阅读说明：本技术 一种基于回水温度及分时段的多梯级品位热能计费方法 (Multi-grade heat energy charging method based on return water temperature and time-interval ) 是由 黄维 马亮 来婷 黄涛 王晓 于 2020-12-04 设计创作，主要内容包括：本发明提供的一种基于回水温度及分时段的多梯级品位热能计费方法,通过获取在预定时段内生产、供给各个品位热能过程中,供水管的供水温度、回水管的回水温度、流经流量计的热水质量比热容、热水流经流量计的起始时间、结束时间、流经流量计的热水的相对密度与比热容的综合修正系数、单位热量基础热价,然后计算热电厂与买热方结算的热费,之后引入影响买热方以及热电厂投入成本的温度修正系数以及影响不同供热时间段热负荷的时间修正系数对热费进行修正。因此本发明可以根据不同地域的供热需求、用户实际用热规律、供热方案相应地改变热能计费方案,同时调动热电厂、热力公司、用户的积极性,实现不同品位热能、不同时间段热费的准确计量。(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.)

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:

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，t_h) 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 t_gThe water supply temperature of the water supply pipe is expressed in units of; t is t_hThe 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.s_vRepresents 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 the divided time period, and the unit is s; τ denotes a time period.

2. The method of modifying of claim 1, wherein said obtaining a temperature modification factor for each grade of heat energy produced in a different time period within a predetermined time period 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 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 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 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 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:

wherein, f (t)_h) The temperature correction coefficients of different grades of heat energy when the water supply temperature is constant are shown; p_iThe unit heat price of different grade heat energy calculated by the thermal power plant and the heat buying party is represented,the unit is Yuan/GJ; t is t_h，maxMaximum value of return water temperature, t, representing each grade of heat energy_h，minRepresents the minimum value of the return water temperature of each grade heat energy.

5. The method of modifying of claim 1, wherein obtaining the time modification factor for each grade heat energy supplied for a different time segment within a predetermined time segment 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 correction method according to claim 4, wherein said determining a time correction coefficient 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 intoAndτ is τ_a、τ_hAnd τ_l，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 τ_aThe cumulative thermal load in GJ;representing the peak time period tau_hThe cumulative thermal load in GJ;representing a valley period τ_lThe cumulative thermal load in GJ; delta tau is divided into tau_a2-τ_a1，τ_h2-τ_h1And τ_l2-τ_l1。

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:

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,t_h) 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 t_gThe water supply temperature of the water supply pipe is expressed in units of; t is t_hThe 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.s_vRepresents 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 the divided time period, and the 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:

wherein, f (t)_h) The temperature correction coefficients of different grades of heat energy when the water supply temperature is constant are shown; p_iThe 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 t_h,maxMaximum value of return water temperature, t, representing each grade of heat energy_h,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:

wherein the content of the first and second substances,is divided intoAndτ is τ_a、τ_hAnd τ_l，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 τ_aThe cumulative thermal load in GJ;representing the peak time period tau_hThe cumulative thermal load in GJ;representing a valley period τ_lThe cumulative thermal load in GJ; delta tau is divided into tau_a2-τ_a1，τ_h2-τ_h1And τ_l2-τ_l1。

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:

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,t_h) To representTemperature correction coefficient of each grade heat energy; f (tau) represents time correction coefficients of different time periods in a preset time period; t is t_gThe water supply temperature of the water supply pipe is expressed in units of; t is t_hThe 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.s_vRepresents 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:

wherein, P represents a heat rate; p₀Representing a unit heat base heat rate; t is t_gIndicating the water supply temperature of the water supply pipe; t is t_hThe 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.s_vRepresents 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:

wherein, f (t)_g,t_h) 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 plant_hThree different steps are divided, which are respectively:

a first step: when the temperature t of the return water_hMinimum value t of return water temperature smaller than different grade heat energy_h,minI.e. t_h＜t_h,min；

A second step: when the temperature t of the return water_hThe 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 grades_h,minAnd is less than or equal to the maximum value t of the return water temperature of different grade heat energy_h,maxI.e. t_h,min≤t_h≤t_h,max；

A third step: when the temperature t of the return water_hMaximum value t of return water temperature greater than different grade heat energy_h,maxI.e. t_h＞t_h,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:

wherein, f (t)_h) The temperature correction coefficients of different grades of heat energy when the water supply temperature is constant are shown; p_iThe 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 t_h,maxMaximum value of return water temperature, t, representing each grade of heat energy_h,minExpressing the heat energy of each gradeMinimum value of water temperature.

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 coefficient_h) Dependent on the temperature t of the return water_hLinearly 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 grades_h) 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 determined_g,t_h)。

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:

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 τ_h: when the heat time τ is within the peak period of the thermal load of the plant, i.e., τ_h1≤τ≤τ_h2；

Valley period τ_l: when the heat-using time τ is within the thermal load valley period of the plant, i.e., τ_l1≤τ≤τ_l2；

Mean time period τ_a: when the heat-using time τ is within the heat load leveling period of the plant, i.e., τ_a1≤τ≤τ_a2；

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:

wherein the content of the first and second substances,is divided intoAndτ is τ_a、τ_hAnd τ_l，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 τ_aThe cumulative thermal load in GJ;representing the peak time period tau_hThe cumulative thermal load in GJ;representing a valley period τ_lThe cumulative thermal load within; the unit is GJ; delta tau is divided into tau_a1-τ_a2，τ_h1-τ_h2And τ_l1-τ_l2。

Converting the calculation formula of the time correction coefficient, wherein the calculation formula of the time correction coefficient is as follows:

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 t_hWhen 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 water_hAt a temperature lower than 40 ℃, i.e. the return water temperature t_hWhen 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 t_hThe temperature correction coefficient f (t) is reduced because the heat power company should pay less fee_g,t_h) And is reduced accordingly. The agreement between the power plant and the heating power company is agreed, and when the return water temperature t is_hWhen 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 moment_g,t_h) The heat company does not pay the heat fee, which is 0.

Therefore, the temperature correction coefficient f (t) of the present invention_g,t_h) The specific values of (A) are shown as follows:

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 measured_hThree different steps are divided, which are respectively:

a first step: t is t_h＜40；

Second step：10≤t_h≤40；

A third step: t is t_h＞40。

A first step: when the temperature t of the return water_hThe 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 t_h＜10℃；

A second step: when the temperature t of the return water_hThe 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 ≤ t_h≤40；

A third step: when the temperature t of the return water_hThe maximum value of the return water temperature of different grade heat energy agreed by power plants and heat supply companies is 40 ℃, namely t_h＞40。

The cost and the return water temperature t of different step grade heat energy produced by the thermal power plant_hTemperature correction coefficient f (t) of thermovalence with linear change_g,t_h) Dependent on the temperature t of the return water_hThe 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 obtained_g,t_h) The calculation formula (c) is as follows:

the temperature correction coefficient f (t) for determining different step grades_g,t_h) The method can obtain the unit heat cost and the return water temperature t of the heat energy with different step grades in the invention_hTemperature correction coefficient f (t) in linear variation_g,t_h) 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.