CN112316656A - Device system and method for desulfurizing steel smelting gas and recycling sulfur - Google Patents
Device system and method for desulfurizing steel smelting gas and recycling sulfur Download PDFInfo
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Abstract
The invention relates to a device system and a method for steel smelting gas desulfurization and sulfur recycling, wherein the device system comprises a desulfurization device, a regeneration device, an acid making device, a modification device and a hydrolysis device; the method comprises the following steps: (1) removing sulfur dioxide in the flue gas by using formed activated carbon to obtain saturated activated carbon; (2) regenerating the saturated activated carbon obtained in the step (1) to obtain regenerated fine particles, regenerated coarse particles and a sulfur-containing material; (3) the regenerated fine particles obtained in the step (2) are used for flue gas desulfurization to obtain saturated fine particles; (4) and (3) modifying the regenerated coarse particles obtained in the step (2) to remove reduced sulfur in the coal gas to obtain saturated fine particles and saturated coarse particles. The invention provides a synergistic treatment system and a process which can recycle an activated carbon adsorption catalyst and combine flue gas, coal gas desulfurization and sulfur recycling into a whole, thereby saving the treatment cost and improving the desulfurization efficiency of steel smelting gas.
Description
Technical Field
The invention belongs to the technical field of coal gas and flue gas desulfurization, relates to steel smelting gas desulfurization, and particularly relates to a device system and a method for steel smelting gas desulfurization and sulfur recycling.
Background
For the steel smelting industry, the treatment of sulfur pollutants is the key point of various pollution control, however, the emission reduction of pollutants in the existing steel smelting gas mainly adopts a mode of separately and independently treating flue gas and coal gas, and the removal and resource of the pollutants in the whole steel industry are not subjected to cooperative treatment. For example, a moving bed formed activated carbon desulfurization and denitrification process and a semi-dry desulfurization-SCR honeycomb catalyst denitrification process are adopted for sintering flue gas; the coke oven flue gas adopts a dry SDS desulfurization-cloth bag dust removal-medium and low temperature denitration process and a formed activated carbon countercurrent purification process; the removal of reduced sulfur species (hydrogen sulfide, carbonyl sulfide) in blast furnace gas is mainly divided into dry desulfurization and wet desulfurization: the dry desulfurization usually adopts iron-based and carbon-based materials to absorb and remove sulfides in the coal gas, and the wet desulfurization adopts alkaline solution to absorb and remove sulfides in the coal gas.
The sulfur species generated in the sintering flue gas and the coke oven flue gas mainly take sulfur dioxide and other oxidation state substances as main materials, and the sulfur species generated in the blast furnace gas mainly take carbonyl sulfur, hydrogen sulfide and other reduction state substances as main materials. And the front end gas desulfurization can not only greatly reduce the investment cost, but also reduce the corrosion to the equipment compared with the tail end flue gas desulfurization after combustion. For a long time, the iron and steel industry pays more attention to inorganic sulfur (hydrogen sulfide and sulfur dioxide), develops various purification control measures and meets the environmental protection requirement of smoke emission to a certain extent. However, because the carbonyl sulfide in the blast furnace gas is known later, the content, the harm and the removal technology of the carbonyl sulfide in the blast furnace gas are not taken into consideration all the time, and the technology and the corresponding process equipment suitable for removing the carbonyl sulfide in the steel industry are still lacked in China at present.
CN 110624374a discloses a moving bed active coke desulfurization and denitrification system and method for recycling waste active coke powder, which not only realize the desulfurization and denitrification treatment of flue gas, convert the adsorbed sulfur species into sulfuric acid for recycling, but also effectively improve the utilization efficiency of active coke resources and reduce the operating cost of the moving bed active coke desulfurization and denitrification. However, the system and the method can not realize the removal of the reduced sulfur in the coal gas, and still need to be further perfected.
CN 1204955C discloses a method for desulfurizing active coke and recycling sulfur in a circulating fluidized bed, which has high desulfurization efficiency, low water consumption, no secondary pollution, capability of recycling sulfur, dust removal and denitration and wide application temperature range compared with other existing desulfurization technologies; compared with the moving bed active coke desulfurization method, the method has the advantages of lower investment and operation cost, more reliable operation, less active coke consumption and the like. However, the method also cannot realize the removal of reduced sulfur in the coal gas.
CN 103980955A discloses a coal gas desulfurization and sulfur regeneration process and a device, wherein the process adopts activated carbon with low price and high mechanical strength to desulfurize coal gas, the efficiency is high, and the sulfur emission index can be met by one-time desulfurization. And the used waste activated carbon can be recycled, secondary pollution is reduced, the adsorbed sulfur species are finally converted into pure solid elemental sulfur, the storage and the transportation are easy, and the economic value is considerable. However, the process and the device can not realize the adsorption removal of carbonyl sulfide in the coal gas, and whether the device is suitable for the desulfurization operation of the flue gas is not disclosed.
CN 110819393a discloses a method and a device for fine desulfurization and purification of blast furnace gas, in which low-concentration sulfides in blast furnace gas are enriched in sulfur-rich concentrated gas, and the working conditions of large gas amount and low-concentration sulfides are converted into low gas amount and high concentration working conditions, so as to improve desulfurization effect, reduce desulfurization investment cost and operation cost, recover sulfur element in blast furnace gas, have high atom economy, and reduce secondary pollution. However, the method and apparatus have not been disclosed as being equally applicable to flue gas desulfurization operations.
Therefore, how to develop a synergistic treatment system and process which can recycle the activated carbon adsorption catalyst and combine flue gas, coal gas desulfurization and sulfur recycling into a whole becomes a problem which needs to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a device system and a method for desulfurizing steel smelting gas and recycling sulfur, which can recycle an activated carbon adsorption catalyst, combine flue gas desulfurization, coal gas desulfurization and sulfur recycling into a whole, save the treatment cost and improve the desulfurization efficiency of the steel smelting gas.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a steel smelting gas desulfurization and sulfur recycling device system, which comprises a desulfurization device, a regeneration device, an acid making device, a modification device and a hydrolysis device; the desulfurization device is internally provided with formed activated carbon for desulfurization; the regeneration device is used for regenerating the inactivated formed activated carbon in the desulfurization device, and sulfur-containing materials generated during regeneration enter the acid preparation device to obtain sulfuric acid; the regenerated fine particles obtained by the regeneration device are reused in the desulfurization device; feeding the regenerated coarse particles obtained by the regeneration device into a modification device; the modification device is used for providing modified activated carbon for the hydrolysis device, and the hydrolysis device utilizes the modified activated carbon to remove reduced sulfur.
In the present invention, the regenerated fine particles have a particle size of 0.2mm or less, for example, 0.025mm, 0.05mm, 0.075mm, 0.1mm, 0.125mm, 0.15mm, 0.175mm or 0.2mm, but are not limited to the values listed, and other values not listed in the numerical range are also applicable.
In the present invention, the regenerated coarse particles have a particle size of > 0.2mm, for example, 0.225mm, 0.5mm, 1mm, 2mm, 3mm, 4mm, 6mm or 8mm, but are not limited to the values listed, and other values not listed in the numerical range are also applicable.
Preferably, the desulfurization unit is any one of a fixed bed reactor, a moving bed reactor, or a fluidized bed reactor, or a combination of at least two thereof, and typical but non-limiting combinations include a fixed bed reactor in combination with a moving bed reactor, a moving bed reactor in combination with a fluidized bed reactor, or a fixed bed reactor, a moving bed reactor in combination with a fluidized bed reactor.
Preferably, the regeneration means is any one of, or a combination of at least two of, a fixed bed reactor, a moving bed reactor, or a fluidized bed reactor, and typical but non-limiting combinations include a fixed bed reactor in combination with a moving bed reactor, a moving bed reactor in combination with a fluidized bed reactor, or a fixed bed reactor, a moving bed reactor in combination with a fluidized bed reactor.
Preferably, the modifying means is any one or a combination of at least two of a fixed bed reactor, a moving bed reactor or a fluidized bed reactor, and typical but non-limiting combinations include a fixed bed reactor in combination with a moving bed reactor, a moving bed reactor in combination with a fluidized bed reactor, or a fixed bed reactor, a moving bed reactor in combination with a fluidized bed reactor.
Preferably, the hydrolysis apparatus is any one of, or a combination of at least two of, a fixed bed reactor, a moving bed reactor, or a fluidized bed reactor, and typical but non-limiting combinations include a fixed bed reactor in combination with a moving bed reactor, a moving bed reactor in combination with a fluidized bed reactor, or a fixed bed reactor, a moving bed reactor in combination with a fluidized bed reactor.
According to the invention, the regeneration device realizes cyclic utilization of activated carbon, the acid making device realizes sulfur recycling, and the modification device combines the flue gas desulfurization function of the desulfurization device with the coal gas desulfurization function of the hydrolysis device, so that the steel smelting gas desulfurization and sulfur recycling device system becomes an organic whole, realizes cyclic utilization of activated carbon, and becomes a synergistic treatment system combining flue gas desulfurization, coal gas desulfurization and sulfur recycling.
In a second aspect, the present invention provides a method for desulfurizing a steel smelting gas and recycling sulfur using the apparatus system of the first aspect, the method comprising the steps of:
(1) removing sulfur dioxide in the flue gas by using formed activated carbon to obtain saturated activated carbon;
(2) regenerating the saturated activated carbon obtained in the step (1) to obtain regenerated fine particles, regenerated coarse particles and a sulfur-containing material;
(3) the regenerated fine particles obtained in the step (2) are used for flue gas desulfurization to obtain saturated fine particles;
(4) modifying the regenerated coarse particles obtained in the step (2) to remove reduced sulfur in the coal gas to obtain saturated fine particles and saturated coarse particles;
the step (3) and the step (4) are not in sequence.
In the present invention, the regeneration treatment process in step (2) is performed in the regeneration device of the first aspect, and the regeneration device is any one of a fixed bed reactor, a moving bed reactor, or a fluidized bed reactor, or a combination of at least two of them. The regeneration treatment process performed in the regeneration device is accompanied with the collision and extrusion of the activated carbon, so that part of the activated carbon is crushed, therefore, the regeneration treatment process further comprises a screening process, and the obtained regenerated activated carbon is screened to obtain regenerated fine particles and regenerated coarse particles.
In the invention, the modified activated carbon in the step (4) is used for removing reduced sulfur in coal gas, and the coal gas desulfurization process is carried out in the hydrolysis device in the first aspect, wherein the hydrolysis device is any one or a combination of at least two of a fixed bed reactor, a moving bed reactor and a fluidized bed reactor. The coal gas desulfurization process performed in the hydrolysis device is accompanied with the collision and extrusion of activated carbon, so that part of the activated carbon is crushed, and therefore, the desulfurized saturated activated carbon needs to be screened to obtain saturated fine particles and saturated coarse particles.
Preferably, the saturated coarse particles in the step (4) are reused in the step (2), that is, the saturated coarse particles in the step (4) are subjected to regeneration treatment to obtain regenerated fine particles, regenerated coarse particles and sulfur-containing materials.
Preferably, the saturated fine particles of step (3) and the saturated fine particles of step (4) are used for fuel combustion.
In the invention, the sulfur dioxide in the flue gas generated by fuel combustion can be removed by the desulfurization treatment in the step (1), and the purified flue gas is obtained.
Preferably, the sulfur-containing material of step (2) is used for preparing sulfuric acid.
In the invention, the sulfur-containing material in the step (2) comprises sulfur dioxide and/or sulfur trioxide, and the method for preparing sulfuric acid by using the sulfur-containing material is a conventional purification-sulfuric acid preparation process.
Preferably, the raw material for preparing the shaped activated carbon in step (1) comprises any one or a combination of at least two of coal, coking coal and semi-coke, and typical but non-limiting combinations comprise a combination of coal and coking coal, a combination of coking coal and semi-coke, or a combination of coal, coking coal and semi-coke.
Preferably, the sulfur capacity of the shaped activated carbon of step (1) for adsorbing sulfur dioxide is 24mg/g or more, such as 24mg/g, 34mg/g, 44mg/g, 54mg/g, 64mg/g, 74mg/g, 84mg/g, 94mg/g or 104mg/g, but not limited to the values listed, and other values not listed in the range are also applicable.
In the invention, sulfur dioxide in the flue gas is adsorbed by the activated carbon and then continuously oxidized into sulfuric acid to be stored in the activated carbon pores, and reduced sulfur in the coal gas is adsorbed by the activated carbon and then continuously hydrolyzed and oxidized, and finally stored in the activated carbon pores in the form of elemental sulfur.
Preferably, the shaped activated carbon of step (1) has an attrition resistance of 95% or more, and can be, for example, 95%, 95.5%, 96%, 96.5%, 97%, 97.5%, 98%, 98.5%, 99%, or 99.5%, but is not limited to the recited values, and other values not recited in this range are also applicable.
Preferably, the surface area of the formed activated carbon in the step (1) is more than or equal to 200m2A/g, which may be, for example, 200m2/g、250m2/g、300m2/g、350m2/g、400m2/g、450m2G or 500m2In the following description,/g is not limited to the values listed, but other values not listed in the numerical range are equally applicable.
Preferably, the particle diameter of the shaped activated carbon of step (1) is 5mm or more, for example, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm or 10mm, but is not limited to the values listed, and other values not listed in the range of the values are also applicable.
Preferably, the regeneration treatment of step (2) comprises superheated steam regeneration and/or high-temperature nitrogen regeneration, and further preferably superheated steam regeneration.
Preferably, the temperature of the regeneration treatment is 400 ℃ or 500 ℃, and may be, for example, 400 ℃, 410 ℃, 420 ℃, 430 ℃, 440 ℃, 450 ℃, 460 ℃, 470 ℃, 480 ℃, 490 ℃ or 500 ℃, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
In the invention, the regeneration treatment removes the sulfur species adsorbed in the saturated activated carbon at high temperature, so that the adsorption activity of the activated carbon is recovered again after the sulfur species are removed, thereby realizing the cyclic utilization of the activated carbon and reducing the treatment cost. In addition, the regeneration treatment reduces the adding times of fresh activated carbon, and further improves the desulfurization efficiency of the steel smelting gas.
Preferably, the modification treatment in step (4) is an alkali treatment.
Preferably, the alkaline solution used for the alkaline treatment comprises any one or a combination of at least two of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate or potassium bicarbonate, typical but non-limiting combinations include sodium hydroxide in combination with potassium hydroxide, potassium hydroxide in combination with sodium carbonate, sodium carbonate in combination with sodium bicarbonate, sodium bicarbonate in combination with potassium carbonate, or potassium carbonate in combination with potassium bicarbonate.
Preferably, the concentration of the alkali solution is 1 to 10mol/L, and may be, for example, 1mol/L, 2mol/L, 3mol/L, 4mol/L, 5mol/L, 6mol/L, 7mol/L, 8mol/L, 9mol/L or 10mol/L, but is not limited to the recited values, and other values not recited in the numerical range are also applicable.
Preferably, the temperature of the alkali treatment is 50 to 150 ℃, for example, 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃, 110 ℃, 120 ℃, 130 ℃, 140 ℃ or 150 ℃, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the time of the alkali treatment is 1 to 10 hours, for example, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, 9 hours or 10 hours, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
In the invention, the activated carbon treated by the alkali can adsorb reduced sulfur in coal gas, hydrolyze and oxidize the reduced sulfur, and finally store the hydrolyzed and oxidized reduced sulfur in the pores of the activated carbon in the form of elemental sulfur, thereby realizing the removal of the reduced sulfur.
Preferably, the reduced sulfur of step (4) is carbonyl sulfide and/or hydrogen sulfide.
Preferably, the regenerated fine particles of step (2) have a particle size of 0.2mm or less, for example 0.025mm, 0.05mm, 0.075mm, 0.1mm, 0.125mm, 0.15mm, 0.175mm or 0.2mm, but are not limited to the values listed, and other values not listed in this range are equally suitable.
Preferably, the particle size of the saturated fine particles in step (3) and the particle size of the saturated fine particles in step (4) are not more than 0.2mm, and may be, for example, 0.025mm, 0.05mm, 0.075mm, 0.1mm, 0.125mm, 0.15mm, 0.175mm, or 0.2mm, but is not limited to the enumerated values, and other unrecited values within the numerical range are also applicable.
Preferably, the regenerated coarse particles from step (2) and the saturated coarse particles from step (4) have a particle size of > 0.2mm, for example 0.5mm, 1mm, 2mm, 3mm, 5mm, 6mm, 7mm or 8mm, but are not limited to the values listed, and other values not listed in this range are equally suitable.
As a preferred technical scheme of the invention, the method comprises the following steps:
(1) using any one of coal, coking coal or semi cokeOr removing sulfur dioxide in the flue gas by using the formed activated carbon prepared by combining at least two of the activated carbon to obtain saturated activated carbon; the sulfur capacity of the formed active carbon for absorbing sulfur dioxide is more than or equal to 24mg/g, the wear-resisting strength is more than or equal to 95 percent, and the surface area is more than or equal to 200m2Per gram, the diameter of the particles is more than or equal to 5 mm;
(2) regenerating the saturated activated carbon obtained in the step (1) by using 400-plus 500-DEG C superheated steam to obtain regenerated activated carbon and a sulfur-containing material, and screening the regenerated activated carbon to obtain regenerated fine particles with the particle size of less than or equal to 0.2mm and regenerated coarse particles with the particle size of more than 0.2 mm; the sulfur-containing species is used to produce sulfuric acid;
(3) the regenerated fine particles obtained in the step (2) are used for flue gas desulfurization to obtain saturated fine particles with the particle size of less than or equal to 0.2mm, and the saturated fine particles are used for fuel combustion;
(4) the regenerated coarse particles obtained in the step (2) are subjected to alkali treatment and then used for removing carbonyl sulfide and/or hydrogen sulfide in coal gas to obtain saturated activated carbon, and the saturated activated carbon is screened to obtain saturated fine particles with the particle size of less than or equal to 0.2mm and saturated coarse particles with the particle size of more than 0.2 mm; the alkaline solution used for the alkaline treatment comprises any one or the combination of at least two of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate or potassium bicarbonate; the concentration of the alkali solution is 1-10mol/L, the treatment temperature is 50-150 ℃, and the treatment time is 1-10 h; recycling the saturated coarse particles to the step (2), and using the saturated fine particles for fuel combustion;
the step (3) and the step (4) are not in sequence.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the saturated activated carbon is regenerated, so that the cyclic utilization of the activated carbon adsorption catalyst is realized, the adding times of fresh activated carbon are reduced, the treatment cost is saved, and the desulfurization efficiency of the steel smelting gas is improved;
(2) the invention realizes the synergistic treatment of the flue gas and the coal gas, and the content of sulfur dioxide in the purified flue gas is reduced to minimum 10mg/m3The carbonyl sulfur content and the hydrogen sulfide content in the purified coal gas are both reduced to the minimum of 5mg/m3(ii) a Simultaneously combines the sulfur resource treatment, improves the iron and steel smeltingThe environmental protection and the economical efficiency of the refining gas treatment.
Drawings
FIG. 1 is a schematic view of a system of a steel smelting gas desulfurization and sulfur recycling apparatus provided in examples 1 to 3;
FIG. 2 is a schematic view of the system of the steelmaking gas remediation apparatus provided in comparative example 1;
FIG. 3 is a schematic view of the system of the steelmaking gas remediation apparatus of comparative example 2.
Wherein, 1-a desulfurizing device; 2-a regeneration device; 3-an acid making device; 4-a modification device; 5-a hydrolysis device; a-flue gas; b-purifying the flue gas; c-forming activated carbon; d-saturated activated carbon; e-superheated steam; f-a sulfur-containing material; g-sulfuric acid; h-regeneration of fine particles; i-regeneration of coarse particles; j-modified activated carbon; k-gas; l-purifying the gas; m-saturated fine particles, n-saturated coarse particles.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
As a preferred embodiment of the present invention, the system of the steel smelting gas desulfurization and sulfur recycling apparatus according to the present invention includes, as shown in fig. 1, a desulfurization apparatus 1, a regeneration apparatus 2, an acid making apparatus 3, a modification apparatus 4, and a hydrolysis apparatus 5.
The desulfurization device 1 of the embodiment is provided with formed activated carbon c for desulfurization; the regeneration device 2 is used for regenerating the inactivated formed activated carbon c in the desulfurization device 1, the sulfur-containing material f generated during regeneration enters the acid preparation device 3, and sulfuric acid g is obtained from the acid preparation device 3; the regenerated fine particles h obtained by the regenerating device 2 are reused in the desulfurizing device 1; the regenerated coarse particles i obtained by the regenerating device 2 enter a modifying device 4; the modification device 4 is used for providing modified activated carbon j for the hydrolysis device 5, and the hydrolysis device 5 removes reduced sulfur by using the modified activated carbon j.
When the device system for desulfurizing the steel smelting gas and recycling the sulfur provided by the invention is applied, the flue gas a enters from the bottom of the desulfurizing device 1, is converted into purified flue gas b after being in reverse contact with the formed activated carbon c entering from the top of the desulfurizing device 1, and is discharged from the top of the desulfurizing device 1; the saturated activated carbon d absorbing the sulfur dioxide in the flue gas a enters a regeneration device 2 to be converted into regenerated fine particles h, regenerated coarse particles i and sulfur-containing materials f; the regenerated fine particles h are reused in the desulfurization device 1, the regenerated coarse particles i enter a modification device 4 to be converted into modified activated carbon j, and the sulfur-containing material f enters an acid making device 3 to be converted into sulfuric acid g; the modified activated carbon j enters the hydrolysis device 5 from the top and reversely contacts with the coal gas k entering from the bottom of the hydrolysis device 5; the coal gas k is converted into purified coal gas l, and the modified activated carbon is converted into saturated coarse particles n and saturated fine particles m; the saturated coarse particles n are reused in the regeneration device 2, and the saturated fine particles m are combusted as fuel.
Example 1
The embodiment provides a steel smelting gas desulfurization and sulfur recycling device system as shown in fig. 1, which comprises a desulfurization device 1, a regeneration device 2, an acid making device 3, a modification device 4 and a hydrolysis device 5.
The desulfurization device 1 of the embodiment is provided with formed activated carbon c for desulfurization; the regeneration device 2 is used for regenerating the inactivated formed activated carbon c in the desulfurization device 1, the sulfur-containing material f generated during regeneration enters the acid preparation device 3, and sulfuric acid g is obtained from the acid preparation device 3; the regenerated fine particles h obtained by the regenerating device 2 are reused in the desulfurizing device 1; the regenerated coarse particles i obtained by the regenerating device 2 enter a modifying device 4; the modification device 4 is used for providing modified activated carbon j for the hydrolysis device 5, and the hydrolysis device 5 removes reduced sulfur by using the modified activated carbon j.
In this embodiment, the desulfurization apparatus 1, the regeneration apparatus 2, the modification apparatus 4, and the hydrolysis apparatus 5 are all moving bed reactors.
Example 2
The embodiment provides a steel smelting gas desulfurization and sulfur recycling device system as shown in fig. 1, which comprises a desulfurization device 1, a regeneration device 2, an acid making device 3, a modification device 4 and a hydrolysis device 5.
The desulfurization device 1 of the embodiment is provided with formed activated carbon c for desulfurization; the regeneration device 2 is used for regenerating the inactivated formed activated carbon c in the desulfurization device 1, the sulfur-containing material f generated during regeneration enters the acid preparation device 3, and sulfuric acid g is obtained from the acid preparation device 3; the regenerated fine particles h obtained by the regenerating device 2 are reused in the desulfurizing device 1; the regenerated coarse particles i obtained by the regenerating device 2 enter a modifying device 4; the modification device 4 is used for providing modified activated carbon j for the hydrolysis device 5, and the hydrolysis device 5 removes reduced sulfur by using the modified activated carbon j.
In this embodiment, the desulfurization device 1 and the regeneration device 2 are both moving bed reactors, the modification device 4 is a fixed bed reactor, and the hydrolysis device 5 is a fluidized bed reactor.
Example 3
The embodiment provides a steel smelting gas desulfurization and sulfur recycling device system as shown in fig. 1, which comprises a desulfurization device 1, a regeneration device 2, an acid making device 3, a modification device 4 and a hydrolysis device 5.
The desulfurization device 1 of the embodiment is provided with formed activated carbon c for desulfurization; the regeneration device 2 is used for regenerating the inactivated formed activated carbon c in the desulfurization device 1, the sulfur-containing material f generated during regeneration enters the acid preparation device 3, and sulfuric acid g is obtained from the acid preparation device 3; the regenerated fine particles h obtained by the regenerating device 2 are reused in the desulfurizing device 1; the regenerated coarse particles i obtained by the regenerating device 2 enter a modifying device 4; the modification device 4 is used for providing modified activated carbon j for the hydrolysis device 5, and the hydrolysis device 5 removes reduced sulfur by using the modified activated carbon j.
In this embodiment, the desulfurization device 1 and the regeneration device 2 are both fluidized bed reactors, the modification device 4 is a fixed bed reactor, and the hydrolysis device 5 is a moving bed reactor.
Comparative example 1
This comparative example provides a steel smelting gas treatment apparatus system as shown in fig. 2, which includes a desulfurization apparatus 1, a regeneration apparatus 2, and an acid making apparatus 3. In comparison with example 1, comparative example 1 is the same as example 1 except that the modification apparatus 4 and the hydrolysis apparatus 5 are removed from example 1.
The desulfurization apparatus 1 according to the present comparative example was provided with a shaped activated carbon c for desulfurization; the regeneration device 2 is used for regenerating the inactivated formed activated carbon c in the desulfurization device 1, the sulfur-containing material f generated during regeneration enters the acid preparation device 3, and sulfuric acid g is obtained from the acid preparation device 3; the regenerated fine particles h obtained by the regenerating device 2 are reused in the desulfurizing device 1; the regenerated coarse particles i obtained by the regeneration device 2 are burned as fuel.
In the comparative example, both the desulfurization unit 1 and the regeneration unit 2 were moving bed reactors.
Comparative example 2
This comparative example provides a steelmaking smelt gas treatment plant system as shown in figure 3, comprising a modification plant 4 and a hydrolysis plant 5. In comparative example 1, the desulfurization apparatus 1, the regeneration apparatus 2, and the acid production apparatus 3 were removed from example 1, and the remaining apparatuses were the same as example 1, as compared to example 1.
The modification apparatus 4 of this comparative example was used to supply the hydrolysis apparatus 5 with the modified activated carbon j, and the hydrolysis apparatus 5 removed the reduced sulfur using the modified activated carbon j.
The modification device 4 and the hydrolysis device 5 of the comparative example are both moving bed reactors.
Application example 1
The application example provides a method for desulfurizing a steel smelting gas and recycling sulfur by using the device system in the embodiment 1, and the method comprises the following steps:
(1) removing sulfur dioxide in the flue gas a by using formed activated carbon c prepared from coking coal to obtain saturated activated carbon d; the sulfur capacity of the formed activated carbon c for absorbing sulfur dioxide is 44mg/g, the wear-resisting strength is 97%, and the surface area is 300m2(ii)/g, particle diameter 7 mm;
(2) regenerating the saturated activated carbon d obtained in the step (1) by using superheated steam e at 450 ℃ to obtain regenerated activated carbon and sulfur-containing species f, and screening the regenerated activated carbon to obtain regenerated fine particles h with the particle size of less than or equal to 0.2mm and regenerated coarse particles i with the particle size of more than 0.2 mm; the sulphur-containing species f is used to produce sulphuric acid g;
(3) the regenerated fine particles h obtained in the step (2) are used for desulfurizing the flue gas a to obtain saturated fine particles m with the particle size of less than or equal to 0.2mm, and the saturated fine particles m are used for fuel combustion;
(4) performing alkali treatment on the regenerated coarse particles i obtained in the step (2) to remove carbonyl sulfide and hydrogen sulfide in the coal gas k to obtain saturated activated carbon, and screening the saturated activated carbon to obtain saturated fine particles m with the particle size of less than or equal to 0.2mm and saturated coarse particles n with the particle size of more than 0.2 mm; the alkaline solution used for the alkaline treatment is sodium carbonate; the concentration of the alkali solution is 5mol/L, the treatment temperature is 100 ℃, and the treatment time is 5 h; and (3) recycling the saturated coarse particles n to the step (2), and using the saturated fine particles m for fuel combustion.
The step (3) and the step (4) are not in sequence.
The contents of sulfur species in the purified flue gas b and the purified coal gas l obtained by the application example are analyzed and detected as shown in table 1.
Application example 2
The application example provides a method for desulfurizing a steel smelting gas and recycling sulfur by using the device system in the embodiment 1, and the method comprises the following steps:
(1) removing sulfur dioxide in the flue gas a by using formed activated carbon c prepared from semi coke to obtain saturated activated carbon d; the sulfur capacity of the formed activated carbon c for absorbing sulfur dioxide is 34mg/g, the wear-resisting strength is 96%, and the surface area is 250m2(iv)/g, particle diameter 6 mm;
(2) regenerating the saturated activated carbon d obtained in the step (1) by using superheated steam e at 425 ℃ to obtain regenerated activated carbon and a sulfur-containing species f, and screening the regenerated activated carbon to obtain regenerated fine particles h with the particle size of less than or equal to 0.2mm and regenerated coarse particles i with the particle size of more than 0.2 mm; the sulphur-containing species f is used to produce sulphuric acid g;
(3) the regenerated fine particles h obtained in the step (2) are used for desulfurizing the flue gas a to obtain saturated fine particles m with the particle size of less than or equal to 0.2mm, and the saturated fine particles m are used for fuel combustion;
(4) performing alkali treatment on the regenerated coarse particles i obtained in the step (2) to remove carbonyl sulfide and hydrogen sulfide in the coal gas k to obtain saturated activated carbon, and screening the saturated activated carbon to obtain saturated fine particles m with the particle size of less than or equal to 0.2mm and saturated coarse particles n with the particle size of more than 0.2 mm; the alkaline solution used for the alkaline treatment is potassium hydroxide; the concentration of the alkali solution is 2.5mol/L, the treatment temperature is 125 ℃, and the treatment time is 2.5 h; and (3) recycling the saturated coarse particles n to the step (2), and using the saturated fine particles m for fuel combustion.
The step (3) and the step (4) are not in sequence.
The contents of sulfur species in the purified flue gas b and the purified coal gas l obtained by the application example are analyzed and detected as shown in table 1.
Application example 3
The application example provides a method for desulfurizing a steel smelting gas and recycling sulfur by using the device system in the embodiment 1, and the method comprises the following steps:
(1) removing sulfur dioxide in the flue gas a by using formed activated carbon c prepared from coal to obtain saturated activated carbon d; the sulfur capacity of the formed activated carbon c for absorbing sulfur dioxide is 54mg/g, the wear-resisting strength is 98 percent, and the surface area is 350m2(iv)/g, particle diameter 8 mm;
(2) regenerating the saturated activated carbon d obtained in the step (1) by using superheated steam e at 475 ℃ to obtain regenerated activated carbon and sulfur-containing species f, and screening the regenerated activated carbon to obtain regenerated fine particles h with the particle size of less than or equal to 0.2mm and regenerated coarse particles i with the particle size of more than 0.2 mm; the sulphur-containing species f is used to produce sulphuric acid g;
(3) the regenerated fine particles h obtained in the step (2) are used for desulfurizing the flue gas a to obtain saturated fine particles m with the particle size of less than or equal to 0.2mm, and the saturated fine particles m are used for fuel combustion;
(4) performing alkali treatment on the regenerated coarse particles i obtained in the step (2) to remove carbonyl sulfide and hydrogen sulfide in the coal gas k to obtain saturated activated carbon, and screening the saturated activated carbon to obtain saturated fine particles m with the particle size of less than or equal to 0.2mm and saturated coarse particles n with the particle size of more than 0.2 mm; the alkaline solution used for the alkaline treatment is sodium bicarbonate; the concentration of the alkali solution is 7.5mol/L, the treatment temperature is 75 ℃, and the treatment time is 7.5 h; and (3) recycling the saturated coarse particles n to the step (2), and using the saturated fine particles m for fuel combustion.
The step (3) and the step (4) are not in sequence.
The contents of sulfur species in the purified flue gas b and the purified coal gas l obtained by the application example are analyzed and detected as shown in table 1.
Application example 4
The application example provides a method for desulfurizing a steel smelting gas and recycling sulfur by using the device system in the embodiment 1, and the method comprises the following steps:
(1) removing sulfur dioxide in the flue gas a by using formed activated carbon c prepared from coking coal to obtain saturated activated carbon d; the sulfur capacity of the formed activated carbon c for absorbing sulfur dioxide is 24mg/g, the wear-resisting strength is 95%, and the surface area is 200m2(iv)/g, particle diameter 5 mm;
(2) regenerating the saturated activated carbon d obtained in the step (1) by using superheated steam e at 400 ℃ to obtain regenerated activated carbon and a sulfur-containing species f, and screening the regenerated activated carbon to obtain regenerated fine particles h with the particle size of less than or equal to 0.2mm and regenerated coarse particles i with the particle size of more than 0.2 mm; the sulphur-containing species f is used to produce sulphuric acid g;
(3) the regenerated fine particles h obtained in the step (2) are used for desulfurizing the flue gas a to obtain saturated fine particles m with the particle size of less than or equal to 0.2mm, and the saturated fine particles m are used for fuel combustion;
(4) performing alkali treatment on the regenerated coarse particles i obtained in the step (2) to remove carbonyl sulfide and hydrogen sulfide in the coal gas k to obtain saturated activated carbon, and screening the saturated activated carbon to obtain saturated fine particles m with the particle size of less than or equal to 0.2mm and saturated coarse particles n with the particle size of more than 0.2 mm; the alkaline solution used for the alkaline treatment is sodium hydroxide; the concentration of the alkali solution is 1mol/L, the treatment temperature is 150 ℃, and the treatment time is 1 h; and (3) recycling the saturated coarse particles n to the step (2), and using the saturated fine particles m for fuel combustion.
The step (3) and the step (4) are not in sequence.
The contents of sulfur species in the purified flue gas b and the purified coal gas l obtained by the application example are analyzed and detected as shown in table 1.
Application example 5
The application example provides a method for desulfurizing a steel smelting gas and recycling sulfur by using the device system in the embodiment 1, and the method comprises the following steps:
(1) removing sulfur dioxide in the flue gas a by using formed activated carbon c prepared from semi coke to obtain saturated activated carbon d; the sulfur capacity of the formed activated carbon c for absorbing sulfur dioxide is 64mg/g, the wear-resisting strength is 99%, and the surface area is 200m2(iv)/g, particle diameter 9 mm;
(2) regenerating the saturated activated carbon d obtained in the step (1) by using superheated steam e at 500 ℃ to obtain regenerated activated carbon and a sulfur-containing species f, and screening the regenerated activated carbon to obtain regenerated fine particles h with the particle size of less than or equal to 0.2mm and regenerated coarse particles i with the particle size of more than 0.2 mm; the sulphur-containing species f is used to produce sulphuric acid g;
(3) the regenerated fine particles h obtained in the step (2) are used for desulfurizing the flue gas a to obtain saturated fine particles m with the particle size of less than or equal to 0.2mm, and the saturated fine particles m are used for fuel combustion;
(4) performing alkali treatment on the regenerated coarse particles i obtained in the step (2) to remove carbonyl sulfide and hydrogen sulfide in the coal gas k to obtain saturated activated carbon, and screening the saturated activated carbon to obtain saturated fine particles m with the particle size of less than or equal to 0.2mm and saturated coarse particles n with the particle size of more than 0.2 mm; the alkaline solution used for the alkaline treatment is potassium carbonate; the concentration of the alkali solution is 10mol/L, the treatment temperature is 50 ℃, and the treatment time is 10 h; and (3) recycling the saturated coarse particles n to the step (2), and using the saturated fine particles m for fuel combustion.
The step (3) and the step (4) are not in sequence.
The contents of sulfur species in the purified flue gas b and the purified coal gas l obtained by the application example are analyzed and detected as shown in table 1.
Application example 6
The application example provides a method for desulfurizing a steel smelting gas and recycling sulfur by using the device system in the embodiment 2, and the method comprises the following steps:
(1) removing sulfur dioxide in the flue gas a by using formed activated carbon c prepared from coking coal to obtain saturated activated carbon d; the sulfur capacity of the formed activated carbon c for absorbing sulfur dioxide is 44mg/g, the wear-resisting strength is 97%, and the surface area is 300m2(ii)/g, particle diameter 7 mm;
(2) regenerating the saturated activated carbon d obtained in the step (1) by using superheated steam e at 450 ℃ to obtain regenerated activated carbon and sulfur-containing species f, and screening the regenerated activated carbon to obtain regenerated fine particles h with the particle size of less than or equal to 0.2mm and regenerated coarse particles i with the particle size of more than 0.2 mm; the sulphur-containing species f is used to produce sulphuric acid g;
(3) the regenerated fine particles h obtained in the step (2) are used for desulfurizing the flue gas a to obtain saturated fine particles m with the particle size of less than or equal to 0.2mm, and the saturated fine particles m are used for fuel combustion;
(4) performing alkali treatment on the regenerated coarse particles i obtained in the step (2) to remove carbonyl sulfide and hydrogen sulfide in the coal gas k to obtain saturated activated carbon, and screening the saturated activated carbon to obtain saturated fine particles m with the particle size of less than or equal to 0.2mm and saturated coarse particles n with the particle size of more than 0.2 mm; the alkaline solution used for the alkaline treatment is sodium carbonate; the concentration of the alkali solution is 5mol/L, the treatment temperature is 100 ℃, and the treatment time is 5 h; and (3) recycling the saturated coarse particles n to the step (2), and using the saturated fine particles m for fuel combustion.
The step (3) and the step (4) are not in sequence.
The contents of sulfur species in the purified flue gas b and the purified coal gas l obtained by the application example are analyzed and detected as shown in table 1.
Application example 7
The application example provides a method for desulfurizing a steel smelting gas and recycling sulfur by using the device system in the embodiment 3, and the method comprises the following steps:
(1) removing sulfur dioxide in the flue gas a by using formed activated carbon c prepared from coking coal to obtain saturated activated carbon d; the sulfur capacity of the formed activated carbon c for absorbing sulfur dioxide is 44mg/g, the wear-resisting strength is 97%, and the surface area is 300m2(ii)/g, particle diameter 7 mm;
(2) regenerating the saturated activated carbon d obtained in the step (1) by using superheated steam e at 450 ℃ to obtain regenerated activated carbon and sulfur-containing species f, and screening the regenerated activated carbon to obtain regenerated fine particles h with the particle size of less than or equal to 0.2mm and regenerated coarse particles i with the particle size of more than 0.2 mm; the sulphur-containing species f is used to produce sulphuric acid g;
(3) the regenerated fine particles h obtained in the step (2) are used for desulfurizing the flue gas a to obtain saturated fine particles m with the particle size of less than or equal to 0.2mm, and the saturated fine particles m are used for fuel combustion;
(4) performing alkali treatment on the regenerated coarse particles i obtained in the step (2) to remove carbonyl sulfide and hydrogen sulfide in the coal gas k to obtain saturated activated carbon, and screening the saturated activated carbon to obtain saturated fine particles m with the particle size of less than or equal to 0.2mm and saturated coarse particles n with the particle size of more than 0.2 mm; the alkaline solution used for the alkaline treatment is sodium carbonate; the concentration of the alkali solution is 5mol/L, the treatment temperature is 100 ℃, and the treatment time is 5 h; and (3) recycling the saturated coarse particles n to the step (2), and using the saturated fine particles m for fuel combustion.
The step (3) and the step (4) are not in sequence.
The contents of sulfur species in the purified flue gas b and the purified coal gas l obtained by the application example are analyzed and detected as shown in table 1.
Comparative application example 1
This comparative application example provides a method for treating a steel smelting gas using the apparatus system of comparative example 1, the method comprising the steps of:
(1) removing sulfur dioxide in the flue gas a by using formed activated carbon c prepared from coking coal to obtain saturated activated carbon d; the sulfur capacity of the formed activated carbon c for absorbing sulfur dioxide is 44mg/g, the wear-resisting strength is 97%, and the surface area is 300m2(ii)/g, particle diameter 7 mm;
(2) regenerating the saturated activated carbon d obtained in the step (1) by using superheated steam e at 450 ℃ to obtain regenerated activated carbon and sulfur-containing species f, and screening the regenerated activated carbon to obtain regenerated fine particles h with the particle size of less than or equal to 0.2mm and regenerated coarse particles i with the particle size of more than 0.2 mm; the sulphur-containing species f is used to produce sulphuric acid g;
(3) and (3) the regenerated fine particles h obtained in the step (2) are used for desulfurizing the flue gas a to obtain saturated fine particles m with the particle size of less than or equal to 0.2mm, and the saturated fine particles m are used for fuel combustion.
The content of sulfur species in the purified flue gas b obtained by the application example is analyzed and detected as shown in table 1.
Comparative application example 2
This comparative application example provides a method of treating a steel smelting gas using the apparatus system of comparative example 2, the method comprising the steps of:
performing alkali treatment on formed activated carbon c prepared from coking coal, and removing carbonyl sulfide and hydrogen sulfide in coal gas k to obtain saturated activated carbon d, wherein the saturated activated carbon d is used for fuel combustion; the sulfur capacity of the formed activated carbon c for absorbing sulfur dioxide is 44mg/g, the wear-resisting strength is 97%, and the surface area is 300m2(ii)/g, particle diameter 7 mm; the alkaline solution used for the alkaline treatment is sodium carbonate; the concentration of the alkali solution is 5mol/L, the treatment temperature is 150 ℃, and the treatment time is 5 h.
The content of sulfur species in the purified gas l obtained by the application example is analyzed and detected as shown in table 1.
TABLE 1
The test method comprises the following steps: the method for testing the sulfur dioxide content in the flue gas comprises the steps of carrying out quantitative analysis on components in the gas by adopting an ultraviolet or infrared spectrum; the method for testing the contents of hydrogen sulfide and carbonyl sulfide in the coal gas is to analyze by adopting a gas chromatography matched with a sulfur-phosphorus detector.
As can be seen from the table: the application examples 1-7 show that the sulfur species in the purified flue gas and the purified coal gas reach the emission standard, and the device systems provided by the examples 1-3 can realize the cooperative treatment of the flue gas and the coal gas; the control to the flue gas can only be realized in comparison application example 1, and the control to the coal gas can only be realized in comparison application example 2, namely the device systems provided in comparison example 1 and comparison example 2 can not realize the cooperative control to the flue gas and the coal gas, and the function is single.
In conclusion, the method realizes the recycling of the activated carbon adsorption catalyst by regenerating the saturated activated carbon, reduces the adding times of fresh activated carbon, saves the treatment cost and improves the desulfurization efficiency of the steel smelting gas;the invention realizes the synergistic treatment of the flue gas and the coal gas, and the content of sulfur dioxide in the purified flue gas is reduced to minimum 10mg/m3The carbonyl sulfur content and the hydrogen sulfide content in the purified coal gas are both reduced to the minimum of 5mg/m3(ii) a Meanwhile, the sulfur resource treatment is combined, and the environmental protection and the economical efficiency of the steel smelting gas treatment are improved.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. A steel smelting gas desulfurization and sulfur recycling device system is characterized by comprising a desulfurization device, a regeneration device, an acid making device, a modification device and a hydrolysis device;
the desulfurization device is internally provided with formed activated carbon for desulfurization;
the regeneration device is used for regenerating the inactivated formed activated carbon in the desulfurization device, and sulfur-containing materials generated during regeneration enter the acid preparation device to obtain sulfuric acid; the regenerated fine particles obtained by the regeneration device are reused in the desulfurization device; feeding the regenerated coarse particles obtained by the regeneration device into a modification device;
the modification device is used for providing modified activated carbon for the hydrolysis device, and the hydrolysis device utilizes the modified activated carbon to remove reduced sulfur.
2. The system of claim 1, wherein the desulfurization unit is any one or a combination of at least two of a fixed bed reactor, a moving bed reactor, or a fluidized bed reactor;
preferably, the regeneration device is any one of a fixed bed reactor, a moving bed reactor or a fluidized bed reactor or a combination of at least two of the fixed bed reactor, the moving bed reactor and the fluidized bed reactor;
preferably, the modifying device is any one or a combination of at least two of a fixed bed reactor, a moving bed reactor and a fluidized bed reactor;
preferably, the hydrolysis device is any one of a fixed bed reactor, a moving bed reactor or a fluidized bed reactor or a combination of at least two of the fixed bed reactor, the moving bed reactor and the fluidized bed reactor.
3. A method for desulphurizing and recycling sulphur from steel smelting gas using the plant system according to claim 1 or 2, comprising the steps of:
(1) removing sulfur dioxide in the flue gas by using formed activated carbon to obtain saturated activated carbon;
(2) regenerating the saturated activated carbon obtained in the step (1) to obtain regenerated fine particles, regenerated coarse particles and a sulfur-containing material;
(3) the regenerated fine particles obtained in the step (2) are used for flue gas desulfurization to obtain saturated fine particles;
(4) modifying the regenerated coarse particles obtained in the step (2) to remove reduced sulfur in the coal gas to obtain saturated fine particles and saturated coarse particles;
the step (3) and the step (4) are not in sequence.
4. The method of claim 3, wherein the saturated coarse particles of step (4) are reused in step (2);
preferably, the saturated fine particles of step (3) and the saturated fine particles of step (4) are used for fuel combustion;
preferably, the sulfur-containing material of step (2) is used for preparing sulfuric acid.
5. The method according to claim 3 or 4, wherein the raw material for preparing the shaped activated carbon of step (1) comprises any one or a combination of at least two of coal, coking coal and semi-coke;
preferably, the sulfur capacity of the formed activated carbon in the step (1) for adsorbing sulfur dioxide is more than or equal to 24 mg/g;
preferably, the abrasion resistance strength of the formed activated carbon in the step (1) is more than or equal to 95 percent;
preferably, the surface area of the formed activated carbon in the step (1) is more than or equal to 200m2/g；
Preferably, the particle diameter of the formed activated carbon in the step (1) is more than or equal to 5 mm.
6. The method according to any one of claims 3 to 5, wherein the regeneration treatment of step (2) comprises superheated steam regeneration and/or high temperature nitrogen regeneration, further preferably superheated steam regeneration;
preferably, the temperature of the regeneration treatment is 400-.
7. The method according to any one of claims 3 to 6, wherein the modification treatment of step (4) is an alkali treatment;
preferably, the alkali solution used for the alkali treatment comprises any one or a combination of at least two of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate or potassium bicarbonate;
preferably, the concentration of the alkali solution is 1-10 mol/L;
preferably, the temperature of the alkali treatment is 50-150 ℃ and the time is 1-10 h.
8. The method according to any one of claims 3 to 7, wherein the reduced sulfur of step (4) is carbonyl sulfide and/or hydrogen sulfide.
9. The method according to any one of claims 3 to 8, wherein the regenerated fine particles of step (2) have a particle size of 0.2mm or less;
preferably, the particle size of the saturated fine particles in the step (3) and the particle size of the saturated fine particles in the step (4) are less than or equal to 0.2 mm;
preferably, the particle size of the regenerated coarse particles in the step (2) and the saturated coarse particles in the step (4) is more than 0.2 mm.
10. A method according to any of claims 3-9, characterized in that the method comprises the steps of:
(1) removing sulfur dioxide in flue gas by using formed activated carbon prepared by any one or combination of at least two of coal, coking coal and semi coke to obtain saturated activated carbon; the sulfur capacity of the formed active carbon for absorbing sulfur dioxide is more than or equal to 24mg/g, the wear-resisting strength is more than or equal to 95 percent, and the surface area is more than or equal to 200m2Per gram, the diameter of the particles is more than or equal to 5 mm;
(2) regenerating the saturated activated carbon obtained in the step (1) by using 400-plus 500-DEG C superheated steam to obtain regenerated activated carbon and a sulfur-containing material, and screening the regenerated activated carbon to obtain regenerated fine particles with the particle size of less than or equal to 0.2mm and regenerated coarse particles with the particle size of more than 0.2 mm; the sulfur-containing species is used to produce sulfuric acid;
(3) the regenerated fine particles obtained in the step (2) are used for flue gas desulfurization to obtain saturated fine particles with the particle size of less than or equal to 0.2mm, and the saturated fine particles are used for fuel combustion;
(4) the regenerated coarse particles obtained in the step (2) are subjected to alkali treatment and then used for removing carbonyl sulfide and/or hydrogen sulfide in coal gas to obtain saturated activated carbon, and the saturated activated carbon is screened to obtain saturated fine particles with the particle size of less than or equal to 0.2mm and saturated coarse particles with the particle size of more than 0.2 mm; the alkaline solution used for the alkaline treatment comprises any one or the combination of at least two of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate or potassium bicarbonate; the concentration of the alkali solution is 1-10mol/L, the treatment temperature is 50-150 ℃, and the treatment time is 1-10 h; recycling the saturated coarse particles to the step (2), and using the saturated fine particles for fuel combustion;
the step (3) and the step (4) are not in sequence.
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