Blast furnace front enriched oxygen consumption automatic adjusting pipeline

Abstract

The utility model belongs to the technical field of blast furnace oxygen supply pipelines, and relates to a blast furnace front enriched oxygen consumption automatic adjusting pipeline which comprises an oxygen pipeline, a manual valve is arranged at the head end of the oxygen pipeline, a filter is arranged on the oxygen pipeline, an electromagnetic valve and a pneumatic valve are arranged on the rear side of the filter on the oxygen pipeline, and the oxygen pipeline is connected to an oxygen mixer. The head end of the input pipeline is provided with an air filter, and the tail end of the input pipeline is connected with an axial flow fan. According to the utility model, the amount of enriched oxygen in front of a machine can be quickly and accurately adjusted, the redundant design is adopted in structure, automatic adjustment is realized, the manual mode of the pneumatic valve can be switched, and the continuous operation of an oxygen supply system is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to blast furnace oxygen supply pipeline technical field, concretely relates to a blast furnace machine front oxygen enrichment quantity automatic regulation pipeline. BACKGROUND

[0002] Blast furnace smelting is one of the core processes of modern steel production, and the blast oxygen enrichment technology as an important means to improve the blast furnace combustion efficiency and reduce the coke ratio has important significance for the stable operation and energy saving and emission reduction of blast furnace. However, with the continuous improvement of the smelting efficiency requirement of the steel industry on blast furnace, the traditional blast furnace machine front oxygen enrichment system gradually exposes the following defects:

[0003] The traditional oxygen enrichment system adopts single-stage or double-stage filter structure, and the filtering precision is limited, so that the micron-level impurities (such as iron rust, welding slag, etc.) in the oxygen can not be effectively removed, which not only blocks the pipeline and the mixer, but also causes the oxygen concentration to fluctuate, affects the stability of the blast furnace heat system, increases the fuel consumption, and relies on a single pneumatic regulating valve for oxygen flow control, the response time is usually more than 2 seconds, which can not meet the demand of the instantaneous working condition change of the blast furnace. When the furnace condition fluctuates, the proportion of oxygen and air is out of balance, which causes the fuel ratio to rise by 3-5%, directly affecting the smelting efficiency and economy of the blast furnace.

[0004] With the continuous improvement of the smelting efficiency, energy consumption and environmental protection requirements of the steel industry on blast furnace, it has become an urgent need of the industry to develop an oxygen enrichment system pipeline that can realize oxygen purity control, rapid dynamic adjustment, efficient mixing and high reliability. Especially under the background of intelligent smelting and green manufacturing, the blast furnace oxygen enrichment system needs to have higher automation level and lower operation energy consumption. INVENTION CONTENTS

[0005] The utility model aims at providing a blast furnace machine front oxygen enrichment quantity automatic regulation pipeline, which has the functions of blast furnace machine front oxygen enrichment filtration and quantity adjustment, and solves the problems of limited filtering precision and flow control that can not meet the demand of instantaneous working condition change of the blast furnace in the prior art.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme that the utility model provides a blast furnace machine front oxygen enrichment quantity automatic regulation pipeline, which comprises an oxygen pipeline, a manual valve is arranged at the first end of the oxygen pipeline, a filter is arranged on the oxygen pipeline, an electromagnetic valve and a pneumatic valve are arranged on the rear side of the filter on the oxygen pipeline, the oxygen pipeline is connected to an oxygen mixer, the oxygen mixer is arranged on an input pipeline, an air filter is arranged at the first end of the input pipeline, and an axial flow fan is connected at the end of the input pipeline.

[0007] As a preferred, the filter is a multi-layer sintered metal filter screen.

[0008] As a preferred, the oxygen mixer is provided with a built-in honeycomb ceramic fiber filter layer filter screen.

[0009] Preferably, the air filter is a stainless steel folded filter core.

[0010] Preferably, the filter, the oxygen mixer and the air filter all adopt a 316L stainless steel shell with a pressure resistance of 4 MPa.

[0011] Preferably, the oxygen mixer is a ring-shaped gradually expanding structure.

[0012] Preferably, the electromagnetic valve is a direct-acting high-frequency response valve, the valve body is made of forged aluminum alloy ZL205A; the pneumatic valve is an angular stroke butterfly valve, the valve body is made of bidirectional stainless steel 2205; the manual valve is a high-pressure resistant stop valve, the valve body is integrally forged SA-105 carbon steel, and the electromagnetic valve, the pneumatic valve and the manual valve are all installed through flanges.

[0013] Compared with the prior art, the utility model has the advantages and positive effects that,

[0014] 1. The utility model can quickly and accurately adjust the oxygen enrichment amount in front of the machine, adopts redundancy design on the structure, has automatic adjustment and can switch the manual mode of the pneumatic valve, and ensures uninterrupted operation of the oxygen supply system.

[0015] 2. The utility model has the functions of blast furnace front oxygen enrichment filtering and amount adjustment, solves the problems of limited filtering precision and flow control unable to meet the demand of instantaneous working condition change of the blast furnace in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can also be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is a kind of blast furnace front oxygen enrichment amount automatic adjustment pipeline structure diagram;

[0018] In the above figure, 1, oxygen pipeline, 2, manual valve, 3, filter, 4, electromagnetic valve, 5, pneumatic valve, 6, oxygen mixer, 7, input pipeline, 8, air filter, 9, axial flow fan. DETAILED DESCRIPTION

[0019] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can also be obtained by those skilled in the art without creative labor.

[0020] Many specific details are set forth in the following description in order to provide a thorough understanding of the present application. However, the present application can be practiced according to other embodiments that can not be described in detail herein, and the present application is not limited to the specific embodiments described herein.

[0021] Embodiment 1, as shown in a kind of blast furnace front oxygen-enriched dosage automatic regulating pipeline, including oxygen pipeline 1, oxygen pipeline 1 as the main channel of oxygen delivery, high-pressure oxygen is transported from oxygen supply source to oxygen mixer 6, provides stable oxygen-enriched gas for blast furnace, uses high-pressure resistant design, ensure that pipeline is stable under the pressure of 4MPa or more Run, avoid unstable oxygen delivery due to pressure fluctuation. Figure 1

[0022] The first end of the oxygen pipeline 1 is provided with a manual valve 2, which is used to manually open or close the oxygen delivery as a safety control device in system maintenance or emergency. A filter 3 is provided on the oxygen pipeline 1, which filters impurities (such as rust, welding slag, etc.) in the oxygen to prevent impurities from entering the subsequent pipeline and the oxygen mixer 6, ensuring the purity of the oxygen.

[0023] An electromagnetic valve 4 and a pneumatic valve 5 are provided on the downstream side of the filter 3 on the oxygen pipeline 1. The electromagnetic valve 4 is a rapid regulating device for oxygen flow, which realizes millisecond-level dynamic regulation of oxygen flow through a high-frequency response direct-acting structure. The pneumatic valve 5 is a backup regulating device for oxygen flow, which automatically switches to manual mode when the electromagnetic valve 4 fails, ensuring uninterrupted operation of the oxygen supply system.

[0024] The oxygen pipeline 1 is connected to the oxygen mixer 6, which uniformly mixes oxygen and air to ensure uniform distribution of oxygen concentration in the blast furnace blast, improving combustion efficiency. The oxygen mixer 6 is provided on the input pipeline 7, which serves as an air delivery channel to deliver air filtered by the air filter 8 to the oxygen mixer 6. The input pipeline 7 is provided with an air filter 8 at the first end, which preliminarily filters the input air to remove dust and particulate matter in the air, ensuring air cleanliness. The downstream end is connected to an axial flow fan 9, which provides power for the blast furnace blast to deliver the mixed oxygen-enriched gas to the blast furnace tuyere.

[0025] The specific design of the above key components will be described below:

[0026] The filter 3 is a multi-layer sintered metal filter screen. The filter screen is made of 316L stainless steel powder sintered at high temperature, forming uniform microporous channels. The filter screen has 3-5 layers, and the pore size decreases gradually in each layer, achieving fractional filtration and effectively removing micron-sized impurities such as rust and welding slag in the oxygen.

[0027] ​The oxygen mixer 6 is provided with a honeycomb ceramic fiber filter layer filter screen. The honeycomb structure is formed by sintering ceramic fiber at high temperature, and the honeycomb structure increases the filtering area. The filter screen and the inner wall of the oxygen mixer 6 are connected by buckling, which is convenient for disassembly, cleaning and replacement.

[0028] The air filter 8 is a stainless steel folded filter element. The filter element adopts a 316L stainless steel folded structure with a folding height of 50 mm and a folding pitch of 2 mm. The surface of the filter element is treated by electrochemical polishing to reduce flow resistance and improve filtering efficiency. The filter element and the shell are connected by quick mounting, which is convenient for quick replacement and maintenance.

[0029] The filter 3, the oxygen mixer 6 and the air filter 8 all adopt a 316L stainless steel shell with a pressure resistance of ≥4 MPa. The shell is made of 316L stainless steel and has a wall thickness of 6 mm to ensure a pressure resistance of ≥4 MPa. The shell has a streamlined design inside to reduce flow resistance and improve delivery efficiency. The shell and the filter element and each filter screen adopt a double sealing structure to ensure sealing performance.

[0030] The oxygen mixer 6 has a ring-shaped gradually expanding structure. The ring-shaped gradually expanding structure has a gradually expanding angle of 15±1° and a gradually expanding segment length to pipe diameter ratio of 3:1. The outer wall of the oxygen mixer 6 adopts a 316L stainless steel tapered structure.

[0031] The electromagnetic valve 4 is a direct-acting high-frequency response valve. The valve body is made of forged aluminum alloy ZL205A, which is light in weight and corrosion-resistant. The valve core is plated with hard chromium for good wear resistance, and the response time is ≤0.1s. The electromagnetic valve 4 is connected in series with the pneumatic valve 5 to form redundant control and improve system reliability. The electromagnetic valve 4 is connected with an external control system to realize remote control.

[0032] The pneumatic valve 5 is an angular travel butterfly valve. The valve body is made of bidirectional stainless steel 2205, which is corrosion-resistant and high-strength. The sealing ring is made of perfluoroether rubber, which is resistant to high temperature and wear. The valve is equipped with a double-acting cylinder drive for stable and reliable operation.

[0033] The manual valve 2 is a high-pressure resistant stop valve. The valve body is made of SA-105 carbon steel, which is high-strength and has excellent pressure resistance. The sealing pair adopts a silicon carbide / graphite combined sealing ring, which has good sealing performance and long service life. The electromagnetic valve 4, the pneumatic valve 5 and the manual valve 2 are all installed through flanges.

[0034] The standard parts used in the utility model can be purchased from the market, the special-shaped parts can be ordered according to the description and the drawings, the specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art, the machinery, parts and equipment adopt the conventional type in the prior art, the circuit connection adopts the conventional connection mode in the prior art, and the details are not described herein, and the contents not described in detail in the description belong to the prior art known by the professional technical personnel.

[0035] The above is only a preferred embodiment of the utility model, and does not limit the utility model in other forms, and any skilled person in the art can change or modify the equivalent embodiments applied to other fields by using the disclosed technical content, but any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model without departing from the technical scheme content of the utility model still belongs to the protection scope of the technical scheme of the utility model.

Claims

1. A blast furnace machine front oxygen-rich use amount automatic adjusting pipeline, characterized in that, The oxygen pipeline is provided with a manual valve at the front end, a filter is arranged on the oxygen pipeline, an electromagnetic valve and a pneumatic valve are arranged on the rear side of the filter on the oxygen pipeline, the oxygen pipeline is connected to an oxygen mixer, the oxygen mixer is arranged on an input pipeline, the input pipeline is provided with an air filter at the front end and connected to an axial flow fan at the tail end.

2. The automatic adjusting pipeline for oxygen-enriched dosage in front of a blast furnace according to claim 1, characterized in that, The filter is a multi-layer sintered metal filter screen.

3. The automatic adjusting pipeline for oxygen-enriched dosage in front of a blast furnace according to claim 2, characterized in that, The oxygen mixer is internally provided with a honeycomb ceramic fiber filter layer screen.

4. The automatic adjusting pipeline for oxygen-enriched dosage in front of a blast furnace according to claim 3, characterized in that, The air filter is a stainless steel folding filter element.

5. The automatic adjusting pipeline for oxygen-enriched dosage in front of a blast furnace according to claim 4, characterized in that, The filter, the oxygen mixer and the air filter all adopt a 316L stainless steel shell with a pressure resistance of ≥4MPa.

6. The automatic adjusting pipeline for oxygen-enriched dosage in front of a blast furnace according to claim 2, characterized in that, The oxygen mixer is of a ring-shaped gradually expanding structure.

7. The automatic adjusting pipeline for oxygen-enriched dosage in front of a blast furnace according to claim 1, characterized in that, The electromagnetic valve is a direct-acting high-frequency response valve, the valve body is made of forged aluminum alloy ZL205A; the pneumatic valve is an angular stroke butterfly valve, the valve body is made of bidirectional stainless steel 2205; the manual valve is a high-pressure resistant stop valve, the valve body is integrally forged SA-105 carbon steel, and the electromagnetic valve, the pneumatic valve and the manual valve are all installed through flanges.

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