A gas combustion system for yank gas cover heating

Abstract

The utility model discloses a kind of gas combustion systems for yunker gas cover heating, including flue, the flue includes upstream return flue and downstream return flue;The upstream return flue is connected with the exhaust port of gas yunker gas cover system, the upstream return flue is connected with downstream return flue through main filter assembly with the end of yunker gas cover away, pressure relief module is used to send the flue gas in upstream return flue to third flue, the third flue is connected with fourth flue through second filter module with the end of pressure relief module away, the fourth flue is connected with downstream return flue with the end of second filter module away, main, vice filter assembly form spare complement, when another component can work normally, any component maintenance, ensure that flue gas always enters recovery device after filtering, to realize no stop machine core replacement.

Description

Technical Field

[0001] This utility model relates to the field of papermaking equipment filtration technology, specifically to a gas combustion system for Yankee gas hood heating. Background Technology

[0002] Heat recovery equipment (such as plate heat exchangers and waste heat boilers) in Yankee gas hood systems require filtration systems to remove dust, tar, and corrosive impurities from the flue gas. Existing filtration systems have a fatal flaw: The single-path filtration design leads to filter cartridge clogging (usually requiring shutdown and replacement after 1-2 months of operation), resulting in downtime and production loss. Offline replacement requires temporary sealing of the pipeline, which can easily lead to unfiltered flue gas directly entering the heat recovery equipment, causing heat exchanger blockage or accelerated corrosion, and shortening the equipment life by more than 30%.

[0003] Therefore, there is an urgent need for a filtration device that can replace filter cartridges online, completing the replacement without stopping the machine, thus solving the problems of production interruption and equipment damage.

[0004] Existing heat recovery equipment for gas systems includes, but is not limited to, flues and waste heat exchangers connected to the flues. Utility Model Content

[0005] The main purpose of this utility model is to provide a gas combustion system for Yanke gas hood heating, which aims to solve the technical problem in the prior art where downtime for filter replacement affects production capacity.

[0006] To achieve the above objectives, the present invention proposes a gas combustion system for Yankee gas hood heating, comprising a flue, wherein the flue includes an upstream return flue and a downstream return flue; the upstream return flue is connected to the exhaust port of the gas Yankee gas hood system, and the end of the upstream return flue away from the Yankee gas hood is connected to the downstream return flue via a main filter assembly; the side of the downstream return flue away from the main filter assembly is connected to the inlet of a flue gas recovery device; a fan is provided inside the upstream return flue for conveying flue gas toward the side away from the Yankee gas hood; The main filter assembly includes a first flue pipe, one end of which is connected to an upstream return flue pipe via a first valve, and the end of the first flue pipe away from the first valve is connected to a sixth flue pipe via a first filter module. The end of the sixth flue pipe away from the first filter module is connected to a second valve, and the end of the second valve away from the first filter module is connected to a downstream return flue pipe. A secondary filter assembly is also connected between the upstream and downstream return smoke pipes. The secondary filter assembly includes a second smoke pipe connected to the upstream return smoke pipe. The end of the second smoke pipe away from the upstream return smoke pipe is connected to a third smoke pipe through a pressure relief module. The pressure relief module is used to transport the flue gas in the upstream return smoke pipe to the third smoke pipe. The end of the third smoke pipe away from the pressure relief module is connected to a fourth smoke pipe through a second filter module. The end of the fourth smoke pipe away from the second filter module is connected to the downstream return smoke pipe.

[0007] Preferably, the pressure relief module includes a pressure relief pipe that is closed at both ends and hollow, one end of the pressure relief pipe is connected to a second smoke pipe, and the other end is connected to a third smoke pipe; A vent ring is fixedly installed inside the pressure relief pipe, and the direction of the vent ring's buckle is the same as the extension direction of the pressure relief pipe. The pressure relief pipe is slidably connected to a plug for blocking the venting ring. The plug is located on the side of the venting ring closer to the second smoke pipe. A base plate is provided on the side of the plug closer to the second smoke pipe. Elastic components are symmetrically provided on both sides of the base plate. The elastic components are used to elastically drive the plug to block the venting ring. The pressure relief pipe is equipped with a rotating spool, which is located on the side of the plug near the second smoke pipe. The extension direction of the spool is perpendicular to the extension direction of the pressure relief pipe. A brake servo motor for driving the spool to rotate is provided outside the pressure relief pipe. A cable is wound on the spool, and the end of the cable away from the spool is connected to the base plate. The pressure relief pipe is equipped with a pressure sensor, which is located on the side of the ventilation ring near the second smoke pipe. The pressure sensor is electrically connected to the brake servo motor through a PLC controller.

[0008] Preferably, the outer diameter of the plug is a cone shape that gradually decreases toward the side away from the second flue.

[0009] Preferably, the elastic component includes a support plate disposed on the inner wall of the pressure relief pipe. The support plate is located on the side of the venting ring near the second smoke pipe. The side of the support plate near the venting ring is provided with a guide post connected to the venting ring. The extension direction of the guide post is the same as the extension direction of the pressure relief pipe. A slip ring is slidably sleeved on the guide post. A spring is also sleeved on the outer wall of the guide post. The spring is located between the slip ring and the support plate. The slip ring is connected to the base plate.

[0010] Preferably, the pressure relief module further includes a warning light installed outside the pressure relief pipe, and the warning light is electrically connected to the PLC controller.

[0011] Preferably, the first filter module includes a first filter tube, a first filter element is detachably connected inside the first filter tube, and a first cover plate is detachably connected to the two ends of the first filter tube. The end of the first flue pipe opposite to the first valve passes through a first cover plate and is connected to the inside of the first filter pipe. The end of the sixth flue pipe opposite to the second valve passes through another first cover plate and is connected to the inside of the first filter pipe.

[0012] Preferably, the second filter module includes a second filter tube, a second filter element is detachably connected inside the second filter tube, and a second cover plate is detachably connected to each of the two ends of the second filter tube. The end of the third smoke pipe that is away from the second filter module passes through a second cover plate and is connected to the inside of the second filter pipe. The end of the fourth smoke pipe that is away from the third valve passes through another second cover plate and is connected to the inside of the second filter pipe.

[0013] Preferably, the end of the fourth smoke pipe opposite to the second filter module is provided with a third valve, the end of the third valve opposite to the fourth smoke pipe is connected to the fifth smoke pipe, and the end of the fifth smoke pipe opposite to the third valve is connected to the downstream return smoke pipe.

[0014] Preferably, sealing rings are respectively provided between the first cover plate and the opening of the first filter tube and between the second cover plate and the opening of the second filter tube.

[0015] Preferably, there is a gap between the first filter element and the first cover plate; there is also a gap between the second filter element and the second cover plate.

[0016] In the technical solution of this utility model, when the main filter component (first filter module) is blocked, the airflow in the upstream flue gas return pipe can enter the secondary filter component (second filter module) through the pressure relief module, and the secondary filter module continues to filter the flue gas. The system can maintain continuous operation without stopping the machine, and completely avoid production interruption and capacity loss caused by filter replacement. When replacing the main filter module filter element, the first valve (cutting off the upstream flue gas from entering the main filter component) and the second valve (preventing the downstream flue gas from leaking back) can be closed. There is no need to temporarily block the pipeline. Structurally, this eliminates the risk of unfiltered flue gas directly entering the heat recovery equipment, protects the heat exchanger from blockage or corrosion, and avoids shortening the equipment's lifespan. The main and auxiliary filter components form a backup and complement each other. When one component is under maintenance, the other component can work normally, ensuring that the flue gas always passes through the filter before entering the recovery device, so as to achieve filter replacement without shutting down the machine. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the first filter module structure of this utility model; Figure 3 This is a schematic diagram of the second filter module structure of this utility model; Figure 4 This is a schematic diagram of the pressure relief module structure of this utility model.

[0019] Explanation of icon numbers: 1. Upstream return smoke pipe; 2. Downstream return smoke pipe; 3. First smoke pipe; 4. First valve; 5. Sixth smoke pipe; 6. Second valve; 7. Fifth smoke pipe; 8. Third valve; 9. Third smoke pipe; 10. Fourth smoke pipe; 11. Second smoke pipe; 12. Second filter module; 121. Second filter tube; 122. Second cover plate; 123. Second filter element; 13. First filter module; 131. First filter tube; 132. First cover plate; 133. First filter element; 14. Pressure relief module; 141. Pressure relief pipe; 142. Vent ring; 143. Plug; 144. Slip ring; 145. Spring; 146. Guide post; 147. Support plate; 148. Brake servo motor; 149. Winding spool; 1410. Cable; 1411. Base plate.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0023] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0026] This utility model proposes a gas combustion system for Yanke gas hood heating.

[0027] Please refer to Figures 1 to 4 The gas combustion system for Yankee gas hood heating includes a flue, which includes an upstream return flue 1 and a downstream return flue 2. The upstream return flue 1 is connected to the exhaust port of the gas Yankee gas hood system. The end of the upstream return flue away from the Yankee gas hood is connected to the downstream return flue 2 through a main filter assembly. The side of the downstream return flue away from the main filter assembly is connected to the air inlet of a flue gas recovery device. A fan is installed in the upstream return flue 1 to transport the flue gas toward the side away from the Yankee gas hood. The main filter assembly includes a first smoke pipe 3. One end of the first smoke pipe 3 is connected to the upstream return smoke pipe 1 through a first valve 4. The end of the first smoke pipe 3 away from the first valve 4 is connected to the sixth smoke pipe 5 through a first filter module 13. The end of the sixth smoke pipe 5 away from the first filter module 13 is connected to a second valve 6. The end of the second valve 6 away from the first filter module 13 is connected to the downstream return smoke pipe 2. A secondary filter assembly is also connected between the upstream return smoke pipe 1 and the downstream return smoke pipe 2. The secondary filter assembly includes a second smoke pipe 11 connected to the upstream return smoke pipe 1. The end of the second smoke pipe 11 away from the upstream return smoke pipe 1 is connected to a third smoke pipe 9 through a pressure relief module 14. The pressure relief module 14 is used to transport the flue gas in the upstream return smoke pipe 1 to the third smoke pipe 9. The end of the third smoke pipe 9 away from the pressure relief module 14 is connected to a fourth smoke pipe 10 through a second filter module 12. The end of the fourth smoke pipe 10 away from the second filter module 12 is connected to the downstream return smoke pipe 2.

[0028] In the technical solution of this utility model, when the main filter assembly (first filter module 13) is blocked, the airflow in the upstream return flue pipe 1 can enter the secondary filter assembly (second filter module 12) through the pressure relief module 14, and the secondary filter module continues to filter the flue gas. The system can maintain continuous operation without stopping the machine, and completely avoid production interruption and capacity loss caused by filter replacement. When replacing the filter element of the main filter module, the first valve 4 (cut off the upstream flue gas from entering the main filter component) and the second valve 6 (prevent the downstream flue gas from leaking back) can be closed. There is no need to temporarily block the pipeline. This structurally eliminates the risk of unfiltered flue gas directly entering the heat recovery equipment, protects the heat exchanger from blockage or corrosion, and avoids shortening the equipment life. The main and auxiliary filter components form a backup and complement each other. When one component is under maintenance, the other component can work normally, ensuring that the flue gas always passes through the filter before entering the recovery device, so as to achieve filter replacement without shutting down the machine.

[0029] Please refer to the appendix. Figure 4 The pressure relief module 14 includes a pressure relief pipe 141 that is closed at both ends and hollow. One end of the pressure relief pipe 141 is connected to the second smoke pipe 11, and the other end is connected to the third smoke pipe 9. A venting ring 142 is fixedly provided inside the pressure relief pipe 141, and the direction of the ring buckle of the venting ring 142 is the same as the extension direction of the pressure relief pipe 141. The pressure relief pipe 141 is slidably connected to a plug 143 for blocking the venting ring 142. The plug 143 is located on the side of the venting ring 142 near the second smoke pipe 11. The plug 143 is provided with a base plate 1411 on the side near the second smoke pipe 11. Elastic members are symmetrically provided on both sides of the base plate 1411. The elastic members are used to elastically drive the plug 143 to block the venting ring 142. A winding shaft 149 is rotatably disposed inside the pressure relief pipe 141. The winding shaft 149 is located on the side of the plug 143 near the second smoke pipe 11. The extension direction of the winding shaft 149 is perpendicular to the extension direction of the pressure relief pipe 141. A brake servo motor 148 for driving the winding shaft 149 to rotate is disposed outside the pressure relief pipe 141. A cable 1410 is wound on the winding shaft 149. The end of the cable 1410 away from the winding shaft 149 is connected to the base plate 1411. A pressure sensor is installed inside the pressure relief pipe 141. The pressure sensor is located on the side of the ventilation ring 142 near the second smoke pipe 11. The pressure sensor is electrically connected to the brake servo motor 148 through a PLC controller.

[0030] The air pressure sensor monitors the air pressure upstream of the main filter assembly (the side of the ventilation ring 142 near the second flue 11) in real time. When the air pressure exceeds the preset value (i.e. the first filter module 13 is blocked), it automatically sends a signal to the PLC controller, which controls the brake servo motor 148 to rotate and the winding cable 1410 to drive the plug 143 away from the ventilation ring 142. The switching of "main filter → auxiliary filter" can be completed without manual intervention, avoiding system shutdown or flue gas leakage caused by the lag of manual judgment. Through the transmission structure of the winding shaft 149 and the cable 1410, the opening action of the plug 143 is precise and controllable, avoiding unstable switching caused by manual operation; at the same time, when the main filter module returns to normal (the air pressure drops below the threshold), the elastic component can drive the plug 143 to automatically reset the blockage ventilation ring 142, ensuring that the flue gas only flows through the main filter component during normal operation, thus ensuring filtration efficiency. Automatic control logic reduces the frequency and difficulty of manual inspections, reduces reliance on the experience of maintenance personnel, improves the stability and intelligence of system operation, and further reduces the risk of equipment damage caused by human error.

[0031] Please refer to the appendix. Figure 4 The outer diameter of the plug 143 is a cone that gradually decreases toward the side away from the second smoke pipe 11.

[0032] The outer diameter of the conical plug 143 gradually decreases towards the side away from the second flue pipe 11. Its conical surface can form a tight-fitting sealing structure with the inner wall of the ventilation ring 142. During normal operation, it can effectively block the leakage of flue gas to the secondary filter assembly and avoid the decrease in filtration efficiency caused by the simultaneous intake of air into the main and secondary filter assemblies. The conical structure reduces the rigid collision between the plug 143 and the vent ring 142, reduces wear, and has a longer sealing life compared to the flat plug 143, reducing maintenance frequency.

[0033] Please refer to the appendix. Figure 4The elastic component includes a support plate 147 disposed on the inner wall of the pressure relief pipe 141. The support plate 147 is located on the side of the ventilation ring 142 near the second smoke pipe 11. The side of the support plate 147 near the ventilation ring 142 is provided with a guide post 146 connected to the ventilation ring 142. The extension direction of the guide post 146 is the same as the extension direction of the pressure relief pipe 141. A slip ring 144 is slidably sleeved on the guide post 146. A spring 145 is also sleeved on the outer wall of the guide post 146. The spring 145 is located between the slip ring 144 and the support plate 147. The slip ring 144 is connected to the base plate 1411.

[0034] The cooperation between the guide post 146 and the slip ring 144 provides a stable guide for the base plate 1411 (driving the plug 143 to move), preventing the plug 143 from shifting under the action of elastic force or the tension of the cable 1410, ensuring that the plug 143 can be accurately aligned with the vent ring 142, and ensuring the reliability of the seal and the accuracy of the action during switching. Spring 145 is sleeved on guide post 146, and its elastic force is transmitted along the axial direction of guide post 146. It can stably push slip ring 144, base plate 1411 and plug 143 to fit vent ring 142 for a long time, avoiding uneven sealing force caused by spring 145 offset, and preventing flue gas from leaking from the gap between plug 143 and vent ring 142 during normal operation. The support plate 147, guide column 146 and other components are all rigid structures that are not easily damaged, and the spring 145 is a standardized part that is easy to replace. Compared with complex elastic structures (such as rubber parts), they have a longer service life and reduce maintenance costs.

[0035] Please refer to the appendix. Figure 4 The pressure relief module 14 also includes a warning light installed outside the pressure relief pipe 141, and the warning light is electrically connected to the PLC controller.

[0036] When the air pressure sensor detects that the first filter module 13 is blocked (air pressure exceeds the threshold), the PLC controller will simultaneously control the warning light to light up, so as to inform the maintenance personnel that "the main filter component needs to be replaced" with an intuitive visual signal. This eliminates the need for staff to continuously monitor system parameters and reduces the workload of manual inspection. The warning light prompts maintenance personnel to replace the main filter element in a timely manner when the secondary filter element is operating alone, thus preventing the secondary filter element from being continuously overloaded and prematurely blocked due to the main filter element not being replaced for a long time, and ensuring that the dual-circuit backup function is always effective. Clear fault indications can help maintenance personnel quickly locate problematic components (main filter modules) without having to troubleshoot them one by one, shortening fault response time and further reducing potential operational risks to the system.

[0037] Please refer to the appendix. Figure 2The first filter module 13 includes a first filter tube 131, a first filter element 133 is detachably provided inside the first filter tube 131, and a first cover plate 132 is detachably connected to the two ends of the first filter tube 131. The end of the first smoke pipe 3 facing away from the first valve 4 passes through a first cover plate 132 and is connected to the inside of the first filter pipe 131. The end of the sixth smoke pipe 5 facing away from the second valve 6 passes through another first cover plate 132 and is connected to the inside of the first filter pipe 131.

[0038] When replacing the first filter element 133, it is not necessary to disassemble the connection between the first smoke pipe 3, the sixth smoke pipe 5 and the first filter pipe 131. Only the first cover plates 132 at both ends need to be removed to take out the old filter element and install the new filter element. The operation steps are simplified and the replacement time is greatly shortened. The independent first filter tube 131 structure completely isolates the filter replacement process from the main pipeline of the system (upstream / downstream return smoke pipe 2) (the first and second valves must be closed first), preventing smoke leakage or impurities from falling into the main pipeline during maintenance, thus improving maintenance safety; The detachable structure allows for the replacement of different types of first filter elements 133 according to the composition of the flue gas (such as special filter elements for dust or tar), enhancing the system's adaptability to different operating conditions, while facilitating the cleaning and reuse of filter elements (if the filter elements are washable), reducing consumable costs.

[0039] Please refer to the appendix. Figure 3 The second filter module 12 includes a second filter tube 121, a second filter element 123 is detachably provided inside the second filter tube 121, and a second cover plate 122 is detachably connected to the two ends of the second filter tube 121. The end of the third smoke pipe 9 that is away from the second filter module 12 passes through a second cover plate 122 and is connected to the inside of the second filter pipe 121. The end of the fourth smoke pipe 10 that is away from the third valve 8 passes through another second cover plate 122 and is connected to the inside of the second filter pipe 121.

[0040] When the secondary filter assembly (second filter module 12) needs to replace the filter element, the system can be switched back to the main filter assembly (the main filter element has been replaced), then the third valve 8 can be closed, and the second cover plate 122 can be removed to replace the second filter element 123. The whole process does not require stopping the machine, realizing the alternating online replacement of the main and secondary filter elements, and completely solving the industry pain point of "stopping the machine to replace the filter element". With the same structure as the main filter module, the filter element can be replaced simply by removing the second cover plate 122. The operation is standardized, reducing the learning cost for maintenance personnel. At the same time, the independent second filter tube 121 can prevent impurities from contaminating the downstream return smoke pipe 2 during maintenance. The convenient replacement of the secondary filter element ensures that the dual-path filtration system is always in a "one-in-use, one-in-standby" or "dual-use" state, avoiding system downtime due to the inability to replace any filter element in time, and further improving production continuity.

[0041] Please refer to the appendix. Figure 2 The fourth smoke pipe 10 is provided with a third valve 8 at one end away from the second filter module 12. The third valve 8 is connected to the fifth smoke pipe 7 at one end away from the fourth smoke pipe 10. The fifth smoke pipe 7 is connected to the downstream return smoke pipe 2 at one end away from the third valve 8.

[0042] When the third valve 8 is closed, it is used to replace or clean the second filter element 123 in the second filter module 12 to prevent flue gas leakage from the downstream flue pipe 2. Under normal conditions, the third valve 8 remains open.

[0043] Please refer to the appendix. Figure 2-3 Sealing rings are respectively provided between the opening of the first cover plate 132 and the first filter tube 131 and between the opening of the second cover plate 122 and the second filter tube 121.

[0044] The sealing rings between the first cover plate 132 and the first filter tube 131, and between the second cover plate 122 and the second filter tube 121, can fill the gap between the cover plate and the tube opening, preventing flue gas from leaking from the gap during the filtration process (or when replacing the filter element), ensuring that all flue gas enters the downstream after being filtered by the filter element, and completely solving the problem of "some unfiltered flue gas escaping".

[0045] Please refer to the appendix. Figure 2-3 A gap is left between the first filter element 133 and the first cover plate 132; a gap is left between the second filter element 123 and the second cover plate 122.

[0046] The gaps allow the flue gas to diffuse within the gaps after entering the filter tube, and then flow evenly across the entire filter surface of the filter element, significantly increasing the contact area between the flue gas and the filter element. Compared to the structure where "flue gas directly impacts a part of the filter element", this structure can more effectively remove impurities such as dust and tar, and reduce the amount of unfiltered impurities entering the heat recovery equipment.

[0047] The specific operation method of this utility model is as follows: Normal operation phase: When the fan is turned on, the flue gas discharged from the gas-fired Yankee hood system is transported through the upstream return flue pipe 1. At this time, the plug 143 in the pressure relief module 14 blocks the ventilation ring 142 under the action of the elastic component. The flue gas only flows through the main filter assembly - enters the first flue pipe 3 through the first valve 4, and after being filtered by the first filter module 13 (first filter element 133), it enters the downstream return flue pipe 2 through the sixth flue pipe 5 and the second valve 6, and finally flows into the flue gas recovery device. The secondary filter assembly is in standby mode, and the third valve 8 remains open.

[0048] Blockage detection and automatic switching: When the first filter element 133 is blocked, the air pressure in the upstream return smoke pipe 1 increases. The air pressure sensor in the pressure relief pipe 141 detects that the air pressure exceeds the preset value and immediately sends a signal to the PLC controller. The PLC synchronously controls the brake servo motor 148 to rotate (winding cable 1410), and the warning light illuminates: the cable 1410 drives the plug 143 away from the ventilation ring 142, and the flue gas switches to the secondary filter component. It enters the second filter module 12 (second filter element 123) through the second smoke pipe 11, pressure relief pipe 141, and third smoke pipe 9 for filtration, and then enters the downstream return smoke pipe 2 through the fourth smoke pipe 10, third valve 8, and fifth smoke pipe 7, realizing continuous operation without stopping the machine.

[0049] Main filter element replacement: After the maintenance personnel see the warning light and confirm that the auxiliary filter assembly is working normally, they close the first and second valves to cut off the main filter assembly's passage, remove the first cover plates 132 at both ends of the first filter tube 131, take out the old first filter element 133 and replace it with a new filter element, reinstall the first cover plate 132, and then open the first and second valves. The main filter assembly resumes operation. The PLC detects that the main air pressure is normal, controls the brake servo motor 148 to reverse, the cable 1410 loosens, and the plug 143 resets and seals the vent ring 142 under the action of the elastic component. The warning light goes out.

[0050] Sub-filter replacement: After the main filter assembly is restored, close the third valve 8 to cut off the passage of the sub-filter assembly, remove the second cover plates 122 at both ends of the second filter tube 121, replace the second filter element 123 and put the cover plates back on, open the third valve 8, and the sub-filter assembly is ready for use again, completing the whole process without stopping the machine for maintenance.

[0051] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A gas combustion system for Yankee gas hood heating, characterized in that, The system includes a flue, which comprises an upstream return flue and a downstream return flue. The upstream return flue is connected to the exhaust port of a gas-fired Yankee hood system. One end of the upstream return flue, away from the Yankee hood, is connected to the downstream return flue via a main filter assembly. The side of the downstream return flue, away from the main filter assembly, is connected to the inlet of a flue gas recovery device. A fan is installed inside the upstream return flue to direct the flue gas toward the side away from the Yankee hood. The main filter assembly includes a first flue pipe, one end of which is connected to an upstream return flue pipe via a first valve, and the end of the first flue pipe away from the first valve is connected to a sixth flue pipe via a first filter module. The end of the sixth flue pipe away from the first filter module is connected to a second valve, and the end of the second valve away from the first filter module is connected to a downstream return flue pipe. A secondary filter assembly is also connected between the upstream and downstream return smoke pipes. The secondary filter assembly includes a second smoke pipe connected to the upstream return smoke pipe. The end of the second smoke pipe away from the upstream return smoke pipe is connected to a third smoke pipe through a pressure relief module. The pressure relief module is used to transport the flue gas in the upstream return smoke pipe to the third smoke pipe. The end of the third smoke pipe away from the pressure relief module is connected to a fourth smoke pipe through a second filter module. The end of the fourth smoke pipe away from the second filter module is connected to the downstream return smoke pipe.

2. The gas combustion system for Yankee gas hood heating according to claim 1, characterized in that, The pressure relief module includes a pressure relief pipe that is closed at both ends and hollow, with one end of the pressure relief pipe connected to a second smoke pipe and the other end connected to a third smoke pipe; A vent ring is fixedly installed inside the pressure relief pipe, and the direction of the vent ring's buckle is the same as the extension direction of the pressure relief pipe. The pressure relief pipe is slidably connected to a plug for blocking the venting ring. The plug is located on the side of the venting ring closer to the second smoke pipe. A base plate is provided on the side of the plug closer to the second smoke pipe. Elastic components are symmetrically provided on both sides of the base plate. The elastic components are used to elastically drive the plug to block the venting ring. The pressure relief pipe is equipped with a rotating spool, which is located on the side of the plug near the second smoke pipe. The extension direction of the spool is perpendicular to the extension direction of the pressure relief pipe. A brake servo motor for driving the spool to rotate is provided outside the pressure relief pipe. A cable is wound on the spool, and the end of the cable away from the spool is connected to the base plate. The pressure relief pipe is equipped with a pressure sensor, which is located on the side of the ventilation ring near the second smoke pipe. The pressure sensor is electrically connected to the brake servo motor through a PLC controller.

3. The gas combustion system for Yankee gas hood heating according to claim 2, characterized in that, The outer diameter of the plug is a cone shape that gradually decreases towards the side away from the second flue.

4. The gas combustion system for Yankee gas hood heating according to claim 2, characterized in that, The elastic component includes a support plate disposed on the inner wall of the pressure relief pipe. The support plate is located on the side of the venting ring near the second smoke pipe. A guide post connected to the venting ring is provided on the side of the support plate near the venting ring. The extension direction of the guide post is the same as the extension direction of the pressure relief pipe. A slip ring is slidably sleeved on the guide post. A spring is also sleeved on the outer wall of the guide post. The spring is located between the slip ring and the support plate. The slip ring is connected to the base plate.

5. The gas combustion system for Yankee gas hood heating according to claim 1, characterized in that, The pressure relief module also includes a warning light installed outside the pressure relief pipe, which is electrically connected to the PLC controller.

6. The gas combustion system for Yankee gas hood heating according to claim 1, characterized in that, The first filter module includes a first filter tube, a first filter element is detachably connected inside the first filter tube, and a first cover plate is detachably connected to the two ends of the first filter tube. The end of the first flue pipe opposite to the first valve passes through a first cover plate and is connected to the inside of the first filter pipe. The end of the sixth flue pipe opposite to the second valve passes through another first cover plate and is connected to the inside of the first filter pipe.

7. The gas combustion system for Yankee gas hood heating according to claim 1, characterized in that, The second filter module includes a second filter tube, a second filter element is detachably connected inside the second filter tube, and a second cover plate is detachably connected to the two ends of the second filter tube. The end of the third smoke pipe that is away from the second filter module passes through a second cover plate and is connected to the inside of the second filter pipe. The end of the fourth smoke pipe that is away from the third valve passes through another second cover plate and is connected to the inside of the second filter pipe.

8. The gas combustion system for Yankee gas hood heating according to claim 1, characterized in that, The fourth smoke pipe is provided with a third valve at the end opposite to the second filter module. The end of the third valve opposite to the fourth smoke pipe is connected to the fifth smoke pipe. The end of the fifth smoke pipe opposite to the third valve is connected to the downstream return smoke pipe.

9. The gas combustion system for Yankee gas hood heating according to claim 6, characterized in that, Sealing rings are respectively provided between the first cover plate and the opening of the first filter tube, and between the second cover plate and the opening of the second filter tube.

10. The gas combustion system for Yankee gas hood heating according to claim 7, characterized in that, There is a gap between the first filter element and the first cover plate; there is a gap between the second filter element and the second cover plate.

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