CN1471999A - Multifluid alkaline fog generator smoke desulfuring method - Google Patents

Multifluid alkaline fog generator smoke desulfuring method Download PDF

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Publication number
CN1471999A
CN1471999A CNA031169872A CN03116987A CN1471999A CN 1471999 A CN1471999 A CN 1471999A CN A031169872 A CNA031169872 A CN A031169872A CN 03116987 A CN03116987 A CN 03116987A CN 1471999 A CN1471999 A CN 1471999A
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China
Prior art keywords
alkali
generator
suspension
desulfurizing agent
flue gas
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CN1194794C (en
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章明川
周月桂
范卫东
范浩杰
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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Publication of CN1194794C publication Critical patent/CN1194794C/en
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Abstract

A process for desulfurizing the fume by use of multi-fluid alkaline fog generator includes such steps as arranging one or more multi-fluid alkaline fog generators, introducing less hot fume or air and granular desulfurizing particles to it, collision activating to obtain wet alkaline fog of said desulfurizing agent, and continuously and uniformly mixing it with the fume in flue or reactor to remove SO2 from fume. Its advantages are simple system, high efficiency and low cost.

Description

The generator of alkali ne suspension fume desulphurization method
Technical field
What the present invention relates to is a kind of fume desulphurization method, and particularly a kind of generator of alkali ne suspension semidry method flue gas desulfurization method belongs to field of environment protection.
Background technology
The semidry method flue gas desulfurization method that present pulverized-coal fired boiler, Industrial Boiler or other combustion apparatus discharge sulfur dioxide in flue gas remove mainly contains spray drying FGD process, in-furnace calcium spraying and afterbody humidification activation doctor treatment and circulating fluid bed flue-gas desulfurizing, all adopts calcium-based desulfurizing agent (lime stone, lime, calcium hydroxide etc.) to carry out flue gas desulfurization.Spray drying FGD process has that system is simple, investment is lower, desulfurization product is advantages such as dry powder shape, non-wastewater discharge, but part obviously comes with some shortcomings, mainly contain: (1) is because the solubility of lime in water is low, must make lime milkiness slurries, its serum producing system is complicated and huge; (2) higher to the atomizer quality requirement, often density unevenness and the unequal factor of granularity because of lime slurry causes atomization badness, and can cause the obstruction and the wearing and tearing of atomizer.Be obstruction, the wearing and tearing that prevent atomizer, must adopt the high speed rotary-atomizing nozzle of special material; (3) lime slurry atomizing difficulty, the atomized drop particle diameter is big, desulphurization reaction speed low (with square being inversely proportional to of size droplet diameter), thereby cause absorption tower bulky (the flue gas design time of staying is more than 10 seconds), influence the further reduction and the application in existing power plant improvement project of desulphurization plant cost of investment.In-furnace calcium spraying and afterbody humidification activation flue gas desulfurization technique (LIFAC) are another kind of common semidry method flue gas desulfurization methods, but also have some problems: (1) is under the coal-powder boiler condition, the desulfurizing agent mass ratio of flying dust and adding in the flue gas is generally more than 10~20 times, to its mass ratio of high-ash fire coal even can be higher.A large amount of water droplets are absorbed by flying dust to exist a large amount of flying dusts and desulfurizing agent " to rob water " when adopting the work of water sprinkling for better material moisture activation in activated reactor, and the actual water calcium of desulfurizing agent mol ratio is very low, and the reactive desulfurizing agent activity is not high; (2) all flue gas is by activated reactor, and sorbent particle and water smoke are diluted greatly by flue gas, and its collisional activation efficient is lower, only is 25%~30%.Its result is that activated reactor is bulky equally, and desulfuration efficiency is difficult for improving.Through the retrieval of prior art is looked into newly, still find no bibliographical information so far with generator of alkali ne suspension fume desulphurization method same subject of the present invention.
Summary of the invention
The present invention is directed to deficiency of the prior art and defective, a kind of generator of alkali ne suspension fume desulphurization method has been proposed, make it simple and easy, compact, efficient, can effectively overcome or avoid serum producing system and a series of problems such as atomizer obstruction and wearing and tearing of conventional semi method fume desulphurization method complexity, and can increase substantially the collisional activation efficient of sorbent particle and water droplets and the reactivity and the desulfuration efficiency of desulfurizing agent, reduce the volume of desulfuration absorbing tower greatly.
The present invention is achieved by the following technical solutions, the inventive method is specific as follows: generator of alkali ne suspension is set, by water droplet and sorbent particle collisional activation under higher concentration of two-fluid spray nozzle atomizing, finish the online preparation of wet type desulfurizing agent alkali mist therein; Then, the wet type desulfurizing agent alkali mist of online preparation is mixed in the flue gas of boiler flue with certain time of staying or external reactor continuously equably, finishes the desulfurization rapidly reaction in flue or external reactor, removes sulfur in smoke.
Below the inventive method is further described:
1, one or more generator of alkali ne suspension is set, adopt the small amount of thermal flue gas or adopt air, enter generator of alkali ne suspension by air distributor, the desulfurizing agent injection that wherein a part of air quantity carries from feed bin enters generator of alkali ne suspension, make water droplet and sorbent particle collisional activation under higher concentration of two-fluid spray nozzle atomizing in it, the online wet type desulfurizing agent alkali mist of making.
2, generator of alkali ne suspension is connected on smoke canal elbow or other proper site, by means of the centrifugal action of the effect of main smoke airflow, smoke canal elbow with and the effect that helps jet mixing flow that is provided with of outlet, quickening wet type desulfurizing agent alkali mist is mixed in the flue gas of boiler flue or external reactor continuously, equably, the existence of sorbent particle surface moisture makes between sulfur dioxide gas and the sorbent particle ionic reaction takes place, and guarantees carrying out fast of the interior desulphurization reaction of follow-up flue.In boiler flue or external reactor, finish the desulfurization rapidly reaction of wet type desulfurizing agent, remove sulfur in smoke.
Adopt two-fluid spray nozzle atomizing clear water, can obtain superfine water droplets particle diameter, drip and have enough reaction table areas and desulphurization reaction speed to guarantee the desulfurizing agent slurry, and before entering deduster evaporate to dryness.Desulfurization duct adopts boiler flue or external reactor, to guarantee finishing desulphurization reaction greater than 1 second gas residence time.Structure and the flue gas flow concrete according to flue can be provided with one or more generator of alkali ne suspension.
It is the pulverized limestone of main component that desulfurizing agent adopts usually with calcium oxide or calcium hydroxide, and the form with solid-state calcium sulfate and calcium sulfite behind sulfur dioxide in flue gas and the reactive desulfurizing agent is stayed in the sorbent particle admittedly, and product is dry state.Flue gas after the desulfurization enters in the deduster, and desulfurization product and fly ash granule are collected by deduster, and wherein a part of particle optionally returns and desulfurizing agent mixing recycling, with further raising desulfuration efficiency and sorbent utilization.
The specific embodiment
From boiler back end ductwork, extract the small amount of thermal flue gas, enter alkaline spray generator by air distributor, the desulfurizing agent injection that wherein a part of air quantity carries from feed bin enters in the alkaline spray generator, with water droplet higher concentration collisional activation in alkaline spray generator of two-fluid spray nozzle atomizing, the online wet type desulfurizing agent slurry of making drips.Alkaline spray generator is connected on smoke canal elbow or other proper site, be mixed into continuously, equably in the flue gas of desulfurization duct by means of the centrifugal action of the effect of primary air, smoke canal elbow and effect that outlet helps jet mixing flow wet type desulfurizing agent alkali mist, in desulfurization duct, finish the desulfurization rapidly reaction of wet type desulfurizing agent at last online preparation in the alkaline spray generator.Flue gas after the desulfurization enters in the deduster, and desulfurization product, the sorbent particle and the fly ash granule of complete reaction are not collected by deduster, and wherein a part of particle optionally returns and desulfurizing agent mixing recycling.Wherein desulfurization duct can be the flue between boiler and the deduster, also can be newly-installed external reactor, carries out desulphurization reaction to guarantee the gas residence time greater than 1 second.Structure and the flue gas flow concrete according to desulfurization duct can be provided with one or more alkaline spray generators.
Substantive distinguishing features of the present invention and marked improvement are to prepare highly active desulfurization agent alkali mist by the online high concentration of generator of alkali ne suspension is set.Compare with spray drying FGD process, this method has fundamentally been avoided having removed complicated lime slurry preparation system simultaneously from owing to spray problems such as the obstruction of the atomizer that slurries cause and wearing and tearing, reactor be huge.Compare with conventional humidification activations such as LIFAC, this method because of avoided flying dust and desulfurizing agent and " robbed water " and water smoke and desulfurizing agent by flue gas dilution, the collisional activation efficient of sorbent particle and water droplets and the activity of desulfurizing agent have been improved greatly, increase substantially the utilization rate of smoke desulfurization efficiency and desulfurizing agent, reduced the volume of desulfurizer to greatest extent.Reaching under the identical smoke desulfurization efficiency, this sulfur method system is very simple, investment cost is extremely low, reliability is high and do not influence the operation of combustion apparatus, can reduce desulphurization plant investment cost and operating cost greatly.

Claims (7)

1, a kind of generator of alkali ne suspension fume desulphurization method, it is characterized in that method is specific as follows: generator of alkali ne suspension is set, in generator of alkali ne suspension,, finish the online preparation of wet type desulfurizing agent alkali mist by water droplet and sorbent particle collisional activation under higher concentration of two-fluid spray nozzle atomizing; Then, the wet type desulfurizing agent alkali mist of online preparation is mixed in the flue gas in boiler flue or the external reactor continuously equably, finishes the desulfurization rapidly reaction therein, removes sulfur in smoke.
2, this generator of alkali ne suspension fume desulphurization method according to claim 1 is characterized in that, below further qualification that method is done:
(1) from boiler back end ductwork, extracts a spot of hot flue gas or employing air, enter generator of alkali ne suspension by air distributor, the desulfurizing agent injection that wherein a part of air quantity carries from feed bin enters generator of alkali ne suspension, with the water droplet that atomizes in two-fluid spray nozzle collisional activation under the higher concentration in generator of alkali ne suspension, the online wet type desulfurizing agent alkali mist of making;
(2) generator of alkali ne suspension is connected on smoke canal elbow or other proper site, by means of the centrifugal action of the effect of primary air, smoke canal elbow with and the effect that helps jet mixing flow that is provided with of outlet, quickening wet type desulfurizing agent alkali mist is mixed in the flue gas in boiler flue or the external reactor continuously, equably, the existence of sorbent particle surface moisture makes between sulfur dioxide gas and the sorbent particle ionic reaction takes place, in boiler flue or external reactor, finish the desulfurization rapidly reaction of wet type desulfurizing agent, remove sulfur in smoke.
3, this generator of alkali ne suspension fume desulphurization method according to claim 1 and 2 is characterized in that, boiler is to flue that is provided with certain time of staying between the deduster or external reactor, and gas residence time was greater than 1 second.
4, this generator of alkali ne suspension fume desulphurization method according to claim 1 and 2, it is characterized in that, concrete structure and flue gas flow according to desulfurization duct are provided with one or more generator of alkali ne suspension, and generator of alkali ne suspension is connected on smoke canal elbow or other proper site.
5, this generator of alkali ne suspension fume desulphurization method according to claim 1 and 2, it is characterized in that, the drop particle diameter of two-fluid spray nozzle atomizing can adapt to the requirement of follow-up flue desulfurization rapidly reaction, desulfurizing agent slurry drips and has enough reaction table areas and desulphurization reaction speed, and before entering deduster evaporate to dryness.
6, this generator of alkali ne suspension fume desulphurization method according to claim 1 and 2, it is characterized in that, desulfurizing agent is for being the pulverized limestone of main component with calcium oxide or calcium hydroxide, form with solid-state calcium sulfate and calcium sulfite behind sulfur dioxide in flue gas and the reactive desulfurizing agent is stayed in the sorbent particle admittedly, and product is dry state.
7, this generator of alkali ne suspension fume desulphurization method according to claim 1 and 2, it is characterized in that, flue gas after the desulfurization enters in the deduster, and desulfurization reaction product and fly ash granule are collected by deduster, and wherein a part of particle optionally returns and desulfurizing agent mixing recycling.
CN 03116987 2003-05-16 2003-05-16 Multifluid alkaline fog generator smoke desulfuring method Expired - Fee Related CN1194794C (en)

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CN1194794C CN1194794C (en) 2005-03-30

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101721907B (en) * 2010-02-03 2011-09-28 上海交通大学 Flue gas desulfurizing method for W-shaped multi-fluid alkaline spray generator
CN101780370B (en) * 2010-02-03 2012-12-26 上海交通大学 Desulphurizing device based on internal circulation W type multi-fluid alkali fog generator and desulphurizing method
CN102989298A (en) * 2012-11-30 2013-03-27 浙江泰来环保科技有限公司 Acid-removing and desulfurizing device
CN106178877A (en) * 2016-08-31 2016-12-07 大连华锐重工集团股份有限公司 A kind of coke oven flue waste gas purification waste heat recovery apparatus and technique

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101721907B (en) * 2010-02-03 2011-09-28 上海交通大学 Flue gas desulfurizing method for W-shaped multi-fluid alkaline spray generator
CN101780370B (en) * 2010-02-03 2012-12-26 上海交通大学 Desulphurizing device based on internal circulation W type multi-fluid alkali fog generator and desulphurizing method
CN102989298A (en) * 2012-11-30 2013-03-27 浙江泰来环保科技有限公司 Acid-removing and desulfurizing device
CN102989298B (en) * 2012-11-30 2014-08-13 浙江泰来环保科技有限公司 Acid-removing and desulfurizing device
CN106178877A (en) * 2016-08-31 2016-12-07 大连华锐重工集团股份有限公司 A kind of coke oven flue waste gas purification waste heat recovery apparatus and technique

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