Automatic changing device for blast furnace equalizing pressure outside the furnace

Abstract

The utility model relates to blast furnace smelting equipment technical field, concretely relates to a blast furnace out -of -furnace pressure equalization automatic furnace changing device. Including gas holder and be used for the compressed air air supply of gas holder delivery, the gas holder is communicated with the hot blast furnace of parallel connection to the table through the air supply pipeline and the branch pipe on air supply pipeline, is equipped with the flow monitor on air supply pipeline, is equipped with the cold blast valve on the branch pipe corresponding connection with hot blast furnace, is equipped with the through pipeline and the pressure charging pipeline in parallel between branch pipe and air supply pipeline, is equipped with the first quick -acting valve on through pipeline, is equipped with the pressure charging valve on pressure charging pipeline, is equipped with the reducing pipe of the gas flow velocity between pressure charging valve and air supply pipeline, the pressure charging supplementary adjusting assembly between air supply pipeline and pressure charging pipeline. The utility model has realized the convenient switching of furnace changing mode, the efficient pressure charging and pressure equalization processing, the stable fusion of airflow and reliable supply, satisfies the fine production demand of large -scale blast furnace.

Description

Technical Field

[0001] This utility model relates to the technical field of blast furnace smelting equipment, specifically to an automatic furnace changing device for external pressure equalization in a blast furnace. Background Technology

[0002] In the blast furnace ironmaking process, the hot blast stove is a key piece of equipment for continuously supplying high-temperature hot blast to the blast furnace. During operation, the hot blast stove requires continuous furnace switching to maintain the continuity and stability of the hot blast supply. The operation of the hot blast stove includes a heat storage and combustion period and a heat release and blast supply period. A single hot blast stove cannot simultaneously store heat and supply blast; multiple stoves must be rotated to ensure the blast furnace continuously receives high-temperature hot blast.

[0003] Currently, pressure-pressurizing valves and pressure-equalizing valves are often installed on cold air ducts for undisturbed furnace replacement. However, this process takes a long time to build up pressure and extends the pressure equalization process, which reduces the furnace replacement efficiency of the hot blast stove and increases the energy consumption and production cost of the blast furnace.

[0004] In the prior art, patent document CN115786617B discloses a rapid and undisturbed furnace changing device, including: a flow monitor, a flow regulating valve, a first gas storage tank, and a multi-pressure gas supply assembly. During operation, it can provide stepped pressure equalization through the multi-pressure gas supply assembly, accelerating the pressure equalization speed, reducing pressure equalization time, reducing noise, and improving the efficiency of the hot blast stove. However, when passing through the gas supply assembly, the airflow from the gas supply assembly directly mixes with the airflow from the blower and enters the hot blast stove. This rigid mixing method easily induces airflow eddies and pressure fluctuations, which can easily lead to pressure fluctuations at the hot blast stove inlet. Utility Model Content

[0005] This invention provides an automatic furnace changing device for equalizing pressure outside the blast furnace, in order to solve the technical problem of pressure fluctuations that easily occur during efficient furnace changing in the prior art.

[0006] To solve the above problems, the present invention provides an automatic furnace changing device for external pressure equalization in a blast furnace, which adopts the following technical solution: It includes an air storage tank and an air source for supplying compressed air to the air storage tank. The air storage tank is connected to a hot air furnace in parallel with the opposite platform through an air supply pipeline and branch pipes on the air supply pipeline. The air supply pipeline is equipped with a flow monitor. The branch pipes connected to the hot air furnaces are equipped with cold air valves. A straight pipeline and a pressurization pipeline are connected in parallel between the branch pipes and the air supply pipeline. The straight pipeline is equipped with a first quick-cut valve. The pressurization pipeline is equipped with a pressurization valve. A variable diameter pipe for lifting air flow rate is provided between the pressurization valve and the air supply pipeline. A pressurization supplement adjustment component is provided between the air supply pipeline and the pressurization pipeline.

[0007] Furthermore, the diameter of the end of the reducer that is close to the air supply pipe is the same as the diameter of the air supply pipe and is DNb, and the diameter of the end of the reducer that is close to the pressurization valve is DNa, where b > a.

[0008] Furthermore, the pressurization and adjustment assembly includes an adjustment branch connected to the air supply duct and located between the flow monitor and the straight duct. The adjustment branch is equipped with an adjustment valve, and the other end of the adjustment branch is connected to a buffer tank. The buffer tank is connected to a reducing pipe.

[0009] Furthermore, the variable diameter pipe has a diagonal flow pipe on its side at the middle for communicating with the buffer tank.

[0010] Furthermore, the included angle between the diagonal flow tube and the variable diameter tube is 30°-60°.

[0011] Furthermore, the compressed air source includes the original redundant compressed air and air compressed by an independent air compressor.

[0012] Furthermore, the hot air furnace is equipped with a pressure gauge for monitoring the internal air pressure.

[0013] The beneficial effects of the automatic furnace changing device for external pressure equalization provided by this utility model are: This invention features parallel straight-through pipelines and pressurization pipelines, enabling easy and flexible switching between the original furnace replacement method and the pressure equalization and pressurization furnace replacement method to meet the needs of different operating conditions. Furthermore, the compressed air source combines the original redundant compressed air with compressed air from an independent air compressor, and is flexibly controlled through the main air source pipe and quick-cut valve, ensuring a stable air supply and improving the reliability of the unit's operation.

[0014] This invention creates a localized high-pressure zone before the pressurizing valve, effectively increasing the initial pressurization rate, shortening the pressure build-up and equalization time, and improving overall pressurization efficiency. Furthermore, an additional pressurization supplementation and adjustment component is added, allowing redundant airflow from the air supply pipeline to enter the buffer tank via the adjustment valve, achieving supplementary equalization and further improving equalization efficiency. Overall, the airflow fluctuation is small, meeting the requirements of refined production in large blast furnaces. Attached Figure Description

[0015] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein: Figure 1 This is a schematic diagram of the automatic furnace changing device for equalizing pressure outside the blast furnace according to this utility model. Figure 2 for Figure 1A magnified view of a portion of region A in the middle.

[0016] Explanation of reference numerals in the attached figures: 1. Gas storage tank; 11. Air supply pipeline; 12. Branch pipe; 2. Hot air furnace; 3. Flow monitor; 4. Cold air valve; 5. Straight-through pipeline; 51. First quick-cut valve; 6. Pressurization pipeline; 61. Pressurization valve; 62. Reducer; 621. Diagonal flow pipe; 7. Regulating branch; 71. Regulating valve; 8. Buffer tank. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0018] The number of any elements in the accompanying drawings is for illustrative purposes only and not as a limitation, and any naming is for distinction only and has no limiting meaning.

[0019] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0020] An embodiment of the automatic furnace changing device for external pressure equalization in a blast furnace provided by this utility model: like Figures 1 to 2 As shown, The system includes an air storage tank 1 and an air compressor source for supplying compressed air to the air storage tank 1. The air storage tank 1 is connected to the hot blast stove 2 connected in parallel to the opposite platform via an air supply pipeline 11 and branch pipes 12 on the air supply pipeline 11. A flow monitor 3 is installed on the air supply pipeline 11, and a cold air valve 4 is installed on the branch pipes 12 that are connected one-to-one with the hot blast stove 2. A straight-through pipeline 5 and a pressurization pipeline 6 are connected in parallel between the branch pipes 12 and the air supply pipeline 11. By setting up the parallel straight-through pipeline 5 and the pressurization pipeline 6, it is easy to switch between the original furnace replacement method and the pressure equalization and pressurization furnace replacement method.

[0021] The straight-through duct 5 is equipped with a first quick-cut valve 51. The flow monitor 3 on the air supply duct 11 is used to monitor the air volume of the air supply duct 11. When pressurization is not required, the first quick-cut valve 51 and the cold air valve 4 can be opened.

[0022] A pressurizing valve 61 is installed on the pressurizing pipeline 6, and a reducer 62 for increasing the airflow velocity is installed between the pressurizing valve 61 and the air supply pipeline 11. When the pressure inside the hot blast furnace 2 is low, the first quick-cut valve 51 is closed and the pressurizing valve 61 is opened. The diameter of the end of the reducer 62 closest to the air supply pipeline 11 is the same as the diameter of the air supply pipeline 11 and is DNb. The diameter of the end of the reducer 62 closest to the pressurizing valve 61 is DNa, where b > a. After the airflow passes through the reducer 62, the high-speed airflow flowing out from the converging end forms a local high-pressure zone before the pressurizing valve 61, effectively increasing the initial pressurization rate and shortening the pressure build-up time. The reducer 62 and the pressurizing valve 61 work together to shorten the pressure build-up time and reduce the pressure equalization time.

[0023] In this embodiment, there is a pressurization adjustment component between the air supply duct 11 and the pressurization duct 6.

[0024] The pressurization and adjustment component includes an adjustment branch 7 connected to the air supply duct 11 and located between the flow monitor 3 and the straight duct 5. The adjustment branch 7 is equipped with an adjustment valve 71. The other end of the adjustment branch 7 is connected to the buffer tank 8. The buffer tank 8 is connected to the reducer 62.

[0025] Specifically, the redundant air volume in the air supply duct 11 will enter the buffer tank 8 through the regulating valve 71. The buffer tank 8 will then be used to supplement the pressure equalization process, thereby further improving the efficiency of the pressure equalization process.

[0026] The variable diameter pipe 62 has a diagonal flow pipe 621 on the side of its middle section for communicating with the buffer tank 8.

[0027] The flow velocity changes significantly in the middle of the variable diameter pipe 62, i.e. the flow velocity increases. This has a certain ejecting effect on the supplementary airflow entering from the inclined flow pipe 621, making the airflow mix even before the variable diameter pipe 62, reducing airflow fluctuations, making the inlet pressure of the pressurization valve 61 more uniform, and thus improving the stability of the airflow entering the heat exchange circuit 2, meeting the refined production needs of large blast furnaces.

[0028] The angle between the diagonal flow tube 621 and the variable diameter tube 62 is 45°.

[0029] This angle design makes the airflow fusion smoother and more efficient, reducing the impact of airflow during fusion.

[0030] In this embodiment, the compressed air source includes the original redundant compressed air and the air compressed by an independent air compressor.

[0031] Specifically, the side of the air storage tank 1 is provided with a main air source pipe that connects to the compressed air source, and the main air source pipe is equipped with a quick-cut valve. The compressed air source delivery pipeline and the air compressor are connected in parallel to the main air source pipe, and quick-cut valves are provided on the pipelines used for connection.

[0032] Based on the above description in this specification, those skilled in the art will also understand that the following terms used, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0033] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. An automatic blast furnace pressure equalization and changing device, comprising a gas storage tank (1) and an air source for supplying compressed air to the gas storage tank (1), wherein the gas storage tank (1) is connected to a hot blast stove (2) connected in parallel to the gas storage tank (1) via an air supply pipeline (11) and branch pipes (12) on the air supply pipeline (11), wherein a flow monitor (3) is provided on the air supply pipeline (11), and a cold air valve (4) is provided on the branch pipes (12) that are connected one-to-one with the hot blast stove (2), characterized in that, A straight pipe (5) and a pressurizing pipe (6) are provided in parallel between the branch pipe (12) and the air supply pipe (11). A first quick-cut valve (51) is provided on the straight pipe (5), and a pressurizing valve (61) is provided on the pressurizing pipe (6). A variable diameter pipe (62) for lifting air flow rate is provided between the pressurizing valve (61) and the air supply pipe (11). A pressurizing supplement adjustment component is provided between the air supply pipe (11) and the pressurizing pipe (6).

2. The automatic furnace changing device for external pressure equalization in blast furnaces according to claim 1, characterized in that, The diameter of the end of the reducer (62) that is close to the air supply pipe (11) is the same as the diameter of the air supply pipe (11) and is DNb. The diameter of the end of the reducer (62) that is close to the pressurization valve (61) is DNa, where b>a.

3. The automatic furnace changing device for equalizing pressure outside the blast furnace according to claim 2, characterized in that, The pressurization and adjustment assembly includes an adjustment branch (7) connected to the air supply duct (11) and located between the flow monitor (3) and the straight duct (5). The adjustment branch (7) is equipped with an adjustment valve (71). The other end of the adjustment branch (7) is connected to the buffer tank (8). The buffer tank (8) is connected to the reducer (62).

4. The automatic furnace changing device for external pressure equalization in blast furnaces according to claim 3, characterized in that, The variable diameter pipe (62) has a diagonal flow pipe (621) on the side of its middle section for communicating with the buffer tank (8).

5. The automatic furnace changing device for external pressure equalization in blast furnaces according to claim 4, characterized in that, The angle between the diagonal flow tube (621) and the variable diameter tube (62) is 30°-60°.

6. The automatic furnace changing device for external pressure equalization in blast furnaces according to claim 1, characterized in that, The compressed air source includes the original redundant compressed air and air compressed by an independent air compressor.

7. The automatic furnace changing device for external pressure equalization in blast furnaces according to claim 1, characterized in that, The hot air furnace (2) is equipped with a pressure gauge for monitoring the internal air pressure.

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