Converter gas dry dedusting system adopting submicron electric dedusting technology

Abstract

The utility model discloses a converter gas dry dust removal system adopting a submicron electric dust removal technology, which comprises an evaporative cooler, a submicron electric dust remover, a fan, an analyzer and a switching valve which are connected in sequence, when the analyzer judges that coal gas passing through the fan reaches the recovery standard, the switching valve is switched to the coal gas cooler, the coal gas enters the coal gas cooler to be cooled, and the coal gas enters the coal gas cooler to be cooled. The cooled coal gas enters the coal gas cabinet, when the analyzer judges that the coal gas passing through the fan does not reach the recovery standard, the switching valve is switched to the diffusion chimney, the coal gas enters the diffusion chimney, the submicron electric dust remover comprises a first outer plate, a first anode plate, an inner plate, a second anode plate and a second outer plate which are sequentially arranged, and the inner plate is provided with an opening. According to the utility model, dust can be deeply removed, so that the emission of the dust removal system meets the ultra-low emission requirement.

Description

Technical Field

[0001] The utility model relates to a converter gas dry dust removal system adopting submicron electric dust removal technology. Background Art

[0002] At present, due to the particularity of the flue gas and high explosion-proof requirements, the main dust removal methods used in China are dry dust removal and dry electrostatic dust removal systems for converters. The above dust removal systems do not meet the national environmental protection requirements of 10mg / Nm due to the increase in environmental protection requirements, aging and instability of equipment during use, etc. 3 Below, there are situations such as black smoke, yellow smoke, and yellow smoke coming out of the furnace mouth. Utility Model Content

[0003] In order to solve the above problems, the utility model discloses a converter gas dry dust removal system using submicron electrostatic precipitator technology, which can deeply evolve dust removal so that the emissions of the dust removal system meet ultra-low emission requirements.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a converter gas dry dust removal system using submicron electrostatic precipitator technology, comprising an evaporative cooler, a submicron electrostatic precipitator, a fan, an analyzer and a switching valve connected in sequence; the converter gas dry dust removal system also comprises a venting chimney arranged on one side of the switching valve, and a gas cooler arranged on the other side of the switching valve and a gas holder connected to the gas cooler; wherein, when the analyzer determines that the gas passing through the fan reaches a recovery standard, the switching valve switches to the gas cooler, the gas enters the gas cooler for cooling, and the cooled gas enters the gas holder; when the analyzer determines that the gas passing through the fan does not reach the recovery standard, the switching valve switches to the venting chimney, and the gas enters the venting chimney; wherein, the submicron electrostatic precipitator comprises a first outer plate, a first anode plate, an inner plate, a second anode plate and a second outer plate arranged in sequence, and the inner plate has an opening.

[0005] As a further solution of the utility model, the opening of the inner plate is arranged in the middle, and the diameter of the opening is 5mm-100mm.

[0006] As a further solution of the present invention, the thickness of the inner plate is 1mm-3mm.

[0007] As a further solution of the utility model, the first outer plate, the inner plate and the second outer plate are vertically arranged, the first anode plate and the second anode plate are respectively welded on both sides of the inner plate and are inclined from the top of the inner plate to the outside at a predetermined angle, and the thickness of the first anode plate and the second anode plate are respectively 1mm-3mm.

[0008] As a further solution of the present invention, the predetermined angle is 30° to 90°.

[0009] As a further solution of the present invention, the first outer plate and the second outer plate are respectively steel plates with an opening rate of 40% to 80%.

[0010] As a further solution of the utility model, the submicron electrostatic precipitator also includes a frame, and the first outer plate, the first anode plate, the inner plate, the second anode plate and the second outer plate are welded to the frame.

[0011] As a further solution of the utility model, it also includes a recovery and release system connected to the coal gas cooler, and the cooled coal gas that does not reach the predetermined temperature enters the recovery and release system.

[0012] As a further solution of the utility model, the recycling standard is to reduce the dust content in the flue gas to 10mg / Nm 3 the following.

[0013] The application of the submicron particle electrostatic precipitator technology of the utility model will be a disruptive change to the entire electrostatic precipitator industry, especially in the primary dry dust removal of the converter and the dust removal of the sintering machine head. After the submicron particle electrostatic precipitator technology is adopted in the fourth electric field of the electrostatic precipitator of the primary dust removal system of the converter, the dust collector emissions can meet the ultra-low emission requirements, which can completely replace the coal gas cooling forward, coal gas cooling forward + wet electricity, metal filter bags and other technologies, and can replace all the above technologies for promotion in this field. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 This is a schematic diagram of a converter gas dry dust removal system using submicron electrostatic precipitator technology.

[0016] Figure 2 Schematic diagram of a submicron electrostatic precipitator.

[0017] Explanation of symbols in the accompanying drawings:

[0018] Pipeline 1; evaporative cooler 2; submicron electrostatic precipitator 3; fan 4; switching station 5; venting chimney 6; recovery and venting system 7; gas cooler 8; gas cabinet 9;

[0019] Frame 10; inner plate 59; first anode plate, second anode plate 60; first outer plate, second outer plate 61. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0022] The utility model discloses a converter gas dry dust removal system adopting submicron electrostatic precipitator technology, which is mainly used in the primary dust removal field of converter steelmaking and deep flue gas purification and dust removal equipment for the primary flue gas in converter smelting that fails to meet the flue gas emission standards after the original dry electrostatic precipitator.

[0023] The converter gas dry dust removal system according to the utility model comprises an evaporative cooler 2, a submicron electrostatic precipitator 3, a fan 4, an analyzer (not shown) and a switching valve 5 which are arranged in sequence, and the converter gas dry dust removal system also comprises a venting chimney 6 arranged on one side of the switching valve 5, and a gas cooler 8 arranged on the other side of the switching valve 5 and a gas cabinet 9 connected to the gas cooler 8. Optionally, the converter gas dry dust removal system may further comprise a recovery and venting system 7 connected to the gas cooler 8.

[0024] The flue gas discharged from the flue 1 is cooled, roughly dust-removed, and conditioned by the evaporative cooler 2, and then enters the submicron electrostatic precipitator 3 through the raw gas pipeline for fine dust removal, so that the dust content in the flue gas is reduced to 10mg / Nm 3 Next, the purified flue gas passes through the fan 4 and the analyzer arranged between the fan 4 and the switching valve 5 to determine whether the gas is suitable for recovery. The gas that meets the recovery standard enters the gas cooler 8 for cooling through the switching valve 5. The gas with a cooling temperature lower than the predetermined temperature (for example, 70°C) enters the gas cabinet 9, and the gas with a cooling temperature not lower than 70°C enters the recovery and release system 7. The unqualified gas enters the release chimney 6 through the switching valve 5 and is ignited and dispersed.

[0025] Preferably, the flue gas enters the evaporative cooler 2, and the flue gas temperature is reduced from 600°C-1100°C to below 300°C. At the same time, large particles of dust in the flue gas are roughly removed and the resistivity of the dust is tempered to facilitate the subsequent electrostatic precipitator.

[0026] Preferably, the flue gas is finely dedusted in the submicron electrostatic precipitator 3, and the dust is reduced from 100-150g / Nm 3 The dust is reduced to 10mg / Nm 3 The flue gas contains flammable and explosive gases, so the submicron dust collector 3 adopts an explosion-proof dust collector. The dust in the flue gas is dry dust, which is easy to transport and store.

[0027] Preferably, the fan 4 pumps the flue gas from the converter to the chimney or gas cabinet, and can be an axial flow fan or a centrifugal fan. Preferably, the analyzer analyzes CO, CO2 and O2 in the flue gas to determine whether the system flue gas can be recycled.

[0028] Specifically, the submicron dust collector adopts five layers of plates, namely, a first outer plate 61, a first anode plate 60, an inner plate 59, a second anode plate 60 and a second outer plate 61 which are arranged in sequence, wherein the inner plate 59 has an opening.

[0029] Preferably, the opening of the inner plate 59 is arranged in the middle, and the diameter of the opening is 5 mm-100 mm.

[0030] Preferably, the thickness of the inner plate 59 is 1 mm-3 mm.

[0031] Preferably, the first outer plate 61, the inner plate 59 and the second outer plate 61 are vertically arranged, the first anode plate 60 and the second anode plate 60 are respectively welded on both sides of the inner plate 59 and are respectively inclined from the top of the inner plate 59 to the outside at a predetermined angle (for example, 30° to 90°), and the thickness of the first anode plate 60 and the second anode plate 60 are respectively 1mm-3mm.

[0032] Preferably, the first outer plate 61 and the second outer plate 61 are respectively steel plates with an opening rate of 40% to 80%.

[0033] Preferably, the submicron electrostatic precipitator further comprises a frame 10 , and the first outer plate 61 , the first anode plate 60 , the inner plate 59 , the second anode plate 60 and the second outer plate 61 are welded to the frame 10 .

[0034] In the utility model, the inner plate 59 has an opening, and an electric field is generated due to the arrangement of the first anode plate 60 and the second anode plate 60. Under the action of the electric field, ultrafine dust is transmitted to the cavity formed by the inner plate 59, the inclined first anode plate 60 and the second anode plate 60, and is locked in the cavity by the first anode plate 60 and the second anode plate 60 under the action of the electric field. The charged dust is adsorbed on the first anode plate 60, the second anode plate 60 and the inner plate 59 in the cavity, and is also adsorbed on the inner walls of the first outer plate 61 and the second outer plate 61. The dust collection method is changed from traditional surface dust collection to cavity three-dimensional dust collection, which has a larger dust collection area, and a sealed electric field is arranged around the electric field. The full flow field purification technology is adopted to avoid short-circuit channels in the travel, which affects the dust removal effect.

[0035] In addition, since the inner plate 59 has an opening, a cavity is formed between the first anode plate 60 and the second anode plate 60. When a flash explosion occurs, the local high-speed thermal expansion gas can quickly pass through the inner plate 59, the first anode plate 60 and the second anode plate 60 and diffuse in all directions. The plates are less impacted, the operation fluctuations are small, and the emission effect is basically not affected.

[0036] Aiming at the original old converter primary dust removal, which is currently mainly used in China due to the particularity of its flue gas and high explosion-proof requirements, the primary dry dust removal is unstable. This utility model can make the flue gas finally maintain at 10㎎ / Nm 3 The following is to achieve ultra-low flue gas emission requirements.

[0037] The invention has low investment and short converter downtime during transformation. The resistance is less than 100pa, the operating cost is low, and the smoke content can reach 10mg / Nm 3 the following.

[0038] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

Claims

1. A converter gas dry dust removal system using submicron electrostatic precipitator technology, characterized in that: The converter gas dry dust removal system comprises an evaporative cooler, a submicron electrostatic precipitator, a fan, an analyzer and a switching valve connected in sequence. The converter gas dry dust removal system also comprises a venting chimney arranged on one side of the switching valve, a gas cooler arranged on the other side of the switching valve and a gas cabinet connected to the gas cooler. When the analyzer determines that the gas passing through the fan reaches the recovery standard, the switching valve switches to the gas cooler, the gas enters the gas cooler for cooling, and the cooled gas enters the gas cabinet. When the analyzer determines that the gas passing through the fan does not meet the recovery standard, the switching valve switches to the emission chimney, and the gas enters the emission chimney. The submicron electrostatic precipitator comprises a first outer plate, a first anode plate, an inner plate, a second anode plate and a second outer plate which are arranged in sequence, and the inner plate has an opening.

2. The converter gas dry dust removal system using submicron electrostatic precipitator technology according to claim 1 is characterized in that: The opening of the inner plate is arranged in the middle, and the diameter of the opening is 5mm-100mm.

3. The converter gas dry dust removal system using submicron electrostatic precipitator technology according to claim 1 is characterized in that: The thickness of the inner plate is 1mm-3mm.

4. The converter gas dry dust removal system using submicron electrostatic precipitator technology according to claim 1 is characterized in that: The first outer plate, the inner plate and the second outer plate are arranged vertically, the first anode plate and the second anode plate are respectively welded on both sides of the inner plate and are inclined from the top of the inner plate to the outside at a predetermined angle, and the thickness of the first anode plate and the second anode plate are respectively 1mm-3mm.

5. The converter gas dry dust removal system using submicron electrostatic precipitator technology according to claim 4 is characterized in that: The predetermined angle is 30° to 90°.

6. The converter gas dry dust removal system using submicron electrostatic precipitator technology according to claim 1 is characterized in that: The first outer plate and the second outer plate are respectively steel plates with an opening rate of 40% to 80%.

7. The converter gas dry dust removal system using submicron electrostatic precipitator technology according to claim 1 is characterized in that: The submicron electrostatic precipitator further includes a frame, and the first outer plate, the first anode plate, the inner plate, the second anode plate, and the second outer plate are welded to the frame.

8. The converter gas dry dust removal system using submicron electrostatic precipitator technology according to claim 1 is characterized in that: It also includes a recovery and release system connected to the coal gas cooler, and the cooled coal gas that does not reach the predetermined temperature enters the recovery and release system.

9. The converter gas dry dust removal system using submicron electrostatic precipitator technology according to claim 1, characterized in that: The recycling standard is to reduce the dust content in the flue gas to 10 mg / Nm 3 the following.

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