A pollution zero-increase energy-saving low-carbon yield-increasing system applied to a step-by-step sintering machine

Abstract

The application provides a pollution zero-increase energy-saving low-carbon yield-increasing system applied to a walking beam sintering machine, which comprises a sintering section flue gas treatment module and a cooling section flue gas treatment module; the sintering section flue gas treatment module comprises a material surface circulation unit, a pallet side wall circulation unit and an external flue gas treatment unit. The flue gas system of the walking beam sintering machine is re-optimized and constructed, under the condition that the existing environmental protection facilities are not transformed, through the distribution of the air volume of the sintering section and the cooling section of the walking beam sintering machine, especially the increase of the sintering machine side wall air leakage circulation, the air volume of the sintering section is reduced while the yield is increased, and the existing environmental protection treatment capacity is matched, so that the yield increase and the pollution emission increase can be realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of metallurgy, and particularly relates to a pollution zero increase energy saving low carbon yield increasing system applied to a walking beam sintering machine. BACKGROUND

[0002] The walking beam sintering machine accounts for a large proportion in the application in the steel industry. The running trolley part of the walking beam sintering machine is divided into a sintering section and a cooling section. When normally running, the sintering terminal is controlled at the end of the sintering section. The flue gas generated in the sintering section is collected by the sintering section air bellow and then subjected to dust removal, desulfurization and denitrification treatment. The flue gas generated in the cooling section only contains particulate matter, which is collected by the cooling section air bellow and then subjected to dust removal treatment.

[0003] When the walking beam sintering machine needs to increase the yield, the thickness of the material layer and the speed of the trolley are generally increased to achieve the purpose. When the yield of the walking beam sintering machine exceeds the rated yield, the sintering terminal will reach the cooling section, causing the increase of pollutants such as sulfur dioxide, nitrogen oxides and carbon monoxide in the flue gas of the cooling section. If the cooling section only performs dust removal treatment at this time, it will not meet the emission standard requirements. Adding desulfurization and denitrification facilities to the cooling section will cause a sharp increase in investment and operating costs.

[0004] In addition, the negative pressure of the system of the walking beam sintering machine during the sintering process will inevitably cause a certain degree of air leakage between the material surface gap and the trolley side wall, thereby causing the oxygen content of the sintering flue gas to rise. The air leakage of the trolley side wall, the slide and other parts accounts for more than 20%. The system air leakage increases the flue gas emission and the oxygen content of the flue gas. In the case that the emission standard is set at 16% of the reference oxygen content, the increase of the oxygen content in the flue gas will inevitably cause the burden of the environmental protection treatment facility to increase. SUMMARY

[0005] To solve the above technical problems, the application provides a pollution zero increase energy saving low carbon yield increasing system applied to a walking beam sintering machine. To have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not a general review, nor is it intended to determine the key / important constituent elements or delineate the scope of protection of these embodiments. Its only purpose is to present some concepts in a simple form as a prelude to the detailed description that follows.

[0006] The application adopts the following technical solutions:

[0007] In some optional embodiments, a pollution zero increase energy saving low carbon yield increasing system applied to a walking beam sintering machine is provided, which comprises: a sintering section flue gas treatment module and a cooling section flue gas treatment module for collecting the flue gas in the cooling section air bellow of the walking beam sintering machine and performing dust removal treatment.

[0008] The sintering section flue gas treatment module comprises a material surface circulation unit, a pallet side wall circulation unit, and an external exhaust flue gas treatment unit for extracting and carrying out dust removal, desulfurization and denitrification treatment on the external exhaust flue gas in the sintering section wind box of the walking beam sintering machine.

[0009] The pallet side wall circulation unit comprises a side wall flue gas circulation cover and a side wall flue gas circulation fan.

[0010] The side wall flue gas circulation cover is arranged on the pallet side wall of the walking beam sintering machine, and the side wall flue gas circulation fan extracts flue gas in the middle section wind box of the sintering section of the walking beam sintering machine and conveys the flue gas into the side wall flue gas circulation cover.

[0011] The material surface circulation unit comprises a top side flue gas circulation cover and a material surface flue gas circulation fan.

[0012] The top side flue gas circulation cover extends to cover the sintering end position after the production of the walking beam sintering machine, and the material surface flue gas circulation fan extracts flue gas in the tail section wind box of the sintering section of the walking beam sintering machine and conveys the flue gas into the top side flue gas circulation cover.

[0013] Further, the pallet side wall circulation unit further comprises a first dust remover, and the first dust remover is arranged on a pipeline connected between the middle section wind box of the sintering section of the walking beam sintering machine and the side wall flue gas circulation fan.

[0014] Further, the pallet side wall circulation unit further comprises a plurality of distribution pipelines uniformly distributed on the side wall flue gas circulation cover, and a pipeline valve is arranged on each of the distribution pipelines.

[0015] Further, an inspection door and an inspection observation hole are arranged on the side wall flue gas circulation cover.

[0016] Further, the side wall flue gas circulation cover comprises an upper circulation cover and a lower circulation cover, one side of the upper circulation cover is fixedly connected with the pallet ground, the other side is provided with a dynamic connection mechanism, and the dynamic connection mechanism is in contact with the pallet of the walking beam sintering machine, and one side of the lower circulation cover is connected with the pallet ground, and the other side is connected with the wind box of the walking beam sintering machine.

[0017] Further, the dynamic connection mechanism comprises a rubber plate, a fastening connecting piece, a compression spring, a pressing frame and a spring fixing piece, one end of the rubber plate is connected with the upper circulation cover through the fastening connecting piece, and the other end is in contact with the pallet wall plate, the pressing frame is arranged on the upper circulation cover, one end of the compression spring is connected with the pressing frame through the spring fixing piece, and the other end is connected with the rubber plate.

[0018] Further, the side wall flue gas circulation cover is provided with a roller inlet and outlet at both ends of the walking beam sintering machine, and a sealing air curtain is arranged at the top of the roller inlet and outlet.

[0019] Further, the material surface circulation unit further comprises a second dust remover; the second dust remover is arranged on a pipeline connecting a sintering section tail section air box of the step sintering machine and the material surface flue gas circulation fan.

[0020] Further, the external flue gas treatment unit comprises: a flue gas treatment subunit for desulfurization and denitrification treatment of flue gas discharged from the sintering section of the step sintering machine; a main exhaust fan for extracting flue gas in the sintering section air box of the step sintering machine and conveying the flue gas to the flue gas treatment subunit; and a third dust remover arranged on a pipeline connecting the sintering section air box of the step sintering machine and the main exhaust fan, for dust removal treatment of flue gas discharged from the sintering section of the step sintering machine.

[0021] Further, the cooling section flue gas treatment subsystem comprises a fourth dust remover and a cooling fan; the cooling fan is used for extracting flue gas in the cooling section air box of the step sintering machine, and the fourth dust remover is arranged on a pipeline connecting the cooling section air box of the step sintering machine and the cooling fan.

[0022] The beneficial effects brought by the present application are:

[0023] 1. The flue gas circulation is arranged on the side wall of the pallet of the step sintering machine, and the middle section flue gas in the sintering section is selected to enter the system through the air leakage point, so that the original air leaked into the system is replaced by the circulating flue gas, thereby reducing the overall oxygen content of the flue gas and the flue gas treatment capacity of the desulfurization and denitrification system;

[0024] 2. The flue gas system of the step sintering machine is re-optimized in the present application, and the flue gas is collected and treated in sections by re-distributing and combining the air box and the flue duct, so that the sintering section of the step sintering machine is lengthened and the yield is improved without increasing the desulfurization and denitrification facilities, and the total flue gas volume, the oxygen content of the flue gas and the carbon monoxide emission of the sintering system are reduced while the pollutants are not increased, so as to achieve the purposes of energy saving, emission reduction and efficiency improvement. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic diagram of the present application;

[0026] Figure 2 is a structural schematic diagram of the side wall flue gas circulation cover of the present application;

[0027] Figure 3 is a layout schematic diagram of the distribution pipeline of the present application;

[0028] Figure 4 is a structural schematic diagram of the dynamic connection mechanism of the present application;

[0029] Figure 5is a schematic view of the import and export positions of the roller of the present application. DETAILED DESCRIPTION

[0030] The following description and drawings are illustrative of specific embodiments of the present application and are not intended to be limiting thereof. Other embodiments can include structural, logical, electrical, process, and other changes. The examples represent the possible changes that can be made. Individual components and functions are optional unless explicitly required, and the order of operations can be varied. Portions and features of some embodiments can be included or substituted in or for portions and features of other embodiments.

[0031] As Figures 1-5 shown, in some illustrative embodiments, the present application provides a pollution zero-increase energy-saving low-carbon yield-increasing system applied to a step-by-step sintering machine, which improves yield while realizing no increase in pollutant emissions in flue gas and energy-saving low-carbon operation.

[0032] The working material surface of the step-by-step sintering machine is divided into a sintering section and a cooling section, and a wind box 2 for collecting flue gas is arranged below the trolley 1 of the step-by-step sintering machine, the present application defines the wind box 2 located below the sintering section of the step-by-step sintering machine as a sintering section wind box, and the wind box 2 located below the cooling section of the step-by-step sintering machine as a cooling section wind box.

[0033] The present application specifically includes: a sintering section flue gas treatment module and a cooling section flue gas treatment module.

[0034] The sintering section flue gas treatment module is used to collect flue gas in the sintering section wind box of the step-by-step sintering machine and perform dust removal, desulfurization, and denitrification, material surface circulation, and side wall circulation treatment.

[0035] The cooling section flue gas treatment module is used to collect flue gas in the cooling section wind box of the step-by-step sintering machine and perform dust removal treatment.

[0036] Therefore, the present application realizes the collection and treatment of flue gas in the sintering process by the combination and segmentation of the wind box 2, the sintering section flue gas treatment module, and the cooling section flue gas treatment module, the sintering section flue gas needs dust removal, desulfurization, and denitrification treatment, and the cooling section flue gas only needs dust removal treatment.

[0037] Among them, the present application divides the sintering section of the step-by-step sintering machine into a sintering section front section, a sintering section middle section, and a sintering section tail section in turn according to the trolley running direction, the lengths of the three sections are determined by the specific sintering environment and sintering parameters, and the present application does not make specific limitations. The present application defines the wind box 2 located below the sintering section front section as a sintering section front section wind box, the wind box 2 located below the sintering section middle section as a sintering section middle section wind box, and the wind box 2 located below the sintering section tail section as a sintering section tail section wind box.

[0038] The sintering section flue gas treatment module includes: a material surface circulation unit, a trolley side wall circulation unit, and an exhaust flue gas treatment unit.

[0039] The exhaust gas treatment unit is used to extract the exhaust gas from the sintering section air box of the walking beam sintering machine and perform dust removal, desulfurization, and denitrification treatment. The remaining exhaust gas after the two circulating flue gas streams used by the material surface circulation unit and the trolley side wall circulation unit are all treated for desulfurization and denitrification by the exhaust gas treatment unit.

[0040] The exhaust gas treatment unit includes: flue gas treatment subunit 3, main exhaust fan 4, and third dust collector 5.

[0041] The third dust collector 5 is installed on the pipeline connecting the sintering section air box of the walking beam sintering machine and the main exhaust fan 4. This allows the flue gas in the sintering section air box to first enter the third dust collector 5 for dust removal. The main exhaust fan 4 is used to extract the flue gas from the sintering section air box of the walking beam sintering machine and transport it to the flue gas treatment subunit 3. The flue gas treatment subunit 3 is used to desulfurize and denitrify the flue gas discharged from the sintering section. The existing desulfurization and denitrification flue gas treatment system can be used for the flue gas treatment subunit 3.

[0042] The material surface circulation unit includes: a top-side flue gas circulation hood 6, a material surface flue gas circulation fan 7, and a second dust collector 8.

[0043] The top-side flue gas circulation hood 6 is connected to the interior of the trolley 1 and extends to cover the sintering endpoint after the walking beam sintering machine increases production. The second dust collector 8 is installed on the pipeline connecting the tail section air box of the sintering section of the walking beam sintering machine and the material surface flue gas circulation fan 7. The flue gas discharged from the tail section air box of the sintering section is first treated by the second dust collector 8 for dust removal. The material surface flue gas circulation fan 7 draws the flue gas from the tail section air box of the sintering section of the walking beam sintering machine and transports it to the top-side flue gas circulation hood 6.

[0044] During the production process of a walking beam sintering machine, the oxygen content of the flue gas in the sintering section tends to increase from low to high as the sintering progresses, with the oxygen content being higher closer to the sintering endpoint. The trend of sulfur dioxide content in the flue gas is the same as that of oxygen content. The flue gas temperature in each air box also increases with the sintering process, with the temperature being higher closer to the sintering endpoint.

[0045] This invention, based on a material surface circulation unit, extends the top-side flue gas circulation hood 6 to the sintering endpoint after production increase in hot blast sintering. Simultaneously, flue gas with high oxygen content and high temperature from the tail section of the sintering stage is selected as circulating flue gas and enters the top-side flue gas circulation hood 6 for hot blast sintering. The circulating flue gas accounts for 20-30% of the total flue gas volume. After dust removal, the circulating flue gas returns to the upper part of the sintering material surface and is evenly distributed to the sintering material surface through pipelines and multiple points of distribution within the top-side flue gas circulation hood 6, achieving hot blast sintering. A slight negative pressure is maintained within the top-side flue gas circulation hood 6 to ensure no leakage of circulating flue gas. The structural design of this invention significantly reduces the sintering fuel ratio in hot blast sintering, while also reducing the generation and emission of carbon monoxide. Due to the use of high-oxygen flue gas circulation, the quality of the sintered ore is also guaranteed.

[0046] The trolley side wall circulation unit includes: a side wall flue gas circulation hood 9, a side wall flue gas circulation fan 10, and a first dust collector 11.

[0047] The sidewall flue gas recirculation hood 9 is installed on the sidewall of the trolley of the walking beam sintering machine, and seals the air leakage parts such as the trolley sidewall and slide rails inside itself. The first dust collector 11 is installed on the pipeline connecting the middle section air box of the sintering section and the sidewall flue gas recirculation fan 10. The flue gas discharged from the middle section air box of the sintering section first enters the first dust collector 11 for dust removal. The sidewall flue gas recirculation fan 10 draws the flue gas from the middle section air box of the sintering section of the walking beam sintering machine and transports it into the sidewall flue gas recirculation hood 9. That is, the present invention selects the sintering middle section flue gas with low oxygen content and low sulfur dioxide concentration to replace the original leaked air. Because it adopts its own flue gas recirculation, it reduces both the total air volume of the system and the oxygen content of the flue gas.

[0048] The flue gas used for circulation on the side wall of the trolley accounts for 15-20% of the total flue gas volume. Because of its low oxygen content, it can reduce the total oxygen content of the flue gas by 3-5% after replacing air. At the same time, the selected flue gas has a low sulfur dioxide concentration, which will not cause corrosion to the sintering equipment.

[0049] Based on the trolley sidewall circulation unit, this invention makes full use of the inherent air leakage characteristics of the walking beam sintering machine. A flue gas circulation is set up on the trolley sidewall of the walking beam sintering machine. Flue gas with low oxygen content and low pollutant concentration, especially sulfur dioxide, is selected from the middle section of the sintering section and enters the sintering system through the air leakage point of the device. The air that originally leaked into the sintering system is replaced by circulating flue gas. That is, the flue gas circulation through the trolley sidewall circulation unit reduces the overall oxygen content of the flue gas and at the same time reduces the amount of flue gas to be treated for desulfurization and denitrification.

[0050] The trolley sidewall circulation unit of this invention achieves flue gas circulation along the trolley sidewall, while the material surface circulation unit achieves flue gas circulation along the material surface. By combining these two flue gas circulation systems, the sintering section length of the walking beam sintering machine is extended, increasing its output. Simultaneously, the structural design of this invention ensures that the amount of flue gas to be treated in the sintering section does not increase. In other words, under the existing desulfurization and denitrification system's processing capacity, the exhaust flue gas treatment unit can achieve full compliance treatment of flue gas containing sulfur dioxide and nitrogen oxides. The amount of flue gas emitted in the cooling section is reduced compared to before optimization, thus lowering the load on the flue gas treatment system.

[0051] The cooling section flue gas treatment subsystem includes: a fourth dust collector 12 and a cooling fan 13.

[0052] Cooling fan 13 is used to extract flue gas from the cooling section air box of the walking beam sintering machine. The fourth dust collector 12 is installed on the pipe connecting the cooling section air box of the walking beam sintering machine and the cooling fan 13 for dust removal.

[0053] To avoid the introduction of pollutants such as sulfur dioxide and nitrogen oxides into the flue gas of the cooling section when increasing the output of a walking beam sintering machine, thus increasing the construction of pollution control facilities and operating costs, this invention re-optimizes the flue gas system of the walking beam sintering machine. By redistributing and combining the air boxes and flues, the sintering section is extended. While increasing sintering output, all flue gas containing sulfur dioxide and nitrogen oxides is treated using the original desulfurization and denitrification system, i.e., the exhaust gas treatment unit. Flue gas containing sulfur dioxide and nitrogen oxides entering the cooling section due to increased output is distributed and incorporated into the sintering section flue gas treatment module for treatment through the air box redistribution and combination. The remaining flue gas containing only particulate matter is still treated by the cooling section flue gas treatment subsystem.

[0054] Through the optimization of this invention, the walking beam sintering machine can achieve a 50% increase in output, a 40-50% reduction in flue gas emissions, and no increase in pollutants. It can achieve emission standards using the existing desulfurization and denitrification system, while also reducing the system's carbon monoxide emissions.

[0055] Based on the above, this invention incorporates 1‰ of a proprietary sintering additive during the sintering batching process, which can improve the sintering environment, increase the utilization rate of fuel and oxygen during the sintering process, improve the sintering process, and increase the yield by 10% at the same sintering endpoint, while reducing the emission of carbon monoxide during the sintering process.

[0056] By optimizing the flue gas system and adding proprietary sintering additives, this invention enables a 60% increase in output and a 40-50% reduction in flue gas emissions in a walking beam sintering machine, with no increase in pollutants. The existing desulfurization and denitrification system can be used to achieve emission standards, while also reducing the system's carbon monoxide emissions.

[0057] The structural design of this invention enables the production output to be increased while reducing the air volume in the sintering section without modifying existing environmental protection facilities. This is achieved by distributing the air volume in the sintering and cooling sections of the walking beam sintering machine, and especially by increasing the air circulation through the side wall leakage of the sintering machine. This design matches the processing capacity of existing environmental protection facilities, allowing for increased production output without any change in pollutant emissions.

[0058] like Figure 3 As shown, the trolley side wall circulation unit also includes: several distribution pipes 14 evenly distributed on the side wall flue gas circulation hood 9, and each distribution pipe 14 is provided with a pipe valve 15, and the side wall flue gas circulation hood 9 is provided with an inspection door 16 and an inspection observation hole 17.

[0059] Low-oxygen, low-sulfur dioxide flue gas, after dust removal, is drawn into the side-wall flue gas circulation hood 9 by the side-wall flue gas circulation fan 10. Using distribution pipes 14 and pipe valves 15, the flue gas is distributed to multiple points within the side-wall flue gas circulation hood 9 according to its length. The negative pressure generated by the leakage of the walking beam sintering machine draws the gas into the main flue, replacing the air previously drawn in. Through the matching of the leakage negative pressure and the circulation gas volume, a slight negative pressure state not exceeding -10 Pa is maintained within the side-wall flue gas circulation hood 9, preventing the circulating flue gas from leaking out. The side-wall flue gas circulation hood 9 is equipped with an inspection observation hole 17 and an inspection door 16 for convenient daily inspection and maintenance.

[0060] The side wall flue gas circulation hood 9 is installed on both sides of the trolley 1. Each side consists of a part above the trolley platform and a part below the trolley platform. That is, the side wall flue gas circulation hood 9 includes: an upper circulation hood 91 and a lower circulation hood 92. Together with the dynamic trolley 1 and the static air box 2, they form a trolley side wall sealing hood, which puts all the air leakage points of the trolley side wall, slide rails and other side walls inside the hood.

[0061] The lower circulation hood 92 and the air box 2 are statically sealed, that is, one side of the lower circulation hood 92 is fixedly connected to the trolley ground 18, and the other side is fixedly connected to the air box 2 of the walking beam sintering machine. The fixed connection method can be bolt connection, which can efficiently maintain the negative pressure inside the hood.

[0062] The seal between the upper circulation cover 91 and the trolley 1 is a dynamic seal, that is, one side of the upper circulation cover 91 is fixedly connected to the trolley ground 18, and the connection method can be bolt connection. The other side of the upper circulation cover 91 is provided with a dynamic connection mechanism, and the dynamic connection mechanism is in contact with the trolley of the walking beam sintering machine, specifically in contact with the trolley wall panel 19, to achieve dynamic sealing.

[0063] like Figure 4 As shown, the dynamic connection mechanism includes: a rubber plate 20, a fastening connector 21, a compression spring 22, a clamping frame 23, and a spring fixing member 24.

[0064] One end of the rubber plate 20 is connected to the upper circulation cover 91 via a fastening connector 21, and the other end contacts the trolley wall panel 19, ensuring that the rubber plate 20 is always resting on the trolley wall panel 19. This does not affect the movement of the trolley and also ensures a seal between the trolley 1 and the upper circulation cover 91. The fastening connector 21 can be a bolt. Using the flexible rubber plate 20 for sealing, a rubber plate 20 of the same length as the upper circulation cover 91 is installed at the front end of the upper circulation cover 91 using bolts. One end of the rubber plate 20 is in close contact with the top of the trolley wall panel 19, forming a dynamic seal.

[0065] A clamping frame 23 is mounted on the upper circulation cover 91. One end of a compression spring 22 is connected to the clamping frame 23 via a spring fixing member 24, and the other end is connected to the rubber plate 20. The spring fixing member 24 can be a bolt. The compression springs 22 are evenly distributed according to the length of the upper circulation cover 91. The compression springs 22 apply thrust to the rubber plate 20, ensuring a tight fit between the flexible rubber plate 20 and the top of the trolley wall panel 19.

[0066] The side wall flue gas circulation hood 9 has roller inlets and outlets 25 at both ends corresponding to the walking beam sintering machine, and the top of the roller inlets and outlets 25 is equipped with a sealed air curtain 26. The design of the roller inlets and outlets 25 facilitates the normal production operation of the trolley 1 and ensures negative pressure inside the side wall flue gas circulation hood 9 and prevents flue gas from overflowing. The sealed air curtain 26 is located at the top of the roller inlets and outlets 25 at both ends, which separates the outside air from the flue gas inside the hood. The air in the air curtain is the air inside the workshop.

[0067] Those skilled in the art will also understand that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments herein can be implemented as electronic hardware, computer software, or a combination thereof. To clearly illustrate the interchangeability between hardware and software, the various illustrative components, blocks, modules, circuits, and steps described above are generally described in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. Those skilled in the art can implement the described functionality in alternative ways for each specific application; however, such implementation decisions should not be construed as departing from the scope of this disclosure.

Claims

1. A zero-pollution, energy-saving, low-carbon production-increasing system applied to a walking beam sintering machine, characterized in that, By utilizing the air leakage of the walking beam sintering machine itself, a flue gas circulation system is set up on the side wall of the walking beam sintering machine trolley. The flue gas in the middle section of the sintering section with low oxygen content and low sulfur dioxide concentration is selected and enters the system through the air leakage point. The air that originally leaked into the system is replaced with circulating flue gas, which reduces the overall oxygen content of the flue gas and the flue gas treatment capacity of the desulfurization and denitrification system. Includes: a sintering section flue gas treatment module and a cooling section flue gas treatment module for collecting flue gas from the cooling section air box of the walking beam sintering machine and performing dust removal. The sintering section flue gas treatment module includes: a material surface circulation unit, a trolley side wall circulation unit, and an exhaust flue gas treatment unit for extracting exhaust flue gas from the sintering section air box of the walking beam sintering machine and performing dust removal, desulfurization, and denitrification treatment. The trolley side wall circulation unit includes: a side wall flue gas circulation hood and a side wall flue gas circulation fan; The side wall flue gas circulation hood is installed on the side wall of the trolley of the walking beam sintering machine. The side wall flue gas circulation fan draws the flue gas from the middle section air box of the sintering section of the walking beam sintering machine and delivers it to the side wall flue gas circulation hood. The material surface circulation unit includes: a top-side flue gas circulation hood and a material surface flue gas circulation fan; The top-side flue gas circulation hood extends to cover the sintering endpoint after the step sintering machine increases production, and the material surface flue gas circulation fan draws the flue gas from the tail section air box of the step sintering machine and transports it into the top-side flue gas circulation hood. The sidewall flue gas recirculation hood includes: an upper recirculation hood and a lower recirculation hood; One side of the upper circulation cover is fixedly connected to the ground of the trolley, and the other side is provided with a dynamic connection mechanism, which is in contact with the trolley of the walking beam sintering machine. One side of the lower circulation hood is connected to the ground of the trolley, and the other side is connected to the air box of the walking beam sintering machine; the dynamic connection mechanism includes: a rubber plate, fastening connectors, compression springs, a clamping frame, and spring fixing components; One end of the rubber sheet is connected to the upper circulation cover via the fastening connector, and the other end is in contact with the trolley wall panel; The clamping frame is mounted on the upper circulation cover. One end of the compression spring is connected to the clamping frame via the spring fixing member, and the other end is connected to the rubber plate.

2. The zero-pollution, energy-saving, low-carbon production-increasing system for a walking beam sintering machine according to claim 1, characterized in that, The trolley sidewall circulation unit further includes: a first dust collector; the first dust collector is installed on the pipe connecting the middle section air box of the sintering section of the walking beam sintering machine and the sidewall flue gas circulation fan.

3. The zero-pollution, energy-saving, low-carbon production-increasing system for a walking beam sintering machine according to claim 2, characterized in that, The trolley sidewall circulation unit further includes: several distribution pipes evenly distributed on the sidewall flue gas circulation hood, and each of the distribution pipes is equipped with a pipe valve.

4. The zero-pollution, energy-saving, low-carbon production-increasing system for a walking beam sintering machine according to claim 3, characterized in that, The side wall flue gas circulation hood is provided with roller inlets and outlets at both ends of the walking beam sintering machine, and the top of the roller inlets and outlets is provided with a sealed air curtain.

5. The zero-pollution, energy-saving, low-carbon production-increasing system for a walking beam sintering machine according to claim 4, characterized in that, The material surface circulation unit further includes a second dust collector; the second dust collector is installed on the pipeline connecting the tail section air box of the sintering section of the walking beam sintering machine and the material surface flue gas circulation fan.

6. The zero-pollution, energy-saving, low-carbon production-increasing system for a walking beam sintering machine according to claim 5, characterized in that, The exhaust gas treatment unit includes: The flue gas treatment subunit is used to desulfurize and denitrify the flue gas discharged from the sintering section of the walking beam sintering machine. The main exhaust fan is used to extract the flue gas from the sintering section air box of the walking beam sintering machine and transport it to the flue gas treatment subunit. The third dust collector is installed on the pipe connecting the sintering section air box of the walking beam sintering machine and the main exhaust fan, and is used to remove dust from the flue gas discharged from the sintering section of the walking beam sintering machine.

7. A zero-pollution, energy-saving, low-carbon production-increasing system for a walking beam sintering machine as described in claim 6, characterized in that, The cooling section flue gas treatment module includes: a fourth dust collector and a cooling fan; the cooling fan is used to extract flue gas from the cooling section air box of the walking beam sintering machine, and the fourth dust collector is installed on the pipe connecting the cooling section air box of the walking beam sintering machine and the cooling fan.

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