CN112634525B - Multi-grade heat energy charging method based on return water temperature and time-interval - Google Patents

Multi-grade heat energy charging method based on return water temperature and time-interval Download PDF

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CN112634525B
CN112634525B CN202011402447.3A CN202011402447A CN112634525B CN 112634525 B CN112634525 B CN 112634525B CN 202011402447 A CN202011402447 A CN 202011402447A CN 112634525 B CN112634525 B CN 112634525B
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heat
temperature
time
return water
heat energy
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CN112634525A (en
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黄维
马亮
来婷
黄涛
王晓
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Shaanxi Qidi Ruixing Clean Energy Research Institute Co ltd
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Shaanxi Qidi Ruixing Clean Energy Research Institute Co ltd
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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F15/00—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F15/00—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity
    • G07F15/08—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity with means for varying the tariff or changing the price
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F15/00—Coin-freed apparatus with meter-controlled dispensing of liquid, gas or electricity
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Abstract

The invention provides a multi-grade heat energy charging method based on return water temperature and time intervals. Therefore, the invention can correspondingly change the heat energy charging scheme according to the heat supply requirements of different regions, the actual heat utilization rules of users and the heat supply scheme, and simultaneously mobilize the enthusiasm of thermal power plants, heating power companies and users, thereby realizing the accurate measurement of heat energy with different grades and heat charge in different time periods.

Description

Multi-grade heat energy charging method based on return water temperature and time-interval
Technical Field
The invention belongs to the field of heat supply metering, and particularly relates to a multi-grade heat energy charging method based on return water temperature and time intervals.
Background
The heat energy is an essential energy for modern life and can be used for heating people in life. Thermal power plants use a cogeneration mode of production, the heat energy of which mainly includes steam heat generated by a boiler and waste heat dissipated to the atmosphere through a cooling tower or an air cooling island.
In view of the quality of the heat energy cascade and the difference of the production cost, the steam heat belongs to high-temperature high-grade heat energy, and the heat dissipated to the atmosphere through a water cooling tower or an air cooling island belongs to low-temperature low-grade heat energy. In real life, a thermal power plant delivers heat to a heat supply company, which in turn supplies the heat to users. For heating companies and users, they can only determine the total heat purchased by themselves through a heat meter and pay according to the total heat or the total area, but have no excessive requirements on the quality of the heat used by themselves.
The thermal power plant produces heat energy with different quality, the heating cost is different, and the heat selling price is also different. At present, the thermal power plant carries out unified basic heat price on different grades of heat energy, and the charge fee is not changed along with the difference of the cost. Although the metering method can meter the heat charge, the difference of different grades of heat energy is not considered, the heat can not be distinguished to be low-grade heat energy or high-grade heat energy, and the heat can not be respectively charged according to the different grades of heat energy.
Meanwhile, the cogeneration units of the thermal power plant have different production operation modes at different time periods. When the power consumption of a user is reduced and the power grid is in a low load state, in order to adjust the generated energy, the cogeneration units of the thermal power plant are forced to participate in the peak shaving of the power grid under the working condition of the low load. Because the heat supply capacity and the power supply capacity of the cogeneration unit are mutually influenced, the heat supply capacity of the cogeneration unit is obviously reduced when the power is in low-load operation, so that the heat produced by the thermal power plant cannot meet the heat demand of users, and the contradiction that the power supply is larger than the demand and the heat supply is smaller than the demand occurs. For users, the users want the thermal power plants to supply proper heat according to their actual heat demands, and reduce the use cost while meeting the heat demands. The traditional charging method can not meet the heat demand of a user, is not beneficial to reasonably utilizing energy of a thermal power plant, and improves the heat purchasing cost of the power plant.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a multi-grade heat energy charging method based on return water temperature and time intervals. The technical problem to be solved by the invention is realized by the following technical scheme:
the invention provides a multi-grade heat energy charging method based on return water temperature and time-sharing, which comprises the following steps:
acquiring the water supply temperature of a water supply pipe, the return water temperature of a return water pipe, the specific heat capacity of the mass of hot water flowing through a flowmeter, the starting time of the hot water flowing through the flowmeter, the ending time of the hot water flowing through the flowmeter and the comprehensive correction coefficient of the relative density and the specific heat capacity of the hot water flowing through the flowmeter in the process of producing and supplying each grade of heat energy within a preset time period;
acquiring a unit heat basic heat price;
calculating the heat fee of the heat energy supplied to the heat buying party based on the water supply temperature, the water return temperature, the mass specific heat capacity, the starting time, the ending time, the comprehensive correction coefficient and the unit heat basic heat price;
acquiring temperature correction coefficients and time correction coefficients of production and supply of heat energy of each grade in different time periods within a preset time period;
correcting the heat rate by using the temperature correction coefficient and the time correction coefficient to obtain a corrected heat rate;
the corrected heat rate is as follows:
Figure BDA0002817395880000031
wherein, P represents the corrected heat charge, and the unit is element; p0The unit heat basic heat price is expressed, and the unit is Yuan/GJ; f (t)g,th) Temperature correction coefficients representing different grades of heat energy; f (tau) represents time correction coefficients of different time periods in a preset time period; t is tgThe water supply temperature of the water supply pipe is expressed in units of; t is thThe unit of the return water temperature of a return water pipe of the power plant is; k represents a comprehensive correction coefficient of relative density and specific heat capacity; ρ represents the density of hot water flowing through the flowmeter in kg/m3(ii) a c represents the mass specific heat capacity of hot water, and c is 4178J/(kg. DEG C); q. q.svRepresents the volumetric flow rate of the hot water flowing through the flow meter in m3/s；τ1Representing the starting time of hot water flowing through the flow meter in seconds in divided time periods; tau is2Indicating the end time of hot water flow through the flow meter during the divided time periodThe unit is s; τ denotes a time period.
Optionally, the obtaining of the temperature correction coefficient of each grade of heat energy produced in different time periods within the predetermined time period includes:
determining the minimum value and the maximum value of the return water temperature according to different grades of heat energy, thereby determining the temperature gradient of the return water temperature;
and determining the temperature correction coefficient of each grade of heat energy at each temperature step.
Optionally, the step of determining the temperature step of the return water temperature according to the minimum value and the maximum value of the return water temperatures of different grades of heat energy includes:
determining a backwater temperature interval based on the maximum value and the minimum value of the backwater temperatures of different grades of heat energy;
when the return water temperature of the return water pipe is smaller than the minimum value in the return water temperature range, determining the temperature step of the return water temperature of the return water pipe as a first step;
when the return water temperature of the return water pipe is within the return water temperature range, determining the temperature step of the return water temperature of the return water pipe as a second step;
and when the return water temperature of the return water pipe is greater than the maximum value in the return water temperature range, determining the temperature step of the return water temperature of the return water pipe as a third step.
Optionally, the determining the temperature correction coefficient of each grade heat energy at each temperature step includes:
determining a temperature correction coefficient of each grade of heat energy at each temperature step by using a calculation formula of a temperature correction system, wherein the calculation formula of the temperature correction coefficient is as follows:
Figure BDA0002817395880000041
Figure BDA0002817395880000042
wherein, f (t)h) Indicated at the temperature of the supplied waterWhen the temperature is constant, the temperature correction coefficients of different grades of heat energy are obtained; piThe unit heat price of different grade heat energy calculated by a thermal power plant and a heat buying party is expressed as element/GJ; t is th,maxMaximum value of return water temperature, t, representing each grade of heat energyh,minRepresents the minimum value of the return water temperature of each grade heat energy.
Optionally, the obtaining of the time correction factor for supplying each grade of heat energy at different time periods within a predetermined time period includes:
dividing the time period into a peak time period, a valley time period, and an average time period based on a change in the thermal load;
time correction coefficients for the respective time segments are determined.
Optionally, the determining the time correction coefficient of each time segment includes:
determining the time correction coefficient of each time segment by using a calculation formula of the time correction coefficient, wherein the calculation formula of the time correction coefficient is as follows:
Figure BDA0002817395880000051
Figure BDA0002817395880000052
Figure BDA0002817395880000053
wherein the content of the first and second substances,
Figure BDA0002817395880000054
is divided into
Figure BDA0002817395880000055
And
Figure BDA0002817395880000056
τ is τa、τhAnd τl，
Figure BDA0002817395880000057
The average heat load in unit time in the heat load leveling time period is represented, and the unit is GJ/h;
Figure BDA0002817395880000058
the average heat load in unit time in the heat load peak time period is shown, and the unit is GJ/h;
Figure BDA0002817395880000059
the average heat load in unit time in the heat load valley time period is represented, and the unit is GJ/h;
Figure BDA00028173958800000510
representing a flat time period τaThe cumulative thermal load in GJ;
Figure BDA00028173958800000511
representing the peak time period tauhThe cumulative thermal load in GJ;
Figure BDA00028173958800000512
representing a valley period τlThe cumulative thermal load in GJ; delta tau is divided into taua2-τa1，τh2-τh1And τl2-τl1。
The embodiment of the invention provides a multi-grade heat energy charging method based on return water temperature and time intervals. Therefore, the embodiment of the invention can change the heat charge metering scheme according to the heat demand, the actual heat consumption rule and the heat supply scheme of different regions, realize the accurate metering of heat charges of different grades and different time periods, simultaneously can mobilize the enthusiasm of a thermal power plant, a heat supply company and users, not only realizes energy conservation and consumption reduction, but also promotes the benign development of heat charge metering in the heat supply industry of China.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a flowchart of a multi-grade heat energy charging method based on return water temperature and time intervals according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example one
As shown in fig. 1, a multi-grade heat energy charging method based on return water temperature and time-sharing provided in an embodiment of the present invention includes:
s1, acquiring the water supply temperature of a water supply pipe, the water return temperature of a water return pipe, the mass specific heat capacity of hot water flowing through a flowmeter, the starting time of the hot water flowing through the flowmeter, the ending time of the hot water flowing through the flowmeter and the comprehensive correction coefficient of the relative density and the specific heat capacity of the hot water flowing through the flowmeter in the process of producing and supplying each grade of heat energy within a preset time period;
the predetermined time period is set according to the change rule of the local thermal load with time, and may be one day in specific implementation.
It can be understood that the flow meter is installed on the water return pipe, the hot water flows through the flow meter, and the flow meter can collect a plurality of parameters of the hot water. Exemplary are as follows: hot water flow, start time, end time, etc.
S2, acquiring unit heat basic heat price;
s3, calculating the heat charge of the heat energy supplied to the heat buying party by using a heat energy charging formula based on the water supply temperature, the water return temperature, the mass specific heat capacity, the starting time, the ending time, the comprehensive correction coefficient and the unit heat basic heat price;
s4, acquiring time correction coefficients and temperature correction coefficients for producing and supplying heat energy of each grade in different heat supply time periods within a preset time period;
wherein, the time correction coefficient is determined according to the heat load change rule of different time intervals, and the temperature correction coefficient is determined based on the investment cost of the thermal power plant and the heat buying party.
S5, correcting the heat rate using the temperature correction coefficient and the time correction coefficient to obtain a corrected heat rate;
it can be understood that the higher the high grade heat energy, the higher the supply water temperature, the higher the plant input cost. The lower the heat energy with low grade, the lower the water supply temperature, the lower the investment cost of the power plant. The lower the return water temperature is, the lower the steam condensate water temperature is, the higher the operation efficiency of the boiler is, and the higher the recovery utilization rate of the low-grade waste heat is. Therefore, the utilization efficiency and the cost investment of heat energy are comprehensively considered, and the water supply temperature of the water supply pipe and the water return temperature of the water return pipe are taken as factors influencing heat price. The lower the return water temperature is, for a heat buying party, on one hand, the more intense the heat exchange degree is, the higher the heat utilization efficiency is, the smaller the power consumption of the transmission is, and the higher the recovery utilization rate of the low-grade waste heat is; as the heat buying party needs to additionally input an energy station (a large temperature difference unit) to reduce the return water temperature, the cost of the heat buying party is high. Therefore, the return water temperature is only considered in the invention in consideration of the requirements of heat selling parties (power plants) and heat supply companies on the return water temperature and the encouragement of the power plants on the recycling of low-grade heat energy. Therefore, the heat price is corrected by introducing the temperature correction coefficient, so that the utilization efficiency of the heat energy of the thermal power plant can be improved, the input cost of the power plant can be reduced, and the correction of the heat price is also beneficial to reducing the heat purchasing cost of a heat purchasing party.
It can be understood that the heat power plant can realize heat supply while generating electricity through the cogeneration unit. Under the influence of electricity utilization habits of users, the load of a 24-hour power grid of a thermal power plant fluctuates at any time every day, and is required by power grid regulation, and when the electricity consumption of the users is reduced and the power grid is in low load, the low load is forced to participate in power grid peak regulation by a cogeneration unit for regulating the generated energy. Due to the mutual coupling relationship between the heat supply capacity and the power supply capacity of the cogeneration unit, the heat supply capacity of the cogeneration unit is obviously reduced when the power is low-load, so that the heat load can not meet the requirement, and the contradiction that the power supply is greater than the demand and the heating power supply is less than the demand appears. Therefore, the invention takes the heat load time tau as a factor influencing heat price, distinguishes the heat supply time periods, can effectively relieve the contradiction between heat and power supply and demand, effectively changes the heat utilization mode of the user side and achieves the effect of peak load shifting.
The corrected heat rate is as follows:
Figure BDA0002817395880000081
wherein, P represents the corrected heat fee settled by the thermal power plant and the heat buying party; p0Representing a unit heat base heat rate; f (t)g,th) The temperature correction coefficient of each grade of heat energy is represented; f (tau) represents time correction coefficients of different time periods in a preset time period; t is tgThe water supply temperature of the water supply pipe is expressed in units of; t is thThe unit of the return water temperature of a return water pipe of the power plant is; k represents a comprehensive correction coefficient of relative density and specific heat capacity; ρ represents the density of hot water flowing through the flowmeter in kg/m3(ii) a c represents the mass specific heat capacity of hot water, and c is 4178J/(kg. DEG C); q. q.svRepresents the volumetric flow rate of the hot water flowing through the flow meter in m3/s；τ1Representing the starting time of hot water flowing through the flow meter in seconds in divided time periods; tau is2Representing the end time of the hot water flowing through the flowmeter in seconds in the divided time period; τ denotes a time period.
The embodiment of the invention provides a multi-grade heat energy charging method based on return water temperature and time intervals. Therefore, the embodiment of the invention can change the heat charge metering scheme according to the heat demand, the actual heat consumption rule and the heat supply scheme of different regions, realize the accurate metering of heat charges of different grades and different time periods, simultaneously can mobilize the enthusiasm of a thermal power plant, a heat supply company and users, not only realizes energy conservation and consumption reduction, but also promotes the benign development of heat charge metering in the heat supply industry of China.
Example two
As an optional embodiment of the present invention, based on the water supply temperature, the water return temperature, the mass specific heat capacity, the start time, the end time, the comprehensive correction coefficient, and the unit heat basic heat price, a heat fee calculation formula is used to calculate the heat fee of the heat energy;
the heat fee calculation formula is as follows:
Figure BDA0002817395880000091
wherein, P represents a heat rate; p0Representing a unit heat base heat rate; t is tgIndicating the water supply temperature of the water supply pipe; t is thThe unit of the return water temperature of a return water pipe of the power plant is; k represents a comprehensive correction coefficient of relative density and specific heat capacity; ρ represents the density of hot water flowing through the flowmeter in kg/m3(ii) a c represents the mass specific heat capacity of hot water, and c is 4178J/(kg. DEG C); q. q.svRepresents the volumetric flow rate of the hot water flowing through the flow meter in m3/s，τ1Represents the initial time of hot water flowing through the heat meter, and has the unit of s, tau2Represents the end time of hot water flowing through the heat meter, and has the unit of s, and tau represents the heating time period.
EXAMPLE III
It can be understood that the higher the high grade heat energy, the higher the supply water temperature, the higher the plant input cost. The lower the heat energy with low grade, the lower the water supply temperature, the lower the investment cost of the power plant. The lower the return water temperature is, the lower the steam condensate water temperature is, the higher the operation efficiency of the boiler is, and the higher the recovery utilization rate of the low-grade waste heat is. Therefore, the utilization efficiency of heat energy and the cost input need to be comprehensively considered, and therefore the water supply temperature of the water supply pipe and the water return temperature of the water return pipe are factors influencing heat price. The lower the return water temperature is, for a heat buying party, on one hand, the more intense the heat exchange degree is, the higher the heat utilization efficiency is, the smaller the power consumption of the transmission is, and the higher the recovery utilization rate of the low-grade waste heat is; as the heat buying party needs to additionally input an energy station (a large temperature difference unit) to reduce the return water temperature, the cost of the heat buying party is high. Considering that both a heat selling party (a power plant) and a heat supply company have requirements on return water temperature and encouraging the power plant to recycle low-grade heat energy, the invention only considers the return water temperature. Therefore, the invention can improve the utilization efficiency of the heat energy of the thermal power plant by introducing the temperature correction coefficient to correct the heat fee, thereby reducing the input cost, and simultaneously, the correction of the heat fee is also beneficial to reducing the heat purchasing cost of a heat purchasing party.
As an optional embodiment of the invention, the heat cost after temperature correction can be calculated by obtaining the temperature correction coefficient of each grade of heat energy produced in a preset time period and through a temperature correction heat cost calculation formula;
the temperature correction heat cost calculation formula is as follows:
Figure BDA0002817395880000101
wherein, f (t)g,th) The temperature correction coefficient of each grade heat energy is shown, and P represents the heat rate after temperature correction.
The method comprises the following steps of obtaining temperature correction coefficients of different grades of heat energy produced in different heat supply time periods in a preset time period:
step a: determining the temperature gradient of the return water temperature according to the minimum value and the maximum value of the return water temperature of each grade heat energy;
step b: and determining the temperature correction coefficient of each grade of heat energy at each temperature step.
As an alternative embodiment of the present invention, the step of determining the temperature step of the return water temperature according to the minimum value and the maximum value of the return water temperature of each grade of heat energy includes:
step a: determining a backwater temperature interval based on the maximum value and the minimum value of the backwater temperatures of different grades of heat energy;
step b: when the return water temperature of the return water pipe is smaller than the minimum value in the return water temperature range, determining the temperature step of the return water temperature of the return water pipe as a first step;
step c: when the return water temperature of the return water pipe is within the return water temperature range, determining the temperature step of the return water temperature of the return water pipe as a second step;
step d: and when the return water temperature of the return water pipe is greater than the maximum value in the return water temperature range, determining the temperature step of the return water temperature of the return water pipe as a third step.
The backwater temperature interval is a temperature interval consisting of the minimum value and the maximum value of backwater temperatures of different grades of heat energy.
It can be understood that the invention relates the return water temperature t of the power planthThree different steps are divided, which are respectively:
a first step: when the temperature t of the return waterhMinimum value t of return water temperature smaller than different grade heat energyh,minI.e. th＜th,min；
A second step: when the temperature t of the return waterhThe minimum value t of the temperature of the return water is more than or equal to the minimum value t of the heat energy of different gradesh,minAnd is less than or equal to the maximum value t of the return water temperature of different grade heat energyh,maxI.e. th,min≤th≤th,max；
A third step: when the temperature t of the return waterhMaximum value t of return water temperature greater than different grade heat energyh,maxI.e. th＞th,max。
As an alternative embodiment of the present invention, determining the temperature correction factor for each grade of heat energy at each temperature step comprises:
determining a temperature correction coefficient of each grade of heat energy at each temperature step by using a calculation formula of a temperature correction system, wherein the calculation formula of the temperature correction coefficient is as follows:
Figure BDA0002817395880000111
Figure BDA0002817395880000112
wherein, f (t)h) The temperature correction coefficients of different grades of heat energy when the water supply temperature is constant are shown; piThe unit heat price of different grade heat energy calculated by a thermal power plant and a heat buying party is expressed as element/GJ; t is th,maxMaximum value of return water temperature, t, representing each grade of heat energyh,minRepresents the minimum value of the return water temperature of each grade heat energy.
The temperature correction coefficient f (t) of the heat energy of different step grades can be obtained by the calculation formula of the temperature correction coefficienth) Dependent on the temperature t of the return waterhLinearly changing, converting the calculation formula of the temperature correction coefficient to obtain the temperature correction coefficient f (t) of the heat energy of different grade gradesh) The calculation formula is as follows:
Figure BDA0002817395880000121
according to the above calculation formula, the temperature correction coefficient f (t) of the heat energy of different step grades can be determinedg,th)。
Example four
It can be understood that the heat power plant can realize heat supply while generating electricity through the cogeneration unit. Under the influence of electricity utilization habits of users, the load of a 24-hour power grid of a thermal power plant fluctuates at any time every day, and is required by power grid regulation, and when the electricity consumption of the users is reduced and the power grid is in low load, the low load is forced to participate in power grid peak regulation by a cogeneration unit for regulating the generated energy. Due to the mutual coupling relationship between the heat supply capacity and the power supply capacity of the cogeneration unit, the heat supply capacity of the cogeneration unit is obviously reduced when the power is low-load, so that the heat load can not meet the requirement, and the contradiction that the power supply is greater than the demand and the heating power supply is less than the demand appears. Therefore, according to the law of the change of the thermal load of the city in winter along with time, the time tau is taken as a factor influencing the heat price, the heat supply time periods are distinguished, the contradiction between heat and electricity supply and demand can be effectively relieved, the heat utilization mode of a user side is effectively changed, and the effect of shifting peaks and filling valleys is achieved.
As an optional embodiment of the present invention, the heat cost after time correction can be calculated by obtaining the time correction coefficients for producing and supplying heat energy of each grade in different heat supply time periods within a predetermined time period and using a time correction heat cost calculation formula;
the time correction heat rate calculation formula is as follows:
Figure BDA0002817395880000131
where f (τ) represents a time correction coefficient, and P represents a heat rate after time correction.
As an alternative embodiment of the present invention, the step of obtaining the time correction coefficients for producing and supplying heat energy of each grade in different heat supply time periods within a predetermined time period includes:
step a: dividing a heat supply time period into a peak value time period, a valley value time period and an average value time period based on the change of the heat load;
step b: time correction coefficients for the respective time segments are determined.
The invention proposes to divide the heating time period tau into three different periods according to the thermal load: and respectively charging different time periods in the peak time period, the valley time period and the average time period.
Peak time period τh: when the heat time τ is within the peak period of the thermal load of the plant, i.e., τh1≤τ≤τh2；
Valley period τl: when heat is used for a time period of tauDuring the thermal load valley period of the plant, i.e. taul1≤τ≤τl2；
Mean time period τa: when the heat-using time τ is within the heat load leveling period of the plant, i.e., τa1≤τ≤τa2；
As an alternative embodiment of the present invention, the determining the time correction factor of each time segment includes:
determining the time correction coefficient of each time segment by using a calculation formula of the time correction coefficient, wherein the calculation formula of the time correction coefficient is as follows:
Figure BDA0002817395880000141
Figure BDA0002817395880000142
Figure BDA0002817395880000143
wherein the content of the first and second substances,
Figure BDA0002817395880000144
is divided into
Figure BDA0002817395880000145
And
Figure BDA0002817395880000146
τ is τa、τhAnd τl，
Figure BDA0002817395880000147
The average heat load in unit time in the heat load leveling time period is represented, and the unit is GJ/h;
Figure BDA0002817395880000148
represents the average heat load per unit time in the peak time period of the heat loadThe bit is GJ/h;
Figure BDA0002817395880000149
the average heat load in unit time in the heat load valley time period is represented, and the unit is GJ/h;
Figure BDA00028173958800001410
representing a flat time period τaThe cumulative thermal load in GJ;
Figure BDA00028173958800001411
representing the peak time period tauhThe cumulative thermal load in GJ;
Figure BDA00028173958800001412
representing a valley period τlThe cumulative thermal load within; the unit is GJ; delta tau is divided into taua1-τa2，τh1-τh2And τl1-τl2。
Converting the calculation formula of the time correction coefficient, wherein the calculation formula of the time correction coefficient is as follows:
Figure BDA00028173958800001413
the following describes a multi-grade heat energy charging method based on return water temperature and time intervals according to an embodiment of the present invention in an example manner of an actual situation.
Example 1
The local heating season of a certain city is 11 months and 15 days to 3 months and 15 days, the heat buying party is a heating power company, the basic heat value is 37.5 yuan/GJ, and the return water temperature thWhen the temperature is higher than 40 ℃, the heat value is the original basic heat value P of the power plant0. When the temperature t of the return waterhAt a temperature lower than 40 ℃, i.e. the return water temperature thWhen the temperature is low, a heat supply company invests a large-temperature-difference heat exchange unit to ensure that the return water temperature t is thThe temperature correction coefficient f (t) is reduced because the heat power company should pay less feeg,th) And is reduced accordingly. The power plant and the heating power company agreementConvention, when the return water temperature thWhen the temperature is lower than 10 ℃, in order to make up for the investment cost of a large-temperature-difference heat exchange unit of a heating power company, the temperature correction coefficient f (t) at the momentg,th) The heat company does not pay the heat fee, which is 0.
Therefore, the temperature correction coefficient f (t) of the present inventiong,th) The specific values of (A) are shown as follows:
Figure BDA0002817395880000151
according to the multi-grade heat energy charging method based on the return water temperature and the time intervals, the return water temperature t of the thermal power plant is measuredhThree different steps are divided, which are respectively:
a first step: t is th＜40；
A second step: t is not less than 10h≤40；
A third step: t is th＞40。
A first step: when the temperature t of the return waterhThe temperature is less than the minimum value of return water temperature of different grade heat energy agreed by power plants and heat supply companies by 10 ℃, namely th＜10℃；
A second step: when the temperature t of the return waterhThe minimum value of the return water temperature of different grade heat energy agreed by the power plant and the heat supply company is more than or equal to 10 ℃, and the maximum value of the return water temperature of different grade heat energy agreed by the power plant and the heat supply company is less than or equal to 40 ℃, namely t is more than or equal to 10 ≤ th≤40；
A third step: when the temperature t of the return waterhThe maximum value of the return water temperature of different grade heat energy agreed by power plants and heat supply companies is 40 ℃, namely th＞40。
The cost and the return water temperature t of different step grade heat energy produced by the thermal power planthTemperature correction coefficient f (t) of thermovalence with linear changeg,th) Dependent on the temperature t of the return waterhThe unit heat cost of the heat energy with different grades is calculated as follows:
Figure BDA0002817395880000161
by the formula, the temperature correction coefficients f (t) of the heat energy of different step grades can be obtainedg,th) The calculation formula (c) is as follows:
Figure BDA0002817395880000162
the temperature correction coefficient f (t) for determining different step gradesg,th) The method can obtain the unit heat cost and the return water temperature t of the heat energy with different step grades in the inventionhTemperature correction coefficient f (t) in linear variationg,th) As shown in table 1 below.
TABLE 1
Figure BDA0002817395880000163
The change rule of 24h heat load per day along with time in a heating season of a certain city is counted, and the heating time period tau of the city can be divided into three different time periods, as shown in table 2:
TABLE 2
Figure BDA0002817395880000164
Figure BDA0002817395880000171
According to a calculation formula of the time correction coefficient f (tau) in different time periods tau, the average heat load per unit time in different time periods can be calculated:
Figure BDA0002817395880000172
therefore, the calculation formula of the time correction coefficient f (τ) in different time periods τ is as follows:
Figure BDA0002817395880000173
therefore, the heat rate of the heat energy supplied to the heat buying party can be calculated by the heat rate calculation formula of the heat energy supplied to the heat buying party under the condition that the parameters are determined.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (6)

1. A multi-grade heat energy charging method based on return water temperature and time-sharing is characterized by comprising the following steps:
acquiring the water supply temperature of a water supply pipe, the return water temperature of a return water pipe, the specific heat capacity of the mass of hot water flowing through a flowmeter, the starting time of the hot water flowing through the flowmeter, the ending time of the hot water flowing through the flowmeter and the comprehensive correction coefficient of the relative density and the specific heat capacity of the hot water flowing through the flowmeter in the process of producing and supplying each grade of heat energy within a preset time period;
acquiring a unit heat basic heat price;
calculating the heat fee of the heat energy supplied to the heat buying party based on the water supply temperature, the water return temperature, the mass specific heat capacity, the starting time, the ending time, the comprehensive correction coefficient and the unit heat basic heat price;
acquiring temperature correction coefficients and time correction coefficients of production and supply of heat energy of each grade in different time periods within a preset time period;
correcting the heat rate by using the temperature correction coefficient and the time correction coefficient to obtain a corrected heat rate;
the corrected heat rate is as follows:
Figure FDA0003311218720000011
wherein, P represents the corrected heat charge, and the unit is element; p0The unit heat basic heat price is expressed, and the unit is Yuan/GJ; f (t)g,th) Temperature correction coefficients representing different grades of heat energy; f (tau) represents time correction coefficients of different time periods in a preset time period; t is tgThe water supply temperature of the water supply pipe is expressed in units of; t is thThe unit of the return water temperature of a return water pipe of the power plant is; k represents a comprehensive correction coefficient of relative density and specific heat capacity; p represents heat flowing through the flow meterWater density in kg/m3(ii) a c represents the mass specific heat capacity of hot water, and c is 4178J/(kg. DEG C); q. q.svRepresents the volumetric flow rate of the hot water flowing through the flow meter in m3/s；τ1Representing the starting time of hot water flowing through the flow meter in seconds in divided time periods; tau is2Representing the end time of the hot water flowing through the flowmeter in seconds in the divided time period; τ denotes a time period.
2. The multi-grade heat energy charging method based on return water temperature and time intervals as claimed in claim 1, wherein the obtaining of the temperature correction coefficient for producing each grade of heat energy in different time intervals within a predetermined time interval comprises:
determining the minimum value and the maximum value of the return water temperature according to different grades of heat energy, thereby determining the temperature gradient of the return water temperature;
and determining the temperature correction coefficient of each grade of heat energy at each temperature step.
3. The multi-grade heat energy billing method based on return water temperature and time-sharing according to claim 2, wherein the step of determining the temperature step of the return water temperature according to the minimum value and the maximum value of the return water temperature of different grade heat energy comprises:
determining a backwater temperature interval based on the maximum value and the minimum value of the backwater temperatures of different grades of heat energy;
when the return water temperature of the return water pipe is smaller than the minimum value in the return water temperature range, determining the temperature step of the return water temperature of the return water pipe as a first step;
when the return water temperature of the return water pipe is within the return water temperature range, determining the temperature step of the return water temperature of the return water pipe as a second step;
and when the return water temperature of the return water pipe is greater than the maximum value in the return water temperature range, determining the temperature step of the return water temperature of the return water pipe as a third step.
4. The method according to claim 2, wherein the determining the temperature correction coefficient of each grade heat energy at each temperature step comprises:
determining a temperature correction coefficient of each grade of heat energy at each temperature step by using a calculation formula of a temperature correction system, wherein the calculation formula of the temperature correction coefficient is as follows:
Figure FDA0003311218720000031
Figure FDA0003311218720000032
wherein, f (t)h) The temperature correction coefficients of different grades of heat energy when the water supply temperature is constant are shown; piThe unit heat price of different grade heat energy calculated by a thermal power plant and a heat buying party is expressed as element/GJ; t is th,maxMaximum value of return water temperature, t, representing each grade of heat energyh,minRepresents the minimum value of the return water temperature of each grade heat energy.
5. The multi-grade heat energy charging method based on the return water temperature and the time intervals as claimed in claim 1, wherein the obtaining of the time correction coefficient for supplying each grade heat energy in different time intervals within a predetermined time interval comprises:
dividing the time period into a peak time period, a valley time period, and an average time period based on a change in the thermal load;
time correction coefficients for the respective time segments are determined.
6. The method according to claim 4, wherein the determining the time correction factor for each time segment comprises:
determining the time correction coefficient of each time segment by using a calculation formula of the time correction coefficient, wherein the calculation formula of the time correction coefficient is as follows:
Figure FDA0003311218720000033
Figure FDA0003311218720000034
Figure FDA0003311218720000041
wherein the content of the first and second substances,
Figure FDA0003311218720000042
is divided into
Figure FDA0003311218720000043
And
Figure FDA0003311218720000044
τ is τa、τhAnd τl，
Figure FDA0003311218720000045
The average heat load in unit time in the heat load leveling time period is represented, and the unit is GJ/h;
Figure FDA0003311218720000046
the average heat load in unit time in the heat load peak time period is shown, and the unit is GJ/h;
Figure FDA0003311218720000047
the average heat load in unit time in the heat load valley time period is represented, and the unit is GJ/h;
Figure FDA0003311218720000048
representing a flat time period τaThe cumulative thermal load in GJ;
Figure FDA0003311218720000049
representing the peak time period tauhThe cumulative thermal load in GJ;
Figure FDA00033112187200000410
representing a valley period τlThe cumulative thermal load in GJ; delta tau is divided into taua2-τa1，τh2-τh1And τl2-τl1。
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