CN114326381B - Modeling and control method for steelmaking steam balance - Google Patents
Modeling and control method for steelmaking steam balance Download PDFInfo
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- CN114326381B CN114326381B CN202011055296.9A CN202011055296A CN114326381B CN 114326381 B CN114326381 B CN 114326381B CN 202011055296 A CN202011055296 A CN 202011055296A CN 114326381 B CN114326381 B CN 114326381B
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- 238000009628 steelmaking Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000003068 static effect Effects 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims description 66
- 230000001105 regulatory effect Effects 0.000 claims description 21
- 238000003860 storage Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000005338 heat storage Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 238000009834 vaporization Methods 0.000 claims description 2
- 230000008016 vaporization Effects 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 claims 2
- 238000007664 blowing Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 3
- 238000004939 coking Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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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Abstract
The invention relates to a modeling and control method for steelmaking steam balance, and belongs to the technical field of steelmaking. The invention comprises the following steps: step one: establishing a static steam control model: step two: establishing a dynamic steam control model: step three: recording an upper pressure limit and a lower pressure limit of the heat accumulator and the maximum heat accumulating capacity of the heat accumulator; step four: the flow rate of the steam delivery is controlled: the flow rate and the delivery time of the delivered steam are controlled, and the pressure of the heat accumulator is controlled to be maintained. The invention realizes automatic steam balance without manual intervention.
Description
Technical Field
The invention relates to a modeling and control method for steelmaking steam balance, and belongs to the technical field of steelmaking.
Background
The iron and steel industry is a high energy consumption industry, has a considerable proportion in the total energy consumption of the national industry, and is an important diffusion source for causing environmental pollution, so that the energy conservation and emission reduction of the iron and steel production are realized, and the iron and steel production has great economic and social benefits. The actual production process of a large-scale steel-iron enterprise can be divided into units of sintering, coking, ironmaking, steel making, steel rolling and the like. Wherein the production units for coking, ironmaking and steel making produce coke oven gas, blast furnace gas and converter gas as by-products in addition to specific products. The byproduct gas still has higher heat value, is an important secondary energy source, and can cause energy waste and environmental pollution if not reasonably utilized. Typically, these byproduct gases are re-entered as fuel into the production system for production, or into the boiler system for steam production to meet the steam requirements of the production plant and for self-generation by the generator.
The automatic steam balance can not be realized by the existing steelmaking steam production and elimination, and manual intervention is needed.
Disclosure of Invention
The invention aims to provide a method for realizing automatic steam balance in steelmaking.
In order to achieve the above object, the present invention provides the following technical solutions: a modeling method for steelmaking steam balance based on steam generation amount of a multi-rotary furnace vaporization cooling system and steam consumption amount of a multi-RH furnace, steam storage amount of a multi-heat storage station system and steam delivery system comprises the following steps:
step one: establishing a static steam control model:
the static model includes the following recorded data: the production condition of the converter, the production condition of the RH furnace, the steel grade produced by each RH furnace, the production section of the steelmaking, the initial pressure of the heat accumulator, the steam delivery time and the limit value of the cylinder separating pressure during the steam delivery;
step two: establishing a dynamic steam control model:
based on the theory of the static model, according to the pressure and the steam storage condition of the actual heat accumulator, obtaining steelmaking steam production data and steelmaking steam consumption data;
step three: recording an upper pressure limit and a lower pressure limit of the heat accumulator and the maximum heat accumulating capacity of the heat accumulator;
step four: the flow rate of the steam delivery is controlled: the flow rate and the delivery time of the delivered steam are controlled, and the pressure of the heat accumulator is controlled to be maintained.
The further improvement of the scheme is that: and recording the upper pressure limit of the heat accumulator according to the steam recovery pressure of the converter and the resistance loss of the pipeline, and recording the lower pressure limit of the heat accumulator according to the steam pressure used by an RH furnace user and the resistance loss of the pipeline.
The further improvement of the scheme is that: the steelmaking steam production data comprise a steam production working period, a steam production converting time, a steam production daily treatment capacity, a furnace steam production capacity, an average steam production capacity in continuous period hours, an average steam production capacity in daily hours and a daily steam production capacity; the steelmaking steam consumption data comprises a steam consumption working period, a steam consumption converting time, a steam consumption daily treatment capacity, a furnace steam consumption capacity, an average steam consumption capacity in continuous period hours, an average steam consumption capacity in daily hours and a daily steam consumption capacity,
the beneficial effects of the invention are as follows: automatic steam balance is realized without manual intervention.
Detailed Description
Examples
A modeling method for the balance of steam production and elimination in steelmaking is based on the steam production of a multi-converter evaporative cooling system and the steam consumption of a multi-RH furnace, the steam storage of a multi-heat storage station system and a steam delivery system, and comprises 5 existing converters, wherein one converter comprises 3 converters of 150 tons, 2RH (1 and 2RH respectively), two converters of 2 tons of 250 tons and one RH (3 RH).
The method comprises the following steps:
step one: establishing a static steam control model:
the static model includes the following recorded data: the production condition of the converter, the production condition of the RH furnace, the steel grade produced by each RH furnace, the production section of the steelmaking, the initial pressure of the heat accumulator, the steam delivery time and the limit value of the cylinder separating pressure during the steam delivery;
step two: establishing a dynamic steam control model:
based on the theory of the static model, according to the pressure and the steam storage condition of the actual heat accumulator, obtaining steelmaking steam production data and steelmaking steam consumption data;
the steelmaking steam production data are as follows:
steelmaking steam consumption data
Step three: recording an upper pressure limit and a lower pressure limit of the heat accumulator and the maximum heat accumulating capacity of the heat accumulator;
the upper limit of the pressure of the heat accumulator is obtained by the recovery pressure of the converter steam and the resistance loss of the pipeline, and the lower limit of the pressure of the heat accumulator is obtained by using the steam pressure and the resistance loss of the pipeline by an RH user, namely 2.1MPa. From this, the calculated maximum heat storage capacity of the heat storage device was about 44.7t with 1320m (total volume of the existing heat storage device).
Step four: the flow rate of the steam delivery is controlled: the flow rate and the delivery time of the delivered steam are controlled, and the pressure of the heat accumulator is controlled to be maintained.
According to the production condition of the converter and the smelting process conditions, the conditions are divided into the following conditions:
case one: 1. 2, 3, 4, 5 converters and 1, 2, 3RH simultaneously:
the pressure of the heat accumulator is 2.6MPa, 23.7t of steam is reserved for standby, the maximum steam yield of one blowing is 11.3 t/furnace×3 furnace+19.5 t/furnace×2 furnace=72.9 t, and the maximum steam consumption is 15 t/furnace×2 furnace (15 t of RH per furnace air consumption of 1 and 2 times of RH per furnace) +20 t/furnace×1 furnace (20 t of RH per furnace air consumption of 3 times of RH) =50 t. The RH furnace treatment time is 30 minutes, and the RH steam consumption in steelmaking is high due to the large steam yield of the system. The model calculates the delivered steam quantity to be 22.9t according to the production plan, the steam yield 72t and the RH steam consumption 50t during the production of the existing converter. The steam needs to be sent out (the pressure of a low-pressure steam pipe network of a company is 1.1 Mpa). And the amount of the delivered steam is delivered to an automatic control stage, the delivered steam is 22.9t, and the delivered time is 30 minutes in a single furnace. At this time, the PLC controls the steam delivery regulating valve mainly by flow regulation and the pressure control is auxiliary. The flow rate was adjusted at a flow rate set point of 44 t/hr while the pressure in the regenerator was not lower than 2.6Mpa.
And a second case: 1. 2, 3, 4 and 5 converters are produced simultaneously, and RH is produced simultaneously (steelmaking RH is mainly opened by RH No. 2 and RH is prepared) in 2 and 3 steps:
the pressure of the heat accumulator is 2.6MPa, 23.7t of steam is reserved for standby, the maximum steam yield of one blowing is 11.3 t/furnace×3 furnace+19.5 t/furnace×2 furnace=72.9 t, and the maximum steam consumption is 15 t/furnace×1 furnace (15 t of RH per furnace air consumption of No. 2) +20 t/furnace×1 furnace (20 t of RH per furnace air consumption of No. 3) =35 t. The RH furnace treatment time is 30 minutes, and the RH steam consumption in steelmaking is large due to the large steam yield of the system. The model calculates the output steam amount to be 37.9t according to the production plan, the steam yield 72.9t and the RH steam consumption 35t during the production of the existing converter, and the steam is required to be output (the pressure of a company low-pressure steam pipe network is 1.1 Mpa). And the amount of the delivered steam is delivered to an automatic control stage, the delivered steam is 37t, and the delivered time is 30 minutes in a single furnace. At this time, the PLC controls the steam delivery regulating valve mainly by flow regulation and the pressure control is auxiliary. The flow rate was adjusted at a flow rate set point of 75.8 t/hr while the pressure in the regenerator was not lower than 2.6Mpa.
And a third case: 1. 2, 3, 4 and 5 converters are produced simultaneously, and RH production is carried out:
the pressure of the heat accumulator is 2.6MPa, 23.7t of steam is reserved for standby, the maximum steam yield of one blowing is 11.3 t/furnace×3 furnace+19.5 t/furnace×2 furnace=72.9 t, and the maximum steam consumption is 20 t/furnace×1 furnace (No. 3RH air consumption per furnace 20 t) =20t. The RH furnace treatment time is 30 minutes, and the RH steam consumption in steelmaking is small due to the large steam yield of the system. The model calculates the outward steam amount to be 52.9t according to the production plan, the steam yield 72.9t and the RH steam consumption 20t during the production of the existing converter, and sends the outward steam amount to an automatic control stage, the outward steam amount is 52t, and the outward steam (the pressure of a company low-pressure steam pipe network is 1.1 Mpa) is required to be outward for 30 minutes in a single-furnace time. At this time, the PLC controls in such a manner that the first step regulating valve is fully opened, and when the amount of the supplied steam exceeds 30t, the steam flow regulating valve is automatically switched to flow regulation, and the flow rate is set at 20 t/hr. And the pressure of the heat accumulator cannot be lower than 2.6Mpa.
Case four: 1. 2, 3, 2 converters are produced, 4, 5 converters are produced simultaneously, and 1, 2 and 3RH are produced simultaneously:
the pressure of the heat accumulator is 2.6MPa, 23.7t of steam is reserved for standby, the maximum steam yield of one blowing is 11.3 t/furnace×2 furnace+19.5 t/furnace×2 furnace=59.6 t, and the maximum steam consumption is 15 t/furnace×2 furnace (15 t of RH per furnace air consumption of 1 and 2 times of RH per furnace air consumption of 15 t) +20 t/furnace×1 furnace (20 t of RH per furnace air consumption of 3 times of RH) =50 t. The RH furnace treatment time is 30 minutes, and the RH steam consumption in steelmaking is large because the steam yield of the system is large. The model is based on production plan, the gas yield of the existing converter is 59.6t, and the RH gas consumption is 50t. The RH steam consumption is 9.6t different from the steam yield of the converter. The maximum storage steam amount of the heat accumulator can reach 44.7t under the condition of 2.6Mpa and 3.1 Mpa. Whereas the regenerator also has the capacity to store steam 21 t. At this time, the PLC controls in such a manner that the first step of the regulating valve is fully closed, and when the storage pressure of the heat accumulator reaches 3.0MPa, the steam flow regulating valve controls the flow, and the flow is set at 50 t/hr. And the pressure of the heat accumulator cannot be lower than 2.6Mpa.
Case five: 1. 2, 3, 2 converters are produced, 4, 5 converters are produced simultaneously, and 2, 3RH is produced simultaneously:
the pressure of the heat accumulator is 2.6MPa, 23.7t of steam is reserved for standby, the maximum steam yield of one blowing is 11.3 t/furnace×2 furnace+19.5 t/furnace×2 furnace=59.6 t, and the maximum steam consumption is 15 t/furnace×1 furnace (15 t of RH per furnace air consumption of 1, 2 # RH per furnace) +20 t/furnace×1 furnace (20 t of RH per furnace air consumption of 3 # RH per furnace) =35 t. The RH furnace treatment time is 30 minutes, and the RH steam consumption in steelmaking is large because the steam yield of the system is large. The model is based on production plan, the gas yield of the existing converter is 59.6t, and the RH gas consumption is 35t. The amount of steam delivered was calculated to be 24.6t. The steam is sent out (the pressure of a company low-pressure steam pipe network is 1.1 Mpa) to a heat accumulator under the condition of 2.6Mpa. At this time, the PLC controls the steam delivery regulating valve mainly by flow regulation and the pressure control is auxiliary. The flow rate was adjusted at a flow rate set point of 49.2 t/hr while the pressure of the regenerator was not lower than 2.6Mpa.
Case six: 1. the 2, 3 converters are produced by 1 converter, the 4, 5 converters are produced simultaneously, and the 2, 3RH is produced simultaneously:
the pressure of the heat accumulator is 2.6MPa, 23.7t of steam is reserved for standby, the maximum steam yield of one blowing is 11.3 t/furnace×1 furnace+19.5 t/furnace×2 furnace=50.3 t, and the maximum steam consumption is 15 t/furnace×1 furnace (15 t of RH per furnace air consumption of 1, 2 # RH per furnace) +20 t/furnace×1 furnace (20 t of RH per furnace air consumption of 3 # RH per furnace) =35 t. The RH furnace treatment time is 30 minutes, and the RH steam consumption in steelmaking is large because the steam yield of the system is large. The model is based on the production plan, the steam yield of the existing converter during production is 50.3t, and the RH steam consumption is 35t. The amount of steam delivered was calculated to be 15.8t. The PLC controls the steam delivery (the pressure of the low-pressure steam pipe network of the company is 1.1 Mpa) in the following way, and the steam delivery regulating valve mainly regulates the flow and is controlled to be auxiliary. The flow rate was adjusted at a flow rate set point of 31.6 t/hr while the pressure in the regenerator was not lower than 2.6Mpa.
Case seven: 1. 2, 3, 1 converter production, 4, 5 converters, 1 converter production, 2, 3RH simultaneous production:
the pressure of the heat accumulator is 2.6MPa, 23.7t of steam is reserved for standby, the maximum steam yield of one blowing is 11.3 t/furnace×1 furnace+19.5 t/furnace×1 furnace=30.8 t, and the maximum steam consumption is 15 t/furnace×1 furnace (15 t of RH per furnace air consumption of 1, 2 # RH per furnace) +20 t/furnace×1 furnace (20 t of RH per furnace air consumption of 3 # RH per furnace) =35 t.
Case eight: 1. the 2, 3 converters have 3 converters to produce, the 4, 5 converters do not produce, and the 1 and 2RH simultaneously produce:
the pressure of the heat accumulator is 2.6MPa, 23.7t of steam is reserved for standby, the maximum steam yield of one blowing is 11.3 t/furnace×3furnace+ =33.9 t, and the maximum steam consumption is 15 t/furnace×2 furnace (15 t of RH per furnace consumption of 1 and 2) =30t. The RH furnace treatment time is 30 minutes, and the RH steam consumption in steelmaking is large because the system steam yield is small, and the pressure of a company low-pressure steam pipe network is 1.1Mpa. The model is based on the production plan, the steam yield of the existing converter during production is 33.9t, and the RH steam consumption is 30t. The amount of steam delivered was calculated to be 3.9t. The maximum stored steam quantity can reach 44.7t under the condition of pressing to 3.1 Mpa. Whereas the regenerator also has the capacity to store steam 21 t. At this time, the PLC controls in such a manner that the steam delivery control valve is completely closed and the steam is not delivered.
Case nine: 1. the 2, 3 converters have 3 converters to produce, the 4, 5 converters do not produce, and the No. 2RH produces:
the pressure of the heat accumulator is 2.6MPa, 23.7t of steam is reserved for standby, the maximum steam yield of one blowing is 11.3 t/furnace×3furnace+ =33.9 t, and the maximum steam consumption is 15 t/furnace×1 furnace (15 t of RH per furnace consumption of 1 and 2) =15t. The RH furnace treatment time is 30 minutes, and the RH steam consumption in steelmaking is smaller due to the smaller steam yield of the system. The model is based on the production plan, the steam yield of the existing converter during production is 33.9t, and the RH steam consumption is 15t. The amount of steam delivered was calculated to be 18.9t. The PLC controls the steam delivery (the pressure of the low-pressure steam pipe network of the company is 1.1 Mpa) in the following way, and the steam delivery regulating valve mainly regulates the flow and is controlled to be auxiliary. The flow rate was adjusted at a flow rate set point of 37.8 t/hr while the pressure in the regenerator was not lower than 2.6Mpa.
The invention is not limited to the above embodiments, and all technical solutions formed by equivalent substitution fall within the protection scope of the invention.
Claims (3)
1. The modeling and control method for steelmaking steam balance is based on the steam production amount of a multi-rotary furnace vaporization cooling system and the steam consumption amount of a multi-RH furnace, the steam storage amount of a multi-heat storage station system and the steam delivery system, and is characterized by comprising the following steps:
step one: establishing a static steam control model:
the static steam control model includes the following recorded data: the production condition of the converter, the production condition of the RH furnace, the steel grade produced by each RH furnace, the production section of the steelmaking, the initial pressure of the heat accumulator, the steam delivery time and the limit value of the cylinder separating pressure during the steam delivery;
step two: establishing a dynamic steam control model:
based on the theory of a static steam control model, according to the pressure and the steam storage condition of an actual heat accumulator, obtaining steelmaking steam production data and steelmaking steam consumption data;
step three: recording an upper pressure limit and a lower pressure limit of the heat accumulator and the maximum heat accumulating capacity of the heat accumulator;
step four: the flow rate of the steam delivery is controlled:
controlling the flow rate and the delivery time of the delivered steam, and controlling and maintaining the pressure of the heat accumulator;
the existing 5 converters and 3RH furnaces are respectively a steel-making converter No. 1, a steel-making converter No. 2 and a steel-making converter No. 3, and are matched with the RH furnaces No. 1 and No. 2, wherein the RH furnace No. 2 is mainly opened, and the RH furnace No. 1 is prepared for being opened; two steel-making converters No. 4 and No. 5 are matched with a No. 3RH furnace; the specific cases are as follows:
1) Case one: all converters and RH furnaces are produced simultaneously, the steam delivery regulating valve takes flow regulation as a main part, and the pressure is controlled as an auxiliary part; the flow rate of the flow regulation is set to be 44 t/hour, and the pressure of the heat accumulator cannot be lower than 2.6Mpa;
2) And a second case: all converters and RH furnaces No. 2 and No. 3 are simultaneously produced, the steam delivery regulating valve takes flow regulation as a main part, pressure control as an auxiliary part, the flow setting value of flow regulation is 75.8 t/hour, and meanwhile, the pressure of the heat accumulator cannot be lower than 2.6Mpa;
3) And a third case: all converters are simultaneously produced, the RH furnace No. 3 is produced, the first step of regulating valve is fully opened, when the steam is sent out for more than 30t, the steam flow regulating valve is automatically switched to flow regulation, the flow set value is 20 t/hour, and meanwhile, the pressure of the heat accumulator cannot be lower than 2.6Mpa;
4) Case four: 2 converters are arranged in the No. 1, the No. 2 and the No. 3 converters, the No. 4 and the No. 5 converters are arranged, all RH furnaces are simultaneously arranged, the first step of regulating valve is fully closed, when the storage pressure of the heat accumulator reaches 3.0Mpa, the steam flow regulating valve adopts flow control, the flow set value is 50 t/hour, and meanwhile, the pressure of the heat accumulator cannot be lower than 2.6Mpa;
5) Case five: 2 converters are arranged in the No. 1, the No. 2 and the No. 3 converters, the No. 4 and the No. 5 converters are arranged in the No. 2 and the No. 3RH furnaces are arranged in the No. 2 and the No. 3 converters, the steam delivery regulating valve is mainly used for regulating the flow, the pressure is controlled as an auxiliary, the flow setting value of the flow regulation is 49.2 t/hour, and meanwhile, the pressure of the heat accumulator cannot be lower than 2.6Mpa;
6) Case six: the production of 1 converter, the production of 4 converters and 5 converters, the production of 2 converters and 3RH converters are carried out, the steam delivery regulating valve is mainly based on flow regulation, the pressure control is auxiliary, the flow setting value of the flow regulation is 31.6 t/hour, and meanwhile, the pressure of the heat accumulator cannot be lower than 2.6Mpa;
7) Case seven: one of the converters 1, 2 and 3 is used for producing a converter, one of the converters 4 and 5 is used for producing a converter, and the other of the converters 2 and 3 is used for producing RH;
8) Case eight: the production of the converters 1, 2 and 3, the production of the converters 4 and 5, the production of the RH furnaces 1 and 2, the complete closing of the steam delivery regulating valve and the non-delivery of the steam;
9) Case nine: the converters 1, 2 and 3 are all produced, the converters 4 and 5 are not produced, the RH furnace 2 is produced, the steam delivery regulating valve is mainly used for regulating the flow, the pressure is controlled as an auxiliary, the flow setting value of the flow regulation is 37.8 t/hour, and meanwhile, the pressure of the heat accumulator cannot be lower than 2.6Mpa.
2. The modeling and control method of steelmaking steam balance as defined in claim 1 wherein: and recording the upper pressure limit of the heat accumulator according to the steam recovery pressure of the converter and the resistance loss of the pipeline, and recording the lower pressure limit of the heat accumulator according to the steam pressure used by an RH furnace user and the resistance loss of the pipeline.
3. The modeling and control method of steelmaking steam balance as defined in claim 1 wherein: the steelmaking steam production data comprise a steam production working period, a steam production converting time, a steam production daily treatment amount, a furnace steam production amount, an average steam production amount in continuous period hours, an average steam production amount in daily hours and a daily steam production amount; the steelmaking steam consumption data comprise a steam consumption working period, a steam consumption converting time, a steam consumption daily treatment amount, a furnace steam consumption amount, an average steam consumption amount in continuous period hours, an average steam consumption amount in daily hours and a daily steam consumption amount.
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Inventor after: Guo Haibin Inventor after: Yang Fubin Inventor after: Gong Changjun Inventor before: Qi Minghu Inventor before: Wang Guobing Inventor before: Wang Qianyun Inventor before: Sun Jifang |