CN111253984A - Blast furnace gas desulfurization device and method thereof - Google Patents
Blast furnace gas desulfurization device and method thereof Download PDFInfo
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- CN111253984A CN111253984A CN202010087437.9A CN202010087437A CN111253984A CN 111253984 A CN111253984 A CN 111253984A CN 202010087437 A CN202010087437 A CN 202010087437A CN 111253984 A CN111253984 A CN 111253984A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- 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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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- 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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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/34—Purifying combustible gases containing carbon monoxide by catalytic conversion of impurities to more readily removable materials
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Abstract
The invention discloses a blast furnace gas desulfurization device and a method thereof, wherein the device comprises a desulfurization tower which is a cavity, and the desulfurization tower sequentially comprises an air inlet section, a catalysis section and an absorption section from bottom to top; the tower wall of the gas inlet section is provided with a first hole, and the gas inlet section is communicated with a pipeline for providing blast furnace gas through the first hole; the catalytic section and the absorption section are respectively provided with a liquid spraying pipe; the absorption section is communicated with a blast furnace gas utilization device through a pipeline. The blast furnace gas is conveyed to a hot blast furnace or a heating furnace for use after being subjected to desulfurization treatment by adopting the method, the requirement of ultralow emission is met, and the method can replace an alkali spraying dechlorination tower and save the cost.
Description
Technical Field
The invention belongs to the technical field of metallurgical environmental protection, and particularly relates to a blast furnace gas desulfurization device and a method thereof.
Background
Blast furnace gas is a combustible byproduct obtained in the blast furnace ironmaking production process and is a main fuel of hot blast stoves and heating furnaces at home and abroad at present. Generally, after dust removal and TRT (blast furnace gas pressure recovery turbine) residual pressure power generation, most blast furnace gas is sent to a hot blast stove, a heating furnace and the like to be used as fuels, and the rest blast furnace gas is dechlorinated by an alkali spraying tower and then is applied to downstream.
In the face of increasingly severe environment protection situation, the steel industry promulgates and implements ultralow emission standards, and currently, Jingjin Ji areas, especially Tangshan areas, implement ultralow emission limits and require burning tail gas SO2Ultra-low emission limits are reached. At present, hot blast stoves and heating furnaces of iron and steel enterprises have fresh flue gas with corresponding desulfurization equipment and newly-built flue gas desulfurization equipment, and have the disadvantages of high investment, high operating cost, poor economy and poor practicability. In view of the above-mentioned end-of-line remediation infeasibility, it is therefore considered to control SO from the source2And (4) discharging the amount. The research shows that the blast furnace gas contains sulfur compounds, mainly organic carbonyl sulfide (COS) and inorganic hydrogen sulfide (H)2S), the latter being about 30% and easily removable. The organic carbonyl sulfide accounts for about 70 percent, and the carbonyl sulfide is the key of exceeding the standard of sulfur oxides in flue gas of a hot blast stove, a heating furnace and the like.
Therefore, there is an urgent need forResearch a new technology to solve the problem of flue gas SO after combustion caused by high carbonyl sulfide content in blast furnace gas serving as fuel of a hot blast furnace and a heating furnace2And (5) exceeding the standard.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a blast furnace gas desulfurization device and a blast furnace gas desulfurization method, which aim to solve the problem that the content of carbonyl sulfide in blast furnace gas serving as fuel of a hot blast furnace and a heating furnace in the prior art is high, so that the content of sulfur oxide in flue gas after combustion is high.
The invention realizes the purpose through the following technical scheme:
in one aspect, the invention provides a blast furnace gas desulfurization device, which comprises a desulfurization tower, wherein the desulfurization tower is a cavity,
the desulfurizing tower sequentially comprises an air inlet section, a catalytic section and an absorption section from bottom to top;
the tower wall of the gas inlet section is provided with a first hole, and the gas inlet section is communicated with a pipeline for providing blast furnace gas through the first hole;
the catalytic section and the absorption section are respectively provided with a liquid spraying pipe;
the absorption section is communicated with a blast furnace gas utilization device through a pipeline.
Further, the desulfurizing tower still includes the gas distribution section, the gas distribution section set up in the section of admitting air with between the catalysis section, the gas distribution section includes guide plate and bracing piece, the guide plate interval sets up, the guide plate has a plurality ofly, the guide plate is the arc, the one end of guide plate with the inner wall of desulfurizing tower is connected, the other end of guide plate is unsettled, the guide plate passes through the bracing piece and supports, the bracing piece has a plurality ofly, the one end of bracing piece with the guide plate is connected, the other end of bracing piece with the inner wall of desulfurizing tower is connected.
Furthermore, the desulfurizing tower also comprises a washing section, a demisting section, a washing section and a liquid discharge section, wherein the washing section, the demisting section and the washing section are sequentially arranged from bottom to top, the washing section is arranged at the upper part of the absorption section, the washing section is communicated with a blast furnace gas utilization device through a pipeline,
the washing section and the flushing section are respectively provided with a liquid spraying pipe;
the demisting section comprises a plurality of steel wire meshes and fillers, the edges of the plurality of steel wire meshes are connected with the inner wall of the desulfurizing tower, and the fillers are arranged between two adjacent steel wire meshes;
the liquid discharge section is arranged at the lower part of the air inlet section, the liquid discharge section is conical, and a liquid discharge valve is arranged at the vertex angle of the conical shape.
Further, catalysis section, absorption section, washing section and washing section are provided with the second hole respectively, the second hole has a plurality ofly, the spray tube has many, the spray tube interval sets up, be provided with the nozzle on the spray tube, the nozzle has a plurality ofly, the nozzle interval sets up.
Further, spray tube one end is passed through the detachable intercommunication of second hole with external pipeline, spray tube's the other end with the tower wall of desulfurizing tower is connected, spray tube's the other end seals.
Further, the one end of hydrojet pipe is passed through the detachable intercommunication of second hole and external pipeline, the other end of hydrojet pipe is unsettled, the hydrojet pipe with the axle center of desulfurizing tower is radial distribution setting as the center, the hydrojet pipe is connected with the ring, the ring has a plurality ofly, and is a plurality of the ring uses the axle center of desulfurizing tower is the center.
In another aspect, the present invention provides a method for desulfurizing blast furnace gas using the above-mentioned blast furnace gas desulfurization apparatus, comprising,
contacting blast furnace gas with alkali liquor for catalytic hydrolysis; the temperature of the alkali liquor is 40-50 ℃, and the concentration of the alkali liquor is 0.5-1.0 mol/L;
and contacting the blast furnace gas subjected to catalytic hydrolysis with an absorption liquid to perform absorption reaction to obtain the desulphurized blast furnace gas.
Further, the temperature of the blast furnace gas is 60-80 ℃.
Further, the alkali liquor is a sodium hydroxide solution or a potassium hydroxide solution, the absorption liquid is a sodium hydroxide solution or a potassium hydroxide solution, and the temperature of the absorption liquid is 10-35 ℃.
Further, the blast furnace gas after catalytic hydrolysis is contacted with an absorption solution to carry out absorption reaction to obtain the desulphurized blast furnace gas, which comprises,
contacting the blast furnace gas after catalytic hydrolysis with an absorption liquid to perform absorption reaction;
and washing and removing liquid from the blast furnace gas after the absorption reaction in sequence to obtain the desulphurized blast furnace gas.
The beneficial effects of the invention at least comprise:
the invention provides a blast furnace gas desulfurization device and a method thereof, wherein the device comprises a desulfurization tower, the desulfurization tower is a cavity, and the desulfurization tower sequentially comprises an air inlet section, a catalysis section and an absorption section from bottom to top; the tower wall of the gas inlet section is provided with a first hole, and the gas inlet section is communicated with a pipeline for providing blast furnace gas through the first hole; the catalytic section and the absorption section are respectively provided with a plurality of liquid spraying pipes, and the plurality of liquid spraying pipes are arranged at intervals; the absorption section is communicated with a blast furnace gas utilization device through a pipeline. The alkali liquor flows out of the liquid spraying pipe of the catalytic section in the device and contacts with the blast furnace gas, the alkali liquor can promote the hydrolysis reaction of carbonyl sulfide in the blast furnace gas to obtain hydrogen sulfide gas, the hydrogen sulfide gas contacts with the absorption liquid flowing out of the liquid spraying pipe of the absorption section and is absorbed into hydrogen sulfate liquid to be removed, the blast furnace gas without carbonyl sulfide is used for combustion and utilization of a hot blast stove and a heating furnace, and sulfide in the discharged flue gas is extremely low, so that the ultralow emission standard is reached.
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 will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a blast furnace gas desulfurization apparatus according to an embodiment of the present invention;
FIG. 2 is a front view of a gas distribution section of an embodiment of the invention;
FIG. 3 is a top view of the gas distribution section of FIG. 2;
FIG. 4 is a top view of a demisting section in accordance with an embodiment of the present invention;
FIG. 5 is a front view of FIG. 4;
FIG. 6 is a schematic diagram of the sparger distributions for the catalytic section, absorption section, scrubbing section, and washing section of an embodiment of the present invention;
FIG. 7 is a schematic diagram of yet another spray tube distribution for the catalytic section, absorption section, scrubbing section, and rinse section of an embodiment of the present invention;
fig. 8 is a process step diagram of a blast furnace gas desulfurization method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the technical scheme in the embodiment of the invention has the following general idea:
on one hand, an embodiment of the present invention provides a blast furnace gas desulfurization device, and fig. 1 is a schematic structural view of the blast furnace gas desulfurization device according to the embodiment of the present invention, and with reference to fig. 1, the device includes a desulfurization tower 13, where the desulfurization tower 13 is a cavity, and the desulfurization tower 13 sequentially includes, from bottom to top, an air intake section 2, a catalytic section 4, and an absorption section 5;
a first hole is formed in the tower wall of the gas inlet section 2, and the gas inlet section 2 is communicated with a pipeline for supplying blast furnace gas through the first hole;
the catalytic section 4 and the absorption section 5 are respectively provided with a liquid spraying pipe 10;
the absorption section is communicated with a blast furnace gas utilization device through a pipeline.
The blast furnace gas entering from the gas inlet section 2 flows from bottom to top along the desulfurizing tower, the alkali liquor flowing out from the liquid spraying pipe 10 of the catalytic section 4 is contacted with the blast furnace gas, carbonyl sulfide in the blast furnace gas is subjected to hydrolysis reaction under the action of the alkali liquor to generate hydrogen sulfide gas, the generated hydrogen sulfide gas moves upwards and is subjected to absorption reaction with the absorption liquid flowing out from the liquid spraying pipe 10 of the absorption section 5, the hydrogen sulfide gas is converted into hydrogen sulfuric acid, the carbonyl sulfide in the blast furnace gas is removed, the blast furnace gas without the carbonyl sulfide is used for combustion of a hot blast stove and a heating furnace, and the discharged flue gas sulfide is extremely low and reaches the ultralow emission standard.
Further, the desulfurizing tower 13 further includes a gas distribution section 3, fig. 2 is a front view of the gas distribution section according to the embodiment of the present invention, fig. 3 is a top view of the gas distribution section of fig. 2, and it can be seen from fig. 2 and 3 that the gas distribution section 3 is disposed between the gas inlet section 2 and the catalytic section 4, the gas distribution section 3 includes a plurality of flow deflectors 3-2 and support rods 3-1, the flow deflectors 3-2 are provided in plural, the flow deflectors 3-2 are all arc-shaped, one end of the flow deflector 3-2 is connected to the inner wall of the desulfurizing tower, the other end of the flow deflector 3-2 is suspended, the flow deflector 3-2 is supported by the support rods 3-1, the support rods 3-1 are provided in plural, one end of the support rods 3-1 is connected to the flow deflector 3-2, the other end of the support rod 3-1 is connected with the inner wall of the desulfurizing tower 13.
The guide plate 3-2 of the gas distribution section 3 can guide the blast furnace gas to move along the desulfurizing tower 13 from bottom to top, otherwise, the blast furnace gas enters from a pipeline vertical to the desulfurizing tower 13 and can impact the tower wall of the desulfurizing tower 13.
Further, the desulfurizing tower 13 also comprises a washing section 6, a demisting section 7, a washing section 8 and a liquid discharge section 1,
the washing section 6, the demisting section 7 and the washing section 8 are sequentially arranged from bottom to top, the washing section 6 is arranged at the upper part of the absorption section 5, the washing section 6 is communicated with a blast furnace gas utilization device through a pipeline, and the washing section 6 and the washing section 8 are respectively provided with a liquid spraying pipe 10; fig. 4 is a top view of a demisting section according to an embodiment of the present invention, and fig. 5 is a front view of fig. 4, in which, with reference to fig. 4 and 5, the demisting section 7 includes a plurality of steel wire meshes 14 and fillers, where the plurality of steel wire meshes 14 are connected to edges of the plurality of steel wire meshes 14, and the fillers are disposed between two adjacent steel wire meshes 14; the liquid discharge section 1 is arranged at the lower part of the air inlet section 2, the liquid discharge section 1 is conical, and a liquid discharge valve 1-1 is arranged at the vertex angle of the conical shape.
The blast furnace gas absorbed by the absorption liquid sprayed by the absorption section 5 also contains a certain amount of hydrogen sulfide gas and alkali liquor, and the residual hydrogen sulfide gas can be converted into hydrosulfuric acid by washing with desalted water sprayed by the nozzle 11 of the washing section 6, and the alkali liquor carried by the catalysis section 4 is washed away, so that the alkali liquor is prevented from corroding pipelines. The demisting section 7 can remove the mechanical water in the washed blast furnace gas and prevent the hydrogen sulfuric acid carried in the blast furnace gas from corroding the pipeline. Demisting section 7 long-term operation may cause the jam problem, need wash demisting section 7 when blast furnace minor overhaul, well overhaul or regular use wash section 8, and the water of washing can adopt the desalinized water.
The lowest part of the desulfurizing tower 13 is a cone, liquid sprayed by the catalytic section 4, the absorption section 5, the washing section 6 and the flushing section 8 flows into the liquid discharge section from top to bottom after acting with blast furnace gas, and when the liquid level of the liquid discharge section reaches 1/2 of the height of the cone, a liquid discharge valve 1-1 is opened to realize liquid discharge; when the liquid level of the liquid discharge section is reduced to 1/6 with the height of the cone, the liquid discharge valve 1-1 is closed, liquid discharge is stopped, the liquid in the liquid discharge section cannot be completely discharged, and the leakage of the blast furnace gas is prevented; when the liquid level of the liquid discharge section reaches 2/3 of the height of the cone, liquid is not discharged, the system automatically alarms to prompt that the liquid discharge valve 1-1 is abnormally opened and needs to be manually overhauled. The drain valve 1-1 is the prior art, and all valves capable of realizing the functions can be used in the invention.
The uppermost end of the pipeline communicated with the flushing section 8 can be provided with a bleeding valve 9, so that the safety problem is ensured.
Further, the catalysis section 4, the absorption section 5, the washing section 6 and the washing section 8 are respectively provided with a plurality of second holes, the plurality of liquid spraying pipes 10 are arranged at intervals, the liquid spraying pipes 10 are provided with a plurality of nozzles 11, the plurality of nozzles 11 are arranged at intervals, and the nozzles 11 are arranged at intervals.
Further, fig. 6 is a schematic diagram of the distribution of the liquid spraying pipes of the catalytic section, the absorption section, the washing section and the rinsing section according to the embodiment of the present invention, and referring to fig. 6, one end of the liquid spraying pipe 10 is detachably communicated with an external pipeline through the second hole, the other end of the liquid spraying pipe 10 is connected with the tower wall of the desulfurization tower 13, and the other end of the liquid spraying pipe 10 is closed. The liquid in the liquid spray pipe 10 flows in from an external pipeline, and the liquid is sprayed into the desulfurizing tower 13 along the nozzle 11 of the liquid spray pipe 10 to react with the blast furnace gas. The other end of the liquid spraying pipe 10 is closed, so that the pressure of the liquid in the liquid spraying pipe 10 can be increased, the liquid presents trickle or fog and is in contact reaction with blast furnace gas, the reaction area is increased, and the reaction rate is increased.
Further, fig. 7 is a schematic diagram of a distribution of the liquid spraying pipes of the catalytic section, the absorption section, the washing section and the rinsing section according to an embodiment of the present invention, and referring to fig. 7, one end of the liquid spraying pipe 10 is detachably connected to an external pipeline through the second hole, the other end of the liquid spraying pipe 10 is suspended, the liquid spraying pipes 10 are radially distributed and arranged with the axis of the desulfurization tower 13 as a center, the liquid spraying pipe 10 is connected to a plurality of rings 12, and the plurality of rings 12 are centered with the axis of the desulfurization tower 13. The liquid in the external pipeline enters from one end of the liquid spraying pipe 10 and is sprayed out along the nozzle 11 on the liquid spraying pipe 10 to act with the blast furnace gas in the desulfurizing tower 13.
In order to improve the desulfurization effect of the blast furnace gas, a plurality of desulfurization towers may be connected in series after the desulfurization tower, the internal structure of the desulfurization tower connected in series may be the same as that of the desulfurization tower described above, and if the amount of tasks for desulfurization is reduced, the internal structure may be simplified, for example, a catalytic section is not provided.
In another aspect, the present invention provides a blast furnace gas desulfurization method, and fig. 8 is a process step diagram of a blast furnace gas desulfurization method according to an embodiment of the present invention, which is combined with fig. 8, the method includes,
and S1, contacting the blast furnace gas with alkali liquor to perform catalytic hydrolysis.
The temperature of the alkali liquor is 40-50 ℃, and the concentration of the solution of the alkali liquor is 0.5-1.0 mol/L.
The blast furnace gas contains a large amount of carbonyl sulfide, and the carbonyl sulfide is subjected to hydrolysis reaction under the catalysis of the alkali liquor with the temperature and the concentration to generate hydrogen sulfide gas. The hydrolysis reaction of carbonyl sulfide is endothermic reaction, the lower limit of the temperature of the alkali liquor is controlled to be 40 ℃, the hydrolysis reaction can be promoted to be carried out in the positive direction, and the on-line is controlled to be 50 ℃ in consideration of the cost problem because the heating of the alkali liquor requires energy.
Further, the temperature of the blast furnace gas is 60-80 ℃.
The temperature of the blast furnace gas after dust removal and TRT pressure power generation is about 60-80 ℃, on one hand, the high temperature of the blast furnace gas is beneficial to catalytic hydrolysis of carbonyl sulfide, on the other hand, the blast furnace gas is in contact with alkali liquor, and can also transfer heat to the alkali liquor, so that the problem of the alkali liquor is solved, and the catalytic and hydrolysis reactions are promoted.
Further, the alkali liquor is sodium hydroxide solution or potassium hydroxide solution.
The sodium hydroxide solution and the potassium hydroxide solution can improve the hydrolysis reaction of carbonyl sulfide.
And S2, contacting the blast furnace gas after catalytic hydrolysis with an absorption liquid to perform an absorption reaction.
The blast furnace gas after catalytic hydrolysis contains a large amount of hydrogen sulfide gas, the hydrogen sulfide gas is easily dissolved in water, and the hydrogen sulfide gas can be changed into a hydrogen sulfuric acid solution by contacting the hydrogen sulfide gas with absorption liquid.
Further, the absorption liquid is a sodium hydroxide solution or a potassium hydroxide solution, and the temperature of the absorption liquid is 10-35 ℃.
The absorption liquid adopts sodium hydroxide solution or potassium hydroxide solution, so that hydrogen sulfide gas can be changed into hydrosulfuric acid, and the hydrogen sulfide gas can be subjected to neutralization reaction with the hydrosulfuric acid to convert sulfur into salt, thereby promoting the absorption of the hydrogen sulfide gas and improving the absorption efficiency of the hydrogen sulfide gas.
And S3, washing and removing the blast furnace gas after the absorption reaction in sequence to obtain the desulphurized blast furnace gas.
The washing can remove alkali liquor in the blast furnace gas after the absorption reaction, and prevent the alkali liquor from corroding the pipeline. The liquid removing agent can remove the hydrogen sulfuric acid in the blast furnace gas after being washed in sequence, so that the acid liquor is prevented from corroding the pipeline.
The invention provides a blast furnace gas desulphurization device and a method thereof, wherein alkali liquor is used as a catalyst to promote the hydrolysis reaction of carbonyl sulfide, so that the carbonyl sulfide reacts with water to be converted into hydrogen sulfide gas which is easily dissolved in water, therefore, the hydrogen sulfide gas is converted into hydrogen sulfuric acid after contacting with absorption liquid, the carbonyl sulfide in the blast furnace gas is removed, the blast furnace gas without the carbonyl sulfide is used for combustion of a hot blast stove and a heating furnace, the sulfide in the discharged flue gas is extremely low, and the ultralow emission standard is achieved.
The device and the method have the advantages that HCl gas in the flue gas can be removed, iron ore, sinter and coal powder which are used as raw materials for blast furnace ironmaking of iron and steel enterprises contain impurities Cl, most of Cl is converted into hydrogen chloride gas and is discharged along with the flue gas, dust and the like, at present, an alkali spraying dechlorination tower is adopted to remove hydrogen chloride, carbonyl sulfide in the blast furnace gas can be removed, the hydrogen chloride gas can be removed, the alkali spraying dechlorination tower of the iron and steel enterprises is omitted, and the cost is saved.
The technical solution of the present invention will be further described with reference to specific examples.
Examples 1 to 3 provide a method for desulfurizing blast furnace gas, comprising,
and S1, contacting the blast furnace gas with alkali liquor to perform catalytic hydrolysis.
Further, the temperature of the alkali liquor is 40-50 ℃, and the concentration of the solution of the alkali liquor is 0.5-1.0 mol/L.
Further, the temperature of the blast furnace gas is 60-80 ℃.
Further, the alkali liquor is sodium hydroxide solution or potassium hydroxide solution.
S2, contacting the blast furnace gas after catalytic hydrolysis with an absorption liquid to perform an absorption reaction;
further, the absorption liquid is a sodium hydroxide solution or a potassium hydroxide solution, and the temperature of the absorption liquid is 10-35 ℃.
And S3, washing and removing the blast furnace gas after the absorption reaction in sequence to obtain the desulphurized blast furnace gas.
Examples 1 to 3 the control of the process parameters during the removal of blast furnace gas is given in table 1.
TABLE 1
Comparative example 1
Comparative example 1 blast furnace gas in the prior art is directly conveyed to a heating furnace or a hot blast stove for use after being subjected to dust removal and TRT (blast furnace gas pressure recovery) residual pressure power generation.
TABLE 2
| Item | SO2Content of (1), mg/m3 | SO2Ultra-low emission standard, mg/m3 |
| Example 1 | 20 | ≤50 |
| Example 2 | 30 | ≤50 |
| Example 3 | 25 | ≤50 |
| Comparative example 1 | 85 | ≤50 |
Table 2 shows the use of the desulfurized blast furnace gas obtained in examples 1 to 3 in hot blast stoves, the SO in the flue gas emitted by the stoves2Content of (1) and comparative example 1 blast furnace gas after dust removal and TRT residual pressure power generation is directly conveyed to SO in flue gas used by hot blast stove2The content of (a).
According to the data in table 2, it can be known that the blast furnace gas treated by the embodiment of the invention is used for the hot blast stove, and the discharged flue gas reaches the ultralow emission standard. The untreated blast furnace gas of comparative example 1 was out of specification and could not be discharged.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
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 blast furnace gas desulfurization device is characterized by comprising a desulfurization tower which is a cavity,
the desulfurizing tower sequentially comprises an air inlet section, a catalytic section and an absorption section from bottom to top;
the tower wall of the gas inlet section is provided with a first hole, and the gas inlet section is communicated with a pipeline for providing blast furnace gas through the first hole;
the catalytic section and the absorption section are respectively provided with a liquid spraying pipe;
the absorption section is communicated with a blast furnace gas utilization device through a pipeline.
2. The blast furnace gas desulfurization device according to claim 1, wherein the desulfurization tower further comprises a gas distribution section, the gas distribution section is arranged between the gas inlet section and the catalytic section, the gas distribution section comprises a plurality of flow guide plates and a plurality of support rods, the flow guide plates are arranged at intervals, the flow guide plates are all arc-shaped, one ends of the flow guide plates are connected with the inner wall of the desulfurization tower, the other ends of the flow guide plates are suspended, the flow guide plates are supported by the support rods, the plurality of support rods are arranged, one ends of the support rods are connected with the flow guide plates, and the other ends of the support rods are connected with the inner wall of the desulfurization tower.
3. The blast furnace gas desulfurization device according to claim 1, wherein the desulfurization tower further comprises a washing section, a demisting section, a washing section and a liquid discharge section, the washing section, the demisting section and the washing section are sequentially arranged from bottom to top, the washing section is arranged at the upper part of the absorption section, the washing section is communicated with the blast furnace gas utilization device through a pipeline,
the washing section and the flushing section are respectively provided with a liquid spraying pipe;
the demisting section comprises a plurality of steel wire meshes and fillers, the edges of the plurality of steel wire meshes are connected with the inner wall of the desulfurizing tower, and the fillers are arranged between two adjacent steel wire meshes;
the liquid discharge section is arranged at the lower part of the air inlet section, the liquid discharge section is conical, and a liquid discharge valve is arranged at the vertex angle of the conical shape.
4. The blast furnace gas desulfurization apparatus according to claim 1 or 3, wherein the catalytic section, the absorption section, the washing section and the washing section are each provided with a plurality of second holes, the plurality of liquid ejection tubes are provided at intervals, and the liquid ejection tubes are provided with a plurality of nozzles at intervals.
5. The blast furnace gas desulfurization device according to claim 4, wherein one end of the liquid injection pipe is detachably communicated with an external pipeline through the second hole, the other end of the liquid injection pipe is connected with the tower wall of the desulfurization tower, and the other end of the liquid injection pipe is closed.
6. The blast furnace gas desulfurization device according to claim 4, wherein one end of the liquid injection pipe is detachably connected to an external pipe through the second hole, the other end of the liquid injection pipe is suspended, the liquid injection pipes are radially distributed around the axis of the desulfurization tower, the liquid injection pipe is connected to a plurality of rings, and the plurality of rings are centered around the axis of the desulfurization tower.
7. The method for desulfurizing a blast furnace gas using the blast furnace gas desulfurization apparatus according to any one of claims 1 to 6, characterized by comprising,
contacting blast furnace gas with alkali liquor for catalytic hydrolysis; the temperature of the alkali liquor is 40-50 ℃, and the concentration of the alkali liquor is 0.5-1.0 mol/L;
and contacting the blast furnace gas subjected to catalytic hydrolysis with an absorption liquid to perform absorption reaction to obtain the desulphurized blast furnace gas.
8. The method for desulfurizing blast furnace gas according to claim 7, wherein the temperature of the blast furnace gas is 60 to 80 ℃.
9. The method for desulfurizing blast furnace gas according to claim 7, wherein the alkali solution is a sodium hydroxide solution or a potassium hydroxide solution, the absorption solution is a sodium hydroxide solution or a potassium hydroxide solution, and the temperature of the absorption solution is 10-35 ℃.
10. The blast furnace gas desulfurization method according to claim 7, wherein the blast furnace gas after the catalytic hydrolysis is brought into contact with an absorption solution to undergo an absorption reaction to obtain a desulfurization blast furnace gas, comprising,
contacting the blast furnace gas after catalytic hydrolysis with an absorption liquid to perform absorption reaction;
and washing and removing liquid from the blast furnace gas after the absorption reaction in sequence to obtain the desulphurized blast furnace gas.
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| CN111748382A (en) * | 2020-07-10 | 2020-10-09 | 济南环陶环保工程有限公司 | Blast furnace gas fine desulfurization integrated equipment |
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