CN101053746B - Method for removing SOX from flue gas with ethylene glycol - Google Patents

Abstract

A solution mainly composed of ethylene glycol (referred to as "ethylene glycol solution") for removing SO _x (x=2 and/or 3) in gas (referred to as "ethylene glycol desulfurization method"). The main component of the ethylene glycol solution of the present invention is ethylene glycol. In the ethylene glycol desulfurization method of the present invention, at first, ethylene glycol solution is used to absorb SO _x (comprising: SO ₂ and/or SO ₃ ) in the gas, and secondly, the ethylene glycol solution that has absorbed SO _x is heated Method, vacuum method, ultrasonic method, microwave method and radiation method to regenerate by one or more methods, releasing sulfur dioxide and sulfur trioxide as by-products, and the regenerated ethylene glycol solution is recycled.

Description

Method for removing SOx in flue gas with ethylene glycol

technical field

The present invention relates to the purification method for removing SOx in flue gas, waste gas containing SOx and/or industrial raw material gas, i.e. removing SOx in flue gas, waste gas containing SOx and/or industrial raw material gas (x=2 and/or the method of 3).

Background technique

Due to the rapid development of industry, the consumption and emission of flue gas, sulfur-containing industrial raw material gas and other waste gases are increasing day by day. The discharge of sulfur-containing exhaust gas has caused serious environmental pollution, such as the formation of acid rain, acidification and corrosion of buildings, respiratory diseases and skin diseases, etc., which directly endanger human health. Over the years, scientific and technological workers from all over the world have conducted more research on flue gas, sulfur-containing industrial raw material gas and other waste gas desulfurization technologies, and have accumulated more research materials. With the enhancement of environmental awareness, the desulfurization of flue gas, sulfur-containing industrial raw material gas and other exhaust gases has been paid more and more attention. However, so far, no breakthrough has been made in flue gas, sulfur-containing industrial raw material gas and other waste gas desulfurization technologies. The desulfurization of flue gas, sulfur-containing industrial feed gas and other waste gases has always been a challenging problem.

The existing flue gas, sulfur-containing industrial raw material gas and other waste gas desulfurization technologies mainly include wet desulfurization and dry desulfurization. The specific wet desulfurization methods include water washing, limestone and lime water, and alkali metal solution. method, alkaline solution method, ammonia method and alcohol amine method, etc.; specific dry desulfurization methods include iron oxide, zinc oxide, manganese oxide, cobalt oxide, chromium oxide, molybdenum oxide, and activated carbon methods. In our country, water washing method, limestone and lime water method are mainly used; in developed countries, limestone and lime water method, alkali metal solution method, alkali solution method, ammonia method and alcohol amine method are used more. However, the water washing method consumes a lot of water, and the water cannot be recycled, and the discharge of sulfur-containing sewage has caused serious secondary pollution, and the desulfurization effect is poor; the limestone and lime water method is better than the water washing method, but produces more calcium sulfate, For solid wastes such as calcium sulfite and calcium carbonate, the consumption of limestone and calcium oxide is large, the equipment is huge, the investment is large, and solid sediments are generated during the absorption process, which can easily cause equipment blockage. Furthermore, due to limestone and calcium hydroxide The solubility in water is very small. When absorbing, calcium hydroxide mainly reacts with carbon dioxide first, and then reacts with sulfur oxides. Therefore, the desulfurization effect of the lime water method is not very ideal, and the sewage discharge is more, causing secondary pollution. More serious; alkali metal solution method, alkali solution method, ammonia method and alcohol amine method are mainly used for flue gas with high sulfur dioxide content (such as steelmaking, copper smelting and other smelting tail gases, the sulfur dioxide content can reach more than 8%) Desulfurization and recovery of sulfur dioxide, these methods require high technical requirements, high energy consumption, high requirements on equipment materials, and are not suitable for general flue gas desulfurization. At the same time, all the flue gas, sulfur-containing industrial raw material gas and other waste gas desulfurization methods currently used are quite corrosive to equipment.

So far, all kinds of gases are rarely desulfurized before being discharged into the atmosphere, and even if they are treated, their content is still relatively high. Existing HiPure method, Benfield method, GV method, ADA method, water washing method, limestone and lime water method, alkali metal solution method, alkaline solution method, ammonia method, alcohol amine method, tannin extract method, and sulfolane method and other desulfurization methods , dry desulfurization iron oxide, zinc oxide, manganese oxide, cobalt oxide, chromium oxide, molybdenum oxide and activated carbon method, etc., are mainly used as primary desulfurization methods to remove hydrogen sulfide in industrial raw material gases, and are not commonly used for desulfurization. In addition to hydrogen sulfide in general gases, the main reason is that the desulfurization efficiency of these desulfurization methods is not high, the operating cost is high, the equipment investment is large, the corrosion is serious, the effect is not ideal, and the removal rate of organic sulfur is poor ^[1～3] . Low-temperature methanol desulfurization technology ^[4] is a method for physically adsorbing hydrogen sulfide, carbon oxides, carbon disulfide and carbon dioxide. It is now common for large chemical companies to decarbonize and desulfurize feed gas. However, due to the low boiling point of methanol, it is volatile and saturated The vapor pressure is large, so it usually needs to be operated at high pressure and low temperature (below -10°C), with high energy consumption, serious loss of methanol, complex process flow, cumbersome operation, and high overall operating cost; the normal temperature methanol method ^[5] uses 60% The mixed solution of methanol and 40% diethanolamine absorbs hydrogen sulfide, carbon dioxide, carbon disulfide and carbon dioxide in the gas, and then heats and decompresses to release hydrogen sulfide, carbon dioxide, carbon disulfide and carbon dioxide. Due to the low boiling point of methanol, it is easy to Volatilization, high saturated vapor pressure, so the release gas contains a large amount of methanol, resulting in unstable solution composition and serious loss of methanol. At the same time, because diethanolamine is easily oxidized and decomposed after exposure to light and air, the chemical stability of the solution is poor. Therefore, the solution The regeneration method can only be heating and decompression regeneration to release the mixed gas of hydrogen sulfide, carbon dioxide sulfur, carbon disulfide and carbon dioxide, and then use the Claus method to convert the released sulfur-containing gas into sulfur, which has high energy consumption. The loss of methanol and diethanolamine is serious, the technological process is complicated, the operation is cumbersome, and the overall operating cost is high. The above methods are mainly used to remove organic sulfur such as hydrogen sulfide, carbon oxysulfide and carbon disulfide in the gas, but not for the removal of SO ₂ and/or SO ₃ in the gas.

Some people use the aqueous solution of urotropine containing glycerol (glycerol) to absorb SO ₂ in the flue gas ^[6] , but in the actual experiment, it is found that urotropine is easily oxidized by the oxygen in it after contacting with the flue gas Decomposition causes the chemical properties of the solution to be unstable, and urotropine is a chemical and pharmaceutical product that is not easy to obtain because of its high price. Therefore, the operating cost is very high and the desulfurization performance is unstable, so that this technology has not been promoted so far.

The buffer solution of acetic acid and ammonia containing Fe ²⁺ and Fe ^{3+ [7-9]} has been applied to the desulfurization of semi-water gas, which has high desulfurization efficiency and low corrosion, but the solution will produce ion effects and Salt effect, solution instability; iron-alkali solution catalytic gas decarburization desulfurization decyanation method wet desulfurization method of aqueous solution of alkaline substances containing iron ions has the ability to remove a variety of sulfur, and for low sulfur content The gas desulfurization effect is better than the traditional gas wet desulfurization method. However, the stability of iron ions in alkaline solution is poor, and a large amount of ferric hydroxide or ferrous hydroxide precipitation will be produced. At the same time, when the iron-alkaline solution is in contact with sulfide-containing gas, a large amount of sulfuration Precipitation of iron or ferrous sulfide causes rapid reduction of iron ion content in the solution, rapid reduction of desulfurization effect, and causes desulfurization tower blockage and other phenomena, which is not suitable for gas desulfurization with high sulfur content ^[10] . In order to improve this situation, we tried to use "iron-alkaline solution" containing microorganisms to desulfurize under normal or increased pressure, and achieved good results ^[11] . At the same time, some people use ethylene glycol or ethylene glycol ester or diethylene glycol monomethyl ether solution to absorb hydrogen sulfide, and then fill the organic solution that has absorbed hydrogen sulfide with sulfur dioxide gas to make hydrogen sulfide and sulfur dioxide react. Generate sulfur to regenerate the organic solution and recycle it ^[12-14] . The method of regenerating the ethylene glycol solution containing hydrogen sulfide with sulfur dioxide is simple, but the source of sulfur dioxide is scarce and difficult to obtain. The transportation process requires special tools and Special safety measures, high operating costs and strict safety measures. Some researchers use ethylene glycol solution, or a mixed solution of ethylene glycol and alkanolamine, or a mixed solution of ethylene glycol and alkanolamine and sodium carbonate, or ethylene glycol dimethyl ether or diglyl dimethyl ether solution, or a mixed aqueous solution of diethylamine and diethylene glycol, triethylene glycol and triethylene glycol methyl ether, or a mixed solution of amine and acetaldehyde, or diethylene glycol monomethyl ether The mixed aqueous solution of ferric nitrosotriacetate absorbs hydrogen sulfide, organic sulfur and water in natural gas or other gases ^[15-23] . However, these technologies mentioned above are only used in the field of desulfurization of industrial feed gas on a large scale at present to remove hydrogen sulfide, carbon oxides of sulfur and carbon disulfide in the gas, and have not been used in the field of flue gas desulfurization to remove SOx (including: sulfur dioxide and/or sulfur trioxide).

references:

[1] Benson, HE Arrish, RW (1974) HiPure Process Removes CO ₂ /H ₂ S. Hydrocarbon Processing, April.81-82.

[2] Jenett, E. (1962), Giammarco-Vetrocoke Process. The Oil and Gas Journal. April 30, 72-79.

[3] F.C.Riesenfeld, A.L.Kohl, translated by Shen Yusheng, "Gas Purification", Beijing, China Architecture Press, 1982.

[4] Dai Wenbin, Tang Hongqing, "Computer and Applied Chemistry", 1994, 11(1), P44-51.

[5] Ma Bin, "Coal Chemical Industry", 1994, Issue 68, P35-38

[6] Zh.Prikl.Khim.(S.-Peterburg), 66(10), 2383-2385(Russian), 1993.

[7] Wei Xionghui, Dai Qianyuan, Chen Zhongming, Shao Kesheng, Zhang Chending, (1998) Principle of desulfurization method in alkaline iron salt buffer solution, Acta Chemical Industry, 49(1), 48-58.

[8] Wei Xionghui, (1994) A new method for desulfurization and deoxidation of semi-water gas, Chinese patent CN1087110.

[9] Wei Xionghui, (1996) Decarburization and desulfurization of pressurized iron-alkali solution, Chinese patent CN1133817.

[10] Wei Xionghui, Zou Meihua, Wei Fenghui, (1999) Iron-alkali solution catalytic gas decarburization, desulfurization and decyanation method, Chinese invention patent, patent number ZL99100596.1.

[11] Wei Xionghui, (2002) Biochemical iron-alkali solution catalytic gas desulfurization method, Chinese invention patent, patent number ZL02130605.2.

[12] Galeeva R.G., Kamalov Kh.S., Aminov M.Kh., Gafiatullin R.R., Mitina A.P., Bakhshijan D.Ts., Safin G.R., Levanov V.V., Installation for Complete purification of Petroleum and Natural Gases, 2RU3C1.04

[13] Biedermann, Jean-Michel, Process for Eliminating Hydrogen Sulphide Contained in Gas Mixture, PCT/FR83/00174.

[14]Biedermann, Jean-Michel, etc., Process for Eliminating Hydrogen Sulphide Contained in Gas Mixture, FR2532190-A1.

[15] Muraoka, Kanyoshi, Dehydration method with ethylene glycol, JP62-95118A.

[16] German patent, using ethylene glycol dehydration method, DT2333708A1.

[17] Patent of the former Soviet Union, SU1611411A1.

[18] Xiaoshi, Wu Yong, JP6-228573A.

[19] Former Soviet Patent, SU655410A.

[20] WYSCHOFSKY Michael, HOBERG Dirk, Method for the Separation of Gaseous Components from Technical Gases by Means of Ethylene GlycolDimethyl Ethers at Low Temperatures, WO03011432A1 (PCT/EP02/07915).

[21] Patent of the former Soviet Union, SU927282B.

[22] DILLON Edward Thomas, Composition and Method for Sweetening Hydrocarbons, WO9007467A1 (PCT/US89/05742).

[23] Zaida Diaz, Process for the Removal of H ₂ S and CO ₂ from Gaseous Streams, US4368178.

Contents of the invention

The object of the present invention is to provide a kind of solution (hereinafter referred to as " ethylene glycol solution ") with ethylene glycol as main component SOx (x=2 and/or 3) method (hereinafter referred to as " ethylene glycol solution ") in removing gas Glycol Desulfurization Method").

The main component of the ethylene glycol solution of the present invention is ethylene glycol. In the ethylene glycol desulfurization method of the present invention, at first, use ethylene glycol solution to absorb SOx (x=2 and/or 3) in the gas, secondly, absorb the ethylene glycol solution of SOx by heating method, vacuum method , Ultrasonic method, microwave method and radiation method in one or more methods of regeneration, the regenerated ethylene glycol solution is recycled.

The ethylene glycol desulfurization method of the present invention has no special requirement to the total SOx content in the sulfur-containing gas before desulfurization, but, in order to achieve better desulfurization effect, the content of total SOx in the preferred sulfur-containing gas should be less than 99.9% (volume ratio ).

In the ethylene glycol desulfurization method of the present invention, there are no strict restrictions on the process conditions, but it is preferable to adopt normal pressure absorption or pressure absorption, and the absorption temperature is preferably -20 to 200°C. Secondly, the ethylene glycol solution that has absorbed SOx is used Regeneration by one or more of heating method, vacuum method, ultrasonic method, microwave method and radiation method, the regeneration temperature is preferably 0-300°C.

The ethylene glycol solution is a liquid fluid mainly containing ethylene glycol, wherein the mass percentage of ethylene glycol is: 15.00%≤ethylene glycol<100.00%; the mass percentage of water is: 0.00%<water≤ 85.00%.

In the ethylene glycol desulfurization method of the present invention, when the ethylene glycol solution that has absorbed SOx is regenerated with one or more methods in heating method, vacuum method, ultra-wave, microwave and radiation method, by-product sulfur dioxide and/or Or sulfur trioxide, and a small amount of sulfur.

The basic principles of the present invention can be illustrated in several ways as follows.

1. When the ethylene glycol solution is pure ethylene glycol, the basic principle of desulfurization is as follows.

When flue gas or other SOx-containing gases come into contact with ethylene glycol solution, the following absorption reactions occur:

The ethylene glycol solution that has absorbed sulfur dioxide and sulfur trioxide is transformed into rich liquid, flows out from the bottom of the desulfurization tower, and enters the regenerator for one or more methods in heating method, vacuum method, ultrasonic method, microwave method and radiation method Regeneration, releasing high-purity sulfur dioxide and/or sulfur trioxide, the rich liquid will undergo some regeneration reactions in the regenerator as follows.

2. When the composition of ethylene glycol solution is a mixture of ethylene glycol and water, the basic principle of desulfurization is as follows.

When the composition of the ethylene glycol solution is a mixture of ethylene glycol and water, its preparation method is to directly add water into the ethylene glycol liquid to make it evenly mixed. At this time, the mass percentage of ethylene glycol is: 15.00%≤ethylene glycol<100.00%; the mass percentage of water is: 0.00%<water≤85.00%.

When flue gas or other SOx-containing gases come into contact with ethylene glycol solution, the following absorption reactions occur:

The ethylene glycol solution that has absorbed sulfur dioxide and sulfur trioxide is transformed into rich liquid, flows out from the bottom of the desulfurization tower, and enters the regenerator for one or more methods in heating method, vacuum method, ultrasonic method, microwave method and radiation method Regeneration, releasing high-purity sulfur dioxide by-products and/or sulfur trioxide by-products, the rich liquid will undergo some regeneration reactions in the regenerator as follows.

The regenerated ethylene glycol solution (hereinafter referred to as "desulfurization solution") is recycled.

In order to realize the above basic principles, we have designed two processes: the first process is the desulfurization absorption process; the second process is the desulfurization liquid regeneration process, and the regeneration methods used in the desulfurization liquid regeneration process include heating method, vacuum method and ultrasonic method , microwave and radiation methods.

The first process: the desulfurization absorption process can be a normal pressure absorption process or a pressurized absorption process, and its desulfurization absorption process is shown in Figure 1. The desulfurization absorption process takes place in the desulfurization tower. Normally, the SOx-containing gas enters the desulfurization tower from the bottom of the desulfurization tower, and the regenerated desulfurization liquid (usually called "lean liquid") enters the desulfurization tower from the top of the desulfurization tower. In the desulfurization tower The SOx-containing gas is in countercurrent contact with the desulfurization liquid, and the SOx substances in the gas are absorbed by the desulfurization liquid. Then, the gas from which SOx has been removed comes out from the top of the desulfurization tower, and the desulfurization liquid that has absorbed the SOx in the gas is transformed into a "rich liquid", "rich liquid". Liquid" enters the regeneration process after coming out of the bottom of the desulfurization tower. In the absorption process, both the gas and the desulfurization liquid enter from the top of the desulfurization tower, and co-current absorption occurs in the desulfurization tower to complete the absorption process.

The second process: desulfurization liquid regeneration process, the regeneration methods used include heating method, vacuum method, ultrasonic method, microwave method and radiation method.

The schematic diagram of the heating regeneration process is shown in Figure 2. The regeneration method is that the desulfurization "rich liquid" that has absorbed SOx enters the heating regenerator, is regenerated under heating, and releases SO ₂ and/or SO ₃ ; the desulfurization after heating and regeneration The liquid is usually called "semi-poor liquid" or "poor liquid" for desulfurization; the "semi-poor liquid" or "poor liquid" can be directly sent to the desulfurization absorption process for reuse, and can also be sent to other regeneration methods for further regeneration. Then it is sent to the desulfurization absorption process for repeated use.

The schematic diagram of the vacuum regeneration process is shown in Figure 3. The regeneration method is that the desulfurization "rich liquid" that has absorbed SOx enters the vacuum regenerator and is vacuumized for regeneration. At this time, SO ₂ and/or SO ₃ are released; after vacuum regeneration The desulfurized liquid is usually called "semi-poor liquid" or "poor liquid" for desulfurization; the "semi-poor liquid" or "poor liquid" can be directly sent to the desulfurization absorption process for reuse, and can also be sent to other regeneration methods for further regenerated, and then sent to the desulfurization absorption process for reuse.

The schematic diagram of the regeneration process of the ultrasonic method and/or microwave method or radiation method is shown in Figure 4. The regeneration method is that the desulfurization "rich liquid" that has absorbed SOx enters the ultrasonic and/or microwave or radiation regenerator, and is heated by ultrasonic and Under the irradiation of/or microwave or radiation wave, SO ₂ and/or SO ₃ are released; the desulfurization liquid regenerated by ultrasonic wave and/or microwave or radiation is usually called desulfurization "semi-poor liquid" or "poor liquid";"Semi-poorliquid" or "lean liquid" can be directly sent to the desulfurization absorption process for reuse, or can be sent to other regeneration methods for further regeneration, and then sent to the desulfurization absorption process for reuse.

The above-mentioned regeneration methods such as heating method, vacuum method, ultrasonic method, microwave method and radiation method can also be two or more methods combined in one regenerator.

Compared with traditional wet desulfurization technology (such as calcium desulfurization technology, ammonia desulfurization technology, etc.), the present invention has the following advantages: ① traditional wet desulfurization technology is only applicable to gas desulfurization with lower sulfur content, and the present invention refers to The ethylene glycol desulfurization method can be used for both low-sulfur gas desulfurization and high-sulfur gas desulfurization; ②The traditional wet desulfurization technology will produce insoluble calcium salt or ammonium salt precipitation during the whole desulfurization and regeneration process, causing equipment and pipeline blockage, the ethylene glycol desulfurization method of the present invention basically can not produce insoluble calcium salt or ammonium salt precipitation; ③ when traditional wet desulfurization technology is used for flue gas desulfurization, its by-product is calcium sulfate and Calcium sulfite, or ammonium sulfate and ammonium sulfite, the by-products of the ethylene glycol desulfurization method referred to in the present invention are high-purity liquid sulfur dioxide and/or sulfur trioxide, these by-products are important chemical raw materials and have a wide market And important application value; the ethylene glycol desulfurization method has a high degree of purification, can stably reduce the total sulfur content in the gas to below 5mg/m ³ , and at the same time has low operating costs, short process, small investment and simple operation.

The ethylene glycol desulfurization method described in the present invention has a wide range of industrial applications, and it can be used for flue gas, incineration gas, coke oven gas, synthetic waste gas from a dye factory, blowdown gas from a chemical fiber factory, Claus (Cross) tail gas, As well as the desulfurization of other industrial feed gas or exhaust gas containing SOx, the total sulfur content in the above-mentioned sulfur-containing gases is all less than 99.9% (volume ratio).

Description of drawings

Figure 1 is a schematic diagram of the desulfurization absorption process.

Figure 2 is a schematic diagram of the desulfurization liquid heating regeneration method.

Fig. 3 is a schematic diagram of the vacuum regeneration mode of the desulfurization liquid.

Fig. 4 is a schematic diagram of ultrasonic and/or microwave and/or radiation regeneration of desulfurized liquid.

Detailed ways

The ethylene glycol desulfurization method of the present invention will be described below in conjunction with specific embodiments. The embodiments described are for better illustration of the present invention and should not be construed as limiting the claims of the present invention.

The first process is the desulfurization absorption process, and its implementation is shown in Figure 1, wherein, (1) desulfurization tower, (2) SOx-containing gas, (3) purified gas, (4) desulfurization lean liquid, (5) desulfurization rich liquid.

Referring to Fig. 1, the SOx-containing gas (2) enters from the bottom of the desulfurization tower (1), and contacts with the desulfurization lean liquid (4) countercurrently; the SOx in the SOx-containing gas (2) is absorbed by the lean liquid (4), and the SOx-containing gas ( 2) converted into purified gas (3) from the top of the desulfurization tower (1); the desulfurized poor liquid (4) that has absorbed SOx is transformed into a desulfurized rich liquid (5) at the bottom of the desulfurized tower (1); the desulfurized rich liquid (5) The outflow from the bottom of the desulfurization tower (1) is sent to the desulfurization liquid regeneration process for regeneration by one or more methods of heating, vacuum, ultrasonic, microwave and radiation.

According to the method shown in Figure 1, we use gas chromatography to measure the content of sulfur dioxide in the gas, and use the method of iodometric method to measure the content of sulfur dioxide in the liquid phase. The absorption balance data when the absorption reaches equilibrium is as follows:

Table 1. 298.15K, 101.86KPa, ethylene glycol absorption balance data for sulfur dioxide gas

Table 2. 298.15K, 112.53KPa, ethylene glycol absorption balance data for sulfur dioxide gas

Table 3. 298.15K, 123.19KPa, ethylene glycol absorption balance data for sulfur dioxide gas

Table 4. 298.15K, 133.85KPa, ethylene glycol absorption balance data for sulfur dioxide gas

Table 5. 298.15K, 144.53KPa, ethylene glycol absorption balance data for sulfur dioxide gas

The second process is the desulfurization liquid regeneration process. The regeneration methods used in the desulfurization liquid regeneration process include heating method, vacuum method, ultrasonic method, microwave method and radiation method.

The embodiment of heating regeneration mode is shown in Figure 2, wherein, (4) desulfurization lean liquid, (5) desulfurization rich liquid, (7) sulfur dioxide and/or sulfur trioxide, (8) sulfur foam and/or dust, ( 9) Heating the regenerator.

Referring to Fig. 2, desulfurization rich liquid (5) is sent in the heating regenerator (9), is heated, releases gaseous sulfur dioxide and/or sulfur trioxide (7), and gaseous sulfur dioxide and/or sulfur trioxide (7) can be After some processing methods, it is transformed into high-purity liquid sulfur dioxide and/or sulfur trioxide by-products. At the same time, sulfur foam and/or dust (8) will be generated or enriched to achieve separation from the main body of the desulfurization liquid, and the separated sulfur Foam and/or dust (8) can be further processed into sulfur by-products, and some ash and slag will be discharged; desulfurization rich liquid (5) is converted into desulfurization lean liquid (4) after being regenerated by heating regenerator (9); The desulfurization lean liquid (4) can be directly sent to the desulfurization absorption process for recycling, and can also be sent to vacuum regeneration and/or ultrasonic and/or microwave and/or radiation regeneration for further regeneration.

The implementation of the vacuum regeneration method is shown in Figure 3, wherein, (4) desulfurization lean liquid, (5) desulfurization rich liquid, (7) sulfur dioxide and/or sulfur trioxide, (8) sulfur foam and/or dust, ( 10) vacuum regenerator, (11) vacuum pump.

Referring to Fig. 3, the desulfurized rich liquid (5) is sent to the vacuum regenerator (10), and a vacuum is generated under the action of the vacuum pump (11), releasing gaseous sulfur dioxide and/or sulfur trioxide (7), the gaseous sulfur dioxide And/or sulfur trioxide (7) can be converted into high-purity liquid sulfur dioxide and/or sulfur trioxide by-products through some processing methods, and at the same time, sulfur foam and/or dust (8) will also be produced or enriched to achieve Separated from the main body of the desulfurization liquid, the separated sulfur foam and/or dust (8) can be further processed into sulfur by-products, and some ash and residue will be discharged; the desulfurization rich liquid (5) is regenerated by the vacuum regenerator (10) , into the desulfurization lean liquid (4); the desulfurization lean liquid (4) can be directly sent to the desulfurization absorption process for recycling, and can also be sent to heating regeneration and/or ultra-wave and/or microwave and/or radiation regeneration for further regeneration.

The embodiment of ultrasonic and/or microwave and/or radiation regeneration mode is shown in Figure 4, wherein, (4) desulfurization poor liquid, (5) desulfurization rich liquid, (6) ultrasonic and/or microwave and/or radiation Regenerator, (7) sulfur dioxide and/or sulfur trioxide, (8) sulfur foam and/or dust.

Referring to Fig. 4, desulfurization rich liquid (5) is sent in the superwave and/or microwave and/or radiation regenerator (6), releases gaseous sulfur dioxide and/or under the irradiation of superwave and/or microwave and/or radiation Or sulfur trioxide (7), gaseous sulfur dioxide and/or sulfur trioxide (7) can be converted into high-purity liquid sulfur dioxide and/or sulfur trioxide by-products through some processing methods, and at the same time, there will be sulfur foam and/or Dust (8) is generated or enriched to achieve separation from the main body of the desulfurization liquid, and the separated sulfur foam and/or dust (8) can be further processed into sulfur by-products, and some ash and slag will be discharged; the desulfurization rich liquid (5 ) after being regenerated by ultrasonic wave and/or microwave and/or radiation regenerator (6), it is transformed into desulfurization lean liquid (4); Regeneration and/or vacuum regeneration for further regeneration.

Claims (13)

1. a method for absorbing SOx in gas with ethylene glycol solution, is characterized in that: described ethylene glycol solution is made up of water and ethylene glycol, and after ethylene glycol solution and the gas contact containing SOx, absorb gas In SOx, x=2 and/or 3, so that the gas can be purified. 2. a kind of method according to claim 1 absorbs the SOx in the gas with ethylene glycol solution, it is characterized in that: in the described ethylene glycol solution, ethylene glycol and water are composed of: the mass percent of ethylene glycol The content is: 15.00% ≤ ethylene glycol < 100.00%; the water quality percentage is: 0.00% < water ≤ 85.00%. 3. The method for absorbing SOx in gas with ethylene glycol solution according to claim 1, characterized in that atmospheric pressure absorption or pressurized absorption is used, and the absorption temperature is -20 to 200°C. 4. The method for absorbing SOx in gas with ethylene glycol solution according to claim 2, characterized in that atmospheric pressure absorption or pressurized absorption is used, and the absorption temperature is -20 to 200°C. 5. according to the method for the SOx in the described ethylene glycol solution absorption gas of claim 1-4 any one, it is characterized in that the volume percent composition of total SOx in the sulfur-containing gas should be less than 99.9%. 6. according to the method for the SOx in the ethylene glycol solution absorption gas described in claim 1-4 any one, it is characterized in that to absorbing the SOx ethylene glycol solution in the gas with heating method, vacuum method, ultrasonic wave One or more methods of regeneration, microwave and radiation, the regeneration temperature is 0-300°C, sulfur dioxide and/or sulfur trioxide are released during the regeneration process, and the regenerated ethylene glycol solution can be recycled. 7. The method for absorbing SOx in the ethylene glycol solution according to any one of claims 1-4, characterized in that it is used for removing SOx in waste gas containing SOx and/or industrial raw material gas. 8. the method for the SOx in the ethylene glycol solution absorbing gas according to claim 7, is characterized in that the waste gas containing SOx is flue gas. 9. the method for the SOx in the ethylene glycol solution absorbing gas according to claim 5 is characterized in that being used for removing SOx in waste gas containing SOx and/or industrial raw material gas. 10. the method for the SOx in the ethylene glycol solution absorbing gas according to claim 9, is characterized in that the waste gas containing SOx is flue gas. 11. the method for the SOx in the ethylene glycol solution absorbing gas according to claim 6 is characterized in that being used for removing SOx in waste gas containing SOx and/or industrial feed gas. 12. the method for the SOx in the ethylene glycol solution absorbing gas according to claim 11, it is characterized in that the waste gas containing SOx is flue gas. 13. the method for the SOx in the ethylene glycol solution absorption gas according to claim 6 is characterized in that when the ethylene glycol solution that has absorbed the SOx in the gas is regenerated, said heating method, vacuum method, ultrasonic wave The regeneration methods of microwave, radiation and radiation are two or more regeneration methods combined in one regenerator.

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