CN105426678B - The thermal efficiency indices analysis method of Distribution of Natural formula energy source station run the period - Google Patents
The thermal efficiency indices analysis method of Distribution of Natural formula energy source station run the period Download PDFInfo
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- 238000004458 analytical method Methods 0.000 title claims description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000000446 fuel Substances 0.000 claims abstract description 39
- 239000003345 natural gas Substances 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000010977 unit operation Methods 0.000 claims abstract description 6
- 230000005611 electricity Effects 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 29
- 238000010248 power generation Methods 0.000 claims description 27
- 238000002485 combustion reaction Methods 0.000 claims description 15
- 238000004364 calculation method Methods 0.000 claims description 13
- 238000004378 air conditioning Methods 0.000 claims description 7
- 239000003245 coal Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 230000000704 physical effect Effects 0.000 claims description 6
- 238000005265 energy consumption Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 3
- 241001269238 Data Species 0.000 abstract 1
- 238000005057 refrigeration Methods 0.000 abstract 1
- 230000005619 thermoelectricity Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000000605 extraction Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
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Abstract
The invention discloses a kind of method of analyzing thermal of Distribution of Natural formula energy source station run the period, including：Annual 12 months in the corresponding engineering location specific time typical day meteorological datas are collected, and determine the meteorologic parameter of the typical day；It determines cooling and heating load when Distribution of Natural formula energy source station unit typical case's every month whole year day typical case, and determines the physical parameter of natural gas；Meteorologic parameter corresponding to run the period according to unit calculates output and efficiency of the unit under various meteorological conditions；According to the relationship of the rate of load condensate of unit variable load operation and efficiency, the gross capability and total fuel consumption of unit variable load operation period when calculating typical day typical case；According to the total fuel consumption and gross generation of unit operation mode computation whole year；Calculate Distribution of Natural formula energy source station whole year thermal efficiency indices and electricity cost allocation index.The present invention makes thermoelectricity refrigeration duty and the user demand characteristic best match of design unit, can reach higher energy utilization rate.
Description
Technical Field
The invention relates to a method for analyzing thermal economy indexes of a natural gas distributed energy resource station in an operation period.
Background
In order to improve the economic level of operation of the natural gas distributed energy unit, the economic efficiency of a thermodynamic system of the unit is analyzed in the early design stage of a project, an optimal system design scheme matched with the cold and heat load change characteristics is preferably selected, and the heat economic parameters are the main basis for analyzing the heat economic efficiency. Therefore, whether the thermal economy index parameters can be accurately analyzed and calculated has important influence on system design and unit model selection in the project design stage.
At present, the calculation of the thermal economic index of the domestic natural gas distributed energy station does not form a complete analysis calculation method of the system, a 'cogeneration' thought is applied, the designed energy station load simply covers the requirement range of a user, and the operation efficiency and the energy utilization rate of a unit cannot be taken into consideration, so that the actual operation scale after the unit is built is large, the serious consequences of low operation efficiency and low energy utilization rate of the unit are caused by long-term low-load operation, and the superiority of the distributed energy system is difficult to embody.
Disclosure of Invention
The invention aims to provide a method for analyzing thermal economic index of a natural gas distributed energy station in an operating period so as to solve the defects in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for analyzing thermal economy indexes of a natural gas distributed energy resource station in an operation period comprises the following steps:
collecting typical weather data of 12 months per year in a specific year of a corresponding engineering place, and determining weather parameters of the typical day;
determining the cold and heat load of the natural gas distributed energy station unit at the typical time of each month and each typical day of the whole year, and determining the physical property parameters of the natural gas;
thirdly, calculating the output and efficiency of the unit under various meteorological conditions according to the meteorological parameters corresponding to the operation time period of the unit;
step four, calculating the total output and the total fuel consumption of the unit in the variable load operation time period in the typical day according to the relation between the load rate and the efficiency of the unit in variable load operation;
step five, calculating the total fuel consumption and the total power generation of the whole year according to the unit operation mode;
and step six, calculating the annual heat economy index and the thermoelectric apportionment index of the natural gas distributed energy station.
The calculation process of the cold and heat load in the second step is as follows: performing annual energy consumption analysis on the building air conditioning system according to the typical weather parameters determined in the step one, and calculating space-by-space air conditioning loads; according to the heating design specification and the hourly meteorological data of 8760 hours in 365 days all the year, respectively carrying out 24-hour load calculation on 365 design days all the year.
The physical property parameter calculation process of the natural gas in the second step is as follows: calculating the molar calorific value of the ideal gas; calculating the ideal mass heating value of the mixture according to the ideal gas molar heating value and the molar mass of the corresponding mixture; and calculating the ideal gas volume heating value according to the molar heating value of the ideal gas and the metering reference condition.
The output and efficiency of the computer set in the third step under various meteorological conditions comprise the steps of calculating the mass consumption or the volume consumption in unit time of fuel of a single combustion engine in a specific time period, calculating the mass consumption or the volume consumption in unit time of fuel of a whole plant combustion engine in the specific time period, calculating the heat input into the single combustion engine in unit time, calculating the power consumption of a compressor of the single combustion engine, and calculating the heat supply of the single steam engine.
Calculating the total output and the total fuel consumption of the unit variable load operation period in the typical time of the typical day in the fourth step comprises calculating the total heating load of the whole plant in the specific period, calculating the power generation amount of the whole plant in the specific period, calculating the power generation fuel cost ratio in the specific period, calculating the heat supply fuel cost ratio in the specific period, calculating the fuel mass consumption of the whole plant in the specific period in unit time, calculating the fuel volume consumption of the whole plant in the specific period in unit time, calculating the power generation volume consumption of the whole plant in the specific period in unit time, calculating the heat supply volume consumption of the whole plant in the specific period in unit time, calculating the total fuel mass consumption of the whole plant in the specific period, calculating the total power generation fuel volume consumption of the whole plant in the specific period, calculating the total heat supply fuel volume consumption of the whole plant in the specific period, calculating the power generation gas consumption rate in.
Calculating the annual total fuel consumption and the annual total power generation in the fifth step comprises calculating an annual average power generation fuel cost ratio, calculating an annual average heat supply fuel cost ratio, calculating annual power generation of the whole plant, calculating annual power generation utilization hours of the whole plant, calculating annual heat supply, calculating power consumption of the power generation plant, calculating annual power supply and calculating annual power consumption.
Calculating the annual heat economy index and the thermoelectric apportionment index of the natural gas distributed energy station in the sixth step comprises calculating annual power generation gas consumption, calculating annual heat supply gas consumption, calculating annual average power generation gas consumption rate, calculating annual average heat supply steam consumption rate, calculating annual average power generation standard coal consumption, calculating annual average power supply standard coal consumption, calculating annual average heat supply standard coal consumption, calculating power generation heat efficiency, calculating plant thermoelectric ratio, and calculating annual equipment utilization hours.
The invention has the beneficial effects that:
the invention relates to a systematic analysis and calculation method for the heat economy of a distributed energy station, which takes the maximization of energy utilization as a final target, and has the main advantages that the heat, electricity and cold loads of a designed unit are optimally matched with the characteristics of user requirements, the characteristic of user requirement up is fully reflected, and the higher energy utilization rate can be achieved compared with the traditional design idea of distributed energy. The method is mainly applied to the distributed energy project design stage, can accurately predict the operation condition of the unit after being built in the early stage of the project, and has important guiding significance for the design optimization of the distributed energy system scheme.
The method combines the meteorological parameters such as temperature, humidity and air pressure of the natural gas distributed energy project location and the cooling, heating and power load conditions, calculates the thermal economy index of the natural gas distributed energy station in any time period or all the year in the project early design stage, comprehensively calculates and evaluates the indexes such as thermal efficiency, generated energy, electricity generation utilization hours, air consumption and the like of different unit matching schemes, can be used for optimizing the optimal system design scheme matched with the cooling, heating and power load change characteristics, and provides decision basis for project investment.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
The method for analyzing the thermal economy index of the natural gas distributed energy resource station in the operating period comprises the following steps:
collecting typical daily weather data of 12 months per year in a specific year of a corresponding engineering place, and determining weather parameters such as air temperature, humidity and air pressure of the typical day.
And step two, determining the cold and heat load of the natural gas distributed energy station unit at the typical time of each month and each typical day of the whole year, and determining the physical parameters of the natural gas.
(1) Calculation of cold and heat load
And (4) according to the meteorological data collected in the step one, adopting the existing HDY-SMAD series air-conditioning load calculation and analysis software to carry out annual energy consumption analysis on the building air-conditioning system, and calculating space-by-space air-conditioning load. And carrying out 24-hour load calculation on 365 design days in total in 365 days in the year according to an algorithm provided by the latest heating design specification and the hourly meteorological data of 8760 hours in 365 days in the year.
(2) Calculation of physical Properties of Natural gas
Physical properties of natural gas according to combustion reference conditions (t)1，p1) And metering reference conditions (t)2，p2) And calculating each molar component, and checking whether the molar fraction of each component meets the requirement, if the known natural gas component is the volume fraction, converting the known natural gas component into the molar fraction, wherein the conversion formula is as follows:
in the formula: xj-the mole fraction of component j;
-the volume fraction of component j;
Zj(t2,p2) Component j in natural gas metering reference conditions (t)2，p2) The compression factor of.
A. The ideal gas molar calorific value (high or low), the pressure p, is calculated according to the following formula1＝p2＝101.325kP。
WhereinIs the molar calorific value of component j.
B. From the ideal gas molar calorific value and the molar mass of the corresponding mixture, the ideal mass calorific value (upper or lower) of the mixture can be calculated by the following calculation formula:
wherein M isjIs the molar mass of component j.
T can be calculated according to the above formula1Ideal gas mass heating value (this value is related to combustion reference pressure p) at 25 ℃, 20 ℃, 15 ℃ and 0 ℃1Irrelevant), the true gas mass heating value and the corresponding ideal gas mass heating value are also considered to be equal in value.
C. According to the molar calorific value of ideal gas and metering reference condition (t)2，p2) The ideal gas volume heating value (high or low) can be calculated by the following formula:
wherein, the gas molar constant R is 8.31451J/(mol K); absolute temperature T2＝t2+273.15(K)。
Thirdly, calculating the output and efficiency of the unit under various meteorological conditions according to meteorological parameters corresponding to the operation time period of the unit, namely the output and efficiency in each season (mainly used when calculating the total economic parameters of the whole year, namely the temperature and the atmospheric pressure, and the output and the efficiency of the unit are influenced because the parameters in different seasons and different months are different); the method comprises the following steps:
calculating the mass consumption of fuel of a single combustion engine in a specific time periodOr volume consumption per unit timeThe calculation formula is as follows:
wherein P isijFor a single cycle power (kW), q of the combustion engine per time periodijHeat rate per cycle (kJ/kWh), H, for a combustion enginemThe fuel quality is low calorific value (kJ/kg), HvIs the low calorific value (kJ/Nm) of the fuel volume3) (ii) a Density of fuelThe three can be mutually converted, and the whole operation period is constant.
Calculating heat supply of single steam engine
Wherein,the high-pressure extraction steam quantity (t/h),is the enthalpy value (kJ/kg) of high-pressure extraction steam,for the enthalpy value (kJ/kg) of water supplement,the low-pressure extraction steam quantity (t/h),the enthalpy value of low-pressure extraction steam (kJ/kg),the enthalpy value (kJ/kg) of the heating return water,for the amount of hot water supply (t/h),for a hot water supply enthalpy value (kJ/kg),return water enthalpy value (kJ/kg), n, for hot water supplyijThe number of combustion engines for a single unit is increased.
Step four, calculating the total output and the total fuel consumption of the unit variable load operation time interval in the typical day of the typical day according to the relationship between the load rate and the efficiency of the unit variable load operation, wherein the unit operation condition in a certain day in a month in the typical day can represent the average operation condition of the month and has typicality, and the unit operation condition in a certain hour in a day in the typical day can represent the average operation condition of the day and has typicality; the method comprises the following steps:
calculating a specific time period heating fuel cost ratio
Step five, calculating the total fuel consumption and the total power generation of the whole year according to the unit operation mode; the method comprises the following steps:
calculating the annual electricity generation utilization hours of the whole plant Unit: h, wherein PeThe rated power (kW/h) of the whole plant.
Calculating the power consumption delta of the power plante：Unit: percent, wherein delta is the comprehensive plant power rate (%).
Step six, calculating an annual heat economy index and a thermoelectric apportionment index of the natural gas distributed energy station; the method comprises the following steps:
calculating annual power generation gas consumption
Calculating annual heat and gas consumption
Calculating annual equipment utilization hours Unit: h, wherein bvRated unit hour volume gas consumption (Nm) for the whole plant3/h)。
Claims (1)
1. A method for analyzing thermal economy indexes of a natural gas distributed energy resource station in an operation period is characterized by comprising the following steps:
collecting typical day meteorological data of 12 months per year in a specific year of a corresponding project location, and determining meteorological parameters of a typical day;
step two, performing annual energy consumption analysis on the building air conditioning system according to the determined typical daily meteorological parameters, and calculating space-by-space air conditioning loads; respectively carrying out 24-hour load calculation on 365 design days in the whole year for 24 hours according to heating design specifications and hourly meteorological data of 8760 hours in 365 days in the whole year; the physical properties of the natural gas are calculated according to combustion reference conditions, metering reference conditions and each mole component, and the physical properties comprise: calculating the molar calorific value of the ideal gas, calculating the ideal mass calorific value of the mixture according to the molar calorific value of the ideal gas and the molar mass of the corresponding mixture, and calculating the volume calorific value of the ideal gas according to the molar calorific value of the ideal gas and the metering reference condition;
step three, calculating the output and efficiency of the unit under various meteorological conditions according to the meteorological parameters corresponding to the operation time period of the unit, wherein the output and efficiency of the unit under various meteorological conditions comprise: calculating the fuel mass consumption or the fuel volume consumption in unit time of a single combustion engine in a specific time period, calculating the fuel mass consumption or the fuel volume consumption in unit time of the whole plant combustion engines in the specific time period, calculating the heat input into the single combustion engine in unit time, calculating the power consumption of a compressor of the single combustion engine, and calculating the heat supply load of the single steam engine;
step four, calculating the total output and the total fuel consumption of the unit variable load operation time period in the typical day according to the relation between the load rate and the efficiency of the unit variable load operation, wherein the step comprises the following steps: calculating total plant heat supply in a specific period, calculating plant power generation in the specific period, calculating a power generation fuel cost ratio in the specific period, calculating a heat supply fuel cost ratio in the specific period, calculating the fuel mass consumption per unit time of the whole plant in the specific period, calculating the fuel volume consumption per unit time of the whole plant in the specific period, calculating the power generation volume consumption per unit time of the whole plant in the specific period, calculating the heat supply volume consumption per unit time of the whole plant in the specific period, calculating the total plant fuel mass consumption per unit time in the specific period, calculating the total plant fuel volume consumption per unit time in the specific period, calculating the total plant heat supply fuel volume consumption per unit time in the specific period, calculating the power generation gas consumption rate in the specific period, and calculating the heat supply gas consumption rate in the specific period;
step five, calculating the annual total fuel consumption and the annual total power generation according to the unit operation mode comprises the following steps: calculating annual average power generation fuel cost ratio, annual average heat supply fuel cost ratio, annual generated energy of the whole plant, annual generated electricity utilization hours of the whole plant, annual heat supply quantity, power consumption of the power plant, annual power supply quantity and annual gas consumption quantity;
step six, calculating the annual heat economy index and the thermoelectric apportionment index of the natural gas distributed energy station comprises the following steps: calculating annual power generation gas consumption, calculating annual heat supply gas consumption, calculating annual average power generation gas consumption rate, calculating annual average heat supply steam consumption rate, calculating annual average power generation standard coal consumption, calculating annual average power supply standard coal consumption, calculating annual average heat supply standard coal consumption, calculating power generation thermal efficiency, calculating plant thermal power ratio, and calculating annual equipment utilization hours.
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| CN114413182A (en) * | 2022-01-30 | 2022-04-29 | 鑫益能科技(厦门)有限公司 | Natural gas monitoring method, device, equipment and medium |
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| 分布式能源天然气负荷分析;詹淑慧 等;《北京建筑工程学院学报》;20120630;第28卷(第2期);第28-31页 * |
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