Method for reducing nitrogen consumption of converter

Abstract

The invention discloses a method for reducing the nitrogen consumption of a converter. The method comprises the following steps: setting a target height value of an oxygen lance of a blanking system; acquiring an actual height value of an oxygen lance of the blanking system; comparing the actual height value of the oxygen lance of the blanking system with the target height value of the oxygen lance of the blanking system; if the actual height value of the oxygen lance of the blanking system is smaller than the target height value of the oxygen lance of the blanking system, a nitrogen seal of the blanking system is automatically opened; and if the actual height value of the oxygen lance of the blanking system is larger than the target height value of the oxygen lance of the blanking system, the nitrogen seal of the blanking system is automatically closed. Setting the delayed closing time of a nitrogen seal of the blanking system; and when the delayed closing time of the nitrogen seal of the blanking system is up, the nitrogen seal of the blanking system is closed. According to the method, the nitrogen seal of the blanking system is optimized and adjusted, and the gun position height of the nitrogen seal of the blanking system and the delayed closing time can be adjusted and controlled according to actual conditions, so that the control process is adjustable, and the field process control requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of iron and steel metallurgy, and particularly to a method for reducing the nitrogen consumption of a converter. Background Art

[0002] In the original design of the feeding system and the oxygen lance nozzle during the smelting process of the converter, low-pressure nitrogen seals are used. The low-pressure nitrogen seal is automatically switched on and off according to the height of the oxygen lance. When the height of the oxygen lance is less than 15 meters, the low-pressure nitrogen seal is automatically opened, and when it is greater than 15 meters, it is automatically closed to prevent the hot gas flow in the furnace from rising during the smelting process and causing damage to the electrical control equipment circuit of the feeding system and the slag scraper equipment at the oxygen lance nozzle. However, this technology has the following deficiencies:

[0003] 1. The nitrogen seal can only be automatically switched on and off according to the lance position and cannot be switched on and off on-site according to the actual situation.

[0004] 2. According to the statistics of the nitrogen consumption of the nitrogen seal in the feeding system and the nitrogen seal at the oxygen lance nozzle, the nitrogen seal flow rate used at the oxygen lance nozzle is about 2000 m 3 / H, and the low-pressure nitrogen seal flow rate of the feeding system is about 3000 m 3 / H. The feeding system must use inert gas to prevent the hot gas flow from rising, but the nitrogen seal at the oxygen lance nozzle is only used to suppress the gas flow, so the use of the nitrogen seal causes cost waste. Summary of the Invention

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a method for reducing the nitrogen consumption of a converter.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a method for reducing the nitrogen consumption of a converter, including:

[0007] Setting a target height value for the oxygen lance of the feeding system;

[0008] Obtaining the actual height value of the oxygen lance of the feeding system;

[0009] Comparing the actual height value of the oxygen lance of the feeding system with the target height value of the oxygen lance of the feeding system; if the actual height value of the oxygen lance of the feeding system is less than the target height value of the oxygen lance of the feeding system, the nitrogen seal of the feeding system is automatically opened; if the actual height value of the oxygen lance of the feeding system is greater than the target height value of the oxygen lance of the feeding system, the nitrogen seal of the feeding system is automatically closed.

[0010] As a further improvement of the present invention: the method further includes:

[0011] Setting a delay closing time for the nitrogen seal of the feeding system;

[0012] When the delay closing time of the nitrogen seal of the feeding system is reached, the nitrogen seal of the feeding system is closed.

[0013] As a further improvement of the present invention: the delay shutdown time can be 10 seconds, 20 seconds, or can be arbitrarily set by the user.

[0014] As a further improvement of the present invention: the target height value of the oxygen lance in the blanking system is 13.5 m; when the height of the oxygen lance in the blanking system is less than 13.5 m, the nitrogen seal of the blanking system automatically opens, and when it is greater than 13.5 m, it automatically closes to prevent the hot gas flow in the furnace from rising during smelting, causing damage to the electrical control equipment circuit of the blanking system and the slag scraper equipment at the oxygen lance nozzle.

[0015] As a further improvement of the present invention: the method further includes:

[0016] An oxygen lance nozzle nitrogen seal and an oxygen lance nozzle steam seal are provided at the oxygen lance nozzle;

[0017] Set the target content value of component Si in the molten iron;

[0018] Obtain the actual content value of component Si in the molten iron;

[0019] Compare the actual content value of component Si in the molten iron with the target content value of component Si in the molten iron; if the actual content value of component Si in the molten iron is less than the target content value of component Si in the molten iron, then turn on the oxygen lance nozzle steam seal; if the actual content value of component Si in the molten iron is greater than the target content value of component Si in the molten iron, then turn on the oxygen lance nozzle nitrogen seal.

[0020] As a further improvement of the present invention: the method uses a control system to control the reduction of the nitrogen consumption of the converter. The control system includes a control panel, and the control panel is provided with a delay shutdown time setting unit and a delay shutdown switch button.

[0021] As a further improvement of the present invention: the control panel is further provided with a 10-second delay button and a 20-second delay button.

[0022] As a further improvement of the present invention: the control panel is electrically connected to the upper computer, and the upper computer is connected to the nitrogen seal of the blanking system. The upper computer is used to realize the adjustment control of the nitrogen seal time of the blanking system.

[0023] As a further improvement of the present invention: the upper computer is respectively connected to the nitrogen seal of the oxygen lance nozzle and the steam seal of the oxygen lance nozzle. The upper computer is used to realize the switching of the nitrogen seal of the oxygen lance nozzle and the steam seal of the oxygen lance nozzle.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. By optimizing and adjusting the nitrogen seal of the blanking system, the present invention can control the gun position height and the delay shutdown time adjustment of the nitrogen seal of the blanking system according to the actual situation, so as to realize the adjustable control process and meet the on-site process control requirements.

[0026] 2. The present invention adds a steam seal to the oxygen lance nozzle on the basis of the nitrogen seal of the oxygen lance nozzle, and controls the selection according to the Si component of the hot metal, greatly reducing the consumption of low-pressure nitrogen and achieving cost reduction and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0030] Please refer to Figure 1 , a method for reducing the nitrogen consumption of a converter, comprising:

[0031] Setting a target height value for the oxygen lance of the feeding system;

[0032] Obtaining the actual height value of the oxygen lance of the feeding system;

[0033] Comparing the actual height value of the oxygen lance of the feeding system with the target height value of the oxygen lance of the feeding system; if the actual height value of the oxygen lance of the feeding system is less than the target height value of the oxygen lance of the feeding system, the nitrogen seal of the feeding system is automatically opened; if the actual height value of the oxygen lance of the feeding system is greater than the target height value of the oxygen lance of the feeding system, the nitrogen seal of the feeding system is automatically closed;

[0034] Setting a delay closing time for the nitrogen seal of the feeding system;

[0035] When the delay closing time of the nitrogen seal of the blanking system reaches, the nitrogen seal of the blanking system closes.

[0036] In an optional embodiment, the delay closing time can be 10 seconds, 20 seconds, or can be arbitrarily set by the user.

[0037] In an optional embodiment, the target height value of the oxygen lance of the blanking system is 13.5m; when the height of the oxygen lance of the blanking system is less than 13.5m, the nitrogen seal of the blanking system automatically opens, and when it is greater than 13.5m, it automatically closes to prevent the hot gas flow in the furnace from rising during smelting, causing damage to the electrical control equipment circuit of the blanking system and the slag scraper equipment at the oxygen lance port.

[0038] Further, the method further includes:

[0039] An oxygen lance port nitrogen seal and an oxygen lance port steam seal are provided at the oxygen lance port;

[0040] Set the target content value of component Si in the molten iron;

[0041] Obtain the actual content value of component Si in the molten iron;

[0042] Compare the actual content value of component Si in the molten iron with the target content value of component Si in the molten iron; if the actual content value of component Si in the molten iron is less than the target content value of component Si in the molten iron, then turn on the oxygen lance port steam seal; if the actual content value of component Si in the molten iron is greater than the target content value of component Si in the molten iron, then turn on the oxygen lance port nitrogen seal.

[0043] Select to use nitrogen seal or steam seal according to the content of component si in the molten iron.

[0044] Further, the method uses a control system to control the reduction of the nitrogen consumption of the converter. The control system includes a control panel, and the control panel is provided with a delay closing time setting unit and a delay closing switch button.

[0045] Further, the control panel is also provided with a 10-second delay button and a 20-second delay button.

[0046] Further, the control panel is electrically connected to the upper computer, and the upper computer is connected to the nitrogen seal of the blanking system. The time adjustment control of the nitrogen seal of the blanking system is realized through the upper computer.

[0047] Further, the upper computer is respectively connected to the oxygen lance port nitrogen seal and the oxygen lance port steam seal. The switching of the oxygen lance port nitrogen seal and the oxygen lance port steam seal is realized through the upper computer.

[0048] This technology belongs to the control technology of nitrogen sealing for the feeding system and nitrogen sealing for the oxygen lance nozzle in the converter steelmaking process. It optimizes and adjusts the nitrogen sealing of the feeding system to achieve the control of the gun position height and the adjustment control of the delay closing time of the nitrogen sealing in the feeding system, enabling adjustable control during the process. At the same time, a steam seal is newly added to the oxygen lance nozzle to achieve one-key switching between the nitrogen seal and the steam seal of the oxygen lance nozzle, thereby achieving the purpose of flexibly adjusting the nitrogen seal and saving nitrogen consumption.

[0049] The main functions of the present invention:

[0050] By optimizing and adjusting the nitrogen seal of the feeding system, the present invention can control the gun position height and adjust the delay closing time of the nitrogen seal in the feeding system according to actual conditions, thereby enabling adjustable control during the process and meeting the on-site process control requirements. By newly adding a steam seal to the oxygen lance nozzle on the basis of the nitrogen seal of the oxygen lance nozzle and selecting control according to the iron water si composition, the consumption of low-pressure nitrogen is greatly reduced, achieving cost reduction and efficiency improvement.

[0051] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored on or transmitted via a computer-readable medium as one or more instructions or codes. Other examples and embodiments are within the scope and spirit of the present invention and the appended claims. For example, due to the nature of software, the functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination of these. In addition, each functional unit can be integrated in one processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0052] The units described as separate components may or may not be physically separated. The components serving as control devices may or may not be physical units, that is, they can be located in one place or distributed to multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and the description of the present invention.

Claims

1. A method for reducing the nitrogen consumption in a converter, characterized in that: Including: Setting the target height value of the oxygen lance in the blanking system; Obtaining the actual height value of the oxygen lance in the blanking system; Comparing the actual height value of the oxygen lance in the blanking system with the target height value of the oxygen lance in the blanking system; if the actual height value of the oxygen lance in the blanking system is less than the target height value of the oxygen lance in the blanking system, the nitrogen seal of the blanking system will be automatically opened; if the actual height value of the oxygen lance in the blanking system is greater than the target height value of the oxygen lance in the blanking system, the nitrogen seal of the blanking system will be automatically closed.

2. The method for reducing the nitrogen consumption of a converter according to claim 1, characterized in that: The method further includes: Setting the delay closing time of the nitrogen seal of the blanking system; When the delay closing time of the nitrogen seal of the blanking system is reached, the nitrogen seal of the blanking system will be closed.

3. A method for reducing the nitrogen consumption of a converter according to claim 1, characterized in that: The target height value of the oxygen lance in the blanking system is 13.5 m.

4. A method for reducing the nitrogen consumption of a converter according to claim 1 or 2, characterized in that: The method further includes: An oxygen nozzle nitrogen seal and an oxygen nozzle steam seal are provided at the oxygen nozzle; Setting the target content value of component Si in the molten iron; Obtaining the actual content value of component Si in the molten iron; Comparing the actual content value of component Si in the molten iron with the target content value of component Si in the molten iron; if the actual content value of component Si in the molten iron is less than the target content value of component Si in the molten iron, the oxygen nozzle steam seal will be opened; if the actual content value of component Si in the molten iron is greater than the target content value of component Si in the molten iron, the oxygen nozzle nitrogen seal will be opened.

5. A method for reducing the nitrogen consumption of a converter according to claim 4, characterized in that: The method controls the reduction of the nitrogen consumption in the converter by using a control system. The control system includes a control panel, and the control panel is provided with a delay closing time setting unit and a delay closing switch button.

6. A method for reducing the nitrogen consumption of a converter according to claim 5, characterized in that: The control panel is further provided with a 10-second delay button and a 20-second delay button.

7. A method for reducing the nitrogen consumption of a converter according to claim 6, characterized in that: The control panel is electrically connected to the upper computer, and the upper computer is connected to the nitrogen seal of the blanking system.

8. A method for reducing the nitrogen consumption of a converter according to claim 7, characterized in that: The upper computer is respectively connected to the oxygen nozzle nitrogen seal and the oxygen nozzle steam seal.

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