A waste heat recovery device for natural gas forge heating furnace flue gas treatment

Abstract

The utility model relates to heating furnace technical field, concretely relates to a natural gas forging heating furnace flue gas treatment is with waste heat recovery device, include: heat exchange subassembly, it is equipped with the jar body with the smoke pipe, at least two parallel flue gas filter components, the filter component includes the casing and the filter board that will chamber divide into the dirty chamber and the pure chamber in the casing. The utility model discloses by making high temperature flue gas through the smoke control pipeline and choosing one and leading into certain filter component dirty chamber, after passing through the filter board, by the smoke outlet into the heat exchange subassembly, when the filter board ash accumulation causes the pressure difference to rise, switches the filter path, makes the smoke control pipeline switch to another filter component, realizes double -channel zero downtime switching, and triggers the self backflush, by the backflush control pipeline and guides the original component back smoke port, makes the clean flue gas that new filter component discharges reversely penetrate the original filter board, leads into the smoke pipe through the back smoke port of the original filter component, utilizes the system self -produced clean flue gas and cleans the ash, zero external cost backflush, energy -conserving.

Description

Technical Field

[0001] This utility model relates to the field of heating furnace technology, and in particular to a waste heat recovery device for treating flue gas from a natural gas forging heating furnace. Background Technology

[0002] Natural gas forging furnaces generate a large amount of high-temperature flue gas during high-temperature operation, and the waste heat contained in this gas accounts for approximately 20%-35% of the furnace's total energy consumption. Efficiently recovering this waste heat from the flue gas is a key way to improve energy utilization and reduce carbon emissions. The current mainstream solution adopts a combination of "heat exchanger + filtration device", in which the filtration stage is used to remove particulate matter such as iron oxide filings and carbon deposits from the flue gas and prevent blockage of the heat exchange pipeline.

[0003] Traditional waste heat recovery devices use single-channel filtration, which is prone to operation and maintenance interruptions. For example, when using a single filtration unit, the filter plates need to be cleaned regularly due to the accumulation of smoke and dust. The forging furnace needs to be cleaned every 48 hours on average, with each shutdown lasting 2-3 hours. This results in the waste heat recovery system having an effective operating rate of less than 90%. In addition, there are defects in backflushing cleaning technology, and existing backflushing solutions mostly rely on external media (such as compressed air or high-pressure water).

[0004] Therefore, there is an urgent need to develop a waste heat recovery device with dual-channel parallel filtration and self-circulating backflushing capabilities to achieve continuous operation, zero external backflushing, and full recovery of waste heat. Utility Model Content

[0005] In view of this, the purpose of this utility model is to propose a waste heat recovery device for treating flue gas from a natural gas forging heating furnace, so as to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, this utility model provides a waste heat recovery device for treating flue gas from a natural gas forging heating furnace, comprising:

[0007] A heat exchange assembly having a tank with an inlet flue;

[0008] At least two parallel flue gas filtration assemblies, each filtration assembly including a housing and a filter plate inside the housing that divides a chamber into a dirty chamber and a clean chamber, the housing having a flue gas inlet communicating with the dirty chamber, a flue gas return outlet communicating with the clean chamber;

[0009] The flue gas control pipeline is used to selectively connect the flue gas outlet of the heating furnace to the flue gas inlet of any filter component;

[0010] Smoke control piping, which is used to selectively connect the smoke outlet of any filter component to the smoke inlet pipe or the smoke outlet of other filter components;

[0011] The backflushing control line is used to selectively connect the return port of any filter component to the inlet pipe. When the backflushing control line is connected to the return port of the target filter component, the clean flue gas discharged from the exhaust ports of the other filter components flows in reverse through the filter plate of the target filter component and is introduced into the inlet pipe through its return port to achieve backflushing.

[0012] As a preferred embodiment of this utility model, the smoke inlet control pipeline includes:

[0013] The first connecting pipe has multiple parts and one end is connected to the smoke inlet;

[0014] The first valve has multiple first ports, each of which is connected to the other end of a first connecting pipe, and one of the first ports is connected to the flue gas outlet of the heating furnace.

[0015] As a preferred embodiment of this utility model, the smoke exhaust control pipeline includes:

[0016] The second connecting pipe has multiple parts and one end is connected to the exhaust port;

[0017] The second valve has multiple second ports, each of which is connected to the other end of the second connecting pipe;

[0018] The third connecting pipe has one end connected to one of the second ports of the second valve, and the other end connected to the smoke inlet pipe.

[0019] As a preferred embodiment of this utility model, the backflush control pipeline includes:

[0020] The fourth connecting pipe has multiple parts and one end is connected to the smoke return port;

[0021] The third valve has multiple third ports, each of which is connected to the other end of the fourth connecting pipe;

[0022] The fifth connecting pipe has one end connected to one of the third ports of the third valve, and the other end connected to the third connecting pipe.

[0023] As a preferred embodiment of this invention, the filtering component further includes:

[0024] A servo motor, which is connected to the housing;

[0025] A rotating shaft is rotatably disposed within the housing, and the rotating shaft is connected to the output shaft of the servo motor.

[0026] The scraper has one end fixedly connected to the rotating shaft and the other end in contact with the working surface of the filter plate.

[0027] As a preferred technical solution of this utility model, the filter assembly further includes a dust collection box with a port on one side, the outer surface of the port is provided with an external thread, and the bottom of the housing is open and the inner wall of the opening is provided with an internal thread that matches the external thread.

[0028] As a preferred embodiment of this utility model, a funnel is provided inside the shell and below the filter plate. The funnel is located above the ash storage box and has a structure that is wider at the top and narrower at the bottom.

[0029] As a preferred embodiment of this invention, the heat exchange assembly further includes:

[0030] Two end plates are disposed opposite each other inside the tank body, and the end plates are spaced apart from the inner walls of both ends of the tank body to form airflow chambers;

[0031] The heating tube has multiple heating tubes disposed between two end plates. The two ends of the heating tube are respectively connected to the airflow chambers on both sides. The outer surface of the heating tube, the opposite sides of the end plates, and the inner wall of the tank together form a heating chamber.

[0032] A cold water inlet pipe is located at the upper end of the tank and connected to the heating chamber;

[0033] A hot water drain pipe is located at the lower end of the tank and connected to the heating chamber.

[0034] The beneficial effects of this utility model are as follows: This utility model allows high-temperature flue gas to be selectively introduced into the sludge chamber of a filter component through the flue gas inlet control pipeline. After passing through the filter plate, the gas enters the heat exchange component through the exhaust port. When the pressure difference increases due to ash accumulation on the filter plate, the filtration path is switched, and the flue gas inlet / exhaust control pipeline is switched to another filter component. This achieves dual-channel zero-downtime switching and triggers self-backflushing. The backflushing control pipeline connects the original component's return port, allowing the clean flue gas discharged from the new filter component to penetrate the original filter plate in reverse and enter the flue gas inlet pipe through the original filter component's return port. The system uses its own generated clean flue gas for ash removal, achieving zero external backflushing and energy saving. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in 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 for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the external three-dimensional structure of the present invention;

[0037] Figure 2 This is a schematic diagram of the internal three-dimensional structure of the present invention;

[0038] Figure 3 This is a schematic diagram of the internal three-dimensional structure of the shell of this utility model.

[0039] The following are labeled in the diagram: 1. Tank body; 2. Smoke inlet pipe; 3. Smoke outlet pipe; 4. End plate; 5. Heating pipe; 6. Cold water inlet pipe; 7. Hot water outlet pipe; 8. Shell; 9. Smoke inlet; 10. Edge plate; 11. Filter plate; 12. Smoke outlet; 13. Servo motor; 14. Rotating shaft; 15. Scraper; 16. Ash storage box; 17. Port; 18. Funnel; 19. First connecting pipe; 20. First valve; 21. Second connecting pipe; 22. Second valve; 23. Smoke return port; 24. Fourth connecting pipe; 25. Third valve; 26. Third connecting pipe; 27. Fifth connecting pipe. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0041] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] like Figure 1 and Figure 2As shown, a waste heat recovery device for treating flue gas from a natural gas forging furnace includes: a heat exchange assembly with a tank 1 having an inlet pipe 2; at least two parallel flue gas filtration assemblies, each filtration assembly including a shell 8 and a filter plate 11 within the shell 8 that divides a chamber into a polluted chamber and a clean chamber, the upper and lower ends of the filter plate 11 being fixed to the inner wall of the shell 8 by edge plates 10; the shell 8 having an inlet 9 communicating with the polluted chamber, an outlet 23 communicating with the clean chamber, and an outlet 12 communicating with the clean chamber; and an inlet control pipeline for selecting the flue gas outlet of the heating furnace. A smoke inlet 9 connected to any filter assembly; a smoke exhaust control line for selectively connecting the smoke exhaust 12 of any filter assembly to the smoke inlet pipe 2 or the smoke exhaust 12 of other filter assemblies; a backflushing control line for selectively connecting the return smoke inlet 23 of any filter assembly to the smoke inlet pipe 2. When the backflushing control line is connected to the return smoke inlet 23 of the target filter assembly, the clean smoke exhaust from the smoke exhaust 12 of the other filter assemblies flows in reverse through the filter plate 11 of the target filter assembly and is introduced into the smoke inlet pipe 2 through its return smoke inlet 23 to achieve backflushing.

[0043] The above technical solution can ensure that the device can operate continuously. When in use, the high-temperature flue gas is selectively introduced into the dirty chamber of a certain filter component through the flue gas inlet control pipeline. After being filtered by the filter plate 11, it enters the heat exchange component from the flue gas outlet 12.

[0044] When the filter plate 11 of the filter assembly is occupied by dirt due to surface pores, causing an increase in pressure, the flue gas outlet of the heating furnace is connected to the flue gas inlet 9 of the new filter assembly through the flue gas inlet control pipeline. The flue gas exhaust control pipeline connects the flue gas outlet 12 of the new filter assembly to the flue gas outlet 12 of the original filter assembly. At the same time, the backflushing control pipeline opens the return flue gas outlet 23 of the original filter assembly, so that the return flue gas outlet 23 of the original filter assembly is connected to the flue gas inlet pipe 2. This allows the clean flue gas discharged from the new filter assembly to enter from the flue gas outlet 12 of the original filter assembly and penetrate the filter plate 11 of the original filter assembly in the reverse direction to achieve backflushing and dust removal, thereby realizing the parallel switching of dual channels and self-circulation backflushing.

[0045] In summary, this utility model allows high-temperature flue gas to be selectively introduced into the sludge chamber of a filter component via the inlet control pipeline. After passing through the filter plate 11, the gas enters the heat exchange component through the exhaust port 12. When the pressure difference increases due to ash accumulation on the filter plate 11, the filtration path is switched, allowing the inlet / exhaust control pipeline to switch to another filter component. This achieves dual-channel zero-downtime switching and triggers self-backflushing. The backflushing control pipeline connects the original component's return port 23, allowing the clean flue gas discharged from the new filter component to penetrate the original filter plate 11 in reverse and enter the inlet pipe 2 through the original filter component's return port 23. The system utilizes its own generated clean flue gas for ash removal, achieving zero external backflushing and energy saving.

[0046] like Figure 1 and Figure 2As shown, in this embodiment, the smoke inlet control pipeline includes: a first connecting pipe 19, which has multiple first interfaces and one end is connected to the smoke inlet 9; a first valve 20, which has multiple first interfaces, each of which is connected to the other end of the first connecting pipe 19, and one of the first interfaces is connected to the smoke outlet of the heating furnace.

[0047] The above technical solution can accurately allocate the flue gas path and operate the first valve 20 to switch the passage, so that the flue gas from the heating furnace enters the flue gas inlet 9 of the target filter component through the first connecting pipe 19. In this embodiment, two filter components are used, so the first valve 20 can be a three-way valve or a multi-way solenoid valve.

[0048] like Figure 1 and Figure 2 As shown, in this embodiment, the smoke exhaust control pipeline includes: a second connecting pipe 21, which has multiple second interfaces and one end is connected to the smoke exhaust port 12; a second valve 22, which has multiple second interfaces, each of which is connected to the other end of the second connecting pipe 21; and a third connecting pipe 26, one end of which is connected to one of the second interfaces of the second valve 22, and the other end of which is connected to the smoke inlet pipe 2.

[0049] The above technical solution allows the exhaust port 12 of any filter component to be connected to the inlet pipe 2, or the exhaust port 12 of any filter component to be connected to the exhaust port 12 of the filter component that needs backflushing, so as to achieve backflushing.

[0050] like Figure 1 and Figure 2 As shown, in this embodiment, the backflush control pipeline includes: a fourth connecting pipe 24, which has multiple third interfaces and one end is connected to the return smoke port 23; a third valve 25, which has multiple third interfaces, each of which is connected to the other end of the fourth connecting pipe 24; and a fifth connecting pipe 27, one end of which is connected to one of the third interfaces of the third valve 25, and the other end of which is connected to the third connecting pipe 26.

[0051] The above technical solution can achieve zero external consumption online dust removal. When the third valve 25 opens the return smoke port 23 of the target filter component, the clean flue gas of the switched filter component is injected into the exhaust port 12 of the filter component in reverse through the second connecting pipe 21. After passing through the filter plate 11 in reverse, it is discharged from the return smoke port 23 to the inlet pipe 2, thereby cleaning the filter plate 11 of the current filter component.

[0052] like Figure 2 and Figure 3 As shown, in this embodiment, the filter assembly further includes: a servo motor 13, which is connected to the housing 8; a rotating shaft 14, which is rotatably disposed in the housing 8, and the rotating shaft 14 is connected to the output shaft of the servo motor 13; and a scraper 15, one end of which is fixedly connected to the rotating shaft 14, and the other end of which is in contact with the working surface of the filter plate 11.

[0053] The above technical solution can actively clean the filter plate 11. When in use, the servo motor 13 is started to drive the rotating shaft 14 to rotate. The rotating shaft 14 drives the scraper 15 to rotate. The scraper 15 slides against the working surface of the filter plate 11, thereby scraping off the dirt attached to the working surface of the filter plate 11.

[0054] like Figure 2 and Figure 3 As shown, in this embodiment, the filter assembly also includes a dust collection box 16 with a port 17 on one side. The outer surface of the port 17 is provided with an external thread, and the bottom of the housing 8 is open and the inner wall of the opening is provided with an internal thread that matches the external thread.

[0055] The above technical solution can collect the falling ash and slag. When the dirt is scraped off by the scraper 15 and falls into the ash storage box 16 in the form of ash and slag, when the ash storage box 16 is full, the external thread at the port 17 of the ash storage box 16 can be disengaged from the internal thread at the bottom opening of the housing 8 by rotating the ash storage box 16.

[0056] like Figure 2 and Figure 3 As shown, in this embodiment, a funnel 18 is provided inside the housing 8 and below the filter plate 11. The funnel 18 is located above the ash storage box 16 and has a structure that is wider at the top and narrower at the bottom.

[0057] The above technical solution can guide the ash and slag into the ash storage box 16, so that the ash and slag can be gathered and guided into the ash storage box 16.

[0058] like Figure 1 and Figure 2 As shown, in this embodiment, the heat exchange assembly further includes: two end plates 4, which are disposed opposite to each other inside the tank 1, with the end plates 4 spaced apart from the inner walls of both ends of the tank 1 to form an airflow chamber; multiple heating pipes 5, which are disposed between two end plates 4, with both ends of the heating pipes 5 respectively connected to the airflow chambers on both sides, and the outer surface of the heating pipes 5, the opposite sides of the end plates 4, and the inner wall of the tank 1 together forming a heating chamber; a cold water inlet pipe 6, which is located at the upper end of the tank 1 and connected to the heating chamber; and a hot water drain pipe 7, which is located at the lower end of the tank 1 and connected to the heating chamber.

[0059] The above technical solution can heat cold water and realize waste heat utilization. Clean flue gas enters the airflow chamber from the flue gas inlet pipe 2, flows through the inner wall of the heating pipe 5 and releases heat, and is discharged from the flue gas outlet pipe 3 on the right side of the tank body 1. Cold water is injected into the heating chamber from the cold water inlet pipe 6 and absorbs heat around the heating pipe 5. Hot water is output from the hot water drain pipe 7.

[0060] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0061] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A waste heat recovery device for natural gas forge heating furnace flue gas treatment, characterized by, The device includes: A heat exchange assembly having a tank (1) with a flue gas inlet pipe (2); At least two parallel flue gas filtration assemblies, the filtration assembly including a housing (8) and a filter plate (11) inside the housing (8) that divides the chamber into a dirty chamber and a clean chamber, the housing (8) having a smoke inlet (9) communicating with the dirty chamber, a smoke return outlet (23) communicating with the clean chamber and a smoke exhaust outlet (12). The flue gas control pipeline is used to connect one of the flue gas outlets of the heating furnace to the flue gas inlet of any filter component (9). Smoke control piping, which is used to selectively connect the smoke outlet (12) of any filter component to the smoke inlet pipe (2) or the smoke outlet (12) of other filter components. The backflush control line is used to selectively connect the return port (23) of any filter component to the inlet pipe (2). When the backflush control line is connected to the return port (23) of the target filter component, the clean flue gas discharged from the exhaust port (12) of the other filter components flows in reverse through the filter plate (11) of the target filter component and is introduced into the inlet pipe (2) through its return port (23) to achieve backflush.

2. The waste heat recovery device for natural gas forge heating furnace flue gas treatment according to claim 1, characterized by, The smoke inlet control pipeline includes: The first connecting pipe (19) has multiple pipes and one end is connected to the smoke inlet (9); The first valve (20) has a plurality of first ports, each of which is connected to the other end of the first connecting pipe (19), and one of the first ports is connected to the flue gas outlet of the heating furnace.

3. The waste heat recovery device for natural gas forge heating furnace flue gas treatment according to claim 2, characterized by, The smoke exhaust control pipeline includes: The second connecting pipe (21) has multiple pipes and one end is connected to the exhaust port (12); The second valve (22) has multiple second ports, each of which is connected to the other end of the second connecting pipe (21); The third connecting pipe (26) has one end connected to one of the second interfaces of the second valve (22) and the other end connected to the smoke inlet pipe (2).

4. The waste heat recovery device for natural gas forge heating furnace flue gas treatment according to claim 3, characterized by, The backflush control line includes: The fourth connecting pipe (24) has multiple pipes and one end is connected to the smoke return port (23); The third valve (25) has multiple third ports, each of which is connected to the other end of the fourth connecting pipe (24); The fifth connecting pipe (27) has one end connected to one of the third interfaces of the third valve (25) and the other end connected to the third connecting pipe (26).

5. The waste heat recovery device for natural gas forge heating furnace flue gas treatment according to claim 1, characterized in that, The filtering component also includes: A servo motor (13) is connected to the housing (8); A rotating shaft (14) is rotatably disposed in the housing (8), and the rotating shaft (14) is connected to the output shaft of the servo motor (13) via a transmission connection. The scraper (15) is fixedly connected at one end to the rotating shaft (14) and at the other end is in contact with the working surface of the filter plate (11).

6. The waste heat recovery device for natural gas forge heating furnace flue gas treatment according to claim 5, characterized by, The filter assembly also includes a dust collection box (16) with a port (17) on one side. The outer surface of the port (17) is provided with an external thread, and the bottom of the housing (8) is open and the inner wall of the opening is provided with an internal thread that matches the external thread.

7. The waste heat recovery device for natural gas forge heating furnace flue gas treatment according to claim 6, characterized by, A funnel (18) is provided inside the housing (8) and below the filter plate (11). The funnel (18) is located above the ash storage box (16) and has a structure that is wider at the top and narrower at the bottom.

8. The waste heat recovery device for treating flue gas from a natural gas forging heating furnace according to claim 1, characterized in that, The heat exchange assembly also includes: Two end plates (4) are arranged opposite each other inside the tank body (1), and the end plates (4) are spaced apart from the inner walls of both ends of the tank body (1) to form airflow chambers; Heating tube (5) has multiple heating tubes and is disposed between two end plates (4). The two ends of the heating tube (5) are respectively connected to the airflow chambers on both sides. The outer surface of the heating tube (5), the opposite sides of the end plates (4) and the inner wall of the tank (1) together form a heating chamber. A cold water inlet pipe (6) is located at the upper end of the tank (1) and connected to the heating chamber; A hot water drain pipe (7) is located at the lower end of the tank (1) and connected to the heating chamber.

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