CN112066356A - Boiler thermal efficiency online monitoring method and device, readable medium and electronic equipment - Google Patents
Boiler thermal efficiency online monitoring method and device, readable medium and electronic equipment Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000012544 monitoring process Methods 0.000 title claims abstract description 11
- 238000004364 calculation method Methods 0.000 claims abstract description 87
- 239000000779 smoke Substances 0.000 claims abstract description 38
- 239000007789 gas Substances 0.000 claims description 92
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 25
- 239000001301 oxygen Substances 0.000 claims description 25
- 229910052760 oxygen Inorganic materials 0.000 claims description 25
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 13
- 239000003546 flue gas Substances 0.000 claims description 13
- 238000012806 monitoring device Methods 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000004590 computer program Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012549 training Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/18—Applications of computers to steam boiler control
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- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
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Abstract
The invention discloses a boiler thermal efficiency on-line monitoring method, a device, a readable medium and electronic equipment, wherein the method comprises the following steps: acquiring the current exhaust gas temperature when the gas boiler operates and the current excess air coefficient at the exhaust gas position; acquiring a boiler thermal efficiency calculation formula of the gas boiler, wherein the boiler thermal efficiency calculation formula is constructed on the basis of an efficiency constant, a product term of a smoke exhaust temperature parameter and a smoke exhaust temperature variable, and a product term of an excess air coefficient parameter and an excess air coefficient variable; and substituting the current exhaust gas temperature and the current excess air coefficient into a boiler thermal efficiency calculation formula for calculation so as to determine the current boiler thermal efficiency of the gas-fired boiler. According to the technical scheme, the boiler thermal efficiency of the gas boiler can be calculated only by acquiring the exhaust gas temperature and the excess air coefficient at the exhaust gas position when the gas boiler operates and bringing the exhaust gas temperature and the excess air coefficient into the boiler thermal efficiency calculation formula, so that the calculation difficulty is reduced, the calculation time is saved, and the operation state of the gas boiler can be known in real time.
Description
Technical Field
The invention relates to the technical field of energy, in particular to a boiler thermal efficiency online monitoring method, a boiler thermal efficiency online monitoring device, a readable medium and electronic equipment.
Background
The main basis of the method for calculating the reverse equilibrium thermal efficiency of the boiler is GB/T10180 and 2017 Industrial boiler thermal performance test regulations. The formula for calculating the reverse equilibrium thermal efficiency in the industrial boiler thermal performance test procedure is eta-100- (q)2+q3+q4+q5+q6+q7) Wherein eta represents the reverse equilibrium thermal efficiency and has a unit of percent; q. q.s2Characterizing the heat loss of the exhaust smoke in unit of%; q. q.s3Characterization of gas incomplete Combustion Heat lossIn units%; q. q.s4Characterizing the heat loss of incomplete combustion of the solid in units of%; q. q.s5Characterizing the heat dissipation loss in units; q. q.s6Representing the physical heat loss of ash, and the unit is%; q. q.s7Limestone desulfurization heat loss is characterized in units of%. And for a gas boiler, q4、q6、q7All are 0, so the formula for calculating the inverse equilibrium thermal efficiency of the gas boiler is that eta is 100- (q)2+q3+q5)。
However, the thermal efficiency of the boiler determined by the method needs to acquire more test data and more test instrument equipment, so that more accurate heat loss q of exhaust smoke can be obtained2Heat loss due to incomplete combustion of gas q3And heat dissipation loss q5Meanwhile, the calculation process is relatively complex, the calculation time is long, and the real-time understanding of the operation state of the gas boiler is not facilitated.
Disclosure of Invention
The invention provides a boiler thermal efficiency on-line monitoring method, a device, a computer readable storage medium and electronic equipment, which can calculate the boiler thermal efficiency of a gas boiler only by acquiring the exhaust gas temperature and the excess air coefficient at the exhaust gas position when the gas boiler operates and bringing the exhaust gas temperature and the excess air coefficient into a boiler thermal efficiency calculation formula, thereby reducing the calculation difficulty, saving the calculation time and facilitating the real-time understanding of the operating state of the gas boiler.
In a first aspect, the present invention provides an online monitoring method for boiler thermal efficiency, comprising:
acquiring the current exhaust gas temperature when the gas boiler operates and the current excess air coefficient at the exhaust gas position;
acquiring a boiler thermal efficiency calculation formula of the gas boiler, wherein the boiler thermal efficiency calculation formula is constructed on the basis of an efficiency constant, a product term of a smoke discharge temperature parameter and a smoke discharge temperature variable, and a product term of an excess air coefficient parameter and an excess air coefficient variable;
and substituting the current exhaust gas temperature and the current excess air coefficient into the boiler thermal efficiency calculation formula for calculation so as to determine the current boiler thermal efficiency of the gas-fired boiler.
In one embodiment, the boiler thermal efficiency calculation formula includes:
η＝103.862-4.867×α-0.053×t
wherein eta represents the thermal efficiency of the boiler and has a unit of percent; 103.862 characterize the efficiency constant; 4.867 characterizing the excess air factor parameter; 0.053 represents a smoke exhaust temperature parameter; alpha represents the excess air coefficient at the smoke exhaust; t represents the flue gas temperature in degrees Celsius.
In one embodiment, said obtaining a current excess air ratio at the flue gas when the gas boiler is operating comprises:
acquiring the current oxygen content of the smoke exhaust part when the gas-fired boiler operates;
acquiring an excess air coefficient calculation formula;
and substituting the current oxygen content into the excess air coefficient calculation formula for calculation so as to determine the current excess air coefficient.
In one embodiment, the excess air ratio calculation is as follows:
α＝(21/(21-O2))
wherein alpha represents the excess air coefficient at the exhaust; o is2The oxygen content in% of the exhaust gas is shown.
In one embodiment, the excess air ratio calculation is as follows:
α＝(21/(21-0.91×O2))
wherein alpha represents the excess air coefficient at the exhaust; o is2The oxygen content in% of the exhaust gas is shown.
In a second aspect, the present invention provides an online monitoring device for thermal efficiency of a boiler, comprising:
the parameter acquisition module is used for acquiring the current exhaust gas temperature when the gas boiler operates and the current excess air coefficient at the exhaust gas position;
the formula obtaining module is used for obtaining a boiler thermal efficiency calculation formula of the gas-fired boiler, and the boiler thermal efficiency calculation formula is constructed on the basis of an efficiency constant, a product term of a smoke exhaust temperature parameter and a smoke exhaust temperature variable and a product term of an excess air coefficient parameter and an excess air coefficient variable;
and the calculation module is used for substituting the current exhaust gas temperature and the current excess air coefficient into the boiler thermal efficiency calculation formula for calculation so as to determine the current boiler thermal efficiency of the gas-fired boiler.
In one embodiment, the boiler thermal efficiency calculation formula includes:
η＝103.862-4.867×α-0.053×t
wherein eta represents the thermal efficiency of the boiler and has a unit of percent; 103.862 characterize the efficiency constant; 4.867 characterizing the excess air factor parameter; 0.053 represents a smoke exhaust temperature parameter; alpha represents the excess air coefficient at the smoke exhaust; t represents the flue gas temperature in degrees Celsius.
In one embodiment, the parameter obtaining module includes: the oxygen content acquisition unit, the formula acquisition unit and the calculation unit; wherein the content of the first and second substances,
the oxygen content obtaining unit is used for obtaining the current exhaust gas temperature when the gas boiler operates and the current excess air coefficient at the exhaust gas position;
the formula obtaining unit is used for obtaining a boiler thermal efficiency calculation formula of the gas-fired boiler;
and the calculation unit is used for substituting the current exhaust gas temperature and the current excess air coefficient into the boiler thermal efficiency calculation formula for calculation so as to determine the current boiler thermal efficiency of the gas-fired boiler.
In a third aspect, the invention provides a computer-readable storage medium comprising executable instructions which, when executed by a processor of an electronic device, cause the processor to perform the method according to any one of the first aspect.
In a fourth aspect, the present invention provides an electronic device, comprising a processor and a memory storing execution instructions, wherein when the processor executes the execution instructions stored in the memory, the processor performs the method according to any one of the first aspect.
The invention provides a method and a device for monitoring the thermal efficiency of a boiler on line, a computer readable storage medium and electronic equipment, wherein the method comprises the steps of obtaining the current exhaust gas temperature when a gas boiler operates and the current excess air coefficient at the exhaust gas position; then, a boiler thermal efficiency calculation formula of the gas boiler is obtained, the boiler thermal efficiency calculation formula is constructed based on an efficiency constant, a product term of a smoke discharge temperature parameter and a smoke discharge temperature variable, and a product term of an excess air coefficient parameter and an excess air coefficient variable, and then the current smoke discharge temperature and the current excess air coefficient are substituted into the boiler thermal efficiency calculation formula for calculation so as to determine the current boiler thermal efficiency of the gas boiler. In summary, according to the technical scheme of the invention, the boiler thermal efficiency of the gas boiler can be calculated only by acquiring the exhaust gas temperature and the excess air coefficient at the exhaust gas position when the gas boiler operates and bringing the exhaust gas temperature and the excess air coefficient into the boiler thermal efficiency calculation formula, so that the calculation difficulty is reduced, the calculation time is saved, and the operation state of the gas boiler can be known in real time.
Further effects of the above-mentioned unconventional preferred modes will be described below in conjunction with specific embodiments.
Drawings
In order to more clearly illustrate the embodiments or the prior art solutions of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a schematic flow chart of a method for on-line monitoring of thermal efficiency of a boiler according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an on-line monitoring device for thermal efficiency of a boiler according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another online monitoring device for thermal efficiency of a boiler according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail and completely with reference to the following embodiments and accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
The embodiment of the invention can be applied to electronic equipment, particularly to a server or a general computer, and as shown in fig. 1, the embodiment of the invention provides an online monitoring method for the thermal efficiency of a boiler, which comprises the following steps:
The sensor is installed on the gas boiler, and data collected by the sensor is sent to the electronic equipment, so that the electronic equipment can acquire the operating parameters of the gas boiler during operation. Here, it is prior art to collect data based on the sensor, and the implementation of the present invention is not described in too much detail.
Specifically, the operation parameters of the gas-fired boiler include two types, one is the temperature of the exhaust smoke and the oxygen content at the exhaust smoke; the other is the flue gas temperature and the excess air ratio.
When the operation parameters comprise the smoke exhaust temperature and the excess air coefficient, the current smoke exhaust temperature and the current excess air coefficient at the smoke exhaust position when the gas boiler operates can be directly obtained through a sensor arranged on the gas boiler.
When the operating parameters include the exhaust gas temperature and the oxygen content at the exhaust gas, in one embodiment, the excess air ratio may be determined specifically by:
acquiring the current oxygen content of the exhaust smoke when the gas boiler operates; acquiring an excess air coefficient calculation formula; and substituting the current oxygen content into an excess air coefficient calculation formula for calculation so as to determine the current excess air coefficient.
Specifically, the current oxygen content of the exhaust smoke of the gas boiler during operation can be directly obtained through a sensor installed on the gas boiler.
In one embodiment, the excess air ratio calculation formula includes:
α＝(21/(21-O2))
wherein alpha represents the excess air coefficient at the exhaust; o is2The oxygen content in% of the exhaust gas is shown.
In one embodiment, the excess air ratio calculation formula includes:
α＝(21/(21-0.91×O2))
wherein alpha represents the excess air coefficient at the exhaust; o is2The oxygen content in% of the exhaust gas is shown.
It should be noted that, the embodiment of the present invention is not intended to limit the manner in which the excess air ratio calculation formula is obtained, and may be obtained by performing model training between the oxygen content of the flue gas of the gas boiler and the excess air ratio.
And 102, acquiring a boiler thermal efficiency calculation formula of the gas-fired boiler, wherein the boiler thermal efficiency calculation formula is constructed on the basis of an efficiency constant, a product term of a smoke exhaust temperature parameter and a smoke exhaust temperature variable, and a product term of an excess air coefficient parameter and an excess air coefficient variable.
In one embodiment, the boiler thermal efficiency calculation formula includes:
η＝103.862-4.867×α-0.053×t
wherein eta represents the thermal efficiency of the boiler and has a unit of percent; 103.862 characterize the efficiency constant; 4.867 characterizing the excess air factor parameter; 0.053 represents a smoke exhaust temperature parameter; alpha represents the excess air coefficient at the smoke exhaust; t represents the flue gas temperature in degrees Celsius.
It should be noted that the flue gas temperature parameter, the excess air coefficient parameter and the efficiency constant can be continuously adjusted by combining with actual data, so that the current operation state of the gas-fired boiler can be more truly reflected.
And 103, substituting the current exhaust gas temperature and the current excess air coefficient into the boiler thermal efficiency calculation formula for calculation so as to determine the current boiler thermal efficiency of the gas-fired boiler.
The inventor compares the calculated value of the boiler thermal efficiency calculation formula eta of 103.862-4.867 x alpha-0.053 x t with the actual value of the boiler thermal efficiency, and the comparison result is shown in table 1, the deviation is at most 1.86%, the actual precision requirement of engineering can be met, and the inventor proves that the boiler thermal efficiency calculation formula eta of 103.862-4.867 x alpha-0.053 x t provided by the embodiment of the invention has good applicability.
| Serial number | Exhaust gas temperature | Oxygen content in exhaust gas | Coefficient of excess air | Actual value | Calculated value | Deviation of |
| 1 | 164.8 | 4.2 | 1.22 | 88.42 | 89.18 | 0.85 |
| 2 | 138.8 | 4.2 | 1.22 | 90.46 | 90.56 | 0.11 |
| 3 | 223.9 | 4.89 | 1.27 | 85.97 | 85.82 | -0.18 |
| 4 | 192.4 | 4.6 | 1.25 | 87.57 | 87.59 | 0.02 |
| 5 | 147.9 | 12.3 | 2.14 | 84.01 | 85.60 | 1.86 |
| 6 | 188.1 | 2.01 | 1.10 | 88.04 | 88.56 | 0.59 |
| 7 | 197.2 | 1.19 | 1.05 | 88.32 | 88.28 | -0.05 |
| 8 | 105.9 | 9.38 | 1.68 | 90.09 | 90.05 | -0.05 |
| 9 | 202.6 | 1.21 | 1.06 | 88.06 | 87.99 | -0.08 |
| 10 | 153.43 | 1 | 89.58 | 90.86 | 1.41 | |
| 11 | 150.94 | 2.15 | 84.41 | 85.40 | 1.16 | |
| 12 | 202.48 | 1.17 | 88.45 | 87.44 | -1.16 | |
| 13 | 189.03 | 1.28 | 86.74 | 87.61 | 1.00 | |
| 14 | 174.58 | 2.76 | 82.36 | 81.18 | -1.46 | |
| 15 | 50.5 | 2.2 | 1.11 | 94.36 | 95.81 | 1.51 |
| 16 | 111.5 | 9.7 | 1.73 | 89.48 | 89.56 | 0.09 |
| 17 | 128.9 | 1 | 1.05 | 91.52 | 91.94 | 0.46 |
| 18 | 128 | 6.4 | 1.38 | 90.39 | 90.34 | -0.05 |
| 19 | 103.6 | 3.9 | 1.20 | 93.97 | 92.51 | -1.57 |
According to the technical scheme, the beneficial effects of the embodiment are as follows: the boiler thermal efficiency of the gas boiler can be calculated only by acquiring the exhaust gas temperature and the excess air coefficient at the exhaust gas position when the gas boiler operates and bringing the exhaust gas temperature and the excess air coefficient into a boiler thermal efficiency calculation formula, so that the calculation difficulty is reduced, the calculation time is saved, and the operation state of the gas boiler can be known in real time.
Referring to fig. 2, based on the same concept as the method embodiment of the present invention, an embodiment of the present invention further provides an online monitoring device for boiler thermal efficiency, including:
a parameter obtaining module 201, configured to obtain a current exhaust gas temperature when the gas boiler operates and a current excess air coefficient at an exhaust gas location;
a formula obtaining module 202, configured to obtain a boiler thermal efficiency calculation formula of the gas boiler, where the boiler thermal efficiency calculation formula is constructed based on an efficiency constant, a product term of a flue gas temperature parameter and a flue gas temperature variable, and a product term of an excess air coefficient parameter and an excess air coefficient variable;
a calculating module 203, configured to substitute the current exhaust gas temperature and the current excess air coefficient into the boiler thermal efficiency calculation formula to perform calculation, so as to determine a current boiler thermal efficiency of the gas boiler.
In one embodiment, the boiler thermal efficiency calculation formula includes:
η＝103.862-4.867×α-0.053×t
wherein eta represents the thermal efficiency of the boiler and has a unit of percent; 103.862 characterize the efficiency constant; 4.867 characterizing the excess air factor parameter; 0.053 represents a smoke exhaust temperature parameter; alpha represents the excess air coefficient at the smoke exhaust; t represents the flue gas temperature in degrees Celsius.
Referring to fig. 3, in an embodiment, the parameter obtaining module 201 includes: an oxygen content obtaining unit 2011, a formula obtaining unit 2012 and a calculating unit 2013; wherein the content of the first and second substances,
the oxygen content obtaining unit 2011 is configured to obtain a current exhaust gas temperature when the gas boiler operates and a current excess air coefficient at an exhaust gas location;
the formula obtaining unit 2012 is configured to obtain a boiler thermal efficiency calculation formula of the gas boiler;
the calculating unit 2013 is configured to substitute the current exhaust gas temperature and the current excess air coefficient into the boiler thermal efficiency calculation formula to perform calculation, so as to determine the current boiler thermal efficiency of the gas boiler.
In one embodiment, the excess air ratio calculation formula includes:
α＝(21/(21-O2))
wherein alpha represents the excess air coefficient at the exhaust; o is2The oxygen content in% of the exhaust gas is shown.
In one embodiment, the excess air ratio calculation formula includes:
α＝(21/(21-0.91×O2))
wherein alpha represents the excess air coefficient at the exhaust; o is2The oxygen content in% of the exhaust gas is shown.
Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. On the hardware level, the electronic device includes a processor 401 and a memory 402 storing instructions for execution, and in one embodiment includes an internal bus 403 and a network interface 404. The Memory 402 may include a Memory 4021, such as a Random-Access Memory (RAM), and may further include a non-volatile Memory 4022 (e.g., at least 1 disk Memory); the processor 401, the network interface 404, and the memory 402 may be connected to each other by an internal bus 403, and the internal bus 403 may be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like; the internal bus 403 may be divided into an address bus, a data bus, a control bus, etc., which is indicated by only one double-headed arrow in fig. 4 for convenience of illustration, but does not indicate only one bus or one type of bus. Of course, the electronic device may also include hardware required for other services. When the processor 401 executes execution instructions stored by the memory 402, the processor 401 performs the method in any of the embodiments of the present invention and at least is used to perform the method as shown in fig. 1.
In a possible implementation mode, the processor reads the corresponding execution instruction from the nonvolatile memory into the memory and then runs the corresponding execution instruction, and the corresponding execution instruction can also be obtained from other equipment, so that the on-line monitoring device for the boiler thermal efficiency is formed on a logic level. The processor executes the execution instructions stored in the memory, so that the online monitoring method for the thermal efficiency of the boiler provided by any embodiment of the invention is realized through the executed execution instructions.
The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also 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. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
Embodiments of the present invention further provide a computer-readable storage medium, which includes an execution instruction, and when a processor of an electronic device executes the execution instruction, the processor executes a method provided in any one of the embodiments of the present invention. The electronic device may specifically be the electronic device shown in fig. 4; the execution instruction is a computer program corresponding to the boiler thermal efficiency on-line monitoring device.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects.
The embodiments of the present invention are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. An on-line monitoring method for boiler thermal efficiency is characterized by comprising the following steps:
acquiring the current exhaust gas temperature when the gas boiler operates and the current excess air coefficient at the exhaust gas position;
acquiring a boiler thermal efficiency calculation formula of the gas boiler, wherein the boiler thermal efficiency calculation formula is constructed on the basis of an efficiency constant, a product term of a smoke discharge temperature parameter and a smoke discharge temperature variable, and a product term of an excess air coefficient parameter and an excess air coefficient variable;
and substituting the current exhaust gas temperature and the current excess air coefficient into the boiler thermal efficiency calculation formula for calculation so as to determine the current boiler thermal efficiency of the gas-fired boiler.
2. The method of claim 1, wherein the boiler thermal efficiency calculation formula comprises:
η＝103.862-4.867×α-0.053×t
wherein eta represents the thermal efficiency of the boiler and has a unit of percent; 103.862 characterize the efficiency constant; 4.867 characterizing the excess air factor parameter; 0.053 represents a smoke exhaust temperature parameter; alpha represents the excess air coefficient at the smoke exhaust; t represents the flue gas temperature in degrees Celsius.
3. The method of claim 2, wherein said obtaining a current excess air factor at the flue gas when the gas boiler is operating comprises:
acquiring the current oxygen content of the smoke exhaust part when the gas-fired boiler operates;
acquiring an excess air coefficient calculation formula;
and substituting the current oxygen content into the excess air coefficient calculation formula for calculation so as to determine the current excess air coefficient.
4. The method of claim 3, wherein the excess air factor calculation formula comprises:
α＝(21/(21-O2))
wherein alpha represents the excess air coefficient at the exhaust; o is2The oxygen content in% of the exhaust gas is shown.
5. The method of claim 3, wherein the excess air factor calculation formula comprises:
α＝(21/(21-0.91×O2))
wherein alpha represents the excess air coefficient at the exhaust; o is2The oxygen content in% of the exhaust gas is shown.
6. An on-line monitoring device for boiler thermal efficiency is characterized by comprising:
the parameter acquisition module is used for acquiring the current exhaust gas temperature when the gas boiler operates and the current excess air coefficient at the exhaust gas position;
the formula obtaining module is used for obtaining a boiler thermal efficiency calculation formula of the gas-fired boiler, and the boiler thermal efficiency calculation formula is constructed on the basis of an efficiency constant, a product term of a smoke exhaust temperature parameter and a smoke exhaust temperature variable and a product term of an excess air coefficient parameter and an excess air coefficient variable;
and the calculation module is used for substituting the current exhaust gas temperature and the current excess air coefficient into the boiler thermal efficiency calculation formula for calculation so as to determine the current boiler thermal efficiency of the gas-fired boiler.
7. The apparatus of claim 6, wherein the boiler thermal efficiency calculation formula comprises:
η＝103.862-4.867×α-0.053×t
wherein eta represents the thermal efficiency of the boiler and has a unit of percent; 103.862 characterize the efficiency constant; 4.867 characterizing the excess air factor parameter; 0.053 represents a smoke exhaust temperature parameter; alpha represents the excess air coefficient at the smoke exhaust; t represents the flue gas temperature in degrees Celsius.
8. The apparatus of claim 6, wherein the parameter obtaining module comprises: the oxygen content acquisition unit, the formula acquisition unit and the calculation unit; wherein the content of the first and second substances,
the oxygen content obtaining unit is used for obtaining the current exhaust gas temperature when the gas boiler operates and the current excess air coefficient at the exhaust gas position;
the formula obtaining unit is used for obtaining a boiler thermal efficiency calculation formula of the gas-fired boiler;
and the calculation unit is used for substituting the current exhaust gas temperature and the current excess air coefficient into the boiler thermal efficiency calculation formula for calculation so as to determine the current boiler thermal efficiency of the gas-fired boiler.
9. A computer-readable storage medium comprising executable instructions that, when executed by a processor of an electronic device, cause the processor to perform the method of any of claims 1 to 5.
10. An electronic device comprising a processor and a memory storing execution instructions, the processor performing the method of any of claims 1-5 when the processor executes the execution instructions stored by the memory.
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| CN112834560A (en) * | 2020-12-31 | 2021-05-25 | 新奥数能科技有限公司 | Method, system and device for testing counter-balance thermal efficiency of gas industrial boiler |
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