CN112907028B - Heat exchange system transient working condition energy consumption analysis method based on energy potential of media - Google Patents
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Abstract
The invention discloses a method for analyzing energy consumption of transient working conditions of a heat exchange system based on energy potential of a working medium
And then obtaining the actual energy quality coefficient of the heat absorption of the working medium in the heat exchange system, and comparing the actual energy quality coefficient with the reference working condition energy quality coefficient of the heat absorption of the working medium in the heat exchange system, so as to evaluate the energy efficiency level of the transient working condition of the heat exchange system. The method can be used for evaluating the energy-saving potential of the heat exchange system under the transient working condition, and can be used for comparing and analyzing the control strategy performance of different heat exchange systems.
Description
Technical Field
The invention belongs to the field of thermodynamic system energy consumption analysis, and particularly relates to an energy consumption analysis method in a transient operation process of a heat exchange system.
Background
Since the 21 st century, the world energy structure is continuously developed and transformed in a clean, low-carbon, high-efficiency and multi-element direction. However, due to the strong time-varying characteristics of renewable energy sources such as wind energy, solar energy and the like, the renewable energy sources in China are difficult to generate and consume, and the problems of wind and light abandon are serious. The method improves the operation flexibility of the conventional heat energy power system, provides consumption service for power generation of renewable energy sources, and is an important technical direction. Taking coal-fired power generation as an example, the coal-fired power generation is changed from main energy to basic energy, and the variable load amplitude and variable load frequency of a coal-fired power generating set are gradually improved. Therefore, the thermal energy power system is in a transient condition with frequent variable load for a long time.
The priority of energy conservation is a long-standing strategy for the development of the economic society in China, and the heat energy power system is required to have high energy utilization efficiency on the premise of flexible operation. The heat exchange system is an important component of the thermal power system and is also a key influencing the high efficiency and flexibility of the thermal power system. However, the energy efficiency evaluation method of the existing heat exchange system is based on the first law of thermodynamics and on the concept of steady state, and is difficult to be used for analyzing the energy consumption of the heat exchange system under the transient working condition.
Disclosure of Invention
In order to evaluate the energy efficiency level of the heat exchange system under the transient working condition, the invention aims to provide a method for analyzing the energy consumption of the heat exchange system under the transient working condition based on the energy potential of a working medium, wherein the method adopts the energy mass coefficient of the working medium to calculate and analyze the energy efficiency of the heat exchange system under the transient working condition, and can evaluate the real-time performance of the heat exchange system under the transient working condition; the method can be used for analyzing and adopting the energy consumption characteristics of the heat exchange system which operates frequently with variable load, and can also be used for evaluating and comparing the energy consumption control levels of different control systems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for analyzing energy consumption of a heat exchange system under transient working conditions based on energy potential of a working medium utilizes an actual energy mass coefficient A of the working medium under the transient working conditions to absorb heat in the heat exchange system 1 Reference energy mass coefficient A absorbing heat with reference working condition working medium in heat exchange system 0 Analyzing the energy efficiency level of the transient working condition of the heat exchange system; the method comprises the following specific steps:
1) Acquiring operation data of a heat exchange system, acquiring the temperature and pressure of n working medium flows in and out of the heat exchange system, and further calculating according to the thermophysical properties of the working medium to obtain the enthalpy h when the ith working medium under the transient working condition enters the heat exchange system in,i Enthalpy h of ith working medium absorbing heat in heat exchange system under transient working condition out,i And when the ith working medium under transient working condition enters the heat exchange system
e in,i And transient working condition i-th working medium after absorbing heat in heat exchange system
e out,i ；
2) Calculating transient operating conditions of heat exchange system
Load E 0 ：
In the formula: e.g. of the type in,i When the ith working medium enters the heat exchange system under transient working condition
kJ/kg；e out,i For transient working condition after i-th working medium absorbs heat in heat exchange system
kJ/kg；D i The mass flow of the ith working medium under the transient working condition is kg/s;
3) Calculating the actual energy quality coefficient A of transient working condition working medium absorbing heat in the heat exchange system 1 ：
In the formula: h is in,i The enthalpy of the ith working medium entering the heat exchange system under the transient working condition is kJ/kg; h is out,i The enthalpy of the ith working medium under the transient working condition after absorbing heat in the heat exchange system is kJ/kg;
4) The reference working condition refers to that the heat exchange system is in
Load E 0 Operating conditions in steady-state operation, i.e. of the reference condition
A load of E 0 ：
In the formula: e.g. of the type in0,i When the ith working medium enters the heat exchange system under the reference working condition
kJ/kg；e out0,i For standard working condition after heat absorption of i-th working medium in heat exchange system
kJ/kg；D 0i The mass flow of the ith working medium under the reference working condition is kg/s;
further, a reference energy quality coefficient A of the heat absorption of the working medium under the reference working condition in the heat exchange system is calculated 0 ：
In the formula: h is in0,i The enthalpy of the ith working medium under the reference working condition when the ith working medium enters a heat exchange system is kJ/kg; h is out0,i Enthalpy after the ith working medium absorbs heat in the heat exchange system under the reference working condition, kJ/kg;
5) Calculating the efficiency deviation of the transient working condition heat exchange system efficiency compared with the reference working condition:
in the formula: δ η is the relative variation of the energy efficiency of the heat exchange system compared with the reference working condition;
6) And quantitatively evaluating the energy efficiency level of the transient working condition of the heat exchange system by using the delta eta, wherein the larger the delta eta is, the worse the energy efficiency of the transient working condition of the heat exchange system is, and the larger the energy-saving potential is.
According to the method for analyzing the energy consumption of the heat exchange system under the transient working condition based on the energy potential of the working medium, when the flow D of the ith working medium under the actual transient working condition i When the measurement is difficult, the following method is adopted for processing:
1) Calculating the share k of the ith working medium under the reference working condition 0i ：
D 0max ＝Max(D 0i )
In the formula: d 0max The maximum mass flow of all working media entering and exiting the heat exchange system under the reference working condition is kg/s;
2) Transient working condition ith working medium share k i Using the ith working medium share k under the reference working condition 0i Instead, namely:
k i ＝k 0i
3) Calculating the actual energy quality coefficient of the transient working condition working medium absorbing heat in the heat exchange system by using the following formula:
4) Calculating the efficiency deviation of the transient working condition heat exchange system efficiency compared with the reference working condition:
in the formula: δ η is the relative variation of the energy efficiency of the heat exchange system compared with the reference working condition;
5) And quantitatively evaluating the energy efficiency level of the transient working condition of the heat exchange system by using the delta eta, wherein the larger the delta eta is, the worse the energy efficiency of the transient working condition of the heat exchange system is, and the larger the energy-saving potential is.
The method for analyzing energy consumption of transient working condition of heat exchange system based on energy potential of working medium, and the working medium
The calculated reference temperature and pressure are taken as ambient temperature and ambient pressure, respectively.
According to the method for analyzing the energy consumption of the transient working condition of the heat exchange system based on the energy potential of the working medium, the reference working condition parameter is obtained by testing under the condition of keeping the parameter stable.
According to the method for analyzing the energy consumption of the transient working condition of the heat exchange system based on the energy potential of the media, when the heat exchange system is positioned in the heat energy power system, the efficiency deviation delta eta of the heat energy power system s The efficiency deviation delta eta of the heat exchange system is the same, namely:
δη s ＝δη。
THE ADVANTAGES OF THE PRESENT INVENTION
(1) The invention can obtain the energy efficiency level of the transient working condition of the heat exchange system;
(2) The method only needs to test pressure, temperature and other thermal parameters and flow and can be replaced by a reference working condition, so that the method has low test cost for testing the energy consumption of the heat exchange system.
Drawings
FIG. 1 is a schematic diagram of an energy consumption analysis method based on transient working conditions of a heat exchange system of the energy potential of a medium.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
As shown in figure 1, the method for analyzing the energy consumption of the transient working condition of the heat exchange system based on the energy potential of the working medium utilizes the actual energy-mass coefficient A of the transient working condition working medium absorbing heat in the heat exchange system 1 Reference energy quality coefficient A absorbing heat with reference working condition working medium in heat exchange system 0 Analyzing the energy efficiency level of the transient working condition of the heat exchange system; the method comprises the following specific steps:
1) Acquiring operation data of a heat exchange system, acquiring the temperature and pressure of n working medium flows in and out of the heat exchange system, and further calculating according to the thermophysical properties of the working medium to obtain the enthalpy h when the ith working medium under the transient working condition enters the heat exchange system in,i And enthalpy h of ith working medium under transient working condition after heat absorption in heat exchange system out,i And when the ith working medium under transient working condition enters the heat exchange system
e in,i And transient working condition i-th working medium after absorbing heat in heat exchange system
e out,i ；
2) Calculating transient operating conditions of heat exchange system
Load E 0 ：
In the formula: e.g. of the type in,i When the ith working medium enters the heat exchange system under transient working condition
kJ/kg；e out,i For transient working condition after i-th working medium absorbs heat in heat exchange system
kJ/kg；D i The mass flow of the ith working medium under the transient working condition is kg/s;
3) Calculating the actual energy quality coefficient A of transient working condition working medium absorbing heat in the heat exchange system 1 ：
In the formula: h is in,i The enthalpy is kJ/kg when the ith working medium enters a heat exchange system under the transient working condition; h is out,i The enthalpy of the ith working medium under the transient working condition after absorbing heat in the heat exchange system is kJ/kg;
4) The reference working condition refers to that the heat exchange system is in
Load E 0 Operating conditions in steady-state operation, i.e. of the reference condition
A load of E 0 ：
In the formula: e.g. of the type in0,i When the ith working medium enters the heat exchange system under the reference working condition
kJ/kg；e out0,i For standard working condition after heat absorption of i-th working medium in heat exchange system
kJ/kg；D 0i The mass flow of the ith working medium under the reference working condition is kg/s;
further, a reference energy quality coefficient A of the heat absorption of the working medium under the reference working condition in the heat exchange system is calculated 0 ：
In the formula: h is in0,i The enthalpy of the ith working medium under the reference working condition when the ith working medium enters a heat exchange system is kJ/kg; h is out0,i Enthalpy after the ith working medium absorbs heat in the heat exchange system under the reference working condition, kJ/kg;
5) Calculating the efficiency deviation of the transient working condition heat exchange system efficiency compared with the reference working condition:
in the formula: δ η is the relative variation of the energy efficiency of the heat exchange system compared with the reference working condition;
6) And quantitatively evaluating the energy efficiency level of the transient working condition of the heat exchange system by using the delta eta, wherein the larger the delta eta is, the worse the energy efficiency of the transient working condition of the heat exchange system is, and the larger the energy-saving potential is.
According to the method for analyzing the energy consumption of the heat exchange system under the transient working condition based on the energy potential of the working medium, when the flow D of the ith working medium under the actual transient working condition i When the measurement is difficult, the following method is adopted for processing:
1) Calculating the share k of the ith working medium under the reference working condition 0i ：
D 0max ＝Max(D 0i )
In the formula: d 0max The maximum mass flow of all working media entering and exiting the heat exchange system under the reference working condition is kg/s;
2) Transient working condition ith working medium share k i Using the ith working medium share k under the reference working condition 0i Instead, namely:
k i ＝k 0i
3) Calculating the actual energy quality coefficient of the transient working condition working medium absorbing heat in the heat exchange system by using the following formula:
4) Calculating the efficiency deviation of the transient working condition heat exchange system efficiency compared with the reference working condition:
in the formula: delta eta is the relative variation of the energy efficiency of the heat exchange system compared with the reference working condition;
5) And quantitatively evaluating the energy efficiency level of the transient working condition of the heat exchange system by using the delta eta, wherein the larger the delta eta is, the worse the energy efficiency of the transient working condition of the heat exchange system is, and the larger the energy-saving potential is.
Working substances as preferred embodiments of the invention
The calculated reference temperature and pressure are taken as ambient temperature and ambient pressure, respectively.
As a preferred embodiment of the invention, the reference working condition parameters are obtained by testing under the condition of keeping the parameters stable.
As a preferred embodiment of the invention, when the heat exchange system is in a thermal power system, the efficiency deviation delta eta of the thermal power system s The same as the efficiency deviation δ η of the heat exchange system, namely:
δη s ＝δη。
Claims (5)
1. a method for analyzing energy consumption of a heat exchange system under transient working conditions based on energy potential of a medium is characterized by comprising the following steps: actual energy quality coefficient A for absorbing heat in heat exchange system by using working medium under transient working condition 1 Reference energy quality coefficient A absorbing heat with reference working condition working medium in heat exchange system 0 Analyzing the energy efficiency level of the transient working condition of the heat exchange system; the method comprises the following specific steps:
1) Acquiring operation data of a heat exchange system, acquiring the temperature and pressure of n working medium flows in and out of the heat exchange system, and further calculating according to the thermophysical properties of the working medium to obtain the enthalpy h when the ith working medium under the transient working condition enters the heat exchange system in,i Enthalpy h of ith working medium absorbing heat in heat exchange system under transient working condition out,i And when the ith working medium under transient working condition enters the heat exchange system
And transient working condition i-th working medium after absorbing heat in heat exchange system
2) Calculating transient operating conditions of heat exchange system
Load E 0 ：
In the formula: e.g. of the type in,i When the ith working medium enters the heat exchange system under transient working condition
kJ/kg；e out,i For transient working condition after i-th working medium absorbs heat in heat exchange system
kJ/kg；D i The mass flow of the ith working medium under the transient working condition is kg/s;
3) Calculating the actual energy quality coefficient A of transient working condition working medium absorbing heat in the heat exchange system 1 ：
In the formula: h is in,i The enthalpy of the ith working medium entering the heat exchange system under the transient working condition is kJ/kg; h is out,i The enthalpy of the ith working medium under the transient working condition after absorbing heat in the heat exchange system is kJ/kg;
4) The reference working condition refers to that the heat exchange system is in
Load E 0 Operating conditions in steady-state operation, i.e. of the reference condition
A load of E 0 ：
In the formula: e.g. of the type in0,i When the ith working medium enters the heat exchange system under the reference working condition
kJ/kg；e out0,i For standard working condition after heat absorption of i-th working medium in heat exchange system
kJ/kg；D 0i The mass flow of the ith working medium under the reference working condition is kg/s;
further, a reference energy mass coefficient A of the heat absorption of the reference working condition working medium in the heat exchange system is calculated 0 ：
In the formula: h is in0,i The enthalpy of the ith working medium under the reference working condition when entering a heat exchange system is kJ/kg; h is out0,i Enthalpy after the ith working medium absorbs heat in the heat exchange system under the reference working condition, kJ/kg;
5) Calculating the efficiency deviation of the transient working condition heat exchange system efficiency compared with the reference working condition:
in the formula: δ η is the relative variation of the energy efficiency of the heat exchange system compared with the reference working condition;
6) And quantitatively evaluating the energy efficiency level of the transient working condition of the heat exchange system by using the delta eta, wherein the larger the delta eta is, the worse the energy efficiency of the transient working condition of the heat exchange system is, and the larger the energy-saving potential is.
2. The method for analyzing energy consumption of transient working condition of heat exchange system based on energy potential of working medium as claimed in claim 1, wherein when the flow D of the ith working medium under actual transient working condition i When the measurement is difficult, the following method is adopted for processing:
1) Calculating the share k of the ith working medium under the reference working condition 0i ：
D 0max ＝Max(D 0i )
In the formula: d 0max To work on the basis ofThe maximum mass flow of working media entering and exiting the heat exchange system under all conditions is kg/s;
2) Transient working condition ith working medium share k i Using the ith working medium share k under the reference working condition 0i Instead, namely:
k i ＝k 0i
3) Calculating the actual energy mass coefficient of the transient working condition working medium absorbing heat in the heat exchange system, and calculating by using the following formula:
4) Calculating the efficiency deviation of the transient working condition heat exchange system efficiency compared with the reference working condition:
in the formula: delta eta is the relative variation of the energy efficiency of the heat exchange system compared with the reference working condition;
5) And quantitatively evaluating the energy efficiency level of the transient working condition of the heat exchange system by using the delta eta, wherein the larger the delta eta is, the worse the energy efficiency of the transient working condition of the heat exchange system is, and the larger the energy-saving potential is.
3. The method for analyzing the energy consumption of the transient working condition of the heat exchange system based on the energy potential of the media according to claim 1, wherein the method comprises the following steps: working medium
The calculated reference temperature and pressure are taken as ambient temperature and ambient pressure, respectively.
4. The method for analyzing the energy consumption of the transient working condition of the heat exchange system based on the energy potential of the media according to claim 1, wherein the method comprises the following steps: and testing the reference working condition parameters under the condition of keeping the parameters stable.
5. The method of claim 1, wherein the energy potential of the energy source is based on a working mediumThe method for analyzing the energy consumption of the heat exchange system under the transient working condition is characterized by comprising the following steps: when the heat exchange system is in the thermal power system, the efficiency deviation delta eta of the thermal power system s The efficiency deviation delta eta of the heat exchange system is the same, namely:
δη s ＝δη。
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