CN103721548B - PM in a kind of promotion wet desulphurization neat stress 2.5the desulfurizer removed and method thereof - Google Patents

PM in a kind of promotion wet desulphurization neat stress 2.5the desulfurizer removed and method thereof Download PDF

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CN103721548B
CN103721548B CN201410022770.6A CN201410022770A CN103721548B CN 103721548 B CN103721548 B CN 103721548B CN 201410022770 A CN201410022770 A CN 201410022770A CN 103721548 B CN103721548 B CN 103721548B
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desulfurization
humid air
neat stress
flue gas
cleaning solution
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CN201410022770.6A
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CN103721548A (en
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杨林军
潘丹萍
吴昊
姜业正
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东南大学
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Abstract

The invention discloses PM in a kind of promotion wet desulphurization neat stress 2.5the desulfurizer removed and method thereof, be that a flue gas desulfurization wash mill and a fog drip gathering device are composed in series, flue gas desulfurization wash mill is followed successively by doctor solution zoneofoxidation, desulfurization scrubbing section, steam phase change zone from bottom to top; Fog drip gathering device and flue gas desulfurization wash mill are integral type or split-type structural, are arranged on flue gas desulfurization wash mill or outlet.Its method is that flue gas removes SO through desulfurization scrubbing section 2after enter steam phase change zone, through humid air distributor inject humid air, make desulfurization neat stress reach hypersaturated state, supersaturated vapor is at PM 2.5there is coring condensation in surface, makes PM 2.5become the dust-laden droplet of surface coverage one deck liquid film, particle diameter increases, and the dust-laden droplet of condensation growth enters fog drip gathering device, is trapped by droplet cleaning solution and fog drip gathering device demister.The present invention effectively can reduce the energy consumption set up supersaturated vapor environment and need, and solves wet method fume desulfurizing system PM 2.5emission problem.

Description

PM in a kind of promotion wet desulphurization neat stress 2.5the desulfurizer removed and method thereof

Technical field

The invention belongs to PM in a kind of flue gas 2.5the technical field of emission control, particularly one application steam Transformation Principle promotes PM in wet desulphurization neat stress 2.5the desulfurizer removed and method thereof.

Background technology

Wet process of FGD (WFGD) has become China and has removed SO 2mainstream technology, the big-and-middle-sized coal fired power plant of more than 80% adopts wet fuel gas desulfurizing technology, and this technique also increases increasingly in the application in the field such as coal-burned industrial boiler, sinter fume.In WFGD process, due to the cleaning function of desulfurization slurry, though can remove the meal dirt in flue gas, owing to existing, desulfurization slurry atomization is carried secretly, desulfurization product crystallization, and the materializing procedure such as various solution-air, gas-liquid-solid desulphurization reaction, itself may form PM again 2.5, make flue gas PM after wet desulphurization 2.5concentration of emission increases on the contrary.As installed the coal-burning power plant of WFGD system, entering the fine particle of atmospheric environment except burned-coal fly ash, also comprising the inorganic salts particulate of sulfuric acid mist, desulfurization formation; Holland Meij analyzes and finds, limestone/gypsum method desulphurization system outlet fine particle belongs to PM substantially 2.5, except burned-coal fly ash, also containing the component such as gypsum and unreacted lime stone (Fuel Processing Technology, 2004,85 (6-7): 641-656).

Adopt the dust removal installation such as electric bag, cloth bag, Novel electric dedusting can only reduce the PM entering wet desulfuration tower 2.5concentration, for the PM formed in WFGD process 2.5helpless; Though effectively can remove the PM in desulfurization neat stress at WFGD system downstream installation wet-esp 2.5, but higher owing to investing operating cost, be also difficult to enter the comprehensive practical stage.In addition, being in saturation state in view of after smoke-gas wet desulfurization, is promote PM in wet desulphurization neat stress based on supersaturated vapor at the steam phase change technique of microparticle surfaces congealing property 2.5the important measures removed, adopt this technology that wet desulphurization neat stress first will be made to reach supersaturation, and the most simple measure adds steam or arrange heat exchanger flue gas is cooled, but the latter can cause supersaturated vapor to be mainly condensed in heat exchanger wall, weakens PM 2.5condensation growth effect, and energy consumption is higher.Adopt the degree of supersaturation of adding stream mode foundation can raise with desulfurization neat stress temperature sharply reduce, when making the occasion being applied to desulfurization neat stress temperature higher (>=55 ~ 70 DEG C), steam consumption quantity is too high.Application number be 200710132250.0 patent of invention disclose a kind of employing and in desulfurization neat stress, add steam set up PM 2.5supersaturated vapor environment needed for condensation growth, is then removed the method for the dust-laden droplet of condensation growth by mesh mist eliminator; But depend merely on interpolation stream mode and realize supersaturation, energy consumption is too high, particularly when desulfurization neat stress temperature is higher.Meanwhile, in view of PM 2.5the dust-laden droplet that outer surface covers one deck liquid film is become after condensation growth, need be supporting with the cleaner that can remove droplet, as wet scrubber, demister etc., though wherein mesh mist eliminator has preferably removal effect for the dust-laden droplet after condensation growth, but when being applied to desulfurization method of limestone-gypsum technique, easily stifled, and resistance is larger; Though deflection plate demister is wet desulfurization demister the most conventional at present, it just has better removal effect to the droplet of some tens of pm, and PM 2.5be difficult to condensation growth to this particle size range.

Summary of the invention

Goal of the invention: the present invention is directed to the feature that flue gas moisture content after wet desulphurization is in saturation state, provides a kind of application steam Transformation Principle to promote PM in wet desulphurization neat stress 2.5the desulfurizer removed and method thereof.

Technical scheme: PM in a kind of promotion wet desulphurization neat stress 2.5the desulfurizer removed, described desulfurizer is that a flue gas desulfurization wash mill and a fog drip gathering device are composed in series, and described flue gas desulfurization wash mill is followed successively by doctor solution zoneofoxidation, desulfurization scrubbing section, steam phase change zone from bottom to top; Be provided with oxidation air import in doctor solution zoneofoxidation, supplement desulfurizing agent import and the outlet of desulfurization cleaning solution; Smoke inlet, the import of desulfurization cleaning solution, mist separator of desulfurization and mist separator of desulfurization rinse water arrangement is disposed with from lower to upper at desulfurization scrubbing section; Humid air distributor is provided with in the middle part of steam phase change zone; Described fog drip gathering device and flue gas desulfurization wash mill are integral type structure, be arranged on flue gas desulfurization wash mill, described fog drip gathering device is provided with cleaning solution collector, cleaning solution overfall, the import of droplet cleaning solution, fog drip gathering device demister and droplet mist eliminator flushing water device and exhanst gas outlet from bottom to top successively, and cleaning solution overfall is connected with doctor solution zoneofoxidation with mist separator of desulfurization rinse water arrangement by overflow pipe.

Described steam phase change zone size need meet the flue gas time of staying wherein and be more than or equal to steam at PM 2.5surface coring condensation growth required time.

Described fog drip gathering device and flue gas desulfurization wash mill replace with split-type structural, described fog drip gathering device is provided with gas approach from lower to upper successively, the outlet of droplet cleaning solution, the import of droplet cleaning solution, fog drip gathering device demister and droplet mist eliminator flushing water device and exhanst gas outlet.

Described fog drip gathering device also installs 1 ~ 2 laminate ripple or ripple silk net structured packing additional, and packing specific area is 125 ~ 375m 2/ m 3, every layer of filler loading height is 500 ~ 1000mm.

Described humid air distributor is made up of humid air supervisor, arm and bracing frame, in the sector region of same supervisor or tube section 90 ~ 120 °, evenly at least 3 qi-emitting holes are set, qi-emitting hole is 200 ~ 500mm along the pitch of holes of humid air supervisor or arm axis, and the aperture of qi-emitting hole is 3 ~ 10mm.

A kind of application promotes PM in wet desulphurization neat stress 2.5the sulfur method of the desulfurizer removed, is characterized in that, removes step to be: flue gas enters rear and desulfurization cleaning solution counter current contacting by desulfurization scrubbing section bottom, by water-vapo(u)r saturation or close to saturated after desulfurization scrubbing section, and cigarette temperature drop to 55 ~ 70 DEG C; Then enter steam phase change zone after removing desulfurization slurry droplet by mist separator of desulfurization, inject humid air through humid air distributor, caloic occurs between humid air and desulfurization neat stress and exchanges, make desulfurization neat stress reach hypersaturated state, supersaturated vapor is at PM 2.5there is coring condensation in surface, makes PM 2.5become the dust-laden droplet of surface coverage one deck liquid film, particle diameter increases, the dust-laden droplet of condensation growth enters fog drip gathering device, removed the dust-laden droplet of condensation growth by the droplet cleaning solution sprayed into, then discharged by exhanst gas outlet by the flue gas after fog drip gathering device demister trapping cleaning solution droplet.

Described humid air addition is 10 ~ 25% of desulfurization neat stress volume, humid air temperature is lower than desulfurization neat stress more than 20 DEG C, humid air relative humidity RH >=60%, after mixing with humid air to make desulfurization neat stress, flue gas degree of supersaturation S increases to S=1.05 ~ 1.20 by S ≈ 1.00.

Described humid air take from coal fired power plant cooling tower through and T≤40 that exchange of recirculated cooling water generation caloic DEG C, RH >=85% humid air, or T≤35 after work of water sprinkling for better material moisture DEG C, RH >=80% humid air, or directly take from T≤25 in atmospheric environment DEG C, RH >=60% Low Temperature Wet air.

Liquid-gas ratio in fog drip gathering device controls at 1 ~ 5L/Nm 3; Cleaning solution after trapping dust-laden droplet and mist eliminator flushing water come together in doctor solution zoneofoxidation through overflow pipe part after being collected by cleaning solution collector, and part is as the flushing water of mist separator of desulfurization.

Beneficial effect:

1. utilize supersaturated vapor to be impel PM at the coring congealing property of microparticle surfaces 2.5the important measures that granularity increases, are particularly suitable for the process that moisture content in flue gas is higher; Flue gas after wet desulphurization, flue gas relative humidity increase and can close to or the state that reaches capacity, more easily set up PM 2.5supersaturated vapor environment needed for condensation growth.

2. based on the non-linear relation between humid gas saturated vapor pressure and temperature, the gas of mixing two bursts of different humitures can set up supersaturated vapor environment, produces warm moist air and cold air in white mist and atmospheric environment and cross that to form precipitation similar after its principle and wet desulphurization neat stress enter atmospheric environment.The present invention utilizes above-mentioned know-why, sets up PM by the humid air introducing lower than desulfurization neat stress more than 20 DEG C of temperature in desulfurization neat stress 2.5supersaturated condition needed for condensation growth, and the degree of supersaturation of mist raises with desulfurization neat stress temperature and increases, and is particularly suitable for the occasion of desulfurization neat stress temperature higher (>=55 ~ 70 DEG C); With interpolation steam or arrange heat exchanger and make compared with flue gas cooling provision, significantly to reduce and set up PM 2.5the energy consumption of supersaturated vapor environment needed for condensation growth.

3. the present invention is by arranging fog drip gathering device at flue gas desulfurization wash mill top or outlet, the dust-laden droplet after condensation growth is trapped by droplet cleaning solution and fog drip gathering device demister, and by installing 1 ~ 2 laminate ripple or ripple silk net structured packing enhancement washing trapping effect additional.On the one hand, arresting efficiency significantly improves; Meanwhile, because the dust-laden droplet of condensation growth to enter before fog drip gathering device demister substantially by washing trapping, effectively can solve and depend merely on demister trapping, the susceptible to plugging defect of demister in running.

4. present invention process is simple, as long as simply transform desulfurizer, arrange steam phase change zone in flue gas desulfurization wash mill, top or outlet arrange fog drip gathering device, installs humid air distributor, introduce appropriate humid air in steam phase change zone; Under the prerequisite ensureing desulfuration efficiency, can effectively remove the PM formed in based Wet Process Flue Gas 2.5(as gypsum, SO 3acid mist etc.), coal fired power plant, coal-burned industrial boiler, sintering plant etc. that WFGD system is installed can be widely used in.With install compared with wet electrical dust precipitator in WFGD system downstream, investment operating cost is low.

Accompanying drawing explanation

Fig. 1 is the apparatus structure schematic diagram of the embodiment of the present invention 1;

Fig. 2 is the apparatus structure schematic diagram of the embodiment of the present invention 2;

Fig. 3 is humid air structure of distributor schematic diagram of the present invention.

In figure: 1-desulfurizing tower; 2-doctor solution nozzle; 3-mist separator of desulfurization; 4-humid air distributor; 4-1-humid air supervisor, 4-2-arm; 4-3-bracing frame; 5-cleaning solution feeder; 6-fog drip gathering device filler; 7-fog drip gathering device demister; 8-overflow pipe; 9-doctor solution circulating pump; 10-droplet detergent circulator; A-doctor solution zoneofoxidation; B-desulfurization scrubbing section; C-steam phase change zone; D-fog drip gathering device.

Detailed description of the invention

Below in conjunction with Fig. 1 ~ 3, the present invention is elaborated:

PM in a kind of promotion wet desulphurization neat stress 2.5the desulfurizer removed is that a flue gas desulfurization wash mill and a fog drip gathering device are composed in series, and described flue gas desulfurization wash mill and fog drip gathering device can be integral type also can be split type setting.When for integral type, then entirety is desulfurizing tower form, and described flue gas desulfurization wash mill is followed successively by doctor solution zoneofoxidation, desulfurization scrubbing section, steam phase change zone from bottom to top; Be provided with oxidation air import in doctor solution zoneofoxidation, supplement desulfurizing agent import and the outlet of desulfurization cleaning solution; Smoke inlet, the import of desulfurization cleaning solution, mist separator of desulfurization and mist separator of desulfurization rinse water arrangement is disposed with from lower to upper at desulfurization scrubbing section; Humid air distributor is provided with in the middle part of steam phase change zone; Described fog drip gathering device and flue gas desulfurization wash mill are integral type structure, be arranged on flue gas desulfurization wash mill, described fog drip gathering device is provided with cleaning solution collector, cleaning solution overfall, the import of droplet cleaning solution, fog drip gathering device demister and droplet mist eliminator flushing water device and exhanst gas outlet from bottom to top successively, and cleaning solution overfall is connected with doctor solution zoneofoxidation with mist separator of desulfurization rinse water arrangement by overflow pipe.

PM in a kind of promotion wet desulphurization neat stress 2.5the desulfurizer removed, the size of the steam phase change zone in described desulfurizer is no less than steam at PM with the flue gas time of staying wherein 2.5surface coring condensation growth required time is determined, about 50 ~ 200ms.Described fog drip gathering device can install 1 ~ 2 laminate ripple or ripple silk net structured packing additional, and packing specific area is 125 ~ 375m 2/ m 3, every layer of filler loading height is 500 ~ 1000mm.PM in a kind of promotion wet desulphurization neat stress 2.5the desulfurizer removed, described fog drip gathering device and the split type layout of flue gas desulfurization wash mill.

Described fog drip gathering device can be spray scrubber, stuffing washing tower; When for split-type structural, except first two can also select Venturi scrubber structure.

Described droplet cleaning solution outlet is connected with the import of droplet cleaning solution by droplet detergent circulator.

PM in a kind of promotion wet desulphurization neat stress 2.5the desulfurizer removed, described humid air distributor is made up of humid air supervisor and arm, in same supervisor or tube section 90 ~ 120 ° of sector regions, evenly arrange 3 qi-emitting holes, axial hole spacing is 200 ~ 500mm, and the aperture of qi-emitting hole is 3 ~ 10mm.

The desulfurization cleaning solution outlet of doctor solution zoneofoxidation is connected with the desulfurization cleaning solution import of doctor solution scrubbing section by doctor solution circulating pump.

PM in a kind of promotion wet desulphurization neat stress 2.5the method removed, it removes step and is: flue gas after the desulfurization scrubbing section of desulfurizing tower by water-vapo(u)r saturation or close to saturated, cigarette temperature drop to 55 ~ 70 DEG C; Then enter steam phase change zone after removing water smoke by mist separator of desulfurization, inject appropriate humid air through humid air distributor, caloic occurs between humid air and desulfurization neat stress and exchanges, make desulfurization neat stress reach hypersaturated state, supersaturated vapor is at PM 2.5there is coring condensation in surface, makes PM 2.5become the dust-laden droplet of surface coverage one deck liquid film, particle diameter increases, and the dust-laden droplet of condensation growth enters fog drip gathering device, by cleaning solution and the demister trapping being located at fog drip gathering device top.

PM in a kind of promotion wet desulphurization neat stress 2.5the method removed, described humid air addition is 10 ~ 25% of desulfurization neat stress volume, humid air temperature is lower than desulfurization neat stress more than 20 DEG C, humid air relative humidity RH>=60%, and after mixing with humid air to make desulfurization neat stress, flue gas degree of supersaturation S increases to S=1.05 ~ 1.20 by S ≈ 1.00.

PM in a kind of promotion wet desulphurization neat stress 2.5the method removed, humid air (T≤40 DEG C that in the desirable spontaneous combustion coal Cooling Tower of Power Station of described humid air, warp and recirculated cooling water generation caloic exchange; RH>=85%), or humid air (T≤35 DEG C after work of water sprinkling for better material moisture; RH>=80%), also directly can take from Low Temperature Wet air (T≤25 DEG C in atmospheric environment; RH>=60%).

PM in a kind of promotion wet desulphurization neat stress 2.5the method removed, described fog drip gathering device liquid-gas ratio 1 ~ 5L/Nm 3; Cleaning solution after trapping dust-laden droplet and mist eliminator flushing water come together in doctor solution zoneofoxidation through overflow pipe part after being collected by cleaning solution collector, and part is as the flushing water of mist separator of desulfurization.

Embodiment 1:

A kind of desulfurizer, is applied to PM in described promotion wet desulphurization neat stress 2.5in the method removed, the desulfurizing tower 1 of described desulfurizer is an absorption tower with multistage functional section, and tower bottom is doctor solution zoneofoxidation A, and middle part is desulfurization scrubbing section B, and top is PM 2.5there is the fog drip gathering device D of dust-laden droplet after the steam phase change zone C of condensation growth and trapping condensation growth.Be provided with oxidation air import at doctor solution zoneofoxidation A, supplement desulfurizing agent import and the outlet of desulfurization cleaning solution.Be provided with gas approach in the bottom of desulfurization scrubbing section B, top is provided with the import of desulfurization cleaning solution, can adopt hollow-spraying-tower, column plate or filling-material structure.Humid air distributor 4 is provided with in the middle part of steam phase change zone C, humid air distributor 4 is responsible for 4-1, arm 4-2 and bracing frame 4-3 by humid air to form, in same supervisor or tube section 90 ~ 120 ° of sector regions, 3 qi-emitting holes are evenly set, axial hole spacing is 200 ~ 500mm, and the aperture of qi-emitting hole is 3 ~ 10mm; The size of steam phase change zone C is no less than steam at PM with the flue gas time of staying wherein 2.5surface coring condensation growth required time is determined, about 50 ~ 200ms.Fog drip gathering device D can install 1 ~ 2 laminate ripple additional or ripple silk net structured packing forms droplet trapping district filler 6, and the specific area of droplet trapping district filler 6 is 125 ~ 375m 2/ m 3, every layer of filler loading height is 500 ~ 1000mm.Mist separator of desulfurization 3 and mist eliminator flushing water system is provided with between desulfurization scrubbing section B and steam phase change zone C; Cleaning solution collector 5 is provided with between steam phase change zone C and fog drip gathering device D; Cleaning solution collector 5 is communicated with mist separator of desulfurization rinse water arrangement and doctor solution zoneofoxidation A by overflow pipe 8; Fog drip gathering device D top is provided with fog drip gathering device demister 7 and mist eliminator flushing water device.Mist separator of desulfurization 3 selects lower resistance demister, and as deflection plate demister, rotational flow plate defroster, high efficiency demister selected by fog drip gathering device demister 7, as Lamb wave line demister, mesh mist eliminator.

According to the present invention, PM in a kind of promotion wet desulphurization neat stress 2.5the method removed is as shown in Figure 1: flue gas enters in tower by desulfurizing tower 1 bottom smoke inlet, with the desulfurization cleaning solution counter current contacting sprayed through circulating pump 9, doctor solution nozzle 2, flue gas with doctor solution counter current contacting process in be humidified cooling, by water-vapo(u)r saturation or close to saturated after desulfurization scrubbing section B, cigarette temperature drop to 55 ~ 70 DEG C.Then enter steam phase change zone C after removing desulfurization slurry droplet by mist separator of desulfurization 3, inject appropriate humid air through humid air distributor 4, caloic occurs between humid air and desulfurization neat stress and exchanges, make desulfurization neat stress reach hypersaturated state, supersaturated vapor is at PM 2.5there is coring condensation in surface, makes PM 2.5become the dust-laden droplet of surface coverage one deck liquid film, particle diameter increases, and quality increases; Humid air addition is 10 ~ 25% of desulfurization neat stress volume, humid air temperature is lower than desulfurization neat stress more than 20 DEG C, humid air relative humidity RH>=60%, after mixing with humid air to make desulfurization neat stress, flue gas degree of supersaturation S increases to S=1.05 ~ 1.20 by S ≈ 1.00; Humid air (T≤40 DEG C that in the desirable spontaneous combustion coal Cooling Tower of Power Station of humid air, warp and recirculated cooling water generation caloic exchange; RH>=85%), or humid air (T≤35 DEG C after work of water sprinkling for better material moisture; RH>=80%), also directly can take from Low Temperature Wet air (T≤25 DEG C in atmospheric environment; RH>=60%).The dust-laden droplet of condensation growth enters fog drip gathering device D, and by the droplet cleaning solution that sprays into remove the dust-laden droplet of condensation growth, the liquid-gas ratio controlled in fog drip gathering device is 1 ~ 5L/Nm 3, then to trap after cleaning solution droplet by the exhanst gas outlet at desulfurizing tower 1 top through smoke stack emission through fog drip gathering device demister 7.Cleaning solution after trapping dust-laden droplet and mist eliminator flushing water come together in doctor solution zoneofoxidation A through overflow pipe 8 part after being collected by cleaning solution collector 5, and part is as the flushing water of mist separator of desulfurization 3.

Embodiment 2:

As shown in Figure 2, as different from Example 1, fog drip gathering device D and flue gas desulfurization wash mill are split type setting, and flue gas desulfurization wash mill is desulfurizing tower 1, and desulfurizing tower 1 only comprises doctor solution zoneofoxidation A, desulfurization scrubbing section B and steam phase change zone C; Described fog drip gathering device can be the structures such as spray scrubber, stuffing washing tower, Venturi scrubber, cleaning solution after trapping dust-laden droplet and mist eliminator flushing water section recycle through droplet detergent circulator 10, and part returns doctor solution zoneofoxidation A or the flushing water as mist separator of desulfurization 3.All the other are with embodiment 1.

Embodiment 3:

Flue gas is produced by fully-automatic coal-fired boiler, and exhaust gas volumn is 300Nm 3/ h, desulfurizing tower adopts the spray column of tower diameter 200mm, tower height 4500mm, three grades of sprays, liquid-gas ratio 18L/Nm 3, Wet Flue Gas Desulfurization Technique is limestone-gypsum method.Desulfurizing tower top arranges steam phase change zone and fog drip gathering device, installs deflection plate demister between steam phase change zone and desulfurization scrubbing section; Be provided with cleaning solution collector between steam phase change zone and fog drip gathering device, cleaning solution collector is communicated with doctor solution zoneofoxidation by overflow pipe, is provided with humid air distributor in the middle part of steam phase change zone; Droplet trapping installs two pieces of metal perforated plate corrugated regular fillers in district, and packing specific area is 250m 2/ m 3, packing layer height overall 500mm; DP type (heavy duty detergent) mesh mist eliminator is installed in fog drip gathering device outlet, and demister height 150mm, demister is specific area 625m 2/ m 3.The ash-laden gas that fully-automatic coal-fired boiler produces removes through electric cleaner the desulfurization scrubbing section entering desulfurizing tower after meal dirt, with limestone desulfurization slurries counter current contacting; Flue gas removes SO through desulfurization scrubbing section 2after enter steam phase change chamber, fog drip gathering device successively.Through the parallel full-automatic smoke dust sampler test of WJ-60B type Pitot tube, desulfurizing tower outlet dust total concentration is 42mg/m 3; Wherein, adopt Electrical low pressure impactor ELPI on-line testing, desulfurizing tower outlet PM 2.5mass concentration is 16mg/m 3.By humid air distributor at the every Nm in steam phase change zone 30.15Nm is injected in flue gas 3humid air, humid air temperature 18 DEG C (lower than desulfurization neat stress 45 DEG C), humid air relative humidity is 70%, droplet scrubbing section spray 0.6m 3/ h washings (liquid-gas ratio 2L/Nm 3); After tested, desulfurizing tower outlet dust total concentration, PM 2.5mass concentration is down to 18mg/m respectively 3, 8mg/m 3.

Claims (9)

1. one kind promotes PM in wet desulphurization neat stress 2.5the desulfurizer removed, it is characterized in that, described desulfurizer is that a flue gas desulfurization wash mill and a fog drip gathering device are composed in series, and described flue gas desulfurization wash mill is followed successively by doctor solution zoneofoxidation, desulfurization scrubbing section, steam phase change zone from bottom to top; Be provided with oxidation air import in doctor solution zoneofoxidation, supplement desulfurizing agent import and the outlet of desulfurization cleaning solution; Smoke inlet, the import of desulfurization cleaning solution, mist separator of desulfurization and mist separator of desulfurization rinse water arrangement is disposed with from lower to upper at desulfurization scrubbing section; Humid air distributor is provided with in the middle part of steam phase change zone; Described fog drip gathering device and flue gas desulfurization wash mill are integral type structure, be arranged on flue gas desulfurization wash mill, described fog drip gathering device is provided with cleaning solution collector, cleaning solution overfall, the import of droplet cleaning solution, fog drip gathering device demister and droplet mist eliminator flushing water device and exhanst gas outlet from bottom to top successively, and cleaning solution overfall is connected with doctor solution zoneofoxidation with mist separator of desulfurization rinse water arrangement by overflow pipe.
2. PM in promotion wet desulphurization neat stress according to claim 1 2.5the desulfurizer removed, is characterized in that, described steam phase change zone size need meet the flue gas time of staying wherein and be more than or equal to steam at PM 2.5surface coring condensation growth required time.
3. PM in promotion wet desulphurization neat stress according to claim 1 2.5the desulfurizer removed, it is characterized in that, described fog drip gathering device and flue gas desulfurization wash mill replace with split-type structural, and described fog drip gathering device is provided with gas approach, the outlet of droplet cleaning solution, the import of droplet cleaning solution, fog drip gathering device demister and droplet mist eliminator flushing water device and exhanst gas outlet from lower to upper successively.
4. PM in the promotion wet desulphurization neat stress according to claim 1 or 3 2.5the desulfurizer removed, is characterized in that, described fog drip gathering device also installs 1 ~ 2 laminate ripple or ripple silk net structured packing additional, and packing specific area is 125 ~ 375m 2/ m 3, every layer of filler loading height is 500 ~ 1000mm.
5. PM in the promotion wet desulphurization neat stress according to claim 1 or 3 2.5the desulfurizer removed, it is characterized in that, described humid air distributor is made up of humid air supervisor, arm and bracing frame, in the sector region of same supervisor or tube section 90 ~ 120 °, evenly at least 3 qi-emitting holes are set, qi-emitting hole is 200 ~ 500mm along the pitch of holes of humid air supervisor or arm axis, and the aperture of qi-emitting hole is 3 ~ 10mm.
6. an application rights requires PM in 1 ~ 5 arbitrary promotion wet desulphurization neat stress 2.5the sulfur method of the desulfurizer removed, is characterized in that, removes step to be: flue gas enters rear and desulfurization cleaning solution counter current contacting by desulfurization scrubbing section bottom, by water-vapo(u)r saturation or close to saturated after desulfurization scrubbing section, and cigarette temperature drop to 55 ~ 70 DEG C; Then enter steam phase change zone after removing desulfurization slurry droplet by mist separator of desulfurization, inject humid air through humid air distributor, caloic occurs between humid air and desulfurization neat stress and exchanges, make desulfurization neat stress reach hypersaturated state, supersaturated vapor is at PM 2.5there is coring condensation in surface, makes PM 2.5become the dust-laden droplet of surface coverage one deck liquid film, particle diameter increases, the dust-laden droplet of condensation growth enters fog drip gathering device, removed the dust-laden droplet of condensation growth by the droplet cleaning solution sprayed into, then discharged by exhanst gas outlet by the flue gas after fog drip gathering device demister trapping cleaning solution droplet.
7. application according to claim 6 promotes PM in wet desulphurization neat stress 2.5the sulfur method of the desulfurizer removed, it is characterized in that, described humid air addition is 10 ~ 25% of desulfurization neat stress volume, humid air temperature is lower than desulfurization neat stress more than 20 DEG C, humid air relative humidity RH>=60%, after mixing with humid air to make desulfurization neat stress, flue gas degree of supersaturation S increases to S=1.05 ~ 1.20 by S ≈ 1.00.
8. application according to claim 7 promotes PM in wet desulphurization neat stress 2.5the sulfur method of the desulfurizer removed, it is characterized in that, described humid air take from coal fired power plant cooling tower through and T≤40 that exchange of recirculated cooling water generation caloic DEG C, RH>=85% humid air, or T≤35 after work of water sprinkling for better material moisture DEG C, RH>=80% humid air, or directly take from T≤25 in atmospheric environment DEG C, RH>=60% Low Temperature Wet air.
9. application according to claim 7 promotes PM in wet desulphurization neat stress 2.5the sulfur method of the desulfurizer removed, is characterized in that, the liquid-gas ratio in fog drip gathering device controls at 1 ~ 5L/Nm 3; Cleaning solution after trapping dust-laden droplet and mist eliminator flushing water come together in doctor solution zoneofoxidation through overflow pipe part after being collected by cleaning solution collector, and part is as the flushing water of mist separator of desulfurization.
CN201410022770.6A 2014-01-17 2014-01-17 PM in a kind of promotion wet desulphurization neat stress 2.5the desulfurizer removed and method thereof CN103721548B (en)

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