Blast furnace damping-down gas full-recovery system adopting gas injection common method

Abstract

The utility model discloses a blast furnace damping-down gas total recovery system adopting a gas injection common method, which comprises a gathering pipeline, a first connecting end and a second connecting end, wherein the gathering pipeline is provided with a plurality of diffusion pipelines and damping-down ejectors, and the first connecting end and the second connecting end are arranged in parallel; one end of the external pipeline is connected with a clean gas pipe network, and the other end of the external pipeline is connected with the damping down ejector; the first dry processing pipeline is connected with the first connecting end; and the second dry processing pipeline is connected with the second connecting end. Through three core modules of cross-blast furnace gas source sharing, ejector negative pressure extraction and parallel dry method treatment, and in combination with nitrogen purging and redundant pipeline design, full-process safe recovery of damping-down gas is realized. Through energy transfer of the adjacent blast furnaces, the problem of gas source interruption in the prior art is solved, meanwhile, the cost is reduced through old design and modular layout, and finally the purposes of zero emission and high recovery rate are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of gas recovery technology, and in particular relates to a blast furnace shutdown gas recovery system using a combined gas injection method. Background Technology

[0002] During blast furnace smelting, the blast furnace shut-off gas is typically released directly into the atmosphere. This shut-off gas is a toxic, combustible mixture containing large amounts of CO, CO2, and dust, causing air pollution and wasting energy. During blast furnace maintenance shutdowns, large amounts of dust-laden gas are generated and directly emitted into the atmosphere, severely impacting the environment. Currently, there is a full shut-off gas recovery technology that uses a shut-off gas recovery system to recover the shut-off gas. However, when the grid pressure after recovery is comparable to the blast furnace pressure, an active recovery system is needed to extract the blast furnace top gas and connect it to the grid. The active injection gas source uses blast furnace gas. Since the shut-off system would take the blast furnace system out of production, this gas source cannot be used during shutdowns. Utility Model Content

[0003] The purpose of this invention is to provide a blast furnace shutdown gas recovery system using a gas injection method, in order to solve the technical problems of gas source interruption and low recovery rate during shutdown.

[0004] To solve the above-mentioned technical problems, the specific technical solution of this utility model is as follows:

[0005] In some embodiments of this application, a blast furnace shutdown gas full recovery system using a gas ejector-based common method is provided, including:

[0006] A central conduit is provided with several venting conduits and a wind ejector, as well as a first connection end and a second connection end arranged in parallel.

[0007] An external pipeline, one end of which is connected to the clean gas pipeline network, and the other end of which is connected to the ventilation ejector;

[0008] The first dry treatment pipeline is connected to the first connection end;

[0009] The second dry treatment pipeline is connected to the second connection terminal.

[0010] In some embodiments of this application, the external pipeline includes:

[0011] The first pipeline has one end connected to the clean gas pipeline network and the other end connected to the ventilation ejector. It is equipped with a manual gate valve, a butterfly valve and a blind valve, and a venting pipeline is provided between the butterfly valve and the blind valve.

[0012] The second pipeline has one end connected to the butterfly valve of the first pipeline, and the other end connected to the first pipeline through a pneumatic vent valve. It is also connected to the nearest nitrogen pipeline through a control valve.

[0013] A nitrogen purging valve is provided between the first pipeline and the second pipeline, and the nitrogen purging valve is located on the side away from the blind valve.

[0014] In some embodiments of this application, the conduit includes

[0015] The third pipeline is connected at one end to the air ejector and at the other end to the first dry treatment pipeline. It is equipped with a pneumatic ejector valve, a blind flange and a butterfly valve, and a venting pipeline is provided between the pneumatic ejector valve, the blind flange and the butterfly valve.

[0016] The fourth pipeline is connected to the first dry treatment pipeline and the second dry treatment pipeline at both ends, and is equipped with a butterfly valve and a blind valve arranged symmetrically. A venting pipeline is provided between the butterfly valve and the blind valve. The butterfly valve of the fourth pipeline is equipped with a first branch pipeline, which is connected to the nearest nitrogen pipeline. Nitrogen purge valves are provided on both sides of the blind valve of the fourth pipeline and are connected to the fourth pipeline.

[0017] The fifth pipeline has one end located between the pneumatic ejector valve and the blind plate of the fourth pipeline, and the other end connected to the second dry processing pipeline. It is equipped with a blind plate and a butterfly valve, and has venting pipelines on both sides of the blind plate.

[0018] The sixth pipeline is connected at one end to the air ejector and at the other end to the fourth pipeline. It is located between the blind valves symmetrically arranged in the fourth pipeline, and a gas analyzer is installed on it. It is also connected to the fifth pipeline.

[0019] The second branch pipeline has one end connected to the butterfly valve on the third pipeline and the other end connected to the nearest nitrogen pipeline. It is also connected to the pneumatic ejector valve on the third pipeline. Nitrogen purge valves are provided on both sides of the blind plate of the third pipeline. The nitrogen purge valves enable the third pipeline and the second branch pipeline to be arranged in parallel.

[0020] The third branch pipeline has one end connected to the butterfly valve of the fifth pipeline and the other end connected to the second branch pipeline. Nitrogen purging valves are provided on both sides of the blind plate of the fifth pipeline, and the fifth pipeline and the third branch pipeline are connected in parallel through the nitrogen purging valves.

[0021] In some embodiments of this application, the first dry processing pipeline and the second dry processing pipeline have the same structure, including:

[0022] A dry inlet manifold, wherein the air inlet end of the dry inlet manifold is connected to an external air source, and the air outlet end is provided with dry processing components arranged in parallel.

[0023] A dry process outlet manifold, wherein the air inlet end of the dry process outlet manifold is connected to the air outlet end of the dry process treatment component;

[0024] The dry outlet main of the first dry treatment pipeline is connected to the third and fourth pipelines respectively, and the dry outlet main of the second dry treatment pipeline is connected to the fifth and fourth pipelines respectively.

[0025] In some embodiments of this application, the dry processing component is a modular structure, including:

[0026] A dry inlet valve assembly, wherein the inlet end of the dry inlet valve assembly is connected to the dry inlet manifold;

[0027] The reused dry process chamber is connected to the air outlet of the dry process inlet valve assembly.

[0028] The dry process outlet valve assembly has its inlet end connected to the outlet end of the reused dry process housing, and its outlet end connected to the inlet end of the dry process outlet main pipe.

[0029] Compared with existing technologies, the advantages of this invention lie in its ability to achieve safe full-process recovery of shut-in blast furnace gas through three core modules: shared gas source across blast furnaces, negative pressure extraction via ejectors, and parallel dry treatment, combined with nitrogen purging and redundant pipeline design. It solves the problem of gas source interruption in traditional technologies by "energy transfer" between adjacent blast furnaces, while reducing costs through reuse of existing materials and modular layout, ultimately achieving the goal of zero emissions and high recovery rate. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0031] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;

[0032] Figure 2 This is a schematic diagram of the external pipeline structure provided in an embodiment of the present utility model;

[0033] Figure 3 This is a schematic diagram of the overall pipeline structure provided in an embodiment of the present utility model;

[0034] Figure 4This is a schematic diagram of the fourth pipeline structure provided in an embodiment of the present utility model;

[0035] Figure 5 A schematic diagram of the first dry treatment pipeline / second dry treatment pipeline structure provided for embodiments of this utility model. Detailed Implementation

[0036] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0037] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model is provided below with reference to the accompanying drawings.

[0038] See appendix Figures 1-5 As shown, according to some embodiments of this application, it includes:

[0039] External pipeline 2, one end of which is connected to the clean gas pipeline network, and the other end is connected to the ventilation ejector; it should be noted that external pipeline 2 includes:

[0040] The first pipeline 201 is connected at one end to the clean gas pipeline network and at the other end to the ventilation ejector. It is equipped with a manual gate valve, a butterfly valve and a blind valve, and a venting pipeline is provided between the butterfly valve and the blind valve.

[0041] The second pipeline 202 has one end connected to the butterfly valve of the first pipeline 201, and the other end connected to the first pipeline 201 through a pneumatic vent valve. It is also connected to the nearest nitrogen pipeline through a control valve.

[0042] A nitrogen purging valve is provided between the first pipeline 201 and the second pipeline 202, and the nitrogen purging valve is located on the side away from the blind valve.

[0043] A main pipeline 1 is provided with several venting pipelines and a wind ejector, as well as a first connecting end and a second connecting end arranged in parallel.

[0044] It should be noted that the main pipeline 1 includes

[0045] The third pipeline 101 is connected at one end to the air ejector and at the other end to the first dry treatment pipeline 3. It is equipped with a pneumatic ejector valve, a blind plate and a butterfly valve, and a venting pipeline is provided between the pneumatic ejector valve, the blind plate and the butterfly valve.

[0046] The fourth pipeline 102 is connected to the first dry treatment pipeline 3 and the second dry treatment pipeline 4 at both ends, and is equipped with a butterfly valve and a blind valve arranged symmetrically. A venting pipeline is provided between the butterfly valve and the blind valve. The butterfly valve of the fourth pipeline 102 is equipped with a first branch pipeline 1021, which is connected to the nearest nitrogen pipeline. Nitrogen purge valves are provided on both sides of the blind valve of the fourth pipeline 102 and are connected to the fourth pipeline 102.

[0047] The fifth pipeline 103 is located at one end between the pneumatic ejector valve and the blind plate of the fourth pipeline 102, and the other end is connected to the second dry treatment pipeline 4. It is equipped with a blind plate and a butterfly valve, and venting pipelines are provided on both sides of the blind plate.

[0048] The sixth pipeline 104 is connected at one end to the air ejector and at the other end to the fourth pipeline 102. It is located between the blind valves symmetrically arranged in the fourth pipeline 102. A gas analyzer is installed on it and it is connected to the fifth pipeline 103.

[0049] The second branch pipe 105 has one end connected to the butterfly valve on the third pipe 101 and the other end connected to the nearest nitrogen pipe. It is also connected to the pneumatic ejector valve on the third pipe 101. Nitrogen purge valves are provided on both sides of the blind plate of the third pipe 101. The nitrogen purge valves enable the third pipe 101 and the second branch pipe 105 to be arranged in parallel.

[0050] The third branch pipe 106 is connected at one end to the butterfly valve of the fifth pipe 103 and at the other end to the second branch pipe 105. Nitrogen purging valves are provided on both sides of the blind plate of the fifth pipe 103, and the fifth pipe 103 and the third branch pipe 106 are connected in parallel through the nitrogen purging valves.

[0051] The first dry treatment pipeline 3 is connected to the first connection end;

[0052] The second dry treatment pipeline 4 is connected to the second connection end.

[0053] The first dry treatment pipeline 3 and the second dry treatment pipeline 4 have the same structure, including:

[0054] Dry inlet manifold 301, the air inlet end of which is connected to an external air source, and the air outlet end of which is provided with dry processing components 302 arranged in parallel.

[0055] Dry process outlet manifold 302, the air inlet of which is connected to the air outlet of dry process processing component 302.

[0056] Among them, the dry outlet main pipe 302 of the first dry treatment pipeline 3 is connected to the third pipeline 101 and the fourth pipeline 102 respectively, and the dry outlet main pipe 302 of the second dry treatment pipeline 4 is connected to the fifth pipeline 103 and the fourth pipeline 102 respectively.

[0057] The dry processing component 302 has a modular structure, including:

[0058] A dry inlet valve assembly, wherein the inlet end of the dry inlet valve assembly is connected to the dry inlet manifold 301;

[0059] The reused dry process chamber is connected to the air outlet of the dry process inlet valve assembly.

[0060] The dry process outlet valve assembly has its inlet end connected to the outlet end of the reused dry process housing, and its outlet end connected to the inlet end of the dry process outlet manifold 302.

[0061] In this application, the clean gas from the adjacent production blast furnace is used as the ejector gas source to actively extract the dust-containing gas from the shut-down blast furnace. After dry treatment and purification, the gas is incorporated into the gas pipeline network to achieve full recovery. The external pipeline 2 is connected to the clean gas pipeline network of the adjacent blast furnace, the main pipeline 1 adopts an ejector and multiple branch switching, and the first / second dry treatment pipeline 4 is connected to the dust removal system in parallel. The nitrogen purging and venting system provides safety assurance.

[0062] The workflow is as follows:

[0063] Procedure for connecting the ejector gas source (external pipeline 2):

[0064] Start the gas supply from the adjacent blast furnace: Open the manual gate valve → butterfly valve → blind valve of the first pipeline 201 to introduce the clean coal gas from the adjacent blast furnace (Blast Furnace B) into the system. The second pipeline 202 is on standby: If emergency pressure relief is required, discharge part of the coal gas into the vent pipe through the pneumatic vent valve, and dilute it by connecting to the nitrogen pipeline through the control valve.

[0065] Nitrogen purging: Before operation, purge the first and second pipelines 202 through the nitrogen purging valve to replace residual air and prevent the gas from mixing with air and exploding.

[0066] The high-pressure clean gas (approximately 20-30 kPa) from blast furnace B enters the idle ejector through external pipeline 2, serving as a power source to drive the ejector.

[0067] Ejector start-up and gas extraction (main pipeline 1) operation steps:

[0068] Start the ejector: Open the pneumatic ejector valve → butterfly valve on the third pipeline 101, and close the blind valve to allow the B blast furnace gas to enter the ejector nozzle. The gas is ejected at high speed at the ejector nozzle (flow velocity > 50 m / s), forming a negative pressure (approximately -5 kPa) in the mixing section, which draws in the dust-laden gas from the top of the A blast furnace (shutdown blast furnace).

[0069] Path switching: Normal operating condition: Gas enters the first dry treatment pipeline 3 through the third pipeline 101.

[0070] Abnormal operating conditions (such as blockage of the first dry method pipeline): Close the third pipeline 101 and switch to the second dry method treatment pipeline 4 through the fourth and fifth pipelines 103.

[0071] The ejector generates negative pressure through a high-speed gas flow (B blast furnace gas) to actively extract A blast furnace gas (flow rate approximately 100,000 Nm³). 3 / h).

[0072] Mixed gas: A. Blast furnace gas (containing 20-30% CO and 5-10g / Nm³ of dust) 3 After being mixed with the clean gas from blast furnace B, the pressure is increased to 5-10 kPa and then enters the dry processing system.

[0073] Gas purification (first / second dry treatment pipeline 4) operation steps:

[0074] Dry treatment inlet: The mixed gas enters the dry inlet valve group through the dry inlet main pipe 301 and is distributed to multiple parallel reuse dry treatment boxes (such as bag filters).

[0075] A single dry-process enclosure has a processing capacity of approximately 50,000 Nm³. 3 / h, multiple units can be operated in parallel (e.g., 4 units).

[0076] Dust removal process: Dust-laden coal gas is filtered through a bag filter, with a dust removal rate >99.9% and an outlet gas dust content <10mg / Nm³. 3 .

[0077] Export and grid connection: The purified gas passes through the dry method outlet main pipe 302 → the third pipeline 101 (or the fourth or fifth pipeline 103) → the clean gas pipeline network.

[0078] If the first dry pipeline fails, close the third pipeline 101, open the butterfly valve → blind valve of the fourth pipeline 102, switch to the second dry pipeline, and ensure continuous operation.

[0079] Pressure balance and safety control, pressure regulation:

[0080] If the grid connection pressure is too high: release the pressure through the venting pipe of the fourth pipe 102, or switch to the second dry pipe for diversion.

[0081] Ejector efficiency maintenance: CO concentration (threshold <24%) is monitored via a gas analyzer in the sixth line 104 to prevent explosion risk.

[0082] Nitrogen protection:

[0083] Pre-operation purging: Purge the third and fifth pipelines 103 through the nitrogen purging valves of the second branch pipeline 105 and the third branch pipeline 106 (nitrogen flow rate approximately 500 Nm). 3 / h).

[0084] Shutdown protection: After shutting down the ejector, immediately open the nitrogen purging valve to replace the residual coal gas.

[0085] Emergency evacuation:

[0086] If the system is overpressured (>15kPa), pressure should be quickly released through the venting pipes of each pipeline (such as the venting pipe between the butterfly valve and the blind valve in the first pipeline 201) to avoid equipment damage.

[0087] System shutdown and recovery procedures: Gradually close the butterfly valve → blind valve of blast furnace B to cut off the ejector gas source. Open the nitrogen purging valve to purge residual gas from external pipeline 2 and main pipeline 1 (time > 30 minutes). Close the pneumatic ejector valve and switch back to blast furnace A's own gas system (restore production status).

[0088] Ejector efficiency: The ejector ratio (ejector gas volume / driving gas volume) is approximately 1:1.5, i.e., 1 Nm³ / min. 3 B blast furnace gas can be extracted at a rate of 1.5 Nm³. 3 A. Blast furnace gas.

[0089] Environmental protection standard: Dust emission <10mg / Nm 3 CO recovery rate >99%, annual CO emission reduction of approximately 50,000 tons (based on 2000m³). 3 (Taking the blast furnace as an example).

[0090] The calorific value of the recovered coal gas is approximately 850 kcal / Nm³. 3 The annual power generation will increase by approximately 20 million kWh (based on a 50% power generation efficiency).

[0091] Valve operation sequence: Nitrogen purging → Open B blast furnace gas source valve → Start ejector → Open dry treatment pipeline → Connect to grid. Reverse the operation during shutdown, prioritizing nitrogen purging.

[0092] Automated control: The gas analyzer signal is linked to the pneumatic vent valve, which automatically opens to vent when the CO concentration exceeds the standard.

[0093] The technical effects achieved by the above technical solution in the embodiments of this application are as follows:

[0094] A passive and active gas recovery system for blast furnace shutdown gas recovery was implemented by separately arranging these systems within the shutdown gas recovery system. In the active recovery system, blast furnace gas is used as the injection gas source during the initial gas recovery phase. However, since a shutdown of this blast furnace would render the entire system inactive, the gas source from another blast furnace gas system is used as the injection gas source for this shutdown gas recovery process. Therefore, the two blast furnaces become a shared gas injection system for shutdown gas recovery. This process is implemented within a full shutdown gas recovery system. Considering layout, process feasibility, and cost, a full shutdown gas recovery system for two adjacent blast furnaces is adopted. During the active gas recovery phase, the injection gas from one blast furnace gas system is mutually utilized to power the shutdown gas recovery system for the other blast furnace, ensuring the process feasibility of the shutdown process for both blast furnaces. This system, integrated with a shutdown venting and full recovery system, fully recovers blast furnace gas during shutdowns. It ensures that during a blast furnace shutdown, the active recovery unit's injection gas source utilizes the gas system of another normally operating blast furnace. This guarantees a high-pressure blast furnace gas supply unaffected by the shutdown process, especially during the active recovery phase, ensuring full recovery of shutdown gas. By using another blast furnace as the injection gas source, the system ensures full recovery of furnace gas during shutdowns, unaffected by the shutdown process itself. The overall system is safe, reliable, and meets environmental protection requirements, reducing air pollution and coordinating with clean gas recovery to meet environmental standards.

[0095] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0096] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0097] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0098] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0099] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A blast furnace shutdown gas full recovery system using a gas injection and shared method, characterized in that: include: A central conduit is provided with several venting conduits and a wind ejector, as well as a first connection end and a second connection end arranged in parallel. An external pipeline, one end of which is connected to the clean gas pipeline network, and the other end of which is connected to the ventilation ejector; The first dry treatment pipeline is connected to the first connection end; The second dry treatment pipeline is connected to the second connection terminal.

2. The blast furnace shutdown gas full recovery system using the gas ejector and shared method according to claim 1, characterized in that, The external pipeline includes: The first pipeline has one end connected to the clean gas pipeline network and the other end connected to the ventilation ejector. It is equipped with a manual gate valve, a butterfly valve and a blind valve, and a venting pipeline is provided between the butterfly valve and the blind valve. The second pipeline has one end connected to the butterfly valve of the first pipeline, and the other end connected to the first pipeline through a pneumatic vent valve. It is also connected to the nearest nitrogen pipeline through a control valve. A nitrogen purging valve is provided between the first pipeline and the second pipeline, and the nitrogen purging valve is located on the side away from the blind valve.

3. The blast furnace shutdown gas full recovery system using the gas ejector method according to claim 1, characterized in that, The aggregation pipeline includes The third pipeline is connected at one end to the air ejector and at the other end to the first dry treatment pipeline. It is equipped with a pneumatic ejector valve, a blind flange and a butterfly valve, and a venting pipeline is provided between the pneumatic ejector valve, the blind flange and the butterfly valve. The fourth pipeline is connected to the first dry treatment pipeline and the second dry treatment pipeline at both ends, and is equipped with a butterfly valve and a blind valve arranged symmetrically. A venting pipeline is provided between the butterfly valve and the blind valve. The butterfly valve of the fourth pipeline is equipped with a first branch pipeline, which is connected to the nearest nitrogen pipeline. Nitrogen purge valves are provided on both sides of the blind valve of the fourth pipeline and are connected to the fourth pipeline. The fifth pipeline has one end located between the pneumatic ejector valve and the blind plate of the fourth pipeline, and the other end connected to the second dry processing pipeline. It is equipped with a blind plate and a butterfly valve, and has venting pipelines on both sides of the blind plate. The sixth pipeline is connected at one end to the air ejector and at the other end to the fourth pipeline. It is located between the blind valves symmetrically arranged in the fourth pipeline, and a gas analyzer is installed on it. It is also connected to the fifth pipeline. The second branch pipeline has one end connected to the butterfly valve on the third pipeline and the other end connected to the nearest nitrogen pipeline. It is also connected to the pneumatic ejector valve on the third pipeline. Nitrogen purge valves are provided on both sides of the blind plate of the third pipeline. The nitrogen purge valves enable the third pipeline and the second branch pipeline to be arranged in parallel. The third branch pipeline has one end connected to the butterfly valve of the fifth pipeline and the other end connected to the second branch pipeline. Nitrogen purging valves are provided on both sides of the blind plate of the fifth pipeline, and the fifth pipeline and the third branch pipeline are connected in parallel through the nitrogen purging valves.

4. The blast furnace shutdown gas full recovery system using the gas ejector sharing method according to claim 3, characterized in that, The first dry treatment pipeline and the second dry treatment pipeline have the same structure, including: A dry inlet manifold, wherein the air inlet end of the dry inlet manifold is connected to an external air source, and the air outlet end is provided with dry processing components arranged in parallel. A dry process outlet manifold, wherein the air inlet end of the dry process outlet manifold is connected to the air outlet end of the dry process treatment component; The dry outlet main of the first dry treatment pipeline is connected to the third and fourth pipelines respectively, and the dry outlet main of the second dry treatment pipeline is connected to the fifth and fourth pipelines respectively.

5. The blast furnace shutdown gas recovery system using the gas ejector method according to claim 4, characterized in that, The dry processing component is a modular structure, including: A dry inlet valve assembly, wherein the inlet end of the dry inlet valve assembly is connected to the dry inlet manifold; The reused dry process chamber is connected to the air outlet of the dry process inlet valve assembly. The dry process outlet valve assembly has its inlet end connected to the outlet end of the reused dry process housing, and its outlet end connected to the inlet end of the dry process outlet main pipe.

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