CN113282872A - Method for calculating thermal efficiency of boiler of coal-fired thermal power generating unit in real time and related device - Google Patents
Method for calculating thermal efficiency of boiler of coal-fired thermal power generating unit in real time and related device Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004364 calculation method Methods 0.000 claims abstract description 80
- 239000000446 fuel Substances 0.000 claims abstract description 76
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000002485 combustion reaction Methods 0.000 claims description 19
- 238000000889 atomisation Methods 0.000 claims description 13
- 239000002893 slag Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000779 smoke Substances 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 239000000295 fuel oil Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 14
- 239000002956 ash Substances 0.000 description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 9
- 239000003546 flue gas Substances 0.000 description 8
- 239000010881 fly ash Substances 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000003009 desulfurizing effect Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
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- 238000002076 thermal analysis method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
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- 239000003921 oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
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- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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Abstract
The application discloses a method for calculating the thermal efficiency of a boiler of a coal-fired thermal power generating unit in real time and a related device, wherein the method comprises the following steps: acquiring real-time boiler related data of a boiler of a thermal power generating unit; respectively calculating the total external heat, the total fuel low-level heating value and the total boiler loss heat of the boiler of the thermal power generating unit according to the real-time related data; summing calculation is carried out according to the total external heat and the total fuel low-order heating value to obtain the total heat input into the system boundary; the boiler thermal efficiency is calculated from the total heat input to the system boundary and the total boiler lost heat. The method and the device can solve the technical problems that the calculation result of the existing boiler thermal efficiency calculation method is low in precision and poor in stability.
Description
Technical Field
The application relates to the technical field of thermal power generation, in particular to a method for calculating the thermal efficiency of a boiler of a coal-fired thermal power generating unit in real time and a related device.
Background
The boiler thermal efficiency is an important technical and economic index reflecting the boiler operation economy, and the boiler thermal efficiency needs to be accurately calculated under the conditions of boiler operation mode evaluation, boiler performance identification, combustion condition adjustment and the like.
The boiler thermal efficiency is a main technical index for representing the operating economy of the boiler, a corresponding boiler thermal efficiency calculation rule is provided during boiler performance assessment, but when the boiler thermal efficiency is calculated on line, measuring point parameters required in the calculation test rule are often lacked, so that inconvenience is brought to on-line calculation. After summary analysis, if the on-line calculation of the boiler thermal efficiency lacks some calculation parameters in the test procedures, the calculation methods which can be adopted are as follows: a simplified calculation method based on a test procedure and a calculation method based on an approximate formula.
Although the prior art already has the calculation mode of the boiler thermal efficiency, the prior art still has some obvious problems, such as low calculation result precision, poor stability and the like.
Disclosure of Invention
The application provides a method and a related device for calculating the thermal efficiency of a boiler of a coal-fired thermal power generating unit in real time, which are used for solving the technical problems of low accuracy of a calculation result and poor stability of the existing boiler thermal efficiency calculation method.
In view of this, the first aspect of the present application provides a method for calculating thermal efficiency of a boiler of a coal-fired thermal power generating unit in real time, including:
acquiring real-time boiler related data of a boiler of a thermal power generating unit;
respectively calculating the total external heat, the total fuel low-level heating value and the total boiler loss heat of the boiler of the thermal power generating unit according to the real-time related data;
summing and calculating according to the total external heat and the total fuel low-order heating value to obtain the total heat input to the system boundary;
and calculating the boiler thermal efficiency according to the total heat input to the system boundary and the total boiler loss heat.
Optionally, the total external heat includes: physical sensible heat of fuel, physical sensible heat of a desulfurizer, dry air heat of a system boundary, water vapor heat of a system, auxiliary equipment heat and fuel atomization steam heat;
the expression of the total external heat is:
Qex＝Qf+Qdes+Qa.d+Qwv+Qaux+Qst.at
wherein Q isfBeing physically sensible heat of the fuel, QdesIs the physical sensible heat of a desulfurizer, Qa.dFor system boundary dry air heat, QwvAs heat of the system steam, QauxFor auxiliary plant heat, Qst.atIs the fuel oil atomization steam heat.
Optionally, the calculation formula of the total fuel low heating value is as follows:
wherein q ism.f.iIs the consumption of the i-th fuel component, Qnet.ar.iIs the lower calorific value, omega, of the ith fuelf.iIs the mass fraction of the ith fuel consumption to the total fuel consumption.
Optionally, the calculating the boiler thermal efficiency according to the total heat input to the system boundary and the total boiler loss heat comprises:
calculating the boiler thermal efficiency according to the total heat of the input system boundary and the total boiler loss heat by adopting a boiler thermal efficiency calculation formula, wherein the boiler thermal efficiency calculation formula is as follows:
wherein Q isinIs the total heat of the boundary of the input system, QlossFor the total boiler heat loss:
Qloss＝Q2+Q3+Q4+Q5+Q6+Qoth
wherein Q is2、Q3、Q4、Q5、Q6、QothThe heat loss amount of the exhaust smoke, the heat loss amount of the incomplete combustion of the gas, the heat loss amount of the combustible, the heat loss amount of the incomplete combustion of the solid of the oil-fired boiler, the physical heat loss amount of the ash slag and other heat loss amounts are respectively.
The application second aspect provides a coal-fired thermal power generating unit boiler thermal efficiency real-time computation device, includes:
the acquisition module is used for acquiring real-time boiler related data of the thermal power generating unit boiler;
the first calculation module is used for calculating total external heat, total fuel low-level heating value and total boiler loss heat of the boiler of the thermal power generating unit according to the real-time related data;
the summing module is used for carrying out summing calculation according to the total external heat and the total fuel low-order heating value to obtain the total heat input to the system boundary;
and the second calculation module is used for calculating the thermal efficiency of the boiler according to the total heat of the input system boundary and the total boiler loss heat.
Optionally, the total external heat includes: physical sensible heat of fuel, physical sensible heat of a desulfurizer, dry air heat of a system boundary, water vapor heat of a system, auxiliary equipment heat and fuel atomization steam heat;
the expression of the total external heat is:
Qex＝Qf+Qdes+Qa.d+Qwv+Qaux+Qst.at
wherein Q isfBeing physically sensible heat of the fuel, QdesIs the physical sensible heat of a desulfurizer, Qa.dFor system boundary dry air heat, QwvAs heat of the system steam, QauxFor auxiliary plant heat, Qst.atIs the fuel oil atomization steam heat.
Optionally, the calculation formula of the total fuel low heating value is as follows:
wherein q ism.f.iIs the consumption of the i-th fuel component, Qnet.ar.iIs the lower calorific value, omega, of the ith fuelf.iIs the mass fraction of the ith fuel consumption to the total fuel consumption.
Optionally, the second calculating module is specifically configured to:
calculating the boiler thermal efficiency according to the total heat of the input system boundary and the total boiler loss heat by adopting a boiler thermal efficiency calculation formula, wherein the boiler thermal efficiency calculation formula is as follows:
wherein Q isinIs the total heat of the boundary of the input system, QlossFor the total boiler heat loss:
Qloss＝Q2+Q3+Q4+Q5+Q6+Qoth
wherein Q is2、Q3、Q4、Q5、Q6、QothThe heat loss amount of the exhaust smoke, the heat loss amount of the incomplete combustion of the gas, the heat loss amount of the combustible, the heat loss amount of the incomplete combustion of the solid of the oil-fired boiler, the physical heat loss amount of the ash slag and other heat loss amounts are respectively.
The third aspect of the application provides a real-time calculation device for the thermal efficiency of a boiler of a coal-fired thermal power generating unit, which comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the method for calculating the thermal efficiency of the boiler of the coal-fired thermal power generating unit in real time according to the instructions in the program codes.
A fourth aspect of the present application provides a computer-readable storage medium for storing program code for executing the method for calculating thermal efficiency of a coal-fired thermal power generating unit boiler in real time according to the first aspect.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a method for calculating the thermal efficiency of a boiler of a coal-fired thermal power generating unit in real time, which comprises the following steps: acquiring real-time boiler related data of a boiler of a thermal power generating unit; respectively calculating the total external heat, the total fuel low-level heating value and the total boiler loss heat of the boiler of the thermal power generating unit according to the real-time related data; summing calculation is carried out according to the total external heat and the total fuel low-order heating value to obtain the total heat input into the system boundary; the boiler thermal efficiency is calculated from the total heat input to the system boundary and the total boiler lost heat.
The utility model provides a coal-fired thermal power unit boiler thermal efficiency real-time computation method guarantees the reliability of calculated data through acquireing real-time relevant data, and then improves the accuracy of calculated result, not only consider the heat that the fuel burning produced and the heat of boiler loss in addition, still add the external heat of environment in the calculation process, accord with actual conditions more in the thermal analysis, the boiler efficiency that makes the calculation obtain is more accurate, the computational method of more laminating actual conditions also can guarantee the stability of system more. Therefore, the method and the device can solve the technical problems that the calculation result of the existing boiler thermal efficiency calculation method is low in precision and poor in stability.
Drawings
Fig. 1 is a schematic flow chart of a method for calculating thermal efficiency of a boiler of a coal-fired thermal power generating unit in real time according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a device for calculating the thermal efficiency of a boiler of a coal-fired thermal power generating unit in real time according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For convenience of understanding, referring to fig. 1, an embodiment of a method for calculating thermal efficiency of a coal-fired thermal power generating unit boiler in real time provided by the present application includes:
In order to ensure that the measuring point parameters required in the calculation test procedure do not bring unnecessary influence to the calculation process, the real-time boiler related data in the embodiment of the application comprise boiler load, air preheater inlet flue gas temperature, air preheater outlet oxygen amount, air preheater outlet flue gas temperature, actual evaporation capacity, fly ash slag carbon content and the like. And related data can be obtained according to needs, basic calculation of some systems can be carried out according to the related data of the real-time boiler, available intermediate variables can be obtained, for example, heat loss or heat entering the boiler can be calculated according to temperature, heat loss of incomplete combustion of corresponding materials can be calculated according to the carbon content of fly ash slag, the heat or mass fraction carried away by each gas can be calculated according to the volume of each gas of the smoke exhaust gas, and the like. The details of the specific basic calculation are not repeated, and the basic parameters required by the embodiment can be obtained by calculating the acquired real-time boiler related data and used in the subsequent boiler efficiency calculation.
And 102, respectively calculating the total external heat, the total fuel low-level heating value and the total boiler loss heat of the boiler of the thermal power generating unit according to the real-time related data.
The real-time related data may not be directly calculated by one step to obtain total external heat, total fuel low-order calorific value and total boiler loss heat, but may be calculated by multiple levels, specifically, multiple data of adjacent time sequences may be obtained in real time in the SIS database, and an average value is obtained to participate in calculation, for example, an average temperature value, an average volume of air, an average mass of fuel, an average humidity of air, and the like, which are not described in detail. The real-time relevant data related to the following calculation process of the application comprise the fuel temperature entering the system boundary, the mass flow and the temperature of the desulfurizing agent, the information of primary air and secondary air entering the system boundary, the temperature of air entering the system, the power of auxiliary equipment in the system, the atomized steam information and the like.
Further, the total extraneous heat includes: physical sensible heat of fuel, physical sensible heat of a desulfurizer, dry air heat of a system boundary, water vapor heat of a system, auxiliary equipment heat and fuel atomization steam heat;
the expression of the total external heat is:
Qex＝Qf+Qdes+Qa.d+Qwv+Qaux+Qst.at
wherein Q isfBeing physically sensible heat of the fuel, QdesIs the physical sensible heat of a desulfurizer, Qa.dFor system boundary dry air heat, QwvAs heat of the system steam, QauxFor auxiliary plant heat, Qst.atIs the fuel oil atomization steam heat.
The calculation mode of the physical sensible heat of the fuel is as follows:
Qf＝cf(tf-tre)
wherein, cfIs the specific heat of the fuel, and has the unit of (kJ/kg), tfTemperature of fuel entering the boundary of the system, treThe unit is the reference temperature, which is measured in degrees celsius, and the reference temperature selected in this embodiment is 25 ℃.
The calculation method of the physical sensible heat of the desulfurizer is as follows:
wherein q ism.desThe mass flow of the desulfurizing agent is expressed in the unit of (kJ/h), qm.fAs fuel mass flow rate, cdesIs the specific heat of the desulfurizing agent, tdesIs the temperature of the desulfurizing agent entering the boundary of the system.
The calculation method of the dry air heat of the system boundary comprises the following steps:
wherein q ism.a.p、qm.a.sMass flow of primary and secondary air respectively entering the system boundary, cp.a.p、cp.a.sRespectively the constant pressure specific heat capacity rho of the primary air and the secondary air entering the boundary of the systema.reAir density (kg/m) at reference temperature3)，ρap、ρasPrimary and secondary air density, c, respectively, into the system boundaryp.a.reIs the specific heat capacity of air under constant pressure at a reference temperature, qm.a.othOther air mass flows to the system boundary, cp.a.othFor entering other air at the boundary of the system, t is the specific heat capacity at constant pressurea.othOther air temperatures, p, for entering the system boundarya.othOther air densities are entering the system boundary.
The calculation method of the heat of the water vapor of the system comprises the following steps:
Qwv＝1.293αcrVa.d.th.crha.abcp.wv(ta.wm-tre)
wherein, cp.wvFor the specific heat at constant pressure of water vapour, h, determined according to the weighted average temperature of the air entering the system boundarya.abAbsolute humidity of the air entering the system, alphacrFor calculating the parameters, Va.d.th.crVolume of air to enter the system, ta.wmThe average temperature is weighted for the air entering the system. Wherein the air weighted average temperature ta.wmThe calculation method is as follows:
wherein, ta.p、ta.sThe temperatures of the primary air and the secondary air entering the boundary of the system are respectively.
The heat of the auxiliary equipment is calculated in the following way:
wherein p isauxFor auxiliary plant power (KW), η within system boundariestr.auxAuxiliary drive power (%) within the system boundaries.
The calculation method of the fuel oil atomization steam heat is as follows:
wherein q ism.st.atFor atomizing steam mass flow, Hst.at.enFor the enthalpy (kJ/kg), H, of the atomizing steam at the inlet parametersst.sat.reIs the saturated steam enthalpy value at the reference temperature.
Further, the calculation formula of the total fuel low heating value is as follows:
wherein q ism.f.iIs the consumption of the i-th fuel component, Qnet.ar.iIs the lower calorific value, omega, of the ith fuelf.iIf there are a plurality of mixed gases, it is necessary to calculate different gases for the mass fraction of the ith fuel consumption to the total fuel consumption.
The total boiler heat loss is the heat loss Q of the exhaust smoke2Heat loss due to incomplete combustion of gas Q3Heat loss of combustible material Q4Solid blank of oil-fired boilerTotal heat loss from combustion Q5Ash physical heat loss Q6And other heat loss amounts QothAnd (4) summing.
Specifically, the heat loss Q of the exhaust gas2The calculation method is as follows:
Q2＝Q2.fg.d+Q2.wv.fg
wherein Q is2.fg.dFor the heat taken away by the dry flue gas, Q2.wv.fgThe heat taken away by the water vapor in the flue gas. Wherein Q is2.fg.dThe calculation formula of (2) is as follows:
Q2.fg.d＝Vfg.d.AH.lvcp.fg.d(tfg.AH.lv-tre)
wherein, Vfg.d.AH.lvVolume of dry flue gas (m) generated for combustion of fuel per kilogram of air preheater exit3/kg)，cp.fg.dFor dry flue gas from treTo tfg.AH.lvSpecific heat capacity at constant pressure (kJ/m)3.K)，tfg.AH.lvIs the temperature of the flue gas at the outlet of the air preheater.
Heat loss Q due to incomplete combustion of gas3The calculation method is as follows:
Q3＝q3×Qnet.ar.g
wherein q is3Probability of heat loss of incompletely combusted gas, Qnet.ar.gHeat is generated for all gases within the system boundary.
Heat loss Q of combustibles4The calculation method is as follows:
Q4＝3.3727ωas.arωc.rs.m
ωas.arheat, omega, to be carried away by the fuel slagc.rs.mThe heat removed for the fuel ash.
Heat loss Q of incomplete combustion of solid in oil burning boiler5The calculation method is as follows:
Q5＝3.3727ρc.fgVfg.d.AH.lv
where ρ isc.fgIs the mass concentration (g/m) of carbon in the flue gas3)。
Physical heat loss Q of ash6Is calculated byThe method comprises the following steps:
wherein, cs、cpd、casSpecific heat of the slag, the settled ash and the fly ash respectively; t is ts、tpd、tasThe temperatures of the slag, settled ash and fly ash, respectively; omegas、ωpd、ωasRespectively the heat, omega, taken away by the slag, the settled ash and the fly ashc.s、ωc.pd、ωc.asThe combustible content in the slag, the combustible content in the settled ash and the combustible content in the fly ash are respectively.
Other heat loss QothThe calculation method is as follows:
Qoth＝Qpr+Qcw
wherein Q isprHeat removal for pebble coal, QcwThe heat taken away by the cooling water. Wherein Q isprThe calculation process of (2) is as follows:
wherein q ism.prDischarge of pebble coal, Qnet.prIs the low calorific value of the pebble coal.
QcwThe calculation process of (2) is as follows:
wherein q ism.cwFlow of cooling water into the boundary of the boiler system, Hcw.lvFor cooling the enthalpy value of the book at the outlet of the cooling device, Hcw.enThe enthalpy value of cooling water at the inlet of the cooling device.
And 103, carrying out summation calculation according to the total external heat and the total fuel low-order heating value to obtain the total heat input to the system boundary.
The specific calculation method of the total heat input into the system boundary is as follows:
Qin＝Qnet.ar.to+Qex
besides the total heat quantity input into the system boundary, the total heat quantity output from the system boundary can be calculated, wherein the total heat quantity comprises the heat quantity taken away by steam, sewage and other substances; the total heat of the boundary of the output system can be combined with the total heat of the boundary of the input system to calculate the thermal efficiency of the boiler, and the thermal efficiency of the boiler is calculated by adopting a front-side method.
And 104, calculating the thermal efficiency of the boiler according to the total heat input into the system boundary and the total boiler loss heat.
Further, step 104 includes:
and calculating the thermal efficiency of the boiler according to the total heat input to the system boundary and the total boiler loss heat by adopting a boiler thermal efficiency calculation formula, wherein the boiler thermal efficiency calculation formula is as follows:
wherein Q isinFor the total heat input into the system boundary, QlossFor total boiler heat loss:
Qloss＝Q2+Q3+Q4+Q5+Q6+Qoth
wherein Q is2、Q3、Q4、Q5、Q6、QothThe heat loss amount of the exhaust smoke, the heat loss amount of the incomplete combustion of the gas, the heat loss amount of the combustible, the heat loss amount of the incomplete combustion of the solid of the oil-fired boiler, the physical heat loss amount of the ash slag and other heat loss amounts are respectively.
The utility model provides a coal-fired thermal power unit boiler thermal efficiency real-time computation method, through obtaining the reliability that real-time relevant data guaranteed the calculated data, and then improve the accuracy of calculated result, not only consider the heat that fuel burning produced and the heat of boiler loss in addition, still add the external heat of environment in the calculation process, accord with actual conditions more in the thermal analysis, the boiler efficiency that makes the calculation obtain is more accurate, the computational method of more laminating actual conditions also can guarantee the stability of system more. Therefore, the technical problems that the calculation result of the existing boiler thermal efficiency calculation method is low in accuracy and poor in stability can be solved.
For easy understanding, please refer to fig. 2, the present application provides an embodiment of a device for calculating thermal efficiency of a coal-fired thermal power generating unit boiler in real time, comprising:
an obtaining module 201, configured to obtain real-time boiler related data of a boiler of a thermal power generating unit;
the first calculation module 202 is used for calculating total external heat, total fuel low-level heating value and total boiler loss heat of the boiler of the thermal power generating unit according to the real-time related data;
the summing module 203 is used for performing summing calculation according to the total external heat and the total fuel low-order heating value to obtain the total heat input to the system boundary;
a second calculation module 204 is configured to calculate the boiler thermal efficiency based on the total heat input to the system boundary and the total boiler lost heat.
Further, the total extraneous heat includes: physical sensible heat of fuel, physical sensible heat of a desulfurizer, dry air heat of a system boundary, water vapor heat of a system, auxiliary equipment heat and fuel atomization steam heat;
the expression of the total external heat is:
Qex＝Qf+Qdes+Qa.d+Qwv+Qaux+Qst.at
wherein Q isfBeing physically sensible heat of the fuel, QdesIs the physical sensible heat of a desulfurizer, Qa.dFor system boundary dry air heat, QwvAs heat of the system steam, QauxFor auxiliary plant heat, Qst.atIs the fuel oil atomization steam heat.
Further, the calculation formula of the total fuel low heating value is as follows:
wherein q ism.f.iIs the consumption of the i-th fuel component, Qnet.ar.iIs the lower calorific value, omega, of the ith fuelf.iIs the mass fraction of the ith fuel consumption to the total fuel consumption.
Further, the second calculating module 204 is specifically configured to:
and calculating the thermal efficiency of the boiler according to the total heat input to the system boundary and the total boiler loss heat by adopting a boiler thermal efficiency calculation formula, wherein the boiler thermal efficiency calculation formula is as follows:
wherein Q isinFor the total heat input into the system boundary, QlossFor total boiler heat loss:
Qloss＝Q2+Q3+Q4+Q5+Q6+Qoth
wherein Q is2、Q3、Q4、Q5、Q6、QothThe heat loss amount of the exhaust smoke, the heat loss amount of the incomplete combustion of the gas, the heat loss amount of the combustible, the heat loss amount of the incomplete combustion of the solid of the oil-fired boiler, the physical heat loss amount of the ash slag and other heat loss amounts are respectively.
The application also provides a real-time calculation device for the thermal efficiency of the boiler of the coal-fired thermal power generating unit, which comprises a processor and a memory;
the memory is used for storing the program codes and transmitting the program codes to the processor;
the processor is used for executing the method for calculating the thermal efficiency of the coal-fired thermal power generating unit boiler in the embodiment of the method according to the instructions in the program codes.
The application also provides a computer-readable storage medium for storing program codes, and the program codes are used for executing the method for calculating the thermal efficiency of the coal-fired thermal power generating unit boiler in the embodiment of the method.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for executing all or part of the steps of the method described in the embodiments of the present application through a computer device (which may be a personal computer, a server, or a network device). And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A method for calculating the thermal efficiency of a boiler of a coal-fired thermal power generating unit in real time is characterized by comprising the following steps:
acquiring real-time boiler related data of a boiler of a thermal power generating unit;
respectively calculating the total external heat, the total fuel low-level heating value and the total boiler loss heat of the boiler of the thermal power generating unit according to the real-time related data;
summing and calculating according to the total external heat and the total fuel low-order heating value to obtain the total heat input to the system boundary;
and calculating the boiler thermal efficiency according to the total heat input to the system boundary and the total boiler loss heat.
2. The method for calculating the thermal efficiency of the boiler of the coal-fired thermal power generating unit in real time according to claim 1, wherein the total external heat comprises: physical sensible heat of fuel, physical sensible heat of a desulfurizer, dry air heat of a system boundary, water vapor heat of a system, auxiliary equipment heat and fuel atomization steam heat;
the expression of the total external heat is:
Qex＝Qf+Qdes+Qa.d+Qwv+Qaux+Qst.at
wherein Q isfBeing physically sensible heat of the fuel, QdesIs the physical sensible heat of a desulfurizer, Qa.dFor system boundary dry air heat, QwvAs heat of the system steam, QauxFor auxiliary plant heat, Qst.atIs the fuel oil atomization steam heat.
3. The method for calculating the thermal efficiency of the boiler of the coal-fired thermal power generating unit in real time according to claim 1, wherein the calculation formula of the total fuel low-grade heating value is as follows:
wherein q ism.f.iIs the consumption of the i-th fuel component, Qnet.ar.iIs the lower calorific value, omega, of the ith fuelf.iIs the mass fraction of the ith fuel consumption to the total fuel consumption.
4. The method for calculating the thermal efficiency of the boiler of the coal-fired thermal power generating unit in real time according to the claim 1, wherein the step of calculating the thermal efficiency of the boiler according to the total heat of the input system boundary and the total boiler loss heat comprises the following steps:
calculating the boiler thermal efficiency according to the total heat of the input system boundary and the total boiler loss heat by adopting a boiler thermal efficiency calculation formula, wherein the boiler thermal efficiency calculation formula is as follows:
wherein Q isinIs the total heat of the boundary of the input system, QlossFor the total boiler heat loss:
Qloss＝Q2+Q3+Q4+Q5+Q6+Qoth
wherein Q is2、Q3、Q4、Q5、Q6、QothThe heat loss amount of the exhaust smoke, the heat loss amount of the incomplete combustion of the gas, the heat loss amount of the combustible, the heat loss amount of the incomplete combustion of the solid of the oil-fired boiler, the physical heat loss amount of the ash slag and other heat loss amounts are respectively.
5. The utility model provides a coal-fired thermal power generating unit boiler thermal efficiency real-time computation device which characterized in that includes:
the acquisition module is used for acquiring real-time boiler related data of the thermal power generating unit boiler;
the first calculation module is used for calculating total external heat, total fuel low-level heating value and total boiler loss heat of the boiler of the thermal power generating unit according to the real-time related data;
the summing module is used for carrying out summing calculation according to the total external heat and the total fuel low-order heating value to obtain the total heat input to the system boundary;
and the second calculation module is used for calculating the thermal efficiency of the boiler according to the total heat of the input system boundary and the total boiler loss heat.
6. The coal-fired thermal power generating unit boiler thermal efficiency real-time calculation device according to claim 5, wherein the total external heat includes: physical sensible heat of fuel, physical sensible heat of a desulfurizer, dry air heat of a system boundary, water vapor heat of a system, auxiliary equipment heat and fuel atomization steam heat;
the expression of the total external heat is:
Qex＝Qf+Qdes+Qa.d+Qwv+Qaux+Qst.at
wherein Q isfBeing physically sensible heat of the fuel, QdesIs the physical sensible heat of a desulfurizer, Qa.dFor system boundary dry air heat, QwvAs heat of the system steam, QauxFor auxiliary plant heat, Qst.atIs the fuel oil atomization steam heat.
7. The real-time thermal efficiency calculation device for the boiler of the coal-fired thermal power generating unit according to claim 5, wherein the calculation formula of the total fuel low-grade heating value is as follows:
wherein q ism.f.iIs the consumption of the i-th fuel component, Qnet.ar.iIs the lower calorific value, omega, of the ith fuelf.iIs the mass fraction of the ith fuel consumption to the total fuel consumption.
8. The device for calculating the thermal efficiency of the boiler of the coal-fired thermal power generating unit in real time according to claim 5, wherein the second calculation module is specifically configured to:
calculating the boiler thermal efficiency according to the total heat of the input system boundary and the total boiler loss heat by adopting a boiler thermal efficiency calculation formula, wherein the boiler thermal efficiency calculation formula is as follows:
wherein Q isinIs the total heat of the boundary of the input system, QlossFor the total boiler heat loss:
Qloss＝Q2+Q3+Q4+Q5+Q6+Qoth
wherein Q is2、Q3、Q4、Q5、Q6、QothThe heat loss amount of the exhaust smoke, the heat loss amount of the incomplete combustion of the gas, the heat loss amount of the combustible, the heat loss amount of the incomplete combustion of the solid of the oil-fired boiler, the physical heat loss amount of the ash slag and other heat loss amounts are respectively.
9. The real-time calculation equipment for the thermal efficiency of the boiler of the coal-fired thermal power generating unit is characterized by comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the method for calculating the thermal efficiency of the coal-fired thermal power generating unit boiler in real time according to the instructions in the program codes, wherein the method is as defined in any one of claims 1 to 4.
10. A computer-readable storage medium for storing a program code for executing the method for calculating thermal efficiency of a coal-fired thermal power unit boiler in real time according to any one of claims 1 to 4.
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