CN111690784B - Blast furnace fuel compensation and H in blast furnace gas2Method for quantifying content - Google Patents
Blast furnace fuel compensation and H in blast furnace gas2Method for quantifying content Download PDFInfo
- Publication number
- CN111690784B CN111690784B CN202010618249.4A CN202010618249A CN111690784B CN 111690784 B CN111690784 B CN 111690784B CN 202010618249 A CN202010618249 A CN 202010618249A CN 111690784 B CN111690784 B CN 111690784B
- Authority
- CN
- China
- Prior art keywords
- blast furnace
- fuel
- gas
- heat
- blast
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention discloses a blast furnace fuel compensation amount and blast furnace gas H2The method for quantifying the content comprises the following four steps: 1) calculate 1m3H of (A) to (B)2Decomposition heat; 2) calculating the comprehensive heat value of fuelUtilization rate; 3) calculating the amount of the iron gas per ton; 4) a fuel compensation value is calculated based on the thermal balance. The invention quantifies the compensation quantity of the blast furnace fuel and the blast furnace gas H2The data among the contents and the fuel are compensated according to the related data, so that the blast furnace keeps a relatively stable thermal state and smelting stability, the yield of the blast furnace is increased, the fuel consumption is reduced, low carbon and environmental protection are promoted, and the method has remarkable economic and social benefits.
Description
Technical Field
The invention belongs to the technical field of blast furnace smelting, and particularly relates to blast furnace fuel compensation amount and blast furnace gas H2Quantitative method between contents.
Background
Blast furnaces are countercurrent reactors of the shaft furnace type, varying in volume from hundreds to thousands of cubic meters, in which the problems of thermal equilibrium that occur are rather complex. The production process of the blast furnace is continuously carried out, the material is continuously fed from the top of the blast furnace, and the iron notch at the lower part is continuously tapped. The raw materials fed from the furnace top include sintered ore, pellet and lump ore. The blast furnace fuel comprises solid coke fed from the top of the furnace and pulverized coal fed from tuyeres. The furnace charge of the blast furnace is acted by high-temperature reducing gas from the upstream, and the reducing gas is generated by the combustion reaction of air blown by a blower, air heated by a hot blast stove and entering the blast furnace from a tuyere and coke of the blast furnace. The furnace charge is continuously heated, decomposed, reduced, softened, melted, dropped and carburized to finally form slag iron melt for separation.
The main functions of the fuel in the blast furnace smelting process are as follows: (1) the heat source is used as a main heat source for blast furnace smelting; (2) a reducing agent for a blast furnace; (3) a carburizing agent for blast furnace molten iron; (4) coke also acts as a framework for blast furnace permeability. The fuel ratio in the blast furnace is very important in connection with the blast furnace gas composition. H in the top gas component of the blast furnace under the condition that the raw fuel component of the blast furnace is relatively stable2The content may be increased by water leakage in a high-temperature region of the blast furnace (water gas reaction: C + H)2O＝H2+ CO-heat). Despite the increased H of the water gas reaction2Can be subsequently processedTo generate H as a reducing agent2Part of the energy can be used by reduction reaction, but at least more than 50% of H2Cannot be utilized and therefore the blast furnace needs to consume more heat. In addition, H occurs2The reduction reaction involves many reactions, and the reactions that occur change correspondingly with the difference in temperature, and the heat utilization condition is complicated, and the calculation is complicated and inaccurate. While the H in the blast furnace gas2When the content is increased, the blast furnace needs to maintain the heat balance in the blast furnace by compensating fuel. The compensation quantity of the blast furnace fuel and the blast furnace gas H are well quantified2The relation between the contents has important significance for keeping a relatively stable thermal state of the blast furnace and the smelting stability.
Disclosure of Invention
In the iron-making process of the blast furnace, the main reactions are as follows:
1) and (3) combustion reaction:
C+1/2O2＝CO +110KJ (1)
2) water carbon reaction
C+H2O＝H2+CO-176KJ (2)
3) C gasification reaction
C+CO2＝2CO-165.8KJ (3)
4) Further reduction of C source
41) The order of CO reduction and heat consumption at > 570 ℃ is as follows:
3Fe2O3+CO＝2Fe3O4+CO+37.11KJ (4)
3Fe3O4+CO＝3FeO+CO-20.88KJ (5)
FeO+CO＝Fe+CO+13.598KJ (6)
42) the sequence of CO reduction and heat consumption at the temperature of less than or equal to 570 ℃ is as follows:
3Fe2O3+CO＝2Fe3O4+CO2 +37.11KJ (7)
Fe3O4+4CO＝3Fe+4CO2+17.154 (8)
5)H2reduction reaction of (2)
51) Not less than 570 ℃ H2The reduction and heat consumption sequence is as follows:
3Fe2O3+H2＝2Fe3O4+H2O-21.789KJ (9)
Fe3O4+H2＝3FeO+H2O-63.555KJ (10)
FeO+H2＝Fe+H2O-27.698KJ (11)
52) h at the temperature of less than or equal to 570 DEG C2The reduction and heat consumption sequence is as follows:
3Fe2O3+H2＝2Fe3O4+H2O-21.789KJ (12)
Fe3O4+4H2＝3Fe+4H2O-63.555KJ (13)
the chemical reactions occurring in the blast furnace all produce heat variations, which are cumbersome to calculate for each step and difficult to achieve due to lack of much data. Therefore, the technical problem to be solved by the present invention is to provide a blast furnace fuel compensation amount and blast furnace gas H by using limited data2Quantitative method between contents, thereby simply and accurately calculating H2The fuel required to be compensated when the content changes.
To solve the above technical problem, the present invention is based on the following considerations:
the coal gas brought to the furnace bosh by the blast furnace tuyere only contains CO and H2、N2And the top gas mainly contains CO2、CO、H2And H2And O. The chemical reactions are all in a closed state. Further reduction reaction of C source and H source in upper coal gas chemical reaction in blast furnace shaft2The reduction reaction is carried out simultaneously. But CO, H2All only 40-50% of the carbon is converted into CO2And H2And O. Blast furnace roof H2The content increases and the fuel must be replenished to ensure the heat balance in the blast furnace.
Quantifying blast furnace fuel compensation amount and furnace top H2The quantitative relation of the contents mainly has the following characteristics:
1) the heat change data of various complex chemical reactions in the blast furnace are not needed, and limited data, mainly the gas components and the carbon monoxide heat value utilization rate eta are utilizedCOEasily detected data such as fuel calorific value and blast furnace air volume, and accurately calculating H2The corresponding fuel to be replenished is increased to maintain the original heat balance.
2) Splitting the chemical equation of the water gas reaction of the blast furnace, not adopting the heat effect calculation of the water gas reaction of the blast furnace, but adopting H2Calculation of H in blast furnace gas Unit from the Heat of decomposition of O2Increasing the amount of heat consumed.
3) Fuel calorific value utilization ratio adopts H2Treated differently from the C source region, according to H2And calculating the comprehensive heat value utilization rate of the fuel by weighting the ratio of the heat value of the C source.
Therefore, the technical scheme designed by the invention is as follows:
1) passing through N in the blast furnace2Equilibrium determination of H in unit pig iron gas2Increase of (m)3/tp)。
2) By the formula ηC＝293+0.707ηCOCalculating the heat value utilization rate eta of the C source fuelC。
3) Heat value utilization rate eta of COCOObtained from a top gas composition analyzer, H2Utilization ratio etaH2Hypothesis and CO utilization ηCOAre equal.
4) Considering the comprehensive heat value utilization rate and H of the fuel2The content calculates a quantitative value of the heat compensation.
If water leaks from the upper part of the blast furnace, only evaporation is needed, fuel consumption is extremely limited, and heat compensation is not needed. However, the water is in the lower part of the furnace body, and the furnace bosh and the tuyere zone generate water gas reaction, so various complicated chemical reactions occur, and the calculation is not carried out through the heat change of various chemical reactions. By water gas reaction only, i.e. H2Reaction of O and C to generate CO and H2：H2O+C＝CO+H2-Q (endotherm).For ease of calculation, the water gas reaction was split into H2O＝H2+1/2O2And C +1/2O2CO. Its C +1/2O2CO is burned in front of the tuyere depending on the coke. Considering only H2O＝H2+1/2O2242KJ/mol, then:
1)1mol of water decomposition heat: h2O＝H2+1/2O2242KJ/mol, thus increasing the blast furnace gas by 1m3H of (A) to (B)2The heat of decomposition was (1000/22.4) × 242 ═ 10803 KJ.
2) Heat value utilization rate eta of C source fuel in fuelC＝0.293+0.707ηCO，ηCOAnd reading by a blast furnace top gas analyzer. In the present invention, it is considered that H2The heat value utilization rate is equal to the CO heat value utilization rate etaH2＝ηCOThus, the overall calorific value utilization η of the fuelHeald＝(n×ηH2+m×ηC) V (m + n), where m is the heat of the C source fuel in 1Kg of fuel and n is H in 1Kg of fuel2The heat quantity of (1) m and n is KJ/Kg.
3) The ton iron air consumption is obtained according to the blast furnace air quantity and the pig iron yield under the normal condition of the blast furnace. The blast furnace air quantity is Fm3And the output per minute is P tons, and the air consumption per ton of iron is F/P.
4) The blast furnace ton iron gas amount is determined by ton iron wind consumption, blast air neutralization and N in top gas2And (6) calculating. Make N in blast furnace blast2The volume content is K, N is brought into the top gas by blast2The volume content of the gas occupying the furnace top is R, the furnace top is according to N2The balance calculation of the amount of iron gas in the top ton of the furnace is as follows: (F/P) x (K/R), wherein K is 100% -21% -A, and A is the oxygen enrichment rate of blast air; r is obtained from a top gas component analyzer.
5) Calculating fuel compensation values based on thermal balance
51) According to H in blast furnace ton iron gas2Content change Δ H2% calculated heat to compensate: qSupplement device＝(F/P)×(K/R)×10803×ΔH2%, wherein QSupplement deviceHas the unit of KJ
52) According to the comprehensive heat value utilization rate eta of the fuelHealdAnd QSupplement deviceCalculating the fuel compensation mSupplement device：
mSupplement device＝QSupplement device/ηHeald
＝(F/P)*(K/R)*10803*ΔH2％/(n*ηH2+m*ηC) M and n are KJ/Kg, mSupplement deviceThe unit is Kg.
The reactions occurring in the blast furnace are complex and the heat is difficult to calculate accurately. If the compensation quantity of the blast furnace fuel and the blast furnace gas H are not accurately calculated, the compensation quantity of the blast furnace fuel and the blast furnace gas H are quantized2The data between the contents, which tend to compensate the fuel too much, on the one hand destroy the thermal stability of the blast furnace and on the other hand increase the fuel consumption. If the compensation fuel is insufficient, the temperature of the blast furnace is too low, the smooth operation of the blast furnace is damaged, the quality of blast furnace products is unqualified, and even the blast furnace is abnormal. The method can avoid a lot of data needing to be calculated, and accurately quantize the blast furnace fuel compensation amount and the blast furnace gas H2The relationship between the contents ensures that the blast furnace keeps a relatively stable thermal state and smelting stability, increases the yield of the blast furnace, reduces the fuel consumption, promotes low carbon and environmental protection, and has remarkable economic and social benefits.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
(1) Calculate 1m3H of (A) to (B)2Heat of decomposition
By means of H2Calculation of H in blast furnace gas Unit from the Heat of decomposition of O2Increasing the amount of heat consumed.
The water gas reaction namely reacts with C to generate CO and H2：H2O+C＝CO+H2-Q (endotherm). For ease of calculation, the water gas reaction was split into
H2O＝H2+1/2O2And C +1/2O2＝CO。
Its C +1/2O2CO is burned in front of the tuyere depending on the coke. Considering only H2O＝H2+1/2O2242KJ/mol, then:
1mol of water decomposition heat: h2O＝H2+1/2O2242KJ/mol, thus increasing the blast furnace gasPlus 1m3H of (A) to (B)2The heat consumed was (1000/22.4) × 242 ═ 10803 KJ.
(2) Calculating the comprehensive heat value utilization rate of fuel
Fuel calorific value utilization ratio adopts H2Is distinguished from C by H2And calculating the comprehensive heat value utilization rate of the fuel by weighting the proportion of the heat value C and the heat value C. The heat quantity of C in 1Kg of fuel is m, H2The heat is n. CO and H in blast furnace gas2The utilization rate is obtained by a furnace top gas component analyzerH2＝ηCO. According to ηC＝293+0.707ηCOAnd calculating to obtain the comprehensive heat value utilization rate of the fuel as follows: [ n × η [ ] ]H2+m×(0.293+0.707ηCO)]/(m+n)。
(3) Calculating the amount of iron gas per ton
The ton iron wind consumption is obtained according to the blast furnace wind measuring scale and the pig iron yield. Passing through N in the blast furnace2The amount of increase per pig iron gas is determined by equilibrium, so that it is possible to determine the H2Content Change calculation H2Increase (m)3Tp) and the corresponding need to increase the amount of heat consumed. The blast furnace air quantity is Fm3The iron yield per minute per min is P tons, and the iron wind quantity per ton is F/P.
Blast furnace blast N2The volume content is K, N is brought into the top gas by blast2The volume content of the gas occupying the furnace top is R, the furnace top is according to N2The balance calculation of the amount of iron gas in the top ton of the furnace is as follows: (F/P) x (K/R), wherein K is 100% -21% -A, and A is the oxygen enrichment rate of blast air; r is obtained from a top gas component analyzer.
(4) Calculating fuel compensation values based on thermal balance
1) According to H in blast furnace ton iron gas2Content change Δ H2% calculated heat to compensate: qSupplement device＝(F/P)×(K/R)×10803×ΔH2%, wherein QSupplement deviceHas the unit of KJ
2) According to the comprehensive heat value utilization rate and Q of the fuelSupplement deviceCalculating the fuel compensation mSupplement device：
mSupplement device＝QSupplement device/ηC
＝(F/P)*(K/R)*10803*ΔH2％/[n*ηH2+m*(0.293+0.707ηCO)]M and n are KJ/Kg, mSupplement deviceIn Kg/ton (i.e. the amount to be compensated per ton of iron produced).
Example 1
A certain length of 3200m3The blast furnace always leaks water after 16 years of production, and H is normally generated under the condition of blast furnace gas2The content is generally 3.2%, H after water leakage2The content is increased from 3.2% to 4.2% of normal content, delta H2Percent is 1%. The heat quantity of C in 1Kg of fuel is 27312KJ, H2The heat was 3388 KJ. CO and H in blast furnace gas2The utilization rate is obtained by a furnace top gas component analyzerH2＝ηCO48%. The blast furnace air quantity is 5700m3The production rate per minute was 5.70 tons/min. The oxygen enrichment rate A of the blast furnace is 5 percent, and blast furnace blast N2The volume content of K is 100% -21% -5% -74%, and N is brought into top gas by blast air2Accounting for 50 percent of the volume content of the top gas. Ton iron reason H of blast furnace2The fuel whose content increase has to be compensated is quantified as follows.
(1) Calculate 1m3H of (A) to (B)2Heat of decomposition
By means of H2Calculation of H in blast furnace gas Unit from the Heat of decomposition of O2Increasing the amount of heat consumed.
The water gas reaction namely reacts with C to generate CO and H2：H2O+C＝CO+H2-Q (endotherm). For ease of calculation, the water gas reaction was split into
H2O＝H2+1/2O2And C +1/2O2＝CO
Its C +1/2O2CO is burned in front of the tuyere depending on the coke. Considering only H2O＝H2+1/2O2242KJ/mol, then:
1mol of water decomposition heat: h2O＝H2+1/2O2242KJ/mol, thus increasing the blast furnace gas by 1m3H of (A) to (B)2The heat consumed was (1000/22.4) × 242 ═ 10803 KJ.
(2) Calculating weighted value of fuel calorific value utilization rate
Fuel calorific value utilization ratio adopts H2Is distinguished from C by H2And calculating the total heat value utilization rate of the fuel by weighting the ratio of the heat value C and the heat value C. The heat quantity of C in 1Kg of fuel is 27312KJ, H2The heat was 3388 KJ. CO and H in blast furnace gas2The utilization rate is obtained by a furnace top gas component analyzerH2＝ηCO48%. The comprehensive heat value utilization rate of the fuel is as follows: [ 3388X 48% + 27312X (0.293+ 0.707X 48%)]/(27312+3388)。
(3) Calculating the amount of iron gas per ton
The ton iron wind consumption is obtained according to the blast furnace wind measuring scale and the pig iron yield. Passing through N in the blast furnace2The increase of unit pig iron gas is determined by balance, and then H is calculated2Increase (m)3Tp). The blast furnace air quantity is Fm3The output per minute is P tons, and the iron wind quantity per ton is F/P, 5700/5.7 and 1000 (m)3/tp)。
Blast furnace blast N2The volume content is K, N is brought into the top gas by blast2The volume content of the gas occupying the furnace top is R, the furnace top is according to N2The balance calculation of the amount of iron gas in the top ton of the furnace is as follows: (F/P) × (K/R), wherein K ═ 100% to 21% a; r is obtained from a top gas component analyzer. The iron gas content per ton was 1000 × (74%/50%).
(4) Calculating a fuel compensation value from the thermal balance:
1) h in blast furnace ton iron gas2Content change Δ H2% heat to be compensated (F/P). times. (K/R). times.10803 KJ.times.DELTA.H2％。
2) Calculating fuel compensation from heat balance
The heat quantity of C in 1Kg of fuel is m, H2The heat is n, and the H in blast furnace ton iron gas is set2Content change Δ H2% fuel to be compensated xKg
X*[n*ηH2+m*(0.293+0.707ηCO)]/(m+n)*(m+n)＝(F/P)*(K/R)*10803KJ* ΔH2％。
Therefore, H in blast furnace ton iron gas2Content change Δ H2% fuel to be compensated is X ═ F/P ═ K/R ═ 10803 KJ:. DELTA.H2％/[n*ηH2+m*(0.293+0.707ηCO)]
(m and n are KJ/Kg);
carry over the above numbers
X＝1000*(74％/50％) *10803*1％/[3388*48％+27312*(0.293+0.707*48％)]
＝8.46Kg；
Therefore, the blast furnace produces the H under the normal condition of the blast furnace gas2The content is 3.2 percent, and H is generated after water leakage2The content is increased from 3.2% to 4.2% of normal content, delta H2Percent to 1 percent, 8.46Kg/t.p fuel should be added. The blast furnace is adjusted to increase the fuel ratio by 8.46Kg/t.p, and the blast furnace maintains the thermal stability.
Example 2
Some 4100m3Water leakage of the blast furnace often occurs 11 years after the blast furnace is produced, and H is generated under the normal condition of blast furnace gas2The content is generally 3.0 percent, and H is generated after water leakage2The content is increased from 3.0% to 3.8% of normal content, delta H2Percent is 0.8%. The heat quantity of C in 1Kg of fuel is 27000KJ, H2The heat quantity is 3600 KJ. CO and H in blast furnace gas2The utilization rate is obtained by a furnace top gas component analyzer, eta H2η CO is 50%. The blast furnace air volume is 7100m3The production rate per minute was 7.30 tons/min. The oxygen enrichment rate A of the blast furnace is 6 percent, and blast furnace blast N2The volume content of K is 100% -21% -6% -73%, and N is brought into top gas by blast air2Accounting for 50.5 percent of the volume content of the top gas. Ton iron reason H of blast furnace2The fuel whose content increase has to be compensated is quantified as follows.
(1) Calculate thus 1m3H of (A) to (B)2Heat of decomposition
By means of H2Calculation of H in blast furnace gas Unit from the Heat of decomposition of O2Increasing the amount of heat consumed.
The water gas reaction namely reacts with C to generate CO and H2：H2O+C＝CO+H2-Q (endotherm). For ease of calculation, the water gas reaction was split into
H2O＝H2+1/2O2And C +1/2O2＝CO
Its C +1/2O2CO is burned in front of the tuyere depending on the coke. Considering only H2O＝H2+1/2O2242KJ/mol, then:
1mol of water decomposition heat: h2O＝H2+1/2O2242KJ/mol. 1m therefore3H of (A) to (B)2The heat of decomposition was (1000/22.4) × 242 ═ 10803 KJ.
(2) Calculating weighted value of fuel calorific value utilization rate
Fuel calorific value utilization ratio adopts H2Is distinguished from C by H2And calculating the total heat value utilization rate of the fuel by weighting the ratio of the heat value C and the heat value C. The heat quantity of C in 1Kg of fuel is 27000KJ, H2The heat quantity is 3600 KJ. CO and H in blast furnace gas2The utilization rate is obtained by a furnace top gas component analyzerH2＝ηCO50%. The comprehensive heat value utilization rate of the fuel is as follows: [ 3600X 50% + 27000X (0.293+ 0.707X 50%)]/(27000+3600)
(3) Calculating the amount of iron gas per ton
The ton iron wind consumption is obtained according to the blast furnace wind measuring scale and the pig iron yield. Passing through N in the blast furnace2Balance determining unit pig iron gas H2Increase (m)3Tp). The blast furnace air quantity is Fm3The output per minute is P tons, and the iron wind quantity per ton is F/P, 7100/7.3 or 973(m3/tp)
Blast furnace blast N2The volume content is K, N is brought into the top gas by blast2The volume content of the gas occupying the furnace top is R, the furnace top is according to N2The balance calculation of the amount of iron gas in the top ton of the furnace is as follows: (F/P) x (K/R), wherein K is derived from 100% -21% -A; r is obtained from a top gas component analyzer. The iron gas quantity per ton is 973 (73%/50.5%)
(4) Calculating fuel compensation values based on thermal balance
Blast furnace ton iron gas H2Content change Δ H2% heat to be compensated
(F/P)×(K/R)×10803KJ×ΔH2％
② calculating fuel compensation amount according to heat balance
The heat quantity of C in 1Kg of fuel is m, H2The heat is n, and the H in blast furnace ton iron gas is set2Content change Δ H2% fuel to be compensated xKg
X*[n*ηH2+m*(0.293+0.707ηCO)]/(m+n)*(m+n)＝(F/P)*(K/R)*10803KJ* ΔH2％
Therefore, H in blast furnace ton iron gas2Content change Δ H2% fuel to be compensated is X ═ F/P ═ K/R ═ 10803 KJ:. DELTA.H2％/[n*ηH2+m*(0.293+0.707ηCO)]
(m, n are KJ/Kg)
Carry over the above numbers
X＝973*(73％/50.5％) *10803*0.8％/[3600*50％+27000*(0.293+0.707*50％)]
＝6.49Kg
Therefore, the blast furnace produces the H under the normal condition of the blast furnace gas2The content is 3.0 percent, and H is generated after water leakage2The content is increased from 3.0% to 3.8% of normal content, delta H2Percent to 0.8 percent, 6.49Kg/t.p of fuel should be added. The blast furnace is adjusted to increase the fuel ratio by 6.49Kg/t.p, and the blast furnace maintains the thermal stability.
Embodiment 3
A certain 2600m3The blast furnace always leaks water after 16 years of production, and H is normally generated under the condition of blast furnace gas2The content is generally 3.5%, H after water leakage2The content is increased from 3.5% to 4.2% of the normal content, delta H2Percent is 0.7%. The heat quantity of C in 1Kg of fuel is 27102KJ, H2The heat quantity was 3500 KJ. CO and H in blast furnace gas2The utilization rate is obtained by a furnace top gas component analyzerH2＝ηCO46%. The blast furnace air volume is 5200m3The production rate per minute was 5.18 tons/min. The oxygen enrichment rate of the blast furnace is 5 percent, and blast N of the blast furnace2The volume content of K is 100% -21% -5% -74%, and N is brought into top gas by blast air2Accounting for 51 percent of the volume content of the top gas. Ton iron reason H of blast furnace2The fuel whose content increase has to be compensated is quantified as follows.
(1) Calculate thus 1m3H of (A) to (B)2Heat of decomposition
By means of H2Calculation of H in blast furnace gas Unit from the Heat of decomposition of O2Increasing the amount of heat consumed.
The water gas reaction namely reacts with C to generate CO and H2：H2O+C＝CO+H2-Q (suction)Heat). For ease of calculation, the water gas reaction was split into
H2O＝H2+1/2O2And C +1/2O2＝CO
Its C +1/2O2CO is burned in front of the tuyere depending on the coke. Considering only H2O＝H2+1/2O2242KJ/mol, then:
1mol of water decomposition heat: h2O＝H2+1/2O2242KJ/mol. 1m therefore3H of (A) to (B)2Decomposition heat of (1000/22.4) × 242 ═ 10803 KJ;
(2) calculating weighted value of fuel calorific value utilization rate
Fuel calorific value utilization ratio adopts H2Is distinguished from C by H2And calculating the total heat value utilization rate of the fuel by weighting the ratio of the heat value C and the heat value C. The heat quantity of C in 1Kg of fuel is 27312KJ, H2The heat was 3388 KJ. CO and H in blast furnace gas2The utilization rate is obtained by a furnace top gas component analyzerH2＝ηCO48%. The comprehensive heat value utilization rate of the fuel is as follows: [ 3500X 46% + 27102X (0.293+ 0.707X 46%)]/(27102+3500)；
(3) Calculating the amount of iron gas per ton
The ton iron wind consumption is obtained according to the blast furnace wind measuring scale and the pig iron yield. Passing through N in the blast furnace2Balance determining unit pig iron gas H2Increase (m)3Tp). The blast furnace air quantity is Fm3The output per minute per min is P tons, the iron wind quantity per ton is F/P5200/5.18 1004(m is3/tp)
Blast furnace blast N2The volume content is K, N is brought into the top gas by blast2The volume content of the gas occupying the furnace top is R, the furnace top is according to N2The balance calculation of the amount of iron gas in the top ton of the furnace is as follows: (F/P) x (K/R), wherein K is derived from 100% -21% -A; r is obtained from a top gas component analyzer. The iron gas quantity per ton is 1004 (74%/51%)
(4) Calculating fuel compensation values based on thermal balance
Blast furnace ton iron gas H2Content change Δ H2% heat to be compensated
(F/P)×(K/R)×10803KJ×ΔH2％；
② calculating fuel compensation amount according to heat balance
The heat quantity of C in 1Kg of fuel is m, H2The heat is n, and the H in blast furnace ton iron gas is set2Content change Δ H2The% fuel to be compensated is XKg:
X*[n*ηH2+m*(0.293+0.707ηCO)]/(m+n)*(m+n)＝(F/P)*(K/R)*10803KJ* ΔH2％；
therefore, H in blast furnace ton iron gas2Content change Δ H2% fuel to compensate is: x ═ F/P ═ K/R ═ 10803KJ ^ Δ H2％/[n*ηH2+m*(0.293+0.707ηCO)]
(m and n are KJ/Kg);
carry over the above numbers
X＝1004*(74％/51％) *10803*0.7％/[3500*46％+27102*(0.293+0.707*46％)]
＝6.86Kg；
Therefore, the blast furnace produces the H under the normal condition of the blast furnace gas2The content is 3.5 percent, and H is generated after water leakage2The content is increased from 3.5% to 4.2% of the normal content, delta H2Percent to 0.7 percent should be added 6.86Kg/t.p of fuel. The blast furnace is adjusted to increase the fuel ratio by 6.86Kg/t.p, and the blast furnace maintains the thermal stability.
Claims (1)
1. Blast furnace fuel compensation amount and blast furnace gas H2The method for quantifying the content is characterized in that: the method comprises the following steps:
1) calculate 1m3H of (A) to (B)2Decomposition heat:
according to the fact that the water decomposition heat of 1mol is 242KJ/mol, the increase of 1m of blast furnace gas is calculated3H of (A) to (B)2The heat consumed was (1000/22.4) × 242 ═ 10803 KJ;
2) calculating the comprehensive heat value utilization rate of the fuel:
according to H2Calculating the comprehensive heat value utilization rate of the fuel by weighting the proportion of the heat value C and the heat value C; let the C heat in 1Kg of fuel be m, H2The heat is n; analysis of the utilization rate of CO in blast furnace gas by the components of the top gasGet out and let etaH2＝ηCO，ηC＝0.293+0.707ηCOAnd calculating to obtain the comprehensive heat value utilization rate of the fuel as follows: etaHeald＝[n×ηH2+m×(0.293+0.707ηCO)](m + n), wherein the unit of m and n is KJ/Kg;
3) and (3) calculating the amount of iron gas per ton:
the blast air quantity of the blast furnace is Fm3Min, wherein the iron yield per minute is P tons, and the iron wind quantity per ton is F/P;
blast furnace blast N2The volume content is K, N is brought into the top gas by blast2The volume content of the top gas is R, according to N2The balance calculation of the amount of iron gas in the top ton of the furnace is as follows: (F/P) x (K/R), wherein K is 100% -21% -A, and A is the oxygen enrichment rate of blast air; r is obtained from a furnace top gas component analyzer;
4) calculating a fuel compensation value from the thermal balance:
41) according to H in blast furnace ton iron gas2Content change Δ H2% calculated heat to be compensated per minute: qSupplement device＝(F/P)×(K/R)×ΔH2%. times.10803, wherein QSupplement deviceThe unit of (b) is KJ;
42) according to the comprehensive heat value utilization rate eta of the fuelHealdAnd QSupplement deviceCalculating the fuel compensation mSupplement device：
(m+n)mSupplement device＝QSupplement device/ηHeald
mSupplement device＝(F/P)×(K/R)×ΔH2％×10803/[n*ηH2+m*(0.293+0.707ηCO)]，
mSupplement deviceThe unit is Kg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010618249.4A CN111690784B (en) | 2020-06-30 | 2020-06-30 | Blast furnace fuel compensation and H in blast furnace gas2Method for quantifying content |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010618249.4A CN111690784B (en) | 2020-06-30 | 2020-06-30 | Blast furnace fuel compensation and H in blast furnace gas2Method for quantifying content |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111690784A CN111690784A (en) | 2020-09-22 |
| CN111690784B true CN111690784B (en) | 2021-11-12 |
Family
ID=72484696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010618249.4A Active CN111690784B (en) | 2020-06-30 | 2020-06-30 | Blast furnace fuel compensation and H in blast furnace gas2Method for quantifying content |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111690784B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112836855B (en) * | 2021-01-05 | 2023-05-05 | 重庆科技学院 | Blast furnace gas utilization rate fluctuation condition prediction method, system and computer equipment |
| CN112989570B (en) * | 2021-02-08 | 2023-03-17 | 山西太钢不锈钢股份有限公司 | Method for calculating top coal gas volume based on blast furnace conditions |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| HRP970303B1 (en) * | 1996-06-05 | 2002-06-30 | Holderbank Financ Glarus | Method for making pozzolans, synthetic blast-furnance slag, belite or alite clinkers, and pig-iron alloys, from oxidic slag and a device for implementing this method |
| CN101074453A (en) * | 2006-09-13 | 2007-11-21 | 童裳慧 | Efficient economical dust collecting method and dust collector for iron-smelting blast furnace |
| CN103952503B (en) * | 2014-05-15 | 2015-11-04 | 北京科技大学 | A kind of establishment method of pulverized coal injection into blast furna cost performance evaluation model |
| CN106011341B (en) * | 2016-08-08 | 2018-10-30 | 四川德胜集团钒钛有限公司 | The method that blast furnace process schreyerite carries high-coal ratio |
| CN110484665A (en) * | 2019-06-04 | 2019-11-22 | 酒泉钢铁(集团)有限责任公司 | A kind of compensation method for thermal in gas injection smelting process |
| 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 |
-
2020
- 2020-06-30 CN CN202010618249.4A patent/CN111690784B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111690784A (en) | 2020-09-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Nishioka et al. | Sustainable aspects of CO 2 ultimate reduction in the steelmaking process (COURSE50 Project), part 1: Hydrogen reduction in the blast furnace | |
| CN101775451B (en) | Blast-furnace smelting method for vanadium titano-magnetite | |
| CN111690784B (en) | Blast furnace fuel compensation and H in blast furnace gas2Method for quantifying content | |
| Ghanbari et al. | Process integration of steelmaking and methanol production for suppressing CO2 emissions—A study of different auxiliary fuels | |
| CN103911479B (en) | The method of chrome ore direct Reducing and Alloying in 90t top and bottom combined blown converter | |
| Zhang et al. | Unsteady analyses of the top gas recycling oxygen blast furnace | |
| Ziebik et al. | Energy analysis of a blast-furnace system operating with the Corex process and CO2 removal | |
| US20150275321A1 (en) | Method for operating blast furnace and method for producing molten pig iron | |
| Barrett et al. | Assessment of blast furnace operational constraints in the presence of hydrogen injection | |
| Prachethan Kumar et al. | Modelling of Corex process for optimisation of operational parameters | |
| Jiang et al. | Properties and structural optimization of pulverized coal for blast furnace injection | |
| Kumar et al. | Comparative exergy analysis between rotary hearth furnace-electric arc furnace and blast furnace-basic oxygen furnace steelmaking routes | |
| Sun et al. | Influence of operation parameters on dome temperature of COREX melter gasifier | |
| Kumar et al. | Operating experiences with Corex and blast furnace at JSW Steel Ltd | |
| CN101613616A (en) | Coke for furnace protection and preparation method thereof | |
| CN113667781B (en) | Method for reducing fuel ratio of blast furnace | |
| Yao et al. | A mathematical model of COREX process with top gas recycling | |
| Lötter et al. | Pig Iron Production (Post Blast Furnace Era) | |
| Kou et al. | Static model study on the characteristics of coke oven gas dome injection in COREX melter gasifier | |
| Lu et al. | Alternative ironmaking processes and their ferrous burden quality requirements | |
| AU2008355447A1 (en) | A method of iron smelting in blast furnace with high temperature coal gas | |
| Wingrove et al. | Developments in iron making and opportunities for power generation | |
| JP7315125B1 (en) | Method for reducing fine iron ore | |
| CN115747394A (en) | Coal injection comprehensive regulation and control method based on coal-coke replacement ratio and blast furnace operation | |
| JP5831219B2 (en) | Heating method of molten iron |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |