A high-pressure nitrogen sealing dust suppression device for adding iron in front of a converter and a converter

Abstract

The present invention provides a high-pressure nitrogen sealing dust suppression device for adding iron in front of a converter and a converter, which belongs to the field of converters, and includes an outlet pipe, which is horizontally installed above the fire curtain provided at the lower part of the secondary dust removal hood in the converter, and at least two rows of air nozzles are provided on the lower side of the outlet pipe along the length direction, and one end of the outlet pipe is connected to a nitrogen gas supply network through an air transmission pipeline. During the period of adding iron to the converter, the present invention can form a high-pressure air curtain on the outside of the secondary dust removal hood of the converter through the outlet pipe, and block the flue gas generated during the addition of iron in the inner layer of the secondary dust removal hood, so that the smoke cannot overflow, thereby improving the dust removal effect and increasing the speed of adding iron to the converter; at the same time, it can press the smoke downward as a whole, thereby avoiding the situation where part of the smoke escapes, and achieving a smoke capture rate of more than 95%.

Description

Technical Field

[0001] The invention belongs to the field of converters, and in particular relates to a converter front iron adding high pressure nitrogen sealing dust suppression device and a converter. Background Art

[0002] The converter is one of the core equipment in the steel smelting process, mainly used to convert molten iron into molten steel. At present, the operation of the converter is usually divided into three stages: blowing period, steel-making period and charging period. Specifically, during the blowing period, high-temperature and high-pressure oxygen is sprayed into the furnace through a spray gun, reacting violently with the molten iron, generating a large amount of heat and slag, and at the same time, the carbon content in the molten iron is greatly reduced until the carbon content requirement of the target steel grade is reached; after the blowing is completed, the molten steel in the furnace is poured into the ladle for the next step of refining or casting, which is called the steel-making period; and after steel-making, the converter will be reloaded with the next furnace of molten iron and necessary slag-making materials to prepare for the next round of smelting, which is the charging period.

[0003] Moreover, during the charging operation of the converter, when the operator adds scrap steel and molten iron into the furnace, smoke and dust are easily spilled due to the influence of the operator's skills and the speed of adding iron, thereby polluting the environment and threatening the health of the operator. At the same time, since the existing converters are all equipped with ADM dust online detection devices, when the ADM dust online detection device detects smoke and dust spillage, it is also easy to have a significant restriction on production efficiency.

[0004] In view of this, in order to increase the iron adding speed and reduce the smoke and dust overflow phenomenon, some converters began to be equipped with iron adding dust suppression devices to prevent the instantaneous smoke and dust overflow phenomenon caused by iron adding. For example, Chinese patent CN 212770816 U once provided a converter rapid iron adding dust suppression device. However, in actual deployment and operation, the device showed limitations: the blowpipes designed in it were placed on both sides of the secondary dust removal hood. This layout caused the smoke and dust located in the central area of ​​the dust collection hood to easily escape upward to the upper area of ​​the dust collection hood under the guidance of the purge airflow on both sides, thereby greatly reducing the capture efficiency of the entire dust removal system, and failing to comprehensively and effectively solve the smoke and dust overflow phenomenon. Summary of the invention

[0005] The purpose of the present invention is to propose and design a high-pressure nitrogen sealing dust suppression device and a converter for adding iron in front of the converter, in response to the problem that smoke and dust are prone to overflow during the loading process of the existing converter, so that the smoke generated during iron adding can be blocked in the inner layer of the secondary dust removal hood, thereby effectively preventing the smoke and dust overflow caused by improper operation, thereby effectively improving the production efficiency of the converter.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a high-pressure nitrogen sealing dust suppression device for adding iron in front of a converter, which includes an outlet pipe, which is horizontally installed above the fire curtain provided at the lower part of the secondary dust removal hood in the converter, and at least two rows of air nozzles are provided on the lower side of the outlet pipe along the length direction, and one end of the outlet pipe is connected to a nitrogen gas supply network through an air transmission pipeline. In this way, during the period of adding iron to the converter, the present invention can form a high-pressure air curtain on the outside of the secondary dust removal hood of the converter through the outlet pipe, and block the flue gas generated during the addition of iron in the inner layer of the secondary dust removal hood, so that the smoke and dust cannot overflow, thereby improving the dust removal effect and increasing the speed of adding iron to the converter. Moreover, compared with the dust suppression device for adding iron to the converter quickly described in the background technology, the structure of the present invention, which directly sets the outlet pipe above the fire curtain provided at the lower part of the secondary dust removal hood, can press the smoke downward as a whole, thereby avoiding the situation where part of the smoke escapes.

[0007] Furthermore, a flow control valve is provided on the gas transmission pipeline, and the flow rate of the nitrogen being transmitted is controlled by the flow control valve.

[0008] Furthermore, the flow control valve is a solenoid valve, and the flow control valve is electrically interlocked with the iron adding control module of the converter. At this time, the present invention can automatically open the entire high-pressure nitrogen sealing and dust suppression device during the iron adding of the converter through the electrical interlocking structure between the flow control valve and the iron adding control module, and form a high-pressure air curtain on the outside of the secondary dust removal hood of the converter.

[0009] Furthermore, the height of the high-pressure air curtain sprayed by the air nozzle at the air outlet pipe is 2 meters.

[0010] Furthermore, the outer side of the gas outlet pipe is coated with a refractory coating and protected by the refractory coating.

[0011] Further, the outer side of the gas nozzle is coated with a refractory coating and protected by the refractory coating.

[0012] Furthermore, any two rows of air nozzles are staggered to ensure uniformity of the injected high-pressure air curtain.

[0013] On the other hand, the present invention further provides a converter, comprising a converter body, wherein the converter body is provided with the above-mentioned converter front iron adding high-pressure nitrogen sealing and dust suppression device.

[0014] It can be seen from the above technical scheme that the present invention has the following advantages: during the iron adding period of the converter, the present invention can form a high-pressure air curtain on the outside of the secondary dust removal hood of the converter through the air outlet pipe, and block the flue gas generated during the iron adding in the inner layer of the secondary dust removal hood, so that the smoke and dust cannot overflow, thereby improving the dust removal effect and increasing the iron adding speed of the converter, and the interval time of iron adding in the converter can be increased from the original 90s to 60s; and compared with the dust suppression device for rapid iron adding of the converter described in the background technology, the structure of the present invention which directly arranges the air outlet pipe above the fire curtain arranged at the lower part of the secondary dust removal hood can press the smoke downward as a whole, thereby avoiding the situation where part of the smoke escapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of a specific implementation mode of the present invention.

[0017] In the figure: 1. converter body; 2. outlet pipe; 3. air nozzle; 4. secondary dust removal hood; 5. flow control valve; 6. nitrogen supply pipe network. DETAILED DESCRIPTION

[0018] 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.

[0019] Embodiment 1 like Figure 1 As shown, this embodiment 1 provides a high-pressure nitrogen sealing and dust suppression device for adding iron in front of a converter, which includes an outlet pipe 2, and the outlet pipe 2 is horizontally installed above the fire curtain arranged at the lower part of the secondary dust removal hood 4 in the converter, and at least two rows of air nozzles 3 are arranged on the lower side of the outlet pipe 2 along the length direction, one end of the outlet pipe 2 is connected to a nitrogen gas supply network 6 through an air supply pipeline, and a flow control valve 5 is arranged on the air supply pipeline, and the flow control valve 5 is a solenoid valve, and is electrically interlocked with the iron adding control module of the converter.

[0020] Thus, during the period of adding iron to the converter, the first embodiment can automatically open the entire high-pressure nitrogen sealing dust suppression device during the period of adding iron to the converter through the electrical interlocking structure between the flow control valve 5 and the iron adding control module, and form a 2-meter-high high-pressure air curtain on the outside of the converter secondary dust removal hood 4 through the outlet pipe 2, so as to block the flue gas generated during the iron adding in the inner layer of the secondary dust removal hood 4, so that the smoke and dust cannot overflow, thereby improving the dust removal effect and increasing the speed of adding iron to the converter. Moreover, compared with the converter rapid iron adding dust suppression device described in the background technology, the first embodiment of the present invention directly sets the outlet pipe 2 above the fire curtain set at the bottom of the secondary dust removal hood 4, which can press the flue gas downward as a whole, thereby avoiding the situation where part of the flue gas escapes, and achieving a flue gas capture rate of more than 95%.

[0021] Embodiment 2 The second embodiment provides a converter, including a converter body 1, wherein the converter body 1 is provided with the above-mentioned converter front iron adding high-pressure nitrogen sealing and dust suppression device.

[0022] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, 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 "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0023] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-pressure nitrogen sealing dust suppression device for adding iron in front of a converter, comprising an outlet pipe; characterized in that: The outlet pipe is horizontally installed above the fire curtain arranged at the lower part of the secondary dust removal hood in the converter, and at least two rows of air nozzles are arranged on the lower side of the outlet pipe along the length direction. One end of the outlet pipe is connected to the nitrogen supply network through the gas transmission pipeline.

2. The converter front iron adding high pressure nitrogen sealing dust suppression device according to claim 1, characterized in that: A flow control valve is provided on the gas transmission pipeline.

3. The converter front iron adding high pressure nitrogen sealing dust suppression device according to claim 2, characterized in that: The flow control valve is a solenoid valve, and the flow control valve is electrically interlocked with the iron addition control module of the converter.

4. The converter front iron adding high pressure nitrogen sealing dust suppression device according to claim 1, characterized in that: The height of the high-pressure air curtain sprayed by the jet nozzle at the outlet pipe is 2 meters.

5. The converter front iron adding high pressure nitrogen sealing dust suppression device according to claim 1, characterized in that: The outside of the gas outlet pipe is coated with a fire-resistant coating.

6. The converter front iron adding high pressure nitrogen sealing dust suppression device according to claim 1, characterized in that: The outside of the gas nozzle is coated with a refractory coating.

7. The converter front iron adding high pressure nitrogen sealing dust suppression device according to claim 1, characterized in that: The air jets in any two rows are staggered.

8. A converter, comprising a converter body, characterized in that: The converter body is provided with a converter front iron adding high pressure nitrogen sealing dust suppression device according to any one of claims 1-7.

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