CN102758039A - Method for quantitatively evaluating activity of tuyere convolute region - Google Patents

Abstract

The invention relates to a method for quantitatively evaluating activity of a tuyere convolute region. In the method, the depth DR of the tuyere convolute region, the width WR of the tuyere convolute region, the sectional area A of the convolute region, the sectional area B of the adjacent tuyere and the sectional area Sdead of a dead material column are calculated through the basic parameters of the tuyere convolute region of a blast furnace; and the activity index AIR of the tuyere convolute region of the blast furnace is calculated through a formula. According to the method, the defect of mismatch of the original 'blasting kinetic energy' index and the shape characteristic of the convolute region is overcome; the activity index of the tuyere convolute region and the depth of the convolute region basically form a one-to-one correspondence relationship; the active degree and the existing state of the tuyere convolute region and an air-permeating and liquid-permeating channel on the lower part are reflected accurately, reasonably and effectively; and important judgment basis and technical basis are provided for a regulating agent on the lower part of the blast furnace.

Description

Circle round and distinguish the method for activity in a kind of quantitative evaluation air port

Technical field

The present invention relates to a kind of quantitative evaluation air port circle round the district activity method, belong to blast furnace operating field in the smelting iron and steel.

Background technology

The gas flow characteristics determined of blast-furnace tuyere at the initial distribution of lower coal air-flow; And then directly influence the reduction of the alternate quality of gas-solid, momentum and control transfer of heat and iron-containing charge in the stove from the source; Therefore investigating air port gas flow characteristic is to optimize the foundation stone of coal gas distributions in the stove, significant to the yield and quality index of improving blast furnace.And in the blast furnace actual production process; The circle round shape facility in district of air port has reflected the gas flow characteristic in air port; And directly having influence on furnace charge stable smooth operation, coal gas stream and the reasonable distribution of temperature and the activity of cupola well, is the indispensable important reaction zone of blast furnace stable operation.

Distinguish the changing conditions of shape facility through judging that with the size of blast energy blast-furnace tuyere circles round generally speaking, and then the distribution trend that coal gas flows in the analytical furnace.Blast energy is too small, and then the district of circling round, air port is less, original coal air-flow deflection marginal distribution; Blast energy is excessive, then the air port circle round the district bigger, the original coal air-flow is the center developing state.The calculating formula difference of the blast energy E and the district's shape facility that circles round is shown in (7) and formula (8).

$E=\frac{1}{2}\×\frac{[4\×(0.21+x_{O_2})+28]/22.4+f/1000}{g}\×{\left(\frac{V_b+O_2/60}{60}\right)}^3$

(7)

$\×{(1+\frac{22.4\×f}{18000})}^2\×{\left(\frac{1033}{1033+P_b}\right)}^2\×{\left(\frac{273+t_b}{273}\right)}^2\×\frac{1}{n^3\×{(\mathrm{\π}/4\×{D_T}^2)}^2}$

$\frac{D_R}{D_T}=0.315\×{(\frac{{\mathrm{\ρ}}_0}{{\mathrm{\ρ}}_s\×D_P}\×{\left(\frac{V_g}{S_T}\right)}^2\×\frac{T_r}{P_b\×298}\×\frac{1}{g})}^{0.567}---\left(8\right)$

In the following formula:

is oxygen enrichment percentage, and unit is %;

F is a blast humidity, and unit is gNm ^-3Dry-air blast;

O ₂Be the oxygen enrichment flow, unit is Nm ³H ^-1

D _TBe tuyere diameter, unit is m;

N is the work inlet number;

V _bBe the dry-air blast amount, unit is Nm ³Min ^-1

t _bBe blast temperature, unit is ℃;

E is a blast energy, and unit is kgms ^-1

D _RBe the district's degree of depth of circling round, unit is m;

ρ ₀Be the density of bosh coal gas under standard state, unit is kgNm ^-1

ρ _sBe coke density, unit is kgm ^-3

D _PBe the burnt diameter in air port, unit is m;

S _TBe the air port total area, unit is m ²

T _rBe theoretical combustion temperature, unit is K;

G is a universal gravity constant, and value is 9.81ms ^-2

The reasonable distribution that the district's shape facility that circles round changes original coal air-flow even whole gas fluid in blast furnace plays crucial effects, and then influences the improvement of blast furnace ordinary production and each economic target.Evaluation index that district's shape facility changes can reflect the reasonableness of the district's shape size of circling round from the side to use blast-furnace tuyere to circle round, and adjusts with this accurate instruction bottom house.Yet; Original blast energy circles round as the sign blast-furnace tuyere and distinguishes the index that shape facility changes; There is certain weak point; Promptly can keep identical blast energy through adjusting different air blast parameters, and obtain the different district's shape facilities that circles round, there is unmatched defective in blast energy with the district's shape facility that circles round.Thus, need the more reasonable and proper new evaluation of proposition to circle round and distinguish the index that shape facility changes, adjust with the accurate instruction bottom house.

Summary of the invention

The technical problem that the present invention will solve is: the method that provides a kind of quantitative evaluation air port to circle round district's activity; It can effectively be avoided existing " blast energy " index and circle round the defective that do not match of district's shape facility; And then accurately, reasonably reflect air port the circle round active degree and the existence in district, for instructing bottom house to adjust important basis for estimation and technical foundation is provided.

In order to solve the problems of the technologies described above, the present invention provides a kind of quantitative evaluation air port to circle round and distinguishes the method for activity, and it may further comprise the steps:

1), establishes and detect to such an extent that the tuyere diameter in the district of circling round to the air port is D through the scene _T, the air port total area is S _T, air port pressure is P _b, theoretical combustion temperature is T _r, bosh coal gas volume is V under the standard state _g, the cupola well diameter is D ₂, the district place coke density of circling round is ρ _s, the district place coke diameter that circles round is D _PThe density of bosh coal gas under standard state is ρ ₀

2), adopt following the formula calculating air port district's depth D of circling round _RWith the air port sector width W that circles round _R:

$\frac{D_R}{D_T}=0.315\×{(\frac{{\mathrm{\ρ}}_0}{{\mathrm{\ρ}}_s\×D_P}\×{\left(\frac{V_g}{S_T}\right)}^2\×\frac{T_r}{P_b\×298}\×\frac{1}{g})}^{0.567}---\left(1\right)$

$\frac{W_R}{D_T}=2.631\×{\left(\frac{D_R}{d}\right)}^{0.331}---\left(2\right)$

3), according to following formula calculate the district basal area A that circles round, area B and dead stock column basal area S are interrupted in adjacent air port _Dead:

$A=38\×(\frac{1}{2}\×(D_T+W_R)\×\frac{1}{2}\×D_R+\frac{1}{2}\×\mathrm{\π}\×\frac{1}{2}\×D_R\×W_R)---\left(3\right)$

B＝π×D ₂×D ₂/4-π×(D ₂-D _R×2)×(D ₂-D _R×2)/4-A (4)

S _dead＝π×(D ₂-2×D _R) ²/4 (5)

4), calculate the blast-furnace tuyere district activity Index A IR that circles round according to following formula:

$\mathrm{AIR}=\frac{B}{S}+\frac{n\×W_R}{\mathrm{\π}\×D_2}---\left(6\right)$

Wherein, more than various in,

D _RBe the district's degree of depth of circling round, unit is m;

D _TBe tuyere diameter, unit is m;

ρ ₀Be the density of bosh coal gas under standard state, unit is kgNm ^-1

ρ _sBe coke density, unit is kgm ^-3

D _PBe the burnt diameter in air port, unit is m;

V _gBe the volume of bosh coal gas under standard state, unit is Nm ³Min ^-1

S _TBe the air port total area, unit is m ²

T _rBe theoretical combustion temperature, unit is K;

P _bBe blast furnace blast pressure, unit is Pa;

G is a universal gravity constant, and value is got 9.81ms ^-2

W _RBe the sector width that circles round, unit is m;

D is the air port mean diameter, and unit is m;

A is the district's basal area of circling round, and unit is m ²

B is that area is interrupted in adjacent air port, and unit is m ²

D ₂Be the cupola well diameter, unit is m;

S is a hearth area, and unit is m ²

N is the air port number;

W _RBe the air port sector width that circles round, unit is m.

Be preferably said tuyere diameter D _TScope be 120mm～140mm, said air port total area S _TScope be 0.4～0.5m ²Said cupola well diameter is D ₂Scope be 14m～15m.Said air port pressure P _bScope be 380～450kPa; Said theoretical combustion temperature T _rScope be 1900 ℃～2300 ℃; Bosh coal gas volume V under the said standard state _gScope be 9000～11000m ³/ min.

Circle round and distinguish the method for activity in quantitative evaluation of the present invention air port; Overcome original " blast energy " index and the not matching property defective of the district's shape facility that circles round; The air port district's activity index that circles round is relation one to one basically with the district's degree of depth of circling round; Accurately, rationally, effectively reflected circle round district and the bottom is ventilative, pass through the active degree and the existence of liquid passage, air port, important basis for estimation and technical foundation is provided for instructing bottom house to adjust.

Description of drawings

Fig. 1 is each area schematic of the following coke of blast furnace melting with soft:

Fig. 2 is inlet horizontal face shown in Figure 1 place each area schematic of cupola well section;

Fig. 3 circles round and distinguishes corresponding relation figure between the activity index for the circle round district degree of depth and air port, air port;

Fig. 4 to Fig. 7 is the permeability index K value in certain 1 year four season of blast furnace and the internal relation synoptic diagram between " circling round and distinguish the activity index in the air port ".

Embodiment

Below, combine accompanying drawing that the present invention is made more detailed description with embodiment.Present embodiment only is the description to best mode for carrying out the invention, scope of the present invention is not had any restriction.

Embodiment

As shown in Figure 1, the coke below the whole blast furnace melting with soft can be divided into three zones: to coke main flow area 11, coke slow-action district 12 and the dead stock column 13 of the district's feed that circles round.Wherein, D ₁For putting to death the diameter of stock columns 13 bottom surfaces, D in the district 14 of circling round, air port ₂Be the cupola well diameter, therefore, (D ₂-D ₁)/2 are the district's depth D of circling round _R, its value is big more, and then corresponding coke main flow area 11 is big more, and dead stock column 13 is just more little, and is ventilative, pass through the liquid passage and increase gradually, helps uniform distribution and the heat transfer between coal gas and the furnace charge of burden direct motion, coal gas stream, the carrying out of mass transfer process.

As shown in Figure 2, be the cross sectional representation at place, Fig. 1 apoplexy saliva plane.The air port circle round the district horizontal direction the top be dead stock column, its area is made as S _Dead, it ventilative, to pass through the liquid effect very little, can ignore.In addition, because the effect of high velocity air, circle round to distinguish and self do not possess the effect through slag iron basically in the air port; Therefore, on the cupola well cross section at inlet horizontal face place, have on the good zone of passing through the liquid effect should circle round section between the district in adjacent air port; Be that area is interrupted in adjacent air port, be set at B.Coal gas is after the inner generation in the district of circling round, and most of top of circling round district's xsect from the air port sees through, and is set at A.

Approximate derivation inlet horizontal face place each regional area of cupola well section:

1. district basal area A circles round.Approximate thinking circle round district's basal area be equal to trapezoidal and a semiellipse area with.Wherein, trapezoidal with the air port sector width W that circles round _RWith tuyere diameter be the end, it highly is the air port district's depth D of circling round _RHalf the, and semiellipse is with the sector width W that circles round _RBe minor axis, its major axis is the district's depth D of circling round _RHalf the.Calculating formula is suc as formula shown in (3).

$A=38\×(\frac{1}{2}\×(D_T+W_R)\×\frac{1}{2}\×D_R+\frac{1}{2}\×\mathrm{\π}\×\frac{1}{2}\×D_R\×W_R)---\left(3\right)$

2. area B is interrupted in adjacent air port.Calculating formula is suc as formula shown in (4).

B＝π×D ₂×D ₂/4-π×(D ₂-D _R×2)×(D ₂-D _R×2)/4-A (4)

3. dead stock column basal area S _DeadCalculating formula is suc as formula shown in (5).

S _dead＝π×(D ₂-2×D _R) ²/4 (5)

Calculate the blast-furnace tuyere district activity Index A IR that circles round according to calculating formula (6).

$\mathrm{AIR}=\frac{B}{S}+\frac{n\×W_R}{\mathrm{\π}\×D_2}---\left(6\right)$

AIR in the formula---blast-furnace tuyere circles round and distinguishes the activity index;

B---area is interrupted in adjacent air port, and unit is m ²

S---hearth area, unit are m ²

N---air port number;

be expressed as the circle round ratio of sector width and cupola well girth of total air port, characterized air port circle round " ventilation property " on place, the district cupola well xsect.That sum of the two has been taken into account is ventilative, pass through the net effect of liquid passage on range (area) and intensity (degree of depth or width), has reflected that the air blast parameter is to circle round district's shape facility and the bottom is ventilative, the liquid passage influences rule thoroughly of blast-furnace tuyere.Is example with the air port district's activity index that circles round with the district's degree of depth of circling round, and is illustrated in figure 3 as corresponding relation figure between the two.

From Fig. 3, can see; District's activity index is circled round as the circle round evaluation index of district's shape facility of sign in the air port of using the present invention to propose; Overcome original " blast energy " index and the not matching property defective of the district's shape facility that circles round; The air port district's activity index that circles round is relation one to one basically with the district's degree of depth of circling round, and accurately, rationally, has effectively reflected the active degree and the existence that circle round at the air port district and bottom are ventilative, pass through the liquid passage.

Shown in Fig. 4 to 7, be the permeability index K value in certain 1 year four season of blast furnace and internal relation statistics and the parsing between " circling round and distinguish the activity index in the air port ".Can see that from figure " circling round and distinguish the activity index in the air port " presents very good negative correlation with permeability index K value, promptly the AIR index is big more, and then blast furnace permeability is good more, and permeability index K value is low more, and vice versa.The good of variation tendency coincide between blast furnace permeability index K value and the AIR index; Reflected that the circle round variation ventilation property ventilative to the bottom, that pass through in liquid passage and the whole stove of district's shape facility of air port has tangible effect, also confirmed that " air port circle round district's activity index " circle round as characterizing blast-furnace tuyere that district's shape facility changes and the feasibility of activity simultaneously.

Claims (3)

1. circle round and distinguish the method for activity in a quantitative evaluation air port, it is characterized in that: may further comprise the steps:

1), establishes and detect to such an extent that the tuyere diameter in the district of circling round to the air port is D through the scene _T, the air port total area is S _T, air port pressure is P _b, theoretical combustion temperature is T _r, bosh coal gas volume is V under the standard state _g, the cupola well diameter is D ₂, the district place coke density of circling round is ρ _s, the district place coke diameter that circles round is D _PThe density of bosh coal gas under standard state is ρ ₀

2), adopt following the formula calculating air port district's depth D of circling round _RWith the air port sector width W that circles round _R:

$\frac{D_R}{D_T}=0.315\×{(\frac{{\mathrm{\ρ}}_0}{{\mathrm{\ρ}}_s\×D_P}\×{\left(\frac{V_g}{S_T}\right)}^2\×\frac{T_r}{P_b\×298}\×\frac{1}{g})}^{0.567}---\left(8\right)$

$\frac{W_R}{D_T}=2.631\×{\left(\frac{D_R}{d}\right)}^{0.331}---\left(2\right)$

3), according to following formula calculate the district basal area A that circles round, area B and dead stock column basal area S are interrupted in adjacent air port _Dead:

$A=38\×(\frac{1}{2}\×(D_T+W_R)\×\frac{1}{2}\×D_R+\frac{1}{2}\×\mathrm{\π}\×\frac{1}{2}\×D_R\×W_R)---\left(3\right)$

B＝π×D ₂×D ₂/4-π×(D ₂-D _R×2)×(D ₂-D _R×2)/4-A (4)

S _dead＝π×(D ₁-2×D _R) ²/4(5)

4), calculate the blast-furnace tuyere district activity Index A IR that circles round according to following formula:

$\mathrm{AIR}=\frac{B}{S}+\frac{n\×W_R}{\mathrm{\π}\×D_2}---\left(6\right)$

Wherein, more than various in,

D _RBe the district's degree of depth of circling round, unit is m;

D _TBe tuyere diameter, unit is m;

ρ ₀Be the density of bosh coal gas under standard state, unit is kgNm ^-1

ρ _sBe coke density, unit is kgm ^-3

D _PBe the burnt diameter in air port, unit is m;

V _gBe the volume of bosh coal gas under standard state, unit is Nm ³Min ^-1

S _TBe the air port total area, unit is m ²

T _rBe theoretical combustion temperature, unit is K;

P _bBe blast furnace blast pressure, unit is Pa;

G is a universal gravity constant, and value is got 9.81ms ^-2

W _RBe the sector width that circles round, unit is m;

D is the air port mean diameter, and unit is m;

A is the district's basal area of circling round, and unit is m ²

B is that area is interrupted in adjacent air port, and unit is m ²

D ₂Be the cupola well diameter, unit is m;

S is a hearth area, and unit is m ²

N is the air port number;

W _RBe the air port sector width that circles round, unit is m.

2. circling round and distinguish the method for activity in quantitative evaluation according to claim 1 air port, it is characterized in that: said tuyere diameter D _TScope be 120mm～140mm, said air port total area S _TScope be 0.4～0.5m ²Said cupola well diameter is D ₂Scope be 14m～15m.

3. circling round and distinguish the method for activity in quantitative evaluation according to claim 1 air port, it is characterized in that: said air port pressure P _bScope be 380～450kPa; Said theoretical combustion temperature T _rScope be 1900 ℃～2300 ℃; Bosh coal gas volume V under the said standard state _gScope be 9000～11000m ³/ min.

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