Blast furnace pressure-equalizing diffused gas total recovery system

Abstract

The embodiment of the utility model provides a full-recovery system for pressure-equalizing diffused coal gas of a blast furnace. The full-recovery system comprises an ejector, a cyclone dust collector, a coal gas recovery tank, an ejection gas source pipeline, a first coal gas recovery pipeline, a second coal gas recovery pipeline, a first standby coal gas diffusion pipeline, a second standby coal gas diffusion pipeline and a pressure-equalizing clean coal gas main pipeline, the ejector is connected with the pressure-equalizing clean gas main pipeline through the ejection gas source pipeline, the ejector is connected with the cyclone dust collector through the first gas recovery pipeline, and the ejector is connected with the gas recovery tank through the second gas recovery pipeline; one end of the first standby gas diffusion pipeline is connected with the cyclone dust collector, and the other end of the first standby gas diffusion pipeline is emptied; one end of the second standby gas diffusion pipeline is connected with the cyclone dust collector, and the other end of the second standby gas diffusion pipeline is emptied.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace pressure equalization vent gas recovery, and in particular to a blast furnace pressure equalization vent gas full recovery system. Background Technology

[0002] The blast furnace top charge tank uses clean blast furnace gas for primary pressure equalization and nitrogen for secondary pressure equalization. A pressure equalization gas recovery system is installed to recover the blast furnace pressure equalization gas, preventing its discharge and environmental pollution, and achieving energy reuse. However, due to process and other factors, currently, much of the residual blast furnace gas in the pressure equalization tank cannot be fully recovered. Since the raw blast furnace gas (gas that has not undergone dust removal) has a high dust content, releasing the gas after pressure equalization is a waste of energy and environmental pollution.

[0003] In the process of realizing this utility model, the applicant discovered that the prior art has at least the following problems:

[0004] With increasingly stringent environmental protection requirements, the release of blast furnace pressure equalization gas is strictly prohibited. Therefore, ensuring the complete recovery of blast furnace pressure equalization vent gas is of paramount importance and is an urgent problem to be solved. Utility Model Content

[0005] This utility model provides a blast furnace pressure equalization venting gas full recovery system to solve the problem of how to achieve full recovery of blast furnace pressure equalization venting gas.

[0006] To achieve the above objectives, on the one hand, this utility model provides a blast furnace pressure equalization and venting gas full recovery system, including: an ejector, a cyclone dust collector, a gas recovery tank, an ejector gas source pipeline, a first gas recovery pipeline, a second gas recovery pipeline, a first backup gas venting pipeline, a second backup gas venting pipeline, and a pressure equalization clean gas main pipeline.

[0007] The ejector is connected to the pressure equalization clean gas main pipeline through the ejector gas source pipeline, the ejector is connected to the cyclone dust collector through the first gas recovery pipeline, and the ejector is connected to the gas recovery tank through the second gas recovery pipeline.

[0008] One end of the first backup gas venting pipeline is connected to the cyclone dust collector, and the other end of the first backup gas venting pipeline is vented.

[0009] One end of the second backup gas venting pipeline is connected to the cyclone dust collector, and the other end of the second backup gas venting pipeline is vented.

[0010] Wherein, the diameter of the ejector gas source pipeline is smaller than that of the pressure equalization clean gas main pipeline, the diameter of the second gas recovery pipeline is larger than that of the ejector gas source pipeline, and the diameter of the second gas recovery pipeline is larger than that of the first gas recovery pipeline.

[0011] Furthermore, a first pneumatic eccentric hemispherical valve, a first pneumatic sector blind valve, and a second pneumatic eccentric hemispherical valve are sequentially connected in series on the ejector gas source pipeline.

[0012] A third pneumatic eccentric ball valve, a first gas recovery valve, and a fourth pneumatic eccentric ball valve are connected in series on the first gas recovery pipeline.

[0013] A bypass vent pipe is connected to the middle of the second gas recovery pipeline, and a bypass vent valve is installed on the bypass vent pipe.

[0014] The first standby gas venting pipeline is equipped with a fifth pneumatic eccentric hemispherical valve and a first gas venting valve connected in series.

[0015] The second backup gas venting pipeline is equipped with a sixth pneumatic eccentric hemispherical valve, a second gas venting valve and a silencer connected in series, and the silencer vents the gas.

[0016] Furthermore, the ejector includes: an L-shaped ejector nozzle, and a tubular receiving chamber, a mixing chamber, and a diffuser chamber that are connected in series coaxially.

[0017] The receiving chamber includes a receiving chamber inlet section, a first bellows, and a receiving chamber outlet section connected coaxially in series.

[0018] The diameter of the receiving chamber is larger than the diameter of the mixing chamber, and the receiving chamber is connected to the mixing chamber via a tapered transition.

[0019] The mixing chamber is cylindrical in shape.

[0020] The diffuser chamber is a tapered tube with a small circular cross-section at one end and a large circular cross-section at the other end, and the small circular cross-section end of the diffuser tube is connected to the mixing chamber.

[0021] The L-shaped ejector nozzle passes through the side wall of the inlet section of the receiving chamber. The ejector inlet of the L-shaped ejector nozzle is located outside the receiving chamber, and the ejector outlet of the L-shaped ejector nozzle is located inside the receiving chamber, directly opposite the inlet of the mixing chamber. The axis of the ejector outlet is coaxial with that of the mixing chamber.

[0022] The ejector gas inlet is connected to the ejector gas source pipeline;

[0023] The first gas recovery pipeline is connected to the receiving chamber;

[0024] The second gas recovery pipeline is connected to the diffuser chamber.

[0025] Furthermore, the ejector gas outlet is equipped with a detachable nozzle; the nozzle is available in various lengths and inner diameters.

[0026] Furthermore, a second corrugated pipe is connected in series in the middle of the parallel pipe section of the L-shaped ejector nozzle, and the parallel pipe section is the pipe section of the L-shaped ejector nozzle that is coaxial with the mixing chamber.

[0027] Furthermore, the receiving chamber and the mixing chamber are connected via a first flange;

[0028] The mixing chamber and the diffuser chamber are connected by a second flange;

[0029] The ejector gas source pipeline is connected to the ejector gas inlet via a third flange;

[0030] The first gas recovery pipeline is connected to the receiving chamber via a fourth flange;

[0031] The second gas recovery pipeline is connected to the diffuser chamber via the fifth flange.

[0032] Furthermore, the system also includes an electrical control system; the electrical control system is connected to the first pneumatic eccentric ball valve, the first pneumatic sector blind valve, the second pneumatic eccentric ball valve, the third pneumatic eccentric ball valve, the first gas recovery valve, the fourth pneumatic eccentric ball valve, the bypass vent valve, the fifth pneumatic eccentric ball valve, the first gas vent valve, the sixth pneumatic eccentric ball valve, and the second gas vent valve.

[0033] Furthermore, the receiving chamber, mixing chamber, and diffuser chamber are all covered with a sound-absorbing layer.

[0034] The above technical solution has the following beneficial effects: By using an ejector to obtain uniformly pressurized clean gas from the main uniformly pressurized gas pipeline as the ejector gas source, the uniformly pressurized gas from the cyclone dust collector's hopper is ejected into the gas recovery tank. Through the suction of negative pressure and the push of positive pressure, the uniformly pressurized gas from the hopper is ejected and recovered, eliminating the need for the pressure relief operation of the furnace top uniformly pressurized vent valve and simplifying the process. When ejecting the uniformly pressurized gas recovery system from the hopper, because the pipeline network used for gas recovery is a closed loop, the purification and recovery rate of the uniformly pressurized gas from the hopper can be increased to 100%, recovering approximately 15% more uniformly pressurized gas than traditional devices. Simultaneously, since the original gas vent valve does not need to be opened, the gas purification and recovery time is reduced without increasing the operating rate of the furnace top equipment. This system is noise-reducing, energy-saving, and economical. It also has a small footprint, simple structure, convenient operation, and is easy to implement and maintain. Simply introduce the high-pressure, high-temperature clean coal gas into the clean coal gas pipeline of the pressure equalization coal gas recovery system, and online injection can be performed. No other large auxiliary equipment is required, and there is no additional electricity or power consumption. It is highly safe, requires less investment, and has low operating costs. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of 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 some embodiments of 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 working principle of a blast furnace pressure equalization and venting gas full recovery system, one of the embodiments of this utility model.

[0037] Figure 2 This is a schematic diagram of the internal structure of an ejector according to one embodiment of the present utility model;

[0038] Figure 3 This is a schematic diagram of the ejector structure of one embodiment of the present utility model;

[0039] Figure 4 This is a schematic diagram of another internal structure of the ejector in one embodiment of the present invention.

[0040] The attached figures are labeled as follows: 1. Ejector; 2. Cyclone dust collector; 3. Gas recovery tank; 4. Ejector gas source pipeline; 5. First gas recovery pipeline; 6. Second gas recovery pipeline; 7. First backup gas vent pipeline; 8. Second backup gas vent pipeline; 9. Main pressure equalization clean gas pipeline; 41. First pneumatic eccentric hemispherical valve; 42. First pneumatic sector blind valve; 43. Second pneumatic eccentric hemispherical valve; 51. Third pneumatic eccentric hemispherical valve; 52. First gas recovery valve; 53. Fourth pneumatic eccentric hemispherical valve; 61. Bypass vent pipeline; 62. Bypass vent valve; 71. Fifth pneumatic... 72. Eccentric hemispherical valve; 81. First gas vent valve; 82. Sixth pneumatic eccentric hemispherical valve; 83. Second gas vent valve; 84. Silencer; 15. L-shaped ejector nozzle; 16. Receiving chamber; 17. Mixing chamber; 18. Diffuser chamber; 191. Receiving chamber inlet section; 192. First bellows; 193. Receiving chamber outlet section; 194. Ejector gas inlet; 195. Ejector gas outlet; 106. Nozzle; 197. Second bellows; 198. First flange; 199. Second flange; 190. Third flange; 191. Fourth flange; 192. Fifth flange; 91. Equalizing vent valve. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] like Figure 1 As shown, this utility model embodiment provides a blast furnace pressure equalization venting gas full recovery system, including: ejector 1, cyclone dust collector 2, gas recovery tank 3, ejector gas source pipeline 4, first gas recovery pipeline 5, second gas recovery pipeline 6, first backup gas venting pipeline 7, second backup gas venting pipeline 8, and pressure equalization clean gas main pipeline 9.

[0043] The ejector 1 is connected to the pressure equalization clean gas main pipeline 9 through the ejector gas source pipeline 4, the ejector 1 is connected to the cyclone dust collector 2 through the first gas recovery pipeline 5, and the ejector 1 is connected to the gas recovery tank 3 through the second gas recovery pipeline 6.

[0044] One end of the first backup gas venting pipeline 7 is connected to the cyclone dust collector 2, and the other end of the first backup gas venting pipeline 7 is vented.

[0045] One end of the second backup gas venting pipeline 8 is connected to the cyclone dust collector 2, and the other end of the second backup gas venting pipeline 8 is vented.

[0046] Wherein, the diameter of the ejector gas source pipeline 4 is smaller than that of the pressure equalization clean gas main pipeline 9, the diameter of the second gas recovery pipeline 6 is larger than that of the ejector gas source pipeline 4, and the diameter of the second gas recovery pipeline 6 is larger than that of the first gas recovery pipeline 5.

[0047] In some embodiments, Figure 1A schematic diagram illustrating the working principle of the blast furnace equalization vent gas full recovery system according to an embodiment of this utility model is provided, along with a corresponding structural schematic diagram. The ejector gas source pipeline 4 of the ejector 1 obtains equalization clean gas from the equalization clean gas main pipeline 9 as the ejector gas source for the ejector 1. The outlet of the first gas recovery pipeline 5 is connected to the ejector 1, and the inlet of the first gas recovery pipeline 5 is connected to the cyclone dust collector 2. The furnace top equalization gas to be recovered, output from the cyclone dust collector 2, is propelled by the positive pressure from the cyclone dust collector 2 and enters the ejector 1 through the first gas recovery pipeline 5. In the ejector 1, under the suction of the negative pressure caused by the ejector gas source injection, the furnace top equalization gas is transported from the ejector 1 through the first gas recovery pipeline 5 to the gas recovery tank 3. During normal recovery of the furnace top equalization gas through the ejector, a closed network is formed from the cyclone dust collector 2 to the gas recovery tank 3, which can increase the purification and recovery rate of the equalization gas in the tank to 100%. Furthermore, the flow rate of the ejector gas source required by ejector 1 is significantly smaller than that of the equalizing clean gas main pipeline 9, and the diameter of the ejector gas source pipeline 4 is smaller than that of the equalizing clean gas main pipeline 9. Therefore, the start-up, shutdown, and operation of ejector 1 will not cause significant fluctuations in the flow rate of the equalizing clean gas main pipeline 9, and will not affect the original working performance of the equalizing clean gas main pipeline 9. Under normal circumstances, the equalizing gas from the furnace top is output from the cyclone dust collector 2, enters ejector 1 through the first gas recovery pipeline 5, and enters gas recovery tank 3 through the second gas recovery pipeline 6 after exiting ejector 1. When there is a problem with the recovery pipeline, the equalizing gas from the furnace top can be released through one or both of the first backup gas venting pipeline 7 and the second backup gas venting pipeline 8 to ensure that the system's production process can continue to operate.

[0048] The embodiments of this invention have the following technical advantages: By using an ejector to obtain uniformly pressurized clean gas from the main uniformly pressurized gas pipeline as the ejector gas source, the uniformly pressurized gas from the cyclone dust collector's hopper is ejected into the gas recovery tank. Through the attraction of negative pressure and the push of positive pressure, the uniformly pressurized gas from the hopper is ejected and recovered, eliminating the need for the pressure relief operation of the furnace top uniformly pressurized vent valve 91, thus simplifying the process. When ejecting the uniformly pressurized gas recovery system from the hopper, because the pipeline network used for gas recovery is a closed loop, the purification and recovery rate of the uniformly pressurized gas from the hopper can be increased to 100%, recovering approximately 15% more uniformly pressurized gas than traditional devices. Simultaneously, since the original gas vent valve does not need to be opened, the gas purification and recovery time is reduced without increasing the operating rate of the furnace top equipment. This system is noise-reducing, energy-saving, and economical. It also has a small footprint, simple structure, convenient operation, and is easy to implement and maintain. Simply introduce the high-pressure, high-temperature clean coal gas into the clean coal gas pipeline of the pressure equalization coal gas recovery system, and online injection can be performed. No other large auxiliary equipment is required, and there is no additional electricity or power consumption. It is highly safe, requires less investment, and has low operating costs.

[0049] Furthermore, such as Figure 1As shown, a first pneumatic eccentric hemispherical valve 41, a first pneumatic sector blind valve 42, and a second pneumatic eccentric hemispherical valve 43 are sequentially connected in series on the ejector gas source pipeline 4.

[0050] A third pneumatic eccentric ball valve 51, a first gas recovery valve 52, and a fourth pneumatic eccentric ball valve 53 are connected in series on the first gas recovery pipeline 5.

[0051] A bypass vent pipe 61 is connected to the middle of the second gas recovery pipeline 6, and a bypass vent valve 62 is provided on the bypass vent pipe 61.

[0052] The first standby gas venting pipeline 7 is equipped with a fifth pneumatic eccentric ball valve 71 and a first gas venting valve 72 connected in series.

[0053] The second backup gas venting pipeline 8 is equipped with a sixth pneumatic eccentric hemispherical valve 81, a second gas venting valve 82 and a silencer 83 connected in series, and the output of the silencer 83 is vented.

[0054] In some embodiments, the ejector gas source pipeline 4 is equipped with a first pneumatic eccentric hemispherical valve 41, a first pneumatic sector blind valve 42, and a second pneumatic eccentric hemispherical valve 43, which can disconnect the connection between the ejector 1 and the equalizing clean gas main pipeline 9 when ejection is not required. The first gas recovery pipeline 5 is equipped with a third pneumatic eccentric hemispherical valve 51, a first gas recovery valve 52, and a fourth pneumatic eccentric hemispherical valve 53, which can disconnect the connection between the ejector 1 and the cyclone dust collector when the ejector 1 is not used to recover the equalizing gas at the furnace top. One end of the bypass vent pipe 61 is connected to the second gas recovery pipeline 6, and the other end is vented. The bypass vent pipe 61 is equipped with a bypass vent valve 62, which can release pressure in the gas recovery tank when the pressure is too high, ensuring operational safety. A fifth pneumatic eccentric hemispherical valve 71 and a first gas venting valve 72 are connected in series on the first backup gas venting pipeline 7. A sixth pneumatic eccentric hemispherical valve 81, a second gas venting valve 82, and a silencer 83 are connected in series on the second backup gas venting pipeline 8. The silencer 83 vents the gas. When the ejector 1 is not used to recover the pressure-equalizing gas at the furnace top, the first backup gas venting pipeline 7 and / or the first backup gas venting pipeline 8 can be used to vent the pressure-equalizing gas at the furnace top. When the ejector 1 is used to recover the pressure-equalizing gas at the furnace top, the first backup gas venting pipeline 7 and the first backup gas venting pipeline 8 can be closed. The first gas recovery valve 52 can be, but is not limited to, a stacked valve or a pneumatic valve. The first gas venting valve 72 can be, but is not limited to, a stacked valve or a pneumatic valve. The second gas venting valve 82 can be, but is not limited to, a stacked valve or a pneumatic valve.

[0055] The embodiments of the present invention have the following technical effects: the opening and closing of each pipeline can be flexibly controlled by each valve body on each pipeline, thereby flexibly adjusting the working status of each pipeline according to the real-time working conditions, ensuring timely response to changes in working conditions, and safe production.

[0056] Furthermore, such as Figure 2 , Figure 3 and Figure 4 As shown, the ejector 1 includes: an L-shaped ejector gas nozzle 11, and a tubular receiving chamber 12, a mixing chamber 13, and a diffuser chamber 14 that are connected in series coaxially.

[0057] The receiving chamber 12 includes a receiving chamber inlet section 121, a first bellows 122 and a receiving chamber outlet section 123 connected in a coaxial series.

[0058] The diameter of the receiving chamber 12 is larger than the diameter of the mixing chamber 13, and the receiving chamber 12 is connected to the mixing chamber 13 by a tapered transition.

[0059] The mixing chamber 13 is in the shape of a straight cylindrical barrel;

[0060] The diffuser 14 is a tapered tube with a small circular cross-section at one end and a large circular cross-section at the other end, and the small circular cross-section end of the diffuser 14 is connected to the mixing chamber 13 through it.

[0061] The L-shaped ejector nozzle 11 passes through the side wall of the receiving chamber inlet section 121. The ejector inlet 15 of the L-shaped ejector nozzle 11 is located outside the receiving chamber 12, and the ejector outlet 16 of the L-shaped ejector nozzle 11 is located inside the receiving chamber 12, directly opposite the inlet of the mixing chamber 13. The axis of the ejector outlet 16 is coaxial with that of the mixing chamber 13.

[0062] The ejector gas inlet 15 is connected to the ejector gas source pipeline 4;

[0063] The first gas recovery pipeline 5 is connected to the receiving chamber 12;

[0064] The second gas recovery pipeline 6 is connected to the diffuser chamber 14.

[0065] In some embodiments, the axial length of the receiving chamber 12 can be adjusted by the first bellows 122. By adjusting the axial length of the first bellows 122, the distance from the ejector outlet 16 of the L-shaped ejector nozzle 11 to the inlet of the mixing chamber 13 can be adjusted, thereby setting the optimal distance according to specific operating conditions and optimizing the ejector performance.

[0066] Furthermore, such as Figure 2 and Figure 4As shown, the ejector gas outlet 16 is equipped with a detachable nozzle 17; the nozzle 17 has various lengths and inner diameter specifications.

[0067] In some embodiments, the nozzle 17 may have various lengths or inner diameters, thereby allowing adjustment of the distance from the nozzle 17 to the inlet of the mixing chamber 13 by replacing the nozzle 17 with a different length, or control of the injection flow rate by replacing the nozzle 17 with a nozzle 17 with a different inner diameter, depending on the specific operating conditions. When replacing the nozzle, technicians can enter the receiving chamber 12 through a manhole pre-installed on the side wall of the receiving chamber or through the interface connecting the receiving chamber 12 to the first gas recovery pipeline 5 and the second gas recovery pipeline 6.

[0068] The embodiments of the present invention have the following technical advantages: the replaceable nozzle 17 allows for adjustment of the distance from the nozzle 17 to the mixing chamber inlet according to working conditions without changing the overall axial dimension of the ejector, thereby achieving optimal working performance. This simplifies the support device for fixing the ejector and allows for adaptation to changes in working conditions within limited ejector installation space.

[0069] Furthermore, such as Figure 4 As shown, a second corrugated pipe 18 is connected in series in the middle of the parallel pipe section of the L-shaped ejector nozzle 11. The parallel pipe section is the pipe section of the L-shaped ejector nozzle 11 that is coaxial with the mixing chamber 13.

[0070] The embodiments of the present invention have the following technical advantages: Optimal working performance can be obtained by adjusting the distance from the nozzle 17 or the ejector gas outlet 16 to the mixing chamber inlet according to the operating conditions without changing the overall axial dimension of the ejector. This simplifies the support device for fixing the ejector and allows for adaptation to changes in operating conditions within limited ejector installation space.

[0071] Furthermore, such as Figure 2 , Figure 3 and Figure 4 As shown, the receiving chamber 12 and the mixing chamber 13 are connected by a first flange 191;

[0072] The mixing chamber 13 and the diffuser chamber 14 are connected by a second flange 192;

[0073] The ejector gas source pipeline 4 is connected to the ejector gas inlet 15 via a third flange 193;

[0074] The first gas recovery pipeline 5 is connected to the receiving chamber 12 via the fourth flange 194;

[0075] The second gas recovery pipeline 6 is connected to the diffuser chamber 14 via the fifth flange 195.

[0076] In some embodiments, flange connections are used at each connection between the ejector and the piping network to facilitate disassembly and maintenance.

[0077] Furthermore, the system also includes an electrical control system; the electrical control system is connected to the first pneumatic eccentric ball valve 41, the first pneumatic sector blind valve 42, the second pneumatic eccentric ball valve 43, the third pneumatic eccentric ball valve 51, the first gas recovery valve 52, the fourth pneumatic eccentric ball valve 53, the bypass vent valve 62, the fifth pneumatic eccentric ball valve 71, the first gas vent valve 72, the sixth pneumatic eccentric ball valve 81, and the second gas vent valve 82.

[0078] In some embodiments, the valves can be centrally controlled by an electronic control system, enabling remote and automatic control without the need for manual intervention at the equipment site. This improves the response speed to changes in operating conditions and enhances personnel safety.

[0079] Furthermore, the receiving chamber 12, mixing chamber 13, and diffuser chamber 14 are all covered with a sound-absorbing layer.

[0080] In some embodiments, the sound-absorbing layer reduces noise pollution during the recycling process, thereby improving the factory working environment.

[0081] The technical solutions of the present invention will be described in detail below with reference to specific application examples. For technical details not described in the implementation process, please refer to the relevant descriptions above.

[0082] The purpose of this invention is to provide a method and system for the complete recovery of blast furnace pressure equalization vent gas. This system is energy-saving, economical, occupies a small area, has a simple structure, is easy to operate, and is easy to implement and maintain. Furthermore, the system only requires introducing high-pressure, high-temperature clean gas into the clean gas pipeline of the pressure equalization gas recovery system for online injection, without the need for other large auxiliary equipment, and without any additional electricity or power consumption. It offers high safety, low investment, and low operating costs.

[0083] In this embodiment of the invention, an ejector 1 is added to the gas recovery pipeline at the highest platform of the furnace top (for easy layout and connection of related pipelines); the ejector gas source is led out from the riser below the vent valve of the DN650 (diameter 650 mm) equalization main pipe (equalization clean gas main pipe), and the outlet pipe diameter is DN400 (diameter 400 mm); two pneumatic eccentric hemispherical valves (first pneumatic eccentric hemispherical valve and second pneumatic eccentric hemispherical valve) are installed on the DN400 pipeline (ejector gas source pipeline), and a pneumatic sector blind valve (first pneumatic sector blind valve) is installed between the two pneumatic eccentric hemispherical valves to cut off the ejector gas source when needed. This system achieves zero emissions of top-pressure equalizing gas and dust. By recovering the top-pressure equalizing gas through an ejector, the need for opening the top-pressure equalizing vent valve for depressurization is eliminated, simplifying the process. The recovery process takes ≤12 seconds, improving charging efficiency compared to opening the valve. It also eliminates gas venting noise and extends the lifespan of the silencer. The recovery process has no impact on the clean gas pipeline network, resulting in no pressure fluctuations. Furthermore, the supporting electrical control system allows for centralized control and display within the blast furnace control room, offering convenient operation and easy, quick switching back to the original system for production without affecting the normal operation of the blast furnace.

[0084] The ejector is a detachable assembly. Furthermore, the ejector body is designed for disassembly and maintenance, comprising a nozzle, receiving chamber, mixing chamber, and diffuser chamber, all connected by flanges for easy disassembly and maintenance. The nozzle is connected to the ejector gas source, and its front section is a threaded, detachable structure, allowing for adjustment and replacement of different nozzle specifications as needed; it is located within the receiving chamber. A manhole is provided outside the receiving chamber for easy replacement and maintenance of internal components such as the nozzle. The receiving chamber features a corrugated compensation connection for adjustment to achieve optimal operating parameters; a flange at the rear of the receiving chamber connects to the mixing chamber. A diffuser chamber is installed at the output flange of the mixing chamber. The diffuser chamber also has a flange connection at its rear end. All components—the receiving chamber, mixing chamber, and diffuser chamber—are externally covered with a sound-absorbing layer.

[0085] The embodiments of the present invention have the following technical effects:

[0086] This method and apparatus for the complete recovery of blast furnace equalization vent gas is safe, easy to operate, and has reached an advanced level in the industry. Through the attraction of negative pressure and the propulsion of positive pressure, it achieves the injection and recovery of equalization gas from the charging tank, eliminating the need for opening the equalization vent valve at the furnace top to release pressure and simplifying the process. When injecting the equalization gas from the charging tank, the purification and recovery rate of the equalization gas can be increased to 100%, recovering approximately 15% more equalization gas than traditional devices. Simultaneously, since the original vent valve does not need to be opened, the gas purification and recovery time is reduced without increasing the operating rate of the furnace top equipment. It is noise-reducing, energy-saving, and economical. The method and apparatus have a small footprint, simple structure (only pipe and valve connections), and are easy to operate, implement, and maintain. Simply introduce the high-pressure, high-temperature clean gas into the clean gas pipeline of the equalization gas recovery system for online injection; no other large auxiliary equipment is required, and there is no additional electricity or power consumption. It boasts high safety, low investment, and low operating costs.

[0087] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to the specific order or hierarchy described.

[0088] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features in a single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, with each claim representing a separate preferred embodiment of the invention.

[0089] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use this invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the widest scope of the principles and novel features disclosed in this application.

[0090] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations falling within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is used in a manner similar to the term "including." Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0091] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A blast furnace pressure equalization and venting gas full recovery system, characterized in that, include: Ejector (1), cyclone dust collector (2), gas recovery tank (3), ejector gas source pipeline (4), first gas recovery pipeline (5), second gas recovery pipeline (6), first backup gas venting pipeline (7), second backup gas venting pipeline (8), and pressure equalization clean gas main pipeline (9). The ejector (1) is connected to the pressure equalization clean gas main pipeline (9) through the ejector gas source pipeline (4), the ejector (1) is connected to the cyclone dust collector (2) through the first gas recovery pipeline (5), and the ejector (1) is connected to the gas recovery tank (3) through the second gas recovery pipeline (6). One end of the first backup gas venting pipeline (7) is connected to the cyclone dust collector (2), and the other end of the first backup gas venting pipeline (7) is vented. One end of the second backup gas venting pipeline (8) is connected to the cyclone dust collector (2), and the other end of the second backup gas venting pipeline (8) is vented. The diameter of the ejector gas source pipeline (4) is smaller than that of the equalizing clean gas main pipeline (9), the diameter of the second gas recovery pipeline (6) is larger than that of the ejector gas source pipeline (4), and the diameter of the second gas recovery pipeline (6) is larger than that of the first gas recovery pipeline (5).

2. The blast furnace pressure equalization and venting gas full recovery system as described in claim 1, characterized in that, The ejector gas source pipeline (4) is provided with a first pneumatic eccentric hemispherical valve (41), a first pneumatic sector blind valve (42), and a second pneumatic eccentric hemispherical valve (43) connected in series. A third pneumatic eccentric ball valve (51), a first gas recovery valve (52), and a fourth pneumatic eccentric ball valve (53) are connected in series on the first gas recovery pipeline (5). The second gas recovery pipeline (6) is connected to a bypass vent pipe (61) in the middle, and a bypass vent valve (62) is provided on the bypass vent pipe (61); The first standby gas venting pipeline (7) is equipped with a fifth pneumatic eccentric ball valve (71) and a first gas venting valve (72) connected in series. The second standby gas venting pipeline (8) is connected in series with a sixth pneumatic eccentric ball valve (81), a second gas venting valve (82) and a silencer (83), the output of which is vented.

3. The blast furnace pressure equalization and venting gas full recovery system as described in claim 1, characterized in that, The ejector (1) includes: an L-shaped ejector nozzle (11), and a tubular receiving chamber (12), a mixing chamber (13), and a diffuser chamber (14) that are connected in series coaxially. The receiving chamber (12) includes a receiving chamber inlet section (121), a first bellows (122), and a receiving chamber outlet section (123) connected in series coaxially. The diameter of the receiving chamber (12) is larger than the diameter of the mixing chamber (13), and the receiving chamber (12) is connected to the mixing chamber (13) by a tapered transition. The mixing chamber (13) is a straight cylindrical shape; The diffuser (14) is a tapered tube with a small circular cross-section at one end and a large circular cross-section at the other end. The small circular cross-section end of the diffuser (14) is connected to the mixing chamber (13). The L-shaped ejector nozzle (11) passes through the side wall of the receiving chamber inlet section (121). The ejector inlet (15) of the L-shaped ejector nozzle (11) is located outside the receiving chamber (12). The ejector outlet (16) of the L-shaped ejector nozzle (11) is located inside the receiving chamber (12) and directly opposite the inlet of the mixing chamber (13). The axis of the ejector outlet (16) is coaxial with that of the mixing chamber (13). The ejector gas inlet (15) is connected to the ejector gas source pipeline (4); The first gas recovery pipeline (5) is connected to the receiving chamber (12); The second gas recovery pipeline (6) is connected to the diffuser chamber (14).

4. The blast furnace pressure equalization and venting gas full recovery system as described in claim 3, characterized in that, The ejector gas outlet (16) is equipped with a detachable nozzle (17); the nozzle (17) is available in various lengths and inner diameters.

5. The blast furnace pressure equalization and venting gas full recovery system as described in claim 3 or 4, characterized in that, A second corrugated pipe (18) is connected in series in the middle of the parallel pipe section of the L-shaped ejector nozzle (11). The parallel pipe section is the pipe section of the L-shaped ejector nozzle (11) that is coaxial with the mixing chamber (13).

6. The blast furnace pressure equalization and venting gas full recovery system as described in claim 3, characterized in that, The receiving chamber (12) and the mixing chamber (13) are connected by a first flange (191); The mixing chamber (13) and the diffuser chamber (14) are connected by a second flange (192); The ejector gas source pipeline (4) is connected to the ejector gas inlet (15) via a third flange (193); The first gas recovery pipeline (5) is connected to the receiving chamber (12) via a fourth flange (194); The second gas recovery pipeline (6) is connected to the diffuser chamber (14) via the fifth flange (195).

7. The blast furnace pressure equalization and venting gas full recovery system as described in claim 2, characterized in that, The system also includes an electronic control system; The electrical control system is connected to the first pneumatic eccentric ball valve (41), the first pneumatic sector blind valve (42), the second pneumatic eccentric ball valve (43), the third pneumatic eccentric ball valve (51), the first gas recovery valve (52), the fourth pneumatic eccentric ball valve (53), the bypass vent valve (62), the fifth pneumatic eccentric ball valve (71), the first gas vent valve (72), the sixth pneumatic eccentric ball valve (81), and the second gas vent valve (82).

8. The blast furnace pressure equalization and venting gas full recovery system as described in claim 3, characterized in that, The receiving chamber (12), mixing chamber (13), and diffuser chamber (14) are all covered with a sound-absorbing layer.

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