CN108133301A - A kind of region cold, heat and electricity triple supply fractional energy savings fast arithmetic for considering different operating modes - Google Patents
A kind of region cold, heat and electricity triple supply fractional energy savings fast arithmetic for considering different operating modes Download PDFInfo
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Abstract
A kind of region cold, heat and electricity triple supply fractional energy savings fast arithmetic of the different operating modes of consideration of the present invention,It is related to electric power,Combustion gas heating power,Cooling water and the trilogy supply field of relevant production and supply,More particularly to the fractional energy savings applied to quick zoning cold, heat and electricity triple supply,The fast arithmetic of the present invention can be applied to the region of different operating modes,It solves the problems, such as currently to only rely on the first law of thermodynamics and the second law of thermodynamics and region cold, heat and electricity triple supply fractional energy savings can not be computed correctly,The present invention can quickly and the fractional energy savings of accurate zoning cold, heat and electricity triple supply,And region cold, heat and power triple supply system is divided into two kinds of operating modes by the present invention,That is supplying thermal condition and cooling operating mode,And calculate its fractional energy savings respectively under both operating modes,However supplying thermal condition fractional energy savings and cooling operating mode fractional energy savings are subjected to certain combination again and calculated,Obtain accurate energy saving of system rate.
Description
Technical field
The present invention relates to electric power, combustion gas heating power, cooling (water) and the trilogy supply fields of relevant production and supply, especially relate to
And the method for the fractional energy savings applied to quick zoning cold, heat and electricity triple supply, the fast arithmetic can be applied to the area of different operating modes
Domain.
Background technology
Currently, the novel energy skill that region cold, heat and power triple supply system is country and each province and city energy field emphasis promotes
Art, however since the region cold, heat and power triple supply system development more than ten years, the calculating of fractional energy savings has become puzzlement cold, heat and electricity three-way
For system designing unit, construction unit, assessment unit, unit of operation, research unit problem, worked out one under the prior art
A little computational methods can be used for the fractional energy savings of zoning cold, heat and power triple supply system, can be classified as following three classes：
1. the primary energy consumption saving rate calculating method based on the first law of thermodynamics, specific as follows：
Region cold, heat and power triple supply system design builds, uses this method zoning cool and thermal power three more in evaluation process
Co-feeding system fractional energy savings, i.e., using the ratio conduct of region cold, heat and power triple supply system output energy total amount and input energy sources total amount
The primary energy ratio of region cold, heat and power triple supply system, then its output phase with reference is energized with the routine of quantity product
System compares, so as to obtain project fractional energy savings.Calculation formula is as follows：
Wherein：PERCCHPFor the primary energy ratio of region cold, heat and power triple supply system, unit：%；
PERCHPSPrimary energy ratio during for cool and thermal power point production, unit：%；
Qheat_loadFor region cold, heat and power triple supply system heating load, unit：kWh；
Qcooling_loadFor region cold, heat and power triple supply system semen donors, unit：kWh；
PelFor region cold, heat and power triple supply system generated energy, unit：kWh；
QinFuel heat, unit are inputted for region cold, heat and power triple supply system：kWh；
PinElectricity, unit are inputted for region cold, heat and power triple supply system：kWh；
ηboilerFor gas fired-boiler efficiency, unit：%；
COPchilerFor the electric refrigerator coefficient of performance, unit：kWh/kWh；
ηinFor a point production energy resource system generating efficiency, unit：%；
ΔqpFor primary energy consumption saving rate, unit：%.
This method is the primary energy consumption saving rate calculating method based on the first law of thermodynamics, relatively simple, but this method is such as
There are two problems when fruit is applied to region cold, heat and power triple supply system：
1) this method equally treats hot and cold, electric three kinds of energy, is not both subject to area with grade to the energy level for exporting the energy
Point, also share situation without what rationally reflection generated that these three energy consume fuel；
2) this method, which does not account for, applies a large amount of electrical chillers, heat pump in the cold, heat and power triple supply system of region,
It is also easy to produce calculating mistake.For example, if the cold that region cold, heat and power triple supply system electrical chillers generate is much larger than absorption
The cold that refrigeration unit generates (sets in the cold, heat and power triple supply system of region distributing-supplying-energy system refrigerating capacity as overall refrigerating effect
50%, electric refrigerating capacity is the 50% of overall refrigerating effect, and the COP of absorption refrigeration unit is 1, and electrical chillers COP is 5.5), by formula
During 1 calculating, PERCCHPMore than 1, law of conservation of energy has been violated, meanwhile, when calculating fractional energy savings, there is energy-saving benefit and be much larger than
The illusion of actual conditions.
In addition to this 2 problems above, if region cold, heat and power triple supply system only inputs single-fuel, and the fuel is all used
In power generation, then formula 1, formula 2, formula 3 are set up, meanwhile, according to the result that the first law of thermodynamics calculates with according to thermodynamics second
The result that law calculates is closer to.Therefore, the primary energy consumption saving rate method based on the first law of thermodynamics is only applicable to single
The energy source and power of region cold, heat and power triple supply system under the pure generating operation mode of fuel, i.e., single energy input and the output of the single energy
System.
The primary energy consumption saving rate calculating method based on the first law of thermodynamics also has a kind of variant form, i.e., by input energy
Amount and output energy are all converted into standard coal and the fractional energy savings of region cold, heat and power triple supply system are calculated, and calculation formula is such as
Under：
Wherein：A consumes standard coal, unit by the output phase with the conventional energy supplying system of quantity product：kgce；
B inputs standard coal, unit for region cold, heat and power triple supply system：kgce；
ΔqpFor region cold, heat and power triple supply system fractional energy savings, unit：%.
And similarly there are the above-mentioned primary energy consumption saving rate calculating methods based on the first law of thermodynamics for the variant form
Existing same problem.
2. based on the second law of thermodynamicsEfficiency comparative's method, it is specific as follows：
This is based on the second law of thermodynamicsEfficiency comparative's method refers to do work ability with theoretical maximum uniformly to weigh area
After a variety of inputs of domain cold, heat and power triple supply system, output energy, exported using region cold, heat and power triple supply system totalWith input
AlwaysRatio as systemEfficiency, then by it with the output phase with the conventional energy supplying system of quantity productEfficiency comparative, from
And obtain project fractional energy savings.Calculation formula is as follows：
Wherein：ηCCHPFor region cold, heat and power triple supply systemEfficiency, unit：%；
ηCHPSDuring for cool and thermal power point productionEfficiency, unit：%；
Qheat_loadFor region cold, heat and power triple supply system heating load, unit：kWh；
Qcooling_loadFor region cold, heat and power triple supply system semen donors, unit：kWh；
PelFor region cold, heat and power triple supply system generated energy, unit：kWh；
QinFor region cold, heat and power triple supply system input energy, unit：kWh；
AHFor region cold, heat and power triple supply system heating loadValue coefficient；
ACFor region cold, heat and power triple supply system semen donorsValue coefficient；
AEFor region cold, heat and power triple supply system generated energyValue coefficient；
ABOFor gas fired-boilerValue coefficient；
ACHFor electric refrigeratorValue coefficient；
ΔqpFor region cold, heat and power triple supply system fractional energy savings, %.
This is based on the second law of thermodynamicsEfficiency comparative's method has adopted a correct attitude towards hot and cold, electric three kinds of non-equivalence, but
Calculating process is extremely complex, and there is also some problems, i.e., energy saving using this method zoning cold, heat and power triple supply system
During rate, since the benchmark for weighing h and c is different, cause coldAnd heatIt is difficult to select unified reference atmosphere, that is, is difficult to weigh
CalorimetricOn the basis of go to weigh again it is cold
And reality also there are the situations of region cold, heat and power triple supply system heat outputting and electric two kinds of energy, this is based on
The second law of thermodynamicsEfficiency comparative's method is set up, and when region cold, heat and power triple supply system only exports cold, electric two kinds of energy
When, it calculates coldWith calculating chemistry of fuelIt can still face and select unified reference atmosphere problem.It therefore, should be based on thermodynamics the
Two lawsEfficiency comparative's method is only applicable to the region cold, heat and power triple supply system under supplying thermal condition, such as cogeneration units.
3. equivalent performance indicator method, specific as follows：
The equivalent performance indicator method refers to assume several energy conversion performance indicators and the reference of input and output
When dividing production system identical, what is calculated is left a kind of product using energy source performance indicator.Although this method calculating process compared with
To be simple, but there are no small defects：That is, the benefit that region cold, heat and power triple supply system is brought all be attributed to it is hot and cold,
Any one electric energy, and subjectively think do not have any influence to other energy, thus the energy-saving benefit deviation calculated compared with
Greatly.
In conclusion 3 kinds of computational methods under the prior art are for the energy saving of zoning cold, heat and power triple supply system
During rate, there is the shortcomings that respectively different or accurately the fractional energy savings of zoning cold, heat and power triple supply system or cannot lead to
It crosses energy saving of system rate and finds there are problems that unified reference atmosphere causes to answer in the cold, heat and power triple supply system integrating process of region
It is narrow or even also have the problem of energy-saving benefit deviation that calculates is larger with face.
Therefore, 3 kinds of fractional energy savings algorithms under the prior art and its derivative algorithm are not suitable for region cold, heat and electricity triple supply
System, thus there is an urgent need to one kind can reflect the true fractional energy savings of cold, heat and power triple supply system and algorithm, Er Qiexu
Want result of calculation accurate, wide usage is strong.
Invention content
In order to solve the variety of problems present in the fractional energy savings algorithm under the prior art, present invention incorporates region cool and thermal powers
By summarizing and exploring, it is cold and hot to provide a kind of region for considering different operating modes for combined supply system energy production and consumption feature
Electric trilogy supply fractional energy savings fast arithmetic, this method can quickly and the fractional energy savings of accurate zoning cold, heat and electricity triple supply be passed through
It facts have proved it is effective, filled up the blank of domestic and international true and accurate zoning cold, heat and power triple supply system fractional energy savings, and
And region cold, heat and power triple supply system is divided into two kinds of operating modes, i.e. supplying thermal condition and cooling operating mode by the algorithm, and in both works
Its fractional energy savings is calculated under condition respectively, however supplying thermal condition fractional energy savings and cooling operating mode fractional energy savings are subjected to certain combination again and calculated,
It can obtain accurate energy saving of system rate.
A kind of region cold, heat and electricity triple supply fractional energy savings fast arithmetic of the different operating modes of consideration of the present invention, specific steps are such as
It is lower described：
1. a kind of region cold, heat and electricity triple supply fractional energy savings fast arithmetic for considering different operating modes, including what is carried out in order
Reference atmosphere andCalculating, frame of reference determine, supplying thermal condition fractional energy savings calculate, cooling operating mode fractional energy savings calculate and it is comprehensive
It closes fractional energy savings and calculates totally 5 parts, be as follows described：
1)Reference atmosphere andCalculating, it is as follows：
Since a kind of region cold, heat and electricity triple supply fractional energy savings fast arithmetic of the different operating modes of consideration of the present invention must comply with
Law of conservation of energy and the second law of thermodynamics, therefore will calculate firstAccording to the usual institute of region cold, heat and power triple supply system
Locate environment, if temperature is 298.15K i.e. 25 DEG C, pressure is that 1 megapascal is calculatingReference atmosphere, under the reference atmosphere,
Calculating formula it is as follows：
1.1) it is electricQuantity equal to electric energy is multiplied by 3.6 million cokes.
1.2) chemistry of fuelUsing western river approximate calculation formula 2, the Lower heat value for being approximately equal to fuel (sets this city natural gas
Lower heat value for it is 50,000,000 burnt/kilogram, about 8500 kilocalories/cubic metre.
1.3) heatValue coefficient is calculated using following equation：
In formula：T0On the basis of environment temperature, unit：K, i.e. Kelvin, similarly hereinafter；
ThFor heat supply temperature, unit：K；
AHFor heatValue coefficient；
2) frame of reference is determining, as follows：
On the basis of investigation large number of equipment or system, choose frame of reference and its calculating factor is as follows：
2.1) heat caused by the cold, heat and power triple supply system of region is provided by gas fired-boiler.It is built according to national correlation is public
Energy conservation standard is built, the thermal efficiency of gas fired-boiler is not less than 92%；
2.2) cold is provided by electric refrigerator group caused by the cold, heat and power triple supply system of region.According to existing large-scale electricity
Dynamic refrigeration unit practical operation situation, if the COP of electric refrigerator group is 5.5；
2.3) electricity caused by the cold, heat and power triple supply system of region with reference to power plant through power grid by providing, power grid transmission ＆ distribution efficiency
About 94%.Due to region cold, heat and power triple supply system generated electricity using valuable natural gas, heat supply, cooling, selection
Power generation references object is gas-steam combined cycle set, and comprehensive electric generating efficiency is about 55%；
3) supplying thermal condition fractional energy savings calculates, as follows：
Under supplying thermal condition, region cold, heat and power triple supply system is by distributing-supplying-energy system and gas fired-boiler co-production energy
Amount.According to the definition of the second law of thermodynamics, during the cold, heat and power triple supply system supplying thermal condition of regionEfficiency calculation formula is such as
Under
Wherein, the denominator of formula 1 is the amount of natural gas of input area cold, heat and power triple supply system and gas fuel chemistry
Product, molecule is output area cold, heat and power triple supply systemWith the product of 3.6 million cokes/kilowatt hour；The denominator of formula 2 is defeated
Enter with reference to the amount of natural gas of boiler and reference power plant and gas fuel chemistryProduct, molecule be output area cool and thermal power three
Co-feeding systemWith the product of 3.6 million cokes/kilowatt hour；
Under the same conditions, the region cold, heat and power triple supply system fractional energy savings calculation formula under supplying thermal condition is such as output
Under：
In above-mentioned formula：
ηCHPFor region cold, heat and power triple supply system supplying thermal conditionEfficiency, nondimensional number；
ηHPDuring for thermoelectricity point productionEfficiency, nondimensional number；
QheatFor region cold, heat and power triple supply system heating load, kWh；
Pel_hFor region cold, heat and power triple supply system generated energy, unit under supplying thermal condition：kWh；
Δqp_hFor region cold, heat and power triple supply system fractional energy savings, nondimensional number under supplying thermal condition.
Xgas_en_heatAmount of natural gas (heat supply), unit are inputted for prime mover：kg；
Xgas_boAmount of natural gas, unit are inputted for region cold, heat and power triple supply system boiler：kg；
Xgas_boBoiler inputs amount of natural gas, unit during for thermoelectricity point production：kg；
XelPlant gas inputs amount of natural gas, unit during for thermoelectricity point production：kg；
AHFor region cold, heat and power triple supply system heating loadValue coefficient, nondimensional number；
ηboilerFor the gas fired-boiler thermal efficiency, nondimensional number；
4) cooling operating mode fractional energy savings calculates, as follows：
Region cold, heat and power triple supply system electrical chillers and absorption refrigeration unit when producing same parameter equivalent cold energy,
The twoEfficiency is basically identical, i.e., individually weighs coldWhen can use same reference atmosphere, therefore, can be by Absorption Refrigerator
The production capacity amount of group is converted into the equivalent electric quantity of electrical chillers, the other energy generated without influence area cold, heat and power triple supply system
Amount.Related translation method is as follows：
If region cold, heat and power triple supply system prime mover drives absorption system caused by after power generation using excess heat
The cold that cold obtains is COPaQhIf the cold is generated by electric refrigerator, the power consumption needed is COPaQh/COPe,
Absorption Refrigerator equivalent generated energy when the power consumption can regard combined cooling and power as.Wherein, COPaFor absorption refrigeration unit
The coefficient of performance, COPeFor the electric refrigerator group coefficient of performance, QhFor prime mover generated after power generation using excess heat；According to
Existing fume hot-water type cold/hot water machine of lithium bromide group index of correlation, the COP of utilizing waste heat for refrigeration is about 1；After above-mentioned conversion,
Region cold, heat and power triple supply system fractional energy savings under cooling operating mode calculates as follows：
Wherein：ηCCPFor cold, heat and power triple supply system equivalent electrical efficiency in region under cooling operating mode；
ηCPFor plant gas generating efficiency and the product of power grid transmission ＆ distribution efficiency；
ηeFor region cold, heat and power triple supply system distributing-supplying-energy system generating efficiency；
QhFor prime mover generated after power generation using excess heat；
QinHeat is inputted for prime mover；
Δqp_cFor region cold, heat and power triple supply system fractional energy savings under cooling operating mode；
COPaFor the absorption refrigeration unit coefficient of performance；
COPeFor the electric refrigerator group coefficient of performance；
Above-mentioned steps 4) cooling operating mode fractional energy savings calculate, due under cooling operating mode, region cold, heat and power triple supply system
By distributing-supplying-energy system and electrical chillers co-production cold.Unlike supplying thermal condition, combined power and cooling or cold electricity
Divide in production and be taken from by the energy of electrical chillers production in power grid, and production etc. consistent in electrical chillers coefficient of performance
When measuring cold energy, energy consumption is consistent, therefore, in the case where disregarding region cold, heat and power triple supply system pipe network efficiency of transmission, region
The energy-saving benefit of cold, heat and power triple supply system is unrelated with distributing-supplying-energy system energy supply accounting.Based on the factor, under cooling operating mode
Region cold, heat and power triple supply system energy-saving benefit only need distributing-supplying-energy system in the cold, heat and power triple supply system of contrast district
With the efficiency of energy utilization of separate generation of cooling and power system.But due toReference atmosphere problem, can not be straight under cooling operating mode
It is cold to connect calculatingFor this reason, it may be necessary to get around reference atmosphere problem.
5) synthesis energy saving rate calculates, as follows：
First, region cold, heat and power triple supply system supplying thermal condition amount of energy saving is acquired：
Region cold, heat and power triple supply system cooling operating mode amount of energy saving is acquired again：
Wherein：ECheatFor region cold, heat and power triple supply system supplying thermal condition amount of energy saving, unit：kg.
ECcoolFor region cold, heat and power triple supply system cooling operating mode amount of energy saving, unit：kg.
Xgas_en_coolAmount of natural gas, unit are inputted for prime mover：kg；
Composite type 3 and formula 4, attainable region domain cold, heat and power triple supply system synthesis energy saving benefit are as follows：
With reference to above-mentioned formula, the operating mode of region cold, heat and power triple supply system is correctly demarcated, it will be able to accurate quick
The fractional energy savings of zoning cold, heat and power triple supply system.
Absorption refrigeration unit in step 4) is fume hot-water type lithium bromide absorption refrigerating set.
Using the present invention a kind of different operating modes of consideration region cold, heat and electricity triple supply fractional energy savings fast arithmetic obtain as
Lower advantageous effect：
1. a kind of region cold, heat and electricity triple supply fractional energy savings fast arithmetic of the different operating modes of consideration of the present invention, can quickly simultaneously
The fractional energy savings of accurate zoning cold, heat and electricity triple supply, has filled up domestic and international true and accurate zoning cold, heat and power triple supply system
The blank of fractional energy savings；
2. a kind of region cold, heat and electricity triple supply fractional energy savings fast arithmetic of the different operating modes of consideration of the present invention is cold and hot by region
Electric combined supply system is divided into two kinds of operating modes, i.e. supplying thermal condition and cooling operating mode, and it is energy saving to calculate under both operating modes its respectively
Rate, however supplying thermal condition fractional energy savings and cooling operating mode fractional energy savings are subjected to certain combination again and calculated, obtain accurate energy saving of system
Rate.
Specific embodiment
A kind of region cold, heat and electricity triple supply fractional energy savings of the different operating modes of consideration of the present invention is calculated quickly with reference to embodiment
Method is further described.
Embodiment
A kind of region cold, heat and electricity triple supply fractional energy savings fast arithmetic for considering different operating modes, including what is carried out in order's
Reference atmosphere andCalculating, the determining of frame of reference, supplying thermal condition fractional energy savings calculates, cooling operating mode fractional energy savings calculates and comprehensive
Fractional energy savings calculates totally 5 parts, is as follows described：
1)Reference atmosphere andCalculating, it is as follows：
Since a kind of region cold, heat and electricity triple supply fractional energy savings fast arithmetic of the different operating modes of consideration of the present invention must comply with
Law of conservation of energy and the second law of thermodynamics, therefore will calculate firstAccording to the usual institute of region cold, heat and power triple supply system
Locate environment, if temperature is 298.15K i.e. 25 DEG C, pressure is that 1 megapascal is calculatingReference atmosphere, under the reference atmosphere,
Calculating formula it is as follows：
1.1) it is electricQuantity equal to electric energy is multiplied by 3.6 million cokes.
1.2) chemistry of fuelUsing western river approximate calculation formula 3, the Lower heat value for being approximately equal to fuel (sets this city natural gas
Lower heat value for it is 50,000,000 burnt/kilogram, about 8500 kilocalories/cubic metre.
1.3) heatValue coefficient is calculated using following equation：
In formula：T0On the basis of environment temperature, unit：K, i.e. Kelvin, similarly hereinafter；
ThFor heat supply temperature, unit：K；
AHFor heatValue coefficient；
2) frame of reference is determining, as follows：
On the basis of investigation large number of equipment or system, choose frame of reference and its calculating factor is as follows：
2.1) heat caused by the cold, heat and power triple supply system of region is provided by gas fired-boiler.It is built according to national correlation is public
Energy conservation standard is built, the thermal efficiency of gas fired-boiler is not less than 92%；
2.2) cold is provided by electric refrigerator group caused by the cold, heat and power triple supply system of region.According to existing large-scale electricity
Dynamic refrigeration unit practical operation situation, if the COP of electric refrigerator group is 5.5；
2.3) electricity caused by the cold, heat and power triple supply system of region with reference to power plant through power grid by providing, power grid transmission ＆ distribution efficiency
About 94%.Due to region cold, heat and power triple supply system generated electricity using valuable natural gas, heat supply, cooling, selection
Power generation references object is gas-steam combined cycle set, and comprehensive electric generating efficiency is about 55%；
3) supplying thermal condition fractional energy savings calculates, as follows：
Under supplying thermal condition, region cold, heat and power triple supply system is by distributing-supplying-energy system and gas fired-boiler co-production energy
Amount.According to the definition of the second law of thermodynamics, during the cold, heat and power triple supply system supplying thermal condition of regionEfficiency calculation formula is such as
Under
Wherein, the denominator of formula 1 is the amount of natural gas of input area cold, heat and power triple supply system and gas fuel chemistry
Product, molecule is output area cold, heat and power triple supply systemWith the product of 3.6 million cokes/kilowatt hour；The denominator of formula 2 is defeated
Enter with reference to the amount of natural gas of boiler and reference power plant and gas fuel chemistryProduct, molecule be output area cool and thermal power three
Co-feeding systemWith the product of 3.6 million cokes/kilowatt hour；
Under the same conditions, the region cold, heat and power triple supply system fractional energy savings calculation formula under supplying thermal condition is such as output
Under：
In above-mentioned formula：
ηCHPFor region cold, heat and power triple supply system supplying thermal conditionEfficiency, nondimensional number；
ηHPDuring for thermoelectricity point productionEfficiency, nondimensional number；
QheatFor region cold, heat and power triple supply system heating load, kWh；
Pel_hFor region cold, heat and power triple supply system generated energy, unit under supplying thermal condition：kWh；
Δqp_hFor region cold, heat and power triple supply system fractional energy savings, nondimensional number under supplying thermal condition.
Xgas_en_heatAmount of natural gas (heat supply), unit are inputted for prime mover：kg；
Xgas_boAmount of natural gas, unit are inputted for region cold, heat and power triple supply system boiler：kg；
X’gas_boBoiler inputs amount of natural gas, unit during for thermoelectricity point production：kg；
XelPlant gas inputs amount of natural gas, unit during for thermoelectricity point production：kg；
AHFor region cold, heat and power triple supply system heating loadValue coefficient, nondimensional number；
ηboilerFor the gas fired-boiler thermal efficiency, nondimensional number；
4) cooling operating mode fractional energy savings calculates, as follows：
Region cold, heat and power triple supply system electrical chillers and absorption refrigeration unit when producing same parameter equivalent cold energy,
The twoEfficiency is basically identical, i.e., individually weighs coldWhen can use same reference atmosphere, therefore, can be by Absorption Refrigerator
The production capacity amount of group is converted into the equivalent electric quantity of electrical chillers, the other energy generated without influence area cold, heat and power triple supply system
Amount.Related translation method is as follows：
If region cold, heat and power triple supply system prime mover drives absorption system caused by after power generation using excess heat
The cold that cold obtains is COPaQhIf the cold is generated by electric refrigerator, the power consumption needed is COPaQh/COPe,
Absorption Refrigerator equivalent generated energy when the power consumption can regard combined cooling and power as.Wherein, COPaFor absorption refrigeration unit
The coefficient of performance, COPeFor the electric refrigerator group coefficient of performance, QhFor prime mover generated after power generation using excess heat；According to
Existing fume hot-water type cold/hot water machine of lithium bromide group index of correlation, the COP of utilizing waste heat for refrigeration is about 1；After above-mentioned conversion,
Region cold, heat and power triple supply system fractional energy savings under cooling operating mode calculates as follows：
Wherein：ηCCPFor cold, heat and power triple supply system equivalent electrical efficiency in region under cooling operating mode；
ηCPFor plant gas generating efficiency and the product of power grid transmission ＆ distribution efficiency；
ηeFor region cold, heat and power triple supply system distributing-supplying-energy system generating efficiency；
QhFor prime mover generated after power generation using excess heat；
QinHeat is inputted for prime mover；
Δqp_cFor region cold, heat and power triple supply system fractional energy savings under cooling operating mode；
COPaFor the absorption refrigeration unit coefficient of performance；
COPeFor the electric refrigerator group coefficient of performance；
Above-mentioned steps 4) cooling operating mode fractional energy savings calculate, due under cooling operating mode, region cold, heat and power triple supply system
By distributing-supplying-energy system and electrical chillers co-production cold.Unlike supplying thermal condition, combined power and cooling or cold electricity
Divide in production and be taken from by the energy of electrical chillers production in power grid, and production etc. consistent in electrical chillers coefficient of performance
When measuring cold energy, energy consumption is consistent, therefore, in the case where disregarding region cold, heat and power triple supply system pipe network efficiency of transmission, region
The energy-saving benefit of cold, heat and power triple supply system is unrelated with distributing-supplying-energy system energy supply accounting.Based on the factor, under cooling operating mode
Region cold, heat and power triple supply system energy-saving benefit only need distributing-supplying-energy system in the cold, heat and power triple supply system of contrast district
With the efficiency of energy utilization of separate generation of cooling and power system.But due toReference atmosphere problem, can not be straight under cooling operating mode
It is cold to connect calculatingFor this reason, it may be necessary to get around reference atmosphere problem.
5) synthesis energy saving rate calculates, as follows：
First, region cold, heat and power triple supply system supplying thermal condition amount of energy saving is acquired：
Region cold, heat and power triple supply system cooling operating mode amount of energy saving is acquired again：
Wherein：ECheatFor region cold, heat and power triple supply system supplying thermal condition amount of energy saving, unit：kg.
ECcoolFor region cold, heat and power triple supply system cooling operating mode amount of energy saving, unit：kg.
Xgas_en_coolAmount of natural gas, unit are inputted for prime mover：kg；
Composite type 3 and formula 4, attainable region domain cold, heat and power triple supply system synthesis energy saving benefit are as follows：
With reference to above-mentioned formula, the operating mode of region cold, heat and power triple supply system is correctly demarcated, it will be able to accurate quick
The fractional energy savings of zoning cold, heat and power triple supply system.
Absorption refrigeration unit in step 4) is fume hot-water type lithium bromide absorption refrigerating set.
A kind of region cold, heat and electricity triple supply fractional energy savings fast arithmetic of the different operating modes of consideration of the present invention, can be quickly and accurate
The fractional energy savings of true zoning cold, heat and electricity triple supply, has filled up domestic and international true and accurate zoning cold, heat and power triple supply system section
The blank of energy rate；Region cold, heat and power triple supply system is divided into two kinds of operating modes, i.e. supplying thermal condition and cooling operating mode by the present invention, and
Its fractional energy savings is calculated under both operating modes respectively, however supplying thermal condition fractional energy savings and cooling operating mode fractional energy savings are carried out certain group again
It is total to calculate, obtain accurate energy saving of system rate.
Claims (2)
1. a kind of region cold, heat and electricity triple supply fractional energy savings fast arithmetic for considering different operating modes, including what is carried out in orderBase
Quasi andCalculating, the determining of frame of reference, supplying thermal condition fractional energy savings calculates, cooling operating mode fractional energy savings calculates and comprehensive section
Energy rate calculates totally 5 parts, is as follows described：
1)Reference atmosphere andCalculating, it is as follows：
Since a kind of region cold, heat and electricity triple supply fractional energy savings fast arithmetic of the different operating modes of consideration of the present invention must comply with energy
Law of conservation and the second law of thermodynamics, therefore will calculate firstAccording to the usually residing ring of region cold, heat and power triple supply system
Border, if temperature is 298.15K i.e. 25 DEG C, pressure is that 1 megapascal is calculatingReference atmosphere, under the reference atmosphere,Meter
Formula is as follows：
1.1) it is electricQuantity equal to electric energy is multiplied by 3.6 million cokes.
1.2) chemistry of fuelUsing western river approximate calculation formula 1, the Lower heat value for being approximately equal to fuel (sets this city natural gas low level
Calorific value for it is 50,000,000 burnt/kilogram, about 8500 kilocalories/cubic metre.
1.3) heatValue coefficient is calculated using following equation：
In formula：T0On the basis of environment temperature, unit：K, i.e. Kelvin, similarly hereinafter；
ThFor heat supply temperature, unit：K；
AHFor heatValue coefficient；
2) frame of reference is determining, as follows：
On the basis of investigation large number of equipment or system, choose frame of reference and its calculating factor is as follows：
2.1) heat caused by the cold, heat and power triple supply system of region is provided by gas fired-boiler.According to national related public building section
Energy standard, the thermal efficiency of gas fired-boiler are not less than 92%；
2.2) cold is provided by electric refrigerator group caused by the cold, heat and power triple supply system of region.According to existing Large Electric system
Cold group practical operation situation, if the COP of electric refrigerator group is 5.5；
2.3) by being provided with reference to power plant through power grid, power grid transmission ＆ distribution efficiency is about electricity caused by the cold, heat and power triple supply system of region
94%.Due to region cold, heat and power triple supply system generated electricity using valuable natural gas, heat supply, cooling, selection power generation
References object is gas-steam combined cycle set, and comprehensive electric generating efficiency is about 55%；
3) supplying thermal condition fractional energy savings calculates, as follows：
Under supplying thermal condition, region cold, heat and power triple supply system is by distributing-supplying-energy system and gas fired-boiler co-production energy.It presses
According to the definition of the second law of thermodynamics, during the cold, heat and power triple supply system supplying thermal condition of regionEfficiency calculation formula is as follows
Wherein, the denominator of formula 1 is the amount of natural gas of input area cold, heat and power triple supply system and gas fuel chemistryMultiply
Product, molecule are output area cold, heat and power triple supply systemWith the product of 3.6 million cokes/kilowatt hour；The denominator of formula 2 is joined for input
Examine boiler and amount of natural gas and gas fuel chemistry with reference to power plantProduct, molecule be output area cold, heat and electricity triple supply
SystemWith the product of 3.6 million cokes/kilowatt hour；
Under the same conditions, the region cold, heat and power triple supply system fractional energy savings calculation formula under supplying thermal condition is as follows for output：
In above-mentioned formula：
ηCHPFor region cold, heat and power triple supply system supplying thermal conditionEfficiency, nondimensional number；
ηHPDuring for thermoelectricity point productionEfficiency, nondimensional number；
QheatFor region cold, heat and power triple supply system heating load, kWh；
Pel_hFor region cold, heat and power triple supply system generated energy, unit under supplying thermal condition：kWh；
Δqp_hFor region cold, heat and power triple supply system fractional energy savings, nondimensional number under supplying thermal condition.
Xgas_en_heatAmount of natural gas (heat supply), unit are inputted for prime mover：kg；
Xgas_boAmount of natural gas, unit are inputted for region cold, heat and power triple supply system boiler：kg；
X′gas_boBoiler inputs amount of natural gas, unit during for thermoelectricity point production：kg；
XelPlant gas inputs amount of natural gas, unit during for thermoelectricity point production：kg；
AHFor region cold, heat and power triple supply system heating loadValue coefficient, nondimensional number；
ηboilerFor the gas fired-boiler thermal efficiency, nondimensional number；
4) cooling operating mode fractional energy savings calculates, as follows：
Region cold, heat and power triple supply system electrical chillers and absorption refrigeration unit are when producing same parameter equivalent cold energy, the two
'sEfficiency is basically identical, i.e., individually weighs coldWhen can use same reference atmosphere, therefore, can be by the production of absorption refrigeration unit
Energy is converted into the equivalent electric quantity of electrical chillers, the other energy generated without influence area cold, heat and power triple supply system.Phase
It is as follows to close translation method：
If region cold, heat and power triple supply system prime mover drives Absorption Refrigerator caused by after power generation using excess heat
Obtained cold is COPaQhIf the cold is generated by electric refrigerator, the power consumption needed is COPaQh/COPe, the consumption
Absorption Refrigerator equivalent generated energy when electricity can regard combined cooling and power as.Wherein, COPaFor absorption refrigeration unit performance
Coefficient, COPeFor the electric refrigerator group coefficient of performance, QhFor prime mover generated after power generation using excess heat；According to existing
Fume hot-water type cold/hot water machine of lithium bromide group index of correlation, the COP of utilizing waste heat for refrigeration is about 1；After above-mentioned conversion, cooling
Region cold, heat and power triple supply system fractional energy savings under operating mode calculates as follows：
Wherein：ηCCPFor cold, heat and power triple supply system equivalent electrical efficiency in region under cooling operating mode；
ηCPFor plant gas generating efficiency and the product of power grid transmission ＆ distribution efficiency；
ηeFor region cold, heat and power triple supply system distributing-supplying-energy system generating efficiency；
QhFor prime mover generated after power generation using excess heat；
QinHeat is inputted for prime mover；
Δqp_cFor region cold, heat and power triple supply system fractional energy savings under cooling operating mode；
COPaFor the absorption refrigeration unit coefficient of performance；
COPeFor the electric refrigerator group coefficient of performance；
5) synthesis energy saving rate calculates, as follows：
First, region cold, heat and power triple supply system supplying thermal condition amount of energy saving is acquired：
Region cold, heat and power triple supply system cooling operating mode amount of energy saving is acquired again：
Wherein：ECheatFor region cold, heat and power triple supply system supplying thermal condition amount of energy saving, unit：kg.
ECcoolFor region cold, heat and power triple supply system cooling operating mode amount of energy saving, unit：kg.
Xgas_en_coolAmount of natural gas, unit are inputted for prime mover：kg；
Composite type 3 and formula 4, attainable region domain cold, heat and power triple supply system synthesis energy saving benefit are as follows：
With reference to above-mentioned formula, the operating mode of region cold, heat and power triple supply system is correctly demarcated, it will be able to it is cold to calculate region
The fractional energy savings of thermoelectricity combined supply system.
2. a kind of region cold, heat and electricity triple supply fractional energy savings fast arithmetic for considering different operating modes as described in claim 1, special
Sign is that the absorption refrigeration unit in the step 4) is fume hot-water type lithium bromide absorption refrigerating set.
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