Integrated method for metallurgical flue gas dust collector inlet duct, bypass and manhole access

Abstract

An integrated method of gas inlet pipeline, bypass and manhole passage of metallurgical flue gas dust collector, comprising four processes: (1) when the metallurgical furnace or production line is just started, start the flue gas conveying equipment fan, close the cold air mixing valve and the inlet valve; open the bypass valve, the flue gas directly enters the clean gas collection chamber and is discharged from the clean gas outlet pipe into the desulfurization tower; (2) when normal production is put into, open the inlet valve, close the bypass valve, open the cold air mixing valve when the temperature is high, the flue gas enters the pulse dust collector for dust removal, the clean gas is collected in the clean gas collection chamber and is discharged from the clean gas outlet pipe into the desulfurization tower for treatment; (3) when the pressure of the metallurgical production line exceeds the rated pressure, the bypass valve is automatically opened as an emergency valve to release pressure, the flue gas is discharged into the clean gas collection chamber and is treated by the clean gas outlet pipe desulfurization tower; (4) when shutdown or shutdown for inspection and repair, close the cold air mixing valve and the inlet valve, open the bypass valve; the inspection personnel check the flue gas inlet pipeline, the cold air mixing valve, the inlet valve and the flue gas distribution chamber from the connecting flange, and make a repair and maintenance scheme. The present application has compact structure and multifunctional integration.

Description

Technical Field

[0001] This invention relates to industrial ventilation, environmental protection, metallurgical flue gas treatment equipment, and safety production management, specifically to an integrated method for the inlet pipe, bypass, and manhole passage of a metallurgical flue gas dust collector. Background Technology

[0002] The metallurgical industry, such as iron and steel metallurgy, non-ferrous metal metallurgy, and building materials, generates a large amount of pollutants during production processes. Environmental protection measures such as dust removal, purification, and waste gas recycling are required. Ventilation equipment and dust collectors are commonly used equipment.

[0003] In the metallurgical industry, when a metallurgical furnace or production line is first put into operation or resumes production, the process of drying the production line and heating it before feeding materials will generate a large amount of flue gas that is dust-free or does not require dust removal by a dust collector. In the past, this was directly discharged into the atmosphere, causing environmental pollution. The current practice is to build a special flue gas treatment system to treat it, which increases the investment in the treatment system.

[0004] Metallurgical industrial production lines are generally designed with emergency valves. When the pressure on the production line exceeds the rated pressure, the emergency valve will automatically open to release pressure in order to avoid safety accidents. The traditional practice is to connect the emergency valve to the exhaust chimney for venting, which can also cause environmental pollution accidents. If a special pressure relief flue gas treatment facility is built, a large amount of capital investment is required.

[0005] When a metallurgical production line is shut down or ceases production, it is necessary to maintain and repair machinery and equipment. Generally, the machinery and equipment require specially designed manholes and passageways as pedestrian access for inspection, maintenance, and repair.

[0006] The aforementioned metallurgical production line requires separate design and construction of bypass pipelines and flue gas treatment facilities for drying and heating. It also necessitates the construction of specialized emergency valves and pressure relief flue gas emission and treatment facilities, as well as dedicated manholes and passageways on the machinery. This results in a complex structure, cumbersome operation, high operating costs, and substantial investment, exhibiting significant drawbacks. Summary of the Invention

[0007] The purpose of this invention is to provide an integrated method for the air inlet pipe, bypass and manhole passage of a metallurgical flue gas dust collector. This method has obvious advantages: simple and compact structure, multiple functions integrated, convenient and practical operation, low operating cost, and investment savings.

[0008] This invention provides the following technical solution:

[0009] An integrated method for an inlet duct, bypass, and manhole passage of a metallurgical flue gas dust collector includes the following four processes:

[0010] (1) When a metallurgical furnace or production line is first put into operation or resumes production, the process of drying the production line and heating the production line before feeding will generate a large amount of flue gas that is dust-free or does not need to be removed by a dust collector. Start the flue gas conveying equipment fan, close the cold air valve and the inlet valve; open the bypass valve, and the flue gas will directly enter the clean gas collection chamber under the action of the conveying equipment fan and be discharged into the desulfurization tower from the clean gas outlet pipe; after the drying and heating meet the specified requirements, open the inlet valve, close the bypass valve, and enter the next stage of the production process.

[0011] (2) When putting into normal production, open the inlet valve and close the bypass valve. When the temperature is high, open the cooling air valve. The flue gas enters the pulse dust collector for dust removal. The clean gas is collected in the clean gas collection chamber and discharged into the desulfurization tower for treatment through the clean gas outlet pipe.

[0012] (3) When the pressure in the metallurgical production line exceeds the rated pressure, the bypass valve automatically opens as an emergency valve to relieve pressure, and the flue gas is discharged into the clean gas collection chamber and treated by the desulfurization tower through the clean gas outlet pipe.

[0013] (4) When shutting down or stopping production for inspection and maintenance, close the cooling air valve and the inlet valve, and open the bypass valve; maintenance personnel climb up the bypass and manhole access ladder to the top cover of the bypass and manhole access, open the top cover of the bypass and manhole access, and enter the bypass and manhole access through the inner ladder; check the flue gas inlet pipe, cooling air valve, inlet valve and flue gas distribution chamber from the connecting flange A, and make an inspection and maintenance plan; enter the clean gas conversion chamber and clean gas concentration chamber to inspect, inspect and maintain the internal facilities; maintenance personnel climb out of the bypass and manhole access through the inner ladder, close the top cover of the bypass and manhole access, and climb down the bypass and manhole access through the outer ladder to complete the inspection and maintenance process.

[0014] In step (4) above, opening the bypass and manhole cover: unscrew the bypass and manhole cover bolts; rotate the bypass and manhole cover, and the cover opening shaft rotates along the cover opening shaft seat to complete opening the bypass and manhole cover.

[0015] In step (4) above, closing the bypass and manhole cover: rotate the bypass and manhole cover, rotate the cover opening shaft along the cover opening shaft seat, tighten the screws, and close the bypass and manhole cover.

[0016] The overall equipment of the above-mentioned integrated method for the inlet duct, bypass and manhole passage of the metallurgical flue gas dust collector.

[0017] The system includes a flue gas inlet duct, a flue gas distribution chamber, a bypass and manhole passage, an external ladder and an internal ladder for the bypass and manhole passage, a top cover for the bypass and manhole passage, a clean gas conversion chamber, a clean gas concentration chamber, a pulse dust collector, and a bag filter chamber. The flue gas inlet duct is connected to the flue gas distribution chamber via an inlet valve. A cooling air mixing valve is installed at the left end of the flue gas inlet duct. The right end of the flue gas inlet duct is connected to the bypass and manhole passage via connecting flange A, a bypass valve, and connecting flange B. The bypass and manhole passage has an internal ladder and an external ladder. The top cover of the bypass and manhole passage is connected to the top of the bypass and manhole passage via connecting flange C. The pulse dust collector consists of a flue gas distribution chamber, a clean gas conversion chamber, a clean gas concentration chamber, and a bag filter chamber. The clean gas concentration chamber is equipped with a clean gas outlet pipe.

[0018] Furthermore, the flue gas inlet pipe, the cooling air valve, the inlet valve, the flue gas distribution chamber, the connecting flange A, the bypass valve, the connecting flange B, the bypass and manhole passage, the inner ladder, the top cover of the bypass and manhole passage, and the outer ladder of the bypass and manhole passage are integrated into a part of the pulse dust collector. The clean gas concentration chamber, a part of the pulse dust collector structure, serves as the bypass conveying channel, which is connected to the bypass and manhole passage at the front and to the clean gas outlet pipe and the desulfurization tower at the rear.

[0019] Furthermore, the bypass and manhole passage top cover is mounted on the side seat of the bypass and manhole passage via a cover opening pivot and a cover opening pivot seat.

[0020] Furthermore, the pulse dust collector is equipped with a lifting valve.

[0021] This invention has the following characteristics:

[0022] 1. The clean air collection chamber, part of the pulse dust collector structure, is used as a bypass conveying channel. It is connected to the bypass and manhole channels at the front and to the clean air outlet pipe and desulfurization tower at the rear. There is no need to design and construct special bypass pipelines and treatment facilities.

[0023] 2. The bypass and manhole passages serve as both bypass connection pipes and manhole passages. The inner ladder, the top cover of the bypass and manhole passages, and the outer ladder of the bypass and manhole passages are auxiliary components that complete this function.

[0024] 3. Opening the bypass valve can serve as an observation port, allowing you to view the interior of the flue gas inlet pipe, the cooling air mixing valve, the inlet valve, and the flue gas distribution chamber through the connecting flange A.

[0025] 4. The bypass valve acts as an emergency valve. When the pressure on the production line exceeds the rated pressure, it will automatically open through the control system and discharge the gas into the desulfurization tower for treatment. This will relieve the pressure on the production line system and prevent safety accidents. It will also allow the depressurized flue gas to enter the desulfurization tower for treatment and meet emission standards, thus avoiding environmental accidents caused by pressure relief.

[0026] 5. The flue gas inlet duct, cold air mixing valve, inlet valve, flue gas distribution chamber and connecting flange A, bypass valve, connecting flange B, bypass and manhole passage, inner ladder, bypass and manhole passage top cover, bypass and manhole passage outer ladder, connecting flange C, opening shaft, and opening shaft seat are integrated into one part of the pulse dust collector. It has a compact structure, strong practicality, and simple operation.

[0027] 6. The bypass and manhole passage serves as both a manhole and a ladder, acting as a manhole and access ladder for inspection, maintenance, and repair. It also acts as a passage connecting the flue gas inlet pipe and the clean gas outlet pipe. At the same time, the connecting flange A5 is the observation port for the flue gas inlet pipe's cooling air valve, inlet valve, and flue gas distribution chamber.

[0028] 7. The connection between the flue gas inlet pipe and the clean gas outlet pipe is through the clean gas central chamber, avoiding the need for a bypass pipe that would otherwise be added to connect the inlet and outlet pipes using long pipes and components. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 for Figure 1 Top view;

[0031] Figure 3 for Figure 1 The left view;

[0032] Figure 4 This is a schematic diagram of a partial structure of the bypass and manhole passage of the present invention;

[0033] Figure 5 for Figure 4 Top view (excluding top cover);

[0034] Figure 6 for Figure 4 The left view;

[0035] Figure 7 Schematic diagram of the bypass and manhole access cover structure;

[0036] Figure 8 for Figure 7 Top view.

[0037] The diagram shows the following markings: 1. Flue gas inlet duct; 2. Cooling air mixing valve; 3. Inlet valve; 4. Flue gas distribution chamber; 5. Connecting flange A; 6. Bypass valve; 7. Connecting flange B; 8. Bypass and manhole passage; 9. Inner ladder; 10. Bypass and manhole passage top cover; 11. Clean gas conversion chamber; 12. Clean gas concentration chamber; 13. Pulse dust collector; 14. Baghouse; 15. Lifting valve; 16. Bypass and manhole passage outer ladder; 17. Connecting flange C; 18. Opening shaft; 19. Opening shaft seat; 20. Clean gas outlet pipe. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0039] See Figure 1-8 An integrated method for an inlet duct, bypass, and manhole passage of a metallurgical flue gas dust collector includes the following four processes:

[0040] (1) When the metallurgical furnace or production line is first put into use or resumes production, the production line needs to be dried and heated before feeding. A large amount of flue gas without dust or without the need for dust removal will be generated. Start the flue gas conveying equipment fan, close the cold air valve 2 and the inlet valve 3; open the bypass valve 6, and the flue gas will directly enter the clean gas collection chamber 12 under the action of the conveying equipment fan and be discharged into the desulfurization tower from the clean gas outlet pipe 20; after the drying and heating meet the specified requirements, open the inlet valve 3, close the bypass valve 6, and enter the next stage of the production process.

[0041] (2) When put into normal production, open the inlet valve 3 and close the bypass valve 6. When the temperature is high, open the cold air mixing valve 2. The flue gas enters the pulse dust collector 13 for dust removal. The clean gas is collected in the clean gas collection chamber 12 and discharged into the desulfurization tower for treatment through the clean gas outlet pipe 20.

[0042] (3) When the pressure in the metallurgical production line exceeds the rated pressure, the bypass valve 6 automatically opens as an emergency valve to release pressure, and the flue gas is discharged into the clean gas collection chamber 12 and treated by the clean gas outlet pipe 20 desulfurization tower.

[0043] (4) When the machine is shut down or production is stopped for inspection and maintenance, close the cold air valve 2 and the air inlet valve 3, and open the bypass valve 6; maintenance personnel climb from the bypass and manhole passage outside the ladder 16 to the top cover 10 of the bypass and manhole passage, open the top cover 10 of the bypass and manhole passage, and the maintenance personnel enter the bypass and manhole passage 8 from the inner ladder 9.

[0044] Check the flue gas inlet pipe 1, cooling air valve 2, inlet valve 3, and flue gas distribution chamber 4 from the connecting flange A5, and formulate an inspection and maintenance plan; enter the clean gas conversion chamber 11 and clean gas concentration chamber 12 to inspect and maintain the internal facilities; maintenance personnel climb out of the bypass and manhole passage 8 via the inner ladder 9, close the top cover 10 of the bypass and manhole passage, and then climb down via the outer ladder 16 of the bypass and manhole passage to complete the inspection and maintenance process.

[0045] In step (4) above, the opening of the bypass and manhole passage top cover 10 is as follows: unscrew the bolts of the bypass and manhole passage top cover 10; rotate the bypass and manhole passage top cover 10, and the opening shaft 18 rotates along the opening shaft seat 19 to complete the opening of the bypass and manhole passage top cover 10.

[0046] In step (4) above, closing the bypass and manhole passage top cover 10: rotate the bypass and manhole passage top cover 10, the opening shaft 18 rotates along the opening shaft seat 19, tighten the screws, and close the bypass and manhole passage top cover 10.

[0047] See Figure 1-8 The equipment used in the integrated method of the above-mentioned metallurgical flue gas dust collector inlet duct, bypass and manhole passage includes a flue gas inlet duct 1, a flue gas distribution chamber 4, a bypass and manhole passage 8, an outer ladder 16 for the bypass and manhole passage, an inner ladder 9, a top cover 10 for the bypass and manhole passage, a clean gas conversion chamber 11, a clean gas concentration chamber 12, a pulse dust collector 13, and a bag filter chamber 14. The flue gas inlet duct 1 is connected to the flue gas distribution chamber 4 through an inlet valve 3, and a cold air mixing valve 2 is provided at the left end of the flue gas inlet duct 1. The right end of the flue gas inlet pipe 1 is connected to the bypass and manhole channel 8 via connecting flange A5, bypass valve 6, and connecting flange B7. The bypass and manhole channel 8 has an inner ladder 9 and an outer ladder 16. The top cover 10 of the bypass and manhole channel is connected to the top of the bypass and manhole channel 8 via connecting flange C17. The structure of the pulse dust collector 13 consists of a flue gas distribution chamber 4, a clean gas conversion chamber 11, a clean gas concentration chamber 12, and a bag filter chamber. The clean gas concentration chamber 12 is equipped with a clean gas outlet pipe 20.

[0048] The flue gas inlet pipe 1, the cold air mixing valve 2, the inlet valve 3, the flue gas distribution chamber 4, the connecting flange A5, the bypass valve 6, the connecting flange B7, the bypass and manhole passage 8, the inner ladder 9, the top cover of the bypass and manhole passage 10, and the outer ladder of the bypass and manhole passage 16 are integrated into a part of the pulse dust collector 13. The clean gas concentration chamber 12, a part of the structure of the pulse dust collector 13, serves as a bypass conveying channel, which is connected to the bypass and manhole passage 8 at the front and to the clean gas outlet pipe 20 and the desulfurization tower at the rear.

[0049] The bypass and manhole passage top cover 10 is mounted on the side seat of the bypass and manhole passage 8 via the opening shaft 18 and the opening shaft seat 19.

[0050] The pulse dust collector 13 is equipped with a lifting valve 15.

[0051] This invention has significant advantages: it integrates four or more functions, has a simple and compact structure, is easy and practical to operate, has low operating costs, and saves investment.

[0052] The undescribed parts of this invention are the same as or implemented using existing technology.

Claims

1. A method for integrating the inlet duct, bypass, and manhole passage of a metallurgical flue gas dust collector, characterized in that: It includes the following four processes: A. When a metallurgical furnace or production line is first put into operation or resumes production, the production line needs to be dried and heated before feeding. This process will generate a large amount of flue gas that is dust-free or does not need to be removed by a dust collector. Start the flue gas conveying equipment fan, close the cold air valve (2) and the air inlet valve (3); open the bypass valve (6), and the flue gas will directly enter the clean gas collection chamber (12) under the action of the conveying equipment fan and be discharged into the desulfurization tower from the clean gas outlet pipe (20). After the drying and heating meet the specified requirements, open the air inlet valve (3), close the bypass valve (6), and enter the next stage of the production process. B. When putting into normal production, open the inlet valve (3) and close the bypass valve (6). When the temperature is high, open the cooling air valve (2). The flue gas enters the pulse dust collector (13) for dust removal. The clean gas is collected in the clean gas collection chamber (12) and discharged into the desulfurization tower for treatment through the clean gas outlet pipe (20). C. When the pressure in the metallurgical production line exceeds the rated pressure, the bypass valve (6) automatically opens as an emergency valve to release pressure, and the flue gas is discharged into the clean gas collection chamber (12) and treated by the clean gas outlet pipe (20) in the desulfurization tower. D. When shutting down or stopping production for inspection and maintenance, close the cooling air valve (2) and the air inlet valve (3), and open the bypass valve (6); maintenance personnel climb from the external ladder (16) of the bypass and manhole passage to the top cover (10) of the bypass and manhole passage, open the top cover (10) of the bypass and manhole passage, and enter the bypass and manhole passage (8) from the internal ladder (9); check the condition of the flue gas inlet pipe (1), cooling air valve (2), air inlet valve (3) and flue gas distribution chamber (4) from the connecting flange A (5), and make an inspection and maintenance plan; enter the clean gas conversion chamber (11) and clean gas concentration chamber (12) to inspect and maintain the internal facilities; maintenance personnel climb out of the bypass and manhole passage (8) from the internal ladder (9), close the top cover (10) of the bypass and manhole passage, and climb down from the external ladder (16) of the bypass and manhole passage to complete the inspection and maintenance process.

2. The integration method of the inlet pipe, bypass, and manhole passage of the metallurgical flue gas dust collector as described in claim 1, characterized in that: In process D, the bypass and manhole access cover (10) is opened by unscrewing the bolts of the bypass and manhole access cover (10); rotating the bypass and manhole access cover (10), the opening shaft (18) rotates along the opening shaft seat (19) to complete the opening of the bypass and manhole access cover (10).

3. The integration method of the inlet pipe, bypass, and manhole passage of the metallurgical flue gas dust collector as described in claim 1, characterized in that: In process D, closing the bypass and manhole cover (10): rotate the bypass and manhole cover (10), the cover opening shaft (18) rotates along the cover opening shaft seat (19), tighten the screws, and close the bypass and manhole cover (10).

4. The equipment used in the integration method of the inlet pipe, bypass, and manhole passage of the metallurgical flue gas dust collector as described in claim 1, characterized in that: The system includes a flue gas inlet duct (1), a flue gas distribution chamber (4), a bypass and manhole passage (8), an external manhole ladder (16) and an internal manhole ladder (9), a top cover for the bypass and manhole passage (10), a clean gas conversion chamber (11), a clean gas concentration chamber (12), a pulse dust collector (13), and a bag filter chamber (14). The flue gas inlet duct (1) is connected to the flue gas distribution chamber (4) via an inlet valve (3). A cooling air valve (2) is provided at the left end of the flue gas inlet duct (1), and the right end of the flue gas inlet duct (1) is connected via a flange. A(5), bypass valve(6), connecting flange B(7) are connected to bypass and manhole channel(8). The bypass and manhole channel(8) has an inner ladder (9) and an outer ladder (16). The top cover (10) of the bypass and manhole channel(8) is connected to the top of the bypass and manhole channel(8) through connecting flange C(17). The structure of the pulse dust collector(13) consists of flue gas distribution chamber(4), clean gas conversion chamber(11), clean gas concentration chamber(12) and bag chamber. The clean gas concentration chamber(12) is equipped with a clean gas outlet pipe (20).

5. The equipment used in the integration method of the inlet pipe, bypass, and manhole passage of the metallurgical flue gas dust collector as described in claim 4, characterized in that: The flue gas inlet pipe (1), the cold air mixing valve (2), the inlet valve (3), the flue gas distribution chamber (4), the connecting flange A (5), the bypass valve (6), the connecting flange B (7), the bypass and manhole passage (8), the inner ladder (9), the bypass and manhole passage top cover (10), and the bypass and manhole passage outer ladder (16) are integrated into a part of the pulse dust collector (13). The clean gas concentration chamber (12), a part of the structure of the pulse dust collector (13), serves as the bypass conveying channel, which is connected to the bypass and manhole passage (8) in the front and to the clean gas outlet pipe (20) and the desulfurization tower in the back.

6. The equipment used in the integration method of the inlet pipe, bypass, and manhole passage of the metallurgical flue gas dust collector as described in claim 4, characterized in that: The bypass and manhole cover (10) is mounted on the side seat of the bypass and manhole (8) via the cover opening pivot (18) and the cover opening pivot seat (19).

7. The equipment used in the integration method of the inlet pipe, bypass, and manhole passage of the metallurgical flue gas dust collector as described in claim 4, characterized in that: The pulse dust collector (13) is equipped with a lift valve (15).

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