CN111004652A - System and method for removing sulfur-containing compounds in blast furnace gas - Google Patents
System and method for removing sulfur-containing compounds in blast furnace gas Download PDFInfo
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- CN111004652A CN111004652A CN201911299374.7A CN201911299374A CN111004652A CN 111004652 A CN111004652 A CN 111004652A CN 201911299374 A CN201911299374 A CN 201911299374A CN 111004652 A CN111004652 A CN 111004652A
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- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
- C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
- C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
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- B01D53/48—Sulfur compounds
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- B01D53/34—Chemical or biological purification of waste gases
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- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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- B01D53/86—Catalytic processes
- B01D53/8603—Removing sulfur compounds
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- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
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- B01D53/8612—Hydrogen sulfide
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- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
- C10K1/12—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors
- C10K1/122—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors containing only carbonates, bicarbonates, hydroxides or oxides of alkali-metals (including Mg)
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Abstract
The invention discloses a system for removing sulfur-containing compounds in blast furnace gas, which comprises a desulfurizing tower and an alkali spraying tower, wherein the desulfurizing tower is connected with the alkali spraying tower in series, and the desulfurizing tower is positioned at the upstream of the alkali spraying tower; modified activated carbon is filled in the desulfurizing tower and is used for carrying out catalytic hydrolysis reaction with carbonyl sulfide in blast furnace gas introduced into the desulfurizing tower and adsorbing hydrogen sulfide in the blast furnace gas; a liquid spraying pipe is arranged in the alkali spraying tower and is used for spraying alkali liquor to blast furnace gas flowing out of the desulfurization tower and then introduced into the alkali spraying tower; solves the technical problem of high cost of the existing flue gas desulfurization process.
Description
Technical Field
The invention relates to the technical field of metallurgical environmental protection, in particular to a system and a method for removing sulfur-containing compounds in blast furnace gas.
Background
In the face of higher and higher environmental requirements, the industry is transformed and upgraded, the pollutant emission is reduced, and the improvement of the environmental quality is urgent. Blast furnace gas is the main fuel of blast furnace hot blast stoves at home and abroad at present. In the prior art, blast furnace gas is usually directly conveyed to a hot blast stove for use after dust removal and TRT power generation, and the rest part of the blast furnace gas is dechlorinated by an alkali spraying tower and then is applied to downstream, so that the emission of sulfur oxides in the flue gas of the hot blast stove exceeds the standard.
In the prior art, a rear-end desulfurization system is adopted to desulfurize flue gas to reduce the emission of sulfur oxides, and the cost is high.
Disclosure of Invention
The embodiment of the application solves the technical problem of high cost of the existing desulfurization process by providing a system and a method for removing sulfur-containing compounds in blast furnace gas.
On one hand, the present application provides the following technical solutions through an embodiment of the present application:
a system for removing sulfur-containing compounds in blast furnace gas comprises a desulfurization tower and an alkali spraying tower, wherein the desulfurization tower is connected with the alkali spraying tower in series, and the desulfurization tower is positioned at the upstream of the alkali spraying tower;
modified activated carbon is filled in the desulfurizing tower and is used for carrying out catalytic hydrolysis reaction with carbonyl sulfide in blast furnace gas introduced into the desulfurizing tower and adsorbing hydrogen sulfide in the blast furnace gas; wherein the modified activated carbon is an activated carbon catalyst modified by metal oxide prepared by an impregnation method;
and a liquid spraying pipe is arranged in the alkali spraying tower and is used for spraying alkali liquor to the blast furnace gas flowing out of the desulfurizing tower and then introduced into the alkali spraying tower.
Optionally, the metal element in the metal oxide is one or more of iron, manganese and titanium.
Optionally, the alkali liquor is sodium hydroxide solution, the temperature is 25-35 ℃, and the concentration is 0.5-1.0 mol/L.
Optionally, alkali spraying tower middle part sets up the multilayer spray tube, the multilayer spray tube includes:
the first layer of liquid spraying pipe is used for spraying the alkali liquor;
the second layer of liquid spraying pipe is arranged at the upper part of the first layer of liquid spraying pipe and is used for spraying the circulating solution recovered from the alkali spraying tower;
and the third layer of liquid spraying pipe is arranged at the upper part of the second layer of liquid spraying pipe and is used for spraying industrial water.
Optionally, the length of the liquid spraying pipe is 4/5-5/6 of the diameter of the alkali spraying tower, and 3-5 atomizing spray guns are uniformly arranged on each liquid spraying pipe at intervals.
Optionally, the top of the alkali spraying tower is further provided with:
and the demisting system is used for removing the mechanical water in the blast furnace gas sprayed with the alkali liquor through the liquid spraying pipe.
The washing system comprises a plurality of water spraying pipes, and 7-9 atomizing spray guns are arranged on the water spraying pipes and used for spraying desalted water.
Optionally, the lower parts of the desulfurizing tower and the alkali spraying tower are provided with gas distribution systems for guiding and distributing blast furnace gas.
Optionally, the bottom of the alkali spraying tower is communicated with an alkali solution pool for collecting the circulating solution flowing out of the alkali spraying tower and providing the circulating solution for the second layer of liquid spraying pipes.
Optionally, the desulfurizing tower includes a plurality of, and a plurality of desulfurizing tower is parallelly connected the back, with spout alkali tower is connected.
In another aspect, the present application provides a method for removing sulfur compounds from blast furnace gas, including:
enabling the blast furnace gas to pass through the desulfurization tower from bottom to top, enabling modified activated carbon in the desulfurization tower and carbonyl sulfide in the blast furnace gas to perform catalytic hydrolysis reaction, and adsorbing hydrogen sulfide in the blast furnace gas to obtain primary desulfurization blast furnace gas;
and (3) allowing the primary desulfurization blast furnace gas to pass through the alkali spraying tower from bottom to top, so that the alkali liquor sprayed in the alkali spraying tower absorbs the residual hydrogen sulfide and carbonyl sulfide in the primary desulfurization blast furnace gas, and obtaining the desulfurization blast furnace gas.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the system comprises a desulfurizing tower and an alkali spraying tower, wherein the desulfurizing tower is connected with the alkali spraying tower in series, and the desulfurizing tower is positioned at the upstream of the alkali spraying tower; modified activated carbon is filled in the desulfurizing tower and is used for carrying out catalytic hydrolysis reaction with carbonyl sulfide in blast furnace gas introduced into the desulfurizing tower and adsorbing hydrogen sulfide in the blast furnace gas; wherein the modified activated carbon is an activated carbon catalyst modified by metal oxide prepared by an impregnation method; and a liquid spraying pipe is arranged in the alkali spraying tower and is used for spraying alkali liquor to the blast furnace gas flowing out of the desulfurizing tower and then introduced into the alkali spraying tower. Because the temperature of blast furnace gas is only 60-80 ℃ before the blast furnace gas is introduced into the desulfurizing tower, the temperature can not reach the reaction temperature of the desulfurizing method in the prior art, the active carbon catalyst containing metal oxide modification and prepared by an impregnation method and filled in the desulfurizing tower can perform catalytic hydrolysis reaction with carbonyl sulfide in the blast furnace gas which is low in volume and high in volume, adsorb hydrogen sulfide in the blast furnace gas, and absorb most of the carbonyl sulfide and part of the hydrogen sulfide; at the moment, residual hydrogen sulfide and carbonyl sulfide in the blast furnace gas are absorbed by alkali liquor through an alkali liquor spraying tower, so that the aim of removing sulfur from the blast furnace gas is fulfilled. Because the front end is used for removing sulfur, the amount of the blast furnace gas at the front end is far less than that of the flue gas generated by burning the rear end, and the gas after sulfur removal meets the emission standard after burning through the front end sulfur removal system, and compared with the rear end for removing sulfur, the device has low cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a system for removing sulfur compounds from blast furnace gas in an embodiment of the present invention;
FIG. 2 is a schematic view of the gas distribution system of FIG. 1;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a top plan view of the sparge pipe and the flushing system of the soda tower of FIG. 1;
FIG. 5 is a schematic diagram of a system for removing sulfur compounds from blast furnace gas according to another embodiment of the present invention;
FIG. 6 is a flow chart of a method for removing sulfur compounds from blast furnace gas in an embodiment of the present invention;
in the figure, 1-a desulfurizing tower, 11-modified activated carbon, 12, 22-a coal gas distribution system, 121-a gas distribution grid, 122-a guide plate, 2-an alkali spraying tower, 21-a flushing system, 211-a water spray pipe, 23-a demisting system, 24-a third layer of liquid spray pipes, 241, 251, 261-a liquid spray pipe, 25-a second layer of liquid spray pipes, 26-a first layer of liquid spray pipes, 3-an alkali liquid pool and 4-an inlet flue.
Detailed Description
The embodiment of the application solves the technical problem of high cost of the existing desulfurization process by providing the system and the method for removing the sulfur-containing compounds in the blast furnace gas.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
a system for removing sulfur-containing compounds in blast furnace gas comprises a desulfurizing tower 1 and an alkali spraying tower 2, wherein the desulfurizing tower 1 is connected with the alkali spraying tower 2 in series, and the desulfurizing tower 1 is positioned at the upstream of the alkali spraying tower 2; modified activated carbon 11 is filled in the desulfurizing tower 1, and the modified activated carbon 11 is used for carrying out catalytic hydrolysis reaction with carbonyl sulfide in blast furnace gas introduced into the desulfurizing tower 1 and adsorbing hydrogen sulfide in the blast furnace gas; wherein the modified activated carbon 11 is an activated carbon catalyst modified by metal oxide prepared by an impregnation method; and a liquid spraying pipe 241, 251, 261 is arranged in the alkali spraying tower 2, and the liquid spraying pipe 241, 251, 261 is used for spraying alkali liquor to the blast furnace gas flowing out of the desulfurizing tower 1 and then introduced into the alkali spraying tower 2.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
First, it is stated that the term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
At present, various iron and steel enterprises temporarily do not have a process for desulfurizing blast furnace gas, and the flue gas generated after the blast furnace gas is used for combustion of a hot blast stove does not have corresponding desulfurization follow-up, if the flue gas is treated by rear end treatment, the desulfurization process of sintering pellet flue gas can be adopted, but the construction and maintenance costs are very high, and the flue gas desulfurization cost is higher due to the large amount of flue gas. Because the amount of blast furnace gas at the front end is small relative to the flue gas at the back end, the present application seeks to desulfurize the blast furnace gas at the front end. The research shows that the sulfur-containing compounds of the blast furnace gas after dust removal and TRT power generation are mainly carbonyl sulfur (COS) and hydrogen sulfide (H2S), wherein the former accounts for about 70 percent. Therefore, if the standard emission of the flue gas of the hot blast stove is to be realized, the system and the method for removing the sulfur-containing compounds in the blast furnace gas by the dry method need to be designed and invented, the sulfur-containing compounds in the blast furnace gas are removed, the clean gas is used as the fuel for burning the hot blast stove, the content of sulfur oxides in the flue gas is reduced, and the ultralow emission of the flue gas of the hot blast stove is realized.
Therefore, the present application provides the first embodiment and the second embodiment to solve the above problems. Specific examples will be described in detail below.
Example one
In the present embodiment, a system for removing sulfur-containing compounds from blast furnace gas is provided, referring to fig. 1, the system includes a desulfurization tower 1 and an alkali spraying tower 2, the desulfurization tower 1 is connected in series with the alkali spraying tower 2, and the desulfurization tower 1 is located upstream of the alkali spraying tower 2;
modified activated carbon 11 is filled in the desulfurizing tower 1, and the modified activated carbon 11 is used for carrying out catalytic hydrolysis reaction with carbonyl sulfide in blast furnace gas introduced into the desulfurizing tower 1 and adsorbing hydrogen sulfide in the blast furnace gas; wherein the modified activated carbon 11 is an activated carbon catalyst modified by metal oxide prepared by an impregnation method;
and a liquid spraying pipe 241, 251, 261 is arranged in the alkali spraying tower 2, and the liquid spraying pipe 241, 251, 261 is used for spraying alkali liquor to the blast furnace gas flowing out of the desulfurizing tower 1 and then introduced into the alkali spraying tower 2.
It should be noted that, as a gas treatment apparatus, both the desulfurization tower 1 and the soda blast tower 2 are preferably vertically installed, and are advanced and advanced, which is advantageous for sufficient treatment of blast furnace gas. However, the present application is not limited thereto, and the horizontal arrangement may be adopted, but the processing effect is inferior to that of the vertical arrangement.
Wherein, the desulfurizing tower 1 can be a fixed bed reactor, and as an optional implementation mode, the desulfurizing tower 1 can be arranged in parallel. Referring to fig. 5, the # 1 desulfurizing tower and the # 2 desulfurizing tower are connected in parallel and used alternately in a periodic manner, and the activated carbon with saturated adsorption is sent for regeneration treatment and recycling.
As an alternative embodiment, referring to fig. 1, the lower parts of the desulfurization tower 1 and the alkali-spraying tower 2 are provided with gas distribution systems 12, 22 for guiding and distributing blast furnace gas.
Specifically, as a specific embodiment, referring to fig. 2 and 3, the gas distribution system 12, 22 includes a guide plate 122 disposed on the inner wall of the desulfurization tower 1 or the alkali spraying tower 2, and a gas distribution grid 121 located above the guide plate 122, so that the blast furnace gas entering the desulfurization tower 1 or the alkali spraying tower 2 through the inlet flue 4 can be guided to the middle and then concentrated on the gas distribution grid 121 for gas distribution, so that the distribution of the blast furnace gas in the desulfurization tower 1 or the alkali spraying tower 2 is more uniform, and the treatment efficiency can be improved.
As a specific embodiment, the metal element in the metal oxide is one or more of iron, manganese and titanium. The activated carbon has higher active components, can perform good catalytic hydrolysis reaction with carbonyl sulfide in blast furnace gas introduced into the desulfurizing tower 1, and can adsorb hydrogen sulfide in the blast furnace gas.
In addition, as an optional structural arrangement mode, the top of the desulfurizing tower 1 is of a frustum cone structure, so that the flow guidance is facilitated; the outlet pipeline is connected with a downstream alkali spraying section, the bottom of the desulfurizing tower 1 is of a conical material receiving structure, material guiding is facilitated, and a discharging device and a conveying system are arranged below the desulfurizing tower.
As explained above, the bottom of the alkali spraying tower 2 is provided with the gas distribution systems 12 and 22.
As an alternative embodiment, the multiple layers of liquid spraying pipes 241, 251, 261 are arranged in the middle of the alkali spraying tower 2, and the liquid spraying pipes 241, 251, 261 are used for spraying alkali liquor, and are not limited, but for cost consideration and guarantee of desulfurization effect, the multiple layers of liquid spraying pipes 241, 251, 261 comprise:
a first layer of spraying tubes 241, 251, 26126 for spraying the alkali liquor;
a second layer liquid spraying pipe 241, 251, 26125 arranged on the upper part of the first layer liquid spraying pipe 241, 251, 26126 for spraying the recycle solution recovered from the alkali spraying tower 2;
and the third layer of liquid spraying pipes 241, 251 and 26124 are arranged at the upper parts of the second layer of liquid spraying pipes 241, 251 and 26125 and are used for spraying industrial water.
Specifically, referring to fig. 5, each layer of liquid spraying pipes 241, 251, 261 comprises a plurality of liquid spraying pipes 241, 251, 261, the length of the liquid spraying pipes 241, 251, 261 is 4/5-5/6 of the diameter of the alkali spraying tower 2, and 3-5 atomizing spray guns are uniformly arranged on each liquid spraying pipe 241, 251, 261 at intervals.
The alkali liquor is sodium hydroxide solution, the temperature is 25-35 ℃, and the concentration is 0.5-1.0 mol/L.
As an optional embodiment, the top of the alkali spraying tower 2 is further provided with:
and the demisting system 23 is used for removing mechanical water in the blast furnace gas sprayed with the alkali liquor through the liquid spraying pipe, and the demisting system 23 can be a wire mesh demister or a plate demister.
The washing system 21, see fig. 5, the washing system 21 includes a plurality of water spraying pipes 211, and 7-9 atomizing spray guns are disposed on the water spraying pipes 211 for spraying desalted water to periodically clean the defogging system 23.
The top of the alkali spraying tower 2 is of a cone structure, an outlet pipeline is connected with a downstream user, the bottom of the alkali spraying tower 2 is of a cone liquid containing structure, and a liquid drainage device and an alkali liquor pool 3 are arranged below the cone liquid containing structure. As an alternative embodiment, the bottom of the alkali-spraying tower 2 is communicated with an alkali solution pool 3 for collecting the circulating solution flowing out from the alkali-spraying tower 2 and providing the circulating solution for the second-layer liquid-spraying pipes 241, 251, 26125.
Each layer of liquid spraying pipes 241, 251 and 261 of the alkali spraying tower 2 are connected with a metering pump to pump various solutions; the solution comprises the normal-temperature alkali liquor, the circulating solution and the industrial water.
In consideration of safety, the gas outlet pipelines at the tops of the desulfurizing tower 1 and the alkali spraying tower 2 can be also provided with a bleeding valve.
The following describes the implementation principle in detail with reference to the specific structure of the above system.
Blast furnace gas at the temperature of about 60-80 ℃ after dry dedusting and TRT power generation enters the desulfurizing tower from the gas inlet section of the desulfurizing tower 1, and contacts with modified activated carbon 11 filled in the desulfurizing tower 1 through gas distribution systems 12 and 22 to realize carbonyl sulfide catalytic hydrolysis reaction and partial absorption of hydrogen sulfide; then discharged through an outlet pipeline at the top of the desulfurizing tower 1 and enters the alkali spraying tower 2 through an air inlet pipeline at the lower part of the alkali spraying tower 2. The blast furnace gas treated by the desulfurizing tower 1 is contacted with normal temperature alkali liquor sprayed into first layer liquid spraying pipes 241, 251 and 26126 (mainly to absorb hydrogen sulfide) through gas distribution systems 12 and 22 at the lower part of an alkali spraying tower 2, so as to further catalyze and hydrolyze unreacted carbonyl sulfide in the gas; then the residual hydrogen sulfide is contacted with the circulating solution sprayed into the second layer of liquid spraying pipes 241, 251 and 26125 in the tower to absorb the residual hydrogen sulfide; then the industrial water is contacted with the industrial water sprayed by a third layer of liquid spraying pipes 241, 251 and 26124 sprayed into the tower, the mechanical water is removed by a demisting system 23 after washing and purification, the industrial water leaves the alkali spraying tower 2 through an outlet pipeline at the top of the alkali spraying tower 2, and the treated purified blast furnace gas is used for combustion of a hot blast stove or other downstream users. The sulfur-containing compounds in the blast furnace gas are absorbed by alkali liquor, circulating solution or industrial water, discharged from the bottom of the alkali spraying tower 2 to an alkali liquor pool 3, and enter a circulating system or are discharged for treatment. The demisting system 23 at the top of the alkali spraying tower 2 is periodically flushed with desalted water to prevent blockage. The desulfurizing tower 1 is periodically and alternately used, and the active carbon with saturated adsorption is sent to regeneration treatment for recycling.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
the system of the embodiment comprises a desulfurizing tower 1 and an alkali spraying tower 2, wherein the desulfurizing tower 1 is connected with the alkali spraying tower 2 in series, and the desulfurizing tower 1 is located at the upstream of the alkali spraying tower 2; modified activated carbon 11 is filled in the desulfurizing tower 1, and the modified activated carbon 11 is used for carrying out catalytic hydrolysis reaction with carbonyl sulfide in blast furnace gas introduced into the desulfurizing tower 1 and adsorbing hydrogen sulfide in the blast furnace gas; wherein the modified activated carbon 11 is an activated carbon catalyst modified by metal oxide prepared by an impregnation method; and a liquid spraying pipe 241, 251, 261 is arranged in the alkali spraying tower 2, and the liquid spraying pipe 241, 251, 261 is used for spraying alkali liquor to the blast furnace gas flowing out of the desulfurizing tower 1 and then introduced into the alkali spraying tower 2. Because the temperature of the blast furnace gas is only 60-80 ℃ before the blast furnace gas is introduced into the desulfurizing tower 1, the temperature can not reach the reaction temperature of the desulfurizing method in the prior art, the active carbon catalyst containing metal oxide modification and prepared by an impregnation method and filled in the desulfurizing tower 1 can perform catalytic hydrolysis reaction with carbonyl sulfide in the blast furnace gas which is low in volume and high in volume, adsorb hydrogen sulfide in the blast furnace gas, and absorb most of the carbonyl sulfide and part of the hydrogen sulfide; at the moment, residual hydrogen sulfide and carbonyl sulfide in the blast furnace gas are absorbed by alkali liquor through the alkali liquor spraying tower 2, so that the purpose of removing sulfur from the blast furnace gas is achieved. Because the front end is used for removing sulfur, the amount of the blast furnace gas at the front end is far less than that of the flue gas generated by burning the rear end, and the gas after sulfur removal meets the emission standard after burning through the front end sulfur removal system, and compared with the rear end for removing sulfur, the device has low cost.
Example two
Based on the same inventive concept as the embodiments, the present embodiment provides a method for removing sulfur compounds from blast furnace gas, referring to fig. 6, the method comprising:
s101, enabling the blast furnace gas to pass through the desulfurization tower 1 from bottom to top, enabling modified activated carbon 11 in the desulfurization tower 1 to perform catalytic hydrolysis reaction with carbonyl sulfide in the blast furnace gas, and adsorbing hydrogen sulfide in the blast furnace gas to obtain primary desulfurization blast furnace gas;
s102, enabling the primary desulfurization blast furnace gas to pass through the alkali spraying tower 2 from bottom to top, and enabling alkali liquor sprayed in the alkali spraying tower 2 to absorb residual hydrogen sulfide and carbonyl sulfide in the primary desulfurization blast furnace gas to obtain the desulfurization blast furnace gas.
Since the method for removing sulfur compounds from blast furnace gas described in this embodiment is implemented by the system for removing sulfur compounds from blast furnace gas described in the first embodiment of this application, a specific implementation manner of the method described in this embodiment and various modifications thereof can be understood by those skilled in the art based on the system for removing sulfur compounds from blast furnace gas described in the first embodiment of this application, and therefore, how to implement the method described in this embodiment of this application by this system will not be described in detail herein. The method implemented by those skilled in the art based on the system for removing sulfur compounds from blast furnace gas in the first embodiment of the present application is within the scope of the present application.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The system for removing the sulfur-containing compounds in the blast furnace gas is characterized by comprising a desulfurization tower and an alkali spraying tower, wherein the desulfurization tower is connected with the alkali spraying tower in series, and the desulfurization tower is positioned at the upstream of the alkali spraying tower;
modified activated carbon is filled in the desulfurizing tower and is used for carrying out catalytic hydrolysis reaction with carbonyl sulfide in blast furnace gas introduced into the desulfurizing tower and adsorbing hydrogen sulfide in the blast furnace gas; wherein the modified activated carbon is an activated carbon catalyst modified by metal oxide prepared by an impregnation method;
and a liquid spraying pipe is arranged in the alkali spraying tower and is used for spraying alkali liquor to the blast furnace gas flowing out of the desulfurizing tower and then introduced into the alkali spraying tower.
2. The system of claim 1, wherein the metallic element in the metal oxide is one or more of iron, manganese, and titanium.
3. The system of claim 1, wherein the lye is a sodium hydroxide solution at a temperature of 25-35 ℃ and a concentration of 0.5-1.0 mol/L.
4. The system of claim 1 or 3, wherein a plurality of layers of liquid spraying pipes are arranged in the middle of the alkali spraying tower, and the plurality of layers of liquid spraying pipes comprise:
the first layer of liquid spraying pipe is used for spraying the alkali liquor;
the second layer of liquid spraying pipe is arranged at the upper part of the first layer of liquid spraying pipe and is used for spraying the circulating solution recovered from the alkali spraying tower;
and the third layer of liquid spraying pipe is arranged at the upper part of the second layer of liquid spraying pipe and is used for spraying industrial water.
5. The system of claim 4, wherein the length of the liquid spray pipes is 4/5-5/6 of the diameter of the alkali spray tower, and 3-5 atomizing spray guns are uniformly arranged on each liquid spray pipe at intervals.
6. The system of claim 1, wherein the top of the alkali spraying tower is further provided with:
the demisting system is used for removing the mechanical water in the blast furnace gas sprayed with the alkali liquor through the liquor spraying pipe;
the washing system comprises a plurality of water spraying pipes, and 7-9 atomizing spray guns are arranged on the water spraying pipes and used for spraying desalted water.
7. The system of claim 1, wherein the lower parts of the desulfurizing tower and the alkali spraying tower are provided with gas distribution systems for guiding and distributing blast furnace gas.
8. The system of claim 1, wherein the bottom of the alkali-spraying tower is communicated with an alkali solution pool for collecting the circulating solution flowing out of the alkali-spraying tower and providing the circulating solution for the second layer of liquid-spraying pipes.
9. The system of claim 1, wherein the desulfurization tower comprises a plurality of desulfurization towers, and the desulfurization towers are connected with the alkali spraying tower after being connected in parallel.
10. A method for removing sulfur-containing compounds from blast furnace gas is characterized by comprising the following steps:
making the blast furnace gas pass through the desulfurization tower of any one of claims 1-9 from bottom to top, performing catalytic hydrolysis reaction on the modified activated carbon in the desulfurization tower and carbonyl sulfide in the blast furnace gas, and adsorbing hydrogen sulfide in the blast furnace gas to obtain primary desulfurization blast furnace gas;
making the primary desulfurization blast furnace gas pass through the alkali spraying tower according to any one of claims 1 to 9 from bottom to top, and enabling alkali liquor sprayed in the alkali spraying tower to absorb residual hydrogen sulfide and carbonyl sulfide in the primary desulfurization blast furnace gas to obtain the desulfurization blast furnace gas.
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