CN112594774A - Heat charge metering method and device for multi-grade heat energy based on return water temperature - Google Patents
Heat charge metering method and device for multi-grade heat energy based on return water temperature Download PDFInfo
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Abstract
The invention provides a heat fee metering method and a device of multi-grade heat energy based on return water temperature, which are characterized in that in the process of supplying heat to users by adopting different grade heat energy in a preset time period, the water supply temperature of a water supply pipe, the return water temperature of a return water pipe, the mass specific heat capacity of hot water, the starting time of hot water flowing through a flowmeter, the ending time of hot water flowing through the flowmeter, the comprehensive correction coefficient of the relative density and the specific heat capacity of hot water flowing through the flowmeter, and the unit heat basic heat price are obtained, then the heat fee settled by a thermal power plant and a heat buyer is calculated, and then the heat fee is corrected by introducing a temperature correction coefficient which influences the heat buyer and the determination of the input cost of the thermal. Therefore, the invention can realize the accurate measurement of the heat cost according to the return water temperature of different grade heat energy, can change the heat cost measurement scheme according to the heat supply requirements and heat supply schemes of different regions, simultaneously mobilize the enthusiasm of the thermal power plant and the heat buying party, save energy and reduce consumption, and simultaneously promote the benign development of the heat cost measurement of the heat supply industry in China.
Description
Technical Field
The invention belongs to the field of heat supply metering, and particularly relates to a multi-grade heat energy heat charge metering method and device based on return water temperature.
Background
Heat energy is an essential energy for people's modern life. The thermal power plant produces electric energy directly utilized by people and heat energy required for life heating of people through the production mode of cogeneration, and the heat mainly comprises: the steam heat generated by the boiler belongs to high-temperature high-grade heat; the heat dissipated to the atmosphere by the water cooling tower or the air cooling island belongs to low-temperature and low-grade heat. Before the thermal power plant is transformed, a heat supply system only utilizes high-grade heat at high temperature, low-grade heat at low temperature belongs to waste heat, and the low-grade heat is discharged into the atmosphere through an air cooling tower, so that heat waste is caused. At present, in order to save energy, reduce consumption and reduce operation cost, the state encourages a heating system to adopt various waste heat recovery technical means (including flue gas waste heat recovery, exhaust steam waste heat recovery and the like) when a part of high-grade heat is utilized, so that low-grade waste heat of a thermal power plant is fully utilized, and the heat utilization efficiency is improved.
In view of the different quality of the thermal energy and the different production cost, the different quality of the thermal energy, the different heating cost, and the different heat selling price should be. However, at present, China realizes unified basic heat price for different grades of heat energy, and the charge cost is not changed along with different costs. For the heat buyer, the heat buyer can only determine the total heat bought by himself through the heat meter and pay according to the total heat or the total area, and the quality of the heat energy used by himself is not required too much.
In order to realize accurate calculation of heat cost of heat energy with different qualities, the most effective method is to set a simple and efficient heat cost metering scheme for heat energy with different grades from a heat supply metering design method. However, the existing heat rate metering method does not consider the difference of heat energy with different qualities, can not realize the heat rate metering of the heat energy with different grades, can not promote the recycling of low-grade heat energy of a thermal power plant, and violates the current big trend of energy conservation and emission reduction in the society, so that the heat supply demand of users and the benefit of the users cannot be guaranteed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a heat charge metering method and a heat charge metering device for multi-grade heat energy based on return water temperature. The technical problem to be solved by the invention is realized by the following technical scheme:
in a first aspect, the invention provides a heat rate metering method of multi-grade heat energy based on return water temperature, 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 mass specific heat capacity of hot water, the starting time of the hot water flowing through a 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 heating by adopting different grades 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 for producing different grades of heat energy in a preset time period;
correcting the heat charge by using the temperature correction coefficient to obtain the heat charge after temperature correction;
the heat rate after the temperature correction is as follows:
wherein, P represents the corrected heat charge, and the unit is element; p0Expressing basis of unit heatHeat value, unit is yuan/GJ; f (t)g,th) Temperature correction coefficients representing different grades of heat energy; t is tgThe water supply temperature of the water supply pipe is expressed in units of; t is thThe return water temperature of a return water pipe of the thermal power plant is represented, and the unit 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 starting time of hot water flowing through the heat meter, and the unit is s; tau is2Represents the end time of hot water flowing through the heat meter, and the unit is s; τ represents time.
Optionally, in the process of supplying heat to the heat buying party by using different-grade heat energy within the predetermined time period, the temperature correction coefficients of the different-grade heat energy include:
determining the temperature gradient of the return water temperature according to the minimum value and the maximum value of the return water temperature of different grades of heat energy;
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 return water temperature interval based on the maximum value and the minimum value of the return water temperature;
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 heat energy at each temperature step by using a calculation formula of the temperature correction coefficient, wherein the calculation formula of the temperature correction coefficient is as follows:
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 basic heat price of different grade heat energy calculated by a thermal power plant and a heat buying party is represented by unit/GJ; t is th,maxThe maximum value of the return water temperature of different grades of heat energy is expressed in unit; t is th,minRepresents the minimum value of the temperature of the return water of different grades of heat energy.
In a second aspect, the invention provides a heat rate metering device of multi-grade heat energy based on return water temperature, comprising: the multi-gradient integral integrating instrument comprises a multi-gradient integral integrating instrument, a first temperature sensor, a second temperature sensor and a flowmeter, wherein the first temperature sensor is arranged on a water supply pipe of the thermal power plant, the second temperature sensor and the flowmeter are arranged on a water return pipe of the thermal power plant, and the multi-gradient integral integrating instrument is respectively connected with the first temperature sensor, the second temperature sensor and the flowmeter;
the first temperature sensor is used for collecting the water supply temperature of a water supply pipe in the process of heating by adopting different grades of heat energy within a preset time period and transmitting the water supply temperature to the multi-gradient integral integrator;
the second temperature sensor is used for collecting the return water temperature of the thermal power plant and the return water pipe in the process of adopting different grades of heat energy to supply heat in a preset time period, and transmitting the return water temperature to the multi-gradient integral integrating and integrating instrument;
the flowmeter is used for acquiring the volume flow, the starting time and the ending time of the thermal power plant which adopts different-grade heat energy to supply heat in a preset time period and flows through the flowmeter;
the multi-gradient integral integrating and integrating instrument is used for calculating the heat charge 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 of different grades of heat energy in the process of heating by adopting different grades of heat energy within a preset time period;
correcting the heat rate by using the temperature correction coefficient to obtain the corrected heat rate;
the corrected heat rate is as follows:
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) The temperature correction coefficient of each grade heat source is represented; t is tgThe water supply temperature of the water supply pipe is expressed in units of; t is thThe return water temperature of a return water pipe of the thermal power plant is represented, and the unit 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 starting time of hot water flowing through the heat meter, and the unit is s; tau is2Represents the end time of hot water flowing through the heat meter, and the unit is s; τ denotes a heating period.
Optionally, the heat rate metering device for multi-grade heat energy based on return water temperature further includes: an acquisition processing unit connected with the multi-gradient integral integrating instrument,
the obtaining and processing unit is used for obtaining temperature correction coefficients of different grades of heat energy in the process of heating by adopting different grades of heat energy within a preset time period, and comprises the following steps:
determining the temperature gradient of the return water temperature according to the minimum value and the maximum value of the return water temperature of different grades of heat energy;
and determining the temperature correction coefficient of each grade of heat energy at each temperature step.
Optionally, the obtaining and processing unit is configured to determine a return water temperature interval based on a maximum value and a minimum value of the return water temperature;
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 obtaining and processing unit is configured to determine a temperature correction coefficient of each grade of heat energy at each temperature step by using a calculation formula of a temperature correction system, where the calculation formula of the temperature correction coefficient is:
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 basic heat price of different grade heat energy calculated by a thermal power plant and a heat buying party is represented by unit/GJ; t is th,maxMaximum value of return water temperature, t, representing different grade heat energyh,minRepresents the minimum value of the temperature of the return water of different grades of heat energy.
According to the heat fee metering method and device based on the return water temperature and the multi-grade heat energy, the water supply temperature of a water supply pipe, the return water temperature of a return water pipe, the mass specific heat capacity of hot water, the starting time of the hot water flowing through a flowmeter, the ending time of the hot water flowing through the flowmeter, the comprehensive correction coefficient of the relative density and the specific heat capacity of the hot water flowing through the flowmeter and the unit heat basic heat price are obtained in the process of producing different grade heat energy within a preset time period, then the heat fee settled by a thermal power plant and a heat buyer is calculated, and then the heat fee is corrected by introducing the temperature correction coefficient which influences the heat buyer and the determination of the input cost of the thermal power plant. Therefore, the embodiment of the invention accurately and effectively measures the heat charge of the heat energy with different grades according to the return water temperature of the heat energy with different grades, changes the heat charge measuring scheme according to the heat supply requirements of users in different regions and the heat supply scheme, and promotes the benign development of heat charge measurement in the heat supply industry of China while mobilizing the enthusiasm in all aspects.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a flow chart of a heat rate metering method of multi-grade heat energy based on return water temperature according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a heat rate metering device for multi-grade heat energy based on return water temperature 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 heat rate metering method for multi-grade heat energy based on return water temperature according to an embodiment of the present invention includes:
s1, acquiring the water supply temperature of a water supply pipe, the return water temperature of a return water pipe, the mass specific heat capacity of hot water, the starting time of the hot water flowing through a 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 heating by adopting different grade heat energy within a preset time period;
the preset time is set according to the actual situation, and the actual heat supply time period corresponding to each grade of heat energy is used as the standard 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 through the flow meter, 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 multi-grade heat energy charging formula based on the water supply temperature, the return water 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 temperature correction coefficients of different grades of heat energy in a preset time period;
the temperature correction coefficient is determined according to the input cost of the thermal power plant and the heat buying party to different grade heat energy, and the different grade heat energy is distinguished according to the return water temperature flowing back to the thermal power plant.
S5, correcting the heat rate by using the temperature correction coefficient to obtain the heat rate after temperature correction;
it can be understood that the higher the high grade heat energy, the higher the supply water temperature, the higher the thermal power plant input cost. The lower the heat energy with low grade, the lower the water supply temperature, the lower the investment cost of the thermal 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 buying a heat 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 also becomes high. The method only considers the return water temperature when the heat selling party (thermal power plant) and the heat buying party (heating company) have requirements on the return water temperature and encourages the thermal power plant to recycle the low-grade heat energy. Therefore, the heat cost correction of different grade heat energy is carried out by introducing the temperature correction coefficient, the investment cost of the thermal power plant is reduced on the basis of improving the heat energy utilization efficiency of the thermal power plant, and meanwhile, the heat cost correction is also beneficial to reducing the heat purchasing cost of a heat purchasing party.
The heat rate after temperature correction is:
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) The temperature correction coefficient of each grade heat source is represented; t is tgThe water supply temperature of the water supply pipe is expressed in units of; t is thThe return water temperature of a return water pipe of the thermal power plant is represented, and the unit 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 starting time of hot water flowing through the heat meter, and the unit is s; tau is2Represents the end time of hot water flowing through the heat meter, and the unit is s; τ denotes a heating period.
According to the heat fee metering method of the multi-grade heat energy based on the return water temperature, the water supply temperature of a water supply pipe, the return water temperature of a return water pipe, the mass specific heat capacity of hot water, the starting time of the hot water flowing through a flowmeter, the ending time of the hot water flowing through the flowmeter, the comprehensive correction coefficient of the relative density and the specific heat capacity of the hot water flowing through the flowmeter and the unit heat basic heat price are obtained in the process of producing different grade heat energy within a preset time period, then the heat fee settled by a thermal power plant and a heat buyer is calculated, and then the heat fee is corrected by using the temperature correction coefficient which can influence the heat buyer and the determination of the input cost of the thermal power plant. Therefore, the embodiment of the invention accurately and effectively measures the heat cost of the heat energy with different grades according to the return water temperature of the heat energy with different grades, changes the heat cost measuring scheme according to the user heat supply requirements and the heat supply scheme of different regions, and promotes the benign development of the heat cost measurement in the heat supply industry of China while mobilizing the enthusiasm in all aspects.
Example two
As an alternative embodiment of the present invention, the obtaining of the temperature correction coefficient for producing different grades of heat energy in a predetermined time period comprises the following steps:
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 different grades of 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 different grades of heat energy comprises:
step a: determining a return water temperature interval based on the maximum value and the minimum value of the return water temperature;
step b: when the return water temperature of the return water pipe is smaller than the minimum value in the return water temperature range, the temperature gradient of the return water temperature of the return water pipe is a first gradient;
step c: when the return water temperature of the return water pipe is within the return water temperature range, the temperature gradient of the return water temperature of the return water pipe is a second gradient;
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, the temperature gradient of the return water temperature of the return water pipe is a third gradient.
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 thermal 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 coefficient of each grade heat energy at different temperature steps comprises:
determining temperature correction coefficients of the heat energy of each grade under different temperature steps by using a calculation formula of a temperature correction system, wherein the calculation formula of the temperature correction coefficients is as follows:
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,maxThe maximum value of the return water temperature of each grade heat energy is expressed in units of ℃; t is th,minThe minimum value of the temperature of the return water of each grade heat energy is shown in the unit of ℃.
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:
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 III
As an alternative embodiment of the present invention, the heat rate of the supplied heat energy is calculated using a heat rate calculation formula based on the supply water temperature, the return water temperature, the mass specific heat capacity, the start time, the end time, the comprehensive correction coefficient, and the unit heat basic heat rate.
The heat rate calculation formula is as follows:
wherein, P represents the heat charge, and the unit is element; p0The unit heat basic heat price is expressed, and the unit is Yuan/GJ; t is tgThe water supply temperature of the water supply pipe is expressed in units of; t is thThe return water temperature of a return water pipe of the thermal power plant is represented, and the unit 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 starting time of hot water flowing through the heat meter, and the unit is s; tau is2Represents the end time of hot water flowing through the heat meter, and the unit is s; τ represents time.
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, the heat supply time periods are distinguished according to the heat load time tau serving as a factor influencing heat price, so that 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 peak load shifting is achieved.
As an optional embodiment of the present invention, the heat cost after time correction can be calculated by obtaining the time correction coefficient for producing each grade heat energy in each heat supply time period in the predetermined time period and using the time correction total calculation formula;
the time correction total price calculation formula is as follows:
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 coefficient for producing each grade of heat energy in each heat supply time period in the 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-using time tau is within the peak time of the thermal load of the thermal power plant, i.e. tauh1≤τ≤τh2；
Valley period τl: when the heat consumption time tau is in the thermal load valley period of the thermal power plant, i.e. taul1≤τ≤τl2；
Mean time period τa: when the heat-using time tau is within the heat-load leveling period of the thermal power plant, i.e. taua1≤τ≤τa2；
As an alternative embodiment of the present invention, determining the time correction factor for 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:
wherein the content of the first and second substances,
is divided into
And
τ is τa、τhAnd τl，
The average heat load in unit time in the heat load leveling time period is represented, and the unit is GJ/h;
the average heat load in unit time in the heat load peak time period is shown, and the unit is GJ/h;
the average heat load in unit time in the heat load valley time period is represented, and the unit is GJ/h;
representing a flat time period τaThe cumulative thermal load in GJ;
representing the peak time period tauhThe cumulative thermal load in GJ;
representing a valley period τlThe cumulative thermal load within; the unit is GJ; delta tau is divided into taua2-τa1，τh2-τh1And τl2-τl1。
Converting the calculation formula of the time correction coefficient, wherein the calculation formula of the time correction coefficient is as follows:
EXAMPLE five
In order to improve the accuracy of the heat rate measurement, the time correction and the temperature correction may be performed simultaneously for the heat rate.
As an alternative embodiment of the present invention, the corrected heat rate may be calculated using a total correction calculation formula based on the time correction coefficient and the temperature correction coefficient;
the total correction calculation formula is calculated as:
as shown in fig. 2, an embodiment of the present invention provides a heat rate calculation apparatus for multi-grade heat energy based on return water temperature, including: a multi-gradient integral integrating instrument 1, a first temperature sensor 2, a second temperature sensor 3 and a flowmeter 4, wherein the first temperature sensor is arranged on a water supply pipe of the thermal power plant, the second temperature sensor and the flowmeter are arranged on a water return pipe of the thermal power plant, the multi-gradient integral integrating instrument is respectively connected with the first temperature sensor, the second temperature sensor and the flowmeter,
the first temperature sensor is used for collecting the water supply temperature of the water supply pipe in the process of producing each grade heat energy in a preset time period and transmitting the water supply temperature to the multi-gradient integral integrator;
the second temperature sensor is used for collecting the return water temperature of the return water pipe in the process of producing each grade of heat energy in a preset time period of the thermal power plant and transmitting the supply water temperature to the multi-gradient integral integrating and integrating instrument;
the flowmeter is used for acquiring the flow rate, the volume flow rate, the starting time and the ending time of hot water flowing through the flowmeter in the process of producing each grade heat energy in a preset period of time;
the multi-gradient integral integrator is used for acquiring the water supply temperature of a water supply pipe, the return water temperature of a return water pipe, the mass specific heat capacity of hot water, 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 each grade heat energy within a preset time period;
acquiring a unit heat basic heat price;
calculating the heat charge of the heat energy supplied to the heat buying party based on the water supply temperature, the return water 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 of different grades of heat energy produced in different heat supply time periods within a preset time period;
correcting the heat rate by using the temperature correction coefficient to obtain the corrected heat rate;
the corrected heat rate is:
wherein P represents the corrected heat rate, P0Denotes the base heat rate per unit of heat, f (t)g,th) Temperature correction coefficient, t, representing each grade heat sourcegIndicating the temperature of water supplied, t, from the water supply pipehThe return water temperature of a return water pipe of the thermal power plant is represented, and the unit 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 in seconds, tau2Represents the end time of hot water flowing through the heat meter in seconds, and tau represents the heating time period.
Optionally, the correction device provided in the embodiment of the present invention further includes: an acquisition processing unit connected with the multi-gradient integral integrating instrument,
the obtaining and processing unit is used for obtaining temperature correction coefficients of different heat supply time periods in a preset time period to produce heat energy of each grade, and comprises the following steps:
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;
and determining the temperature correction coefficient of each grade of heat energy at each temperature step.
Optionally, the obtaining and processing unit is configured to determine a return water temperature interval based on a maximum value and a minimum value of the return water temperature;
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 gradient of the return water temperature of the return water pipe as a first gradient;
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 obtaining and processing unit is configured to determine a temperature correction coefficient of each grade of heat energy at each temperature step by using a calculation formula of a temperature correction system, where the calculation formula of the temperature correction coefficient is:
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 following describes a heat rate calculation method of multi-grade heat energy based on return water temperature according to an embodiment of the present invention in an example manner of a practical 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 thermal 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 agreement between the thermal power plant and the heating power company is agreed 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) Tool (A)The value of the body is shown as the following formula:
according to the heat fee calculation method of the multi-grade heat energy based on the return water temperature, which is provided by the embodiment of the invention, the return water temperature t of the thermal power plant is calculatedhThree 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 waterhLess than 10 ℃ of the minimum value of the return water temperature of different grades of heat energy agreed by thermal power plants and heat supply companies, 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 thermal 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 thermal 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 thermal power plants and heat supply companies is higher than 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:
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:
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
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
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:
therefore, the calculation formula of the time correction coefficient f (τ) in different time periods τ is as follows:
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 (8)
1. A heat charge metering method of multi-grade heat energy based on return water temperature 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 mass specific heat capacity of hot water, the starting time of the hot water flowing through a 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 heating by adopting different grades 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 for producing different grades of heat energy in a preset time period;
correcting the heat charge by using the temperature correction coefficient to obtain the heat charge after temperature correction;
the heat rate after the temperature correction is as follows:
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; t is tgThe water supply temperature of the water supply pipe is expressed in units of; t is thThe return water temperature of a return water pipe of the thermal power plant is represented, and the unit 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 starting time of hot water flowing through the heat meter, and the unit is s; tau is2Represents the end time of hot water flowing through the heat meter, and the unit is s; τ represents time.
2. The correction method according to claim 1, wherein in the process of supplying heat to the heat buying party by using different-grade heat energy in the predetermined time period, the temperature correction coefficients of the different-grade heat energy comprise:
determining the temperature gradient of the return water temperature according to the minimum value and the maximum value of the return water temperature of different grades of heat energy;
and determining the temperature correction coefficient of each grade of heat energy at each temperature step.
3. The correction method according to claim 2, wherein the step of determining the temperature step of the returned water temperature according to the minimum value and the maximum value of the returned water temperature of different grade heat energy comprises:
determining a return water temperature interval based on the maximum value and the minimum value of the return water temperature;
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 of modifying of claim 2, wherein said determining a temperature modification factor for each grade of heat energy at each temperature step comprises:
determining a temperature correction coefficient of each grade heat energy at each temperature step by using a calculation formula of the temperature correction coefficient, wherein the calculation formula of the temperature correction coefficient is as follows:
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 basic heat price of different grade heat energy calculated by a thermal power plant and a heat buying party is represented by unit/GJ; t is th,maxThe maximum value of the return water temperature of different grades of heat energy is expressed in unit; t is th,minRepresents the minimum value of the temperature of the return water of different grades of heat energy.
5. The utility model provides a heat rate metering device of grade heat energy of many grades based on return water temperature which characterized in that includes: the multi-gradient integral integrating instrument comprises a multi-gradient integral integrating instrument, a first temperature sensor, a second temperature sensor and a flowmeter, wherein the first temperature sensor is arranged on a water supply pipe of the thermal power plant, the second temperature sensor and the flowmeter are arranged on a water return pipe of the thermal power plant, and the multi-gradient integral integrating instrument is respectively connected with the first temperature sensor, the second temperature sensor and the flowmeter;
the first temperature sensor is used for collecting the water supply temperature of a water supply pipe in the process of heating by adopting different grades of heat energy within a preset time period and transmitting the water supply temperature to the multi-gradient integral integrator;
the second temperature sensor is used for collecting the return water temperature of the thermal power plant and the return water pipe in the process of adopting different grades of heat energy to supply heat in a preset time period, and transmitting the return water temperature to the multi-gradient integral integrating and integrating instrument;
the flowmeter is used for acquiring the volume flow, the starting time and the ending time of the thermal power plant which adopts different-grade heat energy to supply heat in a preset time period and flows through the flowmeter;
the multi-gradient integral integrating and integrating instrument is used for calculating the heat charge 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 of different grades of heat energy in the process of heating by adopting different grades of heat energy within a preset time period;
correcting the heat rate by using the temperature correction coefficient to obtain the corrected heat rate;
the corrected heat rate is as follows:
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) The temperature correction coefficient of each grade heat source is represented; t is tgThe water supply temperature of the water supply pipe is expressed in units of; t is thThe return water temperature of a return water pipe of the thermal power plant is represented, and the unit 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 starting time of hot water flowing through the heat meter, and the unit is s; tau is2Represents the end time of hot water flowing through the heat meter, and the unit is s; τ denotes a heating period.
6. The correction device according to claim 5, characterized in that the device further comprises: an acquisition processing unit connected with the multi-gradient integral integrating instrument,
the obtaining and processing unit is used for obtaining temperature correction coefficients of different grades of heat energy in the process of heating by adopting different grades of heat energy within a preset time period, and comprises the following steps:
determining the temperature gradient of the return water temperature according to the minimum value and the maximum value of the return water temperature of different grades of heat energy;
and determining the temperature correction coefficient of each grade of heat energy at each temperature step.
7. The correction device according to claim 6, wherein the acquisition processing unit is configured to determine a return water temperature interval based on a maximum value and a minimum value of the return water temperature;
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.
8. The correction device according to claim 6, wherein the acquisition processing unit is configured to determine the temperature correction coefficient of each grade heat energy at each temperature step using a calculation formula of a temperature correction system, the calculation formula of the temperature correction coefficient being:
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 basic heat price of different grade heat energy calculated by a thermal power plant and a heat buying party is represented by unit/GJ; t is th,maxMaximum value of return water temperature, t, representing different grade heat energyh,minRepresents the minimum value of the temperature of the return water of different grades of heat energy.
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