CN113587208A - Online quantitative calculation method and system for energy storage of steam pipe network - Google Patents
Online quantitative calculation method and system for energy storage of steam pipe network Download PDFInfo
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Abstract
The invention discloses an online quantitative calculation method and system for energy storage of a steam pipe network, belonging to the field of cogeneration. The energy storage of the steam pipe network is calculated according to the following steps: collecting real-time pressure of a plurality of sections of the steam pipe network, and calculating the total amount of steam which can be used for peak regulation by the steam pipe network; calculating the total amount of steam released in the adjusting process of the steam pipe network; calculating the auxiliary peak regulation capacity of the steam pipe network; and obtaining the maximum peak-shaving power and the release peak-shaving power of the steam pipe network according to the adjusting time of the heat supply adjusting valve. The method can obtain accurate calculation of the stored energy of the steam pipe network, and is used for assisting the peak shaving and frequency modulation of the unit so as to realize quick variable load of the unit; and the device has low cost investment and high unit flexibility.
Description
Technical Field
The invention belongs to the field of cogeneration, and relates to an online quantitative calculation method and system for energy storage of a steam pipe network.
Background
The cogeneration and the centralized heat supply are important measures for improving urban environment, urban atmospheric quality and urban modernization level, have good social benefit, environmental benefit and better economic benefit, and meet the policy requirements of energy conservation and emission reduction. With the rapid development of economy and urbanization, the industrial steam demand is continuously increased, and part of thermal power enterprises actively develop a heat supply market for fully utilizing the superiority of cogeneration, and develop heat supply transformation projects of steam turbine units according to local conditions and plant conditions so as to improve the high-efficiency clean development level. Considering the self survival and the industrial steam demand of the surrounding chemical industry park, the external supply of the industrial steam by the steam turbine is the requirement of the situation, is a means of creating income and is a necessary work for guaranteeing the survival in the intense market competition.
However, recently, in order to increase the margin for consuming new energy power, the demand for flexibility of the thermal power generating unit is continuously increased. In order to match the development requirement of renewable energy power generation on-line, the power grid requires the thermal power plant to improve the peak regulation capability. Therefore, it is important to actively develop a traditional power generation technology represented by coal-fired power generation to actively assist in absorbing new energy, and more importantly, to fully excavate and utilize the energy storage link of the thermal power generating unit. Relevant researches show that a steam pipe network associated with the cogeneration unit has large energy storage capacity and thermal inertia, and the heat supply network is used for storing energy in a short time without causing perceivable influence on heat users. The heat supply unit can deal with load change in a short time based on the part of stored energy, and the flexibility of the unit is improved. However, the prior art is lack of research on the energy storage characteristic of the heat supply network, so that the research on the energy storage characteristic of the heat supply network of the unit is carried out, and the method has important significance for improving the flexibility of the unit.
Disclosure of Invention
The invention aims to overcome the defect that the prior art is lack of research on the energy storage characteristics of a heat supply network in the prior art, and provides an online quantitative calculation method for the energy storage of a steam pipe network.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
an online quantitative calculation method for energy storage of a steam pipe network is characterized in that a heat supply regulating valve is installed on the steam pipe network;
the online quantitative calculation method for the energy storage of the steam pipe network comprises the following steps:
step 1) acquiring real-time operation data of a steam pipe network, wherein the real-time operation data comprises real-time steam pressure and steam quality of any pipe section;
step 2) calculating the total amount of steam used for peak shaving of the steam pipe network based on real-time operation data of the steam pipe network;
calculating the total amount of steam released in the adjusting process of the steam pipe network based on the real-time operation data of the steam pipe network;
step 3) calculating to obtain the auxiliary peak shaving capacity of the steam pipe network based on the total amount of steam used for peak shaving of the steam pipe network and the total amount of steam released in the regulation process of the steam pipe network;
and 4) calculating to obtain the maximum peak regulating power and the release peak regulating power of the steam pipe network based on the auxiliary peak regulating capacity of the steam pipe network and in combination with the regulating time of the heat supply regulating valve.
Preferably, the total amount of steam used for peak shaving in the steam pipe network in step 1) is:
in formula (1): m isGeneral assemblyIs the total amount of steam available for peak shaving, kg; piI, steam pressure of a steam pipe section, MPa; pi-minI is the lowest allowable steam pressure of the steam pipe section, MPa;mithe mass of steam in the ith steam pipe section is kg;
in the formula (2), mReleasingThe total amount of steam released in the process of regulating the steam pipe network is kg; pi1Adjusting the steam pressure of the steam pipe section i after the steam pressure is adjusted to be MPa;
in the step 3), the auxiliary peak regulation capacity of the steam pipe network comprises the maximum peak regulation capacity and the release peak regulation capacity of the steam pipe network;
ΔEmaximum of＝mGeneral assembly(h1-hn) (3)
ΔEReleasing＝mReleasing(h1-hn) (4)
In the formula: delta EMaximum ofFor maximum peak shaving capacity, Δ E, of steam pipe networkReleasingTo release the peak shaving ability, h1Supplying heat to the steam turbine (2) and extracting the steam enthalpy value of the steam port, kJ/kg; h isnIs the exhaust enthalpy value of the steam turbine (2), kJ/kg.
Preferably, the specific calculation process of step 4) is:
in the formula,. DELTA.PeMaximum ofAt maximum peak shaver power, Δ PeReleasingTo release the peak shaver power, t1The regulating time of the heat supply regulating valve is adjusted.
Preferably, when mReleasing＝KmGeneral assemblyAnd when K is less than or equal to 0.9, K is a safety margin, and the opening degree of the heat supply regulating valve is increased until the steam pipe section i reaches the lowest allowable steam pressure.
Preferably, the lowest allowable steam pressure of the steam pipe section is calculated by a section which is farthest from a heat supply steam extraction port of the steam turbine in a plurality of steam section volume sections based on a simulation method of a steam pipe network;
the simulation of the steam pipe network is carried out based on a steam pipe network simulation model established by the actual structure and the operation data of the steam pipe network.
Preferably, the steam quality of any pipe section is calculated by the pressure, temperature and volume of the corresponding steam pipe section under normal working conditions.
An online quantitative calculation system for energy storage of a steam pipe network is characterized in that a heat supply regulating valve is installed on the steam pipe network;
the online quantitative calculation system of steam pipe network energy storage includes:
the data acquisition module is used for acquiring real-time operation data of the steam pipe network, wherein the real-time operation data comprises the adjusting time of the heat supply adjusting valve, the real-time steam pressure and the steam quality of any pipe section;
and the online energy storage calculation module is interacted with the data acquisition module, and is used for calculating to obtain the total amount of steam used for peak shaving of the steam pipe network and the total amount of steam released in the regulation process of the steam pipe network based on the received real-time operation data of the steam pipe network, and further obtaining the maximum peak shaving power and the released peak shaving power of the steam pipe network.
Preferably, the system further comprises a control module, the control module is interacted with the online energy storage calculation module, and the opening degree of the heat supply regulating valve is controlled based on the relation between the total amount of the steam used for peak shaving by the steam pipe network and the total amount of the steam released in the regulation process of the steam pipe network.
Preferably, the data acquisition module comprises a plurality of high-speed pressure sensors for measuring the real-time steam pressure of any pipe section;
the data acquisition module and the online energy storage calculation module are transmitted through a 5G network transmission line.
Preferably, the online energy storage calculation module comprises a plurality of PLC controllers which are integrally assembled.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses an online quantitative calculation method for energy storage of a steam pipe network. The energy storage of the steam pipe network is calculated according to the following steps: collecting real-time pressure of a plurality of sections of the steam pipe network, and calculating the total amount of steam which can be used for peak regulation by the steam pipe network; calculating the total amount of steam released in the adjusting process of the steam pipe network; calculating the auxiliary peak regulation capacity of the steam pipe network; and obtaining the maximum peak-shaving power and the release peak-shaving power of the steam pipe network according to the adjusting time of the heat supply adjusting valve. The method can obtain accurate calculation of the stored energy of the steam pipe network, and is used for assisting the peak shaving and frequency modulation of the unit so as to realize quick variable load of the unit; and the device has low cost investment and high unit flexibility.
The invention also discloses an online quantitative calculation system for the energy storage of the steam pipe network, which comprises a data acquisition module, a data storage module and a data processing module, wherein the data acquisition module is used for acquiring real-time operation data of the steam pipe network, and the real-time operation data comprises the adjustment time of the heat supply adjusting valve, the real-time steam pressure and the steam quality of any pipe section; and the online energy storage calculation module is interacted with the data acquisition module, and is used for calculating to obtain the total amount of steam used for peak shaving of the steam pipe network and the total amount of steam released in the regulation process of the steam pipe network based on the received real-time operation data of the steam pipe network, and further obtaining the maximum peak shaving power and the released peak shaving power of the steam pipe network.
Furthermore, a pressure measuring point of the steam pipe network is a high-speed pressure sensor, and a pressure measuring point signal is transmitted by adopting a 5G network, so that the pressure transmission speed is ensured; the lowest allowable steam pressure of the steam pipe section is determined by the section which is farthest from the heat supply steam extraction port of the steam turbine in the volume sections of the steam sections, and the steam can be obtained through simulation of a steam pipe network, so that the safety of the steam heat supply network is ensured, and the steam demand of a user is met; the online energy storage calculation module of the heat supply network is integrated by adopting a PLC and is communicated with a DCS (distributed control system) of an industrial steam cogeneration system, so that the application of the online quantitative calculation system of the energy storage of the steam pipe network in production practice is ensured.
Drawings
FIG. 1 is a schematic block diagram of a cogeneration system for industrial steam;
FIG. 2 is a schematic flow chart of an online quantitative calculation method for energy storage of a steam pipe network;
in the figure: 1-a boiler; 2-a steam turbine; 3-a condenser; 4-a condensate pump; 5-a low-pressure heater; 6-a deaerator; 7-a feed pump; 8-a high pressure heater; 9-heating regulating valve; 10-steam pipe network. P1、P2……Pn-1、PnIs the online pressure of 1-n steam net pipe sections; v1、V2……Vn-1、VnIs the volume of 1-n steam net pipe sections.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
example 1
An online quantitative calculation method for energy storage of a steam pipe network is characterized in that a heat supply regulating valve is installed on the steam pipe network;
the online quantitative calculation method for the energy storage of the steam pipe network comprises the following steps:
step 1) acquiring real-time operation data of a steam pipe network, wherein the real-time operation data comprises real-time steam pressure and steam quality of any pipe section;
step 2) calculating the total amount of steam used for peak shaving of the steam pipe network based on real-time operation data of the steam pipe network;
calculating the total amount of steam released in the adjusting process of the steam pipe network based on the real-time operation data of the steam pipe network;
step 3) calculating to obtain the auxiliary peak shaving capacity of the steam pipe network based on the total amount of steam used for peak shaving of the steam pipe network and the total amount of steam released in the regulation process of the steam pipe network;
and 4) calculating to obtain the maximum peak regulating power and the release peak regulating power of the steam pipe network based on the auxiliary peak regulating capacity of the steam pipe network and in combination with the regulating time of the heat supply regulating valve.
Example 2
An online quantitative calculation method for energy storage of a steam pipe network comprises the following steps:
the energy storage of the steam pipe network is calculated according to the following steps:
(1) calculating the total amount of steam used for peak shaving of the steam pipe network:
collecting the real-time pressure of n sections of the steam pipe network, and calculating the total amount of steam which can be used for peak regulation of the steam pipe network:
in formula (1): m isGeneral assemblyIs the total amount of steam available for peak shaving, kg; piI, steam pressure of a steam pipe section, MPa; pi-minI is the lowest allowable steam pressure of the steam pipe section, MPa; m isiThe mass of steam in the ith steam pipe section is kg;
(2) calculating the total amount of steam released by the steam pipe network:
collecting the real-time pressure of n sections of the steam pipe network to obtain the total amount of steam released in the regulation process of the steam pipe network,
in the formula (2), mReleasingThe total amount of steam released in the process of regulating the steam pipe network is kg; pi1Adjusting the steam pressure of the steam pipe section i after the steam pressure is adjusted to be MPa;
(3) calculating the auxiliary peak regulation capacity of the steam pipe network: the auxiliary peak regulation capacity of the steam pipe network comprises the maximum peak regulation capacity and the release peak regulation capacity of the steam pipe network;
the maximum peak regulation capacity and the peak regulation releasing capacity of the steam pipe network are calculated as follows:
ΔEmaximum of＝mGeneral assembly(h1-hn) (3)
ΔEReleasing＝mReleasing(h1-hn) (4)
In the formula: delta EMaximum ofFor maximum peak shaving capacity, Δ E, of steam pipe networkReleasingTo release the peak shaving ability, h1Supplying heat to the steam turbine (2) and extracting the steam enthalpy value of the steam port, kJ/kg; h isnIs the exhaust enthalpy value of the steam turbine (2), kJ/kg.
The specific calculation process of the maximum peak regulation power and the release peak regulation power of the steam pipe network comprises the following steps:
in the formula,. DELTA.PeMaximum ofAt maximum peak shaver power, Δ PeReleasingTo release the peak shaver power, t1The regulating time of the heat supply regulating valve is adjusted.
Example 3
An online quantitative calculation system for energy storage of a steam pipe network, as shown in fig. 2, includes:
the data acquisition module is used for acquiring real-time operation data of the steam pipe network, wherein the real-time operation data comprises the adjusting time of the heat supply adjusting valve, the real-time steam pressure and the steam quality of any pipe section;
and the online energy storage calculation module is interacted with the data acquisition module, and is used for calculating to obtain the total amount of steam used for peak shaving of the steam pipe network and the total amount of steam released in the regulation process of the steam pipe network based on the received real-time operation data of the steam pipe network, and further obtaining the maximum peak shaving power and the released peak shaving power of the steam pipe network.
Example 4
The contents are the same as those of example 3 except for the following.
The industrial steam cogeneration system further comprises: the system comprises a boiler 1, a steam turbine 2, a condenser 3, a condensate pump 4, a low-pressure heater 5, a deaerator 6, a water feeding pump 7, a high-pressure heater 8, a heat supply regulating valve 9 and a steam pipe network 10, which are shown in figure 1.
The boiler 1 is provided with a main steam outlet and a working medium inlet, the steam turbine 2 is provided with a working medium inlet and a plurality of extraction openings, the main steam outlet of the boiler 1 is communicated with the working medium inlet of the steam turbine 2, the steam turbine 2 is provided with a steam exhaust opening, the steam exhaust opening is communicated with the inlet of the condenser 3, the condensate pump 4, the low-pressure heater 5, the deaerator 6, the water feed pump 7 and the high-pressure heater 8 are sequentially connected, the outlet of the high-pressure heater 8 is communicated with the working medium inlet of the boiler 1, and the inlet of the low-pressure heater 5, the inlet of the deaerator 6 and the steam inlet of the high-pressure heater 8 are respectively connected with different steam extraction openings of the steam turbine 2;
the other heat supply steam extraction port of the steam turbine 2 is communicated with the inlet of a steam pipe network 10 through a pipeline, and a heat supply regulating valve 9 is arranged on the pipeline through which the steam turbine 2 is communicated with the steam pipe network 10;
the industrial steam cogeneration system changes the amount of steam entering the steam pipe network 10 by regulating the opening of the heat supply regulating valve 9, so that the steam pipe network 10 is used for storing energy and regulating the output power of the industrial steam cogeneration system.
When m isReleasing＝KmGeneral assemblyAnd K is less than or equal to 0.9, the opening degree of the heat supply regulating valve is increased until the steam pipe section i reaches the lowest allowable steam pressure, and K is a safety margin. The lowest allowable steam pressure of the steam pipe section is calculated from a section which is farthest from a heat supply steam extraction port of the steam turbine in a plurality of volume sections of the steam section based on a simulation method of a steam pipe network.
The steam quality of any pipe section is obtained by calculating the pressure, the temperature and the volume of the corresponding steam pipe section under the normal working condition.
The simulation of the steam pipe network is based on mass, energy and momentum conservation equations, and the actual process simulation is carried out on a steam pipe network simulation model established according to the actual structure and the operation data of the steam pipe network.
In summary, the invention provides an online quantitative calculation method for energy storage of a steam pipe network, which is used for online quantitative calculation of energy storage of the steam pipe network of an industrial steam cogeneration system, and calculates the total amount of steam which can be used for peak shaving of the steam pipe network and the total amount of steam released in the regulation process of the steam pipe network by collecting the real-time pressure of n sections of the steam pipe network, so as to obtain the maximum peak shaving power and the released peak shaving power of the steam pipe network. The method can obtain accurate calculation of the stored energy of the steam pipe network, and is used for assisting the peak shaving and frequency modulation of the unit so as to enable the unit to realize rapid variable load. The method has low investment and high unit flexibility.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. An online quantitative calculation method for energy storage of a steam pipe network is characterized in that a heat supply regulating valve is installed on the steam pipe network;
the online quantitative calculation method for the energy storage of the steam pipe network comprises the following steps:
step 1) acquiring real-time operation data of a steam pipe network, wherein the real-time operation data comprises real-time steam pressure and steam quality of any pipe section;
step 2) calculating the total amount of steam used for peak shaving of the steam pipe network based on real-time operation data of the steam pipe network;
calculating the total amount of steam released in the adjusting process of the steam pipe network based on the real-time operation data of the steam pipe network;
step 3) calculating to obtain the auxiliary peak shaving capacity of the steam pipe network based on the total amount of steam used for peak shaving of the steam pipe network and the total amount of steam released in the regulation process of the steam pipe network;
and 4) calculating to obtain the maximum peak regulating power and the release peak regulating power of the steam pipe network based on the auxiliary peak regulating capacity of the steam pipe network and in combination with the regulating time of the heat supply regulating valve.
2. The online quantitative calculation method for the energy storage of the steam pipe network according to claim 1, wherein the total amount of steam used for peak shaving in the steam pipe network in the step 1) is as follows:
in formula (1): m isGeneral assemblyIs the total amount of steam available for peak shaving, kg; piI, steam pressure of a steam pipe section, MPa; pi-minI is the lowest allowable steam pressure of the steam pipe section, MPa; m isiThe mass of steam in the ith steam pipe section is kg;
in the formula (2), mReleasingThe total amount of steam released in the process of regulating the steam pipe network is kg; pi1Adjusting the steam pressure of the steam pipe section i after the steam pressure is adjusted to be MPa;
in the step 3), the auxiliary peak regulation capacity of the steam pipe network comprises the maximum peak regulation capacity and the release peak regulation capacity of the steam pipe network;
ΔEmaximum of＝mGeneral assembly(h1-hn) (3)
ΔEReleasing＝mReleasing(h1-hn) (4)
In the formula: delta EMaximum ofFor maximum peak shaving capacity, Δ E, of steam pipe networkReleasingTo release the peak shaving ability, h1Supplying heat to the steam turbine (2) and extracting the steam enthalpy value of the steam port, kJ/kg; h isnIs the exhaust enthalpy value of the steam turbine (2), kJ/kg.
3. The online quantitative calculation method for the energy storage of the steam pipe network according to claim 2, wherein the specific calculation process of the step 4) is as follows:
in the formula,. DELTA.PeMaximum ofAt maximum peak shaver power, Δ PeReleasingTo release the peak shaver power, t1The regulating time of the heat supply regulating valve is adjusted.
4. The steam pipe network energy storage online quantitative calculation method according to claim 2, wherein when m isReleasing＝KmGeneral assemblyAnd when K is less than or equal to 0.9, K is a safety margin, and the opening degree of the heat supply regulating valve is increased until the steam pipe section i reaches the lowest allowable steam pressure.
5. The online quantitative calculation method for the energy storage of the steam pipe network according to claim 1, wherein the lowest allowable steam pressure of the steam pipe section is calculated from a section which is farthest from a heat supply steam extraction port of a steam turbine in a plurality of volume sections of the steam pipe section based on an analog simulation method for the steam pipe network;
the simulation of the steam pipe network is carried out based on a steam pipe network simulation model established by the actual structure and the operation data of the steam pipe network.
6. The online quantitative calculation method for steam pipe network energy storage according to claim 1, wherein the steam quality of any pipe section is calculated from the pressure, temperature and volume of the corresponding steam pipe section under normal working conditions.
7. An online quantitative calculation system for energy storage of a steam pipe network is characterized in that a heat supply regulating valve is installed on the steam pipe network;
the online quantitative calculation system of steam pipe network energy storage includes:
the data acquisition module is used for acquiring real-time operation data of the steam pipe network, wherein the real-time operation data comprises the adjusting time of the heat supply adjusting valve, the real-time steam pressure and the steam quality of any pipe section;
and the online energy storage calculation module is interacted with the data acquisition module, and is used for calculating to obtain the total amount of steam used for peak shaving of the steam pipe network and the total amount of steam released in the regulation process of the steam pipe network based on the received real-time operation data of the steam pipe network, and further obtaining the maximum peak shaving power and the released peak shaving power of the steam pipe network.
8. The online quantitative calculation system for steam pipe network energy storage according to claim 7, further comprising a control module, wherein the control module interacts with the online energy storage calculation module, and controls the opening of the heat supply regulating valve based on the relationship between the total amount of steam used for peak shaving by the steam pipe network and the total amount of steam released in the regulation process of the steam pipe network.
9. The online quantitative calculation system of steam pipe network energy storage according to claim 7, characterized in that the data acquisition module comprises a plurality of high-speed pressure sensors for measuring the real-time steam pressure of any pipe section;
the data acquisition module and the online energy storage calculation module are transmitted through a 5G network transmission line.
10. The steam pipe network energy storage online quantitative calculation system of claim 7, wherein the online energy storage calculation module comprises a plurality of PLC controllers which are integrally assembled.
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| CN113873463A (en) * | 2021-12-06 | 2021-12-31 | 常州艾肯智造科技有限公司 | Intelligent regulating valve pressure signal transmission system based on 5G communication |
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