CN1137760C - Pre-treating process for regenerating sodium hydroxide as desulfurizing agent by electrolysis - Google Patents
Pre-treating process for regenerating sodium hydroxide as desulfurizing agent by electrolysis Download PDFInfo
- Publication number
- CN1137760C CN1137760C CNB001308505A CN00130850A CN1137760C CN 1137760 C CN1137760 C CN 1137760C CN B001308505 A CNB001308505 A CN B001308505A CN 00130850 A CN00130850 A CN 00130850A CN 1137760 C CN1137760 C CN 1137760C
- Authority
- CN
- China
- Prior art keywords
- sodium
- desulfurization
- electrolysis
- regenerating
- waste water
- 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.)
- Expired - Fee Related
Links
Landscapes
- Water Treatment By Electricity Or Magnetism (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to a pretreatment method for electrolyzing and regenerating a sodium hydroxide desulfurizing agent, which comprises the following steps: leading waste water containing sodium sulfite and sodium bisulfite after being desurfurized by a flue gas desulfurization process into an air aerator to carry out aeration; oxidizing the sodium sulfite and the sodium bisulfite in the waste water into sodium sulfate and sodium bisulfate; then, leading the desurfurized waste water after being aerated into an electrolyzing and regenerating process of the desulfurizing agent to electrolyze. The present invention organically combines a desulfurating and washing process and the electrolyzing and regenerating process. Thus, an entire desulfurating system is easy to control and operate and is stable and reliable; a byproduct economic value is high.
Description
Technical Field
The invention relates to an oxidation treatment method, in particular to a method for organically linking two processes of flue gas desulfurization washing and desulfurizer electrolysis regeneration so as to improve the stability and efficiency of the process.
Background
With the continuous development of domestic and foreign industrial economy, the discharge amount of sulfur dioxide is continuously increased, and the pollution of the sulfur dioxide and acid rain caused by the sulfur dioxide to the atmosphere is more and more serious. The main pollution sources of sulfur dioxide come from boilers, kilns and the like. In the treatment of sulfur dioxide pollution, various countries have adopted a number of different desulfurization techniques, including limestone-gypsum process, electron beam process, spray drying process, in-furnace calcium injection, coal washing, etc. However, these methods have the disadvantages of low desulfurization efficiency, large primary investment, high operation cost, secondary pollution and the like, so that the power plants installed with desulfurization equipment in China to date have a few. To this end, new economically viable desulfurization technologies have been explored and developed. One of the new desulfurization techniques is a method of desulfurizing desulfurization waste water by using a solution containing NaOH as a desulfurizing agent and then carrying out electrolytic regeneration on the desulfurization waste water. Although the method is feasible, if the desulfurization wastewater is directly electrolyzed, the electrolysis process is difficult to control due to the instability of sodium sulfite and sodium bisulfite, and the anode gas after electrolysis is difficult to recycle. Therefore, how to overcome the above problems, effectively linking the desulfurized wastewater with the electrolysis process, and fully playing the advantages of the desulfurization washing process and the electrolysis process is the key to effective popularization and application of the electrolysis regeneration desulfurization technology.
Disclosure of Invention
The invention aims to provide a pretreatment method for electrolyzing and regenerating a sodium hydroxide desulfurizer, so that a desulfurization washing process and an electrolysis regeneration process are organically linked, a whole desulfurization system is easier to control and operate, more stable and reliable, and a byproduct has higher economic value.
In order to achieve the purpose, the invention provides a pretreatment method for electrolytically regenerating a sodium hydroxide desulfurizer, which comprises the steps of introducing wastewater containing sodium sulfite and sodium bisulfite after desulfurization by a flue gas desulfurization process into an air aeration device for aeration, so that the sodium sulfite and the sodium bisulfite in the wastewater are oxidized into sodium sulfate and sodium bisulfate, and then introducing the aerated desulfurization wastewater into an electrolytic regeneration process of the desulfurizer for electrolysis.
The invention effectively solves the problems in the prior art. Aiming at the problems of the prior method for directly carrying out electrolytic regeneration on desulfurization wastewater after desulfurization by using a solution containing NaOH as a desulfurizing agent, the invention arranges an intermediate process between the two processes, so that the two processes can be organically combined. Because the desulfurized sodium sulfite or sodium bisulfite is aerated and oxidized into sodium sulfate and sodium bisulfate by air and then is electrolyzed, and because the chemical stability of the aerated sodium sulfate and sodium bisulfate is better than that of the sodium sulfite and sodium bisulfite, the electrolysis process is easier to control, more stable, more convenient and more reliable. The electrolysis efficiency and stability are greatly improved compared with the direct electrolysis of sodium sulfite and sodium bisulfite, and meanwhile, the byproduct oxygen is added in the electrolysis byproducts, thereby improving the economy of the whole desulfurization system.
Detailed Description
The invention will now be described in more detail with reference to a preferred embodiment.
The pretreatment method for the electrolytic regeneration of the sodium hydroxide desulfurizer is characterized in that an intermediate process for carrying out air aeration on the wastewater containing sodium sulfite and sodium bisulfite after desulfurization is arranged between a flue gas desulfurization process and a desulfurization wastewater electrolytic regeneration process, wherein the flue gas desulfurization process is a wet desulfurization process, and the desulfurizer used in the process is NaOH solution. The desulfurization waste water desulfurized by the desulfurization process mainly contains sodium sulfite and sodium bisulfite, wherein the sodium sulfate is about 20 percent, and the sodium sulfite is about 3 percent. The key point of the invention is that the desulfurization waste water containing sodium sulfite and sodium bisulfite is led into an air aerator to cause the oxygen in the air and the sodium sulfite and sodium bisulfite in the desulfurization waste water to react as follows:
the aeration process is completed in a short time, and the desulfurization waste water can be aerated only by flowing through an aerator. The aeration should be sufficient, and the smaller the residual amount of sodium sulfite and sodium bisulfite after aeration is, the better. The recommended residual sodium sulfite and sodium bisulfite is less than 5% of the total amount of sodium orthosulfite and sodium bisulfite. In this example, the residual amount of sodium sulfite after aeration was less than 0.1%.
The aeration can adopt any air aeration equipment or air aeration mode. Different aeration equipment and modes will affect initial investment, operating cost, aeration degree, etc.
The aerated desulfurization waste water can be introduced into an electrolytic bath for electrolyzing and regenerating a desulfurizer after the procedures of filtering, impurity ion separation, temperature regulation and the like are carried out according to the requirements of an electrolytic process.
Claims (1)
1. A pretreatment method for electrolyzing and regenerating a sodium hydroxide desulfurizer is characterized in that wastewater containing sodium sulfite and sodium bisulfite after desulfurization by a flue gas desulfurization process is introduced into an air aeration device for aeration, so that the sodium sulfite and the sodium bisulfite in the wastewater are oxidized into sodium sulfate and sodiumbisulfate, and then the aerated desulfurization wastewater is introduced into a desulfurizer electrolysis regeneration process for electrolysis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001308505A CN1137760C (en) | 2000-12-14 | 2000-12-14 | Pre-treating process for regenerating sodium hydroxide as desulfurizing agent by electrolysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001308505A CN1137760C (en) | 2000-12-14 | 2000-12-14 | Pre-treating process for regenerating sodium hydroxide as desulfurizing agent by electrolysis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1302685A CN1302685A (en) | 2001-07-11 |
| CN1137760C true CN1137760C (en) | 2004-02-11 |
Family
ID=4594354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001308505A Expired - Fee Related CN1137760C (en) | 2000-12-14 | 2000-12-14 | Pre-treating process for regenerating sodium hydroxide as desulfurizing agent by electrolysis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1137760C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101347712B (en) * | 2008-08-21 | 2011-12-07 | 浙江菲达环保科技股份有限公司 | Novel sodium-method desulfurizing tower |
| CN104150569B (en) * | 2014-08-20 | 2016-11-16 | 成都飞创科技有限公司 | A kind of method and device of the desulfurization wastewater after treatment and purification |
-
2000
- 2000-12-14 CN CNB001308505A patent/CN1137760C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1302685A (en) | 2001-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102101010B (en) | Electrolysis circulating flue gas desulfurization method utilizing reclamation semidry method | |
| CN111924807A (en) | Method and device for trapping carbon dioxide and simultaneously producing sulfuric acid by sodium bisulfate | |
| CN111377575A (en) | Treatment method of high-sulfate high-COD organic wastewater | |
| CN103007718B (en) | Wet redox, desulfuration and resource utilization method for flue gas | |
| CN106381183A (en) | Biological desulfurization device and desulfurization process for biogas | |
| CN105132040A (en) | Yellow phosphorus tail gas purification method and system | |
| CN103769407A (en) | Regeneration method for sulphureous alkali residues | |
| CN102949924B (en) | Method for applying petrochemical exhausted lye to semidry-method flue gas desulfurization | |
| CN112320818A (en) | Method for oxidizing sulfite in flue gas desulfurization slurry | |
| CN1137760C (en) | Pre-treating process for regenerating sodium hydroxide as desulfurizing agent by electrolysis | |
| CN1339332A (en) | Sulphur dioxide removing electrolysis process | |
| CN112619372A (en) | Novel calcination tail gas desulfurization method | |
| CN115745266A (en) | System and method for treating high-calcium high-salt wastewater by capturing carbon dioxide in smelting plant flue gas | |
| CN205710313U (en) | A kind of wiring board alkali etching ammonia nitrogen wastewater treatment device | |
| CN1351898A (en) | Process for treating waste gas containing SO2 | |
| CN212669628U (en) | Biological fine desulfurization treatment system for biogas | |
| CN1243598C (en) | Waste gas desulfurizing method and apparatus | |
| CN104607435B (en) | A kind of comprehensive processing method of sulfur-bearing alkaline residue | |
| CN102815812B (en) | Optimization process method for recovering sodium sulfate form ethylene waste alkali | |
| CN1248770C (en) | Desulfurizing process and equipment able to regenerates sulfurizing agent | |
| CN112473344A (en) | Biological desulfurization system without aeration and treatment method | |
| CN113213433A (en) | Method for directly preparing sulfuric acid for storage battery by using secondary lead smelting flue gas | |
| CN1391975A (en) | Method for controlling flue gas contaiing SO2 with NaCl and producing high concentratino SO2 | |
| CN106007112A (en) | High-concentration coal gasification wastewater treatment method and system | |
| CN205740599U (en) | A kind of high-concentration coal gasification waste water processing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHEN KELEIEN BLUE-SKY TECHNOLOGY CO., LTD Free format text: FORMER OWNER: SHENZHEN KELEIEN ENVIRONMENTAL TECHNOLOGY CO., LTD Effective date: 20030328 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20030328 Address after: 518026 Guangdong city of Shenzhen province Futian District CaiTian deep South Garden A block, 1901 Applicant after: Shenzhen Kelein Lantian Technology Co., Ltd. Address before: 518026 Guangdong city of Shenzhen province Futian District CaiTian deep South Garden A block, 1901 Applicant before: Keleien Environment Science and Technology Co Ltd, Shenzhen City |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Shen Yiyong Document name: Notice of conformity |
|
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Shen Yiyong Document name: payment instructions |
|
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Hao Chuanxin Document name: Notification of Passing Examination on Formalities |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040211 Termination date: 20131214 |