CN105381703B - A kind of bubble tower and method for carrying out wet process of FGD - Google Patents

A kind of bubble tower and method for carrying out wet process of FGD Download PDF

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Publication number
CN105381703B
CN105381703B CN201510937315.3A CN201510937315A CN105381703B CN 105381703 B CN105381703 B CN 105381703B CN 201510937315 A CN201510937315 A CN 201510937315A CN 105381703 B CN105381703 B CN 105381703B
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tower
bubbling
bubble
pipe
flue gas
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CN105381703A (en
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莫建松
王岳军
李泽清
陈美秀
吴忠标
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Zhejiang Tianlan Environmental Protection Technology Co Ltd
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Zhejiang Tianlan Environmental Protection Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/302—Sulfur oxides

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a kind of bubble tower and method for carrying out wet process of FGD, bubble tower includes absorption tower, bubbling mechanism is provided with absorption tower, the external gas approach of bubbling mechanism, gas approach interior edge flue gas flow direction sets gradually humidification spraying mechanism and pre- dedusting mechanism, bubbling mechanism includes entering cigarette district by the closing that upper spacer, lower clapboard and absorption inner wall of tower surround, and closes into cigarette district and connects gas approach；Some bubbling pipes arranged vertically, the upper end of all bubbling pipes is through lower clapboard is connected with entering cigarette district, lower end is stretched into tower reactor；Some blast pipes arranged vertically, all blast pipes are arranged through upper spacer and lower clapboard and with bubbling pipe dislocation；Pipe network is rinsed, interior and positioned at the bubbling pipe entrance top, the flush pipe into cigarette district is arranged at and some atomizers is set on the net.The present invention is used to carry out wet desulphurization to flue gas, mainly solves the technical problem that the easy fouling and clogging of bubbling pipe of existing bubble tower influences bubble tower normal operation.

Description

A kind of bubble tower and method for carrying out wet process of FGD
Technical field
The present invention relates to flue gas desulfurization technique field, and in particular to a kind of dress that wet process of FGD is carried out using bubble tower Put and method.
Background technology
Flue gas desulfurization technique can be divided into wet method, dry method, three kinds of semidry method, and wherein Wet Flue Gas Desulfurization Technique turns into main cigarette Desulfurization mode.At present, the conventional desulfurizing tower in domestic and international coal-burning power plant, mainly there is spray apertures tower, packed tower etc..
Successively multinomial patent research bubble tower Wet Flue Gas Desulfurization Technique is applied in Beijing Boqi Power Technology Co.Wherein The Chinese utility model patent of Application No. 200720309256.6 discloses a kind of flue gas desulphurization system, and desulfurizing tower uses bubbling Tower, device is transformed at gas cooler, from top to bottom provided with process water moisturizing spraying layer, accident cool water shower Layer and gas cooler spraying layer, flue gas is carried out outside bubble tower using lime stone slurry by way of adjusting sprayed slurry Cooling and pre- desulfurization, so as to reduce the desulfuration efficiency of whole system；The Chinese invention of Application No. 200810226157.0 is special Profit discloses bubble tower as desulfurizer and application thereof, using red mud as absorbent, using the side sprayed, bubbling is combined Formula removes to the sour gas in dusty gas.Sour gas enters from tower body top, after spray, bubbling from tower body The exhaust outlet discharge that bottom connects with tower body side wall.
Bubble tower has the advantages of perforation gas flow rate is high, gas-liquid contact is abundant, desulfuration efficiency is high.But the application of bubble tower It cannot get large-scale popularization and application always and be primarily present following shortcoming：1. bubble tower is as desulfurizer, undersaturated heat Flue gas causes system normal from bubble holes through dry and wet interface blocking bubbling pipe when being contacted with desulfurization slurry, is easily formed Operation, bubbling absorber desulfurization device outage rate are high；2. bubbling pipe requires the dust concentration of flue gas higher, higher dust from bubbling Pipe can be progressively adhered to after entering on the inside of bubbling pipe, and with the increase of system operation time, flue gas area of passage is gradually reduced, and taken off Sulphur device resistance is steeply risen, and larger potential safety hazard is caused to blower fan and boiler；3. bubble tower is different from spray column, it reacts Area is in bubble level, the acidic flue gas rapid pH for reducing bubble level region slurries, tower reactor after bubble level and desulfurizer slurry reaction Solution can not mix rapidly, and bubble level desulfuration efficiency can not be continual and steady；4. the desulfuration efficiency of bubble tower and the thickness of bubble level Have a great influence, when boiler load, which changes, causes exhaust gas volumn to change, bubble level can also change therewith, and traditional bubble tower is difficult Ensure desulfuration efficiency when exhaust gas volumn changes.
The content of the invention
In view of the above-mentioned problems, the invention provides a kind of bubble tower and method for carrying out wet process of FGD, mainly solve The easy fouling and clogging of bubbling pipe of existing bubble tower influences the technical problem of bubble tower normal operation.
A kind of bubble tower for carrying out wet process of FGD, including top set the absorption tower of exhanst gas outlet, the absorption tower Inside from top to bottom it is followed successively by demister, bubbling mechanism and tower reactor, the external gas approach of bubbling mechanism, in the gas approach Setting gradually humidification spraying mechanism and pre- dedusting mechanism, the bubbling mechanism along flue gas flow direction includes：
The upper spacer and lower clapboard absorbed on inner wall of tower is fixed on, what the upper spacer, lower clapboard and absorption inner wall of tower surrounded Closed cavity is into cigarette district, and the gas approach enters cigarette district with this and is connected；
Some bubbling pipes arranged vertically, the upper end of all bubbling pipes is through lower clapboard is connected with entering cigarette district, lower end is stretched into In tower reactor；
Some blast pipes arranged vertically, all blast pipes are arranged through upper spacer and lower clapboard and with bubbling pipe dislocation；
Pipe network is rinsed, interior and positioned at the bubbling pipe the entrance top into cigarette district is arranged at, if the flush pipe is set on the net Dry nebulization nozzle.
For existing bubble tower bubbling pipe easy fouling and clogging the problem of, in order to prevent high-temperature flue gas with slurries in bubble holes Place forms dry and wet interface and blocks bubble holes, Inlet dust blocking bubbling inside pipe wall, and the present invention sets humidification spray in gas approach Area's (installation humidification spraying mechanism) is cooled to inlet flue gas, is humidified, and sets pre- dedusting area (installing pre- dedusting mechanism) to increasing Flue gas after wet cooling carries out pre- dedusting；Rinse spray is set up in the air inlet area of bubbling mechanism, spray liquid is in air inlet area to flue gas Further cooling dedusting is carried out, while one layer of stable liquid film is formed in bubbling inside pipe wall, prevents dust adhesion in bubbling pipe The occurrence of wall, while the flue gas volume after cooling declines, and reduces the perforation gas velocity of flue gas, increases gas-liquid contact time, Improve the desulfuration efficiency of bubble tower.
Preferably, the flushing pipe network is made up of some wash tub pipes being evenly arranged, below every wash tub pipe Even several atomizers of setting, the injection direction of atomizer is down.The present invention sets some uniform cloth above bubbling pipe The wash tub pipe put, water droplet after atomization further cools to entering cigarette flows under the influence of gravity into drum after dedusting through bubbling inside pipe wall Alveolar layer, and one layer of stable liquid film is formed in bubbling inside pipe wall, prevent dust adhesion bubbling inside pipe wall from causing blocking.Wash tub pipe Liquid-gas ratio is 0.5-2L/Nm3。
Preferably, the humidification spraying mechanism includes 2~3 layers of shower, and every layer of shower is set along the radial direction of gas approach Put.
Nozzle is uniformly arranged on the shower.The reverse flue gas flow direction of injection direction of nozzle.
Preferably, for the pre- dedusting mechanism to fold plate shape demister, the lower section for folding plate shape demister sets collecting tank, The sump bottom passes through in pipeline connection to the tower reactor.Collecting tank is preferably prominent to flue lower section and is one with flue The angle of the centrum closed cavity of body mechanism, centrum closed cavity outer wall and horizontal plane is 30-60 degree.
Preferably, the gas approach sets humidification spraying mechanism section to be inclined upwardly relative to the pre- dedusting mechanism section of setting 10-20 degree.Prevent slurries from flowing backwards, deposition.
On the basis of solving the problems, such as the easy fouling and clogging of bubbling pipe, to further enhance the desulfuration efficiency of bubble tower, preferably Ground, some bubble holes, the hole of the bubble holes are opened up on the tube wall of the bubbling pipe and at the 20-500mm of bubbling pipe bottom Footpath is 20-30mm, and the spacing between adjacent bubble holes is 5-30mm.Flue gas is bloated by bubble holes, enable bubble more uniformly with Absorb slurry liquid contacts.It is further preferred that two row's bubble holes are opened up on the tube wall of bubbling pipe.
For further stably desulphurizing efficiency, it is preferable that the porous cowling panel being additionally provided with above the bubble holes, it is described The perforate of porous cowling panel includes bubbling pipe and flows through via through hole is gentle.The porous cowling panel is horizontally installed in absorption tower On wall.
It is further preferred that the porous cowling panel overdraught through hole aperture be 15-45mm, air-flow opens through hole Porosity is 20%-40%, and porous cowling panel is 30-100mm apart from the height of bubble holes.Highly refer to the most upper row's drum of distance herein The height at abscess center.
Bubble holes of the flue gas through bubbling pipe enter bubble level and carry out blistering reaction, the flue gas bubble after perforation with desulfurization slurry By bubble level, the cowling panel of some apertures, flue gas bubble quilt when through cowling panel are being provided with the middle part of bubble level among setting Aperture in cowling panel crushes, and greatly improves gas liquid interfacial area, and the sulfur dioxide in flue gas is desulfurized slurries efficient absorption.
During using bubble tower as desulfurizer, flue gas forms substantial amounts of air after bubbling pipe enters slurries in slurries Bubble, is crushed suddenly after floating to liquid level, causes liquid level to produce compared with macrorelief.The bubble holes positional distance liquid level of bubbling pipe itself compared with Small, larger liquid level, which rises and falls, easily causes pressure inequality at bubble holes, and air flow method is uneven, further produces liquid level bigger Fluctuating, the two influences each other, and desulfuration efficiency, the efficiency of dust collection for ultimately causing desulphurization system are relatively low.Therefore asked to solve this Topic, the present invention set up orifice plate above bubbling pipe, and bubble floating process is obstructed by orifice plate, and air pocket is fractured into minute bubbles, Air-flow is redistributed, and finely dispersed minute bubbles float to liquid level through orifice plate, and increase gas liquid interfacial area improves desulfurization effect Rate, while voltage stabilizing is realized to liquid level, prevent that liquid fluctuating is excessive, influence bubble tower running resistance and the stabilization of desulfuration efficiency.
For the contact homogeneity for further enhancing bubble with absorbing slurries, stably desulphurizing efficiency, it is preferable that described porous whole The pulp-inlet pipe net of external absorbing liquid transfer pipeline is set above flowing plate, slurries hole is uniformly opened up on the pulp-inlet pipe.Slurries hole Opening ensures that bubbling layer cross section enters slurry uniformly, prevents that bubble level pH value is too low towards pulp-inlet pipe side off the net.
The present invention sets some slurry inlet pipes in the middle part of bubble level, and some slurries are uniformly set below every slurry inlet pipe Hole, desulfurizer slurry by slurries hole even into bubbling layer cross section everywhere, prevent that bubble level slurry pH value difference is larger, slurries Hole aperture is 10-25mm, and the perforation flow velocity of slurries is 5-8m/s.
It is further preferred that the air pipe network positioned at tower reactor is additionally provided with, the external oxidation fan of air pipe network.Enter one Step is preferred, and air pipe network is made up of some air hoses being evenly arranged, and venthole is uniformly opened up on air hose.
The present invention sets up oxidation air reaction zone below bubble level, and timely oxidation sweetening reacts the sulphite of generation, Prevent that the calcium sulfite compared with low solubility from wrapping up sorbent particle, keeps the activity of desulfurizing agent.
Preferably, outer circulation pump, the outer circulation pump stock inlet connection tower reactor top, the outer circulation are set outside tower reactor The grout outlet of pump is connected with being arranged on the slurries shower nozzle of bottom in tower reactor.It is further preferred that the air network collocation Between the stock inlet connectivity part of outer circulating pump and slurries shower nozzle.
Outer circulation pump is set outside tower reactor, pulse suspension area is internally formed in tower reactor, ensures that slurries mix rapidly in tower reactor, surely Determine the pH value of tower reactor slurries.
Preferably, the overflow mechanism for adjusting liquid level in tower reactor, the overflow mechanism are additionally provided with outside the absorption tower Entrance connected with tower reactor bottom.
It is further preferred that the overflow mechanism includes：
Overflow launder, the isopipe root are communicated to tower reactor bottom；
Baffle plate adjusting device, to adjust the liquid level in overflow launder.
It is further preferred that the entrance and exit of overflow launder is opened in bottom land, by being inserted from bottom land between entrance and exit Enter and the adjustable baffle plate of height of baffle plate separates, baffle plate side is feed zone, and opposite side is discharge zone, and the entrance of overflow launder is communicated to Tower reactor bottom.
Overflow mechanism entrance is located at the bottom of bubble tower tower reactor, and tower reactor slurries enter slurry from ullage, and tower reactor bottom is discharged, Be advantageous to the control to absorbed layer slurry pH value, ensure desulfuration efficiency.Baffle plate adjusting device is set at the top of overflow mechanism, adjusted The height of height of baffle plate control reaction zone bubble level is saved, when inlet flue gas quantitative change is big, sulfur dioxide concentration raises, appropriate rise Height of baffle plate, increase bubble level thickness ensure desulfuration efficiency；When inlet flue gas amount diminishes, sulfur dioxide concentration reduces, suitably Height of baffle plate is reduced, desulfuration efficiency can be met by reducing bubble level thickness, reduce the energy consumption that SR saves blower fan.
The present invention sets adjustable overflow mechanism, when inlet flue gas amount and flue gas concentration change, kept off by adjusting The height control tower bottoms position of plate, ensures the stabilization of desulfuration efficiency and running resistance, the desulfurization slurry after reaction completely is by absorbing Tower bottom overflow goes out outside tower；Desulfurizer slurry entrance is set in bubble level area, desulfurizing agent is by the form of pipe network to bubble level area The uniform cloth liquid in domain, ensure that bubble level pH value obtains uniformly.
The present invention also provides a kind of method that wet process of FGD is carried out using the bubble tower, comprises the following steps：
Flue gas carries out being sent into absorption tower after spray humidification and pre- dedusting entering cigarette district successively in gas approach, into entering Flue gas in cigarette district is entered in the desulfurization slurry in tower reactor by bubbling pipe, forms bubble, is reacted with absorbing slurry liquid contacts, instead Bubble floating after answering forms air-flow after being crushed to liquid level, and air-flow rises through blast pipe, is obtained after then carrying out demisting dedusting Neat stress, neat stress are gone out by absorbing tower top row；Rinse pipe network and spray washing is carried out to bubbling inside pipe wall；Slurries warp in tower reactor Discharged after oxidation.
Preferably, the liquid-gas ratio for rinsing pipe network spray washing is 0.5-2L/Nm3。
Preferable method, comprises the following steps：
Flue gas carries out spray humidification and the cigarette district of entering initially entered after pre- dedusting in bubble tower successively in gas approach, then Into bubbling pipe, enter desulfurization slurry from bubble holes via bubbling pipe, form bubble, bubble floating, hindered by porous cowling panel Every air pocket is fractured into minute bubbles, and air-flow is redistributed, and finely dispersed minute bubbles float to liquid through porous cowling panel Face, crush；The air-flow that bubble breaking is formed continues to rise, and through blast pipe, by demister, forms clean flue gas and is gone out by flue gas Mouth discharge.
Bubble floating process contacts with desulfurization slurry, and sulfur dioxide, dust in flue gas etc. enter desulfurization slurry, completes to inhale Receipts process.Fresh slurry enters bubble tower by injection point, desulfurization slurry pH value in bubble tower is adjusted, in suitable pH value Under, wind action is stirred and aoxidized through tower reactor side, and the calcium sulfite that sulfur dioxide absorption is formed is aoxidized, crystallized, is formed Gypsum.Desulfurization slurry after the completion of reaction is discharged from bubble tower bottom slurry hole, into aftertreatment systems.
The present invention sets up humidification spraying mechanism and pre- dedusting mechanism in gas approach, while to bubbling in bubbling mechanism Inside pipe wall carries out the flushing pipe network of spray washing, prevents high-temperature flue gas from forming dry and wet interface at bubble holes with slurries and blocking bubbling Hole, Inlet dust block bubbling inside pipe wall, while increase gas-liquid contact time, improve the desulfuration efficiency of bubble tower；In bubble level Cowling panel is set up, increase gas liquid interfacial area improves desulfuration efficiency, while realizes voltage stabilizing to liquid level, ensures the steady of desulfuration efficiency It is fixed；Oxidation air reaction zone is set up below bubble level, the sulphite of timely oxidation sweetening reaction generation, keeps desulfurizing agent Activity；Pulse suspension area is set up inside tower reactor, ensures that slurries mix rapidly in tower reactor, the pH value of stable tower reactor slurries；In tower Bottom portion sets adjustable overflow mechanism, and bubbling layer height is adjusted according to flue gas flow；In bubble level area, desulfurizer slurry is set Entrance, desulfurizing agent, to the uniform cloth liquid in bubble level region, ensure the uniform of bubble level pH value by the form of pipe network.
Respectively set up between part and mutually cooperate with above, in the same of the easy fouling and clogging of bubbling pipe for solving the problems, such as existing bubble tower When keep stable desulfuration efficiency, the present invention it is above-mentioned it is each improve between act synergistically under, have compared with prior art as follows Beneficial effect：
(1) humidification spray and pre-dedusting device are set in gas approach, humidifying cooling is carried out to inlet flue gas, it is effective to solve High temperature unsaturation flue gas goes out to be formed the problem of dry and wet interface blocks bubble holes in bubble holes, ensures system stable operation.
(2) pre-dedusting device is set in gas approach, inlet flue gas dust concentration is greatly reduced, it is effective to solve powder in flue gas Dirt adhesion bubbling inside pipe wall causes the blockage problem of bubbling pipe.
(3) some wash tub pipes are set to carry out further cooling, dedusting to flue gas in air inlet area, in bubbling inside pipe wall shape The anti-dust that prevents of the liquid film stable into one layer is enriched with bubbling inside pipe wall, and when reducing flue gas flow rate increase bubble level gas-liquid contact Between, improve desulfuration efficiency.
(4) cowling panel is set above bubble holes, prevents bubble level big amplitude wave of liquid level caused by flue gas pressures are uneven It is dynamic to cause local liquid level difference excessive, cause local bubble holes gas velocity is excessive to cause desulfuration efficiency unstable；It is some in cowling panel Aperture further crushes to rising bubble in bubble level, increases gas liquid interfacial area, improves bubble level desulfuration efficiency.
(5) slurry form is supplied using pipe network, the desulfurizer slurry realized into bubble level is uniformly distributed in bubble level, is ensured Bubble level region slurries are homogeneous, desulfuration efficiency is stable.It is relatively low unmanageable effectively to solve bubble tower bubble level slurry pH value The problem of.
(6) entrance of overflow mechanism is set in bubbling tower bottom, and whole bubble tower region slurries flow from top into bottom Go out, be advantageous to the control to bubble level pH value.Baffle plate adjusting device is set at the top of overflow mechanism, can be according to inlet flue gas amount Bubble level thickness is adjusted for change and sulfur dioxide concentration change, greatly improves the adaptation that bubble tower changes to flue gas condition Scope, the operation energy consumption of bubble tower is reduced, solve the problem that bubble tower does not adapt to flue gas load change.
Brief description of the drawings
Fig. 1 is the structural representation of inventive bubble column.
Fig. 2 is the structural representation of bubbling mechanism section part (arrow show gas flow in figure).
Fig. 3 is upper spacer top view.
Fig. 4 is lower clapboard top view.
Reference is as follows shown in figure：
1- absorption towers 2- gas approach 3- humidification spraying mechanisms
41- pre-duster 42- collecting tank 5- demisters
61- upper spacers 62- enters cigarette district 63- blast pipes
The porous cowling panels of 64- bubbling pipe 65- bubble holes 66-
67- lower clapboards 68- rinses pipe network
7- pulp-inlet pipe net 8- air pipe network 9- overflow mechanisms
Embodiment
As shown in Figure 1 to 4, a kind of bubble tower, including absorption tower 1, be from top to bottom followed successively by absorption tower 1 demister 5, Bubbling mechanism and tower reactor, demister are the conventional demister of wet absorption tower.
Bubbling mechanism includes upper spacer 61, lower clapboard 67, bubbling pipe 64, blast pipe 63, flushing pipe network 68 and porous rectification Plate 66.
Upper spacer 61 and lower clapboard 67 are fixed on the inwall on absorption tower, midfeather certain distance, upper spacer, lower clapboard And it is into cigarette district to absorb the closed cavity that inner wall of tower surrounds, some bubbling pipes 64 arrange that the upper end of all bubbling pipes is stretched vertically Enter connected with closed cavity in closed cavity, lower end stretches into liquid level lower section, some blast pipes 63 in tower reactor and runs through upper and lower dividing plate, It will be connected below lower clapboard with the space above upper spacer, blast pipe and bubbling pipe interlaced arrangement.
Pipe network 68 is rinsed entering in cigarette district and being set positioned at the top of bubbling pipe upper port, it is uniform by some to rinse pipe network The wash tub pipe composition of arrangement, every wash tub pipe lower section are uniformly arranged several atomizers, and atomizer sprays direction Down.
Two rows bubble holes 65 are opened up on the tube wall of bubbling pipe, bubble holes are apart from bubbling pipe bottom 200-500mm, bubbling The aperture in hole is 20-30mm, and the spacing between adjacent bubble holes is 20-50mm.
Porous cowling panel 66 is set above bubble holes, and porous cowling panel is horizontally installed to absorb on inner wall of tower, porous rectification The perforate of plate includes bubbling pipe and flows through via through hole is gentle, and air-flow is 15-45mm through the aperture in hole, and air-flow is opened through hole Porosity is 20%-40%, and porous cowling panel is 30-100mm apart from the height of bubble holes.
The pulp-inlet pipe net 7 of the external absorbing liquid transfer pipeline of setting, pulp-inlet pipe net 7 are uniform by some above porous cowling panel The pulp-inlet pipe composition of arrangement, uniformly opens up slurries hole on pulp-inlet pipe, and slurries hole aperture is 10-25mm, the opening direction in slurries hole Pulp-inlet pipe side off the net.
Positioned at tower reactor, air pipe network 8 is set, the external oxidation fan of air pipe network, what air pipe network was evenly arranged by some Air hose is formed, and venthole is uniformly opened up on air hose.
Bubbling area (bubble holes region) and oxidation stirring area (air pipe network location are from top to bottom followed successively by tower reactor Domain), serum outlet sets an outer circulation pump, the connection of outer circulation pump stock inlet positioned at oxidation stirring area outside oxidation stirring area Top in tower reactor, the grout outlet of outer circulation pump are connected with being arranged on the slurries shower nozzle of bottom in tower reactor, air network collocation Between the stock inlet connectivity part of outer circulating pump and slurries shower nozzle, pulse stirring is formed in stirring area.
The external overflow mechanism 9 in bottom of stirring area, overflow mechanism 9 include an overflow launder and a controllable register, overflow The entrance and exit of groove is opened in bottom land, by being inserted from bottom land and adjustable for height baffle plate separates, gear between entrance and exit Plate side is feed zone, and opposite side is discharge zone, and the entrance of overflow launder is communicated to tower reactor bottom, and the slurries from tower reactor enter Expect area, out of controllable register top overflow to discharge zone, flow to outlet and discharge, the height adjustable in baffle plate insertion overflow launder, from And the liquid level in overflow launder is adjusted, reach the purpose of liquid level in regulation tower reactor.
Gas approach 2 connects with the cigarette district of entering of bubbling mechanism, and gas approach interior edge flue gas flow direction sets gradually humidification spray Mechanism 3 and pre- dedusting mechanism, humidification spraying mechanism include 2~3 layers of shower, and every layer of shower is set along the radial direction of gas approach Put, nozzle is uniformly arranged on shower, the injection direction of nozzle is connected towards flue gas flow direction, shower by slurries pump and tower reactor It is logical.Pre- dedusting mechanism is folds plate shape demister 41, and the lower section for folding plate shape demister sets collecting tank 42, and sump bottom is led to Cross in pipeline connection to tower reactor, collecting tank is to centrum closed cavity prominent and that mechanism is integrated with flue below flue, vertebra The angle of body closed cavity outer wall and horizontal plane is 30-60 degree, and gas approach sets humidification spraying mechanism section pre- relative to setting Dedusting mechanism section is inclined upwardly 10-20 degree.
The technological process of the present invention is as follows：
Flue gas initially enters in bubble tower after carrying out spray humidification and pre- dedusting successively in gas approach 2 and enters cigarette district, Bubbling pipe 64 is entered back into, enters desulfurization slurry from bubble holes 65 and bubbling bottom of the tube via bubbling pipe, forms bubble, on bubble It is floating, obstructed by porous cowling panel 66, air pocket is fractured into minute bubbles, and air-flow is redistributed, finely dispersed minute bubbles Liquid level is floated to through porous cowling panel, is crushed；The air-flow that bubble breaking is formed continues to rise, through blast pipe 63, by except Day with fog 5, form clean flue gas and discharged by exhanst gas outlet.
Bubble floating process contacts with desulfurization slurry, and sulfur dioxide, dust in flue gas etc. enter desulfurization slurry, completes to inhale Receipts process, fresh slurry enter bubble tower by injection point (ullage), adjust desulfurization slurry pH value in bubble tower, suitable Under suitable pH value, wind action is stirred and aoxidized through tower reactor side, and the calcium sulfite that sulfur dioxide absorption is formed is aoxidized, through knot Crystalline substance, form gypsum.Desulfurization slurry after the completion of reaction is discharged from bubble tower bottom slurry hole, into aftertreatment systems.
Liquid level is adjusted by overflow mechanism in tower reactor.
Embodiment 1：
2 75T heating boilers flue-gas desulfurizing engineerings of certain printing and dyeing mill use this technique, SO in flue gas2Concentration is 2316mg/ Nm3, dust concentration 85mg/Nm3, flue-gas temperature is 142 DEG C；Humidification spray liquid-gas ratio is 2.8L/Nm3, bubble holes aperture is 25mm, rectification panel aperture are 30mm, and percent opening 30%, wash tub pipe liquid-gas ratio is 1.5L/Nm3；Slurries hole aperture is 15mm； Desulfuration efficiency is 98.9%, and outlet dust content is 3.7mg/Nm3。
Embodiment 2：
Certain steam power plant, 1 130T boiler flue gas desulfurizations engineering use this technique, SO in flue gas2Concentration is 3060mg/Nm3, Dust concentration is 122mg/Nm3, and flue-gas temperature is 118 DEG C；Humidification spray liquid-gas ratio is 2.4L/Nm3, bubble holes aperture is 30mm, rectification panel aperture are 30mm, and percent opening 33%, wash tub pipe liquid-gas ratio is 1.2L/Nm3；Slurries hole aperture is 18mm； Desulfuration efficiency is 99.2%, and outlet dust content is 4.1mg/Nm3。

Claims (6)

1. a kind of bubble tower for carrying out wet process of FGD, include the absorption tower that top sets exhanst gas outlet, in the absorption tower From top to bottom it is followed successively by demister, bubbling mechanism and tower reactor, the external gas approach of bubbling mechanism, it is characterised in that described Gas approach interior edge flue gas flow direction, which sets gradually humidification spraying mechanism and pre- dedusting mechanism, the bubbling mechanism, to be included：
It is fixed on the upper spacer and lower clapboard absorbed on inner wall of tower, the closing that the upper spacer, lower clapboard and absorption inner wall of tower surround Cavity is into cigarette district, and the gas approach enters cigarette district with this and is connected；
Some bubbling pipes arranged vertically, the upper end of all bubbling pipes is through lower clapboard connects with entering cigarette district, tower reactor is stretched into lower end It is interior；
Some blast pipes arranged vertically, all blast pipes are arranged through upper spacer and lower clapboard and with bubbling pipe dislocation；
Pipe network is rinsed, interior and positioned at the bubbling pipe the entrance top into cigarette district is arranged at, if the flush pipe sets dry fog on the net Change nozzle；
Some bubble holes, the hole of the bubble holes are opened up on the tube wall of the bubbling pipe and at the 20-500mm of bubbling pipe bottom Footpath is 20-30mm, and the spacing between adjacent bubble holes is 5-30mm；The porous rectification being additionally provided with above the bubble holes Plate, the perforate of the porous cowling panel include bubbling pipe and flow through via through hole is gentle；The porous cowling panel overdraught passes through The aperture in hole is 15-45mm, percent opening of the air-flow through hole is 20%-40%, and porous cowling panel is apart from the height of bubble holes 30-100mm；The pulp-inlet pipe net of external absorbing liquid transfer pipeline is set above the porous cowling panel, on the pulp-inlet pipe uniformly Open up slurries hole.
2. bubble tower according to claim 1, it is characterised in that the humidification spraying mechanism includes 2~3 layers of shower, often Layer shower being radially arranged along gas approach.
3. bubble tower according to claim 2, it is characterised in that the pre- dedusting mechanism folds to fold plate shape demister The lower section of plate shape demister sets collecting tank, and the sump bottom passes through in pipeline connection to the tower reactor.
4. bubble tower according to claim 1, it is characterised in that be additionally provided with the air pipe network positioned at tower reactor, the air hose Net external oxidation fan.
5. bubble tower according to claim 1, it is characterised in that be additionally provided with outside the absorption tower for adjusting liquid level in tower reactor The overflow mechanism of height, the entrance of the overflow mechanism connect with tower reactor bottom.
A kind of 6. method that wet process of FGD is carried out using bubble tower described in claim 1, it is characterised in that including following step Suddenly：
Flue gas carries out being sent into absorption tower after spray humidification and pre- dedusting entering cigarette district successively in gas approach, into entering cigarette district Interior flue gas is entered in the desulfurization slurry in tower reactor by bubbling pipe, forms bubble, is reacted with absorbing slurry liquid contacts, after reaction Bubble floating to liquid level it is broken after form air-flow, air-flow rises through blast pipe, and net cigarette is obtained after then carrying out demisting dedusting Gas, neat stress are gone out by absorbing tower top row；Rinse pipe network and spray washing is carried out to bubbling inside pipe wall；Slurries in tower reactor are oxidized After discharge.
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