CN209254479U - A kind of prewashing device of flue gas dechlorination - Google Patents
A kind of prewashing device of flue gas dechlorination Download PDFInfo
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- CN209254479U CN209254479U CN201821796132.XU CN201821796132U CN209254479U CN 209254479 U CN209254479 U CN 209254479U CN 201821796132 U CN201821796132 U CN 201821796132U CN 209254479 U CN209254479 U CN 209254479U
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Abstract
The utility model is a kind of prewashing device of flue gas dechlorination, prewashing tower including cylindrical body, the exhaust pass for being set to the gas approach of prewashing tower bottom and being set to prewashing top of tower, the inner wall of the prewashing tower is fixedly installed spiral smoke deflector, the tangent connection in the lower end of the smoke deflector and the upper end of gas approach, the tangent connection in lower end of the upper end of the smoke deflector and the exhaust pass, it is provided with spray tube on the axis of the prewashing tower, is provided with several spray throwers from top to bottom on spray tube.The utility model carries out prewashing to flue gas before desulfurizing tower, pass through 85% or more the hydrogen chloride gas with alkaline reaction absorbing and removing flue gas, chloride ion content in slurries can be reduced, prevent the corrosion to material in tower, the quality for improving desulfuration byproduct is provided with concentration and evaporation crystallization apparatus, and most hydrogen chloride can be removed by the prewashing system in flue gas, and the purity of sodium chloride can be relatively high in byproduct, can obtain high-quality Nacl.
Description
Technical field
The utility model belongs to fume treatment field, and in particular to a kind of prewashing device of flue gas dechlorination.
Background technique
Currently, more and more coal-burning power plants, sintering plant and pelletizing plant use different flue gas desulfurization devices to reduce
Sulfur dioxide (SO2) emissions, wherein ammonia-process desulfurization technique is applied more, and not only desulfuration efficiency is higher, and can have economic value with output
Thiamine fertilizer.But can accumulate in the desulfurization slurry constantly recycled has very high chlorinity, will affect the quality of thiamine fertilizer,
It also can be harmful to desulfurization operation.The harm of chloride ion is mainly reflected in two aspects in slurries: first is that chloride ion is to desulfurizing tower
The corrosion of internals especially increases to strengthen gas-liquid contact or raising demisting efficiency etc. in tower after environmental requirement minimum discharge
Moving component corrosion；Second is that increasing desulfurization product chloride ion content, the value of byproduct is influenced.Research shows that chloride ion
> 1000mg/L has high polarity to promote corrosion reaction in water for a long time, and has very strong penetrability, penetrates readily through metal watch
The protective film in face, gap corrosion and pitting.In chemical industry, many austenitic steel equipment anti-chlorine ion corrosion performances
It is poor.And at present, chloride ion content is more than 10000mg/L in many power plant's wet desulphurization slurries, and operation risk is very big, and control is de-
Chloride ion content≤5000mg/L in sulphur slurries becomes the index of power plant's control chlorine.
CN201420827764.3 discloses a kind of device of flue gas removing hydrogen chloride gas.Including absorption chamber, water distributor,
Water feeding tank, overflow valve, plate washer, water collection device, water circulating pump, cyclic water tank and overflow valve；Multiple plate washers are vertically mounted on absorption
The gridding space of several absorbing hydrogen chloride gases is formed on the top of room, however structure is complicated for technical solution, the removal rate of chlorine
It is not high.CN201511007845.4 discloses a kind of method of desulfurization slurry dechlorination, is to sulphur ammonium-limestone-based process flue gas desulfurization slurry
The removing of chloride ion in liquid is taken and supplements the mode being electrolysed after ammonium sulfate to the dehydrated filtrate of desulfurized gypsum, directly releases hydrogen
Gas and chlorine, then agitated kettle further discharge chlorine, and the filtered fluid of dechlorination sends absorption tower back to, so that chlorinity in slurries be made to drop
It is low.This method is complicated for operation, the dangerous property of the hydrogen of release, and power consumption is big.
In conclusion the prior art still lacks a kind of prewashing device of dechlorination that can efficiently go out, it is de- for subsequent desulfurization
Nitre provides more supports, facilitates the integrated treatment of flue gas.
Utility model content
The utility model aim be in view of the drawbacks of the prior art, provide one kind can be reduced before flue gas desulfurization chlorine from
The prewashing device of sub- content, can be effectively reduced chloride ion content.The technical solution of the utility model is as follows.
A kind of prewashing device of flue gas dechlorination, prewashing tower including cylindrical body, the gas approach for being set to prewashing tower bottom
With the exhaust pass for being set to prewashing top of tower, the inner wall of the prewashing tower is fixedly installed spiral smoke deflector, institute
State the lower end of smoke deflector and the tangent connection in upper end of the gas approach, the upper end of the smoke deflector and the outlet
The tangent connection in the lower end of flue is provided with spray tube on the axis of the prewashing tower, is provided with from top to bottom on the spray tube
Several spray throwers, the spray thrower are set between every two layers of smoke deflector, the outlet connection of the spray thrower and circulating pump,
The entrance of the circulating pump is connect with the bottom of the prewashing tower, and the bottom of the prewashing tower and the outlet of dosing pump connect, institute
The entrance for stating dosing pump is connect with dispensing system, to supplement new spray liquid into tower.
Flue gas enters prewashing tower from gas approach, and by spray liquid spray process, exhaust pass is arranged in prewashing column overhead,
Prewashing treated flue gas is discharged, accesses subsequent processing system, such as desulfurizing tower.There are two main next for chloride ion in desulfurization slurry
Source: first is that forming chloride by burning containing chlorine in fire coal enters desulfurizing tower with flue gas, desulfurization slurry is entered under wet scrubbing；
Second is that bringing into process water, moisture evaporates in desulfurizing tower, and chloride ions accumulated is got off.In sweetening process, due to hydrogen chloride ratio
SO2Acid strong, 95% or more hydrogen chloride can be absorbed when desulfurization, and it is inevitable that chloride ion enters desulfurization slurry.Therefore, it is necessary to
Most of hydrogen chloride gas is just removed before flue gas enters desulfurizing tower, just can be reduced chloride ion content.The utility model is de-
Prewashing is carried out to flue gas before sulphur tower, it, can be with by 85% or more the hydrogen chloride gas with alkaline reaction absorbing and removing flue gas
Chloride ion content in slurries is reduced, the corrosion to material in tower is prevented, improves the quality of desulfuration byproduct.
Preferably, the gas approach is connect with prewashing tower angled downward from horizontal, the gas approach and the prewashing
Tilt angle between tower is greater than 10 degree less than 45 degree, to prevent in tower liquid reflux to flue.
Preferably, the bottom of the prewashing tower is connect with the entrance that slurries pump, the outlet of the slurries pump with it is dense
The connection of contracting evaporated crystallization device.Sprayed slurry useful slurries pump after sufficiently reacting with hydrogen chloride in flue gas is pumped to concentration and evaporation knot
Brilliant device produces byproduct, can obtain Nacl.Because hydrogen chloride can be dissolved in water and anti-with sodium hydroxide better than sulfur dioxide
It answers, so most hydrogen chloride can be removed by the prewashing system in flue gas, and the purity of sodium chloride can be relatively high in byproduct.
Preferably, spray thrower sprays spray liquid from tower center around, spray angles are not less than 60 degree, effectively spray away from
From greater than tower body radius.
Preferably, the spray liquid is sodium hydroxide solution.
Preferably, being fixedly installed several on the smoke deflector perpendicular to the turbulent flow plate on ground, the turbulent flow
Plate height is less than distance between every two layers of smoke deflector.The turbulent flow of gas and flowing can be increased in this way, promote gas-liquid exchange,
Increase the removal efficiency of chloride ion.
The beneficial effects of the utility model have:
(1) the utility model carries out prewashing to flue gas before desulfurizing tower, by with alkaline reaction absorbing and removing flue gas
85% or more hydrogen chloride gas, it is possible to reduce chloride ion content in slurries prevents the corrosion to material in tower, improves desulfurization pair
The quality of product；
(2) the utility model is provided with concentration and evaporation crystallization apparatus, and most hydrogen chloride can be by the prewashing system in flue gas
System removal, and the purity of sodium chloride can be relatively high in byproduct, can obtain high-quality Nacl.
(3) rationally, cost reduces for present apparatus design, can aid in popularization and application.
Detailed description of the invention
Fig. 1 present apparatus structural schematic diagram；
Appended drawing reference: prewashing tower 1, gas approach 2, exhaust pass 3, smoke deflector 4, spray tube 5, spray thrower 6, circulation
Pump 7, slurries pump 8, concentration and evaporation crystallization apparatus 9, dosing pump 10, dispensing system 11, turbulent flow plate 12.
Specific embodiment
Specific embodiment of the present utility model is described further with reference to the accompanying drawing:
A kind of prewashing device of flue gas dechlorination, as shown in Figure 1, prewashing tower 1 including cylindrical body is set to 1 bottom of prewashing tower
The gas approach 2 in portion and the exhaust pass 3 for being set to 1 top of prewashing tower, the inner wall of the prewashing tower 1 are fixedly installed spiral shape
Smoke deflector 4, the tangent connection in upper end of the lower end of the smoke deflector 4 and the gas approach 2, the flue gas water conservancy diversion
The tangent connection in lower end of the upper end of plate 4 and the exhaust pass 3 is provided with spray tube 5 on the axis of the prewashing tower 1, described
Several spray throwers 6 are provided on spray tube from top to bottom, the spray thrower 6 is set between every two layers of smoke deflector 4, described
Spray thrower 6 is connect with the outlet of circulating pump 7, and the entrance of the circulating pump 7 is connect with the bottom of the prewashing tower 1, the prewashing
The bottom of tower 1 is connect with the outlet of dosing pump 10, and the entrance of the dosing pump 10 is connect with dispensing system 11, to supplement into tower
New spray liquid.
Flue gas enters prewashing tower 1 from gas approach 2, and by spray liquid spray process, exhaust pass 3 is arranged in prewashing tower 1
Tower top, discharge prewashing treated flue gas, accesses subsequent processing system, such as desulfurizing tower.In desulfurization slurry there are two chloride ions
Main source: first is that forming chloride by burning containing chlorine in fire coal enters desulfurizing tower with flue gas, enter under wet scrubbing de-
Sulphur slurries；Second is that bringing into process water, moisture evaporates in desulfurizing tower, and chloride ions accumulated is got off.In sweetening process, due to chlorine
Change hydrogen ratio SO2Acid strong, 95% or more hydrogen chloride can be absorbed when desulfurization, and it is inevitable that chloride ion enters desulfurization slurry.Cause
This, it is necessary to most of hydrogen chloride gas is just removed before flue gas enters desulfurizing tower, just can be reduced chloride ion content.This is practical new
Type carries out prewashing to flue gas before desulfurizing tower, passes through 85% or more the hydrogen chloride gas with alkaline reaction absorbing and removing flue gas
Body, it is possible to reduce chloride ion content in slurries prevents the corrosion to material in tower, improves the quality of desulfuration byproduct.
As preferred embodiment, the gas approach 2 is connect with 1 angled downward from horizontal certain angle of prewashing tower, to prevent
Only in tower liquid reflux to flue.
As preferred embodiment, the bottom of the prewashing tower 1 is connect with the entrance of slurries pump 8, the slurries pump 8
Outlet connect with concentration and evaporation crystallization apparatus 9.Sprayed slurry useful slurries after sufficiently reacting with hydrogen chloride in flue gas pump pump
Byproduct is produced to concentration and evaporation crystallization apparatus, Nacl can be obtained.Because hydrogen chloride can be dissolved in water simultaneously better than sulfur dioxide
It is reacted with sodium hydroxide, so most hydrogen chloride can be removed by the prewashing system in flue gas, and sodium chloride in byproduct
Purity can be relatively high.
As preferred embodiment, spray thrower sprays spray liquid from tower center around, and spray angles are excellent not less than 60 degree
120 degree are selected, effectively spray distance is greater than tower body radius.
As preferred embodiment, the spray liquid is sodium hydroxide solution.
As preferred embodiment, several are fixedly installed on the smoke deflector 4 perpendicular to the turbulent flow plate on ground
12,12 height of turbulent flow plate is less than distance between every two layers of smoke deflector.The turbulent flow of gas and flowing can be increased in this way,
Promote gas-liquid exchange, increases the removal efficiency of chloride ion.
According to the disclosure and teachings of the above specification, the utility model those skilled in the art can also be to above-mentioned reality
The mode of applying is changed and is modified.Therefore, the utility model is not limited to specific embodiment disclosed and described above, right
Some modifications and changes of utility model should also be as falling into the protection scope of the claims of the present utility model.In addition, although
It is used some specific terms in this specification, these terms are merely for convenience of description, not to the utility model structure
At any restrictions.
Claims (6)
1. a kind of prewashing device of flue gas dechlorination, which is characterized in that prewashing tower including cylindrical body is set to prewashing tower bottom
Gas approach and the exhaust pass for being set to prewashing top of tower, the inner wall of the prewashing tower are fixedly installed spiral flue gas and lead
Flowing plate, the tangent connection in upper end of the lower end of the smoke deflector and the gas approach, the upper end of the smoke deflector with
The tangent connection in the lower end of the exhaust pass, is provided with spray tube on the axis of the prewashing tower, on the spray tube from upper and
Several spray throwers are arranged with, the spray thrower is set between every two layers of smoke deflector, the spray thrower and circulating pump
Outlet connection, the entrance of the circulating pump are connect with the bottom of the prewashing tower, the bottom of the prewashing tower and going out for dosing pump
Mouth connection, the entrance of the dosing pump is connect with dispensing system, to supplement new spray liquid into tower.
2. the prewashing device of flue gas dechlorination according to claim 1, which is characterized in that the gas approach and prewashing tower water
Flat to tilt down connection, the tilt angle between the gas approach and the prewashing tower is greater than 10 degree less than 45 degree, to prevent
Liquid reflux is to flue in tower.
3. the prewashing device of flue gas dechlorination according to claim 2, which is characterized in that the bottom of the prewashing tower and slurries
The entrance of pump connects, and the outlet of the slurries pump is connect with concentration and evaporation crystallization apparatus.
4. the prewashing device of flue gas according to claim 2 or 3 dechlorination, which is characterized in that spray thrower is from tower center to four
Spray spray liquid week, spray angles are not less than 60 degree, and effectively spray distance is greater than tower body radius.
5. the prewashing device of flue gas dechlorination according to claim 4, which is characterized in that the spray liquid is that sodium hydroxide is molten
Liquid.
6. the prewashing device of flue gas dechlorination according to claim 1 or 5, which is characterized in that solid on the smoke deflector
Surely several are provided with perpendicular to the turbulent flow plate on ground, the turbulent flow plate height is less than distance between every two layers of smoke deflector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821796132.XU CN209254479U (en) | 2018-11-01 | 2018-11-01 | A kind of prewashing device of flue gas dechlorination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821796132.XU CN209254479U (en) | 2018-11-01 | 2018-11-01 | A kind of prewashing device of flue gas dechlorination |
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| Publication Number | Publication Date |
|---|---|
| CN209254479U true CN209254479U (en) | 2019-08-16 |
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| CN201821796132.XU Active CN209254479U (en) | 2018-11-01 | 2018-11-01 | A kind of prewashing device of flue gas dechlorination |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112933912A (en) * | 2021-03-22 | 2021-06-11 | 广西九一动力科技有限公司 | Novel high-efficient spiral vortex marsh gas wet flue gas desulfurization device |
-
2018
- 2018-11-01 CN CN201821796132.XU patent/CN209254479U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112933912A (en) * | 2021-03-22 | 2021-06-11 | 广西九一动力科技有限公司 | Novel high-efficient spiral vortex marsh gas wet flue gas desulfurization device |
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