CN104392120B - The design method of blast-furnace hot-air surrounding pipes girt - Google Patents
The design method of blast-furnace hot-air surrounding pipes girt Download PDFInfo
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- CN104392120B CN104392120B CN201410643385.3A CN201410643385A CN104392120B CN 104392120 B CN104392120 B CN 104392120B CN 201410643385 A CN201410643385 A CN 201410643385A CN 104392120 B CN104392120 B CN 104392120B
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Abstract
The invention provides a kind of design method of blast-furnace hot-air surrounding pipes girt, comprise the following steps：Active force and calculate the active force that the deformation of bustle pipe is produced to pull bar that step 1, the blast of calculating hot blast main pipe are produced to pull bar；Step 2, the maximum force according to suffered by step 1 result of calculation calculates single pull bar；Step 3, the size of maximum force according to suffered by single pull bar, determine the diameter of pull bar.Pass through the design method of blast-furnace hot-air surrounding pipes girt of the present invention, the personnel of being typically designed can quickly and accurately design the pull bar of blast-furnace hot-air surrounding pipes, on the premise of safety coefficient and intensity requirement is ensured, material and structural dimension optimization design to girt, reaching reduces the purpose of cost.
Description
Technical field
The present invention relates to BF Design field, specifically a kind of design method of blast-furnace hot-air surrounding pipes girt.
Background technology
For a long time, the section structural of blast furnace system has all selected sufficiently large size in design, many structures
Rigidity, intensity are all far beyond required safety coefficient, and its reliability is unquestionable, and still, the reliability of superelevation is but made
There is very big redundancy in the physical dimension into material, cause the waste of material and the raising of cost.
The section structural of blast furnace system by rational design analysis, is not set on the basis of original empirical value
Meter, project planner does not simultaneously know about the structure in any safe condition, it is unclear that its physical dimension and capacity of equipment are deposited
In how many redundancy, therefore be all the related data with reference to old drawing when doing new engineering design every time, it is impossible to dependency structure and
Capacity of equipment makes optimization, can not improve the designing quality of drawing, ultimately results in engineering cost and remains high.
Corresponding optimization cannot be made to construction drawing by lacking related design analysis, which results in design level many
Remained where one is before year on the basis of old drawing, designing quality can not be improved, it is impossible to adapt to the requirement of new situations.
The girt of blast-furnace hot-air surrounding pipes due to by hot blast main pipe blind flange force and bustle pipe HTHP deformation
Influence, its stressing conditions are extremely complex.The design of pull bar can carry out calculating analysis, but answering due to software with finite element software
The complexity of polygamy and pull bar stress, only could obtain design knot by the personnel of specialized training after the analysis taken time and effort
Really, general project planner is difficult to grasp this design method.
The content of the invention
Cause waste of material and cost higher to overcome the part-structure of blast furnace system in the prior art not optimized
Deficiency, the invention provides a kind of design method of blast-furnace hot-air surrounding pipes girt, ensureing that safety coefficient and intensity will
On the premise of asking, the material and dimensional structure of pull bar are optimized, reaching reduces the purpose of cost.
The technical solution adopted for the present invention to solve the technical problems is：A kind of design of blast-furnace hot-air surrounding pipes girt
Method, comprises the following steps：Active force and calculate bustle pipe that step 1, the blast of calculating hot blast main pipe are produced to pull bar
The active force that is produced to pull bar of deformation；Step 2, the maximum force according to suffered by step 1 result of calculation calculates single pull bar；
Step 3, the size of maximum force according to suffered by single pull bar, determine the diameter of pull bar.
Further, step 1 includes：Hot blast in step 1.1a, calculating hot blast main pipe, should to the blind flange force of bustle pipe
The calculation formula of blind flange force isFMBFor blind flange force, unit is N；d0For the internal diameter of hot blast main pipe, unit is mm；
P is hot-blast pressure, and unit is MPa.
Further, step 1 also includes：Hot-blast pressure P is produced to single pull bar in step 1.1b, calculating hot blast main pipe
Maximum force, the calculation formula of the maximum force isFDMBFor hot blast in hot blast main pipe
The maximum force that pressure P is produced to single pull bar, unit is N；α1...αnFor each pull bar and the angle of hot blast main pipe, unit is
Degree.
Further, step 1 includes：Step 1.2a, the external diameter of calculating bustle pipe are setting the deformation under pressure is acted on
Amount, the bustle pipe set pressure act under Deformation calculation formula asΔd1Set for bustle pipe
Deflection under constant-pressure effect, unit is mm；D0For the central diameter of bustle pipe, unit is mm；D is the internal diameter of bustle pipe,
Unit is mm；δ is the wall thickness of bustle pipe, and unit is mm；E is the corresponding modulus of elasticity of material of bustle pipe, and unit is
MPa。
Further, step 1 also includes：Step 1.2b, calculate bustle pipe external diameter design temperature effect under deformation
Amount, the calculation formula of the deflection of the external diameter of the bustle pipe under design temperature effect is
Δd2For bustle pipe external diameter design temperature effect under deflection, unit mm；α is the corresponding line of material of bustle pipe
The coefficient of expansion, unit is 1/ DEG C；T1For the installation temperature of bustle pipe, unit for DEG C；T2For the operating temperature of bustle pipe, list
Position for DEG C.
Further, step 1 also includes：Step 1.2c, the external diameter of calculating bustle pipe unilateral total deformation, total change
The calculation formula of shape amount isΔ R is total deformation, and unit is mm.
Further, step 1 also includes：The unilateral total deformation correspondence of step 1.2d, calculating bustle pipe produces equal change
The pure pressure of shape, the calculation formula of the pure pressure isPZFor the unilateral total deformation correspondence of bustle pipe
The pure pressure of equivalent variations is produced, unit is MPa；Δ l is that the expansion for the bustle pipe that structure and installation factor can absorb becomes
Shape amount, unit is mm.
Further, step 1 also includes：Step 1.2e, the effect that pull bar counteracting bustle pipe deformation needs offer is provided
Power, the calculation formula of the active force is FBX=PZAb, FBXThe active force that bustle pipe deformation needs to provide, unit are offset for pull bar
For N；A for pull bar bearing and bustle pipe contact surface length, unit is mm；B is the bearing and bustle pipe of pull bar
The width of contact surface, unit is mm.
Further, step 2 includes offsetting active force and hot blast main pipe that bustle pipe deformation needs to provide according to pull bar
The maximum force that the blast of interior hot blast is produced to single pull bar calculates the maximum force suffered by single pull bar, single pull bar institute
The calculation formula for the maximum force received is FMAX=FDMB+FBX, FMAXFor the maximum force suffered by single pull bar, unit is N.
Further, step 3 includes：Step 3.1, the safety coefficient and making material for choosing pull bar, and determine pull bar
Allowable stress [σ]；Step 3.2, the diameter for determining pull bar, the calculation formula of the diameter isFor the straight of pull bar
Footpath, unit is mm.
The beneficial effects of the invention are as follows by the design method of blast-furnace hot-air surrounding pipes girt of the present invention, be typically designed
Personnel can quickly and accurately design the pull bar of blast-furnace hot-air surrounding pipes, on the premise of safety coefficient and intensity requirement is ensured,
Material and structural dimension optimization design to girt, reaching reduces the purpose of cost.
Brief description of the drawings
The Figure of description for constituting the part of the application is used for providing a further understanding of the present invention, and of the invention shows
Meaning property embodiment and its illustrate be used for explain the present invention, do not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is hot blast main pipe, bustle pipe, the mounting arrangements schematic diagram of column and pull bar in the embodiment of the present invention.
Reference in figure：1st, column；2nd, pull bar；3rd, hot blast main pipe；4th, bustle pipe.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
The invention provides a kind of design method of blast-furnace hot-air surrounding pipes girt, comprise the following steps：Step 1, meter
Active force and calculate the effect that the deformation of bustle pipe 4 is produced to pull bar 2 that the blast of calculation hot blast main pipe 3 is produced to pull bar 2
Power；Step 2, the maximum force according to suffered by step 1 result of calculation calculates single pull bar 2；Step 3, according to the single institute of pull bar 2
The size for the maximum force received, determines the diameter of pull bar 2.
By the design method of blast-furnace hot-air surrounding pipes girt of the present invention, the personnel of being typically designed can be quickly and accurately
The pull bar 2 of blast-furnace hot-air surrounding pipes is designed, on the premise of safety coefficient and intensity requirement is ensured, to the material and knot of pull bar 2
The dimensionally-optimised design of structure, reaching reduces the purpose of cost.
Specifically, above-mentioned steps 1 include step 1.1a and step 1.1b.It is specific as follows：
Step 1.1a, hot blast in hot blast main pipe 3 is calculated to the blind flange force of bustle pipe 4d0For heat
The internal diameter of wind supervisor 3, unit is mm, and P is the pressure of hot blast, and unit is MPa.It should be noted that in the embodiment of the present invention
The temperature for referring to hot blast is 1200 DEG C.
The maximum force that the pressure P of hot blast is produced to single pull bar 2 in step 1.1b, calculating hot blast main pipe 3α1...αnFor each pull bar 2 and the angle of hot blast main pipe 3, unit is degree.
Further, step 1 also includes step 1.2a~step 1.2e, wherein,
Step 1.2a, the external diameter of calculating bustle pipe 4 are setting the deflection under pressure is acted onD0For
The central diameter of bustle pipe 4, unit is mm, and d is the internal diameter of bustle pipe 4, and unit is mm, and δ is the wall thickness of bustle pipe 4, unit
For mm, E is the corresponding modulus of elasticity of material of bustle pipe 4, and unit is MPa.
Step 1.2b, calculate bustle pipe 4 external diameter design temperature effect under deflection
α is the corresponding linear expansion coefficient of material of bustle pipe 4, and unit is 1/ DEG C, T1For the installation temperature of bustle pipe 4, unit is
DEG C, T2For the operating temperature of bustle pipe 4, unit for DEG C.
Step 1.2c, the external diameter of calculating bustle pipe 4 unilateral total deformation
Step 1.2d, the pure pressure for calculating the unilateral total deformation correspondence generation equivalent variations of bustle pipe 4Δ l is the dilatancy amount for the bustle pipe 4 that structure and installation factor can absorb, and unit is mm.
Wherein, Δ l size is the gap value that girt is reserved in installation process, according to different erecting beds and mounting ring
Border, Δ l size can be in 2mm to suitably changing between 5mm.
Step 1.2e, the directed force F that the counteracting deformation needs offer of bustle pipe 4 of pull bar 2 is providedBX=PZAb, a are pull bar 2
Bearing and bustle pipe 4 contact surface length, unit is mm, b for pull bar 2 bearing and the contact surface of bustle pipe 4
Width, unit is mm.
It should be noted that the active force that the blast for calculating hot blast main pipe 3 is produced to pull bar 2 is with calculating bustle pipe 4
Deform the order of operation of the active force produced to pull bar 2 in no particular order.
Step 2 in the embodiment of the present invention include according to pull bar 2 offset the deformation of bustle pipe 4 need the active force that provides and
The maximum force that the blast of hot blast is produced to single pull bar 2 in hot blast main pipe 3 calculates the maximum force suffered by single pull bar
FMAX=FDMB+FBX。
Further, step 3 includes：
Step 3.1, the safety coefficient and making material for choosing pull bar 2, and determine the allowable stress [σ] of pull bar 2；
Step 3.2, the diameter for determining pull bar 2
With reference to shown in Fig. 1, design method of the present invention is introduced by taking 8 pull bars 2 as an example below.Bustle pipe 4 passes through
Pull bar 2 is connected with column 1, and above-mentioned hot blast main pipe 3 is arranged on bustle pipe 4.Using the design method in the embodiment of the present invention
The diameter of pull bar 2 is designed, wherein, the internal diameter d of hot blast main pipe 30For 2450mm, hot-blast pressure P is 0.5MPa, each pull bar 2 and heat
The angle α of wind supervisor 31...αnRespectively 89 °, 19 °, 1 °, 71 °, 89 °, 19 °, 1 °, 71 °, the central diameter D of bustle pipe 40For
2466mm, the internal diameter d of bustle pipe 4 is 2450mm, and the wall thickness δ of bustle pipe 4 is 16mm, the installation temperature T of bustle pipe 41
For 20 DEG C, the work temperature of bustle pipe 42For 200 DEG C, the bearing of pull bar 2 is with the length a of the contact surface of bustle pipe 4
The width b of 600mm, the bearing of pull bar 2 and the contact surface of bustle pipe 4 is 400mm.
First, according to step 1.1a, by hot-blast pressure P and the internal diameter d of hot blast main pipe 30Substitute into formula
It is 2.357 × 10 to the blind flange force size of bustle pipe 4 to calculate the hot blast in hot blast main pipe 36N。
According to step 1.1b, by each pull bar 2 and the angle α of hot blast main pipe 31...αnSubstitute into formula
The maximum force size that the pressure P of hot blast is produced to single pull bar 2 in calculating hot blast main pipe 3 is 2.575 × 105N。
Secondly, according to step 1.2a, by the internal diameter d of bustle pipe 4, the wall thickness δ of bustle pipe 4 and the material of bustle pipe 4
Expect that corresponding elastic modulus E is updated to formulaIn, the external diameter for calculating bustle pipe 4 is made in setting pressure
Deflection size under is 0.45mm.
Further, it is determined that the corresponding linear expansion coefficient α sizes of the material of bustle pipe 4 are 1.3 × 10-5/ DEG C, and by heat
The installation temperature T of wind bustle pipe 41With the work temperature of bustle pipe 42Substitute into formulaCalculate
Go out deflection 11.48mm of the external diameter of bustle pipe 4 under design temperature effect.
According to step 1.2c, the unilateral total deformation size for calculating external diameter is 5.96mm.
According to step 1.2d, determine the bustle pipe 4 that structure and installation factor can absorb dilatancy amount Δ l it is big
Small is 4mm, and dilatancy amount Δ l is substituted into formulaCalculate the unilateral total change of bustle pipe 4
The pure pressure size that shape amount correspondence produces equivalent variations is 1.36MPa.
According to step 1.2e, by the length a and pull bar 2 of the bearing of pull bar 2 and the contact surface of bustle pipe 4 bearing and heat
The width b of the contact surface of wind bustle pipe 4 substitutes into formula FBX=PZAb, calculating pull bar 2 and offsetting bustle pipe 4 and deform needs to provide
Amount of force be 8.57 × 104N.Again, the maximum force size suffered by calculating single pull bar is calculated according to step 2
For 3.43 × 105N。
The safety coefficient grade of pull bar 2 in the embodiment of the present invention is 2, and making material is 35 steel modifier treatment.Therefore, look into
Table show that allowable stress [σ] size of pull bar 2 is 147.5MPa, and according to step 3.2, above-mentioned numerical value is substituted into formulaThe diameter value size that pull bar 2 can be calculated is 54.43mm.
The diameter of pull bar 2 can choose the integer value closest to critical value, i.e. d=55mm, but existing in view of ironmaking
The concrete condition of field, pull bar diameter can suitably be increased in 25% to 35%, the present invention take d=70mm.And in the prior art,
In the internal diameter d of hot blast main pipe 30, hot-blast pressure P, the angle α of each pull bar 2 and hot blast main pipe 31...αn, bustle pipe 4 central diameter,
The internal diameter d of bustle pipe 4, the wall thickness δ of bustle pipe 4, the installation temperature T of bustle pipe 41, bustle pipe 4 operating temperature,
The bearing of pull bar 2 and the length a of the contact surface of bustle pipe 4 and the width b of the bearing of pull bar 2 and the contact surface of bustle pipe 4
Etc. parameter all same when, according to conventional design experiences choose pull bar 2 diameter be 110mm, it can be seen that, according to this hair
The diameter for the pull bar 2 that bright design method is designed is smaller, can cross the purpose for reaching and saving material.
The pull bar 2 obtained using design method of the present invention is applied among multiple Practical Projects, by (2 years for a long time
More than) use, it was demonstrated that the pull bar 2 that design method of the present invention is obtained disclosure satisfy that service life requirement, meet national security mark
It is accurate.Therefore, according to embodiments of the present invention in the pull bar 2 that obtains of design method disclosure satisfy that the premise of national associated safety requirement
Under, reach cost-effective purpose.
As can be seen from the above description, the above embodiments of the present invention realize following technique effect：By this hair
The design method of bright blast-furnace hot-air surrounding pipes girt, the personnel of being typically designed can quickly and accurately design blast-furnace hot-air and enclose
Pipe girt, on the premise of safety coefficient and intensity requirement is ensured, sets to the material and structural dimension optimization of girt
Meter, reaching reduces the purpose of cost.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (2)
1. a kind of design method of blast-furnace hot-air surrounding pipes girt, it is characterised in that comprise the following steps：
The deformation of active force and calculating bustle pipe (4) that step 1, the blast of calculating hot blast main pipe (3) are produced to pull bar (2)
The active force produced to pull bar (2)；
Hot blast in step 1.1a, calculating hot blast main pipe (3) is to the blind flange force of bustle pipe (4), the calculation formula of the blind flange force
ForFMBFor blind flange force, unit is N；d0For the internal diameter of hot blast main pipe (3), unit is mm；P is hot-blast pressure,
Unit is MPa；
The maximum force that step 1.1b, calculating hot blast main pipe (3) interior hot-blast pressure P are produced to single pull bar (2), the most your writing
Calculation formula firmly isFDMBIt is the interior hot-blast pressure P of hot blast main pipe (3) to single pull bar
(2) maximum force produced, unit is N；α1...αnFor each pull bar (2) and the angle of hot blast main pipe (3), unit is degree；
Step 1.2a, deflection of the external diameter of bustle pipe (4) under setting pressure effect is calculated, the bustle pipe (4) setting
Constant-pressure effect under Deformation calculation formula beΔd1Be bustle pipe (4) setting pressure effect under
Deflection, unit is mm；D0For the central diameter of bustle pipe (4), unit is mm；D is the internal diameter of bustle pipe (4), and unit is mm；
δ is the wall thickness of bustle pipe (4), and unit is mm；E is the corresponding modulus of elasticity of material of bustle pipe (4), and unit is MPa；
Step 1.2b, calculate deflection of the external diameter of bustle pipe (4) under design temperature effect, the bustle pipe (4) it is outer
The calculation formula of deflection of the footpath under design temperature effect beΔd2For bustle pipe (4)
External diameter design temperature effect under deflection, unit mm；α is the corresponding linear expansion coefficient of material of bustle pipe (4), single
Position is 1/ DEG C；T1For the installation temperature of bustle pipe, unit for DEG C；T2For the operating temperature of bustle pipe, unit for DEG C；
Step 1.2c, calculate bustle pipe (4) external diameter unilateral total deformation, the calculation formula of the total deformation isΔ R is total deformation, and unit is mm；
Step 1.2d, the pure pressure for calculating the unilateral total deformation correspondence generation equivalent variations of bustle pipe (4), the meter of the pure pressure
Calculating formula isPZThe pure pressure of equivalent variations is produced for the unilateral total deformation correspondence of bustle pipe (4),
Unit is MPa；Δ l is the dilatancy amount for the bustle pipe (4) that structure and installation factor can absorb, and unit is mm；
Step 1.2e, the active force for calculating pull bar (2) counteracting bustle pipe (4) deformation needs offer, the calculating of the active force are public
Formula is FBX=PZAb, FBXThe active force that bustle pipe (4) deformation needs to provide is offset for pull bar (2), unit is N；A is pull bar
(2) length of bearing and the contact surface of bustle pipe (4), unit is mm；B is the bearing and bustle pipe (4) of pull bar (2)
The width of contact surface, unit is mm；
Step 2, the maximum force according to suffered by step 1 result of calculation calculates single pull bar (2), heat is offset according to pull bar (2)
Wind bustle pipe (4) deformation needs the maximum that the blast of active force and hot blast main pipe (3) the interior hot blast provided is produced to single pull bar (2)
Maximum force suffered by the single pull bar of Calculation of the force (2), the calculation formula of the maximum force suffered by single pull bar (2) is
FMAX=FDMB+FBX, FMAXFor the maximum force suffered by single pull bar (2), unit is N；
Step 3, the size of maximum force according to suffered by single pull bar (2), determine the diameter of pull bar (2).
2. the design method of blast-furnace hot-air surrounding pipes girt according to claim 1, it is characterised in that the blast furnace heat
The design method of wind bustle pipe girt also includes：
Step 3.1, the safety coefficient and making material for choosing pull bar (2), and determine the allowable stress [σ] of pull bar (2)；
Step 3.2, the diameter for determining pull bar (2), the calculation formula of the diameter isD is the diameter of pull bar (2),
Unit is mm.
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