M pipe cooling system for flue gas of acid-making incinerator

Abstract

The utility model discloses an acid making incinerator flue gas M pipe cooling system, technical scheme is as follows: including acid making incinerator, the flue gas export of acid making incinerator is connected with waste heat boiler, draft fan in proper order through pipeline, and the import and export of waste heat boiler is connected with the M pipe cooler of cutting out system through flue gas pipe bypass, the M pipe cooler includes the M pipe of multiple pairs flue gas cooling, and the import and export of multiple M pipes is provided with dust remover. The utility model passes through setting up the M pipe cooler as the bypass standby cooling device of waste heat boiler, can realize no parking overhauling when waste heat boiler failure, is equipped with efficient dust removal device simultaneously, has improved system operation stability significantly, has reduced the frequency of shutdown overhauling, has realized no parking overhauling maintenance.

Description

Technical Field

[0001] This utility model relates to the field of incinerator flue gas, specifically to an M-pipe cooling system for acid incinerator flue gas. Background Technology

[0002] The high-temperature flue gas generated by the acid incinerator in the acid production system is usually as high as 1000-1200℃. Traditional processes rely entirely on waste heat boilers as the only cooling equipment, and this single cooling method has serious technical defects.

[0003] In actual operation, waste heat boilers frequently experience malfunctions such as tube rupture, ash blockage, and tube corrosion. Industry statistics show that the average annual incidence of these malfunctions is as high as 15%-20%. Once a malfunction occurs, the entire acid production system must be shut down for repairs, resulting in huge economic losses; a single shutdown can cause direct losses of up to 120,000 yuan per day. More seriously, such sudden shutdowns disrupt the entire production plan and affect the normal operation of downstream processes. Furthermore, traditional systems lack effective backup cooling devices, making it impossible to perform maintenance without stopping the system, forcing companies to bear high downtime costs. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a flue gas M-pipe cooling system for acid incinerators.

[0005] This utility model is achieved through the following technical solution:

[0006] This application provides a flue gas M-tube cooling system for an acid incinerator, the technical solution of which is as follows: it includes an acid incinerator, the flue gas outlet of which is connected in sequence to a waste heat boiler and an induced draft fan via pipelines, the inlet and outlet of the waste heat boiler are connected to an M-tube cooler that cuts it out of the system via a flue gas bypass, the M-tube cooler includes multiple M-tubes for cooling the flue gas, and dust collectors are installed at the inlet and outlet of the multiple M-tubes.

[0007] Furthermore, this application also proposes that the dust collector includes ash bins respectively installed at the inlet and outlet of the M-pipe, the upper part of the ash bins being connected to the inlet and outlet of the M-pipe via connecting bins, and the sides of the ash bins at the inlet and outlet of the M-pipe being respectively connected to a smoke guide pipe and a smoke outlet pipe.

[0008] Furthermore, this application also proposes that the bottom of the ash silo is provided with an ash discharge outlet, and the ash discharge outlet is equipped with a control valve.

[0009] Furthermore, this application also proposes that the flue pipe and the exhaust pipe are connected to the inlet and outlet of the waste heat boiler via a bypass, that control valves are installed on the flue pipe and the exhaust pipe, and that shut-off valves are installed at the inlet and outlet of the waste heat boiler.

[0010] Furthermore, this application also proposes that the lower central end of multiple M-tubes is connected to a corresponding support box, the lower part of which is connected to a gray pipe, and the outlet of the gray pipe is bolted to a blocking plate.

[0011] Furthermore, this application also proposes that the M-tube and the connecting compartment are provided with heat dissipation fins for heat dissipation.

[0012] Furthermore, this application also proposes that the ash silo and support box are installed on a support platform, and adjacent M-tubes are reinforced and fixed by connecting rods.

[0013] Compared with existing technologies, the beneficial effects of this utility model are as follows: By setting the M-tube cooler as a bypass backup cooling device for the waste heat boiler, this utility model can achieve non-stop maintenance when the waste heat boiler fails. At the same time, it is equipped with a high-efficiency dust removal device, which significantly improves the stability of system operation, reduces the frequency of shutdown maintenance, and realizes non-stop maintenance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the system of this utility model;

[0015] Figure 2 This is a three-dimensional schematic diagram of a practical M-tube cooler;

[0016] In the diagram: 1. Sour incinerator; 2. Waste heat boiler; 3. Exhaust fan; 4. Smoke duct; 41. Control valve; 5. Smoke outlet pipe; 6. M-tube cooler; 7. Ash silo; 8. Connecting silo; 9. M-tube; 10. Heat dissipation fins; 11. Support box; 12. Ash pipe. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0018] like Figure 1-2 As shown, this application proposes an M-tube cooling system for flue gas from an acid incinerator, including an acid incinerator. The flue gas outlet of the acid incinerator is connected in sequence to a waste heat boiler and an induced draft fan via pipelines. The inlet and outlet of the waste heat boiler are connected to an M-tube cooler that cuts it off from the system via a flue gas bypass. The M-tube cooler includes multiple M-tubes for cooling the flue gas, and dust collectors are installed at the inlet and outlet of the multiple M-tubes.

[0019] The acid incinerator generates high-temperature flue gas, and its outlet is connected to a waste heat boiler via pipeline. The waste heat boiler recovers waste heat from the flue gas. An induced draft fan provides the power for flue gas flow. An M-tube cooler is connected via a bypass to the inlet and outlet of the waste heat boiler, allowing it to be disconnected from the system in case of boiler failure. The M-tubes are made of metal, specifically high-temperature resistant alloy steel, with a preferred diameter of 200-400 mm and a wall thickness of 5-10 mm. Multiple M-tubes can be arranged in parallel, with a spacing of 1.5-2 times the tube diameter. A dust collector is installed at the inlet and outlet of the M-tubes to collect dust from the flue gas; the dust collector can be a gravity settling chamber. As a preferred embodiment, baffles can be installed inside the M-tubes to enhance heat exchange. Furthermore, the outer surface of the M-tubes can be treated with anti-corrosion measures to improve service life.

[0020] This technical solution solves the problem of necessitating a complete shutdown in traditional processes where the waste heat boiler is the sole cooling device, especially in cases of boiler malfunction. When the waste heat boiler experiences issues such as tube rupture or ash blockage, the flue gas can be switched to the M-tube cooler for cooling. The M-tube, with its special design, significantly increases the contact area and residence time between the flue gas and the cooling medium, achieving rapid cooling of the high-temperature flue gas. This extends equipment lifespan and reduces maintenance, enabling uninterrupted system operation. Compared to existing technologies, this solution significantly improves system reliability and reduces downtime losses due to equipment failure. Specifically, the M-tube cooler has a simple structure, is easy to maintain, and provides stable cooling, effectively handling high-temperature flue gas of 1000-1200℃.

[0021] Furthermore, this application also proposes that in the flue gas M-tube cooling system of the acid incinerator, the dust collector includes ash bins respectively installed at the inlet and outlet of the M-tube, the upper part of the ash bins being connected to the inlet and outlet of the M-tube via connecting bins, and the sides of the ash bins at the inlet and outlet of the M-tube being respectively connected to a flue gas guide pipe and a flue gas outlet pipe.

[0022] Specifically, the ash silo, as the core component of the dust removal device, is structurally designed so that its top is directly connected to the inlet and outlet of the M-pipe via a connecting compartment, forming a sealed flue gas passage. The connecting compartment is connected to the M-pipe using a flange connection to ensure airtightness at the interface. The flue gas guide pipe and the flue gas outlet pipe are made of high-temperature resistant stainless steel, with a pipe diameter designed to be 300-500mm to accommodate different flue gas flow requirements. As a preferred implementation, the ash silo volume is designed to be 5-8 times the cross-sectional area of ​​the M-pipe to provide sufficient settling space.

[0023] This technical solution achieves the following effects by optimizing the dust collector structure: First, the split-type ash hopper design ensures effective collection of dust both when it enters and exits the M-tube, preventing secondary dust re-entrainment within the system. Second, the straight-through structure connecting the hoppers reduces gas flow resistance, and the rational arrangement of the guide and outlet pipes ensures smooth gas flow in the bypass system. Finally, this design facilitates routine maintenance; accumulated ash can be quickly cleaned through the inspection port on the side of the ash hopper, significantly reducing system downtime for maintenance. Actual testing shows that this structure can increase dust removal efficiency to over 95% while extending the system maintenance cycle to 2-3 times that of traditional structures.

[0024] Furthermore, this application also proposes that an ash discharge outlet is provided at the bottom of the ash silo, and a control valve is installed at the ash discharge outlet.

[0025] By installing a discharge outlet with a control valve at the bottom of the ash hopper, periodic cleaning of accumulated ash is achieved. After the system has been running for a period of time, the control valve can be opened to discharge the accumulated ash, preventing ash hopper blockage from affecting normal system operation. This design solves the problem of traditional dust removal devices requiring shutdown for cleaning, improving the continuity and stability of system operation. Compared with existing technologies, this solution has a simple structure and is easy to operate, allowing ash cleaning operations to be completed without affecting system operation.

[0026] Furthermore, this application also proposes that the flue pipe and the exhaust pipe are connected to the inlet and outlet of the waste heat boiler via bypass, and that control valves are installed on the flue pipe and the exhaust pipe, while shut-off valves are installed at the inlet and outlet of the waste heat boiler.

[0027] Specifically, the flue gas inlet and outlet pipes are connected to the waste heat boiler inlet and outlet via a bypass connection, which can be achieved using flange connections or welding. This technical solution, by setting up a bypass system at the waste heat boiler inlet and outlet, and equipping it with control valves and shut-off valves, achieves rapid shut-off of the waste heat boiler and precise control of flue gas flow. When the waste heat boiler malfunctions, the flue gas can be switched to the M-tube cooling system by closing the shut-off valve and opening the control valve, avoiding system shutdown. Compared with existing technologies, this solution significantly improves the system's reliability and maintainability, solving the problem of total production line shutdown caused by waste heat boiler failure in traditional processes.

[0028] Furthermore, this application also proposes that the lower central end of multiple M-tubes is connected to a corresponding support box, the lower part of the support box is connected to a gray pipe, and the outlet of the gray pipe is bolted to a plug plate.

[0029] Specifically, the support box is used to support and fix the lower ends of multiple M-tubes. The support box can be welded from steel plates and reinforced internally with ribs to improve structural strength. The ash pipes are welded to the support box for easy disassembly and maintenance. The diameter of the ash pipes is preferably 200-300mm to meet ash discharge requirements. The blocking plate is fixed to the ash pipe outlet with bolts and sealed with a high-temperature resistant rubber gasket. When ash accumulation needs to be cleaned, the blocking plate can be removed for ash discharge. As a preferred embodiment, a guide plate can be installed inside the support box to allow dust in the flue gas to fall more smoothly into the ash pipes.

[0030] Therefore, this technical solution solves the installation complexity caused by independently fixing multiple M-tubes by providing centralized support for the M-tubes through a support box. Simultaneously, the ash pipe structure facilitates centralized collection and cleaning of dust generated during the M-tube cooling process. Compared with existing technologies, this structure simplifies the equipment installation process, improves system maintenance convenience, and allows for rapid ash removal through the ash pipes in case of waste heat boiler failure, reducing system downtime. Specifically, the centralized support design of the support box ensures more even stress distribution on the M-tube assembly, avoiding deformation caused by localized stress concentration, while the modular ash pipe structure eliminates the need to treat each M-tube individually during ash removal, significantly improving maintenance efficiency.

[0031] Furthermore, this application also proposes that heat dissipation fins be provided on the M-tube and the connecting compartment for heat dissipation.

[0032] The heat dissipation fins can be made of the same metal material as the M-tube, and are connected to the M-tube and the outer wall of the connecting compartment by welding or mechanical fixing. In practice, the fins can be arranged in a ring array or longitudinally parallel arrangement, with the fin spacing controlled within the range of 5-15mm to optimize heat dissipation. As a preferred embodiment, the fin surface can be anodized to enhance corrosion resistance. When high-temperature flue gas passes through the M-tube, heat is conducted to the fins through the tube wall, thereby increasing the heat dissipation area and accelerating the diffusion of heat to the surrounding environment.

[0033] This technical solution effectively enhances the passive heat dissipation capacity of the system by adding heat dissipation fins to key heat transfer components. When the waste heat boiler is shut down due to a malfunction, the high-temperature flue gas is forcibly cooled through the M-tube cooler. At this time, the heat dissipation fins can help reduce the wall temperature of the M-tube and connecting compartment, preventing a decrease in material strength due to localized overheating. Compared with the traditional structure without fins, the tube wall temperature can be reduced by 80-120℃ under the same operating conditions, thereby extending the service life of the equipment and improving the reliability of system operation. Specifically, this design solves the technical problem of overheating of the auxiliary cooling device itself in bypass operation, achieving stable heat dissipation of the system under emergency conditions.

[0034] Furthermore, this application also proposes that the ash silo and support box are installed on the support platform, and adjacent M-tubes are reinforced and fixed by connecting rods.

[0035] Specifically, the support platform is constructed from welded steel, with a surface covered in anti-slip steel plates and guardrails along its edges. The ash silo and support box are fixed to the support platform with anchor bolts, and leveling is required during installation. The connecting rods are made of high-strength alloy steel, with flanges at both ends connecting to the outer wall of the M-tube. The spacing between the connecting rods is set to 1.5-2 meters based on the length of the M-tube.

[0036] This technical solution achieves centralized fixation of the ash silo and support box through a support platform, and uses connecting rods to reinforce the M-tube laterally. This solves the technical problem of M-tubes being prone to vibration and displacement under the impact of high-temperature flue gas. The support platform provides a stable installation foundation, and the connecting rods form a spatial mesh support structure, which can effectively suppress the radial vibration of the M-tube. Compared with existing technologies, this structure increases the overall rigidity of the M-tube cooling system by approximately 40%, significantly reduces structural stress during equipment operation, and extends the service life of the M-tube. Specifically, under 1200℃ flue gas conditions, the M-tube amplitude decreased from 3.2mm to below 1.5mm, and no loosening occurred at the connection between the ash silo and the support box.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A flue gas cooling system for an acid incinerator, comprising an acid incinerator (1), wherein the flue gas outlet of the acid incinerator (1) is connected in sequence to a waste heat boiler (2) and an induced draft fan (3) via pipelines, characterized in that: The waste heat boiler (2) is connected to an M-tube cooler (6) that cuts it out of the system via a flue gas bypass at its inlet and outlet. The M-tube cooler (6) includes multiple M-tubes (9) for cooling the flue gas, and dust collectors are installed at the inlet and outlet of the multiple M-tubes (9).

2. The acid incinerator flue gas M-pipe cooling system according to claim 1, characterized in that: The dust collector includes ash bins (7) respectively installed at the inlet and outlet of the M pipe (9). The upper part of the ash bins (7) is connected to the inlet and outlet of the M pipe (9) via a connecting bin (8). The sides of the ash bins (7) at the inlet and outlet of the M pipe (9) are respectively connected to a smoke guide pipe (4) and a smoke outlet pipe (5).

3. The acid incinerator flue gas M-pipe cooling system according to claim 2, characterized in that: The bottom of the ash silo (7) is provided with an ash discharge outlet, which is equipped with a control valve.

4. The acid incinerator flue gas M-pipe cooling system according to claim 2, characterized in that: The flue pipe (4) and the flue outlet pipe (5) are connected to the inlet and outlet of the waste heat boiler (2) via bypass. Control valves (41) are installed on the flue pipe (4) and the flue outlet pipe (5). Shut-off valves are installed at the inlet and outlet of the waste heat boiler (2).

5. The acid incinerator flue gas M-pipe cooling system according to claim 1, characterized in that: Multiple M-tubes (9) are connected at their central lower ends to the corresponding support box (11). The lower part of the support box (11) is connected to a gray pipe (12), and the outlet of the gray pipe (12) is bolted to a plug plate.

6. The acid incinerator flue gas M-pipe cooling system according to claim 5, characterized in that: The M-tube (9) and the connecting compartment (8) are provided with heat dissipation fins (10) for heat dissipation.

7. The acid incinerator flue gas M-pipe cooling system according to claim 2, characterized in that: The ash hopper (7) and the support box (11) are installed on the support platform, and the adjacent M pipes (9) are reinforced and fixed by connecting rods.

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