CN201537454U - Desulphurization tower for desulphurization through ammonia process - Google Patents

Desulphurization tower for desulphurization through ammonia process Download PDF

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Publication number
CN201537454U
CN201537454U CN200920168767XU CN200920168767U CN201537454U CN 201537454 U CN201537454 U CN 201537454U CN 200920168767X U CN200920168767X U CN 200920168767XU CN 200920168767 U CN200920168767 U CN 200920168767U CN 201537454 U CN201537454 U CN 201537454U
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China
Prior art keywords
tower
gas
desulfurizing
ammonia
venturi tube
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Expired - Fee Related
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CN200920168767XU
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Chinese (zh)
Inventor
甘腊根
解娟
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RINO INTERNATIONAL CORP
Dalian Rino Environment Engineering Science and Technology Co Ltd
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RINO INTERNATIONAL CORP
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Priority to CN200920168767XU priority Critical patent/CN201537454U/en
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Abstract

The present utility model relates to a desulphurization tower for the desulphurization through an ammonia process. The desulphurization tower which uses an ammoniacal liquor to remove SO2 from an air containing SO2 comprises an inner tower (21), an outer tower surrounding the inner tower (21), an air inlet (19), an air outlet (12) and at least one ammoniacal liquor sprayer (15). The air enters from the air inlet (19) into the desulphurization tower via spaces (9) in the inner tower (21) and between the inner tower and the outer tower, contacts with the ammoniacal liquor sprayed by the at least one ammoniacal liquor sprayer, and is discharged through the air outlet (12). The desulphurization tower of the utility model has advantages of compact conformation, small occupation area and good effect of desulphurization and dust-removing.

Description

The desulfurizing tower that is used for the ammonia process of desulfurization
Technical field
The utility model relates to the desulfurizing tower that is used for the ammonia process of desulfurization, more specifically, relates to the integrated desulfurization tower with desulfurization and dedusting function.
Background technology
The pretreatment procedure of metallurgical industry comprises operations such as coking, sintering.Contain relatively large ammonia (NH in the coke-stove gas of coking process on the one hand 3H 2O) need to handle, on the other hand, contain a large amount of sulfur dioxide (SO in the waste gas that sintering circuit is discharged 2), nitrogen oxide (NO x) and flue dust, these all belong to the material of atmosphere pollution.
The method that past adopts milk of lime to absorb when handling these waste water and waste gas mostly, the efficient that sulphur removal is denitrogenated is not high, and the CaSO that generates after processing 4And Ca (NO 3) 2Do not have actual industrial use, the land occupation area is bigger behind the landfill.
Because the past is to handle in different process systems respectively to the coke-stove gas of coking process and the sinter fume of sintering circuit, therefore cause cost height, the floor space of equipment big.So wishing a kind of equipment cost of exploitation, low operating cost is low again, floor space is little and can handle the new equipment of above-mentioned two kinds of refuses simultaneously.
CN 201101940Y discloses a kind of spray desulfurizing tower, contains main tube and secondary tube.The upper end of this master's tube and secondary tube is connected, to constitute the inverted u-shaped flue.Into mouth and outlet flue are arranged respectively at the bottom of main tube and secondary tube, and there are some annular spray pipes at main tube inner chamber middle part, is evenly equipped with water jet on the annular spray pipe.Be characterized in all having on each annular spray pipe the eddy flow plate of some layouts of shapes in the shape of a spiral.This tower can be used in particular for coal-burning type boiler or kiln institute smoke discharging are carried out desulfurization and dedusting.
CN 2439901Y discloses a kind of pair of circulation two-part fume desulfurizing tower, it comprises body of the tower, the body of the tower side lower part is provided with the boiler smoke inlet, the bottom of body of the tower is provided with the air apparatus for feeding and desulfuration byproduct is handled retracting device, the composition desulfurization absorber portion of conduit is sprayed in overflowing board in body of the tower inlet top, the body of the tower and the set desulfurization in overflowing board top, body of the tower top is provided with air inducing mechanism and air exit, it is characterized in that described desulfurization absorber portion can be two sections.
CN 1408464A discloses SO in the flue gas 2Remove and recovery method and device, described device comprises a desulfurizing tower, this desulfurizing tower comprises SO 2Absorber portion, sulfite oxidation section, ammonium sulfate enriching section, washing section and remove the mist section.
Although proposed above-mentioned desulfurizer, but still need have the integrated desulfurization tower of desulfurization and dedusting function, this desulfurizing tower should have compact conformation, occupation of land is little, desulfurization and dedusting is respond well characteristics, to satisfy the needs on the current industrial.
The utility model content
In order to solve the problems of the technologies described above, the utility model designer has proposed a kind of integrated desulfurization tower with desulfurization and dedusting function through unremitting effort, has realized the purpose of this utility model thus.
In one aspect, the utility model relates to a kind of being used for by ammoniacal liquor from containing SO 2Gas in remove SO 2Desulfurizing tower, comprise interior tower, outer tower, gas access, gas vent and at least one ammonia spray device around interior tower, described gas enters desulfurizing tower from the gas access, flow through space between Nei Ta and Nei Ta and the outer tower, contact with the ammoniacal liquor of described at least one ammonia spray device ejection, discharge through gas vent.
Because the described SO that contains 2Flow through space between Nei Ta and Nei Ta and the outer tower of gas, therefore, under the certain situation of body of the tower height, the design of this inside and outside double tower tube can provide long gas passage, contains SO 2Gas have more opportunity to contact with ammoniacal liquor, thereby desulfurization, to take off dirt effective.And under limited body of the tower height, Ta Nei can be provided with other more device, for example demist, dust arrester, and therefore, the gas of discharging from desulfurizing tower contains less dust or entrapped moisture.
Make and contain SO 2Gas stream not only through Nei Ta but also flow through Nei Ta and outside the mode in space between the tower have multiplely, for example, the entrance and exit of described gas is positioned on the different tower bodies, for example, the gas access is positioned at Nei Ta and gas vent is positioned at outer tower.
In a specific embodiment, the gas access is positioned at the top of tower, and gas vent is positioned at the top of outer tower, interior tower the bottom with outside tower keep fluid to be communicated with.
The top of so-called tower is meant that this part is higher than 1/2 or 2/3 or 3/4 of tower height degree, or the like.
For tower in making keeps fluid to be communicated with in the bottom with outer tower, can be provided with at least one through hole at interior tower bottom, the feasible ammonia that passes through is washed later gas and has been absorbed SO 2The liquid later with flue dust can continue to flow to next stage.Preferably, keep unlimited fully at the bottom of the interior Tata, promptly interior tower does not have the tower base plate.
In a specific embodiment, the gas access is positioned at the top of tower.The cross section of gas access is preferably square.
In an embodiment of the present utility model, Nei Tazhong is provided with at least one Venturi tube.
Venturi tube is called Venturi scrubber again, mainly comprises collapsible tube (or claiming contraction section), trunnion (or claiming conversion zone) and enlarged tube (or claiming diffuser) three parts.This three partial cross section varies in size, and wherein dwindles gradually from the cross section of collapsible tube to trunnion, is minimum to the trunnion place, enlarges gradually to enlarged tube from trunnion then.When gas when collapsible tube flows into because the reduced cross-sectional of pipe, flow velocity increases and pressure reduces, and is minimum to trunnion place pressure.If the arm that can feed liquid is installed herein, liquid is just sucked by high velocity air and atomizes.Grit in the gas contacts with drop and is wetted.After entering enlarged tube, flow velocity reduces gradually, and grit binds mutually, makes particle increase and easily removes.
According to preferred implementation of the present utility model, the number of Venturi tube is preferably 3 to 7 in the interior tower, more preferably 3.
If be provided with two or more Venturi tubes, these Venturi tubes preferably are arranged in parallel on gas flow direction.
Preferably, aforementioned at least one ammonia spray device is arranged in described at least one Venturi tube conversion zone (trunnion).At this, contain SO 2Gas in SO 2React with ammoniacal liquor, thereby reach the purpose of desulfurization from gas.
Can design Venturi tube used in the utility model, make that the flow velocity of gas in each Venturi tube conversion zone (trunnion) is 23 to 33 meter per seconds.Because ammoniacal liquor and SO 2Reaction properties finds relatively that through the utility model designer the gas flow rate of 23 to 33 meter per seconds is preferable flow rates.The droplet of gas and mixing is turbulence state under this flow velocity, and the effect of heat transfer, mass transfer is better.
The means that realize above-mentioned flow rates have multiple, for example, can regulate the sectional area of contraction section and conversion zone, the flow velocity of adjustments of gas inlet etc.Those skilled in the art can freely select as required.
The speed of gas when entering each Venturi tube for example can be 15 meter per seconds.
According to preferred implementation of the present utility model, on gas flow direction, be provided with the even distributor of gas in the upstream of Venturi tube, its effect is to transfer at the flue gas with horizontal direction guaranteeing in straight down the process bias current does not take place, thus with the gas uniform distribution to each Venturi tube.
The even distributor of described gas is preferably 60 ° cone.Its length is preferably 4 meters.
Between even distributor of gas and gas access, preferably have old name for the Arabian countries in the Middle East's ground circle structure, be used to realize the transition of gas access and the even distributor of gas.
According to preferred implementation of the present utility model, at the bottom of the desulfurization Tata or in the desulfurizing tower outside, be provided with the circulation liquid pool, be used for splendid attire ammoniacal liquor and contain SO 2Gas reaction after the liquid that obtains.This liquid contains as yet the not ammonia of complete reaction, can be used as circulation fluid and returns the interior continuation of tower and contain SO 2Gas reaction, thereby the investment of saving ammonia.Therefore, preferably, have at least one circulation fluid spray equipment in the desulfurizing tower, be used to spray circulation fluid from the circulation liquid pool.In an optimal way, in the conversion zone of each Venturi tube, be provided with at least one circulation fluid spray equipment.
Desulfurizing tower of the present utility model also preferably has cyclone, and this cyclone preferably is positioned at the downstream of Venturi tube on gas flow direction.
Hydrocyclone structure makes the gas tangential motion and produces centrifugal force, changed the direction of motion of the dust after increasing, with its get rid of Xiang Tabi by the water band at the bottom of tower.Circulation fluid is squeezed into desulfurizing tower once more through circulating pump simultaneously, and reactant liquor is the whirlwind shape with the residue reacting gas and circulates under the effect of cyclone, forms two road water curtains to catch particulates such as escape ammonia, sulphur ammonium at Ta Bichu.Further increase the reaction time of gas-liquid, prevented the escape of unreacted ammonia.This unique design has prolonged the absorption reaction time, makes desulphurization reaction more thorough.
Cyclone preferably is embedded between the inside and outside tower, the cyclone outer wall is near outer inner wall of tower and keep a fixed gap, guarantee that the liquid that cyclone rotation and demister get off flows down along outer tower wall, the cyclone inwall is near interior tower outer wall and maintain a fixed gap, guarantees that cyclone rotation and reaction back gas enter cyclone smoothly.Cyclone inside guarantees that along the outer wall tangential direction eddy flow plate that evenly distributes gas-liquid flows along the barrel tangential direction, and eddy flow flows down.
Desulfurizing tower of the present utility model also preferably has at least one dehydrating demisting device.
Demister is used for knockout tower gas droplets entrained, further catches escape ammonia and sulphur ammonium and carries out gas-liquid separation.
Preferably, demister is positioned at the gas vent below, is looped around equally between Wai Ta and the interior tower.Demister becomes " Z " font, gas and carry drop bump demist wall, and flow direction takes place to change several times, and drop is captured and flows down simultaneously, can effectively remove the drop that carries in the gas thus.
Described at least one dehydrating demisting device is preferably placed at the downstream of cyclone, and more preferably, the downstream of gas flow direction is a dehydrating demisting device, promptly is provided with dehydrating demisting device near gas vent.
Preferably, the described SO that contains of desulfurizing tower processing of the present utility model 2Gas be the sinter fume that the metallurgical industry sintering circuit is discharged.In addition, the waste liquid that also preferred described ammoniacal liquor is discharged from the metallurgical industry coking process, but sample makes full use of refuse like this, saves the ammonia cost, can also save the process equipment of independent processing coking waste liquid.
Such as known in the art, the inner tower and outside tower of the utility model desulfurizing tower can have various suitable shapes, but is generally cylindrical.
Description of drawings
Fig. 1 is the sectional view according to the desulfurizing tower of a preferred embodiment of the utility model.
Fig. 2 is the sectional drawing of desulfurizing tower shown in Figure 1 along A-A.
The implication of each mark is as follows among Fig. 1:
The 1-aerator
The 2-sewage draining exit
The outlet of 3-circulation fluid
The 4-circulation fluid advances pump line
5-circulation liquid pool
The 6-cyclone
7,13,16-circulation fluid spray equipment
8-Venturi tube diffuser
Space between 9-Nei Ta and the outer tower
The double-deck dehydrating demisting device of 10-
11-third level dehydrating demisting device
The 12-gas vent
14-Venturi tube conversion zone
15-ammonia spray device
17-Venturi tube contraction section
The even distributor of 18-gas
The 19-gas access
The 20-exhaust outlet
Tower in the 21-
The specific embodiment
Specifically describe preferred embodiment of the present utility model below in conjunction with Fig. 1, but the utility model is not limited thereto.
To introduce desulfurizing tower of the present utility model from the sinter fume that the metallurgical industry sintering circuit is discharged by gas access 19 with square sectional.Described flue gas contains SO 2And dust.
As shown in Figure 1, desulfurizing tower has interior tower 21 and Wai Ta, and interior tower 21 is not provided with the tower base plate, keeps being communicated with outer tower thus.Gas access 19 is positioned at the top of tower 21.
After the tower, be downward through old name for the Arabian countries in the Middle East's ground circle structure in flue gas enters, enter equably in the Venturi tube of three parallel connections through the even distributor 18 of gas then.The even distributor 18 of described gas is that a drift angle is 60 ° a cone.
The conversion zone 14 of each Venturi tube is provided with circulation fluid spray equipment 13,16 and at least one ammonia spray device 15.The circulation fluid spray equipment links to each other with hereinafter described circulation liquid pool 5, therefrom draws circulation fluid.The waste liquid that ammoniacal liquor in the ammonia spray device 15 is discharged from the metallurgical industry coking process.Because gas is in the high velocity effect of Venturi tube conversion zone 14, circulation fluid and ammoniacal liquor spray from spray equipment separately respectively, and are atomized, thus with enter contained SO in the gas 2Fully contact and reaction.
Speed was 15 meter per seconds when flue gas entered each Venturi tube contraction section 17, and the speed in conversion zone 14 is 23 meter per seconds.
At least removed part SO 2Gas be downward through the diffuser 8 of each Venturi tube, folding and upwards flow to space 9 between Nei Ta and the outer tower.Ammoniacal liquor and circulation fluid are absorbing SO 2With flow into downwards the circulation liquid pool 5 that is positioned at the bottom of the tower after the flue dust.
At the diffuser 8 of Venturi tube, contained aforementioned SO in the liquid phase 2With contained NO in the product ammonium sulfite of ammonia and the flue gas 2Oxidation reaction takes place, and generates ammonium sulfate.Be shown below:
NO 2+(NH 4) 2SO 3=(NH 4) 2SO 4+NO
Circulation liquid pool 5 bottoms are provided with aerator 1, feed oxygen rich gas by this aerator, and for example air generates ammonium sulfate with the sulfite oxidation that still has neither part nor lot in reaction.Be shown below:
(NH 4) 2SO 3+1/2?O 2=(NH 4) 2SO 4
Circulation liquid pool 5 also is provided with circulation fluid outlet 3, circulation fluid advances pump line 4.Wherein the circulation fluid outlet links to each other with described circulation fluid spray equipment, is used for from the circulation liquid pool to circulation fluid spray equipment delivery cycle liquid.Where necessary, can also be provided with pump between circulation liquid pool and the circulation fluid spray equipment, be used for extracting circulation fluid from the circulation liquid pool.
Also can be provided with sewage draining exit 2 at the bottom of the tower of desulfurizing tower (outer tower).
The gas that flows to space between Nei Ta and the outer tower at first passes through cyclone 6, and is separated from the gas at this spray liquid, and fog is thrown toward in the circulation fluid at the bottom of the tower wall flow to tower, the gas rotation upwards, the reverse spray liquid that is recycled spray equipment 7 is caught.The effect of cyclone 6 is: prolong the reaction time, play dehydration again.
Upwards the gas that flows flows to double-deck dehydrating demisting device 10 and third level dehydrating demisting device 11 after being recycled spray equipment 7 further desulfurization, after gas vent 12 is discharged desulfurizing tower.
Also can be provided with exhaust outlet 20 on the outer tower, send gas access 19 again back to, to strengthen desulfurized effect with the gas that will flow through Venturi tube diffuser 8.
The desulfurizing tower structure of reactor of the utility model particular design can produce multiple effect.Except ammonia and SO 2Outside the generation chemical reaction, dust produces violent disturbance after entering desulfurizing tower, run foul of each other and gather, make grit increase, simultaneously the surface of dirt is replaced by liquid-solid interface by original gas-solid interface, the surface of dust replaces air film by moisture film, produces absorption, coacervation, and between dust, form the liquid bridge, thereby strengthened the trapping ability of sub-micron dust.When dust passes through double-deck circulation liquid film in flue gas back process, capture effect again and further strengthen, improved total efficiency of dust collection of dust pelletizing system.
Embodiment
Adopt desulfurizing tower shown in Figure 1 to experimentize.
1) desulfurizing tower important technological parameters:
Desulfurizing tower pattern spray tower
Pressure 4000Pa is born in design
Desulfurizing tower diameter 13.9m
Desulfurizing tower total height 40.5m
Single tower demister progression 3
The demister backwashing manner is interrupted
2) this desulfurizing tower moves under the working condition shown in the table 1:
Table 1 desulfurizing tower working condition
Exhaust gas volumn m 3/h 2100000 (operating modes)
Flue-gas temperature 130
TRANSIENT HIGH TEMPERATURE 150
The fault temperature 180
Dustiness mg/m 3 ≤120mg/Nm 3
SO 2Concentration mg/Nm 3 ?500~1500
Water capacity Volume % 6.27
3) desulfurized effect is as follows:
Ammonia concn 5%, the flow that enters in the desulfurizing tower is 10m 3/ h, the flow velocity that enter in the Venturi tube conversion zone this moment is 23 meter per seconds.In sintered discharge gas, exhaust gas volumn is 2,100,000 air quantity, has so moved one month.Desulfurization degree is more than 95% as a result, the SO in combustion gas 2Be 100mg/Nm 3Below, dustiness 30mg/Nm 3Below.
This shows that desulfurating dust-removing equipment of the present utility model has good dust-removal and desulfurizing effect, and simple to operate, easy to maintenance, the flue gas after the purification can reach discharging standards.

Claims (14)

1. the desulfurizing tower that is used for the ammonia process of desulfurization, its by ammoniacal liquor from containing SO 2Gas in remove SO 2, it is characterized in that comprising interior tower (21), outer tower, gas access (19), gas vent (12) and at least one ammonia spray device (15), its China and foreign countries' tower is around interior tower (21), and Nei Ta and outside have space (9) between the tower.
2. the described desulfurizing tower of claim 1, wherein gas access (19) are positioned on the tower (21), and gas vent (12) is positioned at Wai Tashang.
3. claim 1 or 2 described desulfurizing towers, wherein gas access (19) are positioned at the top of tower (21), gas vent (12) is positioned at the top of outer tower, interior tower (21) the bottom with outside tower keep fluid to be communicated with.
4. claim 1 or 2 described desulfurizing towers are provided with at least one Venturi tube in the wherein interior tower (21), and each Venturi tube comprises contraction section (17), conversion zone (14) and diffuser (8).
5. the described desulfurizing tower of claim 4 is provided with 3 to 7 Venturi tubes in the wherein interior tower (21).
6. the described desulfurizing tower of claim 4 is provided with 3 Venturi tubes in the wherein interior tower (21).
7. the described desulfurizing tower of claim 4, wherein said at least one ammonia spray device (15) is arranged in Venturi tube conversion zone (14).
8. the described desulfurizing tower of claim 4 wherein is provided with the even distributor of gas (18) in the upstream of Venturi tube on gas flow direction.
9. the described desulfurizing tower of claim 8, the even distributor of wherein said gas (18) is 60 ° a cone.
10. claim 1 or 2 described desulfurizing towers wherein are provided with circulation liquid pool (5) at the bottom of this desulfurization Tata or in the desulfurizing tower outside.
11. claim 1 or 2 described desulfurizing towers, wherein this desulfurizing tower has at least one circulation fluid spray equipment (7,13,16).
12. claim 1 or 2 described desulfurizing towers, wherein this desulfurizing tower has cyclone (6).
13. the described desulfurizing tower of claim 12, wherein cyclone (6) is positioned at the downstream of Venturi tube on gas flow direction.
14. claim 1 or 2 described desulfurizing towers, wherein this desulfurizing tower has dehydrating demisting device (10,11).
CN200920168767XU 2009-08-19 2009-08-19 Desulphurization tower for desulphurization through ammonia process Expired - Fee Related CN201537454U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102553430A (en) * 2012-02-23 2012-07-11 中电投远达环保工程有限公司 Bicyclic high-efficiency desulfurization absorption tower and desulfurization system employing tower
CN106076089A (en) * 2016-08-16 2016-11-09 攀枝花市九鼎智远知识产权运营有限公司 A kind of desulphurization denitration vent gas treatment tower
TWI635892B (en) * 2013-08-20 2018-09-21 奧托昆布公司 Method for removing dust and sulphur oxides from process gases
CN109647163A (en) * 2018-12-21 2019-04-19 大田县伊鑫新型材料有限公司 A kind of dry-process cement rotary kiln ammonia process semidry process desulfurizer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102553430A (en) * 2012-02-23 2012-07-11 中电投远达环保工程有限公司 Bicyclic high-efficiency desulfurization absorption tower and desulfurization system employing tower
TWI635892B (en) * 2013-08-20 2018-09-21 奧托昆布公司 Method for removing dust and sulphur oxides from process gases
CN106076089A (en) * 2016-08-16 2016-11-09 攀枝花市九鼎智远知识产权运营有限公司 A kind of desulphurization denitration vent gas treatment tower
CN106076089B (en) * 2016-08-16 2018-10-02 苏州仕净环保科技股份有限公司 A kind of desulphurization denitration vent gas treatment tower
CN109647163A (en) * 2018-12-21 2019-04-19 大田县伊鑫新型材料有限公司 A kind of dry-process cement rotary kiln ammonia process semidry process desulfurizer

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