CN110110991B - Method for constructing comprehensive energy efficiency evaluation system of seawater desalination multi-source multi-load system - Google Patents
Method for constructing comprehensive energy efficiency evaluation system of seawater desalination multi-source multi-load system Download PDFInfo
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- CN110110991B CN110110991B CN201910362375.5A CN201910362375A CN110110991B CN 110110991 B CN110110991 B CN 110110991B CN 201910362375 A CN201910362375 A CN 201910362375A CN 110110991 B CN110110991 B CN 110110991B
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Abstract
The invention discloses a method for constructing a comprehensive energy efficiency evaluation system of a seawater desalination multi-source multi-load system, which comprises the following steps: analyzing energy efficiency of a multi-source multi-load system comprising renewable resources, an energy storage device, refrigerating and heating equipment, a cold-hot electric load and a sea water desalination device, energy efficiency of the device, economic energy efficiency, environmental energy efficiency and social energy efficiency; constructing an energy efficiency index system of a seawater desalination multi-source multi-load system; constructing an energy efficiency index system of the seawater desalination multi-source multi-load system device; constructing an economic energy efficiency index system of a seawater desalination multi-source multi-load system; constructing a seawater desalination multi-source multi-load system environment and a social energy efficiency index system; and combining the indexes to construct a comprehensive energy efficiency index system of the seawater desalination multi-source multi-load system. Thereby ensuring the stable operation of the seawater desalination multi-source multi-load system, improving the economic rationality, the level of renewable resource consumption, the environmental protection and the social benefit of the system and ensuring the best comprehensive benefit in all aspects.
Description
Technical Field
The invention relates to the field of construction of a seawater desalination benefit analysis and comprehensive energy efficiency evaluation system, in particular to a construction method of a seawater desalination multi-source multi-load system comprehensive energy efficiency evaluation system.
Background
Water resources are taken as basic natural resources, and have important influence on human survival and economic development. Along with the rapid development of market economy in China and the continuous acceleration of the urban development process, water resources, especially fresh water resources, are applied in an ultra-limited way, so that the contradiction between supply and demand is continuously expanded. The sea water desalting technology has the advantages of simple principle, mature technology and no influence of space time and climate, and gradually becomes an important way for solving the problem of lack of Chinese fresh water resources.
The proposal of the energy Internet concept provides a new thought for relieving energy crisis and environmental problems and receives wide attention. As an important form of energy internet, the multi-source multi-load system has important significance for fully promoting the large-scale, flexible and efficient access and consumption of renewable energy. Meanwhile, renewable energy resources such as solar energy and wind energy in coastal areas are quite rich, and the resources are fully utilized, so that the method is an important scheme for solving the problems of high energy consumption, environmental pollution and the like of sea water desalination.
The seawater desalination multi-source multi-load system relates to rich equipment, various systems and complex correlation, and the characteristics of each equipment and renewable energy sources need to be fully considered when an index construction system is selected, so that the attribute of each angle of the system is comprehensively evaluated. Meanwhile, renewable resources in the seawater desalination multi-source multi-load system have the characteristics of intermittence and instability, which brings difficulty to the establishment of an evaluation index system and an evaluation method. Therefore, the evaluation criteria for comparing and optimizing the seawater desalination multi-source multi-load system become the hot spot and difficulty of the current research. The establishment of an index system is the basis of comprehensive energy efficiency evaluation, and the establishment of a reasonable index system is a precondition that an evaluation result has scientificity and reliability. The complex influence factors lead to numerous evaluation indexes of the seawater desalination multi-source multi-load system, and the subjective and objective indexes coexist, so that unified standards are difficult to form, and the accuracy of an evaluation result is difficult to ensure. The comprehensive evaluation technology related to multiple dimensions of energy sources, devices, economy, environment, society and the like is required to be provided according to the energy efficiency characteristics of the seawater desalination multi-source multi-load system.
Therefore, establishing a reasonable and uniform evaluation index system is an important task. The method is an effective way for realizing the stable operation of the seawater desalination multi-source multi-load system, improving the economic rationality, the environmental protection and the social benefit of the system and ensuring the best comprehensive benefit in all aspects.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for constructing a comprehensive energy efficiency evaluation system of a seawater desalination multi-source multi-load system. The method is an effective way for realizing the stable operation of the seawater desalination multi-source multi-load system, improving the economic rationality, the environmental protection and the social benefit of the system and ensuring the best comprehensive benefit in all aspects.
The invention aims at realizing the following technical scheme:
the method for constructing the comprehensive energy efficiency evaluation system of the seawater desalination multi-source multi-load system comprises the following steps:
(1) Constructing an energy efficiency index system of a seawater desalination multi-source multi-load system;
(2) Constructing an energy efficiency index system of the seawater desalination multi-source multi-load system device;
(3) Constructing an economic energy efficiency index system of a seawater desalination multi-source multi-load system;
(4) Constructing a seawater desalination multi-source multi-load system environment and a social energy efficiency index system;
(5) Comprehensively considering the established energy efficiency index system, the device energy efficiency index system, the economic energy efficiency index system, the environment and the social energy efficiency index system to construct the comprehensive energy efficiency index system of the seawater desalination multi-source multi-load system.
Further, the energy efficiency index system comprises 5 sub-indexes capable of evaluating the energy efficiency level of the seawater desalination multi-source multi-load system, and the sub-indexes comprise renewable energy efficiency level, energy storage energy efficiency level, electric energy efficiency level, heat energy efficiency level and cold energy efficiency level.
Further, the renewable energy efficiency level is defined as:
wherein P is P P is the total annual photovoltaic power generation amount in a multisource and multisource system T The total annual wind power generation amount is operated in a multisource and multishare system; p (P) A The total power generation amount of renewable energy sources is theoretical year-round under the average illumination and wind power level of the local year;
the energy storage energy efficiency level is defined as:
wherein P is out P is the discharge amount of the energy storage system in A charge amount for the energy storage system;
the electrical energy efficiency level is defined as follows:
wherein P is EL Supplying the multi-source multi-load system with electrical energy of an electrical load; p (P) EI The power consumed by power consumption equipment of the multi-source multi-load system; p (P) EW The electric energy required by the water is produced for the seawater desalination device; p (P) RE 、P S 、P G The renewable energy electric energy supply, the energy storage and discharge capacity and the electric power input of the power grid of the multi-source multi-charge system are respectively carried out;
the thermal energy efficiency level is defined as follows:
wherein Q is HL Supplying heat energy of thermal load to multi-source multi-load system, Q HI The heat energy consumed by heat consumption equipment and a sea water desalination device in the multi-source multi-load system; q (Q) HW The electric energy required by the water is produced for the seawater desalination device; q (Q) CHP 、Q GB 、Q EB The heat energy generated by the CHP, the gas boiler and the electric boiler of the multi-source multi-load system is respectively;
the cold energy efficiency level is defined as follows:
wherein Q is CL Refrigerating capacity for supplying cold load to multi-source multi-load system, Q CI The refrigerating capacity consumed in the multi-source multi-load system is used; q (Q) EC 、Q AC The refrigerating capacity of the electric refrigerator and the absorption refrigerator respectively.
Further, the device energy efficiency index system comprises 5 sub-indexes capable of evaluating the energy efficiency level of the seawater desalination multi-source multi-load system, wherein the sub-indexes comprise average energy conversion efficiency, device equipment utilization rate, device equipment failure rate, device service life span and device operation maintenance coefficient indexes.
Further, the average energy conversion efficiency is defined as follows
Wherein E is out For the energy output of the apparatus E in N is the number of energy utilization and conversion devices in the seawater desalination multi-source multi-charge system, M is the energy input quantity of the device FW For the fresh water yield of the sea water desalination device, M SW The sea water consumption is used for sea water desalination devices;
the utilization rate of the device equipment is defined as follows
Wherein T is AU The number of actual operation machine hours of a daily system for a single device, T PU Planning the operation time number of a system every day for a single device, wherein n is the number of devices in the seawater desalination multi-source multi-load system; t (T) WAU For the actual operation time number, T, of the seawater desalination every day WPU The number of operating machine hours is planned daily for sea water desalination;
the failure rate of the equipment is defined as follows
Wherein T is FT For single equipment failure down time, T NT N is the number of equipment in the seawater desalination multi-source multi-load system, wherein n is the normal operation time of a single equipment; t (T) WFT For the failure stop time of the sea water desalting device, T WNT The normal running time of the sea water desalting device is set;
the service life of the device is as follows
Wherein t is EU For the normal use and loss of a single deviceThe expected service life of the device; n is the number of equipment in the seawater desalination multi-source multi-load system; t is t WU The expected service life of the sea water desalting device under the normal use and loss conditions is prolonged;
the device operation maintenance coefficient is defined as follows
Wherein t is MA Time, t, spent for maintenance of one operating cycle of a single device OP The normal working time of one operation period of a single device is n is the number of devices in the seawater desalination multi-source multi-load system; t is t WMA Time, t, spent for maintenance of the operational cycle of the desalination plant WOP Is the normal operating time of the run cycle.
Further, the economic energy efficiency index system comprises 5 sub-indexes capable of evaluating the economic energy efficiency level of the seawater desalination multi-source multi-load system, and the 5 sub-indexes comprise comprehensive energy cost, system investment cost, system operation maintenance cost, system output benefit and system comprehensive yield index.
Further, the comprehensive energy cost is defined as follows:
W EC ＝W ELE +W GAS +W WAT (30)
wherein W is ELE The electricity purchasing cost of the operation of the seawater desalination multi-source multi-charge system is W GAS The gas purchasing cost of the operation of the micro-multisource multi-load system for sea water desalination is a typical operation day, W WAT The cost of obtaining the seawater required by the seawater desalination process is a typical operation day;
the system investment cost is defined as follows:
W SI ＝W DI +W WI +W OI (31)
wherein W is DI Fixed investment cost for equipment of system construction, W WI Is the investment cost of the sea water desalination device in the system, W OI To invest in cost for other links in the system construction processThe method comprises the following steps of planning and designing cost, pipeline construction cost, survey and measurement cost, land use cost, temporary facility cost and budget investigation cost;
cost of system operation and maintenance W OM Costs incurred in the operation and maintenance process during the operation period, including costs incurred for devices, pipelines, and seawater desalination equipment in the system;
the system output benefit is defined as follows:
W OB ＝W Eload +W Hload +W Cload +W Wload (32)
wherein W is Eload 、W Hload 、W Cload 、W Wload The yields of electricity, heat and cold load supply and fresh water output are respectively obtained;
the comprehensive yield of the system is defined as:
the ratio of the total output income to the total input cost of the system is obtained.
Further, the environment and social energy efficiency index system comprises 5 sub-indexes capable of evaluating the environment and social energy efficiency level of the seawater desalination multi-source multi-charge system, wherein the sub-indexes comprise pollutant emission energy efficiency level, waste energy efficiency level, environment contribution energy efficiency level, user energy efficiency acceptance and social energy efficiency acceptance indexes.
Further, the pollutant emission energy efficiency level is defined as:
wherein W is EIN Is the total energy input quantity, including renewable energy sources, electric energy and fuel gas energy input, G m The emission amount of the single pollutant is represented by m, and the number of pollutant types is represented by m;
the energy efficiency level of the waste is defined as:
wherein H is m Defined as a single waste amount;
environmental contribution energy efficiency level, defined as:
wherein M is P Reducing carbon dioxide emission for photovoltaic power generation, M T Converting carbon dioxide emission reduction for wind power generation, M C Converting carbon dioxide emissions for total energy consumption of non-renewable resources in system operation;
user energy efficiency acceptance, defined as:
I U ＝I UC +I UH +I UE +I UW (37)
wherein I is UC 、I UH 、I UE 、I UW The identity of users to cold, heat, electricity and water energy is shown respectively;
social energy efficiency acceptance, defined as:
I S ＝I SU +I SE +I SS (38)
wherein I is SU 、I SU 、I SS The social service system respectively provides the social service for the user, and the environment contribution and the acceptance of the social contribution; wherein, the acceptance is a subjective quantity of a measure on the acceptance level of things, which can be obtained by means of a questionnaire and the like, the score is between 1 and 10, 1 is very unsatisfactory, and 10 is very satisfactory.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the invention describes a method for constructing a comprehensive energy efficiency evaluation system of a seawater desalination multi-source multi-load system, wherein the multi-source multi-load system comprises renewable resources such as photovoltaic, wind power and the like, energy storage devices such as storage batteries and the like, refrigerating and heating equipment such as CHP, gas boilers, electric refrigerators, absorption refrigerators and the like, cold and hot electric loads, seawater desalination devices and the like, and various energy sources are mutually coupled and have cold, heat, electricity and fresh water output.
2. The invention evaluates and prefers the energy efficiency of system construction and operation through the established energy efficiency index system, can improve the level of the absorption of renewable resources such as photovoltaic and wind power, improve the operation efficiency of the energy storage device and improve the energy utilization efficiency of cold, heat and electricity.
3. The invention evaluates and prefers the energy efficiency of the device for system construction and operation through the established device energy efficiency index system, can improve the energy conversion efficiency of each device of the system, the equipment utilization rate, the service life of the device and reduce the operation maintenance time.
4. The invention evaluates and prefers the economic energy efficiency of system construction and operation through the established economic energy efficiency index system, and improves the system output income and the energy comprehensive utilization efficiency under the condition of less investment and operation maintenance cost.
5. The invention evaluates and prefers the environment and social energy efficiency of system construction and operation through the established environment and social energy efficiency index system, reduces the pollutant emission level and the waste emission, and improves the acceptance level of users and society for the multi-source and multi-load system.
Drawings
FIG. 1 is a schematic diagram of a comprehensive energy efficiency evaluation system implemented by the present invention.
FIGS. 2-1 and 2-2 are models of a seawater desalination multi-source multi-charge system employing typical thermal and membrane processes, respectively.
Detailed Description
The invention is described in further detail below with reference to the drawings and the specific examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The specific embodiment discloses a method for constructing a comprehensive energy efficiency evaluation system of a seawater desalination multi-source multi-load system, which comprises the following steps:
constructing an energy efficiency index system of the seawater desalination multi-source multi-load system.
Constructing an energy efficiency index system of the seawater desalination multi-source multi-load system device.
Constructing an economic energy efficiency index system of the seawater desalination multi-source multi-load system.
Constructing a seawater desalination multi-source multi-load system environment and a social energy efficiency index system.
The integrated energy efficiency index system of the seawater desalination multi-source multi-load system is constructed by comprehensively considering the established energy efficiency index system, the device energy efficiency index system, the economic energy efficiency index system, the environment and the social energy efficiency index system, as shown in figure 1.
Renewable energy sources are introduced into a seawater desalination system to form a multi-source multi-load system, so that the seawater desalination is realized simultaneously with cold, heat and electricity production, the method is an effective means for solving the energy source problem of the traditional seawater desalination, is helpful for relieving the crisis of fresh water resources, and ensures the production and life of human beings and the economic development. In a seawater desalination multi-source multi-charge system comprising renewable resources such as photovoltaic, wind power and the like, energy storage devices such as storage batteries and the like, refrigerating and heating equipment such as CHP, gas boilers, electric refrigerators, absorption refrigerators and the like, a cold-hot electric load, a seawater desalination device and various energy sources are mutually coupled, and the seawater desalination multi-source multi-charge system is provided with cold, hot, electric and fresh water output, a comprehensive evaluation system comprising energy sources, devices, economy, environment and social energy efficiency indexes is introduced, so that the problems of construction and operation of the seawater desalination multi-source multi-charge system can be better solved, and the seawater desalination multi-source multi-charge system is shown in figures 2-1 and 2-2.
In order to ensure the energy utilization efficiency of the seawater desalination multi-source multi-load system, an energy efficiency index system of the seawater desalination multi-source multi-load system is established from the energy efficiency angle. The energy efficiency index system comprises five sub-indexes of renewable energy efficiency level, energy storage energy efficiency level, electric energy efficiency level, thermal energy efficiency level and cold energy efficiency level.
The seawater desalination multi-source multi-charge system comprises renewable resources such as photovoltaic, wind power and the like, and the defect of seawater desalination energy consumption can be effectively alleviated by high renewable energy utilization efficiency, so that the measurement of the renewable energy efficiency level is an important means for judging the energy efficiency of the multi-source multi-charge system, and the energy efficiency can be calculated by the following formula:
wherein eta RE Renewable energy efficiency level for multi-source multi-load system, P P P is the total annual photovoltaic power generation amount in a multisource and multisource system T The total annual wind power generation amount is operated in a multi-source multi-load system. P (P) A The total power generation amount of renewable energy sources is theoretical year-round under the average light and wind power level of the local year.
The energy storage can store redundant electric energy when renewable energy sources are sufficient, and release electric energy when renewable energy sources are insufficient and faults so as to ensure the normal operation of the seawater desalination multi-source multi-load system. The energy storage energy efficiency level is defined as follows:
wherein eta ST Energy storage energy efficiency level for multi-source multi-charge system, P out P is the discharge amount of the energy storage system in Is the charge of the energy storage system.
The sea water desalination multi-source multi-charge system has the output of cold, heat and electricity energy, and the output and utilization efficiency of the three energy sources are important indexes of the energy efficiency level eta of the multi-source multi-charge system E The definition is as follows:
wherein P is EL The multi-source multi-charge system is supplied with electrical energy from an electrical load. P (P) EI The electric energy consumed by the equipment such as an electric refrigerator, an electric boiler and the like. P (P) EW The electric energy required by the water is produced for the seawater desalination device. P (P) RE ，P S ，P G The system is used for supplying renewable energy electric energy of a multi-source multi-load system, storing energy discharge capacity and inputting electric energy of a power grid.
Heat energy efficiency level eta H The definition is as follows:
wherein Q is HL Supplying heat energy of thermal load to multi-source multi-load system, Q HI The heat energy consumed by equipment such as an absorption refrigerator, a sea water desalination device and the like. Q (Q) HW The electric energy required by the water is produced for the seawater desalination device. Q (Q) CHP ，Q GB ，Q EB The heat energy generated by the CHP, the gas boiler and the electric boiler of the multi-source multi-load system is provided.
Level eta of cold energy efficiency C The definition is as follows:
wherein Q is CL Refrigerating capacity for supplying cold load to multi-source multi-load system, Q CI Is the refrigerating capacity consumed in the multi-source multi-load system. Q (Q) EC ，Q AC The refrigerating capacity of the electric refrigerator and the absorption refrigerator.
In order to ensure the device utilization efficiency of the seawater desalination multi-source multi-charge system, an energy efficiency index system of the seawater desalination multi-source multi-charge system device is established from the angle of device energy efficiency. The device energy efficiency index system comprises five sub-indexes of average energy conversion efficiency, device equipment utilization rate, device equipment failure rate, device service life, and device operation maintenance coefficient.
The seawater desalination multi-source multi-charge system comprises energy storage, CHP, gas boiler, electric refrigerator, absorption refrigerator and other equipment, and in the energy utilization and conversion process, the device energy conversion efficiency, device equipment utilization rate, device equipment failure rate, device service life span and device operation maintenance coefficient are important indexes for measuring the energy efficiency of the multi-source multi-charge system, and the average energy conversion efficiency eta EC The definition is as follows:
wherein E is out For the energy output of the apparatus E in N is the number of equipment in the seawater desalination multi-source multi-load system and M is the energy input quantity of the device FW For desalinating sea water and fresh water yield, M SW The method is used for sea water desalination.
Device and equipment utilization rate eta EU The definition is as follows:
wherein T is AU The number of actual operation machine hours of a daily system for a single device, T PU The number of machine hours of operation is planned for a single equipment daily system, and n is the number of equipment in the seawater desalination multi-source multi-load system. T (T) WAU For the actual operation time number, T, of the seawater desalination every day WPU The number of operating machine hours per day is planned for sea water desalination.
Failure rate eta of device and equipment EF The definition is as follows:
wherein T is FT For single equipment failure down time, T NT The normal operation time of a single device is n, and the number of the devices in the seawater desalination multi-source multi-load system is n. T (T) WFT For the failure stop time of the sea water desalting device, T WNT Is the normal running time of the sea water desalting device.
Device life time T EU The definition is as follows:
wherein t is EU The service life of the device is expected under the conditions of normal use and loss of a single device. n is the number of equipment in the seawater desalination multi-source multi-load system. t is t WU The service life of the sea water desalting device is expected under the conditions of normal use and loss.
Device and method for controlling the sameOperation maintenance coefficient R OM The definition is as follows:
wherein t is MA Time, t, spent for maintenance of one operating cycle of a single device OP The normal working time of one operation period of a single device is n is the number of devices in the seawater desalination multi-source multi-load system. t is t WMA Time, t, spent for maintenance of the operational cycle of the desalination plant WOP Is the normal operating time of the run cycle.
In order to ensure the energy economic benefit of the seawater desalination multi-source multi-load system, an economic energy efficiency index system of the seawater desalination multi-source multi-load system is established from the economic energy efficiency angle. The economic energy efficiency index system comprises five sub-indexes of comprehensive energy cost, system investment cost, system operation and maintenance cost, system output benefit and system comprehensive yield.
The sea water desalting multisource and multi-load system produces fresh water, cold, heat and electricity, and can bring benefits. The main investment in the construction process is the construction cost of the device equipment, and the main investment in the operation process is the energy investment and the operation maintenance investment. The comprehensive energy cost, the system investment cost, the system operation maintenance cost, the system output benefit and the system comprehensive yield rate of the multi-source multi-load system are analyzed in an economic aspect, and the method is an important link for analyzing the energy input and output of the multi-source multi-load system, and the index related to the economic energy efficiency is defined as follows.
Comprehensive energy cost W EC The definition is as follows:
W EC ＝W ELE +W GAS +W WAT (49)
wherein W is ELE The electricity purchasing cost of the operation of the seawater desalination multi-source multi-charge system is W GAS The gas purchasing cost, W, of the operation of the seawater desalination multi-source multi-load system is a typical operation day WAT The cost of obtaining the seawater required for the seawater desalination process is a typical operating day.
System investmentCost W SI The definition is as follows:
W SI ＝W DI +W WI +W OI (50)
wherein W is DI Fixed investment cost for equipment of system construction, W WI Is the investment cost of the sea water desalination device in the system, W OI Investment cost for other links in the system construction process, such as pipeline construction, land use cost and the like.
Cost of system operation and maintenance W OM The cost paid in the operation and maintenance process at least comprises planning and design cost, pipeline construction cost, survey measuring cost, land use cost, temporary facility cost and budget examination cost.
System yield benefit W OB The definition is as follows:
W OB ＝W Eload +W Hload +W Cload +W Wload (51)
wherein W is Eload ，W Hload ，W Cload ，W Wload Is the benefit of electricity, heat and cold load supply and fresh water output.
Comprehensive system yield W AB The definition is as follows:
the ratio of the total yield of the system to the total input cost is obtained.
In order to ensure the environmental and social benefits of the seawater desalination multi-source multi-load system, an environmental and social energy efficiency index system of the seawater desalination multi-source multi-load system is established from the environmental and social energy efficiency angles. The environmental and social energy efficiency index system comprises five sub-indexes of pollutant emission energy efficiency level, waste energy efficiency level, environmental contribution energy efficiency level, user energy efficiency acceptance and social energy efficiency acceptance.
In the process of energy output and input utilization of the seawater desalination multi-source multi-load system, the environment and the society are influenced, so that environment and social energy efficiency indexes are defined to analyze the environment and social influence of energy sources. Defining pollutant emission energy efficiency level, waste energy efficiency level, environment contribution energy efficiency level, user energy efficiency acceptance and social energy efficiency acceptance as follows:
pollutant emission energy efficiency level eta CE The definition is as follows:
wherein W is EIN Is the total energy input quantity, including renewable energy sources, electric energy and fuel gas energy input, G m And m is the number of pollutant types.
Waste energy efficiency level eta WE The definition is as follows:
wherein H is m Defined as a single waste amount.
Environmental contribution energy efficiency level eta ED The definition is as follows:
wherein M is P Reducing carbon dioxide emission for photovoltaic power generation, M T Converting carbon dioxide emission reduction for wind power generation, M C The total energy consumption of non-renewable resources in the system operation is converted into carbon dioxide emission.
User energy efficiency acceptance I U The definition is as follows:
I U ＝I UC +I UH +I UE +I UW (56)
wherein I is UC ，I UH ，I UE ，I UW Respectively represent the acceptance of users to cold, heat, electricity and water energy.
Social energy efficiency acceptance I S The definition is as follows:
I S ＝I SU +I SE +I SS (57)
wherein I is SU ，I SU ，I SS The method is used for serving the society to the user, and has environmental contribution and acceptance of social contribution. Wherein, the acceptance is a subjective quantity of a measure on the acceptance level of things, which can be obtained by means of a questionnaire and the like, the score is between 1 and 10, 1 is very unsatisfactory, and 10 is very satisfactory.
The invention is not limited to the embodiments described above. The above description of specific embodiments is intended to describe and illustrate the technical aspects of the present invention, and is intended to be illustrative only and not limiting. Numerous specific modifications can be made by those skilled in the art without departing from the spirit of the invention and scope of the claims, which are within the scope of the invention.
Claims (1)
1. A method for constructing a comprehensive energy efficiency evaluation system of a seawater desalination multi-source multi-load system is characterized by comprising the following steps: the method comprises the following steps:
(1) Constructing an energy efficiency index system of a seawater desalination multi-source multi-load system; the energy efficiency index system comprises 5 sub-indexes capable of evaluating the energy efficiency level of the seawater desalination multi-source multi-load system, including renewable energy efficiency level, energy storage energy efficiency level, electric energy efficiency level, heat energy efficiency level and cold energy efficiency level; the renewable energy efficiency level is defined as:
wherein P is P P is the total annual photovoltaic power generation amount in a multisource and multisource system T The total annual wind power generation amount is operated in a multisource and multishare system; p (P) A The total power generation amount of renewable energy sources is theoretical year-round under the average illumination and wind power level of the local year;
the energy storage energy efficiency level is defined as:
wherein P is out P is the discharge amount of the energy storage system in A charge amount for the energy storage system;
the electrical energy efficiency level is defined as follows:
wherein P is EL Supplying the multi-source multi-load system with electrical energy of an electrical load; p (P) EI The power consumed by power consumption equipment of the multi-source multi-load system; p (P) EW The electric energy required by the water is produced for the seawater desalination device; p (P) RE 、P S 、P G The renewable energy electric energy supply, the energy storage and discharge capacity and the electric power input of the power grid of the multi-source multi-charge system are respectively carried out;
the thermal energy efficiency level is defined as follows:
wherein Q is HL Supplying heat energy of thermal load to multi-source multi-load system, Q HI The heat energy consumed by heat consumption equipment and a sea water desalination device in the multi-source multi-load system; q (Q) HW The electric energy required by the water is produced for the seawater desalination device; q (Q) CHP 、Q GB 、Q EB The heat energy generated by the CHP, the gas boiler and the electric boiler of the multi-source multi-load system is respectively;
the cold energy efficiency level is defined as follows:
wherein Q is CL Refrigerating capacity for supplying cold load to multi-source multi-load system, Q CI The refrigerating capacity consumed in the multi-source multi-load system is used; q (Q) EC 、Q AC The refrigerating capacity of the electric refrigerator and the absorption refrigerator respectively;
(2) Constructing an energy efficiency index system of the seawater desalination multi-source multi-load system device; the device energy efficiency index system comprises 5 sub-indexes capable of evaluating the energy efficiency level of the seawater desalination multi-source multi-load system, wherein the sub-indexes comprise average energy conversion efficiency, device equipment utilization rate, device equipment failure rate, device service life years and device operation maintenance coefficient indexes; the average energy conversion efficiency is defined as follows
Wherein E is out For the energy output of the apparatus E in N is the number of equipment in the seawater desalination multi-source multi-load system and M is the energy input quantity of the device FW For the fresh water yield of the sea water desalination device, M SW The sea water consumption is used for sea water desalination devices;
the utilization rate of the device equipment is defined as follows
Wherein T is AU The number of actual operation machine hours of a daily system for a single device, T PU Planning the operation time number of a system every day for a single device, wherein n is the number of devices in the seawater desalination multi-source multi-load system; t (T) WAU For the actual operation time number, T, of the seawater desalination every day WPU The number of operating machine hours is planned daily for sea water desalination;
the failure rate of the equipment is defined as follows
Wherein T is FT For single equipment failure down time, T NT The normal operation time of a single equipment is that n is the sea water desalination multisourceThe number of devices in the multi-load system; t (T) WFT For the failure stop time of the sea water desalting device, T WNT The normal running time of the sea water desalting device is set;
the service life of the device is as follows
Wherein t is EU The service life of the device is expected under the conditions of normal use and loss of a single device; n is the number of equipment in the seawater desalination multi-source multi-load system; t is t WU The expected service life of the sea water desalting device under the normal use and loss conditions is prolonged;
the device operation maintenance coefficient is defined as follows
Wherein t is MA Time, t, spent for maintenance of one operating cycle of a single device OP The normal working time of one operation period of a single device is n is the number of devices in the seawater desalination multi-source multi-load system; t is t WMA Time, t, spent for maintenance of the operational cycle of the desalination plant WOP The normal working time of the operation period;
(3) Constructing an economic energy efficiency index system of a seawater desalination multi-source multi-load system; the economic energy efficiency index system comprises 5 sub-indexes capable of evaluating the economic energy efficiency level of the seawater desalination multi-source multi-load system, wherein the 5 sub-indexes comprise comprehensive energy cost, system investment cost, system operation maintenance cost, system output benefit and system comprehensive yield index; the comprehensive energy cost is defined as follows:
W EC ＝W ELE +W GAS +W WAT (11)
wherein W is ELE The electricity purchasing cost of the operation of the seawater desalination multi-source multi-charge system is W GAS As a typical operation day, the sea water desalination is carried out by a micro-multisourceCost of purchasing gas for multi-load system operation, W WAT The cost of obtaining the seawater required by the seawater desalination process is a typical operation day;
the system investment cost is defined as follows:
W SI ＝W DI +W WI +W OI (12)
wherein W is DI Fixed investment cost for equipment of system construction, W WI Is the investment cost of the sea water desalination device in the system, W OI Investment cost for other links in the system construction process at least comprises planning design cost, pipeline construction cost, survey measuring cost, land use cost, temporary facility cost and budget investigation cost;
cost of system operation and maintenance W OM Costs incurred in the operation and maintenance process during the operation period, including costs incurred for devices, pipelines, and seawater desalination equipment in the system;
the system output benefit is defined as follows:
W OB ＝W Eload +W Hload +W Cload +W Wload (13)
wherein W is Eload 、W Hload 、W Cload 、W Wload The yields of electricity, heat and cold load supply and fresh water output are respectively obtained;
the comprehensive yield of the system is defined as:
the ratio of the total output income to the total input cost of the system is;
(4) Constructing a seawater desalination multi-source multi-load system environment and a social energy efficiency index system; the environment and social energy efficiency index system comprises 5 sub-indexes capable of evaluating the environment and social energy efficiency level of the seawater desalination multi-source multi-load system, wherein the sub-indexes comprise pollutant emission energy efficiency level, waste energy efficiency level, environment contribution energy efficiency level, user energy efficiency acceptance and social energy efficiency acceptance indexes; the pollutant emission energy efficiency level is defined as:
wherein W is EIN Is the total energy input quantity, including renewable energy sources, electric energy and fuel gas energy input, G m The emission amount of the single pollutant is represented by m, and the number of pollutant types is represented by m;
the energy efficiency level of the waste is defined as:
wherein H is m Defined as a single waste amount;
environmental contribution energy efficiency level, defined as:
wherein M is P Reducing carbon dioxide emission for photovoltaic power generation, M T Converting carbon dioxide emission reduction for wind power generation, M C Converting carbon dioxide emissions for total energy consumption of non-renewable resources in system operation;
user energy efficiency acceptance, defined as:
I U ＝I UC +I UH +I UE +I UW (18)
wherein I is UC 、I UH 、I UE 、I UW The identity of users to cold, heat, electricity and water energy is shown respectively;
social energy efficiency acceptance, defined as:
I S ＝I SU +I SE +I SS (19)
wherein I is SU 、I SU 、I SS The social service system respectively provides the social service for the user, and the environment contribution and the acceptance of the social contribution; wherein the identity degree is a measure of identity water for thingsThe flat subjective quantity can be obtained by means of questionnaires and the like, the score is between 1 and 10, 1 is very unsatisfactory, and 10 is very satisfactory;
(5) Comprehensively considering the established energy efficiency index system, the device energy efficiency index system, the economic energy efficiency index system, the environment and the social energy efficiency index system to construct the comprehensive energy efficiency index system of the seawater desalination multi-source multi-load system.
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