CN106402852B - A method of burning coal - Google Patents
A method of burning coal Download PDFInfo
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- CN106402852B CN106402852B CN201610792426.4A CN201610792426A CN106402852B CN 106402852 B CN106402852 B CN 106402852B CN 201610792426 A CN201610792426 A CN 201610792426A CN 106402852 B CN106402852 B CN 106402852B
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- coal
- feed point
- method described
- supplying amount
- fluidized bed
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- 239000003245 coal Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 35
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002817 coal dust Substances 0.000 claims abstract description 19
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 18
- 239000011593 sulfur Substances 0.000 claims abstract description 18
- 230000008030 elimination Effects 0.000 claims abstract description 17
- 238000003379 elimination reaction Methods 0.000 claims abstract description 17
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000292 calcium oxide Substances 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 11
- 238000004140 cleaning Methods 0.000 abstract description 3
- 235000019738 Limestone Nutrition 0.000 description 7
- 239000006028 limestone Substances 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- JGIATAMCQXIDNZ-UHFFFAOYSA-N calcium sulfide Chemical compound [Ca]=S JGIATAMCQXIDNZ-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 239000010117 shenhua Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/22—Fuel feeders specially adapted for fluidised bed combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/28—Control devices specially adapted for fluidised bed, combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2206/00—Fluidised bed combustion
- F23C2206/10—Circulating fluidised bed
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The present invention relates to cleaning combustion fields, disclose a kind of method of burning coal, and this method includes：In the presence of sulfur elimination, coal dust is set to burn in circulating fluidized bed boiler, measure the observed temperature at each coal feed point in boiler hearth of circulating fluidized bed, and control the coal-supplying amount A at observed temperature 10 DEG C of coal feed point at least higher than the arithmetic mean of instantaneous value of observed temperature at each coal feed point and the coal-supplying amount B at remaining coal feed point so that A：B=1：38, preferably 1：4‑6.According to the method for the present invention, SO can be effectively reduced on the basis of not adding any other equipment and ensureing that total coal-supplying amount is constant2、NOxEmission level, to reach the thermal power plant atmosphere pollution SO of national regulation2、NOxConcentration of emission is respectively lower than 200mg/Nm3Standard.
Description
Technical field
The present invention relates to cleaning combustion fields, and in particular, to a method of burning coal.
Background technology
Recirculating fluidized bed (CFB) combustion technology is a kind of novel clean-burning technology that developed recently gets up, at home
It is widely applied and greatly develops outside.One side circulating fluidized bed boiler fuel wide adaptability, the general thermal coal of burning,
Also burning washing is got off gangue washes middle coal and coal slime etc.；Another aspect circulating fluidized bed boiler has high combustion efficiency,
High-efficiency desulfurization in stove, and nitrogen oxides (NOx) environmental protection characteristics such as low emission；Circulating fluidized bed boiler also has load tune simultaneously
Adjusting range is big, and low-load combustion-stabilizing is good, lime-ash be easy to comprehensive utilization the advantages that, therefore Combustion technology of circulating fluidized be it is current I
Most suitably used and most real high-efficiency cleaning combustion technology in state's coal combustion technology field.But with《Thermal power plant's Air Pollutant Emission
Standard》(GB13223-2011) implement SO2、NOxConcentration of emission need to be respectively lower than 200mg/Nm3Standard, the overwhelming majority gone into operation
CFB units there will be SO2、NOxDischarge is difficult to problem up to standard.
Invention content
The purpose of the present invention is overcome circulating fluidized bed boiler then SO after coal charge2、NOxEmission level is difficult to reach country
Defined thermal power plant's atmosphere pollution SO2、NOxConcentration of emission is respectively lower than 200mg/Nm3Standard the problem of, a kind of combustion is provided
Burn the method for coal.
To achieve the goals above, the present invention provides a kind of method of burning coal, this method includes：In depositing for sulfur elimination
Under, coal dust is made to burn in circulating fluidized bed boiler, measures the reality at each coal feed point in boiler hearth of circulating fluidized bed
Testing temperature, and control at observed temperature 10 DEG C of coal feed point at least higher than the arithmetic mean of instantaneous value of observed temperature at each coal feed point to
The coal amount A and coal-supplying amount B at remaining coal feed point so that A：B=1：3-8, preferably 1：4-6.
Through the above technical solutions, the present invention can not add any other equipment and ensure the constant base of total coal-supplying amount
On plinth, it is effectively reduced SO2、NOxEmission level, to reach the thermal power plant atmosphere pollution SO of national regulation2、NOxConcentration of emission
Respectively lower than 200mg/Nm3Standard.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below.It should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
The present invention provides a kind of method of burning coal, this method includes：In the presence of sulfur elimination, coal dust is made to recycle
It burns in fluidized-bed combustion boiler, measures the observed temperature at each coal feed point in boiler hearth of circulating fluidized bed, and control actual measurement
Temperature is than the coal-supplying amount A at the coal feed point of the arithmetic mean of instantaneous value of observed temperature at each coal feed point at least 10 DEG C high (such as 10-50 DEG C)
With the coal-supplying amount B at remaining coal feed point so that A：B=1：3-8, preferably 1：4-6.Wherein, total coal-supplying amount=coal-supplying amount A+ gives
Coal amount B, and the coal-supplying amount at each coal feed point of coal-supplying amount A account for total coal-supplying amount (i.e. coal-supplying amount A+ coal-supplying amount B) percentage it is preferred
Difference is no more than 5%, and similarly, the coal-supplying amount at each coal feed point of coal-supplying amount B accounts for the preferred difference of percentage of total coal-supplying amount not
More than 5%.
Wherein, coal feed point refers to the outlet for the coal spout side in burner hearth for adding coal；Arithmetic mean of instantaneous value refers to by institute
Have number add up again divided by number the obtained mean value of number；The method for measuring actual temperature at each coal feed point in burner hearth can
Think and buries thermocouple (being purchased from Anhui Land Group Co., Ltd.) at each coal feed point；Coal-supplying amount is different everywhere for control
Method can be carried out by controlling the coal-supplying amount at each coal feed point, specifically, the rotating speed for changing each feeder can be passed through
To adjust the coal-supplying amount of coal feed point.
According to the present invention, to the condition of burning, there is no particular limitation, as long as can make coal normal combustion.It is preferred that
The condition on ground, the burning includes：Observed temperature at each coal feed point (i.e. identical or differently) is respectively 790-955 DEG C, mistake
Amount air coefficient is 0.8-1.4.It is highly preferred that the condition of the burning includes：Respective (the i.e. phase of observed temperature at each coal feed point
It is together or differently) 830-920 DEG C, excess air coefficient 1-1.2.Wherein, excess air coefficient refers to that burning 1kg fuel is real
The ratio of the air quality and the air quality needed for theoretically completely burned 1kg fuel of border supply；Under normal conditions, theoretically
Air quality needed for completely burned 1kg coal dusts is 0.15-0.2kg.
According to the present invention, to total coal-supplying amount, there is no particular limitation, can be total coal-supplying amount commonly used in the art.It is preferred that
Ground is 1m relative to volume3Boiler hearth of circulating fluidized bed, total coal-supplying amount be 0.01-0.125t/h, more preferably 0.05-
0.1t/h。
According to the present invention, to the size of coal dust, there is no particular limitation, can be coal dust commonly used in the art.Preferably,
Grain size is 90 weight % or more, more preferably 95- in the content of the coal dust of 10mm or less (such as 0.01-10mm) in the coal dust
100 weight %.
According to the present invention, to the type, size and dosage of sulfur elimination, there is no particular limitation, as long as can reach sulphur removal
Effect.Preferably, the sulfur elimination is calcium carbonate and/or calcium oxide.Wherein, calcium carbonate can be provided by lime stone.It is excellent
Selection of land, grain size is 90 weight % or more in the content of the sulfur elimination of 1.5mm or less (such as 0.01-1.5mm) in sulfur elimination, more preferably
For 95-100 weight %.Preferably, the weight ratio of coal dust and sulfur elimination is 1：0.02-0.2, more preferably 1：0.05-0.1；I.e.
Calcium sulfur ratio (molar ratio of element sulphur in calcium constituent and coal dust in sulfur elimination) is about 1：1-10.
According to a kind of preferred embodiment, wherein there are six coal feed point, each coal feed points for the circulating fluidized bed boiler tool
The arithmetic mean of instantaneous value for locating observed temperature is 860-870 DEG C, and the temperature measured in burner hearth at six coal feed points is respectively 835-845
DEG C, 850-860 DEG C, 890-900 DEG C, 895-905 DEG C, 855-865 DEG C and 830-840 DEG C, adjust six coal feed points coal-supplying amount
It is respectively 20-22%, 17-19%, 10-12%, 9-11%, 18-20% and 20-22% so that it is accounted for the percentage of total coal-supplying amount,
It is 1m relative to volume3Boiler hearth of circulating fluidized bed, total coal-supplying amount be 0.05-0.1t/h.
The present invention will be described in detail by way of examples below.
In following embodiment, coal dust (grain size is 98 weight %, carbon containing 90 weight % in the content of 10mm coal dusts below,
Nitrogenous 0.98 weight %, 0.45 weight % of sulfur-bearing) purchased from the eastern coal group of Shenhua god, theoretically needed for completely burned 1kg coal dusts
Air quality be 0.18kg；(content of calcium carbonate is 90 weight % to lime stone, and grain size contains 1.5mm lime stones below
Amount is 98 weight %) purchased from Shanxi Baode rapid development Co., Ltd；(there are six coal feed point, combustion spaces for tool for circulating fluidized bed boiler
For 800m3) it is purchased from DEC Dongfang Boiler (Group) Co., Ltd., model DG520/13.7 II 1；Used in thermometric
Thermocouple is purchased from Anhui Land Group Co., Ltd.；Measure NOxAnd SO2The device of discharge capacity is that SCS-900 flue gases are continuously supervised
Examining system is purchased from Beijing SDL Technology Co., Ltd..
Embodiment 1
Coal dust (total coal-supplying amount is 43.2t/h) and lime stone (2.35t/ are continuously added into boiler hearth of circulating fluidized bed
H), excess air coefficient 1.2, the temperature that six coal feed points are measured with thermocouple is respectively 836 DEG C, 853 DEG C, 890 DEG C, 895
DEG C, 851 DEG C and 830 DEG C, the arithmetic mean of instantaneous value of observed temperature is 859 DEG C at each coal feed point, adjusts the coal-supplying amount of six coal feed points
It is respectively 22%, 19%, 8%, 10%, 20% and 21% so that it is accounted for the percentage of total coal-supplying amount.Measure NOxAnd SO2Discharge capacity point
It Wei not 176mg/Nm3And 169mg/Nm3。
Embodiment 2
Coal dust (total coal-supplying amount is 45.4t/h) and lime stone (3.37t/ are continuously added into boiler hearth of circulating fluidized bed
H), excess air coefficient 1.1, the temperature that six coal feed points are measured with thermocouple is respectively 850 DEG C, 861 DEG C, 869 DEG C, 871
DEG C, 862 DEG C and 848 DEG C, the arithmetic mean of instantaneous value of observed temperature is 860 DEG C at each coal feed point, adjusts the coal-supplying amount of six coal feed points
It is respectively 21%, 19%, 10%, 10%, 20% and 20% so that it is accounted for the percentage of total coal-supplying amount.Measure NOxAnd SO2Discharge capacity
Respectively 179mg/Nm3And 174mg/Nm3。
Embodiment 3
Coal dust (total coal-supplying amount is 63.5t/h) and lime stone (4.6kg/ are continuously added into boiler hearth of circulating fluidized bed
H), excess air coefficient 1.2, the temperature that six coal feed points are measured with thermocouple is respectively 852 DEG C, 884 DEG C, 915 DEG C, 920
DEG C, 879 DEG C and 859 DEG C, the arithmetic mean of instantaneous value of observed temperature is 885 DEG C at each coal feed point, adjusts the coal-supplying amount of six coal feed points
It is respectively 20%, 20%, 10%, 9%, 20% and 21% so that it is accounted for the percentage of total coal-supplying amount.Measure NOxAnd SO2Discharge capacity point
It Wei not 183mg/Nm3And 177mg/Nm3。
Embodiment 4
Coal dust (total coal-supplying amount is 64t/h) and lime stone (5.4kg/h) are continuously added into boiler hearth of circulating fluidized bed,
Excess air coefficient is 1.1, the temperature that six coal feed points are measured with thermocouple is respectively 865 DEG C, 876 DEG C, 903 DEG C, 910 DEG C,
874 DEG C and 869 DEG C, the arithmetic mean of instantaneous value of observed temperature is 883 DEG C at each coal feed point, adjusts the coal-supplying amount of six coal feed points and makes it
The percentage for accounting for total coal-supplying amount is respectively 22%, 20%, 8%, 7%, 21% and 22%.Measure NOxAnd SO2Discharge capacity is respectively
182mg/Nm3And 173mg/Nm3。
Embodiment 5
According to the method burning coal of embodiment 1, the difference is that, adjusting the coal-supplying amount of six coal feed points makes it account for total coal-supplying amount
Percentage be respectively 18%, 16%, 12%, 13%, 17% and 19%.Measure NOxAnd SO2Discharge capacity is respectively 194mg/Nm3
And 183mg/Nm3。
Embodiment 6
According to the method burning coal of embodiment 1, the difference is that, adjusting the coal-supplying amount of six coal feed points makes it account for total coal-supplying amount
Percentage be respectively 23%, 19%, 6%, 7%, 23% and 22%.Measure NOxAnd SO2Discharge capacity is respectively 191mg/Nm3With
186mg/Nm3。
Embodiment 7
According to the method burning coal of embodiment 1, the difference is that, excess air coefficient 1.4.Measure NOxAnd SO2Discharge capacity
Respectively 193mg/Nm3And 190mg/Nm3。
Comparative example 1
According to the method burning coal of embodiment 1, the difference is that, the coal-supplying amount of six coal feed points is equal.Measure NOxAnd SO2Row
It is respectively high-volume 260mg/Nm3And 237mg/Nm3。
Comparative example 2
According to the method burning coal of embodiment 3, the difference is that, the coal-supplying amount of six coal feed points is equal.Measure NOxAnd SO2Row
It is respectively high-volume 271mg/Nm3And 254mg/Nm3。
From embodiment 1-7 as can be seen that using method burning coal of the invention, NO in tail gasxAnd SO2Discharge capacity reaches
The thermal power plant atmosphere pollution SO of national regulation2、NOxConcentration of emission is respectively lower than 200mg/Nm3Standard.Particularly, compare
Embodiment 1 and comparative example 1 and embodiment 3 and comparative example 2 as can be seen that the present invention method can not add it is any other
Equipment and on the basis of ensureing that total coal-supplying amount is constant, is effectively reduced SO2、NOxEmission level achieves unexpected technology
Effect.In addition, comparing embodiment 1 and embodiment 5-6 can be seen that the ratio as coal-supplying amount A and B in preferred scope of the invention
Effect is more preferable when interior；Comparing embodiment 1 is with embodiment 7 as can be seen that when excess air coefficient is in the preferred scope of the present invention
Shi Xiaoguo is also more preferable.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail can carry out a variety of simple variants to technical scheme of the present invention within the scope of the technical concept of the present invention, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (14)
1. a kind of method of burning coal, which is characterized in that this method includes：In the presence of sulfur elimination, make coal dust in recycle stream
It burns in fluidized bed boiler, measures the observed temperature at each coal feed point in boiler hearth of circulating fluidized bed, and control actual measurement temperature
At coal-supplying amount A and remaining coal feed point at degree 10 DEG C of coal feed point at least higher than the arithmetic mean of instantaneous value of observed temperature at each coal feed point
Coal-supplying amount B so that A：B=1：3-8.
2. according to the method described in claim 1, wherein, A：B=1：4-6.
3. according to the method described in claim 2, wherein, the condition of the burning includes：Observed temperature at each coal feed point is each
From being 790-955 DEG C, excess air coefficient 1.1-1.4.
4. method according to claim 1 or 3, wherein the condition of the burning includes：Observed temperature at each coal feed point
Respectively 830-920 DEG C, excess air coefficient 1.1-1.2.
5. according to the method described in claim 1, being 1m relative to volume wherein3Boiler hearth of circulating fluidized bed, always give coal
Amount is 0.01-0.125t/h.
6. according to the method described in claim 5, being 1m relative to volume wherein3Boiler hearth of circulating fluidized bed, always give coal
Amount is 0.05-0.1t/h.
7. according to the method described in claim 1, wherein, grain size is 90 weights in the content of 10mm coal dusts below in the coal dust
Measure % or more.
8. according to the method described in claim 7, wherein, grain size is 95 weights in the content of 10mm coal dusts below in the coal dust
Measure % or more.
9. according to the method described in claim 1, wherein, the sulfur elimination is calcium carbonate and/or calcium oxide.
10. according to the method described in claim 1, wherein, content of the grain size in 1.5mm sulfur eliminations below in the sulfur elimination
For 90 weight % or more.
11. according to the method described in claim 10, wherein, grain size containing in 1.5mm sulfur eliminations below in the sulfur elimination
Amount is 95 weight % or more.
12. according to the method described in claim 1, wherein, the weight ratio of coal dust and sulfur elimination is 1：0.02-0.2.
13. according to the method for claim 12, wherein the weight ratio of coal dust and sulfur elimination is 1：0.05-0.1.
14. according to the method described in claim 1, wherein, there are six coal feed point, each coal feed points for the circulating fluidized bed boiler tool
The arithmetic mean of instantaneous value for locating observed temperature is 860-870 DEG C, and the temperature measured in burner hearth at six coal feed points is respectively 835-845
DEG C, 850-860 DEG C, 890-900 DEG C, 895-905 DEG C, 855-865 DEG C and 830-840 DEG C, adjust six coal feed points coal-supplying amount
It is respectively 20-22%, 17-19%, 10-12%, 9-11%, 18-20% and 20-22% so that it is accounted for the percentage of total coal-supplying amount,
It is 1m relative to volume3Boiler hearth of circulating fluidized bed, total coal-supplying amount be 0.05-0.1t/h.
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| JPS60101414A (en) * | 1983-11-09 | 1985-06-05 | Ebara Corp | Operation of fluidized-bed combustion furnace |
| CN203123791U (en) * | 2013-03-04 | 2013-08-14 | 华北电力大学 | Regulation control system for sulfur dioxide emission concentration of circulating fluidized bed boiler |
| CN103925607B (en) * | 2014-04-16 | 2016-01-20 | 西安西热锅炉环保工程有限公司 | The pressurized direct pulverizing coal system controlled based on temperature section and control method thereof |
| CN203893195U (en) * | 2014-06-03 | 2014-10-22 | 曲靖云电投新能源发电有限公司 | Closed coal feeder of garbage incinerator of circulating fluid bed |
| CN105588122B (en) * | 2015-12-22 | 2018-02-13 | 山东中实易通集团有限公司 | A kind of fuel control method and system applied to CFBB |
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