CN101264418A - Pre-cooling recycling semi-dry process desulfurization dust-removing technique - Google Patents

Pre-cooling recycling semi-dry process desulfurization dust-removing technique Download PDF

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Publication number
CN101264418A
CN101264418A CNA2008100602481A CN200810060248A CN101264418A CN 101264418 A CN101264418 A CN 101264418A CN A2008100602481 A CNA2008100602481 A CN A2008100602481A CN 200810060248 A CN200810060248 A CN 200810060248A CN 101264418 A CN101264418 A CN 101264418A
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China
Prior art keywords
dust
flue gas
cooling
temperature
semi
Prior art date
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Pending
Application number
CNA2008100602481A
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Chinese (zh)
Inventor
李文勇
葛介龙
舒英钢
周钓忠
张永
张佩芳
李卫忠
崔盈
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Zhejiang Feida Environmental Science and Technology Co Ltd
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Zhejiang Feida Environmental Science and Technology Co Ltd
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Application filed by Zhejiang Feida Environmental Science and Technology Co Ltd filed Critical Zhejiang Feida Environmental Science and Technology Co Ltd
Priority to CNA2008100602481A priority Critical patent/CN101264418A/en
Publication of CN101264418A publication Critical patent/CN101264418A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a semi dry process desulfuration dedust craft of firstly pre-cooling and then circulation, in sequence comprising steps such as pre-cooling, acidity gas absorption, dust dedust, absorbent moistening recirculation. The invention has the advantages of firstly pre-cooling and then circulation desulfuration dedust of flue gas, reducing the addition of adding the circulation ash by back drop, improving the adding of the circulation ash and the working conditions of the moistening system, avoiding the phenomenon of shell clingage and fouling and nonuniform mixing produced by the adding of large amount of moistening water, reducing the running resistance of the system and the energy consumption in service, reducing the specific resistance of the dust in flue gas by pre-moistening the flue gas before desulfuration reaction, improving the dust collection efficiency, reducing the running load of the back drop dedusting equipment because of the great reducing of the dust into the back drop dedusting equipment (dust collector), and prolonging the service life of the dedusting equipment.

Description

The semi-dry desulphurization dust collecting process that a kind of elder generation lowers the temperature in advance and recycles
[technical field]
The present invention relates to a kind of environmental protection dust collecting process, relate in particular to a kind of improved semi-dry desulphurization dust collecting process.
[technical background]
Existing cyclic semidry process desulfurization and dedusting all is the alkaline circulating ash that add a large amount of humidifications in reactor (or reaction tower), directly reduce the temperature of flue gas with the moisture content on the surface of circulating ash, thereby the water capacity in the increase flue gas, reach an acid-base neutralization environment preferably, use the alkali components (Ca (OH) in a large amount of circulating ash again 2Deng) absorb the acid composition in the flue gas, reach the purpose of desulfurization, dust in flue gas after desulfurization is dense, after the cleaner (electric cleaner or sack cleaner) of dust in flue gas after by reactor (or reaction tower) removed, flue gas up to standard was sent into chimney by air-introduced machine and is effluxed behind the desulfurization and dedusting.
The cyclic semidry process desulfurization and dedusting technology is owing to be the alkaline circulating ash that need add a large amount of humidifications in reactor (or reaction tower), this following problem can occur: (1) makes the adding of circulating ash and the residing working condition of humidification system abominable, causes its wearing and tearing, bonding, obstruction and humidification non-uniform phenomenon easily; (2) join the significantly raising that a large amount of circulating ash in reactor (or reaction tower) must cause SR, increase operating cost; (3) humidification of circulating ash adds inlet and has only a place, gray surface moisture content can make the flue-gas temperature of adding place descend rapidly, temperature is fallen by about 140 ℃ that enter the mouth and is caused about 70 ℃, form bigger temperature difference herein, make in the equipment of cooling place and material, thermal stress to occur because of excessive temperature differentials; (4) a large amount of circulating ash in reactor will inevitably increase the load of back level cleaner, strengthen the model of deduster, increase cost of investment, more also can quicken the wearing and tearing to deduster.
[summary of the invention]
Purpose of the present invention is exactly in order to solve problems of the prior art, the semi-dry desulphurization dust collecting process that a kind of elder generation lowers the temperature in advance and recycles is proposed, can improve working condition, reduce system's running resistance, improve dust-collecting efficiency, reduce the operating load of back level cleaner, and prolong the service life of cleaner.
For achieving the above object, patent of the present invention has proposed the semi-dry desulphurization dust collecting process that a kind of elder generation lowers the temperature in advance and recycles, and in turn includes the following steps:
Pre-cooling: adopt cooling water to spray and make flue-gas temperature reduce to 100 ℃ by 140 ℃;
Sour gas absorbs: flue gas enters reactor, and the abundant hybrid reaction of circulation absorbent behind gas and the humidification, flue-gas temperature continue to drop to 70 ℃ by 100 ℃;
The dust dedusting: the flue gas that contains dust is removed dust through deduster; Flue gas up to standard is sent into chimney by air-introduced machine and is effluxed behind the desulfurization and dedusting;
The recirculation of absorbent humidification: the ash that gets off from deduster is collected in the circulating ash fluidisation storehouse, and the absorbent of circulating ash and fresh adding stirs humidification in the digestion hybrid humidifier, is entered in the reactor by the overflow of circulating ash recirculation inlet again.
As preferably, described pre-cooling is being carried out in pre-heat sink, in the pre-heat sink double flowing nozzle that water mixes with compressed air is housed, and the maximum particle diameter of the droplet that nozzle sprays is no more than 200 μ m, and droplet is not more than 3 seconds the drying time in heat sink in advance.
As preferably, after the described pre-cooling, sour gas also comprises drainage before absorbing: the flue gas after the pre-cooling is flowed through and is steadily entered reactor after 45 ° or 90 ° of drainage system drainages, and big particle is by discharging in the drainage system.
As preferably, SO during described sour gas absorbs 2Removal efficient is 80%-95%.
As preferably, dust is removed efficient and can be reached more than 99.9% in the described dust dedusting, and dust emission is less than 50mg/Nm 3
As preferably, stir humidification in the described absorbent humidification recirculation humidity is controlled at 4%.
The beneficial effect of patent of the present invention: the present invention is to the pre-earlier cooling recirculation of flue gas desulfurization and dedusting, can reduce the addition that the back level adds circulating ash, improve the adding of circulating ash and the working condition of humidification system, avoid the sticking wall fouling that the adding because of a large amount of humidification water produces and mix non-uniform phenomenon.The running resistance and the operating energy consumption of system have been reduced.Before desulphurization reaction, can reduce the ratio resistance of dust in the flue gas, improve dust-collecting efficiency the pre-humidification of flue gas.The dust that enters back level cleaner (deduster) significantly reduces, and has reduced the operating load of back level cleaner, has prolonged the service life of cleaner.
[description of drawings]
Fig. 1 is lower the temperature the in advance FB(flow block) of semi-dry desulphurization dust collecting process of recirculation of a kind of elder generation of the present invention;
Fig. 2 is lower the temperature the in advance schematic flow sheet of semi-dry desulphurization dust collecting process of recirculation of a kind of elder generation of the present invention.
[specific embodiment]
Consult Fig. 1,2, the deposit of the pre-heat sink 11 of flue gas, double flowing nozzle 12, flue gas drainage system 13, reactor 14, sack cleaner 15, circulating ash fluidisation storehouse 16, digestion hybrid humidifier 17, circulating ash recirculation inlet 18, absorbent and charging system 19, storehouse pump 20, air-introduced machine 21, chimney 22.
The semi-dry desulphurization dust collecting process that a kind of elder generation lowers the temperature in advance and recycles in turn includes the following steps:
Pre-cooling 1: adopt cooling water to spray and make flue-gas temperature reduce to 100 ℃ by 140 ℃.First from the flue gas that burning facility is discharged through the pre-heat sink 11 of a flue gas, earlier about 140 ℃ flue-gas temperature of air preheater outlet is reduced to about 100 ℃, at built-in one or more double flowing nozzle 12 of the pre-heat sink of flue gas, be used for spraying cooling water, airflow direction is identical with the cooling water direction, by regulating cooling water and compressed-air actuated jetting pressure and flow, make the maximum particle diameter of the cooling water droplet of double flowing nozzle ejection be not more than 200 μ m, the dry needed time of droplet in the pre-heat sink of flue gas is not more than 3 seconds, to guarantee the vaporization fully in the pre-heat sink of flue gas of cooling water droplet, make the deduster energy safe operation of back level, this moment, flue-gas temperature was reduced to about 100 ℃ by about 140 ℃ that enter the mouth.
Drainage 2: the flue gas after the pre-cooling is flowed through and is steadily entered reactor after flue gas drainage system 13 drainages of 45 ° or 90 °, and big particle is by discharging in the drainage system.
Sour gas absorbs 3: flue gas enters rectangular reactor 14, in reactor 14, fully mix with the circulating ash recirculation inlet 18 a small amount of alkaline circulating ash that overflow into, the cigarette temperature drop that makes about 100 ℃ of pre-heat sink 11 outlets of flue gas in the extremely short time is to about 70 ℃ of reactor 14 outlets, guarantee the flue gas dewfall not in follow-up pipeline and equipment, interior and the absorbent generation neutralization reaction of time that acidic gas in flue gas is extremely short, SO 2Removal efficient is 80%-95%.
Dust dedusting 4: the flue gas that contains dust is removed dust through sack cleaner 15; Flue gas up to standard is sent into chimney 22 by air-introduced machine 21 and is effluxed behind the desulfurization and dedusting.Dust is removed efficient and can be reached more than 99.9%, and dust emission is less than 50mg/Nm 3
Absorbent humidification recirculation 5: the ash that gets off from sack cleaner 15 is collected in the circulating ash fluidisation storehouse 16, and the absorbent of circulating ash and fresh adding stirs humidification in digestion hybrid humidifier 17, and humidity is controlled at 4%.Enter in the reactor 14 by 18 overflows of circulating ash recirculation inlet again.Collected in the circulating ash fluidisation storehouse 16 as circulating ash by sack cleaner 15 collected ashes, add digestion hybrid humidifier 17 by measuring the back, the alkaline absorbent of coming from the deposit and the charging system 19 of absorbent also constantly enters digestion hybrid humidifier 17, also adds a spot of humidification water in digestion hybrid humidifier 17 simultaneously.The absorbent of alkalescence is earlier through digestion in digestion hybrid humidifier 17, mix with the circulating ash fluidisation storehouse 16 interior abundant humidifications of circulating ash that add again, enter reactor 14 by the circulating ash that digests after hybrid humidifier 17 humidifications mix by 18 overflows of circulating ash recirculation inlet, thereby realize the recirculation of alkaline absorbent.Circulating ash unnecessary in circulating ash fluidisation storehouse 16 is then delivered to desulfurization ash storehouse by storehouse pump 20, sends into chimney 22 through desulfurization and dedusting clean flue gas up to standard by air-introduced machine 21 at last, enters atmosphere at last.
The foregoing description is to explanation of the present invention, is not limitation of the invention, any scheme after the simple transformation of the present invention is all belonged to protection scope of the present invention.

Claims (6)

1. the elder generation semi-dry desulphurization dust collecting process of recirculation of lowering the temperature in advance is characterized in that: in turn include the following steps:
Pre-cooling (1): adopt cooling water to spray and make flue-gas temperature reduce to 100 ℃ by 140 ℃;
Sour gas absorbs (3): flue gas enters reactor, and the abundant hybrid reaction of circulation absorbent behind gas and the humidification, flue-gas temperature continue to drop to 70 ℃ by 100 ℃;
Dust dedusting (4): the flue gas that contains dust is removed dust through deduster; Flue gas up to standard is sent into chimney by air-introduced machine and is effluxed behind the desulfurization and dedusting;
Absorbent humidification recirculation (5): the ash that gets off from deduster is collected in the circulating ash fluidisation storehouse, and the absorbent of circulating ash and fresh adding stirs humidification in the digestion hybrid humidifier, is entered in the reactor by the overflow of circulating ash recirculation inlet again.
2. the semi-dry desulphurization dust collecting process that a kind of elder generation as claimed in claim 1 lowers the temperature in advance and recycles, it is characterized in that: described pre-cooling (1) afterwards, sour gas absorbs (3) and also comprise drainage (2) before: the flue gas after the pre-cooling is flowed through and is steadily entered reactor after 45 ° or 90 ° of drainage system drainages, and big particle is by discharging in the drainage system.
3. the semi-dry desulphurization dust collecting process that a kind of elder generation as claimed in claim 1 lowers the temperature in advance and recycles, it is characterized in that: described pre-cooling (1) is carried out in pre-heat sink, in the pre-heat sink double flowing nozzle that water mixes with compressed air is housed, the maximum particle diameter of the droplet of nozzle ejection is no more than 200 μ m, and droplet is not more than 3 seconds the drying time in pre-heat sink.
4. the semi-dry desulphurization dust collecting process that a kind of elder generation as claimed in claim 1 lowers the temperature in advance and recycles is characterized in that: described sour gas absorbs SO in (3) 2Removal efficient is 80%-95%.
5. the semi-dry desulphurization dust collecting process that a kind of elder generation as claimed in claim 1 lowers the temperature in advance and recycles is characterized in that: dust removal efficient can reach more than 99.9% in the described dust dedusting (4), and dust emission is less than 50mg/Nm 3
6. the semi-dry desulphurization dust collecting process that a kind of elder generation as claimed in claim 1 lowers the temperature in advance and recycles is characterized in that: stir humidification in the described absorbent humidification recirculation (5) humidity is controlled at 4%.
CNA2008100602481A 2008-04-01 2008-04-01 Pre-cooling recycling semi-dry process desulfurization dust-removing technique Pending CN101264418A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101785965A (en) * 2010-03-02 2010-07-28 浙江菲达环保科技股份有限公司 Complex absorption cycle semi-dry desulfurization and denitrification integral process and device
CN101844021A (en) * 2010-01-15 2010-09-29 梁鑫 New process for closed absorbing, cooling, desulfurizing and purifying high-temperature waste gas
CN101920163A (en) * 2010-08-25 2010-12-22 河北钢铁股份有限公司唐山分公司 Desulfurization method for sintering flue gas by semi-dry process
CN101983755A (en) * 2010-11-05 2011-03-09 浙江菲达脱硫工程有限公司 Dry-type flue gas desulphurization, denitration and dedusting integrated device and method
CN102441321A (en) * 2010-10-05 2012-05-09 韩国energy技术研究院 Abdotbrnt internal and external circulating device and their methods for treatment of high temperature flue gases containing sulfur oxides and boron compounds

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101844021A (en) * 2010-01-15 2010-09-29 梁鑫 New process for closed absorbing, cooling, desulfurizing and purifying high-temperature waste gas
CN101785965A (en) * 2010-03-02 2010-07-28 浙江菲达环保科技股份有限公司 Complex absorption cycle semi-dry desulfurization and denitrification integral process and device
CN101785965B (en) * 2010-03-02 2013-06-12 浙江菲达环保科技股份有限公司 Complex absorption cycle semi-dry desulfurization and denitrification integral process and device
CN101920163A (en) * 2010-08-25 2010-12-22 河北钢铁股份有限公司唐山分公司 Desulfurization method for sintering flue gas by semi-dry process
CN102441321A (en) * 2010-10-05 2012-05-09 韩国energy技术研究院 Abdotbrnt internal and external circulating device and their methods for treatment of high temperature flue gases containing sulfur oxides and boron compounds
CN102441321B (en) * 2010-10-05 2014-11-05 韩国energy技术研究院 Device and methods for removing acid gases in flue gases
CN101983755A (en) * 2010-11-05 2011-03-09 浙江菲达脱硫工程有限公司 Dry-type flue gas desulphurization, denitration and dedusting integrated device and method

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Open date: 20080917