CN112766802A - Provincial heat supply unit peak regulation ability on-line monitoring system - Google Patents
Provincial heat supply unit peak regulation ability on-line monitoring system Download PDFInfo
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Abstract
The invention discloses an online monitoring system for peak regulation capacity of a provincial heat supply unit, which comprises a plurality of substation monitoring terminals and a main station monitoring terminal; the substation monitoring terminal comprises: the system comprises a DCS data acquisition module, a DCS looped network, a DCS system switch, a DCS system interface machine, a network isolation device, a system substation data acquisition server, a system substation local area network, a system substation database server, an SIS system switch, a system substation calculation application server and a system substation data distribution server; the main website monitor end includes: the system comprises a system main station data acquisition server, a VPN local area network, a system main station database server, a system main station calculation application server and an online monitoring system release platform. The method and the system can obtain the peak regulation capacity of the heat supply units of the whole province by monitoring the operation condition of the heat supply units of each power generation enterprise in real time and calculating the peak regulation capacity of each heat supply unit, thereby realizing the auxiliary decision of power grid dispatching.
Description
Technical Field
The invention relates to the technical field of estimation of peak shaving capacity of a heat supply unit, in particular to an online monitoring system for the peak shaving capacity of a provincial heat supply unit.
Background
In recent years, the large-scale development of renewable energy sources reaches 2019, the installed capacity of national power generation is 20.1 hundred million kilowatts, wherein the total installed capacity of clean energy sources such as hydropower, nuclear power, wind power, solar power generation and the like reaches 8.2 hundred million kilowatts and accounts for 40.8 percent of the total installed capacity. With the proposal of 'carbon peak reaching and carbon neutralization', the total consumption of renewable energy resources in China will continuously increase in the coming years. However, the randomness and the intermittence of wind power generation and photovoltaic power generation are strong, and the large-scale grid connection of the wind power generation and the photovoltaic power generation brings negative effects to the safe and stable operation of a power grid. Therefore, the operation flexibility of the thermal power generating unit is improved, and deep peak regulation is carried out.
With the continuous promotion of the laggard small thermoelectricity in the treatment and elimination of the scattered coal and the satisfaction of the good living demands of people, the large units gradually replace the small thermoelectricity to become the heat supply main force. The continuous development of deep peak regulation makes the heat supply unit participate in the deep peak regulation of the power grid in a large scale. However, the heat load and the electric load of the heat supply unit have a certain coupling effect, that is, the unit can meet the requirement of the heat supply amount only when the power required by the unit reaches a certain degree. Due to the thermoelectric coupling characteristic of the heat supply unit, the power grid dispatching can not accurately master the peak regulation capacity in real time, and certain influence is generated on the stability of the power grid.
In actual production, a power generation enterprise reports the relationship between the output of the unit and the heat supply load to a power grid for scheduling according to the daily operation experience of the heat supply unit or the fluctuation test of the power generation load of the unit under the working conditions of different heat supply loads, and the scheduling is adjusted according to the actual condition, so that the timeliness and the accuracy of the method have certain problems. The real-time online monitoring system can effectively solve the problem, but nowadays, the information security becomes more and more important, and how to effectively solve the problem of safe and stable data transmission between the internal and external networks of the enterprise and the enterprise is also a big problem.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides an on-line monitoring system for the peak regulation capacity of a provincial heat supply unit, so that the operation condition of the heat supply unit of each power generation enterprise can be monitored in real time, the peak regulation capacity of each heat supply unit can be calculated, the peak regulation capacity of the provincial heat supply unit is obtained, and real-time data support is provided for power grid scheduling.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to an on-line monitoring system for peak regulation capacity of a provincial heat supply unit.
The substation monitoring terminal comprises: the system comprises a DCS data acquisition module, a DCS looped network, a DCS system switch, a DCS system interface machine, a network isolation device, a system substation data acquisition server, a system substation local area network, a system substation database server, an SIS system switch, a system substation calculation application server and a system substation distribution server;
the main website monitor end includes: the system comprises a system main station data acquisition server, a VPN local area network, a system main station database server, a system main station calculation application server and an online monitoring system release platform;
the DCS data acquisition module acquires real-time operation data of each power generation enterprise heat supply unit through OPC communication and transmits the real-time operation data to a DCS system interface machine through a DCS ring network formed by a DCS system switch; the network isolation device transmits the real-time operation data to a system substation data acquisition server in a one-way mode by using a UDP protocol; the system substation data acquisition server transmits the real-time operation data to a system substation database server for data storage through a system substation local area network consisting of an SIS system switch; the system substation computing application server judges the start-stop and running states of the unit according to the unit grid-connected remote signaling value and the generator active power in the real-time running data, and judges the heat supply state of the unit according to the heat supply steam flow in the real-time running data; respectively calculating the upper limit and the lower limit of the operation load of the heat supply unit in the heat supply state by an equivalent enthalpy drop method, thereby obtaining a load adjustable interval of each heat supply unit; the system substation data distribution server distributes the processing data in the system substation computing application server to each power generation enterprise;
the system main station data acquisition server acquires processing data in the system substation computing application server through a VPN local area network and stores the processing data into a system main station database server; and the system master station calculation application server calculates the peak regulation capacity of the provincial heat supply unit according to the load adjustable interval of each power generation enterprise stored in the system master station database server and issues the peak regulation capacity through an online monitoring system issuing platform.
The provincial heat supply unit peak regulation capacity on-line monitoring system is also characterized in that: the real-time operation data comprises: the power generator active power, the main steam pressure, the main steam temperature, the main steam flow, the heat supply steam pressure, the heat supply steam temperature, the heat supply steam flow, the plant power consumption rate and the grid-connected remote signaling value of each heat supply unit.
The calculation of the load adjustable interval of each heat supply unit by the application server of the system substation is carried out according to the following steps:
step 1: calculating the equivalent enthalpy drop H of the new steam by using the formula (1)0：
In the formula (1), Q is the circulating heat of a steam turbine; HR (human HR)tThe heat rate of the steam turbine;
step 2: calculating the extraction equivalent enthalpy drop H of the heater j by using the formula (2)j：
In the formula (2), j is the code of the heater, and the heater codes are arranged from 1 according to the size of the steam inlet pressure; r is the code of the lower pressure steam extraction port behind the heater j; a. therRepresents that when the heater j is not in hydrophobic connection with the heater r, the value is taken as the enthalpy rise tau of the water siderWhen the heater j is in hydrophobic connection with the heater r, the value is hydrophobic heat release gammar；ηrThe steam extraction efficiency of the heater r; hrIs the equivalent enthalpy drop of the steam extraction of the heater r; q. q.srHeat released in the heater r for the steam; h isjIs the heating steam enthalpy of heater j; h is0The final exhaust enthalpy of the steam turbine; alpha is alphaj0 when heater j is before the reheater, followed by 1; sigma is the difference between the hot enthalpy and the cold enthalpy of the turbine;
and step 3: when the heat supply steam is led out from the section i, the heat supply steam is extracted from the section i
The proportional condensed water returns to the outlet of the heater k, and the equivalent enthalpy drop Delta H of the new steam caused by the steam extraction heat supply of the section i is calculated by the formula (3)i：
In formula (3): alpha is alphaiThe fraction of the heat supply steam of the section i is extracted;
the rate of return water of the heating steam is adopted; biThe return enthalpy of the heat supply steam of the i-section extracted steam is obtained; bkIs the effluent enthalpy of heater k; tau isrThe enthalpy of the water side of the heater r is increased; etak+1The extraction efficiency of heater k + 1; h isiIs the heating steam enthalpy of heater i;
and 4, step 4: when the heat supply unit has m steam extractions to supply heat, the output P of the heat supply unit is calculated by using the formula (4):
in formula (4): g0For the main steam flow of the turbine; h0The equivalent enthalpy drop of the new steam under the pure condensation working condition of the unit;
and 5: setting the main steam flow G of the steam turbine according to the formula (4)0Calculating the upper limit value A of the peak regulation capacity of the heat supply unit for the main steam flow of the heat supply unit under the working condition in summer;
setting the main steam flow G of the steam turbine according to the formula (4)0Calculating the lower limit value B of the peak shaving capacity of the heat unit according to the main steam flow under the deep peak shaving working condition;
and the upper limit value A and the lower limit value B form a load adjustable interval [ B, A ] of the heat supply unit.
The system main station calculation application server calculates the peak regulation capacity of the heat supply unit of the whole province according to the following steps:
calculating the total load adjustable interval [ M, N ] of the total-provincial heat supply unit by using the formula (5):
in formula (5): m is the adjustable lower limit of the load of the total-provincial heat supply unit, N is the adjustable upper limit of the load of the total-provincial heat supply unit, AcAdjustable lower limit for the c-th heat supply unit load, BicThe load of the C-th heat supply unit can be adjusted to the upper limit, and C is the number of the heat supply units in the whole province.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a provincial heat supply unit peak regulation capacity monitoring system, which is characterized in that operation parameters of each heat supply unit are collected and transmitted to a system substation monitoring end to calculate the peak regulation capacity of the heat supply unit in real time and issue the peak regulation capacity to each power generation enterprise client end, meanwhile, collected data and calculated data are transmitted to a system main station monitoring end to calculate the peak regulation capacity of the provincial heat supply unit and issue the peak regulation capacity on an online monitoring system platform, the system main station monitoring end regularly makes monthly, quarterly and annual reports of the provincial peak regulation capacity according to the monitored data, and important technical support is provided for overall provincial real-time load curve arrangement and generating capacity planning of power grid scheduling, so that power grid scheduling aid decision is realized.
2. According to the invention, data transmission of the internal network and the external network of the power generation enterprise is realized through the DCS system interface machine, the network isolation device and the preposed data acquisition server, the information security is greatly improved, and the data acquired from the DCS system is more accurate and real than the data acquired from the SIS system by the existing online monitoring system.
3. The invention realizes data transmission between each power generation enterprise and the monitoring department through the system substation server, the system main station server and the VPN local area network.
4. The system substation server and the system main station server can both store data, and when abnormal conditions occur, the system reconnection can be quickly found and realized, and the stability and accuracy of data transmission are effectively improved.
5. The method of the invention replaces the traditional heat supply unit operation experience formula by the equivalent enthalpy drop method or greatly improves the accuracy and the timeliness of the calculation of the peak regulation capacity of the heat supply unit by the fluctuation test of the unit generating load under the working conditions of different heat supply quantities.
Drawings
Fig. 1 is a schematic diagram of a peak regulation capacity monitoring system of a provincial heat supply unit.
Detailed Description
In this embodiment, as shown in fig. 1, a system for monitoring peak shaving capacity of a provincial heat supply unit includes a plurality of substation monitoring terminals and a main station monitoring terminal;
the substation monitoring terminal comprises: the system comprises a DCS data acquisition module, a DCS looped network, a DCS system switch, a DCS system interface machine, a network isolation device, a system substation data acquisition server, a system substation local area network, a system substation database server, an SIS system switch, a system substation calculation application server and a system substation distribution server;
the main website control end includes: the system comprises a system main station data acquisition server, a VPN local area network, a system main station database server, a system main station calculation application server and an online monitoring system release platform;
at system substation monitoring end, DCS data acquisition module obtains the real-time operating data of each power generation enterprise heat supply unit through OPC communication, includes: the power generator active power, the main steam pressure, the main steam temperature, the main steam flow, the heat supply steam pressure, the heat supply steam temperature, the heat supply steam flow, the plant power consumption rate and the grid-connected remote signaling value of each heat supply unit; and is transmitted to a DCS system interface machine through a DCS ring network consisting of DCS system switches; the network isolation device transmits real-time operation data to the system substation data acquisition server in a one-way mode by using a UDP protocol; the system substation data acquisition server transmits real-time operation data to a system substation database server for data storage through a system substation local area network consisting of an SIS system switch; the system substation computing application server judges the start-stop and running states of the unit according to the unit grid-connected remote signaling value and the generator active power in the real-time running data, and judges the heat supply state of the unit according to the heat supply steam flow in the real-time running data; respectively calculating the upper limit and the lower limit of the operation load of the heat supply unit in the heat supply state by an equivalent enthalpy drop method, thereby obtaining a load adjustable interval of each heat supply unit; the system substation data issuing server issues the processing data in the system substation computing application server to each power generation enterprise;
the system main station data acquisition server acquires processing data in the system substation computing application server through the VPN local area network and stores the processing data into the system main station database server; and the system master station computing application server computes the peak regulation capacity of the provincial heat supply unit according to the load adjustable interval of each power generation enterprise stored in the system master station database server and issues the peak regulation capacity through an online monitoring system issuing platform.
In this embodiment, the peak regulation capability monitoring system of the provincial heat supply unit can be divided into:
a data acquisition module: the intelligent monitoring system is used for collecting logic judgment of the operation state of each heating unit and real-time parameters of online monitoring calculation, and comprises a DCS data collecting module, a DCS looped network, a DCS system switch, a DCS system interface machine, a network isolating device and a system substation data collecting server;
a data storage module: the system is used for storing and collecting data in real time and comprises a system substation database server and a system main station database server. Deploying a database Server in a power generation enterprise SIS network, installing an SQL Server/Oracle database, storing and collecting real-time data, transmitting data of a substation monitoring end to a main station monitoring end through a VPN local area network, and realizing data storage in a system main station database Server;
a data calculation module: the system is used for logic judgment and data calculation and comprises a system substation calculation application server and a system main station calculation application server. The data calculation module judges the start-stop and running states of the unit according to the grid-connected remote signaling value of the unit and the active power of the generator, and judges the heat supply state of the unit according to the heat supply steam flow; and respectively calculating the upper limit and the lower limit of the running load of the heat supply unit in the heat supply state by an equivalent enthalpy drop method principle to obtain the load adjustable interval of each heat supply unit, and calculating the peak regulation capacity of the total-province heat supply unit.
The data release module: the system is used for data analysis and release and comprises a system substation release server and an online monitoring system release platform. And (3) publishing the unit collected data and the calculation analysis data in real time by using a WEB technology, and automatically generating a statistical report.
In this embodiment, the step of calculating, by the system substation, the load-adjustable interval of each heat supply unit by the calculation application server is as follows:
step 1: calculating the equivalent enthalpy drop H of the new steam by using the formula (1)0Namely, the equivalent enthalpy drop of the new steam is that 1kg of new steam actually works in the steam turbine, and the specific calculation formula is as follows:
in the formula (1), Q is the circulating heat of a steam turbine; HR (human HR)tThe heat rate of the steam turbine;
step 2: calculating the extraction equivalent enthalpy drop H of the heater j by using the formula (2)j：
In the formula (2), j is the code of the heater, and the heater codes are arranged from 1 according to the size of the steam inlet pressure; r is the code of the lower pressure steam extraction port behind the heater j; a. therRepresents that when the heater j is not in hydrophobic connection with the heater r, the value is taken as the enthalpy rise tau of the water siderWhen the heater j is in hydrophobic connection with the heater r, the value is hydrophobic heat release gammar；ηrThe steam extraction efficiency of the heater r; hrIs the equivalent enthalpy drop of the steam extraction of the heater r; q. q.srHeat released in the heater r for the steam; h isjIs the heating steam enthalpy of heater j; h is0The final exhaust enthalpy of the steam turbine; alpha is alphaj0 when heater j is before the reheater, followed by 1; sigma is the difference between the hot enthalpy and the cold enthalpy of the turbine;
and step 3: when the heat supply steam is led out from the section i, the heat supply steam is extracted from the section i
The proportional condensed water returns to the outlet of the heater k, and the equivalent enthalpy drop Delta H of the new steam caused by the steam extraction heat supply of the section i is calculated by the formula (3)i：
In formula (3): alpha is alphaiThe fraction of the heat supply steam of the section i is extracted;
to supply forHot steam backwater rate; biThe return enthalpy of the heat supply steam of the i-section extracted steam is obtained; bkIs the effluent enthalpy of heater k; tau isrThe enthalpy of the water side of the heater r is increased; etak+1The extraction efficiency of heater k + 1; h isiIs the heating steam enthalpy of heater i;
and 4, step 4: when the heat supply unit has m steam extractions to supply heat, the output P of the heat supply unit is calculated by using the formula (4):
in formula (4): g0For the main steam flow of the turbine; h0The equivalent enthalpy drop of the new steam under the pure condensation working condition of the unit;
and 5: and calculating the peak regulation capacity of each heat supply unit, and obtaining the generating power of different units by changing the main steam flow when the heat supply is stable, namely the steam supply flow is not changed greatly. Under the deep peak regulation environment, the load adjustment range of the heat supply unit is lambda-100% Pe (Pe is the rated load of the unit, and lambda is the lower limit value of the load of the heat supply unit participating in the deep peak regulation unit and is determined according to relevant policies of each province and government). The load adjustable interval of the unit under the corresponding heat supply load can be calculated by adjusting the upper and lower limit values of the load through the unit and corresponding to the main steam flow of the corresponding unit.
Peak regulation upper limit: and determining the maximum allowable steam inlet flow of the unit according to the load adjustment upper limit 100% Pe of the heat supply unit, namely the main steam flow of the unit under the summer working condition (TRL working condition), which is the maximum flow of the new steam of the heat supply unit. And according to a load calculation formula of the heat supply unit, calculating the maximum load of the unit under the corresponding heat supply working condition, namely the maximum limit value A of the peak regulation capacity of the heat supply unit.
Lower limit of peak regulation: under the condition of ensuring the minimum steam inlet flow of the low-pressure cylinder of the steam turbine and avoiding causing overtemperature problems after the industrial steam supply is extracted by the boiler, the minimum unit load corresponding to the heat supply working condition is calculated according to the main steam flow under the deep peak regulation load adjustment lower limit lambda Pe, and the minimum unit load is the lower limit value B of the peak regulation capacity of the heat supply unit.
Setting a turbine according to equation (4)Main steam flow G0Calculating the upper limit value A of the peak regulation capacity of the heat supply unit for the main steam flow of the heat supply unit under the working condition in summer;
setting the main steam flow G of the steam turbine according to the formula (4)0Calculating the lower limit value B of the peak shaving capacity of the heat unit according to the main steam flow under the deep peak shaving working condition;
the load adjustable interval [ B, A ] of the heat supply unit is formed by the upper limit value A and the lower limit value B.
In this embodiment, the calculation of the peak shaving capacity of the total-province heat supply unit by the system master station calculation application server includes the following steps:
calculating the total load adjustable interval [ M, N ] of the total-provincial heat supply unit by using the formula (5):
in formula (5): m is the adjustable lower limit of the load of the total-provincial heat supply unit, N is the adjustable upper limit of the load of the total-provincial heat supply unit, AcAdjustable lower limit for the c-th heat supply unit load, BicThe load of the C-th heat supply unit can be adjusted to the upper limit, and C is the number of the heat supply units in the whole province. The application example is as follows:
1. overview of the main equipment:
a certain heat supply unit steam turbine of a certain power plant is a supercritical, once intermediate reheating, three-cylinder four-steam-discharge, single-shaft and steam-extraction condensing steam turbine produced by a steam turbine plant of Shanghai electric power station equipment Limited company, and the model is as follows: c600-24.2/1.1/566/566.
TABLE 1 main design parameters of steam turbine
2. General heat supply:
the unit stably supplies heat to the heat source by exhausting and extracting steam from the unit, and the steam supply flow is 100 t/h.
3. Peak shaving capacity calculation:
respectively calculating the equivalent enthalpy drop of new steam of the heat supply unit, the equivalent enthalpy drop of the new steam caused by heat supply and the peak load regulation interval of the unit according to the calculation method of the peak regulation capacity monitoring system of the provincial heat supply unit, and measuring the maximum steam flow of the unit to obtain the main steam flow of the TRL working condition of the unit; the minimum flow is measured to obtain the main steam flow of the heat supply working condition corresponding to the working condition that the unit participates in the deep peak regulation lower limit of 40% Pe, and the calculation result is shown in the table 2.
TABLE 2 calculation results of peak regulation capacity of certain heat supply unit in certain power plant
| Name (R) | Unit of | Peak load condition | Peak regulation lower limit operating mode |
| Main steam flow | t/h | 1819 | 768 |
| Main steam enthalpy | kJ/kg | 3396 | 3513 |
| Enthalpy of heat re-generation | kJ/kg | 3596 | 3586 |
| Cold enthalpy of re-heat | kJ/kg | 2977 | 3025 |
| Enthalpy of feed water | kJ/kg | 1228 | 967 |
| Equivalent enthalpy drop of new steam | kJ/kg | 1187 | 1293 |
| Enthalpy of steam supply and extraction | kJ/kg | 3173 | 3181 |
| Flow rate of steam supply | t/h | 100 | 100 |
| The equivalent enthalpy drop of new steam caused by heat supply is reduced | kJ/kg | 39 | 93 |
| Peak load interval | MW | 580 | 256 |
4. And (4) conclusion:
the unit supplies steam 100t/h from the middle exhaust to the outside, and the peak regulation range of the unit is 256MW to 580 MW. And obtaining the peak regulation capacity curve of the unit according to the load curve and the heat supply curve of the unit. And finally, obtaining the peak regulation capacity of the total-province heat supply unit according to the peak regulation load interval of each heat supply unit.
Claims (4)
1. A peak regulation capability monitoring system of a provincial heat supply unit is characterized by comprising a plurality of substation monitoring terminals and a main station monitoring terminal;
the substation monitoring terminal comprises: the system comprises a DCS data acquisition module, a DCS looped network, a DCS system switch, a DCS system interface machine, a network isolation device, a system substation data acquisition server, a system substation local area network, a system substation database server, an SIS system switch, a system substation calculation application server and a system substation distribution server;
the main website monitor end includes: the system comprises a system main station data acquisition server, a VPN local area network, a system main station database server, a system main station calculation application server and an online monitoring system release platform;
the DCS data acquisition module acquires real-time operation data of each power generation enterprise heat supply unit through OPC communication and transmits the real-time operation data to a DCS system interface machine through a DCS ring network formed by a DCS system switch; the network isolation device transmits the real-time operation data to a system substation data acquisition server in a one-way mode by using a UDP protocol; the system substation data acquisition server transmits the real-time operation data to a system substation database server for data storage through a system substation local area network consisting of an SIS system switch; the system substation computing application server judges the start-stop and running states of the unit according to the unit grid-connected remote signaling value and the generator active power in the real-time running data, and judges the heat supply state of the unit according to the heat supply steam flow in the real-time running data; respectively calculating the upper limit and the lower limit of the operation load of the heat supply unit in the heat supply state by an equivalent enthalpy drop method, thereby obtaining a load adjustable interval of each heat supply unit; the system substation data distribution server distributes the processing data in the system substation computing application server to each power generation enterprise;
the system main station data acquisition server acquires processing data in the system substation computing application server through a VPN local area network and stores the processing data into a system main station database server; and the system master station calculation application server calculates the peak regulation capacity of the provincial heat supply unit according to the load adjustable interval of each power generation enterprise stored in the system master station database server and issues the peak regulation capacity through an online monitoring system issuing platform.
2. The system for monitoring peak shaving capacity of a provincial heating unit according to claim 1, wherein the real-time operation data comprises: the power generator active power, the main steam pressure, the main steam temperature, the main steam flow, the heat supply steam pressure, the heat supply steam temperature, the heat supply steam flow, the plant power consumption rate and the grid-connected remote signaling value of each heat supply unit.
3. The system for monitoring the peak shaving capacity of the provincial heat supply unit according to claim 1, wherein the system substation computing application server obtains the load adjustable interval of each heat supply unit through the following processes;
step 1: calculating the equivalent enthalpy drop H of the new steam by using the formula (1)0：
In the formula (1), Q is the circulating heat of a steam turbine; HR (human HR)tThe heat rate of the steam turbine;
step 2: calculating the extraction equivalent enthalpy drop H of the heater j by using the formula (2)j：
In the formula (2), j is the code of the heater, and the heater codes are arranged from 1 according to the size of the steam inlet pressure; r is the code of the lower pressure steam extraction port behind the heater j; a. therRepresents that when the heater j is not in hydrophobic connection with the heater r, the value is taken as the enthalpy rise tau of the water siderWhen the heater j is in hydrophobic connection with the heater r, the value is hydrophobic heat release gammar；ηrThe steam extraction efficiency of the heater r; hrIs the equivalent enthalpy drop of the steam extraction of the heater r; q. q.srHeat released in the heater r for the steam; h isjIs the heating steam enthalpy of heater j; h is0The final exhaust enthalpy of the steam turbine; alpha is alphaj0 when heater j is before the reheater, followed by 1; sigma is the difference between the hot enthalpy and the cold enthalpy of the turbine;
and step 3: when the heat supply steam is led out from the section i, the heat supply steam is extracted from the section i
The proportional condensed water returns to the outlet of the heater k, and the equivalent enthalpy drop Delta H of the new steam caused by the steam extraction heat supply of the section i is calculated by the formula (3)i：
In formula (3): alpha is alphaiThe fraction of the heat supply steam of the section i is extracted;
the rate of return water of the heating steam is adopted; biThe return enthalpy of the heat supply steam of the i-section extracted steam is obtained; bkIs the effluent enthalpy of heater k; tau isrThe enthalpy of the water side of the heater r is increased; etak+1The extraction efficiency of heater k + 1; h isiIs the heating steam enthalpy of heater i;
and 4, step 4: when the heat supply unit has m steam extractions to supply heat, the output P of the heat supply unit is calculated by using the formula (4):
in formula (4): g0For the main steam flow of the turbine; h0The equivalent enthalpy drop of the new steam under the pure condensation working condition of the unit;
and 5: setting the main steam flow G of the steam turbine according to the formula (4)0Calculating the upper limit value A of the peak regulation capacity of the heat supply unit for the main steam flow of the heat supply unit under the working condition in summer;
setting the main steam flow G of the steam turbine according to the formula (4)0Calculating the lower limit value B of the peak shaving capacity of the heat unit according to the main steam flow under the deep peak shaving working condition;
and the upper limit value A and the lower limit value B form a load adjustable interval [ B, A ] of the heat supply unit.
4. The system for monitoring the peak regulation capacity of the provincial heat supply unit according to claim 3, wherein the system master station computing application server computes the peak regulation capacity of the provincial heat supply unit according to the following process;
calculating the total load adjustable interval [ M, N ] of the total-provincial heat supply unit by using the formula (5):
in formula (5): m is the adjustable lower limit of the load of the total-provincial heat supply unit, N is the adjustable upper limit of the load of the total-provincial heat supply unit, AcAdjustable lower limit for the c-th heat supply unit load, BicThe load of the C-th heat supply unit can be adjusted to the upper limit, and C is the number of the heat supply units in the whole province.
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