CN1382515A - Electrolyzing process and equipment for desulfurizing sodium chloride - Google Patents
Electrolyzing process and equipment for desulfurizing sodium chloride Download PDFInfo
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- CN1382515A CN1382515A CN 01115416 CN01115416A CN1382515A CN 1382515 A CN1382515 A CN 1382515A CN 01115416 CN01115416 CN 01115416 CN 01115416 A CN01115416 A CN 01115416A CN 1382515 A CN1382515 A CN 1382515A
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- desulfurization
- sodium chloride
- electrolytic cell
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Abstract
A desulfurizing process and apparatus features that the solution of sodium chloride is electrolyzed to generate sodium hydroxide used as desulfurizing agent. Its advantages are high desulfurizing efficiency and no secondary pollution.
Description
The invention relates to a desulfurization method and a desulfurization device for removing sulfur dioxide in waste gas, in particular to a desulfurization method and a desulfurization device for producing sodium hydroxide as a desulfurizing agent by utilizing electrolysis of sodium chloride.
The exhaust gas exhausted from boilers and kilns commonly used in the industries of electric power, chemical industry, metallurgy and the like contains a large amount of sulfur dioxide, which causes serious pollution to the atmosphere and is a main pollutionsource formed by acid rain. At present, the research of flue gas desulfurization is actively developed at home and abroad, certain progress is made, and some desulfurization technologies and processes are applied and popularized in practical engineering. For example, the most commonly used lime/limestone-gypsum method utilizes the characteristic that lime or limestone can react with sulfur dioxide to perform wet desulfurization and washing on flue gas, thereby achieving the purpose of purifying the flue gas; there are other methods such as spray drying, electron beam, ammonia, and the like. However, the methods have the disadvantages that the final desulfurization by-product of the lime/limestone-gypsum method is gypsum which is restricted by the process and the market, cannot be commercialized and only occupies land to discard and stack, thus forming secondary pollution; in the method for regenerating the desulfurizer by electrolyzing sodium sulfate mentioned in some foreign documents, a large amount of by-product dilute sulfuric acid is difficult to treat, and the cost for purifying to commercial concentrated sulfuric acid is high. In other desulfurization process methods, some methods have high initial investment, some methods have high operation cost, some methods form secondary pollution, and some methods have low desulfurization efficiency. These disadvantages have largely restricted the development of the desulfurization environmental protection industry.
The invention aims to provide a desulfurization method using sodium hydroxide generated by sodium chloride electrolysis as a desulfurizing agent, which has the advantages of low investment, low operation cost, high desulfurization efficiency and no secondary pollution.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a sodium chloride electrolytic desulfurization method comprises the following steps:
(A) electrolyzing the sodium chloride solution to generate sodium hydroxide;
(B) using solution with sodium hydroxide as a main component as a desulfurizer to wash and desulfurize the waste gas;
the device for realizing the method comprises the following steps:
at least one desulfurization scrubber 1;
at least one-membrane double-chamber cation membrane electrolytic cell 2, wherein the cathode chamber of the electrolytic cell 2 is connected with a desulfurization washing tower 1 through a conduit 3;
the top of the desulfurization washing tower is provided with at least one gas outlet pipe 4, and the bottom of the desulfurization washing tower is provided with at least one gas pipeline 5 to be treated.
The anode chamber of the electrolytic cell 2 is provided with a hydrogen delivery pipe 6, and the cathode chamber is provided with a chlorine delivery pipe 7.
By adopting the method and the device, the whole desulfurization process does not generate solid waste and secondary pollution, byproducts are high-purity hydrogen and chlorine, and can be processed into various downstream products, so that the market demand is large, and the commercial value is high; in addition, the high-concentration NaOH solution generated by electrolyzing the NaCl solution is used as a desulfurizer for desulfurization, and the desulfurization efficiency is far higher than that of other common desulfurizers; the initial investment is relatively low; in the occasions with low electricity price, such as power station desulfurization occasions, the desulfurization operation cost is greatly lower than that of the prior common desulfurization process and method after the sales income of byproducts is deducted; in addition, it avoids the disadvantage of producing large amounts of dilute sulfuric acid which is difficult to handle in conventional sodium sulfate electrolytic regeneration processes.
FIG. 1 is a flow chart of the apparatus of the present invention.
The invention is explained in more detail below with reference to the figures and examples:
the sodium chloride electrolytic desulfurization method comprises the following steps:
as shown in FIG. 1, a concentrated NaCl solution is introduced into the anode chamber of the cation membrane electrolyzer 2 to be electrolyzed. Whether the NaCl solution before introduction needs to be refined and to what extent will be determined specifically depending on the conditions such as the choice of ionic membrane, the planned membrane replacement period, the extent to which the user is subjected to increased operating costs, etc., which affect the economic indicators of the operation of the desulfurization system, but have no substantial effect on the principle of the present invention. Generally, the higher the degree of purification, the longer the service life of the ionic membrane, but the higher the running cost of the purified part. The cation membrane electrolytic cell is an ion membrane electrolytic cell commonly used in the chlor-alkali industry.
The solution inlet of the anode chamber of the electrolytic cell 2 is used for introducing the concentrated NaCl solution, and the solution outlet of the cathode chamber is used for leading the concentrated NaOH solution out. The following electrolytic reactions take place in the electrolytic cell 2:
the concentrated NaOH solution generated by electrolysis is introduced into the desulfurization washing tower 1 as a desulfurizing agent. Sodium hydroxide (NaOH) solution is used as a desulfurizer, wet washing desulfurization is carried out on the flue gas to be treated, and the purified flue gas is discharged to the atmosphere. The desulfurization washing equipment can be any desulfurization tower which can use NaOH desulfurizing agent. The sulfur dioxide in the flue gas and the desulfurizer react as follows:
when CO is present in the flue gas2Then, the following reaction takes place:
when the NaOH is completely consumed, Na2SO3Can be mixed with SO2Further reaction takes place:
Claims (4)
1. a sodium chloride electrolytic desulfurization method comprises the following steps:
(A) electrolyzing the sodium chloride solution to generate sodium hydroxide;
(B) using solution with sodium hydroxide as a main component as a desulfurizer to wash and desulfurize the waste gas;
2. an apparatus for implementing the method of claim 1, the apparatus comprising:
at least one desulfurization scrubber (1);
at least one-membrane double-chamber cation membrane electrolytic cell (2), wherein the cathode chamber of the electrolytic cell (2) is connected with the desulfurization washing tower (1) through a conduit (3);
3. the apparatus according to claim 2, characterized in that the desulfurization scrubber (1) is equipped at the top with at least one gas outlet duct (4) and at the bottom with at least one gas duct (5) to be treated.
4. The apparatus according to claim 2, characterized in that the anode compartment of the electrolytic cell (2) is provided with a hydrogen outlet (6) and the cathode compartment is provided with a chlorine outlet (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01115416 CN1382515A (en) | 2001-04-24 | 2001-04-24 | Electrolyzing process and equipment for desulfurizing sodium chloride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01115416 CN1382515A (en) | 2001-04-24 | 2001-04-24 | Electrolyzing process and equipment for desulfurizing sodium chloride |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1382515A true CN1382515A (en) | 2002-12-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01115416 Pending CN1382515A (en) | 2001-04-24 | 2001-04-24 | Electrolyzing process and equipment for desulfurizing sodium chloride |
Country Status (1)
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| CN (1) | CN1382515A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104470621A (en) * | 2012-12-19 | 2015-03-25 | 富士电机株式会社 | Exhaust gas purifying apparatus |
| CN106398790A (en) * | 2016-06-23 | 2017-02-15 | 西南石油大学 | A hydrogen sulfide removing device and method for natural gas |
| WO2023012372A1 (en) * | 2021-08-06 | 2023-02-09 | Danmarks Tekniske Universitet | System and method for purification of gasses such as fuel gasses |
-
2001
- 2001-04-24 CN CN 01115416 patent/CN1382515A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104470621A (en) * | 2012-12-19 | 2015-03-25 | 富士电机株式会社 | Exhaust gas purifying apparatus |
| CN104470621B (en) * | 2012-12-19 | 2016-10-19 | 富士电机株式会社 | Emission-control equipment |
| US10363523B2 (en) | 2012-12-19 | 2019-07-30 | Fuji Electric Co., Ltd. | Exhaust gas purifying apparatus |
| CN106398790A (en) * | 2016-06-23 | 2017-02-15 | 西南石油大学 | A hydrogen sulfide removing device and method for natural gas |
| WO2023012372A1 (en) * | 2021-08-06 | 2023-02-09 | Danmarks Tekniske Universitet | System and method for purification of gasses such as fuel gasses |
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Owner name: SHENZHEN KELEIEN BLUE-SKY TECHNOLOGY CO., LTD Free format text: FORMER OWNER: SHENZHEN KELEIEN ENVIRONMENTAL TECHNOLOGY CO., LTD Effective date: 20030313 |
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| C41 | Transfer of patent application or patent right or utility model | ||
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Effective date of registration: 20030313 Applicant after: Shenzhen Kelein Lantian Technology Co., Ltd. Applicant before: Keleien Environment Science and Technology Co Ltd, Shenzhen City |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |