CN111325464A - Energy efficiency evaluation method for biomass blended combustion of coal-fired boiler - Google Patents
Energy efficiency evaluation method for biomass blended combustion of coal-fired boiler Download PDFInfo
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 97
- 239000002028 Biomass Substances 0.000 title claims abstract description 75
- 238000011156 evaluation Methods 0.000 title claims abstract description 57
- 239000003546 flue gas Substances 0.000 claims abstract description 54
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000003245 coal Substances 0.000 claims abstract description 40
- 239000000779 smoke Substances 0.000 claims abstract description 37
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 239000004071 soot Substances 0.000 claims abstract description 6
- 239000000470 constituent Substances 0.000 claims abstract description 5
- 238000005259 measurement Methods 0.000 claims description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- 229910052760 oxygen Inorganic materials 0.000 claims description 13
- 239000001301 oxygen Substances 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 6
- 231100001143 noxa Toxicity 0.000 claims description 5
- 238000010344 co-firing Methods 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 11
- 238000005070 sampling Methods 0.000 description 8
- 239000010881 fly ash Substances 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 239000002956 ash Substances 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- FMMWHPNWAFZXNH-UHFFFAOYSA-N Benz[a]pyrene Chemical compound C1=C2C3=CC=CC=C3C=C(C=C3)C2=C2C3=CC=CC2=C1 FMMWHPNWAFZXNH-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- TXVHTIQJNYSSKO-UHFFFAOYSA-N BeP Natural products C1=CC=C2C3=CC=CC=C3C3=CC=CC4=CC=C1C2=C34 TXVHTIQJNYSSKO-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 241000935974 Paralichthys dentatus Species 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- -1 alkyl mercury Chemical compound 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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Abstract
The application discloses an energy efficiency assessment method for biomass co-combustion of a coal-fired boiler, which comprises the following steps: obtaining coal types and biomass used for co-combustion of a coal-fired boiler; acquiring the flue gas temperature and the flue gas components at the outlet of an air preheater of the coal-fired boiler during blending combustion, and the primary air temperature and the secondary air temperature at the inlet of the air preheater; obtaining SO at chimney inlet flue of coal-fired boiler during mixed combustion2Concentration, NOxConcentration, soot concentration and heavy metal concentration; determining the thermal efficiency of the boiler during the mixed combustion of the coal and the biomass according to the temperature of the flue gas, the temperature of the primary air and the temperature of the secondary air; combining flue gas constituents according to SO2Concentration, NOxAnd determining the boiler emission evaluation result when the coal and the biomass are co-fired according to the concentration, the smoke concentration and the heavy metal concentration. The method solves the technical problem that no evaluation method for influence on boiler efficiency and an environmental protection system is available after biomass is co-fired.
Description
Technical Field
The application relates to the technical field of analysis of coal-fired boilers, in particular to an energy efficiency evaluation method for biomass co-combustion of a coal-fired boiler.
Background
With the development of science and technology and the attention of people on ecological environment, the energy supply structure faces the revolution, and the new energy replaces the traditional energy and the non-fossil energy replaces the fossil energy, which is the mainstream of the revolution at present.
The biomass fuel has the characteristics of high water content, complex components, low energy density and scattered distribution. The development of biomass energy can improve the world primary energy structure, relieve the contradiction between energy supply and demand, reduce greenhouse gas emission, protect the ecological environment and the like. The method for evaluating and analyzing the mixed combustion can effectively guide the related work of the mixed combustion of the biomass in the coal-fired boiler, however, no evaluation method for the influence of the mixed combustion of the biomass on the boiler efficiency and an environmental protection system exists at present.
Disclosure of Invention
The application provides an energy efficiency assessment method for biomass co-combustion of a coal-fired boiler, and solves the technical problem that no assessment method for influence on boiler efficiency and an environmental protection system is available after biomass co-combustion.
In view of the above, a first aspect of the present application provides a method for evaluating energy efficiency of biomass co-combustion in a coal-fired boiler, including:
obtaining coal types and biomass used for co-combustion of a coal-fired boiler;
acquiring the flue gas temperature and the flue gas components at the outlet of an air preheater of the coal-fired boiler during blending combustion, and the primary air temperature and the secondary air temperature at the inlet of the air preheater;
obtaining SO at the chimney inlet flue of the coal-fired boiler during mixed combustion2Concentration, NOxConcentration, soot concentration and heavy metal concentration;
determining the boiler thermal efficiency when the coal and the biomass are co-fired according to the flue gas temperature, the primary air temperature and the secondary air temperature;
combining said flue gas constituents according to said SO2Concentration of said NOxAnd determining the boiler emission evaluation result when the coal and the biomass are co-fired according to the concentration, the smoke concentration and the heavy metal concentration.
Alternatively,
the acquiring of the flue gas component information at the outlet of the air preheater of the coal-fired boiler during the co-combustion specifically comprises the following steps:
arranging measuring holes on an outlet flue of an air preheater of the coal-fired boiler, wherein each measuring hole is internally provided with 3 first measuring points;
during blending combustion, measuring the smoke components at each first measuring point to obtain corresponding sub-smoke components;
and (3) calculating the average value of each sub-flue gas component obtained by measurement by using an arithmetic mean method to obtain the flue gas component at the outlet of the air preheater of the coal-fired boiler.
Alternatively,
the step of acquiring the flue gas temperature at the outlet of the air preheater of the coal-fired boiler during the co-combustion specifically comprises the following steps:
measuring the sub-flue gas temperature at each first measuring point during blending combustion;
and (4) calculating the average value of the measured sub-flue gas temperatures by using an arithmetic mean method to obtain the flue gas temperature at the outlet of the air preheater of the coal-fired boiler.
Alternatively,
obtaining SO at the chimney inlet flue of the coal-fired boiler during co-combustion2The concentration specifically comprises:
setting a latticed second measuring point at a chimney inlet flue of the coal-fired boiler;
measuring SO at each second measuring point during the mixed combustion2The sub-concentration and corresponding oxygen concentration;
each of the SO2Seed concentration converterAfter the concentration is changed to the same oxygen concentration, carrying out arithmetic mean to obtain SO at the chimney inlet flue of the coal-fired boiler2And (4) concentration.
Alternatively,
obtaining NO at chimney inlet flue of the coal-fired boiler during co-combustionxThe concentration specifically comprises:
measuring NO at each of the second measurement points during co-firingxThe sub-concentration and corresponding oxygen concentration;
each of the NO isxAfter the sub-concentration is converted into the same oxygen concentration, carrying out arithmetic mean to obtain NO at the chimney inlet flue of the coal-fired boilerxAnd (4) concentration.
Alternatively,
the determining the boiler thermal efficiency when the coal and the biomass are co-fired according to the flue gas temperature, the primary air temperature and the secondary air temperature specifically comprises:
determining the boiler thermal efficiency during the mixed combustion of the coal and the biomass according to the flue gas temperature, the primary air temperature and the secondary air temperature based on a first preset formula, wherein the first preset formula is as follows:
η＝100-(q2+q3+q4+q5+q6+q7+qoth-qex)，
in the formula, q2For exhaust heat loss, η for boiler thermal efficiency, q3Heat loss due to incomplete combustion of gas, q4For incomplete combustion loss of solids, q5For heat dissipation losses, q6Is the physical heat loss of ash, q7For other heat losses, qothFor other input of heat, qexOther external heat.
Alternatively,
according to the SO2Concentration of said NOxDetermining the boiler emission evaluation result when the coal and the biomass are co-fired according to the concentration, the smoke concentration and the heavy metal concentration, and specifically comprising the following steps:
comparison of the SO2Concentration and SO2Threshold of concentrationValue of obtaining said SO2A second emission assessment result corresponding to the concentration;
comparison of the NOxConcentration and NOxA threshold concentration value to obtain the NOxA third emission evaluation result corresponding to the concentration;
comparing the smoke concentration with a smoke concentration threshold value to obtain a fourth emission evaluation result corresponding to the smoke concentration;
comparing the heavy metal concentration with a heavy metal concentration threshold value to obtain a fifth emission evaluation result corresponding to the heavy metal concentration;
and obtaining a boiler emission evaluation result when the coal and the biomass are co-combusted according to the first emission evaluation result, the second emission evaluation result, the third emission evaluation result, the fourth emission evaluation result and the fifth emission evaluation result.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a method for evaluating the energy efficiency of biomass co-combustion of a coal-fired boiler, which comprises the following steps: obtaining coal types and biomass used for co-combustion of a coal-fired boiler; acquiring the flue gas temperature and the flue gas components at the outlet of an air preheater of the coal-fired boiler during blending combustion, and the primary air temperature and the secondary air temperature at the inlet of the air preheater; obtaining SO at chimney inlet flue of coal-fired boiler during mixed combustion2Concentration, NOxConcentration, soot concentration and heavy metal concentration; determining the thermal efficiency of the boiler during the mixed combustion of the coal and the biomass according to the temperature of the flue gas, the temperature of the primary air and the temperature of the secondary air; combining flue gas constituents according to SO2Concentration, NOxAnd determining the boiler emission evaluation result when the coal and the biomass are co-fired according to the concentration, the smoke concentration and the heavy metal concentration. In this application, when the boiler mixes and burns living beings, discharge and assess boiler thermal efficiency and boiler to realize the aassessment of boiler efficiency and environmental protection system influence, thereby solved and do not have the present technical problem who burns the back to living beings, to the assessment method of boiler efficiency and environmental protection system influence.
Drawings
FIG. 1 is a schematic flow chart of a first embodiment of a method for evaluating the energy efficiency of biomass co-combustion of a coal-fired boiler according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a second embodiment of a method for evaluating energy efficiency of biomass co-combustion of a coal-fired boiler according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides an energy efficiency assessment method for biomass co-combustion of a coal-fired boiler, and solves the technical problem that no assessment method for influence on boiler efficiency and an environmental protection system is available after biomass co-combustion.
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a schematic flow chart of a first embodiment of a method for evaluating energy efficiency of co-combustion of biomass in a coal-fired boiler according to an embodiment of the present application includes:
The coal type and the biomass are determined according to the actual situation during the co-combustion.
102, acquiring the flue gas temperature and the flue gas components at the outlet of an air preheater of the coal-fired boiler during mixed combustion, and the primary air temperature and the secondary air temperature at the inlet of the air preheater.
The primary air temperature can be measured by a T-shaped thermocouple, and the secondary air temperature can be measured by a FLUKE intelligent temperature measuring instrument. And calculating the primary air temperature and the secondary air temperature by DCS data.
For SO2Measurement of concentration, usingIn the continuous measuring instrument, the sampling tube is heated to a temperature higher than 150 ℃. And high-purity qualified standard gas is adopted when the measuring instrument is calibrated. During the measurement, the measuring instrument is calibrated by using the standard gas at least once before and after the measurement.
For the measurement of the smoke concentration, sampling is carried out at the inlet flue of a chimney, and the test method comprises the following steps: gravimetric method. The smoke dust constant-speed sampling instrument is used for sampling by adopting a grid method, and the volume, the temperature, the pressure and the atmospheric pressure of sampled smoke gas, the empty weight of the smoke dust sampling filter cylinder and the actual weight after sampling are recorded in the sampling process. And calculating to obtain the smoke concentration.
For the measurement of heavy metal concentration, heavy metal includes fly ash, slag, raw coal and biomass mixed sample, and the test item includes: analyzing and testing pH value, mercury, cadmium, lead, arsenic, nickel, total chromium, hexavalent chromium, copper, zinc, beryllium, barium, silver, selenium, alkyl mercury, cyanide and benzo (a) pyrene, sampling each sample for 2 times, and carrying out test measurement.
And step 104, determining the thermal efficiency of the boiler during the mixed combustion of the coal and the biomass according to the flue gas temperature, the primary air temperature and the secondary air temperature.
105, combining the flue gas components according to SO2Concentration, NOxAnd determining the boiler emission evaluation result when the coal and the biomass are co-fired according to the concentration, the smoke concentration and the heavy metal concentration.
In this embodiment, the coal type and biomass used for co-combustion in the coal-fired boiler are first obtained, the flue gas temperature at the outlet of the air preheater of the coal-fired boiler during co-combustion, the primary air temperature and the secondary air temperature at the inlet of the air preheater are then obtained, and the SO at the inlet flue of the chimney of the coal-fired boiler during co-combustion is then obtained2Concentration, NOxConcentration, smoke concentration and heavy metal concentration, determining the thermal efficiency of the boiler during the mixed combustion of coal and biomass according to the temperature of the flue gas, the temperature of primary air and the temperature of secondary air, finally combining the components of the flue gas and according to SO2Concentration, NOxAnd determining the boiler emission evaluation result when the coal and the biomass are co-fired according to the concentration, the smoke concentration and the heavy metal concentration. In this application, when the boiler mixes the burning living beings, to boiler thermal efficiencyAnd evaluating the boiler emission to realize the evaluation of the influence of the boiler efficiency and the environmental protection system, thereby solving the technical problem that the existing evaluation method for the influence of the boiler efficiency and the environmental protection system after the biomass is co-fired does not exist.
The above is a first embodiment of the energy efficiency evaluation method for biomass co-combustion in a coal-fired boiler provided by the embodiment of the present application, and the following is a second embodiment of the energy efficiency evaluation method for biomass co-combustion in a coal-fired boiler provided by the embodiment of the present application.
Referring to fig. 2, a schematic flow chart of a second embodiment of a method for evaluating energy efficiency of co-combustion of biomass in a coal-fired boiler according to an embodiment of the present application includes:
Step 201 is the same as the description of step 101 in the first embodiment, and reference may be specifically made to the above description, which is not repeated herein.
And 203, measuring the smoke components at each first measuring point during the mixed combustion to obtain corresponding sub-smoke components.
And step 204, calculating the average value of the sub-flue gas components obtained by measurement by using an arithmetic mean method to obtain the flue gas components at the outlet of the air preheater of the coal-fired boiler.
And step 205, measuring the sub-flue gas temperature at each first measuring point during the mixed combustion.
And step 206, averaging the measured sub-flue gas temperatures by using an arithmetic mean method to obtain the flue gas temperature at the outlet of the air preheater of the coal-fired boiler.
And step 207, acquiring the primary air temperature and the secondary air temperature at the inlet of the mixed combustion air preheater.
208, obtaining SO at a chimney inlet flue of the coal-fired boiler during co-combustion2Concentration, NOxConcentration, soot concentration and heavy metal concentration.
Obtaining smoke of coal-fired boiler during mixed combustionNO at chimney inlet fluexThe concentration specifically comprises:
during the co-firing, the NO at each second measurement point is measuredxThe sub-concentration and corresponding oxygen concentration;
each NO isxAfter the sub-concentration is converted to the same oxygen concentration, arithmetic mean is carried out to obtain NO at the chimney inlet flue of the coal-fired boilerxAnd (4) concentration.
The measured SO2 concentrations are shown in Table 1, from which it can be seen that the statistical mean value of the measured SO2 concentrations was 61.1mg/Nm3 (6% O2).
Table 1/unit: mg/m3, 6% O2
Obtaining SO at chimney inlet flue of coal-fired boiler during mixed combustion2The concentration specifically comprises:
setting a latticed second measuring point at a chimney inlet flue of the coal-fired boiler;
measuring SO at each second measuring point during the blending combustion2The sub-concentration and corresponding oxygen concentration;
each SO is added2After the sub-concentration is converted into the same oxygen concentration, carrying out arithmetic mean to obtain SO at the chimney inlet flue of the coal-fired boiler2And (4) concentration.
Note that the NOx concentration was measured in the stack inlet flue, and the measurement data are shown in table 2, and it can be seen from table 2 that the NOx concentration was 152.3mg/Nm3 (6% O2).
Table 2/unit: mg/m3, 6% O2
The measured concentration of the heavy metal is shown in table 3, and as can be seen from table 3, the heavy metal elements in the flue gas at the inlet of the chimney meet the requirements of environmental protection. The actual measurement mercury emission concentrations of the biomass co-combustion 0% and 45% ratio working conditions are respectively 17.35 mug/m 3 and 7.09 mug/m 3, and the mercury emission concentration is reduced after the biomass is co-combusted.
| Symbol | Unit of | Without mixed burning | 45% biomass | Emission limit |
| Tl | mg/m3 | 0.0349 | 0.0449 | |
| As | mg/m3 | 00514 | 00642 | |
| Cr | mg/m3 | 0.0177 | 0.0168 | |
| Cd | mg/m3 | 00011 | 00012 | 01 |
| Sb | mg/m3 | 0.0398 | 0.0405 | |
| Pb | mg/m3 | 00789 | 00804 | 16 |
| Cd+Tl | mg/m3 | ＜00361 | ＜00461 | 01 |
| Hg | mg/m3 | 0.01735 | 0.00709 | 0.05 |
And 209, determining the thermal efficiency of the boiler during the mixed combustion of the coal and the biomass according to the flue gas temperature, the primary air temperature and the secondary air temperature.
According to the flue gas temperature, the primary air temperature and the secondary air temperature, the boiler thermal efficiency when the coal and biomass are co-fired is determined to specifically comprise the following steps:
based on a first preset formula, determining the thermal efficiency of the boiler during the mixed combustion of the coal and the biomass according to the flue gas temperature, the primary air temperature and the secondary air temperature, wherein the first preset formula is as follows:
η＝100-(q2+q3+q4+q5+q6+q7+qoth-qex)，
in the formula, q2For exhaust heat loss, η for boiler thermal efficiency, q3Heat loss due to incomplete combustion of gas, q4For incomplete combustion loss of solids, q5For heat dissipation losses, q6Is the physical heat loss of ash, q7For other heat losses, qothFor other input of heat, qexOther external heat.
It will be appreciated that q is defined above2、q3、q4、q5、q6、q7、qoth、qexIs calculated according to the parameters of primary air temperature, secondary air temperature, fly ash, carbon content of slag, air quantity, coal quantity and the like.
The calculated thermal efficiency of the boiler is shown in Table 3, and the coal-fired boiler is under 60MW load condition
TABLE 3
| Name (R) | Working condition 1 | Working condition 2 | Working condition 3 | Working condition 4 |
| Proportion of biomass blended combustion | Without mixed burning | 15% mixed burning | 30% mixed burning | 45% mixed burning |
| Load of unit | 60 | 60 | 60 | 60 |
| Fly ash combustible material | 8.88 | 13.04 | 10.54 | 10.05 |
| Combustible slag | 4.69 | 3.19 | 3.86 | 4.06 |
| Oxygen content of exhaust gas | 6.52 | 6.40 | 6.60 | 7.13 |
| Exhaust gas temperature | 148.45 | 151.05 | 149.85 | 149.45 |
| Heat loss of exhaust | 6.832 | 7.064 | 7.624 | 8.373 |
| Chemical incomplete combustion loss | 0.034 | 0.035 | 0.068 | 0.025 |
| Loss of incomplete combustion of solids | 12.064 | 13.746 | 9.367 | 6.553 |
| Designed heat dissipation loss | 0.19 | 0.19 | 0.19 | 0.19 |
| Physical heat loss of ash | 0.409 | 0.354 | 0.285 | 0.206 |
| Heat from outside of input system | 0.617 | 0.791 | 0.717 | 0.555 |
| Heat loss of desulfurization in furnace | 0.58 | 0.39 | 0.26 | 0.07 |
| Thermal efficiency of boiler | 80.51 | 79.01 | 82.92 | 85.14 |
From the test results, under the 60MW load condition, the fly ash combustibles of the working conditions of 0%, 15%, 30% and 45% are respectively 8.88%, 13.04%, 10.54% and 10.05%, and the slag combustibles are respectively 4.69%, 3.19%, 3.86% and 4.06%, so that the fly ash slag combustibles are not greatly affected by the blending combustion. However, the ash content of the fuel fed into the furnace after the blending combustion is greatly reduced, so the calculated solid incomplete heat loss is greatly reduced along with the increase of the blending combustion proportion, and the working condition solid incomplete heat loss of 0%, 15%, 30% and 45% of the blending combustion proportion is 12.064%, 13.746%, 9.367% and 6.553% respectively. The main heat loss caused by co-combustion of biomass is increased to the heat loss of the exhaust smoke, the water content of the fuel entering the furnace caused by co-combustion of biomass is increased to be the main reason of the heat loss of the exhaust smoke, and the heat loss of the exhaust smoke under the working conditions of 0 percent, 15 percent, 30 percent and 45 percent of co-combustion proportion is 6.832 percent, 7.064 percent, 7.624 percent and 8.373 percent respectively. The working condition thermal efficiencies of the co-combustion proportion of 0%, 15%, 30% and 45% are respectively 80.51%, 79.01%, 82.92% and 85.14%, so that the boiler efficiency can be greatly improved by co-combustion of biomass.
Note that, according to SO2Concentration, NOxThe method comprises the following steps of determining the boiler emission evaluation results when coal and biomass are co-fired according to the concentration, the smoke concentration and the heavy metal concentration, wherein the boiler emission evaluation results specifically comprise the following steps:
comparative SO2Concentration and SO2Obtaining SO at the concentration threshold2Concentration corresponding second emissionEvaluating the result;
comparative NOxConcentration and NOxConcentration threshold to obtain NOxA third emission evaluation result corresponding to the concentration;
comparing the smoke concentration with a smoke concentration threshold value to obtain a fourth emission evaluation result corresponding to the smoke concentration;
comparing the heavy metal concentration with a heavy metal concentration threshold value to obtain a fifth emission evaluation result corresponding to the heavy metal concentration;
and obtaining a boiler emission evaluation result during coal and biomass co-combustion according to the first emission evaluation result, the second emission evaluation result, the third emission evaluation result, the fourth emission evaluation result and the fifth emission evaluation result.
It can be understood that the boiler emission evaluation result is qualified when the coal type and the biomass co-combustion are performed when the first emission evaluation result, the second emission evaluation result, the third emission evaluation result, the fourth emission evaluation result and the fifth emission evaluation result all satisfy the corresponding concentration preset.
In this embodiment, the coal type and biomass used for co-combustion in the coal-fired boiler are first obtained, the flue gas temperature at the outlet of the air preheater of the coal-fired boiler during co-combustion, the primary air temperature and the secondary air temperature at the inlet of the air preheater are then obtained, and the SO at the inlet flue of the chimney of the coal-fired boiler during co-combustion is then obtained2Concentration, NOxConcentration, smoke concentration and heavy metal concentration, determining the thermal efficiency of the boiler during the mixed combustion of coal and biomass according to the temperature of the flue gas, the temperature of primary air and the temperature of secondary air, finally combining the components of the flue gas and according to SO2Concentration, NOxAnd determining the boiler emission evaluation result when the coal and the biomass are co-fired according to the concentration, the smoke concentration and the heavy metal concentration. In this application, when the boiler mixes and burns living beings, discharge and assess boiler thermal efficiency and boiler to realize the aassessment of boiler efficiency and environmental protection system influence, thereby solved and do not have the present technical problem who burns the back to living beings, to the assessment method of boiler efficiency and environmental protection system influence.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (7)
1. A method for evaluating the energy efficiency of biomass co-combustion of a coal-fired boiler is characterized by comprising the following steps:
obtaining coal types and biomass used for co-combustion of a coal-fired boiler;
acquiring the flue gas temperature and the flue gas components at the outlet of an air preheater of the coal-fired boiler during blending combustion, and the primary air temperature and the secondary air temperature at the inlet of the air preheater;
obtaining SO at the chimney inlet flue of the coal-fired boiler during mixed combustion2Concentration, NOxConcentration, soot concentration and heavy metal concentration;
determining the boiler thermal efficiency when the coal and the biomass are co-fired according to the flue gas temperature, the primary air temperature and the secondary air temperature;
combining said flue gas constituents according to said SO2Concentration of said NOxAnd determining the boiler emission evaluation result when the coal and the biomass are co-fired according to the concentration, the smoke concentration and the heavy metal concentration.
2. The energy efficiency evaluation method for co-combustion of biomass in a coal-fired boiler according to claim 1, wherein the obtaining of the flue gas composition at the outlet of the air preheater of the coal-fired boiler during co-combustion specifically comprises:
arranging measuring holes on an outlet flue of an air preheater of the coal-fired boiler, wherein each measuring hole is internally provided with 3 first measuring points;
during blending combustion, measuring the smoke components at each first measuring point to obtain corresponding sub-smoke components;
and (3) calculating the average value of each sub-flue gas component obtained by measurement by using an arithmetic mean method to obtain the flue gas component at the outlet of the air preheater of the coal-fired boiler.
3. The energy efficiency evaluation method for co-combustion of biomass in a coal-fired boiler according to claim 2, wherein the obtaining of the flue gas temperature at the outlet of the air preheater of the coal-fired boiler during co-combustion specifically comprises:
measuring the sub-flue gas temperature at each first measuring point during blending combustion;
and (4) calculating the average value of the measured sub-flue gas temperatures by using an arithmetic mean method to obtain the flue gas temperature at the outlet of the air preheater of the coal-fired boiler.
4. The energy efficiency evaluation method for biomass co-combustion of coal-fired boiler according to claim 1, characterized in that the SO at the chimney inlet flue of the coal-fired boiler during co-combustion is obtained2The concentration specifically comprises:
setting a latticed second measuring point at a chimney inlet flue of the coal-fired boiler;
measuring SO at each second measuring point during the mixed combustion2The sub-concentration and corresponding oxygen concentration;
each of the SO2After the concentration of the sub-particles is converted to be the same as the concentration of the oxygen, carrying out arithmetic mean to obtain SO at the inlet flue of the chimney of the coal-fired boiler2And (4) concentration.
5. The method for evaluating the energy efficiency of biomass co-fired of coal-fired boiler according to claim 4, characterized in that the NO at the chimney inlet flue of the coal-fired boiler during co-firing is obtainedxThe concentration specifically comprises:
measuring NO at each of the second measurement points during co-firingxThe sub-concentration and corresponding oxygen concentration;
each of the NO isxAfter the sub-concentration is converted into the same oxygen concentration, carrying out arithmetic mean to obtain NO at the chimney inlet flue of the coal-fired boilerxAnd (4) concentration.
6. The method for evaluating the energy efficiency of biomass co-combustion of a coal-fired boiler according to claim 1, wherein the determining the boiler thermal efficiency during co-combustion of the coal and the biomass according to the flue gas temperature, the primary air temperature and the secondary air temperature specifically comprises:
determining the boiler thermal efficiency during the mixed combustion of the coal and the biomass according to the flue gas temperature, the primary air temperature and the secondary air temperature based on a first preset formula, wherein the first preset formula is as follows:
η＝100-(q2+q3+q4+q5+q6+q7+qoth-qex)，
in the formula, q2For exhaust heat loss, η for boiler thermal efficiency, q3Heat loss due to incomplete combustion of gas, q4For incomplete combustion loss of solids, q5For heat dissipation losses, q6Is the physical heat loss of ash, q7For other heat losses, qothFor other input of heat, qexOther external heat.
7. The method for evaluating the energy efficiency of biomass co-fired coal-fired boiler according to claim 1, wherein the energy efficiency is evaluated according to the SO2Concentration of said NOxDetermining the boiler emission evaluation result when the coal and the biomass are co-fired according to the concentration, the smoke concentration and the heavy metal concentration, and specifically comprising the following steps:
comparison of the SO2Concentration and SO2A concentration threshold value to obtain the SO2A second emission assessment result corresponding to the concentration;
comparison of the NOxConcentration and NOxA threshold concentration value to obtain the NOxA third emission evaluation result corresponding to the concentration;
comparing the smoke concentration with a smoke concentration threshold value to obtain a fourth emission evaluation result corresponding to the smoke concentration;
comparing the heavy metal concentration with a heavy metal concentration threshold value to obtain a fifth emission evaluation result corresponding to the heavy metal concentration;
and obtaining a boiler emission evaluation result when the coal and the biomass are co-combusted according to the first emission evaluation result, the second emission evaluation result, the third emission evaluation result, the fourth emission evaluation result and the fifth emission evaluation result.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090274986A1 (en) * | 2008-04-30 | 2009-11-05 | Walsh Jr William Arthur | Merging combustion of biomass and fossil fuels in boilers |
| CN103697946A (en) * | 2013-12-05 | 2014-04-02 | 贵州电网公司电力调度控制中心 | Method for calculating flue gas flow of coal-fired boiler in heat-engine plant and method for controlling pollutant discharge amount |
| CN103995987A (en) * | 2014-06-05 | 2014-08-20 | 中冶华天工程技术有限公司 | Heat efficiency calculating method for pulverized coal boiler with blending combustion of blast furnace gas |
| CN109163324A (en) * | 2018-09-12 | 2019-01-08 | 广东电网有限责任公司 | A kind of appraisal procedure, device, equipment and the storage medium of sludge mixed burning boiler |
| CN109611813A (en) * | 2018-10-16 | 2019-04-12 | 沈阳环境科学研究院 | A kind of boiler efficiency on-line monitoring method and system |
| CN110375289A (en) * | 2019-06-27 | 2019-10-25 | 广西电网有限责任公司电力科学研究院 | A kind of coal-fired power station boiler monitoring system and its thermal efficiency test method |
-
2020
- 2020-02-18 CN CN202010099933.6A patent/CN111325464A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090274986A1 (en) * | 2008-04-30 | 2009-11-05 | Walsh Jr William Arthur | Merging combustion of biomass and fossil fuels in boilers |
| CN103697946A (en) * | 2013-12-05 | 2014-04-02 | 贵州电网公司电力调度控制中心 | Method for calculating flue gas flow of coal-fired boiler in heat-engine plant and method for controlling pollutant discharge amount |
| CN103995987A (en) * | 2014-06-05 | 2014-08-20 | 中冶华天工程技术有限公司 | Heat efficiency calculating method for pulverized coal boiler with blending combustion of blast furnace gas |
| CN109163324A (en) * | 2018-09-12 | 2019-01-08 | 广东电网有限责任公司 | A kind of appraisal procedure, device, equipment and the storage medium of sludge mixed burning boiler |
| CN109611813A (en) * | 2018-10-16 | 2019-04-12 | 沈阳环境科学研究院 | A kind of boiler efficiency on-line monitoring method and system |
| CN110375289A (en) * | 2019-06-27 | 2019-10-25 | 广西电网有限责任公司电力科学研究院 | A kind of coal-fired power station boiler monitoring system and its thermal efficiency test method |
Non-Patent Citations (1)
| Title |
|---|
| 张小桃等: "燃煤锅炉掺烧生物质气运行效率及污染物排放模拟", 《农业工程学报》 * |
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