CN106402912A - Method for alleviating stains on flue heating surface of boiler and reducing acid dew point of flue gas - Google Patents
Method for alleviating stains on flue heating surface of boiler and reducing acid dew point of flue gas Download PDFInfo
- Publication number
- CN106402912A CN106402912A CN201610782909.6A CN201610782909A CN106402912A CN 106402912 A CN106402912 A CN 106402912A CN 201610782909 A CN201610782909 A CN 201610782909A CN 106402912 A CN106402912 A CN 106402912A
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- China
- Prior art keywords
- boiler
- flue
- flue gas
- heating surface
- limestone powder
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/20—Sulfur; Compounds thereof
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a method for alleviating stains on the flue heating surface of a boiler and reducing acid dew point of flue gas. The method comprises the following step of by introducing clean flue gas discharged from a boiler dedustor as a carrier, carrying superfine limestone powder and spraying the powder into an isothermal region in the boiler flue, wherein the superfine limestone powder is decomposed to generate CaO and absorbs SOx in the flue gas, the average grain diameter of the superfine limestone powder is 2.5-10[mu]m, and the isothermal region in the boiler flue is a smoke temperature region of 800-900 DEG C. According to the method disclosed by the invention, the superfine limestone powder and coal ash are separately fed into the boiler, so that the mixing amount of the superfine limestone powder can be regulated in real time according to tiny changes of coal so as to realize the optimum sulfur fixation effect; the superfine limestone powder can fully exert the action of limestone in the same mixing proportion, so that the powder is fully mixed with flue gas to efficiently absorb SOx so as to reduce a low-melting-point stain corrosion product generation speed, thereby achieving an effect of alleviating the stains of the heating surface. According to the method disclosed by the invention, existing equipment needs not to be greatly changed, added devices are convenient to mount, the structure is simple, the cost is low, and the operation is stable.
Description
Technical field
The present invention relates to field of boilers, more particularly, to one kind slow down boiler flue heating surface and staiing and reduces flue gas acid dew point
Method.
Background technology
Quasi- east coalfield finds the self-contained coalfield of maximum so far as China, and in its coal, alkali metal content is high, burned
The alkali metal evaporating in journey can on heating surface with flue gas in SO3Occur to stain corrosion, had a strong impact on this ature of coal and made
For burn application in boiler for the steam coal.In order to use this ature of coal in boiler on a large scale, it is to avoid or slow down high temperature corrosion
Phenomenon occurs, and needs to reduce SO in flue gas as far as possiblex(SO2And SO3) concentration, to stop the high-viscosity alkali metal sulphuric acid of low melting point
The generation of product, thus prevent heating surface from staiing the generation of corrosion.Existing research and production practices have been proposed for taking off in stove
Except SOxMethod, broken including being blended into lime stone in raw coal, then send into burner hearth in the lump, or flue gas imported to specially
Carry out dry desulfurization in the desulfurizing tower of door.However, the former lime stone is difficult to crush with coal dust mixing it is impossible to coal varitation
It is often more important that the particle diameter of lime stone and coal dust are close, lime stone specific surface area does not enable to maximize it is impossible to reach real-time regulation
To optimal desulfurized effect；The latter needs large-scale desulfurization reactor, system bulky complex, and investment for trnasforming urban land is big, operational management work
Measure many.Although two ways achieves certain desulfurized effect, desulfurized effect is not maximized, also not by production cost
Minimize.
Content of the invention
In view of the deficiencies in the prior art, the technical problem to be solved is to find one kind easily boiler flue
Sulfur method, improves heating surface and stains.
For achieving the above object, the invention provides one kind slows down boiler flue heating surface stains and reduce flue gas acid dew point
Method, by lime stone superfine powder, in boiler flue, 800～900 DEG C of cigarette warm areas spray into, and adjust the lime stone amount that sprays into full
The suitable calcium sulfur ratio condition of foot is so that the ultra-fine CaO particle after decomposition of limestone is able to fully mix rapidly with the SOx in flue gas
Close, reaction generates the CaSO that fusing point is up to 1450 DEG C4, thus realizing solid sulphur desulfurized effect, final realize improving heating surface stain,
Reduce flue gas acid dew point temperature effect.Specifically, the technical scheme that the present invention provides is as follows：
A kind of slow down the method that boiler flue heating surface stains and reduces flue gas acid dew point, draw boiler dust remover discharge clean
Neat stress is carrier, carries ultra-fine limestone powder and sprays into isothermal region in boiler flue so that ultra-fine limestone powder decomposes product
The SO in flue gas is absorbed after raw CaOx.
Preferably, the average grain diameter of ultra-fine limestone powder is 2.5～10 μm.
Preferably, in boiler flue, isothermal region is between 800～900 DEG C of cigarette warm areas.
Preferably, boiler is π type boiler, and in boiler flue, isothermal region is horizontal flue position.
Preferably, boiler is tower boiler or CFBB.
Preferably, the burner of boiler is DC burner or turbulent burner
What the present invention provided slow down boiler flue heating surface stains and reduces the method for flue gas acid dew point and have advantages below：
1st, super-fine limestone powder and coal dust separately enter stove, can be according to the slight change real-time monitoring ultra-fine limestone of ature of coal
Powder blending amount, realizes optimal captured sulfur result.
2nd, 2.5～10 μm about of ultra-fine limestone powder can give full play to lime stone under same mixing proportion
Effect, it is sufficiently mixed with flue gas, efficient absorption SOxStain corrosion product formation speed to reduce low melting point, reach alleviation and be subject to
The effect that hot face is stain.
3rd, change that need not be big to existing equipment, adding set is easy for installation, and structure is simple, with low cost, stable.
4th, it is applicable not only to DC burner, is also applied for turbulent burner, lime stone also can be blended into the side such as burnout degree
Formula participates in the solid sulphur of burner hearth.
5th, it is not only suitable for π type, SO in the boiler flue such as towerxRemoving, it may also be used in CFBB, to enter
One step strengthening SOxRemoval efficiency, and reduce recirculating fluidized bed internal heating surface abrasion.When height is used using recirculating fluidized bed mode
When alkali ature of coal or living beings, may also used to reduce flue gas acid dew point and slow down heating surface stain degree.
6th, application extension.The method of the present invention can be applied not only to the interpolation of ultra-fine limestone powder in boiler flue with
Absorb SOx, it may also be used for the addition of other particulate additives and gas, to realize desulfurization and denitration purpose.
Below with reference to accompanying drawing, the technique effect of the method for the present invention and generation is described further, to be fully understood from
The purpose of the present invention, feature and effect.
Brief description
Fig. 1 is that after the present invention draws deduster, clean flue gas carry ultra-fine limestone powder and spray into medium grade cigarette temperature area in flue
Schematic diagram
Specific embodiment
The method of the present invention is mainly included in and sprays into ultra-fine limestone powder, super-fine limestone powder between boiler medium grade cigarette warm area
The SO producing in CaO, with flue gas is decomposed, at 800～900 DEG C about, in endxReaction is to realize the purpose of efficiency of sulfur retention desulfurization.Ultra-fine
Limestone powder is entered at π type boiler horizontal gas pass position (or between 800～900 DEG C of cigarette warm areas of tower boiler) with certain flow.
Ultra-fine limestone powder is sprayed into and needs medium in stove and carry it is contemplated that being carried using the clean flue gas after deduster, this is
Because the dust content in flue gas after deduster is very low, it carries, and super-fine limestone powder is last will not to aggravate back-end surfaces
Abrasion.
The working method of the present invention is as follows：
As shown in figure 1, drawing the clean flue gas after a part of deduster, enter boiler flue to carry ultra-fine limestone powder
Between medium grade cigarette warm area, ultra-fine limestone absorbs the SO in flue gas after decomposing generation CaOx, form dystectic CaSO4, thus effectively
Reduce SO in flue gasxConcentration, slows down low melting point high viscosity low melting point and stains corrosion product generating rate such that it is able to effective alleviate
Heating surface stains corrosion, and effectively reduces flue gas acid dew point temperature.
By thermal conduction study and kinetics principle, particle diameter is less, and specific surface area is bigger, and desulfuration efficiency can substantially carry
High.Due to being that medium grade cigarette warm area sprays into ultra-fine limestone powder in boiler flue, change conventional lime stone and raw coal mixing
Grind broken mode together, so lime stone can individually grind thinner, the agstone of same quality has larger
Specific surface area, realizes more preferable desulfurized effect, and on the other hand, if CaO particle is too big, the sliding velocity and flue gas between can be very
Greatly, it is unfavorable for the generation of both desulphurization reactions, so ultra-fine CaO to be selected is to reduce the sliding velocity of itself and flue gas.
Add ash particle after burner hearth can aggravate the abrasion of heating surface different from thicker limestone particle, ultra-fine lime stone
Powder not only has bigger specific surface area, and the effect of attrition of heating surface is substantially reduced；Spray in view of in boiler flue
Enter super-fine limestone powder end and can increase deduster removing burden, therefore particle diameter of limestone powder is not more low better, because stone
Lime stone powder diameter is thinner, and broken lime stone power consumption not only can be led to increase, and also can greatly affect deduster trapping fine grained
Efficiency, leads to dust content discharge in flue gas not up to standard, therefore selects 2.5～10 μm about of limestone powder optimal.
Ultra-fine limestone powder is sprayed into and needs medium in stove and carry it is contemplated that being made using the clean flue gas after deduster
For carrying medium, this is because the dust content in flue gas after deduster is very low, it carries that super-fine limestone powder is last will not
The abrasion of aggravation back-end surfaces.
SO in CFBBxRemoving be also by add lime stone by way of realize, due to ciculation fluidized
Between bed reaction temperature is 800～900 DEG C, this temperature range is exactly the decomposition temperature of lime stone, so lime stone is usually used in following
Flue gas dry desulfurizing in ring fluid bed.But if ultra-fine limestone powder is sprayed into using this method, can further reinforcing desulfuration
Effect, and reduce limestone powder consumption, also can reduce the recirculating fluidized bed internal heating surface degree of wear.When adopting recirculating fluidized bed
When mode uses high-alkali ature of coal or living beings, may also used to reduce flue gas acid dew point and slow down heating surface stain degree.
The preferred embodiment of the present invention described in detail above.It should be appreciated that the ordinary skill of this area need not be created
The property made work just can make many modifications and variations according to the design of the present invention.Therefore, all technical staff in the art
Pass through the available technology of logical analysis, reasoning, or a limited experiment under this invention's idea on the basis of existing technology
Scheme, all should be in the protection domain being defined in the patent claims.
Claims (6)
1. a kind of boiler flue heating surface that slows down stains and reduces the method for flue gas acid dew point it is characterised in that drawing boiler dusting
The clean flue gas that device is discharged are carrier, carry ultra-fine limestone powder and spray into isothermal region in boiler flue so that ultra-fine limestone
Powder de-agglomeration absorbs the SO in flue gas after producing CaOx.
2. slow down the method that boiler flue heating surface stains and reduces flue gas acid dew point as claimed in claim 1, wherein said
The average grain diameter of ultra-fine limestone powder is 2.5～10 μm.
3. slow down the method that boiler flue heating surface stains and reduces flue gas acid dew point as claimed in claim 1, wherein said
In boiler flue, isothermal region is between 800～900 DEG C of cigarette warm areas.
4. slow down the method that boiler flue heating surface stains and reduces flue gas acid dew point as claimed in claim 1, wherein said
Boiler is π type boiler, and in described boiler flue, isothermal region is horizontal flue position.
5. slow down the method that boiler flue heating surface stains and reduces flue gas acid dew point as claimed in claim 1, wherein said
Boiler is tower boiler or CFBB.
6. slow down the method that boiler flue heating surface stains and reduces flue gas acid dew point as claimed in claim 1, wherein said
The burner of boiler is DC burner or turbulent burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610782909.6A CN106402912A (en) | 2016-08-30 | 2016-08-30 | Method for alleviating stains on flue heating surface of boiler and reducing acid dew point of flue gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610782909.6A CN106402912A (en) | 2016-08-30 | 2016-08-30 | Method for alleviating stains on flue heating surface of boiler and reducing acid dew point of flue gas |
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| Publication Number | Publication Date |
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| CN106402912A true CN106402912A (en) | 2017-02-15 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610782909.6A Pending CN106402912A (en) | 2016-08-30 | 2016-08-30 | Method for alleviating stains on flue heating surface of boiler and reducing acid dew point of flue gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107308808A (en) * | 2017-07-27 | 2017-11-03 | 广西农垦糖业集团红河制糖有限公司 | A kind of combustion gas furnace desulphurization system |
| CN108644763A (en) * | 2018-05-11 | 2018-10-12 | 清华大学 | A kind of circulating fluidized bed boiler and its operation method |
| WO2020055257A1 (en) * | 2018-09-14 | 2020-03-19 | Minplus B.V. | A method of operating an incinerator comprising a device for capturing ash entrained by flue gas |
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| CN1302683A (en) * | 2000-01-05 | 2001-07-11 | 浙江大学 | Two-segment desulfurizing method for high-temp combustion |
| CN101306305A (en) * | 2008-07-13 | 2008-11-19 | 兖矿国宏化工有限责任公司 | Fume eject-calcium desulfurizing techinique in pulverized coal fired boiler |
| CN101311628A (en) * | 2008-07-13 | 2008-11-26 | 兖矿国宏化工有限责任公司 | Circulating fluid bed boiler flue calcium injection and desulfurization process |
| CN101664632A (en) * | 2009-09-27 | 2010-03-10 | 济南市琦泉热电有限责任公司 | Desulfurization process for burning of mixing coal slime mixed with dolomite |
| JP2011110480A (en) * | 2009-11-25 | 2011-06-09 | Babcock Hitachi Kk | Exhaust gas treatment apparatus of oxygen combustion system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1302683A (en) * | 2000-01-05 | 2001-07-11 | 浙江大学 | Two-segment desulfurizing method for high-temp combustion |
| CN101306305A (en) * | 2008-07-13 | 2008-11-19 | 兖矿国宏化工有限责任公司 | Fume eject-calcium desulfurizing techinique in pulverized coal fired boiler |
| CN101311628A (en) * | 2008-07-13 | 2008-11-26 | 兖矿国宏化工有限责任公司 | Circulating fluid bed boiler flue calcium injection and desulfurization process |
| CN101664632A (en) * | 2009-09-27 | 2010-03-10 | 济南市琦泉热电有限责任公司 | Desulfurization process for burning of mixing coal slime mixed with dolomite |
| JP2011110480A (en) * | 2009-11-25 | 2011-06-09 | Babcock Hitachi Kk | Exhaust gas treatment apparatus of oxygen combustion system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107308808A (en) * | 2017-07-27 | 2017-11-03 | 广西农垦糖业集团红河制糖有限公司 | A kind of combustion gas furnace desulphurization system |
| CN108644763A (en) * | 2018-05-11 | 2018-10-12 | 清华大学 | A kind of circulating fluidized bed boiler and its operation method |
| CN108644763B (en) * | 2018-05-11 | 2024-04-09 | 清华大学 | Circulating fluidized bed boiler and operation method thereof |
| WO2020055257A1 (en) * | 2018-09-14 | 2020-03-19 | Minplus B.V. | A method of operating an incinerator comprising a device for capturing ash entrained by flue gas |
| CN112424530A (en) * | 2018-09-14 | 2021-02-26 | 敏普拉斯有限责任公司 | Method of operating an incineration plant of a plant comprising capture of flue gas entrained ash |
| CN112424530B (en) * | 2018-09-14 | 2024-03-05 | 敏普拉斯有限责任公司 | Method of operating an incineration plant comprising an apparatus for capturing ash entrained in flue gas |
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Application publication date: 20170215 |