CN104392120A - Design method of horizontal pull rod of high furnace bustle pipe - Google Patents
Design method of horizontal pull rod of high furnace bustle pipe Download PDFInfo
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- CN104392120A CN104392120A CN201410643385.3A CN201410643385A CN104392120A CN 104392120 A CN104392120 A CN 104392120A CN 201410643385 A CN201410643385 A CN 201410643385A CN 104392120 A CN104392120 A CN 104392120A
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- pull bar
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Abstract
The invention provides a design method of a horizontal pull rod of a high furnace bustle pipe. The design method comprises the following steps: step 1, calculating the action force applied to the pull rod by air pressure of a hot air main pipe and calculating the action force applied to the pull rod by the bustle pipe; step 2, calculating the maximum action force applied to a single pull rod according to a calculation result of the step 1; step 3, determining the diameter of the pull rod according to the maximum action force applied to the single pull rod. By virtue of the design method of the horizontal pull rod of the high furnace bustle pipe, general design personnel can quickly and accurately design the pull rod of the high furnace bustle pipe; the material and the structural size of the horizontal pull rod is optimally designed under the condition that the safety coefficient and the strength requirement are ensured; the purpose of reducing the cost is achieved.
Description
Technical field
The present invention relates to BF Design field, specifically a kind of method for designing of blast-furnace hot-air surrounding pipes girt.
Background technology
For a long time, the section structural of blast furnace system has all selected enough large size when designing, the rigidity of a lot of structure, intensity are all far beyond required safety coefficient, its reliability is mathematical, but, there is very large redundancy in the physical dimension that the reliability of superelevation but causes material, causes the waste of material and the raising of cost.
The section structural of blast furnace system does not pass through rational design analysis, the basis of original empirical value is designed, project planner does not understand this structure and is in any safe condition, do not know its physical dimension and capacity of equipment exist how many redundancies, it is all the related data with reference to old drawing when therefore doing new engineering design at every turn, optimization can not be made to dependency structure and capacity of equipment, the designing quality of drawing can not be improved, finally cause engineering cost to remain high.
Lack relevant design analysis and just can not make corresponding optimization to working drawing, which results in design level and remain where one is on the basis of old drawing many years ago, designing quality can not be improved, and can not adapt to the requirement of new situations.
The girt of blast-furnace hot-air surrounding pipes is owing to being subject to the impact of hot blast main pipe blind flange force and the distortion of bustle pipe High Temperature High Pressure, and its stressing conditions is very complicated.The design of pull bar can carry out computational analysis with finite element software, but due to the complicacy of software and the stressed complicacy of pull bar, only have the personnel through specialized training could obtain design result after the analysis taken time and effort, general project planner is difficult to grasp this method for designing.
Summary of the invention
In order to the part-structure overcoming blast furnace system in prior art to cause waste of material and the higher deficiency of cost without optimization, the invention provides a kind of method for designing of blast-furnace hot-air surrounding pipes girt, under the prerequisite ensureing safety coefficient and requirement of strength, the material of pull bar and dimensional structure are optimized, reach the object reduced costs.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method for designing of blast-furnace hot-air surrounding pipes girt, comprises the following steps: the acting force that the distortion of the acting force that step 1, the blast calculating hot blast main pipe produce pull bar and calculating bustle pipe produces pull bar; Step 2, calculate the maximum force suffered by single pull bar according to step 1 result of calculation; The size of step 3, maximum force suffered by single pull bar, determines the diameter of pull bar.
Further, step 1 comprises: the hot blast in step 1.1a, calculating hot blast main pipe is to the blind flange force of bustle pipe, and the computing formula of this blind flange force is
f
mBfor blind flange force, unit is N; d
0for the internal diameter of hot blast main pipe, unit is mm; P is hot-blast pressure, and unit is MPa.
Further, step 1 also comprises: the maximum force that in step 1.1b, calculating hot blast main pipe, hot-blast pressure P produces single pull bar, the computing formula of this maximum force is
f
dMBfor the maximum force that hot-blast pressure P in hot blast main pipe produces single pull bar, unit is N; α
1... α
nfor the angle of each pull bar and hot blast main pipe, unit is degree.
Further, step 1 comprises: the deflection of external diameter under set pressure effect of step 1.2a, calculating bustle pipe, the Deformation calculation formula of this bustle pipe under set pressure effect is
Δ d
1for the deflection of bustle pipe under set pressure effect, unit is mm; D
0for the central diameter of bustle pipe, unit is mm; D is the internal diameter of bustle pipe, and unit is mm; δ is the wall thickness of bustle pipe, and unit is mm; E is the elastic modulus that the material of bustle pipe is corresponding, and unit is MPa.
Further, step 1 also comprises: the deflection of external diameter under design temperature effect of step 1.2b, calculating bustle pipe, the computing formula of the deflection of external diameter under design temperature effect of this bustle pipe is
Δ d
2for the deflection of external diameter under design temperature effect of bustle pipe, unit mm; α is the linear expansion coefficient that the material of bustle pipe is corresponding, and unit is 1/ DEG C; T
1for the installation temperature of bustle pipe, unit is DEG C; T
2for the working temperature of bustle pipe, unit is DEG C.
Further, step 1 also comprises: the one-sided total deformation of the external diameter of step 1.2c, calculating bustle pipe, the computing formula of this total deformation is
Δ R is total deformation, and unit is mm.
Further, step 1 also comprises: step 1.2d, calculating bustle pipe one-sided total deformation correspondence produce the pure pressure of equivalent variations, and the computing formula of this pure pressure is
p
zfor bustle pipe one-sided total deformation correspondence produces the pure pressure of equivalent variations, unit is MPa; Δ l is the dilatational strain amount of the bustle pipe that structure and installation factor can absorb, and unit is mm.
Further, step 1 also comprises: the acting force that bustle pipe distortion needs provide offset by step 1.2e, calculating pull bar, and the computing formula of this acting force is F
bX=P
zab, F
bXoffset bustle pipe for pull bar and be out of shape the acting force needing to provide, unit is N; A is the length of the bearing of pull bar and the surface of contact of bustle pipe, and unit is mm; B is the width of the bearing of pull bar and the surface of contact of bustle pipe, and unit is mm.
Further, step 2 comprises the blast of offsetting hot blast in the bustle pipe distortion acting force that provides of needs and hot blast main pipe according to pull bar and calculates maximum force suffered by single pull bar to the maximum force that single pull bar produces, and the computing formula of the maximum force suffered by single pull bar is F
mAX=F
dMB+ F
bX, F
mAXfor the maximum force suffered by single pull bar, unit is N.
Further, step 3 comprises: step 3.1, the safety coefficient choosing pull bar and making material, and determines the permissible stress [σ] of pull bar; Step 3.2, determine the diameter of pull bar, the computing formula of this diameter is
for the diameter of pull bar, unit is mm.
The invention has the beneficial effects as follows, by the method for designing of blast-furnace hot-air surrounding pipes girt of the present invention, general designer can design the pull bar of blast-furnace hot-air surrounding pipes quickly and accurately, under the prerequisite ensureing safety coefficient and requirement of strength, to the dimensionally-optimised design of the materials and structures of girt, reach the object reduced costs.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the mounting arrangements schematic diagram of hot blast main pipe, bustle pipe, column and pull bar in the embodiment of the present invention.
Reference numeral in figure: 1, column; 2, pull bar; 3, hot blast main pipe; 4, bustle pipe.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The invention provides a kind of method for designing of blast-furnace hot-air surrounding pipes girt, comprise the following steps: the acting force that the distortion of the acting force that step 1, the blast calculating hot blast main pipe 3 produce pull bar 2 and calculating bustle pipe 4 produces pull bar 2; Step 2, calculate the maximum force suffered by single pull bar 2 according to step 1 result of calculation; The size of step 3, maximum force suffered by single pull bar 2, determines the diameter of pull bar 2.
By the method for designing of blast-furnace hot-air surrounding pipes girt of the present invention, general designer can design the pull bar 2 of blast-furnace hot-air surrounding pipes quickly and accurately, under the prerequisite ensureing safety coefficient and requirement of strength, to the dimensionally-optimised design of the materials and structures of pull bar 2, reach the object reduced costs.
Particularly, above-mentioned steps 1 comprises step 1.1a and step 1.1b.Specific as follows:
Hot blast in step 1.1a, calculating hot blast main pipe 3 is to the blind flange force of bustle pipe 4
d
0for the internal diameter of hot blast main pipe 3, the pressure of unit to be mm, P be hot blast, unit is MPa.It should be noted that, the temperature mentioning hot blast in the embodiment of the present invention is 1200 DEG C.
The maximum force that step 1.1b, the pressure P calculating hot blast in hot blast main pipe 3 produce single pull bar 2
α
1... α
nfor each pull bar 2 and the angle of hot blast main pipe 3, unit is degree.
Further, step 1 also comprises step 1.2a ~ step 1.2e, wherein,
The deflection of external diameter under set pressure effect of step 1.2a, calculating bustle pipe 4
d
0for the central diameter of bustle pipe 4, the internal diameter of unit to be mm, d be bustle pipe 4, the wall thickness of unit to be mm, δ be bustle pipe 4, the elastic modulus that the material of unit to be mm, E be bustle pipe 4 is corresponding, unit is MPa.
The deflection of external diameter under design temperature effect of step 1.2b, calculating bustle pipe 4
α is the linear expansion coefficient that the material of bustle pipe 4 is corresponding, and unit is 1/ DEG C, T
1for the installation temperature of bustle pipe 4, unit is DEG C, T
2for the working temperature of bustle pipe 4, unit is DEG C.
The one-sided total deformation of the external diameter of step 1.2c, calculating bustle pipe 4
Step 1.2d, calculating bustle pipe 4 one-sided total deformation correspondence produce the pure pressure of equivalent variations
Δ l is the dilatational strain amount of the bustle pipe 4 that structure and installation factor can absorb, and unit is mm.Wherein, the size of Δ l is the gap value that girt is reserved in installation process, and according to different erecting stagies and installation environment, the size of Δ l suitably can change between 2mm to 5mm.
Step 1.2e, calculating pull bar 2 are offset bustle pipe 4 and are out of shape the directed force F needing to provide
bX=P
zab, a are the length of the bearing of pull bar 2 and the surface of contact of bustle pipe 4, and the width of unit to be mm, b the be bearing of pull bar 2 and the surface of contact of bustle pipe 4, unit is mm.
It should be noted that, the distortion of the acting force that the blast calculating hot blast main pipe 3 produces pull bar 2 and calculating bustle pipe 4 to the order of operation of the acting force that pull bar 2 produces in no particular order.
Step 2 in the embodiment of the present invention comprises to be offset according to pull bar 2 blast that bustle pipe 4 is out of shape hot blast in the acting force that provides of needs and hot blast main pipe 3 and calculates maximum force F suffered by single pull bar to the maximum force that single pull bar 2 produces
mAX=F
dMB+ F
bX.
Further, step 3 comprises:
Step 3.1, the safety coefficient choosing pull bar 2 and making material, and determine the permissible stress [σ] of pull bar 2;
Step 3.2, determine the diameter of pull bar 2
Shown in composition graphs 1, introduce method for designing of the present invention for 8 pull bars 2 below.Bustle pipe 4 is connected with column 1 by pull bar 2, and above-mentioned hot blast main pipe 3 is arranged on bustle pipe 4.The diameter of the method for designing design pull bar 2 in the application embodiment of the present invention, wherein, the internal diameter d of hot blast main pipe 3
0for 2450mm, hot-blast pressure P is 0.5MPa, the angle α of each pull bar 2 and hot blast main pipe 3
1... α
nbe respectively 89 °, 19 °, 1 °, 71 °, 89 °, 19 °, 1 °, 71 °, the central diameter D of bustle pipe 4
0for 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 4
1be 20 DEG C, the work temperature of bustle pipe 4
2be 200 DEG C, the length a of the bearing of pull bar 2 and the surface of contact of bustle pipe 4 is 600mm, and the width b of the bearing of pull bar 2 and the surface of contact of bustle pipe 4 is 400mm.
First, according to step 1.1a, by the internal diameter d of hot-blast pressure P and hot blast main pipe 3
0substitute into formula
calculating the blind flange force size of the hot blast in hot blast main pipe 3 to bustle pipe 4 is 2.357 × 10
6n.
According to step 1.1b, by the angle α of each pull bar 2 with hot blast main pipe 3
1... α
nsubstitute into formula
the pressure P calculating hot blast in hot blast main pipe 3 is 2.575 × 10 to the maximum force size that single pull bar 2 produces
5n.
Secondly, according to step 1.2a, by the internal diameter d of bustle pipe 4, the wall thickness δ of bustle pipe 4 and elastic modulus E corresponding to the material of bustle pipe 4 are updated to formula
in, the deflection size of external diameter under set pressure effect calculating bustle pipe 4 is 0.45mm.
Further, determine that the linear expansion coefficient α size that the material of bustle pipe 4 is corresponding is 1.3 × 10
-5/ DEG C, and by the installation temperature T of bustle pipe 4
1with the work temperature of bustle pipe 4
2substitute into formula
calculate the deflection 11.48mm of external diameter under design temperature effect of bustle pipe 4.
According to step 1.2c, the one-sided total deformation size calculating external diameter is 5.96mm.
According to step 1.2d, determine that the size of the dilatational strain amount Δ l of the bustle pipe 4 that structure and installation factor can absorb is 4mm, and this dilatational strain amount Δ l is substituted into formula
the pure pressure size calculating bustle pipe 4 one-sided total deformation correspondence generation equivalent variations is 1.36MPa.
According to step 1.2e, the width b of the bearing of pull bar 2 and the length a of surface of contact of bustle pipe 4 and the surface of contact of the bearing of pull bar 2 and bustle pipe 4 is substituted into formula F
bX=P
zab, calculates pull bar 2 and offsets bustle pipe 4 and be out of shape and need the amount of force that provides to be 8.57 × 10
4n.Again, calculating according to step 2 the maximum force size calculated suffered by single pull bar is 3.43 × 10
5n.
The safety coefficient grade of the pull bar 2 in the embodiment of the present invention is 2, and making material is 35 steel modifier treatment.Therefore, permissible stress [σ] size drawing pull bar 2 of tabling look-up is 147.5MPa, according to step 3.2, above-mentioned numerical value is substituted into formula
the diameter value size that can calculate pull bar 2 is 54.43mm.
The diameter of pull bar 2 can choose the round values closest to critical value, i.e. d=55mm, but considers the concrete condition that ironmaking is on-the-spot, pull bar diameter suitably can be increased by 25% to 35%, get d=70mm in the present invention.And in prior art, at the internal diameter d of hot blast main pipe 3
0, hot-blast pressure P, the angle α of each pull bar 2 and hot blast main pipe 3
1... α
n, the central diameter of bustle pipe 4, the internal diameter d of bustle pipe 4, the wall thickness δ of bustle pipe 4, the installation temperature T of bustle pipe 4
1, the working temperature of bustle pipe 4, the bearing of pull bar 2 and the length a of surface of contact of bustle pipe 4 and the surface of contact of the bearing of pull bar 2 and bustle pipe 4 the parameter homogeneous phase such as width b simultaneously, the diameter of the pull bar 2 chosen according to design experiences is in the past 110mm, as can be seen here, the diameter of the pull bar 2 that method for designing according to the present invention is designed is less, can cross the object reaching and save material.
Be applied in the middle of multiple Practical Project to the pull bar 2 adopting method for designing of the present invention to obtain, through the use of long-time (more than 2 years), prove that the pull bar 2 that method for designing of the present invention obtains can meet requirement in serviceable life, meet national safety standard.Therefore, under the prerequisite of national associated safety requirement can being met according to the pull bar 2 of the method for designing acquisition in the embodiment of the present invention, cost-saving object is reached.
From above description, can find out, the above embodiments of the present invention achieve following technique effect: by the method for designing of blast-furnace hot-air surrounding pipes girt of the present invention, general designer can design blast-furnace hot-air surrounding pipes girt quickly and accurately, under the prerequisite ensureing safety coefficient and requirement of strength, to the dimensionally-optimised design of the materials and structures of girt, reach the object reduced costs.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a method for designing for blast-furnace hot-air surrounding pipes girt, is characterized in that, comprises the following steps:
The acting force that step 1, acting force that the blast calculating hot blast main pipe (3) produces pull bar (2) and the distortion calculating bustle pipe (4) produce pull bar (2);
Step 2, to calculate maximum force suffered by single pull bar (2) according to step 1 result of calculation;
The size of step 3, maximum force suffered by single pull bar (2), determines the diameter of pull bar (2).
2. the method for designing of blast-furnace hot-air surrounding pipes girt according to claim 1, is characterized in that, described step 1 comprises:
Hot blast in step 1.1a, calculating hot blast main pipe (3) is to the blind flange force of bustle pipe (4), and the computing formula of this blind flange force is
f
mBfor blind flange force, unit is N; d
0for the internal diameter of hot blast main pipe (3), unit is mm; P is hot-blast pressure, and unit is MPa.
3. the method for designing of blast-furnace hot-air surrounding pipes girt according to claim 2, is characterized in that, described step 1 also comprises:
The maximum force that step 1.1b, calculating hot blast main pipe (3) interior hot-blast pressure P produce single pull bar (2), the computing formula of this maximum force is
f
dMBfor the maximum force that hot blast main pipe (3) interior hot-blast pressure P produces single pull bar (2), unit is N; α
1... α
nfor each pull bar (2) and the angle of hot blast main pipe (3), unit is degree.
4. the method for designing of blast-furnace hot-air surrounding pipes girt according to claim 3, is characterized in that, described step 1 comprises:
The deflection of external diameter under set pressure effect of step 1.2a, calculating bustle pipe (4), the Deformation calculation formula of this bustle pipe (4) under set pressure effect is
Δ d
1for bustle pipe (4) deflection under set pressure effect, unit is mm; D
0for 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 elastic modulus that the material of bustle pipe (4) is corresponding, and unit is MPa.
5. the method for designing of blast-furnace hot-air surrounding pipes girt according to claim 4, is characterized in that, described step 1 also comprises:
The deflection of external diameter under design temperature effect of step 1.2b, calculating bustle pipe (4), the computing formula of the deflection of external diameter under design temperature effect of this bustle pipe (4) is
Δ d
2for the deflection of external diameter under design temperature effect of bustle pipe (4), unit mm; α is the linear expansion coefficient that the material of bustle pipe (4) is corresponding, and unit is 1/ DEG C; T
1for the installation temperature of bustle pipe, unit is DEG C; T
2for the working temperature of bustle pipe, unit is DEG C.
6. the method for designing of blast-furnace hot-air surrounding pipes girt according to claim 5, is characterized in that, described step 1 also comprises:
The one-sided total deformation of the external diameter of step 1.2c, calculating bustle pipe (4), the computing formula of this total deformation is
Δ R is total deformation, and unit is mm.
7. the method for designing of blast-furnace hot-air surrounding pipes girt according to claim 6, is characterized in that, described step 1 also comprises:
Step 1.2d, calculating bustle pipe (4) one-sided total deformation correspondence produce the pure pressure of equivalent variations, and the computing formula of this pure pressure is
pZ is the pure pressure that bustle pipe (4) one-sided total deformation correspondence produces equivalent variations, and unit is MPa; Δ l is the dilatational strain amount of the bustle pipe (4) that structure and installation factor can absorb, and unit is mm.
8. the method for designing of blast-furnace hot-air surrounding pipes girt according to claim 7, is characterized in that, described step 1 also comprises:
The acting force that bustle pipe (4) distortion needs to provide is offset in step 1.2e, calculating pull bar (2), and the computing formula of this acting force is F
bX=P
zab, F
bXoffset bustle pipe (4) for pull bar (2) and be out of shape the acting force needing to provide, unit is N; A is the length of the bearing of pull bar (2) and the surface of contact of bustle pipe (4), and unit is mm; B is the width of the bearing of pull bar (2) and the surface of contact of bustle pipe (4), and unit is mm.
9. the method for designing of blast-furnace hot-air surrounding pipes girt according to claim 8, it is characterized in that, described step 2 comprises the blast of offsetting bustle pipe (4) the distortion acting force that provides of needs and hot blast main pipe (3) interior hot blast according to pull bar (2) and calculates maximum force suffered by single pull bar (2) to the maximum force that single pull bar (2) produces, and the computing formula of the maximum force suffered by single pull bar (2) is F
mAX=F
dMB+ F
bX, F
mAXfor the maximum force suffered by single pull bar (2), unit is N.
10. the method for designing of blast-furnace hot-air surrounding pipes girt according to claim 9, is characterized in that, described step 3 comprises:
Step 3.1, the safety coefficient choosing pull bar (2) and making material, and determine the permissible stress [σ] of pull bar (2);
Step 3.2, determine the diameter of pull bar (2), the computing formula of this diameter is
d is the diameter of pull bar (2), and unit is mm.
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| CN201410643385.3A CN104392120B (en) | 2014-11-07 | 2014-11-07 | The design method of blast-furnace hot-air surrounding pipes girt |
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| CN104392120B CN104392120B (en) | 2017-07-21 |
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| CN104392120B (en) | 2017-07-21 |
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