CN114562718B - Optimal control method and device for cogeneration unit and storage medium - Google Patents

Optimal control method and device for cogeneration unit and storage medium Download PDF

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CN114562718B
CN114562718B CN202210097263.3A CN202210097263A CN114562718B CN 114562718 B CN114562718 B CN 114562718B CN 202210097263 A CN202210097263 A CN 202210097263A CN 114562718 B CN114562718 B CN 114562718B
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steam supply
unit
optimized
industrial steam
supply flow
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CN114562718A (en
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邓佳
许朋江
居文平
马汀山
程东涛
吕凯
薛朝囡
石慧
王妍
林轶
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Energy Saving Technology Co Ltd
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Energy Saving Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00—Control systems for steam boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/14—Combined heat and power generation [CHP]
    • 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
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Feedback Control In General (AREA)

Abstract

The invention discloses an optimal control method, device and storage medium of a cogeneration unit, wherein the method comprises the following steps: determining any two units to be optimized and other adjusting units according to the quantity of the cogeneration units; according to the total steam supply flow, adjusting the industrial steam supply flow of the unit, determining the industrial steam supply flow of the unit to be optimized, and obtaining various distribution modes; calculating to obtain corresponding industrial steam supply critical economic flow according to the output power of a generator terminal of the unit to be optimized; determining the industrial steam supply flow rate of the unit to be optimized according to the relation between the industrial steam supply flow rate and the industrial steam supply critical economic flow rate of the unit to be optimized; and comparing the heat economy according to each distribution mode to obtain the industrial steam supply flow of each unit. By implementing the invention, the heat load of industrial steam supply among all units of the power plant can be reasonably planned, the running economy of the power plant can be optimized, and the overall running economy, refinement and automation level of the power plant can be provided.

Description

Optimal control method and device for cogeneration unit and storage medium
Technical Field
The invention relates to the technical field of power station boilers and turbine systems, in particular to an optimal control method and device for a cogeneration unit and a storage medium.
Background
Along with the continuous adjustment and optimization of the electric power industry structure in China, the expansion of the operation income of the thermal power plant by singly relying on power generation is limited to a certain extent, and many power plants start to develop industrial steam supply to realize the cogeneration. The energy utilization rate of the thermal power plant is only about 40%, and the thermal power plant is an advanced energy utilization mode for generating electricity and heat, so that the energy is saved, the thermal power plant can replace small boilers for scattered heat supply to improve the environmental quality, and the thermal efficiency is generally above 45%.
The cold section reheat steam extraction and the hot section reheat steam extraction (hereinafter referred to as cold and hot re-extraction) are common and important industrial steam supply modes, and the economy of unit operation is closely related to the rationality of extraction parameters. In order to formulate an economic and reasonable industrial steam supply modification scheme, related scholars respectively research different schemes for supplying industrial steam such as a heat pump, a back pressure turbine exhaust, a temperature and pressure reducer, a pressure matcher and the like, and the method has certain reference significance for heat supply modification of the same type of units. To further improve the economy of operation of the cogeneration unit, the scholars respectively reduce the secondary heat exchangersResearch is conducted on the aspects of loss, improvement of waste heat utilization of exhaust steam, reduction of throttling loss of extraction steam and the like, and improvement schemes of series-parallel coupling absorption heat pump, novel multi-heat source cascade heat supply for optimizing back pressure, addition of back pressure machine and the like are provided, and comprehensive energy efficiency and economical efficiency of the optimized system are improved.
In order to optimize the micro-grid coordinated scheduling of the combined heat and power system and reduce the running cost of the micro-grid, related scholars respectively conduct researches on aspects of performance evaluation, comprehensive energy system economic scheduling and the like of the micro-grid through Monte Carlo experiment comparison, improvement of chaotic particle swarm optimization algorithm, hierarchical optimization scheduling, weak robust optimization and the like. However, in actual production, the selection of the positions of some industrial steam extraction points is unreasonable, the energy consumption of a unit is increased due to the fact that industrial steam supply is caused, the thermal economy of the unit operation is poor, the statistical coal consumption and the calculation coal consumption are seriously inconsistent, and the coal deficiency is caused in the production of a power plant, so that the management is dilemma. Under certain working conditions, the industrial steam supply cascade utilization can properly increase the steam discharge pressure of a high-pressure cylinder to meet the steam use requirement of industrial users, but energy loss is increased, if the forward action of energy consumption reduction caused by the industrial steam extraction cascade utilization cannot balance the energy loss, the cascade utilization is likely to cause the energy consumption of the unit to be increased, and for a power plant with multiple units for industrial steam supply at the same time, unreasonable distribution of industrial steam supply load among the units can cause the energy consumption of the unit to be increased.
Disclosure of Invention
In view of the above, the embodiment of the invention provides an optimal control method, an optimal control device and a storage medium for a cogeneration unit, so as to solve the technical problem that the distribution of industrial steam supply among the units is unreasonable in the prior art.
The technical scheme provided by the invention is as follows:
an embodiment of the present invention provides an optimization control method for a cogeneration unit, including: determining any two units to be optimized and other adjusting units according to the quantity of the cogeneration units; adjusting the industrial steam supply flow of the adjusting unit according to the total steam supply flow, and determining the industrial steam supply flow of the unit to be optimized to obtain various distribution modes; calculating to obtain industrial steam supply critical economic flow corresponding to the load of the unit to be optimized according to the output power of the generator terminal of the unit to be optimized in each distribution mode; determining the industrial steam supply flow rate of the unit to be optimized according to the relation between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate; and (3) comparing the heat economy according to the industrial steam supply flow of the adjusting unit in each distribution mode and the industrial steam supply flow optimized by the corresponding unit to be optimized to obtain the industrial steam supply flow of each unit.
Optionally, determining the industrial steam supply flow rate after the unit to be optimized according to the relationship between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate includes: when the industrial steam supply flow of the unit to be optimized is greater than or equal to the corresponding industrial steam supply critical economic flow, judging whether the difference value between the industrial steam supply flow and the unit steam supply flow of the unit to be optimized is greater than or equal to the corresponding industrial steam supply critical economic flow; when the flow rate is greater than or equal to the preset value, reducing the industrial steam supply flow rate of the corresponding unit according to the unit steam supply flow rate, increasing the industrial steam supply flow rate of another unit to be optimized, and judging whether the heat economy after flow rate optimization is greater than the heat economy before optimization; and when the energy consumption is not greater than the energy consumption, continuously optimizing the industrial steam supply flow of the unit steam supply flow to be optimized and judging the heat economy until the optimized heat economy is greater than the heat economy before the optimization, so as to obtain the industrial steam supply flow of the unit to be optimized.
Optionally, determining the industrial steam supply flow rate after the unit to be optimized according to the relationship between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate, and further includes: when the industrial steam supply flow of the unit to be optimized is smaller than the corresponding industrial steam supply critical economic flow, judging the relation between the industrial steam supply flow of the unit to be optimized and the difference value of the corresponding industrial steam supply critical economic flow; and adjusting the industrial steam supply flow of the unit to be optimized with a larger difference value to 0, adding the industrial steam supply flow of the unit to be optimized with a smaller difference value and the industrial steam supply flow of the unit to be optimized with a larger difference value to obtain the industrial steam supply flow after the unit to be optimized is optimized.
Optionally, determining the industrial steam supply flow rate after the unit to be optimized according to the relationship between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate, and further includes: when the industrial steam supply flow of the two units to be optimized is respectively more than or equal to and less than the corresponding industrial steam supply critical economic flow, judging the relation between the industrial steam supply flow of the units to be optimized and the difference value of the corresponding industrial steam supply critical economic flow; judging whether the corresponding unit with smaller difference value is a unit to be optimized which is smaller than the corresponding industrial steam supply critical economic flow; when the industrial steam supply critical economic flow is smaller than the corresponding industrial steam supply critical economic flow, the industrial steam supply flows of the two units to be optimized are adjusted according to the smaller difference value; optimizing the industrial steam supply flow adjusted by the two units to be optimized according to the unit steam supply flow, and judging whether the economical efficiency after flow optimization is greater than the economical efficiency before optimization; and when the economic value is not greater than the economic value, continuing to optimize the industrial steam supply flow of the unit to be optimized according to the unit steam supply flow, and judging the economic value until the economic value after optimization is greater than the economic value before optimization, so as to obtain the industrial steam supply flow after optimization of the unit to be optimized.
Optionally, determining the industrial steam supply flow rate after the unit to be optimized according to the relationship between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate, and further includes: when the corresponding industrial steam supply critical economic flow with smaller difference is the unit to be optimized, the industrial steam supply flow of the unit to be optimized with larger difference is adjusted to 0, and the industrial steam supply flow of the unit to be optimized with smaller difference and the industrial steam supply flow of the unit to be optimized with larger difference are added to obtain the industrial steam supply flow after the unit to be optimized is optimized.
Optionally, calculating to obtain the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized according to the output power of the generator terminal of the unit to be optimized in each distribution mode, including: determining heat consumption of the pure condensing working condition unit and heat consumption of the industrial steam supply working condition unit according to the output power of the generator terminal of the unit to be optimized; and calculating according to the heat consumption of the pure condensing working condition unit and the heat consumption of the industrial steam supply working condition unit to obtain the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized.
Optionally, adjusting the industrial steam supply flow of the adjusting unit according to the total steam supply flow, determining the industrial steam supply flow of the unit to be optimized, and obtaining multiple distribution modes, including: sequentially adjusting the industrial steam supply flow of each unit in the adjusting unit according to the total steam supply flow; and determining the industrial steam supply flow of a group of units to be optimized according to the difference value of the industrial steam supply flow and the total steam supply flow of the adjusting unit after each adjustment.
A second aspect of the embodiment of the present invention provides an optimization control device for a cogeneration unit, including: the optimizing unit determining module is used for determining any two units to be optimized and other adjusting units according to the number of the cogeneration units; the flow determining module is used for adjusting the industrial steam supply flow of the adjusting unit according to the total steam supply flow, determining the industrial steam supply flow of the unit to be optimized and obtaining various distribution modes; the critical flow determining module is used for calculating and obtaining industrial steam supply critical economic flow corresponding to the load of the unit to be optimized according to the output power of the generator terminal of the unit to be optimized in each distribution mode; the optimizing module is used for determining the industrial steam supply flow rate after the unit to be optimized is optimized according to the relationship between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate; and the comparison module is used for comparing the heat economy according to the industrial steam supply flow of the adjusting unit in each distribution mode and the industrial steam supply flow of the corresponding unit to be optimized after optimization, so as to obtain the industrial steam supply flow of each unit.
A third aspect of the embodiment of the present invention provides a computer readable storage medium, where computer instructions are stored, where the computer instructions are configured to cause the computer to execute the optimal control method of the cogeneration unit according to any one of the first aspect and the first aspect of the embodiment of the present invention.
A fourth aspect of an embodiment of the present invention provides an electronic device, including: the system comprises a memory and a processor, wherein the memory and the processor are in communication connection, the memory stores computer instructions, and the processor executes the computer instructions so as to execute the optimal control method of the cogeneration unit according to the first aspect and any one of the first aspect of the embodiment of the invention.
The technical scheme provided by the invention has the following effects:
according to the optimal control method, the optimal control device and the storage medium for the cogeneration unit, the unit to be optimized and the adjustment unit are determined based on the number of the cogeneration units, the industrial steam supply flow of the unit to be optimized is determined according to the industrial steam supply flow of the adjustment unit, the industrial steam supply flow of the unit to be optimized is optimized in a mode of comparing with the industrial steam supply critical economic flow, multiple distribution modes are obtained, then the thermal economy of the multiple distribution modes is judged, and finally the optimal distribution mode is obtained. Therefore, through the optimization control method, the heat load of industrial steam supply among all units of the power plant can be reasonably planned, the running economy of the power plant can be optimized, and the overall running economy, refinement and automation level of the power plant can be provided.
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 needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of optimizing control of a cogeneration unit according to an embodiment of the invention;
FIG. 2 is a flow chart of a method of optimizing control of a cogeneration unit according to another embodiment of the invention;
FIG. 3 is a schematic diagram of an energy consumption critical characteristic curve of a unit under different working conditions at an industrial extraction pressure of 3.0MPa according to an embodiment of the invention;
FIG. 4 is a block diagram of an optimal control apparatus of a cogeneration unit according to an embodiment of the invention;
FIG. 5 is a schematic diagram of a computer-readable storage medium provided according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
The terms first, second, third, fourth and the like in the description and in the claims and in the above drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to an embodiment of the present invention, there is provided an optimal control method of a cogeneration unit, it being noted that the steps shown in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical sequence is shown in the flowchart, in some cases the steps shown or described may be performed in a different order than here.
In this embodiment, an optimal control method of a cogeneration unit is provided, which may be used for electronic devices, such as a computer, a mobile phone, a tablet pc, etc., fig. 1 is a flowchart of the optimal control method of the cogeneration unit according to an embodiment of the present invention, and as shown in fig. 1, the method includes the following steps:
the embodiment of the invention provides an optimal control method of a cogeneration unit, as shown in fig. 1, comprising the following steps:
step S101: and determining any two units to be optimized and other adjusting units according to the quantity of the cogeneration units. Specifically, the optimization control method is suitable for a power plant which adopts two or more than two units for industrial steam supply. When two units supply industrial steam, the two units are used as units to be optimized. When more than two units supply industrial steam, two units are selected from the units at will as units to be optimized, and the rest units are used as adjusting units.
Step S102: and adjusting the industrial steam supply flow of the adjusting unit according to the total steam supply flow, and determining the industrial steam supply flow of the unit to be optimized to obtain various distribution modes. Specifically, when the power plant needs to supply industrial steam, the total steam supply flow of the required steam is constant, so that the industrial steam supply flow of the unit can be determined and adjusted based on the total steam supply flow, and the industrial steam supply flows of the two units to be optimized are obtained. The industrial steam supply flow of each unit in the adjusting unit is sequentially adjusted according to the total steam supply flow; and determining the industrial steam supply flow of a group of units to be optimized according to the difference value of the industrial steam supply flow and the total steam supply flow of the adjusting unit after each adjustment.
For example, as shown in fig. 2, when the cogeneration unit includes three units, two of the units are selected as units to be optimized, and one unit is left as an adjustment unit. And then, the industrial steam supply flow of the adjusting unit is adjusted from 0, when the industrial steam supply flow of the adjusting unit is 0, the steam supply flows of the two units to be optimized are the total steam supply flows, and then the total steam supply flows are evenly distributed to each unit to be optimized, so that the industrial steam supply flow of the unit to be optimized is obtained. An allocation is thus determined.
And then adjusting the steam supply flow of the adjusting unit, in order to enable the final result to be more accurate, adjusting by taking the unit steam supply flow as a reference, namely increasing the unit steam supply flow by the steam supply flow of the adjusting unit each time, and taking the average value of the difference value of the total steam supply flow and the steam supply flow of the adjusting unit as the steam supply flow of the unit to be optimized.
And continuously adjusting the steam supply flow of the adjusting unit, and calculating the steam supply flow of the unit to be optimized by adopting the mode until the determined industrial steam supply flow of the unit to be optimized is 0 when the steam supply flow of the adjusting unit is the total steam supply flow. Therefore, by adjusting the industrial steam supply flow of the adjusting unit, various distribution modes of the industrial steam supply flow can be obtained.
When the cogeneration unit comprises four units, two of the units are selected as units to be optimized, and the remaining two units are used as adjusting units. When the flow rates of the two adjusting units are adjusted, the flow rate of one adjusting unit is fixed, for example, the flow rate of the other adjusting unit and the flow rate of the unit to be optimized are adjusted according to the mode after the flow rate of the one adjusting unit is fixed to be 0. And then increasing the flow of the fixed adjusting unit by the unit steam supply flow, and adjusting according to the mode. Thus, the flow of the fixed adjustment unit is sequentially adjusted until the flow of the fixed adjustment unit is fixed to be the total steam supply flow.
When the cogeneration unit comprises more than four units, the flow of one adjustment unit can be continuously adjusted in the mode, and the flow of the remaining adjustment units is fixed, so that all adjustment units can traverse all flow combinations. Thus, by the above manner, various distribution manners can be obtained.
Step S103: and calculating to obtain the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized according to the output power of the generator terminal of the unit to be optimized in each distribution mode. When the flow optimization is carried out on the units to be optimized, the industrial steam supply critical economic flow of the two units to be optimized is calculated. The industrial steam supply critical economic flow is a flow when the heat consumption of the industrial steam supply working condition is equal to that of the pure condensation working condition, and therefore, the flow calculating step comprises the following steps: determining heat consumption of the pure condensing working condition unit and heat consumption of the industrial steam supply working condition unit according to the output power of the generator terminal of the unit to be optimized; and calculating according to the heat consumption of the pure condensing working condition unit and the heat consumption of the industrial steam supply working condition unit to obtain the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized.
Specifically, the heat consumption of the pure condensing condition unit is calculated by the following formula:
wherein r is cn The heat consumption of the unit under the pure condensation condition is expressed as kJ/(kW.h); y represents the output power of a generator terminal of the unit, and the unit is kW; q (Q) cn The boiler heat absorption capacity of the medium under the pure condensation condition is shown as kJ/h.
The heat consumption of the industrial steam supply working condition unit is calculated by the following formula:
wherein r is gy Represents the heat consumption of the industrial steam supply working condition of the unit, the unit is kJ/(kW.h), Q gy The unit of the boiler heat absorption capacity representing the medium of the industrial steam supply working condition is kJ/h; h1 represents the enthalpy value of industrial extraction, and the unit is kJ/kg; h2 represents the enthalpy value of industrial backwater, and the unit is kJ/kg; x represents the industrial steam extraction flow of the industrial steam extraction working condition of the unit, and the unit is kg/h.
The industrial steam supply critical economic flow is the flow when the heat consumption of the industrial steam supply working condition is equal to that of the pure condensation working condition. When the industrial steam supply critical economic flow is calculated, the two formulas are combined, and the calculation formula of the industrial steam supply critical economic flow can be obtained as follows:
step S104: and determining the industrial steam supply flow rate of the unit to be optimized according to the relation between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate.
Specifically, the industrial steam supply critical economic flow Xc of the unit is a key parameter related to the heat economy of the cogeneration unit, and when the industrial steam supply flow X of the industrial steam supply working condition unit is larger than the critical industrial steam supply economic flow Xc under the electric load under the same output power of a generator terminal of the unit, the industrial steam supply is beneficial to reducing the energy consumption level of the unit and improving the heat economy of the unit; when the industrial steam supply flow X of the industrial steam supply working condition unit is equal to the critical industrial steam supply economic flow Xc under the electric load, the heat consumption of the industrial steam supply working condition unit is equal to the heat consumption of the pure condensation working condition unit, and the industrial steam supply does not contribute to improving the heat economy of the unit; when the industrial steam supply flow X is smaller than the critical industrial steam supply economic flow Xc under the electric load, the heat consumption of the industrial steam supply working condition unit is larger than that of the pure condensation working condition unit, the industrial steam supply does not contribute to improving the heat economy of the unit, and the industrial steam supply can cause the increase of the whole coal consumption level of the unit and the heat economy of the unit to be poor.
Therefore, the industrial steam supply flow of the unit to be optimized can be optimized by comparing the industrial steam supply flow of the unit to be optimized with the corresponding industrial steam supply critical economic flow, and the optimized industrial steam supply flow can be obtained.
Step S105: and (3) comparing the heat economy according to the industrial steam supply flow of the adjusting unit in each distribution mode and the industrial steam supply flow optimized by the corresponding unit to be optimized to obtain the industrial steam supply flow of each unit. According to the above step S102, when determining the industrial steam supply flow of the unit to be optimized, the steam supply flow of the corresponding adjusting unit is adjusted, so that various distribution modes can be obtained. The industrial steam supply flow of each group of units to be optimized can be optimized to obtain optimized industrial steam supply flow, and then the economical efficiency of the industrial steam supply flow of each group of units to be optimized after being optimized and the economical efficiency of the industrial steam supply flow distribution of the unit to be optimized are calculated to obtain the distribution result with the optimal economical efficiency. And then determining the industrial steam supply flow of each unit according to the distribution result.
Specifically, when the economy judgment is performed, the heat consumption of the unit is calculated according to the flow of the unit under each distribution condition and the output power of the corresponding generator terminal, and then the heat economy calculation is performed according to the heat consumption and the output power of the generator terminal. For example, the cogeneration unit includes three units. The final determined flow rates of the three units are X1, X2 and X3 respectively, the output power of the generator terminals of the three units are Y1, Y2 and Y3 respectively, the heat consumption of each unit is R1, R2 and R3 respectively, and the thermal economy of the three units obtained through calculation is expressed as R1×Y1+R2×Y2+R3×Y3. After a plurality of distribution modes are calculated, each distribution mode is calculated by adopting the mode to obtain corresponding heat economy for comparison, and the distribution mode with the largest heat economy is selected as the optimal distribution result.
According to the optimal control method of the cogeneration unit, the unit to be optimized and the adjustment unit are determined based on the number of the cogeneration units, the industrial steam supply flow of the unit to be optimized is determined according to the industrial steam supply flow of the adjustment unit, the industrial steam supply flow of the unit to be optimized is optimized in a mode of comparing with the industrial steam supply critical economic flow, multiple distribution modes are obtained, then the thermal economy of the multiple distribution modes is judged, and finally the optimal distribution mode is obtained. Therefore, through the optimization control method, the heat load of industrial steam supply among all units of the power plant can be reasonably planned, the running economy of the power plant can be optimized, and the overall running economy, refinement and automation level of the power plant can be provided.
In one embodiment, determining the optimized industrial steam supply flow of the unit to be optimized according to the relationship between the industrial steam supply flow of the unit to be optimized and the corresponding industrial steam supply critical economic flow includes the following steps:
step S201: when the industrial steam supply flow of the unit to be optimized is larger than or equal to the corresponding industrial steam supply critical economic flow, judging whether the difference value between the industrial steam supply flow and the unit steam supply flow of the unit to be optimized is larger than or equal to the corresponding industrial steam supply critical economic flow. The industrial steam supply flow of the two units to be optimized is respectively represented as X1 and X2,1 represents a unit No. 1, 2 represents a unit No. 2, the industrial steam supply critical economic flow of the two units to be optimized is respectively represented as Xc1 and Xc2, the unit steam supply flow is represented by 1, and the unit steam supply flow is a minimum distribution unit of steam supply, can be determined based on actual conditions, and can be 1 ton or 0.1 ton, for example. When X1 is more than or equal to Xc1 and X2 is more than or equal to Xc2, judging whether X1-1 is more than or equal to Xc1, if X1-1 is more than or equal to Xc1, performing next increase and decrease calculation, if X1-1 is less than Xc1, judging that X2-1 is more than or equal to Xc2, if X2-1 is less than Xc2, performing next increase and decrease calculation, and if X2-1 is less than Xc2, maintaining the current state without optimization.
Step S202: and when the flow rate is greater than or equal to the preset value, reducing the industrial steam supply flow rate of the corresponding unit according to the unit steam supply flow rate, increasing the industrial steam supply flow rate of another unit to be optimized, and judging whether the heat economy after flow rate optimization is greater than the heat economy before optimization. When X1-1 is larger than or equal to Xc1, the industrial steam supply flow of the two units to be optimized after flow optimization is expressed as X1 '=X 1-1, X2' =X2+1, the heat economy before and after optimization is calculated according to formulas R1×Y1+R2×Y2 and R1 '×Y1+R2' ×Y2, R1 and R2 respectively represent the heat consumption of the two units to be optimized before optimization, Y1 and Y2 respectively represent the output power of generator terminals of the two units to be optimized before and after optimization, and the heat consumption of the two units to be optimized after optimization is expressed as R1 'and R2'. In addition, when X2-1 is larger than or equal to Xc2, corresponding calculation is also performed, at this time, the industrial steam supply flow of the two units to be optimized after flow optimization is represented as X1 '=x1+1, and X2' =x2-1, and then the calculation of the heat economy is performed in the same manner, which is not repeated here.
Step S203: and when the energy consumption is not greater than the energy consumption, continuously optimizing the industrial steam supply flow of the unit steam supply flow to be optimized and judging the heat economy until the optimized heat economy is greater than the heat economy before the optimization, so as to obtain the industrial steam supply flow of the unit to be optimized. When R1 'xY1+R2' xY 2 is not more than R1 xY1+R2 xY 2, continuing to calculate X1 '-1 and X2' -1, judging the heat economy before and after the optimization according to the formula, and if the heat economy after the optimization is more than the heat economy before the optimization, taking the optimized flow as the flow after the optimization of the unit to be optimized at the moment.
Step S204: and when the industrial steam supply flow of the unit to be optimized is smaller than the corresponding industrial steam supply critical economic flow, judging the relation between the industrial steam supply flow of the unit to be optimized and the difference value of the corresponding industrial steam supply critical economic flow. Specifically, if it is judged that X1 < Xc1 and X2 < Xc2 are determined, Δx1=xc1-X1, Δx2=xc2-X2 is calculated, and Δx1 and Δx2 sizes are judged.
Step S205: and adjusting the industrial steam supply flow of the unit to be optimized with a larger difference value to 0, adding the industrial steam supply flow of the unit to be optimized with a smaller difference value and the industrial steam supply flow of the unit to be optimized with a larger difference value to obtain the industrial steam supply flow after the unit to be optimized is optimized. Specifically, when Δx1 is greater than or equal to Δx2, the industrial steam supply flow rate after optimization of the two units to be optimized is respectively represented as 0 (No. 1 unit) and x2+x1 (No. 2 unit); when DeltaX 1 is less than DeltaX 2, the optimized industrial steam supply flow of the two units to be optimized is respectively expressed as X1+ X2 (No. 1 unit) and 0 (No. 2 unit).
Step S206: when the industrial steam supply flow of the two units to be optimized is respectively more than or equal to and less than the corresponding industrial steam supply critical economic flow, judging the relation between the industrial steam supply flow of the units to be optimized and the difference value of the corresponding industrial steam supply critical economic flow; specifically, if it is judged that X1 is greater than or equal to Xc1 and X2 is less than Xc2, Δx1=x1-xc1, Δx2=xc2-x2 is calculated; if X1 is less than Xc1 and X2 is more than or equal to Xc2, calculating delta X1 = Xc1-X1 and delta X2 = X2-Xc2; the magnitudes of Δx1 and Δx2 in each case are then determined.
Step S207: and judging whether the corresponding unit with smaller difference is a unit to be optimized which is smaller than the corresponding industrial steam supply critical economic flow. Specifically, if X1 is greater than or equal to Xc1 and X2 is less than Xc2, and ΔX1 is greater than or equal to ΔX1; or, X1 is less than Xc1, X2 is more than or equal to Xc2, and DeltaX2 is more than or equal to DeltaX 1, and the two are judged to correspond.
Step S208: and when the industrial steam supply critical economic flow is smaller than the corresponding industrial steam supply critical economic flow, adjusting the industrial steam supply flows of the two units to be optimized according to the smaller difference value. Specifically, if the above condition is satisfied, the flow rate adjustment is performed according to the smaller difference Δx1 or Δx2. For example, if the above condition is satisfied and the difference is small, the adjusted flow rates are x1 '=x1+Δx1, x2' =x2- Δx1, respectively; if the above conditions are satisfied and the difference is smaller for the No. 2 unit, the adjusted flow rates are X1 '=x1- Δx2, x2' =x2+Δx2, respectively.
Step S209: and optimizing the industrial steam supply flow after the adjustment of the two units to be optimized according to the unit steam supply flow, and judging whether the economical efficiency after flow optimization is greater than the economical efficiency before optimization. Specifically, when the difference is the unit No. 1, it is determined that x2″ =x2 ' -1 is not less than Xc2, if yes, flow optimization is performed by the formulas x1″ =x1 ' +1 and x2″ =x2 ' -1, and the economic judgment before and after optimization is performed by the formula (r1×y1+r2×y2)/(y1+y2). When the difference is smaller as the No. 2 unit, judging that X1 '= X1' -1 is not less than Xc1, if yes, the flow optimization is performed by the formulas x1# =x1# -1 and x2# =x2# +1, the economic judgment before and after optimization is carried out by adopting a formula (R1×Y1+R2×Y2)/(Y1+Y2).
Step S210: and when the economic value is not greater than the economic value, continuing to optimize the industrial steam supply flow of the unit to be optimized according to the unit steam supply flow, and judging the economic value until the economic value after optimization is greater than the economic value before optimization, so as to obtain the industrial steam supply flow after optimization of the unit to be optimized. When (R1% -Y1+R2% -Y1+Y2)/(Y1+Y2) is not more than (R1×Y1+R2×Y2)/(Y1+Y2), continuing to optimize, judging the economy before and after optimizing according to the formula, and if the economy after optimizing is more than the economy before optimizing, taking the optimized flow as the flow after optimizing the unit to be optimized at the moment.
Step S211: when the corresponding industrial steam supply critical economic flow with smaller difference is the unit to be optimized, the industrial steam supply flow of the unit to be optimized with larger difference is adjusted to 0, and the industrial steam supply flow of the unit to be optimized with smaller difference and the industrial steam supply flow of the unit to be optimized with larger difference are added to obtain the industrial steam supply flow after the unit to be optimized is optimized. Specifically, if X1 is greater than or equal to Xc1 and X2 is less than Xc2, and meanwhile DeltaX2 is greater than or equal to DeltaX 1, the industrial steam supply flow after optimization of the two units to be optimized is respectively expressed as X1+ X2 (unit No. 1) and 0 (unit No. 2); if X1 is less than Xc1 and X2 is more than or equal to Xc2, and meanwhile, delta X1 is more than or equal to delta X2, and when delta X1 is less than delta X2, the industrial steam supply flow after optimization of the two units to be optimized is respectively represented as 0 (No. 1 unit) and X2+X1 (No. 2 unit).
In one embodiment, the power plant has two 310 MW-level units, the industrial steam supply source is cold re-extraction steam, and the industrial steam supply pressure is 3.0MPa. The current electric load and the heat load of the two units are 124MW of the No. 1 unit electric load, 54/h of industrial steam supply, 186MW of the No. 2 unit electric load and 54t/h of industrial steam supply. The two units are directly used as units to be optimized, and no unit is adjusted.
The heat consumption of the unit is 8593 kJ/(kW.h) when the electric load of the unit No. 1 is 124MW and the industrial steam supply flow is 54t/h. No. 2 unit electric load 186MW, industrial steam supply is 54t/h, and heat consumption of the unit is 8182 kJ/(kW.h).
The calculation shows that when the industrial steam extraction pressure is 3MPa, the critical economic flow rate is 68t/h when the unit electric load is 124MW, and the critical economic flow rate is 38t/h when the unit electric load is 186 MW.
When the mode is adopted for optimization control, the method specifically comprises the following steps:
step 301: initial parameters (54 t/h,124 MW) were entered (54 t/h,186 MW).
Step 302: xc1=68t/h, xc2=38t/h.
Step 303: judging that X1=54 t/h < Xc1=68 t/h and X2=54 t/h is larger than or equal to Xc2=38 t/h, calculating delta X1=Xc1-X1=68-54=14 t/h and delta X2=X 2-Xc2=54-38=16 t/h.
Step 304: if the determination that Δx2=16t/h is equal to or greater than Δx1=14t/h, the calculation is performed by x1 '=x1+Δx1=54+14=68t/h, and x2' =x2- Δx1=54-14=40t/h.
Step 305: if the judgment determines that X2' -1=40-1=39 t/h is larger than or equal to Xc2=38 t/h, calculating X1 "=X1 ' +1=68+1=69 t/h, and X2" =X2 ' -1=40-1=39 t/h.
Step 306: calculating (r1″ xy1+r2 "×y2)/(y1+y2) = (8492×124+8247×186)/(124+186) =8345 kJ/(kw·h); (r1×y1+r2×y2)/(y1+y2) = (8502×124+8243×186)/(124+186) =8347 kJ/(kw·h), the economy after optimization is smaller than the economy before optimization.
Step 307: and judging again to determine that X2' -1=39-1=38t/h is larger than or equal to Xc2=38t/h, and calculating to obtain the optimized flow rates of 70t/h and 38t/h respectively.
Step 308: and judging the economy again according to the formula, and calculating to obtain the optimized economy as 8343 kJ/(kW.h) and the pre-optimized economy as 8345 kJ/(kW.h), wherein the optimized economy is smaller than the pre-optimized economy.
Step 309: again, if the determination is that x2' "-1=38-1=37 t/h < xc2=38 t/h, the current state is maintained.
Therefore, the optimal distribution of the industrial steam supply flow of the unit can be calculated through the formula, wherein the steam supply flow of the No. 1 unit is X1=70 t/h, the steam supply flow of the No. 2 unit is X2=38 t/h, the steam consumption requirement of industrial users is met, and meanwhile, the economical efficiency of the unit operation is guaranteed under the condition of safe operation of the unit.
When the above-described manner is adopted for the optimization control, the economic indicators before and after the control are shown in the following table 1:
TABLE 1
Content of the item Unit (B) Original economic index of power plant Economic index after optimizing control method
Electric load of No. 1 unit MW 124 124
Industrial steam supply quantity of No. 1 unit t/h 54 70
Heat consumption of No. 1 machine set kJ/(kW·h) 8593 8482
Electric load of No. 2 machine set MW 186 186
Industrial steam supply of No. 2 machine set t/h 54 38
Heat consumption of No. 2 machine set kJ/(kW·h) 8182 8251
Average equivalent heat consumption of power plant kJ/(kW·h) 8346 8343
As can be seen from Table 1, the original No. 1 unit has 124MW of electric load, 54t/h of industrial steam supply and 8593 kJ/(kW.h) of heat consumption; the original No. 2 unit has 186MW electric load, 54t/h industrial steam supply and 8182 kJ/(kW.h) heat consumption; the equivalent average heat consumption of the power plant was 8346 kJ/(kW.h). The economic index of the power plant is optimized by adopting the optimization control method.
Because the electric load is directly scheduled by the power grid, the electric load distribution is kept unchanged, the industrial steam supply of the No. 1 unit is adjusted to 70t/h from 54t/h, the industrial steam supply of the No. 2 unit is adjusted to 38t/h from 54t/h, and the equivalent average heat consumption of the power plant is reduced from 8346 kJ/(kW.h) to 8343 kJ/(kW.h), and 3 kJ/(kW.h) is reduced.
Specifically, the critical economic flow rates of different working conditions of the unit are connected by curves, namely the energy consumption critical characteristic curve of the unit. FIG. 3 is a graph showing the critical characteristic of energy consumption of the unit under different working conditions at an industrial extraction pressure of 3.0 MPa. Tables 1-29 below are data of operation and calculation of the unit under different electronegative and different thermal load conditions at 3.0MPa industrial extraction pressure. The THA (turbi ne heat-accept) working condition is a turbine heat consumption guarantee working condition.
TABLE 1 Medium parameters and economic indicators of the Unit under THA working conditions at 3.0MPa extraction pressure and different industrial extraction flows
Project Unit (B) THA THA-1t/h THA-2t/h THA-5t/h THA-8t/h THA-10t/h
Load of MW 310.0 310.0 310.0 310.0 310.0 310.0
Main steam pressure MPa 16.7 16.7 16.7 16.7 16.7 16.7
Main flow rate of steam kg/h 941184 942056 942929 945546 948161 949903
Enthalpy of main steam kJ/kg 3397 3397 3397 3397 3397 3397
Steam inlet pressure of medium pressure cylinder MPa 3.33 3.33 3.33 3.32 3.32 3.31
Pressure of extraction of steam MPa 3.60 3.60 3.59 3.59 3.58 3.58
Flow rate of extraction of steam kg/h 0 1000 2000 5000 8000 10000
Enthalpy of extraction kJ/kg 3031 3031 3031 3030 3029 3029
Flow rate of industrial steam extraction t/h 0 1 2 5 8 10
Heat consumption of machine set kJ/(kW·h) 7892 7888 7885 7875 7865 7859
Front-rear pressure difference of middle regulating door MPa 0.00 0.00 0.00 0.00 0.00 0.00
TABLE 2 Medium parameters and economic indicators of the units under different industrial extraction flows of THA working conditions under extraction pressure of 3.0MPa
Project Unit (B) THA-15t/h THA-20t/h THA-30t/h THA-40t/h THA-50t/h
Load of MW 310.0 310.0 310.0 310.0 310.0
Main steam pressure MPa 16.7 16.7 16.7 16.7 16.7
Main flow rate of steam kg/h 954256 958605 967288 975951 984602
Enthalpy of main steam kJ/kg 3397 3397 3397 3397 3397
Steam inlet pressure of medium pressure cylinder MPa 3.30 3.30 3.28 3.26 3.25
Pressure of extraction of steam MPa 3.57 3.56 3.55 3.53 3.51
Flow rate of extraction of steam kg/h 15000 20000 30000 40000 50000
Enthalpy of extraction kJ/kg 3027 3026 3023 3021 3018
Flow rate of industrial steam extraction t/h 954256 958605 967288 975951 984602
Heat consumption of machine set kJ/(kW·h) 1218 1218 1219 1219 1220
Front-rear pressure difference of middle regulating door MPa 772972 771183 767582 763951 760293
TABLE 3 Medium parameters and economic indicators of the Unit under different industrial steam extraction flows of THA working conditions under 3.0MPa steam extraction pressure
TABLE 4 Medium parameters and economic indicators of the unit under 75% THA working conditions at 3.0MPa extraction pressure and different industrial extraction flows
Table 5 partial statistics and calculated heat consumption for the unit under 75% tha conditions at 3.0mpa extraction pressure and at different extraction flows
Table 6 partial statistics and calculated heat consumption for the unit under different extraction flows for 75% tha conditions at 3.0mpa extraction pressure
Table 7.0 mpa partial statistics and calculated heat consumption for the unit under 75% tha conditions at different extraction flows at extraction pressure
Table 8 partial statistics of the unit under 60% THA conditions at different extraction flows and calculated Heat consumption
Table 9 partial statistics of the unit under 60% THA working conditions at different extraction flows and calculated heat consumption
Table 10 partial statistics of the unit under 60% THA working conditions at different extraction flows and calculated heat consumption
Table 11 partial statistics of the unit under 60% THA conditions at different extraction flows and calculated heat consumption
Table 12 partial statistics of the unit under 60% THA conditions at different extraction flows and calculated heat consumption
Table 13 partial statistics and calculated heat consumption of the unit under 60% tha conditions at different extraction flows
Table 14 partial statistics of the unit under 50% tha conditions at different extraction flows and calculated heat consumption
Table 15 partial statistics of the unit under 50% tha conditions at different extraction flows and calculated heat consumption
Table 16 partial statistics of the unit under 50% THA working conditions at different extraction flows and calculated heat consumption
Table 17 partial statistics of the unit under 50% tha conditions at different extraction flows and calculated heat consumption
Table 18 partial statistics of the unit under 50% tha conditions at different extraction flows and calculated heat consumption
Table 19 partial statistics of the unit under 50% tha conditions at different extraction flows and calculated heat consumption
Project Unit (B) 50％THA-260t/h 50％THA-280t/h 50％THA-300t/h
Load of MW 155.0 155.0 155.0
Main steam pressure MPa 16.7 16.7 16.7
Main flow rate of steam kg/h 757224 776394 795608
Enthalpy of main steam kJ/kg 3397 3397 3397
Steam inlet pressure of medium pressure cylinder MPa 1.44 1.41 1.38
Pressure of extraction of steam MPa 3.00 3.00 3.00
Flow rate of extraction of steam kg/h 260000 280000 300000
Enthalpy of extraction kJ/kg 3047 3042 3037
Flow rate of industrial steam extraction t/h 260 280 300
Heat consumption of machine set kJ/(kW·h) 7159 7036 6913
Front-rear pressure difference of middle regulating door MPa 1.33 1.36 1.40
Table 20 partial statistics data and calculated heat consumption of unit under 40% THA working condition and different steam extraction flow
Table 21 partial statistics of the unit under 40% THA conditions at different extraction flows and calculated heat consumption
Table 22 partial statistics of the unit under 40% THA working conditions at different extraction flows and calculated heat consumption
Table 23 partial statistics of the unit under 40% THA working conditions at different extraction flows and calculated heat consumption
Table 24 partial statistics data and calculated heat consumption of unit under different steam extraction flow under 40% THA working condition
Table 25 partial statistics of unit under different steam extraction flows of 30% THA working condition and calculated heat consumption
Table 26 partial statistics of unit under different steam extraction flows under 30% THA working condition and calculated heat consumption
Table 27 partial statistics of the unit under different steam extraction flows under 30% THA working conditions and calculated heat consumption
Table 28 partial statistics of unit under different steam extraction flows of 30% THA working condition and calculated heat consumption
Table 29 partial statistics of the unit under different steam extraction flows under 30% THA working conditions and calculated heat consumption
Project Unit (B) 30％THA-225t/h 30％THA-250t/h 30％THA-275t/h 30％THA-300t/h
Load of MW 93.0 93.0 93.0 93.0
Main steam pressure MPa 13.5 14.2 14.9 15.7
Main flow rate of steam kg/h 551376 576728 602436 630090
Enthalpy of main steam kJ/kg 3432 3425 3417 3408
Steam inlet pressure of medium pressure cylinder MPa 0.88 0.84 0.80 0.75
Pressure of extraction of steam MPa 3.00 3.00 3.00 3.00
Flow rate of extraction of steam kg/h 225000 250000 275000 300000
Enthalpy of extraction kJ/kg 3137 3122 3108 3093
Flow rate of industrial steam extraction t/h 225 250 275 300
Heat consumption of machine set kJ/(kW·h) 7409 7185 6966 6779
Front-rear pressure difference of middle regulating door MPa 1.90 1.93 1.97 2.02
The embodiment of the invention also provides an optimal control device of the cogeneration unit, as shown in fig. 4, the device comprises:
the optimizing unit determining module is used for determining any two units to be optimized and other adjusting units according to the number of the cogeneration units; the specific content refers to the corresponding parts of the above method embodiments, and will not be described herein.
The flow determining module is used for adjusting the industrial steam supply flow of the adjusting unit according to the total steam supply flow, determining the industrial steam supply flow of the unit to be optimized and obtaining various distribution modes; the specific content refers to the corresponding parts of the above method embodiments, and will not be described herein.
The critical flow determining module is used for calculating and obtaining industrial steam supply critical economic flow corresponding to the load of the unit to be optimized according to the output power of the generator terminal of the unit to be optimized in each distribution mode; the specific content refers to the corresponding parts of the above method embodiments, and will not be described herein.
The optimizing module is used for determining the industrial steam supply flow rate after the unit to be optimized is optimized according to the relationship between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate; the specific content refers to the corresponding parts of the above method embodiments, and will not be described herein.
And the comparison module is used for comparing the heat economy according to the industrial steam supply flow of the adjusting unit in each distribution mode and the industrial steam supply flow of the corresponding unit to be optimized after optimization, so as to obtain the industrial steam supply flow of each unit. The specific content refers to the corresponding parts of the above method embodiments, and will not be described herein.
According to the optimal control device for the cogeneration unit, provided by the embodiment of the invention, the unit to be optimized and the adjustment unit are determined based on the quantity of the cogeneration units, the industrial steam supply flow of the unit to be optimized is determined according to the industrial steam supply flow of the adjustment unit, the industrial steam supply flow of the unit to be optimized is optimized in a mode of comparing with the industrial steam supply critical economic flow, so that multiple distribution modes are obtained, then the thermal economy of the multiple distribution modes is judged, and finally the optimal distribution mode is obtained. Therefore, through the optimization control device, the heat load of industrial steam supply among all units of the power plant can be reasonably planned, the running economy of the power plant can be optimized, and the overall running economy, refinement and automation level of the power plant can be provided.
The function description of the optimal control device of the cogeneration unit provided by the embodiment of the invention is described in detail by referring to the optimal control method of the cogeneration unit in the embodiment.
The embodiment of the present invention further provides a storage medium, as shown in fig. 5, on which a computer program 601 is stored, and the instructions, when executed by a processor, implement the steps of the method for optimizing control of a thermoelectric cogeneration unit in the above embodiment. The storage medium also stores audio and video stream data, characteristic frame data, interactive request signaling, encrypted data, preset data size and the like. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a Flash Memory (Flash Memory), a Hard Disk (HDD), or a Solid State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above.
It will be appreciated by those skilled in the art that implementing all or part of the above-described embodiment method may be implemented by a computer program to instruct related hardware, where the program may be stored in a computer readable storage medium, and the program may include the above-described embodiment method when executed. Wherein the storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a random access Memory (RandomAccessMemory, RAM), a Flash Memory (Flash Memory), a Hard Disk (HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
The embodiment of the present invention further provides an electronic device, as shown in fig. 6, which may include a processor 51 and a memory 52, where the processor 51 and the memory 52 may be connected by a bus or other means, and in fig. 6, the connection is exemplified by a bus.
The processor 51 may be a central processing unit (Central Processing Unit, CPU). The processor 51 may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 52 serves as a non-transitory computer readable storage medium that may be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as corresponding program instructions/modules in embodiments of the present invention. The processor 51 executes various functional applications of the processor and data processing by running non-transitory software programs, instructions and modules stored in the memory 52, i.e., implements the optimal control method of the cogeneration unit in the above-described method embodiment.
The memory 52 may include a memory program area that may store an operating device, an application program required for at least one function, and a memory data area; the storage data area may store data created by the processor 51, etc. In addition, memory 52 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 52 may optionally include memory located remotely from processor 51, which may be connected to processor 51 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 52, which when executed by the processor 51, performs the method of optimizing control of a cogeneration unit in the embodiment shown in fig. 1-3.
The specific details of the electronic device may be understood in reference to the corresponding related descriptions and effects in the embodiments shown in fig. 1 to 3, which are not repeated herein.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.

Claims (6)

1. An optimal control method of a cogeneration unit is characterized by comprising the following steps:
determining any two units to be optimized and other adjusting units according to the quantity of the cogeneration units;
adjusting the industrial steam supply flow of the adjusting unit according to the total steam supply flow, and determining the industrial steam supply flow of the unit to be optimized to obtain various distribution modes;
calculating to obtain industrial steam supply critical economic flow corresponding to the load of the unit to be optimized according to the output power of the generator terminal of the unit to be optimized in each distribution mode;
determining the industrial steam supply flow rate of the unit to be optimized according to the relation between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate;
according to the industrial steam supply flow of the adjusting unit in each distribution mode and the industrial steam supply flow optimized by the corresponding unit to be optimized, carrying out heat economy comparison to obtain the industrial steam supply flow of each unit;
determining the industrial steam supply flow rate of the unit to be optimized according to the relation between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate, wherein the method comprises the following steps:
when the industrial steam supply flow of the unit to be optimized is greater than or equal to the corresponding industrial steam supply critical economic flow, judging whether the difference value between the industrial steam supply flow and the unit steam supply flow of the unit to be optimized is greater than or equal to the corresponding industrial steam supply critical economic flow;
When the flow rate is greater than or equal to the preset value, reducing the industrial steam supply flow rate of the corresponding unit according to the unit steam supply flow rate, increasing the industrial steam supply flow rate of another unit to be optimized, and judging whether the heat economy after flow rate optimization is greater than the heat economy before optimization;
when the energy consumption is not greater than the energy consumption, continuously optimizing the industrial steam supply flow of the unit steam supply flow to be optimized and judging the heat economy until the optimized heat economy is greater than the heat economy before the optimization, so as to obtain the industrial steam supply flow of the unit to be optimized;
when the industrial steam supply flow of the unit to be optimized is smaller than the corresponding industrial steam supply critical economic flow, judging the relation between the industrial steam supply flow of the unit to be optimized and the difference value of the corresponding industrial steam supply critical economic flow;
adjusting the industrial steam supply flow of the unit to be optimized with a larger difference value to 0, adding the industrial steam supply flow of the unit to be optimized with a smaller difference value and the industrial steam supply flow of the unit to be optimized with a larger difference value to obtain the industrial steam supply flow after the unit to be optimized is optimized;
when the industrial steam supply flow of the two units to be optimized is respectively more than or equal to and less than the corresponding industrial steam supply critical economic flow, judging the relation between the industrial steam supply flow of the units to be optimized and the difference value of the corresponding industrial steam supply critical economic flow;
Judging whether the corresponding unit with smaller difference value is a unit to be optimized which is smaller than the corresponding industrial steam supply critical economic flow;
when the industrial steam supply critical economic flow is smaller than the corresponding industrial steam supply critical economic flow, the industrial steam supply flows of the two units to be optimized are adjusted according to the smaller difference value;
optimizing the industrial steam supply flow adjusted by the two units to be optimized according to the unit steam supply flow, and judging whether the economical efficiency after flow optimization is greater than the economical efficiency before optimization;
when the economic value is not greater than the economic value, continuing to optimize the industrial steam supply flow of the unit to be optimized according to the unit steam supply flow, and judging the economic value until the economic value after optimization is greater than the economic value before optimization, so as to obtain the industrial steam supply flow after optimization of the unit to be optimized;
when the corresponding industrial steam supply critical economic flow with smaller difference is the unit to be optimized, the industrial steam supply flow of the unit to be optimized with larger difference is adjusted to 0, and the industrial steam supply flow of the unit to be optimized with smaller difference and the industrial steam supply flow of the unit to be optimized with larger difference are added to obtain the industrial steam supply flow after the unit to be optimized is optimized.
2. The optimal control method of a cogeneration unit according to claim 1, wherein the calculating the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized according to the output power of the generator terminal of the unit to be optimized in each distribution mode comprises:
Determining heat consumption of the pure condensing working condition unit and heat consumption of the industrial steam supply working condition unit according to the output power of the generator terminal of the unit to be optimized;
and calculating according to the heat consumption of the pure condensing working condition unit and the heat consumption of the industrial steam supply working condition unit to obtain the industrial steam supply critical economic flow corresponding to the load of the unit to be optimized.
3. The optimal control method of a cogeneration unit according to claim 1, wherein the adjusting industrial steam supply flow of the adjusting unit according to the total steam supply flow, determining the industrial steam supply flow of the unit to be optimized, and obtaining a plurality of distribution modes, comprises:
sequentially adjusting the industrial steam supply flow of each unit in the adjusting unit according to the total steam supply flow;
and determining the industrial steam supply flow of a group of units to be optimized according to the difference value of the industrial steam supply flow and the total steam supply flow of the adjusting unit after each adjustment.
4. An optimal control device of a cogeneration unit is characterized by comprising:
the optimizing unit determining module is used for determining any two units to be optimized and other adjusting units according to the number of the cogeneration units;
the flow determining module is used for adjusting the industrial steam supply flow of the adjusting unit according to the total steam supply flow, determining the industrial steam supply flow of the unit to be optimized and obtaining various distribution modes;
The critical flow determining module is used for calculating and obtaining industrial steam supply critical economic flow corresponding to the load of the unit to be optimized according to the output power of the generator terminal of the unit to be optimized in each distribution mode;
the optimizing module is used for determining the industrial steam supply flow rate after the unit to be optimized is optimized according to the relationship between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate;
the comparison module is used for comparing the thermal economy of the industrial steam supply flow of the unit and the industrial steam supply flow of the unit to be optimized according to the adjustment of each distribution mode, so as to obtain the industrial steam supply flow of each unit;
determining the industrial steam supply flow rate of the unit to be optimized according to the relation between the industrial steam supply flow rate of the unit to be optimized and the corresponding industrial steam supply critical economic flow rate, wherein the method comprises the following steps:
when the industrial steam supply flow of the unit to be optimized is greater than or equal to the corresponding industrial steam supply critical economic flow, judging whether the difference value between the industrial steam supply flow and the unit steam supply flow of the unit to be optimized is greater than or equal to the corresponding industrial steam supply critical economic flow;
when the flow rate is greater than or equal to the preset value, reducing the industrial steam supply flow rate of the corresponding unit according to the unit steam supply flow rate, increasing the industrial steam supply flow rate of another unit to be optimized, and judging whether the heat economy after flow rate optimization is greater than the heat economy before optimization;
When the energy consumption is not greater than the energy consumption, continuously optimizing the industrial steam supply flow of the unit steam supply flow to be optimized and judging the heat economy until the optimized heat economy is greater than the heat economy before the optimization, so as to obtain the industrial steam supply flow of the unit to be optimized;
when the industrial steam supply flow of the unit to be optimized is smaller than the corresponding industrial steam supply critical economic flow, judging the relation between the industrial steam supply flow of the unit to be optimized and the difference value of the corresponding industrial steam supply critical economic flow;
adjusting the industrial steam supply flow of the unit to be optimized with a larger difference value to 0, adding the industrial steam supply flow of the unit to be optimized with a smaller difference value and the industrial steam supply flow of the unit to be optimized with a larger difference value to obtain the industrial steam supply flow after the unit to be optimized is optimized;
when the industrial steam supply flow of the two units to be optimized is respectively more than or equal to and less than the corresponding industrial steam supply critical economic flow, judging the relation between the industrial steam supply flow of the units to be optimized and the difference value of the corresponding industrial steam supply critical economic flow;
judging whether the corresponding unit with smaller difference value is a unit to be optimized which is smaller than the corresponding industrial steam supply critical economic flow;
when the industrial steam supply critical economic flow is smaller than the corresponding industrial steam supply critical economic flow, the industrial steam supply flows of the two units to be optimized are adjusted according to the smaller difference value;
Optimizing the industrial steam supply flow adjusted by the two units to be optimized according to the unit steam supply flow, and judging whether the economical efficiency after flow optimization is greater than the economical efficiency before optimization;
when the economic value is not greater than the economic value, continuing to optimize the industrial steam supply flow of the unit to be optimized according to the unit steam supply flow, and judging the economic value until the economic value after optimization is greater than the economic value before optimization, so as to obtain the industrial steam supply flow after optimization of the unit to be optimized;
when the corresponding industrial steam supply critical economic flow with smaller difference is the unit to be optimized, the industrial steam supply flow of the unit to be optimized with larger difference is adjusted to 0, and the industrial steam supply flow of the unit to be optimized with smaller difference and the industrial steam supply flow of the unit to be optimized with larger difference are added to obtain the industrial steam supply flow after the unit to be optimized is optimized.
5. A computer-readable storage medium storing computer instructions for causing the computer to execute the optimal control method of the cogeneration unit according to any one of claims 1 to 3.
6. An electronic device, comprising: a memory and a processor, the memory and the processor are in communication connection, the memory stores computer instructions, and the processor executes the computer instructions, thereby executing the optimal control method of the cogeneration unit according to any one of claims 1-3.
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