CN113882956A - Online energy-saving monitoring system of gas-steam combined cycle unit - Google Patents
Online energy-saving monitoring system of gas-steam combined cycle unit Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
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Abstract
The invention discloses an online energy-saving monitoring system of a gas-steam combined cycle unit, which relates to the technical field of gas-steam combined cycle and comprises a hardware system and a software system; according to the method, through the establishment of a thermal efficiency and thermal consumption data model under the pure condensing working condition of the steam turbine, the relative efficiency, absolute efficiency and thermal consumption indexes under the pure condensing working condition of the steam turbine are calculated and monitored in real time, the indexes are compared with the indexes of a thermal equilibrium diagram of a manufacturer, and through the thermal efficiency and thermal consumption data model of the gas turbine, the method can be used for guiding the gas turbine to be washed, and when the efficiency is lower than 36.56% (the environmental temperature is 9.8 ℃), the gas turbine needs to be washed immediately; the performance indexes of the gas turbine can be monitored in real time, relevant personnel are guided to master the index reduction condition caused by the differential pressure rise of the air inlet filter screen, the through-flow loss, the efficiency of main parts, poor combustion and the like in time, the relevant personnel are guided to master the index reduction condition, the analysis and the adjustment are carried out in time, and the energy conservation and the consumption reduction are promoted.
Description
Technical Field
The invention relates to the technical field of gas-steam combined cycle, in particular to an online energy-saving monitoring system of a gas-steam combined cycle unit.
Background
The gas-steam combined cycle is a power generation technology with development prospect, which greatly improves the thermal efficiency of a thermal power plant, solves the pollution problem and promotes 'clean combustion of coal'. The Shanghai power generation equipment complete design research institute successively undertakes scientific and technological challenges such as 'low-calorific-value gas turbine key technology research', 'normal-pressure fluidized bed air pipe-buried heat transfer test research', 'second-generation pressurized fluidized bed combined cycle power generation key technology research' in a coal-fired gas-steam combined cycle project issued by the national ministry of sciences. On the basis of absorbing the foreign advanced technology, the key technology is successfully attacked, and scientific achievements are obtained. The coal clean combustion technology is a research field which is paid great attention to by all developed industrial countries at present, and the coal-fired gas-steam combined cycle is a power generation technology with the greatest development prospect because the thermal efficiency of a thermal power plant can be greatly improved and the pollution problem is solved.
The existing power plant has high energy consumption when generating electricity, and cannot monitor and calculate the heat efficiency and the heat consumption rate of a gas turbine, a steam turbine and a combined cycle in real time, so that related personnel cannot master the reduction condition of the heat efficiency and the heat consumption rate and cannot analyze the reduction condition, and corresponding measures are taken to enable a unit to be in a state with high energy consumption, so that the problem is solved by providing an online energy-saving monitoring system of the gas-steam combined cycle unit.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, when a power plant generates electricity, the energy consumption is high, and the heat efficiency and the heat consumption rate of a gas turbine, a steam turbine and a combined cycle cannot be monitored and calculated in real time, so that related personnel cannot master the situation that the heat efficiency and the heat consumption rate are reduced, further cannot analyze the situation, and adopt corresponding measures to enable a unit to be in a state with high energy consumption, and provides an online energy-saving monitoring system for a gas-steam combined cycle unit.
In order to achieve the purpose, the invention adopts the following technical scheme:
an online energy-saving monitoring system of a gas-steam combined cycle unit comprises a hardware system and a software system, wherein the software system is applied to the hardware system.
The hardware system comprises an SIS system and an energy efficiency monitoring system, real-time information of unit production acquired by an SIS system information data platform is read from the SIS system through configuration data forwarding service, the energy efficiency monitoring system externally releases a final calculation result of the system data platform, an index performance analysis database and a statistical query application server, the energy efficiency monitoring system can also divide each logic function, and hardware equipment can be shared and combined.
Preferably, the hardware system further comprises a real-time database server, a data switch, a long-distance platform, a Web server, a real-time/historical database, a monitoring calculator and a monitoring analyzer;
the monitoring analyzer collects the data of the unit, analyzes and processes the collected data, sends the collected and processed data to the data switch, the data switch sends the data to the monitoring calculator, the detection calculator calculates the data to obtain the monitoring data of the unit and sends the monitoring data to the data switch again, the data switch sends the data conversion format to the bench, the bench displays the data according to the converted data, the bench can read the data of the Web server and the real-time/historical database through the data switch, the real-time database server processes the data in the whole system and automatically stores the data, and the data switch sends the received data to the real-time/historical database, stored by the real-time/historical database.
Preferably, the software system comprises a data acquisition module, a data processing module, a real-time database, a gas turbine data modeling module, a combined cycle data modeling module and a steam turbine data modeling module;
the data acquisition module is used for acquiring field data, detecting the data and sending the acquired data to the data processing module;
the data processing module receives the data acquired by the data acquisition module, processes invalid data in the data, classifies the valid data, and then sends the data to the real-time database;
the real-time database stores the received data, updates the data in the database in time, and classifies and sends the data to the gas turbine data modeling module, the combined cycle data modeling module and the steam turbine data modeling module after the data is completed;
the gas turbine data modeling module carries out modeling on the gas turbine according to the received data and calculates the data through the model;
the combined cycle data modeling module carries out combined cycle modeling according to the received data and calculates the data through a model;
and the steam turbine data modeling module is used for modeling the steam turbine according to the received data and calculating the data through the model.
Preferably, the software system further comprises a data storage module, a monitoring and analyzing module, a central control module and a display module;
the data storage module stores data in the software system and provides real-time access permission for the software system;
the monitoring analysis module analyzes the data obtained by the software system and sends an analysis result to the central control module;
the central control module controls the whole software system, performs feedback analysis on the received data, and sends the analysis result to the display module for displaying.
Preferably, the software system further comprises a history database and a data comparison module;
the historical database is used for storing the operation data of the historical unit and sending the historical data of the unit to the data comparison module;
the data comparison module reads real-time operation data of the unit through the software system, reads data in the historical database, compares and analyzes the read real-time data and the historical data, and feeds back the data to the software system.
Preferably, the modeling of the gas turbine comprises establishing a gas turbine thermal efficiency and heat consumption data model, and the gas turbine thermal efficiency calculation formula is as follows:
the heat consumption rate calculation formula of the gas turbine is as follows:
Preferably, the modeling of the combined cycle comprises establishing a combined cycle thermal efficiency and heat consumption data model, and the calculation formula of the combined cycle thermal efficiency is as follows:
the combined cycle heat rate calculation formula is as follows:
Preferably, the modeling of the steam turbine includes establishing a data model of relative efficiency, absolute efficiency and heat rate under a pure condensing condition of the steam turbine, and a calculation formula of the relative internal efficiency of the steam turbine is as follows:
because the energy conversion of the steam in the steam turbine has loss, the ideal specific enthalpy drop of the steam cannot be completely changed into useful work, the useful work is only converted into the actual specific enthalpy drop, the combined cycle steam turbine has no regenerative steam extraction under the pure condensing working condition, simultaneously, the front end shaft seal steam leakage and the rear end shaft seal steam leakage and the door rod steam leakage are ignored, and the calculation formula of the relative internal efficiency is as follows:
The relative electric efficiency calculation formula of the steam turbine is as follows:
because of the mechanical loss and the electrical loss of the steam turbine generator unit, the power of the generator outgoing line is smaller than the actual enthalpy drop, etaelRepresents the ideal specific enthalpy drop of 1kg steam
How much energy is converted into electric energy in the formula:
preferably, the absolute internal efficiency calculation formula of the steam turbine is as follows:
in order to obtain the desired specific enthalpy drop of the steam during the entire cycle of the steam turbine plant
The heat quantity required to be added to the steam is far greater than
Much larger, mainly because of the large heat sink losses throughout the thermodynamic cycle,
the ratio of the heat added to the steam in the overall thermodynamic cycle is called the absolute electrical efficiency of the turbine, and the formula is:
Preferably, the absolute electric efficiency calculation formula of the steam turbine is as follows:
ideal specific enthalpy drop of steam
Part of the intermediate transfer into electric energy
ηelThe ratio of the heat added to the steam throughout the thermodynamic cycle is called the absolute electrical efficiency, and is given by the formula:
the heat consumption rate calculation formula of the steam turbine is as follows:
for the steam turbines with different parameters, the economy of the steam turbines can be evaluated by using heat consumption rate, the heat consumed by the production of electric energy is called the heat consumption rate and is expressed by q, and the formula is as follows:
compared with the prior art, the invention has the beneficial effects that:
1. the method establishes the thermal efficiency and heat consumption data model under the pure condensing condition of the steam turbine, realizes the real-time calculation and monitoring of the relative efficiency, absolute efficiency and heat consumption indexes under the pure condensing condition of the steam turbine, compares the indexes with the indexes of a thermal equilibrium diagram of a manufacturer, guides related personnel to master the condition of index reduction, analyzes and adjusts the indexes in time, and promotes energy conservation and consumption reduction.
2. The invention establishes a data model of the thermal efficiency and the heat consumption rate of the gas turbine, can be used for guiding the gas turbine to be washed, and needs to be immediately washed when the efficiency is lower than 36.56 percent (the environmental temperature is 9.8 ℃); the performance indexes of the gas turbine can be monitored in real time, relevant personnel are guided to timely master the condition of index reduction caused by the rise of differential pressure of an air inlet filter screen, through-flow loss, efficiency of main parts, poor combustion and the like, analysis and adjustment are timely carried out, and energy conservation and consumption reduction are promoted.
3. According to the invention, a combined cycle heat consumption rate and heat consumption rate data model is established, and the performance index difference of different operation modes of the unit is contrastively analyzed; performance indexes under different working conditions are calculated, and the significance is large; the method realizes real-time monitoring of the performance index of the combined cycle, compares the performance index with a thermal equilibrium diagram of a manufacturer, guides related personnel to master the condition of index reduction, analyzes and adjusts the performance index in time, and promotes energy conservation and consumption reduction.
4. In summary, the establishment and application of the data model of the heat efficiency and the heat consumption rate of the gas-steam combined cycle unit have great significance for promoting the energy conservation and consumption reduction of the power plant.
Drawings
FIG. 1 is a schematic diagram of a hardware system of an online energy-saving monitoring system of a gas-steam combined cycle unit provided by the invention;
fig. 2 is a software system schematic diagram of an online energy-saving monitoring system of a gas-steam combined cycle unit provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-2, an online energy-saving monitoring system for a gas-steam combined cycle unit comprises a hardware system and a software system, wherein the software system is applied to the hardware system.
The hardware system comprises an SIS system and an energy efficiency monitoring system, real-time information of unit production acquired by an SIS system information data platform is read from the SIS system through configuration data forwarding service, the energy efficiency monitoring system externally releases the final calculation results of the system data platform, an index performance analysis database and a statistical query application server, the energy efficiency monitoring system can also divide various logic functions, and hardware equipment can be shared and combined.
The hardware system also comprises a real-time database server, a data exchanger, a long-distance platform, a Web server, a real-time/historical database, a monitoring calculator and a monitoring analyzer;
the monitoring analyzer collects data of the unit, analyzes and processes the collected data, sends the collected and processed data to the data switch, the data switch sends the data to the monitoring calculator, the detection calculator calculates the data to obtain monitoring data of the unit and sends the monitoring data to the data switch again, the data switch sends a data conversion format to the value long platform, the value long platform displays the data according to the converted data, the value long platform can read data of the Web server and a real-time/historical database through the data switch, the real-time database server processes the data in the whole system and automatically stores the data, and the data switch sends the received data to the real-time/historical database and stores the data by the real-time/historical database.
The software system comprises a data acquisition module, a data processing module, a real-time database, a gas turbine data modeling module, a combined cycle data modeling module and a steam turbine data modeling module;
the data acquisition module is used for acquiring field data, detecting the data and sending the acquired data to the data processing module;
the data processing module receives the data acquired by the data acquisition module, processes invalid data in the data, classifies the valid data, and then sends the data to the real-time database;
the real-time database stores the received data, updates the data in the database in time, and classifies and sends the data to the gas turbine data modeling module, the combined cycle data modeling module and the steam turbine data modeling module after the data is completed;
the gas turbine data modeling module carries out modeling on the gas turbine according to the received data and calculates the data through the model;
the combined cycle data modeling module carries out combined cycle modeling according to the received data and calculates the data through a model;
and the steam turbine data modeling module is used for modeling the steam turbine according to the received data and calculating the data through the model.
The software system also comprises a data storage module, a monitoring analysis module, a central control module and a display module;
the data storage module stores data in the software system and provides real-time access permission for the software system;
the monitoring analysis module analyzes the data obtained by the software system and sends an analysis result to the central control module;
the central control module controls the whole software system, performs feedback analysis on the received data, and sends the analysis result to the display module for displaying.
The software system also comprises a historical database and a data comparison module;
the historical database is used for storing the operation data of the historical unit and sending the historical data of the unit to the data comparison module;
the data comparison module reads the real-time running data of the unit through the software system, reads the data in the historical database, compares and analyzes the read real-time data and the historical data, and feeds back the data to the software system.
The modeling of the gas turbine comprises the establishment of a gas turbine thermal efficiency and heat consumption data model, and the gas turbine thermal efficiency calculation formula is as follows:
the heat rate calculation formula of the gas turbine is as follows:
The modeling of the combined cycle comprises the establishment of a combined cycle thermal efficiency and heat consumption rate data model, and the calculation formula of the combined cycle thermal efficiency is as follows:
the combined cycle heat rate calculation formula is as follows:
The modeling of the steam turbine comprises the establishment of a relative efficiency, absolute efficiency and heat consumption rate data model under the pure condensing working condition of the steam turbine, and a calculation formula of the relative internal efficiency of the steam turbine is as follows:
because the energy conversion of the steam in the steam turbine has loss, the ideal specific enthalpy drop of the steam cannot be completely changed into useful work, the useful work is only converted into the actual specific enthalpy drop, the combined cycle steam turbine has no regenerative steam extraction under the pure condensing working condition, simultaneously, the front end shaft seal steam leakage and the rear end shaft seal steam leakage and the door rod steam leakage are ignored, and the calculation formula of the relative internal efficiency is as follows:
The relative electric efficiency calculation formula of the steam turbine is as follows:
because of the mechanical loss and the electrical loss of the steam turbine generator unit, the power of the generator outgoing line is smaller than the actual enthalpy drop, etaelRepresents the ideal specific enthalpy drop of 1kg steam
How much energy is converted into electric energy in the formula:
wherein, the absolute internal efficiency calculation formula of the steam turbine is as follows:
in order to obtain the desired specific enthalpy drop of the steam during the entire cycle of the steam turbine plant
The heat quantity required to be added to the steam is far greater than
Much larger, mainly because of the large heat sink losses throughout the thermodynamic cycle,
the ratio of the heat added to the steam in the overall thermodynamic cycle is called the absolute electrical efficiency of the turbine, and the formula is:
The absolute electric efficiency calculation formula of the steam turbine is as follows:
ideal specific enthalpy drop of steam
Part of the intermediate transfer into electric energy
ηelThe ratio of the heat added to the steam throughout the thermodynamic cycle is called the absolute electrical efficiency, and is given by the formula:
the heat consumption rate calculation formula of the steam turbine is as follows:
for the steam turbines with different parameters, the economy of the steam turbines can be evaluated by using heat consumption rate, the heat consumed by the production of electric energy is called the heat consumption rate and is expressed by q, and the formula is as follows:
example 1: for directing the gas turbine to wash with water;
the thermal efficiency and the heat consumption rate before and after the water washing of the gas turbine are calculated by using a gas turbine data model, the efficiency after the water washing of the gas turbine is improved by 1.8%, the power is improved by 0.54MW, the heat consumption rate is reduced by 462.14KJ/kwh, and the water washing effect is obvious, so that the mathematical model can be used for guiding the water washing of the gas turbine, and for an ALSTOM GT13E2 type gas turbine, the water washing needs to be considered when the efficiency is lower than 38.36% (the environmental temperature is 9.8 ℃), and the water washing needs to be immediately carried out when the efficiency is lower than 36.56% (the environmental temperature is 9.8 ℃).
Example 2: the system is used for monitoring the performance index of the gas turbine in real time;
the heat efficiency and heat consumption index of the gas turbine can be calculated and monitored in real time by utilizing the data model of the gas turbine, and comparing with the design index to guide the relevant personnel to grasp the condition of index reduction caused by the differential pressure rise of the air inlet filter screen, the through-flow loss, the efficiency reduction of main parts, poor combustion and the like in time, timely analyzing and adjusting, calculating the thermal efficiency and the heat consumption rate of the gas turbine at the ambient temperature of 15 ℃ by using a gas turbine mathematical model, wherein the thermal efficiency and the heat consumption rate are lower than the design efficiency (ISO working condition) 37.05% and the design heat consumption rate (9716.6kJ/kWh), judging the reason that the efficiency of main parts is reduced along with the increase of the gas turbine in operation hours, carrying out detailed inspection and analysis when the gas turbine is overhauled, calculating the thermal efficiency of the ALSTOM GT13E2 gas turbine under different working conditions by using a data model, the method enables a person to master the thermal efficiency index of the ALSTOM GT13E2 type combustion engine under different working conditions.
Example 3: the method is used for comparing performance indexes of gas turbines of the same model;
under the same atmospheric conditions, the comparison of the data of the mathematical model shows that: under the same atmospheric condition, the base load of the first combustion engine is about 7WM higher than that of the second combustion engine, the second combustion engine enters the temperature control mode earlier, the efficiency of the first combustion engine is 0.9% higher than that of the second combustion engine at the base load, and the heat consumption rate is low at 329.93kJ/kg, so that the performance of the first combustion engine is obviously better than that of the second combustion engine, and the combustion adjustment is carried out after the first combustion engine is overhauled due to poor combustion of the first combustion engine.
Example 4: the system is used for comparing and analyzing the performance index difference of the unit in different operation modes;
the thermal efficiency and heat consumption rate indexes of two different operation modes of the Tungxiang combustion engines 221 and 111 can be analyzed by utilizing a combined cycle thermal efficiency and heat consumption rate data model, and which operation mode is more economical is determined;
221 operating mode: the first gas turbine and the first waste heat boiler operate, and steam generated by the first waste heat boiler drives the second steam turbine to operate through the switching main pipe; 111 operating mode: the second gas turbine and the second waste heat boiler operate, and steam generated by the second waste heat boiler drives the second steam turbine to operate; the thermal efficiency and the heat consumption index of the current unit 221 mode and 111 mode are calculated by using the combined cycle data model, and the calculation result shows that the operation mode index of the Tungxiang combustion engine 221 is superior to that of the 111 operation mode, and the main reason is that the performance of the first combustion engine is obviously superior to that of the second combustion engine. Thus, the current 221 mode of operation is more economical.
Example 5: the method is used for calculating the combined cycle performance index under different working conditions;
and calculating the combined cycle indexes of the combustion engine under different working conditions by using a combined cycle data model according to the thermal equilibrium diagram data, wherein the calculation result has important significance for mastering the performance indexes of the unit under different working conditions.
Example 6: the method is used for monitoring the performance index of the combined cycle in real time;
the combined cycle data model can be used for calculating and monitoring the indexes of the heat efficiency and the heat consumption rate of the combined cycle in real time, and comparing the indexes with the indexes of a thermal equilibrium diagram of a manufacturer to guide relevant personnel to master the condition of index reduction in time and analyze and adjust the indexes in time, so that energy conservation and consumption reduction are promoted.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. An online energy-saving monitoring system of a gas-steam combined cycle unit comprises a hardware system and a software system, and is characterized in that the software system is applied to the hardware system.
The hardware system comprises an SIS system and an energy efficiency monitoring system, real-time information of unit production acquired by an SIS system information data platform is read from the SIS system through configuration data forwarding service, the energy efficiency monitoring system externally releases a final calculation result of the system data platform, an index performance analysis database and a statistical query application server, the energy efficiency monitoring system can also divide each logic function, and hardware equipment can be shared and combined.
2. The on-line energy-saving monitoring system of the gas-steam combined cycle unit as claimed in claim 1, wherein the hardware system further comprises a real-time database server, a data exchanger, a long-distance platform, a Web server, a real-time/historical database, a monitoring calculator and a monitoring analyzer;
the monitoring analyzer collects the data of the unit, analyzes and processes the collected data, sends the collected and processed data to the data switch, the data switch sends the data to the monitoring calculator, the detection calculator calculates the data to obtain the monitoring data of the unit and sends the monitoring data to the data switch again, the data switch sends the data conversion format to the bench, the bench displays the data according to the converted data, the bench can read the data of the Web server and the real-time/historical database through the data switch, the real-time database server processes the data in the whole system and automatically stores the data, and the data switch sends the received data to the real-time/historical database, stored by the real-time/historical database.
3. The gas-steam combined cycle unit online energy-saving monitoring system according to claim 1, wherein the software system comprises a data acquisition module, a data processing module, a real-time database, a gas turbine data modeling module, a combined cycle data modeling module and a steam turbine data modeling module;
the data acquisition module is used for acquiring field data, detecting the data and sending the acquired data to the data processing module;
the data processing module receives the data acquired by the data acquisition module, processes invalid data in the data, classifies the valid data, and then sends the data to the real-time database;
the real-time database stores the received data, updates the data in the database in time, and classifies and sends the data to the gas turbine data modeling module, the combined cycle data modeling module and the steam turbine data modeling module after the data is completed;
the gas turbine data modeling module carries out modeling on the gas turbine according to the received data and calculates the data through the model;
the combined cycle data modeling module carries out combined cycle modeling according to the received data and calculates the data through a model;
and the steam turbine data modeling module is used for modeling the steam turbine according to the received data and calculating the data through the model.
4. The online energy-saving monitoring system of the gas-steam combined cycle unit as claimed in claim 1, wherein the software system further comprises a data storage module, a monitoring and analyzing module, a central control module and a display module;
the data storage module stores data in the software system and provides real-time access permission for the software system;
the monitoring analysis module analyzes the data obtained by the software system and sends an analysis result to the central control module;
the central control module controls the whole software system, performs feedback analysis on the received data, and sends the analysis result to the display module for displaying.
5. The gas-steam combined cycle unit online energy-saving monitoring system according to claim 1, wherein the software system further comprises a historical database and a data comparison module;
the historical database is used for storing the operation data of the historical unit and sending the historical data of the unit to the data comparison module;
the data comparison module reads real-time operation data of the unit through the software system, reads data in the historical database, compares and analyzes the read real-time data and the historical data, and feeds back the data to the software system.
6. The gas-steam combined cycle unit online energy-saving monitoring system according to claim 3, wherein the modeling of the gas turbine comprises establishing a gas turbine thermal efficiency and heat rate data model, and the gas turbine thermal efficiency calculation formula is as follows:
the heat consumption rate calculation formula of the gas turbine is as follows:
7. The system for monitoring the on-line energy conservation of the gas-steam combined cycle unit as claimed in claim 3, wherein the modeling of the combined cycle comprises establishing a combined cycle thermal efficiency and heat rate data model, and the combined cycle thermal efficiency is calculated by the following formula:
the combined cycle heat rate calculation formula is as follows:
8. The system for monitoring the online energy conservation of the gas-steam combined cycle unit according to claim 3, wherein the modeling of the steam turbine comprises establishing data models of relative efficiency, absolute efficiency and heat rate under the pure condensing condition of the steam turbine, and the calculation formula of the relative internal efficiency of the steam turbine is as follows:
because the energy conversion of the steam in the steam turbine has loss, the ideal specific enthalpy drop of the steam cannot be completely changed into useful work, the useful work is only converted into the actual specific enthalpy drop, the combined cycle steam turbine has no regenerative steam extraction under the pure condensing working condition, simultaneously, the front end shaft seal steam leakage and the rear end shaft seal steam leakage and the door rod steam leakage are ignored, and the calculation formula of the relative internal efficiency is as follows:
The relative electric efficiency calculation formula of the steam turbine is as follows:
because of the mechanical loss and the electrical loss of the steam turbine generator unit, the power of the generator outgoing line is smaller than the actual enthalpy drop, etaelRepresents the ideal specific enthalpy drop of 1kg steam
How much energy is converted into electric energy in the formula:
9. The system for monitoring the on-line energy conservation of the gas-steam combined cycle unit according to claim 8, wherein the absolute internal efficiency calculation formula of the steam turbine is as follows:
in order to obtain the desired specific enthalpy drop of the steam during the entire cycle of the steam turbine plant
The heat quantity required to be added to the steam is far greater than
Much larger, mainly because of the large heat sink losses throughout the thermodynamic cycle,
the ratio of the heat added to the steam in the overall thermodynamic cycle is called the absolute electrical efficiency of the turbine, and the formula is:
10. The system for monitoring the on-line energy conservation of the gas-steam combined cycle unit according to claim 8, wherein the absolute electric efficiency calculation formula of the steam turbine is as follows:
ideal specific enthalpy drop of steam
Part of the intermediate transfer into electric energy
The ratio of the heat added to the steam throughout the thermodynamic cycle is called the absolute electrical efficiency, and is given by the formula:
the heat consumption rate calculation formula of the steam turbine is as follows:
for the steam turbines with different parameters, the economy of the steam turbines can be evaluated by using heat consumption rate, the heat consumed by the production of electric energy is called the heat consumption rate and is expressed by q, and the formula is as follows:
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