CN102302895A - Purification method of sulfur dioxide tail gas - Google Patents
Purification method of sulfur dioxide tail gas Download PDFInfo
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- CN102302895A CN102302895A CN201110222326A CN201110222326A CN102302895A CN 102302895 A CN102302895 A CN 102302895A CN 201110222326 A CN201110222326 A CN 201110222326A CN 201110222326 A CN201110222326 A CN 201110222326A CN 102302895 A CN102302895 A CN 102302895A
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- tail
- tail gas
- tower
- absorption
- purification method
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Abstract
The invention provides a purification method of a sulfur dioxide tail gas and relates to a purification method of a tail gas containing sulfur dioxide smoke. The purification method comprises the following steps: a, because the concentration of SO2 in the tail gas entering a device is relatively low and is about 1000-1500mg/Nm<3>, arranging a one-stage tail gas absorption tower for desulfuration in a project, wherein the tail gas absorption tower performs absorption by adopting countercurrent, forward current and rotational flow modes, a sulfuric acid tail gas containing SO2 enters the tail gas absorption tower from the outlet of a secondary absorption tower, and the concentration of SO2 is 1000-1500mg/Nm<3>; b, carrying out at least two-stage absorption on the tail gas in the tail gas absorption tower; and c, catching liquid drop from the purified gas obtained after washing and absorbing twice through a mist eliminating layer in the tail gas absorption tower, and then introducing the tail gas into a tail gas chimney from the top of the tail gas absorption tower for evacuation. According to the invention, the countercurrent, forward current and rotational flow modes are adopted in the purification method, thus the absorption rate of SO2 is improved, investment is less and benefit is good.
Description
Technical field
The present invention relates to a kind of exhaust purifying method, particularly contain the exhaust purifying method of sulfur dioxide flue gas.
Background technology
Adopt the general employing of sulphur-burning sulphuric acid plant to burn combustion of sulfur, be 3+2 double-absorption (three towers, two grooves) flow process at present; Designed productive capacity is 200kt/a; In June, 2002, production capacity after technological transformation reached 270kt/a; After transform and optimization; Production capacity reaches about 300kt/a; In recent years; Subject matter around device exists has been done many work; Like the main air blower transformation, improve the catalyst filling amount, driedly suck back sour mode and change into and intersects back acid, the suitable reduction of load etc.; Conversion ratio has been brought up to about 99.7% tail gas SO from 99.3%
2Discharge capacity still exceeds discharging standards, and the environment of periphery is caused influence to a certain degree.
Goal of the invention
The object of the invention is intended to overcome the defective of prior art, provides a kind of and absorbs SO with the ammonia fertilizer method
2, the weak aqua ammonia that utilizes synthetic ammonia installation to produce absorbs SO
2, tail gas absorbs the sulphur ammonium liquid of generation after concentrating, the purification method of the SO 2 tail gas of phosphorus supply ammonium, composite fertilizer's production usefulness.
The purification method of SO 2 tail gas of the present invention, it is realized by following steps:
A. owing to advance the tail gas SO of this device
2Concentration is lower, about 1000～1500mg/Nm
3, this engineering is provided with the one-level tail and inhales the tower desulfurization, and tail is inhaled tower and is adopted adverse current, following current, eddy flow to absorb,
Contain SO
2Sulfuric acid tail gas inhale the towers outlet from two and get into tails and inhale towers, SO
2Concentration is 1000～1500mg/Nm
3
B. tail gas warp two-stage absorption at least in tail is inhaled tower: one-level absorbs and is located in the tail suction tower flue gas inlet tube, takes to wash along spraying absorption pattern, and spray flux is 200M
3/ h; Secondary absorbs and is located in the tail suction tower, and the tail gas that absorbs through one-level tangentially gets into tail suction tower, and behind the formation eddy flow, in tail is inhaled tower, being provided with at least 4 spray flux on the same plane is 50m
3The shower nozzle of/h, tail gas and absorption liquid carry out reverse absorption and washing;
C. the Purge gas that absorbs through twice washing after foam-removing layer is caught drop in the tail suction tower, is inhaled column overhead by tail and is got into the tail gas funnel emptying.
It is tower groove integral structure that step a, b, the said tail of c are inhaled tower.Shower nozzle adopts the large aperture fluid jetting head, and resistance is little and for open type design, difficult obstruction.The present invention compares with traditional void tower, foaming tower and packed tower, and device structure is simpler, and purification efficiency is more excellent, particularly under tolerance, the dense astable working condition of gas, has more reliable and more stable operating characteristics than legacy equipment.
Tail is inhaled tower SO in tower
2The control index of pH value, two keys of density of absorptivity and absorption liquid relevant, and these two parameters with advance tower tail gas amount, exhaust temperature, SO
2Parameters such as concentration, absorption liquid temperature, ammonia concn, ammoniacal liquor addition, string liquid measure are closely related, can detect above-mentioned data according to the industry common method, inhale tower SO in tower to confirm tail
2Absorptivity and the pH value and the density of absorption liquid.
For reaching controlling of production process index preferably, this engineering is considered configuration relevant detection and control instrument, and whole desulfurizer is controlled accurately automatically.Particularly key parameters such as the absorption liquid pH value that influences absorptivity and density are carried out full-automation control; Inhale pH value, mother liquor density, ammoniacal liquor and the fresh water (FW) of circulating absorption solution in the tower through the control tail and mend into amount, whole desulfurizer is efficient to reach, the purpose of operation steady in a long-term.
The principle of absorption that tail is inhaled tower is: utilize tail to inhale the tower inlet tube as turbulent flow following current uptake zone, flue gas contacts with the absorption liquid collision, has formed continual high turbulent area, the SO in liquid foam face gas
2Get into liquid,, thereby deviate from the absorbent reaction in the liquid.
Gas-liquid mixture after the absorption tangentially gets into tower body, forms eddy flow, in uphill process, forms contrary spray with shower nozzle in the absorption tower and absorbs, and at the bottom of circulation fluid natural subsidence to the tower, absorption circulates after the circulating pump pressurization.And Purge gas gets into smoke stack emission through tower body top demister.
Carry out following two courses of reaction in absorption process:
(1) absorption process:
Absorption process is mainly carried out in tail is inhaled the tower reverse jet tube, and the flue gas that contains sulfur dioxide fully contacts with absorption liquid, and reacts by following reaction equation:
SO
2?+?H
2O
?H
2SO
3
H
2SO
3?+(NH
4)
2SO
3 
?2NH
4HSO
3
(2) regenerative process:
Regenerative process is mainly carried out in tail is inhaled the Tata groove, for keeping (NH in the absorption liquid
4)
2SO
3/ NH
4HSO
3Than value stabilization, add ammoniacal liquor in the absorption cell and press the following formula reaction, make the absorption liquid partial regeneration:
NH
4HSO
3＋NH
4OH?
?(NH
4)
2SO
3＋H
2O
Gas-liquid mixture after the absorption gets into tower body from reverse jet tube, because the gas prompt drop is low, drop falls into the bottom cell body, and absorption liquid returns contrary shower nozzle through circulating pump, and absorption circulates.And Purge gas gets into smoke stack emission through tower body top demister.
Flue gas is after ammonia process absorbs, and its sulfur dioxide total absorptivity is not less than 80%, SO in the flue
2Concentration is no more than 200mg/Nm
3Flue gas after being purified is by 100 meters smoke stack emissions.Tail is inhaled the tower section absorption liquid and is reached set quota, send 800,000 tons of sulfuric acid/a device to concentrate, and supplies downstream to use.
The present invention adopts the mode along spray, contrary spray, eddy flow, improves SO
2Absorptivity, absorb with ammonia process at present commonly used and to compare, have following characteristics: (1) SO
2Absorption pattern following current, the contrary spray mode of eddy flow, thus SO improved
2Absorptivity; (2) utilize inlet tube as the one-level uptake zone, minimizing equipment has been practiced thrift investment cost; (3) absorption tower collection secondary absorption, circulation fluid container are one, compact conformation; Through above optimal design, investment cost only be 1/3rd of present ammonia process absorption, has reached the mentality of designing of small investment, high efficiency.
Exhaust gas treating method of the present invention contains SO
2Sulfuric acid tail gas inhale the towers outlet from two and get into newly-increased tail and inhale tower, the drop after the absorption falls into the bottom cell body, absorption liquid carries out circulation cleaning through tail imbibition circulating pump and absorbs.In tail is inhaled tower, add the discarded weak aqua ammonia control absorption liquid concentration of concentration about 80tt, when absorption liquid concentration reaches 1.13～1.16kg/l, pH value 4～6, partially absorb liquid and deliver to by tail imbibition delivery pump and carry out oxidation in the oxidizing tower.SO in the tail gas after the ammonia fertilizer method absorbs
2Concentration is no more than 400mg/Nm
3, by the tail gas funnel discharging, the condensate liquid of chimney bottom returns tail and inhales in the tower.Put into operation on the January 18th, 2011 that is installed on that it is supporting, and through debugging, tail is inhaled tower outlet SO
2Concentration obtains stable control, and the discharge capacity basic controlling is at 350-400 mg/Nm
3, tail is inhaled the tower absorptivity only to be had about 65%.Differ more with design, because tail is inhaled due to the interior leakage of shortcut tube valve, on March 30th, 2011, after the shortcut valve was installed blind plate, the absorptivity that tail is inhaled tower was improved, and surpassed the technological transformation absorptivity and reached 78% desired value, tail gas SO through searching former
2Content is less than 100mg/Nm
3Concrete data see the following form
Description of drawings
Fig. 1 is a schematic flow sheet of the present invention.
The specific embodiment
The purification method of SO 2 tail gas of the present invention, it is realized by following steps:
A. contain SO
2Sulfuric acid tail gas inhale the towers outlet from two and get into tails and inhale towers, SO
2Concentration is 1000～1500mg/Nm
3If the tail gas SO that gets into
2Concentration is lower, and then the present invention can only adopt the one-level tail to inhale the tower desulfurization, and tail is inhaled tower and adopted adverse current, following current, eddy flow to absorb, forms such as tail gas absorber foam tower, packed tower, void tower, and material is selected structures such as carbon steel lining brick, lead, fiberglass for use.
B. tail gas warp two-stage absorption at least in tail is inhaled tower: one-level absorbs and is located in the tail suction tower flue gas inlet tube, takes to wash along spraying absorption pattern, and spray flux is 200M
3/ h; Secondary absorbs and is located in the tail suction tower, and the tail gas that absorbs through one-level tangentially gets into tail suction tower, and behind the formation eddy flow, in tail is inhaled tower, being provided with at least 4 spray flux on the same plane is 50m
3The shower nozzle of/h, tail gas and absorption liquid carry out reverse absorption and washing.
C. the Purge gas that absorbs through twice washing after foam-removing layer is caught drop in the tail suction tower, is inhaled column overhead by tail and is got into the tail gas funnel emptying.
It is tower groove integral structure that step a, b, the said tail of c are inhaled tower.Shower nozzle adopts the large aperture fluid jetting head, and resistance is little and for open type design, difficult obstruction.The present invention compares with traditional void tower, foaming tower and packed tower, and device structure is simpler, and purification efficiency is more excellent, particularly under tolerance, the dense astable working condition of gas, has more reliable and more stable operating characteristics than legacy equipment.
Tail is inhaled tower SO in tower
2The control index of pH value, two keys of density of absorptivity and absorption liquid relevant, and these two parameters with advance tower tail gas amount, exhaust temperature, SO
2Parameters such as concentration, absorption liquid temperature, ammonia concn, ammoniacal liquor addition, string liquid measure are closely related, can detect above-mentioned data according to the industry common method, inhale tower SO in tower to confirm tail
2Absorptivity and the pH value and the density of absorption liquid.
For reaching controlling of production process index preferably, this engineering is considered configuration relevant detection and control instrument, and whole desulfurizer is controlled accurately automatically.Particularly key parameters such as the absorption liquid pH value that influences absorptivity and density are carried out full-automation control; Inhale pH value, mother liquor density, ammoniacal liquor and the fresh water (FW) of circulating absorption solution in the tower through the control tail and mend into amount, whole desulfurizer is efficient to reach, the purpose of operation steady in a long-term.
Claims (4)
1. the purification method of a SO 2 tail gas is characterized in that, it is realized by following steps:
The sulfuric acid tail gas that a. will contain SO2 gets into tail from two suction tower outlets and inhales tower, and SO2 concentration is 1000～1500mg/Nm3;
B. tail gas warp two-stage absorption at least in tail is inhaled tower: one-level absorbs and is located in the tail suction tower flue gas inlet tube, takes to wash along spraying absorption pattern, and spray flux is 150-250M
3/ h; Secondary absorbs and is located in the tail suction tower, and the tail gas that absorbs through one-level tangentially gets into tail suction tower, and behind the formation eddy flow, in tail is inhaled tower, being provided with at least 4 spray flux on the same plane is 30-70m
3The shower nozzle of/h, tail gas and absorption liquid carry out reverse absorption and washing;
C. the Purge gas that absorbs through twice washing after foam-removing layer is caught drop in the tail suction tower, is inhaled column overhead by tail and is got into the tail gas funnel emptying.
2. the purification method of SO 2 tail gas according to claim 1 is characterized in that, it is tower groove integral structure that step a, b, the said tail of c are inhaled tower.
3. the purification method of SO 2 tail gas according to claim 1 is characterized in that, absorption liquid pH value, the density that shower nozzle sprays is carried out full-automation control.
4. the purification method of SO 2 tail gas according to claim 1 is characterized in that, tail is inhaled tower and adopted adverse current, following current, eddy flow to absorb.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110222326A CN102302895A (en) | 2011-08-04 | 2011-08-04 | Purification method of sulfur dioxide tail gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110222326A CN102302895A (en) | 2011-08-04 | 2011-08-04 | Purification method of sulfur dioxide tail gas |
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| Publication Number | Publication Date |
|---|---|
| CN102302895A true CN102302895A (en) | 2012-01-04 |
Family
ID=45376865
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|---|---|---|---|
| CN201110222326A Pending CN102302895A (en) | 2011-08-04 | 2011-08-04 | Purification method of sulfur dioxide tail gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103552992A (en) * | 2013-10-30 | 2014-02-05 | 中石化南京工程有限公司 | System and method for preparing acid by using sulfur-containing wastewater through dry method |
| CN104826474A (en) * | 2015-05-06 | 2015-08-12 | 云南云天化股份有限公司 | Processing method of tail gas of diammonium phosphate production device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101130152A (en) * | 2007-08-14 | 2008-02-27 | 湖南大学 | Injecting, bubbling ,dust settling, desulfurating and absorbing tower with vertical screen deck |
| CN101530726A (en) * | 2008-04-11 | 2009-09-16 | 玛纳斯澳洋科技有限责任公司 | Method for processing waste gas from the production of viscose chemical fiber |
-
2011
- 2011-08-04 CN CN201110222326A patent/CN102302895A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101130152A (en) * | 2007-08-14 | 2008-02-27 | 湖南大学 | Injecting, bubbling ,dust settling, desulfurating and absorbing tower with vertical screen deck |
| CN101530726A (en) * | 2008-04-11 | 2009-09-16 | 玛纳斯澳洋科技有限责任公司 | Method for processing waste gas from the production of viscose chemical fiber |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103552992A (en) * | 2013-10-30 | 2014-02-05 | 中石化南京工程有限公司 | System and method for preparing acid by using sulfur-containing wastewater through dry method |
| CN104826474A (en) * | 2015-05-06 | 2015-08-12 | 云南云天化股份有限公司 | Processing method of tail gas of diammonium phosphate production device |
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Application publication date: 20120104 |