CN106122993A - A kind of coal combustion process of clean environment firendly - Google Patents
A kind of coal combustion process of clean environment firendly Download PDFInfo
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- CN106122993A CN106122993A CN201610771162.4A CN201610771162A CN106122993A CN 106122993 A CN106122993 A CN 106122993A CN 201610771162 A CN201610771162 A CN 201610771162A CN 106122993 A CN106122993 A CN 106122993A
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- flue gas
- mixture
- desulfurizing agent
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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
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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
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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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
- F23J2215/00—Preventing emissions
- F23J2215/20—Sulfur; Compounds thereof
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- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention belongs to energy field, relate to the coal combustion process of a kind of clean environment firendly, including, coal, waterglass and calcium oxide are mixed and burns；By oxygen-containing gas and desulphurizer mixing, obtain mixture；The flue gas that burning produces is contacted at 100 220 DEG C with mixture, and to flue gas ash removal.Desulfurizing agent preparation method includes, soluble iron saline solution and poly butylene succinate is mixed；In mixture, add urea liquid, more slowly add sodium bicarbonate solution, reach 6.8 7.5 to pH value；By the material that obtains 120 160 DEG C, react 13 hours under 0.10 0.20MPa；The precipitation granule settled out mixes with binding agent, pore creating material, dries, roasting in oxygen-containing atmosphere；The calcining matter obtained is put into constant temperature dipping in 120 200 DEG C of poly butylene succinates, then dries, cool down.Degree is low, dust stratification amount is few, smoke desulfurization efficiency is high, more clean environment firendly for the contamination of the method flue.
Description
Technical field
The invention belongs to energy field, be specifically related to the coal combustion process of a kind of clean environment firendly.
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 the coal combustion process of a kind of clean environment firendly, 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 increase desulfuration efficiency.The fire coal of the present invention
Method clean environment firendly, economical and practical.Further, the mixture of oxygen-containing gas and desulfurizing agent at high temperature carries out desulfurization to flue gas and takes off
Sulphur efficiency is higher.
The present invention relates to the coal combustion process of a kind of clean environment firendly, 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) soluble iron saline solution and poly butylene succinate are mixed；In mixture, add urea liquid, then delay
Slow addition sodium bicarbonate solution also mixes, until pH value reaches 6.8-7.5 (preferable ph is 7-7.5,7 or 7.5)；Preferably,
The mode being slowly added to is for dropwise to instill；
(2) material that step (1) is obtained 120-160 DEG C, react 1-3 hour under the conditions of 0.10-0.20MPa, sedimentation
It is precipitated granule；Preferably, 120-140 DEG C, react 3 hours under 0.10-0.12MPa；Preferably, subsidence style is for standing
Sedimentation；
(3) described precipitation granule is mixed with binding agent, pore creating material, dries, then roasting in oxygen-containing atmosphere；
(4) calcining matter that step (3) obtains is put into constant temperature dipping in the poly butylene succinate of 120-200 DEG C, then
Dry, cool down；Preferably calcining matter is put into 120-160 DEG C, 120 DEG C, 130 DEG C, 140 DEG C, 150 DEG C, 160 DEG C, 170 DEG C,
Constant temperature dipping in the poly butylene succinate of 180 DEG C, 190 DEG C or 200 DEG C.
In the course of reaction of step (2), poly butylene succinate is fused into precipitation with the FeOOH granule of generation
Granule.In step (4), dipping makes poly butylene succinate and FeOOH granule carry out depth integration.
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 (4), the temperature of constant temperature dipping is poly-succinic fourth in step (4)
The temperature of diol ester.
In the embodiment of any one of the present invention, described soluble iron saline solution is soluble iron saline solution.
In the embodiment of any one of the present invention, the addition of described soluble iron saline solution is that 100-200 weight portion is (excellent
Elect 100,140,160,200 weight portions as), described in step (1), the addition of poly butylene succinate is 7-15 weight portion
(preferably 7,9,13,15 weight portions).
In the embodiment of any one of the present invention, the weight percentage of soluble ferric iron salt in described soluble iron saline solution
For 40-60% (preferably 40%, 50% or 60%)；Preferably, any in ferric nitrate and iron chloride of soluble ferric iron salt
One or more.
In the embodiment of any one of the present invention, described in step (1), the particle diameter of poly butylene succinate is 200-800
μm, preferably 200-500 μm, 200 μm, 300 μm, 400 μm, 500 μm, 700 μm or 800 μm.The poly-succinic of this particle size range
The FeOOH granule that butanediol ester is more easy to and generates merges.
In the embodiment of any one of the present invention, described urea liquid is aqueous solution of urea.
In the embodiment of any one of the present invention, the molar concentration of described urea liquid is 0.01-1mol/L, is preferably
0.01-0.2mol/L, 0.1mol/L, 0.2mol/L, 0.4mol/L, 0.7mol/L, 0.8mol/L or 1mol/L.
In the embodiment of any one of the present invention, described sodium bicarbonate solution is sodium bicarbonate aqueous solution.
In the embodiment of any one of the present invention, the molar concentration of described sodium bicarbonate solution is 0.1-0.5mol/L, excellent
Elect 0.1-0.3mol/L, 0.1mol/L, 0.2mol/L, 0.3mol/L, 0.4mol/L or 0.5mol/L as.
In the embodiment of any one of the present invention, the addition of described urea liquid is 6-13 weight portion, preferably 6-10
Weight portion, 6-8 weight portion, 6 weight portions, 7 weight portions, 8 weight portions, 9 weight portions, 10 weight portions, 10.5 weight portions, 11 weight
Part, 12 weight portions or 13 weight portions.
In the embodiment of any one of the present invention, the drying temperature in step (3) and/or step (4) is 130-160 DEG C,
Preferably, the drying temperature in step (3) and/or step (4) is 130 DEG C, 140 DEG C, 150 DEG C or 160 DEG C.
The purpose dried in step (3) and/or step (4) is to reduce water content, and moisture mostlys come from raw material.
In the embodiment of any one of the present invention, the sintering temperature in step (3) is 200-250 DEG C；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 the embodiment of any one of the present invention, the addition of the described poly butylene succinate in step (4) is 20-
50 weight portions；It is preferably 30-45 weight portion, 20 weight portions, 30 weight portions, 40 weight portions, 45 weight portions or 50 weight portions.
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.
In the embodiment of any one of the present invention, the addition of described binding agent is 5-10 weight portion, preferably 5-8 weight
Part, 5 weight portions, 6 weight portions, 7 weight portions, 8 weight portions, 9 weight portions or 10 weight portions；The addition of described pore creating material is 1-3
Weight portion, preferably 1 weight portion, 2 weight portions or 3 weight portions.
In the embodiment of any one of the present invention, it is any that described binding agent is selected from bentonite, kieselguhr and Kaolin
One or more.
In the embodiment of any one of the present invention, described pore creating material in wood dust and graphite powder any one or many
Kind.
In the embodiment of any one of the present invention, oxygen-containing atmosphere is oxygen and the gaseous mixture of nitrogen or air；Preferably, mixed
Closing in gas, oxygen is (1-9) with the volume ratio of nitrogen: (9-1), more preferably (2-8): (8-2), 2:8,3:7,4:6 or 5:5.
In the embodiment of any one of the present invention, poly butylene succinate described in step (1) and/or step (4)
Number-average molecular weight Mn is 1 × 105～2 × 105；Preferably, poly butylene succinate described in step (1) and/or step (4)
Number-average molecular weight Mn be 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 coal combustion process of the present invention, burns after being mixed with waterglass, calcium oxide by coal, reduces the contamination of flue
Degree, decreases dust deposit in flue, more clean environment firendly.
2, in the coal combustion process of the present invention, the mixture of oxygen-containing gas and desulfurizing agent at high temperature carries out desulfurization to flue gas
Desulfuration efficiency is higher.
3, the coal combustion process of the present invention, uses the Sulfur capacity height of desulfurizing agent, desulfurization precision height, crushing strength height, specific surface
Long-pending big, thus improve efficiency and the economy of flue gas desulfurization.
4, the coal combustion process of the present invention, the desulfurizing agent of use, using poly butylene succinate as preparing one of raw material, carries
The high performance of desulfurizing agent.
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
1000g, the ferric chloride solution of 60% (w/w) and 70g poly butylene succinate are mixed, poly-succinic acid-butanediol
The particle diameter of ester is 200-400 μm, and number-average molecular weight Mn is 1 × 105～1.2 × 105.60g, 0.8mol/L is added in mixture
Urea liquid, more slowly the most dropwise instill 0.1mol/L sodium bicarbonate solution and stir, until solution ph reaches 6.8.Will
To material put in reactor, 120-140 DEG C, react 3 hours under the conditions of 0.10-0.12MPa, standing sedimentation is precipitated
Granule.Isolated precipitation granule is mixed homogeneously with 50g bentonite, 10g wood dust, dries at 130-140 DEG C, then at sky
In 200-210 DEG C of roasting 2 hours in gas atmosphere, obtain calcining matter.The calcining matter obtained is put into the poly-fourth of liquid of 120-130 DEG C
In succinate adipate, constant temperature impregnates 8 hours, then dries at 130-140 DEG C, and cooling obtains desulfurizing agent 1.
Embodiment 2 prepares desulfurizing agent 2
1600g, the iron nitrate solution of 50% (w/w) and 130g poly butylene succinate are mixed, poly-succinic fourth two
The particle diameter of alcohol ester is 500-700 μm, and number-average molecular weight Mn is 1.5 × 105～2 × 105.In mixture add 100g,
The urea liquid of 0.2mol/L, more dropwise instill 0.4mol/L sodium bicarbonate solution and stir, until solution ph reaches
7.The material obtained is put in reactor, 140-160 DEG C, react 3 hours under the conditions of 0.10-0.12MPa, standing sedimentation obtains
To precipitation granule.Isolated precipitation granule is mixed homogeneously with 70g kieselguhr, 20g wood dust, dries at 150-160 DEG C,
Again in 230-240 DEG C of roasting 2 hours in air atmosphere, obtain calcining matter.The calcining matter obtained is put into the liquid of 140-150 DEG C
In state poly butylene succinate, constant temperature impregnates 12 hours, then dries at 150-160 DEG C, and cooling obtains desulfurizing agent 2.
Embodiment 3 prepares desulfurizing agent 3
2000g, the ferric chloride solution of 40% (w/w) and 150g poly butylene succinate are mixed, poly-succinic fourth two
The particle diameter of alcohol ester is 700-800 μm, and number-average molecular weight Mn is 1.5 × 105～2 × 105.In mixture add 130g,
The urea liquid of 0.05mol/L, more dropwise instill 0.5mol/L sodium bicarbonate solution and stir, until solution ph reaches
7.5.The material obtained is put in reactor, 120-140 DEG C, react 3 hours under 0.10-0.12MPa, standing sedimentation obtains
Precipitation granule.Isolated precipitation granule is mixed homogeneously with 100g kieselguhr, 30g wood dust, dries at 150-160 DEG C,
Again in 240-250 DEG C of roasting 2 hours in air atmosphere, obtain calcining matter.The calcining matter obtained is put into the liquid of 140-150 DEG C
In state poly butylene succinate, constant temperature impregnates 8 hours, then dries at 150-160 DEG C, and cooling obtains desulfurizing agent 3.
The coal combustion process I of embodiment 4 present invention
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.
The coal combustion process II of embodiment 5 present invention
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.
The coal combustion process III of embodiment 6 present invention
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
To 1000g, 60% (w/w) ferric chloride solution in add the urea liquid of 60g, 0.8mol/L and mix mutually, then delay
Slow dropwise instillation 0.1mol/L sodium bicarbonate solution also stirs, until solution ph reaches 6.8.The material obtained is put into reaction
In still, 120-140 DEG C, react 3 hours under the conditions of 0.10-0.12MPa, standing sedimentation is precipitated granule.By isolated
Precipitation granule is mixed homogeneously with 50g bentonite, 10g wood dust, dries at 130-140 DEG C, then in 200-in air atmosphere
210 DEG C of roastings 2 hours, cooling obtains desulfurizing agent A.
Comparative example 2
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 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).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 entrance 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 4
10kg coal dust is sent into boiler, and burns 48 hours at 800-1100 DEG C.
Experimental example 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,
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.
Experimental example 2 Sulfur capacity
Desulfurizing agent 1-3, A of Example 1-3 and comparative example 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 | 80.1% | 79.3% | 81.7% | 49.8% |
Visible, the Sulfur capacity of the desulfurizing agent 1-3 that the inventive method obtains is far longer than desulfurizing agent A.
Experimental example 3 physical property
After measured, the crushing strength of inventive desulfurization agent 1-3 is more than 110N/cm, and specific surface area is 90-140m2/g；De-
The crushing strength of sulfur agent A is 50N/cm, and specific surface area is 50-70m2/g.The resistant to breakage that the inventive method obtains desulfurizing agent is strong
Degree and specific surface area are all higher than desulfurizing agent A.
Experimental example 4 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 2-3 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 2 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 3, 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 5 contamination and dust stratification amount
Embodiment 4-6 and comparative example 4 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 4
Dirty situation and dust stratification amount, the results are shown in Table 3.
Table 3
As shown in Table 3, compared to comparative example 4, 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. a coal combustion process for clean environment firendly, comprises 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) soluble iron saline solution and poly butylene succinate are mixed；In mixture, add urea liquid, more slowly add
Enter sodium bicarbonate solution and mix, until pH value reaches 6.8-7.5；
(2) material that step (1) is obtained 120-160 DEG C, react 1-3 hour under the conditions of 0.10-0.20MPa, sedimentation obtains
Precipitation granule；
(3) described precipitation granule is mixed with binding agent, pore creating material, dries, then roasting in oxygen-containing atmosphere；
(4) calcining matter that step (3) obtains is put into constant temperature in the poly butylene succinate of 120-200 DEG C impregnate, then dry,
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 soluble iron saline solution is 100-200 weight portion,
The addition of the described poly butylene succinate in step (1) is 7-15 weight portion.
Method the most according to claim 1, wherein, the addition of described urea liquid is 6-13 weight portion.
Method the most according to claim 1, wherein, the drying temperature in step (3) and/or step (4) is 130-160
℃。
Method the most according to claim 1, wherein, the sintering temperature in step (3) is 200-250 DEG C.
10. according to the method according to any one of claim 1-9, wherein, poly butylene succinate described in step (4)
Addition is 20-50 weight portion.
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| CN101874968A (en) * | 2009-12-31 | 2010-11-03 | 中北大学 | Iron complex desulfurizer suitable for super-gravity desulfurization |
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