CN109631064A - A method of utilizing calcium carbonate solid slag purification boiler sulfur dioxide in flue gas - Google Patents
A method of utilizing calcium carbonate solid slag purification boiler sulfur dioxide in flue gas Download PDFInfo
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- CN109631064A CN109631064A CN201811601307.1A CN201811601307A CN109631064A CN 109631064 A CN109631064 A CN 109631064A CN 201811601307 A CN201811601307 A CN 201811601307A CN 109631064 A CN109631064 A CN 109631064A
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- China
- Prior art keywords
- calcium carbonate
- slag
- flue gas
- coal
- solid slag
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- F23J7/00—Arrangement of devices for supplying chemicals to fire
-
- 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
Abstract
The invention discloses a kind of methods using calcium carbonate solid slag purification boiler sulfur dioxide in flue gas, method particularly includes: calcium carbonate solid slag and fine coal are measured respectively, then the two is sent into fluidized bed burner hearth after mixing and participates in burning and desulphurization reaction, with SO in purifying smoke2, fire box temperature controls in 850-970 DEG C of blowdown stack, while to SO in burner hearth2, calcium carbonate slag, fine coal additive amount carry out real-time monitoring, the present invention on realize solid wastes recycling utilize premised on, realize flue gas in SO2While qualified discharge, the operation and cost of investment of desulfurization environmental protecting device can be further decreased, has the advantages that environmentally protective, process short operation is simple, small investment, operation and maintenance cost is low, desulfuration efficiency is high.
Description
Technical field
The invention belongs to fluidized-bed combustion boiler filed of flue gas purification, and in particular to a kind of to utilize calcium carbonate solid slag purification boiler cigarette
The method of sulfur dioxide in gas.
Background technique
To protect environment, prevents and remedies pollution, promote boiler for producing operation, country limits the discharge of boiler pollutant
Value is required, according to emission standard of air pollutants for boilers GB13271-2014 requirement: SO2 is discharged in fire coal boiler fume
It is required that≤400mg/m3, currently, the prevailing technology technology of domestic flue gas desulfurization industrial applications, it is broadly divided into dry method and wet
Method desulfurization, the reactant and product of dry desulfurization are solid material, so there is no corrosion and scaling and wastewater treatments etc.
Problem has many advantages, such as the simple small investment of equipment, is widely used in boiler flue gas desulfurization field.
Lime stone is made by processes such as broken, milling powder processed using by the limestone of ore mining in conventional dry desulfurization
Powder, then nozzle sprays into boiler, realizes that the technical process of sulphur is consolidated in desulfurization.Dry desulfurizing process suffers from the drawback that first, from
The series of process processes such as limestone ore mining, broken, grinding flour, transport, packaging, long flow path process is more, and operating cost is high；The
Two, raw limestone limestone ore mining process be easy to cause soil erosion, bio-diversity to destroy and cut into a mountain caused by pit
Geological disaster etc., while lime stone be easy to cause dust and noise pollution in the process such as broken, grinding flour, third,
Conventional dry desulfurization uses limestone for raw material, and in addition to containing ingredients calcium carbonate in component, content is generally on 60% -70% left side
The right side, while it being also mixed with other impurities ingredient, so agstone one side consumption is big, on the other hand spray into together close in furnace
30%-40%'s absorbs pulverized coal friring heat without contribution component and then drags down fire box temperature, to guarantee that fire box temperature must be increase accordingly
Coal feeding amount causes boiler energy consumption and cost of material higher, and excessive agstone exacerbates burner hearth erosion process in flue gas, simultaneously
The processing load for increasing postorder flue gas ash removal process, increases device day-to-day operation cost and maintenance cost；4th, lime stone
Powder needs to add driven fan and provides pressure head, sprays into burner hearth by nozzle, there are agstones in burner hearth in actual moving process
Fluidisation " blind area " is sprayed into, the problem for sufficiently causing desulfuration efficiency lower cannot be mixed with coal dust, since high speed agstone is to fluffy
Mouth abrasion, higher to its material and structural requirement, the cycle of operation is shorter, increases device day-to-day operation maintenance cost.
In use Phosphate Fertilizer Nitrate with Frozen Method process unit while output nitrophosphate fertilizer product, raw material ammonia in technical process
During being ammonium nitrate for conversion of calcium nitrate with carbon dioxide, calcium ion and carbon dioxide generation are acted on, and generate calcium carbonate slag
Solid waste, chemical equation:
The CaCO of generation3By filtering, separating, become Phosphate Fertilizer Nitrate with Frozen Method device by-product calcium carbonate slag, CaCO3Content
70-98%, partial size are less than or equal to 50 μm of accountings 85%, and purposes can be used for manufacture of cement, or stack as solid slag environmental protection, by
It is that chemical reaction generates in its generation process, partial size is thinner, and solid slag scene fugitive dust is serious, it is necessary to using humidification depositing dust or adopt
With closed yard, Environmental Inputs are larger, therefore by-product CaCO3The recycling of solid slag is a kind of trend.
Summary of the invention
In order to overcome the deficiencies of the prior art, the present invention, which provides, a kind of utilizes titanium dioxide in calcium carbonate solid slag purification boiler flue gas
The method of sulphur, the present invention is premised on realizing that solid wastes recycling utilizes, the SO in realizing flue gas2It, can be with while qualified discharge
The operation and cost of investment of desulfurization environmental protecting device are further decreased, with environmentally protective, process short operation is simple, small investment, fortune
The advantage that row maintenance cost is low, desulfuration efficiency is high.
The purpose of the present invention is what is be achieved through the following technical solutions:
A method of using calcium carbonate solid slag purification boiler sulfur dioxide in flue gas, calcium carbonate solid slag and fine coal are carried out respectively
Metering, then the two is sent into fluidized bed burner hearth after mixing and participates in burning and desulphurization reaction, with SO in purifying smoke2, burner hearth
Temperature is controlled in 850-970 DEG C of blowdown stack, while to SO in burner hearth2, calcium carbonate slag, fine coal additive amount supervised in real time
It surveys.
Further, before the calcium carbonate slag and fine coal premix, addition magnitude relation between calcium carbonate slag and fine coal be with
Lower formula:
Wherein:: calcium carbonate slag additive amount；: calcium sulfur ratio；: coal sulfur content；: participate in the powder of burning
Coal amount；: CaCO in calcium carbonate slag3Content；: Margin coefficient.
Further, in above-mentioned formula in calcium carbonate slag calcium carbonate contentFor 70%-98%, calcium sulfur ratio
Between 1.2-3, it is contemplated that the factors such as different technology and operating conditionFor 1.1-4, coal sulfur contentAccording to coal
Depending on the type of kind, consider that the balance of balance removal efficiency and economy is selected≤ 1% coal.
After the present invention is blended uniformly using Phosphate Fertilizer Nitrate with Frozen Method device by-product calcium carbonate slag and raw material fine coal, it is sent into stream
Change bed, reaction process are as follows:
Fine coal is in fluidized-bed combustion boiler, and the low-temperature burning within the scope of 850-950 DEG C, calcium carbonate slag is thermally decomposed into CaO first, so
CaO is inside burner hearth and SO afterwards2Above-mentioned reaction occurs, finally by SO2The solid matter for being converted into inertia stable state is purified from gas phase
It separates.
In the present invention addition of desulfurizing agent be on demand by the control of calcium carbonate slag microcomputer can on-demand adjust automatically online,
And with SO in boiler emission chimney2Content is associated adjustment automatically, and matches with fine coal dosage, and the adjustment of additive amount can be with
By adjusting the amount of allocating of frequency converter frequency control calcium carbonate slag, to SO in calcium carbonate slag amount of allocating, flue gas2Content and frequency conversion letter
Number etc. parameters be monitored, pass through SO in metering and weighing device Real-time Feedback and flue gas2Content and setting amount of allocating to control and
Amount of allocating is adjusted, the closed circuit control and regulation of supplying of calcium carbonate slag are carried out, realizes that amount of allocating is stablized accurately, the conventional dry that compares is de-
Desulfurizing agent of sulfur supplying control is more accurate, is not in calcium carbonate slag supplying fluctuation, causes postorder pipeline erosion or separation
Device fluctuation of operating conditions, consumption of raw materials is less, operation and maintenance cost is lower.
The supplying control setting of calcium carbonate slag of the invention automatically and manual switching, to be cut from as under emergency rating
Dynamic state, controls amount of allocating by manually setting conversion frequencies.
Beneficial effects of the present invention:
(1) desulfurizing agent is compared more traditional using the by-product calcium carbonate solid slag of Phosphate Fertilizer Nitrate with Frozen Method device in the present invention
Lime building stones, effective component CaCO3Content is high, and the big reactivity of desulfurizing agent partial size small specific surface product is good, and desulfuration efficiency is high；Cause
For without reprocessing powder processed, so operating cost substantially reduces without dust noise pollution, compare conventional lime building stones desulfurizing agent
With good economic benefit and social benefit；
(2) inventive desulfurization agent and fine coal are to premix before desulphurization during combustion, the conventional desulfurizing agent that compares separated with fine coal separately through
Nozzle is incorporated boiler furnace and participates in desulphurization during combustion, and there is desulfurizing agent and fine coal to be uniformly dispersed in burner hearth, adds carbonic acid calcium grain
Diameter is small, large specific surface area, and pulverized coal friring carries out simultaneously with calcium carbonate desulphurization reaction, and desulfuration efficiency is high, and conventional desulfurization is not present
When agent is sprayed by spray head, under the disturbance of burner hearth fluid air flow, there are desulfurizing agent flow field blind area, SO in flue gas2It is not exposed to
Desulfurizing agent and short circuit escape, cause blowdown stack discharge it is exceeded, without nozzle etc. easily consumption component and pipeline be arranged, operation and maintenance expense
With comparing, conventional dry desulfurization is substantially reduced.
Specific embodiment
Technical solutions according to the invention are clearly and completely described below in conjunction with embodiment, it is clear that described
Embodiment be only a part of the embodiments of the present invention, instead of all the embodiments, based on the embodiments of the present invention, this
Field those of ordinary skill every other embodiment obtained without creative efforts, belongs to the present invention
The range of protection.
A method of using calcium carbonate solid slag purification boiler sulfur dioxide in flue gas, calcium carbonate solid slag and fine coal are distinguished
It is measured, then the two is sent into fluidized bed burner hearth after mixing and participates in burning and desulphurization reaction, with SO in purifying smoke2,
Fire box temperature is controlled in 850-970 DEG C of blowdown stack, while to SO in burner hearth2, calcium carbonate slag, fine coal additive amount carry out it is real-time
Monitoring.
Further, before the calcium carbonate slag and fine coal premix, addition magnitude relation between calcium carbonate slag and fine coal be with
Lower formula:
Wherein:: calcium carbonate slag additive amount；: calcium sulfur ratio；: coal sulfur content；: participate in the powder of burning
Coal amount；: CaCO in calcium carbonate slag3Content；: Margin coefficient.
The content of calcium carbonate in calcium carbonate slagFor 70%-98%, calcium sulfur ratioBetween 1.2-3, it is contemplated that
The factors such as different technology and operating conditionFor 1.1-4, consider that the balance of balance removal efficiency and economy is selected≤
1% coal.
Using effect case: the steam copper of this group hot-water boiler of newly-built two 20t/h and two 20t/h in 2003
Furnace heats to living area, and it is 130 DEG C that hot-water boiler, which designs maximum water temperature, and the specified system water pressure of highest is 1.25MPa；It steams
Boiler furnace nominal steam pressure is 1.25MPa, and nominal steam temperature is 194 DEG C.
According to emission standard of air pollutants for boilers GB13271-2014, it is necessary to change to existing boiler desulfurization system
It makes, makes during SO2 discharge reaches 400mg/m3 hereinafter, carrying out on a steam boiler of my company using method of the invention
Examination, the effect having had received, SO2 can be controlled in 300mg/m3 hereinafter, in March, 2017, Beijing Tianjin and Hebei Region prevention and control of air pollution work
The important instruction made must realize that minimum discharge and SO2 discharge reach 200mg/m3 hereinafter, through 2017 to 2018 Heating Periods
Test, in the case where not influencing boiler operatiopn, SO2 discharge annual average entirely reaches 200mg/m3 or less.
The present invention was proved by 2017 to 2018 winter heating periods, was consolidated using of the invention using Nitro Phosphate Unit
Method of the slag resource utilization to purify SO2 in fluidized-bed combustion boiler flue gas, low in cost, small investment economizes on resources, and has reached super
Low row requires, and has received good economic and social benefit.
Claims (3)
1. a kind of method using calcium carbonate solid slag purification boiler sulfur dioxide in flue gas, which is characterized in that method particularly includes: it will
Calcium carbonate solid slag and fine coal are measured respectively, and then the two is sent into fluidized bed burner hearth participation burning after mixing and desulfurization is anti-
It answers, with SO in purifying smoke2, fire box temperature controls in 850-970 DEG C of blowdown stack, while to SO in burner hearth2, calcium carbonate slag, powder
The additive amount of coal carries out real-time monitoring.
2. a kind of method using calcium carbonate solid slag purification boiler sulfur dioxide in flue gas according to claim 1, special
Sign is that before the calcium carbonate slag and fine coal premix, the addition magnitude relation between calcium carbonate slag and fine coal is following formula:
Wherein:: calcium carbonate slag additive amount；: calcium sulfur ratio；: coal sulfur content；: participate in the powder of burning
Coal amount；: CaCO3 content in calcium carbonate slag；: Margin coefficient.
3. a kind of method using calcium carbonate solid slag purification boiler sulfur dioxide in flue gas according to claim 2, special
Sign is, in the formula in calcium carbonate slag calcium carbonate contentFor 70%-98%, calcium sulfur ratioFor 1.2-3 it
Between,For 1.1-4, coal sulfur contentDepending on the type of coal,≤1%。
Priority Applications (1)
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| CN201811601307.1A CN109631064A (en) | 2018-12-26 | 2018-12-26 | A method of utilizing calcium carbonate solid slag purification boiler sulfur dioxide in flue gas |
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| CN201811601307.1A CN109631064A (en) | 2018-12-26 | 2018-12-26 | A method of utilizing calcium carbonate solid slag purification boiler sulfur dioxide in flue gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110018280A (en) * | 2019-05-17 | 2019-07-16 | 北京市环境保护科学研究院 | A kind of atmosphere pollution source emission comprehensive characterization method and device |
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| CN101797468A (en) * | 2010-04-20 | 2010-08-11 | 杭州恩内泽科技有限公司 | Method for desulfurating coal slime fluidized bed boiler by utilizing papermaking white mud and black liquor |
| CN102068898A (en) * | 2010-12-04 | 2011-05-25 | 宁夏大学 | Composite calcium-based solid desulfurizer and production method thereof |
| CN103197549A (en) * | 2013-03-04 | 2013-07-10 | 华北电力大学 | Soft measurement method and optimal control method of sulfur dioxide in circulating fluidized bed boiler smoke |
| 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 |
| CN205026702U (en) * | 2015-10-14 | 2016-02-10 | 中国天楹股份有限公司 | Full desulfurization system of calcium carbonate |
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2018
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| CN101797468A (en) * | 2010-04-20 | 2010-08-11 | 杭州恩内泽科技有限公司 | Method for desulfurating coal slime fluidized bed boiler by utilizing papermaking white mud and black liquor |
| CN102068898A (en) * | 2010-12-04 | 2011-05-25 | 宁夏大学 | Composite calcium-based solid desulfurizer and production method thereof |
| CN103197549A (en) * | 2013-03-04 | 2013-07-10 | 华北电力大学 | Soft measurement method and optimal control method of sulfur dioxide in circulating fluidized bed boiler smoke |
| 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 |
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