CN114282828A - Carbon circulation system and application thereof - Google Patents

Carbon circulation system and application thereof Download PDF

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CN114282828A
CN114282828A CN202111617864.4A CN202111617864A CN114282828A CN 114282828 A CN114282828 A CN 114282828A CN 202111617864 A CN202111617864 A CN 202111617864A CN 114282828 A CN114282828 A CN 114282828A
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power
gas
carbon
supercritical
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王玮
张光明
牛玉广
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North China Electric Power University
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North China Electric Power University
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Abstract

The invention discloses a carbon circulation system, comprising CO2Generation system, carbon capture device, electric gas conversion device and supercritical CO2A power plant wherein the carbon capture system captures carbon dioxide produced by coal and natural gas into an electric gas conversion plant and supercritical CO2The system provides a carbon source. When the load demand of the power system is low, the lowest output of the coal-fired unit is reduced through the carbon capture system so as to accommodate more renewable energy sources; the surplus renewable energy power generation will be consumed by the electric gas conversion device. The carbon circulation system can be applied to the optimized scheduling of the comprehensive energy system comprising new energyIn (1).

Description

Carbon circulation system and application thereof
Technical Field
The invention belongs to the field of resource recycling and carbon emission reduction, and particularly relates to a carbon circulating system and application thereof.
Background
In recent years, renewable energy has been developed in the field of power generation due to its low emissions and sustainability. However, the randomness and volatility of renewable energy sources also pose significant challenges to the safe operation of power systems. The comprehensive energy system canMultiple energy sources are combined, on the basis of realizing the balance of power supply and demand of the energy sources of electric power and heat, more new energy sources are promoted to be connected into a power grid, and carbon emission is reduced. However, not all new energy output can be fully utilized, resulting in resource waste and large amount of carbon emission. There is a need to recover CO generated by coal and gas combustion2To promote energy utilization efficiency and realize carbon emission reduction.
Object of the Invention
The invention aims to provide a carbon circulating system for promoting energy utilization efficiency and carbon emission reduction and an application scene, so as to solve the defects in the background technology. The carbon circulating system is applied to the comprehensive energy system, and can provide support for improving the energy utilization efficiency, the penetration of new energy and low carbon emission.
Disclosure of Invention
According to an aspect of the present invention, there is provided a carbon cycle system comprising CO2A generation subsystem, a carbon capture device, an electric gas conversion device, wherein the CO2The generating subsystem includes the generation of a channel with CH4Gas turbine GT and gas boiler GB using fuel, and heat and power cogeneration CHP and supercritical CO using coal as fuel2A power plant; the carbon capture device captures CO2CO produced in the production subsystem2In particular from the group comprising gas turbine GT, gas boiler GB, combined heat and power CHP and supercritical CO2Separation and capture of CO from flue gases generated in power plants2Said supercritical CO2Power plant using S-CO2Generating power by the unit; captured CO2A part enters into supercritical CO2A part of the working fluid used as a supplementary working fluid in the power plant enters an electric gas conversion device P2G; the carbon circulating system is used in an integrated energy system which comprises a power generation device, a heat supply device and an energy conversion device, wherein the power generation device comprises a wind power or photovoltaic new energy power generation device, a gas turbine, a gas boiler, cogeneration and supercritical CO2A power plant; when the output of the new energy power generation device is high, the electric gas conversion device P2G in the carbon circulation system uses surplus electric power to convert part of CO2Reduction ofTo CH4And sent to the gas turbine GT or gas boiler GB as fuel.
According to another aspect of the present invention, there is provided a method for using the above carbon cycle system for optimal scheduling of an integrated energy system, comprising the steps of:
step 1, establishing CO2Generating a process model: CO generated in the power generation process2The sources of (a) are designated natural gas and coal; for a natural gas power generation process, the output of a gas turbine and a gas boiler is characterized as shown in equation (1):
Figure BDA0003435393710000021
wherein P and H are respectively the electric power and thermal power output of the unit, eta is the electric or thermal production efficiency, Q is the consumption rate of natural gas, HNGIs the heat value of natural gas. The superscripts GT and GB represent a gas turbine and a gas boiler, respectively, and the subscripts i and j represent serial numbers of the gas turbine and the gas boiler, respectively;
will the ith gas turbine
Figure BDA0003435393710000022
And jth gas boiler
Figure BDA0003435393710000023
Is characterized by the following formula (2):
Figure BDA0003435393710000024
wherein the content of the first and second substances,
Figure BDA0003435393710000025
is the density of the methane and is,
Figure BDA0003435393710000026
and
Figure BDA0003435393710000027
molecular weights of carbon dioxide and methane, respectively;
CO produced in the coal burning process2Characterized by being shown as formula (3) and formula (4):
Figure BDA0003435393710000028
Figure BDA0003435393710000029
wherein the content of the first and second substances,
Figure BDA0003435393710000031
and
Figure BDA0003435393710000032
the carbon emission coefficients of the kth combined heat and power generation CHP unit are respectively,
Figure BDA0003435393710000033
are respectively the first stage S-CO2Carbon emission coefficient of the unit;
thereby removing CO generated in the whole combustion process2The emission is characterized by the formula (5):
Figure BDA0003435393710000034
step 2, constructing a carbon dioxide capture process model: the power consumption of the carbon capture device is expressed as shown in equation (6):
Figure BDA0003435393710000035
wherein α is the energy consumption rate of the carbon capture device; CO discharged into the atmosphere after carbon capture2The amount is expressed as shown in formula (7):
Figure BDA0003435393710000036
wherein eta isCCSThe operating efficiency of the carbon capture device;
step 3, collecting the collected CO2Directly utilized or sealed, respectively, as
Figure BDA0003435393710000037
And
Figure BDA0003435393710000038
the relationship between them is expressed as shown in equation (8):
Figure BDA0003435393710000039
wherein g is CO2Utilizing the ratio of the sealed storage;
part of the CO2 being utilized for the generation of natural gas CH by the electric gas-conversion plant P2G4The other part enters the supercritical CO2Power plant as supplementary working medium, wherein the supercritical CO2The power plant is an S-CO2 device; generating natural gas CH by the electric gas conversion device P2G4Comprises two stages, namely a water electrolysis process and a methanation reaction process, wherein the flow rate of hydrogen generated by water electrolysis
Figure BDA00034353937100000310
Power consumption of the electric gas transfer device P2G
Figure BDA00034353937100000311
Satisfies the relationship shown in formula (9):
Figure BDA00034353937100000312
wherein beta is the rate of hydrogen production by water electrolysis;
during the methanation reaction, the electricity is converted into gasCO consumed by plant P2G2Measurement of
Figure BDA00034353937100000313
And CH produced4Measurement of
Figure BDA0003435393710000041
The amount satisfies the relationship shown in the formula (10):
Figure BDA0003435393710000042
heat energy is released in the methanation process, and the released heat energy is used for supplying heat; assuming that the proportion of heat released for heat supply is ηP2G2HTotal thermal power for supplying heat to the electrical converter P2G
Figure BDA0003435393710000043
Expressed as shown in formula (11):
Figure BDA0003435393710000044
wherein gamma is the heat released by the unit methane generated by the methanation reaction;
during the operation of the first supercritical CO2 unit, the flow of the supplementary working medium
Figure BDA0003435393710000045
With first supercritical CO2Output power of the unit
Figure BDA0003435393710000046
Satisfies the relationship shown in formula (12):
Figure BDA0003435393710000047
wherein, delta is the supplementary working medium flow required by the unit electric power of the supercritical CO2 unit;
the electric gas conversion device P2GAnd supercritical CO2CO of power plant2One part of the source is provided by the carbon capture device, and the other part is purchased from the outside and expressed as the formula (13)
Figure BDA0003435393710000048
In the formula (I), the compound is shown in the specification,
Figure BDA0003435393710000049
CO purchased for the outside2The mass flow rate of the gas is controlled,
Figure BDA00034353937100000410
CO provided to the carbon capture device2Mass flow rate.
Step 4, calculating the operation cost of the comprehensive energy system: defining the operation cost of the integrated energy system as the purchase consumption of fuel comprising coal and gas turbines, and respectively representing the consumption during the operation period of the ith gas turbine and the jth gas boiler as shown in the formulas (14) and (15):
Figure BDA00034353937100000411
Figure BDA00034353937100000412
wherein the content of the first and second substances,
Figure BDA0003435393710000051
and
Figure BDA0003435393710000052
respectively representing the gas consumption of the ith gas turbine and the jth gas boiler,
Figure BDA0003435393710000053
a purchase price for methane;
in calculating the cost of purchasing methane, some of the methane produced by P2G is removed, and the consumption of methane produced by P2G is expressed as shown in equation (16):
Figure BDA0003435393710000054
for the first supercritical CO2The unit satisfies the relation shown in the formula (17) between the operation cost and the output power of the unit:
Figure BDA0003435393710000055
wherein a, b and c are running cost coefficients;
the fuel consumption of the cogeneration unit is expressed as shown in equation (18):
Figure BDA0003435393710000056
other costs during operation also include purchasing the CO2Is expressed by the following equation (19):
Figure BDA0003435393710000057
expressing the total operating cost of the integrated energy system as shown in equation (20):
Figure BDA0003435393710000058
where T is the total scheduled time, NT、NB、NC、NSRespectively gas turbine, gas boiler, cogeneration, supercritical CO2The number of units.
Step 5, calculating the pollutant treatment cost: limiting pollutants in coal and gas fired processes to the combined heat and power generation CHP and S-CO2Production of unitsRaw SO2With NOxThe processing costs are expressed by the following equations (21) and (22):
Figure BDA0003435393710000059
Figure BDA00034353937100000510
wherein the content of the first and second substances,
Figure BDA00034353937100000511
and
Figure BDA00034353937100000512
for combined heat and power CHP and S-CO, respectively2The pollutant treatment cost of the unit;
and (3) expressing the total pollutant treatment cost of the integrated energy system as shown in an equation (23):
Figure BDA0003435393710000061
step 6, calculating the penalty cost of wind abandonment and light abandonment of new energy: the penalty imposed by the curtailment section is expressed as shown in equation (24):
Figure BDA0003435393710000062
in the formula, NWTAnd NPVRespectively the number of wind power and photovoltaic units, KWTAnd KPVIs the electricity abandon penalty coefficient of wind power and photovoltaic,
Figure BDA0003435393710000063
and
Figure BDA0003435393710000064
respectively the predicted and actual power of the wind power,
Figure BDA0003435393710000065
and
Figure BDA0003435393710000066
respectively, the predicted and actual power of the photovoltaic;
and 7, scheduling and solving of the comprehensive energy system: the scheduling solution follows that under the constraint condition, the total cost of the comprehensive energy system is minimized by configuring the output of each unit and the comprehensive energy system; and (3) expressing the total cost of the comprehensive energy system as the sum of the operation cost, the pollutant treatment cost and the wind and light abandoning punishment cost, wherein the formula (25) is as follows:
C＝CD+CP+CR (25)；
the supply and demand balance between the power output and the load when the integrated energy system operates is represented by the formulas (26) and (27):
Figure BDA0003435393710000067
Figure BDA0003435393710000068
wherein, P is the electric power generated or consumed by each system, and H is the thermal power generated or consumed by each system;
Figure BDA0003435393710000069
and
Figure BDA00034353937100000610
electrical and thermal load requirements, respectively; TES and EB represent heat storage system and electric boiler separately;
according to a scheduling result, obtaining a wind abandon rate upsilon representing a new energy access rateWTAnd a waste light rate vPVAs shown in formulas (28) and (29): :
Figure BDA00034353937100000611
Figure BDA00034353937100000612
defining the energy utilization efficiency of the integrated energy system as a ratio between energy connected to the grid and the heat grid and total input energy, as shown in equation (30):
Figure BDA0003435393710000071
wherein, σ and pcoalRespectively the heat value and the unit price of the fire coal,
Figure BDA0003435393710000072
and
Figure BDA0003435393710000073
the energy utilization efficiency of wind power and photovoltaic power respectively;
CO actually discharged into the atmosphere2With net CO2Discharging
Figure BDA0003435393710000074
Expressed as formulas (31) and (32), respectively:
Figure BDA0003435393710000075
Figure BDA0003435393710000076
drawings
FIG. 1 is a flow diagram of a carbon cycle system according to the present invention;
FIG. 2 is a wind power prediction power diagram in an embodiment of the present invention;
FIG. 3 is a photovoltaic predicted power graph in an embodiment of the present invention;
FIG. 4 is a wind power grid-connected power diagram under different scenes in the embodiment of the invention;
FIG. 5 is a graph of grid-connected photovoltaic power in different scenarios according to an embodiment of the present invention;
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
FIG. 1 is a flow diagram of a carbon cycle system according to the present invention, as shown in FIG. 1, the carbon cycle system including CO2A generation subsystem, a carbon capture device, an electric gas conversion device, wherein, CO2The generating subsystem includes the generation of a channel with CH4Gas turbine GT and gas boiler GB using fuel, and heat and power cogeneration CHP and supercritical CO using coal as fuel2A power plant; carbon capture device for capturing CO2CO produced in the production subsystem2In particular from the group comprising gas turbine GT, gas boiler GB, combined heat and power CHP and supercritical CO2Separation and capture of CO from flue gases generated in power plants2The supercritical CO2Power plant using S-CO2Generating power by the unit; captured CO2A part enters into supercritical CO2As a supplementary working fluid in the power plant, a portion enters the electric gas conversion device P2G. The carbon circulating system is used in an integrated energy system, the integrated energy system comprises a power generation device, a heat supply device and an energy conversion device, the power generation device comprises a wind power or photovoltaic new energy power generation device, a gas turbine, a gas boiler, cogeneration and supercritical CO2A power plant; when the output of the new energy power generation device is high, the electric gas conversion device P2G in the carbon circulation system uses surplus electric power to convert part of CO2Reduction to CH4And sent to the gas turbine GT or gas boiler GB as fuel.
Examples
The integrated energy system in this embodiment includes power generation, heat supply, and various forms of energy conversion devices. For power generation and heating devices, installed capacities of wind power, photovoltaic, gas turbine, gas boiler, cogeneration, and supercritical CO2 are 750MW, 400MW, 500MW, 50MW, 200MW, and 300MW, respectively. The proportion of renewable energy power generation reaches 52.3%. For coal and gas fired units, the minimum output power is 50% of the maximum output power. For the energy conversion device, the maximum power of the electric conversion gas and the electric boiler is 100MW and 50MW respectively. The maximum energy capacity and power of the heat storage device are 120MWh and 50MW, respectively. The efficiencies of the gas turbine, the gas boiler, the carbon capture, the electricity-to-gas heat supply, the electric boiler, the wind power and the photovoltaic are respectively 34%, 82%, 90%, 82%, 32% and 12%.
First, the integrated energy system operating cost is calculated. Wherein the purchase unit price of methane is 2.65 yuan/m3Density of 0.0007174t/m3，CO2The purchase cost of (A) is 300 yuan/t, S-CO2The running cost coefficients of the unit are 0.02585 yuan MW respectively-2103.57 yuan/MW, 10,210.56 yuan. The operation cost coefficients of the CHP unit are 0.2415 yuan MW respectively-2101.5 yuan/MW, 2650 yuan, 0.21 yuan/MW-229.4 yuan/MW, 0.217 yuan. And step two, calculating the pollutant treatment cost. Wherein, S-CO2The pollutant treating cost coefficient of the unit is 0.00238 yuan MW-29.55M/MW, 941.07M. The operation cost coefficients of the CHP unit are 0.02226 yuan MW respectively-29.35 yuan/MW, 244.24 yuan, 0.019 yuan MW-22.71 yuan/MW, 0.02 yuan. And step three, calculating the punishment cost of wind abandoning and light abandoning of the new energy. And the electricity abandonment penalty coefficients of the wind power and the photovoltaic are both 150 yuan/MW.
The predicted power of wind power and photovoltaic power in this embodiment is shown in fig. 2 and 3. According to the parameter setting in the above embodiment, the grid-connected power of wind power and photovoltaic power before and after the system is added into the carbon circulation system can be obtained, as shown in fig. 4 and 5. According to the calculation of the step four in the invention content, the air rejection rates before and after the carbon circulating system is added are respectively 3.1% and 0, and the light rejection rates are respectively 10.8% and 0.
When calculating the energy utilization efficiency, the heating value and the unit price of the fire coal are 25330kJ/kg and 500 yuan/t respectively. The calculation can obtain: before and after the carbon circulation system is added, the energy utilization efficiency of the comprehensive energy system is respectively 34.5 percent and 35.5 percent, and is improved by 1 percent.
In calculating the actual CO emitted into the atmosphere2With net CO2When the carbon capture device is discharged, the energy consumption rate of the carbon capture device is 0.15MWh/t, the ratio of carbon utilization to sequestration is 0.075g, the rate of hydrogen production by water electrolysis is 0.025t/MWh, the heat released by unit methane generated by methanation reaction is 2.865MWh/t, and the supercritical CO is used for generating hydrogen2The flow rate of the supplementary working medium required by unit electric power of the unit is 0.393t/MWh, and the supercritical CO2The carbon emission coefficients of the units are respectively 0.0001 Yuan.MW-20.4278 yuan/MW, 42.17 yuan. The carbon emission coefficients of the CHP unit are respectively 0.001 yuan MW-20.4192 yuan/MW, 10.95 yuan, 0.00087 yuan MW-20.1214 yuan/MW, 0.0009 yuan. The scheduling results show that at each moment, the CO actually discharged into the atmosphere before and after the addition of the carbon circulation system2With net CO2The emissions are shown in the table below:
Figure BDA0003435393710000091
Figure BDA0003435393710000101
from the results in the table above, it is calculated that: the actual carbon emission and the net carbon emission of the system before the carbon cycle is added are equal to 12392t, and the carbon emission and the net carbon emission after the carbon cycle is added are 1309t and-155.6 t respectively.
According to the calculation results, after the carbon circulation system is added, the wind power and photovoltaic power rejection rate of the comprehensive energy system is respectively reduced by 3.1% and 10.8%, the energy utilization efficiency of the system is improved by 1%, the actual carbon emission and the net carbon emission reach 1309t and-155.6 t, and are respectively reduced by 89.4% and 101.3%.
In conclusion, the invention provides a structure of a carbon circulating system and an application method thereof in a comprehensive energy system, and promotes the access rate of new energy, the utilization efficiency of energy and carbon emission reduction.
The foregoing detailed description has shown and described the principles, broad features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (2)

1. A carbon cycle system comprising CO2A generation subsystem, a carbon capture device, an electric gas conversion device, wherein the CO2The generating subsystem includes the generation of a channel with CH4Gas turbine GT and gas boiler GB using fuel, and heat and power cogeneration CHP and supercritical CO using coal as fuel2A power plant; the carbon capture device captures CO2CO produced in the production subsystem2In particular from the group comprising gas turbine GT, gas boiler GB, combined heat and power CHP and supercritical CO2Separation and capture of CO from flue gases generated in power plants2Said supercritical CO2Power plant using S-CO2Generating power by the unit; captured CO2A part enters into supercritical CO2A part of the working fluid used as a supplementary working fluid in the power plant enters an electric gas conversion device P2G; the carbon circulating system is used in an integrated energy system which comprises a power generation device, a heat supply device and an energy conversion device, wherein the power generation device comprises a wind power or photovoltaic new energy power generation device, a gas turbine, a gas boiler, cogeneration and supercritical CO2A power plant; when the output of the new energy power generation device is high, the electric gas conversion device P2G in the carbon circulation system uses surplus electric power to convert part of CO2Reduction to CH4And sent to the gas turbine GT or gas boiler GB as fuel.
2. A method of using the carbon cycler system of claim 1 for optimal scheduling of an integrated energy system, comprising the steps of:
step 1, establishing CO2Generating a process model: CO generated in the power generation process2The sources of (a) are designated natural gas and coal; for a natural gas power generation process, the output of a gas turbine and a gas boiler is characterized as shown in equation (1):
Figure FDA0003435393700000021
wherein P and H are respectively the electric power and thermal power output of the unit, n is the electric or thermal production efficiency, Q is the consumption rate of natural gas, HNGIs the heat value of natural gas. The superscripts GT and GB represent a gas turbine and a gas boiler, respectively, and the subscripts i and j represent serial numbers of the gas turbine and the gas boiler, respectively;
will the ith gas turbine
Figure FDA0003435393700000022
And jth gas boiler
Figure FDA0003435393700000023
Is characterized by the following formula (2):
Figure FDA0003435393700000024
wherein the content of the first and second substances,
Figure FDA0003435393700000025
is the density of the methane and is,
Figure FDA0003435393700000026
and
Figure FDA0003435393700000027
molecular weights of carbon dioxide and methane, respectively;
CO produced in the coal burning process2Characterized by being shown as formula (3) and formula (4):
Figure FDA0003435393700000028
Figure FDA0003435393700000029
wherein the content of the first and second substances,
Figure FDA00034353937000000210
and
Figure FDA00034353937000000211
the carbon emission coefficients of the kth combined heat and power generation CHP unit are respectively,
Figure FDA00034353937000000212
are respectively the first stage S-CO2Carbon emission coefficient of the unit;
thereby removing CO generated in the whole combustion process2The emission is characterized by the formula (5):
Figure FDA00034353937000000213
step 2, constructing a carbon dioxide capture process model: the power consumption of the carbon capture device is expressed as shown in equation (6):
Figure FDA00034353937000000214
wherein α is the energy consumption rate of the carbon capture system; CO discharged into the atmosphere after carbon capture2The amount is expressed as shown in formula (7):
Figure FDA0003435393700000031
wherein the content of the first and second substances,CCSthe operating efficiency of the carbon capture device;
step 3, collecting the collected CO2Directly utilized or sealed, respectively, as
Figure FDA0003435393700000032
And
Figure FDA0003435393700000033
the relationship between them is expressed as shown in equation (8):
Figure FDA0003435393700000034
wherein g is CO2Utilizing the ratio of the sealed storage;
part of the CO2 being utilized for the generation of natural gas CH by the electric gas-conversion plant P2G4The other part enters the supercritical CO2Power plant as supplementary working medium, wherein the supercritical CO2The power plant is an S-CO2 device; generating natural gas CH by the electric gas conversion device P2G4Comprises two stages, namely a water electrolysis process and a methanation reaction process, wherein the flow rate of hydrogen generated by water electrolysis
Figure FDA0003435393700000035
Power consumption P of the electric gas transfer device P2Gt P2GSatisfies the relationship shown in formula (9):
Figure FDA00034353937000000311
wherein beta is the rate of hydrogen production by water electrolysis;
the amount of CO2 consumed by the electric gas conversion plant P2G during the methanation reaction
Figure FDA0003435393700000036
And CH produced4Measurement of
Figure FDA0003435393700000037
The amount satisfies the relationship shown in the formula (10):
Figure FDA0003435393700000038
heat energy is released in the methanation process, and the released heat energy is used for supplying heat; assuming that the proportion of heat released for heat supply is ηP2G2HTotal thermal power for supplying heat to the electrical converter P2G
Figure FDA0003435393700000039
Expressed as shown in formula (11):
Figure FDA00034353937000000310
wherein gamma is the heat released by the unit methane generated by the methanation reaction;
during the operation of the first supercritical CO2 unit, the flow of the supplementary working medium
Figure FDA0003435393700000041
With first supercritical CO2Output power of the unit
Figure FDA0003435393700000042
Satisfies the relationship shown in formula (12):
Figure FDA0003435393700000043
wherein, delta is the supplementary working medium flow required by the unit electric power of the supercritical CO2 unit;
the electric gas conversion device P2G and supercritical CO2CO of power plant2SourceOne part is supplied from the carbon capture device, and the other part is purchased from the outside and expressed as the formula (13)
Figure FDA0003435393700000044
In the formula (I), the compound is shown in the specification,
Figure FDA0003435393700000045
CO purchased for the outside2The mass flow rate of the gas is controlled,
Figure FDA0003435393700000046
CO provided to the carbon capture device2Mass flow rate.
Step 4, calculating the operation cost of the comprehensive energy system: defining the operation cost of the integrated energy system as the purchase consumption of fuel comprising coal and gas turbines, and respectively representing the consumption during the operation period of the ith gas turbine and the jth gas boiler as shown in the formulas (14) and (15):
Figure FDA0003435393700000047
Figure FDA0003435393700000048
wherein the content of the first and second substances,
Figure FDA0003435393700000049
and
Figure FDA00034353937000000410
respectively representing the gas consumption of the ith gas turbine and the jth gas boiler,
Figure FDA00034353937000000411
a purchase price for methane;
in calculating the cost of purchasing methane, some of the methane produced by P2G is removed, and the consumption of methane produced by P2G is expressed as shown in equation (16):
Figure FDA00034353937000000412
for the first supercritical CO2The unit satisfies the relation shown in the formula (17) between the operation cost and the output power of the unit:
Figure FDA0003435393700000051
wherein a, b and c are running cost coefficients;
the fuel consumption of the cogeneration unit is expressed as shown in equation (18):
Figure FDA0003435393700000052
other costs during operation also include purchasing the CO2Is expressed by the following equation (19):
Figure FDA0003435393700000053
expressing the total operating cost of the integrated energy system as shown in equation (20):
Figure FDA0003435393700000054
where T is the total scheduled time, NT、NB、NC、NSRespectively gas turbine, gas boiler, cogeneration, supercritical CO2The number of units.
Step 5Calculating the pollutant treatment cost: limiting pollutants in coal and gas fired processes to the combined heat and power generation CHP and S-CO2SO produced by the unit2With NOxThe processing costs are expressed by the following equations (21) and (22):
Figure FDA0003435393700000055
Figure FDA0003435393700000056
wherein the content of the first and second substances,
Figure FDA0003435393700000057
and
Figure FDA0003435393700000058
for combined heat and power CHP and S-CO, respectively2The pollutant treatment cost of the unit;
and (3) expressing the total pollutant treatment cost of the integrated energy system as shown in an equation (23):
Figure FDA0003435393700000061
step 6, calculating the penalty cost of wind abandonment and light abandonment of new energy: the penalty imposed by the curtailment section is expressed as shown in equation (24):
Figure FDA0003435393700000062
in the formula, NWTAnd NPVRespectively the number of wind power and photovoltaic units, KWTAnd KPVIs the electricity abandon penalty coefficient of wind power and photovoltaic,
Figure FDA0003435393700000063
and
Figure FDA0003435393700000064
respectively the predicted and actual power of the wind power,
Figure FDA0003435393700000065
and
Figure FDA0003435393700000066
respectively, the predicted and actual power of the photovoltaic;
and 7, scheduling and solving of the comprehensive energy system: the scheduling solution follows that under the constraint condition, the total cost of the comprehensive energy system is minimized by configuring the output of each unit and the comprehensive energy system; and (3) expressing the total cost of the comprehensive energy system as the sum of the operation cost, the pollutant treatment cost and the wind and light abandoning punishment cost, wherein the formula (25) is as follows:
C＝CD+CP+CR (25)；
the supply and demand balance between the power output and the load when the integrated energy system operates is represented by the formulas (26) and (27):
Figure FDA0003435393700000067
Figure FDA0003435393700000068
wherein, P is the electric power generated or consumed by each system, and H is the thermal power generated or consumed by each system; pt DAnd
Figure FDA0003435393700000069
electrical and thermal load requirements, respectively; TES and EB represent heat storage system and electric boiler separately;
according to a scheduling result, obtaining a wind abandon rate upsilon representing a new energy access rateWTAnd a waste light rate vPVAs shown in formulas (28) and (29): :
Figure FDA00034353937000000610
Figure FDA0003435393700000071
defining the energy utilization efficiency of the integrated energy system as a ratio between energy connected to the grid and the heat grid and total input energy, as shown in equation (30):
Figure FDA0003435393700000072
wherein, σ and pcoalRespectively the heat value and the unit price of the fire coal,
Figure FDA0003435393700000073
and
Figure FDA0003435393700000074
the energy utilization efficiency of wind power and photovoltaic power respectively;
CO actually discharged into the atmosphere2With net CO2Discharging
Figure FDA0003435393700000075
Expressed as formulas (31) and (32), respectively:
Figure FDA0003435393700000076
Figure FDA0003435393700000077
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116681270A (en) * 2023-08-04 2023-09-01 山东理工大学 Optimal scheduling method of virtual power plant under flexible carbon emission mechanism
CN117148805A (en) * 2023-10-30 2023-12-01 国网江苏省电力有限公司南通供电分公司 Multi-scene adaptive power plant equipment early warning method and system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116681270A (en) * 2023-08-04 2023-09-01 山东理工大学 Optimal scheduling method of virtual power plant under flexible carbon emission mechanism
CN117148805A (en) * 2023-10-30 2023-12-01 国网江苏省电力有限公司南通供电分公司 Multi-scene adaptive power plant equipment early warning method and system
CN117148805B (en) * 2023-10-30 2024-01-12 国网江苏省电力有限公司南通供电分公司 Multi-scene adaptive power plant equipment early warning method and system

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