CN110852607A - Energy efficiency assessment method of comprehensive energy system - Google Patents
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Abstract
The invention discloses an energy efficiency evaluation method of a comprehensive energy system, which comprises the following steps: determining the boundary of the comprehensive energy system to be evaluated; determining a calculation formula of the energy step utilization rate of the comprehensive energy system to be evaluated; determining the weight of the energy utilization rate of each energy in the comprehensive energy system to be evaluated; determining energy efficiency evaluation parameters of the comprehensive energy system to be evaluated; acquiring operation data of a comprehensive energy system to be evaluated; and calculating the energy step utilization rate of the comprehensive energy system to be evaluated at a determined time interval by using the operation data of the comprehensive energy system to be evaluated, the energy efficiency evaluation parameters and the weight of the energy utilization rate of each energy source, and obtaining an energy efficiency evaluation conclusion of the comprehensive energy system to be evaluated according to the calculation result of the energy step utilization rate. The evaluation method realizes the energy efficiency evaluation of the comprehensive energy system by comprehensively considering the input of electric energy and natural gas, the output of power generation, cooling and heating, and the like.
Description
Technical Field
The invention relates to the technical field of evaluation of a multi-energy complementary energy system, in particular to an energy efficiency evaluation method of a comprehensive energy system.
Background
Under the energy crisis and environmental constraints, the complementation of multiple energy sources becomes a hotspot of research in academic circles and industrial circles in recent years, and the exploration of how to improve the comprehensive energy utilization rate by the complementation and utilization of multiple energy sources on the premise of environmental friendliness becomes a main problem of common attention of all countries in the world, so that the energy efficiency assessment of the energy efficiency assessment is particularly important. The comprehensive energy system is the most extensive implementation form in a regional energy supply system as multi-energy complementation, and the source, network and load depth fusion and close interaction of various energy sources of the comprehensive energy system provide new requirements for system analysis, design and operation. The comprehensive energy system is not simply stacked by multiple energy sources, but integrates multiple energy source input and output and multiple energy source conversion equipment, and can establish corresponding coupling relations among an electric power system, an air supply system, a heat supply system and a cold supply system through information communication. Moreover, compared with individual combat of each energy resource, the comprehensive energy resource system meets the individual demands of diversification of users in the new era, but the utilization efficiency of the energy resource is increased by a certain amount, which cannot be directly known due to the complexity of the comprehensive energy resource system.
Therefore, it is desirable to provide a method for evaluating energy efficiency of a multi-energy complementary energy system.
Disclosure of Invention
The invention aims to provide an energy efficiency evaluation method of an integrated energy system, which starts from the essential characteristics of the multi-energy complementary integrated energy system, sets electric energy as a standard energy utilization form, and realizes energy efficiency evaluation of the integrated energy system by comprehensively considering the input of the electric energy and natural gas, the output of power generation, cooling and heating, and the like.
In order to solve the technical problems, the technical scheme adopted by the invention specifically comprises the following contents:
an energy efficiency evaluation method of an integrated energy system comprises the following steps,
s1: determining the boundary of the comprehensive energy system to be evaluated;
s2: determining a calculation formula of the energy step utilization rate of the comprehensive energy system to be evaluated;
s3: determining the weight of the energy utilization rate of each energy in the comprehensive energy system to be evaluated;
s4: determining energy efficiency evaluation parameters of the comprehensive energy system to be evaluated;
s5: acquiring operation data of the comprehensive energy system to be evaluated;
s6: and calculating the energy step utilization rate of the comprehensive energy system to be evaluated at a determined time interval by using the operation data of the comprehensive energy system to be evaluated, the energy efficiency evaluation parameters and the weight of the energy utilization rate of each energy source, and obtaining an energy efficiency evaluation conclusion of the comprehensive energy system to be evaluated according to the calculation result of the energy step utilization rate.
Preferably, the boundary in step S1 includes the input and output of the integrated energy system to be evaluated, and the input of the integrated energy system to be evaluated includes the natural gas input amount and the power supply input amount, and the output of the integrated energy system to be evaluated includes the power supply output amount, the cooling output amount, and the heating output amount.
Preferably, in step S2, the calculation formula of the energy step utilization rate η is:
wherein e (t) f (t) × H × β + p (t), β ═ 0.0947 × G1/(G2X α), F (t) is the electric quantity consumed by the integrated energy system to be evaluated, and the unit is Nm3(ii) a p (t) is the electric quantity consumed by the comprehensive energy system to be evaluated, and the unit is kW.h; h is the low calorific value of the natural gas adopted by the comprehensive energy system to be evaluated, and the default value is 38 x 103kJ/Nm3α is the comprehensive energy utilization rate of natural gas, the default value is 80%; G1Is natural gas price, and the unit is Yuan/m2；G2The unit is yuan/kW.h for the price of electricity, β is the number of conversion words of the energy standard quality of natural gas input to electricity, W (t) is the output quantity of heat supply, Qc(t) is the cooling output; q. q.seA weight coefficient of energy utilization for power supply output; q. q.scA weight coefficient of energy utilization as cooling output; q. q.shA weight coefficient of energy utilization for heating output; k is a radical ofcCorrecting the coefficient for the cooling temperature; k is a radical ofhThe heating temperature correction coefficient is obtained.
Preferably, the weight coefficient q of the energy utilization rate of the cooling output is set to be a weight coefficientcAnd the weight coefficient q of the energy utilization rate of the power supply outputeAnd a weight coefficient q of energy utilization rate of heating outputhThe calculation formula of (2) is as follows:
S＝G2+G3+G4；
wherein: g2、G3And G4Respectively the electricity price, the cold price and the heat price in the comprehensive energy system to be evaluated.
Preferably, the electricity price G in the comprehensive energy system2Known, and heat value G3And cold price G4The determination of the comprehensive energy system is based on comparing the comprehensive energy system with the corresponding cooling and heating modes, the energy consumption cost saved by obtaining the same cooling capacity and heat capacity is determined as the corresponding cooling price and heating price, and the comparison is generally carried out by adopting a conventional energy supply mode, namely, electric air conditioning refrigeration and gas boiler heating.
Wherein G isf3(Gf4) The price of electricity (gas) consumed for the compared energy supply type refrigeration (heating), cop represents the refrigeration efficiency of the electric air conditioner, ηrAnd H represents the low-level heating value of the natural gas.
Preferably, in step S4, the energy efficiency evaluation parameter of the to-be-evaluated integrated energy system includes an evaluation time interval of an operation stage of the to-be-evaluated integrated energy system, a cooling temperature correction coefficient, a heating temperature correction coefficient, a weight coefficient of a reference point power generation energy utilization rate, an energy utilization rate coefficient of a cooling output, and a weight coefficient of an energy utilization rate of a heating output, and the evaluation time interval of the operation stage of the to-be-evaluated integrated energy system is a maximum sampling interval time of meters set at each input/output gateway of the to-be-evaluated integrated energy system, and a default value of the evaluation time interval is 10 min.
Preferably, the cooling temperature correction coefficient k iscAnd heat supply temperature correction coefficient khThe calculation formula of (2) is as follows:
kc＝(T0-Tc)/ΔTc；
kh＝(Th-T0)/ΔTh；
wherein: t iscThe actual cooling temperature; t ishThe actual heating temperature is used; t is0Is ambient temperature; delta TcThe temperature difference of cold energy is taken as a reference point, the difference between the common cold supply temperature and the ambient temperature is represented, and the default value is 20 ℃; delta ThThe difference between the general heat supply temperature and the environment temperature is represented as the heat energy temperature difference of a reference point, and the default value is 40 ℃.
Preferably, in step S5, the operation data of the to-be-evaluated integrated energy system includes a natural gas supply amount at an input end of the to-be-evaluated integrated energy system, an ambient temperature, an electric power supply amount at an output end, a cooling amount at the output end, and a heating amount at the output end.
Preferably, the energy efficiency assessment conclusion of the comprehensive energy system to be assessed includes an average value and a standard deviation of the energy step utilization rate of the comprehensive energy system to be assessed.
Compared with the prior art, the invention has the beneficial effects that:
the energy efficiency evaluation method of the comprehensive energy system disclosed by the invention starts from the essential characteristics of the multi-energy complementary comprehensive energy system, sets the electric energy as a standard energy utilization form, and realizes the energy efficiency evaluation of the comprehensive energy system by comprehensively considering the input of the electric energy and natural gas, the output of power generation, cooling and heating, and the like.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understandable, the following specific preferred embodiments are described in detail.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present invention with reference to the preferred embodiments is as follows:
the invention discloses an energy efficiency evaluation method of a comprehensive energy system, which comprises the following steps,
s1: and determining the boundary of the comprehensive energy system to be evaluated.
Specifically, in step S1, the boundary includes an input and an output of the integrated energy system to be evaluated, the input of the integrated energy system to be evaluated includes a natural gas input amount and a power supply input amount, and the output of the integrated energy system to be evaluated includes a power supply output amount, a cooling output amount, and a heating output amount; when specifically confirming, because the input and the output of treating the comprehensive energy system that assesses all are provided with the strapping table, consequently, through cold strapping table, heat meter, electric meter and the gas strapping table of the output of treating the comprehensive energy system that assesses and input can acquire treat input and output such as the comprehensive energy system that assesses's power supply output quantity, cooling output quantity and heating output quantity.
S2: and determining a calculation formula of the energy step utilization rate of the comprehensive energy system to be evaluated.
Because the energy step utilization rate comprehensively considers the performance of the cold, heat and electricity products from the perspective of energy grade and cascade utilization, the energy efficiency evaluation of the comprehensive energy system to be evaluated is realized by utilizing the energy step utilization rate of the comprehensive energy system to be evaluated.
In step S2, the energy step utilization rate η is calculated as:
wherein e (t) f (t) × H × β + p (t), β ═ 0.0947 × G1/(G2X α), F (t) is the electric quantity consumed by the integrated energy system to be evaluated, and the unit is Nm3(ii) a p (t) is the electric quantity consumed by the comprehensive energy system to be evaluated, and the unit is kW.h; h is the low calorific value of the natural gas adopted by the comprehensive energy system to be evaluated, and the default value is 38 x 103kJ/Nm3α is the comprehensive energy utilization rate of natural gas, the default value is 80%; G1Is natural gas price, and the unit is Yuan/m2；G2The unit is yuan/kW.h for the price of electricity, β is the number of conversion words of the energy standard quality of natural gas input to electricity, W (t) is the output quantity of heat supply, Qc(t) is the cooling output; q. q.seA weight coefficient of energy utilization for power supply output; q. q.scA weight coefficient of energy utilization as cooling output; q. q.shA weight coefficient of energy utilization for heating output; k is a radical ofcCorrecting the coefficient for the cooling temperature; k is a radical ofhThe heating temperature correction coefficient is obtained.
S3: and determining the weight of the energy utilization rate of each energy in the comprehensive energy system to be evaluated.
Weight coefficient q of energy utilization rate of cooling output amount in concrete calculationcAnd the weight coefficient q of the energy utilization rate of the power supply output quantityeAnd supply of heatWeighting factor q of energy utilization rate of outputhThe calculation formula of (2) is as follows:
S＝G2+G3+G4；
wherein: g2, G3 and G4 are respectively the electricity price, the cold price and the heat price in the comprehensive energy system to be evaluated;
electricity price G in comprehensive energy system2Known, and heat value G3And cold price G4The determination of the comprehensive energy system is based on comparing the comprehensive energy system with the corresponding cooling and heating modes, the energy consumption cost saved by obtaining the same cooling capacity and heat capacity is determined as the corresponding cooling price and heating price, and the comparison is generally carried out by adopting a conventional energy supply mode, namely, the electric air conditioning cooling and the gas boiler heating are adopted.
Wherein G isf3(Gf4) The price of electricity (gas) consumed for the compared energy supply type refrigeration (heating), cop represents the refrigeration efficiency of the electric air conditioner, ηrRepresents the heat supply coefficient of the gas boiler, H represents the low-level heating value of the natural gas,
s4: and determining energy efficiency evaluation parameters of the comprehensive energy system to be evaluated.
Specifically, in step S4, the energy efficiency evaluation parameter of the integrated energy system to be evaluated includes an evaluation time interval of the operation stage of the integrated energy system to be evaluated, a cooling temperature correction coefficient, a heating temperature correction coefficient, a weight coefficient of a reference point power generation energy utilization ratio, an energy utilization ratio coefficient of a cooling output amount, and a weight coefficient of an energy utilization ratio of a heating output amount, and the evaluation time interval of the operation stage of the integrated energy system to be evaluated is a maximum sampling interval time of meters set at each input/output gateway of the integrated energy system to be evaluated, and a default value of the evaluation time interval is 10 min.
In addition, the cooling temperature correction coefficient kcAnd heat supply temperature correction coefficient khThe calculation formula of (2) is as follows:
kc＝(T0-Tc)/ΔTc；
kh＝(Th-T0)/ΔTh；
wherein: t iscThe actual cooling temperature; t ishThe actual heating temperature is used; t is0Is ambient temperature; delta TcThe temperature difference of cold energy is taken as a reference point, the difference between the common cold supply temperature and the ambient temperature is represented, and the default value is 20 ℃; delta ThThe difference between the general heat supply temperature and the environment temperature is represented as the heat energy temperature difference of a reference point, and the default value is 40 ℃.
S5: the method comprises the steps of obtaining operation data of the comprehensive energy system to be evaluated, wherein the operation data of the comprehensive energy system to be evaluated specifically comprise natural gas supply quantity at an input end of the comprehensive energy system to be evaluated, ambient temperature, power supply quantity at an output end, cooling quantity at the output end and heating quantity at the output end.
S6: and calculating the energy step utilization rate of the comprehensive energy system to be evaluated at a determined time interval by using the operation data of the comprehensive energy system to be evaluated, the energy efficiency evaluation parameters and the weight of the energy utilization rate of each energy source, and obtaining an energy efficiency evaluation conclusion of the comprehensive energy system to be evaluated according to the calculation result of the energy step utilization rate. And the energy efficiency evaluation conclusion of the comprehensive energy system to be evaluated comprises an average value and a standard deviation of the energy step utilization rate of the comprehensive energy system to be evaluated.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (9)
1. The energy efficiency evaluation method of the integrated energy system is characterized by comprising the following steps,
s1: determining the boundary of the comprehensive energy system to be evaluated;
s2: determining a calculation formula of the energy step utilization rate of the comprehensive energy system to be evaluated;
s3: determining the weight of the energy utilization rate of each energy in the comprehensive energy system to be evaluated;
s4: determining energy efficiency evaluation parameters of the comprehensive energy system to be evaluated;
s5: acquiring operation data of the comprehensive energy system to be evaluated;
s6: and calculating the energy step utilization rate of the comprehensive energy system to be evaluated at a determined time interval by using the operation data of the comprehensive energy system to be evaluated, the energy efficiency evaluation parameters and the weight of the energy utilization rate of each energy source, and obtaining an energy efficiency evaluation conclusion of the comprehensive energy system to be evaluated according to the calculation result of the energy step utilization rate.
2. The energy efficiency evaluation method according to claim 1, wherein the boundary in step S1 includes an input and an output of the integrated energy system to be evaluated, and the input of the integrated energy system to be evaluated includes a natural gas input amount and a power supply input amount, and the output of the integrated energy system to be evaluated includes a power supply output amount, a cooling output amount, and a heating output amount.
3. The energy efficiency evaluation method according to claim 2, wherein in step S2, the energy step usage rate η is calculated by the formula:
wherein e (t) f (t) × H × β + p (t), β ═ 0.0947 × G1/(G2X α), F (t) is the electric quantity consumed by the comprehensive energy system to be evaluated, and the unit is Nm3(ii) a p (t) is the electric quantity consumed by the comprehensive energy system to be evaluated, and the unit is kW.h; h is the low calorific value of the natural gas adopted by the comprehensive energy system to be evaluated, and the default value is 38 x 103kJ/Nm3α is the comprehensive energy utilization rate of natural gas, the default value is 80%; G1For natural gas prices, the unit is Yuan/m2；G2The unit is yuan/kW.h for the price of electricity, β is the number of conversion words of the energy standard quality of natural gas input to electricity, W (t) is the output quantity of heat supply, Qc(t) is the cooling output; q. q.seA weight coefficient of energy utilization for power supply output; q. q.scA weight coefficient of energy utilization as cooling output; q. q.shA weight coefficient of energy utilization for heating output; k is a radical ofcCorrecting the coefficient for the cooling temperature; k is a radical ofhThe heating temperature correction coefficient is obtained.
4. The energy efficiency evaluation method according to claim 3, wherein the weight coefficient q of the energy utilization rate of the cooling output amountcAnd the weight coefficient q of the energy utilization rate of the power supply output quantityeAnd a weight coefficient q of energy utilization rate of heating outputhIs determined according to the electricity price G in the integrated energy system2Cold price G3And heat value G4To be determined.
S＝G2+G3+G4；
5. The energy efficiency assessment method according to claim 4, characterized in that the electricity price G in the integrated energy system2Known, and heat value G3And cold price G4The determination of the comprehensive energy system is based on comparing the comprehensive energy system with the corresponding cooling and heating modes, the energy consumption cost saved by obtaining the same cooling capacity and heat capacity is determined as the corresponding cooling price and heating price, and the comparison is generally carried out by adopting a conventional energy supply mode, namely, the refrigeration of an electric air conditioner and the heating of a gas boiler.
Wherein G isf3(Gf4) The price of electricity (gas) consumed for the compared energy supply type refrigeration (heating), cop represents the refrigeration efficiency of the electric air conditioner, ηrAnd H represents the low heating value of the natural gas.
6. The energy efficiency assessment method according to claim 5, wherein in step S4, the energy efficiency assessment parameters of the integrated energy system to be assessed include an assessment time interval of the integrated energy system to be assessed in the operation stage, a cooling temperature correction coefficient, a heating temperature correction coefficient, a weight coefficient of a reference point power generation energy utilization rate, an energy utilization coefficient of a cooling output, and a weight coefficient of an energy utilization rate of a heating output, and the assessment time interval of the integrated energy system to be assessed in the operation stage is a maximum sampling interval time of meters set at each input/output gateway of the integrated energy system to be assessed, and a default value of the assessment time interval is 10 min.
7. The energy efficiency evaluation method according to claim 6, characterized in thatCharacterized in that the cooling temperature correction coefficient kcAnd heat supply temperature correction coefficient khThe calculation formula of (2) is as follows:
kc＝(T0-Tc)/ΔTc；
kh＝(Th-T0)/ΔTh；
wherein: t iscThe actual cooling temperature; t ishThe actual heating temperature is used; t is0Is ambient temperature; delta TcThe temperature difference of cold energy is taken as a reference point, the difference between the common cold supply temperature and the ambient temperature is represented, and the default value is 20 ℃; delta ThThe thermal energy temperature difference is a reference point and represents the difference between the ordinary heat supply temperature and the ambient temperature, and the default value is 40 ℃.
8. The energy efficiency assessment method according to claim 7, wherein in step S5, the operation data of the integrated energy system to be assessed includes a natural gas supply amount at an input end of the integrated energy system to be assessed, an ambient temperature, a power supply amount at an output end, a cooling supply amount at an output end, and a heating supply amount at an output end.
9. The energy efficiency assessment method according to any one of claims 1 to 8, wherein the energy efficiency assessment conclusion of the integrated energy system to be assessed includes an average value of energy step utilization rates of the integrated energy system to be assessed and a standard deviation thereof.
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| CN112152199A (en) * | 2020-08-14 | 2020-12-29 | 国网山东综合能源服务有限公司 | Energy efficiency optimization method and system of multi-energy complementary comprehensive energy system |
| CN112950002A (en) * | 2021-02-07 | 2021-06-11 | 国网电力科学研究院武汉能效测评有限公司 | Energy efficiency evaluation method of combined cooling heating and power generation energy system |
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