CN117628916A - System and method for predicting cooling flue gas outlet temperature of sintering belt cooler - Google Patents
System and method for predicting cooling flue gas outlet temperature of sintering belt cooler Download PDFInfo
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- CN117628916A CN117628916A CN202311580081.2A CN202311580081A CN117628916A CN 117628916 A CN117628916 A CN 117628916A CN 202311580081 A CN202311580081 A CN 202311580081A CN 117628916 A CN117628916 A CN 117628916A
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- 238000001816 cooling Methods 0.000 title claims abstract description 109
- 238000005245 sintering Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 43
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 239000003546 flue gas Substances 0.000 title claims abstract description 36
- 239000002918 waste heat Substances 0.000 claims abstract description 23
- 239000000779 smoke Substances 0.000 claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 239000002912 waste gas Substances 0.000 claims abstract description 11
- 239000007787 solid Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 13
- 238000004364 calculation method Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 238000013178 mathematical model Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a cooling smoke outlet temperature prediction system and method of a sintering belt cooler, and belongs to the technical field of sintering energy conservation and emission reduction. According to production operation data of a cooling system and a waste heat system of the belt cooler, establishing a belt cooler air leakage rate and a thermal state parameter forecasting system under different sintering process parameters and different working conditions so as to forecast the temperature of ore discharge flue gas of the belt cooler, further adopting a belt cooler heat source parameter forecasting system through unsteady state gas-solid heat exchange analysis to forecast the temperature and flow of waste gas of the belt cooler in advance, and carrying out blast air quantity adjustment of the belt cooler through corresponding control, thereby realizing that the temperature of the ore discharge flue gas of the belt cooler reaches a safe temperature; the instability of manual control of the temperature of the cooling smoke outlet of the existing belt cooler is overcome, and the purpose of saving the power consumption of the cooling fan under the condition that the temperature of the cooling smoke outlet of the belt cooler is accurately predicted is achieved.
Description
Technical Field
The invention relates to the technical field of sintering energy conservation and emission reduction, in particular to a cooling smoke outlet temperature prediction system and method of a sintering belt type cooler.
Background
In steel production, sintering production is one of important processes, and provides high-quality raw materials for blast furnace ironmaking. The sintering process is divided into three parts of ignition, sintering and cooling, wherein the temperature of the sintered ore is about 750-800 ℃ when the sintered ore is discharged from the tail after the sintered ore is sintered on a sintering machine, and the red-hot sintered ore is cooled to below 120 ℃ according to the safety regulations of metallurgical enterprises. The existing sintering plants mostly adopt off-machine cooling, hot sinter is unloaded at the tail of the sintering machine and enters a cooling machine trolley, and the hot sinter is cooled by forced convection heat exchange with cold air blown in by a blower. The cooling fan is basically adjusted according to the ore discharging temperature during the production of the sintering belt type cooler, and when the ore discharging temperature exceeds the safe temperature, the sintering belt type cooler is required to be stopped for forced cooling, so that the stable operation of production is seriously affected. Therefore, the prediction of the temperature of the cooling flue gas outlet of the sintering belt cooler is very necessary, the stable operation of production can be ensured, and the purpose of reducing the power consumption of the cooling fan can be achieved.
Through search, patent publication No.: CN109682220a, publication date: the invention is provided with the following creative names: an air volume control device of a sinter cooling apparatus, the application including a sinter cooling apparatus having an ore feed port to which sinter obtained by heating by an upstream sinter apparatus is fed and an ore discharge port from which sinter is discharged to a downstream device and rotating in a circumferential direction; a blower device for supplying cooling air to the storage container; and an ore drawing machine for drawing out the sintered ore from the ore outlet in association with the rotation of the storage container; the air volume control device for the sintering cooling equipment is provided with an input data collection unit, an input data change prediction unit, a predicted ore-drawing temperature calculation unit, an estimated ore-drawing temperature calculation unit, and an air volume calculation unit. However, this application has the disadvantage that: (1) The air loss generated by air leakage of the cooler is ignored in the cooling calculation; (2) The related cooler is a ring cooler, and the blast and cooling modes and the like are different from those of the belt cooler.
Patent publication No.: CN104266500a, application publication date: 1 month 7 of 2015, the invention is named: a method for predicting and regulating heat source parameters of a cooler based on the thermal state of a sintering process is disclosed, which adopts a sintering machine thermal state parameter prediction system and a sintering cooler heat source parameter prediction system to realize the prediction of the temperature and flow of waste gas of the sintering cooler, and finally regulates the temperature and flow of flue gas at the inlet of a waste heat boiler. However, this application has the disadvantage that: (1) The temperature and flow of the waste gas of the sintering cooler are predicted in advance, corresponding operation parameters are adjusted, but the prediction of the ore discharging temperature of the sintering ore is not performed; (2) The waste heat recovery system related to the chiller is not a cooling system.
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the defect of the prior art in predicting the temperature of a sintering belt cooler, the invention provides a system and a method for predicting the temperature of a cooling smoke outlet of the sintering belt cooler; the invention realizes automatic prediction, and the predicted flue gas outlet temperature is more accurate, overcomes the instability of manual control of the temperature of the cooling flue gas outlet of the existing belt cooler, and achieves the purpose of saving the power consumption of the cooling fan.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the invention relates to a cooling smoke outlet temperature prediction system of a sintering belt cooler, which comprises the following units:
1) The hot state parameter forecasting unit of the belt cooler: according to a laboratory numerical model and a cooling machine air quantity test, combining actual operation data of a sintering cooling machine system production, establishing different cooling process parameters, cooling air quantity and cooling temperature parameter prediction models under different working conditions, and calculating key parameters of a cooling process by calculating cooling air quantity loss, cooling material layer data and cooling process related process parameters;
2) The heat source parameter forecasting unit with the cold machine comprises: the air leakage rate, the thickness of the material layer and the temperature of the smoke hood of the cold air box of the cold air system are respectively calculated by collecting the cold air quantity, so that the optimal blasting parameters are optimized, and the parameters of the ore-discharging waste gas with cold outlet are predicted;
3) And a cold air leakage rate detection unit: and predicting the cold-carrying cooling ore removal temperature according to the inlet flue gas temperature and flue gas flow of the waste heat boiler and the flue gas parameters predicted by the heat source parameter prediction unit of the cold-carrying machine.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
according to the production operation data of the cooling system and the waste heat system of the belt cooler, a belt cooler air leakage rate and a thermal state parameter forecasting system under different sintering process parameters and different working conditions are established to forecast the temperature of ore discharge flue gas of the belt cooler, the temperature of the waste gas of the belt cooler and the flow are forecasted in advance by adopting a belt cooler heat source parameter forecasting system through unsteady state gas-solid heat exchange analysis, and the blast air quantity of the belt cooler is adjusted by corresponding control, so that the temperature of the ore discharge flue gas of the belt cooler reaches a safe temperature; the instability of manual control of the temperature of the cooling smoke outlet of the existing belt cooler is overcome, and the purpose of saving the power consumption of the cooling fan under the condition that the temperature of the cooling smoke outlet of the belt cooler is accurately predicted is achieved.
Drawings
FIG. 1 is a schematic diagram of a calculation interface of an air leakage rate system according to the present invention;
FIG. 2 is a schematic diagram of a belt cooler cooling temperature prediction interface in accordance with the present invention;
FIG. 3 is a schematic diagram of a cooling exhaust flue gas temperature prediction interface of a belt cooler in the present invention.
Detailed Description
For a further understanding of the present invention, the present invention will be described in detail with reference to the drawings and examples.
Referring to fig. 1, a cooling flue gas outlet temperature prediction system of a sintering belt cooler of the present embodiment is applied to a sintering cooling process in sintering production, in which a cooling fan, a waste heat boiler, a temperature and negative pressure measuring instrument, a DCS control system, a communication link, a database server and the like are arranged in hardware equipment of the sintering cooler; the software comprises programming software, picture editing software, a PI database and the like.
The embodiment specifically comprises the following units:
1) The hot state parameter forecasting unit of the belt cooler: according to a laboratory numerical model and a cooling machine air quantity test, combining actual operation data of a sintering cooling machine system production, establishing different cooling process parameters, cooling air quantity and cooling temperature parameter prediction models under different working conditions, and calculating to obtain cooling process parameters by calculating cooling air quantity loss and cooling material layer data process parameters;
2) The heat source parameter forecasting unit with the cold machine comprises: calculating the air leakage rate of the belt cooling system, the thickness of the belt cooling material layer and the temperature of the hood of the belt cooling box by collecting the amount of the belt cooling air, and then optimizing the proper blast parameters and forecasting the parameters of the ore discharging waste gas with the cooling outlet;
3) And a cold air leakage rate detection unit: and according to the inlet flue gas temperature and flue gas flow of the waste heat boiler and the waste gas parameters predicted by the belt cooler heat source parameter prediction unit, predicting the cold-carrying cooling ore discharge temperature.
According to the embodiment, the total cooling air quantity required by the whole cooling system is calculated by measuring the air leakage rate of the sintering cooling system, and then the expected ore discharging temperature is calculated according to the machine speed and the material layer thickness data of the belt type cooler, so that the ore discharging cooling temperature of the sintering ore of the sintering belt type cooler is improved to meet the safety requirement.
Referring to fig. 1, the calculation interface of the air leakage rate system includes parameters required for detecting the air leakage rate of the cooling machine: low pressure steam parameters of the waste heat boiler; waste heat high pressure boiler steam parameters; waste heat flue gas inlet flow, pressure and temperature; waste heat flue gas outlet flow, pressure and temperature; outlet air quantity of the air blower with cold air; exhaust flow with cold chimney.
Calculating the air leakage rate of the belt cooling system according to the related measured data of the belt cooler and the measured data of the waste heat utilization system:
firstly, establishing a boiler heat balance relation, and aiming at checking the recovered smoke volume to obtain relatively accurate recovered smoke volume, and then according to conservation of mass, the recovered smoke volume is equal to the exhaust smoke volume of the boiler, namely the circulating air volume of a circulating fan; wherein the heat income term of the boiler is calculated as three parts, namely the heat quantity Q carried by the low-temperature waste gas from the belt cooler f ＝c p ·Q v Δt, heat Q brought by boiler injection s ＝(h-h 0 )·Q vs Heat Q carried by water injected into desuperheater j ＝(Q j +Q s +Q f ) X 0.028%; the heat expenditure of the boiler in the production process comprises three items, namely: heat Q carried away by steam generated by boiler z ＝h z ·Q zv The method comprises the steps of carrying out a first treatment on the surface of the Heat Q taken away by low-temperature waste gas at boiler outlet fc ＝c p ·Q vf Δt; heat Q carried away by boiler blow-down and surface loss bp The method comprises the steps of carrying out a first treatment on the surface of the The boiler heat balance is calculated as Q j +Q s +Q f ＝Q z +Q fc +Q bp ；
Secondly, calculating the air leakage rate according to the air quantity balance; the system with the cooler consists of a fan, a pipeline (comprising a circulating fan and a blower), a cooler, a chimney, a pipeline and a waste heat boiler, wherein the total air quantity brought into the boiler is the sum of the circulating fan and the blower; the air output of the high-temperature section of the cooling machine is the sum of the air output taken away by the waste gas recovery part and the chimney, and the heat is taken away by the chimney: q (Q) fq1 ＝c p ·L q1 Δt; according to the mass balance, the total air quantity of the inlet system=the total air quantity of the outlet system, and the total air quantity of the inlet system with the cooling machine=the air quantity of the exhaust air quantity and the air leakage quantity of the system with the cooling machine;
thirdly, calculating the heat balance of the belt cooler, wherein the heat of the belt cooler is composed of three parts, namely: heat q=c carried by sinter at tail of sintering trolley p m.DELTA.t; heat Q carried by circulating air of exhaust gas from boiler outlet xr ＝c p ·L xq Δt; with the heat of the cooler blast.
The air leakage rate prediction process comprises the following steps:
step a, collecting data required by a cooling system and a waste heat boiler, establishing a database, and cleaning the data to obtain a classification value;
step b, performing boiler inlet heat calculation and boiler outlet heat calculation in advance according to all data, so as to solve the circulating flue gas flow according to heat balance;
step c, calculating the flow of the chimney according to the actual measurement data;
step d, calculating the ratio of the calculated total blast volume with cooling to all the air output volumes with cooling, thereby obtaining the air leakage rate of the system with cooling;
step e, obtaining the air leakage rate under different working conditions according to the factors such as the specific heat function of the flue gas and the like and the change of the flue gas temperature under different working conditions;
and f, carrying out parameter re-optimization according to the actual use data.
The cooling temperature prediction of the belt cooler is shown in fig. 2, and key parameters of the acquired cooling process of the belt cooler are as follows: (1) the speed of the belt cooler; (2) the thickness of the cold material layer is provided; (3) the temperature of the exhaust gas with the cold smoke cover; (4) and the waste heat circulates in the hot air inlet position. The sinter cooler blast parameters include cooling air temperature and flow. The sinter cooler outlet exhaust parameters include exhaust temperature and flow. The blast medium is normal temperature cooling air, and the 2# and 3# cold blast air is low temperature waste smoke and cold blast air volume after heat exchange of the waste heat boiler.
The prediction of the cooling discharge flue gas temperature of the belt cooler is shown in fig. 3, parameters required by a mathematical model of the gas-solid heat exchange process are the thickness of a material layer of the belt cooling, the running speed of a trolley of the belt cooling, the actual distance of the belt cooling from the material layer, the machine speed of the belt cooling is an actual measured value, and the cooling air quantity of the belt cooling is a calculated value.
The calculation formula is as follows:
knowing the trolley speeds v, thk, solving the flue gas outlet temperature formulas of different distances:
T＝b 1j +b 2j ×L+b 3j ×thk+b 4j ×L/thk+b 5j ×L×thk/v(j＝1,2,3,4,5,6,7,8)
when l=0-6 m, j=1;
when l=6-12 m, j=2;
when l=12.5-18 m, j=3;
when l=18-24 m, j=4;
when l=24-30 m, j=5;
when l=30-36 m, j=6;
when l=36.5-42 m, j=7;
when l=42-48 m, j=8.
Formula coefficient table
The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (8)
1. The cooling flue gas outlet temperature prediction system of the sintering belt cooler is characterized by comprising the following units:
1) The hot state parameter forecasting unit of the belt cooler: according to a laboratory numerical model and a cooling machine air quantity test, combining actual operation data of a sintering cooling machine system production, establishing different cooling process parameters, cooling air quantity and cooling temperature parameter prediction models under different working conditions, and calculating key parameters of a cooling process by calculating cooling air quantity loss, cooling material layer data and cooling process related process parameters;
2) The heat source parameter forecasting unit with the cold machine comprises: the air leakage rate, the thickness of the material layer and the temperature of the smoke hood of the cold air box of the cold air system are respectively calculated by collecting the cold air quantity, so that the optimal blasting parameters are optimized, and the parameters of the ore-discharging waste gas with cold outlet are predicted;
3) And a cold air leakage rate detection unit: and predicting the cold-carrying cooling ore removal temperature according to the inlet flue gas temperature and flue gas flow of the waste heat boiler and the flue gas parameters predicted by the heat source parameter prediction unit of the cold-carrying machine.
2. A method for predicting the temperature of a cooling smoke outlet of a sintering belt cooler is characterized by comprising the following steps: the system of claim 1 is utilized to establish different sintering process parameters, the air leakage rate of the belt cooler under different working conditions and a thermal state parameter forecasting system according to production operation data of the cooling system and the waste heat system of the belt cooler so as to forecast the ore discharge temperature of the belt cooler, realize the advanced forecasting of the ore discharge flue gas temperature of the sintering belt cooler, and finally enable the ore discharge temperature of the belt cooler to reach the safety requirement by adjusting the flue gas of the blast fan of the belt cooler.
3. The method for predicting the cooling smoke outlet temperature of the sintering belt cooler according to claim 2, wherein the method comprises the following steps: the key parameters of the cooling process of the belt comprise: the speed of the belt cooler, the thickness of the belt cooling material layer, the temperature of the exhaust gas of the belt cooling smoke cover and the position of the waste heat circulation hot air inlet.
4. A method for predicting the cooling flue gas outlet temperature of a sinter strand cooler as claimed in claim 3, wherein: the calculated heat source parameters of the cooling machine are forecasted by adopting a two-dimensional gas-solid heat exchange process mathematical model.
5. The method for predicting the cooling flue gas outlet temperature of the sintering belt cooler according to claim 4, wherein the method comprises the following steps: parameters required by the mathematical model of the two-dimensional gas-solid heat exchange process are the thickness of the material layer with cold and the actual flow of the cooling with cold, wherein the thickness of the material layer is an actual measurement value, and the air quantity of the cooling with cold is a calculation value.
6. The method for predicting the cooling smoke outlet temperature of the sintering belt cooler according to claim 5, wherein the method comprises the following steps: the blast parameters of the belt cooler comprise cooling air temperature and flow.
7. The method for predicting the cooling flue gas outlet temperature of the sintering belt cooler according to claim 6, wherein the method comprises the following steps: the outlet belt cold ore removal exhaust gas parameters include exhaust gas temperature and flow.
8. The method for predicting the cooling flue gas outlet temperature of a sintering belt cooler according to claim 7, wherein: the parameters required by detecting the air leakage rate of the belt cooler include: low pressure steam parameters of the waste heat boiler; waste heat high pressure boiler steam parameters; waste heat flue gas inlet flow, pressure and temperature; waste heat flue gas outlet flow, pressure and temperature; outlet air quantity of the air blower with cold air; exhaust flow with cold chimney.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311580081.2A CN117628916A (en) | 2023-11-24 | 2023-11-24 | System and method for predicting cooling flue gas outlet temperature of sintering belt cooler |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311580081.2A CN117628916A (en) | 2023-11-24 | 2023-11-24 | System and method for predicting cooling flue gas outlet temperature of sintering belt cooler |
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