CN112907028A - Heat exchange system transient working condition energy consumption analysis method based on energy potential of media - Google Patents

Heat exchange system transient working condition energy consumption analysis method based on energy potential of media Download PDF

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CN112907028A
CN112907028A CN202110066255.8A CN202110066255A CN112907028A CN 112907028 A CN112907028 A CN 112907028A CN 202110066255 A CN202110066255 A CN 202110066255A CN 112907028 A CN112907028 A CN 112907028A
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刘明
严俊杰
王朝阳
种道彤
刘继平
邢秦安
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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
Figure DDA0002904270470000011
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

Heat exchange system transient working condition energy consumption analysis method based on energy potential of media
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 invention 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 system1Reference energy quality coefficient A absorbing heat with reference working condition working medium in heat exchange system0Analyzing 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 systemin,iAnd enthalpy h of ith working medium under transient working condition after heat absorption in heat exchange systemout,iAnd when the ith working medium under transient working condition enters the heat exchange system
Figure BDA0002904270450000024
ein,iAnd transient working condition i-th working medium after absorbing heat in heat exchange system
Figure BDA0002904270450000025
eout,i；
2) Calculating transient operating conditions of heat exchange system
Figure BDA0002904270450000026
Load E0：
Figure BDA0002904270450000021
In the formula: e.g. of the typein,iWhen the ith working medium enters the heat exchange system under transient working condition
Figure BDA0002904270450000027
kJ/kg；eout,iFor transient working condition after i-th working medium absorbs heat in heat exchange system
Figure BDA0002904270450000023
kJ/kg；DiIs as followsMass flow of i strands of working media under transient working conditions is kg/s;
3) calculating the actual energy quality coefficient A of transient working condition working medium absorbing heat in the heat exchange system1：
Figure BDA0002904270450000022
In the formula: h isin,iThe enthalpy of the ith working medium entering the heat exchange system under the transient working condition is kJ/kg; h isout,iThe 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
Figure BDA0002904270450000034
Load E0Operating conditions in steady-state operation, i.e. of the reference condition
Figure BDA0002904270450000035
A load of E0：
Figure BDA0002904270450000031
In the formula: e.g. of the typein0,iWhen the ith working medium enters the heat exchange system under the reference working condition
Figure BDA0002904270450000036
kJ/kg；eout0,iFor standard working condition after heat absorption of i-th working medium in heat exchange system
Figure BDA0002904270450000037
kJ/kg；D0iThe 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 calculated0：
Figure BDA0002904270450000032
In the formula: h isin0,iThe 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 isout0,iEnthalpy 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:
Figure BDA0002904270450000033
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 conditioniWhen 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 condition0i：
Figure BDA0002904270450000041
D0max＝Max(D0i)
In the formula: d0maxThe 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 kiUsing the ith working medium share k under the reference working condition0iInstead, namely:
ki＝k0i
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:
Figure BDA0002904270450000042
4) calculating the efficiency deviation of the transient working condition heat exchange system efficiency compared with the reference working condition:
Figure BDA0002904270450000043
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
Figure BDA0002904270450000044
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 parameters are obtained by testing under the condition of keeping the parameters 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 medium, when the heat exchange system is positioned in a heat energy power system, the efficiency deviation delta eta of the heat energy power systemsThe efficiency deviation delta eta of the heat exchange system is the same, namely:
δηs＝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 present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in FIG. 1, the method for analyzing energy consumption of heat exchange system under transient working condition based on energy potential of working medium utilizes actual energy quality coefficient A of heat absorption of working medium under transient working condition in heat exchange system1Reference energy quality coefficient A absorbing heat with reference working condition working medium in heat exchange system0Analyzing 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 systemin,iAnd enthalpy h of ith working medium under transient working condition after heat absorption in heat exchange systemout,iAnd when the ith working medium under transient working condition enters the heat exchange system
Figure BDA0002904270450000051
ein,iAnd transient working condition i-th working medium after absorbing heat in heat exchange system
Figure BDA0002904270450000052
eout,i；
2) Calculating transient operating conditions of heat exchange system
Figure BDA0002904270450000065
Load E0：
Figure BDA0002904270450000061
In the formula: e.g. of the typein,iWhen the ith working medium enters the heat exchange system under transient working condition
Figure BDA00029042704500000611
kJ/kg；eout,iFor transient working condition after i-th working medium absorbs heat in heat exchange system
Figure BDA0002904270450000066
kJ/kg；DiThe 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 system1：
Figure BDA0002904270450000062
In the formula: h isin,iThe enthalpy of the ith working medium entering the heat exchange system under the transient working condition is kJ/kg; h isout,iThe 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
Figure BDA0002904270450000067
Load E0Operating conditions in steady-state operation, i.e. of the reference condition
Figure BDA0002904270450000068
A load of E0：
Figure BDA0002904270450000063
In the formula: e.g. of the typein0,iWhen the ith working medium enters the heat exchange system under the reference working condition
Figure BDA0002904270450000069
kJ/kg；eout0,iFor standard working condition after heat absorption of i-th working medium in heat exchange system
Figure BDA00029042704500000610
kJ/kg；D0iThe 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 calculated0：
Figure BDA0002904270450000064
In the formula: h isin0,iThe 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 isout0,iEnthalpy 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:
Figure BDA0002904270450000071
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 conditioniWhen 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 condition0i：
Figure BDA0002904270450000072
D0max＝Max(D0i)
In the formula: d0maxThe 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 kiUsing the ith working medium share k under the reference working condition0iInstead, namely:
ki＝k0i
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:
Figure BDA0002904270450000073
4) calculating the efficiency deviation of the transient working condition heat exchange system efficiency compared with the reference working condition:
Figure BDA0002904270450000081
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.
Working substances as preferred embodiments of the invention
Figure BDA0002904270450000082
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 systemsThe efficiency deviation delta eta of the heat exchange system is the same, namely:
δηs＝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 condition1Reference energy quality coefficient A absorbing heat with reference working condition working medium in heat exchange system0Analyzing the energy efficiency level of the transient working condition of the heat exchange system; the method comprises the following specific steps:
1) collecting operation data of a heat exchange system, obtaining the temperature and pressure of n working medium flows in and out of the heat exchange system, and further obtaining the ith working medium inlet exchange under the transient working condition according to the thermophysical calculation of the working mediumEnthalpy of heat system hin,iAnd enthalpy h of ith working medium under transient working condition after heat absorption in heat exchange systemout,iAnd when the ith working medium under transient working condition enters the heat exchange system
Figure FDA0002904270440000011
And transient working condition i-th working medium after absorbing heat in heat exchange system
Figure FDA0002904270440000012
2) Calculating transient operating conditions of heat exchange system
Figure FDA0002904270440000013
Load E0：
Figure FDA0002904270440000014
In the formula: e.g. of the typein,iWhen the ith working medium enters the heat exchange system under transient working condition
Figure FDA0002904270440000015
kJ/kg；eout,iFor transient working condition after i-th working medium absorbs heat in heat exchange system
Figure FDA0002904270440000016
kJ/kg；DiThe 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 system1：
Figure FDA0002904270440000017
In the formula: h isin,iThe enthalpy of the ith working medium entering the heat exchange system under the transient working condition is kJ/kg; h isout,iThe enthalpy of the ith working medium after absorbing heat in the heat exchange system under the transient working condition，kJ/kg；
4) The reference working condition refers to that the heat exchange system is in
Figure FDA0002904270440000018
Load E0Operating conditions in steady-state operation, i.e. of the reference condition
Figure FDA0002904270440000021
A load of E0：
Figure FDA0002904270440000022
In the formula: e.g. of the typein0,iWhen the ith working medium enters the heat exchange system under the reference working condition
Figure FDA0002904270440000023
kJ/kg；eout0,iFor standard working condition after heat absorption of i-th working medium in heat exchange system
Figure FDA0002904270440000024
kJ/kg；D0iThe 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 calculated0：
Figure FDA0002904270440000025
In the formula: h isin0,iThe 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 isout0,iEnthalpy 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:
Figure FDA0002904270440000026
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 conditioniWhen 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 condition0i：
Figure FDA0002904270440000027
D0max＝Max(D0i)
In the formula: d0maxThe 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 kiUsing the ith working medium share k under the reference working condition0iInstead, namely:
ki＝k0i
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:
Figure FDA0002904270440000031
4) calculating the efficiency deviation of the transient working condition heat exchange system efficiency compared with the reference working condition:
Figure FDA0002904270440000032
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.
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
Figure FDA0002904270440000033
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 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: when the heat exchange system is in the thermal power system, the efficiency deviation delta eta of the thermal power systemsThe efficiency deviation delta eta of the heat exchange system is the same, namely:
δηs＝δη。
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CN108520336A (en) * 2018-03-22 2018-09-11 西安交通大学 A kind of coal unit peak regulation transient process coal consumption analysis method
CN109856966A (en) * 2019-03-13 2019-06-07 西安交通大学 It is a kind of meter and coal-burning boiler store the modified transient state varying duty Limestone control method of *

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CN103678915A (en) * 2013-12-12 2014-03-26 广东电网公司电力科学研究院 Thermal power plant generator set varying duty energy consumption analysis method based on approach method
CN108520336A (en) * 2018-03-22 2018-09-11 西安交通大学 A kind of coal unit peak regulation transient process coal consumption analysis method
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CN117029910A (en) * 2023-07-26 2023-11-10 秦皇岛秦热发电有限责任公司 Enthalpy exergy monitoring device for thermodynamic system

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