CN106281573A - method for burning coal - Google Patents
method for burning coal Download PDFInfo
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- CN106281573A CN106281573A CN201610772084.XA CN201610772084A CN106281573A CN 106281573 A CN106281573 A CN 106281573A CN 201610772084 A CN201610772084 A CN 201610772084A CN 106281573 A CN106281573 A CN 106281573A
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- flue gas
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- polylactic acid
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/10—Treating solid fuels to improve their combustion by using additives
-
- 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
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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
- B01D53/81—Solid phase processes
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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
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- 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
- B01D2251/402—Alkaline earth metal or magnesium compounds of magnesium
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/602—Oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/608—Sulfates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/70—Organic acids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2200/00—Components of fuel compositions
- C10L2200/02—Inorganic or organic compounds containing atoms other than C, H or O, e.g. organic compounds containing heteroatoms or metal organic complexes
- C10L2200/0272—Silicon containing compounds
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2200/00—Components of fuel compositions
- C10L2200/02—Inorganic or organic compounds containing atoms other than C, H or O, e.g. organic compounds containing heteroatoms or metal organic complexes
- C10L2200/029—Salts, such as carbonates, oxides, hydroxides, percompounds, e.g. peroxides, perborates, nitrates, nitrites, sulfates, and silicates
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Abstract
The invention belongs to energy field, relate to a kind of method for burning coal, comprise the steps, 1) coal, waterglass and calcium oxide are mixed, and burn；2) by oxygen-containing gas and desulphurizer mixing, mixture is obtained；3) by step 1) flue gas and the step 2 that produce) mixture contacts at 100 220 DEG C, then flue gas carried out dedusting；Wherein, the preparation method of desulfurizing agent comprises the steps: that ferrum oxide, ferrous sulfate, fluorite and magnesium chloride are mixed by (1)；(2) in the mixture that step (1) obtains, add sodium borate and polylactic acid, mix at 130 DEG C 160 DEG C, then maintenance 20 25 hours, dry, roasting；(3) calcining matter that step (2) obtains is put into constant temperature dipping in the polylactic acid of 160 200 DEG C, then dries, cool down.The inventive method effectively reduces flue and stains degree, decreases dust stratification amount, and smoke desulfurization efficiency is higher.
Description
Technical field
The invention belongs to energy field, be specifically related to a kind of method for burning coal.
Background technology
Being often accompanied by flue surface in coal combustion process and stain serious, the problem of a large amount of dust stratification of flue, this fires to boiler etc.
Cleaning and the maintenance work of burning equipment bring difficulty.Further, often containing sulfide in the flue gas that coal combustion produces.Sulfuration owner
The sulfur material that coal to be derived from or the raw material of industry contain, sulfur material reacts in combustion process or industrial manufacturing process,
Change into sulfide to discharge.Sulfide particularly hydrogen sulfide, sulfur dioxide etc. can frequently result in the catalysis produced in workshop section
Agent poisoning and deactivation, and the waste gas of sulfur compound directly discharges, and easily pollutes environment, produces the air problem such as haze, serious shadow
Ring the health of the mankind.
Desulfurizing agent is a kind of medicament for removing sulfide in flue gas.Be conducive to industry raw owing to reducing sulfide content
Producing and environmental conservation, therefore researcher gives more concern for the research and development of desulfurizing agent.Current desulfurizing agent kind includes
Solid base/liquid base desulfurizing agent, activated carbon desulphurization agent, molecular sieve carried metal desulfurization agent, Fe-series desulfurizing agent, manganese systems desulfurizing agent,
Many composite oxide of metal desulfurizing agent etc..Studying through for many years, although desulfurizing agent kind is more and more abundanter, desulfurization performance there has also been
Be greatly improved, but the Sulfur capacity of existing desulfurizing agent and desulfurization precision be the most relatively low, it is difficult to meet flue gas desulfurization to efficiency and
The requirement of economy.
One of still needing at present coal combustion process economic, efficient, to solve in coal-fired process, flue stains, a large amount of dust stratification is asked
Topic, and disclosure satisfy that industry, the civil area urgent needs to flue gas desulfurization.
Summary of the invention
The inventors found that a kind of method for burning coal, the method is by coal and waterglass, calcium oxide
Burn after mixing, reduce flue and stain and dust stratification degree；The method of the present invention uses high sulfur capacity, high desulfurization precision, height
Crushing strength and the desulfurizing agent of bigger serface, carry out desulfurization to flue gas, substantially increases desulfuration efficiency, and the most economical
Practical.Further, the desulfuration efficiency that the mixture of oxygen-containing gas and desulfurizing agent at high temperature carries out desulfurization to flue gas is higher.
The present invention relates to a kind of method for burning coal, comprise the steps,
1) coal, waterglass and calcium oxide are mixed, and burn；
2) by oxygen-containing gas and desulphurizer mixing, mixture is obtained；
3) by step 1) flue gas that produces of burning and step 2) mixture contact at 100-220 DEG C, then flue gas is entered
Row dedusting；Preferably, described flue gas and mixture 100-150 DEG C, 130-180 DEG C, 160-200 DEG C, 100 DEG C, 120 DEG C, 130
DEG C, 150 DEG C, 170 DEG C, contact at 180 DEG C or 200 DEG C；
Wherein, the preparation method of described desulfurizing agent comprises the steps:
(1) ferrum oxide, ferrous sulfate, fluorite and magnesium chloride are mixed；
(2) in the mixture that step (1) obtains, add sodium borate and polylactic acid, mix at 130 DEG C-160 DEG C, then support
Protect 20-25 hour, drying, roasting；Preferably, at 130-150 DEG C, 130 DEG C, 135 DEG C, 140 DEG C, 145 DEG C, 150 DEG C, 155 DEG C
Or mix at 160 DEG C；Preferably, curing time is 20 hours, 22 hours, 23 hours or 25 hours；
(3) calcining matter that step (2) obtains is put into constant temperature dipping in the polylactic acid of 160-200 DEG C, then dries, cool down i.e.
Can；Preferably calcining matter is put into 160-180 DEG C, 160 DEG C, 165 DEG C, 170 DEG C, 175 DEG C, 180 DEG C, 185 DEG C, 190 DEG C, 195 DEG C
Or constant temperature dipping in the polylactic acid of 200 DEG C.
In the embodiment of any one of the present invention, step 1) in, the weight ratio of coal, waterglass and calcium oxide is (80-
100): (2-9): (1-5)；It is preferably 80:2:9,100:9:5,90:3:1 or (90-100): (2-6): (1-3).
In the embodiment of any one of the present invention, step 1) in ignition temperature≤1500 DEG C, it is preferable that≤1200 DEG C ,≤
1000 DEG C or≤800 DEG C, more preferably 500 DEG C, 700 DEG C, 800 DEG C, 900 DEG C, 1000 DEG C, 1100 DEG C, 1200 DEG C or 1500 DEG C.
In the embodiment of any one of the present invention, step 1) burning carry out in the boiler.
In the embodiment of any one of the present invention, step 2) in, the consumption of described oxygen-containing gas is 1-3m3/ (kg desulfurization
Agent)；It is preferably 1-2m3/ (kg desulfurizing agent), 1m3/ (kg desulfurizing agent), 1.5m3/ (kg desulfurizing agent), 2m3/ (kg desulfurizing agent) or 3m3/
(kg desulfurizing agent).
In the embodiment of any one of the present invention, step 2) oxygen-containing gas selected from nitrogen and the gaseous mixture of oxygen, oxygen
With air；Preferably in gaseous mixture, the volume ratio of nitrogen and oxygen is (1-10): 1, more preferably 1:1,4:1,6:1,8:1 or 10:
1。
In the embodiment of any one of the present invention, step 3) in, described flue gas (in terms of sulfur dioxide in flue gas) is with described
In mixture, the weight ratio of desulfurizing agent is 1:(1-20)；Be preferably 1:(2-10), 1:(5-15), 1:1,1:8,1:10,1:15,1:
17 or 1:20.
In the embodiment of any one of the present invention, step 3) in, the water content of described flue gas is 5%-20% (w/w)；Excellent
Elect 8%-15% (w/w), 5% (w/w), 7% (w/w), 10% (w/w), 14% (w/w), 17% (w/w) or 20% (w/w) as.
In the embodiment of any one of the present invention, step 3) in, the time of contact is 20 minutes-1.5 hours；It is preferably
20-30 minute, 30 minutes, 40 minutes, 60 minutes or 90 minutes.
In the embodiment of any one of the present invention, step 3) in, described flue gas and mixture in desulfurizing tower along phase negative side
To flowing and contacting.
In the embodiment of any one of the present invention, step 3) in, the flue gas that burning is produced by air-introduced machine introduces in desulfurizing tower
Carry out desulfurization.
In the embodiment of any one of the present invention, step 3) in, flue gas is introduced cleaner unit and carries out dedusting.
In the embodiment of any one of the present invention, in step (3), the temperature of constant temperature dipping is the temperature of polylactic acid in step (3)
Degree.
In the embodiment of any one of the present invention, the addition of described ferrum oxide is 40-53 weight portion (preferably 40,50
Or 53 weight portions), the addition of described ferrous sulfate is 20-35 weight portion (preferably 20,28 or 35 weight portion), described fluorite
Addition be 15-20 weight portion (preferably 15,18 or 20 weight portion), the addition of described magnesium chloride is 8-14 weight portion
(preferably 8,12 or 14 weight portion).
In the embodiment of any one of the present invention, described ferrum oxide, the particle diameter of fluorite be 600-1000 μm (preferably 600,
700,800,850,900 or 1000 μm).
In the embodiment of any one of the present invention, described ferrous sulfate, the particle diameter of magnesium chloride be 200-500 μm (preferably
200,300,350,400 or 500 μm).
The ferrum oxide of above-mentioned particle diameter, ferrous sulfate, fluorite and magnesium chloride mixing are more uniform.
In the embodiment of any one of the present invention, the addition of described sodium borate is 5-13 weight portion (preferably 5,9 or 13
Weight portion), the addition of the described polylactic acid in step (2) is 7-15 weight portion (preferably 7,8,10 or 15 weight portion).
Sodium borate contributes to making polylactic acid uniformly merge with the mixture of ferrum oxide, ferrous sulfate, fluorite and magnesium chloride.
In the embodiment of any one of the present invention, described in step (2), the particle diameter of polylactic acid is 300-800 μm, is preferably
300 μm, 400 μm, 500 μm, 700 μm or 800 μm.The polylactic acid of this particle size range be more easy to ferrum oxide, ferrous sulfate, fluorite and
The mixture of magnesium chloride merges uniformly.
In the embodiment of any one of the present invention, the temperature of maintenance is 120-140 DEG C；Be preferably 120 DEG C, 130 DEG C, 135
DEG C or 140 DEG C.
In the embodiment of any one of the present invention, the drying temperature in step (2) and/or step (3) is 160-180 DEG C；
Preferably, the drying temperature in step (2) and/or step (3) is 160 DEG C, 165 DEG C, 170 DEG C or 180 DEG C.
The purpose dried in step (2) and/or step (3) is to reduce water content, and moisture mostlys come from raw material.
In the embodiment of any one of the present invention, sintering temperature is 200-250 DEG C；Be preferably 200 DEG C, 210 DEG C, 220 DEG C,
225 DEG C, 230 DEG C, 240 DEG C or 250 DEG C.
In the embodiment of any one of the present invention, roasting time is 0.5-2 hour, preferably 0.5,1,1.5 or 2 hours.
In roasting process, (may be for catalytic action), polylactic acid generation chemical change under sodium borate participates in.
In the embodiment of any one of the present invention, described in step (3), the addition of polylactic acid is 20-45 weight portion；Excellent
Elect 30-45 weight portion, 20 weight portions, 30 weight portions, 40 weight portions or 45 weight portions as.
In the embodiment of any one of the present invention, dip time is 8-12 hour；It is preferably 8 hours, 10 hours or 12 little
Time.Dipping makes polylactic acid carry out depth integration with ferrum oxide, ferrous sulfate, fluorite and magnesium chloride granules.
In the embodiment of any one of the present invention, number-average molecular weight Mn of the polylactic acid in step (2) and/or step (3)
It is 1 × 105～2 × 105；Preferably, number-average molecular weight Mn of the polylactic acid in step (2) and/or step (3) is 1 × 105、
1.5×105Or 2 × 105。
In the present invention,
Waterglass refers to water-soluble metasilicate salt, and its chemical formula is Na2SiO3·9H2O。
The beneficial effect that the present invention obtains:
1, the present invention is for the method for burning coal, burns, reduce cigarette after being mixed with waterglass, calcium oxide by coal
The contamination degree in road, decreases dust deposit in flue.
2, the present invention is in the method for burning coal, and flue gas is at high temperature entered by the mixture of oxygen-containing gas and desulfurizing agent
The desulfuration efficiency of row desulfurization is higher.
3, the present invention is for the method for burning coal, and the Sulfur capacity of the desulfurizing agent of use is high, desulfurization precision is high, crushing strength
High, specific surface area greatly, thus improves efficiency and the economy of flue gas desulfurization.
4, the present invention is for the method for burning coal, and the desulfurizing agent of use, using polylactic acid as preparing one of raw material, improves
The performance of desulfurizing agent.
5, the present invention is for the method for burning coal, and the desulfurizing agent of use adds sodium borate in the preparation, it is possible to increase poly-
The uniformity that lactic acid and other raw materials merge, and sodium borate can promote polylactic acid that chemical change occurs in roasting process.
Detailed description of the invention
In order to make present disclosure be more likely to be clearly understood, below in conjunction with the specific embodiment of the present invention to this
Bright it is described in further detail, but specific embodiment itself does not cause limiting the scope of the invention.
Embodiment 1 prepares desulfurizing agent 1
400g ferrum oxide, 200g ferrous sulfate, 150g fluorite and 80g magnesium chloride mix homogeneously, magnesium chloride and sulphuric acid is sub-
The particle diameter of ferrum be the particle diameter of 200-400 μm, fluorite and ferrum oxide be 600-800 μm.50g boric acid is added in the mixture obtained
Sodium and 70g polylactic acid, mix homogeneously at 130 DEG C-140 DEG C, the particle diameter of polylactic acid is 300-500 μm, then maintenance at 120 DEG C
20 hours, with 160 DEG C of drying, obtaining compound A, then compound A roasting 2 hours at 230 DEG C, obtain calcining matter A.Will
To calcining matter put into constant temperature in the 200g polylactic acid of 160 DEG C and impregnate 8 hours, then 180 DEG C of drying, cool down, obtain desulfurizing agent
1.Number-average molecular weight Mn of the polylactic acid used is 1.5 × 105-2×105。
Embodiment 2 prepares desulfurizing agent 2
500g ferrum oxide, 280g ferrous sulfate, 180g fluorite and 120g magnesium chloride mix homogeneously, magnesium chloride and sulphuric acid is sub-
The particle diameter of ferrum be the particle diameter of 300-400 μm, fluorite and ferrum oxide be 700-900 μm.90g boric acid is added in the mixture obtained
Sodium and 100g polylactic acid, mix homogeneously at 140 DEG C-150 DEG C, the particle diameter 400-600 μm of polylactic acid, then maintenance at 130 DEG C
23 hours, with 160 DEG C of drying, then roasting 1 hour at 230 DEG C.The calcining matter obtained is put into the 300g polylactic acid of 160 DEG C
Middle constant temperature impregnates 12 hours, then in 180 DEG C of drying, cooling, obtains desulfurizing agent 2.Number-average molecular weight Mn of the polylactic acid used is 1
×105-1.5×105。
Embodiment 3 prepares desulfurizing agent 3
530g ferrum oxide, 350g ferrous sulfate, 200g fluorite and 140g magnesium chloride mix homogeneously, magnesium chloride and sulphuric acid is sub-
The particle diameter of ferrum be the particle diameter of 400-500 μm, fluorite and ferrum oxide be 900-1000 μm.130g boron is added in the mixture obtained
Acid sodium and 150g polylactic acid, mix homogeneously at 150 DEG C-160 DEG C, the particle diameter 700-800 μm of polylactic acid, then support at 140 DEG C
Protect 25 hours, with 170 DEG C of drying, then roasting 0.5 hour at 250 DEG C.The 450g that the calcining matter obtained puts into 165 DEG C is gathered
In lactic acid, constant temperature impregnates 10 hours, then in 180 DEG C of drying, cooling, obtains desulfurizing agent 3.The number-average molecular weight of the polylactic acid used
Mn is 1.5 × 105-2×105。
Embodiment 4 present invention is for the method I of burning coal
10kg coal dust, 0.25kg waterglass and 1.125kg calcium oxide mix homogeneously are sent into boiler, and at 800-1100 DEG C
Lower burning 48 hours.The flue gas producing burning carries out damping, and then determining the content of sulfur dioxide in flue gas is 2000mg/
L, water content 5% (w/w).200g desulfurizing agent 1 is mixed mutually with 600L air, forms mixture.By mixture by desulfurizing tower
The feeding mouth in portion sprays in desulfurizing tower, is passed through in the air inlet bottom desulfurizing tower by the 10L flue gas after damping, the temperature in desulfurizing tower
Degree is maintained at 100-130 DEG C, and flue gas flows in opposite direction in desulfurizing tower with mixture and keeps contacting 30 minutes, by tower top
After gas outlet is drawn flue gas and sent into cleaner unit dedusting, collect to obtain gas 1.
Embodiment 5 present invention is for the method II of burning coal
10kg coal dust, 0.9kg waterglass and 0.5kg calcium oxide mix homogeneously are sent into boiler, and fires at 700-900 DEG C
Burn 48 hours.The flue gas producing burning carries out damping, then determines the content of sulfur dioxide in flue gas and is 2500mg/L, contains
The water yield 6% (w/w).The gaseous mixture (nitrogen, volume ratio 4:1 of oxygen) of 200g desulfurizing agent 2 with 400L nitrogen and oxygen is mixed mutually
Close, form mixture.Mixing logistics is sprayed in desulfurizing tower by the feeding mouth on desulfurizing tower top, the 10L flue gas after damping is led to
Entering in the air inlet bottom desulfurizing tower, the temperature in desulfurizing tower is maintained at 150-170 DEG C, flue gas and mixture edge in desulfurizing tower
Rightabout flows and keeps contacting 40 minutes, tower top gas outlet draw flue gas and send in cleaner unit after dedusting, collecting
Gas 2.
Embodiment 6 present invention is for the method III of burning coal
10kg coal dust, 0.34kg waterglass and 0.12kg calcium oxide mix homogeneously are sent into boiler, and at 1200-1500 DEG C
Lower burning 48 hours.The flue gas producing burning carries out damping, and then determining the content of sulfur dioxide in flue gas is 1500mg/
L, water content 8% (w/w).300g desulfurizing agent 3 is mixed mutually with 300L air, forms mixture.By mixture by desulfurizing tower
The feeding mouth in portion sprays in desulfurizing tower, is passed through in the air inlet bottom desulfurizing tower by the 10L flue gas after damping, the temperature in desulfurizing tower
Degree is maintained at 190-220 DEG C, and flue gas flows in opposite direction in desulfurizing tower with mixing logistics and keeps contacting 60 minutes, by tower
Eject QI KOU to draw flue gas and send in cleaner unit after dedusting, collect to obtain gas 3.
Comparative example 1 prepares desulfurizing agent A
400g ferrum oxide, 200g ferrous sulfate, 150g fluorite and 80g magnesium chloride are added 20g water mix homogeneously, magnesium chloride and
The particle diameter of ferrous sulfate be the particle diameter of 200-400 μm, fluorite and ferrum oxide be 600-800 μm, then maintenance 20 is little at 80-90 DEG C
Time, with 160 DEG C of drying, then roasting 2 hours at 230 DEG C, cool down calcining matter, obtain desulfurizing agent A.
Comparative example 2 prepares compound B and calcining matter B
400g ferrum oxide, 200g ferrous sulfate, 150g fluorite and 80g magnesium chloride mix homogeneously, magnesium chloride and sulphuric acid is sub-
The particle diameter of ferrum be the particle diameter of 200-400 μm, fluorite and ferrum oxide be 600-800 μm.The poly-breast of 70g is added in the mixture obtained
Acid, mix homogeneously at 130 DEG C-140 DEG C, the particle diameter of polylactic acid is 300-500 μm, then maintenance 20 hours at 120 DEG C, with
160 DEG C of drying, obtain compound B.By compound B roasting 2 hours at 230 DEG C, obtain calcining matter B.The polylactic acid used
Number-average molecular weight Mn is 1.5 × 105-2×105。
Comparative example 3
10kg coal dust, 0.25kg waterglass and 1.125kg calcium oxide mix homogeneously are sent into boiler, and at 800-1100 DEG C
Lower burning 48 hours.The flue gas producing burning carries out damping, and then determining the content of sulfur dioxide in flue gas is 2000mg/
L, water content 5% (w/w).200g desulfurizing agent A and 600L air is mixed mutually, forms mixture.By mixture by desulfurizing tower
The feeding mouth in portion sprays in desulfurizing tower, is passed through in the air inlet bottom desulfurizing tower by the 10L flue gas after damping, the temperature in desulfurizing tower
Degree is maintained at 100-130 DEG C, and flue gas flows in opposite direction in desulfurizing tower with mixture and keeps contacting 30 minutes, by tower top
After gas outlet is drawn flue gas and sent into cleaner unit dedusting, collect to obtain gas A.
Comparative example 4
10kg coal dust, 0.25kg waterglass and 1.125kg calcium oxide mix homogeneously are sent into boiler, and at 800-1100 DEG C
Lower burning 48 hours.The flue gas producing burning carries out damping, and then determining the content of sulfur dioxide in flue gas is 2000mg/
L, water content 5% (w/w).10L flue gas is passed through in the air inlet bottom desulfurizing tower, the desulfurizing agent 1 of embodiment 1 is sent into simultaneously
In the desulfurizing agent import on desulfurizing tower top, the temperature in desulfurizing tower is maintained at 25-28 DEG C, and flue gas and desulfurizing agent are inverse in desulfurizing tower
Carry out mixing and keep to contact 30 minutes to flowing, tower top gas outlet after drawing dedusting, collect to obtain gas B.
Comparative example 5
10kg coal dust is sent into boiler, and burns 48 hours at 800-1100 DEG C.
Desulfurization precision, Sulfur capacity and the physical property of experimental example 1 desulfurizing agent
1, desulfurization precision
Unstripped gas is set for containing 5000ppmH2The nitrogen of S, each 3g of desulfurizing agent 1-3, A of Example 1-3 and comparative example 1,
At normal pressure (usually 1 atmospheric pressure), carrying out repeatedly desulfurization test between 10-45 DEG C respectively, gas air speed is 2000h-1。
Finally recording: under each temperature conditions, unstripped gas is after desulfurizing agent 1-3 processes, and outlet total sulfur is below
0.01ppm；Unstripped gas is after desulfurizing agent A processes, and outlet total sulfur is about 0.08ppm.Therefore, the desulfurizing agent 1-3's of the present invention is de-
Sulfur precision is higher than desulfurizing agent A.
2, Sulfur capacity and physical property
Desulfurizing agent 1-3, A of Example 1-3 and comparative example 1 make sample, measure Sulfur capacity respectively.Take sample 100g, 10
DEG C-45 DEG C, under normal pressure (usually 1 atmospheric pressure), with containing H2S is that the Standard Gases of 40000ppm is evaluated and tested.Qualitative detection, can be certainly
Join silver nitrate solution outlet sulfur is detected；Detection by quantitative, can use domestic WK-2C comprehensive Microcoulomb instrument (Jiangsu electroanalysis
Instrument plant) detect, the detection limit of this instrument is 0.2ppm, and result is as shown in table 1.
Table 1
| Test event | Desulfurizing agent 1 | Desulfurizing agent 2 | Desulfurizing agent 3 | Desulfurizing agent A |
| Sulfur capacity | 78.6% | 81.5% | 82.0% | 45.3% |
Visible, the Sulfur capacity of the desulfurizing agent 1-3 that the inventive method obtains is far longer than desulfurizing agent A.
After measured, the crushing strength of inventive desulfurization agent 1-3 is more than 110N/cm, and specific surface area is 80-120m2/g；De-
The crushing strength of sulfur agent A is 40N/cm, and specific surface area is 50-60m2/g.The desulfurizing agent 1-3's that the inventive method obtains is anti-broken
Broken intensity and specific surface area are above desulfurizing agent A.
Experimental example 2: the uniformity of compound and the chemical change of calcining matter
1, mixture uniformity
The compound A-B of embodiment 1, comparative example 2 is detected.
The random 10g that respectively takes compound A-B, as sample, observes with microscope, it can be observed that: bigger in compound B
Granule (may be considered merge formed granule) substantially concentrate on central authorities, do not scatter；And it is bigger in compound A sample
Granule (may be considered merge formed granule) in the most all there being distribution, disperse the most uniform.Therefore, add sodium borate to have
Help make polylactic acid merge equably with other raw materials, then it is observed that the bulky grain being fused into is uniformly distributed throughout.
2, calcining matter chemical change
Compound A-B and calcining matter A-B to embodiment 1, comparative example 2 uses the Nexus 670 of Nicolet company of the U.S.
Type Fourier transformation infrared spectrometer detects under similarity condition.Found that: compound B and the infrared light of calcining matter B
Spectrum extremely approximates；The infrared spectrum difference of calcining matter A and compound A is relatively big, except the ester group absworption peak in calcining matter A spectrogram subtracts
Outside weak, the infrared spectrum of calcining matter A also spectrogram than compound A is many 3 absworption peaks.Interpolation sodium borate contributes to polylactic acid and exists
Roasting process occurs chemical change.
Experimental example 3: desulfuration efficiency
Dioxy in gas 1-3, the cumulative volume of gas A-B and each gas that mensuration embodiment 4-6 and comparative example 3-4 are collected
Change the content of sulfur, and calculate desulfuration efficiency according to the following formula, the results are shown in Table 2.
Desulfuration efficiency=100% × (V0×C0-V×C)/(V0×C0×t)
Wherein:
V is the cumulative volume (L) collecting the gas obtained；
C is to collect content of sulfur dioxide (mg/L) in the gas obtained；
V0Cumulative volume (L) for flue gas；
C0For sulfur dioxide in flue gas content (mg/L)；
T is desulfurization time (h).
Table 2
As shown in Table 2, compared with the method that comparative example 3 uses desulfurizing agent A, the present invention uses the method for desulfurizing agent 1-3 to take off
Sulphur efficiency is higher.Further, compared with comparative example 4, at high temperature flue gas is taken off with the mixture of oxygen-containing gas and desulfurizing agent
During sulfur, desulfuration efficiency is higher.
Inventor's test records, and compared with other Contact Temperature, flue gas connects at 100-220 DEG C with spraying into mixture
Touching, the desulfuration efficiency of flue gas is higher.
Experimental example 4: contamination and dust stratification amount
Embodiment 4-6 and comparative example 5 use same model boiler.
Observe being stained with of boiler flue (radial dimension of flue being identical with length) after embodiment 4-6 is burnt with comparative example 5
Dirty situation and dust stratification amount, the results are shown in Table 3.
Table 3
As shown in Table 3, compared to comparative example 5, the coal combustion process that the present invention adds waterglass and calcium oxide together burns is stained with
Dirty degree is lower, and dust stratification amount is less.
Obviously, above-described embodiment is only for clearly demonstrating example, and not restriction to embodiment.Right
For those of ordinary skill in the field, can also make on the basis of the above description other multi-form change or
Variation.Here without also cannot all of embodiment be given exhaustive.And the obvious change thus extended out or
Change among still in the protection domain of the invention.
Claims (10)
1., for a method for burning coal, comprise the steps,
1) coal, waterglass and calcium oxide are mixed, and burn；
2) by oxygen-containing gas and desulphurizer mixing, mixture is obtained；
3) by step 1) flue gas that produces of burning and step 2) mixture contact at 100-220 DEG C, then flue gas is removed
Dirt；
Wherein, the preparation method of described desulfurizing agent comprises the steps:
(1) ferrum oxide, ferrous sulfate, fluorite and magnesium chloride are mixed；
(2) in the mixture that step (1) obtains, add sodium borate and polylactic acid, mix at 130 DEG C-160 DEG C, then maintenance
20-25 hour, drying, roasting；
(3) calcining matter that step (2) obtains is put into constant temperature dipping in the polylactic acid of 160-200 DEG C, then dries, cool down.
Method the most according to claim 1, wherein, step 2) in, the consumption of described oxygen-containing gas is 1-3m3/ (kg desulfurization
Agent).
Method the most according to claim 1, wherein, step 3) in, flue gas (in terms of sulfur dioxide in flue gas) is mixed with described
The weight ratio of the desulfurizing agent in compound is 1:(1-20).
Method the most according to claim 1, wherein, step 3) in, the water content of described flue gas is 5%-20% (w/w).
Method the most according to claim 1, wherein, step 3) in, described flue gas is contrary with mixture edge in desulfurizing tower
Flow and contact in direction.
Method the most according to claim 1, wherein, the addition of described ferrum oxide is 40-53 weight portion, and described sulphuric acid is sub-
The addition of ferrum is 20-35 weight portion, and the addition of described fluorite is 15-20 weight portion, and the addition of described magnesium chloride is 8-
14 weight portions.
Method the most according to claim 1, wherein, the addition of described sodium borate is 5-13 weight portion, institute in step (2)
The addition stating polylactic acid is 7-15 weight portion.
Method the most according to claim 1, wherein, the drying temperature in step (2) and/or step (3) is 160-180
℃。
Method the most according to claim 1, wherein, sintering temperature is 200-250 DEG C.
10. according to the method according to any one of claim 1-9, wherein, described in step (3), the addition of polylactic acid is
20-45 weight portion.
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| JPS586233A (en) * | 1981-07-03 | 1983-01-13 | Mitsubishi Heavy Ind Ltd | Removing filter for gaseous sulfide |
| CN101397514A (en) * | 2007-09-30 | 2009-04-01 | 孟小平 | Quick-burning clean coal fines and method for producing the same |
| CN102327737A (en) * | 2011-06-22 | 2012-01-25 | 华北电力大学（保定） | Synergistic agent for flue gas desulfurization process adopting wet limestone-gypsum method and application thereof |
| CN202438257U (en) * | 2011-10-11 | 2012-09-19 | 盛尼克能源环保技术(重庆)有限公司 | Gas-solid circulating flue gas absorption desulfuration and dust removal device |
| CN102876286A (en) * | 2012-09-25 | 2013-01-16 | 薛华 | Compound high-efficiency desulfurizer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS586233A (en) * | 1981-07-03 | 1983-01-13 | Mitsubishi Heavy Ind Ltd | Removing filter for gaseous sulfide |
| CN101397514A (en) * | 2007-09-30 | 2009-04-01 | 孟小平 | Quick-burning clean coal fines and method for producing the same |
| CN102327737A (en) * | 2011-06-22 | 2012-01-25 | 华北电力大学（保定） | Synergistic agent for flue gas desulfurization process adopting wet limestone-gypsum method and application thereof |
| CN202438257U (en) * | 2011-10-11 | 2012-09-19 | 盛尼克能源环保技术(重庆)有限公司 | Gas-solid circulating flue gas absorption desulfuration and dust removal device |
| CN102876286A (en) * | 2012-09-25 | 2013-01-16 | 薛华 | Compound high-efficiency desulfurizer |
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