CN109357896B - Method and device for detecting running performance of air pre-heater - Google Patents
Method and device for detecting running performance of air pre-heater Download PDFInfo
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Abstract
The invention provides a method and a device for detecting the running performance of an air preheater, wherein the method comprises the following steps: simplifying the air preheater into a first heat exchanger and a second heat exchanger according to an air preheater theoretical simplified model; acquiring a first operating parameter of a first heat exchanger and a second operating parameter of a second heat exchanger; obtaining a first characteristic parameter of the first heat exchanger in a test state according to the first operation parameter, and obtaining a second characteristic parameter of the second heat exchanger in the test state according to the second operation parameter; obtaining a first performance parameter of the first heat exchanger in a boundary state according to the first characteristic parameter, and obtaining a second performance parameter of the second heat exchanger in the boundary state according to the second characteristic parameter; obtaining the performance parameters of the air preheater according to the first performance parameters and the second performance parameters; and determining the performance state of the air preheater according to the performance parameters of the air preheater and a preset parameter threshold. The method and the device for detecting the running performance of the air preheater provided by the invention realize quantitative detection of the performance of the air preheater.
Description
Technical Field
The invention belongs to the technical field of performance detection of air pre-heaters, and particularly relates to a method and a device for detecting the running performance of an air pre-heater.
Background
The three-bin air preheater is used as important heat exchanger equipment of boiler equipment, and has important functions of recovering waste heat of boiler exhaust heat and improving the operation efficiency of the boiler. With the development of the power unit to high capacity and high parameter, the working performance of the three-compartment air preheater in the power plant has greater and greater influence on the economy of the power plant. Taking a certain 600MW unit as an example, when the temperature of the exhaust gas at the outlet of the air preheater is increased by 10 ℃, the boiler efficiency is influenced by 0.5 percent, and the coal consumption of the power plant for generating electricity is directly increased by about 1.5 g/kW.h.
At present, the running state of the air preheater is mainly judged by manual experience, no effective means is available for quantitative detection, but the judgment result of the manual experience is not accurate, and a great problem exists in energy-saving evaluation of a power plant unit.
Disclosure of Invention
The invention aims to provide a method and a device for detecting the running performance of an air preheater, which are used for solving the technical problem that the running state of the air preheater cannot be quantitatively detected in the prior art.
In a first aspect of the embodiments of the present invention, a method for detecting an operation performance of an air preheater is provided, including:
simplifying the air preheater into a first heat exchanger and a second heat exchanger based on an air preheater theoretical simplified model;
acquiring a first operating parameter of a first heat exchanger and a second operating parameter of a second heat exchanger;
obtaining a first characteristic parameter of the first heat exchanger in a test state according to the first operation parameter, and obtaining a second characteristic parameter of the second heat exchanger in the test state according to the second operation parameter;
obtaining a first performance parameter of the first heat exchanger in a boundary state according to the first characteristic parameter, and obtaining a second performance parameter of the second heat exchanger in the boundary state according to the second characteristic parameter;
obtaining a performance parameter of the air preheater according to the first performance parameter and the second performance parameter;
and determining the performance state of the air preheater according to the performance parameters of the air preheater and a preset parameter threshold.
In a second aspect of the embodiments of the present invention, there is provided an apparatus for detecting an operation performance of an air preheater, including:
the model conversion module is used for simplifying the air preheater into a first heat exchanger and a second heat exchanger based on an air preheater theoretical simplification model;
the parameter acquisition module is used for acquiring a first operating parameter of the first heat exchanger and a second operating parameter of the second heat exchanger;
the characteristic parameter acquisition module is used for acquiring a first characteristic parameter of the first heat exchanger in a test state according to the first operation parameter and acquiring a second characteristic parameter of the second heat exchanger in the test state according to the second operation parameter;
the performance parameter acquisition module is used for acquiring a first performance parameter of the first heat exchanger in a boundary state according to the first characteristic parameter and acquiring a second performance parameter of the second heat exchanger in the boundary state according to the second characteristic parameter;
the performance parameter determining module is used for obtaining the performance parameters of the air preheater according to the first performance parameters and the second performance parameters;
and the performance state determining module is used for determining the performance state of the air preheater according to the performance parameters of the air preheater and a preset parameter threshold.
In a third aspect of the embodiments of the present invention, there is provided a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method according to the first aspect when executing the computer program.
In a fourth aspect of the embodiments of the present invention, a computer-readable storage medium is provided, which stores a computer program, and the computer program realizes the steps of the method according to the first aspect when being executed by a processor.
The method and the device for detecting the running performance of the air preheater have the beneficial effects that: the method comprises the steps of firstly calculating characteristic parameters of the air pre-heater based on the operation parameters of the air pre-heater in operation, then calculating corresponding performance parameters of the air pre-heater based on the characteristic parameters of the air pre-heater, and adopting the performance parameters of the air pre-heater as main parameters for judging the running state of the air pre-heater, so that the quantitative detection of the performance of the air pre-heater is realized, the data acquisition is simple, and the implementation is convenient.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for detecting operation performance of an air preheater according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for detecting operation performance of an air preheater according to another embodiment of the present invention;
fig. 3 is a schematic flowchart of a method for detecting operation performance of an air preheater according to yet another embodiment of the present invention;
fig. 4 is a schematic flowchart of a method for detecting operation performance of an air preheater according to another embodiment of the present invention;
fig. 5 is a schematic flowchart of a method for detecting operation performance of an air preheater according to another embodiment of the present invention;
fig. 6 is a schematic flowchart of a method for detecting operation performance of an air preheater according to another embodiment of the present invention;
fig. 7 is a block diagram illustrating an operation performance detecting apparatus of an air preheater according to an embodiment of the present invention;
fig. 8 is a block diagram of an operation performance detecting apparatus of an air preheater according to another embodiment of the present invention;
fig. 9 is a block diagram illustrating an operation performance detecting apparatus of an air preheater according to still another embodiment of the present invention;
fig. 10 is a schematic block diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic flowchart of a method for detecting an operation performance of an air preheater according to an embodiment of the present invention. The method comprises the following steps:
s101: and simplifying the air preheater into a first heat exchanger and a second heat exchanger based on an air preheater theoretical simplified model.
In this embodiment, the theory of the three-compartment air preheater is first simplified into two parallel heat exchangers, i.e., a first heat exchanger and a second heat exchanger, where the first heat exchanger is a heat exchanger for primary air and flue gas, and the second heat exchanger is a heat exchanger for secondary air and flue gas. The flue gas at the outlet of the two heat exchangers is mixed to discharge smoke at the outlet of the air preheater, and the two heat exchangers are both counter-flow heat exchangers.
And secondly, air leakage of the air preheater is simplified into two main parts, namely cold-end air leakage and hot-end air leakage. The cold end air leakage is directly leaked to the outlet of the heat exchanger to be mixed with the flue gas, and the hot end air leakage is leaked to the inlet of the air preheater to be mixed with the hot flue gas.
The inlet flue gas amount distribution proportion of the two heat exchangers is determined according to the actual proportion of the primary air sectional area and the secondary air sectional area of the air preheater.
S102: a first operating parameter of the first heat exchanger and a second operating parameter of the second heat exchanger are obtained.
In this embodiment, the air preheater should be performed in an internal cleaning state of the air preheater. Before obtaining the operation parameters of the air preheater, firstly, carrying out complete soot blowing on the air preheater under the load of 100% of a unit, and measuring the operation parameters of the air preheater after the soot blowing is finished. The first operation parameter comprises but is not limited to mass flow of inlet flue gas of the air preheater, inlet flue gas temperature, mass of primary air at the inlet of the air preheater, inlet primary air temperature and outlet primary air temperature of the air preheater; the second operation parameters include, but are not limited to, air preheater inlet secondary air quality, inlet secondary air temperature, air preheater outlet flue gas temperature, and air preheater total air leakage rate. The air leakage of the primary air side and the secondary air side is distributed according to the design proportion, and the proportion of the cold end air leakage to the hot end air leakage is 1: 1.
s103: and obtaining a first characteristic parameter of the first heat exchanger in the test state according to the first operation parameter, and obtaining a second characteristic parameter of the second heat exchanger in the test state according to the second operation parameter.
In this embodiment, the characteristic parameter is the product of the heat transfer coefficient and the heat exchange area.
S104: and obtaining a first performance parameter of the first heat exchanger in the boundary state according to the first characteristic parameter, and obtaining a second performance parameter of the second heat exchanger in the boundary state according to the second characteristic parameter.
In this embodiment, the performance parameters include, but are not limited to, the outlet air temperature of the air preheater and the corresponding relevant operating parameters.
S105: and obtaining the performance parameters of the air preheater according to the first performance parameters and the second performance parameters.
In this embodiment, the exhaust gas temperature of the air preheater may be calculated according to the first performance parameter and the second performance parameter, and the exhaust gas temperature is the performance parameter of the air preheater.
S106: and determining the performance state of the air preheater according to the performance parameters of the air preheater and a preset parameter threshold.
In this embodiment, the performance parameter of the air preheater is compared with the design performance parameter, and the performance state of the air preheater is determined according to the magnitude of the two parameter values.
As can be seen from the above description, in the embodiment of the present invention, the characteristic parameters of the air pre-heater are calculated based on the operating parameters of the operating air pre-heater, the corresponding performance parameters of the air pre-heater are calculated based on the characteristic parameters of the air pre-heater, and the performance parameters of the air pre-heater are used as the main parameters for determining the quality of the operating state of the air pre-heater, so that the quantitative detection of the performance of the air pre-heater is realized, the data acquisition is simple, and the implementation is convenient.
Referring to fig. 2, fig. 2 is a schematic flowchart of a method for detecting operation performance of an air preheater according to another embodiment of the present application. On the basis of the above embodiment, obtaining the first characteristic parameter of the first heat exchanger in the test state according to the first operating parameter includes:
s201: and obtaining the total heat exchange quantity of the first heat exchanger according to the first operation parameter.
In this embodiment, the calculation expression of the total heat exchange amount of the first heat exchanger is as follows:
in the formula (1), Q1Is the total heat exchange capacity of the first heat exchanger,
the mass of primary air at the inlet of the air preheater,
for total air leakage of air preheater, RlpaThe proportion of primary air leakage of the air preheater hpaoThe temperature of primary air at the outlet of the air preheater corresponds to the enthalpy value hpaiThe temperature of primary air at the inlet of the air preheater corresponds to the enthalpy value.
S202: and obtaining the inlet smoke mixing enthalpy value of the air preheater according to the first operation parameter.
In this embodiment, the calculation expression of the enthalpy value of the inlet flue gas is:
in the formula (2), the reaction mixture is,
for the inlet flue gas quality of the air preheater hFGiFor the air preheater inlet flue gas temperature corresponding enthalpy value, RlsaThe proportion of secondary air leakage of the air preheater hsaoFor the temperature of secondary air at the outlet of the air preheater corresponds to the enthalpy value hFGmiIs the mixed enthalpy value of the inlet flue gas of the first heat exchanger and the second heat exchanger.
S203: and obtaining the outlet flue gas temperature enthalpy value of the first heat exchanger according to the inlet flue gas mixed enthalpy value and the total heat exchange quantity of the first heat exchanger.
In this embodiment, the calculation expression of the outlet flue gas temperature enthalpy value of the first heat exchanger is as follows:
in the formula (3), RFGpIs the inlet flue gas ratio h of the primary air heat exchanger of the air preheaterFGo1Being a first heat exchangerOutlet flue gas temperature enthalpy.
S204: and obtaining a first characteristic parameter of the first heat exchanger according to the outlet flue gas temperature enthalpy value of the first heat exchanger.
In this embodiment, the calculation expression of the first characteristic parameter is:
in the formula (4), C1Is the heat exchange coefficient of the first heat exchanger, A1Is the heat exchange area of the first heat exchanger, C1×A1Is a first characteristic parameter, t, of the first heat exchangerFGo1Is the outlet flue gas temperature, t, of the first heat exchangerpaiFor the inlet primary air temperature, t, of the air preheaterFGmiIs the mixing temperature of the inlet flue gas, tpaoThe temperature of primary air at the outlet of the air preheater.
Wherein, the temperature can be converted from the corresponding enthalpy value.
Referring to fig. 3, fig. 3 is a schematic flowchart of a method for detecting an operation performance of an air preheater according to yet another embodiment of the present application. On the basis of the above embodiment, obtaining the second characteristic parameter of the second heat exchanger in the test state according to the second operating parameter includes:
s301: and obtaining the total heat exchange quantity of the second heat exchanger according to the second operation parameter.
In this embodiment, the calculation expression of the total heat exchange amount of the second heat exchanger is:
in the formula (5), Q2Is the total heat exchange capacity of the second heat exchanger,
the mass of secondary air at the inlet of the air preheater,
for total air leakage of air preheater, RlsaIs emptySecondary air leakage rate of the device, hsaoFor the temperature of secondary air at the outlet of the air preheater corresponds to the enthalpy value hsaiThe temperature of secondary air at the inlet of the air preheater corresponds to the enthalpy value.
S302: and obtaining the inlet smoke mixing enthalpy value of the air preheater according to the second operation parameter.
In this embodiment, the calculation expression of the enthalpy value of the inlet flue gas is:
in the formula (6), the reaction mixture is,
for the inlet flue gas quality of the air preheater hFGiFor the air preheater inlet flue gas temperature corresponding enthalpy value, RlsaThe proportion of secondary air leakage of the air preheater hsaoFor the temperature of secondary air at the outlet of the air preheater corresponds to the enthalpy value hFGmiIs the mixed enthalpy value of the inlet flue gas of the first heat exchanger and the second heat exchanger.
S303: and obtaining the outlet flue gas temperature enthalpy value of the second heat exchanger according to the inlet flue gas mixed enthalpy value and the total heat exchange quantity of the second heat exchanger.
In this embodiment, the calculation expression of the outlet flue gas temperature enthalpy value of the second heat exchanger is as follows:
in the formula (7), RFGsIs the inlet flue gas ratio h of a secondary air heat exchanger of an air preheaterFGo2Is the outlet flue gas temperature enthalpy value of the second heat exchanger.
S304: and obtaining a second characteristic parameter of the second heat exchanger according to the outlet flue gas temperature enthalpy value of the second heat exchanger.
In this embodiment, the calculation expression of the second characteristic parameter is:
in the formula (8), C2Is the heat exchange coefficient of the second heat exchanger, A2Is the heat exchange area of the second heat exchanger, C2×A2Is a second characteristic parameter, t, of the second heat exchangerFGo2Is the outlet flue gas temperature, t, of the second heat exchangersaiFor the inlet secondary air temperature, t, of the air preheaterFGmiIs the mixing temperature of the inlet flue gas, tsaoThe temperature of secondary air at the outlet of the air preheater.
Wherein, the temperature can be converted from the corresponding enthalpy value.
Referring to fig. 4, fig. 4 is a schematic flowchart of a method for detecting operation performance of an air preheater according to another embodiment of the present application. On the basis of the above embodiment, obtaining the first performance parameter of the first heat exchanger in the boundary state according to the first characteristic parameter includes:
s401: and setting the air outlet temperature of the first heat exchanger in the boundary state and obtaining the air outlet enthalpy value of the first heat exchanger in the boundary state according to the air outlet temperature of the first heat exchanger in the boundary state.
In this embodiment, the outlet air temperature of the primary air at the outlet of the first heat exchanger is set to tpaoGThen the corresponding enthalpy value is hpaoG。
S402: and obtaining a first mixed enthalpy value of the inlet flue gas in the boundary state according to the air outlet enthalpy value of the first heat exchanger in the boundary state.
In this embodiment, the calculation formula of the first mixing enthalpy value of the inlet flue gas in the boundary state is as follows:
in the formula (9), the reaction mixture is,
is a design value h of the inlet smoke quality of the air preheaterFGiDIs a design value of the temperature enthalpy value of the inlet flue gas of the air preheater,
design for total air leakage of air preheaterValue RlpaThe air leakage rate of the primary air of the air preheater is proportional,
is a design value of total air leakage of the air preheater, RlsaThe proportion of secondary air leakage of the air preheater hsaoGIs a set value of secondary air temperature at the outlet of the air preheater hFGmiD1Is the first enthalpy value of the inlet flue gas under the boundary state.
Wherein h issaoGThe design value is temporarily taken.
S403: and obtaining the outlet flue gas temperature enthalpy value of the first heat exchanger in the boundary state according to the first mixed enthalpy value of the inlet flue gas in the boundary state.
In this embodiment, the total heat exchange amount of the first heat exchanger is first calculated:
q 'in the formula (10)'1Is the total heat exchange capacity of the first heat exchanger,
is a design value h of primary air mass at the inlet of an air preheaterpaiDThe design value of the temperature and enthalpy of the primary air at the inlet of the air preheater is obtained.
On the basis, calculating the temperature enthalpy value of the outlet flue gas of the first heat exchanger under the boundary state:
in the formula (11), RFGpIs the inlet flue gas ratio h of a secondary air heat exchanger of an air preheaterFGo1GIs the outlet flue gas temperature enthalpy value of the first heat exchanger under the boundary state.
S404: and obtaining a first characteristic parameter of the first heat exchanger in the boundary state according to the first characteristic parameter.
In this embodiment, the relationship between the first characteristic parameter and the first characteristic parameter of the first heat exchanger in the boundary state is as follows:
in the formula (12), C1DIs the expected heat transfer coefficient of the first heat exchanger at boundary conditions, A1Is the heat exchange area of the first heat exchanger,
is an actual measurement value of the inlet flue gas quality of the air preheater.
S405: and obtaining a first heat exchange quantity parameter of the first heat exchanger according to the first characteristic parameter of the first heat exchanger in the boundary state and the outlet flue gas temperature enthalpy value of the first heat exchanger in the boundary state.
In this embodiment, the calculation formula of the first heat exchange amount parameter is:
in formula (13), Q "1Is a first heat exchange quantity parameter, tFGo1GIs the outlet flue gas temperature, t, of the first heat exchanger in the boundary statepaiDIs a design value of primary air temperature at the inlet of an air preheater, tFGmiD1Is the first mixing temperature of the inlet flue gas at the boundary condition.
Wherein, the temperature can be converted from the corresponding enthalpy value.
S406: and if the first heat exchange quantity parameter meets a first preset heat exchange quantity condition, taking the air outlet temperature of the first heat exchanger in the boundary state as a first performance parameter of the first heat exchanger.
In this embodiment, Q'1Namely the first preset heat exchange quantity parameter in the first preset heat exchange quantity condition, if the first heat exchange quantity parameter Q'1Satisfy | Q'1-Q”1If the absolute value is less than or equal to 0.01, the calculation is finished, and the final primary air outlet temperature is the final assumed value tpaoG。
S407: and if the first heat exchange quantity parameter does not meet the first preset heat exchange quantity condition, returning to the step of executing the setting of the air outlet temperature of the first heat exchanger in the boundary state and obtaining the air outlet enthalpy value of the first heat exchanger in the boundary state according to the air outlet temperature of the first heat exchanger in the boundary state.
In the present embodiment, if the first heat exchange amount parameter Q "1Does not satisfy | Q'1-Q”1|>0.01, then t is resetpaoGThe value of (c) is calculated.
Referring to fig. 5, fig. 5 is a schematic flowchart of a method for detecting operation performance of an air preheater according to another embodiment of the present application. On the basis of the above embodiment, obtaining the first performance parameter of the first heat exchanger in the boundary state according to the first characteristic parameter includes:
s501: and setting the air outlet temperature of the second heat exchanger in the boundary state and obtaining the air outlet enthalpy value of the second heat exchanger in the boundary state according to the air outlet temperature of the second heat exchanger in the boundary state.
In this embodiment, the outlet air temperature of the secondary air at the outlet of the second heat exchanger is set to tsaoGThen the corresponding enthalpy value is hsaoG。
S502: and obtaining a second mixed enthalpy value of the inlet flue gas in the boundary state according to the air outlet enthalpy value of the second heat exchanger in the boundary state.
In this embodiment, the calculation formula of the second mixing enthalpy value of the inlet flue gas in the boundary state is as follows:
in the formula (14), the compound represented by the formula (I),
is a design value h of the inlet smoke quality of the air preheaterFGiDIs a design value of the temperature enthalpy value of the inlet flue gas of the air preheater,
is a design value of total air leakage of the air preheater, RlsaThe air leakage rate of the secondary air of the air preheater is proportional,
is a design value of total air leakage of the air preheater, RlsaThe proportion of secondary air leakage of the air preheater hsaoGIs a set value of secondary air temperature at the outlet of the air preheater hFGmiD2Is the second mixing enthalpy of the inlet flue gas at the boundary state.
Wherein h ispaoGThe design value is temporarily taken.
S503: and obtaining the outlet flue gas temperature enthalpy value of the second heat exchanger in the boundary state according to the second mixed enthalpy value of the inlet flue gas in the boundary state.
In this embodiment, the total heat exchange amount of the second heat exchanger is first calculated:
q 'in the formula (15)'2Is the total heat exchange capacity of the second heat exchanger,
is a design value h of the secondary air quality at the inlet of the air preheatersaiDThe enthalpy value of the secondary air at the inlet of the air preheater is a design value of the temperature enthalpy value of the secondary air at the inlet of the air preheater.
On the basis, calculating the temperature enthalpy value of the outlet flue gas of the second heat exchanger in the boundary state:
in the formula (16), RFGsIs the inlet flue gas ratio h of a secondary air heat exchanger of an air preheaterFGo2GIs the outlet flue gas temperature enthalpy value of the second heat exchanger under the boundary state.
S504: and obtaining a second characteristic parameter of the second heat exchanger in the boundary state according to the second characteristic parameter.
In this embodiment, the relationship between the second characteristic parameter and the second characteristic parameter of the second heat exchanger in the boundary state is as follows:
in the formula (12), C2DIs the expected heat transfer coefficient of the second heat exchanger at boundary conditions, A2Is the heat exchange area of the second heat exchanger,
is an actual measurement value of the inlet flue gas quality of the air preheater.
S505: and obtaining a second heat exchange quantity parameter of the second heat exchanger according to the second characteristic parameter of the second heat exchanger in the boundary state and the outlet flue gas temperature of the second heat exchanger in the boundary state.
In this embodiment, the calculation formula of the second heat exchange quantity parameter is:
in formula (18), Q "2Is a second heat exchange quantity parameter, tFGo2GIs the outlet flue gas temperature, t, of the second heat exchanger in the boundary statesaiDIs a design value of the inlet secondary air temperature of the air preheater, tFGmiD2Is the second mixing temperature of the inlet flue gas at the boundary condition.
Wherein, the temperature can be converted from the corresponding enthalpy value.
S506: and if the second heat exchange quantity parameter meets a second preset heat exchange quantity condition, taking the air outlet temperature of the second heat exchanger in the boundary state as a second performance parameter of the second heat exchanger.
In this embodiment, Q'2Namely the second preset heat exchange quantity parameter in the second preset heat exchange quantity condition, if the second heat exchange quantity parameter Q'2Satisfy | Q'2-Q”2If the absolute value is less than or equal to 0.01, the calculation is finished, and the final secondary air outlet temperature is the final assumed value tsaoG。
S507: and if the second heat exchange quantity parameter does not meet the second preset heat exchange quantity condition, returning to the step of executing the setting of the air outlet temperature of the second heat exchanger in the boundary state and obtaining the air outlet enthalpy value of the second heat exchanger in the boundary state according to the air outlet temperature of the second heat exchanger in the boundary state.
In this embodiment, if the second replacement is performedThermal parameter Q'2Does not satisfy | Q'2-Q”2|>0.01, then t is resetsaoGThe value of (c) is calculated.
In an embodiment of the present invention, to ensure the accuracy of the calculation result, the step of calculating the first performance parameter and the second performance parameter may be repeated once, and the calculation time h is calculatedsaoGAnd hpaoGValues are taken according to the first calculation result. H obtained by this calculationsaoG、hpaoGThe final value of the temperature enthalpy value of the primary air and the secondary air hot air at the outlet of the air preheater is obtained.
In an embodiment of the present invention, obtaining the performance parameter of the air preheater according to the first performance parameter and the second performance parameter includes:
and obtaining the smoke exhaust temperature of the air preheater according to the air outlet temperature of the first heat exchanger in the boundary state and the air outlet temperature of the second heat exchanger in the boundary state.
In this embodiment, the outlet flue gas temperature enthalpy value h of the first heat exchanger may be obtained by first calculating according to the first performance parameter, that is, the outlet air temperature of the first heat exchangerFGo1G(ii) a Calculating to obtain the outlet flue gas temperature enthalpy value h of the second heat exchanger according to the second performance parameter, namely the outlet air temperature of the second heat exchangerFGo2G。
Then according to the outlet flue gas temperature enthalpy value h of the first heat exchangerFGo1GAnd the outlet flue gas temperature enthalpy value h of the second heat exchangerFGo2GCalculating to obtain the smoke exhaust enthalpy value of the air preheater:
in the formula (19), hFGmG0The corresponding exhaust smoke temperature t can be obtained according to the exhaust smoke enthalpy value for the air preheaterFGmG0。
As can be seen from the above description, the embodiment of the present invention quantitatively detects the exhaust gas temperature of the air preheater, and achieves the purpose of quantitatively detecting the performance of the air preheater by comparing the exhaust gas temperature with the design value.
Referring to fig. 6, fig. 6 is a schematic flowchart of a method for detecting operation performance of an air preheater according to another embodiment of the present application. On the basis of the above embodiment, the above step S106 is detailed as follows:
s107: and if the performance parameter of the air preheater is larger than the preset parameter threshold, determining that the performance state of the air preheater is poor.
In this embodiment, if tFGmG0>tFGmDThe operation state of the air preheater is poor, wherein tFGmDDesigned value for exhaust gas temperature.
S108: and if the performance parameter of the air preheater is less than or equal to the preset parameter threshold, determining that the performance state of the air preheater is good.
In this embodiment, if tFGmG0≤tFGmDThe running state of the air preheater is good, wherein tFGmDDesigned value for exhaust gas temperature.
Fig. 7 is a block diagram of a structure of an air preheater performance detecting apparatus according to an embodiment of the present invention, which corresponds to the air preheater performance detecting method according to the foregoing embodiment. For convenience of explanation, only portions related to the embodiments of the present invention are shown. Referring to fig. 7, the apparatus includes: the system comprises a model conversion module 10, a parameter acquisition module 20, a characteristic parameter acquisition module 30, a performance parameter acquisition module 40, a performance parameter determination module 50 and a performance state determination module 60.
The model conversion module 10 is configured to simplify the air preheater into the first heat exchanger and the second heat exchanger based on the air preheater theoretical simplification model.
The parameter obtaining module 20 is configured to obtain a first operating parameter of the first heat exchanger and a second operating parameter of the second heat exchanger.
The characteristic parameter obtaining module 30 is configured to obtain a first characteristic parameter of the first heat exchanger in the test state according to the first operating parameter, and obtain a second characteristic parameter of the second heat exchanger in the test state according to the second operating parameter.
The performance parameter obtaining module 40 is configured to obtain a first performance parameter of the first heat exchanger in the boundary state according to the first characteristic parameter, and obtain a second performance parameter of the second heat exchanger in the boundary state according to the second characteristic parameter.
And the performance parameter determining module 50 is configured to obtain a performance parameter of the air preheater according to the first performance parameter and the second performance parameter.
And a performance state determining module 60, configured to determine a performance state of the air preheater according to the performance parameter of the air preheater and a preset parameter threshold.
Referring to fig. 7 and 8 together, in an embodiment of the present invention, the characteristic parameter obtaining module 30 includes a first characteristic parameter obtaining module 31 and a second characteristic parameter obtaining module 32, where the first characteristic parameter obtaining module 31 includes:
the first heat exchange amount obtaining unit 310 is configured to obtain a total heat exchange amount of the first heat exchanger according to the first operating parameter.
And the first mixing enthalpy value obtaining unit 311 is configured to obtain an inlet flue gas mixing enthalpy value according to the first operation parameter.
The first flue gas temperature obtaining unit 312 is configured to obtain an outlet flue gas temperature of the first heat exchanger according to the inlet flue gas mixing enthalpy value and the total heat exchange amount of the first heat exchanger.
The first characteristic parameter obtaining unit 313 is configured to obtain a first characteristic parameter of the first heat exchanger according to an outlet flue gas temperature enthalpy value of the first heat exchanger.
The second characteristic parameter acquisition module 32 includes:
and a second heat exchange amount obtaining unit 320, configured to obtain a total heat exchange amount of the second heat exchanger according to the second operation parameter.
And a second mixed enthalpy value obtaining unit 321, configured to obtain an inlet flue gas mixed enthalpy value according to the second operation parameter.
And a second flue gas temperature obtaining unit 322, configured to obtain an outlet flue gas temperature of the second heat exchanger according to the inlet flue gas mixing enthalpy value and the total heat exchange amount of the second heat exchanger.
And the second characteristic parameter obtaining unit 323 is configured to obtain a second characteristic parameter of the second heat exchanger according to the outlet flue gas temperature of the second heat exchanger.
Referring to fig. 7 and 9, in an embodiment of the present invention, the performance parameter obtaining module 40 includes a first performance parameter obtaining module 41 and a second performance parameter obtaining module 42.
The first performance parameter obtaining module 41 includes:
the first temperature setting unit 410 is configured to set an air outlet temperature of the first heat exchanger in the boundary state and obtain an air outlet enthalpy value of the first heat exchanger in the boundary state according to the air outlet temperature of the first heat exchanger in the boundary state.
The first mixed enthalpy value determining unit 411 is configured to obtain a first mixed enthalpy value of the inlet flue gas in the boundary state according to an air outlet enthalpy value of the first heat exchanger in the boundary state.
The first flue gas temperature determining unit 412 is configured to obtain an outlet flue gas temperature enthalpy value of the first heat exchanger in the boundary state according to the first mixed enthalpy value of the inlet flue gas in the boundary state.
The first characteristic parameter determining unit 413 is configured to obtain a first characteristic parameter of the first heat exchanger in the boundary state according to the first characteristic parameter.
The first heat exchange amount determining unit 414 is configured to obtain a first heat exchange amount parameter of the first heat exchanger according to the first characteristic parameter of the first heat exchanger in the boundary state and the outlet flue gas temperature enthalpy value of the first heat exchanger in the boundary state.
And if the first heat exchange quantity parameter meets a first preset heat exchange quantity condition, taking the air outlet temperature of the first heat exchanger in the boundary state as a first performance parameter of the first heat exchanger.
And if the first heat exchange quantity parameter does not meet the first preset heat exchange quantity condition, returning to the step of executing the setting of the air outlet temperature of the first heat exchanger in the boundary state and obtaining the air outlet enthalpy value of the first heat exchanger in the boundary state according to the air outlet temperature of the first heat exchanger in the boundary state.
The second performance parameter acquisition module 42 includes:
the second temperature setting unit 420 is configured to set an air outlet temperature of the second heat exchanger in the boundary state and obtain an air outlet enthalpy value of the second heat exchanger in the boundary state according to the air outlet temperature of the second heat exchanger in the boundary state.
And the second mixed enthalpy value determining unit 421 is configured to obtain a second mixed enthalpy value of the inlet flue gas in the boundary state according to the outlet enthalpy value of the second heat exchanger in the boundary state.
And the second flue gas temperature determining unit 422 is used for obtaining the outlet flue gas temperature enthalpy value of the second heat exchanger in the boundary state according to the second mixed enthalpy value of the inlet flue gas in the boundary state.
The second characteristic parameter determining unit 423 is configured to obtain a second characteristic parameter of the second heat exchanger in the boundary state according to the second characteristic parameter.
The second heat exchange amount determining unit 424 is configured to obtain a second heat exchange amount parameter of the second heat exchanger according to the second characteristic parameter of the second heat exchanger in the boundary state and the outlet flue gas temperature enthalpy value of the second heat exchanger in the boundary state.
And if the second heat exchange quantity parameter meets a second preset heat exchange quantity condition, taking the air outlet temperature of the second heat exchanger in the boundary state as a second performance parameter of the second heat exchanger.
And if the second heat exchange quantity parameter does not meet the second preset heat exchange quantity condition, returning to the step of executing the setting of the air outlet temperature of the second heat exchanger in the boundary state and obtaining the air outlet enthalpy value of the second heat exchanger in the boundary state according to the air outlet temperature of the second heat exchanger in the boundary state.
Referring to fig. 10, fig. 10 is a schematic block diagram of a terminal device according to an embodiment of the present invention. The terminal 600 in the present embodiment as shown in fig. 10 may include: one or more processors 601, one or more input devices 602, one or more output devices 603, and one or more memories 604. The processor 601, the input device 602, the output device 603 and the memory 604 are all connected to each other via a communication bus 605. The memory 604 is used to store computer programs, which include program instructions. Processor 601 is operative to execute program instructions stored in memory 604. Wherein the processor 601 is configured to call program instructions to perform the following functions for operating the modules/units in the above-described device embodiments, such as the functions of the modules 10 to 60 shown in fig. 7.
It should be understood that, in the embodiment of the present invention, the Processor 601 may be a Central Processing Unit (CPU), and the Processor may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The input device 602 may include a touch pad, a fingerprint sensor (for collecting fingerprint information of a user and direction information of the fingerprint), a microphone, etc., and the output device 603 may include a display (LCD, etc.), a speaker, etc.
The memory 604 may include both read-only memory and random access memory, and provides instructions and data to the processor 601. A portion of the memory 604 may also include non-volatile random access memory. For example, the memory 604 may also store device type information.
In specific implementation, the processor 601, the input device 602, and the output device 603 described in this embodiment of the present invention may execute the implementation manners described in the first embodiment and the second embodiment of the method for detecting the operation performance of the air preheater provided in this embodiment of the present invention, and may also execute the implementation manners of the terminal described in this embodiment of the present invention, which is not described herein again.
In another embodiment of the present invention, a computer-readable storage medium is provided, in which a computer program is stored, the computer program includes program instructions, when executed by a processor, implement all or part of the processes in the method of the above embodiments, and may also be implemented by a computer program instructing associated hardware, and the computer program may be stored in a computer-readable storage medium, and when executed by a processor, implement the steps of the above method embodiments. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may include any suitable increase or decrease as required by legislation and patent practice in the jurisdiction, for example, in some jurisdictions, computer readable media may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The computer readable storage medium may be an internal storage unit of the terminal of any of the foregoing embodiments, for example, a hard disk or a memory of the terminal. The computer readable storage medium may also be an external storage device of the terminal, such as a plug-in hard disk provided on the terminal, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. Further, the computer-readable storage medium may also include both an internal storage unit and an external storage device of the terminal. The computer-readable storage medium is used for storing a computer program and other programs and data required by the terminal. The computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the terminal and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed terminal and method can be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, 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 also be an electric, mechanical or other form of connection.
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 of the present invention.
In addition, functional units in the embodiments of the present invention 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.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for detecting the running performance of an air preheater is characterized by comprising the following steps:
simplifying the air preheater into a first heat exchanger and a second heat exchanger based on an air preheater theoretical simplified model; the first heat exchanger is a heat exchanger of primary air and flue gas, the second heat exchanger is a heat exchanger of secondary air and flue gas, and the flue gas at the outlets of the first heat exchanger and the second heat exchanger is mixed to discharge smoke at the outlet of the air preheater;
acquiring a first operating parameter of a first heat exchanger and a second operating parameter of a second heat exchanger;
obtaining a first characteristic parameter of the first heat exchanger in a test state according to the first operation parameter, and obtaining a second characteristic parameter of the second heat exchanger in the test state according to the second operation parameter;
obtaining a first performance parameter of the first heat exchanger in a boundary state according to the first characteristic parameter, and obtaining a second performance parameter of the second heat exchanger in the boundary state according to the second characteristic parameter;
obtaining a performance parameter of the air preheater according to the first performance parameter and the second performance parameter;
and determining the performance state of the air preheater according to the performance parameters of the air preheater and a preset parameter threshold.
2. The method for detecting the operation performance of the air preheater according to claim 1, wherein the obtaining a first characteristic parameter of the first heat exchanger under the test condition according to the first operation parameter comprises:
obtaining the total heat exchange quantity of the first heat exchanger according to the first operation parameter;
obtaining an inlet smoke mixing enthalpy value of the air preheater according to the first operation parameter;
obtaining an outlet flue gas temperature enthalpy value of the first heat exchanger according to the inlet flue gas mixed enthalpy value and the total heat exchange quantity of the first heat exchanger;
and obtaining a first characteristic parameter of the first heat exchanger according to the outlet flue gas temperature enthalpy value of the first heat exchanger.
3. The method for detecting the operation performance of the air preheater according to claim 1, wherein the obtaining of the second characteristic parameter of the second heat exchanger in the test state according to the second operation parameter includes:
obtaining the total heat exchange quantity of the second heat exchanger according to the second operation parameter;
obtaining the inlet smoke mixing enthalpy value of the air preheater according to the second operation parameter;
obtaining an outlet flue gas temperature enthalpy value of the second heat exchanger according to the inlet flue gas mixed enthalpy value and the total heat exchange quantity of the second heat exchanger;
and obtaining a second characteristic parameter of the second heat exchanger according to the outlet flue gas temperature enthalpy value of the second heat exchanger.
4. The method for detecting the operation performance of the air preheater according to claim 1, wherein the obtaining of the first performance parameter of the first heat exchanger in the boundary state according to the first characteristic parameter includes:
setting the air outlet temperature of the first heat exchanger in the boundary state and obtaining the air outlet enthalpy value of the first heat exchanger in the boundary state according to the air outlet temperature of the first heat exchanger in the boundary state;
obtaining a first mixed enthalpy value of the inlet flue gas in the boundary state according to the air outlet enthalpy value of the first heat exchanger in the boundary state;
obtaining an outlet flue gas temperature enthalpy value of the first heat exchanger in the boundary state according to the first mixed enthalpy value of the inlet flue gas in the boundary state;
obtaining a first characteristic parameter of the first heat exchanger in a boundary state according to the first characteristic parameter;
obtaining a first heat exchange quantity parameter of the first heat exchanger according to the first characteristic parameter of the first heat exchanger in the boundary state and the outlet flue gas temperature enthalpy value of the first heat exchanger in the boundary state;
if the first heat exchange quantity parameter meets a first preset heat exchange quantity condition, taking the air outlet temperature of the first heat exchanger in the boundary state as a first performance parameter of the first heat exchanger;
and if the first heat exchange quantity parameter does not meet the first preset heat exchange quantity condition, returning to the step of executing the air outlet temperature of the first heat exchanger in the set boundary state and obtaining the air outlet enthalpy value of the first heat exchanger in the boundary state according to the air outlet temperature of the first heat exchanger in the boundary state.
5. The method for detecting the operation performance of the air preheater according to claim 1, wherein the obtaining of the second performance parameter of the second heat exchanger in the boundary state according to the second characteristic parameter includes:
setting the air outlet temperature of the second heat exchanger in the boundary state and obtaining the air outlet enthalpy value of the second heat exchanger in the boundary state according to the air outlet temperature of the second heat exchanger in the boundary state;
obtaining a second mixed enthalpy value of the inlet flue gas in the boundary state according to the air outlet enthalpy value of the second heat exchanger in the boundary state;
obtaining the outlet flue gas temperature of the second heat exchanger in the boundary state according to the second mixed enthalpy value of the inlet flue gas in the boundary state;
obtaining a second characteristic parameter of the second heat exchanger in a boundary state according to the second characteristic parameter;
obtaining a second heat exchange quantity parameter of the second heat exchanger according to a second characteristic parameter of the second heat exchanger in the boundary state and the outlet flue gas temperature of the second heat exchanger in the boundary state;
if the second heat exchange quantity parameter meets a second preset heat exchange quantity condition, taking the air outlet temperature of the second heat exchanger in the boundary state as a second performance parameter of the second heat exchanger;
and if the second heat exchange quantity parameter does not meet a second preset heat exchange quantity condition, returning to the step of executing the air outlet temperature of the second heat exchanger in the set boundary state and obtaining the air outlet enthalpy value of the second heat exchanger in the boundary state according to the air outlet temperature of the second heat exchanger in the boundary state.
6. The method for detecting the operation performance of the air pre-heater according to claim 4 or 5, wherein obtaining the performance parameter of the air pre-heater according to the first performance parameter and the second performance parameter comprises:
and obtaining the smoke exhaust temperature of the air preheater according to the air outlet temperature of the first heat exchanger in the boundary state and the air outlet temperature of the second heat exchanger in the boundary state.
7. The method for detecting the operation performance of the air pre-heater according to claim 1, wherein the determining the performance state of the air pre-heater according to the performance parameter of the air pre-heater and a preset parameter threshold comprises:
if the performance parameter of the air preheater is larger than the preset parameter threshold, determining that the performance state of the air preheater is poor;
and if the performance parameter of the air preheater is less than or equal to the preset parameter threshold, determining that the performance state of the air preheater is good.
8. An air preheater operation performance detection device, characterized by comprising:
the model conversion module is used for simplifying the air preheater into a first heat exchanger and a second heat exchanger based on an air preheater theoretical simplification model; the first heat exchanger is a heat exchanger of primary air and flue gas, the second heat exchanger is a heat exchanger of secondary air and flue gas, and the flue gas at the outlets of the first heat exchanger and the second heat exchanger is mixed to discharge smoke at the outlet of the air preheater;
the parameter acquisition module is used for acquiring a first operating parameter of the first heat exchanger and a second operating parameter of the second heat exchanger;
the characteristic parameter acquisition module is used for acquiring a first characteristic parameter of the first heat exchanger in a test state according to the first operation parameter and acquiring a second characteristic parameter of the second heat exchanger in the test state according to the second operation parameter;
the performance parameter acquisition module is used for acquiring a first performance parameter of the first heat exchanger in a boundary state according to the first characteristic parameter and acquiring a second performance parameter of the second heat exchanger in the boundary state according to the second characteristic parameter;
the performance parameter determining module is used for obtaining the performance parameters of the air preheater according to the first performance parameters and the second performance parameters;
and the performance state determining module is used for determining the performance state of the air preheater according to the performance parameters of the air preheater and a preset parameter threshold.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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| CN112082786B (en) * | 2020-07-20 | 2022-07-22 | 国网河北省电力有限公司电力科学研究院 | Method and device for predicting normal operation performance of air preheater of generator set |
| CN112113204B (en) * | 2020-08-14 | 2022-05-03 | 中国神华能源股份有限公司国华电力分公司 | Temperature control method and device of air preheater and electronic equipment |
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