Steel scrap pressing cake working cavity with injection orifice

Abstract

The invention discloses a steel scrap cake pressing working cavity with a jet orifice, and relates to the technical field of steel scrap cake pressing additive adding. The steel scrap pressing cake working cavity with the injection orifice comprises a pressing working cavity, the pressing working cavity is used for adding steel scraps and pressing the steel scraps into steel scrap pressing cakes, the pressing working cavity is communicated with one or more injection pipes, and the injection pipes are used for injecting additives to the steel scraps. According to the steel scrap cake pressing working cavity with the jet orifices, the mode that high-pressure gas conveys powder additives is utilized, and after steel scraps are added, the high-pressure gas with the powder additives can be jetted into the steel scraps through the jet orifices formed in the wall of the working cavity.

Description

Technical Field

[0001] The invention relates to the technical field of adding additives to steel chip pressed cakes, in particular to a steel chip pressed cake working chamber with an injection port. Background Art

[0002] When purchasing scrap steel for converters, steel mills are increasingly turning their attention to scrap steel cakes made of steel scraps, wood shavings, welding slag, particle steel and iron-containing slag in order to control costs. Some steel mills even add more than 20% of steel scraps or steel shavings cakes in the long process. Due to the heat balance of the converter and other reasons, it is difficult to further increase the scrap steel ratio.

[0003] In the electric furnace steelmaking process, for the sake of cost reduction, the scrap steel in the electric furnace is often composed of medium scrap and sheared materials. The reason is that the electric furnace mainly relies on electrodes to melt scrap steel, and heavy scrap steel takes a long time to melt and has a high cost. In addition, electric furnaces prefer high-carbon materials, and full-process steel mills will also add a certain proportion of molten iron to the electric furnace based on economic conditions. As the proportion of molten iron in steel mills decreases, the proportion of scrap steel in electric furnace smelting will further increase, which poses higher challenges to the heat and time requirements for melting the molten pool.

[0004] In order to increase the ratio of scrap steel in smelting, the previous method of adding carbon-based materials into the converter is to add powdered or granular carbon into the furnace by blowing or adding from a hopper. The method of adding carbon-based materials into the electric furnace is similar. The biggest advantage of this method is that it is easy to operate and has low cost. However, since the carbon-based materials are added in the form of bulk materials, part of the fuel directly floats to the surface of the molten steel and burns before it enters the molten pool or burns in the form of carburizing, thereby reducing the recovery rate of the carbon-based materials, and the contribution to the heat in the furnace is limited, resulting in a lot of waste.

[0005] Adding too much steel cake during the steelmaking process will not only lead to insufficient heat, but also cause a more violent oxidation reaction in the converter after adding more steel shavings cake, due to the fact that the cake contains more iron oxides, and even cause splashing and other problems that affect production and environmental protection, and also affect the metal recovery rate of the cake.

[0006] Existing technologies such as CN202311669832.8 disclose a fast-melting steel scrap or steel shavings cake and a method for producing the same, and propose a method of adding additives to steel scrap or steel shavings cake to improve the performance of steel scrap or steel shavings cake when smelting scrap steel.

[0007] Currently in the test stage, the additives required for individual steel chips or steel shavings cakes can be manually added to the pressing bin or follow the steel chips or steel shavings into the pressing bin, but in the actual production stage, there is no efficient adding method in the existing technology.

[0008] In addition, the additives are usually in powder form. However, if they are not fully mixed with steel chips or steel shavings during the addition process, the additive powder in the pressed steel chips or steel shavings cakes is not dispersed enough, which will reduce the performance of the subsequent scrap steel smelting. Summary of the invention

[0009] 1. Technical issues to be resolved

[0010] In view of the shortcomings of the prior art, the present invention provides a steel chip cake pressing working chamber with an injection port, which solves the following technical problems:

[0011] 1. The prior art lacks an automatic batch adding device for steel chip cakes with additives;

[0012] 2. The existing adding method does not mix the additives and steel chips sufficiently;

[0013] 3. The working chamber pressure of the steel chip cake press is relatively high, and the installation position of the injection port in the injection addition method needs to be determined.

[0014] (II) Technical solution

[0015] To achieve the above objectives, the present invention is implemented through the following technical scheme: a steel chip cake pressing working chamber with an injection port, comprising a pressing working chamber, the pressing working chamber is used to add steel chips and press the steel chips into steel chip cakes, the pressing working chamber is connected to a single or multiple injection pipes, and the injection pipes are used to spray additives into the steel chips.

[0016] Preferably, it comprises a feeding chamber, the feeding chamber is communicated with the pressing working chamber, and one or both of the feeding chamber and the pressing working chamber are connected with a detection port of a dust sensor.

[0017] Preferably, it comprises a feeding chamber, the feeding chamber is communicated with the pressing working chamber, and a gate valve is arranged on the feeding chamber.

[0018] Preferably, an upper pressing block is provided at the upper end of the inner side of the pressing working chamber, and a lower pressing block is provided at the lower end, the lower pressing block is connected to the bottom of the pressing working chamber, the top of the upper pressing block is connected to a hydraulic cylinder, and a side pressing block is provided on the side of the bottom of the pressing working chamber, the upper pressing block and the lower pressing block are used for pressing the steel chip press cake in the X-axis direction, and the side pressing block is used for pressing the steel chip press cake in the Z-axis direction.

[0019] Preferably, the installation height of the injection pipe is higher than the installation height of the side pressure block.

[0020] Preferably, the injection pipe uses high-pressure gas mixed with additives for injection.

[0021] (III) Beneficial effects

[0022] The present invention provides a steel chip cake pressing working chamber with an injection port, which has the following beneficial effects:

[0023] (1) The steel chip cake pressing working chamber with an injection port utilizes a high-pressure gas to convey powder additives, and after adding the steel chips, the high-pressure gas containing the powder additives can be injected into the steel chips through the injection port provided on the wall of the working chamber.

[0024] (2) The steel chip cake pressing working chamber with the injection port is connected to the dust detection device in the working chamber or the feeding chamber, which can effectively detect the dust concentration in the working chamber or the feeding chamber, and further realize the monitoring of the mixing degree of the powder additive and the steel chips.

[0025] (3) The steel chip cake pressing working chamber with an injection port sets the injection port in the low-pressure area of ​​the working chamber, thereby increasing the service life of the injection port and reducing the possibility of the injection port being blocked by steel chips. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention.

[0027] In the figure: 1. Feeding chamber; 2. Pressing working chamber; 3. Injection pipe; 4. Upper pressure block; 5. Hydraulic cylinder; 6. Lower pressure block; 7. Side pressure block; 8. Inspection port; 9. Gate valve. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1

[0030] A steel chip cake pressing working chamber with an injection port comprises a pressing working chamber 2 for adding steel chips and pressing the steel chips into steel chip cakes. The pressing working chamber 2 is connected with a single or multiple injection pipes 3 for injecting additives into the steel chips.

[0031] in:

[0032] It includes a feeding chamber 1, which is connected to a pressing working chamber 2. A gate valve 9 is provided on the feeding chamber 1. The gate valve 9 does not completely isolate the feeding chamber 1 from the outside world, and there will still be some gaps. In the case of not using a dust sensor, the additive can be sprayed after the gate valve 9 is closed. When additive dust leaks out of the gap of the gate valve 9, it indicates that the mixing of the additive and steel chips has been completed.

[0033] An upper pressing block 4 is provided at the upper end of the inner side of the pressing working chamber 2, and a lower pressing block 6 is provided at the lower end. The lower pressing block 6 is connected to the bottom of the pressing working chamber 2. A hydraulic cylinder 5 is connected to the top of the upper pressing block 4. A side pressing block 7 is provided on the side of the bottom of the pressing working chamber 2. The upper pressing block 4 and the lower pressing block 6 are used for pressing the steel chip pressed cake in the X-axis direction, and the side pressing block 7 is used for pressing the steel chip pressed cake in the Z-axis direction. The injection method of the injection pipe 3 adopts high-pressure gas mixed with additive injection.

[0034] In order to increase the service life of the injection port and prevent the injection port from being blocked by steel chips, the installation height of the injection pipe 3 is higher than the installation height of the side pressure block 7. In the specific pressing process, the side pressure block 7 is usually pressed on the Z axis after the upper pressure block 4 and the lower pressure block 6 are pressed together. After the upper pressure block 4 and the lower pressure block 6 are pressed together, the pressure of the steel chips is already high, so the pressing pressure of the side pressure block 7 is greater than the pressing pressure between the upper pressure block 4 and the lower pressure block 6. Therefore, the installation height of the injection pipe 3 is higher than the installation height of the side pressure block 7, which can prevent the injection pipe 3 from working in the high-pressure area for a long time, thereby increasing the service life and avoiding blockage. The specific time of improvement is related to the material selection and installation angle of the injection port 3. Generally speaking, it is more difficult to be blocked by steel chips if the installation angle is not directly facing the pressing direction, because the steel chips are usually crushed and the steel chips are soft. If there are steel chips stuck in the injection port, the steel chips stuck in the injection port will also be cut off during the pressing process. In addition, a small amount of steel chips stuck in the injection port can increase the turbulence of the injection airflow, thereby increasing the mixing degree of the additive and the steel chips.

[0035] Example 2

[0036] On the basis of Example 1, the feeding chamber 1 is connected to the pressing working chamber 2, and one or both of the feeding chamber 1 and the pressing working chamber 2 are connected with a detection port 8 of a dust sensor. The specific dust sensor can select a suitable dust sensor according to the characteristics of the components in the additive. The dust sensor is mainly used to detect the dispersion degree of the powder additive in the pressing working chamber 2 or the feeding chamber 1. A certain amount of powder additive is transported to the pressing working chamber 2 with high-pressure gas. If the flow rate and pressure of the high-pressure gas are appropriate, the powder additive can be effectively mixed with steel chips, and the dust sensor can also detect the corresponding dust parameters.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steel chip cake pressing working chamber with an injection port, comprising a pressing working chamber (2), wherein the pressing working chamber (2) is used to add steel chips and press the steel chips into steel chip cakes, characterized in that: The pressing working chamber (2) is connected to a single or multiple injection pipes (3), and the injection pipes (3) are used to inject additives onto steel chips.

2. The steel chip cake pressing working chamber with an injection port according to claim 1, characterized in that: It comprises a feeding chamber (1), wherein the feeding chamber (1) is communicated with a pressing working chamber (2), and one or both of the feeding chamber (1) and the pressing working chamber (2) are connected with a detection port (8) of a dust sensor.

3. The steel chip cake pressing working chamber with an injection port according to claim 1, characterized in that: It comprises a feeding chamber (1), the feeding chamber (1) being connected to a pressing working chamber (2), and a gate valve (9) being arranged on the feeding chamber (1).

4. The steel chip cake pressing working chamber with an injection port according to claim 1, characterized in that: An upper pressing block (4) is arranged at the upper end of the inner side of the pressing working chamber (2), and a lower pressing block (6) is arranged at the lower end; the lower pressing block (6) is connected to the bottom of the pressing working chamber (2); the top of the upper pressing block (4) is connected to a hydraulic cylinder (5); a side pressing block (7) is arranged on the side of the bottom of the pressing working chamber (2); the upper pressing block (4) and the lower pressing block (6) are used for pressing the steel chip press cake in the X-axis direction; and the side pressing block (7) is used for pressing the steel chip press cake in the Z-axis direction.

5. The steel chip cake pressing working chamber with an injection port according to claim 4, characterized in that: The installation height of the injection pipe (3) is higher than the installation height of the side pressure block (7).

6. The steel chip cake pressing working chamber with an injection port according to claim 1, characterized in that: The injection pipe (3) uses high-pressure gas mixed with additives for injection.

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