CN106345267A - Method for flue gas desulfurization - Google Patents

Method for flue gas desulfurization Download PDF

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Publication number
CN106345267A
CN106345267A CN201610771500.4A CN201610771500A CN106345267A CN 106345267 A CN106345267 A CN 106345267A CN 201610771500 A CN201610771500 A CN 201610771500A CN 106345267 A CN106345267 A CN 106345267A
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flue gas
weight
polylactic acid
desulfurizing agent
desulfurization
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CN201610771500.4A
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Chinese (zh)
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林发绍
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温州乐享科技信息有限公司
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Priority to CN201610771500.4A priority Critical patent/CN106345267A/en
Publication of CN106345267A publication Critical patent/CN106345267A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81Solid phase processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases

Abstract

The invention belongs to the field of environment protection, and relates to a method for flue gas desulfurization. The method comprises the following steps: 1) mixing an oxygen-containing gas with a desulfurizer, and spraying into a desulfuration tower; 2) in the desulfuration tower, enabling fume to contact with the sprayed mixture at 100-220 DEG C, wherein a preparation method of the desulfurizer comprises the following steps: (1) mixing ferric oxide, ferrous sulfate, fluorite and magnesium chloride; (2) adding sodium borate and polylactic acid into the mixture obtained in the step (1), mixing at 130-160 DEG C, further culturing for 20-25 hours, drying, and roasting; (3) putting the roasted article obtained in the step (2) into polylactic acid of 160-200 DEG C, performing constant-temperature dipping, further drying, and cooling, thereby obtaining the desulfurizer. The method is relatively high in desulfurization efficiency and relatively good in economical efficiency.

Description

Method for flue gas desulfurization
Technical field
The invention belongs to field of Environment Protection is and in particular to a kind of method for flue gas desulfurization.
Background technology
Coal combustion or industry manufacture in the flue gas producing and often contain sulfide.Sulfide is mainly derived from coal or industry is former Expect the sulfur material containing, sulfur material reacts in combustion process or industrial manufacturing process, conversion sulphidisation discharges. Sulfide particularly hydrogen sulfide, sulfur dioxide etc. can frequently result in the catalyst poisoning inactivation producing in workshop section, and Containing Sulfur The waste gas of thing directly discharges, and easily pollutes environment, produces the air problem such as haze, has a strong impact on the health of the mankind.
Desulfurizing agent is a kind of medicament for removing sulfide in flue gas.Be conducive to industrial life due to reducing sulfide content Produce and environmental conservation, therefore researcher gives more concerns 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..Through research for many years, although desulfurizing agent species 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 still relatively low it is difficult to meet flue gas desulfurization to efficiency and The requirement of economy.
Still need at present a kind of economic, method of being efficiently used for flue gas desulfurization, to meet industry, civil area takes off to flue gas The urgent needss of sulfur.
Content of the invention
The inventors found that a kind of method for flue gas desulfurization, using prepared high sulfur capacity, high desulfurization essence The desulfurizing agent of degree, high transverse rupture strength and bigger serface, carries out desulfurization to flue gas, substantially increases desulfuration efficiency, and more For economical and practical.And, the desulfuration efficiency that the mixture of oxygen-containing gas and desulfurizing agent carries out desulfurization to flue gas at high temperature is higher.
The present invention relates to a kind of method for flue gas desulfurization, comprise the steps,
1) by oxygen-containing gas and desulphurizer mixing, and spray in desulfurizing tower;
2) in desulfurizing tower, flue gas is contacted at 100-220 DEG C with the mixture spraying into;Preferably, flue gas with spray into 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, 180 DEG C or Contact at 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) add sodium borate and polylactic acid in the mixture obtaining to step (1), mix at 130 DEG C -160 DEG C, then support Shield 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 obtaining step (2) puts into constant temperature dipping in 160-200 DEG C of polylactic acid, then dries, cools 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 200 DEG C of polylactic acid.
In the embodiment of any one of the present invention, step 1) 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 1) oxygen-containing gas be selected from the gaseous mixture of nitrogen and 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 2) in, described flue gas (in terms of sulfur dioxide in flue gas) with described In mixture, the weight of desulfurizing agent is than for 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 2) 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 2) in, the time of contact is 20 minutes -1.5 hours;It is preferably 20-30 minute, 40 minutes, 60 minutes or 90 minutes.
In the embodiment of any one of the present invention, step 2) in, described flue gas and mixture are in desulfurizing tower along phase negative side To flowing and contact.
In the embodiment of any one of the present invention, also include to step 2) process after the flue gas step that carries out dedusting;Excellent Selection of land, flue gas introducing cleaner unit is carried out dedusting.
In any embodiment of first aspect present invention, in step (3), the temperature of constant temperature dipping is poly- breast in step (3) The temperature of acid.
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, fluorite particle diameter be 600-1000 μm (preferably 600, 700th, 800,850,900 or 1000 μm).
In the embodiment of any one of the present invention, described ferrous sulfate, magnesium chloride particle diameter be 200-500 μm (preferably 200th, 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 and the mixture of ferrum oxide, ferrous sulfate, fluorite and magnesium chloride uniformly merge.
In the embodiment of any one of the present invention, the particle diameter of polylactic acid described in step (2) is 300-800 μm, 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, under sodium borate participates in (may be catalytic action), there is chemical change in polylactic acid.
In the embodiment of any one of the present invention, the addition of polylactic acid described in step (3) 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 When.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) For 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.
The beneficial effect that the present invention obtains:
1st, the method that the present invention is used for flue gas desulfurization, the Sulfur capacity of the desulfurizing agent of use is high, desulfurization precision is high, crushing strength High, specific surface area is big, thus improve efficiency and the economy of flue gas desulfurization.
2nd, the method that the present invention is used for flue gas desulfurization, the mixture of oxygen-containing gas and desulfurizing agent is carried out to flue gas at high temperature The desulfuration efficiency of desulfurization is higher.
3rd, the method that the present invention is used for flue gas desulfurization, the desulfurizing agent being used one of using polylactic acid as preparing raw material, improves The performance of desulfurizing agent.
4th, the method that the present invention is used for flue gas desulfurization, the desulfurizing agent of use, adds sodium borate, it is possible to increase poly- in the preparation The uniformity that lactic acid is merged with other raw materials, and sodium borate can promote polylactic acid that chemical change occurs in roasting process.
Specific embodiment
In order that present disclosure is more likely to be clearly understood, with reference to the present invention specific embodiment to this Bright be described in further detail, but specific embodiment itself does not cause limiting the scope of the invention.
Embodiment 1 prepares desulfurizing agent 1
By 400g ferrum oxide, 200g ferrous sulfate, 150g fluorite and 80g magnesium chloride mix homogeneously, magnesium chloride and sulphuric acid are sub- The particle diameter of ferrum is 200-400 μm, and the particle diameter of fluorite and ferrum oxide is 600-800 μm.50g boric acid is added in the mixture obtaining 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, dried with 160 DEG C, obtain 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 160 DEG C of 200g polylactic acid and impregnate 8 hours, then dry at 180 DEG C, cooling, obtain desulfurizing agent 1.Number-average molecular weight mn of the polylactic acid using is 1.5 × 105-2×105.
Embodiment 2 prepares desulfurizing agent 2
By 500g ferrum oxide, 280g ferrous sulfate, 180g fluorite and 120g magnesium chloride mix homogeneously, magnesium chloride and sulphuric acid are sub- The particle diameter of ferrum is 300-400 μm, and the particle diameter of fluorite and ferrum oxide is 700-900 μm.90g boric acid is added in the mixture obtaining Sodium and 100g polylactic acid, mix homogeneously at 140 DEG C -150 DEG C, 400-600 μm of the particle diameter of polylactic acid, then maintenance at 130 DEG C 23 hours, dried with 160 DEG C, then roasting 1 hour at 230 DEG C.The calcining matter obtaining is put into 160 DEG C of 300g polylactic acid Middle constant temperature impregnates 12 hours, then dries, cools down at 180 DEG C, obtains desulfurizing agent 2.Number-average molecular weight mn of the polylactic acid using is 1 ×105-1.5×105.
Embodiment 3 prepares desulfurizing agent 3
By 530g ferrum oxide, 350g ferrous sulfate, 200g fluorite and 140g magnesium chloride mix homogeneously, magnesium chloride and sulphuric acid are sub- The particle diameter of ferrum is 400-500 μm, and the particle diameter of fluorite and ferrum oxide is 900-1000 μm.130g boron is added in the mixture obtaining Sour sodium and 150g polylactic acid, mix homogeneously at 150 DEG C -160 DEG C, 700-800 μm of the particle diameter of polylactic acid, then support at 140 DEG C Shield 25 hours, is dried with 170 DEG C, then roasting 0.5 hour at 250 DEG C.The 450g that the calcining matter obtaining is put into 165 DEG C gathers In lactic acid, constant temperature impregnates 10 hours, then dries, cools down at 180 DEG C, obtains desulfurizing agent 3.The number-average molecular weight of the polylactic acid using Mn is 1.5 × 105-2×105.
Embodiment 4 fume desulphurization method of the present invention
200g desulfurizing agent 1 is mixed with 600l air phase, forms mixing logistics.By mixing logistics entering by desulfurizing tower top Material mouth sprays in desulfurizing tower, by content of sulfur dioxide be 2000mg/l, water content be 5% (w/w) thermal power plant flue gas 10l is passed through in the air inlet of desulfurization tower bottom.Temperature in desulfurizing tower is maintained at 100-130 DEG C, and flue gas is taking off with mixing logistics Flow in opposite direction in sulfur tower and keep to contact 30 minutes, flue gas is drawn by tower top gas outlet and sends into after cleaner unit dedusting, Collect to obtain gas 1.
Embodiment 5 fume desulphurization method of the present invention
The gaseous mixture of 200g desulfurizing agent 2 and 400l nitrogen and oxygen volume ratio 4:1 of oxygen (nitrogen) is mutually mixed, shape Resulting mixture stream.Mixing logistics is sprayed in desulfurizing tower by the feeding mouth on desulfurizing tower top, content of sulfur dioxide is 2500mg/ L, water content are that the flue gas 10l in the thermal power plant of 6% (w/w) is passed through in the air inlet of desulfurization tower bottom.Temperature in desulfurizing tower Degree is maintained at 150-170 DEG C, and flue gas flows in opposite direction in desulfurizing tower and keeps contacting 40 minutes with mixing logistics, by tower After ejection QI KOU is drawn flue gas and sent into dedusting in cleaner unit, collect to obtain gas 2.
Embodiment 6 fume desulphurization method of the present invention
400g desulfurizing agent 3 is mixed with 400l air phase, forms mixing logistics.By mixing logistics entering by desulfurizing tower top Material mouth sprays in desulfurizing tower, by content of sulfur dioxide be 2000mg/l, water content be 8% (w/w) thermal power plant flue gas 10l is passed through in the air inlet of desulfurization tower bottom.Temperature in desulfurizing tower is maintained at 190-220 DEG C, and flue gas is taking off with mixing logistics Flow in opposite direction in sulfur tower and keep to contact 60 minutes, flue gas is drawn by tower top gas outlet and sends into after dedusting in cleaner unit, 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 is 200-400 μm, and the particle diameter of fluorite and ferrum oxide is 600-800 μm, then maintenance 20 is little at 80-90 DEG C When, dried with 160 DEG C, 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
By 400g ferrum oxide, 200g ferrous sulfate, 150g fluorite and 80g magnesium chloride mix homogeneously, magnesium chloride and sulphuric acid are sub- The particle diameter of ferrum is 200-400 μm, and the particle diameter of fluorite and ferrum oxide is 600-800 μm.70g is added to gather breast in the mixture obtaining 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 at 230 DEG C roasting 2 hours, obtain calcining matter b.The polylactic acid using Number-average molecular weight mn is 1.5 × 105-2×105.
Comparative example 3
200g desulfurizing agent a is mixed with 600l air phase, forms mixing logistics.By mixing logistics entering by desulfurizing tower top Material mouth sprays in desulfurizing tower, by content of sulfur dioxide be 2000mg/l, water content be 5% (w/w) thermal power plant flue gas 10l is passed through in the air inlet of desulfurization tower bottom.Temperature in desulfurizing tower is maintained at 100-130 DEG C, and flue gas is taking off with mixing logistics Flow in opposite direction in sulfur tower and keep to contact 30 minutes, flue gas is drawn by tower top gas outlet and sends into after cleaner unit dedusting, Collect to obtain gas a.
Comparative example 4
By content of sulfur dioxide be 2000mg/l, water content be 5% (w/w) thermal power plant flue gas 10l be passed through de- In the air inlet of sulfur tower bottom, the desulfurizing agent 1 of embodiment 1 is sent in the desulfurizing agent entrance on desulfurizing tower top, desulfurizing tower simultaneously Interior temperature is maintained at 25-28 DEG C, and reverse flow in desulfurizing tower is mixed and kept contacting 30 minutes flue gas with desulfurizing agent, Drawn after dedusting by tower top gas outlet, collect to obtain gas b.
The desulfurization precision of experimental example 1 desulfurizing agent, Sulfur capacity and physical property
1st, desulfurization precision
Setting unstripped gas is containing 5000ppmh2The nitrogen of s, each 3g of desulfurizing agent 1-3, a of Example 1-3 and comparative example 1, Carry out multiple desulfurization test respectively between normal pressure (usually 1 atmospheric pressure), 10-45 DEG C, gas air speed is 2000h-1.
Finally record: under each temperature conditionss, after desulfurizing agent 1-3 process, outlet total sulfur is below unstripped gas 0.01ppm;After desulfurizing agent a process, outlet total sulfur is about 0.08ppm to unstripped gas.Therefore, the desulfurizing agent 1-3's of the present invention is de- Sulfur precision is higher than desulfurizing agent a.
2nd, 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 are evaluated and tested.Qualitative detection, can be certainly Join silver nitrate solution outlet sulfur is detected;Detection by quantitative, can be using domestic wk-2c synthesis Microcoulomb instrument (Jiangsu electroanalysis Instrument plant) detected, 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%
It can be seen that, the Sulfur capacity of inventive desulfurization agent 1-3 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 crushing strength of inventive desulfurization agent 1-3 and ratio Surface area is above desulfurizing agent a.
Experimental example 2: the uniformity of compound and the chemical change of calcining matter
1st, mixture uniformity
The compound a-b of embodiment 1, comparative example 2 is detected.
At random 10g is respectively taken as sample to compound a-b, with micro- sem observation it can be observed that: larger in compound b Granule (may be considered merge formed granule) substantially concentrate on central authorities, do not scatter;And it is larger in compound a sample Granule (may be considered merge formed granule) be all distributed in everywhere, dispersion is more uniform.Therefore, adding sodium borate has Help make polylactic acid equably merge with other raw materials, then it is observed that the bulky grain being fused into throughout is uniformly distributed.
2nd, calcining matter chemical change
To embodiment 1, the compound a-b of comparative example 2 and calcining matter a-b adopt nicolet company of the U.S. nexus 670 Type Fourier transformation infrared spectrometer is detected under similarity condition.It is found that: the infrared light of compound b and calcining matter b Spectrum is extremely approximate;The infrared spectrum difference of calcining matter a and compound a is larger, except the ester group absworption peak in calcining matter a spectrogram subtracts Weak outer, the infrared spectrum of calcining matter a 3 absworption peaks also more than the spectrogram of compound a.Interpolation sodium borate contributes to polylactic acid and exists There is chemical change in roasting process.
Experimental example 3: desulfuration efficiency
Measure dioxy in gas 1-3, the cumulative volume of gas a-b and each gas that 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 obtaining;
C is to collect content of sulfur dioxide (mg/l) in the gas obtaining;
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 using desulfurizing agent a for the comparative example 3, the present invention uses the method for desulfurizing agent 1-3 to take off Sulphur efficiency is higher.And, 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 Temperatures, flue gas connects at 100-220 DEG C with spraying into mixture Touch, the desulfuration efficiency of flue gas is higher.
Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.Right For those of ordinary skill in the art, can also make on the basis of the above description other multi-forms change or Change.There is no need to be exhaustive to all of embodiment.And the obvious change thus extended out or Change among still in the protection domain of the invention.

Claims (10)

1. a kind of method for flue gas desulfurization, comprises the steps,
1) by oxygen-containing gas and desulphurizer mixing, and spray in desulfurizing tower;
2) in desulfurizing tower, flue gas is contacted at 100-220 DEG C with the mixture spraying into;
Wherein, the preparation method of described desulfurizing agent comprises the steps:
(1) ferrum oxide, ferrous sulfate, fluorite and magnesium chloride are mixed;
(2) add sodium borate and polylactic acid in the mixture obtaining to step (1), mix at 130 DEG C -160 DEG C, then maintenance 20-25 hour, drying, roasting;
(3) calcining matter obtaining step (2) puts into constant temperature dipping in 160-200 DEG C of polylactic acid, then dries, cools down.
2. method according to claim 1, wherein, step 1) in, the consumption of described oxygen-containing gas is 1-3m3/ (kg desulfurization Agent).
3. method according to claim 1, wherein, step 2) in, flue gas (in terms of sulfur dioxide in flue gas) is mixed with described The weight of the desulfurizing agent in compound is than for 1:(1-20).
4. method according to claim 1, wherein, step 2) in, the water content of described flue gas is 5%-20% (w/w).
5. method according to claim 1, wherein, step 2) in, edge in desulfurizing tower is contrary with mixture for described flue gas Flow and contact in direction.
6. method 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.
7. method 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.
8. method according to claim 1, wherein, the drying temperature in step (2) and/or step (3) is 160-180 ℃.
9. method according to claim 1, wherein, sintering temperature is 200-250 DEG C.
10. 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.
CN201610771500.4A 2016-08-30 2016-08-30 Method for flue gas desulfurization CN106345267A (en)

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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
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CN102876286A (en) * 2012-09-25 2013-01-16 薛华 Compound high-efficiency desulfurizer
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Application publication date: 20170125