CN113970446A - Method for determining thermal efficiency of marine gas turbine based on air intake and exhaust system - Google Patents
Method for determining thermal efficiency of marine gas turbine based on air intake and exhaust system Download PDFInfo
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- CN113970446A CN113970446A CN202111369253.2A CN202111369253A CN113970446A CN 113970446 A CN113970446 A CN 113970446A CN 202111369253 A CN202111369253 A CN 202111369253A CN 113970446 A CN113970446 A CN 113970446A
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- G01M15/14—Testing gas-turbine engines or jet-propulsion engines
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Abstract
The invention relates to a thermal efficiency determination method of a marine gas turbine based on an air intake and exhaust system. Which comprises the following steps: step 1, configuring a required running state of a marine gas turbine, and acquiring output power, fuel volume flow, power turbine rotating speed, current atmospheric pressure and current atmospheric temperature; step 2, determining the mass flow of the standard oil material in the current operation state; step 3, determining the characteristic power of the output shaft in the current running state; step 4, determining the reduced fuel mass flow and the reduced power according to the mass flow of the standard fuel, the output shaft characteristic power, the current atmospheric pressure and the current atmospheric temperature; and 5, determining the thermal efficiency in the current operation state according to the reduced fuel mass flow and the reduced power. The invention can effectively determine the thermal efficiency of the marine gas turbine based on the operation of the air inlet and outlet system.
Description
Technical Field
The invention relates to a thermal efficiency determination method, in particular to a thermal efficiency determination method of a marine gas turbine based on an air intake and exhaust system.
Background
The gas turbine is widely applied to industries such as locomotives, power generation, ships and the like as a high-speed rotating machine. The fixed type marine gas turbine is often applied to different types of ships, so that the air inlet system and the air outlet system are different; even if the same type of ship is used, the air inlet and exhaust systems of the gas turbine are different. The heat efficiency of the gas turbine for the ship is reduced by using fixed air inlet and exhaust resistance, so that the influence of an actual air inlet and exhaust system of the gas turbine on the heat efficiency cannot be represented, and the heat efficiency (oil consumption rate) of the actual work of the gas turbine cannot be represented.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a thermal efficiency determination method for a marine gas turbine based on an air intake and exhaust system, which can effectively determine the thermal efficiency of the marine gas turbine when the marine gas turbine operates only based on the air intake and exhaust system, and can assist in determining the operation of the marine gas turbine in different air intake and exhaust so as to ensure the economy.
According to the technical scheme provided by the invention, the thermal efficiency determining method during the operation of the marine gas turbine comprises the following steps:
step 1, configuring a required operation state of a marine gas turbine, and collecting output power N in the current operation stateeVolume flow Q of fuel oilfSpeed of the power turbine N3Current atmospheric pressure PIAnd the current atmospheric temperature t1；
Step 2, according to the volume flow Q of the fuel oilfDetermining the mass flow m of the standard oil material under the current operation stateb；
Step 3, according to the output power NeDetermining the characteristic power N of the output shaft in the current operation stateec；
Step 4, according to the mass flow m of the standard oil materialbCharacteristic power N of output shaftecCurrent atmospheric pressure PIAnd the current atmospheric temperature t1Determining the reduced fuel mass flow mzAnd a reduced power NezWherein
p0Is standard atmospheric pressure, t is the standard atmospheric temperature of the marine gas turbine;
step 5, according to the mass flow m of the converted fuel oilzAnd a reduced power NezDetermining the thermal efficiency eta at the current operating state, wherein,
and q is the lower heating value of the standard oil material.
In step 2, according to the volume flow Q of the fuel oilfDetermining the mass flow m of the standard oil material under the current operation statebWhen it is, then there are
Where ρ isf1Density in fuel oil test, tf1Temperature at fuel test, tfIs the fuel temperature at the time of the test, HuQ is the lower heat value of the standard oil material, and alpha is the correction coefficient of the fuel temperature to the density.
In step 3, according to the output power NeDetermining the characteristic power N of the output shaft in the current operating stateecWhen it is, then there are
Nec＝Ne×(1+ε1-ε2)
Wherein epsilon1、ε2All are correction coefficients of the dynamic vortex rotating speed to the power.
The invention has the advantages that: after the required operation state is configured for the marine gas turbine, the output power N under the current operation state is collectedeVolume flow Q of fuel oilfSpeed of the power turbine N3Current atmospheric pressure PIAnd the current atmospheric temperature t1Thereby passing throughWhen the thermal efficiency eta of the marine gas turbine based on the air intake and exhaust system can be obtained by eliminating other working parameters influencing the thermal efficiency, the influence of the current atmospheric temperature, the current atmospheric pressure and the output shaft characteristics on the efficiency of the marine gas turbine can be eliminated, and the thermal efficiency eta of the marine gas turbine based on the air intake and exhaust system can be obtained. After the thermal efficiency eta of the marine gas turbine based on the air inlet and exhaust system is effectively determined, the method has important significance for representing the thermal efficiency of the gas turbine under different air inlet and exhaust systems and evaluating and improving the air inlet and exhaust systems.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is further illustrated by the following specific figures and examples.
As shown in fig. 1: in order to effectively determine the thermal efficiency of the marine gas turbine based on the operation of an air inlet and exhaust system, the thermal efficiency determination method comprises the following steps:
step 1, configuring a required operation state of a marine gas turbine, and collecting output power N in the current operation stateeVolume flow Q of fuel oilfSpeed of the power turbine N3Current atmospheric pressure PIAnd the current atmospheric temperature t1；
Specifically, for a marine gas turbine, an air intake and exhaust system is disposed in the marine gas turbine, and the functions and specific working modes of the air intake and exhaust system in the marine gas turbine are consistent with those of the prior art, which are well known to those skilled in the art and will not be described herein again. The operating state required by the configuration of the marine gas turbine specifically means that the operating state of the marine gas turbine can be determined according to actual needs, such as rated operation and the like, and can be selected according to needs.
In order to obtain the thermal efficiency of the marine gas turbine based on the air intake and exhaust system after the marine gas turbine works in the required operation state, namely to determine the influence of the air intake and exhaust system on the thermal efficiency of the marine gas turbine, in the embodiment of the invention, the corresponding operation parameters of the marine gas turbine in the configuration operation state are collectedThe operation parameters collected in the configured working state need to be working parameters excluding other factors which can influence the thermal efficiency; in specific implementation, the working parameter includes output power NeVolume flow Q of fuel oilfSpeed of the power turbine N3Current atmospheric pressure PIAnd the current atmospheric temperature t1. Therefore, by excluding other operating parameters that may affect the thermal efficiency factor, the thermal efficiency of a gas turbine for a ship based on an intake and exhaust system can be calculated.
After the marine gas turbine is configured in a required operation state, the working parameters in the current operation state are collected by adopting the technical means commonly used in the technical field, namely the output power N in the current operation state is collectedeVolume flow Q of fuel oilfSpeed of the power turbine N3Current atmospheric pressure PIAnd the current atmospheric temperature t1. In specific implementation, the output power N can be obtained by a common power measurement modeeSaid output power NeThe measurement unit of (A) is Kw; the fuel volume flow Q can be measured by the conventional fuel volume flowmeterfSaid fuel volume flow rate QfMeasured in m3H; the rotating speed N of the power turbine can be measured by a rotating speed sensor of the gas turbine and the like3Said power turbine speed N3The measurement unit of (a) is r/m; the current atmospheric pressure P can be measured and obtained by a barometer and the likeISaid current atmospheric pressure PIThe measurement unit of (A) is Pa; the current atmospheric temperature t can be measured and obtained by measuring the internal thermal resistance and other temperature measuring modes of the gas turbine1Said front atmospheric temperature t1The unit of measurement of (a) is ℃.
Step 2, according to the volume flow Q of the fuel oilfDetermining the mass flow m of the standard oil material under the current operation stateb；
In particular, according to the fuel volumetric flow rate QfDetermining the mass flow m of the standard oil material under the current operation statebWhen it is, then there are
Where ρ isf1Density in fuel oil test, tf1Temperature at fuel test, tfIs the fuel temperature at the time of the test, HuThe fuel oil low heat value in the test is adopted, q is the low heat value of the standard fuel oil, and alpha is the correction coefficient of the fuel oil temperature to the density; density at fuel test rhof1Measured in kg/m3Temperature t at fuel testf1And the fuel temperature t at the time of the testfThe measurement units are all DEG C, and the low calorific value H of the fuel oil during the testuThe measurement unit is kj/kg, and the mass flow m of the standard oil materialbThe unit of measurement of (A) is kg/h.
Specifically, for a certain marine gas turbine, the correction coefficient α of the fuel oil temperature to the density can be determined by a table look-up method according to the characteristics of the marine gas turbine, and is specifically consistent with the prior art and well known to those skilled in the art, and will not be described herein again. In addition, for a certain marine gas turbine, the density ρ at the time of fuel test can be specifically determinedf1Temperature t during fuel oil testf1Fuel temperature t in the testfLow heat value H of fuel oil in testuThe low calorific value q of the standard oil, the correspondence between the specific corresponding parameters and the marine gas turbine, and the process of determining said parameters are well known to those skilled in the art and will not be described herein again.
Step 3, according to the output power NeDetermining the characteristic power N of the output shaft in the current operation stateec；
In particular, according to the output power NeDetermining the characteristic power N of the output shaft in the current operating stateecWhen it is, then there are
Nec＝Ne×(1+ε1-ε2)
Wherein epsilon1、ε2All are correction coefficients of the dynamic vortex rotating speed to the power. For a specific marine gas turbine, the rotational speed N of the motive vortex is used3Determining a correction factor epsilon of the obtained power according to the characteristic parameters of the marine gas turbine1、ε2As is well known in the art, the details are not repeated herein.
Step 4, according to the mass flow m of the standard oil materialbCharacteristic power N of output shaftecCurrent atmospheric pressure PIAnd the current atmospheric temperature t1Determining the reduced fuel mass flow mzAnd a reduced power NezWherein
p0Is standard atmospheric pressure, t is the standard atmospheric temperature of the marine gas turbine;
specifically, the standard atmospheric temperature t of the marine gas turbine is a design temperature of the marine gas turbine, and the standard atmospheric temperature t of the marine gas turbine is different when the operating parameters of the marine gas turbine are different, which is known to those skilled in the art and is not described herein again. In general, the standard atmospheric temperature t of a gas turbine for ships is 27 ℃.
Step 5, according to the mass flow m of the converted fuel oilzAnd a reduced power NezDetermining the thermal efficiency eta at the current operating state, wherein,
and q is the lower heating value of the standard oil material.
In specific implementation, after the marine gas turbine is configured with the required operation state, the output power N in the current operation state is acquiredeVolume flow Q of fuel oilfSpeed of the power turbine N3Current atmospheric pressure PIAnd the current atmospheric temperature t1Therefore, when the thermal efficiency eta of the marine gas turbine based on the air intake and exhaust system can be obtained by eliminating other working parameters influencing the thermal efficiency, the influence of the current atmospheric temperature, the current atmospheric pressure and the output shaft characteristics on the efficiency of the marine gas turbine can be eliminated, and the effect based on the air intake and exhaust system can be obtainedThe thermal efficiency η of the marine gas turbine below. In the embodiment of the invention, after the thermal efficiency eta of the marine gas turbine based on the air inlet and exhaust system is effectively determined, the method has important significance for representing the thermal efficiency of the gas turbine under different air inlet and exhaust systems and evaluating and improving the air inlet and exhaust systems.
Claims (3)
1. A thermal efficiency determination method for a marine gas turbine based on an air intake and exhaust system is characterized by comprising the following steps:
step 1, configuring a required operation state of a marine gas turbine, and collecting output power N in the current operation stateeVolume flow Q of fuel oilfSpeed of the power turbine N3Current atmospheric pressure PIAnd the current atmospheric temperature t1；
Step 2, according to the volume flow Q of the fuel oilfDetermining the mass flow m of the standard oil material under the current operation stateb；
Step 3, according to the output power NeDetermining the characteristic power N of the output shaft in the current operation stateec；
Step 4, according to the mass flow m of the standard oil materialbCharacteristic power N of output shaftecCurrent atmospheric pressure PIAnd the current atmospheric temperature t1Determining the reduced fuel mass flow mzAnd a reduced power NezWherein
p0Is standard atmospheric pressure, t is the standard atmospheric temperature of the marine gas turbine;
step 5, according to the mass flow m of the converted fuel oilzAnd a reduced power NezDetermining the thermal efficiency eta at the current operating state, wherein,
and q is the lower heating value of the standard oil material.
2. The method for determining the thermal efficiency of a gas turbine for a ship based on an intake and exhaust system as set forth in claim 1, wherein the step 2 is performed based on the volumetric flow rate Q of the fuel oilfDetermining the mass flow m of the standard oil material under the current operation statebWhen it is, then there are
Where ρ isf1Density in fuel oil test, tf1Temperature at fuel test, tfIs the fuel temperature at the time of the test, HuQ is the lower heat value of the standard oil material, and alpha is the correction coefficient of the fuel temperature to the density.
3. The method for determining the thermal efficiency of a gas turbine for a ship based on an intake and exhaust system as set forth in claim 1 or 2, wherein in the step 3, the output power N is determined according to the output powereDetermining the characteristic power N of the output shaft in the current operating stateecWhen it is, then there are
Nec＝Ne×(1+ε1-ε2)
Wherein epsilon1、ε2All are correction coefficients of the dynamic vortex rotating speed to the power.
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| CN106649945A (en) * | 2016-09-30 | 2017-05-10 | 赵志渊 | Calculation method for determining generated power and smoke discharge parameters of single-shaft gas turbine |
| CN113255248A (en) * | 2021-06-07 | 2021-08-13 | 上海明华电力科技有限公司 | Method for calculating fuel machine power of single-shaft combined cycle unit |
| CN113266468A (en) * | 2021-06-22 | 2021-08-17 | 合肥工业大学 | Hybrid electric propulsion method and device for three-shaft gas turbine engine |
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2021
- 2021-11-18 CN CN202111369253.2A patent/CN113970446A/en active Pending
Patent Citations (4)
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|---|---|---|---|---|
| CN102799161A (en) * | 2012-08-13 | 2012-11-28 | 浙江大学 | Performance index correcting and comparing method and regulation control system of combined cycle generating unit |
| CN106649945A (en) * | 2016-09-30 | 2017-05-10 | 赵志渊 | Calculation method for determining generated power and smoke discharge parameters of single-shaft gas turbine |
| CN113255248A (en) * | 2021-06-07 | 2021-08-13 | 上海明华电力科技有限公司 | Method for calculating fuel machine power of single-shaft combined cycle unit |
| CN113266468A (en) * | 2021-06-22 | 2021-08-17 | 合肥工业大学 | Hybrid electric propulsion method and device for three-shaft gas turbine engine |
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