CN106000066A - Absorbing tower with air introducing device - Google Patents
Absorbing tower with air introducing device Download PDFInfo
- Publication number
- CN106000066A CN106000066A CN201610516161.5A CN201610516161A CN106000066A CN 106000066 A CN106000066 A CN 106000066A CN 201610516161 A CN201610516161 A CN 201610516161A CN 106000066 A CN106000066 A CN 106000066A
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- Prior art keywords
- absorption tower
- air
- valve
- branch road
- spraying layer
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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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (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)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses an absorbing tower with an air introducing device. The absorbing tower with the air introducing device comprises an absorbing tower, spraying devices, a two-stage demister, a multi-stage stirring device and the air introducing device, wherein the spraying devices are positioned on the upper part in the absorbing tower; the two-stage demister is positioned between the spraying devices; the multi-stage stirring device is positioned at the bottom of the absorbing tower; the air introducing device is positioned outside the absorbing tower; air is introduced to the lower part of the absorbing tower through an oxidation fan. The absorbing tower has the beneficial effects of simple structure, low energy consumption, convenience in overhauling and capability of running stably for a long time; the air is blown into a pulp pond through the oxidation fan, so that calcium sulfite in the pulp pond of the absorbing tower is fully oxidized into calcium sulfate; process water is introduced into the oxidation fan through a spraying-cooling device, so that the temperature of the oxidation fan is lowered, and the solubility of oxygen in the pulp pond is increased; liquid drops carried in desulfurized flue gas are separated and collected in the two-stage demister at the outlet of the absorbing tower, and liquid drops in purified flue gas do not exceed 50mg/Nm<3>; deposition of solids in pulp in the absorbing tower is prevented.
Description
Technical field
The present invention relates to technical field of desulfurization, in particular to the absorption of a kind of band air introducing device
Tower.
Background technology
Desulfuration absorbing tower is to use physics and chemical method, removes device or the structure of sulfur dioxide in flue gas
Build thing.The main component of pulverized-coal fired boiler flue dust: silicon dioxide, aluminium sesquioxide, iron sesquioxide, oxygen
Change calcium, magnesium oxide, uncompleted burned carbon etc..Contained by thermal power plant desulfurization spray absorption tower flue gas after desulfurization
Flue dust, wherein contain the composition of part coal dust firing flue dust, in major part solid content is desulfuration absorbing tower
Slurry content.
Wet desulphurization is one of multiple sulfur method, and wet desulphurization is done with water in absorption and course of reaction and inhaled
Receiving agent carrier, part water participates in the physical and chemical processes such as absorption and oxidation, and absorb and oxidation etc. reacts big portion
Divide and complete in desulfuration absorbing tower.The mainstream technology of wet desulphurization is limestone～gypsum wet desulfurization, wet
Having 80～95% in method desulfuration absorbing tower is limestone～gypsum wet desulfuration absorbing tower.The ammonia process of desulfurization,
Sea water desulfuration, double alkali method desulfurizing, organic amine desulfurization etc. are the most all wet desulphurizations.But in wet desulphurization system
In system, along with the carrying out of reaction, the solids in the serosity of absorption tower is easily deposited on the bottom on absorption tower,
Have impact on the effect of desulfurization.
In multiple desulfuration absorbing tower, having a class wet desulphurization absorption tower is spray absorption tower.Fountain
Absorption tower main working process utilizes slurry circulating pump to be transported to absorption serosity be made up of multiple nozzles
Spraying layer, absorbs and forms intensive atomization slurry spray district after serosity is sprayed by the atomizer of spraying layer,
Serosity is at atomizing spray district and smoke contacts, the SO in contact process absorbs flue gas2Etc. harmful gas,
Completing flue gas desulfurization, serosity descends slowly and lightly in the stock tank bottom absorption tower inside absorption tower.Inhale at spray
During receipts, the most of dust washing carried in flue gas is absorbed by the serosity that absorbs of atomization, is washed suction
The flue dust major part received is not involved in the chemical reaction of absorbent.Flue dust absorbance by adsorption tower smoke flow velocity,
The factors such as sprinkle density, flue-gas temperature affects.Absorption tower is some tiny slurry during spray
Flue gas after liquid drop and solid particulate matter times desulfurization carries, containing the sulphuric acid dissolved, sulfur in fine droplet
Hydrochlorate, sulfur dioxide etc., contain the solid particles etc. such as desulfurization sulfur agent, desulfurization product simultaneously.Fine droplet
Form " mist " of 10～60 microns together with there is no the flue dust etc. of times washes clean, can cause heat exchanger,
Flues etc. are stained and heavy corrosion.
Demister is the drop that gas is carried secretly in knockout tower, to ensure to have mass-transfer efficiency, reduces and has valency
The loss of material of value and improve the operation of compressor after tower, general many arranges demister at tower top.Demister
It is mainly used in gas-liquid separation, can effectively remove " mist " of 10～60 microns, for the mist of 2～10 microns
Drip and flue dust removal efficiency is the highest.
The droplet of 2～10 microns carries and is mingled with flue dust and desulfurization slurry composition, droplet is mingled with flue dust and takes off
Sulfur serosity is to absorption tower content 20～35%, very big to the dustiness contribution degree of outlet, is that absorption tower outlet contains
The main source of dust quantity.The droplet of 2～10 microns is discharged in air, in the case of weather condition is preferable
Can remain lower solid content after water evaporation in droplet, part solid content particle diameter is below 2.5 μm, and it is main
Wanting composition is Gypsum Fibrosum and solubilized salt.The droplet of 2～10 microns is discharged in air, in air humidity very
In the case of great, droplet can condense moisture formation " chimney rain ".The mist of 2～10 microns that gypsum content is higher
Dripping and be discharged in air, in the case of air humidity is very big, droplet can condense moisture formation " gypsum rain ".
Therefore, current defogger system is relatively easy, and fault rate is high, super row's phenomenon often occurs.Also do not have
Have and reach minimum discharge requirement (flue dust, sulfur dioxide, droplet concentration of emission are respectively no higher than 10,35,50
Milligram/cubic meter), so existing traditional process system can not meet minimum discharge and run emission request.
Meanwhile, the calcium sulfite in existing desulfuration absorbing tower can not fully oxidized one-tenth calcium sulfate.Introducing
During oxidation air, oxygen dissolubility in slurry pool is the highest, and the most completely in view of blower fan temperature and
Heat dissipation problem.
Summary of the invention
For solving the problems referred to above, it is an object of the invention to provide the absorption tower of a kind of band air introducing device,
Simple in construction, add the dissolubility of oxygen, purified flue gas.
The invention provides the absorption tower of a kind of band air introducing device, including:
Absorption tower, its side is provided with absorption tower entrance and absorption tower outlet, and described absorption tower entrance is positioned at institute
Stating the middle part on absorption tower, the outlet of described absorption tower is positioned at the top on described absorption tower；
Slurry pool, it is positioned at the bottom on described absorption tower；
Spray equipment, it is positioned at described absorption tower, and is positioned at described absorption tower entrance and described absorption tower
Between outlet, described spray equipment include bottom-up be uniformly arranged the first spraying layer, the second spraying layer,
3rd spraying layer and the 4th spraying layer；
Two-stage demister, it is positioned at described absorption tower, described two-stage demister include the first demister and
Second demister, described first demister between described first spraying layer and described second spraying layer,
Described second demister is between described 3rd spraying layer and described 4th spraying layer；
Multi-stage stirring device, it is positioned at the bottom of described slurry pool, and described Multi-stage stirring device includes multiple
Absorption tower agitator；
Oxidation fan, oxidation air is introduced by it；
Air introducing device, its one end and described oxidation fan be connected, described air introducing device another
One end is stretched in described slurry pool；
Spraying ventilating device, fresh water (FW) is introduced at described oxidation fan by it.
Further improving as the present invention, described air introducing device includes that air introduces Zong Lu and five
Air introduces branch road, and the respectively first air introduces branch road, the second air introduces branch road, the 3rd air draws
Enter branch road, the 4th air introduces branch road and the 5th air introduces branch road, and described first air introduces branch road
Entrance, described second air introduce the entrance of branch road, described 3rd air introduces the entrance of branch road and described
4th air introduces the entrance of branch road, the entrance of described 5th air introducing branch road all introduces with described air
Total road is connected, and described air introduces total road and described oxidation fan and is connected, five air introducing branch roads
The top of described Multi-stage stirring device is all stretched in described slurry pool and is positioned in outlet.
Further improving as the present invention, described first air introduces branch road, described second air introduces
Branch road, described 3rd air introduce branch road, described 4th air introduces branch road and described 5th air introduces
The first valve, the second valve, the 3rd valve, the 4th valve and the 5th valve it is respectively equipped with on branch road.
Further improve as the present invention, described first valve, described second valve, described 3rd valve
Door, described 4th valve and described 5th valve are respectively positioned on outside described slurry pool.
Further improve as the present invention, described first valve, described second valve, described 3rd valve
Door, described 4th valve and described 5th valve are Hand-operated butterfly valve.
Further improve as the present invention, described first spraying layer, described second spraying layer, described
Multiple unidirectional nozzle all it is evenly arranged with on three spraying layers and described 4th spraying layer.
Further improving as the present invention, upward, described second sprays the nozzle on described first spraying layer
Drench the nozzle on layer down, the nozzle on described 3rd spraying layer upward, the spray on described 4th spraying layer
Mouth is down.
Further improving as the present invention, described Multi-stage stirring device includes four absorption tower agitators,
It is respectively the first absorption tower agitator, second absorption tower agitator, the 3rd absorption tower agitator and the 4th to inhale
Receive tower agitator.
Further improving as the present invention, described first absorption tower agitator and described second absorption tower stir
Mixing device and lay respectively at the side in described slurry pool, described 3rd absorption tower agitator and the described 4th absorbs
Tower agitator is positioned at the opposite side of described slurry pool.
Further improving as the present invention, described first absorption tower agitator and described 3rd absorption tower are stirred
Mixing device to be symmetrical arranged, described second absorption tower agitator and described 4th absorption tower agitator are symmetrical arranged.
The invention have the benefit that
1, simple in construction, energy consumption is low, it is easy to maintenance to overhaul, can run steadily in the long term；
2, in slurry pool, blast air by oxidation fan, make the calcium sulfite in slurry pool of absorption tower fill
Divide and be oxidized to calcium sulfate；
3, by spraying ventilating device, fresh water (FW) is introduced at oxidation fan, reduce the temperature at oxidation fan
Degree, increases oxygen dissolubility in slurry pool；
4, the drop making the flue gas after desulfurization carry secretly is received by separation in the two-stage demister that absorption tower exports
Collection, makes the droplet content of neat stress less than 50mg/Nm3(dry state)；
5, the deposition of solids in the serosity of absorption tower is prevented.
Accompanying drawing explanation
Fig. 1 is the structural representation on the absorption tower of a kind of band air introducing device described in the embodiment of the present invention.
In figure,
1, absorption tower；11, absorption tower entrance；12, absorption tower outlet；2, slurry pool；31, first
Spraying layer；32, the second spraying layer；33, the 3rd spraying layer；34, the 4th spraying layer；41, first inhales
Receive tower agitator；42, second absorption tower agitator；43, the 3rd absorption tower agitator；44, the 4th inhales
Receive tower agitator；51, the first air introduces branch road；52, the second air introduces branch road；53, the 3rd is empty
Gas introduces branch road；54, the 4th air introduces branch road；55, the 5th air introduces branch road；61, the first valve
Door；62, the second valve；63, the 3rd valve；64, the 4th valve；65, the 5th valve；7, oxidation
Air；8, spraying ventilating device；9, oxidation fan；101, the first demister；102, second mist is removed
Device.
Detailed description of the invention
Below by specific embodiment and combine accompanying drawing the present invention is described in further detail.
Embodiment 1, as it is shown in figure 1, the absorption tower of a kind of band air introducing device of the embodiment of the present invention,
Including absorption tower, spray equipment, two-stage demister, Multi-stage stirring device, air introducing device.Spray
Device is positioned at absorption tower internal upper part, and two-stage demister is between spray equipment, and Multi-stage stirring device is positioned at
Bottom absorption tower, air introducing device is positioned at outside absorption tower, introduces air into absorption by oxidation fan
Tower bottom.
The side on absorption tower 1 is provided with absorption tower entrance 11 and absorption tower outlet 12, absorption tower entrance 11
In the middle part on absorption tower 1, absorption tower outlet 12 is positioned at the top on absorption tower 1.Slurry pool 2 is positioned at absorption
The bottom of tower 1.Spray equipment is positioned at absorption tower 1, and is positioned at absorption tower entrance 11 and absorption tower outlet
Between 12, spray equipment include bottom-up be uniformly arranged first spraying layer the 31, second spraying layer 32,
3rd spraying layer 33 and the 4th spraying layer 34.Two-stage demister is positioned at absorption tower 1, two-stage demister bag
Including the first demister 101 and the second demister 102, the first demister 101 is positioned at the first spraying layer 31 He
Between second spraying layer 32, the second demister 102 be positioned at the 3rd spraying layer 33 and the 4th spraying layer 34 it
Between.Multi-stage stirring device is positioned at the bottom of slurry pool 2, and Multi-stage stirring device includes that multiple absorption tower is stirred
Device.Oxidation air 7 is introduced air introducing device by oxidation fan 9.One end of air introducing device and oxygen
Wind-transformation machine 9 be connected, the other end of air introducing device stretches in slurry pool 2.Spraying ventilating device 8
Fresh water (FW) is introduced at oxidation fan 9 by it.
Air introducing device includes that air introduces Zong Lu and five air introduce branch road, the respectively first air
Introduce branch road the 51, second air and introduce introducing branch road the 53, the 4th air introducing of branch road the 52, the 3rd air
Road 54 and the 5th air introduce branch road 55, and the first air introduces the entrance of branch road 51, the second air introduces
The entrance of branch road 52, the entrance of the 3rd air introducing branch road 53 and the entrance of the 4th air introducing branch road 54,
5th air introduces the entrance of branch road 55 and is all connected with the total road of air introducing, and air introduces total road and oxidation wind
Machine 9 be connected, five air introduce the outlet of branch roads and all stretch in slurry pool 2 and be positioned at Multi-stage stirring dress
The top put.
Wherein, the first air introduces branch road the 51, second air and introduces branch road the 52, the 3rd air introducing branch road
53, the 4th air introduce branch road 54 and the 5th air introduce be respectively equipped with on branch road 55 first valve 61,
Second valve the 62, the 3rd valve the 63, the 4th valve 64 and the 5th valve 65.First valve 61, second
Valve the 62, the 3rd valve the 63, the 4th valve 64 and the 5th valve 65 are respectively positioned on outside slurry pool 2.Preferably
, first valve the 61, second valve the 62, the 3rd valve the 63, the 4th valve 64 and the 5th valve 65 are equal
For Hand-operated butterfly valve.
On first spraying layer the 31, second spraying layer the 32, the 3rd spraying layer 33 and the 4th spraying layer 34 the most equal
Even it is provided with multiple unidirectional nozzle.Wherein, the nozzle on the first spraying layer 31 upward, the second spraying layer 32
On nozzle down, upward, the nozzle on the 4th spraying layer 34 is down for the nozzle on the 3rd spraying layer 33.
Multi-stage stirring device includes four absorption tower agitators, the respectively first absorption tower agitator 41,
Two absorption tower agitator the 42, the 3rd absorption tower agitator 43 and the 4th absorption tower agitators 44.Wherein,
First absorption tower agitator 41 and second absorption tower agitator 42 lay respectively at the side in slurry pool 2,
3rd absorption tower agitator 43 and the 4th absorption tower agitator 44 are positioned at the opposite side of slurry pool 2.Excellent
Choosing, the first absorption tower agitator 41 and the 3rd absorption tower agitator 43 are symmetrical arranged, second absorption tower
Agitator 42 and the 4th absorption tower agitator 44 are symmetrical arranged.
Time specifically used, in slurry pool, blast air by oxidation fan, make in slurry pool of absorption tower
Calcium sulfite oxidation becomes calcium sulfate；For increasing oxygen dissolubility in slurry pool, due to from oxidation wind
Air themperature higher (110 DEG C) left and right of machine, needs first to carry out lower the temperature (controlling at about 40～50 DEG C),
Enter back into absorption tower.
Oxidation fan preferentially chooses centrifugal blower, then design air flow presses the 110% of value of calculation, and pressure head is by calculating
120% consideration of value；If choosing roots blower, then design air flow presses the 110% of value of calculation, pressure head by based on
110% consideration of calculation value, and consider to alleviate blower fan vibrations and noise, and ensure the measure of heat radiation.Oxidation wind
Pipe is pressed ductwork type in principle and is arranged consideration.
The drop that flue gas after desulfurization is carried secretly is separated and collected in the two-stage demister that absorption tower exports, and makes
The droplet content of neat stress is less than 50mg/Nm3(dry state).
For preventing the deposition of solids in the serosity of absorption tower, it is provided with four absorption tower slurry mixers,
During desulfurization, the serosity in slurry pool is carried out uniform non-stop stirring, absorption tower serosity can be prevented
The deposition of middle solids.Emergency power supply is all entered in the agitator suggestion of four, absorption tower.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for this
For the technical staff in field, the present invention can have various modifications and variations.All spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement etc. made, should be included in the protection of the present invention
Within the scope of.
Claims (10)
1. the absorption tower of a band air introducing device, it is characterised in that including:
Absorption tower (1), its side is provided with absorption tower entrance (11) and absorption tower outlet (12), described suction
Receiving tower entrance (11) and be positioned at the middle part of described absorption tower (1), described absorption tower outlet (12) is positioned at institute
State the top of absorption tower (1)；
Slurry pool (2), it is positioned at the bottom of described absorption tower (1)；
Spray equipment, it is positioned at described absorption tower (1), and be positioned at described absorption tower entrance (11) and
Between described absorption tower outlet (12), described spray equipment includes bottom-up the first spray being uniformly arranged
Drench layer (31), the second spraying layer (32), the 3rd spraying layer (33) and the 4th spraying layer (34)；
Two-stage demister, it is positioned at described absorption tower (1), and described two-stage demister includes first except mist
Device (101) and the second demister (102), described first demister (101) is positioned at described first spray
Between layer (31) and described second spraying layer (32), described second demister (102) is positioned at described the
Between three spraying layers (33) and described 4th spraying layer (34)；
Multi-stage stirring device, it is positioned at the bottom of described slurry pool (2), and described Multi-stage stirring device includes
Multiple absorption towers agitator；
Oxidation fan (9), oxidation air (7) is introduced by it；
Air introducing device, its one end and described oxidation fan (9) be connected, described air introducing device
The other end stretch in described slurry pool (2)；
Spraying ventilating device (8), fresh water (FW) is introduced described oxidation fan (9) place by it.
Absorption tower the most according to claim 1, it is characterised in that described air introducing device includes
Air introduces Zong Lu and five air introduce branch road, and the respectively first air introduces branch road (51), the second sky
Gas introduces branch road (52), the 3rd air introduces branch road (53), the 4th air introduces branch road (54) and the
Five air introduce branch road (55), and described first air introduces the entrance of branch road (51), described second air
Introduce the entrance of branch road (52), described 3rd air introduces the entrance of branch road (53) and described 4th sky
Gas introduce branch road (54) entrance, described 5th air introduce branch road (55) entrance all with described sky
Gas introduces total road and is connected, and described air introduces total road and described oxidation fan (9) and is connected, five air
The outlet introducing branch road is all stretched in described slurry pool (2) and is positioned at the top of described Multi-stage stirring device.
Absorption tower the most according to claim 2, it is characterised in that described first air introduces branch road
(51), described second air introduces branch road (52), described 3rd air introduces branch road (53), described the
Four air introduce branch road (54) and described 5th air introduces and is respectively equipped with the first valve on branch road (55)
(61), the second valve (62), the 3rd valve (63), the 4th valve (64) and the 5th valve (65).
Absorption tower the most according to claim 3, it is characterised in that described first valve (61),
Described second valve (62), described 3rd valve (63), described 4th valve (64) and the described 5th
Valve (65) is respectively positioned on described slurry pool (2) outward.
Oxidation air system the most according to claim 4, it is characterised in that described first valve (61),
Described second valve (62), described 3rd valve (63), described 4th valve (64) and the described 5th
Valve (65) is Hand-operated butterfly valve.
Absorption tower the most according to claim 1, it is characterised in that described first spraying layer (31),
On described second spraying layer (32), described 3rd spraying layer (33) and described 4th spraying layer (34) all
It is evenly arranged with multiple unidirectional nozzle.
Absorption tower the most according to claim 6, it is characterised in that described first spraying layer (31)
On nozzle upward, the nozzle on described second spraying layer (32) down, described 3rd spraying layer (33)
On nozzle upward, the nozzle on described 4th spraying layer (34) is down.
Absorption tower the most according to claim 1, it is characterised in that described Multi-stage stirring device includes
Four absorption tower agitators, the respectively first absorption tower agitator (41), second absorption tower agitator (42),
3rd absorption tower agitator (43) and the 4th absorption tower agitator (44).
Absorption tower the most according to claim 8, it is characterised in that described first absorption tower agitator
(41) and described second absorption tower agitator (42) lays respectively at the side in described slurry pool (2),
Described 3rd absorption tower agitator (43) and described 4th absorption tower agitator (44) are positioned at described serosity
Opposite side in pond (2).
Absorption tower the most according to claim 9, it is characterised in that described first absorption tower stirring
Device (41) and described 3rd absorption tower agitator (43) are symmetrical arranged, described second absorption tower agitator
(42) it is symmetrical arranged with described 4th absorption tower agitator (44).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610516161.5A CN106000066A (en) | 2016-07-01 | 2016-07-01 | Absorbing tower with air introducing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610516161.5A CN106000066A (en) | 2016-07-01 | 2016-07-01 | Absorbing tower with air introducing device |
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| CN106000066A true CN106000066A (en) | 2016-10-12 |
Family
ID=57106692
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610516161.5A Pending CN106000066A (en) | 2016-07-01 | 2016-07-01 | Absorbing tower with air introducing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107684812A (en) * | 2017-09-19 | 2018-02-13 | 于维礼 | Oxidizing process in low-pressure oxidized slurries system and liquid |
| CN113750772A (en) * | 2021-08-12 | 2021-12-07 | 华能国际电力股份有限公司营口电厂 | Energy-saving system applied to oxidation fan and operation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107684812A (en) * | 2017-09-19 | 2018-02-13 | 于维礼 | Oxidizing process in low-pressure oxidized slurries system and liquid |
| CN113750772A (en) * | 2021-08-12 | 2021-12-07 | 华能国际电力股份有限公司营口电厂 | Energy-saving system applied to oxidation fan and operation method thereof |
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