Coal injection tank pressure relief nitrogen secondary utilization device

Abstract

The utility model discloses a secondary utilization device for pressure relief nitrogen of a coal injection tank, which belongs to the technical field of pressure relief of injection tanks and comprises a plurality of injection tanks arranged in a first furnace, a plurality of injection tanks arranged in a second furnace and a pressure relief nitrogen header pipe. The pressure relief nitrogen header pipe is respectively communicated with all the injection tanks in the first furnace and all the injection tanks in the second furnace through metal flexible connecting pipes; and a manual valve and a pneumatic valve are arranged at the joint of each injection tank and the metal flexible connecting pipe. According to the utility model, the nitrogen in the injection tank can be continuously and stably decompressed into other injection tanks, so that the nitrogen can be reused, the waste is avoided, and the phenomenon that the nitrogen is completely exhausted and wasted during coal injection pressure relief is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of pressure relief technology for pulverized coal injection tanks, and in particular to a device for secondary utilization of nitrogen gas for pressure relief in pulverized coal injection tanks. Background Technology

[0002] Currently, in the production process of the blast furnace smelting injection tank injection system in the metallurgical system, after all the coal is injected into the injection tanks, all the nitrogen in the tanks is completely emptied. Although the use of nitrogen is constantly controlled, and the pressure inside the tanks is required not to be overfilled, and only enough is needed to avoid waste, after each tank is filled with coal, it is necessary to start depressurizing to zero, and then refill with nitrogen after coal is added. Each repeated operation causes a large amount of nitrogen waste, which increases the production cost.

[0003] In view of this, and to address the above problems, this utility model provides a device for the secondary utilization of nitrogen gas from a pulverized coal injection tank. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a device for the secondary utilization of nitrogen gas in a pulverized coal injection tank, which can continuously and stably depressurize the nitrogen gas in the tank to other tanks for reuse, without emptying and wasting it.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A device for the secondary utilization of nitrogen gas from pulverized coal injection tanks includes several injection tanks installed in a No. 1 furnace, several injection tanks installed in a No. 2 furnace, and a main nitrogen gas depressurization pipe; the main nitrogen gas depressurization pipe is connected to all injection tanks in the No. 1 furnace and all injection tanks in the No. 2 furnace via flexible metal connecting pipes; a manual valve and a pneumatic valve are installed at the connection between each injection tank and the flexible metal connecting pipe.

[0007] A further improvement of the present invention is that the No. 1 furnace includes a first injection tank, a second injection tank, and a third injection tank; the first injection tank, the second injection tank, and the third injection tank are respectively connected to the main nitrogen relief pipe via metal flexible connecting pipes.

[0008] A further improvement of this utility model is that a manual valve and a pneumatic valve are provided at the connection points of the first, second, and third spray cans with the metal flexible connecting pipe.

[0009] A further improvement of the present invention is that the No. 2 furnace includes a fourth injection canister, a fifth injection canister, and a sixth injection canister; the fourth injection canister, the fifth injection canister, and the sixth injection canister are respectively connected to the main pressure relief nitrogen pipe through a metal flexible connecting pipe.

[0010] A further improvement of this utility model is that a manual valve and a pneumatic valve are provided at the connection points of the fourth, fifth, and sixth injection cans with the metal flexible connecting pipe.

[0011] The technological advancements achieved by this utility model due to the adoption of the above technical solution are as follows:

[0012] 1. This utility model connects all six injection tanks of two blast furnaces together, allowing the two blast furnaces to depressurize each other, maximizing the utilization of nitrogen in the injection tanks without wasting any nitrogen; it stabilizes the nitrogen pressure of pulverized coal injection, ensures uniform injection of nitrogen into the blast furnace, and ensures stable operation of the blast furnace.

[0013] 2. To prevent nitrogen from being directly depressurized into other spray tanks and causing excessive pressure leading to pipe rupture, this utility model has installed two valves, a manual valve and a pneumatic valve, at the connection between each spray tank and the metal flexible connecting pipe to ensure safe production.

[0014] 3. This utility model sets the connection pipe between each injection tank and the main nitrogen relief pipe as a flexible metal connection pipe, which ensures the accuracy of weighing of the injection tank during the pressure relief process and also ensures the safety of the pressure relief process.

[0015] 4. This utility model improves the process of the injection tank injection system in the blast furnace smelting of the metallurgical system. It is simple to operate, practical, easy to control, low in cost, safe and reliable. It solves the problem of nitrogen resource waste caused after injection and effectively reduces nitrogen emissions, thus reducing the pollution to the on-site environment caused by direct nitrogen emissions. Attached Figure Description

[0016] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a nitrogen secondary utilization device for depressurization of a pulverized coal injection tank provided in this embodiment of the utility model;

[0018] Among them, 1. No. 1 furnace; 1-1. First injection tank; 1-2. Second injection tank; 1-3. Third injection tank; 2. No. 1 furnace; 2-1. Fourth injection tank; 2-2. Fifth injection tank; 2-3. Sixth injection tank; 3. Depressurization nitrogen main pipe. Detailed Implementation

[0019] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this utility model are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0023] like Figure 1 As shown, a nitrogen secondary utilization device for pressure relief from pulverized coal injection tanks includes several injection tanks installed in Furnace No. 1, several injection tanks installed in Furnace No. 2, and a main nitrogen relief pipe 3. Furnace No. 1 includes a first injection tank 1-1, a second injection tank 1-2, and a third injection tank 1-3. The first injection tank 1-1, the second injection tank 1-2, and the third injection tank 1-3 are respectively connected to the main nitrogen relief pipe 3 via flexible metal connecting pipes. The use of flexible metal connecting pipes ensures the accuracy of weighing during the pressure relief process of the injection tanks and also ensures the safety of the pressure relief process.

[0024] At the connection points of the first injection tank 1-1, the second injection tank 1-2, and the third injection tank 1-3 with the metal flexible connecting pipes (each injection tank has its corresponding metal flexible connecting pipe, i.e., there are 3 metal flexible connecting pipes), a manual valve and a pneumatic valve are installed. This prevents nitrogen gas from directly leaking into other injection tanks, causing excessive pressure and potentially leading to pipe rupture. The manual valves also ensure manual control in case of pneumatic valve failure, further guaranteeing safety.

[0025] Furnace No. 2 includes a fourth injection tank 2-1, a fifth injection tank 2-2, and a sixth injection tank 2-3; the fourth injection tank 2-1, the fifth injection tank 2-2, and the sixth injection tank 2-3 are all connected to the main nitrogen relief pipe 3 via metal flexible connecting pipes.

[0026] At the connection points of the fourth injection tank 2-1, the fifth injection tank 2-2, and the sixth injection tank 2-3 with the metal flexible connecting pipe (each injection tank corresponds to its corresponding metal flexible connecting pipe, i.e., there are 3 metal flexible connecting pipes), a manual valve and a pneumatic valve are installed.

[0027] Specifically, such as Figure 1 As shown, a pipeline is installed at the top of each existing spray tank (first spray tank 1-1, second spray tank 1-2, third spray tank 1-3, fourth spray tank 2-1, fifth spray tank 2-2, and sixth spray tank 2-3) to release pressure to other spray tanks. For example, after the first spray tank 1-1, second spray tank 1-2, and third spray tank 1-3 have all finished spraying, there will still be 3-4 kg of nitrogen remaining in the spray tanks. At this time, the nitrogen in the first spray tank 1-1 can be released through a metal flexible connecting pipe and the pressure relief nitrogen main pipe 3 to the second spray tank 1-2, third spray tank 1-3, or other spray tanks. The nitrogen is then released according to the pressure gauge on each spray tank and the weighing device at the bottom of the tank until it is completely released. If it is impossible to release all the nitrogen, then the nitrogen is emptied. This process continues in the same manner.

[0028] In summary, this utility model connects all six injection tanks of two blast furnaces together, allowing the two blast furnaces to depressurize each other, maximizing the utilization of nitrogen in the injection tanks without wasting any nitrogen. It also eliminates the waste of large amounts of nitrogen released during injection tank depressurization, saving 8,000-10,000 cubic meters of nitrogen per day, effectively reducing production costs and minimizing resource waste.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for secondary utilization of nitrogen gas from a pulverized coal injection tank, characterized in that: It includes several injection tanks installed in the No. 1 furnace (1), several injection tanks installed in the No. 2 furnace (2), and a pressure relief nitrogen main pipe (3); the pressure relief nitrogen main pipe (3) is connected to all injection tanks in the No. 1 furnace (1) and all injection tanks in the No. 2 furnace (2) through metal flexible connecting pipes; a manual valve and a pneumatic valve are installed at the connection between each injection tank and the metal flexible connecting pipe.

2. The nitrogen secondary utilization device for pressure relief in a pulverized coal injection tank according to claim 1, characterized in that: The No. 1 furnace (1) includes a first injection tank (1-1), a second injection tank (1-2), and a third injection tank (1-3); the first injection tank (1-1), the second injection tank (1-2), and the third injection tank (1-3) are respectively connected to the main nitrogen relief pipe (3) through metal flexible connecting pipes.

3. The nitrogen secondary utilization device for pressure relief in a pulverized coal injection tank according to claim 2, characterized in that: A manual valve and a pneumatic valve are provided at the connection points between the first injection tank (1-1), the second injection tank (1-2), and the third injection tank (1-3) and the metal flexible connecting pipe.

4. The nitrogen secondary utilization device for pressure relief in a pulverized coal injection tank according to claim 1, characterized in that: The No. 2 furnace (2) includes a fourth injection tank (2-1), a fifth injection tank (2-2), and a sixth injection tank (2-3); the fourth injection tank (2-1), the fifth injection tank (2-2), and the sixth injection tank (2-3) are respectively connected to the main nitrogen relief pipe (3) through metal flexible connecting pipes.

5. The nitrogen secondary utilization device for pressure relief in a pulverized coal injection tank according to claim 4, characterized in that: A manual valve and a pneumatic valve are provided at the connection points between the fourth injection tank (2-1), the fifth injection tank (2-2), and the sixth injection tank (2-3) and the metal flexible connecting pipe.

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