CN106000099A - Coal combustion system capable of realizing near zero emission of atmospheric pollutants - Google Patents
Coal combustion system capable of realizing near zero emission of atmospheric pollutants Download PDFInfo
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- CN106000099A CN106000099A CN201610602597.6A CN201610602597A CN106000099A CN 106000099 A CN106000099 A CN 106000099A CN 201610602597 A CN201610602597 A CN 201610602597A CN 106000099 A CN106000099 A CN 106000099A
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- coal burning
- atmosphere pollution
- zero release
- burning system
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
Abstract
The invention relates to the field of thermal power generation, and discloses a coal combustion system capable of realizing near zero emission of atmospheric pollutants. The coal combustion system comprises a boiler (10), a denitration device (30), a desulfurization device (70) and a flue gas exhaust cooling tower (90) which are arranged in sequence, wherein a combustor of the boiler (10) is an air gradation low-nitrogen combustor. According to the coal combustion system disclosed by the invention, the production of nitric oxide is controlled from the combustion source through the air gradation low-nitrogen combustor, denitration treatment of the denitration device and desulfurization treatment of the desulfurization device are combined, and meanwhile, a flue gas exhaust mode of the flue gas cooling tower is adopted, so that the near zero emission of the atmospheric pollutants can be effectively realized under the combined action of the denitration device, the desulfurization device and the flue gas cooling tower.
Description
Technical field
The present invention relates to field of thermal power, in particular it relates to the combustion of a kind of atmosphere pollution near-zero release
Coal measures is united.
Background technology
Along with the development of economic society, people's increasingly concern for the environment problem, for this for coal burning system,
The flue gas that boiler is discharged needs to process, the flue dust in flue gas after process, sulfur dioxide, nitrogen oxidation
The concentration of emission of the pollutant such as thing needs to meet the atmosphere pollutants emission standards (" thermal power plant of national regulation
Atmosphere pollutants emission standards GB13223-2011 ") just can discharge.
At present, in traditional coal burning system, it is to configure low NO by boiler, simultaneously low mostly
Nitrogen burner configuration SCR denitration system (typically arranges three layers of catalyst layer, wherein urges for standby for one layer
Agent layer) and combine desulphurization system and realize the pollutant such as low NOx, low sulfur dioxide discharge want
Ask.
But, although traditional coal burning system processes the air that disclosure satisfy that national regulation to boiler exhaust gas
Pollutant emission standard, but owing to current coal burning system mainly relying on low NO control nitrogen oxygen
The discharge of compound, and fact proved, the mode of this removing nitrogen oxides is inefficient, generally
30-50%, this can increase the weight of the burden of follow-up SCR denitration system, make the denitration efficiency of SCR not reach
80%, the proposition therefore required along with the higher environmental protection index of electricity power group, current fume treatment mode
Can not meet the demand that pollutant emission level reduces further.
Summary of the invention
It is an object of the invention to provide the coal burning system of a kind of atmosphere pollution near-zero release, this coal burning system
The concentration of dye thing discharge can be reduced further, it is achieved the near-zero release of atmosphere pollution.
To achieve these goals, the present invention provides the coal burning system of a kind of atmosphere pollution near-zero release,
Described coal burning system includes boiler, denitrification apparatus, desulfurizer and the exhaust cooling tower set gradually,
The burner of described boiler is the low NO of air classification.
Preferably, the first cleaner unit it is provided with between described denitrification apparatus and desulfurizer.
Preferably, described first cleaner unit is the dry electrostatic cleaner using high frequency electric source.
Preferably, described desulfurizer is limestone-gypsum desulfurizing tower, described limestone-gypsum desulfurizing tower
Including tower body and the spraying layer that is arranged in tower body, described spraying layer be provided above demister.
Preferably, the number of plies of described spraying layer is 4-6 layer.
Preferably, it is provided with the second cleaner unit between described limestone-gypsum desulfurizing tower and exhaust cooling tower.
Preferably, described dry electrostatic cleaner is four E field electrostatic precipitator, and described second cleaner unit is
One electric field wet cottrell.
Preferably, the exit of described boiler is provided with economizer.
Preferably, it is provided with air preheater between described denitrification apparatus and described first cleaner unit.
Preferably, it is characterised in that described denitrification apparatus is SCR denitration device.
The present invention controls nitrogen oxides by the low NO of air classification from the source (in stove) of burning
Volume of production (use air classification low NO, boiler export removal of nitrogen oxide efficiency can reach
To 70%), and combine the denitration process of denitrification apparatus (for example, it is possible to carried out by SCR denitration device
Denitration, denitration efficiency reaches 80%, say, that combine the low NO of air classification, nitrogen oxides
Concentration of emission can be down to 50mg/Nm3Below), the desulfurization of desulfurizer process, use smoke evacuation simultaneously
The fume exhausting type of cooling tower such that it is able to effectively realize atmospheric pollution under the common effect of above-mentioned each parts
The near-zero release of thing.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, with
Detailed description below is used for explaining the present invention together, but is not intended that limitation of the present invention.?
In accompanying drawing:
Fig. 1 is the coal burning system of the atmosphere pollution near-zero release of the detailed description of the invention offer of the present invention
Structural representation.
Description of reference numerals
10: boiler；20: economizer；
30: denitrification apparatus；40: air preheater；
50: the first cleaner units；60: air-introduced machine；
70: desulfurizer；71: spray thrower；
72: demister；80: the second cleaner units；
90: exhaust cooling tower.
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is described in detail.It should be appreciated that
Detailed description of the invention described herein is merely to illustrate and explains the present invention, is not limited to this
Bright.
In the present invention, in the case of illustrating on the contrary, the noun of locality of use as " upper and lower, left,
Right " typically refer to reference to upper and lower, left and right shown in the drawings；" inside and outside " refers to relative to each portion
The profile of part itself inside and outside.
Fume treatment mode based on coal burning system of the prior art can not meet pollutant emission level
The demand reduced further, the present invention provides a kind of concentration that can reduce dye thing discharge further and realizes
The coal burning system of the near-zero release of atmosphere pollution, is carried out this coal burning system hereinafter with reference to accompanying drawing in detail
Description.
Suitably with reference to Fig. 1, the atmosphere pollution near-zero release that the detailed description of the invention of the present invention provides
Coal burning system includes boiler 10, denitrification apparatus 30, desulfurizer 70 and the smoke evacuation cooling set gradually
Tower 90, the low NO that burner is air classification of described boiler 10.
Wherein, need to explain at this about air classification mentioned hereinabove.Concrete, at fire coal
In system, before coal dust after-flame, maintain a certain degree of reducing atmosphere in the flame downstream of low NO,
Being to control important measures of NO_x formation in stove further, this measure is also referred to as furnace air and divides
Level low-NO_x combustion technology.Furnace air classification low-NO_x combustion technology is that the mode of change tradition consentrated air supply will
Part combustion air from main burner region disconnecting out, is sent in stove by the spout above burner,
Form the pattern that air classification (OFA) burns in furnace height direction, classification wind is mainly used in the later stage
Coal dust and carbon monoxide after-flame, air classification matches with low NO, it is possible to decrease discharged nitrous oxides
About 50～70%.
The present invention controls nitrogen oxides by the low NO of air classification from the source (in stove) of burning
Volume of production (use air classification low NO, boiler export removal of nitrogen oxide efficiency can reach
To 70%), and combine the denitration process of denitrification apparatus 30 (for example, it is possible to pass through SCR denitration device
Carrying out denitration, denitration efficiency reaches 80%, say, that combine the low NO of air classification, nitrogen oxygen
Compound concentration of emission can be down to 50mg/Nm3Below), the desulfurization of desulfurizer 70 process, adopt simultaneously
Fume exhausting type with exhaust cooling tower 90 such that it is able to the most real under the common effect of above-mentioned each parts
The near-zero release of existing atmosphere pollution.
Wherein, exhaust cooling tower is chimney and cooling tower unites two into one (also referred to as nicotinic acids), cancels
Chimney, utilizes exhaust cooling tower 90 to discharge flue gas, it is to be understood that this exhaust cooling tower 90 is existing
Original heat sinking function, substitutes again the clean flue gas after smoke stack emission desulphurization and denitration etc. purifies, alleviates
Pollutant flooring concentration, reduces gypsum rain coverage, alleviates the impact of chimney white haze visual pollution.
Wherein, also it is a kind of important sources of atmosphere pollution due to dust, therefore to reduce further
The Air Pollutant Emission concentration of coal burning system, in the present embodiment, described denitrification apparatus 30 is with de-
The first cleaner unit 50 it is provided with between sulfur device 70.Described first cleaner unit 50 can have various ways,
As long as disclosure satisfy that the purpose of dedusting.
But, if the first cleaner unit 50 uses the electrostatic precipitator of power frequency supply, although also be able to reach
To the purpose of dedusting, but spark capture function is poor and reentrainment of dust is with anti-to use power frequency supply to be faced with
The problem of corona, and energy consumption is higher.It is therefore preferred that described first cleaner unit 50 is for using high frequency
The dry electrostatic cleaner of power supply, such as, dry type four E field electrostatic precipitator of high frequency electric source, dedusting is imitated
Rate, up to 99.85%, can be effectively improved spark frequency and control function, suppresses back corona phenomenon, and
Dust outlet concentration can be significantly reduced, it is ensured that flue dust low concentration discharges.
Concrete, described desulfurizer 70 is limestone-gypsum desulfurizing tower (wet desulphurization), described stone
Lime stone-desulfurization of gypsum tower includes tower body and the spraying layer 71 being arranged in tower body, described spraying layer 71
It is provided above demister 72.Wherein, the number of plies of described spraying layer 71 can be carried out according to practical situation
Determining, such as, the number of plies of described spraying layer 71 is 4-6 layer, it is preferable that the layer of described spraying layer 71
Number is 4 layers.
When wet desulphurization, the mist that desulfurizing tower produces in running does not contain only moisture, but also molten
Having sulphuric acid, sulfate, sulfur dioxide etc., therefore cleaned gas needed to remove before leaving desulfurizing tower
Mist, the present invention realizes except mist by arranging demister 72.
By increasing spraying layer in limestone-gypsum desulfurizing tower, and suitably adjust the angle of nozzle, with
Time demister 72 is set such that it is able to realizing desulfuration efficiency and be up to 99%, sulfur dioxide concentration can be down to
35mg/Nm3Hereinafter, desulfurization outlet droplet content is down to 50mg/Nm3Below.
In order to make the flue gas being emitted into air cleaner, therefore flue gas enter exhaust cooling tower 90 it
Before can carry out dedusting again, i.e. set between described limestone-gypsum desulfurizing tower and exhaust cooling tower 90
It is equipped with the second cleaner unit 80.Wherein, described second cleaner unit 80 is an electric field wet cottrell.
Therefore, the Inlet dust of the second cleaner unit 80 takes off at the first cleaner unit 50 and the collaborative of desulfurizer 70
Removing down, the efficiency of dust collection of the second cleaner unit 80 can reach more than 88%, so that dust concentration can be down to
5mg/Nm3Hereinafter, hydrargyrum concentration can be down to 0.03mg/Nm3Below.
Additionally, in order to cost-effective, enable maximizes the use, the exit of described boiler 10
It is provided with economizer 20, such that it is able to by economizer 20 recovery waste heat, it is true that economizer 20
While recovery waste heat, also reduce the exhaust gas temperature of flue gas, thus saved the energy, reduce cost.
In order to save the energy further, arrange free between described denitrification apparatus 30 and the first cleaner unit 50
Pre-device 40 (also referred to as air preheater), before air preheater 40 will enter boiler by its internal fin
Air preheat to uniform temperature, thus reduce energy expenditure.
Therefore, in the present invention, boiler uses air classification low-NO_x combustion technology (to remove 70% nitrogen oxidation
Thing) and to configure efficient SCR denitration device (removing 80% nitrogen oxides), efficient limestone-gypsum wet
Method desulfurizer (desulfuration efficiency 99%), and dry type four E field electrostatic precipitator (efficiency of dust collection 99.85%)
With wet cottrell (efficiency of dust collection 88%), reduce flue dust, sulfur dioxide, nitrogen oxygen to greatest extent
The concentration of emission of compound, hydrargyrum etc..
In sum, the coal burning system that the present invention provides can significantly reduce flue dust, sulfur dioxide, nitrogen oxygen
The concentration of emission of compound, hydrargyrum etc., it is achieved the concentration of emission of flue dust, sulfur dioxide, nitrogen oxides, hydrargyrum etc.
Respectively reach 5mg/Nm3、35mg/Nm3、50mg/Nm3、0.03mg/Nm3Hereinafter, so that greatly
The concentration of emission of gas pollutant can not only meet the special emission limit in key area of national Specification,
Control level less than gas turbine unit Air Pollutant Emission simultaneously.It addition, the discharging modes of the present invention
Take cooling tower fume exhausting type, fill up the blank of domestic nicotinic acids near-zero release technology.
The coal burning system of the atmosphere pollution near-zero release that the present invention provides can be widely applied to use coal
Transformation as the nicotinic acids thermal power plant of fuel, it is also possible to for newly-built nicotinic acids power station.This technology
Can reduce the Air Pollutant Emission concentration of coal-burning power plant to greatest extent, pollutant emission level is notable
It is better than gas turbine unit pollutant emission control level.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, but, the present invention does not limit
Detail in above-mentioned embodiment, in the technology concept of the present invention, can be to the present invention
Technical scheme carry out multiple simple variant, these simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technology described in above-mentioned detailed description of the invention is special
Levy, in the case of reconcilable, can be combined by any suitable means.In order to avoid need not
The repetition wanted, various possible compound modes are illustrated by the present invention the most separately.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as its
Without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. the coal burning system of an atmosphere pollution near-zero release, it is characterised in that described coal burning system
Including the boiler (10) set gradually, denitrification apparatus (30), desulfurizer (70) and smoke evacuation cooling
Tower (90), the low NO that burner is air classification of described boiler (10).
The coal burning system of atmosphere pollution near-zero release the most according to claim 1, its feature exists
In, it is provided with the first cleaner unit (50) between described denitrification apparatus (30) and desulfurizer (70).
The coal burning system of atmosphere pollution near-zero release the most according to claim 2, its feature exists
In, described first cleaner unit (50) is the dry electrostatic cleaner using high frequency electric source.
The coal burning system of atmosphere pollution near-zero release the most according to claim 3, its feature exists
In, described desulfurizer (70) is limestone-gypsum desulfurizing tower, described limestone-gypsum desulfurizing tower bag
Include tower body and the spraying layer (71) being arranged in tower body, being provided above of described spraying layer (71)
Demister (72).
The coal burning system of atmosphere pollution near-zero release the most according to claim 4, its feature exists
In, the number of plies of described spraying layer (71) is 4-6 layer.
The coal burning system of atmosphere pollution near-zero release the most according to claim 4, its feature exists
In, it is provided with the second cleaner unit (80) between described limestone-gypsum desulfurizing tower and exhaust cooling tower (90).
The coal burning system of atmosphere pollution near-zero release the most according to claim 6, its feature exists
In, described dry electrostatic cleaner is four E field electrostatic precipitator, and described second cleaner unit (80) is one
Electric field wet cottrell.
The coal burning system of atmosphere pollution near-zero release the most according to claim 1, its feature exists
In, the exit of described boiler (10) is provided with economizer (20).
The coal burning system of atmosphere pollution near-zero release the most according to claim 2, its feature exists
In, it is provided with air preheater (40) between described denitrification apparatus (30) and described first cleaner unit (50).
10. according to the coal-fired system of the atmosphere pollution near-zero release described in any one in claim 1-9
System, it is characterised in that described denitrification apparatus (30) is SCR denitration device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610602597.6A CN106000099A (en) | 2016-07-27 | 2016-07-27 | Coal combustion system capable of realizing near zero emission of atmospheric pollutants |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610602597.6A CN106000099A (en) | 2016-07-27 | 2016-07-27 | Coal combustion system capable of realizing near zero emission of atmospheric pollutants |
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| CN106000099A true CN106000099A (en) | 2016-10-12 |
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| CN201610602597.6A Pending CN106000099A (en) | 2016-07-27 | 2016-07-27 | Coal combustion system capable of realizing near zero emission of atmospheric pollutants |
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Cited By (4)
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| CN106621663A (en) * | 2016-12-13 | 2017-05-10 | 浙江嘉化能源化工股份有限公司 | Boiler flue gas treatment device and method |
| CN106765042A (en) * | 2016-12-05 | 2017-05-31 | 中国华能集团清洁能源技术研究院有限公司 | The coal fired power plant broad sense heat regenerative system and method for a kind of combination nature draught cooling tower |
| CN110090516A (en) * | 2019-04-28 | 2019-08-06 | 芜湖富春染织股份有限公司 | Printing and dyeing boiler smoke treatment process |
| CN111544971A (en) * | 2020-04-30 | 2020-08-18 | 南京赤博环保科技有限公司 | Gas low-nitrogen low-dust combustion purification method and system |
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| CN111544971A (en) * | 2020-04-30 | 2020-08-18 | 南京赤博环保科技有限公司 | Gas low-nitrogen low-dust combustion purification method and system |
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