CN208194091U - A kind of wet desulphurization spray column - Google Patents
A kind of wet desulphurization spray column Download PDFInfo
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- CN208194091U CN208194091U CN201820429818.9U CN201820429818U CN208194091U CN 208194091 U CN208194091 U CN 208194091U CN 201820429818 U CN201820429818 U CN 201820429818U CN 208194091 U CN208194091 U CN 208194091U
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Abstract
The utility model discloses a kind of wet desulphurization spray column, including tower body, demister, moisturizing spraying layer, remove fog collector, tank type liquid distributor and concentrated base slot, wherein gas inlet is arranged in the lower end of tower body, and exhanst gas outlet is arranged in upper end；Moisturizing spraying layer is set to the top of tower body, connect with clear water source；Demister is set to the lower section of moisturizing spraying layer；Except fog collector includes the diversion cofferdam for closing rotary table and lower layer for emptying heart round estrade, middle layer on upper layer, the lower end that heart round estrade is set to demister is emptied, and the maximum gauge for emptying heart round estrade is equal with the internal diameter of tower body；The upper end of closing rotary table, which extends to, to be emptied in heart round estrade, and diversion cofferdam is funnel structure, and the lower end for closing rotary table extends to inside funnel structure；The tank type liquid distributor is located at the lower end except fog collector.
Description
Technical field
The utility model is specifically related to a kind of wet desulphurization spray column.
Background technique
Wet desulphurization is that spray column is common gas-liquid reaction apparatus, and sodium hydroxide lye is pumped to tower top by recirculated water
Spraying layer mix with except fog after, form the droplet whereabouts of dispersion, at the same flue gas adverse current and on, gas-liquid comes into full contact with, right
Flue gas is washed, and the sulfur dioxide in flue gas is washed removal.
Existing wet desulphurization is usually that lye spraying layer is arranged in desulfurizing tower, the lye of spray and flue gas reverse flow
Dynamic, lye is reacted with the sulfur dioxide in flue gas, removes sulfur dioxide.Since a large amount of liquid can be carried during flow of flue gas
Drop, if the direct outlet of flue gas after wet desulphurization, can affect to ambient enviroment.So can be de- in wet process
Demister is arranged in the outlet port of sulphur tower, due to not only containing moisture in the mist that carries in flue gas, also dissolved with sulfuric acid, sulfate,
Sulfur dioxide etc., corrosivity with higher cause to seriously affect to the service life of demister.
In addition, if single layer lye spraying layer is arranged in wet desulfuration tower, smoke desulfurization efficiency is relatively low, desulfurizing tower outlet
The content for locating sulfur dioxide in flue gas is not up to standard, and certain harm can be still caused to environment.
Utility model content
For above-mentioned the technical problems existing in the prior art, the purpose of the utility model is to provide a kind of wet desulphurization sprays
Drench tower.
In order to solve problem above, the technical solution of the utility model are as follows:
A kind of wet desulphurization spray column, including tower body, demister, moisturizing spraying layer, except fog collector, tank type liquid point
Cloth device and concentrated base slot, wherein
Gas inlet is arranged in the lower end of tower body, and exhanst gas outlet is arranged in upper end；
Moisturizing spraying layer is set to the top of tower body, connect with clear water source；
Demister is set to the lower section of moisturizing spraying layer；
Except fog collector includes the diversion cofferdam for closing rotary table and lower layer for emptying heart round estrade, middle layer on upper layer,
Open circles stage body is set to the lower end of demister, and the maximum gauge for emptying heart round estrade is equal with the internal diameter of tower body；Closed circular
The upper end of platform, which extends to, to be emptied in heart round estrade, and diversion cofferdam is funnel structure, and the lower end for closing rotary table extends to funnel structure
It is internal；
The tank type liquid distributor includes slot type mixer for liquid, lye jet pipe, lye tank (vat) and liquid distributor, slot type mixer for liquid
Bottom and side wall closing, top are provided with several groove bodies being set side by side from one end to the other end, and groove body bottom is got through, institute
The bottom for stating diversion cofferdam is connected to slot type mixer for liquid top center position；
The lye jet pipe is set to inside slot type mixer for liquid, and is connected to by pump with the concentrated base slot；Lye tank (vat) setting
In the lower section of slot type mixer for liquid, for receiving the liquid of slot type mixer for liquid overflow；Liquid distributor is connected to the bottom of lye tank (vat), by alkali
Liquid is evenly distributed on the cross section of tower body.
Demister can carry out demisting to the flue gas after desulfurization, sprayed water, can will be removed to demister by moisturizing spraying layer
Day with fog is cleaned, and the concentration of demister surface acid and salt is reduced, and is mitigated the corrosion to demister, is effectively increased demister
Service life.
The fog of demister removing and the inner wall for emptying heart round estrade to the ejected wash water edge of demister flow downward, and in
The weakly acidic water in the part is led under the guide functions three times of the diversion cofferdam of the secondary water conservancy diversion and lower layer of the closing rotary table of layer
It flow in the groove body at the middle part of slot type mixer for liquid, this part water enters the inside of slot type mixer for liquid by groove body, with lye jet pipe
The lye of penetrating mixes, and on the one hand removes acidic materials, and moisture is on the other hand supplemented into lye, can save lye spray
The water consumption of leaching.Lye in slot type mixer for liquid, into lye tank (vat), and passes through liquid distributor by the groove body overflow of its top two sides
Lye is evenly distributed on the cross section of tower body, desulfurization is carried out to flue gas.
Preferably, the demister is ripple packing demister.
Preferably, pH meter is provided in the liquid distributor.
Lye in lye jet pipe can be increased if pH is less than normal by the alkalinity that pH meter detects the lye in liquid distributor
Flow can suitably reduce the flow of the lye of lye jet pipe, in the premise for reaching preferable desulfuration efficiency if pH is bigger than normal
Under, use less lye.
Preferably, several through-holes are provided on the lye jet pipe.
The aperture of through-hole is required less herein, through-hole aperture can be larger, such as can achieve 2-5mm, even more greatly, produces
Raw resistance is smaller, since the location of lye jet pipe is higher, when the resistance of generation is smaller, can be effectively reduced to pump
Lift demand (relative to drive nozzle is used) sprays the conveying of high-concentration alkali liquor and is easier to realize.
Preferably, the liquid distributor includes communicating pipe, main distributed pipeline and several branch distributed pipelines, the upper end of communicating pipe
It is connected to the lye tank (vat), lower end is connected to the main distributed pipeline, several branch distributed pipelines are perpendicularly fixed at main distribution
The lower section of pipeline, and be connected to main distributed pipeline, the lower end of each distributed pipeline is provided with several spray apertures.
It is further preferred that main distributed pipeline and the link position of communicating pipe are located at the middle part of main distributed pipeline, branch distribution
The link position of pipeline and main distributed pipeline is located at the middle part of branch distributed pipeline.
The stability of liquid distributor can be improved.
Preferably, packing layer is provided with below the liquid distributor.
The denseer lye that liquid distributor sprays forms liquid film in packing layer, can effectively improve the contact surface with flue gas
Product, and then improve the desulfuration efficiency to flue gas.
It is further preferred that the filler in described filler layer is ripple packing.
Preferably, sig water spraying layer is provided with below described filler layer, sig water spraying layer passes through pump and tower body bottom
Portion's connection.The complete lye of the unreacted of tower body bottom can be sprayed again.
It is further preferred that the sig water spraying layer is provided with several drive nozzles.The setting of sig water spraying layer
Position is lower, and pump can be easy to for sig water to be pumped to the height.It, can be by the abundant mist of sig water when using drive nozzle
Change, improves the contact area of droplet and flue gas, and then improve the desulfuration efficiency to flue gas.
Preferably, the bottom of the tower body is provided with pH meter.
It can be used for measuring the pH value of bottom liquid, if aobvious alkalinity, may be reused, if being difficult to reach preferable again
Desulfurization effect, then by the partially liq outlet processing.
A kind of wet desulphurization method, includes the following steps:
1) flue gas, which is passed through in wet desulphurization spray column, carries out desulfurization, and the moisturizing spraying layer of wet desulphurization top of tower is to demister
Clear water is sprayed, demister is cleaned；
2) demister removing drop with demister is cleaned after water except fog collector guide functions under
It flow in the slot type mixer for liquid of tank type liquid distributor, is mixed with the lye of the higher concentration from lye jet pipe, reacted；
3) lye after the preliminarily diluted in slot type mixer for liquid passes through the groove body overflow of two sides at the top of slot type mixer for liquid to alkali
In liquid bath, and lye is evenly distributed on the cross section of tower body by liquid distributor, the packing layer of lower section is fallen in, in packing layer shape
At lye film, desulfurization is carried out to flue gas.
Preferably, above-mentioned sulfur method further includes the setting sig water spraying layer below packing layer, by the dilute of tower body bottom
Lye carries out the step of circulated sprinkling.
The utility model has the following beneficial effects:
Demister can carry out demisting to the flue gas after desulfurization, sprayed water, can will be removed to demister by moisturizing spraying layer
Day with fog is cleaned, and the concentration of demister surface acid and salt is reduced, and is mitigated the corrosion to demister, is effectively increased demister
Service life.
The fog of demister removing and the inner wall for emptying heart round estrade to the ejected wash water edge of demister flow downward, and in
The weakly acidic water in the part is led under the guide functions three times of the diversion cofferdam of the secondary water conservancy diversion and lower layer of the closing rotary table of layer
It flow in the groove body at the middle part of slot type mixer for liquid, this part water enters the inside of slot type mixer for liquid by groove body, with lye jet pipe
The lye of penetrating mixes, and on the one hand removes acidic materials, and moisture is on the other hand supplemented into lye, can save lye spray
The water consumption of leaching.Lye in slot type mixer for liquid, into lye tank (vat), and passes through liquid distributor by the groove body overflow of its top two sides
Lye is evenly distributed on the cross section of tower body, desulfurization is carried out to flue gas.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is the structural schematic diagram of the wet desulfuration tower of the utility model；
Fig. 2 is the structural schematic diagram of demisting water collecting groove；
Fig. 3 is the structural schematic diagram of tank type liquid distributor；
Fig. 4 is the structural schematic diagram of liquid distributor；
Fig. 5 is balanced line and operation lines；
Fig. 6 is Y pairsThe integrogram of mapping.
Wherein, 1, exhanst gas outlet, 2, moisturizing spraying layer, 3, demister, 4, remove fog collector, 5, tank type liquid distribution
Device, 6, packing layer, 7, drive nozzle, 8, first flowmeter, 9, concentrated base slot, 10, second flowmeter, 11, reactive tank, 12, flue,
13, pH meter, 14, emptying heart round estrade, 15, closing rotary table, 16, diversion cofferdam, 17, slot type mixer for liquid, 18, lye jet pipe, 19,
Communicating pipe, 20, main distributed pipeline, 21, branch distributed pipeline, 22, lye tank (vat).
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As shown in Figure 1, a kind of wet desulphurization spray column, including tower body, demister, moisturizing spraying layer, except fog collector,
Tank type liquid distributor and concentrated base slot 9, wherein gas inlet is arranged in the lower end of tower body, and gas inlet is connect with flue 12, upper end
Exhanst gas outlet 1 is set；Moisturizing spraying layer 2 is set to the top of tower body, connect with clear water source；Demister 3 is set to moisturizing spray
The lower section of layer 2.
As shown in Fig. 2, except fog collector 4 include upper layer empty heart round estrade 14, middle layer closing rotary table 15 and under
The diversion cofferdam 16 of layer empties heart round estrade 14 and is set to the lower end of demister 3, and empty the maximum gauge of heart round estrade 14 with
The internal diameter of tower body is equal；The upper end of closing rotary table 15, which extends to, to be emptied in heart round estrade 14, and diversion cofferdam 16 is funnel structure, envelope
The lower end for closing rotary table 15 extends to inside funnel structure；Except fog is collected along 14 inner wall of heart round estrade is emptied, along intermediate closed circular
The outer wall water conservancy diversion of platform 15 is flowed into tank type liquid distributor by diversion cofferdam 16.The top diameter for closing rotary table 15 is less than to fall
The base diameter of open circles stage body 14.The water flow that the inner wall water conservancy diversion of emptying heart round estrade 14 gets off can fall directly into closing round estrade
On 15 outer wall, it is more advantageous to the water conservancy diversion to water.
As a kind of specific embodiment, the top for closing rotary table 15 extends to the inside for emptying heart round estrade 14.
The bus and the angle of vertical direction for emptying heart round estrade 14 are 10-60 °, preferably 20-45 °, e.g., can for 20 °,
30 °, 40 ° and 45 ° etc..
The bus and the angle of vertical direction for closing rotary table 14 are 30-80 °, preferably 45-60 °, e.g., can for 45 °, 50 °,
55 ° and 60 ° etc..
The surrounding at the top of diversion cofferdam 16 is provided with vertical baffle, and the water flowed down can be effectively prevent to splash out.Diversion cofferdam
The bus of 16 funnel structure and the angle of vertical direction are 30-80 °, preferably 45-60 °, e.g., can for 45 °, 50 °, 55 ° and
60 ° etc..The lower end outlet of diversion cofferdam 16 is provided with diversion pipe.Diversion pipe with the slot type mixer for liquid 17 of lower section for connecting.
As shown in Figure 3 and Figure 4, the tank type liquid distributor includes slot type mixer for liquid 17, lye jet pipe 18, lye tank (vat) 22
And liquid distributor, the bottom and side wall closing of slot type mixer for liquid 17, top is provided with several from one end to the other end and sets side by side
The cross-sectional shape of the groove body set, groove body is rectangle or triangle, and preferably triangle, bottom is got through, the diversion cofferdam
16 bottom is connected to 17 top center position of slot type mixer for liquid；Lye jet pipe 18 is set to inside slot type mixer for liquid 17, and logical
Pump is crossed to be connected to the concentrated base slot 9；Lye tank (vat) 22 is set to the lower section of slot type mixer for liquid 17, overflows for receiving slot type mixer for liquid 17
The liquid of stream；Liquid distributor is connected to the bottom of lye tank (vat) 22, and lye is evenly distributed on the cross section of tower body.
Demister can carry out demisting to the flue gas after desulfurization, sprayed water, can will be removed to demister by moisturizing spraying layer
Day with fog is cleaned, and the concentration of demister surface acid and salt is reduced, and is mitigated the corrosion to demister, is effectively increased demister
Service life.
The fog of demister removing and the inner wall for emptying heart round estrade to the ejected wash water edge of demister flow downward, and in
The weakly acidic water in the part is led under the guide functions three times of the diversion cofferdam of the secondary water conservancy diversion and lower layer of the closing rotary table of layer
It flow in the groove body at the middle part of slot type mixer for liquid, this part water enters the inside of slot type mixer for liquid by groove body, with lye jet pipe
The lye of penetrating mixes, and on the one hand removes acidic materials, and moisture is on the other hand supplemented into lye, can save lye spray
The water consumption of leaching.Lye in slot type mixer for liquid, into lye tank (vat), and passes through liquid distributor by the groove body overflow of its top two sides
Lye is evenly distributed on the cross section of tower body, desulfurization is carried out to flue gas.
The demister is ripple packing demister.PH meter is provided in the liquid distributor.Liquid distributor is detected by pH meter
In the alkalinity of lye can increase the flow of lye in lye jet pipe if pH is less than normal, if pH is bigger than normal, can suitably subtract
The flow of the lye of small lye jet pipe uses less lye under the premise of reaching preferable desulfuration efficiency.
Several through-holes are provided on lye jet pipe.The aperture of through-hole is required less herein, through-hole aperture can be larger,
It such as can achieve 2-5mm, even more greatly, the resistance of generation is smaller, since the location of lye jet pipe is higher, when the resistance of generation
When power is smaller, the lift demand (relative to drive nozzle is used) to pump can be effectively reduced, spray the conveying of high-concentration alkali liquor
Leaching is easier to realize.
As shown in figure 4, the liquid distributor includes communicating pipe 19, main distributed pipeline 20 and several branch distributed pipelines 21, connect
The upper end of siphunculus 19 is connected to the lye tank (vat) 22, and lower end is connected to the main distributed pipeline 20, several branch distributed pipelines 21
It is perpendicularly fixed at the lower section of main distributed pipeline 20, and is connected to main distributed pipeline 20, the lower end of each distributed pipeline 21
It is provided with several spray apertures.Main distributed pipeline 20 is located at the middle part of main distributed pipeline 20 with the link position of communicating pipe 19,
The link position of branch distributed pipeline 21 and main distributed pipeline 20 is located at the middle part of branch distributed pipeline 21.The steady of liquid distributor can be improved
It is qualitative.
Packing layer 6 is provided with below liquid distributor.The denseer lye that liquid distributor sprays forms liquid in packing layer 6
Film can effectively improve the contact area with flue gas, and then improve the desulfuration efficiency to flue gas.Filler in packing layer 6 is wave
Line filler.The lower section of packing layer 6 is provided with sig water spraying layer, and sig water spraying layer is connected to by pump with tower body bottom.It can be with
The complete lye of the unreacted of tower body bottom is sprayed again.Sig water spraying layer is provided with several drive nozzles 7.It is dilute
The setting position of lye spraying layer is lower, and pump can be easy to for sig water to be pumped to the height.It, can when using drive nozzle 7
Sig water to be sufficiently atomized, the contact area of droplet and flue gas is improved, and then improve the desulfuration efficiency to flue gas.
The bottom of tower body is provided with pH meter.It can be used for measuring the pH value of bottom liquid, if aobvious alkalinity, can repeat to make
With if being difficult to reach preferable desulfurization effect again, by partially liq outlet processing.
A kind of wet desulphurization method, includes the following steps:
1) flue gas, which is passed through in wet desulphurization spray column, carries out desulfurization, and the moisturizing spraying layer of wet desulphurization top of tower is to demister
Clear water is sprayed, demister is cleaned；
2) demister removing drop with demister is cleaned after water except fog collector guide functions under
It flow in the slot type mixer for liquid of tank type liquid distributor, is mixed with the lye of the higher concentration from lye jet pipe, reacted；
3) lye after the preliminarily diluted in slot type mixer for liquid passes through the groove body overflow of two sides at the top of slot type mixer for liquid to alkali
In liquid bath, and lye is evenly distributed on the cross section of tower body by liquid distributor, the packing layer of lower section is fallen in, in packing layer shape
At lye film, desulfurization is carried out to flue gas.
4) sig water spraying layer is set below packing layer, the sig water of tower body bottom is subjected to circulated sprinkling.
Wet desulphurization Deethanizer design
1, design object
After the processing such as dry desulfurization, into the Gas Parameters of wet desulfuration tower and the outlet SO of wet desulphurization2Concentration
It is required that being shown in Table 1.
1 wet desulfuration tower inlet flue gas parameter of table
2, the influence factor of absorption efficiency
In packed tower, mass transport process between sodium hydroxide solution and sulfur dioxide in flue gas can with double-film theory come
It explains.
The essence of two film model be mass-transfer progress is reduced to by the air film and liquid film of gas-liquid interface two sides come into
Capable, the alternate absorption of liquid phase two (mass transfer) rate is determined by this molecular diffusion rate for being detained film.
Absorption liquid pH is to influence a principal element of desulfurization degree, according to following formulas
2NaOH+SO2→Na2SO3+H2O；
Na2SO3+SO2+H2O→2NaHSO3；
SO2H is dissociateed into absorbing liquid+And HSO3 -, with OH-Further reaction.
When resting on high pH, OH-Ion concentration is higher, and chemical reaction rate is very fast, and the enhancement factor of mass transfer in liquid phase is big
And resistance is small, entire mass transport process is controlled by gas phase drag and absorption rate is larger, is finally presented as SO2Overall mass transfer coefficient compared with
It is high；
When pH drops to 6 or so, [SO in absorbing liquid3 2-] and enhancement factor comparatively fast reduce, resistance to mass tranfer with the reduction of pH
It increases accordingly, makes SO2Mass tranfer coefficient declines rapidly, is intended to close using water as the air film of desulfurizing agent sweetening process, liquid-film resistance
Double films control absorption process；
3, desulfurization Deethanizer design
1) demisting layer designs
Project spray column uses ripple packing demisting, referring to ripple packing calculation method, designs superficial linear velocity in a column 0.6m/ in tower
S, identify project desulfurizing tower internal diameter 3.8m, and sprinkle density generally should be greater than 0.2m3/m2.h, 0.5m is taken3/m2When .h, amount of makeup water
5.67m3/h。
Demisting water collecting groove upper layer is that hollow round table, middle layer are closing rotary table, and lower layer is diversion cofferdam, except fog is along upper
Hollow round table inner wall is collected, along intermediate rotary table outer wall water conservancy diversion, through diversion cofferdam into inflow tank type liquid distributor.Except fog
It collects slot form and sees Fig. 2.
2) Desulfurization Calculation
Process with sodium hydroxide solution sulfur dioxide absorption is mainly the absorption process of fast chemical reaction, and pH is along tower height
There is change of gradient, high pH doctor solution region uses efficient corrugated filler, therefore directly in terms of the desulfuration efficiency of upper layer ripple packing
Calculate the height for determining packing layer.The general internal circulating load of desulfurizing tower lower layer spray section doctor solution is bigger, and pH is relatively low, has certain slow
SOLUTION PROPERTIES is rushed, the major function of the spray section is to prevent smoke temperature change from influencing absorption process in tower, completes part SO2- 3
Oxidation absorbs a part of sulfur dioxide in flue gas.
According to the equilibrium constant of water sulfur dioxide absorption, this technique is calculated to the removal effect of sulfur dioxide in flue gas.Water
The equilibrium constant of sulfur dioxide absorption is shown in Table 2.
The equilibrium constant of 2 water sulfur dioxide absorption of table
At 50 DEG C, pH=5,6, reaction process and ionization equilibrium are respectively as follows:
[H+]=[SO2·H2O]·Ks1/[HSO3 -]
[H+]=Ks1·[HSO3 --]/[SO3 2-]
At 50 DEG C, logKs1=853/T-4.74 (M)=- 2.0991
logKs2=621.9/T-9.278 (M)=- 7.3526
Calculate to obtain Ks1=7.9598 × 10-3M
Ks2=4.44 × 10-8M
Secondary ionization is very small, can ignore；
For first stage ionization [SO2·H2O]=([H+][HSO3 --])·1/Ks1
In pH=5, [SO2·H2O]=10-5·1/7.9598×10-3=1.256 × 10-8
In pH=6, [SO2·H2O]=10-5·1/7.9598×10-6=1.256 × 10-10
According to reaction equation
PSO2=[SO2·H2O]/Khs·PSO2
Calculate to obtain logKhs=1376.1/T-4.51=-0.2496
Khs=0.5628
In pH=5, PSO2=1.256 × 10-8/ 0.5628=2.2317 × 10-8atm
Project flue gas pressures are 1atm, then SO2Concentration conversion is 2.2317/22.4 × 64 × 10-8=6.376 × 10-8mg/
m3
In pH=6, PSO2=2.2317 × 10-10Atm, corresponding SO2Equilibrium concentration it is smaller
If corresponding SO when pH=42Equilibrium concentration be 6.376 × 10-6mg/m3, which is substantially better than environment
Numerical value in air quality standard.
It is above to calculate it can be seen that the equilibrium concentration of the sulfur dioxide in flue gas after wet desulphurization can reach nearly zero-emission
It puts.
Technical process bed stuffing height is calculated by absorption mass transfer rate equation and mass balance:
1, rate accounts formula: dN=KY(Y-Y*)dA
In formula: N-absorbent absorption rate kmol/h
A-contact area m2
Y-Y*--- mass transferring in gas phase motive force
KY--- mass transferring in gas phase overall coefficient
2, mass balance formula: dN=VdY
It is obtained in conjunction with above two formula: dN=VdY=KY(Y-Y*)dA
Therefore:
In same tower and under certain operation condition, K is takenYFor definite value, then integrate along whole contact surfaces:
Wherein:
In formula: H-bed stuffing height m
Ω-packed tower cross-sectional area m2
The effective specific surface m of α-filler2/m3
To obtain the height of packing layer:
It enablesThen: H=HOG·NOG；
H in formulaOGReferred to as mass transferring in gas phase cell height m；NOGReferred to as number of elements of gas phase mass transfer.
Mass transferring in gas phase cell height can be used directlyIt calculates, asking for number of mass transfer unit is more complex, can be used to lower section
Method calculates.
Graphical integration: to askMade in X-Y figure first balanced line and operation lines (operation lines
Slope is determined according to absorbent than dosage)；Then in Y1—Y2Y is gradually found out in range to the value of Y*；Later again with Y pairsMapping, finds out area under a curve, value is NOG(see Fig. 5 and Fig. 6).
Graphical method be relatively meet operating condition in engineering, and it is more acurrate checking computations packed absorber method.In view of this item
Mesh is that dangerous waste burns project, and sulfur dioxide concentration has apparent fluctuation, is also difficult to adapt to production status even if accurately calculating
Fluctuation and discharge outlet discharge standard the requirement of mandatory limit value, therefore as parameter evaluation method, person's character design alternative is simpler
Just chemical absorbing calculation method derived from logarithmic mean concentration difference method.
(2) logarithmic mean concentration difference method: when the equilibrium relation of absorption obeys Henry's law, i.e. balanced line is a straight line or connects
When nearly straight line, calculating be can simplify, using logarithmic mean concentration difference method.Calculation formula is as follows:
Mass balance formula: dN=Vd Y
By Henry's law: Y*=m X is therefore
Again by absorption rate equation: dN=KY(Y-Y*)dA
Comprehensive above formula obtains:
By upper integral, A is from 0-A in the process, and Y is from Y2—Y1:
Again in terms of Quan Talai absorbent mass balance:
N=V (Y1-Y2)
It is obtained by above two formula:
By this formula substitute into formula 1. in:
WhenWhen,It is little that the motive force that is averaged takes arithmetic average to influence accuracy in computation
When, then by following formula N=V (Y1-Y2)
In conjunction with 2.: V (Y1-Y2)=KYAΔYm
Again withIt substitutes into:
It can be seen from 5.2.3.2 calculated result within the scope of desulfurizing tower whole operation, lye sulfur dioxide absorption is put down
The concentration that weighs and the concentration difference in flue gas are very huge, and the environmental monitoring data of practical sulphur removal tower operation also has equifinality.?
It is exactly the corresponding concentration of balanced line for operation lines concentration, more like the abscissa line for tending to nearly zero.And lye absorbs two
The fast chemical reaction of sulfur oxide has been obviously promoted the transfer of solute liquid phase, essentially eliminates film mass transfer resistance, influences to absorb
The resistance to mass tranfer of journey focuses only on air film on one side, therefore the numerical value of mass transfer overall coefficient is closer to high-dissolvability gas such as ammonia, chlorine
Change the absorption numerical value of hydrogen.Therefore packed height calculating can simplify are as follows:
Yb--- enter SO in packing layer flue gas2Concentration
Ya--- leave SO in packing layer flue gas2Concentration
V/ Ω=0.6m/s K is taken in this calculatingYα=0.65s-1(absorbing mass tranfer coefficient estimation by ammonia)
SoSuch as export SO2Concentration is 10mg/m3, then packed height calculates
Value is 2.13m.
This project bed stuffing height takes 3m.
3) absorption tower spray height
Compared with typical, the design exhaust gas volumn is lower, because using ripple packing as absorption operation filler, therefore absorbs
Tower actual wind speed is obvious relatively low compared with desulfurization by lime gypsum method technique 3.5m/s.Engineering is using similar centrifugal pressure spray
The liquid-gas ratio of mouth spray column bottom doctor solution, sprinkle density can suitably lower as 1-2L.m-3.
General nozzle liquid-drop diameter is 1.5mm, and the liquid-drop diameter is smaller, and compared with raindrop, deformation is smaller, substantially spherically-shaped
Decline.The smoke contacts reaction time is generally 2-5s, and taking 5s to calculate spray section height is 3m.
This project spray tower height degree takes 3m.
4) groove height is reacted
2.2 ten thousand m of Project design air quantity3The superficial linear velocity in a column of gas in/h and tower, calculating project packed tower diameter are 3.8m.
For absorbing liquid at 3~5 minutes of tower bottom, it was 4 minutes that the residence time is taken in design, then according to fluid flow calculate the liquid measure of tower bottom is
29.33m3, can find out spatial altitude shared by bottom liquid is 2.59m, and approximation takes 3m.
5) desulfurizing tower total height
It is also laid with liquid distribution trough, tower top demister inside packed tower, while considering that gas-liquid imports and exports required space, skirt
The attached height such as seat height degree.
More than filler in packed column layer, certain spatial altitude is reserved, so that drop can be separated from air-flow, the tower
Upper liquid distributor installation space is about 1.5m, and tower top demister and clear space are every 2.5m.Doctor solution spray head space 0.5m.Wave
Line filler, spraying zone and each 3m height of doctor solution liquid storage area.
It is calculated according to above, determines that desulfurizing tower total height is 13.5m.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (10)
1. a kind of wet desulphurization spray column, it is characterised in that: including tower body, demister, moisturizing spraying layer, except fog collector,
Tank type liquid distributor and concentrated base slot, wherein
Gas inlet is arranged in the lower end of tower body, and exhanst gas outlet is arranged in upper end；
Moisturizing spraying layer is set to the top of tower body, connect with clear water source；
Demister is set to the lower section of moisturizing spraying layer；
Except fog collector includes the diversion cofferdam for closing rotary table and lower layer for emptying heart round estrade, middle layer on upper layer, the heart is emptied
Round estrade is set to the lower end of demister, and the maximum gauge for emptying heart round estrade is equal with the internal diameter of tower body；Close rotary table
Upper end, which extends to, to be emptied in heart round estrade, and diversion cofferdam is funnel structure, and the lower end for closing rotary table extends to inside funnel structure；
The tank type liquid distributor includes slot type mixer for liquid, lye jet pipe, lye tank (vat) and liquid distributor, the bottom of slot type mixer for liquid
It is closed with side wall, top is provided with several groove bodies being set side by side from one end to the other end, and groove body bottom is got through, described to lead
The bottom in stream cofferdam is connected to the middle position at the top of slot type mixer for liquid；
The lye jet pipe is set to inside slot type mixer for liquid, and is connected to by pump with the concentrated base slot；Lye tank (vat) is set to slot
The lower section of formula mixer for liquid, for receiving the liquid of slot type mixer for liquid overflow；Liquid distributor is connected to the bottom of lye tank (vat), and lye is equal
It is even to be distributed on the cross section of tower body.
2. wet desulphurization spray column according to claim 1, it is characterised in that: the demister is ripple packing demisting
Device.
3. wet desulphurization spray column according to claim 1, it is characterised in that: be provided with pH meter in the liquid distributor.
4. wet desulphurization spray column according to claim 1, it is characterised in that: be provided with several on the lye jet pipe
Through-hole.
5. wet desulphurization spray column according to claim 1, it is characterised in that: the liquid distributor includes communicating pipe, main point
Cloth pipeline and several branch distributed pipelines, the upper end of communicating pipe are connected to the lye tank (vat), and lower end and the main distributed pipeline connect
Logical, several branch distributed pipelines are perpendicularly fixed at the lower section of main distributed pipeline, and are connected to main distributed pipeline, and each point
The lower end of cloth pipeline is provided with several spray apertures.
6. wet desulphurization spray column according to claim 5, it is characterised in that: the connection position of main distributed pipeline and communicating pipe
Setting in the middle part of main distributed pipeline, the link position of branch distributed pipeline and main distributed pipeline is located at the middle part of branch distributed pipeline.
7. wet desulphurization spray column according to claim 1, it is characterised in that: be provided with filler below the liquid distributor
Layer.
8. wet desulphurization spray column according to claim 7, it is characterised in that: the filler in described filler layer is filled out for ripple
Material.
9. wet desulphurization spray column according to claim 7, it is characterised in that: be provided with diluted alkaline below described filler layer
Liquid spraying layer, sig water spraying layer are connected to by pump with tower body bottom.
10. wet desulphurization spray column according to claim 9, it is characterised in that: if the sig water spraying layer is provided with
Dry drive nozzle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820429818.9U CN208194091U (en) | 2018-03-28 | 2018-03-28 | A kind of wet desulphurization spray column |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108211749A (en) * | 2018-03-28 | 2018-06-29 | 李文 | A kind of wet desulphurization spray column and sulfur method |
| CN109351168A (en) * | 2018-12-26 | 2019-02-19 | 南京泰斯普化工工程技术有限公司 | A kind of flue gas desulfurization device |
-
2018
- 2018-03-28 CN CN201820429818.9U patent/CN208194091U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108211749A (en) * | 2018-03-28 | 2018-06-29 | 李文 | A kind of wet desulphurization spray column and sulfur method |
| CN108211749B (en) * | 2018-03-28 | 2023-12-08 | 李文 | Wet desulfurization spray tower and desulfurization method |
| CN109351168A (en) * | 2018-12-26 | 2019-02-19 | 南京泰斯普化工工程技术有限公司 | A kind of flue gas desulfurization device |
| CN109351168B (en) * | 2018-12-26 | 2024-05-14 | 南京泰斯普化工工程技术有限公司 | Flue gas desulfurization device |
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