Blast furnace gas cloth bag online switching box body device and cloth bag box body online switching method

Abstract

The invention relates to a blast furnace gas cloth bag on-line switching box body device and a cloth bag box body on-line switching method, the device comprises a pipeline, an electric butterfly valve, an electro-hydraulic gas locking device and a blind plate valve, the blind plate valve is connected with the electro-hydraulic gas locking device through a pipeline, the electro-hydraulic gas locking device is connected with the electric butterfly valve through a pipeline, and the electric butterfly valve is connected with the electric butterfly valve through a pipeline. The electro-hydraulic air locking device is located between the blind plate valve and the electric butterfly valve. And the blind plate valve is connected with the air inlet end / air outlet end of the cloth bag box body through a pipeline. The device and the method can be popularized and applied to on-line switching application of large, medium and small blast furnace gas cloth bag boxes in the same industry, blast furnace air reduction cooperation is not needed in the process that the blast furnace gas cloth bags exit from production and are put into operation on line, the influence on blast furnace production is eradicated, valve opening and closing are remotely controlled, no gas leakage exists in the whole process, and the production efficiency is improved. Operation is safe and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of blast furnace gas treatment, and more particularly to a blast furnace gas bag online switching box device and a bag box online switching method. Background Art

[0002] The blast furnace gas baghouse is a core component of a dry dust removal system. Its structural design and functional implementation directly impact dust removal efficiency and operational stability. The raw gas from the blast furnace gas dry dust removal process undergoes initial treatment in a gravity dust collector. The baghouse then processes the clean gas before it enters the TRT, pressure regulating valve block, and other blast furnace top pressure control equipment.

[0003] The number of baghouses is determined by the hourly raw gas production of the blast furnace and the processing capacity of each baghouse. The blast furnace process dictates that as long as production continues, a continuous flow of raw gas enters the baghouses for dust removal. However, bags are consumable parts, and in daily production, individual baghouses may need to be taken out of service and repaired before being put back into production. To avoid delays in production, the baghouses must have an online production switching function, meaning that the pipelines at the baghouse inlet and outlet must be effectively disconnected.

[0004] Currently, some blast furnace bag-type boxes have electric butterfly valves installed on their inlet and outlet gas pipes. However, this configuration presents a serious problem: during the high-voltage online opening and closing of the bag-type boxes, due to the characteristics of butterfly valves, the valves have a high leakage rate when closed. Gas leaks may occur during the operation of tightening the blind plate valves, closing or opening the blind plate valves. The high-pressure, dusty gas flow can impact and injure workers, causing widespread gas leaks and gas poisoning to nearby personnel. In addition, the dust-laden gas can drift widely, easily causing safety and environmental incidents.

[0005] To remove a baghouse from overhaul and return it to production after overhaul, the blast furnace typically requires a significant reduction in airflow and pressure from 300-400 kPa to 20-30 kPa. However, this still results in significant gas and dust overflow, which can easily cause valve seals to blow off and become detached. This also increases the risk of gas poisoning accidents for maintenance personnel and operators who are constantly exposed to gas. Therefore, to enable online switching of blast furnace gas baghouses, safe and effective shutoff measures must be implemented, along with one-touch control for removing and placing the baghouse in operation. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a blast furnace gas bag online switching box device and a bag box online switching method, which can be promoted and used in the online switching application of blast furnace gas bag boxes of large, medium and small blast furnaces in the same industry. During the online withdrawal of blast furnace gas bag from production and online commissioning, there is no need to reduce the blast furnace air flow, thereby eliminating the impact on blast furnace production, and the valve switch can be remotely controlled. There is no gas leakage in the whole process, and the operation is safe and reliable.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: A blast furnace gas bag online switching box device includes a pipeline, an electric butterfly valve, an electro-hydraulic air locking device and a blind plate valve. The blind plate valve and the electro-hydraulic air locking device are connected by a pipeline, and the electro-hydraulic air locking device and the electric butterfly valve are connected by a pipeline. The electro-hydraulic air locking device is located between the blind plate valve and the electric butterfly valve; the blind plate valve is connected to the air inlet / outlet end of the bag box through a pipeline.

[0008] In one embodiment, the blind flange valve is an open sector-shaped blind flange valve.

[0009] In one embodiment, a manual latch is provided on the top end of the push rod of the open sector blind plate valve.

[0010] In one embodiment, the blast furnace gas bag online switching box device also includes a relief valve, which is arranged between the blind plate valve and the electro-hydraulic air locking device. The relief valve is connected to the blind plate valve through a pipeline, and the relief valve is connected to the electro-hydraulic air locking device through a pipeline.

[0011] A method for online switching of bag boxes is as follows: S1, bag box exits the production line online; S11. The electric butterfly valve at the raw gas inlet end of the bag box is closed. After the electric butterfly valve is fully closed, the electro-hydraulic air lock device at the raw gas inlet end of the bag box is closed. S12. After the electric butterfly valve and the electro-hydraulic air lock device at the raw gas inlet end of the bag box are fully closed, the electric butterfly valve and the electro-hydraulic air lock device at the gas outlet end of the bag box are closed; S13. After the electric butterfly valves and electro-hydraulic air lock devices at the air inlet and outlet ends of the bag box are fully closed, the relief valve is opened. After the pressure inside the bag box reaches the standard, the blind plate valves at the air inlet and outlet ends of the bag box are closed, and the bag box completes the operation of exiting the production line online. S2. After the bag box is purged of residual gas with nitrogen and replaced with compressed air, open the bag box manhole to replace or overhaul the bags; S3. After completing the bag replacement or maintenance, close the bag box manhole and put the bag box back into the production line: S31, the blind valves at the air inlet and outlet ends of the bag box are opened, and the relief valve is closed; S32. After the relief valve is fully closed, the electro-hydraulic air lock device at the air inlet end of the bag box is opened; S33, after the electro-hydraulic air lock device at the air inlet end of the bag box is fully opened, the electric butterfly valve opens and the raw gas enters the bag box; S34. After the pressure in the bag box reaches the standard, the electric butterfly valve at the air outlet of the bag box is opened first, and then the electro-hydraulic air locking device is opened, and the bag box is put into use on the production line.

[0012] In one embodiment, in step S1, the valve closing signal is set to be delayed for 5 seconds.

[0013] In one embodiment, in step S13, the relief valve is relieved for 10-20 seconds.

[0014] In one embodiment, in step S13, when the pressure in the bag-forming box is ≤3 kPa, the blind plate valves at the air inlet and air outlet of the bag-forming box are closed.

[0015] In one embodiment, in step S3, the valve closing position signal is set to be delayed for 5 seconds, and the valve opening position signal is set to be delayed for 5 seconds.

[0016] In one of the embodiments, in step S33, after the pressure inside the bag box is ≦0.01 kPa, the electric butterfly valve at the air outlet end of the bag box is opened first, and after the valve opening signal is delayed for 5 seconds, the electro-hydraulic air locking device is opened, and the bag box is put into use on the production line.

[0017] In summary, the present invention has the following beneficial effects: The present invention installs an electro-hydraulic air locking device between the electric butterfly valve and the blind plate valve. An electro-hydraulic air locking device with a zero leakage rate is added behind the electric butterfly valve with a higher leakage rate, ensuring that the open fan-shaped blind plate valves at the air inlet and outlet ends of the bag box have no gas leakage during the opening and closing process.

[0018] The bag box of the present invention adopts a "one-button" control program for online exit from production and online commissioning of production. Remote unmanned operation is adopted in the process where there may be gas leakage. It does not affect the normal production of the blast furnace and does not require air reduction and pressure reduction, while ensuring the safety of gas area operations.

[0019] The present invention can be promoted and used in the online switching application of blast furnace gas bag boxes of large, medium and small blast furnaces in the same industry. During the online withdrawal of the blast furnace gas bag from production and online commissioning, there is no need to cooperate with blast furnace wind reduction, eliminating the impact on blast furnace production, and remotely controlling the valve switch. There is no gas leakage in the whole process, and the operation is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the blast furnace gas bag online switching box device of the present invention.

[0021] In the figure: 1. Blind plate valve, 2. Electro-hydraulic air locking device, 3. Electric butterfly valve, 4. Release valve, 5. Pipeline, 6. Bag box. DETAILED DESCRIPTION

[0022] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0023] It is worth noting that the directional words such as "upper" and "lower" involved in this article are all relative to the perspective of the drawings. They are only for the convenience of description and cannot be understood as limitations on the technical solution.

[0024] like Figure 1 As shown, the present invention proposes a blast furnace gas bag online switching box device, including a pipeline 5, an electric butterfly valve 3, an electro-hydraulic air locking device 2 and a blind plate valve 1. The blind plate valve 1 and the electro-hydraulic air locking device 2 are connected through the pipeline 5, and the electro-hydraulic air locking device 2 and the electric butterfly valve 3 are connected through the pipeline 5. The electro-hydraulic air locking device 2 is located between the blind plate valve 1 and the electric butterfly valve 3; the blind plate valve 1 is connected to the air inlet / outlet end of the bag box 6 through the pipeline 5.

[0025] For one bag box 6, there are two blast furnace gas bag online switching box devices, which are respectively arranged at the air inlet and air outlet ends of the bag box 6. Figure 1 As shown, the air inlet and outlet of the bag-type box 6 are respectively connected to the blind plate valve 1 via a pipe 5. An electro-hydraulic air lock device 2 is provided outside the blind plate valve 1, and an electric butterfly valve 3 is provided outside the electro-hydraulic air lock device 2. Taking the air inlet of the bag-type box 6 as an example, when the bag-type box 6 needs to be withdrawn online, the electric butterfly valve 3 and the electro-hydraulic air lock device 2 at the air inlet are closed, effectively isolating the raw gas. The electro-hydraulic air lock device 2 has an extremely low leakage rate, which can solve the problem of the high leakage rate of the electric butterfly valve 3. Only then is the blind plate valve 1 closed, avoiding gas leakage during the opening and closing process of the blind plate valve 1 caused by leakage of the electric butterfly valve 3 under normal circumstances. Similarly, the process of withdrawing the air outlet of the bag-type box 6 online is similar to the above process.

[0026] Preferably, the blind plate valve 1 is an open fan-shaped blind plate valve, which realizes complete physical isolation of the gas in the pipeline 5 through the cooperation of the fan-shaped valve plate and the valve body. It has good sealing performance, but is prone to leakage during the opening or closing process. The present invention effectively solves this problem by providing an electro-hydraulic air locking device 2.

[0027] More preferably, a manual latch is provided at the top of the push rod of the open sector blind plate valve to prevent the bag box 6 from being opened and closing the valve body when the cylinder gas source of the open sector blind plate valve is disconnected or loses pressure during normal production operation, causing the high-pressure blast furnace gas in the bag box 6 to leak out through the open sector blind plate valve, resulting in a large amount of gas leakage in the surrounding area.

[0028] Preferably, the blast furnace gas bag online switching box device further includes a relief valve 4, which is arranged between the blind plate valve 1 and the electro-hydraulic gas locking device 2. The relief valve 4 is connected to the blind plate valve 1 through a pipe 5, and the relief valve 4 is connected to the electro-hydraulic gas locking device 2 through a pipe 5. The gas is first released through the relief valve 4 before the blind plate valve 1 is closed.

[0029] More preferably, a metal compensator is provided between the pipeline 5 and the electric butterfly valve 3, the electro-hydraulic air lock device 2, the relief valve 4 or the fan-shaped blind plate valve 1 to achieve stress release and protect the stability of the pipeline 5 through elastic deformation. The connection between the pipeline 5 and the valve body can be equipped with a metal compensator according to actual needs. Figure 1 The location of the metal compensator is not shown.

[0030] The blast furnace gas bag online switching box device of the present invention can be remotely controlled. The electric butterfly valve 3, the electro-hydraulic air locking device 2, the relief valve 4 and the blind plate valve 1 are all controlled by the controller. Remote control is realized during the withdrawal or insertion of the bag box 6 to ensure the safety of gas area operations.

[0031] The installation of the blast furnace gas bag online switching box device of the present invention can be completed during the scheduled maintenance of the blast furnace gas bag box 6, or during other longer maintenance times.

[0032] Based on the above-mentioned blast furnace gas bag box online switching device, the present invention also proposes a bag box online switching method as follows: S1, bag box 6 exits the production line online; S11, the electric butterfly valve 3 at the raw gas inlet end of the bag box 6 is closed. After the electric butterfly valve 3 is fully closed, the electro-hydraulic air lock device 2 at the raw gas inlet end of the bag box 6 is closed; S12, after the electric butterfly valve 3 and the electro-hydraulic air lock device 2 at the raw gas inlet end of the bag box 6 are fully closed, the electric butterfly valve 3 and the electro-hydraulic air lock device 2 at the gas outlet end of the bag box 6 are closed; S13. After the electric butterfly valve 3 and the electro-hydraulic air locking device 2 at the air inlet and outlet ends of the bag box 6 are closed, the relief valve 4 is opened. After the pressure in the bag box 6 reaches the standard, the blind plate valve 1 at the air inlet and outlet ends of the bag box 6 is closed, and the bag box 6 completes the operation of exiting the production line online.

[0033] A manual bayonet is provided at the top end of the push rod of the blind flange valve 1 , and the manual bayonet of the blind flange valve 1 is locked in place after the blind flange valve 1 is closed.

[0034] S2. After the bag box 6 is purged of residual gas with nitrogen and replaced with compressed air, the manhole of the bag box 6 is opened to replace or overhaul the bags; S3. After completing the bag replacement or maintenance operation, close the manhole of the bag box 6 and put the bag box 6 back into the production line: S31, the blind valve 1 at the air inlet and outlet ends of the bag box 6 is opened, and the relief valve 4 is closed; S32, after the relief valve 4 is fully closed, the electro-hydraulic air lock device 2 at the air inlet end of the bag box 6 is opened; S33, after the electro-hydraulic air lock device 2 at the air inlet end of the bag box 6 is fully opened, the electric butterfly valve 3 is opened, and the raw gas enters the bag box 6; S34. After the pressure in the bag box 6 reaches the standard, the electric butterfly valve 3 at the air outlet end of the bag box 6 is opened first, and then the electro-hydraulic air locking device 2 is opened, and the bag box 6 is put into use on the production line.

[0035] Preferably, in step S11, the electric butterfly valve 3 at the raw gas inlet end of the bag box 6 is closed, and after the electric butterfly valve 3 valve closing signal is delayed for 5 seconds, the electro-hydraulic air locking device 2 at the raw gas inlet end of the bag box 6 is closed.

[0036] Preferably, in step S12, after the valve closing signal of the electro-hydraulic air locking device 2 at the raw gas inlet end of the bag box 6 is delayed for 5 seconds, the electric butterfly valve 3 and the electro-hydraulic air locking device 2 at the gas outlet end of the bag box 6 are closed, and the valve closing signal is set to be delayed for 5 seconds.

[0037] Preferably, in step S13, the relief valve 4 is relieved for 10-20 seconds.

[0038] More preferably, in step S13, when the pressure in the bag-filling box 6 is ≤3 kPa, the blind plate valves 1 at the air inlet and outlet ends of the bag-filling box 6 are closed.

[0039] Preferably, in step S31, the blind valves 1 at the air inlet and outlet ends of the bag box 6 are opened, and after the valve opening signal is delayed for 5 seconds, the relief valve 4 is closed.

[0040] Preferably, in step S32, after the valve closing signal of the relief valve 4 is delayed for 5 seconds, the electro-hydraulic air locking device 2 at the air inlet end of the bag box 6 is opened.

[0041] Preferably, in step S33, after the valve opening signal of the electro-hydraulic air locking device 2 at the air inlet end of the bag box 6 is delayed for 5 seconds, the electric butterfly valve 3 is opened, and the raw gas enters the bag box 6; Preferably, in step S33, after the pressure in the bag box 6 is ≦0.01 kPa, the electric butterfly valve 3 at the air outlet end of the bag box 6 is opened first, and after the valve opening signal is delayed for 5 seconds, the electro-hydraulic air locking device 2 is opened, and the bag box 6 is put into use on the production line.

[0042] The present invention can be promoted and used in the online switching application of blast furnace gas bag boxes 6 of large, medium and small blast furnaces in the same industry. During the online withdrawal of the blast furnace gas bag from production and online commissioning, there is no need to cooperate with blast furnace wind reduction, eliminating the impact on blast furnace production, and remotely controlling the valve switch. There is no gas leakage in the whole process, and the operation is safe and reliable.

[0043] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A blast furnace gas bag online switching box device, characterized in that: The invention comprises a pipeline (5), an electric butterfly valve (3), an electro-hydraulic air locking device (2) and a blind plate valve (1), wherein the blind plate valve (1) and the electro-hydraulic air locking device (2) are connected via the pipeline (5), the electro-hydraulic air locking device (2) and the electric butterfly valve (3) are connected via the pipeline (5), and the electro-hydraulic air locking device (2) is located between the blind plate valve (1) and the electric butterfly valve (3); and the blind plate valve (1) is connected to the air inlet end / air outlet end of the bag box (6) via the pipeline (5).

2. The blast furnace gas bag online switching box device according to claim 1, characterized in that: The blind plate valve (1) is an open sector-shaped blind plate valve.

3. The blast furnace gas bag online switching box device according to claim 2, characterized in that: A manual latch is provided at the top of the push rod of the open sector blind plate valve.

4. The blast furnace gas bag online switching box device according to any one of claims 1 to 3, characterized in that: The device further comprises a relief valve (4), which is arranged between the blind plate valve (1) and the electro-hydraulic air locking device (2). The relief valve (4) is connected to the blind plate valve (1) through a pipeline (5), and the relief valve (4) is connected to the electro-hydraulic air locking device (2) through a pipeline (5).

5. A bag box online switching method, characterized in that: The blast furnace gas bag online switching box device according to claim 4 is used as follows: S1, the bag box (6) exits the production line online; S11, the electric butterfly valve (3) at the raw gas inlet end of the bag box (6) is closed. After the electric butterfly valve (3) is closed, the electro-hydraulic air lock device (2) at the raw gas inlet end of the bag box (6) is closed; S12, after the electric butterfly valve (3) and the electro-hydraulic air lock device (2) at the raw gas inlet end of the bag box (6) are both closed, the electric butterfly valve (3) and the electro-hydraulic air lock device (2) at the gas outlet end of the bag box (6) are closed; S13, after the electric butterfly valve (3) and the electro-hydraulic air lock device (2) at the air inlet and air outlet of the bag box (6) are all closed, the relief valve (4) is opened, and after the pressure in the bag box (6) reaches the standard, the blind valve (1) at the air inlet and air outlet of the bag box (6) is closed, and the bag box (6) completes the operation of exiting the production line online; S2. After the bag box (6) is purged of residual gas with nitrogen and replaced with compressed air, the manhole of the bag box (6) is opened to perform bag replacement or overhaul operations; S3. After completing the bag replacement or maintenance operation, close the bag box (6) manhole and put the bag box (6) back into the production line: S31, the blind valves (1) at the air inlet and outlet ends of the bag box (6) are opened, and the relief valve (4) is closed; S32, after the relief valve (4) is fully closed, the electro-hydraulic air lock device (2) at the air inlet end of the bag box (6) is opened; S33, after the electro-hydraulic air lock device (2) at the air inlet end of the bag box (6) is fully opened, the electric butterfly valve (3) is opened, and the raw gas enters the bag box (6); S34. After the pressure in the bag box (6) reaches the standard, the electric butterfly valve (3) at the air outlet end of the bag box (6) is opened first, and then the electro-hydraulic air locking device (2) is opened, and the bag box (6) is put into use on the production line.

6. The bag box online switching method according to claim 5, characterized in that: In step S1, the valve closing signal is set to be delayed for 5 seconds.

7. The bag box online switching method according to claim 5, characterized in that: In step S13, the relief valve (4) is relieved for 10-20 seconds.

8. The bag box online switching method according to claim 7, characterized in that: In step S13, when the pressure in the bag box (6) is ≤3 kPa, the blind plate valves (1) at the air inlet and air outlet ends of the bag box (6) are closed.

9. The bag box online switching method according to claim 5, characterized in that: In step S3, the valve closing position signal is set to be delayed for 5 seconds, and the valve opening position signal is set to be delayed for 5 seconds.

10. The bag box online switching method according to claim 5, characterized in that: In step S33, after the pressure in the bag box (6) is less than or equal to 0.01 kPa, the electric butterfly valve (3) at the air outlet end of the bag box (6) is first opened, and after the valve opening signal is delayed for 5 seconds, the electro-hydraulic air locking device (2) is opened, and the bag box (6) is put into use on the production line.

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