CN117286295A - Hot blast stove gas consumption prediction method based on hot blast stove cooling and heating judgment - Google Patents
Hot blast stove gas consumption prediction method based on hot blast stove cooling and heating judgment Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 94
- 238000010438 heat treatment Methods 0.000 title claims abstract description 21
- 238000001816 cooling Methods 0.000 title claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 57
- 238000002485 combustion reaction Methods 0.000 claims abstract description 52
- 239000000446 fuel Substances 0.000 claims abstract description 41
- 235000019504 cigarettes Nutrition 0.000 claims abstract description 16
- 239000000779 smoke Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 53
- 230000008859 change Effects 0.000 claims description 30
- 239000000126 substance Substances 0.000 claims description 28
- 238000004364 calculation method Methods 0.000 claims description 22
- 239000011449 brick Substances 0.000 claims description 20
- 230000017525 heat dissipation Effects 0.000 claims description 10
- 229920006395 saturated elastomer Polymers 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 6
- 239000010959 steel Substances 0.000 abstract description 6
- 238000004134 energy conservation Methods 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000005265 energy consumption Methods 0.000 description 7
- 238000005338 heat storage Methods 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- 239000000567 combustion gas Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 238000009841 combustion method Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/02—Brick hot-blast stoves
- C21B9/04—Brick hot-blast stoves with combustion shaft
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2300/00—Process aspects
- C21B2300/04—Modeling of the process, e.g. for control purposes; CII
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Abstract
The invention provides a hot blast stove gas consumption prediction method based on hot blast stove cooling and heating stove judgment, which belongs to the technical field of energy conservation in the steel industry, and aims to solve the technical problem of how to improve the hot blast temperature and reduce the consumption of a hot blast stove, and the technical scheme adopted by the invention comprises the following steps: based on the parameter dome temperature T Arch Temperature T of hot air Wind power Temperature T of exhaust gas Cigarette with smoke Judging the furnace condition state of the hot blast stove after the furnace is replaced; according to the determined furnace condition state, measuring and calculating the residual heat after heat exchange of the hot blast stove; and predicting the gas amount of the combustion furnace based on the state of the furnace condition according to the calculated residual heat of the hot blast furnace. The method fully considers the energy conversion of the hot blast stove in the heat exchange process, predicts the gas heat load required by each combustion according to the cold and hot stove states, ensures the stable temperature of the hot blast stove, reduces the fuel consumption, provides accurate data support for the prediction of the single gas consumption of the hot blast stove, and realizes the heatAnd (5) accurately controlling the air furnace.
Description
Technical Field
The invention relates to the technical field of energy conservation in the steel industry, in particular to a hot blast stove gas consumption prediction method based on hot blast stove cooling and hot stove judgment.
Background
The iron making process is the largest energy consumption of a large household in the iron and steel industry, the energy consumption accounts for more than 60% of the whole comprehensive energy consumption, and the reduction of the energy consumption of the iron making process is an important means for solving the energy consumption problem in the iron and steel industry. The main energy-saving equipment in iron-making process is blast furnace and hot-blast furnace, in which the blast furnace utilizes reduction reaction to convert iron oxide into iron-carbon alloy, and can provide raw material for next steelmaking and steel rolling. The hot blast furnace provides hot blast with proper temperature for the blast furnace, experience shows that when the temperature of the hot blast is increased by 100 ℃, the coke ratio of the blast furnace is reduced by 3% -7%, meanwhile, the hot blast furnace is also a main gas fuel consumption user in the blast furnace process, the energy consumption of the hot blast furnace accounts for more than 14% of the blast furnace process, and the problem of iron making process is to be solved urgently when the temperature of the hot blast is increased.
Along with the continuous deep intellectualization of the blast furnace, the intelligent control model of the hot blast furnace is gradually applied to field reality, the load control is reasonably optimized by predicting the consumption of single-furnace gas through an intelligent control means through prediction and management of the combustion fuel quantity, and further, the consumption of the hot blast furnace is reduced, so that the intelligent control model is an important point for model development.
The invention patent (CN 202110159816.9) discloses a heat balance control technology for a large-scale blast furnace hot blast stove, wherein gas for the blast furnace hot blast stove is formed by mixing pipe network blast furnace gas and converter gas, and the amount of gas required by the stove can be calculated according to target air temperature by realizing real-time heat balance calculation based on the second level of the PLC layer, so that the combustion of the hot blast stove is controlled, and the heat balance of combustion and air supply is realized. The technology can well control the amount of gas required by the combustion of the hot blast stove, not only can stably send out the required high air temperature, but also can reduce the excessive heat accumulation of the hot blast stove, reduce the heat loss, reduce the energy consumption and realize energy conservation and cost reduction.
The invention patent (CN 201010206032.9) provides an intelligent control method for automatic optimizing combustion of a hot blast stove, which is based on total heat supply quantity calculation, and an air-fuel ratio fuzzy controller optimizes an optimal air-fuel ratio coefficient in real time in a combustion period by setting a combustion vault temperature and an exhaust gas temperature target value, and adjusts combustion-supporting air flow and mixed gas flow in real time; the control of the combustion air flow is completed by an exhaust gas temperature regulator, a heat supply regulator and a combustion air regulator; the control of the flow of the mixed gas is completed by a vault temperature regulator and a mixed gas regulator; the air-fuel ratio control is performed by an air-fuel ratio fuzzy controller. The technology can improve the combustion control level of the hot blast stove, has high combustion efficiency, full energy utilization and strong heat storage capacity.
The invention patent (CN 201210312159.8) provides an intelligent optimization control system for a blast furnace hot blast stove, which is used for realizing on-line calculation of heat storage rate based on heat balance, setting a reasonable heat storage rate setting curve according to the total heat of air supply, the burning time and the heat storage rate characteristics of the hot blast stove required by the blast furnace, controlling the fuel quantity at the burning stage in real time according to the heat storage rate, and limiting the calculated fuel quantity according to the vault temperature and the allowable upper limit of the waste gas temperature process; in addition, the heat storage rate is used as an optimization target value, and the air-fuel ratio is optimized by adopting a self-optimizing algorithm of a forward-backward method, so that the fuel utilization rate is maximum, and the energy conservation of the device is ensured from a plurality of layers.
All three prior arts relate to the calculation of the total heat of the hot blast stove heat supply, but the energy loss and the conversion of the heat accumulator energy of the hot blast stove in the heat exchange process cannot be comprehensively considered, and only the heat required by the hot blast is taken as a target, so that larger deviation is caused to the calculation of the total heat of the hot blast stove gas. Meanwhile, the heat conversion of the hot blast stove in the stove burning and stove changing process cannot be considered, the given technology can cause heat unbalance, and energy loss can be caused only by balancing energy change brought by burning and air supply time digestion of a cold and hot stove.
Disclosure of Invention
According to the technical problem of how to raise the temperature of hot air and reduce the consumption of the hot air furnace, the hot air furnace gas consumption prediction method based on hot air furnace cooling and hot air furnace judgment is provided. The invention fully considers the energy conversion of the hot blast stove in the heat exchange process, provides accurate data support for the prediction of single gas consumption of the hot blast stove, and realizes the accurate control of the hot blast stove.
The invention adopts the following technical means:
a hot blast stove gas consumption prediction method based on hot blast stove cooling and heating judgment comprises the following steps:
based on the parameter dome temperature T Arch Temperature T of hot air Wind power Temperature T of exhaust gas Cigarette with smoke Judging the furnace condition state of the hot blast stove after the furnace is replaced;
according to the determined furnace condition state, measuring and calculating the residual heat after heat exchange of the hot blast stove;
and predicting the gas amount of the combustion furnace based on the state of the furnace condition according to the calculated residual heat of the hot blast furnace.
Further, the temperature T of the vault based on the parameter Arch Temperature T of hot air Wind power Temperature T of exhaust gas Cigarette with smoke The method for judging the furnace condition state of the hot blast stove after the stove replacement specifically comprises the following steps:
in the air supply stage of the hot blast furnace, cold air reaches hot air required by the blast furnace through heating of the checker bricks, the vault and the combustion chamber; in the blowing stage, dome temperature T Arch As the air supply progress gradually decreases, the temperature T of the vault Arch Is equal to the set air supply hot air temperature T Wind power plant When in gridThe residual heat of the brick is the same as the residual heat before combustion heating and is in a saturated state; in the saturated state, the dome temperature T is due to the further air supply required by the process Arch Further reducing the temperature T of the hot air of the air supply below the set temperature T Wind power plant T, i.e Arch <T Wind power plant Judging the state of the furnace after furnace change as a cold furnace;
when the air supply time and the air supply quantity are lower than the vault temperature T Arch T, i.e Arch ≥T Wind power plant And judging that the state of the furnace after furnace changing is a hot furnace when the residual heat of the checker bricks is in a supersaturated state.
Further, according to the determined furnace condition state, measuring and calculating the residual heat after heat exchange of the hot blast stove specifically comprises:
according to the heat balance theory, the residual heat after heat exchange of the hot blast stove is calculated, and the calculation formula is as follows:
Q residual (n) ＝Q Receiving (n) -Q Branch (n)
Wherein Q is Residual (n) The residual heat of the hot blast stove after the nth air supply and stove change is expressed as Mj/stove; q (Q) Receiving (n) The total heat quantity of the furnace burning process of the nth hot blast furnace is expressed as Mj/furnace; q (Q) Branch (n) Indicating the total heat expenditure of the nth air supply process, wherein the unit is Mj/furnace;
calculating total income heat Q of nth hot blast stove in burning process Receiving (n) The calculation formula is as follows:
Q receiving (n) ＝Q Chemical (n) +Q Object (n) +Q Remainder (n-1) -Q Cigarette (n) -Q Loss (n)
Wherein Q is Chemical (n) Indicating that the fuel is brought into chemical heat in the nth burning process; q (Q) Object (n) Representing the physical quantity of fuel and combustion air brought in the nth burning process; q (Q) Remainder (n-1) The residual heat after the n-1 th air supply and furnace change is expressed as Mj/furnace; q (Q) Cigarette (n) The heat brought by the flue gas in the nth burning process is shown; q (Q) Loss (n) Other heat loss in the nth burning process is represented;
calculating total heat expenditure Q in nth air supply process Branch (n) The calculation formula is as follows:
Q branch (n) ＝Q Wind (n) +Q’ Loss (n)
Wherein Q is Wind (n) Indicating that the nth air supply hot air brings out physical heat; q'. Loss (n) Indicating other heat losses during the nth air supply.
Further, when the nth air supply is changed, the residual heat Q of the hot blast stove Residual (n) If the result is positive, the furnace condition after furnace change is a hot furnace, and when the nth air supply is changed, the residual heat Q of the hot blast stove Residual (n) If the result is negative, the furnace condition after furnace change is a cold furnace.
Further, the fuel is brought into chemical heat Q in the nth burning process Chemical (n) The unit is Mj/furnace calculated according to the fuel combustion theory; the fuel and the combustion air are brought into the physical quantity Q in the nth burning process Object (n) Calculating according to an energy equation, wherein the unit is Mj/furnace; the flue gas in the nth burning process brings heat Q Cigarette (n) The unit is Mj/furnace according to the energy equation and the fuel combustion theory; other heat loss Q in the nth burning process Loss (n) The method comprises the steps of furnace body heat dissipation, incomplete fuel combustion loss and fuel leakage, and can be used for carrying out heat balance test calibration, and also can be used for taking (5% -20%) multiplied by Q according to the state of the hot blast stove Chemical (n) The unit is Mj/furnace; the nth air supply hot air brings out physical heat Q Wind (n) Calculating according to an energy equation, wherein the unit is Mj/furnace; other heat loss Q 'in the nth air supply process' Loss (n) Comprises furnace body heat dissipation and pipeline heat dissipation, can be used for heat balance test calibration, and can also be used for taking (3% -10%) multiplied by Q according to the state of the hot blast stove Wind (n) The unit is Mj/furnace.
Further, the predicting the gas amount of the combustion furnace based on the state of the furnace condition according to the measured residual heat of the hot blast furnace specifically comprises:
predicting heat quantity Q required by n+1th furnace change Chemical (n+1) The calculation formula is as follows:
Q chemical (n+1) ＝Q Wind (n+1) +Q Residual (n) +∑Q Loss (n+1)
Wherein Q is Wind (n+1) The predicted value of the heat output of the hot air of the (n+1) th furnace change is shown; sigma Q Loss (n+1) Indicating that the n+1th hot blast stove has been producedA total loss prediction value for the process;
predicting the heat load V required by the n+1th furnace change m(n+1) The calculation formula is as follows:
V m(n+1) ＝KQ chemical (n+1) /Q d
Wherein Q is d Indicating a low heating value of the gas used in Kj/Nm 3 The method comprises the steps of carrying out a first treatment on the surface of the K represents the comprehensive utilization coefficient.
Further, the (n+1) -th furnace exchange hot air brings out a heat prediction value Q Wind (n+1) Predicting according to a time sequence mode or according to the burning state of the same hot blast stove, wherein the unit is Mj/stove; the total loss predictive value sigma Q of the n+1th hot blast stove production process Loss (n+1) Through a time sequence mode, the X Q can also be obtained (1% -30%) according to the state of the hot blast stove Wind (n+1) The unit is Mj/furnace; the comprehensive utilization coefficient K is 0.2-0.75 according to different types of gas and different exhaust temperatures.
Compared with the prior art, the invention has the following advantages:
1. the hot blast stove gas consumption prediction method based on hot blast stove cooling and heating judgment is used for a combustion gas prediction system of an intelligent hot blast stove control system, provides a measurement and calculation method of hot blast stove waste heat in each stove burning and air supplying process, predicts the stove burning gas quantity of the next hot blast stove according to a waste heat measurement and calculation result, and provides technical support for accurate control of the hot blast stove.
2. According to the hot blast stove gas consumption prediction method based on hot blast stove cold and hot stove judgment, the gas heat load required by each combustion is predicted according to the cold and hot stove state, the stable hot blast temperature is ensured, the fuel consumption is reduced, and the hot blast stove burning consumption can be reduced by more than 5% by adopting the method.
Based on the reasons, the invention can be widely popularized in the fields of energy conservation and the like in the steel industry.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1, the invention provides a hot blast stove gas consumption prediction method based on hot blast stove cooling and heating judgment, which comprises the following steps:
s1, based on parameter vault temperature T Arch Temperature T of hot air Wind power Temperature T of exhaust gas Cigarette with smoke Judging the furnace condition state of the hot blast stove after the furnace is replaced;
s2, measuring and calculating residual heat after heat exchange of the hot blast stove according to the determined furnace condition state;
s3, predicting the gas quantity of the combustion furnace based on the state of the furnace condition according to the calculated residual heat quantity of the hot blast furnace.
In practice, as a preferred embodiment of the present invention, in the step S1, the dome temperature T is based on the parameter Arch Temperature T of hot air Wind power Temperature T of exhaust gas Cigarette with smoke The method for judging the furnace condition state of the hot blast stove after the stove replacement specifically comprises the following steps:
s11, in the air supply stage of the hot blast stove, cold air reaches hot air required by the blast furnace through heating of the checker bricks, the vault and the combustion chamber; in the blowing stage, dome temperature T Arch As the air supply progress gradually decreases, the temperature T of the vault Arch Is equal to the set air supply hot air temperature T Wind power plant When the air cooling device is used, the cold air just brings out the heat of the checker bricks, and the residual heat of the checker bricks is the same as the residual heat before combustion and heating and is in a saturated state; in the saturated state, the dome temperature T is due to the further air supply required by the process Arch Further reducing the temperature T of the hot air of the air supply below the set temperature T Wind power plant T, i.e Arch <T Wind power plant Judging the state of the furnace after furnace change as a cold furnace;
s12, otherwise, because the air supply time and the air supply quantity are lower than the vault temperature T Arch T, i.e Arch ≥T Wind power plant And judging that the state of the furnace after furnace changing is a hot furnace when the residual heat of the checker bricks is in a supersaturated state.
In a specific implementation, as a preferred embodiment of the present invention, in the step S2, the residual heat after heat exchange of the hot blast stove is measured according to the determined furnace condition state, and the method specifically includes:
s21, calculating residual heat after heat exchange of the hot blast stove according to a heat balance theory, wherein a calculation formula is as follows:
Q residual (n) ＝Q Receiving (n) -Q Branch (n)
Wherein Q is Residual (n) The residual heat of the hot blast stove after the nth air supply and stove change is expressed as Mj/stove; q (Q) Receiving (n) The total heat quantity of the furnace burning process of the nth hot blast furnace is expressed as Mj/furnace; q (Q) Branch (n) Indicating the total heat expenditure in the nth air supply process,the unit is Mj/furnace; in the embodiment, when the air supply is changed for the nth time, the residual heat Q of the hot blast stove Residual (n) If the result is positive, the furnace condition after furnace change is a hot furnace, and when the nth air supply is changed, the residual heat Q of the hot blast stove Residual (n) If the result is negative, the furnace condition after furnace change is a cold furnace.
S22, calculating total income heat Q of nth hot blast stove in burning process Receiving (n) The calculation formula is as follows:
Q receiving (n) ＝Q Chemical (n) +Q Object (n) +Q Remainder (n-1) -Q Cigarette (n) -Q Loss (n)
Wherein Q is Chemical (n) Indicating that the fuel is brought into chemical heat in the nth burning process; q (Q) Object (n) Representing the physical quantity of fuel and combustion air brought in the nth burning process; q (Q) Remainder (n-1) The residual heat after the n-1 th air supply and furnace change is expressed as Mj/furnace; q (Q) Cigarette (n) The heat brought by the flue gas in the nth burning process is shown; q (Q) Loss (n) Other heat loss in the nth burning process is represented;
s23, calculating total heat expenditure Q in the nth air supply process Branch (n) The calculation formula is as follows:
Q branch (n) ＝Q Wind (n) +Q’ Loss (n)
Wherein Q is Wind (n) Indicating that the nth air supply hot air brings out physical heat; q'. Loss (n) Indicating other heat losses during the nth air supply.
In practice, as a preferred embodiment of the present invention, in the step S2, the fuel is brought into the chemical heat Q in the nth burning process Chemical (n) The unit is Mj/furnace calculated according to the fuel combustion theory; the fuel and the combustion air are brought into the physical quantity Q in the nth burning process Object (n) Calculating according to an energy equation, wherein the unit is Mj/furnace; the flue gas in the nth burning process brings heat Q Cigarette (n) The unit is Mj/furnace according to the energy equation and the fuel combustion theory; other heat loss Q in the nth burning process Loss (n) The method comprises the steps of furnace body heat dissipation, incomplete fuel combustion loss and fuel leakage, and can be used for carrying out heat balance test calibration, and also can be used for taking (5% -20%) multiplied by Q according to the state of the hot blast stove Chemical (n) The unit is Mj/furnace; the nth air supply hot air brings out physical heat Q Wind (n) Calculating according to an energy equation, wherein the unit is Mj/furnace; other heat loss Q 'in the nth air supply process' Loss (n) Comprises furnace body heat dissipation and pipeline heat dissipation, can be used for heat balance test calibration, and can also be used for taking (3% -10%) multiplied by Q according to the state of the hot blast stove Wind (n) The unit is Mj/furnace.
In a specific implementation, as a preferred embodiment of the present invention, in the step S3, the method for predicting the burned gas amount based on the state of the furnace according to the measured residual heat of the hot blast stove specifically includes:
s31, predicting heat Q required by n+1th furnace change Chemical (n+1) The calculation formula is as follows:
Q chemical (n+1) ＝Q Wind (n+1) +Q Residual (n) +∑Q Loss (n+1)
Wherein Q is Wind (n+1) The predicted value of the heat output of the hot air of the (n+1) th furnace change is shown; sigma Q Loss (n+1) Indicating the predicted value of the total loss in the production process of the n+1th hot blast stove;
s32, predicting the heat load V required by the n+1th furnace change m(n+1) The calculation formula is as follows:
V m(n+1) ＝KQ chemical (n+1) /Q d
Wherein Q is d Indicating a low heating value of the gas used in Kj/Nm 3 The method comprises the steps of carrying out a first treatment on the surface of the K represents the comprehensive utilization coefficient.
In a specific embodiment of the present invention, in the step S3, the (n+1) -th furnace exchange hot air brings the predicted value Q of heat Wind (n+1) Predicting according to a time sequence mode or according to the burning states of other hot blast stoves, wherein the unit is Mj/stove; the total loss predictive value sigma Q of the n+1th hot blast stove production process Loss (n+1) Through a time sequence mode, the X Q can also be obtained (1% -30%) according to the state of the hot blast stove Wind (n+1) The unit is Mj/furnace; the comprehensive utilization coefficient K is 0.2-0.75 according to different types of gas and different exhaust temperatures.
The invention provides a hot blast stove gas consumption prediction method for judging hot blast stove cooling and heating, which comprises the following technical principles: the working mode of the hot blast stove is that combustion/air supply is alternately carried out, the influence of the residual heat of the hot blast stove on the next combustion gas amount is very large after each air supply, the hot blast stove heats the checker bricks through gas combustion chemical heat in the combustion period, after the temperature of the checker bricks is saturated, high-pressure air brought by a blast furnace blower is heated after the temperature of the checker bricks is changed to reach the target temperature, the high-pressure air enters the blast furnace to be smelted through a blast furnace surrounding pipe, the heat of the checker bricks is taken away by cold air for the hot blast stove after the heat exchange, when the air supply time is long, the heat of the checker bricks is excessively taken out when the air supply amount is large, the heat of the checker bricks is lower than the heat supply amount of the previous combustion process, the checker bricks are in a heat unsaturated state, the stove condition of the hot blast stove in the state is defined as a cold stove, otherwise, the residual heat of the checker bricks is in a supersaturated state when the air supply time is lower than the heat supply amount, and the stove condition of the hot blast stove is defined as a hot stove. The invention predicts the gas heat load required by each combustion according to the state of the cold and hot furnace in order to ensure the stability of the hot air temperature and reduce the fuel consumption at the same time.
Example 1
2580m of a certain factory 3 The blast furnace is provided with three hot blast stoves, and is an internal combustion type hot blast stove, the combustion mode adopts two-combustion one-feeding, the original combustion furnace adopts a conventional combustion method and a conventional fuel quantity control mode, the combustion gas is blast furnace gas, and the heat value is 800Kcal/Nm 3 The real-time flow is 100000Nm 3 And/h, the burning time is 120min, the previous air supply time is 99min, and the air supply quantity is 5000Nm 3 And/min, the air supply target is 1220 ℃, the vault temperature after temperature air supply is 1100 ℃, the current hot blast stove is judged to be a cold stove after stove change, the fuel quantity is required to be increased in the next period, and the heat loss Q of the hot blast stove after the stove change is predicted according to the method Residual (n) The heat quantity of the boiler is compensated in the next period of the boiler with the temperature of between-169901 Mj/boiler, and the air quantity of the boiler in the next period is 5000Nm according to the working state of other hot blast stoves and the forward running condition of the blast furnace 3 If the air supply target is 1220 ℃ and the air supply time is 87min, the heat supply quantity of the next period is predicted to be 854504 Mj/furnace, and the coal gas load vm=127766Nm 3 The time of burning the furnace for 120min can be satisfied, and 100000Nm is still adopted 3 The burning time is prolonged to 153min to meet the heat demand, so that the heat dissipation loss and smoke exhaust loss in the operation process are increased by 12.3%.
Example 2
2580m of a certain factory 3 The blast furnace is provided with three hot blast stoves, is an internal combustion type hot blast stove, adopts a combustion mode of two combustion and one feeding, adopts a conventional combustion method and a conventional fuel quantity control mode in the original combustion state, and adopts the combustion gas which is blast furnace gas with the heat value of 800Kcal/Nm 3 The real-time flow is 100000Nm 3 And/h, the burning time is 120min, the previous air supply time is 76min, and the air supply quantity is 5000Nm 3 And/min, the air supply target is 1220 ℃, the vault temperature after temperature air supply is 1100 ℃, the current hot blast stove is judged to be a cold stove after stove change, the fuel quantity is required to be increased in the next period, and the heat loss Q of the hot blast stove after the stove change is predicted according to the method Residual (n) The heat quantity of 11086 Mj/furnace is reduced in the next period, and the air quantity of the next period is 5000Nm according to the working state of other hot blast stoves and the forward running condition of the blast furnace 3 If the air supply target is 1220 ℃ and the air supply time is 87min, the heat supply quantity in the next period is predicted to be 673517 Mj/furnace, and the coal gas load vm= 92469Nm 3 The time of burning the furnace for 120min can be satisfied, and 100000Nm is still adopted 3 And (3) the burning load per hour, the burning time is 110min, and the furnace can be replaced, if a burning system of 120min is still utilized, the energy loss is 5.2%.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. A hot blast stove gas consumption prediction method based on hot blast stove cooling and heating judgment is characterized by comprising the following steps:
based on the parameter dome temperature T Arch Temperature T of hot air Wind power Temperature T of exhaust gas Cigarette with smoke Judging the furnace condition state of the hot blast stove after the furnace is replaced;
according to the determined furnace condition state, measuring and calculating the residual heat after heat exchange of the hot blast stove;
and predicting the gas amount of the combustion furnace based on the state of the furnace condition according to the calculated residual heat of the hot blast furnace.
2. The hot blast stove gas consumption prediction method based on hot blast stove cooling and heating judgment according to claim 1, wherein the parameter dome temperature T is based on Arch Temperature T of hot air Wind power Temperature T of exhaust gas Cigarette with smoke The method for judging the furnace condition state of the hot blast stove after the stove replacement specifically comprises the following steps:
in the air supply stage of the hot blast furnace, cold air reaches hot air required by the blast furnace through heating of the checker bricks, the vault and the combustion chamber; in the blowing stage, dome temperature T Arch As the air supply progress gradually decreases, the temperature T of the vault Arch Is equal to the set air supply hot air temperature T Wind power plant When the heat quantity of the checker bricks is the same as the heat quantity of the checker bricks before combustion and heating, the checker bricks are in a saturated state; in the saturated state, the air supply is continued due to the technological requirement, so that the temperature T of the vault Arch Further reducing the temperature T of the hot air of the air supply below the set temperature T Wind power plant T, i.e Arch <T Wind power plant Judging the state of the furnace after furnace change as a cold furnace;
when the air supply time and the air supply quantity are lower than the vault temperature T Arch T, i.e Arch ≥T Wind power plant And judging that the state of the furnace after furnace changing is a hot furnace when the residual heat of the checker bricks is in a supersaturated state.
3. The method for predicting the gas consumption of the hot blast stove based on the judgment of the cold and hot blast stove according to claim 1, wherein the method for measuring and calculating the residual heat after heat exchange of the hot blast stove according to the judged state of the stove is characterized by comprising the following steps:
according to the heat balance theory, the residual heat after heat exchange of the hot blast stove is calculated, and the calculation formula is as follows:
Q residual (n) ＝Q Receiving (n) -Q Branch (n)
Wherein Q is Residual (n) The residual heat of the hot blast stove after the nth air supply and stove change is expressed as Mj/stove; q (Q) Receiving (n) The total heat quantity of the furnace burning process of the nth hot blast furnace is expressed as Mj/furnace; q (Q) Branch (n) Indicating the total heat expenditure of the nth air supply process, wherein the unit is Mj/furnace;
calculating total income heat Q of nth hot blast stove in burning process Receiving (n) The calculation formula is as follows:
Q receiving (n) ＝Q Chemical (n) +Q Object (n) +Q Remainder (n-1) -Q Cigarette (n) -Q Loss (n)
Wherein Q is Chemical (n) Indicating that the fuel is brought into chemical heat in the nth burning process; q (Q) Object (n) Representing the physical quantity of fuel and combustion air brought in the nth burning process; q (Q) Remainder (n-1) The residual heat after the n-1 th air supply and furnace change is expressed as Mj/furnace; q (Q) Cigarette (n) The heat brought by the flue gas in the nth burning process is shown; q (Q) Loss (n) Other heat loss in the nth burning process is represented;
calculating total heat expenditure Q in nth air supply process Branch (n) The calculation formula is as follows:
Q branch (n) ＝Q Wind (n) +Q’ Loss (n)
Wherein Q is Wind (n) Indicating that the nth air supply hot air brings out physical heat; q'. Loss (n) Indicating other heat losses during the nth air supply.
4. A method for predicting gas consumption of a hot blast stove based on hot blast stove cooling and heating judgment according to claim 3, wherein the residual heat Q of the hot blast stove after the nth blast change Residual (n) If the result is positive, the furnace condition after furnace change is a hot furnace, and when the nth air supply is changed, the residual heat Q of the hot blast stove Residual (n) If the result is negative, the furnace condition after furnace change is a cold furnace.
5. A hot blast stove gas consumption prediction method based on hot blast stove cold and hot stove judgment according to claim 3, characterized in that the nth burning process fuel is brought into chemical heat Q Chemical (n) The unit is Mj/furnace calculated according to the fuel combustion theory; the fuel and the combustion air are brought into the physical quantity Q in the nth burning process Object (n) Calculating according to an energy equation, wherein the unit is Mj/furnace; the flue gas in the nth burning process brings heat Q Cigarette (n) The unit is Mj/furnace according to the energy equation and the fuel combustion theory; other heat loss Q in the nth burning process Loss (n) Comprises furnace body heat dissipation, furnace body heat accumulation, incomplete combustion loss of fuel and fuel leakage, can be used for heat balance test calibration, and can also be used for taking (5% -20%) x Q according to the state of the hot blast stove Chemical (n) The unit is Mj/furnace; the nth air supply hot air brings out physical heat Q Wind (n) Calculating according to an energy equation, wherein the unit is Mj/furnace; other heat loss Q 'in the nth air supply process' Loss (n) Comprises furnace body heat dissipation and pipeline heat dissipation, can be used for heat balance test calibration, and can also be used for taking (3% -10%) multiplied by Q according to the state of the hot blast stove Wind (n) The unit is Mj/furnace.
6. The hot blast stove gas consumption prediction method based on hot blast stove cooling and heating judgment according to claim 1, wherein the prediction of the stove gas amount based on the stove condition state according to the measured residual heat of the hot blast stove specifically comprises:
predicting heat quantity Q required by n+1th furnace change Chemical (n+1) The calculation formula is as follows:
Q chemical (n+1) ＝Q Wind (n+1) +Q Residual (n) +∑Q Loss (n+1)
Wherein Q is Wind (n+1) The predicted value of the heat output of the hot air of the (n+1) th furnace change is shown; sigma Q Loss (n+1) Indicating the predicted value of the total loss in the production process of the n+1th hot blast stove;
predicting the heat load V required by the n+1th furnace change m(n+1) The calculation formula is as follows:
V m(n+1) ＝KQ chemical (n+1) /Q d
Wherein,Q d indicating a low heating value of the gas used in Kj/Nm 3 The method comprises the steps of carrying out a first treatment on the surface of the K represents the comprehensive utilization coefficient.
7. The hot blast stove gas consumption prediction method based on hot blast stove cooling and heating judgment according to claim 6, wherein the n+1th stove changing hot blast brings out a heat prediction value Q Wind (n+1) Predicting according to a time sequence mode or according to the burning state of the same hot blast stove, wherein the unit is Mj/stove; the total loss predictive value sigma Q of the n+1th hot blast stove production process Loss (n+1) Through a time sequence mode, the X Q can also be obtained (1% -30%) according to the state of the hot blast stove Wind (n+1) The unit is Mj/furnace; the comprehensive utilization coefficient K is 0.2-0.75 according to different types of gas and different exhaust temperatures.
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