GB/T 50567: Evolution and historical versions
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| GB/T 50567-2022 | English | RFQ |
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Technical code for shell structure of ironmaking furnace
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GB/T 50567-2022
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| GB 50567-2010 | English | RFQ |
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Technical code for shell structure of ironmaking furnace
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GB 50567-2010
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PDF similar to GB/T 50567-2022
Basic data | Standard ID | GB/T 50567-2022 (GB/T50567-2022) | | Description (Translated English) | Technical code for shell structure of ironmaking furnace | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | P73 | | Classification of International Standard | 77.010 | | Word Count Estimation | 172,176 | | Date of Issue | 2022-01-05 | | Date of Implementation | 2022-05-01 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation | | Summary | This standard is applicable to the structure of newly built, renovated and expanded blast furnaces, hot blast stoves, gravity dust collectors and crude gas pipeline shells with an effective volume of 1000m<sup>3</sup>~5000m<sup>3</sup> Design and construction. | GB/T 50567-2022: Technical code for shell structure of ironmaking furnace---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General
1.0.1 This specification is formulated to standardize the structural design and construction of ironmaking process furnace shells, to achieve advanced technology, reasonable economy, safety and applicability, and ensure quality.
1.0.2 This code is applicable to the structural design and construction of newly built, rebuilt and expanded blast furnaces, hot blast furnaces, gravity dust collectors and crude gas pipeline shells with an effective volume of 1000m3 to 5000m3.
1.0.3 In addition to this standard, the design and construction of the shell structure of the iron-making process furnace should also comply with the current relevant national standards.
2 terms
2.0.1 blast furnace blast furnace
A special metallurgical kiln for continuously reducing iron-containing raw materials into pig iron under high temperature and high pressure is the main equipment of contemporary ironmaking production. Use steel plates as the furnace shell, install cooling equipment inside the shell and build a refractory lining or install shell cooling equipment outside the shell and build a refractory lining inside the shell. From top to bottom, the blast furnace body is divided into six parts. the cover, the furnace throat, the furnace body, the furnace waist, the furnace belly, and the hearth.
2.0.2 hot blast stove
The thermal power equipment that heats the cold air blown by the blower to a certain temperature and sends it to the blast furnace. The hot blast stove system is composed of hot blast stove groups, external combustion, and air supply system pipeline valves and other process facilities. Through the alternate combustion and heat storage, air supply and heat release operation of different hot blast stoves in the hot blast stove group, the blast furnace is realized. Continuous air supply. The main body of the hot blast stove is a pressure-bearing steel structure shell lined with refractory and heat-insulating materials. The main body of the hot blast stove is built with refractory structures such as a hot chamber, a combustion chamber and a burner.
2.0.3 de-duster
Process facilities used to remove coarse dust contained in blast furnace gas. Generally, there are typical structural forms such as gravity dust collector and cyclone dust collector.
2.0.4 raw gas pipeline
A large gas pipeline that exports the blast furnace gas generated by the blast furnace smelting reaction and sends the gas to the gas purification facility. It is composed of ascending pipe, descending pipe, five-way ball or three-way pipe.
2.0.5 The campaign life of the first generation furnace service
The actual operating life of a blast furnace from ignition and commissioning to shutdown and overhaul is the life of the structure or components specified in the shell structure design for the intended purpose.
2.0.6 Shell structure shell structure
Sheet-like structures whose mid-surface is curved and whose thickness i is much smaller than the minimum radius of curvature R and plane size can be divided into thin shells and medium-thick shells. The thickness and center of the shell structure of the ironmaking process furnace
The ratio of the minimum curvature radius of the surface is less than 1/50, which belongs to the thin shell structure.
2.0.7 Equivalent stress Equivalent stress
Combined stresses defined by the fourth strength theory used as strength criteria for arbitrary stress states.
2.0.8 allowable stress allowable stress
Allowable limit of equivalent stress. The maximum stress value that a material is allowed to bear in engineering structure design.
2.0.9 elastic analysis elastic analysis
According to elastic failure criterion analysis of structure C and displacement.
2.0.10 elastic-plastic analysis elastic-plastic analysis
A method for calculating the state of a structure under a given load based on the plastic properties of the material.
2.0.11 Welding
Heating by arc or gas flame, etc. and sometimes pressurizing, filling or not filling material to make the connected weldment reach the state of atomic or molecular bonding.
2.0.12_ welding process welding process
All processing methods and implementation requirements related to welding process operation instructions in the production of weldments, including welding preparation, material selection, welding method selection, welding parameters, operation requirements, etc.
2.0.13 Welding process evaluation welding process evaluation
The test process and result evaluation to verify the correctness of the proposed welding process.
2.0.14 butterfly head dished head
It consists of a spherical cap with a large radius in the center, a ring shell with a small radius around the periphery, and a cylindrical diameter section.
2.0.15 Pre-assembled pre-assembly
Assembly to meet the installation quality requirements of the inspection housing.
2.0.16 shell assembly shell assembly
On the platform within the working range of the hoisting machinery at the installation site, the process of assembling the block shells into a complete ring and welding.
2.0.17 Shell installation shell installation
3.0.9 Construction requirements such as manufacturing, inspection, transportation, installation, welding, weld quality inspection, coating, overall air tightness test, and completion acceptance of the shell structure shall comply with the relevant provisions of Chapter 10 of this standard.
4 Loads
4.1 Load classification and load effect combination
4.1.1 The load on the shell structure can be divided into permanent load and variable load.
4.1.2 When designing the shell structure and connections, the combination of load effects should be calculated according to the following formula according to the loads that may act simultaneously during production and use, and the strength should be checked according to the most unfavorable one.
4.1.3 The temperature effect of the shell is resisted by the allowable stress at the design temperature, but the temperature difference effect should not be included.
4.1.4 When designing the anchor bolts connecting the hearth section of the hot blast stove to the foundation, the earthquake action effect should be calculated.
4.2 Shell loads
4.2.1 The blast furnace shell load shall be determined according to Table 4.2.1.
4.2.2 The shell load of the hot blast stove shall be determined according to Table 4.2.2
4.2.3 The shell load of the gravity dust collector shall be determined according to Table 4.2.3.
4.2.4 The shell load of crude gas pipeline shall be determined according to Table 4.2.4.
4.2.5 The standard values of wind load, snow load, platform dust load and platform live load shall comply with the relevant provisions of the current national standard "Code for Building Structure Loads" GB 50009.
5 materials
5.1 Steel
5.1.1 The selection of steel grades shall be determined according to factors such as the importance of the shell structure, structural form, load conditions, stress characteristics, design temperature, corrosive medium characteristics and steel plate thickness.
5.1.2 Except for the bottom plate of the blast furnace, the steel materials of the blast furnace, hot blast stove and five-way spherical shell structure shall have the qualified guarantee of 0℃ impact toughness. Steel materials for other shell structures should have a qualified guarantee of normal temperature impact toughness. The steel carbon equivalent (CEV) of the blast furnace shell structure should not be greater than 0.42% or the welding cold crack sensitivity index (Pcm) should not be greater than 0.26%. The formula (B.1.2-1) and formula (B.1.2-2) in B are calculated using the smelting analysis value.
5.1.3 The steel for blast furnace shell structure should adopt the steel for shell structure in Appendix B of this standard. For the shell structure of blast furnaces with an effective volume of 1200m3~2000m3, Q355C steel, Q390C steel and Q390D steel can be used. The bottom plate of the blast furnace can be made of Q355B steel.
5.1.4 The steel materials for the body and bottom shell of the hot blast stove should be Q355C steel and Q390C steel, and the high-temperature section and vault of the shell should be Q345R steel or the steel for shell structure in Appendix B of this standard.
5.1.5 The steel material for the shell structure of the gravity dust collector should be Q355B steel.
5.3.1 The allowable stress Stm of the steel plate shall take the minimum value among the following values.
1 1/2.4 of the specified minimum tensile strength at room temperature.
1/2.4 of the tensile strength of steel at 2 temperatures.
3 1/1.5 of the specified minimum yield strength at room temperature.
4 1/1.5 of the yield strength at temperature.
5.3.2 The allowable stress of Q355 steel, Q390 steel and Q345R steel shall be selected according to Table 5.3.2 according to the steel plate thickness and design temperature. When selecting other grades of steel plates that meet the requirements of Article 5.1.8 of this standard. The design index should take the allowable stress of the steel plate of the corresponding quality grade.
When the steel strength index at temperature is not obtained, its allowable stress value at temperature can be calculated according to the following formula stipulated by the European Steel Construction Association (ECCS).
In the formula. Stm—the allowable stress value of the steel under the action of temperature;
S20m——The allowable stress value of the steel at 20°C;
——The reduction factor of the allowable stress value of the steel under the action of temperature;
T—calculated temperature of steel.
5.3.3 The allowable stress of the deposited metal of the welded connection may be the allowable stress of the steel plate.
5.3.4 For anchor bolts made of Q235 steel or Q355 steel, the allowable stress Sat should be 1/2 of the yield strength ReH. The allowable stress of anchor bolts may be selected according to Table 5.3.4.
5.3.5 The physical performance index of steel shall be adopted according to Table 5.3.5.
5.3.6 The elastic modulus of steel at different temperatures may be adopted according to Table 5.3.6.
6 blast furnace
6.1 General provisions
6.1.1 When the shell structure is designed to be segmented, it shall meet the layout requirements of ironmaking process equipment, and the blocks of each shell should be large. Shell welds should be arranged at positions with fewer openings or with larger spacing between openings.
6.1.2 The structure of the shell shall be convenient for manufacture, transportation, installation, inspection and maintenance, and the stress on the shell shall be clear, and the stress concentration shall be reduced.
6.1.3 The opening of the shell should be circular, oval or oblong. When opening a rectangular or square hole, the right angle should be smoothly transitioned. Holes should be completed during fabrication, not on site.
.3.2 The inner side of the butt weld joint of the shell should be aligned. When the thickness of the steel plates is different and the thickness difference is more than 6mm, the outer side plate should be made with a slope of 1.4~1.3.
6.3.3 The cross-sectional area of the opening of the shell should not exceed 55% of the total cross-sectional area of the shell for the body section, waist section and bosh section, and the clear distance between the holes should not be less than 100mm; the cross-sectional area of the opening at the tuyere section should not exceed 80% of the total cross-sectional area, and the distance between the outer circles of two adjacent flange tuyeres (Figure 6.3.3) should not be less than.200mm.
6.3.4 In addition to complying with the provisions of Article 6.1.3 of this standard when opening holes in the shell, the holes whose edges are not more than 50mm from the on-site transverse welds and within.200mm from the longitudinal welds should be positioned in the factory. cutting.
6.3.5 The on-site transverse welds of the shell shall not be beveled in the factory within 100mm from the end, and shall be beveled on site after the longitudinal welds are welded and before the transverse welds are welded.
6.3.6 The thickness of the furnace bottom plate should be adopted according to Table 6.3.6.The connection between the ring plate and the shell of the hearth section (Figure 6.3.6) should adopt a combination of T-shaped butt and fillet welds with penetration. The thickness of the ring plate can be twice the thickness of the furnace bottom plate, the width can be 800mm, and the bevel angle should be 1.4~1.3 in the thickness direction. The bottom plate of the furnace should be flat, and welding deformation should be prevented. The bottom plate and the upper flange of the water-cooled beam should be connected by circular plug welding holes. The diameter of the plug welding hole should be 3 times the thickness of the bottom plate. Should be less than 16mm.
6.3.7 Except for the ring plate and the furnace floor, the shell should be made of the same grade of steel, not two or more grades of steel. When different types of steel are used for welding, the welding procedure qualification shall be carried out according to the regulations in Chapter 10 of this standard.
7 hot stove
7.1 Design
7.1.1 The structure of the hot blast stove should adopt internal combustion hot blast stove, top combustion hot blast stove and external combustion hot blast stove.
7.1.2 The shell section of the hot blast stove should be determined according to the needs of the heating process. The shell of the hearth section shall be connected to the foundation by anchor bolts or bolts to the steel platform beam.
7.1.3 The shell of the hot blast stove high temperature section and the vault position should be made of Q345R steel or the steel plate for the hot blast stove shell in Appendix B of this standard, and measures to prevent grain boundary stress corrosion should be taken on the inner surface.
7.1.4 The thickness of each section of the internal combustion hot blast stove shell (Figure 7.1.4) can be calculated according to the following formula.
1 Thickness of furnace top section.
t=3.00D-8 (7.1.4-1)
2 Thickness of straight section of furnace top.
t=3.80D-10 (7.1.4-2)
3 Thickness of oblique line.
t=5.00D-22 (7.1.4-3)
4 Thickness of the upper transition section.
t=5.85D-30 (7.1.4-4)
5 Thickness of shaft section.
t=2.35D-3 (7.1.4-5)
6 Thickness of the lower transition section.
t=6.20D-34 (7.1.4-6)
7 Hearth section thickness.
t=4.30D-12 (7.1.4-7)...
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