CN108579396A - A kind of device and method of flue gas desulfurization - Google Patents
A kind of device and method of flue gas desulfurization Download PDFInfo
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- CN108579396A CN108579396A CN201810751440.9A CN201810751440A CN108579396A CN 108579396 A CN108579396 A CN 108579396A CN 201810751440 A CN201810751440 A CN 201810751440A CN 108579396 A CN108579396 A CN 108579396A
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- liquid column
- spraying
- flue gas
- desulfurization
- atomizing spray
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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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- 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
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The present invention provides a kind of devices of flue gas desulfurization, including：Absorption tower tower body；Absorption tower tower body lower part is equipped with smoke inlet, and top is equipped with exhanst gas outlet；Serum recycle device, liquid column-spraying device, high-efficient atomizing spray equipment and the demister being successively set on from bottom to top inside the absorbing tower body；The liquid column-spraying device is arranged above the smoke inlet；The liquid column-spraying device includes several liquid column-spraying branch pipes；Several described liquid column-spraying branch pipes one or more horizontal beddings inside the absorbing tower body are uniformly distributed；Each liquid column-spraying branch pipe bottom end is communicated with the serum recycle device, and top is equipped with liquid column-spraying nozzle；The inlet flue duct communicated with the smoke inlet；The flue gases duct communicated with the exhanst gas outlet.The device of flue gas desulfurization provided by the invention can realize the coordinated desulfurization effect of liquid column-spraying and high-efficient atomizing spray, have the advantages that desulfuration efficiency is high, desulfurization effect is good and energy-saving consumption-reducing.
Description
Technical field
The present invention relates to flue gas desulfurization technique fields, are to be related to a kind of device and method of flue gas desulfurization more specifically.
Background technology
As Environmental protection is increasingly paid attention to, to the emission request of the pollutant of the industries such as thermoelectricity, coking, chemical industry
It is increasingly stringenter.Currently, in flue gas desulfurization and denitrification industry, mainly there are dry desulfurization, semi-dry desulphurization and wet desulphurization etc.
Three kinds of desulfurization methods；Wherein, the wet desulphurization applied in Thermal Power Generation Industry in the world accounts for the above sulfur method application unit
80%；And lime stone-gypsum account in wet desulphurization 85% or more.Because of the atmosphere pollution discharge capacity of thermoelectricity, coking industry
The higher ratio that occupies is put, and lime stone-gypsum desulfurization is also very extensive in sector application, therefore to its technique
Optimization design, energy-saving and emission-reduction have great importance for entire environmental protection industry (epi).
Currently, the application and research to Wet Flue Gas Desulfurization Technique are all than wide.In Publication No. CN101564641A
State's patent discloses a kind of liquid column tower of sprinkling optimization, and desulfurization spraying cleaning solution is adjusted its main feature is that can be arranged inside spray tube
Homogenizing plate, to ensure that slurries spray height having the same；Although this design helps to ensure that injection nozzle in slurries
There is close or even identical pressure, but in practical implementation, the angle between homogenizing plate and slurry pipe is difficult in pipe
It determines, it is difficult to reach expected desulfuration efficiency, to limit further applying for the technical solution.And Publication No.
The Chinese patent of CN104084016A discloses a kind of two-step desulfurization liquid column tower, which is divided into 3 isolation wards by desulfurizer,
First Room is atomizing spray desulfurization, and second Room is liquid column-spraying desulfurization, and third room is demister part；Although this design is one
Determine to improve desulfuration efficiency in degree, but absorption tower the space occupied is larger, is not suitable for the flue gas desulfurization of big exhaust gas volumn.Separately
Outside, the Chinese patent of Publication No. CN202983508U discloses a kind of multistage multiple dimensioned injection apparatus of liquid column tower, process characteristic
For the injection nozzle of different model, height is arranged in absorption tower, it is increased that multilayer, drop radial sector are sequentially formed in tower body space
Drop dense layer forms multiple liquid curtain layers on different height in this way, and the liquid-drop diameter of lower layer is small, upwards by
Layer increases, and realizes quasi-continuous, multiple dimensioned multistage mass transport process；But the technology to desulfuration efficiency improve and energy-saving consumption-reducing it is positive
Effect is little.
In conclusion technical solution disclosed in the prior art be the exclusive use to spray scrubber and liquid column tower mostly with
And the two is separately optimized in technique, it still remains spray scrubber high energy consumption and liquid column tower desulfurization is halfway asks
Topic；Although individual technical solutions have carried out slurries injection and slurry spraying spray, but be answering in two different systems
With generation acts synergistically, and the absorption tower volume needed is larger, to the more demanding of place.
Invention content
In view of this, the purpose of the present invention is to provide a kind of device and method of flue gas desulfurization, high with desulfuration efficiency,
The advantages of desulfurization effect is good and energy-saving consumption-reducing, and occupied space is smaller, is suitble to high density pollution object and the flue gas of big flow de-
Sulphur.
The present invention provides a kind of devices of flue gas desulfurization, including：
Absorption tower tower body；Absorption tower tower body lower part is equipped with smoke inlet, and top is equipped with exhanst gas outlet；
It is successively set on serum recycle device inside the absorbing tower body, liquid column-spraying device, efficiently from bottom to top
Atomizing sprayer and demister；The liquid column-spraying device is arranged above the smoke inlet；The liquid column-spraying dress
It sets including several liquid column-spraying branch pipes；Several described liquid column-spraying branch pipes are one or more inside the absorbing tower body
Horizontal bedding is uniformly distributed；Each liquid column-spraying branch pipe bottom end is communicated with the serum recycle device, and top is equipped with fluid column
Spray nozzle；
The inlet flue duct communicated with the smoke inlet；
The flue gases duct communicated with the exhanst gas outlet.
Preferably, the serum recycle device includes：
Stock tank in absorption tower tower body bottom is set；Slurry circulating pump is equipped in the stock tank；
The reducer pipe communicated with each liquid column-spraying branch pipe；The diameter of the reducer pipe subtracts along slurries flow direction
It is small；
It is connected to the slurries pipeline of the slurry circulating pump and reducer pipe.
Preferably, several described liquid column-spraying branch pipes uniformly divide along two horizontal beddings inside the absorbing tower body
Cloth；The spacing distance of described two horizontal beddings is 0.8m~2m；2/m is arranged in each horizontal bedding2~4/m2Liquid column-spraying
Branch pipe.
Preferably, the high-efficient atomizing spray equipment includes：
Atomizing spray main pipe；
Several high-efficient atomizing nozzles being arranged around the atomizing spray main pipe；
The slurries spray pump communicated with the atomizing spray main pipe.
Preferably, the high-efficient atomizing nozzle is atomization solid-cone nozzle or atomization hollow cone nozzle.
Preferably, the liquid column-spraying device is arranged in the underface of the high-efficient atomizing spray equipment；The fluid column spray
The spacing distance of injection device and the high-efficient atomizing spray equipment is 3m~7m.
Preferably, the high-efficient atomizing spray equipment is arranged in the underface of the demister；The high-efficient atomizing spray
The spacing distance of shower device and the demister is 1.5m~3m.
Preferably, further include：
Import flue gas inspection point in the inlet flue duct is set；
Exiting flue gas test point in the flue gases duct is set；
The control room being connected respectively with the import flue gas inspection point and exiting flue gas test point.
The present invention also provides a kind of methods of flue gas desulfurization, include the following steps：
A) device described in above-mentioned technical proposal is used, pending flue gas is subjected to liquid column-spraying desulfurization, turbulent flow successively
Drop contact desulfurization and high-efficient atomizing spray desulfurization, then remove the drop in flue gas, obtain neat stress.
Preferably, the injection flow velocity of liquid column-spraying desulfurization described in step a) is 5m/s~14m/s, liquid-column height 0.8m
~6m, single layer liquid-gas ratio are 13L/m3~25L/m3。
The present invention provides a kind of devices of flue gas desulfurization, including：Absorption tower tower body；Absorption tower tower body lower part is equipped with
Smoke inlet, top are equipped with exhanst gas outlet；Be successively set on from bottom to top serum recycle device inside the absorbing tower body,
Liquid column-spraying device, high-efficient atomizing spray equipment and demister；The liquid column-spraying device is arranged on the smoke inlet
Side；The liquid column-spraying device includes several liquid column-spraying branch pipes；Several described liquid column-spraying branch pipes are along the absorption tower
One or more horizontal beddings are uniformly distributed inside tower body；Each liquid column-spraying branch pipe bottom end and the serum recycle device
It communicates, top is equipped with liquid column-spraying nozzle；The inlet flue duct communicated with the smoke inlet；The cigarette communicated with the exhanst gas outlet
Gas flue.Compared with prior art, the device of flue gas desulfurization provided by the invention uses specific structure and connection relation, Neng Goushi
The coordinated desulfurization effect of existing liquid column-spraying and high-efficient atomizing spray, desulfurization effect high with desulfuration efficiency be good and energy-saving consumption-reducing
Advantage, and occupied space is smaller, is suitble to the flue gas desulfurization of high density pollution object and big flow.
In addition, device provided by the invention can monitor each side's face data of flue gas in real time, and according to exhaust gas volumn, SO2It is dense
The data such as degree carry out speed regulating control to slurry circulating pump and slurries spray pump and reach energy-saving and emission-reduction to reduce desulfurization island energy consumption
Effect.
Description of the drawings
Fig. 1 is the structural schematic diagram of the device of flue gas desulfurization provided in an embodiment of the present invention；
Fig. 2 be flue gas desulfurization provided in an embodiment of the present invention device in liquid column-spraying nozzle pictorial diagram；
Fig. 3 is that the device of flue gas desulfurization provided in an embodiment of the present invention realizes the collaboration of liquid column-spraying and high-efficient atomizing spray
The schematic diagram of desulfidation.
Specific implementation mode
Below in conjunction with the embodiment of the present invention, technical scheme of the present invention is clearly and completely described, it is clear that institute
The embodiment of description is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts, belongs to this hair
The range of bright protection.
The present invention provides a kind of devices of flue gas desulfurization, including：
Absorption tower tower body；Absorption tower tower body lower part is equipped with smoke inlet, and top is equipped with exhanst gas outlet；
It is successively set on serum recycle device inside the absorbing tower body, liquid column-spraying device, efficiently from bottom to top
Atomizing sprayer and demister；The liquid column-spraying device is arranged above the smoke inlet；The liquid column-spraying dress
It sets including several liquid column-spraying branch pipes；Several described liquid column-spraying branch pipes are one or more inside the absorbing tower body
Horizontal bedding is uniformly distributed；Each liquid column-spraying branch pipe bottom end is communicated with the serum recycle device, and top is equipped with fluid column
Spray nozzle；
The inlet flue duct communicated with the smoke inlet；
The flue gases duct communicated with the exhanst gas outlet.
In the present invention, the device of the flue gas desulfurization includes absorption tower tower body, serum recycle device, liquid column-spraying dress
It sets, high-efficient atomizing spray equipment, demister, inlet flue duct and flue gases duct.Referring to Fig. 1, Fig. 1 carries for the embodiment of the present invention
The structural schematic diagram of the device of the flue gas desulfurization of confession.Wherein, 1 is absorption tower tower body, and 2 be smoke inlet, and 3 be exhanst gas outlet, and 4 are
Serum recycle device, 5 be liquid column-spraying device, and 6 be high-efficient atomizing spray equipment, and 7 be demister, and 8 be liquid column-spraying branch pipe,
9 be liquid column-spraying nozzle, and 10 be inlet flue duct, and 11 be flue gases duct, and 12 be stock tank, and 13 be slurry circulating pump, and 14 be reducer pipe,
15 be slurries pipeline, and 16 be atomizing spray main pipe, and 17 be high-efficient atomizing nozzle, and 18 be import flue gas inspection point, and 19 be outlet cigarette
Gas test point, 20 rooms in order to control.
In the present invention, the absorption tower tower body preferably uses the suction well known to those skilled in the art for flue gas desulfurization
The tower body of tower is received, it is not specifically limited to this by the present invention.In the present invention, absorption tower tower body lower part enters equipped with flue gas
Mouthful, thus pending flue gas enters inside absorbing tower body；Exhanst gas outlet is equipped at the top of the absorption tower tower body, after desulfurization
Thus neat stress is discharged inside absorbing tower body.
In the present invention, the inlet flue duct is communicated with the smoke inlet, for pending flue gas to be delivered to suction
It receives inside tower tower body；The flue gases duct is communicated with exhanst gas outlet, for the neat stress after desulfurization to be discharged in absorbing tower body
Portion.
In the present invention, serum recycle device, liquid column-spraying dress are set gradually inside the absorbing tower body from bottom to top
It sets, high-efficient atomizing spray equipment and demister；Wherein, the liquid column-spraying device is arranged above the smoke inlet.
In the present invention, the liquid column-spraying device includes several liquid column-spraying branch pipes, and liquid is formed for spraying slurries
Column；Each liquid column-spraying branch pipe bottom end is communicated with the serum recycle device, and top is equipped with liquid column-spraying nozzle.In this hair
In bright, several described liquid column-spraying branch pipes one or more horizontal beddings inside the absorbing tower body are uniformly distributed；
In this case, slurries are sprayed simultaneously by liquid column-spraying branch pipe described in several, can be formed in one or more horizontal beddings
Liquid column-spraying layer.In the preferred embodiment of the invention, several described liquid column-spraying branch pipes are inside the absorbing tower body
Two horizontal beddings are uniformly distributed, to form liquid column-spraying layer in two horizontal beddings, by controlling described two level courses
The spacing distance in face can obtain the double-deck intersection liquid column-spraying layer, to avoid forming the channel of flue gas in the tower body of absorption tower,
Turbulence level of the increase flue gas in jetted layers.In the present invention, the spacing distance of described two horizontal beddings is preferably 0.8m~2m,
More preferably 1.5m~2m.In the present invention, each horizontal bedding is preferably provided with 2/m2~4/m2Liquid column-spraying branch pipe.
In the present invention, the slurry flow of the liquid column-spraying device is big, and flow velocity is very fast, can form highdensity fluid column
Jetted layers；It is preferably 5m/s~14m/s to spray flow velocity, and single layer liquid-gas ratio is preferably 13L/m3~25L/m3, it is much larger than the prior art
In spray column single layer 5L/m3~8L/m3Liquid-gas ratio.
In the present invention, the injection direction of the liquid column-spraying nozzle is that vertical above-mentioned horizontal bedding is upward；The present invention adopts
Liquid column-spraying nozzle is according to flue gas operating mode type selecting, using unified constant aperture；It is described in the preferred embodiment of the invention
The pictorial diagram of liquid column-spraying nozzle is shown in Figure 2.During desulfurization operation, according to project operation load, exhaust gas volumn, SO2Into
Mouth concentration, SO2Exit concentration etc. controls slurries injection flow, and then controls jetting height.In the present invention, the liquid column-spraying
The aperture of nozzle is preferably 15mm~45mm, more preferably 25mm~45m；Flow and jetting height according to slurries operating pressure and
Fixed, the slurries operating pressure is preferably 0.2kg~1.6kg, and jetting height is preferably 0.8m~6m, and more preferably 0.8m~
5m。
In the present invention, the liquid column-spraying device is arranged above the smoke inlet, and pending flue gas is from described
Smoke inlet enters, while liquid column-spraying device makes slurries fluid column spray upwards, and flue gas can be had centainly by spraying upward slurries
Ejector action, reduce tower internal drop, while fluid column rise to highest point can nature scatter, decline under the effect of gravity；Entirely
Slurries have desulfurization twice in the process：It is once that slurries injection direction contacts absorption SO with flue gas in the same direction2, it is that slurries reach for the second time
Highest point diverging is fallen, and is inversely contacted with flue gas and is absorbed SO2, improve slurries utilization rate；Also, second desulfuration efficiency is higher than the
Once desulfurization.In addition, liquid column-spraying during slurries spray and decline upwards, mutually collides between drop, can be formed a large amount of
New drop, while also drop is fused etc., can constantly generate new gas-liquid contact face, improve gas-liquid mass transfer efficiency.
In the present invention, the serum recycle device includes stock tank, reducer pipe and slurries pipeline；Wherein, the stock tank is set
It sets in absorption tower tower body bottom, for recycling slurries；The reducer pipe is communicated with each liquid column-spraying branch pipe, is used for
Slurries are delivered to the liquid column-spraying branch pipe；The slurries pipeline is connected to the slurry circulating pump and reducer pipe, for conveying
Slurries.
In the present invention, slurry circulating pump is equipped in the stock tank, for providing conveying and injection power for slurries.At this
In invention, the slurry circulating pump is preferably speed governing type slurries pump, to during desulfurization operation, be born according to project operation
Lotus, exhaust gas volumn, SO2Inlet concentration, SO2Exit concentration etc. controls slurries injection flow, and then controls jetting height.
In the present invention, the diameter of the reducer pipe preferably reduces along slurries flow direction, to make slurries in reducer pipe
Flow constantly reduce with slurries flow direction, ensure slurry flow rate homogeneity in pipe, it is having the same dynamic in unit slurries
Can, ensure that slurries are injected in a height in tower, avoids liquid column-spraying height in tower irregular (if keeping main pipe caliber not
Become, main pipe end slurries minimum of kinetic energy, on absorption tower, jetting height can be continuously decreased with main pipe slurry direction), influence desulfurization effect
Fruit.
In the present invention, the high-efficient atomizing spray equipment include atomizing spray main pipe, several high-efficient atomizing nozzles and
Slurries spray pump.In the present invention, several described high-efficient atomizing nozzles are arranged around the atomizing spray main pipe；The mist
Change spray main pipe for conveying slurries, and forms the atomization spray of specific region by controlling distribution of the main pipe in the tower body of absorption tower
Drenching layer；In the preferred embodiment of the invention, the atomizing spray main pipe two layers of horizontal distribution in the tower body of absorption tower.In this hair
In bright, the slurries spray pump is communicated with the atomizing spray main pipe, for providing conveying and injection power for slurries.
In the present invention, the liquid column-spraying device is arranged in the underface of the high-efficient atomizing spray equipment.The present invention
By controlling the spacing distance of the two, the liquid column-spraying layer that the liquid column-spraying device is formed is made to be filled with high-efficient atomizing spray
It sets the atomizing spray layer to be formed and realizes that synergistic effect, the schematic diagram are shown in Figure 3.Atomized drop in atomizing spray layer passes through
Liquid film theoretical absorption SO2Afterwards, into liquid column-spraying layer；The slurries of atomizing spray can increase the turbulence level of liquid column-spraying layer, and
Drop that the drop that top is fallen rises with lower part, fluid column are blended, are collided, and generate more fresh drops；Meanwhile working as fluid column
When the slurries of injection reach maximum height, it is in interim stationary state, atomized drop has certain kinetic energy at this time, hits
Topmost fluid column, drop etc. can generate more drops.According to liquid film renewal theory, drop absorption SO2Surface can be because
For the collision of top drop, fresh absorbing film is formed, and then good SO can be showed again2Assimilation effect improves the area
The liquid film contacting efficiency in domain.In the present invention, the spacing distance of the liquid column-spraying device and the high-efficient atomizing spray equipment
Preferably 3m~7m, more preferably 5m~7m.The present invention controls atomizing spray and fluid column by adjusting the height of liquid column-spraying layer
The collision effect of drop between injection.
In the present invention, the high-efficient atomizing nozzle is preferably atomized solid-cone nozzle or atomization hollow cone nozzle, more excellent
It is selected as atomization solid-cone nozzle.The present invention has good atomizing effect using above-mentioned high-efficient atomizing nozzle；According to boundary-layer theory,
Same liquid-gas ratio has better gas-liquid mass transfer effect compared with the slurries of other forms spray.Currently, country SO2It is super
The standard of low emission is 35mg/Nm3, only rely on liquid column-spraying and be difficult to reach desulfurization effect；If only relying on atomizing spray, because
It is excessively high for slurry spraying back pressure, it is higher to the pressure head and lift demand of circulating pump, cause spray energy consumption higher.The present invention uses liquid
Column sprays and slurry spraying sprays coordinated desulfurization, utilizes liquid column-spraying high gas-liquid ratio, low energy consumption, by most SO2Removing；But
It is that liquid column-spraying is difficult to ensure desulfuration efficiency or ensures that the energy consumption of desulfuration efficiency is higher at this time, can then utilizes efficient mist at this time
Change spray by the SO in flue gas2It is removed to discharge standard 35mg/Nm3Below.
In the present invention, the demister is preferably demister, for removing the saturation drop in flue gas.In the present invention
In, the high-efficient atomizing spray equipment is arranged in the underface of the demister；The high-efficient atomizing spray equipment with it is described
The spacing distance of demister is preferably 1.5m~3m, more preferably 1.8m~2.4m.
In the present invention, the device of the flue gas desulfurization preferably further includes import flue gas inspection point, exiting flue gas test point
And control room.In the present invention, the import flue gas inspection point is arranged in the inlet flue duct；The exiting flue gas test point is set
It sets in the flue gases duct；The control room distribution is connected with the import flue gas inspection point and exiting flue gas test point.
In the present invention, it is known to be all made of those skilled in the art for the import flue gas inspection point and exiting flue gas test point
CEMS measuring points, for detecting flue-gas temperature, SO2The data such as concentration, pressure；Above-mentioned data can be transmitted to control room, in real time
Monitor the SO in flue gas2Concentration levels, and automatic control mode can be used and turned by adjusting slurry circulating pump and slurries spray pump
Speed exports pollutant concentration concrete numerical value to control.In addition, the SO in flue gas2Concentration is mainly related with power plant coal quality, institute of power plant
Coal quality is all more stable within the scope of general 1-5 days of the coal of burning；The staff of control room can be observed by man-machine interface
To the concentration of gas inlet and outlet, input liquid column-spraying or atomizing spray or liquid column-spraying and atomization are selected according to operating condition
It sprays while putting into；And the input of liquid column-spraying can be achieved speed governing operation and adjust serum recycle amount, realize energy saving purpose.
The device of flue gas desulfurization provided by the invention uses specific structure and connection relation, can realize liquid column-spraying and height
The coordinated desulfurization effect for imitating atomizing spray has the advantages that desulfuration efficiency is high, desulfurization effect is good and energy-saving consumption-reducing, and occupies sky
Between it is smaller, be suitble to the flue gas desulfurization of high density pollution object and big flow.According to field engineering experience, flue gas provided by the invention is de-
The device of sulphur can reduce by 15%~35% energy consumption under exclusive use spray scrubber same efficiency；Relative to individually making
10%~15% desulfuration efficiency can be improved with the injection of fluid column formula.
The present invention also provides a kind of methods of flue gas desulfurization, include the following steps：
A) device described in above-mentioned technical proposal is used, pending flue gas is subjected to liquid column-spraying desulfurization, turbulent flow successively
Drop contact desulfurization and high-efficient atomizing spray desulfurization, then remove the drop in flue gas, obtain neat stress.
In the present invention, the pending flue gas is preferably thermoelectricity well known to those skilled in the art, coking, chemical industry etc.
Industry discharge contains SO2Flue gas.The method of flue gas desulfurization provided by the invention can handle high density pollution object (SO2Concentration
Reach 5000mg/Nm3) and the flue gas of big flow (exhaust gas volumn reaches 2000000Nm3/ h or more), the present invention does not have this special limit
System.
In the present invention, the liquid column-spraying desulfurization is carried out by the liquid column-spraying layer that the liquid column-spraying device is formed,
Specifically include desulfurization twice：It is once that slurries injection direction contacts absorption SO with flue gas in the same direction2, it is that slurries reach highest for the second time
Place's diverging is fallen, and is inversely contacted with flue gas and is absorbed SO2；In addition, liquid column-spraying is during slurries spray and decline upwards, drop
Between mutually collide, a large amount of new drops can be formed, while also drop is fused etc., can constantly generate new gas-liquid contact
Gas-liquid mass transfer efficiency is improved in face.In the present invention, the injection flow velocity of the liquid column-spraying desulfurization is preferably 5m/s~14m/s；Institute
The liquid-column height for stating liquid column-spraying desulfurization is preferably 0.8m~6m, more preferably 0.8m~5m；The list of the liquid column-spraying desulfurization
Layer liquid-gas ratio is preferably 13L/m3~25L/m3。
In the present invention, the turbulent drop contact desulfurization is formed by the liquid column-spraying device liquid column-spraying layer and
The synergistic effect realization for the atomizing spray layer that the high-efficient atomizing spray equipment is formed, specially：Atomization in atomizing spray layer
Drop passes through liquid film theoretical absorption SO2Afterwards, into liquid column-spraying layer；The slurries of atomizing spray can increase the turbulent flow of liquid column-spraying layer
Degree, and drop, fluid column that the drop fallen of top rises with lower part are blended, collided, the more fresh drops of generation；Together
When, when the slurries of liquid column-spraying reach maximum height, it is in interim stationary state, atomized drop has centainly at this time
Kinetic energy, more drops can be generated by hitting topmost fluid column, drop etc..According to liquid film renewal theory, drop absorption SO2's
Surface can form fresh absorbing film, and then can show good SO again because of the collision of top drop2Assimilation effect,
Improve the liquid film contacting efficiency in the region.
In the present invention, the atomizing spray that the high-efficient atomizing spray desulfurization is formed by the high-efficient atomizing spray equipment
Layer carries out.
In the present invention, the drop in the removing flue gas is realized by the demister.
The method of flue gas desulfurization provided by the invention is cooperateed with using slurries injection with atomizing spray de- in same absorption tower
The mode of sulphur, first, the slurries of lower part injection carry out contact absorption in uphill process with flue gas, and absorption efficiency is relatively low at this time；
The SO in droplet, with flue gas can be formed when the slurries of injection reach top because gravity scatter2Into promoting the circulation of qi
Liquid mass transfer, absorbing and removing SO2, removal efficiency is higher；Then, under liquid column-spraying layer and atomizing spray layer synergistic effect, atomization
The slurries of spray can increase the turbulence level of liquid column-spraying layer, and the drop fallen of top rise with lower part drop, fluid column phase
Fusion, collision generate more fresh drops；Meanwhile when the slurries of liquid column-spraying reach maximum height, in interim
Stationary state, for atomized drop with certain kinetic energy, more drops can be generated by hitting topmost fluid column, drop etc. at this time,
To carry out turbulent drop contact desulfurization to flue gas；Finally, unabsorbed SO2Continue to rise, be starched with the atomizing spray on upper layer
Liquid contacts, and the mass transfer between gas-liquid is carried out, by the SO in flue gas2Thoroughly removing, reaches minimum discharge requirement, greatly improves SO2
Removal efficiency.In addition, the slurry circulating pump uses speed regulating control, it can be according to exhaust gas volumn, SO2Concentration etc. changes slurries and follows
Circular rector gives full play to liquid column-spraying SO2Absorption efficiency；And slurry circulating pump has higher power in desulfurization island, therefore
Desulfurization island energy consumption can be reduced by carrying out the speed regulating control of slurry circulating pump, achieve the effect that energy-saving and emission-reduction.
The present invention provides a kind of devices of flue gas desulfurization, including：Absorption tower tower body；Absorption tower tower body lower part is equipped with
Smoke inlet, top are equipped with exhanst gas outlet；Be successively set on from bottom to top serum recycle device inside the absorbing tower body,
Liquid column-spraying device, high-efficient atomizing spray equipment and demister；The liquid column-spraying device is arranged on the smoke inlet
Side；The liquid column-spraying device includes several liquid column-spraying branch pipes；Several described liquid column-spraying branch pipes are along the absorption tower
One or more horizontal beddings are uniformly distributed inside tower body；Each liquid column-spraying branch pipe bottom end and the serum recycle device
It communicates, top is equipped with liquid column-spraying nozzle；The inlet flue duct communicated with the smoke inlet；The cigarette communicated with the exhanst gas outlet
Gas flue.Compared with prior art, the device of flue gas desulfurization provided by the invention uses specific structure and connection relation, Neng Goushi
The coordinated desulfurization effect of existing liquid column-spraying and high-efficient atomizing spray, desulfurization effect high with desulfuration efficiency be good and energy-saving consumption-reducing
Advantage, and occupied space is smaller, is suitble to the flue gas desulfurization of high density pollution object and big flow.
In addition, device provided by the invention can monitor each side's face data of flue gas in real time, and according to exhaust gas volumn, SO2It is dense
The data such as degree carry out speed regulating control to slurry circulating pump and slurries spray pump and reach energy-saving and emission-reduction to reduce desulfurization island energy consumption
Effect.
In order to further illustrate the present invention, it is described in detail below by following embodiment.Following embodiment of the present invention
The structural schematic diagram of the device of flue gas desulfurization used is shown in Figure 1；Wherein, wherein 1 is absorption tower tower body, and 2 enter for flue gas
Mouthful, 3 be exhanst gas outlet, and 4 be serum recycle device, and 5 be liquid column-spraying device, and 6 be high-efficient atomizing spray equipment, and 7 fill for demisting
It sets, 8 be liquid column-spraying branch pipe, and 9 be liquid column-spraying nozzle, and 10 be inlet flue duct, and 11 be flue gases duct, and 12 be stock tank, and 13 be slurry
Liquid circulating pump, 14 be reducer pipe, and 15 be slurries pipeline, and 16 be atomizing spray main pipe, and 17 be high-efficient atomizing nozzle, and 18 be import cigarette
Gas test point, 19 be exiting flue gas test point, 20 rooms in order to control.
Embodiment 1
It is 350000Nm that the device of above-mentioned flue gas desulfurization, which is applied in exhaust gas volumn,3The demonstration project of/h, engineering SO2Concentration
For 5000mg/Nm3, flue-gas temperature is 125 DEG C.
Absorption tower tower body is designed as tower height 29m, and diameter 8m, the high 7m of stock tank, smoke inlet is at 8.5m；Several described liquid
Column sprays branch pipe and is uniformly distributed along two horizontal beddings inside the absorbing tower body, forms two layers of liquid column-spraying layer, first layer
It is arranged in 9m, second layer arranged crosswise is in 10.5m；Two layers of atomizing spray main pipe is set, two layers of atomizing spray layer, first layer are formed
It is arranged in 17.5m, the second layer is arranged in 19.5m.The all atomization solid-cone nozzles of high-efficient atomizing nozzle, two layers of arrangement,
Totally 100；The liquid column-spraying nozzle arranged crosswise, single layer arrange 96.
Two flows of setting are 2000m3The slurries spray pump of/h, power are respectively 160KW and 185KW；Two streams of setting
Amount is 2000m3The frequency conversion type slurry circulating pump of/h, power are respectively 160KW and 185KW.
According to the engineering specifications in embodiment 1, desulfuration efficiency, pressure drop and the energy consumption descended at full capacity under different condition are investigated.
The case where investigation, includes respectively：(1) liquid column-spraying desulfurization is used only under full-load conditions；(2) it is used only under completely negative loading condiction
High-efficient atomizing sprays desulfurization；(3) under full-load conditions desulfurization is sprayed using single layer liquid column-spraying and single layer high-efficient atomizing；(4) full
Two layers of liquid column-spraying and two layers of atomizing spray coordinated desulfurization are used under loading condiction.Engine results ginseng is shown in Table 1.
1 four pumps of table open to the maximum desulfurization effect data when power
As shown in Table 1, liquid column-spraying desulfuration efficiency is slightly above high-efficient atomizing spray desulfurization, and energy consumption is relatively low；Use single layer
Liquid column-spraying and single layer high-efficient atomizing spray, desulfuration efficiency is higher than exclusive use liquid column-spraying and high-efficient atomizing spray is used alone
Desulfuration efficiency；Higher using two layers of liquid column-spraying and two layers of atomizing spray coordinated desulfurization efficiency, desulfuration efficiency can reach
99.3%, SO2Concentration of emission be 35mg/Nm3。
Embodiment 2
According to the basic condition in embodiment 1, two layers of atomizing spray layer is changed, first layer is arranged in 16.5m, second layer cloth
It sets in 18.5m；Meanwhile theory, when speed governing circulation slurry pump standard-sized sheet, the height of upper layer liquid column-spraying can reach the first floor
Atomizing spray layer height.
According to the engineering specifications in embodiment 2, the desulfurization under different height difference between liquid column-spraying and atomizing spray is investigated
Efficiency, pressure drop and energy consumption.The case where investigation, includes respectively：(A) (upper layer fluid column jetting height can reach four circulating pump standard-sized sheets
First layer atomizing spray layer)；(B) frequency conversion type slurry circulating pump is controlled, it is 7000m to make total serum recycle amount3(upper layer fluid column sprays/h
Penetrate the height distance first layer atomizing spray layer 1m that height can reach)；(C) frequency conversion type slurry circulating pump is controlled, total slurries are made
Internal circulating load is 6500m3/ h (the height distance first layer atomizing spray layer 1.5m that upper layer fluid column jetting height can reach)；(D)
Frequency conversion type slurry circulating pump is controlled, it is 6000m to make total serum recycle amount3/ h (the height that upper layer fluid column jetting height can reach
Apart from first layer atomizing spray layer 2m).Engine results ginseng is shown in Table 2.
Table 2 controls desulfurization effect data when frequency conversion type serum recycle pump power
As shown in Table 2, the energy consumption highest of A situations, but desulfuration efficiency is minimum, this is because the liquid column-spraying height on upper layer
The height of first layer high-efficient atomizing spray is reached so that high-efficient atomizing spray is difficult to show atomizing effect；Fluid column sprays in the case of B
The height distance first layer high-efficient atomizing spray that penetrating can reach has the interval of 1m, and desulfurization effect highest, this illustrates at this for most
Good two layers of slurries mix distance；Desulfuration efficiency in the case of C and D continuously decreases, and respectively 94.2% and 92.1%, illustrate this
The height distance first layer high-efficient atomizing spray that liquid column-spraying can reach under part has the interval of 1.5m and 2m, and desulfurization effect is
Decline.In conclusion when liquid column-spraying layer sprays maximum height apart from minimum atomizing spray layer 1.0m, best desulfurization can be reached
Effect.
Embodiment 3
The device of above-mentioned flue gas desulfurization is applied to certain project 660MW generator set desulfurizations island, treatment quantity is
2120248Nm3/ h, desulfurization island inlet flue gas SO2A concentration of 4400mg/Nm3。
Absorption tower tower body diameter 16.8m, the high 13.3m of stock tank；Several described liquid column-spraying branch pipes are along the absorbing tower
Internal two, portion horizontal bedding is uniformly distributed, and the spacing distance of described two horizontal beddings is 1.5m, forms two layers of liquid column-spraying
Layer is the liquid column-spraying nozzle of 40mm per 235 apertures of layer arrangement；Two~tri- layers of atomizing spray main pipe are set, mist is integrally formed
Change spraying layer, the difference in height with liquid column-spraying layer is 6.5m.The high-efficient atomizing nozzle is using SIC solid-cones nozzle and hollow
Nozzle is bored, according to generally conventional arrangement.
The slurry circulating pump A/B uses speed regulating control, flow 12000m3/h；The stream of corresponding slurries spray pump
Amount is identical as the flow of slurry circulating pump separate unit circulating pump.
The demister is demister, apart from atomizing spray layer 2m high.
Through project quality inspection under unit at full capacity operating mode, the device of flue gas desulfurization provided by the invention can realize SO2It is super
Low emission (SO2≤35mg/Nm3)；Meanwhile, it is capable to reduce desulfurization island power consumption 15%~30% or so.
The above description of the disclosed embodiments, enables those skilled in the art to implement or use the present invention.It is right
A variety of modifications of these embodiments will be apparent to those skilled in the art, and as defined herein one
As principle can realize in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention will
It will not be intended to be limited to the embodiments shown herein, and be to fit to consistent with the principles and novel features disclosed herein
Widest range.
Claims (10)
1. a kind of device of flue gas desulfurization, including：
Absorption tower tower body；Absorption tower tower body lower part is equipped with smoke inlet, and top is equipped with exhanst gas outlet；
Serum recycle device, liquid column-spraying device, the high-efficient atomizing being successively set on from bottom to top inside the absorbing tower body
Spray equipment and demister；The liquid column-spraying device is arranged above the smoke inlet；The liquid column-spraying device packet
Include several liquid column-spraying branch pipes；Several described liquid column-spraying branch pipes are one or more horizontal inside the absorbing tower body
Level is uniformly distributed；Each liquid column-spraying branch pipe bottom end is communicated with the serum recycle device, and top is equipped with liquid column-spraying
Nozzle；
The inlet flue duct communicated with the smoke inlet；
The flue gases duct communicated with the exhanst gas outlet.
2. the apparatus according to claim 1, which is characterized in that the serum recycle device includes：
Stock tank in absorption tower tower body bottom is set；Slurry circulating pump is equipped in the stock tank；
The reducer pipe communicated with each liquid column-spraying branch pipe；The diameter of the reducer pipe reduces along slurries flow direction；
It is connected to the slurries pipeline of the slurry circulating pump and reducer pipe.
3. the apparatus according to claim 1, which is characterized in that several described liquid column-spraying branch pipes are along the absorbing tower
Internal two, portion horizontal bedding is uniformly distributed；The spacing distance of described two horizontal beddings is 0.8m~2m；Each horizontal bedding
2/m is set2~4/m2Liquid column-spraying branch pipe.
4. the apparatus according to claim 1, which is characterized in that the high-efficient atomizing spray equipment includes：
Atomizing spray main pipe；
Several high-efficient atomizing nozzles being arranged around the atomizing spray main pipe；
The slurries spray pump communicated with the atomizing spray main pipe.
5. device according to claim 4, which is characterized in that the high-efficient atomizing nozzle is atomization solid-cone nozzle or mist
Change hollow cone nozzle.
6. the apparatus according to claim 1, which is characterized in that the liquid column-spraying device setting is sprayed in the high-efficient atomizing
The underface of shower device；The spacing distance of the liquid column-spraying device and the high-efficient atomizing spray equipment is 3m~7m.
7. the apparatus according to claim 1, which is characterized in that the high-efficient atomizing spray equipment setting is filled in the demisting
The underface set；The spacing distance of the high-efficient atomizing spray equipment and the demister is 1.5m~3m.
8. according to claim 1~7 any one of them device, which is characterized in that further include：
Import flue gas inspection point in the inlet flue duct is set；
Exiting flue gas test point in the flue gases duct is set；
The control room being connected respectively with the import flue gas inspection point and exiting flue gas test point.
9. a kind of method of flue gas desulfurization, includes the following steps：
A) claim 1~7 any one of them device is used, pending flue gas is carried out to liquid column-spraying desulfurization, disorderly successively
Flow liquid drips contact desulfuriation and high-efficient atomizing sprays desulfurization, then removes the drop in flue gas, obtains neat stress.
10. according to the method described in claim 9, it is characterized in that, the injection flow velocity of liquid column-spraying desulfurization described in step a)
For 5m/s~14m/s, liquid-column height is 0.8m~6m, and single layer liquid-gas ratio is 13L/m3~25L/m3。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111298632A (en) * | 2020-03-03 | 2020-06-19 | 福建龙净环保股份有限公司 | Absorption tower for wet desulphurization and static pressure testing device thereof |
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