CN112288263A - CCHP system model selection method and system capable of meeting thermoelectric load simultaneously - Google Patents

CCHP system model selection method and system capable of meeting thermoelectric load simultaneously Download PDF

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CN112288263A
CN112288263A CN202011160627.5A CN202011160627A CN112288263A CN 112288263 A CN112288263 A CN 112288263A CN 202011160627 A CN202011160627 A CN 202011160627A CN 112288263 A CN112288263 A CN 112288263A
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郑莆燕
齐同磊
杨义
白天宇
尉清源
姚哲豪
邹思宇
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Shanghai University of Electric Power
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Abstract

The invention relates to a CCHP system model selection method and a CCHP system model selection system simultaneously meeting thermoelectric load, wherein the CCHP system comprises a heat-adjustable gas turbine, and waste heat utilization equipment and production dividing equipment which are connected with the gas turbine, and the method specifically comprises the following steps: calculating the power load characteristic parameter and the heat load characteristic parameter of a user, the power supply regulation characteristic parameter and the waste heat supply regulation characteristic parameter of the gas turbine, selecting the model of the gas turbine meeting the judgment condition as an available model, and determining the available range of the number n of sets of the available model of the gas turbine and the minimum capacity of the production equipment. Compared with the prior art, the invention has the advantages of reduced capacity of production equipment, reduced energy consumption of the system, strong universality and the like.

Description

CCHP system model selection method and system capable of meeting thermoelectric load simultaneously
Technical Field
The invention relates to the field of distributed energy supply system design, in particular to a CCHP system model selection method and system capable of meeting thermoelectric loads.
Background
The CCHP system is also called a combined cooling heating and power system, and a distributed combined cooling heating and power system using natural gas as energy is a main form of a distributed energy supply system. The system uses a gas turbine or a gas internal combustion engine as a prime motor to generate power, and then uses the exhaust waste heat of the prime motor to drive the waste heat utilization equipment, so as to provide the cold and heat required by users and realize the cascade utilization of energy. The reasonable collocation can enable the system to achieve high comprehensive utilization efficiency, has wide application prospect, can be used as the supplement of centralized energy supply, and has higher and higher power generation proportion.
The distributed combined cooling heating and power system has many problems. When a system is initially designed, a design strategy of determining electricity by heat or determining heat by electricity is generally adopted, wherein the former aims at meeting the heat load of a user, electricity is sold to a power grid when the electricity quantity is sufficient, and electricity is purchased to the power grid when the electricity quantity is insufficient; the latter aims at meeting the electrical load of users, releases redundant heat to the atmosphere when the residual heat is sufficient, and buys heat from the outside when the residual heat is insufficient. The two basic design strategies are carried out on the premise of meeting the maximum requirements of users, and the loads of the users are unstable in one day, so that the energy supply of the CCHP system is not matched, the phenomena of low equipment utilization rate, equipment halt or introduction of production dividing equipment occur, the operating efficiency of the CCHP system is reduced, and energy waste is caused.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a CCHP system model selection method and a CCHP system model selection system which simultaneously meet the thermoelectric load, so that the capacity of production dividing equipment is reduced, the energy consumption of the system is reduced, and the universality is high.
The purpose of the invention can be realized by the following technical scheme:
a CCHP system model selection method simultaneously meeting thermoelectric load comprises the following steps:
calculating the characteristic parameters E of the electrical load of the userLAnd using the characteristic parameter Q of the thermal loadLAnd power supply regulation of gas turbineSign parameter EGAnd supply the waste heat to regulate the characteristic parameter QGThe calculation formula is as follows:
Figure BDA0002744198210000021
Figure BDA0002744198210000022
Figure BDA0002744198210000023
Figure BDA0002744198210000024
wherein L ise，minFor the minimum load of the user, Le，maxFor maximum electrical load of the user, Lq，minMinimum residual heat load required for the user, Lq，maxMaximum residual heat load required for the user, Ge，minMinimum power generation for gas turbine, Ge，maxFor maximum power generation of the gas turbine, Gq，minFor minimum heating power of gas turbine, Gq，maxMaximum heating power for the gas turbine;
selecting the model of the gas turbine which meets the judgment condition as an available model, wherein the judgment condition is as follows: eG<ELAnd QG<QL；
Determining an available range of the number n of sets of available models of gas turbines according to the following conditions:
nGe，max>Le，max
nGe，min＜Le，min
if the power generation power of the available type gas turbine is Ge，minMaximum heating power Ge＝emin，maxLess than Lq，minStarting the production-dividing equipment and calculating the minimum capacity delta of the production-dividing equipment, wherein the calculation formula is as follows:
Δ＝Lq，min-Ge＝emin，max
otherwise, the production-sharing equipment is not enabled.
The CCHP system comprises a gas turbine with adjustable heat recovery, and a waste heat utilization device and a production dividing device which are connected with the gas turbine, wherein the gas turbine comprises a gas compressor, a heat regenerator, a combustion chamber, a gas turbine, a heat recovery regulating valve and a generator, and the specific working flow is as follows:
the air is input into a compressor to be boosted and then enters a heat regenerator to be heated, then is mixed with natural gas in a combustion chamber and then is ignited into high-temperature and high-pressure gas, the high-temperature and high-pressure gas enters a gas turbine to be expanded and do work, one part of the output work of the gas turbine is input into the compressor to boost the air, and the other part of the output work drives a generator to generate electricity. One part of flue gas discharged by a gas turbine enters a heat regenerator to heat air, the heating amount of the flue gas is controlled by a valve, the other part of flue gas is directly discharged, finally the flue gas is converged into a strand of flue gas and flows into a next stage waste heat utilization device to generate cold and heat required by a user, one part of the power generated by the gas turbine is directly sent to the user, the other part of the power generated by the gas turbine is sent to a sub-production device to generate the cold and heat required by the user, and the waste heat utilization device and the sub-production device share the cold and heat required by the user; meanwhile, the phenomenon of mismatching of energy supply of the CCHP system can be solved by considering the thermoelectric load, namely, the CCHP system only has primary energy input and does not have thermoelectric exchange with the outside, the thermoelectric load of a user is met by the CCHP system, the generated energy of the generator is adjusted according to the variation of the thermoelectric load of the user, the flue gas waste heat provided to the downstream is controlled by adjusting the opening of the heat regenerator, and the adjustment of the output of the separate generation equipment is assisted, so that the thermoelectric load of the user is met, the energy waste is reduced to the maximum extent, and the utilization rate of the. When the CCHP system is designed, the available models of hot gas turbines and the range of the number of sets of the hot gas turbines are selected according to the thermoelectric load of a user, and the minimum capacity of the production equipment is determined.
Further, an e/q-n diagram is created with the thermal power value and the electric power value as the ordinate and the abscissa, respectively, and a first rectangular frame and a second rectangular frame are drawn, the first rectangular frame being indicated by (L)e，min,Lq，min) And (L)e，max,Lq，max) For diagonal vertices, the second rectangle is enclosed by (nG)e，min,nGq，min) And (nG)e，max,nGq，max) For diagonal vertices, if the first rectangular box is contained within the second rectangular box, the number of sets n for the available model is available.
Further, according to the maximum value and the minimum value of the heating power of the available gas turbines at different power generation powers, the actual thermoelectric regulation areas of n gas turbines are drawn on the e/q-n graph, and if the first rectangular frame exceeds the actual thermoelectric regulation areas, the production dividing equipment is started.
Further, the minimum capacity of the plant is obtained by subtracting the upper boundary value of the actual thermoelectric regulation region at the minimum generated power from the lower boundary value of the first rectangular frame.
Further, a feature parameter map is created, and marked on the feature parameter map (E)L,QL) And (E)G,QG) Through (E)L,QL) Drawing a vertical line between the horizontal axis and the vertical axis to divide the characteristic parameter graph into four areas, namely, upper left, lower left, upper right and lower right areas, if (E)G,QG) And the model of the corresponding gas turbine is the available model when the gas turbine is positioned in the lower left area or on the boundary of the lower left area.
A CCHP system model selection system that simultaneously satisfies thermoelectric loads, comprising:
an electric heating load calculation module for calculating the characteristic parameters E of the electric heating loadLAnd using the characteristic parameter Q of the thermal loadLThe calculation formula is as follows:
Figure BDA0002744198210000031
Figure BDA0002744198210000032
wherein L ise，minFor the minimum load of the user, Le，maxFor maximum electrical load of the user, Lq，minMinimum residual heat load required for the user, Lq，maxFor the userThe required maximum residual heat load;
an electric heating power calculation module: method for calculating a characteristic variable E of a gas turbineGAnd a characteristic parameter QG for waste heat regulation, wherein the calculation formula is as follows:
Figure BDA0002744198210000041
Figure BDA0002744198210000042
wherein G ise，minMinimum power generation for gas turbine, Ge，maxFor maximum power generation of the gas turbine, Gq，minFor minimum heating power of gas turbine, Gq，maxMaximum heating power for the gas turbine;
available model screening module; the method is used for selecting the available model of the gas turbine and the available range of the number n of sets, and selecting the model of the gas turbine meeting the judgment condition as the available model, wherein the judgment condition is as follows: eG<ELAnd QG<QL；
Determining an available range of the number n of sets of available models of gas turbines according to the following conditions:
nGe，max>Le，max
nGe，min＜Le，min
if the power generation power of the available type gas turbine is Ge，minMaximum heating power Ge＝emin，maxLess than Lq，minStarting the production-dividing equipment and calculating the minimum capacity delta of the production-dividing equipment, wherein the calculation formula is as follows:
Δ＝Lq，min-Ge＝emin，max
otherwise, the production-sharing equipment is not enabled.
Further, the available model screening module comprises a first drawing unit and a first identification unit;
the first drawing units are respectively established byAn e/q-n diagram with thermal power value and electric power value as ordinate and abscissa, drawing a first rectangular frame and a second rectangular frame, the first rectangular frame being indicated by (L)e，min,Lq，min) And (L)e，max,Lq，max) For diagonal vertices, the second rectangle is enclosed by (nG)e，min,nGq，min) And (nG)e，max,nGq，max) Is a diagonal vertex;
the first identification unit is used for identifying a second rectangular frame comprising the first rectangular frame, and the number n of sets of available models corresponding to the second rectangular frame is available.
Further, the first plotting unit plots the maximum value and the minimum value of the heating power of the available gas turbines at different power generation powers on an e/q-n diagram, wherein the n actual thermoelectric regulation areas of the gas turbines are plotted;
the first identification unit is used for identifying whether the first rectangular frame exceeds an actual thermoelectric regulation area, if so, the production division equipment is started, otherwise, the production division equipment is not started.
Further, the available model screening module further comprises a calculating unit, and the calculating unit subtracts an upper boundary value of the actual thermoelectric regulation area under the minimum power generation power from a lower boundary value of the first rectangular frame to obtain the minimum capacity of the production dividing equipment.
Further, the system also comprises a second drawing unit and a second identification unit;
the second drawing unit creates a feature parameter map, and marks (E) on the feature parameter mapL,QL) And (E)G,QG) Through (E)L,QL) Drawing a vertical line of a horizontal axis and a vertical axis, and dividing the characteristic parameter graph into four areas, namely an upper left area, a lower left area, an upper right area and a lower right area;
said second recognition unit recognizing (E) the region located at the lower left or at the boundary thereofG,QG) And the model of the corresponding gas turbine is the available model.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention first selects the compound satisfying EG<ELAnd QG<QLThe model of the gas turbine is used as an available model, then the thermoelectric power range and the user electric heating load range of a plurality of available models of gas turbines are compared, the range of the number of sets of the gas turbines meeting the electric heating load requirements of users is selected, the fluctuation of the user electric heating load is fully considered, the adjusting function of the gas turbine with adjustable heat regeneration is exerted, the opening degree of a heat regenerator is adjusted to control the residual heat quantity of the flue gas provided to the downstream, the starting condition of the separate production equipment and the minimum capacity during starting are determined, the simultaneous satisfaction of the user electric heating load is ensured, the energy waste is reduced to the maximum extent, the energy consumption of a CCHP system is reduced, the utilization rate of the equipment is improved, and;
(2) the method establishes the e/q-n diagram and the characteristic parameter diagram, determines the available model, the range of the number of sets of the gas turbine and the minimum capacity of the production dividing equipment in the form of the diagram, and is simple, intuitive and high in accuracy.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a feature parameter graph;
FIG. 3 is an enlarged view taken at A in FIG. 2;
FIG. 4 is an e/q-n plot for a C65 gas turbine;
FIG. 5 is an e/q-n diagram of a C200 gas turbine engine;
FIG. 6 is a schematic diagram of a distributed energy supply system with adjustable heat regeneration;
the reference numbers in the figures illustrate:
1. the system comprises a compressor, 2 parts of a heat regenerator, 3 parts of a combustion chamber, 4 parts of a gas turbine, 5 parts of a heat regeneration regulating valve, 6 parts of a generator, 7 parts of waste heat utilization equipment and 8 parts of production equipment.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 6, the CCHP system includes a gas turbine capable of adjusting heat regeneration, and a waste heat utilization device 7 and a production dividing device 8 connected to the gas turbine, the gas turbine includes a gas compressor 1, a heat regenerator 2, a combustion chamber 3, a gas turbine 4, a heat regeneration regulating valve 5 and a generator 6, and the specific working flow is as follows:
air is input into a compressor 1 to be boosted and then enters a heat regenerator 2 to be heated, then is mixed with natural gas in a combustion chamber 3 and then is ignited into high-temperature and high-pressure gas, the high-temperature and high-pressure gas enters a gas turbine 4 to be expanded and do work, one part of the output work of the gas turbine 4 is input into the compressor 1 to boost the air, and the other part of the output work drives a generator 6 to generate electricity. One part of the flue gas discharged by the gas turbine 4 enters the heat regenerator 2 to heat air, the heating amount of the flue gas is controlled by the valve 5, the other part of the flue gas is directly discharged, finally the flue gas is converged into one part of flue gas and flows into the lower-stage waste heat utilization equipment 7 to generate the cold and heat required by a user, one part of the power generated by the gas turbine is directly sent to the user, and the other part of the power generated by the gas turbine is sent to the sub-production equipment 8 to generate the cold and heat required by the user. The waste heat utilization equipment 7 and the production dividing equipment 8 share the cold and heat required by the user;
meanwhile, the phenomenon of mismatching of energy supply of the CCHP system can be solved by considering the thermoelectric load, namely, the CCHP system only has primary energy input and does not have thermoelectric exchange with the outside, the thermoelectric load of a user is met by the CCHP system, the generated energy of the generator 6 is adjusted according to the variation of the thermoelectric load of the user, the flue gas waste heat provided to the downstream is controlled by adjusting the opening of the heat regenerator 2, and the output of the separate production equipment 8 is adjusted, so that the thermoelectric load of the user is met, the energy waste is reduced to the maximum extent, and the utilization rate of the equipment is improved. In designing the CCHP system, the available models of hot gas turbines and the range of sets are selected according to the user's thermoelectric load, and the minimum capacity of the separation plant 8 is determined.
Example 1
A CCHP system model selection method simultaneously meeting thermoelectric load is shown in figure 1, and specifically comprises the following steps:
s1: according to the characteristic parameters E of the electrical load of the userLAnd using the characteristic parameter Q of the thermal loadLAnd a characteristic parameter E for regulating the power supply of the gas turbineGAnd supply the waste heat to regulate the characteristic parameter QGDetermining a usable model number of the gas turbine;
s2: determining the range of the number of sets of the gas turbine which meet the thermoelectric load requirements of users;
s3: the enabling conditions and the minimum capacity of the production equipment are determined.
ELAnd QLThe calculation formula of (2) is as follows:
Figure BDA0002744198210000061
Figure BDA0002744198210000062
wherein L ise，minFor the minimum load of the user, Le，maxFor maximum electrical load of the user, Lq，minMinimum residual heat load required for the user, Lq，maxThe maximum residual heat load required by the user, the electric load ranges and the average values of the residual heat load time of the user in summer, transition season and winter are shown in table 1:
TABLE 1 user load parameter Table
Figure BDA0002744198210000071
Calculating E according to Table 1LIs 0.2483, QL0.9598;
EGand QGThe calculation formula of (2) is as follows:
Figure BDA0002744198210000072
Figure BDA0002744198210000073
wherein G ise，minMinimum power generation for gas turbine, Ge，maxFor maximum power generation of the gas turbine, Gq，minFor minimum heating power of gas turbine, Gq，maxRegulation of the heat of the gas turbine Capstone C65 and Capstone C200 for maximum heating capacity of the gas turbineThe parameters are shown in table 2:
TABLE 2 gas turbine basic parameter table
Figure BDA0002744198210000074
Calculating and obtaining the E of the C65 model gas turbine according to the table 2GIs 0.2, QGModel E of 0.2115, C200 gas turbineGIs 0.2, QG0.1703;
referring to fig. 2 and 3, a feature parameter map is created, and a user feature point (E) is marked on the feature parameter mapL,QL) And C65 gas turbine, C200 gas turbine characteristic points (E)G,QG) Through (E)L,QL) Drawing a vertical line of a horizontal axis and a vertical axis, dividing the characteristic parameter graph into four areas, namely an upper left area, a lower left area, an upper right area and a lower right area, wherein the four areas are respectively corresponding to a second area, a first area, a fourth area and a third area, and the first area satisfies EG<ELAnd QG<QLThe thermoelectric regulation capacity of the gas turbine satisfies the customer demand, and the second region satisfies EG<ELAnd QG>QLThe waste heat regulating capacity of the gas turbine can not meet the user requirement, and the third area meets EG>ELAnd QG<QLThe electric power regulation of the gas turbine can not meet the requirement of a user, and the fourth area meets EG>ELAnd QG>QLThe thermoelectric regulation capacity of the gas turbine cannot meet the user requirements;
the characteristic points of the gas turbines of the C65 gas turbine and the C200 gas turbine are both located in the first area and can meet the requirements of users, and in the aspect of waste heat regulation characteristic parameters, the QG of the C200 gas turbine is smaller than that of the C65 gas turbine, which shows that the waste heat regulation capacity of the C200 gas turbine is superior to that of the C65 gas turbine, and the capacity of adapting to user energy change is stronger;
determining an available range of the number n of sets of available models of gas turbines according to the following conditions:
nGe，max>Le，max
nGe，min＜Le，min
if the power generation power of the available type gas turbine is Ge，minMaximum heating power Ge＝emin，maxLess than Lq，minThen, the production-dividing equipment 8 is started, and the minimum capacity Δ of the production-dividing equipment is calculated, and the calculation formula is:
Δ＝Lq，min-Ge＝emin，max
otherwise the production-splitting device 8 is not enabled.
Creating an e/q-n diagram with the thermal power value and the electric power value as ordinate and abscissa, respectively, drawing a first rectangular frame and a second rectangular frame, the first rectangular frame being represented by (L)e，min,Lq，min) And (L)e，max,Lq，max) As diagonal vertices, as user load regions, second rectangle box with (nG)e，min,nGq，min) And (nG)e，max,nGq，max) The diagonal vertex is used as the adjusting area of the gas turbine, and if the first rectangular frame is contained in the second rectangular frame, the number n of the sets of the available models is available;
comparing the gas turbine regulation region and the user load region when the number of C65 gas turbine sets is between 17 and 22 as shown in FIG. 4, and nG when n is 17e，max＜Le，maxCannot meet the user electricity demand, and nG is 22 hourse，min＞Le，minWhen the minimum power supply amount of the system is slightly larger than the minimum electric load of a user, the situation of excessive power generation occurs, and when n is more than or equal to 18 and less than or equal to 21, the system operation adjusting area comprises a user thermoelectric load area and meets the selection requirement of the number of sets;
referring to FIG. 5, C200 is the comparison between the gas turbine regulation area and the customer load area when the number of sets of gas turbine is 5-7, and nG when n is 5e，max＜Le，maxCannot meet the electricity demand of the user, and nG is 7 hours when n is equal toe，min＞Le，minWhen the minimum power supply amount of the system is slightly larger than the minimum electric load of a user, excessive power generation can happen, and when n is 6, the system operation regulation area comprises a user thermoelectric load area and meets the selection requirement of the number of sets.
As shown in FIG. 4, after the number of sets of C65 gas turbines is determined to be 18 ≤ n ≤ 21, the actual thermoelectric regulation areas of the 18 and 21C 65 gas turbines are respectively drawn on the e/q-n diagram according to the maximum and minimum values of the heating power of the C65 gas turbine at different power generation powers, and the intersection line L of the actual thermoelectric regulation area and the first rectangular frame1L2A starting judgment curve of the production equipment 8 is shown, the production equipment 8 needs to be started on the left side of the production equipment, namely when the electric load is 542.8234kW lower, the upper boundary value of the actual thermoelectric regulation area under the minimum generating power is subtracted from the lower boundary value of the first rectangular frame, the minimum capacity of the production equipment 8 is obtained, and n is the minimum capacity delta of the production equipment 8 when the minimum capacity delta is 181717.7211 kW; minimum capacity Δ of production plant 8 when n is 212＝514.8813kW。
Similarly, as shown in fig. 5, the number of sets of C200 gas turbines is 6, when the electric load of the user is lower than 626.411kW, the power dividing equipment needs to be started, and the minimum capacity delta of the required power dividing equipment 831007.249 kW.
The results of the C65 gas turbine model selection are shown in table 3:
TABLE 3C 65 gas turbine model selection summary sheet
Number of sets 18 19 20 21
Fractional production equipment starting power (kW) 542.8234 521.4519 500.0804 478.709
Minimum capacity of production equipment (kW) 717.7211 650.1079 582.4946 514.8813
From table 3, as the number of sets of C65 gas turbines increases, both the starting power and the minimum capacity of the power plant 8 decrease, because the number of sets of C65 gas turbines increases, the actual thermoelectric regulation area appears to shift upward on the e/q-n diagram, resulting in a leftward shift of the intersection line of the actual thermoelectric regulation area and the user thermoelectric load area, and thus both the starting power and the minimum capacity of the power plant 8 decrease.
The results of the type selection for the C200 gas turbine are shown in Table 4:
TABLE 4C 200 gas turbine selection summary sheet
Number of sets 6
Fractional production equipment starting power (kW) 626.411
Minimum capacity of production equipment (kW) 1007.249
Example 2
A CCHP system model selection system for simultaneous satisfaction of thermoelectric loading corresponding to example 1, comprising:
an electric heating load calculation module for calculating the characteristic parameters E of the electric heating loadLAnd using the characteristic parameter Q of the thermal loadLThe calculation formula is as follows:
Figure BDA0002744198210000091
Figure BDA0002744198210000092
wherein L ise，minFor the minimum load of the user, Le，maxFor maximum electrical load of the user, Lq，minMinimum residual heat load required for the user, Lq，maxThe maximum waste heat load required by the user;
an electric heating power calculation module: method for calculating a characteristic variable E of a gas turbineGAnd a characteristic parameter QG for waste heat regulation, wherein the calculation formula is as follows:
Figure BDA0002744198210000093
Figure BDA0002744198210000094
wherein G ise，minMinimum power generation for gas turbine, Ge，maxFor maximum power generation of the gas turbine, Gq，minFor minimum heating power of gas turbine, Gq，maxMaximum heating power for the gas turbine;
available model screening module; the method is used for selecting the available model of the gas turbine and the available range of the number n of sets, selecting the model of the gas turbine meeting the judgment condition as the available model, and judging the conditions as follows: eG<ELAnd QG<QL；
Determining an available range of the number n of sets of available models of gas turbines according to the following conditions:
nGe，max>Le，max
nGe，min＜Le，min
if the power generation power of the available type gas turbine is Ge，minMaximum heating power Ge＝emin，maxLess than Lq，minThen, the production-dividing equipment 8 is started, and the minimum capacity Δ of the production-dividing equipment is calculated, and the calculation formula is:
Δ＝Lq，min-Ge＝emin，max
otherwise the enabling of the separate production device 8 is not enabled.
The available model screening module comprises a first drawing unit, a first identification unit, a second drawing unit and a second identification unit;
the first drawing unit creates an e/q-n map having a thermal power value and an electric power value as ordinate and abscissa, respectively, and draws a first rectangular frame and a second rectangular frame, the first rectangular frame being represented by (L)e，min,Lq，min) And (L)e，max,Lq，max) As diagonal vertices, a second rectangular box with (nG)e，min,nGq，min) And (nG)e，max,nGq，max) Is a diagonal vertex;
the first identification unit is used for identifying a second rectangular frame comprising the first rectangular frame, and the number n of sets of available models corresponding to the second rectangular frame is available.
The first drawing unit draws the actual thermoelectric regulation areas of n gas turbines on an e/q-n diagram according to the maximum value and the minimum value of the heating power of the available gas turbines at different power generation powers;
the first identification unit is used for identifying whether the first rectangular frame exceeds the actual thermoelectric regulation area, if so, the production dividing equipment 8 is started, otherwise, the production dividing equipment 8 is not started.
The available model screening module further comprises a calculating unit, and the calculating unit subtracts an upper boundary value of the actual thermoelectric regulating area under the minimum generating power from a lower boundary value of the first rectangular frame to obtain the minimum capacity of the production dividing equipment 8.
The second drawing unit creates a feature parameter map, which is marked (E)L,QL) And (E)G,QG) Through (E)L,QL) Drawing a vertical line of a horizontal axis and a vertical axis, and dividing the characteristic parameter graph into four areas, namely an upper left area, a lower left area, an upper right area and a lower right area;
the second recognition unit recognizes (E) located at the lower left region or the boundary thereofG,QG) And the model of the corresponding gas turbine is the available model.
The embodiment 1 and the embodiment 2 provide a CCHP system model selection method and a CCHP system model selection system which can simultaneously meet thermoelectric loads for a distributed energy supply system, the fluctuation of the thermoelectric loads of users is fully considered, the adjusting function of a heat-returning-adjustable gas turbine is exerted, the opening degree of a heat returning device is adjusted to control the amount of residual heat of flue gas provided to the downstream, the starting condition of a separate generation device 8 and the minimum capacity during starting are determined, the thermoelectric loads of the users are guaranteed to be simultaneously met, the energy waste is reduced to the maximum extent, the energy consumption of the CCHP system is reduced, the device utilization rate is improved, the universality is strong, meanwhile, the available model, the range of the number of sets of the gas turbine and the minimum capacity of the separate generation device 8 are determined in a graph mode through establishing an e/q-n graph and a characteristic parameter graph, and the method and.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (10)

1. A CCHP system model selection method simultaneously meeting thermoelectric load is characterized in that the CCHP system comprises a gas turbine with adjustable heat return, and waste heat utilization equipment and separate production equipment which are connected with the gas turbine, and the method specifically comprises the following steps:
calculating the electricity utilization load of the userCharacteristic parameter of load ELAnd using the characteristic parameter Q of the thermal loadLAnd a characteristic parameter E for regulating the power supply of the gas turbineGAnd supply the waste heat to regulate the characteristic parameter QGThe calculation formula is as follows:
Figure FDA0002744198200000011
Figure FDA0002744198200000012
Figure FDA0002744198200000013
Figure FDA0002744198200000014
wherein L ise，minFor the minimum load of the user, Le，maxFor maximum electrical load of the user, Lq，minMinimum residual heat load required for the user, Lq，maxMaximum residual heat load required for the user, Ge，minMinimum power generation for gas turbine, Ge，maxFor maximum power generation of the gas turbine, Gq，minFor minimum heating power of gas turbine, Gq，maxMaximum heating power for the gas turbine;
selecting the model of the gas turbine which meets the judgment condition as an available model, wherein the judgment condition is as follows: eG<ELAnd QG<QL；
Determining an available range of the number n of sets of available models of gas turbines according to the following conditions:
nGe，max>Le，max
nGe，min＜Le，min
if the power generation power of the available type gas turbine is Ge，minMaximum heating power Ge＝emin，maxLess than Lq，minThen, the production-dividing equipment is started, and the minimum capacity Δ of the production-dividing equipment is:
Δ＝Lq，min-Ge＝emin，max
otherwise, the production-sharing equipment is not enabled.
2. The method of claim 1, wherein an e/q-n plot is created with thermal and electrical power values as ordinate and abscissa, respectively, and a first rectangular box and a second rectangular box are plotted, the first rectangular box being represented by (L)e，min,Lq，min) And (L)e，max,Lq，max) For diagonal vertices, the second rectangle is enclosed by (nG)e，min,nGq，min) And (nG)e，max,nGq，max) For diagonal vertices, if the first rectangular box is contained within the second rectangular box, the number of sets n for the available model is available.
3. The method of claim 2, wherein the actual thermoelectric regulation areas of n gas turbines are plotted on an e/q-n diagram according to the maximum value and the minimum value of the heating power of the available gas turbines at different power generation powers, and if the first rectangular frame exceeds the actual thermoelectric regulation areas, the separate power generation equipment is activated.
4. The method of claim 3, wherein the minimum capacity of the plant is obtained by subtracting the upper boundary value of the actual thermoelectric regulation area at the minimum generated power from the lower boundary value of the first rectangular box.
5. The method of claim 1, wherein a map of characteristic parameters is created and marked (E) on the map of characteristic parametersL,QL) And (E)G,QG) Through (E)L,QL) Drawing a vertical line between the horizontal axis and the vertical axis to divide the characteristic parameter graph into four areas, namely, upper left, lower left, upper right and lower right areas, if (E)G,QG) And the model of the corresponding gas turbine is the available model when the gas turbine is positioned in the lower left area or on the boundary of the lower left area.
6. A CCHP system profiling system for simultaneously satisfying thermoelectric loads, comprising:
an electric heating load calculation module for calculating the characteristic parameters E of the electric heating loadLAnd using the characteristic parameter Q of the thermal loadLThe calculation formula is as follows:
Figure FDA0002744198200000021
Figure FDA0002744198200000022
wherein L ise，minFor the minimum load of the user, Le，maxFor maximum electrical load of the user, Lq，minMinimum residual heat load required for the user, Lq，maxThe maximum waste heat load required by the user;
an electric heating power calculation module: method for calculating a characteristic variable E of a gas turbineGAnd a characteristic parameter QG for waste heat regulation, wherein the calculation formula is as follows:
Figure FDA0002744198200000023
Figure FDA0002744198200000024
wherein G ise，minMinimum power generation for gas turbine, Ge，maxFor maximum power generation of the gas turbine, Gq，minFor the minimum heating power of the gas turbine,Gq，maxmaximum heating power for the gas turbine;
available model screening module; the method is used for selecting the available model of the gas turbine and the available range of the number n of sets, and selecting the model of the gas turbine meeting the judgment condition as the available model, wherein the judgment condition is as follows: eG<ELAnd QG<QL；
Determining an available range of the number n of sets of available models of gas turbines according to the following conditions:
nGe，max>Le，max
nGe，min＜Le，min
if the power generation power of the available type gas turbine is Ge，minMaximum heating power Ge＝emin，maxLess than Lq，minStarting the production-dividing equipment and calculating the minimum capacity delta of the production-dividing equipment, wherein the calculation formula is as follows:
Δ＝Lq，min-Ge＝emin，max
otherwise, the production-sharing equipment is not enabled.
7. The CCHP system model selection system for simultaneously satisfying thermoelectric loads as recited in claim 6, wherein said available model selection module comprises a first plotting unit and a first identification unit;
the first drawing unit creates an e/q-n map having a thermal power value and an electric power value as ordinate and abscissa, respectively, and draws a first rectangular frame and a second rectangular frame, the first rectangular frame being defined by (L)e，min,Lq，min) And (L)e，max,Lq，max) For diagonal vertices, the second rectangle is enclosed by (nG)e，min,nGq，min) And (nG)e，max,nGq，max) Is a diagonal vertex;
the first identification unit is used for identifying a second rectangular frame comprising the first rectangular frame, and the number n of sets of available models corresponding to the second rectangular frame is available.
8. The CCHP system model selection system simultaneously satisfying thermoelectric load as claimed in claim 7, wherein said first mapping unit maps n actual thermoelectric regulation areas of the gas turbine on an e/q-n map according to maximum and minimum values of heating power at different power generation powers of available gas turbines;
the first identification unit is used for identifying whether the first rectangular frame exceeds an actual thermoelectric regulation area, if so, the production division equipment is started, otherwise, the production division equipment is not started.
9. The CCHP system model selection system simultaneously satisfying thermoelectric load as claimed in claim 8, wherein said available model screening module further comprises a calculating unit, said calculating unit subtracting the upper boundary value with the minimum generated power of the actual thermoelectric regulation area from the lower boundary value of the first rectangular frame to obtain the minimum capacity of the power-dividing equipment.
10. The CCHP system model selection system for simultaneously satisfying thermoelectric loads as recited in claim 6, further comprising a second plotting unit and a second identification unit;
the second drawing unit creates a feature parameter map, and marks (E) on the feature parameter mapL,QL) And (E)G,QG) Through (E)L,QL) Drawing a vertical line of a horizontal axis and a vertical axis, and dividing the characteristic parameter graph into four areas, namely an upper left area, a lower left area, an upper right area and a lower right area;
said second recognition unit recognizing (E) the region located at the lower left or at the boundary thereofG,QG) And the model of the corresponding gas turbine is the available model.
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