CN117270583A - Steam pipe network balance optimization control method and system - Google Patents
Steam pipe network balance optimization control method and system Download PDFInfo
- Publication number
- CN117270583A CN117270583A CN202311250081.6A CN202311250081A CN117270583A CN 117270583 A CN117270583 A CN 117270583A CN 202311250081 A CN202311250081 A CN 202311250081A CN 117270583 A CN117270583 A CN 117270583A
- Authority
- CN
- China
- Prior art keywords
- steam
- converter
- pipe network
- optimization control
- steam pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005457 optimization Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 claims abstract description 78
- 238000001595 flow curve Methods 0.000 claims abstract description 30
- 229920006395 saturated elastomer Polymers 0.000 claims description 52
- 230000008859 change Effects 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 238000010248 power generation Methods 0.000 abstract description 13
- 230000004044 response Effects 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000009628 steelmaking Methods 0.000 description 29
- 229910000831 Steel Inorganic materials 0.000 description 26
- 239000010959 steel Substances 0.000 description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 24
- 238000003860 storage Methods 0.000 description 14
- 229910052742 iron Inorganic materials 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000001816 cooling Methods 0.000 description 9
- 238000007664 blowing Methods 0.000 description 8
- 238000005338 heat storage Methods 0.000 description 8
- 230000033764 rhythmic process Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 239000002918 waste heat Substances 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 6
- 238000009834 vaporization Methods 0.000 description 6
- 230000008016 vaporization Effects 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 5
- 238000004590 computer program Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000011555 saturated liquid Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a steam pipe network balance optimization control method and a steam pipe network balance optimization control system, wherein the method comprises the following steps: setting an optimization control system to communicate with the converter to acquire production state information of the converter in real time, wherein the production state information comprises a first steam flow value actually generated by converting the converter, correcting a flow curve of the converter through the first steam flow value actually generated by converting the converter, and taking a second steam flow value corresponding to the corrected flow curve as an adjustment set value of an outlet adjusting valve of the heat accumulator to realize balance optimization control of a steam pipe network. The invention not only can ensure the stable operation of all steam utilization points of the pipe network, but also can greatly improve the service life of all the steam utilization points of the whole steam pipe network system, especially the service life of the steam turbine, and can also obviously improve the economic operation level of the power generation system, and meanwhile, the invention avoids the coupling interference among all control devices, and has the advantages of higher response speed and higher adjustment precision.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a steam pipe network balance optimization control method and system.
Background
Currently, the energy flow structure of iron and steel enterprises can be divided into: energy conversion link, energy utilization link, energy recovery link. The utility energy system mainly converts external primary energy into secondary energy such as steam, electricity, water, fuel gas and the like which are required by the steel manufacturing process, so that the utility energy system is responsible for the energy supply task of the whole enterprise. The iron and steel enterprises use a large amount of steam and input power is required, so that the thermoelectric system plays an important role in the public energy system.
The steam pipe network system is used as an important system for energy conversion, utilization and recovery of iron and steel enterprises, and the safety operation level of the steam system and the economic operation level of the system can be improved obviously by intensively monitoring the steam balance condition of the steam pipe network system and the whole plant and timely adjusting managed steam and power generation equipment.
The saturated steam pipe network is one of a plurality of steam pipe networks in iron and steel enterprises, and generally belongs to a medium-low pressure steam pipe network. The main source of saturated steam is generally the vapor produced by the vaporization cooling system of the steelmaking converter, the vapor produced by the steel rolling heating furnace and other small vapor producing points. The saturated steam pipe network of the iron and steel enterprises has more absorption points, and systems such as coking, desulfurization and denitrification, a blast furnace and a converter are adopted, but the absorption point with the highest occupation ratio and adjustable is generally a saturated steam generator set.
When the pressure of the steam pipe network is too low, the steam pipe network system can be used for extracting steam from a dry quenching system, supplementing the steam after passing through a temperature and pressure reducing device, or supplementing the steam from other systems so as to maintain the pressure balance of the pipe network. When the pressure of the steam pipe network is too high, as other steam utilization points are limited by the main process system, the steam quantity cannot be regulated, the load of the saturated steam waste heat generator set is generally increased to consume redundant steam of the pipe network, and when the load of the generator set is increased to the maximum, the steam of the pipe network is required to be diffused when necessary, so that energy waste is caused.
Among the above steam sources in the pipe network, the main steam source is generally the steam produced by the vaporization cooling system of the converter and the steam produced by the steel rolling heating furnace, and the adjustable air source is the extraction steam of other systems. Wherein, the steam production of the converter vaporization cooling system is strongly related to the blowing rhythm of the converter, and the fluctuation of the steam production is large. The steam yield of the steel rolling heating furnace is stable, and the stable output of steam can be generally realized under the condition that the steel rolling system does not stop production. The adjustable air source is affected by the configuration condition of the steam system of each iron and steel enterprise, and the complete configuration and supplement cannot be realized.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a novel structure,
in order to achieve the expected effect, the invention adopts the following technical scheme:
the invention discloses a steam pipe network balance optimization control method, which comprises the following steps:
setting an optimization control system to communicate with the converter to acquire production state information of the converter in real time, wherein the production state information comprises a first steam flow value actually generated by converting the converter, correcting a flow curve of the converter through the first steam flow value actually generated by converting the converter, and taking a second steam flow value corresponding to the corrected flow curve as an adjustment set value of an outlet adjusting valve of the heat accumulator to realize balance optimization control of a steam pipe network.
Further, when a plurality of converters work simultaneously, the first steam flow values actually generated by the plurality of converters are overlapped to obtain an actually generated total steam flow value, and a preset flow curve of the converters is corrected according to the actually generated total steam flow value.
Further, the total steam flow value actually generated by the converter is obtained in real time through a main steam flow meter at the outlet of the heat accumulator.
Further, before the flow curve of the converter is corrected by the first steam flow value actually generated by converting the converter, the flow curve of the converter is calculated according to the converting curve of the converter and the steam flow characteristic curve of the converter.
Further, the method further comprises: and predicting the change value of the steam production in a preset time period according to the converting curve of the converter and the flow curve of the converter, and predicting the time point of the formation of the peak of the steam production according to the change value.
Further, the optimization control system avoids the formation of the steam production flood peak by adjusting the steam production flood peak accordingly before the formation of the steam production flood peak.
Further, the peak of the steam generation amount is the maximum value of the steam storage amount of the heat accumulator, and the maximum value of the steam storage amount of the heat accumulator is calculated according to the real-time liquid level value and the pressure value of the heat accumulator.
Further, the steam pipe network balance optimization control specifically includes: and converting the steam quantity transmitted to the steam pipe network by the converter into the steam turbine load of the saturated steam generator set of the steam pipe network by the absorption device so as to perform balance optimization control on the steam pipe network.
Further, the amount of steam delivered by the converter to the steam pipe network=the amount of steam actually generated by the converter-the maximum value of the amount of stored steam in the heat accumulator.
The invention also discloses a steam pipe network balance optimization control system, which comprises:
the acquisition module is used for acquiring production state information of the converter;
and the control module is used for carrying out steam pipe network balance optimization control according to any method.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a steam pipe network balance optimization control method and a steam pipe network balance optimization control system, which can enable the inlet steam pressure of a saturated steam power generation turbine to be always in a fluctuation state and be lifted to a level for maintaining a stable state for a long time. The invention not only can ensure the stable operation of each steam utilization point of the pipe network, but also can greatly improve the service life of all the steam utilization points of the whole steam pipe network system, especially the service life of the steam turbine, and can also obviously improve the economic operation level of the power generation system. Because the steam pipe network is often long in pipeline, the pressure change response is slow, the hysteresis is strong, the pressure regulation mode of the original control devices is changed into the steam flow regulation mode, the coupling interference among the control devices is avoided, the response speed is faster, and the regulation precision is higher.
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, it being obvious that the drawings described below are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an application schematic diagram of a steam pipe network balance optimization control method provided by an embodiment of the invention.
Fig. 2 is a schematic diagram of a converting curve of a steam pipe network balance optimization control method according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a steam pipe network balance optimization control system according to an embodiment of the present invention.
Fig. 4 is a working flow chart of a steam pipe network balance optimization control system provided by an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The saturated steam pipe network has a plurality of user points, such as a blast furnace, oxygen production, sintering, steelmaking RH, a saturated steam generator set and the like, but the main adjustable user points are the saturated steam generator set generally, and the saturated steam generator set is used for completing thermoelectric conversion, so that steam waste is avoided, and the purposes of energy conservation and consumption reduction are achieved.
The main steam source of the saturated steam pipe network is influenced by the blowing rhythm of converter steelmaking, so that the conditions of large pipe network pressure fluctuation, mismatching of steam yield and steam consumption and the like exist. When the converter blows in the peak period, the vapor yield of vaporization cooling is increased, the pressure of a saturated vapor pipe network is increased greatly, and sometimes, the vapor is diffused; when the converter blowing is finished, the steam yield of vaporization cooling is reduced, and the pressure of the saturated steam pipe network is greatly reduced. The load of the saturated steam generator set greatly fluctuates along with the pressure of the pipe network.
Referring to fig. 1 to 4, the invention discloses a steam pipe network balance optimization control method, which comprises the following steps:
setting an optimization control system to communicate with the converter to acquire production state information of the converter in real time, wherein the production state information comprises a first steam flow value actually generated by converting the converter, correcting a flow curve of the converter through the first steam flow value actually generated by converting the converter, and taking a second steam flow value corresponding to the corrected flow curve as an adjustment set value of an outlet adjusting valve of the heat accumulator to realize balance optimization control of a steam pipe network.
The importance of the steam system for safe production and energy saving and consumption reduction of steel enterprises is obvious, so that the stable saturated steam pipe network pressure is an effective means for improving the safe and stable operation level of the steam system of a steel mill, and the input of the saturated steam pipe network balance optimization control system can ensure that the inlet steam pressure of the saturated steam power generation turbine is always in a fluctuation state before input and is improved to a level for maintaining the stable state for a long time. The method can ensure the stable operation of each steam point of the pipe network, greatly improve the service life of all user points of the whole steam pipe system, particularly the steam turbine, and remarkably improve the economic operation level of the power generation system.
The invention relates to a steam pipe network balance optimization control method with a main steam source of steelmaking saturated steam, which is mainly applied to the metallurgical industry, wherein the saturated steam pipe network air source is the vapor cooling steam production of a steelmaking converter, and a pipe network comprises a steelmaking heat accumulator, 1 or more saturated steam waste heat generator sets and other steam user points. According to the invention, the load of the saturated steam waste heat generator set is synchronously regulated in real time according to the steam production rhythm change model of the steelmaking converter, so that the purpose of pressure balance of the saturated steam pipe network is achieved.
In a preferred embodiment, when a plurality of converters work simultaneously, the first steam flow values actually generated by the plurality of converters are overlapped to obtain an actually generated total steam flow value, and the preset flow curve of the converters is corrected according to the actually generated total steam flow value.
For example, as shown in fig. 1, taking a general configuration scheme of a certain iron and steel enterprise as an example, the main steam source is 8 converters for producing steam in total in two steel plants, meanwhile, 6 steel rolling heating furnaces are configured for producing steam, and when the pressure of a saturated steam pipe network is insufficient, the steam extraction of a gas generator set or the steam extraction of a dry quenching generator set can be adjusted for supplementing. The main adjustable user points are 3 saturated steam units and other fixed steam user points of the pipe network. And dynamically correcting the preset flow curve of the converter in real time in an average mode according to the total flow value actually generated.
Further, before the flow curve of the converter is corrected by the first steam flow value actually generated by converting the converter, the flow curve of the converter is calculated according to the converting curve of the converter and the steam flow characteristic curve of the converter.
Specifically, the production process of the converter is divided into iron charging, oxygen lance blowing, tapping, slag splashing protection, slag tapping and the like, and the production process is a steel production process, and the steel enters a waiting period or a next furnace production process cycle after finishing one furnace. Wherein steam is only generated when the oxygen lance is used for converting, and no steam is generated in other time periods. The whole production process of one-furnace steel is generally about 30-35 minutes (the deviation is caused according to the different time of the converter capacity, in this case 30 minutes is taken as an example), and the blowing process is 13-18 minutes (the deviation is caused according to the different time of the converter capacity, in this case 15 minutes is taken as an example). The converter produces steam not evenly but intensively in the one-time converting process. The converting curves of the converters of different capacities are shown in fig. 2.
Further, the method further comprises: and predicting the change value of the steam production in a preset time period according to the converting curve of the converter and the flow curve of the converter, and predicting the time point of the formation of the peak of the steam production according to the change value.
For example, total steam production of a single converter=steam production rate=converting time=open-blowing stage steam production+peak stage steam production+end stage steam production. Taking 200t converters as an example, the steam production of a single converter is about 60-70 t/h, but the steam production rate in 15 minutes of converting is about 140t/h. The converter production is affected by the upstream and downstream of the steelmaking process, and the blowing time is uncertain. When a plurality of converters are simultaneously converting, production flood peaks can be generated, when the production flood peaks are generated, the heat accumulator is not regulated timely, steam at the heat accumulator is diffused, the saturated steam generator set is subjected to pipe network pressure change lag, the steam is not timely consumed, and then the energy utilization rate is low and the safety risk exists.
Further, the optimization control system avoids the formation of the steam production flood peak by adjusting the steam production flood peak accordingly before the formation of the steam production flood peak.
In general, the converter steelmaking generates steam, the heat storage adjustment is carried out through the heat storage device to ensure continuous output of steam, and the heating furnace is used for continuous steam production in the steel rolling process. The generation of the vaporized cooling steam of the steelmaking converter is periodically changed along with the converter converting process, the simultaneous converting of a plurality of converters can form the alternating trend of steam production peaks and valleys, and the saturated steam generator set adjusts the load absorption pipe network steam through a steam turbine inlet valve.
Further, the peak of the steam generation amount is the maximum value of the steam storage amount of the heat accumulator, and the maximum value of the steam storage amount of the heat accumulator is calculated according to the real-time liquid level value and the pressure value of the heat accumulator.
Further, the steam pipe network balance optimization control specifically includes: and converting the steam quantity transmitted to the steam pipe network by the converter into the steam turbine load of the saturated steam generator set of the steam pipe network by the absorption device so as to perform balance optimization control on the steam pipe network.
Further, the amount of steam delivered by the converter to the steam pipe network=the amount of steam actually generated by the converter-the maximum value of the amount of stored steam in the heat accumulator.
Specifically, the heat storage capacity of the heat storage device needs to be synchronously considered while considering the amount of steam delivered to the steam pipe network by the converter. Taking a spherical heat accumulator with a converter vaporization cooling outlet 3 as an example, wherein the spherical heat accumulator takes water in a spherical tank as a heat accumulating medium, and when the steam pressure at an inlet of the heat accumulator is higher than the saturated steam pressure in an internal gas phase space, the saturated steam in a pipe network is liquefied into saturated water and stored in the heat accumulator; when the outlet pressure of the heat accumulator is lower than the saturated steam pressure of the internal gas phase space, the saturated water in the heat accumulator is vaporized into steam and enters a steam pipe network. In the running process of the spherical heat accumulator, the gas-liquid phase of the steam is changed, so that the heat exchange capacity of the steam and the water storage capacity of the heat accumulator become important indexes of the heat storage capacity of the heat accumulator. The water storage capacity of the heat accumulator is represented as the liquid level of the heat accumulator in the operation process, and is represented as the effective volume ratio in the design process, namely the ratio of the water storage volume of the heat accumulator to the actual volume of the heat accumulator.
The actual volume of the spherical heat accumulator is as follows: v (V) 0 ＝4/3πR 3
The water storage volume of the spherical heat accumulator is as follows:
the effective volume ratio of the spherical heat accumulator is as follows: epsilon=v w /V 0
Wherein R is the radius of the spherical tank, hw is the height of the water storage liquid level, and epsilon is the effective volume ratio.
The heat exchange capacity of the heat accumulator mainly depends on the operating pressure of the inlet and outlet main pipes, and is calculated through the mass balance and the energy balance of the gas-liquid two-phase crops of the heat accumulator.
Illustratively, the calculation formula is as follows:
material balance:
m vap ＝M 2 -cV w1 -d
energy balance:
c∝(1/v′ 1 -1/v″ 2 )；d∝ε
subscript w: liquid water; subscript vap: steam; superscript': saturated liquid state; superscript "saturated liquid state
By obtaining the real-time liquid level of the spherical heat accumulator and the pressure value of the heat accumulator, the steam which can be stored in the heat accumulator in real time is calculated in real time, and the steam which can be stored in the steam pipe network in real time can be obtained. For most iron and steel enterprises, the steelmaking process is not interconnected with the steam pipe network system of the iron and steel enterprises. Therefore, the outlet regulating valve of the steelmaking heat accumulator and the saturated steam inlet regulating valve are controlled by pressure, and meanwhile, the pressure of a pipe network is controlled. The pressure fluctuation of the pipe network has hysteresis relative to the steel-making production rhythm, and the coupling phenomenon exists in the process of simultaneously adjusting the pressure of the pipe network by a plurality of units and a plurality of outlet adjusting valves of the heat accumulator, so that the pressure fluctuation is extremely easy to cause.
The invention obtains the converter oxygen lance converting production state information through the optimizing control system (the optimizing control system communicates with various steelmaking equipment and energy storage equipment through Modbus protocol), and then calculates the steam generation amount and steam generation curve of each converter from the converting beginning stage according to the converting curve and the converter steam generation flow characteristic curve of each converter. Because the starting and running rhythms of each converter are different, when a plurality of converters are used for converting simultaneously, corresponding flow rates are overlapped according to the starting time of converter converting, for example, 10 points, namely 1# converter is used for converting for 3 minutes, corresponding flow rates are inquired according to flow rate curves, 2# converter is used for converting for 5 minutes, 3# converter is used for converting for 11 minutes, 4# converter is used for converting for 14 minutes, flow rate values of corresponding flow rate curves are inquired respectively, and all flow rates are overlapped. And meanwhile, predicting the change value of the steam production amount in a future period of time according to the converting curve and the steam production curve of the converter, and predicting the formation of a production flood peak.
Further, the total steam flow value actually generated by the converter is obtained in real time through a main steam flow meter at the outlet of the heat accumulator.
Illustratively, a main steam flowmeter (FT-100/FT-200) is arranged at the outlet of the steelmaking heat accumulator, and the converter is corrected according to the flow rate (acquired according to the flowmeter) of each actual converter during convertingAnd predicting the steam production amount and automatically correcting the steam flow curve of the converter. I.e. F100 sp ＝F101 sp +F102 sp +F103 sp +F104 sp ，F101 sp ～F104 sp To predict flow value, F200 sp ＝F201 sp +F202 sp +F203 sp +F204 sp ，F201 sp ～F204 sp To predict the flow value, F101 sp ～F104 sp F201 sp ～F204 sp From the steelmaking converting curve. Flowmeter F101 pv ～F104 pv F201 pv ～F204 pv The actual flow generation value of each converter is measured by the flowmeters FT-101-FT-104 and FT-201-FT-204 respectively and is used for correcting the converting flow curve of each converter. And meanwhile, according to the real-time liquid levels LT-111-LT-113 and LT-211-LT-213 of the heat accumulator, the real-time pressures PT-111-PT-113 and PT-211-PT-213 of the heat accumulator, the real-time energy-saving steam quantities F110 and F210 of the heat accumulator are calculated.
The outlet valve (FV-100/FV-200) of the steel-making heat accumulator controls the output steam energy (flow and enthalpy) of the heat accumulator to adopt a PID flow regulation mode, and the set value is F100 without pressure regulation sp /F200 sp The feedback value is the actual value F100pv/F200pv measured by the accumulator outlet flow meter FT-100/FT-200. Meanwhile, the upper limit and the lower limit of the pipe network pressure (PT-001) are used as limiting values of outlet valves of the steelmaking heat accumulator so as to ensure that the pressure deviation is within an allowable range. The steam generated by steelmaking and sent to the pipe network is F001=F100 pv +F200 pv -K 11 *F110-K 12 * F210, deducting the amount of steam that the regenerator can store, by multiplying by the corresponding coefficient k 11 And k 12 The purpose of setting the coefficient is to adjust according to the heat accumulating capacity of the heat accumulator and the diffusing capacity of the pipe network.
For the most important absorption device (waste heat generator set) in the steam pipe network, the steam energy generated instantaneously by the pipe network is converted into the steam turbine load of the saturated steam turbine set for adjustment. I.e. k 01 *F001+k 02 *F002+k 03 *F003＝k 00 * F001. Wherein k is 01 ～k 03 Generally according to the corresponding total load of the unitThe duty ratio is taken, if the total load is 100MW, the load of the No. 1 steam turbine is 25MW, the corresponding total load duty ratio of the unit is 25%, k 01 Namely, the value is 0.25, and fine adjustment can be performed on the basis according to the power generation efficiency values of different units. Because the steam generated by steelmaking is not completely consumed by the saturated steam generator set, the coefficient K is set 00 The ratio of the steam quantity consumed by the saturated steam generator set as the steam generated in steelmaking can be finely adjusted according to the actual production condition of the pipe network. The inlet gate of each saturated steam generator set adopts flow/load control according to k 01 *F001～k 03 * F003 is controlled as a set value.
As shown in fig. 3, an optimization control station is set to communicate with the 1# to 8# converters respectively, so as to obtain the production state information (iron charging, oxygen lance converting, tapping, slag splashing protecting, slag tapping and the like) of the converters, obtain the real-time pressure value and the liquid level value of the steelmaking heat accumulator, and simultaneously inquire the flow curve of the corresponding converters, and carry out curve correction according to the actually generated flow value of the corresponding converters. And taking the corrected flow value as an adjusting set value of the outlet adjusting valve FV-100/FV-200 of the heat accumulator. And meanwhile, the method is communicated with the saturated steam generator sets according to the calculation result of the model, the opening degree of the inlet valve of each set is guided, and the steam pressure balance and the steam flow consumption of the pipe network are controlled.
The invention divides the steam pipe network steam generating point into a real-time variable steam generating point and a fixed steam generating point, and divides the steam pipe network steam using point into an adjustable steam using point and an unadjustable steam using point. The difference value of steam consumption between the non-adjustable steam consumption point and the fixed steam production point is a fixed value with smaller fluctuation during normal production. The response of the steam consumption point can be adjusted in advance according to the production rhythm change of the real-time change steam consumption point and the prediction of corresponding steam flow so as to achieve the aim of basic steam balance.
As shown in fig. 4, in one embodiment of the invention, the steam generating point is 8 converters, the heat storage device is 6 billiard heat storages, and the adjustable steam generating point is 3 saturated steam waste heat generating sets. The configurations of all steel plants are different, but the corresponding control can be performed after the fine adjustment can be performed according to the formula.
The invention is applied to the metallurgical industry, the gas source of a saturated steam pipe network is the vapor cooling and vapor production of a steelmaking converter, and the pipe network comprises a steelmaking heat accumulator, 1 or more saturated steam waste heat generator sets and other steam user points. The load of the saturated steam waste heat generator set is synchronously regulated in real time according to the change model of the steam production rhythm of the steelmaking converter so as to achieve the purpose of pressure balance of the saturated steam pipe network.
The importance of the steam system for safe production and energy saving and consumption reduction of steel enterprises is obvious, and the stable saturated steam pipe network is an effective means for improving the safe and stable operation level of the steam system of the steel plant, and the input of the saturated steam pipe network balance optimization control system can ensure that the inlet steam pressure of the saturated steam power generation turbine is always in a fluctuation state before input and is improved to a level for maintaining the stable state for a long time. The method can ensure the stable operation of each steam point of the pipe network, greatly improve the service life of all user points of the whole steam pipe system, particularly the steam turbine, and remarkably improve the economic operation level of the power generation system.
Based on the same thought, the invention also discloses a steam pipe network balance optimization control system, which comprises:
the acquisition module is used for acquiring production state information of the converter;
and the control module is used for carrying out steam pipe network balance optimization control according to any method.
Embodiments of the system and embodiments of the foregoing method may be implemented in a one-to-one correspondence, and are not described herein.
The importance of the steam system for safe production and energy saving and consumption reduction of iron and steel enterprises is obvious, and the steam pressure at the inlet of the saturated steam power generation turbine is expected to be improved to a level which is maintained at xxMPa (can be determined according to the set value of actual production requirements and has a general error within +/-0.2 MPa) for a long time from the original amplitude fluctuation of more than 1.0MPa by putting the steam pipe network balance optimization control system into the steam system. The invention not only can ensure the stable operation of each steam point of the pipe network, but also can greatly improve the service life of all user points of the whole steam pipe system, especially the service life of the steam turbine, and can obviously improve the economic operation level of the power generation system. By the configuration of the steam pipe network balance optimization control system, the control of the output steam of the steelmaking heat accumulator can be optimized, and communication connection is established with the production rhythm of the steelmaking converter, so that the production flood peak is predicted, the saturated steam power generation turbine is absorbed in advance, and the steam diffusion caused by the production flood peak during blowing of a plurality of converters in steelmaking can be avoided. By configuring the steam pipe network balance optimization control system, the steam heat storage system and the saturated steam power generation system of the steelmaking converter are intensively and effectively managed and controlled, and the steam pipe network operating pressure can be stabilized and the main pipe operating pressure of the heat accumulator can be improved by means of the self-evaluation optimization model of the heat accumulator. The invention can ensure that more steam is stored in the working condition of the production flood peak (the working condition of converting simultaneously) and avoid the steam from diffusing; meanwhile, more steam can be conveyed to the steam pipe network under the working condition of low-valley production (the working condition that the converter does not blow at the same time), so that the saturated steam generator set is ensured to be in the working condition with higher economic benefit for a long time.
Based on the same thought, the invention also discloses electronic equipment, which can comprise: the device comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are in communication with each other through the communication bus. The processor may invoke logic instructions in the memory to perform a steam pipe network balance optimization control method comprising:
setting an optimization control system to communicate with the converter to acquire production state information of the converter in real time, wherein the production state information comprises a first steam flow value actually generated by converting the converter, correcting a flow curve of the converter through the first steam flow value actually generated by converting the converter, and taking a second steam flow value corresponding to the corrected flow curve as an adjustment set value of an outlet adjusting valve of the heat accumulator to realize balance optimization control of a steam pipe network.
Further, the logic instructions in the memory described above may be implemented in the form of software functional units and stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, embodiments of the present invention further provide a computer program product, where the computer program product includes a computer program stored on a non-transitory computer readable storage medium, where the computer program includes program instructions, when the program instructions are executed by a computer, enable the computer to perform a steam pipe network balance optimization control method provided by the foregoing method embodiments, where the method includes:
setting an optimization control system to communicate with the converter to acquire production state information of the converter in real time, wherein the production state information comprises a first steam flow value actually generated by converting the converter, correcting a flow curve of the converter through the first steam flow value actually generated by converting the converter, and taking a second steam flow value corresponding to the corrected flow curve as an adjustment set value of an outlet adjusting valve of the heat accumulator to realize balance optimization control of a steam pipe network.
In still another aspect, an embodiment of the present invention further provides a non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor is implemented to perform a steam pipe network balance optimization control method provided in the foregoing embodiments, including:
setting an optimization control system to communicate with the converter to acquire production state information of the converter in real time, wherein the production state information comprises a first steam flow value actually generated by converting the converter, correcting a flow curve of the converter through the first steam flow value actually generated by converting the converter, and taking a second steam flow value corresponding to the corrected flow curve as an adjustment set value of an outlet adjusting valve of the heat accumulator to realize balance optimization control of a steam pipe network.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the flowcharts of the figures may include a plurality of sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily being sequential, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. The steam pipe network balance optimization control method is characterized by comprising the following steps of:
setting an optimization control system to communicate with the converter to acquire production state information of the converter in real time, wherein the production state information comprises a first steam flow value actually generated by converting the converter, correcting a flow curve of the converter through the first steam flow value actually generated by converting the converter, and taking a second steam flow value corresponding to the corrected flow curve as an adjustment set value of an outlet adjusting valve of the heat accumulator to realize balance optimization control of a steam pipe network.
2. The steam pipe network balance optimization control method of claim 1, wherein when a plurality of converters work simultaneously, the first steam flow values actually generated by the plurality of converters are superimposed to obtain an actually generated total steam flow value, and a preset flow curve of the converters is corrected according to the actually generated total steam flow value.
3. The steam pipe network balance optimization control method according to claim 2, wherein the total steam flow value actually generated by the converter is obtained in real time through a main steam flow meter at the outlet of the heat accumulator.
4. The steam pipe network balance optimization control method of claim 1, further comprising calculating a flow curve of the converter according to a converting curve of the converter and a converter steam flow characteristic curve before correcting the flow curve of the converter by the first steam flow value actually generated by converting the converter.
5. The steam pipe network balance optimization control method of claim 4, further comprising: and predicting the change value of the steam production in a preset time period according to the converting curve of the converter and the flow curve of the converter, and predicting the time point of the formation of the peak of the steam production according to the change value.
6. The steam pipe network balance optimization control method according to claim 5, wherein the optimization control system avoids the formation of the steam production flood peak by adjusting the steam production flood peak before the steam production flood peak is formed.
7. The steam pipe network balance optimization control method according to any one of claims 5-6, wherein the steam generation amount flood peak is the maximum value of the stored steam amount of the heat accumulator, and the maximum value of the stored steam amount of the heat accumulator is calculated according to the real-time liquid level value and the pressure value of the heat accumulator.
8. The steam pipe network balance optimization control method according to claim 7, wherein the steam pipe network balance optimization control specifically comprises: and converting the steam quantity transmitted to the steam pipe network by the converter into the steam turbine load of the saturated steam generator set of the steam pipe network by the absorption device so as to perform balance optimization control on the steam pipe network.
9. The steam pipe network balance optimization control method according to claim 8, wherein the steam quantity transmitted to the steam pipe network by the converter=the steam quantity actually generated by the converter-the maximum value of the stored steam quantity of the heat accumulator is a corresponding coefficient.
10. A steam pipe network balance optimization control system, comprising:
the acquisition module is used for acquiring production state information of the converter;
a control module for performing steam pipe network balance optimization control according to any one of the methods of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311250081.6A CN117270583A (en) | 2023-09-26 | 2023-09-26 | Steam pipe network balance optimization control method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311250081.6A CN117270583A (en) | 2023-09-26 | 2023-09-26 | Steam pipe network balance optimization control method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117270583A true CN117270583A (en) | 2023-12-22 |
Family
ID=89200387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311250081.6A Pending CN117270583A (en) | 2023-09-26 | 2023-09-26 | Steam pipe network balance optimization control method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117270583A (en) |
-
2023
- 2023-09-26 CN CN202311250081.6A patent/CN117270583A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107290968B (en) | Coordination optimization control method of multi-energy complementary comprehensive energy system | |
| CN109236391B (en) | Method for calculating peak regulation range of cogeneration unit | |
| CN106089338B (en) | A kind of back pressure machine association system and method adjusting heat supply and power generation | |
| CN110070460A (en) | More set gas-steam combined cycle set thermoelectricity Optimal Load Dispatching Systems | |
| CN110676847A (en) | Optimal scheduling method considering wind power-heat storage unit-electric boiler combined operation | |
| CN108683200B (en) | Method for participating in primary frequency modulation of power grid through compressed air energy storage | |
| CN109373347B (en) | Coal supply quantity optimization control method for unit bypass heat supply | |
| CN111478376A (en) | Thermal power generating unit coordinated control peak shaving frequency modulation system and method | |
| CN103580063A (en) | Large-scale grid-connected wind power consumption method based on demander response | |
| CN110829408B (en) | Multi-domain scheduling method considering energy storage power system based on power generation cost constraint | |
| CN111706411A (en) | Thermodynamic system for transforming back pressure unit into extraction condensing unit and working method | |
| CN111255529B (en) | Rapid response automatic power generation control system and method during operation of heat supply cylinder cutting unit | |
| CN106050341B (en) | A kind of data center's integration power supply device to be freezed using pipe network natural gas power | |
| CN111206970B (en) | Peak regulating system utilizing steam jet and steam extractor in thermal power plant and control method | |
| CN208024416U (en) | Steam control equipment | |
| CN112964492B (en) | Heat supply coal consumption online measuring method suitable for high-backpressure step heat supply unit | |
| CN113405088A (en) | Three-impulse frequency conversion automatic adjusting method | |
| CN117270583A (en) | Steam pipe network balance optimization control method and system | |
| CN107831656A (en) | A kind of fired power generating unit coordinated control system energy saving optimizing technology | |
| CN114963298B (en) | Online quantitative calculation method and system for energy storage of steam pipe network | |
| CN114837757B (en) | High-water-adding bypass frequency modulation system of thermal power plant provided with steam ejector and working method | |
| CN210087400U (en) | Gas-steam combined cycle power plant shaft seal steam supply system | |
| CN113419459A (en) | Thermal power generating unit CCS-TF control method based on energy storage system | |
| CN113819070B (en) | Variable-frequency optimization energy-saving method and system for condensate pump of steam turbine unit | |
| CN117239782A (en) | Power peak regulation method of thermal power generating unit based on pipe network heat storage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |