CN114459787B - Method, system and device for rapidly testing thermal efficiency of industrial boiler - Google Patents
Method, system and device for rapidly testing thermal efficiency of industrial boiler Download PDFInfo
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Abstract
The invention provides a method, a system and a device for rapidly testing the heat efficiency of an industrial boiler. The invention is characterized in thatThe testing method comprises the steps of selecting a furnace type and a fuel type of a boiler; filling in the designed evaporation capacity Dsc and the actual evaporation capacity Ded of the boiler; measuring the exhaust gas temperature t of a boiler py Oxygen content O 2 Temperature t of cold air entering furnace 1k The method comprises the steps of carrying out a first treatment on the surface of the Calculating smoke discharging heat loss q2, searching chemical incomplete combustion heat loss q3, searching solid incomplete combustion heat loss q4, calculating heat dissipation loss q5 and searching ash physical heat loss q6, and calculating the heat efficiency eta of the boiler through counter balance; shows the boiler heat efficiency eta, the exhaust gas temperature tpy and the excess air coefficient alpha py . According to the invention, by reducing the measurement parameters, simplifying the test method, increasing the biomass boiler data, finally achieving the purpose of covering wider boiler types, shortening the test time, reducing the test cost and rapidly judging the thermal efficiency of the boiler.
Description
Technical Field
The invention relates to the crossing field of thermal technology and computer technology, in particular to a method, a system and a device for rapidly testing the thermal efficiency of an industrial boiler.
Background
The industrial boiler thermal efficiency test is a technical means for monitoring the thermal efficiency condition of the boiler, and relates to specific energy-saving and emission-reduction indexes. Industrial boiler thermal efficiency test according to the existing test technical specification TSG G0003-2010 industrial boiler energy efficiency test and evaluation rule (hereinafter referred to as rule), measurement (assay) is required: the composition, heating value, and ash content of the fuel; slag combustible content; the combustible content of the fly ash; water feed flow, temperature, pressure; steam flow, temperature, pressure; smoke exhaust components, temperature and the like, long detection and assay period, data lag and high test cost, are not beneficial to the rapid judgment of boiler use units on the thermal efficiency of the boiler and are not beneficial to the rapid judgment of energy-saving monitoring mechanism sites.
Because of the requirements of carbon emission control policies, many industrial boilers are changed from coal to biomass-fired boilers, and the related calculation coefficients of biomass fuels are not set in the rules, so that the thermal efficiency test of the biomass boilers can only refer to the data of the coal-fired boilers, and larger errors exist.
The testing method of the rule has long period and high testing cost, and has the defect of data in the field of biomass boilers, so that a user and a monitoring mechanism lack of thermal efficiency data support in the management of the boilers. Therefore, a rapid industrial boiler thermal efficiency test method, system and device are needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a method, a system and a device for rapidly testing the thermal efficiency of an industrial boiler, which are used for rapidly testing the thermal efficiency of the industrial boiler within the allowable error range so as to solve the problems of multiple measurement parameters, long detection period, lag assay and high test cost in the prior art, and are beneficial to the adjustment and monitoring of the thermal efficiency of the boiler by a boiler using unit and the rapid judgment of an energy-saving monitoring mechanism on site.
In one aspect, the invention provides a method for rapidly testing the thermal efficiency of an industrial boiler, comprising the following steps:
selecting the type and the type of fuel of the boiler;
filling in the designed evaporation capacity Dsc and the actual evaporation capacity Ded of the boiler;
measuring the exhaust gas temperature t of a boiler py Oxygen content O 2 Temperature t of cold air entering furnace 1k ；
Calculating smoke discharging heat loss q2, searching chemical incomplete combustion heat loss q3, searching solid incomplete combustion heat loss q4, calculating heat dissipation loss q5 and searching ash physical heat loss q6, and calculating the heat efficiency eta of the boiler through counter balance;
displaying the thermal efficiency eta and the exhaust gas temperature t of the boiler py Air excess coefficient alpha py 。
Further, in the step of selecting the type and kind of fuel of the boiler,
a boiler furnace comprising: the boiler comprises a reciprocating grate A1, a chain grate A2, a coal thrower grate A3, a fluidized bed A4, a coal dust furnace A5, a coal water slurry A6, a fixed grate A7 and an oil and gas furnace A8, wherein only one boiler can be selected for a tested boiler;
a fuel type comprising: bark D1, bagasse D2, firewood D3, biomass particles D4, lignite D5, bituminous coal D6, anthracite coal D7, gas D8 and fuel D9, and only one fuel can be selected for the fuel used in the test site.
Further, in the step of filling in the designed evaporation capacity Dsc and the actual evaporation capacity Ded of the boiler, the designed evaporation capacity Dsc is a factory design value of the boiler; the actual evaporation Ded is the actual evaporation at the time of the measurement site, measured by a steam flow meter, or converted to a feed water flow, or process usage steam statistics.
Further, the exhaust gas temperature t of the boiler is measured py Oxygen content O 2 Temperature t of cold air entering furnace 1k In the step (a), before measuring the flue gas temperature, the temperature t of the cold air entering the boiler is measured at the inlet of the boiler blower 1k The method comprises the steps of carrying out a first treatment on the surface of the If there is no blower, the temperature t of the cold air entering the furnace is measured before the furnace door 1k The method comprises the steps of carrying out a first treatment on the surface of the Measuring the percentage content of oxygen gas in the flue gas to obtain the oxygen content O 2 。
Further, in the step of calculating the heat loss q2 of the exhaust gas, the calculation is performed according to formula 1.
q 2 ＝0.01Kα py (t py -t lk ) (1)
Wherein the excess air is alpha py The number is calculated according to formula 2; k is a coefficient selected according to the kind of raw materials and is selected according to Table 1.
TABLE 1 coefficient k value
Further, in the step of retrieving the chemical incomplete combustion heat loss q3, q3 is selected as a value according to table 2.
TABLE 2 chemical incomplete combustion Heat loss q3
Further, in the step of taking the solid incomplete combustion heat loss q4, q4 is selected as a value according to table 3.
TABLE 3 q4 values of solid incomplete combustion heat loss
Further, in the step of calculating the heat dissipation loss q 5:
when the actual output of the boiler is not lower than 75%, selecting according to q5=q5ed in table 4;
the actual output of the boiler is lower than 75 percent, and is corrected according to the formula 3:
table 4 Heat dissipation loss q5 for boiler rated output
Further, the physical heat loss q6, q6 of the ash is checked, and the values are selected according to Table 5.
Table 4 Heat dissipation loss q5 for boiler rated output
Further, in the step of calculating the boiler heat efficiency η, the calculation is performed according to the formula 4:
η＝100-(q 2 +q 3 +q 4 +q 5 +q 6 ) (4)
on the other hand, the invention also provides a rapid test system for the thermal efficiency of the industrial boiler, which comprises the following components:
the option module is used for selecting the type and the type of fuel of the boiler;
the filling module is used for filling the designed evaporation capacity Dsc and the actual evaporation capacity Ded of the boiler;
the test module is used for measuring the exhaust gas temperature t py Oxygen content O 2 Temperature t of cold air entering furnace 1k ；
The calculation module is used for calculating the smoke discharging heat loss q2, the chemical incomplete combustion heat loss q3, the solid incomplete combustion heat loss q4, the heat dissipation loss q5 and the ash physical heat loss q6, and calculating the heat efficiency eta of the boiler through counter balance;
the display module is used for displaying the thermal efficiency eta and the exhaust gas temperature t of the boiler py Air excess coefficient alpha py 。
Finally, the invention also provides a device for rapidly testing the thermal efficiency of the industrial boiler, which comprises: the device comprises a display screen, a host, a data line, an oxygen sensor and a temperature sensor, wherein the display screen is arranged on the host; the oxygen sensor and the temperature sensor are connected with the host through data lines;
the display screen is used for selecting the type and the type of the fuel of the boiler; filling in the designed evaporation capacity Dsc and the actual evaporation capacity Ded of the boiler; displaying the thermal efficiency eta and the exhaust gas temperature t of the boiler py Air excess coefficient alpha py ；
The host is used for calculating smoke discharging heat loss q2, searching chemical incomplete combustion heat loss q3, searching solid incomplete combustion heat loss q4, calculating heat dissipation loss q5 and searching ash physical heat loss q6, and calculating the heat efficiency eta of the boiler through counter balance;
the data line is used for transmitting data acquired by the oxygen sensor and the temperature sensor to the host;
the oxygen sensor is used for collecting the oxygen content O of the boiler 2 ；
The temperature sensor is used for collecting the exhaust gas temperature t of the boiler p y, temperature t of cold air entering furnace 1k 。
The beneficial effects of the invention are as follows: according to the rapid test method, system and device for the thermal efficiency of the industrial boiler, provided by the invention, only 3 parameters including the temperature of cold air entering the boiler, the oxygen content of flue gas and the temperature of discharged smoke are measured, the number of measured parameters is reduced, the biomass fuel options are increased, the test method of 'rule' is simplified, the biomass boiler is covered, the test cost is finally reduced, and the thermal efficiency of the boiler is rapidly judged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments 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 other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for rapidly testing the thermal efficiency of an industrial boiler according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a system for rapidly testing the thermal efficiency of an industrial boiler according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a device for rapidly testing thermal efficiency of an industrial boiler according to an embodiment of the present invention. Illustration of: 1-a display screen; 2-a host; 3-data lines; a 4-oxygen sensor; 5-a temperature sensor; 201-an option module; 202-filling a module; 203-a test module; 204-a calculation module; 205-display module.
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 clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The following describes in detail the technical solutions provided by the embodiments of the present invention with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention provides a method for rapidly testing thermal efficiency of an industrial boiler, including:
s101, selecting a furnace type and a fuel type of a boiler.
In this embodiment, the boiler type includes: the boiler comprises a reciprocating grate A1, a chain grate A2, a coal thrower grate A3, a fluidized bed A4, a coal dust furnace A5, a coal water slurry A6, a fixed grate A7 and an oil and gas furnace A8, wherein only one boiler can be selected for a tested boiler;
a fuel type comprising: bark D1, bagasse D2, firewood D3, biomass particles D4, lignite D5, bituminous coal D6, anthracite D7, gas D8 and fuel D9, and adding various biomass fuels, wherein only one fuel can be selected for the fuel used in the test site.
S102, filling in the designed evaporation capacity Dsc and the actual evaporation capacity Ded of the boiler.
In the present embodiment, the design evaporation amount Dsc is a boiler factory design value; the actual evaporation Ded is the actual evaporation at the time of the measurement site, measured by a steam flow meter, or converted to a feed water flow, or process usage steam statistics.
S103, measuring the exhaust gas temperature t of the boiler py Oxygen content O 2 Temperature t of cold air entering furnace 1k 。
In this embodiment, prior to measuring the flue gas temperature, the incoming cool air temperature t1k is measured at the boiler blower inlet; if there is no blower, the temperature t of the cold air entering the furnace is measured before the furnace door 1k The method comprises the steps of carrying out a first treatment on the surface of the Measuring the percentage content of oxygen gas in the flue gas to obtain the oxygen content O 2 。
S104, calculating smoke discharging heat loss q2, searching chemical incomplete combustion heat loss q3, searching solid incomplete combustion heat loss q4, calculating heat dissipation loss q5 and searching ash physical heat loss q6, and calculating the heat efficiency eta of the boiler through counter balance.
S105, displaying the thermal efficiency eta and the exhaust gas temperature t of the boiler py Air excess coefficient alpha py 。
The main data and the calculation data of the test are displayed through a display screenComprising: boiler thermal efficiency eta and exhaust gas temperature t py Air excess coefficient alpha py 。
Referring to fig. 2, a rapid industrial boiler thermal efficiency test system includes:
an option module 201 for selecting a boiler type and a fuel type;
a filling module 202 for filling in the designed evaporation amount Dsc and the actual evaporation amount Ded;
The calculation module 204 is used for calculating the smoke discharging heat loss q2, the chemical incomplete combustion heat loss q3, the solid incomplete combustion heat loss q4, the heat dissipation loss q5 and the ash physical heat loss q6, and calculating the boiler heat efficiency eta through counter balance;
a display module 205 for displaying the thermal efficiency eta and the exhaust gas temperature t of the boiler py Air excess coefficient alpha py 。
Referring to fig. 3, a rapid testing device for thermal efficiency of an industrial boiler includes: the device comprises a display screen 1, a host 2, a data line 3, an oxygen sensor 4 and a temperature sensor 5, wherein the display screen 1 is arranged on the host 2; the oxygen sensor 4 and the temperature sensor 5 are connected with the host 2 through a data line 3.
The display screen 1 is used for selecting the type and the type of fuel of the boiler; filling in the designed evaporation capacity Dsc and the actual evaporation capacity Ded of the boiler; displaying the thermal efficiency eta and the exhaust gas temperature t of the boiler py Air excess coefficient alpha py ；
The host machine 2 is used for calculating smoke discharging heat loss q2, searching chemical incomplete combustion heat loss q3, searching solid incomplete combustion heat loss q4, calculating heat dissipation loss q5 and searching ash physical heat loss q6, and calculating the heat efficiency eta of the boiler through counter balance;
the data line 3 is used for transmitting data acquired by the oxygen sensor 4 and the temperature sensor 5 to the host 2;
the oxygen sensor 4 is used for collecting the oxygen content O2 of the boiler;
the temperature sensor 5 is used for collecting the exhaust gas temperature t of the boiler py Temperature t of cold air entering furnace 1k 。
The invention provides a rapid testing device for the thermal efficiency of an industrial boiler, which has the following working principle: the display screen 1 and the host 2 are combined together; data collected by the oxygen sensor 4 and the temperature sensor 5 are transmitted to the host computer 2 through the data line 3. Wherein the display screen 1 has: options, filling in, display functions. The boiler type and the fuel type of the boiler are selected on the screen through the option buttons. The designed evaporation amount Dsc, the actual evaporation amount Ded are filled in on the screen by a fill button. After measurement calculation, displaying on a screen: boiler thermal efficiency eta and exhaust gas temperature t py Air excess coefficient alpha py 。
Case 1:
boiler design evaporation capacity: 4t/h, model: DZG4-1.25-M, oven type: the fire grate is fixed, and the fuel is firewood.
1. Rule measuring and heat efficiency regulating method
1. Parameters that need to be measured and assayed:
(1) Parameters to be measured: the actual evaporation capacity is 2.45t/h, and the temperature t of the cold air entering the furnace lk At 24.4 ℃ and the exhaust gas temperature t py 162.07 ℃ and flue gas O 2 13.08 percent of the content of CO in the flue gas, 0.11 percent of the content of CO in the flue gas and CO in the flue gas 2 The content is 7.90 percent, and the total content is 6 parameters;
(2) Parameters of the assay are required: the fuel received a basic low heat generation (Qnet. V. Ar) of 11390.00kJ/kg, a fly ash combustible content Cfh of 16.78, a slag combustible content Clz of 15.12, and a fuel received a basic ash Aar of 2.25 for a total of 4 parameters.
2. Boiler calculation efficiency
(1) The solid incomplete combustion heat loss q4 is calculated according to the formula (5-2) of the rule
Wherein the fuel received a base ash Aar assay value of 2.25; receiving a basic low-order heating value test value 11390.00kJ/kg; the weight percentages of the ash content of the fly ash, the coal leakage and the slag are selected according to the rules of tables 5-3 and experience (afh: alm: alz) = (40:0:60), the carbon content Cfh of the fly ash combustible is tested to be 16.78, the carbon content Clm of the coal leakage combustible is 0, and the carbon content Clz of the slag combustible is tested to be 15.12.
(2) Heat loss q2 from the exhaust gas according to the formula of rule (5-1)
Wherein the excess air ratio is calculated according to the formula of rule
m and n are calculation coefficients, m is 0.6 and n is 3.8 are obtained in table 5-1 of the rule; the temperature tlk of the cold air entering the furnace is 24.4 ℃, the temperature tpy of the discharged smoke is 162.07 ℃, and the temperature is actual measurement data.
(3) Heat loss from incomplete combustion of gas
Q3=1.0 is selected according to rule table 5-2
(4) Heat dissipation loss
The actual output of the boiler is 2.45t/h and is lower than 75% of the rated output of 4t/h, and the heat dissipation loss can be corrected according to the formula (5-3 a) by using the table 'rule' table 5-4:
(5) Physical heat loss of ash
Q6=0.078 according to rule equations 5-4
(6) Boiler thermal efficiency
According to the formula 5-4 of rule:
η＝100-(q 2 +q 3 +q 4 +q 5 +q 6 )＝78.57％
2. the invention relates to a method for measuring thermal efficiency
1. Parameters that need to be measured and assayed:
(1) Parameters to be measured: temperature t of cold air entering furnace lk At 24.4 ℃ and the exhaust gas temperature t py 162.07 degree and flue gas O 2 13.08% of content, 3 parameters in total;
(2) Parameters of the assay are required: the method is free;
2. boiler calculation efficiency
(1) Heat loss q4 from incomplete combustion of solid
Selecting by a calculation module according to table 3: q4=1.05
(2) Heat loss q2 of exhaust gas is according to formula (2)
Calculating q by a calculation module formula (1) 2 ＝0.01Kα py (t py -t lk )＝15.69
(3) Calculating chemical incomplete combustion heat loss q3
Selecting numerical values according to table 5 by a calculation module: q3=0.2
(4) Physical heat loss q6 of ash
Selecting numerical values according to table 5 by a calculation module: q6=0.5
(5) Heat dissipation loss q5
Correcting according to the formula:
(6) The total efficiency of the boiler is calculated by a calculation module according to the formula (4)
η＝100-(q 2 +q 3 +q 4 +q 5 +q 6 )＝77.19％
Table 7: case one test error comparison of the invention and rules
| Project | Rule (%) | The invention (%) | Error of |
| q2 | 14.41 | 15.94 | 1.53 |
| q3 | 1.0 | 0.5 | 0.5 |
| q4 | 1.21 | 1.05 | 0.07 |
| q5 | 4.73 | 4.73 | 0 |
| q6 | 0.078 | 0.5 | 0.5 |
| Overall efficiency | 78.57 | 77.28 | 1.29 |
The difference between the efficiency of the invention and the efficiency of the test of rule is 1.29%, and the difference between the efficiency measured by two tests conforming to the requirement of rule is not more than 2%.
Case 2:
boiler design evaporation capacity: 40t/h, model: SHX40-1.57-AI, furnace type: the fuel of the circulating fluidized bed boiler is lignite.
1. Method for measuring and calculating boiler efficiency by using rules
1. Parameters that need to be measured and assayed:
(1) Parameters to be measured: actual evaporation capacity 30086.00kg/h, furnace-entering cold air temperature t lk At 27.07 ℃ and the exhaust gas temperature t py 161.86 ℃ and flue gas O 2 13.08 percent of the content of CO in the flue gas, 0.02 percent of the content of CO in the flue gas 2 The content is 9.31 percent, and the total content is 6 parameters;
(2) Parameters of the assay are required: the fuel received a basic low heat generation (Qnet. V. Ar) of 17990.00KJ/Kg, a fly ash combustible content Cfh of 13.50, a slag combustible content Clz of 0.28, and a fuel received a basic ash Aar of 27.25 for a total of 4 parameters.
2. Boiler calculation efficiency
(1) The solid incomplete combustion heat loss q4 is calculated according to the formula (5-2) of the rule
Wherein the fuel received a base ash Aar assay of 27.25; receiving a basic low-order heating value test value 17990.00kJ/kg; the weight percentages of ash content of fly ash, coal leakage and slag are selected according to the rule of Table 5-3 (afh: alm: alz) = (50:0:50; the carbon content Cfh of the fly ash is tested to be 13.50, the carbon content of the coal leakage combustible is Clm (no, 0), and the carbon content of the slag combustible is tested to be Clz.28.
(2) Heat loss q2 from the exhaust gas according to the formula of rule (5-1)
Wherein the excess air ratio is calculated according to the formula of rule
m and n are calculation coefficients, m is 0.6 and n is 3.8 are obtained in table 5-1 of the rule; the temperature tlk of the cold air entering the furnace is 27.07 ℃, the smoke discharging temperature tpy is 161.86 ℃, and the actual measurement data are obtained.
(3) Heat loss from incomplete combustion of gas
Selected according to rule table 5-2
q3＝0.2
(4) Heat dissipation loss
The actual output of the boiler is 30086.00kg/h which is higher than 75% of rated output, the heat dissipation loss can be calculated by using the table of rules 5-4, and q 5 ＝1.05
(5) Physical heat loss of ash
Q6=0.43 according to rule formula 5-4
(6) Boiler thermal efficiency
According to the formula 5-4 of rule:
η＝100-(q 2 +q 3 +q 4 +q 5 +q 6 )＝84.84％
2. the invention relates to a method for measuring and calculating boiler efficiency
1. Parameters that need to be measured and assayed:
(1) Parameters to be measured: the temperature tlk of the cold air entering the furnace is 27.07 ℃, the smoke discharging temperature tpy is 161.86 ℃, and the content of O2 in the smoke is 13.08 percent, which is 3 parameters in total;
(2) Parameters of the assay are required: the method is free;
2. boiler calculation efficiency
(1) Heat loss q4 from incomplete combustion of solid
Selecting by a calculation module according to table 3: q4=2.52
(2) Heat loss q2 of exhaust gas is according to formula (1)
Calculating q by a calculation module 2 ＝0.01Kα py (t py -t lk )＝9.83
(3) Calculating chemical incomplete combustion heat loss q3
Selecting numerical values according to table 5 by a calculation module: q3=0.5
(4) Physical heat loss q6 of ash
Selecting numerical values according to table 5 by a calculation module: q6=0.5
(5) Heat dissipation loss q5
Selecting a value q according to table 6 by a calculation module 5 ＝1.05
The total efficiency eta of the boiler is calculated by a calculation module according to a formula (4)
η＝100-(q 2 +q 3 +q 4 +q 5 +q 6 )＝85.68％
Table 8: case two comparison of test errors of the invention and rule
| Project | Rules (% | The invention (% | Error of |
| q2 | 9.53 | 9.83 | 0.3 |
| q3 | 0.2 | 0.5 | 0.3 |
| q4 | 3.95 | 2.52 | 1.43 |
| q5 | 1.05 | 1.05 | 0 |
| q6 | 0.43 | 0.5 | 0.07 |
| Overall efficiency | 84.84 | 85.68 | 0.84 |
The difference between the efficiency of the invention and the efficiency of the test of rule is 0.84%, and the difference between the efficiency measured by two tests conforming to the requirement of rule is not more than 2%.
Table 9: the invention is compared with the workload of rule
| Project | Rules of | The invention is that |
| Number of measurement parameters | 6 | 3 |
| Number of |
4 | 0 |
| Number of |
2 | 1 |
| Test result time | Typically 3 days | Real time |
Both cases show that the measurement errors of the invention are within 2% of the requirements of rule. Compared with the method of rule, the invention reduces the workload and time cost, and displays the thermal efficiency data to the monitoring personnel in real time.
The embodiment of the invention also provides a storage medium, wherein the storage medium stores a computer program, and the computer program realizes part or all of the steps in each embodiment of the method for rapidly testing the thermal efficiency of the industrial boiler. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a Random Access Memory (RAM), or the like.
It will be apparent to those skilled in the art that the techniques of embodiments of the present invention may be implemented in software plus a necessary general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be embodied in essence or what contributes to the prior art in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the embodiments or some parts of the embodiments of the present invention.
The same or similar parts between the various embodiments in this specification are referred to each other. In particular, for an embodiment of a rapid thermal efficiency test device for an industrial boiler, since it is substantially similar to the method embodiment, the description is relatively simple, and reference should be made to the description of the method embodiment.
The embodiments of the present invention described above do not limit the scope of the present invention.
Claims (1)
1. A method for rapidly testing the thermal efficiency of an industrial boiler, comprising the steps of:
selecting the type and the type of fuel of the boiler;
filling in the designed evaporation capacity Dsc and the actual evaporation capacity Ded of the boiler;
measuring the exhaust gas temperature t of a boiler py Oxygen content O 2 Temperature t of cold air entering furnace 1k ；
Calculating smoke discharging heat loss q2, searching chemical incomplete combustion heat loss q3, searching solid incomplete combustion heat loss q4, calculating heat dissipation loss q5 and searching ash physical heat loss q6, and calculating the heat efficiency eta of the boiler through counter balance;
displaying the thermal efficiency eta and the exhaust gas temperature t of the boiler py Air excess coefficient alpha py ；
In the step of selecting the type and kind of fuel of the boiler,
a boiler furnace comprising: the boiler comprises a reciprocating grate A1, a chain grate A2, a coal thrower grate A3, a fluidized bed A4, a coal dust furnace A5, a coal water slurry A6, a fixed grate A7 and an oil and gas furnace A8, wherein only one boiler can be selected for a tested boiler;
a fuel type comprising: bark D1, bagasse D2, firewood D3, biomass particles D4, lignite D5, bituminous coal D6, anthracite coal D7, gas D8 and fuel D9, and only one fuel can be selected for the fuel used in the test site;
in the step of calculating the heat loss q2 of the discharged smoke, calculation is performed according to formula 1;
q 2 ＝0.01Kα py (t py -t lk ) (1)
wherein the excess air is alpha py The number is calculated according to formula 2; k is a coefficient selected according to the type of raw materials and is selected according to a table 1;
TABLE 1 coefficient k value
In the step of searching the chemical incomplete combustion heat loss q3, q3 is selected to be a numerical value according to the table 2;
TABLE 2 chemical incomplete combustion Heat loss q3
In the step of searching for the solid incomplete combustion heat loss q4, q4 is selected as a numerical value according to table 3;
TABLE 3 q4 values of solid incomplete combustion heat loss
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| CN111157266B (en) * | 2020-01-03 | 2021-06-15 | 浙江省特种设备科学研究院 | Boiler thermal power and thermal efficiency detection method without detecting working medium parameters |
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| CN112668893A (en) * | 2020-12-30 | 2021-04-16 | 新奥数能科技有限公司 | Real-time monitoring method, device and system for thermal efficiency of circulating fluidized bed boiler |
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| CN112933942A (en) * | 2021-01-29 | 2021-06-11 | 国电南京电力试验研究有限公司 | Boiler fuel efficiency calculation method adopting SNCR (selective non-catalytic reduction) denitration technology |
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