CN102952910B - Calculation method of energy utilization after addition of high-reactivity coke into blast furnace - Google Patents
Calculation method of energy utilization after addition of high-reactivity coke into blast furnace Download PDFInfo
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- CN102952910B CN102952910B CN201210420813.7A CN201210420813A CN102952910B CN 102952910 B CN102952910 B CN 102952910B CN 201210420813 A CN201210420813 A CN 201210420813A CN 102952910 B CN102952910 B CN 102952910B
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- coke
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Abstract
The invention relates to and constructs a calculation method of energy utilization after addition of high-reactivity coke into a blast furnace. The method comprises division of a heat reservation section of the blast furnace, changes of indirect reduction degree of the overall blast furnace and changes of coke reduction quantity, and lays theoretical foundations for the usage of high-reactivity coke by the blast furnace. The method specifically comprises division of a heat reservation section of the blast furnace, changes of indirect reduction degree of the overall blast furnace and changes of coke reduction quantity. The method provided by the invention provides theoretical and calculation basis for quantitative analysis of influences of high-reactivity coke on blast furnace process parameters, and lays theoretical foundations for the usage of high-reactivity coke by the blast furnace.
Description
Technical field
The present invention relates to build a kind of about blast furnace with addition of high capacity of furnace utilizes after hyperergy coke method of calculation, comprising the division in blast furnace hot reserve district, the whole indirect reduction degree of blast furnace, change and save burnt quantitative change, for blast furnace is used hyperergy coke based theoretical.
Background technology
Adopt search condition: summary=(blast furnace) AND summary=(hyperergy coke); Or, summary=(blast furnace) AND summary=(energy utilization); And abstract=(blast furnace) AND abstract=(high reactivity coke) database is at home and abroad retrieved.Through carefully retrieval, do not have and originally declare the same or similar summary of the invention of patent.
Coke is the main fuel of blast-furnace smelting, be not only the source of heat, reductive agent and the carburizing agent of blast-furnace smelting, what is more important plays the effect of skeleton and gas flue in blast furnace, therefore requires blast-furnace coke not only to meet the requirement of granularity, and cold and hot state intensity wants high simultaneously.Because coke occurs after the reaction of carbon element melting loss in blast furnace, its intensity sharply reduces, so blast furnace requires the reactivity of coke low, post-reaction strength wants high.Based on this understanding, very long one period blast furnace fail to use hyperergy coke, entering higher broken Jiao of granularity <25mm reactivity that stokehold screening obtains and after fragmentation, be used as sintering fuel use, is that resource use or economic benefit aspect are all quite unreasonable like this.
At present, existing a lot of enterprises are being used nut coke both at home and abroad, and major part is all produced and brought good effect blast furnace.Pass through theoretical analysis, can learn the coke (cinder coal on traditional concept) that uses easy generating gasification reaction, as small grain size coke or hyperergy coke, can promote the gasification reaction of shaft position carbon, thereby increase the CO concentration in hot reserve district Gas Flow, improve reduction reaction rate, the endothermic effect of gasification reaction can reduce again hot reserve district temperature simultaneously, the required CO equilibrium concentration of FeO that makes to reduce reduces, as shown in Figure 1.Above-mentioned both coefficient results, by making to reduce in shaft hot reserve district thermodynamics, the dynamic conditions of FeO, obtain obviously and improve, thereby make the iron-containing charge in this region be reduced out more metal Fe, thereby promote the development of the indirect reduction reaction of this region iron, the direct reduction reactor degree of blast furnace integral body is reduced.
Yet above analysis is only confined to analyze qualitatively, cannot learn after hyperergy coke, the concrete variation tendency of the direct-reduction degree of blast furnace, indirect reduction degree, efficiency of shaft, fuel ratio, be difficult to establish the theoretical basis of this technique, affected the quantitative resolution to this technological process, cannot accurate instruction technological design and production operation.
Summary of the invention
The method of calculation that the object of the present invention is to provide a kind of blast furnace to utilize with addition of energy after hyperergy coke.
Technical scheme of the present invention is as follows: the method for calculation that a kind of blast furnace utilizes with addition of energy after hyperergy coke, and the whole indirect reduction degree of division, blast furnace that has comprised blast furnace hot reserve district changes and saves burnt quantitative change; Circular is as follows:
First blast furnace hot reserve district and high-temperature zone are divided: the gas temperature of hot reserve district lower boundary is 1000 ℃, 950 ℃ of solid charge temperature, 950 ℃ of the gas temperatures of coboundary, hot reserve district, 900 ℃ of solid charge temperature, the boundary gas temperature in high-temperature zone and hot reserve district is 1000 ℃; High-temperature zone comprises convolution district, air port and direct-reduction band; While not adding hyperergy coke, think that FeO and CO and H have only occurred in hot reserve district
2indirect reduction;
Secondly, present method, on the basis of traditional blast furnace material balance and heat calculation, is considered the impact that causes with addition of hyperergy coke in blast furnace, sets up blast furnace with addition of hyperergy coke theoretical calculation model; Analyse in depth with addition of material in blast furnace after hyperergy coke, change and energy variation basis on, set up high-temperature zone, hot reserve district combined calculation iteration module, supposing H
2on the basis that reduction degree does not change, calculate blast furnace with addition of the variation of indirect reduction degree after hyperergy coke;
Concrete high-temperature zone and hot reserve district combined calculation method are as follows: during model calculates, CO source in hot reserve district mainly contains three aspects:, in Yi Shi hot reserve district, and the reaction of hyperergy coke generating gasification, the CO of generation; In Er Shi hot reserve district, the gasification reaction of hyperergy coke impels FeO that direct-reduction occurs, the CO that direct-reduction generates; The 3rd, leave high-temperature zone, bottom, enter the CO in hot reserve district; The CO source structure of this three aspects: the CO in hot reserve district, the temperature in Qi Yu hot reserve district combines, and can calculate the indirect reduction degree in hot reserve district, thereby draws high-temperature zone direct-reduction degree; And can obtain according to high-temperature zone direct-reduction degree the CO that high-temperature zone direct-reduction generates; This part CO is exactly the 3rd source of hot reserve district CO; The amount of these two portions CO is equated, then carry out loop iteration calculating, can obtain hot reserve interval and connect reducing degree; Utilize the direct-reduction degree in hot reserve district can obtain whole blast furnace direct-reduction degree, specifically calculation procedure is as shown in Figure 2:
Finally, by the introducing of theoretical coke ratio computing module, calculate blast furnace and save burnt quantitative change, therefore concrete grammar is as follows: model is all basis mutually with the variation of actual coke ratio and the variation tendency of theoretical coke ratio, uses the burnt amount of joint of blast furnace after hyperergy coke to be the variable quantity that blast furnace adds theoretical coke ratio before and after hyperergy coke; Wherein, the calculating of theoretical coke ratio, by setting up high-temperature zone thermal balance equation and high-temperature zone carbon and oxygen balance equation, solves the direct-reduction consumption carbon amount of burning consumption carbon amount and iron before air port, thereby obtains theoretical coke ratio;
The main formulas for calculating of theoretical coke ratio is as follows:
Carbon element equilibrium equation: K * C in blast furnace
k=C
b,k+ C
dFe+ C
da+ C
c+ C
hformula 1
Wherein, K: theoretical coke ratio
C
k: the carbon content in coke
C
b,k: combustion of coke amount before air port
C
dFe: direct-reduction consumption carbon amount in iron
C
da: silicomanganese phosphorus sulphur reduction consumption carbon
C
c: pig iron carburizing amount
C
h: hyperergy coke gasification consumption carbon
High-temperature zone thermal balance equation: q
c* C
b,k-(3030+q
k) * C
dFe=Q
hz1-C
b.m* q
c.hformula 2
Wherein, q
c: burning 1kg coke carbon element institute can offer the effectively comprehensive heat in high-temperature zone by z
Q
k: self heat dissipation of the coke of every kilogram of carbon element
Q
hz1: the known heat exhaustion item in high-temperature zone
Q
c.h: the comprehensive heat of burning 1kg carbon element before air port
High-temperature zone carbon and oxygen balance equation:
: the protohydrogen amount of going back that before air port, the air blast of burning 1kg carbon element is brought into
O
a2: ore is through floating contained oxygen amount of scholar's body stage
H
2r.m: the high-temperature zone of the pig iron per ton is from the protohydrogen amount of going back of coal dust
By two equations 2 and formula 3 simultaneous, form a linear equation in two unknowns group, contain two unknown numbers: the coke carbon element amount C of burning before air port
b.k, the direct-reduction of iron consumes carbon element amount C
dFe, simultaneous solution can be obtained their numerical value, brings formula 1 into and can determine theoretical coke ratio.
Method of the present invention provides theory and basis to the impact of blast furnace technology parameter for quantitative analysis hyperergy coke, for blast furnace is used hyperergy coke, has established theoretical basis.
Accompanying drawing explanation
The Balance Air phase composite of accompanying drawing 1:CO reducing iron oxides and the graph of a relation of temperature.
Accompanying drawing 2: the indirect reduction degree calculation flow chart in hot reserve district.
Accompanying drawing 3: the variation diagram of the theoretical coke ratio of blast furnace, actual coke ratio and natural fuel ratio under different hyperergy coke gasification reaction amounts.
Accompanying drawing 4: the variation diagram of the burnt amount of blast furnace joint under different hyperergy coke gasification reaction amounts.
Accompanying drawing 5: the variation diagram of blast furnace reduction degree under different hyperergy coke gasification reaction amounts.
Embodiment
Under different hyperergy coke gasification reaction amounts, high capacity of furnace utilizes the variation of index:
Month actual achievement production data of domestic certain blast furnace of take is basis, first carry out material balance and thermal balance calculating, and set up basic model, and by certain blast furnace actual production data, set up model is tested, then in this enterprising step in model basis, set up the blast furnace ironmaking innovation process calculation model with addition of hyperergy coke.As shown in Figure 2, the CO(V generating when the high-temperature zone calculating
2) CO(V that enters with high-temperature zone, bottom
1) absolute difference is greater than at 0.01 o'clock, by the V calculating
2return to and substitute original V
1proceed to calculate, so circulation, to calculation result V
2with V
1absolute difference is less than or equal at 0.01 o'clock jumps out circulation, the CO amount that output high-temperature zone enters, and with this, calculate hot reserve interval and connect reducing degree.Utilize the direct-reduction degree in hot reserve district can obtain whole blast furnace direct-reduction degree.Subsequently, by calculating, learn the variation of theoretical coke ratio under differential responses coke gasification reaction amount, and thinking in the variation of actual coke ratio and the variation tendency same basic of theoretical coke ratio, obtain the variation of actual coke ratio, finally draw the variation of fuel ratio.Calculation result is as shown in Fig. 3-Fig. 5.
As shown in Figure 3, be the variation of the theoretical coke ratio of blast furnace under different hyperergy coke gasification reaction amounts, actual coke ratio and natural fuel ratio.Along with the increase of hyperergy coke gasification reaction amount, theoretical coke ratio reduces gradually, and the burnt amount of joint increases.
As shown in Figure 4, be the burnt variation of measuring of blast furnace joint under different hyperergy coke gasification reaction amounts.Blast furnace is with addition of hyperergy coke, and the reacting weight of setting hyperergy coke is increased to 40kg/t by 0kg/t, and the burnt amount of joint increases to 16.8kg/t gradually, embodies hyperergy coke and saves preferably burnt effect.
As shown in Figure 5, be the variation of blast furnace reduction degree under different hyperergy coke gasification reaction amounts.Blast furnace is with addition of hyperergy coke, the reacting weight of setting hyperergy coke is increased to 40kg/t by 0kg/t, blast furnace direct-reduction degree is reduced to 0.37 by 0.44, CO indirect reduction degree rises to 0.51 by 0.44, with addition of hyperergy coke to reducing direct-reduction degree, promote indirect reduction degree and have unusual effect.
Claims (1)
1. the method for calculation that blast furnace utilizes with addition of energy after hyperergy coke, have comprised the calculating that the whole indirect reduction degree of division, blast furnace in blast furnace hot reserve district changes and the calculating that saves burnt quantitative change; Concrete grammar is as follows:
First blast furnace hot reserve district and high-temperature zone are divided: the gas temperature of hot reserve district lower boundary is 1000 ℃, 950 ℃ of solid charge temperature, 950 ℃ of the gas temperatures of coboundary, hot reserve district, 900 ℃ of solid charge temperature, the boundary gas temperature in high-temperature zone and hot reserve district is 1000 ℃; High-temperature zone comprises convolution district, air port and direct-reduction band; While not adding hyperergy coke, think that FeO and CO and H have only occurred in hot reserve district
2indirect reduction;
Secondly, present method is set up high-temperature zone, hot reserve district combined calculation iteration module, at hypothesis H
2on the basis that reduction degree does not change, calculate blast furnace with addition of the variation of indirect reduction degree after hyperergy coke; Concrete high-temperature zone and hot reserve district combined calculation method are as follows:
During model calculates, CO source in hot reserve district mainly contains three aspects:, in Yi Shi hot reserve district, and the reaction of hyperergy coke generating gasification, the CO of generation; In Er Shi hot reserve district, the gasification reaction of hyperergy coke impels FeO that direct-reduction occurs, the CO that direct-reduction generates; The 3rd, leave high-temperature zone, bottom, enter the CO in hot reserve district; The CO source structure of this three aspects: the CO in hot reserve district, the temperature in Qi Yu hot reserve district combines, and can calculate the indirect reduction degree in hot reserve district, thereby draws high-temperature zone direct-reduction degree; And can obtain according to high-temperature zone direct-reduction degree the CO that high-temperature zone direct-reduction generates; This part CO is exactly the 3rd source of hot reserve district CO; The amount of these two portions CO is equated, then carry out loop iteration calculating, can obtain hot reserve interval and connect reducing degree; Utilize the direct-reduction degree in hot reserve district can obtain whole blast furnace direct-reduction degree;
Finally, by the introducing of theoretical coke ratio computing module, calculate blast furnace and save burnt quantitative change, therefore concrete grammar is as follows: model is all basis mutually with the variation of actual coke ratio and the variation tendency of theoretical coke ratio, uses the burnt amount of joint of blast furnace after hyperergy coke to be the variable quantity that blast furnace adds theoretical coke ratio before and after hyperergy coke; Wherein, the calculating of theoretical coke ratio, by setting up high-temperature zone thermal balance equation and high-temperature zone carbon and oxygen balance equation, solves the direct-reduction consumption carbon amount of burning consumption carbon amount and iron before air port, thereby obtains theoretical coke ratio;
The main formulas for calculating of theoretical coke ratio is as follows:
Carbon element equilibrium equation: K * C in blast furnace
k=C
b.k+ C
dFe+ C
da+ C
c+ C
hformula 1
Wherein, K: theoretical coke ratio
C
k: the carbon content in coke
C
b.k: combustion of coke amount before air port
C
dFe: direct-reduction consumption carbon amount in iron
C
da: silicomanganese phosphorus sulphur reduction consumption carbon
C
c: pig iron carburizing amount
C
h: hyperergy coke gasification consumption carbon
High-temperature zone thermal balance equation: q
c* C
b.k-(3030+q
k) * C
dFe=Q
hz1-C
b.m* q
c.hformula 2
Wherein, q
c: burning 1kg coke carbon element institute can offer the effectively comprehensive heat in high-temperature zone by z
Q
k: self heat dissipation of the coke of every kilogram of carbon element
Q
hz1: the known heat exhaustion item in high-temperature zone
Q
c.h: the comprehensive heat of burning 1kg carbon element before air port
High-temperature zone carbon and oxygen balance equation:
O
a2: ore is through floating contained oxygen amount of scholar's body stage
H
2r.m: the high-temperature zone of the pig iron per ton is from the protohydrogen amount of going back of coal dust
By two equations 2 and formula 3 simultaneous, form a linear equation in two unknowns group, contain two unknown numbers: the coke carbon element amount C of burning before air port
b.k, the direct-reduction of iron consumes carbon element amount C
dFe, simultaneous solution can be obtained their numerical value, and substitution formula 1 can be determined theoretical coke ratio.
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| CN112593030B (en) * | 2020-11-26 | 2022-04-12 | 山西太钢不锈钢股份有限公司 | Method for determining furnace heat by utilizing blast furnace slag iron heat index |
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