CN109252909B - Gas internal combustion engine and steam turbine combined cycle power plant benchmark heat consumption evaluation method - Google Patents
Gas internal combustion engine and steam turbine combined cycle power plant benchmark heat consumption evaluation method Download PDFInfo
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 116
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- 238000010248 power generation Methods 0.000 claims abstract description 93
- 239000002918 waste heat Substances 0.000 claims abstract description 39
- 239000007789 gas Substances 0.000 claims abstract description 25
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- 239000003345 natural gas Substances 0.000 claims description 12
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- 239000003546 flue gas Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
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- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
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- F01K13/003—Arrangements for measuring or testing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
- F01N5/025—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat the device being thermoelectric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention relates to a method for evaluating the benchmark heat consumption of a gas internal combustion engine and steam turbine combined cycle power plant, which comprises the following steps: step 1) reading in monitoring data; step 2) carrying out a performance test; step 3) obtaining the order of a fitting polynomial of the comprehensive plant power consumption rate of the whole plant and the power generation power of the whole plant according to the actual operation data of the current N months every day, and fitting the order to be used as the reference comprehensive plant power consumption rate of the whole plant; step 4) calculating the reference heat consumption and the reference power generation efficiency of the internal combustion engine in real time every minute; step 5) determining the number of the units operating in a combined cycle mode according to the steam main pipe bypass signal and the waste heat boiler bypass signal; step 6) carrying out real-time weighted calculation on the generated power of the unit operated in a combined cycle mode and the generated power of the unit operated individually per minute to obtain the reference generating efficiency and the reference power supply heat consumption of the whole plant; and 7) automatically judging whether the actual power supply heat consumption of the power plant in the previous month is qualified. Compared with the prior art, the method has the advantages of ensuring accurate settlement of the electric charge and the like.
Description
Technical Field
The invention relates to the technical field of economic analysis of a gas internal combustion engine and steam turbine combined cycle power plant, in particular to a method for evaluating the reference heat consumption of the gas internal combustion engine and steam turbine combined cycle power plant.
Background
In recent years, more and more domestic enterprises begin to go out of the country, invest in the construction of overseas engineering projects, and overseas power supply projects are in a situation of increasing year by year. Among them, BOT (construction-operation-transfer) is a main investment mode, and in the BOT project, PPA (electricity purchase and sale protocol) defines the contents of the on-line electricity price mechanism, the unit performance requirement and the like, and is the core in the BOT project. In PPA, two on-line power rates are widely adopted in the international power market, and a calculation method of reference heat consumption is a key part in the two on-line power rates, so that investment income is directly influenced.
The gas internal combustion engine-steam turbine combined cycle power plant has the advantages of small occupied area, cleanness, high heat efficiency, capability of quickly connecting a grid and lifting loads, flexible operation and the like, is very suitable for a power grid system which needs flexible peak shaving due to load fluctuation, and has wide market internationally. However, due to the fact that the number of internal combustion engines is large, and the combined operation modes of the internal combustion engines and the steam turbines are large, how to reasonably calculate the reference heat consumption and evaluate the performance of the internal combustion engines and the steam turbines is a difficult problem.
The prior technical documents and patent searches show that:
< conventional thermal efficiency of gas-steam combined cycle > > (gas turbine technology, 9/1991, vol. 4, No. 3) mentions a technology for calculating the thermal efficiency of a gas turbine-steam turbine combined cycle, but on the one hand, it proposes a thermal efficiency calculation method only for the conventional gas turbine-steam turbine combined cycle, and has no complete technical solution for the benchmark thermal consumption characteristic of a gas internal combustion engine-steam turbine combined cycle power plant; on the other hand, the technology does not consider the energy loss related to the heat exchange of the cooling water of the internal combustion engine, the environmental heat dissipation, the steam used by an auxiliary system and the like in the system, and the reference heat consumption level of the power plant cannot be really reflected, such as the standard heat consumption level used in the PPA protocol, is unfavorable for the power plant and can cause the loss of investment income.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for evaluating the benchmark heat consumption of a gas internal combustion engine and steam turbine combined cycle power plant.
The purpose of the invention can be realized by the following technical scheme:
a gas internal combustion engine and steam turbine combined cycle power plant benchmark heat consumption evaluation method comprises the following steps:
step 1) establishing data interfaces with a power plant distributed control system and a power grid electric energy management system, and reading monitoring data;
step 2) performing performance tests, determining the order of a fitting polynomial of the steam turbine reference heat consumption and the steam turbine power generation power and fitting, and determining the average reference efficiency of the whole plant waste heat boiler by fitting and fitting the order of a combined cycle whole plant reference energy loss coefficient and the fitting polynomial of the whole plant power generation power;
step 3) obtaining the order of a fitting polynomial of the plant comprehensive plant power consumption rate and the plant power generation rate according to the actual operation data of the current N months every day, and fitting the order to be used as the reference plant comprehensive plant power consumption rate;
step 4) calculating the reference heat consumption and the reference power generation efficiency of the internal combustion engine in real time every minute according to the heat consumption fixed value of the internal combustion engine manufacturer and the actual running state of the unit;
step 5) determining the number of the units operating in a combined cycle mode according to the steam main pipe bypass signal and the waste heat boiler bypass signal;
step 6) operating the unit and the independently operating the unit in a combined cycle mode in real time every minute, and weighting the power generation power of the unit to calculate the reference power generation efficiency and the reference power supply heat consumption of the whole plant;
step 7) the power supply heat consumption of the whole plant is weighted and averaged according to the whole plant online power of every minute in the previous month to serve as the assessment heat consumption; and calculating the actual power supply heat consumption of the last month according to the actually generated natural gas consumption and the on-line electricity consumption, and automatically judging whether the actual power supply heat consumption of the last month of the power plant is qualified or not by a software system according to a set rule.
Preferably, the monitoring data in step 1) includes ambient pressure, ambient temperature, cooling water temperature, turbine power, power generated by each internal combustion engine, a turbine operating signal, an operating signal of each internal combustion engine, an operating signal of each waste heat boiler, a steam main pipe bypass signal, a waste heat boiler bypass signal, air temperature at an inlet of each internal combustion engine, power generated by the whole plant, power on line of the whole plant, natural steam consumption of the whole plant and power on line of the whole plant.
Preferably, N in step 3) is 3.
Preferably, the reference heat consumption of the steam turbine in the step 2) is calculated as follows:
in the formula:
Dmainis the main steam flow;
Hmainthe enthalpy value of the main steam is;
Dhfwis high pressure water supply flow;
Hhfwthe enthalpy value of the high-pressure feed water is obtained;
STGMWhthe hourly power generation of the steam turbine;
HR is the heat consumption of the steam turbine;
and calculating the heat consumption of the steam turbine under each performance test working condition as reference heat consumption according to the formula, and obtaining a fitting polynomial of the reference heat consumption of the steam turbine and the power generation power of the steam turbine, wherein the working condition is set according to the power generation power of each steam turbine.
Preferably, the reference energy loss coefficient of the combined cycle whole plant in the step 2) is specifically calculated as follows:
in the formula:
ηlossis the combined cycle energy loss coefficient;
ηrcombustion efficiency of the internal combustion engine;
ηMmechanical transmission efficiency of the internal combustion engine;
ηGis the efficiency of the gas-fired generator;
ηstgfor the efficiency of the steam turbine, where etastg＝3600/HR；
ηengine_EGBthe weighted average generating efficiency of all internal combustion engines operating in a combined cycle mode according to the generating power of the corresponding internal combustion engine;
ηavgegbthe weighted average value of the efficiency of all the waste heat boilers which operate in a combined cycle mode according to the power generation power of the corresponding internal combustion engine is obtained;
and calculating the energy loss coefficient under each performance test working condition according to the formula to be used as a reference energy loss coefficient, and obtaining a fitting polynomial of the reference energy loss coefficient of the combined cycle whole plant and the power generation power of the whole plant, wherein the working condition is set according to each grade of the power generation power of the whole plant.
Preferably, the power generation efficiency of the whole plant in the combined cycle mode
The calculation is as follows:
in the formula:
Mgasthe consumption of natural gas of the whole plant is calculated;
Qgasis the heat value of natural gas;
PlantMWhthe method is the hourly power generation of the whole plant in a combined cycle mode;
the power generation efficiency of the internal combustion engine is calculated as follows:
in the formula:
ηenginethe power generation efficiency of the internal combustion engine;
Mgas_engnatural gas consumption for internal combustion engines;
Pengineis the hourly power generation of the internal combustion engine;
calculating the power generation efficiency of each internal combustion engine according to the formula, and taking the weighted average value of the power generation power of the internal combustion engines as the average power generation efficiency eta of all the internal combustion engines operating in a combined cycle modeengine_B；
The efficiency of the waste heat boiler is calculated as follows:
in the formula:
ηegbthe waste heat boiler efficiency;
Tinthe inlet smoke temperature of the waste heat boiler;
Toutthe temperature of the outlet smoke of the waste heat boiler;
Tais ambient temperature;
calculating the efficiency of each waste heat boiler according to the formula, and obtaining the average efficiency eta of the whole plant waste heat boilers by adopting the weighted average of the power generation power of the corresponding internal combustion engineavgegb，
The average standard efficiency of the whole-plant waste heat boiler is the average value of the average efficiency of the whole-plant waste heat boiler under all the test working conditions.
Preferably, the power consumption of the plant comprehensive plant is specifically calculated as follows:
in the formula:
e is the comprehensive plant power consumption rate of the whole plant;
MWhplantthe daily generated energy of the whole plant;
MWh_Netplantthe daily network access electric quantity of the whole plant.
Preferably, the reference heat consumption and the reference power generation efficiency of the internal combustion engine in the step 4) are specifically calculated as follows:
reference heat consumption of internal combustion engine K1K 2
In the formula:
k1 is a load factor correction coefficient;
k2 is an aging correction coefficient;
the engine reference power generation efficiency is 3600/engine reference heat consumption.
Preferably, the reference power generation efficiency and the reference power supply heat consumption of the whole plant are specifically calculated as follows:
for units operating in a combined cycle mode, the combined cycle unit power generation efficiency can be calculated as:
in the formula:
ηlossis a combined cycle reference energy loss coefficient;
ηrcombustion efficiency of the internal combustion engine;
ηMmechanical transmission efficiency of the internal combustion engine;
ηGis the efficiency of the gas-fired generator;
ηstgfor the steam turbine reference efficiency, ηstg＝3600/HR；
ηengine_EGBA weighted average baseline power generation efficiency for all internal combustion engines operating in a combined cycle mode;
ηavgegbthe standard efficiency of the waste heat boiler is obtained;
for units operating in non-combined cycle mode, the power generation efficiency of the internal combustion engine operating in single machine mode
Can be calculated as:
in the formula:
ηengine_the weighted average reference power generation efficiency of all internal combustion engines operated in a non-combined cycle mode;
the standard generating efficiency of the whole plant is as follows:
MWh _ CC is the total power generation power of the combined cycle unit;
MWh _ EN is the total power generation power of the non-combined cycle unit;
and (3) power supply and heat consumption of the whole plant standard:
in the formula:
CHR _ Plant: the heat consumption of the whole plant is supplied with electricity on a reference basis;
and (2) avge: and the power consumption of the whole plant is synthesized on the basis of the whole plant.
Preferably, the method further comprises:
considering that the performance of the steam turbine and the waste heat boiler is aged along with the time, performance tests are periodically carried out, and the fitting polynomials in the step 2 are determined again according to the formulas (1) to (5).
Compared with the prior art, the invention considers the energy losses related to the heat exchange of the cooling water of the internal combustion engine, the environmental heat dissipation, the steam used by the auxiliary system and the like in the system, truly reflects the benchmark heat consumption level of the power plant, and ensures the effective execution of the power purchase and sale agreement of the power plant and the power grid and the accurate settlement of the electricity fee. Performance tests prove that the energy loss coefficient of the gas internal combustion engine-steam turbine combined cycle whole plant is about 0.015-0.025, as shown in figure 1, the energy loss coefficient accounts for 3% -5% of the power generation efficiency of the combined cycle whole plant, and if the energy loss coefficient is not considered, the reference heat consumption is reduced by 3% -5%. Taking a certain internal combustion engine-steam turbine combined cycle power plant as an example, the allowable deviation between the actual heat consumption and the reference heat consumption does not exceed 1.25%, after the invention is adopted, the deviation between the actual heat consumption and the reference heat consumption is reduced by 1.75-3.75%, the monthly loss is reduced by about 5.25-11.25 ten thousand ohms according to the average monthly fuel cost of 300 ten thousand ohms, the annual loss is reduced by about 63-135 ten thousand ohms, and the RMB is reduced by about 470-1010 ten thousand yuan. Therefore, the invention can ensure the accurate settlement of the electricity charge and avoid the great loss of the power plant.
Meanwhile, the real performance of the internal combustion engine-steam turbine combined cycle power plant can be obtained on line in real time, the heat consumption level and the change trend of the power plant can be mastered by the power plant operation and maintenance personnel in time, and on one hand, the operation personnel can regulate and control the optimized operation mode of a power plant unit in time and save the fuel cost; in addition, maintenance personnel can also adjust the maintenance plan of the equipment in time, eliminate the defects of the equipment and ensure that the equipment operates at high efficiency. Therefore, the technical scheme can effectively improve the economy and the safety of the power plant.
Drawings
FIG. 1 is a graph of energy loss coefficients;
FIG. 2 is a schematic diagram of an internal combustion engine-steam combined cycle power plant system in an embodiment.
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 some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of the present invention.
Through the search of the prior technical documents and patents, a complete technical scheme aiming at the reference heat consumption calculation and performance evaluation of the characteristics of the gas internal combustion engine-steam turbine combined cycle power plant is not found at present. The method provides a set of technical scheme capable of correctly and reasonably calculating the reference heat consumption of the gas internal combustion engine-steam turbine combined cycle power plant, and the scheme considers the energy losses related to the heat exchange of cooling water of the internal combustion engine, the environmental heat dissipation, the steam consumption of an auxiliary system and the like in the system, truly reflects the reference heat consumption level of the power plant, and ensures the effective execution of a power plant and power grid purchase and sale protocol and the accurate settlement of the electric charge.
The scheme is described in detail by taking an internal combustion engine-steam turbine combined cycle power plant as an example, and the power plant comprises 8 gas internal combustion engines and generators, and is matched with 8 waste heat boilers and 1 steam turbine and generator. As shown in fig. 2. The operation mode can be divided into:
1. the whole plant is operated in a combined cycle mode of an internal combustion engine and a steam turbine.
2. Part of the internal combustion engines run in a bypass mode, and corresponding waste heat boilers are stopped; the remaining internal combustion engines operate in a combined cycle.
3. All internal combustion engines run in a bypass mode, and corresponding waste heat boilers are stopped; and (5) stopping the steam turbine.
4. Part of internal combustion engines operate with the waste heat boiler, but the waste heat boiler outlet steam bypass mode operates. The remaining internal combustion engines operate in a bypass mode or a combined cycle.
The method comprises the following steps:
1) establishing data interfaces with a power plant distributed control system and a power grid electric energy management system, and reading in monitoring data; the monitoring data comprises environmental pressure, environmental temperature, cooling water temperature, power generation power of a steam turbine, power generation power of each internal combustion engine, operation signals of the steam turbine, operation signals of each internal combustion engine, operation signals of each waste heat boiler, a steam main pipe bypass signal, a waste heat boiler bypass signal, inlet air temperature of each internal combustion engine, power generation power of the whole plant, power on line of the whole plant, natural steam consumption of the whole plant and power on line of the whole plant.
2) And performing a performance test, determining and fitting the order of a fitting polynomial of the steam turbine reference heat consumption and the steam turbine power generation power, fitting and fitting the order of a combined cycle whole plant reference energy loss coefficient and the whole plant power generation power fitting polynomial, and determining the average reference efficiency of the whole plant waste heat boiler.
The method for calculating the heat consumption of the steam turbine comprises the following steps:
in the formula:
Dmain: a main steam flow rate;
Hmain: a main steam enthalpy value;
Dhfw: high pressure feed water flow;
Hhfw: enthalpy value of high-pressure feed water;
STGMWh: the hourly power generation of the steam turbine;
and calculating the heat consumption of the steam turbine under each performance test working condition (according to the power generation power of the steam turbine of each grade) as the reference heat consumption according to the formula, and obtaining a fitting polynomial of the reference heat consumption of the steam turbine and the power generation power of the steam turbine.
The method for calculating the energy loss coefficient of the combined cycle whole plant comprises the following steps:
in the formula:
ηloss: combined cycle energy loss systemThe number represents the energy loss related to the heat exchange of cooling water of the internal combustion engine, the environmental heat dissipation, the steam used by an auxiliary system and the like actually existing in the system;
ηr: the combustion efficiency of the internal combustion engine is designed according to the manufacturer of the internal combustion engine;
ηM: the mechanical transmission efficiency of the internal combustion engine is designed according to the manufacturer design data of the internal combustion engine;
ηG: the efficiency of the gas generator generally has little change, and is 0.98 or a performance test value;
ηstg: efficiency of steam turbine generation, ηstg3600/HR, HR is calculated as formula (1);
ηengine_EGB: the average power generation efficiency of all internal combustion engines operating in a combined cycle mode, see equation (4) below;
ηavgegb: the exhaust-heat boiler efficiency is shown in the following formula (5);
and calculating the energy loss coefficient under each performance test working condition (according to each grade of plant power generation power) as a reference energy loss coefficient according to the formula, and obtaining a fitting polynomial of the reference energy loss coefficient of the combined cycle plant and the plant power generation power.
The method for calculating the power generation efficiency of the whole plant in the combined cycle mode during the performance test comprises the following steps:
in the formula:
Mgas: consumption of natural gas of the whole plant;
Qgas: natural gas calorific value;
PlantMWh: the hourly power generation of the whole plant in a combined cycle mode;
the method for calculating the power generation efficiency of the internal combustion engine comprises the following steps:
in the formula:
ηengine: the power generation efficiency of the internal combustion engine;
Mgas_eng: natural gas consumption of internal combustion engines;
Pengine: the hourly power generation of the internal combustion engine;
the power generation efficiency of each internal combustion engine is calculated according to the above formula, and the average value is taken as the average power generation efficiency of all internal combustion engines operating in the combined cycle mode.
The method for calculating the efficiency of the waste heat boiler comprises the following steps:
in the formula:
ηegb: exhaust-heat boiler efficiency;
Tin: inlet flue gas temperature of the waste heat boiler;
Tout: the outlet smoke temperature of the waste heat boiler;
Ta: ambient temperature;
and calculating the efficiency of each waste heat boiler according to the formula, and weighting the generated power of the internal combustion engine to obtain the average efficiency of the waste heat boilers in the whole plant. The average standard efficiency of the whole-plant waste heat boiler is the average value of the whole-plant waste heat boiler efficiency under all the test working conditions.
3) And obtaining the order of a fitting polynomial of the comprehensive plant power consumption rate of the whole plant and the power generation rate of the whole plant according to the actual operation data of the whole plant every day in the last 3 months, and fitting to obtain the order as the reference comprehensive plant power consumption rate of the whole plant.
The method for calculating the power consumption of the comprehensive plant of the whole plant comprises the following steps:
in the formula:
e: the comprehensive plant power consumption rate of the whole plant;
MWhplant: generating capacity per day in the whole plant;
MWh_Netplant: the daily network access electric quantity of the whole plant;
4) and calculating the reference heat consumption and the reference power generation efficiency of the internal combustion engine every minute according to the heat consumption fixed value of the internal combustion engine manufacturer and the actual running state of the unit.
Reference heat consumption value K1K 2 (7) of internal combustion engine
In the formula:
k1: the load rate correction coefficient is calculated according to a correction curve provided by a manufacturer;
k2: the aging correction coefficient is calculated according to a correction curve provided by a manufacturer;
internal combustion engine standard generating efficiency 3600/internal combustion engine standard heat consumption (8)
5) And judging the number of the units operating in the combined cycle mode according to the bypass signal of the steam main pipe and the bypass signal of the waste heat boiler.
6) And (4) calculating the reference generating efficiency and the reference power supply heat consumption of the whole plant by weighting the generating power of the unit operated in a combined cycle mode and the generating power of the unit operated individually every minute.
For units operating in a combined cycle mode, the combined cycle unit power generation efficiency can be calculated as:
in the formula:
ηloss: calculating a combined cycle reference energy loss coefficient according to the fitting polynomial determined in the step 2;
ηr: the combustion efficiency of the internal combustion engine is designed according to the manufacturer of the internal combustion engine;
ηM: the mechanical transmission efficiency of the internal combustion engine is designed according to the manufacturer design data of the internal combustion engine;
ηG: the efficiency of the gas generator generally has little change, and is 0.98 or a performance test value;
ηstg: steam turbine reference power generation efficiency, ηstg3600/HR, HR is calculated as the fitted polynomial determined in step 2;
ηengine_EGB: calculating the weighted average reference generating efficiency of all internal combustion engines operating in a combined cycle mode according to the step 4;
ηavgegb: the reference efficiency of the waste heat boiler is determined according to the numerical value determined in the step 2;
for units operating in a non-combined cycle mode, the power generation efficiency of these single-engine operating internal combustion engines can be calculated as:
in the formula:
ηengine_bypass: calculating the reference power generation efficiency of the internal combustion engine according to the step 4, wherein the reference power generation efficiency is the weighted average reference power generation efficiency of all the internal combustion engines operated in the non-combined cycle mode;
the standard generating efficiency of the whole plant is as follows:
MWh _ CC: the total generated power of the combined cycle unit;
MWh _ EN: the total generated power of the non-combined cycle unit;
and (3) power supply and heat consumption of the whole plant standard:
in the formula:
CHR _ Plant: the heat consumption of the whole plant is supplied with electricity on a reference basis;
and (2) avge: calculating the power consumption of the whole plant standard comprehensive plant according to the fitting polynomial determined in the step 3;
7) at the beginning of each month and month, taking the whole-plant reference power supply heat consumption as the reference power supply heat consumption according to the whole-plant online power weighted average of every minute in the last month; calculating actual power supply consumption of the last month according to the actual natural gas consumption and the on-grid electricity consumption; and automatically judging whether the actual monthly power supply heat consumption of the power plant is qualified or not by the software system according to rules agreed with the power grid company.
8) Considering that the performance of the steam turbine and the waste heat boiler is aged along with the time, performance tests are periodically carried out, and the fitting polynomials in the step 2 are determined again according to the formulas (1) to (5).
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A gas internal combustion engine and steam turbine combined cycle power plant benchmark heat consumption evaluation method is characterized by comprising the following steps:
step 1) establishing data interfaces with a power plant distributed control system and a power grid electric energy management system, and reading in monitoring data;
step 2) performing performance tests, determining and fitting the order of a fitting polynomial of the steam turbine reference heat consumption and the steam turbine power generation power, and fitting the order of a combined cycle whole plant reference energy loss coefficient and the order of the fitting polynomial of the whole plant power generation power, and determining the average reference efficiency of the whole plant waste heat boiler;
step 3) obtaining the order of a fitting polynomial of the comprehensive plant power consumption rate of the whole plant and the power generation power of the whole plant according to the actual operation data of the current N months every day, and fitting the order to be used as the reference comprehensive plant power consumption rate of the whole plant;
step 4) calculating the reference heat consumption and the reference power generation efficiency of the internal combustion engine in real time every minute according to the heat consumption fixed value of the internal combustion engine manufacturer and the actual running state of the unit;
step 5) determining the number of the units operating in a combined cycle mode according to the steam main pipe bypass signal and the waste heat boiler bypass signal;
step 6) carrying out real-time weighted calculation on the generated power of the unit operated in a combined cycle mode and the generated power of the unit operated individually per minute to obtain the reference generating efficiency and the reference power supply heat consumption of the whole plant;
step 7) the power supply heat consumption of the whole plant is weighted and averaged according to the whole plant online power of every minute in the previous month to serve as the assessment heat consumption; calculating the actual power supply heat consumption of the last month according to the actually generated natural gas consumption and the on-line electricity consumption, and automatically judging whether the actual power supply heat consumption of the last month of the power plant is qualified or not by a software system according to a set rule;
the reference power generation efficiency and the reference power supply heat consumption of the whole plant are specifically calculated as follows:
for units operating in a combined cycle mode, the combined cycle unit power generation efficiency can be calculated as:
in the formula:
ηlossis a combined cycle reference energy loss coefficient;
ηrcombustion efficiency of the internal combustion engine;
ηMmechanical transmission efficiency of the internal combustion engine;
ηGis burnedEfficiency of the gas generator;
ηstgfor the steam turbine reference efficiency, ηstg＝3600/HR；
ηengine_EGBA weighted average baseline power generation efficiency for all internal combustion engines operating in a combined cycle mode;
ηavgegbthe standard efficiency of the waste heat boiler is obtained;
for units operating in non-combined cycle mode, the power generation efficiency of the internal combustion engine operating in single machine mode
Can be calculated as:
in the formula:
ηengine_bypassthe weighted average reference power generation efficiency of all internal combustion engines operated in a non-combined cycle mode;
the standard generating efficiency of the whole plant is as follows:
MWh _ CC is the total power generation power of the combined cycle unit;
MWh _ EN is the total power generation power of the non-combined cycle unit;
and (3) power supply and heat consumption of the whole plant standard:
in the formula:
CHR _ Plant: the heat consumption of the whole plant is supplied with electricity on a reference basis;
and (2) avge: and the power consumption of the whole plant is synthesized on the basis of the whole plant.
2. The method according to claim 1, wherein the monitoring data in step 1) comprises ambient pressure, ambient temperature, cooling water temperature, power generated by a steam turbine, power generated by each internal combustion engine, operating signals of the steam turbine, operating signals of each internal combustion engine, operating signals of each waste heat boiler, bypass signals of a steam main pipe, bypass signals of the waste heat boiler, inlet air temperature of each internal combustion engine, power generated by the whole plant, power on the internet of the whole plant, natural steam consumption of the whole plant and power on the internet of the whole plant.
3. The method of claim 1, wherein N in step 3) is 3.
4. The method according to claim 1, wherein the turbine reference heat rate in step 2) is calculated as follows:
in the formula:
Dmainis the main steam flow;
Hmainthe enthalpy value of the main steam is;
Dhfwis high pressure water supply flow;
Hhfwthe enthalpy value of the high-pressure feed water is obtained;
STGMWhthe hourly power generation of the steam turbine;
HR is the heat consumption of the steam turbine;
and calculating the heat consumption of the steam turbine under each performance test working condition as reference heat consumption according to the formula, and obtaining a fitting polynomial of the reference heat consumption of the steam turbine and the power generation power of the steam turbine, wherein the working condition is set according to the power generation power of each steam turbine.
5. The method according to claim 1, wherein the reference energy loss coefficient of the combined cycle plant in the step 2) is specifically calculated as follows:
in the formula:
ηlossis the combined cycle energy loss coefficient;
ηrcombustion efficiency of the internal combustion engine;
ηMmechanical transmission efficiency of the internal combustion engine;
ηGis the efficiency of the gas-fired generator;
ηstgfor the efficiency of the steam turbine, where etastg＝3600/HR；
ηengine_EGBthe weighted average generating efficiency of all internal combustion engines operating in a combined cycle mode according to the generating power of the corresponding internal combustion engine;
ηavgegbthe weighted average value of the efficiencies of all the waste heat boilers which operate in a combined cycle mode according to the power generation power of the corresponding internal combustion engine is obtained;
and calculating the energy loss coefficient under each performance test working condition according to the formula to be used as a reference energy loss coefficient, and obtaining a fitting polynomial of the reference energy loss coefficient of the combined cycle whole plant and the power generation power of the whole plant, wherein the working condition is set according to each grade of the power generation power of the whole plant.
6. The method of claim 5, wherein the combined cycle mode plant has a power generation efficiency
The calculation is as follows:
in the formula:
Mgasthe consumption of natural gas of the whole plant is calculated;
Qgasis the heat value of natural gas;
PlantMWhthe method is the hourly power generation of the whole plant in a combined cycle mode;
the power generation efficiency of the internal combustion engine is calculated as follows:
in the formula:
ηenginethe power generation efficiency of the internal combustion engine;
Mgas_engnatural gas consumption for internal combustion engines;
Pengineis the hourly power generation of the internal combustion engine;
calculating the power generation efficiency of each internal combustion engine according to the formula, and taking the weighted average value of the power generation power of the internal combustion engines as the average power generation efficiency eta of all the internal combustion engines operating in a combined cycle modeengine_EGB；
The efficiency of the waste heat boiler is calculated as follows:
in the formula:
ηegbthe waste heat boiler efficiency;
Tinthe inlet smoke temperature of the waste heat boiler;
Toutthe temperature of the outlet smoke of the waste heat boiler;
Tais ambient temperature;
calculating the efficiency of each waste heat boiler according to the formula, and obtaining the average efficiency of the waste heat boilers of the whole plant by adopting the weighted average of the generated power of the corresponding internal combustion engineRate etaavgegb，
The average reference efficiency of the whole-plant waste heat boiler is the average value of the average efficiency of the whole-plant waste heat boiler under all the test working conditions.
7. The method according to claim 1, wherein the plant wide integrated plant power usage is specifically calculated as follows:
in the formula:
e is the comprehensive plant power consumption rate of the whole plant;
MWhplantthe daily generated energy of the whole plant;
MWh_Netplantthe daily network access electric quantity of the whole plant.
8. The method according to claim 1, wherein the reference heat consumption and the reference power generation efficiency of the internal combustion engine in the step 4) are specifically calculated as follows:
reference heat consumption of internal combustion engine K1K 2
In the formula:
k1 is a load factor correction coefficient;
k2 is an aging correction coefficient;
the engine reference power generation efficiency is 3600/engine reference heat consumption.
9. The method of claim 1, further comprising:
considering that the performance of the steam turbine and the waste heat boiler is aged along with the time, performance tests are periodically carried out, and the fitting polynomials in the step 2 are determined again according to the formulas (1) to (5).
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