CN111598401B - Method and device for determining operation strategy of cogeneration system with heat storage - Google Patents

Method and device for determining operation strategy of cogeneration system with heat storage Download PDF

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CN111598401B
CN111598401B CN202010314064.4A CN202010314064A CN111598401B CN 111598401 B CN111598401 B CN 111598401B CN 202010314064 A CN202010314064 A CN 202010314064A CN 111598401 B CN111598401 B CN 111598401B
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张钧泰
乔支昆
张国柱
文钰
谷小兵
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Datang Environment Industry Group Co Ltd
Datang Beijing Energy Management Co Ltd
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Datang Beijing Energy Management Co Ltd
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Abstract

The invention discloses a method and a device for determining an operation strategy of a cogeneration system with heat storage, wherein the method comprises the following steps: dividing the time intervals of the electric load of the whole day according to the daily electric load time curve, and calculating the maximum heat supply power of the steam turbine in each time interval; calculating the maximum heat storable amount or the required compensation heat amount corresponding to each time period according to the given heat load and the maximum heat supply power of the steam turbine at each time period; and determining whether the time intervals in which heat storage and heat storage are required according to the positive and negative values of the heat value required to be compensated, wherein the heat value required to be compensated is positive when the steam turbine in the time interval corresponding to the heat value required to be compensated cannot meet the heat supply requirement, and is negative otherwise.

Description

Method and device for determining operation strategy of cogeneration system with heat storage
Technical Field
The invention relates to the technical field of cogeneration, in particular to a method and a device for determining an operation strategy of a cogeneration system with heat storage.
Background
In the prior art, the traditional cogeneration unit operates according to a thermoelectric coupling mode of 'fixing power with heat', so that the peak regulation capacity of a power system is insufficient, wind and light are abandoned seriously in individual areas, and the thermoelectric decoupling transformation of the cogeneration unit is trending.
At present, a plurality of thermoelectric decoupling technologies appear, wherein the heat storage technology is widely used as a means for effectively solving the thermoelectric coupling of a cogeneration unit, the energy utilization rate can be effectively improved, renewable energy sources are consumed, and the method is also an effective means for deeply excavating the peak regulation capacity of the cogeneration unit. Different operation strategies have different influences on the energy consumption of the unit.
At present, during heating in winter, the problem of abandoned wind caused by wind-heat conflict in the three north areas of China is more and more serious, the fundamental reason is that the traditional cogeneration units are limited by the characteristics of the traditional cogeneration units, the peak regulation capacity of the system is reduced due to the operation of the thermoelectric coupling mode of 'fixing power with heat', so that the space of the wind power on the internet is insufficient, and heat storage is widely applied to the cogeneration units as a means for effectively solving the thermoelectric coupling problem of the cogeneration units. However, different operating strategies of the thermal storage tank have a large impact on the energy consumption of the whole system. Therefore, how to select an operation strategy to save energy and reduce energy consumption is an urgent problem to be solved.
Disclosure of Invention
The invention aims to provide a method and a device for determining an operation strategy of a cogeneration system with heat storage, and aims to solve the problems in the prior art.
The invention provides a method for determining an operation strategy of a cogeneration system with heat storage, which comprises the following steps:
dividing the time intervals of the electric load of the whole day according to the daily electric load time curve, and calculating the maximum heat supply power of the steam turbine in each time interval;
calculating the maximum heat storable amount or the required compensation heat amount corresponding to each time period according to the given heat load and the maximum heat supply power of the steam turbine at each time period;
and determining whether the time intervals in which heat storage and heat storage are required according to the positive and negative values of the heat value required to be compensated, wherein the heat value required to be compensated is positive when the steam turbine in the time interval corresponding to the heat value required to be compensated cannot meet the heat supply requirement, and is negative otherwise.
The embodiment of the invention also provides a device for determining the operation strategy of the cogeneration system with heat storage, which comprises:
the dividing module is used for dividing the time intervals of the electric loads of all days according to the daily electric load time curve;
the calculation module is used for calculating the maximum heat supply power of the steam turbine in each time period; calculating the maximum heat storable amount or the required compensation heat amount corresponding to each time period according to the given heat load and the maximum heat supply power of the steam turbine at each time period;
and the determining module is used for determining whether a time interval in which heat storage and heat storage are required according to the positive and negative of the heat value required to be compensated, wherein the heat value required to be compensated is positive when the steam turbine in the time interval corresponding to the heat value required to be compensated cannot meet the heat supply requirement, and is negative otherwise.
The embodiment of the invention also provides a device for determining the operation strategy of the cogeneration system with heat storage, which comprises: the device comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the computer program realizes the steps of the method for determining the operation strategy of the heat-charged cogeneration system when being executed by the processor.
The embodiment of the invention also provides a computer-readable storage medium, wherein an implementation program for information transmission is stored on the computer-readable storage medium, and when the program is executed by a processor, the steps of the method for determining the operation strategy of the cogeneration system with heat storage are implemented.
By adopting the embodiment of the invention, under the condition of given heat load, a better operation working condition can be selected for the heat-carrying heat and power cogeneration system, so that the efficiency is highest and the energy consumption is minimum when the heat and power cogeneration system operates under the working condition.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method of determining an operating strategy for a cogeneration system with heat storage in accordance with an embodiment of the present invention;
FIG. 2 is a detailed flow chart of a method for determining an operating strategy of a cogeneration system with heat storage according to an embodiment of the invention;
FIG. 3 is a schematic diagram of an operation strategy determination device of a cogeneration system with heat storage according to a first embodiment of the device of the invention;
fig. 4 is a schematic diagram of an operation strategy determination device of a cogeneration system with heat storage according to a second embodiment of the apparatus of the invention.
Detailed Description
The embodiment of the invention provides a method and a device for determining a heat-power cogeneration operation strategy with heat storage. For a given heat load and assuming that the heat load remains constant throughout the day, the heat storage is varied according to the heat storage conditions
Figure RE-GDA0002592695940000031
The time interval of heat storage and release is selected according to the efficiency, a selection basis of an operation strategy of the cogeneration with heat storage under different conditions is provided, and the method has great significance for flexible and energy-saving operation of the unit.
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Method embodiment
According to an embodiment of the present invention, a method for determining an operation strategy of a cogeneration system with heat storage is provided, fig. 1 is a flowchart of the method for determining the operation strategy of the cogeneration system with heat storage according to the embodiment of the present invention, as shown in fig. 1, the method for determining the operation strategy of the cogeneration system with heat storage according to the embodiment of the present invention specifically includes:
step 101, dividing the time intervals of the electric load of the whole day according to a daily electric load time curve, and calculating the maximum heat supply power of a steam turbine in each time interval; step 101 specifically includes the following processing:
the electric load of the whole day is simplified into a peak period, a waist load period and a valley period according to a daily electric load time curve, and the average electric load of the three periods is expressed as formula 1:
Figure RE-GDA0002592695940000041
wherein, PL,p、PL,m、PL,vRespectively representing the average electric load of a peak time period, a waist load time period and a valley time period;
calculating the maximum heat supply power Q of the steam turbine in the peak period, the waist load period and the valley periodG,p、QG,mAnd QG,v。
102, calculating the maximum storable heat or the required compensation heat corresponding to each time interval according to the given heat load and the maximum heat supply power of the steam turbine at each time interval; step 102 specifically includes the following processing:
according to a given thermal load QhMaximum heating power QG,p、QG,mAnd QG,vThe maximum storable heat Q in the peak period is calculated according to the formula 2 to 4X,pMaximum storable heat Q in the waist load periodX,mAnd the amount of heat Q required for off-peak periodsB,v:
QX,p＝QG,p-QhFormula 2;
QX,m＝QG,m-Qhformula 3;
QB,v＝Qh-QG,vequation 4.
And 103, determining whether time intervals needing heat storage and heat storage are needed according to the positive and negative values of the heat value to be compensated, wherein the heat value to be compensated is positive when the steam turbine in the time interval corresponding to the heat value to be compensated cannot meet the heat supply requirement, and is negative otherwise.
Step 103 specifically includes the following processing:
when Q isG,v≤QhAnd QB,vAnd when the load is more than or equal to 0, determining that the electric load can not meet the requirement of the heat load in the valley time period, storing heat in the peak or waist load time period, and releasing heat in the valley time period.
When Q isG,v＞QhAnd QB,vWhen the peak time interval, the waist load time interval and the valley time interval are less than 0, the unit can meet the requirement of heat load, and heat is not stored at the moment.
Specifically, when Q isG,v≤QhAnd QB,vWhen the content is more than or equal to 0, the treatment is carried out according to the following conditions:
respectively calculating heat accumulation Q in the peak time period and the waist load time period according to a formula 5B,vOf both
Figure RE-GDA0002592695940000052
Efficiency etap、ηm:
Figure RE-GDA0002592695940000051
Wherein E isP、EQ、EMCarried separately for power generation
Figure RE-GDA0002592695940000061
Carried for heat supply
Figure RE-GDA0002592695940000062
And chemistry into the unit
Figure RE-GDA0002592695940000063
When Q isX,p≥QB,v,QX,m≥QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QX,p-QB,v(ii) a If etap＜ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QX,m-QB,v；
When Q isX,m＜QB,v,QX,p≥QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QX,p-QB,v(ii) a If etap＜ηmThen choose to store heat Q in the waist load periodX,mPeak period heat accumulation QB,v-QX,mHeat release at the time of trough QB,v；
When Q isX,m≥QB,v,QX,p＜QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QB,v-QX,p(ii) a If etap＜ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QX,m-QB,v；
When Q isX,m＜QB,v,QX,p＜QB,vWhen, if QX,p+QX,m≥QB,vAnd ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QB,v-QX,p(ii) a If QX,p+QX,m≥QB,vAnd ηp＜ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QB,v-QX,p(ii) a If QX,p+QX,m＜QB,vThen choose to store heat Q in the waist load periodX,mOff-peak heat release QX,p+QX,mPeak period heat accumulation QX,pAn auxiliary heat source is required at this time.
The above technical solutions of the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Fig. 2 is a detailed flowchart of the method for determining the operation strategy of the cogeneration system with heat storage according to the embodiment of the invention. As shown in fig. 2:
the embodiment of the invention provides a method for determining an operation strategy of a heat storage tank with a heat storage thermoelectric decoupling system. By dividing the electrical load into different levels, heat storage according to different periods of time
Figure RE-GDA0002592695940000064
The efficiency level is selected to select different operating strategies of the heat storage tank.
In the practical application of the method, the material is,
Figure RE-GDA0002592695940000065
efficiency describes how well the system can be, and how well it can be, and the electrical load on the system
Figure RE-GDA0002592695940000066
The efficiency has a great influence, and the selection of the heat storage period and the heat release period of the heat storage tank is not separated from the electric load. Therefore, the embodiment of the invention calculates each time interval according to the electric load of different time intervalsOf heat storage
Figure RE-GDA0002592695940000077
Efficiency, utilization of
Figure RE-GDA0002592695940000072
The operation strategy of the heat storage tank is selected according to the efficiency.
According to the embodiment of the invention, the electric load of the whole day is simplified into three time intervals according to the daily electric load time curve: calculating the maximum heat supply power of the steam turbine in the peak time period, the waist load time period and the valley time period, wherein the maximum heat supply power is QG,p、QG,m、QG,vCalculating the maximum storable heat Q in the peak periodX,pMaximum storable heat Q in the waist load periodX,mAnd the amount of heat Q required for off-peak periodsB,vWhen the steam turbine can not meet the heat supply requirement in the valley period, QB,vPositive, otherwise negative, which can be expressed as:
QX,p＝QG,p-Qh；
QX,m＝QG,m-Qh；
QB,v＝Qh-QG,v；
in an embodiment of the invention, according to QB,vThe sizes need not have different operating strategies.
When Q isG,v≤QhWhen is, QB,vAnd more than or equal to 0, namely the electric load can not meet the requirement of the heat load in the valley period, heat storage is required in the peak or waist load period, and heat release is carried out in the valley period to meet the requirement of the heat load. Respectively calculating heat accumulation Q in the peak time period and the waist load time period according to the following formulaB,vOf both
Figure RE-GDA0002592695940000073
Efficiency etap、ηm：
Figure RE-GDA0002592695940000071
Wherein E isP、EQ、EMCarried separately for power generation
Figure RE-GDA0002592695940000074
Carried for heat supply
Figure RE-GDA0002592695940000075
And chemistry into the unit
Figure RE-GDA0002592695940000076
The first condition is as follows: when Q isX,p≥QB,v,QX,m≥QB,vThe method comprises the following steps:
(1) if etap≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QX,p-QB,v；
(2) If etap＜ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QX,m-QB,v；
Case two: when Q isX,m＜QB,v,QX,p≥QB,vThe method comprises the following steps:
(1) if etap≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QX,p-QB,v
(2) If etap＜ηmThen choose to store heat Q in the waist load periodX,mPeak period heat accumulation QB, v-QX, m, valley time heat release QB, v
Case three: when Q isX,m≥QB,v,QX,p＜QB,vThe method comprises the following steps:
(1) if etap≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QB,v-QX,p
(2) If etap＜ηmThen choose to store heat Q in the waist load periodX,mIn low ebb periodThermal QB,vPeak time exotherm QX,m-QB,v
Case four: when Q isX,m＜QB,v,QX,p＜QB,vThe method comprises the following steps:
if QX,p+QX,m≥QB,v：
(1) If etap≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QB,v-QX,p
(2) If etap＜ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QB,v-QX,p
If QX,p+QX,m＜QB,vThen choose to store heat Q in the waist load periodX,mOff-peak heat release QX,p+QX,mPeak period heat accumulation QX,pAn auxiliary heat source is required at this time.
Case five: when Q isG,v＞QhWhen is, QB,vAnd (3) less than 0, at the time of peak time period, waist load time period and valley time period, the unit can meet the requirement of heat load, and heat is not stored at the time.
In conclusion, by means of the technical scheme of the embodiment of the invention, the operation strategy is simple, and investment is hardly needed; the operation strategy can be automatically realized without manual regulation and control; furthermore, the operating strategy may result in less energy consumption of the system.
Apparatus embodiment one
According to an embodiment of the present invention, an operation strategy determination device for a cogeneration system with heat storage is provided, fig. 3 is a schematic diagram of the operation strategy determination device for a cogeneration system with heat storage according to an embodiment of the present invention, as shown in fig. 3, the operation strategy determination device for a cogeneration system with heat storage according to an embodiment of the present invention specifically includes:
the dividing module 30 is used for dividing the electric load of the whole day into time intervals according to the daily electric load time curve; the dividing module 30 is specifically configured to: the electric load of the whole day is simplified into a peak period, a waist load period and a valley period according to a daily electric load time curve, and the average electric load of the three periods is expressed as formula 1:
Figure RE-GDA0002592695940000091
wherein, PL,p、PL,m、PL,vRespectively representing the average electric load of a peak time period, a waist load time period and a valley time period;
the calculation module 32 is used for calculating the maximum heat supply power of the steam turbine in each time period; calculating the maximum heat storable amount or the required compensation heat amount corresponding to each time period according to the given heat load and the maximum heat supply power of the steam turbine at each time period; the calculation module 32 is specifically configured to: calculating the maximum heat supply power Q of the steam turbine in the peak period, the waist load period and the valley periodG,p、QG,mAnd QG,v(ii) a According to a given thermal load QhMaximum heating power QG,p、QG,mAnd QG,vThe maximum storable heat Q in the peak period is calculated according to the formula 2 to 4X,pMaximum storable heat Q in the waist load periodX,mAnd the amount of heat Q required for off-peak periodsB,v:
QX,p＝QG,p-QhFormula 2;
QX,m＝QG,m-Qhformula 3;
QB,v＝Qh-QG,vformula 4;
the determining module 34 is configured to determine whether a period of time in which heat storage and heat storage are required to be performed is according to the positive or negative of the value of the required compensation heat, where the value of the required compensation heat is positive when the turbine in the period of time corresponding to the value of the required compensation heat cannot meet the heat supply requirement, and is negative otherwise.
The determining module 34 is specifically configured to:
when Q isG,v≤QhAnd QB,vWhen the load is more than or equal to 0, determining that the electric load can not meet the heat load in the valley periodThe heat storage is determined during the peak or waist load period, and the heat release is determined during the valley period.
When Q isG,v＞QhAnd QB,vWhen the peak time interval, the waist load time interval and the valley time interval are less than 0, the unit can meet the requirement of heat load, and heat is not stored at the moment.
When Q isG,v≤QhAnd QB,vWhen the ratio is more than or equal to 0, specifically:
respectively calculating heat accumulation Q in the peak time period and the waist load time period according to a formula 5B,vOf both
Figure RE-GDA0002592695940000102
Efficiency etap、ηm:
Figure RE-GDA0002592695940000101
Wherein E isP、EQ、EMCarried separately for power generation
Figure RE-GDA0002592695940000103
Carried for heat supply
Figure RE-GDA0002592695940000104
And chemistry into the unit
Figure RE-GDA0002592695940000105
When Q isX,p≥QB,v,QX,m≥QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QX,p-QB,v(ii) a If etap＜ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QX,m-QB,v；
When Q isX,m＜QB,v,QX,p≥QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QX,p-QB,v(ii) a If etap＜ηmThen choose to store heat Q in the waist load periodX,mPeak period heat accumulation QB,v-QX,mHeat release at the time of trough QB,v；
When Q isX,m≥QB,v,QX,p＜QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QB,v-QX,p(ii) a If etap＜ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QX,m-QB,v；
When Q isX,m＜QB,v,QX,p＜QB,vWhen, if QX,p+QX,m≥QB,vAnd ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QB,v-QX,p(ii) a If QX,p+QX,m≥QB,vAnd ηp＜ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QB,v-QX,p(ii) a If QX,p+QX,m＜QB,vThen choose to store heat Q in the waist load periodX,mOff-peak heat release QX,p+QX,mPeak period heat accumulation QX,pAn auxiliary heat source is required at this time.
The embodiment of the invention is an embodiment of an apparatus corresponding to the embodiment of the method, and the detailed operation of each module can be understood by referring to the embodiment of the method.
Device embodiment II
An embodiment of the present invention provides a device for determining an operation strategy of a cogeneration system with heat storage, as shown in fig. 4, including: a memory 40, a processor 42 and a computer program stored on the memory 40 and executable on the processor 42, which computer program, when executed by the processor 42, carries out the following method steps:
step 101, dividing the time intervals of the electric load of the whole day according to a daily electric load time curve, and calculating the maximum heat supply power of a steam turbine in each time interval; step 101 specifically includes the following processing:
the electric load of the whole day is simplified into a peak period, a waist load period and a valley period according to a daily electric load time curve, and the average electric load of the three periods is expressed as formula 1:
Figure RE-GDA0002592695940000111
wherein, PL,p、PL,m、PL,vRespectively representing the average electric load of a peak time period, a waist load time period and a valley time period;
calculating the maximum heat supply power Q of the steam turbine in the peak period, the waist load period and the valley periodG,p、QG,mAnd QG,v。
102, calculating the maximum storable heat or the required compensation heat corresponding to each time interval according to the given heat load and the maximum heat supply power of the steam turbine at each time interval; step 102 specifically includes the following processing:
according to a given thermal load QhMaximum heating power QG,p、QG,mAnd QG,vThe maximum storable heat Q in the peak period is calculated according to the formula 2 to 4X,pMaximum storable heat Q in the waist load periodX,mAnd the amount of heat Q required for off-peak periodsB,v:
QX,p＝QG,p-QhFormula 2;
QX,m＝QG,m-Qhformula 3;
QB,v＝Qh-QG,vequation 4.
And 103, determining whether time intervals needing heat storage and heat storage are needed according to the positive and negative values of the heat value to be compensated, wherein the heat value to be compensated is positive when the steam turbine in the time interval corresponding to the heat value to be compensated cannot meet the heat supply requirement, and is negative otherwise.
Step 103 specifically includes the following processing:
when Q isG,v≤QhAnd QB,vAnd when the load is more than or equal to 0, determining that the electric load can not meet the requirement of the heat load in the valley time period, storing heat in the peak or waist load time period, and releasing heat in the valley time period.
When Q isG,v＞QhAnd QB,vWhen the peak time interval, the waist load time interval and the valley time interval are less than 0, the unit can meet the requirement of heat load, and heat is not stored at the moment.
Specifically, when Q isG,v≤QhAnd QB,vWhen the content is more than or equal to 0, the treatment is carried out according to the following conditions:
respectively calculating heat accumulation Q in the peak time period and the waist load time period according to a formula 5B,vOf both
Figure RE-GDA0002592695940000122
Efficiency etap、ηm:
Figure RE-GDA0002592695940000121
Wherein E isP、EQ、EMCarried separately for power generation
Figure RE-GDA0002592695940000123
Carried for heat supply
Figure RE-GDA0002592695940000124
And chemistry into the unit
Figure RE-GDA0002592695940000125
When Q isX,p≥QB,v,QX,m≥QB,vWhen, if ηp≥ηmThen choose to be at the tipPeak period heat accumulation QX,pOff-peak heat release QB,vExothermic heat during waist load period QX,p-QB,v(ii) a If etap＜ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QX,m-QB,v；
When Q isX,m＜QB,v,QX,p≥QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QX,p-QB,v(ii) a If etap＜ηmThen choose to store heat Q in the waist load periodX,mPeak period heat accumulation QB,v-QX,mHeat release at the time of trough QB,v；
When Q isX,m≥QB,v,QX,p＜QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QB,v-QX,p(ii) a If etap＜ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QX,m-QB,v；
When Q isX,m＜QB,v,QX,p＜QB,vWhen, if QX,p+QX,m≥QB,vAnd ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QB,v-QX,p(ii) a If QX,p+QX,m≥QB,vAnd ηp＜ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QB,v-QX,p(ii) a If QX,p+QX,m＜QB,vThen choose to store heat Q in the waist load periodX,mOff-peak heat release QX,p+QX,mPeak period heat accumulation QX,pAn auxiliary heat source is required at this time.
Device embodiment III
The embodiment of the present invention provides a computer-readable storage medium, on which an implementation program for information transmission is stored, and when being executed by a processor 42, the implementation program implements the following method steps:
step 101, dividing the time intervals of the electric load of the whole day according to a daily electric load time curve, and calculating the maximum heat supply power of a steam turbine in each time interval; step 101 specifically includes the following processing:
the electric load of the whole day is simplified into a peak period, a waist load period and a valley period according to a daily electric load time curve, and the average electric load of the three periods is expressed as formula 1:
Figure RE-GDA0002592695940000131
wherein, PL,p、PL,m、PL,vRespectively representing the average electric load of a peak time period, a waist load time period and a valley time period;
calculating the maximum heat supply power Q of the steam turbine in the peak period, the waist load period and the valley periodG,p、QG,mAnd QG,v。
102, calculating the maximum storable heat or the required compensation heat corresponding to each time interval according to the given heat load and the maximum heat supply power of the steam turbine at each time interval; step 102 specifically includes the following processing:
according to a given thermal load QhMaximum heating power QG,p、QG,mAnd QG,vThe maximum storable heat Q in the peak period is calculated according to the formula 2 to 4X,pMaximum storable heat Q in the waist load periodX,mAnd the amount of heat Q required for off-peak periodsB,v:
QX,p＝QG,p-QhFormula 2;
QX,m＝QG,m-Qhformula 3;
QB,v＝Qh-QG,vequation 4.
And 103, determining whether time intervals needing heat storage and heat storage are needed according to the positive and negative values of the heat value to be compensated, wherein the heat value to be compensated is positive when the steam turbine in the time interval corresponding to the heat value to be compensated cannot meet the heat supply requirement, and is negative otherwise.
Step 103 specifically includes the following processing:
when Q isG,v≤QhAnd QB,vAnd when the load is more than or equal to 0, determining that the electric load can not meet the requirement of the heat load in the valley time period, storing heat in the peak or waist load time period, and releasing heat in the valley time period.
When Q isG,v＞QhAnd QB,vWhen the peak time interval, the waist load time interval and the valley time interval are less than 0, the unit can meet the requirement of heat load, and heat is not stored at the moment.
Specifically, when Q isG,v≤QhAnd QB,vWhen the content is more than or equal to 0, the treatment is carried out according to the following conditions:
respectively calculating heat accumulation Q in the peak time period and the waist load time period according to a formula 5B,vOf both
Figure RE-GDA0002592695940000142
Efficiency etap、ηm:
Figure RE-GDA0002592695940000141
Wherein E isP、EQ、EMCarried separately for power generation
Figure RE-GDA0002592695940000143
Carried for heat supply
Figure RE-GDA0002592695940000144
And chemistry into the unit
Figure RE-GDA0002592695940000145
When Q isX,p≥QB,v,QX,m≥QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QX,p-QB,v(ii) a If etap＜ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QX,m-QB,v；
When Q isX,m＜QB,v,QX,p≥QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QX,p-QB,v(ii) a If etap＜ηmThen choose to store heat Q in the waist load periodX,mPeak period heat accumulation QB,v-QX,mHeat release at the time of trough QB,v；
When Q isX,m≥QB,v,QX,p＜QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QB,v-QX,p(ii) a If etap＜ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QX,m-QB,v；
When Q isX,m＜QB,v,QX,p＜QB,vWhen, if QX,p+QX,m≥QB,vAnd ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QB,v-QX,p(ii) a If QX,p+QX,m≥QB,vAnd ηp＜ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QB,v-QX,p(ii) a If QX,p+QX,m＜QB,vThen choose to store heat Q in the waist load periodX,mOff-peak time periodExotherm QX,p+QX,mPeak period heat accumulation QX,pAn auxiliary heat source is required at this time.
The computer-readable storage medium of this embodiment includes, but is not limited to: ROM, RAM, magnetic or optical disks, and the like.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (4)

1. A method for determining an operation strategy of a cogeneration system with heat storage is characterized by comprising the following steps:
the method comprises the following steps of dividing the time intervals of the electric load of the whole day according to a daily electric load time curve, and calculating the maximum heat supply power of a steam turbine in each time interval, wherein the method specifically comprises the following steps:
the electric load of the whole day is simplified into a peak period, a waist load period and a valley period according to a daily electric load time curve, and the average electric load of the three periods is expressed as formula 1:
Figure FDA0003314066570000011
wherein, PL,p、PL,m、PL,vRespectively representing the average electric load of a peak time period, a waist load time period and a valley time period;
calculating the maximum heat supply power Q of the steam turbine in the peak period, the waist load period and the valley periodG,p、QG,mAnd QG,v；
Calculating the maximum storable heat or the required compensation heat corresponding to each time interval according to the given heat load and the maximum heating power of the steam turbine in each time interval, and specifically comprises the following steps:
according to a given thermal load QhMaximum heating power QG,p、QG,mAnd QG,vThe maximum storable heat Q in the peak period is calculated according to the formula 2 to 4X,pMaximum storable heat Q in the waist load periodX,mAnd the amount of heat Q required for off-peak periodsB,v:
QX,p＝QG,p-QhFormula 2;
QX,m＝QG,m-Qhformula 3;
QB,v＝Qh-QG,vformula 4;
determining whether a period of heat storage and heat storage is needed according to the positive and negative of the heat value to be compensated, which specifically comprises the following steps:
when Q isG,v≤QhAnd QB,vWhen the load is more than or equal to 0, determining that the electric load can not meet the requirement of the heat load in the valley period, then determining to store heat in the peak or waist load period, and releasing heat in the valley period, and specifically comprising:
respectively calculating heat accumulation Q in the peak time period and the waist load time period according to a formula 5B,vOf both
Figure FDA0003314066570000022
Efficiency etap、ηm:
Figure FDA0003314066570000021
Wherein E isP、EQ、EMCarried separately for power generation
Figure FDA0003314066570000023
Carried for heat supply
Figure FDA0003314066570000024
And chemistry into the unit
Figure FDA0003314066570000025
When Q isX,p≥QB,v,QX,m≥QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QX,p-QB,v(ii) a If etap<ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QX,m-QB,v；
When Q isX,m<QB,v,QX,p≥QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QX,p-QB,v(ii) a If etap<ηmThen choose to store heat Q in the waist load periodX,mPeak period heat accumulation QB,v-QX,mHeat release at the time of trough QB,v；
When Q isX,m≥QB,v,QX,p<QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QB,v-QX,p(ii) a If etap<ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QX,m-QB,v；
When Q isX,m<QB,v,QX,p<QB,vWhen, if QX,p+QX,m≥QB,vAnd ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QB,v-QX,p(ii) a If QX,p+QX,m≥QB,vAnd ηp<ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QB,v-QX,p(ii) a If QX,p+QX,m<QB,vThen choose to store heat Q in the waist load periodX,mOff-peak heat release QX,p+QX,mPeak period heat accumulation QX,pAt this time, an auxiliary heat source is needed;
when Q isG,v>QhAnd QB,v<When 0, determining a peak time period, a waist load time period and a trough time period, wherein the unit can meet the requirement of heat load, and heat is not stored at the moment;
and when the steam turbine in the time interval corresponding to the heat value to be compensated cannot meet the heat supply requirement, the heat value to be compensated is positive, otherwise, the heat value to be compensated is negative.
2. An operation strategy determination device for a cogeneration system with heat storage is characterized by comprising the following components:
the dividing module is used for dividing the time intervals of the electric loads of all days according to a daily electric load time curve, and the dividing module is specifically used for: the electric load of the whole day is simplified into a peak period, a waist load period and a valley period according to a daily electric load time curve, and the average electric load of the three periods is expressed as formula 1:
Figure FDA0003314066570000031
wherein, PL,p、PL,m、PL,vRespectively representing the average electric load of a peak time period, a waist load time period and a valley time period;
the calculation module is used for calculating the maximum heat supply power of the steam turbine in each time period; according to the given heat load and the maximum heating power of the steam turbine in each period, calculating the maximum storable heat or the required compensation heat corresponding to each period, wherein the calculating module is specifically used for: calculating the maximum heat supply power Q of the steam turbine in the peak period, the waist load period and the valley periodG,p、QG,mAnd QG,v(ii) a According to a given thermal load QhMaximum heating power QG,p、QG,mAnd QG,vThe maximum storable heat Q in the peak period is calculated according to the formula 2 to 4X,pMaximum storable heat Q in the waist load periodX,mAnd the amount of heat Q required for off-peak periodsB,v:
QX,p＝QG,p-QhFormula 2;
QX,m＝QG,m-Qhformula 3;
QB,v＝Qh-QG,vformula 4;
a determining module for determining whether the time interval of heat storage and heat storage is needed according to the positive and negative of the heat value to be compensated, and according to different heat storage conditions and different heat storage conditions
Figure FDA0003314066570000032
The time intervals of heat storage and release are selected according to the efficiency, and heat storage is carried out according to different time intervals
Figure FDA0003314066570000033
Different heat storage tank operation strategies are selected according to the efficiency, wherein when the steam turbine in the time interval corresponding to the heat value to be compensated cannot meet the heat supply requirement, the heat value to be compensated is positive, otherwise, the heat value to be compensated is negative, and the determining module is specifically used for:
when Q isG,v≤QhAnd QB,vWhen the load is more than or equal to 0, determining that the electric load can not meet the requirement of the heat load in the valley period, storing heat in the peak or waist load period, and releasing heat in the valley period;
respectively calculating heat accumulation Q in the peak time period and the waist load time period according to a formula 5B,vOf both
Figure FDA0003314066570000034
Efficiency etap、ηm:
Figure FDA0003314066570000041
Wherein E isP、EQ、EMCarried separately for power generation
Figure FDA0003314066570000042
Carried for heat supply
Figure FDA0003314066570000044
And chemistry into the unit
Figure FDA0003314066570000043
When Q isX,p≥QB,v,QX,m≥QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QX,p-QB,v(ii) a If etap<ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QX,m-QB,v；
When Q isX,m<QB,v,QX,p≥QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QX,p-QB,v(ii) a If etap<ηmThen choose to store heat Q in the waist load periodX,mPeak period heat accumulation QB,v-QX,mHeat release at the time of trough QB,v；
When Q isX,m≥QB,v,QX,p<QB,vWhen, if ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QB,v-QX,p(ii) a If etap<ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QX,m-QB,v；
When Q isX,m<QB,v,QX,p<QB,vWhen, if QX,p+QX,m≥QB,vAnd ηp≥ηmThen choose to accumulate Q during the peak periodX,pOff-peak heat release QB,vExothermic heat during waist load period QB,v-QX,p(ii) a If QX,p+QX,m≥QB,vAnd ηp<ηmThen choose to store heat Q in the waist load periodX,mOff-peak heat release QB,vPeak time exotherm QB,v-QX,p(ii) a If QX,p+QX,m<QB,vThen choose to store heat Q in the waist load periodX,mOff-peak heat release QX,p+QX,mPeak period heat accumulation QX,pAt this time, an auxiliary heat source is needed;
when Q isG,v>QhAnd QB,v<And 0, determining a peak time period, a waist load time period and a trough time period, wherein the unit can meet the requirement of heat load, and heat is not stored at the moment.
3. An operation strategy determination device for a cogeneration system with heat storage is characterized by comprising the following components: memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method of determining an operating strategy of a cogeneration system with heat storage according to claim 1.
4. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon an information transfer implementing program which, when being executed by a processor, implements the steps of the method for determining an operating strategy of a cogeneration system with heat storage according to claim 1.
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