CN201105202Y - Device for synergetic removing fine grains in flue gas wet desulfurization - Google Patents

Device for synergetic removing fine grains in flue gas wet desulfurization Download PDF

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Publication number
CN201105202Y
CN201105202Y CNU2007200461465U CN200720046146U CN201105202Y CN 201105202 Y CN201105202 Y CN 201105202Y CN U2007200461465 U CNU2007200461465 U CN U2007200461465U CN 200720046146 U CN200720046146 U CN 200720046146U CN 201105202 Y CN201105202 Y CN 201105202Y
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smoke
flue gas
desulfurizing tower
phase transformation
chamber
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Expired - Fee Related
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CNU2007200461465U
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Chinese (zh)
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杨林军
颜金培
沈湘林
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Southeast University
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Southeast University
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Abstract

The utility model relates to a device to remove the fine grain cooperatively in a flue gas wet desulphurization, comprising a desulphurization tower, a dust collector, a flue gas reheater, an induced fan, a flue gas humidity regulation chamber, and a phase transition coagulation chamber. The utility model is characterized in that the flue gas humidity regulation chamber is positioned between the outlet of the dust collector and the inlet of the desulphurization tower, the phase transition coagulation chamber is positioned between the outlet of the desulphurization tower and the inlet of the flue gas reheater, the height of the desulphurization tower is increased properly, the top part space of the desulphurization tower is used as the phase transition coagulation chamber, and the induced fan is positioned at the outlet of the flue gas reheater. The device has the advantages of simple process, ability to boost the grain with granularity of PM2.5 to augment and remove the fine grains only by adding the flue gas humidity regulation chamber and the phase transition chamber based on the prior flue gas wet desulphurization device and filling up with the atomizing heating water or steam moderately, and high applicability to the flue gas wet desulphurization device in the prior electric power plant.

Description

The fine grain device of cooperation-removal in the smoke-gas wet desulfurization
One, technical field
The utility model belongs to PM in the flue gas 2.5Particulate removes technology, applying steam Transformation Principle cooperation-removal PM in particularly a kind of smoke-gas wet desulfurization 2.5Device.
Two, background technology
Pellet is the primary pollutant of present China city atmospheric environment, and especially wherein aerodynamic diameter is less than the PM of 2.5 μ m 2.5Pollution problem is very serious, and main cause is PM 2.5The particulate specific area is big, easily each heavy metal species of enrichment and chemical carcinogen, and conventional dedusting technology is difficult to effective capture to it, as wet desulfuration tower (comprising demister, scrubbing tower) to PM 2.5Arresting efficiency very low, but can reach more than 70~90% for the particulate removal efficiency more than 3~5 μ m; The wet desulfurization system WFGD of test 300MW coal-burning power plant such as the Wang Hui of Tsing-Hua University act on discovery to fine grain removing in the flue gas, and WFGD is to PM 1074.5% quality removal efficiency is arranged, but to PM 2.5Removal efficiency not high, and reduce removal efficiency significantly descend (" Proceedings of the CSEE " 2007 the 27th volume) with particle diameter.Fire coal is to cause PM in China's atmospheric environment 2.5The main cause that content increases.Therefore, control coal-fired PM 2.5Discharging is the key issue that presses for solution, and the main path of technical development is that the preliminary treatment measure is set before cleaner, is removed after making it grow up into larger particles by physics or chemical action; Wherein, the steam phase transforming preconditioning technique being combined with existing fire coal boiler fume wet desulphurization technology is most possibly to realize one of important channel that engineering is used.The mechanism that steam phase transforming impels particulate to increase is: in the supersaturated vapor environment, steam is with PM 2.5Particulate is that the nuclei of condensation undergo phase transition, and particle size increase, quality is increased, and produce the effect of diffusiophoresis and thermophoresis simultaneously, impels the particulate migration motion, and collision contacts mutually, further impels PM 2.5The particulate coalescence is grown up.At present, the smoke-gas wet desulfurization technology is more and more ripe and universal, high-temperature flue gas contacts with middle low-temp desulfurization liquid phase in desulfurizing tower, strong heat and mass transfer process takes place, high-temperature flue gas makes the vaporization of partial desulfurization absorption liquid, and flue gas relative humidity increases, and the cigarette temperature drop is low also can be near saturation state, but in existing smoke-gas wet desulfurization technology, do not reach and realize the required supersaturated vapor environment of steam phase transforming.Therefore, though existing smoke-gas wet desulfurization technology can effectively remove SO 2With meal dirt, but to PM 2.5Arresting efficiency very low, cause a large amount of PM 2.5Enter atmospheric environment.
Three, utility model content
The utility model provides a kind of higher characteristics of humidity of flue gas in the existing wet desulphurization technology that make full use of at above-mentioned technical problem, and the applying steam Transformation Principle realizes that WFGD effectively removes SO 2The time, impel PM 2.5The device that condenses and grow up and efficiently remove.
Technical solution of the present utility model is: cooperation-removal PM in a kind of realization smoke-gas wet desulfurization 2.5The device of method, comprise desulfurizing tower, deduster, smoke re-heater, air-introduced machine, also comprise smoke moisture conditioning chamber, phase transformation condensing chamber, the smoke moisture conditioning chamber is arranged between deduster outlet and the desulfurizing tower gas approach, the phase transformation condensing chamber is located at desulfurizing tower top exit place, also can suitably increase the desulfurizing tower height, makes the phase transformation condensing chamber with the desulfurizing tower headroom, the outlet of phase transformation condensing chamber links to each other with smoke re-heater, and air-introduced machine is located at the smoke re-heater exit; Be respectively equipped with desulfurizing tower demister and phase transformation condensing chamber demister in desulfurizing tower and the phase transformation condensing chamber.Phase transformation condensing chamber demister is mesh mist eliminator, baffle plate demister or eddy flow plate demister, preferred mesh mist eliminator.Desulfurizing tower is spray column, packed tower or plate column.
The technical solution of the utility model is by existing coal-fired flue-gas wet desulphurization device being improved, set up smoke moisture conditioning chamber and phase transformation condensing chamber, making it have the SO of removing simultaneously 2With promotion PM 2.5The effect of condensing and growing up and efficiently removing; It is characterized in that the smoke moisture conditioning chamber is arranged between deduster outlet and the desulfurizing tower gas approach, the phase transformation condensing chamber is located between desulfurizing tower exhanst gas outlet and smoke re-heater, also can suitably increase the desulfurizing tower height, makes the phase transformation condensing chamber with the desulfurizing tower headroom; At phase transformation condensing chamber smoke outlet efficient demister is set, phase transformation condensing chamber liner has the low-surface-energy material of promoting phase transformation effect and anticorrosion double effects.
According to the utility model, applying steam Transformation Principle cooperation-removal PM in the smoke-gas wet desulfurization 2.5Method be: the ash-laden gas from coal-burning boiler enters the smoke moisture conditioning chamber after deduster (as electrostatic precipitator) removes coarse granule, spraying into particle diameter is the fine hot water mists of 20~30 μ m, utilizing flue gas heat to make spray vaporization or directly injecting suitable quantity of water steam makes smoke moisture increase to 20~50% by 5~12%, enter desulfurizing tower from the desulfurizing tower bottom then, high temperature wet flue gas and middle low temperature absorption liquid counter current contacting in desulfurizing tower, flue gas is cooled off by humidification, reach hypersaturated state in the desulfurizing tower middle and upper part, supersaturated vapor is with PM 2.5Particulate is that the nuclei of condensation undergo phase transition, and makes PM 2.5Particle size increases, quality increases, and captures the dust-laden drop that condenses and grow up by doctor solution and desulfurizing tower demister then.Flue gas is through desulfurization and part PM 2.5After enter the phase transformation condensing chamber, in the phase transformation condensing chamber, inject suitable quantity of water steam or cooling device be set and regulate the flue gas degree of supersaturation, make the PM that does not remove 2.5Undergoing phase transition condenses grows up, and is removed the dust-laden drop that condenses and grow up by phase transformation condensing chamber demister; Purify flue gas through the smoke re-heater heat temperature raising to 70-80 ℃, by smoke stack emission.
The desulfurizing tower input gas temperature is 70~120 ℃, and desulfurizing tower import absorption liquid temperature is 20~50 ℃, than low 30~80 ℃ of input gas temperature.
Phase transformation condensing chamber demister can be mesh mist eliminator, deflection plate demister, eddy flow plate demister, preferred mesh mist eliminator; Desulfurizing tower is spray column, packed tower, plate column; The smoke-gas wet desulfurization technology can be limestone-gypsum method, two alkaline process, ammonia process etc.
In order to improve PM 2.5Removal effect, can in atomizing hot water, steam or desulfurization absorption liquid, add the surface tension that trace can significantly reduce the critical degree of supersaturation of steam coring and the aqueous solution, make particulate easily by the wetting agent of water-wet; Generally speaking wetting agent belongs to surfactant, as lauryl sodium sulfate, AEO, also can directly adopt commercially available wetting agent; Can contain multiple synergist or auxiliary agent in the wetting agent, as magnesium chloride, sodium sulphate etc., the wetting agent addition is generally 0.001~0.01% of solution or steam weight.
The beneficial effect that the utility model produces is: with steam phase transforming as removing PM 2.5Preconditioning technique, at first should set up the supersaturated vapor environment, but it is too high that simple dependence interpolation steam or cooling way make flue gas reach the supersaturation energy consumption, the utility model makes full use of that the higher characteristics of humidity of flue gas (can reach more than 90~95% as the desulfurizing and purifying gas phase to humidity in the existing smoke-gas wet desulfurization device, temperature is 40~60 ℃), the smoke moisture conditioning chamber is set before desulfurizing tower, by atomization hot water or directly inject an amount of steam and improve humidity of flue gas, impels part PM 2.5Undergoing phase transition in desulfurizing tower condenses grows up and is desulfurized liquid, desulfurizing tower demister and capture.Between desulfurizing tower outlet and smoke re-heater or the desulfurizing tower headroom phase transformation condensing chamber is set, inject small amount of steam or the flue gas cooling made the PM that does not remove for 5~10 ℃ 2.5Particulate condenses at the phase transformation condensing chamber and grows up, and removes the dust-laden drop that condenses and grow up by demister.Make phase transformation condensing chamber internal face or wall lining, coating with anti-corrosion low-surface-energy material, can promote steam at PM on the one hand 2.5Microparticle surfaces condenses and suppresses it and condense at phase transformation condensing chamber wall, and then promotes the phase transformation effect, also can solve the etching problem that causes because of the acid contaminant dewfall simultaneously.Add micro-wetting agent to reduce PM 2.5The steam degree of supersaturation of growing up required of condensing finally realizes PM 2.5efficiently remove.The utility model technology is simple, as long as set up smoke moisture conditioning chamber and phase transformation condensing chamber in existing smoke-gas wet desulfurization device, and is aided with interpolation an amount of atomizing hot water or steam, wet desulphurization device is had promote PM simultaneously 2.5The effect that granularity increases and removes can be widely used in existing power-plant flue gas wet desulphurization device.
Four, description of drawings
Fig. 1 is the apparatus structure schematic diagram of the utility model embodiment 1;
Fig. 2 is the apparatus structure schematic diagram of the utility model embodiment 2.
Among the figure: the 1-deduster; 2-smoke moisture conditioning chamber; 3-atomized water nozzle; The 4-smoke re-heater; The 5-desulfurizing tower; 6-doctor solution nozzle; 7-desulfurizing tower demister; 8-doctor solution circulating pump; 9-phase transformation condensing chamber; The 10-steam jet; 11-phase transformation condensing chamber demister; The 12-air-introduced machine.
Five, the specific embodiment
Embodiment 1:
Cooperation-removal PM in the smoke-gas wet desulfurization of the present utility model 2.5Method as shown in Figure 1: after the ash-laden gas that coal-burning boiler produces removes the coarse granule of particle diameter 〉=2.5 μ m through deduster (as electrostatic precipitator) 1, enter smoke moisture conditioning chamber 2, spray into the water droplets that particle diameter is 20~30 μ m through atomized water nozzle 3, utilize flue gas heat to make water droplets evaporation fully in humidity regulation chamber 2, the atomized water addition increases to 20~50% with flue gas relative humidity after regulating by 5~12% and determines.Flue gas through humidity regulation enters desulfurizing tower 5 from the desulfurizing tower bottom, high temperature wet flue gas in desulfurizing tower 5 (temperature: 70~120 ℃) and middle low-temp desulfurization absorption liquid (temperature: 20~50 ℃) counter current contacting, high-temperature flue gas makes and partially absorbs the liquid vaporization, flue gas relative humidity increases, the cigarette temperature drop is low, and reach hypersaturated state in desulfurizing tower 5 middle and upper parts, when finishing desulfurization, supersaturated vapor is with PM 2.5Particulate is that the nuclei of condensation undergo phase transition, and makes PM 2.5Particle size increases, quality increases, and captures the dust-laden drop that condenses and grow up by doctor solution, desulfurizing tower demister 7, removes about 40~60% PM 2.5Particulate; The characteristics of this process are desulfurization and PM 2.5Condense to grow up and remove simultaneously and carry out, but steam is at PM 2.5When microparticle surfaces condenses, also can be condensed in desulfurization drop surface and loss.Flue gas is through desulfurization and part PM 2.5After, enter phase transformation condensing chamber 9 by desulfurizing tower 5, inject an amount of steam through steam jet 10 and impel the PM that does not remove 2.5Particulate undergoes phase transition to condense grows up, and removes the dust-laden drop that condenses and grow up by demister 11, removes about 40~60% PM 2.5In atomizing hot water and steam, add 0.001~0.01% wetting agent,, reduce the critical degree of supersaturation of steam that undergoes phase transition to promote that steam condenses at microparticle surfaces.Purify flue gas through smoke re-heater 4 heat temperature raisings to 70~80 ℃, introduce smoke stack emissions in atmosphere by air-introduced machine 12 then.
As shown in Figure 1, cooperation-removal PM in the smoke-gas wet desulfurization of the present utility model 2.5The device of method mainly is made up of smoke moisture conditioning chamber 2, desulfurizing tower 5, phase transformation condensing chamber 9; Smoke moisture conditioning chamber 2 is arranged between deduster 1 outlet and the smoke re-heater 4, in establish atomized water nozzle 3, it is definite that smoke moisture conditioning chamber 2 sizes are evaporated required time with the time of staying of flue gas in conditioning chamber fully greater than water droplets; Phase transformation condensing chamber 9 places between desulfurizing tower 5 outlets and the smoke re-heater 4, in establish steam jet 10, phase transformation condensing chamber 9 outlet is provided with efficient demister 11, and internal layer serves as a contrast with anti-corrosion low-surface-energy material, phase transformation condensing chamber 9 sizes with the time of staying of flue gas in condensing chamber greater than steam at PM 2.5The microparticle surfaces coring is condensed and is grown up that (about 50~200ms) determine required time.
Embodiment 2:
As shown in Figure 2, as different from Example 1, the phase transformation condensing chamber is not set specially, but suitably increase the desulfurizing tower height, make phase transformation condensing chamber 9 with desulfurizing tower 5 headrooms (being that desulfurizing tower demister 7 is with the upper part), and inject an amount of steam, top of tower is provided with efficient demister 11, tower outlet purify flue gas behind smoke re-heater 4 heat temperature raisings by smoke stack emission.
Embodiment 3:
In the smoke moisture conditioning chamber 2 steam jet is set, directly injects an amount of steam and regulate humidity of flue gas, all the other are with embodiment 1 or 2.
Embodiment 4:
Smoke moisture conditioning chamber 2 places after the smoke re-heater 4, i.e. between smoke re-heater 4 outlets and desulfurizing tower 5 gas approach, all the other are with embodiment 3.
Embodiment 5:
In the phase transformation condensing chamber 9 flue gas cooling device is set, with 5~10 ℃ of desulfurizing and purifying flue gas coolings, makes it reach hypersaturated state, all the other are with embodiment 1.
Embodiment 6:
Flue gas is produced by fully-automatic coal-fired boiler, and exhaust gas volumn is 100Nm 3/ h, desulfurizing tower adopts the spray column of diameter 150mm, high 1500mm, and the wet desulphurization technology is a limestone-gypsum method, and the phase transformation condensing chamber places the desulfurizing tower outlet, and eddy flow plate demister, mesh mist eliminator are installed respectively in desulfurizing tower, the phase transformation condensing chamber.The ash-laden gas that coal-burning boiler produces enters the humidity regulation chamber after cyclone dust collectors remove coarse granule, spray into the fine water-spray that 70 ℃ of temperature, particle diameter are about 20~30 μ m by atomizer, and straying quatity is 0.025kg/Nm 3Flue gas, after regulating, the desulfurizing tower input gas temperature is 80 ℃, relative humidity is 35%; The limestone desulfurization suspension temperature is 20 ℃, liquid-gas ratio 2.5L/Nm 3, flue gas and lime stone suspension counter current contacting in the desulfurizing tower; Claim low pressure impactor ELPI on-line testing through electricity, a PM 2.5The quality removal efficiency is 42%; Flue gas is through desulfurization and part PM 2.5After enter the phase transformation condensing chamber, every Nm 3Flue gas injects 0.015kg steam, and secondary removes PM 2.5, PM 2.5The gross mass removal efficiency reaches 86%.
Embodiment 7:
Desulfurizing tower is diameter 150mm, the rotating stream tray scrubber of high 2000mm, and the phase transformation condensing chamber places the desulfurizing tower headroom, and the smoke-gas wet desulfurization technology is two alkaline process, and all the other are with embodiment 6; Claim low pressure impactor ELPI on-line testing through electricity, PM 2.5The gross mass removal efficiency reaches 82%.
Comparative Examples 1:
Adopt embodiment 6 pilot systems and desulfurization method of limestone-gypsum technology, but do not add steam and atomized water in the smoke moisture conditioning chamber, the phase transformation condensing chamber does not inject steam, claims low pressure impactor ELPI on-line testing to PM through electricity 2.5The quality removal efficiency be 12%.
Comparative Examples 2:
Adopt embodiment 7 pilot systems and double alkali method desulfurizing technology, but do not add steam and atomized water in the smoke moisture conditioning chamber, the phase transformation condensing chamber does not inject steam, claims low pressure impactor ELPI on-line testing to PM through electricity 2.5The quality removal efficiency be 17%.

Claims (5)

1. the fine grain device of cooperation-removal in the smoke-gas wet desulfurization, comprise desulfurizing tower (5), deduster (1), smoke re-heater (4), air-introduced machine (12), it is characterized in that also comprising smoke moisture conditioning chamber (2), phase transformation condensing chamber (9), the smoke moisture conditioning chamber is arranged between deduster (1) outlet and desulfurizing tower (5) gas approach, phase transformation condensing chamber (9) is located between desulfurizing tower (5) exhanst gas outlet and smoke re-heater (4) import, also can suitably increase the desulfurizing tower height, make the phase transformation condensing chamber with the desulfurizing tower headroom, air-introduced machine (12) is located at smoke re-heater (4) exit.
2. the fine grain device of cooperation-removal in the smoke-gas wet desulfurization according to claim 1 is characterized in that described phase transformation condensing chamber liner has the low-surface-energy material of promoting phase transformation effect and anticorrosion double effects, as polytetrafluoroethylene (PTFE).
3. the fine grain device of cooperation-removal in the smoke-gas wet desulfurization according to claim 1 is characterized in that being respectively equipped with in described desulfurizing tower and the phase transformation condensing chamber desulfurizing tower demister (7) and phase transformation condensing chamber demister (11).
4. the fine grain device of cooperation-removal in the flue gas warm therapy according to claim 3 desulfurization is characterized in that described demister is mesh mist eliminator, baffle plate demister or eddy flow plate demister.
5. the fine grain device of cooperation-removal in the smoke-gas wet desulfurization according to claim 3 is characterized in that described demister is a mesh mist eliminator.
CNU2007200461465U 2007-09-14 2007-09-14 Device for synergetic removing fine grains in flue gas wet desulfurization Expired - Fee Related CN201105202Y (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102059029A (en) * 2010-11-25 2011-05-18 东南大学 Method and device for removing fine particles in high-humidity gas fume
CN103697488A (en) * 2013-12-27 2014-04-02 四川川润动力设备有限公司 System for removing PM2.5 (particulate matter 2.5) and sulfur together, and CFB system and method
CN103697487A (en) * 2013-12-30 2014-04-02 上海克莱德贝尔格曼机械有限公司 Flue gas treatment device
CN103721554A (en) * 2013-12-10 2014-04-16 中国华电工程(集团)有限公司 Electric demisting method and device for capturing and collecting fine particulate matters in flue gas generated after wet desulphurization
CN104906913A (en) * 2015-04-17 2015-09-16 东南大学 Method for reducing suspension particles in air by using humidification water condensation, and apparatus thereof
CN106268178A (en) * 2016-08-16 2017-01-04 辽宁工程技术大学 A kind of dust removal mist integrated apparatus for wet desulfurization system and method
CN108686478A (en) * 2017-04-06 2018-10-23 中国石油化工股份有限公司 The processing method and device of a kind of flue gas desulfurization and desulfurization wastewater
CN109990611A (en) * 2019-04-09 2019-07-09 安徽工业大学 A kind of electric furnace flue gas high-effective dust-removing and residual neat recovering system and method

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102059029B (en) * 2010-11-25 2013-12-25 东南大学 Method and device for removing fine particles in high-humidity gas fume
CN102059029A (en) * 2010-11-25 2011-05-18 东南大学 Method and device for removing fine particles in high-humidity gas fume
CN103721554B (en) * 2013-12-10 2016-01-06 中国华电工程(集团)有限公司 The electric defogging method of the fine particle in trapping wet-method desulfurized fume and device
CN103721554A (en) * 2013-12-10 2014-04-16 中国华电工程(集团)有限公司 Electric demisting method and device for capturing and collecting fine particulate matters in flue gas generated after wet desulphurization
CN103697488A (en) * 2013-12-27 2014-04-02 四川川润动力设备有限公司 System for removing PM2.5 (particulate matter 2.5) and sulfur together, and CFB system and method
CN103697488B (en) * 2013-12-27 2016-03-16 四川川润动力设备有限公司 Cooperation-removal PM 2.5and the system of desulfurization and CFB system and method
CN103697487A (en) * 2013-12-30 2014-04-02 上海克莱德贝尔格曼机械有限公司 Flue gas treatment device
CN103697487B (en) * 2013-12-30 2016-05-11 上海克莱德贝尔格曼机械有限公司 A kind of flue gas processing device
US9782782B2 (en) 2013-12-30 2017-10-10 Shanghai Clyde Bergemann Machinery Co., Ltd. Flue gas treatment device
CN104906913A (en) * 2015-04-17 2015-09-16 东南大学 Method for reducing suspension particles in air by using humidification water condensation, and apparatus thereof
CN106268178A (en) * 2016-08-16 2017-01-04 辽宁工程技术大学 A kind of dust removal mist integrated apparatus for wet desulfurization system and method
CN106268178B (en) * 2016-08-16 2018-12-07 辽宁工程技术大学 A kind of dedusting for wet desulfurization system-mist integrated apparatus and method
CN108686478A (en) * 2017-04-06 2018-10-23 中国石油化工股份有限公司 The processing method and device of a kind of flue gas desulfurization and desulfurization wastewater
CN109990611A (en) * 2019-04-09 2019-07-09 安徽工业大学 A kind of electric furnace flue gas high-effective dust-removing and residual neat recovering system and method

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