CN101816887A - High-alkaline double-alkali simplified desulfuration control method by adding agent at front end of canal - Google Patents
High-alkaline double-alkali simplified desulfuration control method by adding agent at front end of canal Download PDFInfo
- Publication number
- CN101816887A CN101816887A CN201010164753A CN201010164753A CN101816887A CN 101816887 A CN101816887 A CN 101816887A CN 201010164753 A CN201010164753 A CN 201010164753A CN 201010164753 A CN201010164753 A CN 201010164753A CN 101816887 A CN101816887 A CN 101816887A
- Authority
- CN
- China
- Prior art keywords
- naoh
- desulfuration
- alkali
- double
- simplified
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
A high-alkaline double-alkali simplified desulfuration control method by adding an agent at the front end of a canal belongs to the environmental protection technical field. The method comprises the following steps: a. infusing Ca(OH)2 solution at outlets of desulfurizing towers to fully mix with perturbed circulating liquid and perform a displacement reaction with Na2SO3 in the circulating liquid; and b. controlling and keeping the PH value of the circulating liquid at 9-10 in a high-alkaline condition by adjusting the infusion quantity of Ca(OH)2 solution so as to allow sufficient Ca(OH)2 to react with Na2SO3 and then fully displace NaOH. The method has the beneficial effects: the complex control process is simplified and loss caused by oxidation is basically avoided for NaOH so that double-alkali desulfuration process is more feasible and economical in reality, thus really achieving technical advantages of double-alkali desulfuration.
Description
Technical field
The invention belongs to environmental technology field.
Background technology
For double alkali method desulfurizing technology, though there are the standard techniques specification and requirement in country, does not have clear and definite concrete control procedure, the case of domestic double alkali method desulfurizing is many, but very successful is few, and the key of problem is that the process of double alkali method desulfurizing technology is difficult to control in actual use.
The process characteristic of double alkali method desulfurizing is: utilize the high advantage of NaOH desulfuration efficiency, earlier with NaOH with the SO in the flue gas
2Remove, but owing to NaOH costs an arm and a leg, so need use Ca (OH) again
2With NaOH from desulfurization product Na
2SO
3In cement out, allow NaOH realize using repeatedly, guarantee to realize to be economy purpose efficiently again with this.
Though this technology advantage is outstanding, course of reaction should not be controlled, and the parameter that changes in the process is many, and the variation of parameter is also big, so, how to determine and control NaOH and Ca (OH) according to the variation of parameter
2Injection rate just very difficult, injection rate is inaccurate, the efficientibility of double alkali method desulfurizing technology and energy saving technical advantage just are difficult to realize.
Summary of the invention
The objective of the invention is: provide a kind of water channel front end dosing high alkalinity double alkali method desulfurizing to simplify control method, it has realized the simplification of complicated control procedure, make double alkali method desulfurizing technology in reality, become more feasible, can really realize the technical advantage of double alkali method desulfurizing.
Method of the present invention is:
Inject Ca (OH) in the exit of each desulfurizing tower respectively
2Solution, it is fully mixed with circulation fluid in the circulation fluid of disturbance and with circulation fluid in Na
2SO
3Carry out displacement reaction.
Simplify control, only by adjusting Ca (OH)
2The injection rate of solution is controlled the acid-base value of circulation fluid, makes its pH value remain at high alkalinity state about 9-10, guarantees the Ca (OH) of capacity with this
2With Na
2SO
3React, displace NaOH fully.
The invention has the beneficial effects as follows: simplified complicated control procedure, guaranteed NaOH substantially, made double alkali method desulfurizing technology in reality, become more feasible, more economically, really realized the technical advantage of double alkali method desulfurizing not because of the oxidation loss.
Description of drawings
Fig. 1 is technological process of the present invention and control point diagram.
The specific embodiment
Embodiment 1
The technology emphasis of this method is exactly the loss of control NaOH in cyclic process and guarantees that all the time the NaOH of capacity participates in desulphurization reaction.
The loss of NaOH has two approach, and the one, be excluded desulfurization waste liquor and take away, the 2nd, be oxidized to desulfurization and receive (Na
2SO
4) and can't reduce.
First kind of loss of NaOH is unavoidable, because the desulfurization slag of discharging must contain certain amount of fluid.This loss needn't be controlled, and only needs to take in when calculating consumption.
Second kind of loss then must take measures to be controlled.Method has two aspects:
The one, inject Ca (OH)
2To try one's best near the outlet of desulfurizing tower (can inject in the exit of each tower respectively for many desulfurizing towers) in the position of solution, the recirculated water that itself and desulfurizing tower are got rid of mixes fully as far as possible, to guarantee that the NaOH in the recirculated water is fully cemented out, excellent (conventional method is to add Ca (OH) in the aeration tank to result of use in practice
2Solution, this method result of use in practice are not good).
The 2nd, the Ca (OH) that injects
2Want the theory demands amount of a little higher than displacement NaOH, this also is the necessary condition that guarantees that NaOH fully replaces.
How to determine Ca (OH)
2Injection rate? under the actual motion state, the demand of displacement NaOH can't directly be measured, usual way is to determine by the variation of the acid-base value that detects circulation fluid whether displacement is sufficient, and circulation fluid shows acid when flowing out behind the process desulphurization reaction in desulfurizing tower, add Ca (OH)
2At Na
2SO
3In become alkalescence, the Ca of adding (OH) after displacing NaOH
2Not enough, NaOH can not fully be replaced, the pH value of circulation fluid just deflection is neutral, just should be allowed the alkalescence of circulation fluid big so will guarantee NaOH by abundant displacement, and the situation of alkaline big appearance is nothing but to also have a spot of Ca (OH) when desulfurization except NaOH
2Participate in reaction, Ca (OH)
2Also be desulfurizing agent, only desulfuration efficiency is low slightly, and is little to total desulfuration efficiency influence.If desulfuration efficiency is obviously on the low side, can suitably reduce Ca (OH)
2Injection rate, improve the injection rate of NaOH efficient heightened.
According to above-mentioned analysis and practice result, the way that we take in actual engineering is: add Ca (OH) in the outlet of desulfurizing tower circulation fluid
2Solution fully mixes it and reserves the enough displacement reaction time before being incorporated in oxidation reaction with circulation fluid in the water channel that flows, the pH value of monitoring circulation fluid and by adjusting Ca (OH) in oxidation pond
2The injection rate of solution reaches about 9-10 it.Simultaneously, discharge the water yield that waste residue takes away (contain design concentration in the water be 10% NaOH) by measuring dreg removing system, can determine the number of dropouts of NaOH, by determining NaOH solution magnitude of recruitment, regularly NaOH solution is injected in the circulatory system again by regulating reservoir with same quantity of the water yield of discharging and identical concentration.
The aforesaid operations method is simplely can guarantee the characteristics that double alkali method desulfurizing efficient is high again.
Chemical reaction process
This programme adopts two alkaline process rotating stream tray scrubber desulfurization dust-removing techniques: its basic principles of chemistry can be divided into sweetening process and regenerative process, oxidizing process three parts:
A, sweetening process:
2NaOH+SO
2——→Na
2SO
3+H
2O (1)
Na
2SO
3+SO
2+H
2O——→2NaHSO
3 (2)
More than three formula apparent absorption liquid acid-base values different and different: alkaline when higher (PH＞9), (2) formula is key reaction; When alkalescence was low, (1) formula was key reaction; When alkalescence is neutral even acid (5＜PH＜9), then (3) formula is key reaction.
B, displacement regenerative process (milk of lime displacement regeneration):
2NaHSO
3+Ca(OH)
2——→Na
2SO
3+CaSO
31/2H
2O+3/2H
2O (4)
Na
2SO
3+Ca(OH)
2——→2NaOH+CaSO
31/2H
2O (5)
C, oxidation reaction (unsettled calcium sulfite oxidation becomes stable calcium sulfate):
2CaSO
3·1/2H
2O+O
2+3H
2O——→2CaSO
4·2H
2O
Ca(HSO
3)
2+1/2O
2+H
2O——→CaSO
4·H
2O+SO
2。
Claims (1)
1. a water channel front end dosing high alkalinity double alkali method desulfurizing is simplified control method, and its method is:
A, inject Ca (OH) in the exit of each desulfurizing tower respectively
2Solution, it is fully mixed with circulation fluid in the circulation fluid of disturbance and with circulation fluid in Na
2SO
3Carry out displacement reaction;
B, by adjusting Ca (OH)
2The injection rate of solution is controlled the acid-base value of circulation fluid, makes its pH value remain at the high alkalinity state of 9-10, guarantees the Ca (OH) of capacity with this
2With Na
2SO
3React, displace NaOH fully.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010164753A CN101816887A (en) | 2010-05-07 | 2010-05-07 | High-alkaline double-alkali simplified desulfuration control method by adding agent at front end of canal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010164753A CN101816887A (en) | 2010-05-07 | 2010-05-07 | High-alkaline double-alkali simplified desulfuration control method by adding agent at front end of canal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101816887A true CN101816887A (en) | 2010-09-01 |
Family
ID=42652253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010164753A Pending CN101816887A (en) | 2010-05-07 | 2010-05-07 | High-alkaline double-alkali simplified desulfuration control method by adding agent at front end of canal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101816887A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103657364A (en) * | 2012-09-14 | 2014-03-26 | 张家港市宏兴环保设备有限公司 | Dual-alkali flue gas desulphurization dust removal system |
| CN103691294A (en) * | 2013-11-25 | 2014-04-02 | 王中位 | Device and technology for wet-type double-alkali method-based desulphurization and dedusting |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1419952A (en) * | 2001-11-15 | 2003-05-28 | 陈鸣楼 | Double alkali wet desulfurizing dust-removing system |
| CN1475298A (en) * | 2003-07-10 | 2004-02-18 | 浙江大学 | Concentrated alkali double alkali method stack gas desulfurizing technology |
| CN1583230A (en) * | 2004-05-25 | 2005-02-23 | 浙江天蓝脱硫除尘有限公司 | Flue desulfuriznig and dust collecting induction and crystallization process for reuse by concentrated slurry double alkali method |
| CN101352641A (en) * | 2007-07-25 | 2009-01-28 | 上海智方环保工程有限公司 | Technique for reducing alkali loss in flue gas desulfurization by sodium-calcium dual-alkali scrubbing method |
| CN101502754A (en) * | 2009-02-09 | 2009-08-12 | 河南省泰隆科技开发应用有限公司 | Dual alkali desulphurization energy-saving technique |
| CN101596401A (en) * | 2009-06-03 | 2009-12-09 | 李鹏举 | Flue gas desulfurization by easy double alkali method technology and device |
-
2010
- 2010-05-07 CN CN201010164753A patent/CN101816887A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1419952A (en) * | 2001-11-15 | 2003-05-28 | 陈鸣楼 | Double alkali wet desulfurizing dust-removing system |
| CN1475298A (en) * | 2003-07-10 | 2004-02-18 | 浙江大学 | Concentrated alkali double alkali method stack gas desulfurizing technology |
| CN1583230A (en) * | 2004-05-25 | 2005-02-23 | 浙江天蓝脱硫除尘有限公司 | Flue desulfuriznig and dust collecting induction and crystallization process for reuse by concentrated slurry double alkali method |
| CN101352641A (en) * | 2007-07-25 | 2009-01-28 | 上海智方环保工程有限公司 | Technique for reducing alkali loss in flue gas desulfurization by sodium-calcium dual-alkali scrubbing method |
| CN101502754A (en) * | 2009-02-09 | 2009-08-12 | 河南省泰隆科技开发应用有限公司 | Dual alkali desulphurization energy-saving technique |
| CN101596401A (en) * | 2009-06-03 | 2009-12-09 | 李鹏举 | Flue gas desulfurization by easy double alkali method technology and device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103657364A (en) * | 2012-09-14 | 2014-03-26 | 张家港市宏兴环保设备有限公司 | Dual-alkali flue gas desulphurization dust removal system |
| CN103691294A (en) * | 2013-11-25 | 2014-04-02 | 王中位 | Device and technology for wet-type double-alkali method-based desulphurization and dedusting |
| CN103691294B (en) * | 2013-11-25 | 2016-04-06 | 王中位 | Wet type double alkali method desulfurizing dust arrester and technique |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101879406B (en) | Dual-alkali flue gas desulfurization device and desulfurization method | |
| CN103691274B (en) | A kind of method of producing regulation and control for Complexing Iron sulfur removal technology | |
| CN105457477A (en) | Sodium-calcium dual-alkali flue gas desulfurization method and system | |
| CN102166470A (en) | Dual-alkali smoke desulfurization device and desulfurization method thereof | |
| CN102101005B (en) | Method for treating sulfur dioxide smoke by using steel slag | |
| CN103191637A (en) | Industrial exhaust gas desulfurizer | |
| CN101347706A (en) | Flue gas desulfurization technique using dual alkali method with acetylene sludge as recycling agent | |
| CN103492045A (en) | Wet desulfurization apparatus and method for operating said wet desulfurization apparatus | |
| CN102284239A (en) | Desulfurization process and device based on out-of-tower circulation and independent oxidization dual-alkali methods | |
| CN103113930A (en) | Method and equipment for improving desulfurization efficiency of coke oven gas by vacuum potassium carbonate method | |
| CN102847423B (en) | Catalytic double-alkali desulphurization and dust removal process | |
| CN103113928B (en) | Optimization process of vacuum potassium carbonate method coke oven gas desulfurization and equipment thereof | |
| CN101352641A (en) | Technique for reducing alkali loss in flue gas desulfurization by sodium-calcium dual-alkali scrubbing method | |
| CN209287031U (en) | A kind of sulfur dioxide minimum discharge desulfurizer being bubbled combination tower based on spray | |
| CN101816887A (en) | High-alkaline double-alkali simplified desulfuration control method by adding agent at front end of canal | |
| CN202962254U (en) | Device for purifying harmful substances in smoke generated during boiler combustion | |
| CN201791461U (en) | Dual-alkali flue gas desulfurization equipment | |
| CN106731557A (en) | Absorbing liquid circulation utilization method and system during a kind of denitrating flue gas | |
| CN102120135B (en) | Method and device for synchronously removing H2S, CO2 and SO2 from sulfur-containing mixed gas | |
| CN201990643U (en) | Device for simultaneously removing H2S, CO2 and SO2 in sulfur-containing mixed gas | |
| CN201214046Y (en) | Ammonia process desulphurizing device for reducing ammonia escape | |
| CN204865538U (en) | Flue gas desulphurization device and flue gas integration SOx/NOx control system | |
| CN201578988U (en) | Double circulation double alkali method flue gas desulfurization device | |
| CN103849437A (en) | Process and device for vacuum desulfurization of potash | |
| CN102423617A (en) | Method of preventing scaling of desulphurization equipment and pipelines used in dual-alkali desulphurization process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100901 |