air, but also utilizes the heat and useful components in the flue gas to promote the sintering reaction. At the same time, by recycling and utilizing the waste heat in the sintering flue gas, the heat utilization efficiency of the sintering process is improved, the dependence on external energy is reduced, the production cost is reduced, and the energy loss caused by the direct emission of high-temperature flue gas is avoided. The circulating flue gas can participate in the sintering process stably and efficiently, while the pure oxygen combustion-supporting technology improves the combustion efficiency, ensures the full combustion of the fuel, stabilizes the oxygen supply during the sintering process, avoids the problems of incomplete combustion and the decline of the quality of the sintered ore, and enhances the stability of the sintering process. This not only reduces the waste of fuel, but also reduces the emission of pollutants generated during the sintering process, is beneficial to environmental protection, and effectively reduces energy consumption and environmental burden.

[0071] Specifically, if Figures 2 to 5As shown, the stirring rack 222 is designed into a unique herringbone structure. This design is not only beautiful, but also has significant functional advantages. A plurality of spoiler holes are carefully opened on the outer wall of the stirring rack 222, and the existence of these holes is crucial to the gas stirring process. They can effectively change the flow direction of the gas, thereby promoting uniform mixing between the gases and further optimizing the stirring effect. In addition, the driver 224, the sintering machine 1 and the plurality of exhaust boxes 7 are electrically connected to the controller 6. This connection method enables the controller 6 to uniformly manage and control these key devices to ensure the efficiency and stability of the entire stirring process.

[0072] In terms of flue gas treatment, the flue gas pipe 23 is designed as a T-shaped structure with two valves. This structural design makes the diversion or discharge of flue gas more flexible and efficient. The two valves can be controlled independently to manage the flow path of the flue gas in the flue gas pipe 23, thereby achieving fine regulation of flue gas emissions. At the same time, valves are also set on the oxygen pipe 24 and the gas pipe 25. The function of these valves is to accurately control the flow of oxygen and gas, ensuring that the two gases can be introduced in an appropriate proportion and rate during the mixing process, thereby ensuring the stability and reliability of the mixing quality.

[0073] Embodiment 2:

[0074] refer to Figure 6 As shown, the gas distribution mechanism 3 includes an air pump 31, an air extraction pipe 32, an air delivery pipe 33, a branch pipe 34 and an air distribution head 35. The air pump 31 is carefully installed at the highest point of the sintering machine 1 to ensure that it can effectively perform its function. The air extraction pipe 32 is installed on the outer wall of the air pump 31, and its other end extends to the top of the mixing box 21 to facilitate the extraction of gas from the mixing box. The air delivery pipe 33 is connected to one end of the air pump 31 and is responsible for transporting gas from the air pump to other components. The branch pipe 34 and the air distribution head 35 are set at multiple points, which means that there are more than one of them. Multiple branch pipes 34 are installed at the bottom of the air delivery pipe 33 to ensure that the gas can be evenly distributed to each branch pipe. And multiple air distribution heads 35 are installed at the ends of these branch pipes 34 respectively, and their function is to spray the mixed gas evenly to ensure that the gas is very evenly distributed in the entire working area of ​​the sintering machine 1.

[0075] The working process of the entire gas distribution mechanism 3 is directed by the controller 6. The controller 6 is responsible for starting the air extraction pump 31. Once started, the air extraction pipe 32 will generate the necessary suction force to extract the mixed gas from the mixing tank 21. These mixed gases are then transported through the gas transmission pipe 33 to the shunt pipe 34, and finally, are evenly ejected through multiple air distribution nozzles 35. This process ensures the uniform distribution of the mixed gas inside the sintering machine 1, thus achieving efficient combustion. In this way, the sintering process is optimized, and both the sintering efficiency and the overall production capacity of the production line are improved. In addition, this technology also utilizes the waste heat in the flue gas for energy recovery, significantly reducing the energy consumption during the sintering process. Through the combination of circulating flue gas and pure oxygen combustion support, as well as the application of efficient combustion and waste heat utilization technologies, this technology makes full use of the energy in the flue gas, improves the energy efficiency of the sintering process, and reduces the production cost. At the same time, it also significantly improves the heat utilization efficiency and combustion efficiency, thus greatly enhancing the energy conservation and emission reduction effect of the sintering process, making a positive contribution to environmental protection and resource conservation.

[0076] Reference Figure 6 As shown, the air extraction pump 31 is connected to the controller 6 through electrical connection, ensuring the signal and data transmission between the two. This connection method enables the lower part of the outer surface of multiple air distribution nozzles 35 to be accurately positioned in the internal space of the sintering machine 1.

[0077] Through this design, an effective electrical connection between the air extraction pump 31 and the controller 6 can be achieved, enabling the controller 6 to remotely control the air extraction pump 31. This remote control function is crucial for ensuring the uniform distribution of the mixed gas inside the sintering machine 1, and thus can significantly improve the efficiency and quality of the sintering process.

[0078] Example three:

[0079] Reference Figures 7 to 9 As shown, the purification mechanism 5 includes a purification tank 51, a mounting plate 52, a filter 53, a sealing door 54, a desulfurization membrane 55, and a denitration membrane 56. The purification tank 51 is carefully designed and installed at the lower part of one end of the sintering machine 1 to ensure the accuracy of its position and the convenience of operation. The mounting plate 52 is installed between the lower parts of the two inner walls of the purification tank 51, providing a stable mounting platform for the filter 53. The filter 53 is one of the core components of the purification mechanism. It consists of multiple filters 53, and these filters 53 are all installed at the top of the mounting plate 52 to maximize the filtration efficiency. The sealing door 54 is installed at one end of the purification tank 51 to ensure the tightness during the purification process. The desulfurization membrane 55 and the denitration membrane 56 are both installed between the upper parts of the two inner walls of the purification tank 51, and they are the key components for purifying sulfides and nitrogen oxides in the flue gas.

[0080] The design of the filter 53 also reflects precision and practicality. It includes a connecting pipe 531, a connecting ring 532, a bag support frame 533 and a filter bag 534. The connecting pipe 531 is installed on the top of the mounting plate 52 to ensure the connection between the filter 53 and the purification box 51. The connecting ring 532 is installed on the upper outer surface of the connecting pipe 531, which facilitates the installation of the filter bag 534. The bag support frame 533 is installed on the top of the connecting ring 532, providing a supporting structure for the filter bag 534. The filter bag 534 is sleeved and installed on the outer surface of the bag support frame 533. They are the parts of the filter 53 that directly contact the smoke and are responsible for capturing particulate matter in the smoke.

[0081] In actual use, the bottom material hopper 9 first evenly spreads the bottom material in the sintering machine 1, providing a good foundation for the sintering process. Subsequently, the distributor 10 evenly covers the mixed material on the bottom material, providing the necessary materials for the sintering process. The controller 6 is then started to control the igniter inside the sintering machine 1 to ignite the sintering material, and the sintering work is officially started. At the same time, the controller 6 also controls the start-up of multiple exhaust boxes 7, which force exhaust inside the sintering machine 1. This process not only helps to discharge gas and impurities, but also promotes the densification of sintered blocks. The extracted flue gas is collected in the flue pipe 8 and then transported to the bottom of the purification box 51. Here, the flue gas passes through multiple connecting pipes 531 and is diverted into the filter bags 534 supported by multiple bag support racks 533. These filter bags 534 can effectively remove particulate matter in the flue gas. The flue gas that has been initially filtered will continue to pass through the desulfurization membrane 55 and the denitrification membrane 56 for desulfurization and denitrification treatment. This series of purification processes ensures that the recovered flue gas is properly treated, realizes efficient flue gas recovery, and promotes the recycling of flue gas. When the filter bag 534 needs to be replaced, the operator only needs to open the sealing door 54 and rotate the connecting ring 532 to easily remove it from the connecting pipe 531, and then disassemble the bag support frame 533 and the filter bag 534 thereon for replacement. The whole process is simple and fast, which greatly improves the maintenance efficiency.

[0082] refer to Figures 7 to 9 As shown, on the outer surface of the connecting pipe 531, we notice that the upper part thereof is carefully designed with a spiral pattern structure. This design is not only beautiful, but also plays a vital role in practical applications. It can effectively promote the close connection between the connecting pipe 531 and the connecting ring 532, thereby greatly improving the stability and sealing of the connection. In addition, this spiral pattern design also makes it easy for operators to easily remove the filter bag 534 when necessary, so as to carry out necessary replacement and maintenance work.

[0083] There is a certain distance between the top end surface of the filter bag 534 and the bottom end surface of the desulfurization membrane 55, and this distance is precisely calculated to ensure that it is greater than the height of the connecting ring 532. Such design considerations are to ensure that the filter bag 534 can be fully supported during operation, while avoiding unnecessary friction or contact with the desulfurization membrane 55, thereby protecting the desulfurization membrane 55 from damage.

[0084] The filter bag 534 itself is specially designed as a PTFE coated filter bag. PTFE, or polytetrafluoroethylene, is a material with excellent chemical stability. It can withstand extreme chemical corrosion environments while maintaining its physical properties. In addition, PTFE material also has excellent high temperature resistance and can work stably in high temperature environments, which is a very important advantage for filter bags. Not only that, the PTFE coated filter bag also demonstrates excellent filtration efficiency, which can effectively capture and separate tiny particles and harmful substances in the air to ensure the cleanliness of the exhaust gas.

[0085] In summary, by providing spiral patterns on the connecting pipe 531 and using PTFE coated filter bags as filter media, this design not only improves the overall performance and reliability of the system, but also ensures the high efficiency and environmental protection of the filtering process, reflecting the designer's exquisite consideration of details and emphasis on environmental protection.

[0086] refer to Figures 1 to 9 As shown, a method for a sintering emission reduction device based on flue gas circulation and pure oxygen combustion-assisted combustion includes the following steps:

[0087] Step 1: Extracting flue gas: First, the bottom material is evenly spread in the sintering machine 1 through the bottom material hopper 9, and then the mixed material is evenly spread on the bottom material by the distributor 10. Then, the sintering machine 1 is started to perform sintering. During this process, the exhaust box 7 will start forced exhaust, which can effectively promote the densification of the sintered block. Finally, the generated flue gas is introduced into the purification mechanism 5 through the flue pipe 8 for the next step of treatment;

[0088] Step 2: Purify flue gas: After entering the purification box 51, the flue gas will flow into the connecting pipe 531. At this stage, the particulate matter in the flue gas can be effectively removed by the filter bag 534. Subsequently, the flue gas will pass through the desulfurization membrane 55 and the denitrification membrane 56 for desulfurization and denitrification treatment. This process can significantly reduce the concentration of pollutants in the flue gas and ensure that the quality of the recovered flue gas meets the standards for reuse;

[0089] Step 3, Mixing and combustion-supporting: The flue gas, oxygen and coal gas can be respectively input into the interior of the mixing box 21 through the flue gas pipe 23, the oxygen pipe 24 and the gas pipe 25. Then, the driver 224 is started, which will drive the multiple stirring racks 222 and the multiple stirring blades 223 to rotate to ensure that the flue gas can be evenly mixed with oxygen and coal gas. This process realizes the recycling of flue gas and can effectively utilize the waste heat and exhaust gas in the sintering process, thereby reducing energy consumption. At the same time, combined with pure oxygen combustion-supporting, more efficient combustion can be achieved;

[0090] Step 4: Flue gas circulation: Start the exhaust pump 31, which extracts the mixed gas and inputs it into the multiple branch pipes 34. Then, the mixed gas is evenly distributed to the upper part of the sintering machine 1 through the multiple gas distribution heads 35. By recycling the flue gas, the demand for fresh air can be effectively reduced, thereby improving the heat utilization efficiency during the sintering process. In addition, using pure oxygen as a combustion aid can further improve the combustion efficiency.

[0091] Application examples:

[0092] This design is mainly used in steel smelting, non-ferrous metal smelting (such as copper, aluminum, etc.), cement manufacturing and other industrial production environments involving high-temperature sintering processes. In steel smelting, the sintering process is a key step in producing iron ore for blast furnaces, and it plays a vital role in the entire steel production process. In the non-ferrous metal smelting process, high-temperature sintering is also included, which is also crucial to ensure the quality and output of non-ferrous metals. In the production of cement clinker, rotary kiln sintering is a crucial step, which directly affects the quality and production efficiency of cement. This design 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 reuse standard, thereby reducing pollution to the environment. 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. Pure oxygen combustion-supporting technology can significantly increase the flame temperature and combustion speed, thereby promoting the sintering process and improving production efficiency. At the same time, this design also uses the waste heat in the flue gas for energy recovery, effectively reducing the energy consumption of the sintering process and achieving efficient use of energy. The mixed gas is evenly distributed inside the sintering machine 1 through the gas distribution mechanism 3, which optimizes the sintering process, improves the sintering efficiency, and thus increases the overall production capacity of the production line. Through the combined application of flue gas circulation and pure oxygen combustion-supporting technology, this design significantly reduces energy consumption and pollutant emissions during the sintering process, which is beneficial to environmental protection and sustainable development. In addition, the adoption of efficient combustion and waste heat utilization technology can make full use of the energy in the flue gas, further improve the energy efficiency of the sintering process, reduce production costs, and bring positive impacts to the economic benefits of the enterprise.

[0093] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sintering emission reduction method based on flue gas circulation and pure oxygen combustion, characterized in that: include: Extracting flue gas: evenly spreading the bottom material in the sintering machine (1) through the bottom material hopper (9), evenly spreading the mixed material on the bottom material through the distributor (10), and then starting the sintering machine (1) to perform sintering, and the flue gas in the sintering machine (1) is input into the purification mechanism (5) through the gas transmission pipeline; Purifying flue gas: Purifying flue gas using a purification mechanism (5); Mixing and combustion-supporting: the flue gas, oxygen and coal gas are respectively introduced into the mixing box (21) through the flue gas pipe (23), the oxygen pipe (24) and the coal gas pipe (25) for mixing; Flue gas circulation: The gas distribution mechanism (3) extracts the mixed gas in the mixing box (21) and introduces the mixed gas into the sintering machine (1).

2. The sintering emission reduction method based on flue gas circulation and pure oxygen combustion according to claim 1 is characterized in that: Before extracting the flue gas, firstly, M exhaust boxes (7) are installed at the bottom end of the sintering machine (1), where M is a natural number greater than 0, and the outlets of the M exhaust boxes (7) are connected to the flue pipe (8), and the outlet of the flue pipe (8) is connected to the inlet of the purification mechanism (5).

3. The sintering emission reduction method based on flue gas circulation and pure oxygen combustion according to claim 1 is characterized in that: Before purifying the flue gas, a purification mechanism (5) is designed. First, a purification box (51) with a sealed structure is designed. Then, a mounting plate (52) is horizontally arranged in the purification box (51). Subsequently, N filters (53) are installed on the mounting plate (52), where N is a natural number greater than 0. A flue gas outlet is arranged at the top of the purification box (51). Finally, a desulfurization membrane (55) and a denitrification membrane (56) are arranged above the filters.

4. The sintering emission reduction method based on flue gas circulation and pure oxygen combustion according to claim 1 is characterized in that: The filter (53) comprises a connecting pipe (531), a connecting ring (532), a bag support frame (533) and a filter bag (534); the connecting pipe (531) is mounted on the upper surface of the mounting plate (52); the connecting ring (532) is mounted on the connecting pipe (531); the bag support frame (533) is mounted on the upper end of the connecting ring (532); and the filter bag (534) is sleeved and mounted on the outer surface of the bag support frame (533).

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

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

7. The sintering emission reduction method based on flue gas circulation and pure oxygen combustion according to claim 6 is characterized in that: The stirring shaft (221) is horizontally installed in the mixing box (21), and a plurality of flow-turbulating holes are opened on the side wall of the stirring frame (222).

8. The sintering emission reduction method based on flue gas circulation and pure oxygen combustion according to claim 1 is characterized in that: Before the flue gas circulates, a gas distribution mechanism (3) is constructed, which specifically includes: Connecting one end of the air extraction pipe (32) to the air outlet of the mixing mechanism (2); An air pump (31) is installed at the other end of the air extraction pipe (32); The air outlet of the air pump (31) is connected to the air inlet of the air delivery pipe (33); The side wall of the gas delivery pipe (33) is connected to the gas inlet of L diversion pipes (34); Q air distribution heads (35) are installed on the side wall of each shunt pipe (34), where Q is a natural number greater than 1; The outlet of the gas distribution head (35) is located inside the sintering machine (1).

9. The sintering emission reduction method based on flue gas circulation and pure oxygen combustion according to claim 8, characterized in that: An electric control valve is installed on each gas transmission pipeline, and the controller is connected to each electric control valve via a data line.

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