Blast furnace coke oven gas recovery device
By introducing pressure buffer components and a pressure stabilizing system into the blast furnace gas recovery device, the problems of equipment damage and dust removal efficiency fluctuations caused by gas pressure fluctuations have been solved, achieving stable gas recovery and efficient utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUANGDONG TAIDU STEEL IND CO LTD
- Filing Date
- 2026-04-15
- Publication Date
- 2026-05-29
Smart Images
Figure CN122105027A_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present invention relate to the field of blast furnace gas recovery technology, specifically to a blast furnace gas recovery device. Background Technology
[0002] Blast furnace gas is a core by-product combustible gas produced during blast furnace ironmaking and is an important secondary energy source for the steel industry. Its efficient recovery and utilization is a key link in promoting energy conservation, carbon reduction, cost reduction, efficiency improvement, and pollutant emission reduction in the steel industry. Currently, the mainstream process for blast furnace gas recovery in the industry adopts the process route of "gravity coarse dust removal - bag filter fine dust removal - gas storage and buffering - pipeline transportation". Among them, gravity dust removal is the mainstream application technology in the coarse dust removal stage due to its large gas volume handling capacity, low operating resistance, and low operation and maintenance costs.
[0003] In practical industrial applications, existing equipment still has many technical challenges. The blast furnace smelting conditions fluctuate frequently due to factors such as raw materials, air supply, and furnace condition adjustments, resulting in severe instantaneous pulsations in the output pressure and flow rate of the gas. When the crude gas is directly fed into the gravity dust collector, it causes a sudden rise and fall in pressure inside the collector. This not only exerts a strong pressure impact on the collector, subsequent dust collection equipment, and pipeline valves, leading to safety hazards such as equipment fatigue damage and gas leakage, but also disrupts the flow field inside the collector, destroying the stable environment for dust gravity settling. This results in significant fluctuations in coarse dust removal efficiency, increases the load on subsequent bag filters, and shortens the service life of the filter bags. Summary of the Invention
[0004] To overcome the above-mentioned defects, embodiments of the present invention provide a blast furnace gas recovery device, which solves the technical problem of poor gas recovery stability in related technologies.
[0005] According to one aspect, at least one embodiment of the present invention provides a blast furnace gas recovery device, comprising: The gravity dust collector is vertically arranged. The top of the gravity dust collector is provided with an air inlet pipe and an air outlet pipe, and the bottom of the gravity dust collector is provided with a dust discharge pipe. The air inlet pipe is used to connect with the gas outlet of the blast furnace, and the air outlet end of the air inlet pipe extends into the interior of the gravity dust collector. A pressure buffer assembly is disposed on the side wall of the gravity dust collector, the pressure buffer assembly having a pressure buffer chamber that is connected to the gravity dust collector. A bag filter is connected to the air outlet pipe; A gas storage tank is connected to the outlet of the bag filter. The gas storage tank is used to store gas, and the outlet is used to connect to the gas utilization pipeline network.
[0006] In one possible implementation, the pressure buffer component includes: The guide pipe is connected to the gravity dust collector at both its upper and lower ends, and the outlet of the air inlet pipe is located between the upper and lower ends of the guide pipe.
[0007] In one possible implementation, The guide pipes are arranged at intervals along the circumference of the gravity dust collection tank, and the pressure buffer assembly further includes: A pressure equalization connecting pipe, the two ends of which are respectively connected to two adjacent guide pipes.
[0008] In one possible implementation, The portion of the air inlet pipe located inside the gravity dust collector is an extension section, and the inner diameter of the extension section gradually increases from the inlet end to the outlet end.
[0009] One possible implementation also includes: A collector is disposed inside the gravity dust collector tank. The collector is located below the air outlet end of the air inlet pipe. The collector has a conical channel whose diameter gradually decreases from top to bottom.
[0010] In one possible implementation, There is an exhaust gap between the manifold and the exhaust end of the intake pipe.
[0011] In one possible implementation, The diameter of the upper end of the conical channel is larger than the diameter of the air outlet end of the air inlet pipe, and the diameter of the lower end of the conical channel is smaller than the diameter of the air outlet end of the air inlet pipe.
[0012] In one possible implementation, The gravity dust collector is divided into an exhaust section, a dust collection section, and a debris collection section from top to bottom. The cross-sectional area of the dust collection section gradually increases from the top to the bottom, and the exhaust end of the air inlet pipe is located in the dust collection section.
[0013] In one possible implementation, The pressure equalization connecting pipe is inclined, and one end of the pressure equalization connecting pipe is higher than the other end.
[0014] One possible implementation also includes: An annular mesh is installed inside the gravity dust collector. The upper end of the annular mesh is connected to the outlet end of the air inlet pipe, and the lower end is connected to the upper end of the conical channel.
[0015] The beneficial effects of the embodiments of the present invention are as follows: This invention constructs a complete recovery system consisting of "gravity coarse dust removal - pressure buffering and stabilization - bag filter fine dust removal - gas storage and pressure regulation". The pressure buffer component directly dissipates the instantaneous pressure of the gas within the gravity dust collector, solving the core problem of large pressure fluctuations in blast furnace gas and the vulnerability of downstream equipment to shocks. This system can continuously provide downstream pipelines and gas-using equipment with stable gas pressure, significantly improving the stability and safety of the equipment operation. The pre-gravity dust collector performs coarse separation of large dust particles, significantly reducing the dust removal load of the subsequent bag filter, extending the service life of the filter bags, and reducing equipment maintenance costs. The gas storage tank can buffer and regulate the pressure of purified gas, adapting to fluctuations in blast furnace gas production and changes in downstream gas load, effectively reducing gas venting, improving the recovery and utilization rate of blast furnace gas, and reducing energy waste and environmental pollution. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.
[0017] Figure 1 This is a schematic diagram of the structure of a blast furnace gas recovery device provided in an embodiment of the present invention; Figure 2 This is an embodiment of the present invention. Figure 1 A schematic diagram of the main structure of a medium gravity dust collector tank; Figure 3 This is an embodiment of the present invention. Figure 2 Schematic diagram of the AA section structure; In the diagram: 1-Gravity dust collector, 11-Inlet pipe, 12-Outlet pipe, 13-Dust discharge pipe, 14-Gas collection and discharge section, 15-Dust settling section, 16-Irrelevant collection and discharge section, 2-Pressure buffer assembly, 21-Guide pipe, 22-Pressure equalization connecting pipe, 3-Bag filter, 4-Gas storage tank, 5-Collector, 51-Conical channel, 6-Annular mesh, 8-Blast furnace, 9-Gas utilization pipeline network. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0019] 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, an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0020] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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.
[0021] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those illustrated or described herein.
[0022] To make the drawings concise and easy to understand, some drawings only show one of the components with the same structure or function, or only one of them is marked. In this article, "one" not only means "only one", but can also mean "more than one", and "several" includes "two" and "more than two".
[0023] Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus. It is understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. The embodiments of this application are described in detail below with reference to the accompanying drawings.
[0024] like Figures 1-3 As shown, it illustrates a blast furnace gas recovery device according to an embodiment of the present invention, including a vertically arranged gravity dust collector 1, a pressure buffer assembly 2, a bag filter 3, and a gas storage tank 4.
[0025] The gravity dust collector 1 is a vertical pressure-bearing sealed tank. An air inlet pipe 11 and an air outlet pipe 12 are fixed on the top of the tank. A conical dust collection hopper is located at the bottom of the tank. A dust discharge pipe 13 with a sealed ash discharge valve is welded to the bottom end of the conical dust collection hopper. The air inlet end of the air inlet pipe 11 is sealed and connected to the gas outlet at the top of the blast furnace 8 through a mating flange. The air outlet end of the air inlet pipe 11 passes through the top wall of the gravity dust collector 1 and extends vertically into the tank.
[0026] The pressure buffer assembly 2 is installed on the outer wall of the gravity dust collector 1. The pressure buffer assembly 2 has a pressure buffer chamber, which is directly connected to the inner cavity of the gravity dust collector 1 through a connecting hole opened on the side wall of the tank. It is used to resolve instantaneous pressure fluctuations of the gas in the tank in real time.
[0027] The bag filter 3 adopts a high-temperature resistant pulse bag filter, and its air inlet is sealed and connected to the air outlet pipe 12 at the top of the gravity dust collector 1 through a connecting pipe with a sealing flange; the gas storage tank 4 adopts a low-pressure wet gas holder, and its air inlet is sealed and connected to the clean gas outlet of the bag filter 3 through a pipe. The gas outlet of the gas storage tank 4 is connected to the downstream gas utilization pipeline 9 through a pressure regulating valve group.
[0028] The working process of this embodiment is as follows: Blast furnace gas produced by blast furnace 8 is sent into gravity dust collector 1 through inlet pipe 11. The dust-laden gas expands in the tank, and large dust particles settle under gravity and are finally discharged through bottom dust discharge pipe 13. During this process, pressure buffer component 2 receives the instantaneous pressure peak of the gas in the tank through its own pressure buffer chamber, eliminates pressure fluctuations, and avoids sudden rises and falls in pressure in the tank, so as to output gas with stable pressure for subsequent processes. After coarse dust removal and pressure stabilization, the gas is sent into bag filter 3 through outlet pipe 12 to complete the fine filtration of fine dust particles. The purified gas is sent into gas storage tank 4 for buffering and finally delivered stably to gas utilization pipeline 9 after pressure regulation, so as to realize the efficient recovery and utilization of blast furnace gas.
[0029] In this embodiment, a complete recovery system of "gravity coarse dust removal - pressure buffering and stabilization - bag filter fine dust removal - gas storage and pressure regulation" is constructed. The pressure buffer component 2 directly dissipates the instantaneous pressure of the gas in the gravity dust removal tank 1, solving the core problem of large pressure fluctuations in blast furnace gas and the vulnerability of downstream equipment to shocks from the source. It can continuously provide downstream pipelines and gas-using equipment with stable pressure gas, greatly improving the stability and safety of the device operation. The pre-gravity dust removal tank 1 completes the coarse separation of large dust particles, which can significantly reduce the dust removal load of the subsequent bag filter, extend the service life of the dust collector bags, and reduce equipment maintenance costs. The gas storage tank 4 can realize the buffering and pressure regulation of purified gas, adapt to the fluctuation of blast furnace gas output and the changes in downstream gas load, effectively reduce gas venting, improve the recovery and utilization rate of blast furnace gas, and reduce energy waste and environmental pollution.
[0030] Furthermore, refer to Figure 3 As shown, the pressure buffer assembly 2 includes a guide pipe 21, which is fixed to the outer wall of the gravity dust collector 1. The upper end of the guide pipe 21 is connected to the upper part of the inner cavity of the gravity dust collector 1 through an upper connecting hole, and the lower end of the guide pipe 21 is connected to the lower part of the inner cavity of the gravity dust collector 1 through a lower connecting hole. The upper connecting position of the guide pipe 21 is always located above the lower connecting position. The air outlet of the air inlet pipe 11 extends into the tank, and its vertical height is exactly within the range between the upper connecting position and the lower connecting position of the guide pipe 21.
[0031] The working process of this embodiment is as follows: When the dust-laden gas is injected into the tank from the outlet end of the inlet pipe 11, it will first cause the pressure in the lower part of the gravity dust removal tank 1 to rise rapidly, while the pressure in the upper part of the gravity dust removal tank 1 has a response lag. At this time, the high-pressure gas in the lower part of the gravity dust removal tank 1 can enter the guide pipe 21 through the lower connecting hole, flow upward along the guide pipe 21 and then be sent into the upper part of the gravity dust removal tank 1 through the upper connecting hole, quickly transferring the high pressure in the lower part to the upper part, so that the pressure in the upper and lower parts of the gravity dust removal tank 1 quickly tends to be uniform; conversely, if the pressure in the upper part of the gravity dust removal tank 1 is higher than that in the lower part, the gas in the upper part can be replenished downward through the guide pipe 21 to achieve bidirectional balance of pressure in the upper and lower parts of the gravity dust removal tank 1, fundamentally reducing the instantaneous pressure peak in the gravity dust removal tank 1.
[0032] In this embodiment, the pressure transmission channel between the upper and lower parts of the gravity dust collector tank 1 is opened through the double-connected guide pipe structure. This allows the pressure in the lower part, which rises first when gas is input, to be quickly transmitted to the upper part, eliminating the pressure difference and pressure response lag between the upper and lower parts of the gravity dust collector tank 1. This makes the overall pressure of the gravity dust collector tank 1 more uniform, significantly reducing the instantaneous pressure peak inside the tank and achieving the core pressure stabilization and buffering effect. The position design of the guide pipe is coordinated with the outlet end of the inlet pipe, which can directly receive the pressure impact brought by the high-speed airflow ejected from the inlet pipe. The impact kinetic energy is converted into pressure-balanced circulating airflow, avoiding the sudden increase in local pressure caused by the direct impact of high-speed airflow on the gravity dust collector tank 1, and extending the service life of the gravity dust collector tank 1. The passive pressure equalization structure can achieve automatic pressure equalization between the upper and lower parts of the gravity dust collector tank 1 without additional power components and control valve groups. The structure is simple and reliable, with no gas release loss.
[0033] Furthermore, multiple guide pipes 21 are evenly spaced along the circumference of the gravity dust collector 1. The multiple guide pipes 21 are all arranged in close contact with the outer wall of the gravity dust collector 1, and the upper and lower connecting holes of each guide pipe 21 are at the same horizontal height to ensure that the connection positions of each guide pipe are consistent. The pressure buffer assembly 2 also includes a pressure equalization connecting pipe 22. The two ends of the pressure equalization connecting pipe 22 are respectively sealed and welded to the middle of the pipe body of two adjacent guide pipes 21. Multiple pressure equalization connecting pipes 22 cooperate with multiple guide pipes 21 to form a ring pressure equalization network around the gravity dust collector 1.
[0034] The working process of this embodiment is as follows: the gas entering the gravity dust collector 1 through the inlet pipe 11 is prone to uneven pressure distribution at different positions around the gravity dust collector 1 due to airflow deviation, and the pressure in the guide pipes 21 at different positions around the circumference will also be different; at this time, the gas in the high-pressure side guide pipe can flow into the low-pressure side guide pipe quickly through the pressure equalization connecting pipe 22, so that the pressure of all guide pipes around the circumference quickly tends to be consistent, thereby driving the pressure field around the inner cavity of the gravity dust collector 1 to be fully balanced, and completely eliminating the problems of uneven circumferential pressure and airflow deviation.
[0035] In this embodiment, multiple circumferential guide pipes, in conjunction with the annular pressure equalization connecting pipe 22, form a global pressure equalization system. This effectively solves the problem of uneven distribution of gas input through the inlet pipe around the gravity dust collector 1, quickly equalizes the pressure difference between the guide pipes, and achieves uniform and stable circumferential pressure field in the gravity dust collector 1. This avoids the risk of uneven stress and equipment damage to the gravity dust collector 1 caused by sudden local pressure increases. The synchronous operation of multiple guide pipes significantly improves the pressure buffer capacity and response speed, adapting to larger pressure fluctuations in blast furnace gas and broadening the operating condition adaptability range of the device. The annular pressure equalization network enables multiple guide pipes to form a backup structure. When a single guide pipe becomes blocked, the remaining guide pipes can still achieve pressure transmission and buffering through the pressure equalization connecting pipe, significantly improving the reliability and service life of the device.
[0036] Furthermore, refer to Figure 3 As shown, the section of the air inlet pipe 11 inside the gravity dust collector 1 is an extension section. The inner diameter of the extension section gradually increases from the inlet end to the outlet end, forming a conical flared structure. The outlet end face of the extension section is horizontally set, facing the bottom of the gravity dust collector 1.
[0037] The working process of this embodiment is as follows: When the blast furnace gas enters the gravity dust removal tank 1 through the gas inlet pipe 11, it flows along the gradually expanding extension section. The flow cross-sectional area gradually increases, and the gas flow velocity decreases steadily as the cross-sectional area increases. It changes from a high-speed conveying gas flow to a low-speed expanding gas flow, which greatly reduces the instantaneous impact force when the gas is ejected. At the same time, it avoids the pressure surge and secondary dust re-entrainment caused by the high-speed gas flow directly impacting the bottom of the tank.
[0038] In this embodiment, a gradually expanding extension section with an increasing diameter from the inlet to the outlet is adopted, which can achieve a smooth and gradual reduction in the blast furnace gas flow velocity. This significantly weakens the instantaneous pressure impact force when the gas is ejected from the source, avoids a sudden increase in pressure inside the tank caused by high-speed gas flow, and assists the pressure buffer component in achieving a pressure stabilization effect. The gradually expanding structure allows the gas to diffuse evenly in the radial direction, avoiding concentrated gas flow and making the airflow distribution in the tank cross section more uniform. This reduces the generation of turbulence and eddies, creates a stable flow field environment for the gravity settling of dust, and improves the efficiency of coarse dust removal. The deceleration and pressure reduction can be achieved simply by optimizing the structure of the inlet pipe itself, without the need for additional flow guiding or deceleration components. The structure is simple, the manufacturing cost is low, and it does not cause additional loss of gas transport pressure, nor does it affect the normal gas transport efficiency.
[0039] Furthermore, a collector 5 is also provided inside the gravity dust collector tank 1. The collector 5 is fixed to the inner wall of the gravity dust collector tank 1 by a rod (there is an annular channel between the collector 5 and the inner wall of the gravity dust collector tank 1). The collector 5 is located directly below the outlet end of the air inlet pipe 11, and the central axis of the collector 5 is completely coincident with the central axis of the air inlet pipe 11. The inner cavity of the collector 5 is a through conical channel 51. The upper end of the conical channel 51 with a larger diameter faces the outlet end of the air inlet pipe 11, and the lower end of the conical channel 51 with a smaller diameter faces the dust discharge pipe 13 at the bottom of the tank.
[0040] The working process of this embodiment is as follows: the dust-laden gas, after being decelerated by the extension section of the inlet pipe 11, flows towards the bottom of the tank. The dust, debris and other particulate matter carried in the gas, under the action of inertia and gravity, impacts the inner wall of the conical channel 51. The inclined inner wall of the conical channel 51 provides a guiding surface for the particulate matter, causing the particulate matter to concentrate in the middle of the channel along the guiding surface. Under the influence of its own gravity and the initial velocity of the gas flow, it continues to accumulate towards the bottom of the gravity dust removal tank 1, and is finally discharged through the dust discharge pipe 13, thus achieving efficient separation of dust and gas.
[0041] In this embodiment, the inclined inner wall of the conical channel 51 provides a directional guiding surface for dust and impurities in the gas, allowing particles to concentrate and gather towards the center along the inner wall, significantly improving dust collection efficiency and preventing particles from scattering within the inner wall of the gravity dust collector 1, thus achieving directional conveying and centralized collection of dust. The conical channel 51 can rectify and regulate the dust-laden airflow, guiding it to flow directionally towards the bottom of the gravity dust collector 1, avoiding secondary dust re-entrainment caused by turbulent airflow, further enhancing the gravity settling effect and improving coarse dust removal efficiency. At the same time, it can effectively receive the dust-laden airflow ejected from the inlet pipe, preventing high-speed airflow from directly impacting the bottom of the gravity dust collector 1, reducing wear on the bottom of the gravity dust collector 1, and extending the service life of the gravity dust collector 1.
[0042] Furthermore, a vertical exhaust gap is reserved between the upper end face of the manifold 5 and the exhaust end face of the intake pipe 11, which forms an annular open venting channel between the exhaust end of the intake pipe 11 and the upper end of the manifold 5.
[0043] The working process of this embodiment is as follows: After the dust-laden gas is ejected from the outlet end of the inlet pipe 11, it first undergoes expansion and deceleration within the exhaust interval. A portion of the dust-laden gas flows vertically into the conical channel 51 of the collector 5 to guide and collect the dust. Another portion of the gas can freely escape to the gravity dust collector 1 through the annular escaping channel, avoiding the entire gas flow from concentrating and impacting the collector 5, significantly reducing the impact pressure of the gas flow on the collector 5, and reducing the turbulence formed by the impact and rebound of the gas flow.
[0044] In this embodiment, the exhaust gap reserved between the collector 5 and the outlet end of the inlet pipe 11 provides sufficient space for the ejected coal gas to escape, effectively diverting the airflow and preventing all the airflow from concentrating and impacting the collector, significantly reducing the impact pressure of the airflow on the collector, reducing wear on the collector, and extending its service life; the exhaust gap can realize the early expansion and deceleration of the coal gas, further weakening the instantaneous impact force of the coal gas, helping to reduce the instantaneous pressure in the gravity dust collector 1, while avoiding the rebound turbulence generated by the direct impact of the airflow on the collector, reducing the problem of secondary dust re-entrainment from the source; the open escape channel can ensure the smooth flow of airflow, avoid the blockage of the flow channel caused by the inlet pipe 11 and the collector 5 being too close, reduce the flow channel resistance of the equipment, and ensure the efficiency of coal gas transportation.
[0045] Furthermore, the inner diameter of the upper end of the tapered channel 51 with the larger diameter is greater than the inner diameter of the air outlet end of the air inlet pipe 11; the inner diameter of the lower end of the tapered channel 51 with the smaller diameter is smaller than the inner diameter of the air outlet end of the air inlet pipe 11.
[0046] The working process of this embodiment is as follows: the maximum radial diffusion range of the dust-laden gas ejected from the outlet end of the inlet pipe 11 is completely covered by the upper opening of the conical channel 51, ensuring that the dust and debris in the gas can contact the inner wall of the conical channel 51 to achieve full flow capture; at the same time, the constriction structure at the lower end of the conical channel 51 can further gather the dust and debris collected along the inner wall and guide them to the dust discharge pipe 13 at the bottom of the tank to achieve efficient centralized dust discharge.
[0047] In this embodiment, the upper diameter of the conical channel 51 is larger than the outlet diameter of the inlet pipe 11, which can fully receive all the dust-laden gas ejected from the inlet pipe 11, ensuring that all impurities and particles in the gas can fully act on the inner wall of the conical channel 51, with no dust escape and no dead corners in dust removal, greatly improving the dust collection rate. The constricted design of the lower diameter of the conical channel 51 is smaller than the outlet diameter of the inlet pipe, which can further concentrate and gather the particles that gather along the inner wall, enhance the guiding and gathering effect, and make the particles accurately gather towards the dust discharge pipe, improving the dust discharge efficiency. The size ratio of the upper and lower ends is perfectly adapted to the radial diffusion law of the dust-laden airflow, ensuring full flow collection while realizing the directional guidance of particles, taking into account both dust removal efficiency and smooth airflow.
[0048] Furthermore, the gravity dust collector 1 is divided into three integrally formed sections from top to bottom: an exhaust section 14, a dust settling section 15, and a debris collection and discharge section 16. The three sections are coaxially arranged and have smooth, interconnected inner cavities. The exhaust section 14 is a cylindrical section of equal diameter, and the main body of the inlet pipe 11 and the outlet pipe 12 are both located in the exhaust section 14. The dust settling section 15 is a conical cylindrical structure that is narrower at the top and wider at the bottom. The inner diameter gradually increases from the top to the bottom, and the flow cross-sectional area gradually increases. The outlet end of the inlet pipe 11 is located in the upper part of the inner cavity of the dust settling section 15, and the flow collector 5 is fixedly installed in the lower part of the inner cavity of the dust settling section 15.
[0049] The working process of this embodiment is as follows: After the dust-laden gas enters the dust settling section 15 from the outlet end of the inlet pipe 11, it flows downward along the dust settling section 15. As the flow cross-sectional area of the dust settling section 15 gradually increases, the gas flow rate continues to decrease, and the instantaneous pressure inside the tank decreases synchronously. At the same time, the dust particles that escape to the bottom of the tank will collide with the inwardly inclined inner wall of the dust settling section 15. After the collision, the kinetic energy of the particles is greatly reduced, and they quickly lose their suspension ability. Under the action of gravity, they are deposited in the collection and discharge section 16 and finally discharged through the dust discharge pipe 13.
[0050] In this embodiment, the dust-falling section 15, which is narrow at the top and wide at the bottom, allows for a gradual increase in the flow cross-sectional area, resulting in a steady reduction in the gas flow rate. This effectively weakens the instantaneous pressure of the gas, further enhancing the pressure stabilization effect of the device and providing a more stable gas source for subsequent processes. The inwardly inclined inner wall of the dust-falling section 15 allows dust particles that are scattered in all directions to collide, significantly reducing their kinetic energy and causing them to quickly lose their suspension ability and settle. This effectively solves the problem of scattered particles that are difficult to settle, greatly improving dust deposition efficiency. The three-section tank structure achieves functional zoning: the exhaust section 14 is responsible for the uniform input and output of airflow, the dust-falling section 15 is responsible for the core pressure reduction and dust settling, and the dust collection and discharge section 16 is responsible for the centralized collection and discharge of dust. The flow field planning is more reasonable, further improving the dust removal and pressure stabilization performance of the device.
[0051] Furthermore, the pressure equalization connecting pipe 22 is inclined, and one end of the pressure equalization connecting pipe 22 is higher than the other end. The inclination direction of all pressure equalization connecting pipes 22 is consistent along the circumference of the gravity dust removal tank 1.
[0052] The working process of this embodiment is as follows: During the process of achieving pressure equilibrium by the flow of gas in the pressure equalization connecting pipe 22, a small amount of dust particles carried in the gas flow will slide and accumulate along the inclined inner wall of the pipe to the lowest end under the action of gravity, and will not adhere to or accumulate on the inner wall of the pipe.
[0053] In this embodiment, the inclined pressure equalization connecting pipe 22 can use gravity to guide the dust particles in the pipe to gather towards the lower end, effectively avoiding the dust particles from remaining and accumulating in the pipe body, fundamentally solving the problem of easy dust accumulation and blockage in horizontal pipes, ensuring the long-term smooth flow of the pressure equalization connecting pipe 22, and stably realizing the core function of circumferential pressure equalization. Furthermore, an annular mesh 6 is also provided inside the gravity dust collector 1. The annular mesh 6 is made of high-temperature resistant 310S stainless steel woven mesh. The upper end of the annular mesh 6 is sealed and fixedly connected to the outlet end face of the air inlet pipe 11 through a fixed flange. The lower end of the annular mesh 6 is sealed and fixedly connected to the upper inlet end face of the conical channel 51 through a fixed flange, so that the annular mesh 6 forms a cylindrical filter channel, which completely covers the annular gap between the outlet end of the air inlet pipe 11 and the upper end of the collector 5.
[0054] The working process of this embodiment is as follows: After the dust-laden gas is ejected from the outlet end of the inlet pipe 11, it must first pass through the area enclosed by the annular mesh 6. Larger dust particles in the gas are intercepted by the annular mesh 6 and cannot escape outward from the annular gap between the inlet pipe 11 and the collector 5, thus achieving pre-filtration of dust. At the same time, the porous structure of the annular mesh 6 allows the airflow to pass smoothly without causing blockage of the flow channel due to filtration. It can also rectify the airflow, eliminate turbulence, and allow the airflow to enter the conical channel 51 smoothly.
[0055] In this embodiment, the annular mesh 6 completely seals the gap between the outlet of the inlet pipe 11 and the inlet of the conical channel 51, effectively intercepting dust particles and preventing dust from escaping outwards, further improving the coarse dust removal efficiency and reducing the amount of dust entering the subsequent bag filter. The porous woven mesh structure ensures smooth gas flow while achieving dust interception, preventing channel blockage and avoiding pressure loss and blockage risks caused by filter components, thus ensuring long-term stable operation of the device. The annular mesh 6 can rectify and regulate the ejected airflow, eliminating turbulence and swirl, allowing the airflow to enter the conical channel 51 smoothly and evenly, further enhancing the dust guiding and collecting effect of the conical channel 51, while reducing secondary dust re-entrainment caused by turbulence.
[0056] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A blast furnace gas recovery device, characterized in that, include: The gravity dust collector (1) is vertically arranged. The top of the gravity dust collector (1) is provided with an air inlet pipe (11) and an air outlet pipe (12). The bottom of the gravity dust collector (1) is provided with a dust discharge pipe (13). The air inlet pipe (11) is used to connect with the gas outlet of the blast furnace (8). The air outlet end of the air inlet pipe (11) extends into the gravity dust collector (1). A pressure buffer assembly (2) is disposed on the side wall of the gravity dust collector (1). The pressure buffer assembly (2) has a pressure buffer chamber, which is connected to the gravity dust collector (1). The bag filter (3) is connected to the air outlet pipe (12); The gas storage tank (4) is connected to the outlet of the bag filter (3). The gas storage tank (4) is used to store gas and its outlet is used to connect to the gas utilization pipeline (9).
2. The blast furnace gas recovery device according to claim 1, characterized in that, The pressure buffer assembly (2) includes: The upper and lower ends of the guide pipe (21) are connected to the gravity dust removal tank (1), and the air outlet of the air inlet pipe (11) is located between the upper and lower ends of the guide pipe (21).
3. The blast furnace gas recovery device according to claim 2, characterized in that, The guide pipes (21) are arranged in a plurality of intervals along the circumference of the gravity dust collection tank (1), and the pressure buffer assembly (21) further includes: The pressure equalization connecting pipe (22) is connected at both ends to the two adjacent guide pipes (21).
4. The blast furnace gas recovery device according to claim 1, characterized in that, The portion of the air inlet pipe (11) located inside the gravity dust collector (1) is an extension section, and the inner diameter of the extension section gradually increases from the inlet end to the outlet end.
5. A blast furnace gas recovery device according to claim 4, characterized in that, Also includes: A collector (5) is disposed inside the gravity dust collector (1). The collector (5) is located below the outlet end of the air inlet pipe (11). The collector (5) has a conical channel (51) whose diameter gradually decreases from top to bottom.
6. A blast furnace gas recovery device according to claim 5, characterized in that, There is an exhaust gap between the manifold (5) and the exhaust end of the intake pipe (11).
7. A blast furnace gas recovery device according to claim 5, characterized in that, The diameter of the upper end of the conical channel (51) is greater than the diameter of the air outlet end of the air inlet pipe (11), and the diameter of the lower end of the conical channel (51) is smaller than the diameter of the air outlet end of the air inlet pipe (11).
8. A blast furnace gas recovery device according to claim 5, characterized in that, The gravity dust collector (1) is divided into an exhaust section (14), a dust settling section (15), and a debris collection and discharge section (16) from top to bottom. The cross-sectional area of the dust settling section (15) gradually increases from the top to the bottom. The exhaust end of the air inlet pipe (11) is located in the dust settling section (15).
9. A blast furnace gas recovery device according to claim 3, characterized in that, The pressure equalization connecting pipe (22) is inclined, and one end of the pressure equalization connecting pipe (22) is higher than the other end.
10. A blast furnace gas recovery device according to claim 5, characterized in that, Also includes: An annular mesh (6) is installed inside the gravity dust collector (1). The upper end of the annular mesh (6) is connected to the outlet end of the air inlet pipe (11), and the lower end is connected to the upper end of the conical channel (51).