CN112152199A - Energy efficiency optimization method and system of multi-energy complementary comprehensive energy system - Google Patents
Energy efficiency optimization method and system of multi-energy complementary comprehensive energy system Download PDFInfo
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Abstract
The utility model provides an energy efficiency optimization method and system of a multi-energy complementary comprehensive energy system, comprising the following steps: determining the input and the output of a comprehensive energy system to be optimized, wherein the boundary comprises an air supply output quantity which comprises the air supply output quantity of electric energy conversion which does not reach a grid-connected condition in the comprehensive energy system; acquiring operation data and system parameters of the comprehensive energy system according to the determined input and output; calculating the energy efficiency of the comprehensive energy system according to the acquired operation data; and carrying out quantitative evaluation on the comprehensive energy system and carrying out operation optimization scheduling according to the energy efficiency of the comprehensive energy system obtained by calculation. According to the method, the natural gas output generated by the P2G technology participates in energy efficiency calculation of the comprehensive energy system, the electric energy which cannot reach the grid-connected condition is utilized, and the comprehensive energy utilization efficiency of the system is effectively improved.
Description
Technical Field
The disclosure relates to the technical field of comprehensive energy correlation, in particular to an energy efficiency optimization method and system of a multi-energy complementary comprehensive energy system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
With the rapid development of social economy in China, the total energy demand is increased rapidly, and the contradiction between energy supply and demand is increasingly prominent. In recent years, energy problems gradually become a hotspot discussed in all circles of society, energy internet comprehensive energy systems and other concepts are provided, a brand new view is provided for energy analysis, and the convergence and innovation among all fields and all disciplines are promoted.
The comprehensive energy system is an important physical carrier of an energy internet, comprises a plurality of energy networks such as electricity, heat and cold, strong coupling exists among different energy networks, interconnection and mutual assistance of different kinds of energy and cascade utilization of the energy can be realized by applying various advanced energy production and conversion technologies, and the utilization rate of the comprehensive energy is improved. Compared with each energy individual combat, the comprehensive energy system meets the individual demands of diversification of users in the new era, but the complexity of the comprehensive energy system increases the utilization efficiency of energy and the utilization efficiency of the energy cannot be directly known.
Disclosure of Invention
In order to solve the above problems, the present disclosure provides an energy efficiency optimization method and system for a multi-energy complementary comprehensive energy system, which can achieve energy efficiency optimization of the comprehensive energy system or an accurate energy efficiency index.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
one or more embodiments provide a method for energy efficiency optimization of a multi-energy complementary integrated energy system, including the steps of:
determining the input and the output of a comprehensive energy system to be optimized, wherein the output comprises an air supply output quantity which comprises the air supply output quantity of electric energy conversion which does not reach a grid-connected condition in the comprehensive energy system;
acquiring operation data and system parameters of the comprehensive energy system according to the determined boundary;
calculating the energy efficiency of the comprehensive energy system according to the acquired operation data;
and carrying out quantitative evaluation on the comprehensive energy system and carrying out operation optimization scheduling according to the energy efficiency of the comprehensive energy system obtained by calculation.
One or more embodiments provide an energy efficiency optimization system of a multi-energy complementary comprehensive energy system, which comprises a plurality of energy supply devices, an optimization control unit and data acquisition devices arranged at the input end and the output end of each energy supply device; the optimization control unit adopts the energy efficiency optimization method of the multi-energy complementary comprehensive energy system, and carries out quantitative evaluation on the energy efficiency of the comprehensive energy system or realizes regulation and control on the energy supply device according to the calculation result.
One or more embodiments provide an energy efficiency optimization system of a multi-energy complementary integrated energy system, including:
a setting module: the system comprises a plurality of integrated energy systems, a plurality of sensors and a controller, wherein the integrated energy systems are configured to determine input and output of the integrated energy systems to be optimized, the output comprises gas supply output quantity, and the gas supply output quantity comprises gas supply output quantity of electric energy conversion which does not reach grid-connected conditions in the integrated energy systems;
a data acquisition module: configured for obtaining operational data and system parameters of the integrated energy system based on the determined inputs and outputs;
a calculation module: configured for calculating an energy efficiency of the integrated energy system from the acquired operational data;
a control output module: and the system is configured for carrying out quantitative evaluation on the integrated energy system and carrying out operation optimization scheduling according to the energy efficiency of the integrated energy system obtained by calculation.
Compared with the prior art, the beneficial effect of this disclosure is:
(1) according to the method, the natural gas output generated by the P2G technology participates in energy efficiency calculation of the comprehensive energy system, the electric energy which cannot reach the grid-connected condition is utilized, and the comprehensive energy utilization efficiency of the system is effectively improved.
(2) According to the optimization method, the effect obtained by each energy-saving measure can be indirectly reflected by obtaining the accurate energy efficiency of the comprehensive energy system, the quantitative evaluation on energy conservation and consumption reduction can be carried out, and the quantitative evaluation of the comprehensive energy system is realized; the energy efficiency weak link of the comprehensive energy system can be found, energy-saving technology transformation or energy-saving optimized scheduling is carried out, and the method has very important significance for improving the energy utilization efficiency and the economic benefit of the system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure.
FIG. 1 is a flow chart of a method of example 1 of the present disclosure;
fig. 2 is a system block diagram of embodiment 2 of the present disclosure;
fig. 3 is a system block diagram of embodiment 3 of the present disclosure;
the specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments in the present disclosure may be combined with each other. The embodiments will be described in detail below with reference to the accompanying drawings.
Example 1
In one or more embodiments, as shown in fig. 1, a method for optimizing energy efficiency of a multi-energy complementary integrated energy system includes the following steps:
step 2, acquiring operation data and system parameters of the comprehensive energy system according to the determined input and output;
step 3, determining an energy efficiency calculation formula of the comprehensive energy, and calculating the energy efficiency of the comprehensive energy system according to the acquired operation data;
and 4, carrying out quantitative evaluation on the comprehensive energy system and carrying out operation optimization scheduling according to the energy efficiency of the comprehensive energy system obtained by calculation.
Further, the operation optimization scheduling comprises mutual conversion control among all energy sources, control of different energy source supply time and different energy source supply quantity, optimization adjustment of the output of all energy source equipment is carried out on the system, and the matching degree of the comprehensive energy source system is improved, so that the energy utilization rate is improved.
In the embodiment, the boundary of the comprehensive energy system contains electric energy which cannot meet the grid-connected condition, so that the accuracy of energy efficiency calculation of the comprehensive energy system can be improved, and the energy utilization rate of the comprehensive energy system can be improved by adjusting according to the calculation result.
The effects obtained by various energy-saving measures can be indirectly reflected through the energy efficiency of the comprehensive energy system, and the effects of energy conservation and consumption reduction are tested; the method can be combined with an evaluation system of the comprehensive energy system to be used as an evaluation index to realize quantitative evaluation of the comprehensive energy system; the energy efficiency weak link of the comprehensive energy system can be found, the system is guided to carry out energy-saving technical transformation or energy-saving optimized scheduling, and the method has very important significance for improving the energy utilization efficiency and the economic benefit of the system.
In this embodiment, the integrated energy system includes input of electric energy, natural gas, a heating power pipe network, steam, solar energy, and wind energy, and output of power generation, cooling, heating, and gas supply.
In step 1, the boundary of the integrated energy system includes the input and output of the integrated energy system, and optionally, the input of the integrated energy system includes the input of power supply, the input of natural gas, the input of a heating power pipe network, the input of steam, the input of solar energy and the input of wind energy.
Optionally, the output of the integrated energy system includes, in addition to the air supply output, a power supply output, a cooling output, and a heating output.
As a further improvement, the air supply output quantity in the boundary in step S1 is collected from the electric energy that does not meet the grid-connected standard in the integrated energy system, and optionally, the electric energy may be converted into gas by using a P2G method.
The P2G method is specifically to set P2G electrolysis equipment, and the specific method is as follows: the water is electrolyzed to generate hydrogen, and then water and CO2 in the atmosphere are utilized to produce methane through methanation reaction, and the produced methane can be liquefied and stored for users to use.
Specifically, the reaction process is as follows:
in some embodiments, in step 2, the operational data comprises: the comprehensive energy system comprises a natural gas supply quantity, an electric energy supply quantity, a hot water supply quantity, a steam supply quantity, a solar energy supply quantity and a wind energy supply quantity at an input end of the comprehensive energy system, and a power supply quantity, a cooling supply quantity, a heating supply quantity and an air supply quantity at an output end of the comprehensive energy system.
Realizable, the input and the output of waiting to calculate comprehensive energy system all are provided with the strapping table and are used for acquireing above-mentioned data, and the strapping table includes cold strapping table, heat meter, electric meter, gas strapping table, anemograph and solar energy illuminometer at least.
Through wait to calculate cold strapping table, heat meter, electric meter, gas gauge table, anemometer and the solar energy illuminometer of comprehensive energy system's output and input, can acquire wait to calculate comprehensive energy system's energy input and output quantity.
Optionally, the system parameters include: the method comprises the steps of calculating the low heating value of the electric energy in the running stage of the comprehensive energy system to be calculated, the density and specific heat capacity of water at different temperatures, the low heating value of natural gas, the energy conversion value of steam, the radiation temperature of the sun, the wind speed and the sectional area perpendicular to the wind speed.
Furthermore, energy sources are converted into primary energy sources by using low heating values of various forms of energy sources, and an energy efficiency calculation formula of the comprehensive energy sources is established.
Specifically, in step 3, an energy efficiency calculation formula of the comprehensive energy source is determined as follows:
wherein E isocThe conversion value of standard coal for outputting electric energy; qoccIs an outputThe standard coal conversion value of the cold quantity; qochThe conversion value of the standard coal for outputting heat is obtained; focThe standard coal conversion value of the output natural gas is obtained; eicThe conversion value of the standard coal of the input electric energy is obtained; ficThe conversion value of standard coal of input natural gas; qicInputting a standard coal conversion value of heat for a hot water pipe network; gicThe conversion value of the standard coal for inputting steam energy; t isicThe conversion value of the standard coal for inputting solar energy; y isicThe conversion value of the standard coal for inputting wind energy is obtained.
In the embodiment, different energy sources are converted into a unified standard, and the energy efficiency calculation of the comprehensive energy system to be calculated is realized by using the primary energy conversion value of the comprehensive energy system to be calculated, so that the matching degree of the comprehensive energy system can be optimized.
Conversion value E of standard coal for outputting electric energyocThe calculation formula of (2) may be:
wherein E isocThe unit is kJ; lambda [ alpha ]eThe low heating value of the electric energy is constant; w is net output electric quantity of the combined supply system, and the unit is kWh; lambda [ alpha ]cThe lower calorific value of 1kg standard coal is constant and can be 29.3x103KJ。
Standard coal conversion value Q of output cold quantityoccThe calculation formula of (2) may be:
wherein Q isoccThe unit is kJ; m is the mass of the output cold water, the unit is kg, and the calculation is carried out according to m ═ rho V; rho is the cold water density; v is cold water flow; c. CpIs the specific heat capacity of water; t isoutThe temperature of the water outlet of the water chilling unit; t isinThe temperature of a water return port of the water chilling unit is set; lambda [ alpha ]cThe lower calorific value of 1kg of standard coal.
Conversion value Q of standard coal for outputting heatochIs calculated byThe method can be as follows:
wherein Q isochThe unit is kJ; m is the mass of the output hot water and is calculated according to the m ═ rho V; rho is the hot water density; v is the hot water flow rate, and the unit is m3；cpIs the specific heat capacity of water; t is0Is ambient temperature in K; t isoutIs the temperature of the output hot water; t isinThe temperature of the return water of the hot water is; lambda [ alpha ]cThe lower calorific value of 1kg of standard coal.
Standard coal conversion value F of output natural gasocThe calculation formula of (2) may be:
wherein V is the volume of natural gas produced by the energy system, HgIs the low calorific value, lambda, of natural gascThe lower calorific value of 1kg of standard coal.
Conversion value E of standard coal for input of electric energyicThe calculation formula of (2) may be:
wherein E isicThe unit is kJ; lambda [ alpha ]eThe low heating value is the electric energy; w is net input electric quantity of the combined supply system, and the unit is kWh; lambda [ alpha ]cThe lower calorific value of 1kg of standard coal.
Standard coal conversion value F of input natural gasicThe calculation formula of (2) may be:
wherein V is the volume of natural gas consumed by the comprehensive energy system, and HgIs the low calorific value of natural gas，λcThe lower calorific value of 1kg of standard coal.
Standard coal conversion value Q of hot water pipe network input heaticThe calculation formula of (2) may be:
wherein Q isicThe unit is kJ; m is the mass of hot water input by a heating power pipe network, the unit is kg, and calculation is carried out according to m ═ rho V; rho is the hot water density; v is the hot water flow, and can be measured by an arranged flowmeter; c. CpIs the specific heat capacity of water; t isoutThe temperature of a water inlet of a heat distribution pipe network; t isinThe temperature of a water return port of a heating power pipe network is measured; lambda [ alpha ]cThe lower calorific value of 1kg of standard coal.
Conversion value G of standard coal for inputting steam energyicThe calculation formula of (2) may be:
wherein q ism1、qm2Respectively measuring the steam mass flow rate (kg/s) before and after the temperature and pressure change process (or the inlet and the outlet of the heat exchange device); h'1、h”2The specific enthalpy of the steam before and after the temperature and pressure change of the steam (or at the inlet and the outlet of a certain device or equipment), namely the steam energy conversion value; Δ t is the steam circulation time; lambda [ alpha ]cThe lower calorific value of 1kg of standard coal.
Converted value T of standard coal for inputting solar energyicThe calculation formula of (2) may be:
wherein G represents the solar radiation illumination intensity in W/m2；AcellRepresents the area of the solar cell in m2；λcLow level heating of 1kg standard coalThe value is obtained.
Conversion value Y of standard coal for inputting wind energyicThe calculation formula of (2) may be:
wherein ρ is the air density; v is wind speed, the unit is m/s, and the wind speed can be measured through an anemometer; f is the cross-sectional area perpendicular to the wind speed, in m2(ii) a Delta t is the wind flow time in units of s; lambda [ alpha ]eThe low heating value is the electric energy; lambda [ alpha ]cThe lower calorific value of 1kg of standard coal.
The optimization method in the embodiment starts from the essential characteristics of a multi-energy complementary comprehensive energy system, calculates the low-order heating value of various energy forms on the basis of the first law of thermodynamics, converts the low-order heating value into primary energy, realizes energy efficiency calculation of the comprehensive energy system by comprehensively considering the input of electric energy, natural gas, a heating pipe network, steam, solar energy and wind energy, the output of power generation, cooling supply, heat supply and gas supply and the utilization of electric energy generated in the comprehensive energy system and not reaching the grid-connected condition, and can realize the optimization of the matching degree of the comprehensive energy system.
Example 2
The embodiment provides an energy efficiency optimization system of a multi-energy complementary comprehensive energy system, which includes a plurality of energy supply devices, an optimization control unit, and data acquisition devices arranged at the input end and the output end of each energy supply device, wherein the optimization control unit performs quantitative evaluation on the energy efficiency of the comprehensive energy system or realizes regulation and control of the energy supply devices according to a calculation result by using the energy efficiency optimization method of the multi-energy complementary comprehensive energy system described in embodiment 1.
Data acquisition device can adopt the strapping table, the strapping table sets up the input and the output of waiting to calculate comprehensive energy system for acquire comprehensive energy system's operating data, the strapping table includes cold strapping table, heat meter, electric meter, gas strapping table, anemograph and solar energy illuminometer at least.
The configurable data acquisition time interval of the data acquisition device can be set, specifically set at the maximum sampling interval time of the meters of each input/output port of each energy supply device, and optionally, the default value of the time interval can be 10 min.
The energy supply device can comprise an energy supply device for supplying electric energy, natural gas, a heating power pipe network, steam, solar energy and wind energy, the electric energy supply device can be a thermal power generation device, a solar power generation device and a wind power generation device, the steam supply device can be a steam boiler, and the natural gas supply device can be a connecting gas supply pipeline and the like.
As a further improvement, P2G electrolysis equipment is arranged at the output end of the electric energy supply device, and gas generated by the electrolysis equipment is liquefied and stored, so that electric energy which does not reach a grid-connected stake can be collected and utilized, natural gas is generated by utilizing the electric energy, the supply form of the energy is converted, and the energy utilization efficiency is improved.
Example 3
The embodiment provides an energy efficiency optimization system of a multi-energy complementary comprehensive energy system, which includes:
a setting module: the system comprises a plurality of integrated energy systems, a plurality of sensors and a controller, wherein the integrated energy systems are configured to determine input and output of the integrated energy systems to be optimized, the output comprises gas supply output quantity, and the gas supply output quantity comprises gas supply output quantity of electric energy conversion which does not reach grid-connected conditions in the integrated energy systems;
a data acquisition module: configured for obtaining operational data and system parameters of the integrated energy system based on the determined inputs and outputs;
a calculation module: configured for calculating an energy efficiency of the integrated energy system from the acquired operational data;
a control output module: and the system is configured for carrying out quantitative evaluation on the integrated energy system and carrying out operation optimization scheduling according to the energy efficiency of the integrated energy system obtained by calculation.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. The energy efficiency optimization method of the multi-energy complementary comprehensive energy system is characterized by comprising the following steps of:
determining the input and the output of a comprehensive energy system to be optimized, wherein the output comprises an air supply output quantity which comprises the air supply output quantity of electric energy conversion which does not reach a grid-connected condition in the comprehensive energy system;
acquiring operation data and system parameters of the comprehensive energy system according to the determined boundary;
calculating the energy efficiency of the comprehensive energy system according to the acquired operation data;
and carrying out quantitative evaluation on the comprehensive energy system and carrying out operation optimization scheduling according to the energy efficiency of the comprehensive energy system obtained by calculation.
2. The energy efficiency optimization method of the multi-energy complementary comprehensive energy system according to claim 1, characterized in that: the operation optimization scheduling comprises the mutual conversion control among all energy sources, the control of different energy source supply time and different energy source supply quantity, and the optimization adjustment of the output of all the energy sources.
3. The energy efficiency optimization method of the multi-energy complementary comprehensive energy system according to claim 1, characterized in that: the method of P2G is used to convert electric energy into gas supply output.
4. The energy efficiency optimization method of the multi-energy complementary comprehensive energy system according to claim 3, characterized in that: the method for converting the electric energy into the gas supply output quantity of the fuel gas by adopting the P2G method comprises the following specific steps: a P2G electrolysis apparatus is provided to electrolyze water to generate hydrogen, and methane is produced by methanation using water and carbon dioxide in the atmosphere.
5. The energy efficiency optimization method of the multi-energy complementary comprehensive energy system according to claim 1, characterized in that: the operational data includes: the comprehensive energy system comprises a natural gas supply quantity, an electric energy supply quantity, a hot water supply quantity, a steam supply quantity, a solar energy supply quantity and a wind energy supply quantity at an input end of the comprehensive energy system, and a power supply quantity, a cooling supply quantity, a heating supply quantity and an air supply quantity at an output end of the comprehensive energy system.
6. The energy efficiency optimization method of the multi-energy complementary comprehensive energy system according to claim 1, characterized in that: the input of the comprehensive energy system comprises power supply input quantity, natural gas input quantity, heating power pipe network input quantity, steam input quantity, solar energy input quantity or/and wind energy input quantity;
and/or the output of the comprehensive energy system also comprises power supply output quantity, cold supply output quantity or/and heat supply output quantity.
7. The energy efficiency optimization method of the multi-energy complementary comprehensive energy system according to claim 1, characterized in that: the energy efficiency calculation formula is established by the following method: the low heating value of various forms of energy sources is utilized to convert the energy sources into primary energy sources.
8. An energy efficiency optimization system of a multi-energy complementary comprehensive energy system is characterized in that: the system comprises a plurality of energy supply devices, an optimization control unit and data acquisition devices arranged at the input end and the output end of each energy supply device; the optimization control unit adopts the energy efficiency optimization method of the multi-energy complementary comprehensive energy system as claimed in any one of claims 1 to 7, and carries out quantitative evaluation on the energy efficiency of the comprehensive energy system or realizes regulation and control of the energy supply device according to the calculation result.
9. The energy efficiency optimization system of the multi-energy complementary comprehensive energy system according to claim 8, wherein: the data acquisition device adopts gauges, including a cold gauge, a heat gauge, an electric gauge, a gas gauge, an anemometer and a solar illuminometer;
or the energy supply device comprises an energy supply device for supplying electric energy, natural gas, a heating power pipe network, steam, solar energy and wind energy;
or the electric energy output end which is generated by the renewable energy source and does not reach the grid-connected standard is connected with the P2G electrolysis equipment, and the gas generated by the electrolysis equipment is converted into liquid under the condition of the acid.
10. An energy efficiency optimization system of a multi-energy complementary comprehensive energy system is characterized by comprising:
a setting module: the system comprises a plurality of integrated energy systems, a plurality of sensors and a controller, wherein the integrated energy systems are configured to determine input and output of the integrated energy systems to be optimized, the output comprises gas supply output quantity, and the gas supply output quantity comprises gas supply output quantity of electric energy conversion which does not reach grid-connected conditions in the integrated energy systems;
a data acquisition module: configured for obtaining operational data and system parameters of the integrated energy system based on the determined inputs and outputs;
a calculation module: configured for calculating an energy efficiency of the integrated energy system from the acquired operational data;
a control output module: and the system is configured for carrying out quantitative evaluation on the integrated energy system and carrying out operation optimization scheduling according to the energy efficiency of the integrated energy system obtained by calculation.
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