CN115011382A - Blast furnace gas desulfurization and regeneration integrated tower and application thereof - Google Patents
Blast furnace gas desulfurization and regeneration integrated tower and application thereof Download PDFInfo
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- CN115011382A CN115011382A CN202210843124.0A CN202210843124A CN115011382A CN 115011382 A CN115011382 A CN 115011382A CN 202210843124 A CN202210843124 A CN 202210843124A CN 115011382 A CN115011382 A CN 115011382A
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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
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The invention relates to a blast furnace gas desulfurization and regeneration integrated tower and application thereof, comprising a tower body, wherein the tower body is sequentially provided with a regeneration section, a transition section, a liquid-rich section, an air inlet section, a first filler section, a first distribution section, a second filler section, a second distribution section, a foam removing section and an air outlet section from top to bottom; a desulfurizing liquid inlet is arranged between the defoaming section and the second distribution section; a one-way overflow port is arranged between the transition section and the rich liquid section; the channel between the transition section and the regeneration section is an overflow channel, and the overflow channel is higher than the bottom of the transition section; the regeneration section is provided with a sulfur foam outlet and a regeneration desulfurization liquid outlet, and the regeneration desulfurization liquid outlet is connected with the desulfurization liquid inlet through a pump; the bottom of the regeneration section is provided with a regenerated gas distribution plate. According to the integrated tower for desulfurization and regeneration of blast furnace gas, the desulfurization and regeneration are integrated into a whole, the process is simple, the occupied area is greatly reduced, and the regeneration efficiency is obviously improved.
Description
Technical Field
The invention relates to the technical field of blast furnace gas desulfurization/purification, in particular to a blast furnace gas desulfurization and regeneration integrated tower and application thereof.
Background
At present, a large amount of coal gas is generated in the blast furnace ironmaking process, and the main components of the coal gas comprise CO and CO 2 、N 2 、H 2 The sulfur compounds are mainly divided into organic sulfur and inorganic sulfur, and the organic sulfur components are carbonyl sulfur (COS) and carbon disulfide (CS) 2 ) Thioether thiols, etc., mainly carbonyl sulfide (COS); the inorganic sulfur has H as main component 2 And S. SO is generated from sulfide in blast furnace gas after combustion 2 SO in flue gas 2 If the emission reaches the standard, a desulfurization setting is required, and the method is divided into two methods: source (blast furnace gas) desulfurization, tail end (flue gas) desulfurization. Because the tail end (flue gas) desulfurization has the problems of multiple users, different sizes of devices, more dispersed management and the like, environmental protection departments in various regions have come out of policy in succession to point out that the source desulfurization is carried out on blast furnace gas.
The mature process route at present has the advantages of utilizing the high temperature and pressure of blast furnace gas before the TRT residual pressure power generation/pressure reduction valve bank, arranging an organic sulfur conversion device, and converting organic sulfur and saturated water in the gas into H through reaction 2 S, then arranging a wet oxidation desulfurization device behind the TRT (blast furnace gas recovery turbine) residual pressure power generation/pressure reduction valve bank to remove H in the blast furnace gas 2 S, simultaneously, the wet desulphurization device can remove the residual organic sulfur again to ensure that the total sulfur at the outlet is less than or equal to 20mg/Nm 3 Ensuring SO in the combustion flue gas of blast furnace gas 2 Discharging after reaching the standard. Organic sulfur hydrolysis is a mature technology in coal chemical industry, the efficiency can reach more than 90 percent, wet oxidation desulfurization is the most widely applied technology in coal chemical industry and coking industry, the desulfurization efficiency can reach more than 99 percent, desulfurization liquid is oxidized, regenerated and recycled, auxiliary materials are less in consumption, and hydrogen sulfide is absorbed by the solution to be converted into a simple substanceAnd sulfur is recycled.
The traditional wet oxidation desulfurization device has the advantages of scattered desulfurization towers and regeneration towers, large floor area, long flow, high energy consumption of high-tower regeneration process and inconvenient operation.
For example, CN112961710A discloses a method for desulfurizing blast furnace gas, wherein the mass concentration of alkali in an alkaline aqueous solution absorbent is 0.1-20%, the reaction temperature is 20-200 ℃, the contact time of gas and alkali liquor is more than 1 second, and the content of carbonyl sulfide and hydrogen sulfide in the absorbed gas is more than 1mg/m 3 . Although the wet desulphurization can remove carbonyl sulfide and hydrogen sulfide simultaneously, the removal of carbonyl sulfide and hydrogen sulfide is competitive, and the actual purification efficiency is not high.
CN206262348U discloses a wet flue gas desulfurization device, and the device includes water pump, main water pipe, spiral pipe and more than two sections of spiral pipes, and coal gas contacts mass transfer with spray liquid from bottom to top, and its simple structure, design system resistance of no filler is also less, but coal gas and spray liquid contact surface is less, and desulfurization efficiency is not high, and also need set up the regenerator column in addition.
Therefore, the currently adopted blast furnace gas desulfurization device is not perfect, and the problems of poor desulfurization effect, complex desulfurizing agent regeneration process, poor regeneration effect and the like still exist.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a blast furnace gas desulfurization and regeneration integrated tower and application thereof, so as to solve the problems that the currently adopted blast furnace gas desulfurization device is not perfect, and has poor desulfurization effect, complex desulfurizer regeneration process, poor regeneration effect and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a blast furnace gas desulfurization and regeneration integrated tower, which comprises a tower body, wherein the tower body is sequentially provided with a regeneration section, a transition section, a liquid-rich section, an air inlet section, a first filling section, a first distribution section, a second filling section, a second distribution section, a defoaming section and an air outlet section from top to bottom;
a desulfurizing liquid inlet is arranged between the defoaming section and the second distribution section;
the gas inlet section is provided with a blast furnace gas inlet;
a one-way overflow port is arranged between the transition section and the rich liquid section;
a channel between the transition section and the regeneration section is an overflow channel, and the overflow channel is higher than the bottom of the transition section;
the opening of the one-way overflow port and the inlet of the overflow channel are arranged in a staggered manner;
the regeneration section is provided with a sulfur foam outlet and a regenerated desulfurization liquid outlet, the height of the sulfur foam outlet is greater than that of the regenerated desulfurization liquid outlet, and the bottom of the tower body is taken as a reference;
the regeneration desulfurization liquid outlet is connected with the desulfurization liquid inlet through a pump;
and a regenerated gas distribution plate is arranged at the bottom of the regeneration section.
According to the integrated tower for desulfurization and regeneration of blast furnace gas, the desulfurization and the regeneration are integrated into a whole, so that the process is simple, and the occupied area is greatly reduced; the stability of a flow field in the tower can be improved by the layered arrangement of the packing sections in the tower; compared with self-suction injection, the design of the blower and the air distribution plate can more accurately regulate the regeneration air quantity, and remarkably improve the regeneration efficiency. The contact area between the gas and the filler in the tower is large, the resistance is small, the tower is suitable for various working conditions, the desulfurization efficiency of the blast furnace gas can be obviously improved, and considerable economic benefits are achieved.
In the present invention, the aspect ratio of the integrated blast furnace gas desulfurization and regeneration column may be 2 to 3, and for example, may be 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, or 3, but is not limited to the above-mentioned values, and other values not listed in the above range are also applicable.
In the present invention, the minimum vertical distance between the first filler section and the first distribution section may be 0.45-0.5m, for example, 0.45m, 0.46m, 0.47m, 0.48m, 0.49m or 0.5m, but is not limited to the values listed, and other values not listed in this range are equally applicable.
In the present invention, the minimum vertical distance between the second packing section and the second distribution section may be 0.5 to 0.6m, and may be, for example, 0.5m, 0.51m, 0.52m, 0.53m, 0.54m, 0.55m, 0.56m, 0.57m, 0.58m, 0.59m, 0.6m, etc., but is not limited to the values recited, and other values not recited in the range are also applicable.
In the present invention, the minimum vertical distance between the first packing section and the second packing section may be 0.9 to 1m, and may be, for example, 0.9m, 0.91m, 0.92m, 0.93m, 0.94m, 0.95m, 0.96m, 0.97m, 0.98m, 0.99m or 1m, etc., but is not limited to the enumerated values, and other values not enumerated within this range are also applicable.
In the invention, the first distribution section and the second distribution section are provided with distributors, and the distributors can be shower heads, impact type, pagoda type, porous calandria type, porous coil type, overflow disc type and overflow groove type.
According to the invention, the overflow channels are arranged in the rich liquid section and the transition section, so that the flow speed is reduced, and the downward movement of coal gas in the rich liquid section can be avoided.
In the invention, the opening of the one-way overflow port and the inlet of the overflow channel are arranged in a staggered manner, so that a new overflow can be formed after the overflow of the rich liquid section enters the transition section, and the situation that the rich liquid section directly enters the overflow channel is avoided, so that a liquid layer cannot be formed in the transition section. If the one-way overflow port can be set as an annular overflow port, then the overflow channel is arranged below the inner circular surface of the annular overflow port, and the maximum opening of the overflow channel is smaller than the diameter of the inner circular surface of the annular overflow port; or the unidirectional overflow port is arranged as a hole type overflow port, at the moment, the unidirectional overflow port can be arranged at one end, and the overflow channel is arranged at the other end which is symmetrical by taking the central line of the tower as the center, thus realizing dislocation.
In a preferred embodiment of the present invention, the regeneration gas distribution plate is provided with gas holes.
Preferably, the pores are uniformly distributed.
Preferably, the diameter of the pores is 2 to 10mm, and for example, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 6.2mm, 6.4mm, 6.6mm, 6.8mm, 7mm, 7.2mm, 7.4mm, 7.6mm, 7.8mm, 8mm, 8.2mm, 8.4mm, 8.6mm, 8.8mm, 9mm, 9.2mm, 9.4mm, 9.6mm, 9.8mm, or 10mm may be mentioned, but not limited to the other values mentioned in this range, and the same applies.
Preferably, the regeneration gas distribution plate is provided with a blowing device.
In the invention, the regenerated gas distribution plate can be composed of a plurality of concentric gas distribution pipes, gas holes are uniformly arranged on the concentric gas distribution pipes, and the gas holes can face to the bottom or the top of the tower.
In a preferred embodiment of the present invention, the vertical height of the overflow channel from the regeneration gas distribution plate is 20 to 50cm, for example, 20cm, 21cm, 22cm, 23cm, 24cm, 25cm, 26cm, 27cm, 28cm, 29cm, 30cm, 31cm, 32cm, 33cm, 34cm, 35cm, 36cm, 37cm, 38cm, 39cm, 40cm, 41cm, 42cm, 43cm, 44cm, 45cm, 46cm, 47cm, 48cm, 49cm or 50cm, but not limited to the above-mentioned values, and other values not listed in this range are also applicable.
Preferably, the transition section is further provided with a regeneration gas outlet.
As a preferable technical scheme of the invention, the first filling section and the second filling section are respectively provided with a filling inlet and a filling outlet.
Preferably, the first distribution section and the second distribution section are respectively provided with an inspection opening.
Preferably, the defoaming section is of a wire mesh structure.
Preferably, the mesh structure has a pore size of 50-80 μm, for example, 50 μm, 51 μm, 52 μm, 53 μm, 54 μm, 55 μm, 56 μm, 57 μm, 58 μm, 59 μm, 60 μm, 61 μm, 62 μm, 63 μm, 64 μm, 65 μm, 66 μm, 67 μm, 68 μm, 69 μm, 70 μm, 71 μm, 72 μm, 73 μm, 74 μm, 75 μm, 76 μm, 77 μm, 78 μm, 79 μm, or 80 μm, but not limited to the recited values, and other values not recited in this range are equally applicable.
In the invention, the size of the pores of the silk screen structure can be the diameter of a circular hole or the equivalent diameter of a non-circular hole, the non-circular hole can be a polygonal hole, and the side length of the polygon is in accordance with the limitation of the size of the pores in the invention.
In the invention, the first distribution section and the second distribution section realize uniform distribution of materials by arranging the distributors.
In the invention, the first filler section and the second filler section are provided with fillers to enhance the contact surface of the desulfurization solution and the blast furnace gas, and the height of the fillers can be selected according to the desulfurization requirement. If the height of the filler in the first filler stage can be from 2 to 20m and the height of the filler in the second filler stage can be from 2 to 20m, for example 2m, 3m, 4m, 5m, 6m, 7m, 8m, 9m, 10m, 11m, 12m, 13m, 14m, 15m, 16m, 17m, 18m, 19m or 20m, etc., it is not limited to the values listed, but other values not listed in this range are equally applicable.
In the invention, the filler section can be supported by adopting the ventilating grating, thereby realizing the fixation of the filler.
In the invention, the blast furnace gas desulfurization and regeneration integrated tower can be specifically arranged after a blast furnace gas hydrolysis tower and TRT residual pressure power generation, and the general flow is hydrolysis tower → TRT residual pressure power generation device → desulfurization and regeneration integrated tower → gas tank/pipe network.
In a second aspect, the invention provides a use of the integrated tower for desulfurization and regeneration of blast furnace gas according to the first aspect, wherein the use includes performing desulfurization treatment on blast furnace gas by using the integrated tower for desulfurization and regeneration of the desulfurized rich solution to obtain a regenerated desulfurization solution, and returning the regenerated desulfurization solution to the desulfurization treatment.
As a preferred technical solution of the present invention, the use includes: after being fed through the gas inlet section, the blast furnace gas is in first contact with the distributed desulfurization solution in a countercurrent mode and passes through the first packing layer, then is in second contact with the distributed desulfurization solution and passes through the second packing layer, and then is defoamed, so that the desulfurized gas is discharged through the gas outlet section;
and the sulfur-rich liquid generated in the desulfurization enters the transition section through the one-way overflow port, then is regenerated in the regeneration section through the overflow channel, and the regenerated desulfurization liquid obtained by regeneration returns to the desulfurization treatment.
As a preferable technical scheme of the invention, the desulfurization solution used in the desulfurization treatment comprises a cobalt phthalocyanine desulfurizer and alkali.
In the present invention, the solvent of the desulfurization solution may be water or other solvents commonly used in the art.
In the present invention, the cobalt phthalocyanine-based desulfurizing agent may be 1 or a combination of at least 2 of cobalt phthalocyanine tetrasulfonate, binuclear cobalt phthalocyanine sulfonate, or ammonium cobalt phthalocyanine sulfonate.
Preferably, the mass concentration of the cobalt phthalocyanine desulfurizing agent in the desulfurizing liquid is 20-100mg/L, and may be, for example, 20mg/L, 22mg/L, 24mg/L, 26mg/L, 28mg/L, 30mg/L, 32mg/L, 34mg/L, 36mg/L, 38mg/L, 40mg/L, 42mg/L, 44mg/L, 46mg/L, 48mg/L, 50mg/L, 52mg/L, 54mg/L, 56mg/L, 58mg/L, 60mg/L, 62mg/L, 64mg/L, 66mg/L, 68mg/L, 70mg/L, 72mg/L, 74mg/L, 76mg/L, 78mg/L, 80mg/L, 82mg/L, or, 84mg/L, 86mg/L, 88mg/L, 90mg/L, 92mg/L, 94mg/L, 96mg/L, 98mg/L, or 100mg/L, etc., but is not limited to the recited values, and other values not recited within the range are also applicable.
Preferably, the mass concentration of the alkali in the desulfurization solution is 10-30g/L, for example, 10g/L, 10.5g/L, 11g/L, 11.5g/L, 12g/L, 12.5g/L, 13g/L, 13.5g/L, 14g/L, 14.5g/L, 15g/L, 15.5g/L, 16g/L, 16.5g/L, 17g/L, 17.5g/L, 18g/L, 18.5g/L, 19g/L, 19.5g/L, 20g/L, 20.5g/L, 21g/L, 21.5g/L, 22g/L, 22.5g/L, 23g/L, 23.5g/L, 24g/L, 24.5g/L, 25g/L, 25.5g/L, 26g/L, 26.5g/L, 27g/L, 27.5g/L, 28g/L, 28.5g/L, 29g/L, 29.5g/L, or 30g/L, etc., but are not limited to the recited values, and other values not recited within the range are equally applicable.
Preferably, the base comprises a soluble carbonate and/or a soluble base.
In the present invention, the soluble carbonate may be sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate, or the like.
In the present invention, the soluble alkali may be sodium hydroxide, potassium hydroxide, lithium hydroxide, or the like.
Preferably, when the alkali used in the desulfurization solution contains a soluble carbonate, the molar ratio of carbonate to bicarbonate in the desulfurization treatment is 1:15 or less, and may be, for example, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:21, 1:22, 1:23, 1:24, 1:25, 1:26, 1:27, 1:28, 1:29, 1:30, 1:31, 1:32, 1:33, 1:34, 1:35, 1:36, 1:37, 1:38, 1:39, 1:40, 1:41, 1:42, 1:43, 1:44, 1:45, 1:46, 1:47, 1:48, 1:49, or 1:50, but is not limited thereto, and other values not listed in this range may be similarly applied.
Preferably, the liquid-gas ratio L/m of the desulfurization solution and the blast furnace gas in the desulfurization treatment 3 For example, the above-mentioned numerical values include, but are not limited to, 10:1, 10.2:1, 10.4:1, 10.6:1, 10.8:1, 11:1, 11.2:1, 11.4:1, 11.6:1, 11.8:1, 12:1, 12.2:1, 12.4:1, 12.6:1, 12.8:1, 13:1, 13.2:1, 13.4:1, 13.6:1, 13.8:1, 14:1, 14.2:1, 14.4:1, 14.6:1, 14.8:1, 15:1, 15.2:1, 15.4:1, 15.8:1, 16:1, 16.2:1, 16.4:1, 16.6:1, 16.8:1, 17:1, 17.2:1, 17.6:1, 17.8:1, 1.8:1, 19.2:1, 18:1, 18.6:1, 19.8:1, 19.4:1, 19.8:1, and the like.
In the invention, if the desulfurization solution and the blast furnace gas are dynamically introduced, the specific gas-liquid ratio of the desulfurization solution and the blast furnace gas in the desulfurization process is controlled by controlling the flow rates of the desulfurization solution and the blast furnace gas.
Preferably, the temperature of the desulfurization treatment is 33 to 37 ℃, for example, 33 ℃, 33.1 ℃, 33.2 ℃, 33.3 ℃, 33.4 ℃, 33.5 ℃, 33.6 ℃, 33.7 ℃, 33.8 ℃, 33.9 ℃, 34 ℃, 34.1 ℃, 34.2 ℃, 34.3 ℃, 34.4 ℃, 34.5 ℃, 34.6 ℃, 34.7 ℃, 34.8 ℃, 34.9 ℃, 35 ℃, 35.1 ℃, 35.2 ℃, 35.3 ℃, 35.4 ℃, 35.5 ℃, 35.6 ℃, 35.7 ℃, 35.8 ℃, 35.9 ℃, 36.1 ℃, 36.2 ℃, 36.3 ℃, 36.4 ℃, 36.5 ℃, 36.6 ℃, 36.7 ℃, 36.8 ℃, 36.9 ℃ or 37 ℃, and the like, but not limited thereto, and the other values not recited in the range are also applicable.
As a preferable technical scheme of the invention, the packing used in the first packing layer and the second packing layer comprises random packing or structured packing.
Preferably, the random packing comprises 1 or a combination of at least 2 of Raschig rings, pall rings or ladder rings.
Preferably, the structured packing comprises corrugated structured packing and/or honeycomb structured packing.
As a preferred technical solution of the present invention, the regeneration is to regenerate the sulfur-rich liquid by using a regeneration gas.
Preferably, the regeneration gas comprises oxygen and/or air.
Preferably, the regeneration gas may also be a mixed gas containing a certain amount of oxygen, such as oxygen and nitrogen in a volume ratio of 1:1, oxygen and nitrogen in a volume ratio of 9:1, oxygen and carbon dioxide in a volume ratio of 1:1, and the like.
Preferably, the feeding amount of the regeneration gas is 60-80m 3 /m 2 H, for example, may be 60m 3 /m 2 ·h、60.5m 3 /m 2 ·h、61m 3 /m 2 ·h、61.5m 3 /m 2 ·h、62m 3 /m 2 ·h、62.5m 3 /m 2 ·h、63m 3 /m 2 ·h、63.5m 3 /m 2 ·h、64m 3 /m 2 ·h、64.5m 3 /m 2 ·h、65m 3 /m 2 ·h、65.5m 3 /m 2 ·h、66m 3 /m 2 ·h、66.5m 3 /m 2 ·h、67m 3 /m 2 ·h、67.5m 3 /m 2 ·h、68m 3 /m 2 ·h、68.5m 3 /m 2 ·h、69m 3 /m 2 ·h、69.5m 3 /m 2 ·h、70m 3 /m 2 ·h、70.5m 3 /m 2 ·h、71m 3 /m 2 ·h、71.5m 3 /m 2 ·h、72m 3 /m 2 ·h、72.5m 3 /m 2 ·h、73m 3 /m 2 ·h、73.5m 3 /m 2 ·h、74m 3 /m 2 ·h、74.5m 3 /m 2 ·h、75m 3 /m 2 ·h、75.5m 3 /m 2 ·h、76m 3 /m 2 ·h、76.5m 3 /m 2 ·h、77m 3 /m 2 ·h、77.5m 3 /m 2 ·h、78m 3 /m 2 ·h、78.5m 3 /m 2 ·h、79m 3 /m 2 ·h、79.5m 3 /m 2 H or 80m 3 /m 2 H, etc., but are not limited to the recited values, and other values not recited within the range are equally applicable.
In the present invention, the unit m of the regeneration gas feed amount 3 /m 2 H means that 60-80 square air per hour is blown per square meter of the regeneration tank liquid surface.
Preferably, the regeneration temperature is 35-40 ℃, for example, can be 35 ℃, 35.2 ℃, 35.4 ℃, 35.6 ℃, 35.8 ℃, 36 ℃, 36.2 ℃, 36.4 ℃, 36.6 ℃, 36.8 ℃, 37 ℃, 37.2 ℃, 37.4 ℃, 37.6 ℃, 37.8 ℃, 38 ℃, 38.2 ℃, 38.4 ℃, 38.6 ℃, 38.8 ℃, 39.2 ℃, 39.4 ℃, 39.6 ℃, 39.8 ℃ or 40 ℃, but not limited to the enumerated values, in the scope of other not listed values are also applicable.
As a preferred technical solution of the present invention, the use includes: after being fed through the gas inlet section, the blast furnace gas is in first contact with the distributed desulfurization solution in a countercurrent mode and passes through the first packing layer, then is in second contact with the distributed desulfurization solution and passes through the second packing layer, and then is defoamed, so that the desulfurized gas is discharged through the gas outlet section;
enabling the sulfur-rich liquid generated in desulfurization to enter a transition section through a one-way overflow port, then regenerating the transition section through a regeneration section through an overflow channel, and returning the regenerated desulfurization liquid obtained through regeneration to desulfurization treatment;
the desulfurization solution used in the desulfurization treatment comprises a cobalt phthalocyanine desulfurizer and alkali; the mass concentration of the cobalt phthalocyanine desulfurizer in the desulfurization solution is 20-100 mg/L; the mass concentration of alkali in the desulfurization solution is 10-30 g/L; the base comprises a soluble carbonate and/or a soluble base; when the alkali used in the desulfurization solution contains soluble carbonate, the molar ratio of carbonate to bicarbonate in desulfurization treatment is less than or equal to 1: 15; the liquid-gas ratio L/m of the desulfurization liquid to the blast furnace gas in the desulfurization treatment 3 1 is represented by (10-20); the temperature of the desulfurization treatment is 33-37 ℃;
the fillers used in the first filler layer and the second filler layer comprise random fillers or regular fillers; preferably, the random packing comprises 1 or a combination of at least 2 of Raschig rings, pall rings or ladder rings; the structured packing comprises corrugated structured packing and/or honeycomb structured packing;
the regeneration is to regenerate the sulfur-rich liquid by using regenerated gas; the regeneration gas comprises oxygen and/or air; the feeding amount of the regeneration gas is 60-80m 3 /m 2 H; the temperature of the regeneration is 35-40 ℃.
Compared with the prior art, the invention has the following beneficial effects:
the integrated tower for desulfurization and regeneration of blast furnace gas provided by the invention has the advantages that the desulfurization and the regeneration of the desulfurization solution are integrated, the flow is obviously simplified, and meanwhile, the stability of a flow field in the tower can be improved through the layered arrangement of the filling sections in the tower; compared with self-suction injection, the design of the blower and the gas distribution plate can more accurately regulate the regeneration air quantity, obviously improve the regeneration efficiency, and ensure that COS and H in the blast furnace gas after desulfurization are not detected in the process 2 S＜2mg/Nm 3 。
Drawings
Fig. 1 is a schematic diagram of a blast furnace gas desulfurization regeneration integrated tower.
In the figure: 1-regeneration section, 1.1-regenerated gas distribution plate, 1.2-blast equipment, 1.3-regenerated desulfurization liquid outlet, 1.4-sulfur foam outlet, 2-transition section, 2.1-overflow channel, 2.2-regenerated gas outlet, 3-liquid-rich section, 3.1-one-way overflow port, 3.2-blast furnace gas inlet, 4-first filling section, 5-first distribution section, 6-second filling section, 7-second distribution section, 8-desulfurization liquid inlet, 9-defoaming section, 10-gas outlet section, 11.1-filling inlet, 11.2-filling outlet, 11.3-inspection port and 12-pump.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
Detailed Description
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
example 1
The embodiment provides a blast furnace gas desulfurization and regeneration integrated tower, as shown in fig. 1, which comprises a tower body, wherein the tower body is sequentially provided with a regeneration section 1, a transition section 2, a rich liquid section 3, an air inlet section, a first filler section 4, a first distribution section 5, a second filler section 6, a second distribution section 7, a foam removing section 9 and an air outlet section 10 from top to bottom;
a desulfurizing liquid inlet 8 is arranged between the foam removing section 9 and the second distribution section 7, the desulfurizing liquid is uniformly distributed by a distributor in the second distribution section 7 after entering, enters the second filler section 6, is contacted with the blast furnace gas through a liquid film on the surface of the filler for mass transfer, then enters the first distribution section 5 again, is uniformly distributed with the blast furnace gas for mass transfer again in the first filler section 4, the generated desulfurizing rich liquid is collected in a rich liquid section 3 and overflows through a one-way overflow port 3.1 to enter a transition section 2, the desulfurizing rich liquid in the transition section 2 reaches a regeneration section 1, a channel between the transition section 2 and the regeneration section 1 is an overflow channel 2.1, and the overflow channel 2.1 is higher than the bottom of the transition section 2; the vertical height between the overflow channel 2.1 and the regenerated gas distribution plate 1.1 is 35 cm; the transition section 2 is also provided with a regenerated gas outlet 2.2 to prevent the regenerated gas from entering the subsequent desulfurization process and influencing the desulfurization.
In this embodiment, the opening of the one-way overflow port 3.1 and the inlet of the overflow channel 2.1 are arranged in a staggered manner, that is, a new overflow can be formed after the overflow of the rich liquid section 3 enters the transition section 2, so as to avoid directly entering the overflow channel 2.1, and thus a liquid layer cannot be formed in the transition section 2. If the one-way overflow opening 3.1 is configured as an annular overflow opening, then the overflow channel 2.1 is configured below the inner circular surface of the annular overflow opening, and the maximum opening of the overflow channel 2.1 should be smaller than the diameter of the inner circular surface of the annular overflow opening.
In this embodiment, the first distribution section 5 and the second distribution section 7 are provided with distributors to realize uniform distribution of the desulfurization solution, and the distributors are porous disc-type distributors.
The regeneration section 1 is provided with a sulfur foam outlet 1.4 and a regenerated desulfurization liquid outlet 1.3, the height of the sulfur foam outlet 1.4 is larger than that of the regenerated desulfurization liquid outlet 1.3, and sulfur foam output from the sulfur foam outlet 1.4 is introduced into a sulfur melting kettle to melt sulfur by taking the bottom of the tower body as a reference to obtain elemental sulfur cakes.
The regenerated desulfurization liquid outlet 1.3 is connected with the desulfurization liquid inlet 8 through a pump 12, so that the regenerated desulfurization liquid can be recycled.
The bottom of regeneration section 1 is provided with regeneration gas distribution board 1.1, regeneration gas distribution board 1.1 is provided with the gas pocket, gas pocket evenly distributed, the diameter of gas pocket is 6mm, regeneration gas distribution board 1.1 disposes air-blast apparatus 1.2.
The first filling section 4 and the second filling section 6 are respectively provided with a filling inlet 11.1 and a filling outlet 11.2; the first distribution section 5 and the second distribution section 7 are respectively provided with an inspection opening 11.3.
The defoaming section 9 is of a wire mesh structure; the size of the pores of the screen mesh structure is 74 μm, and the screen mesh structure is a circular hole, and the material of the screen mesh may be stainless steel or a polymer material, and stainless steel is selected in this embodiment.
In the embodiment, the gas inlet section is provided with a blast furnace gas inlet 3.2 so as to realize reasonable feeding of gas.
Further, the minimum vertical distance between the first filler section and the first distribution section may be 0.45-0.5m, specifically 0.45m in this embodiment;
further, the minimum vertical distance between the second filler section and the second distribution section may be 0.5-0.6m, in particular 0.55m in this embodiment;
further, the minimum vertical distance between the first packing section and the second packing section may be 0.9 to 1m, specifically 1m in this embodiment;
in this embodiment, the regeneration section may also optionally be provided with a baffle to ensure that the solution or sulfur foam flows out in a timely manner.
Application example 1
In this application example, the integrated tower for desulfurization and regeneration of blast furnace gas provided in example 1 is used to desulfurize blast furnace gas and regenerate desulfurization solution, and specifically includes: after being fed through the gas inlet section, the blast furnace gas is in first contact with the distributed desulfurization solution in a countercurrent mode and passes through the first packing layer, then is in second contact with the distributed desulfurization solution and passes through the second packing layer, and then is defoamed, so that the desulfurized gas is discharged through the gas outlet section;
enabling the sulfur-rich liquid generated in desulfurization to enter a transition section through a one-way overflow port, then regenerating the transition section through a regeneration section through an overflow channel, and returning the regenerated desulfurization liquid obtained through regeneration to desulfurization treatment;
the desulfurization solution used in the desulfurization treatment comprises a cobalt phthalocyanine desulfurizer (sodium cobalt phthalocyanine tetrasulfonate) and alkali; the mass concentration of the cobalt phthalocyanine desulfurizer in the desulfurization solution is 70mg/L, and the mass concentration of alkali is 25 g/L; the alkali comprises sodium carbonate, and the molar ratio of carbonate to bicarbonate in the desulfurization treatment is 1: 15; the liquid-gas ratio L/m of the desulfurization liquid and the blast furnace gas in the desulfurization treatment 3 Is 13:1 (the flow ratio is controlled to be 13:1 during dynamic contact); the temperature of the desulfurization treatment is 35 ℃;
the first filler layer adopts pall ring filler, and the height of the filler is 10 m; the second packing layer adopts corrugated regular packing, and the height of the packing is 12 m;
the regeneration is to regenerate the sulfur-rich liquid by using regenerated gas; the regeneration gas is air; the feeding amount of the regeneration gas is 70m 3 /m 2 H; the temperature of the regeneration was 37 ℃.
The performance index of the desulfurization process is detailed in table 1.
Application example 2
In this application example, the blast furnace gas desulfurization and regeneration integrated tower provided in example 1 is used to perform desulfurization of blast furnace gas and regeneration of desulfurization solution, and specifically includes: after being fed through the gas inlet section, the blast furnace gas is in first contact with the distributed desulfurization solution in a countercurrent mode and passes through the first packing layer, then is in second contact with the distributed desulfurization solution and passes through the second packing layer, and then is defoamed, so that the desulfurized gas is discharged through the gas outlet section;
enabling the sulfur-rich liquid generated in desulfurization to enter a transition section through a one-way overflow port, then regenerating the transition section through a regeneration section through an overflow channel, and returning the regenerated desulfurization liquid obtained through regeneration to desulfurization treatment;
the desulfurization solution used in the desulfurization treatment comprises a cobalt phthalocyanine desulfurizer (ammonium cobalt phthalocyanine sulfonate) and alkali; the mass concentration of the cobalt phthalocyanine desulfurizer in the desulfurization solution is 20 mg/L; the mass concentration of alkali in the desulfurization solution is 10 g/L; the alkali is sodium hydroxide; the liquid-gas ratio L/m of the desulfurization liquid and the blast furnace gas in the desulfurization treatment 3 Is 10:1 (the flow ratio is controlled to be 10:1 during dynamic contact); the temperature of the desulfurization treatment is 37 ℃;
the first packing layer adopts corrugated structured packing, and the height of the packing is 13 m; the second packing layer adopts honeycomb structured packing, and the height of the packing is 13 m;
the regeneration is to regenerate the sulfur-rich liquid by using regenerated gas; the regeneration gas is oxygen; the feeding amount of the regeneration gas is 60m 3 /m 2 H; the temperature of the regeneration was 40 ℃.
The performance index of the desulfurization process is detailed in table 1.
Application example 3
In this application example, the blast furnace gas desulfurization and regeneration integrated tower provided in example 1 is used to perform desulfurization of blast furnace gas and regeneration of desulfurization solution, and specifically includes: after being fed through the gas inlet section, the blast furnace gas is in first contact with the distributed desulfurization solution in a countercurrent mode and passes through the first packing layer, then is in second contact with the distributed desulfurization solution and passes through the second packing layer, and then is defoamed, so that the desulfurized gas is discharged through the gas outlet section;
enabling the sulfur-rich liquid generated in desulfurization to enter a transition section through a one-way overflow port, then regenerating the transition section through a regeneration section through an overflow channel, and returning the regenerated desulfurization liquid obtained through regeneration to desulfurization treatment;
the desulfurization solution used in the desulfurization treatment comprises a cobalt phthalocyanine desulfurizer (binuclear cobalt phthalocyanine sodium sulfonate) and alkali; the mass concentration of the cobalt phthalocyanine desulfurizer in the desulfurization solution is 50 mg/L; the mass concentration of alkali in the desulfurization solution is 17 g/L; the alkali is sodium carbonate and sodium hydroxide with the mass ratio of 1:1, and the molar ratio of carbonate to bicarbonate in desulfurization treatment is 1: 18; of the desulfurization liquid and blast furnace gas in the desulfurization treatmentLiquid-gas ratio L/m 3 17:1 (the flow ratio is controlled to be 17:1 during dynamic contact); the temperature of the desulfurization treatment is 33 ℃;
the first packing layer adopts honeycomb structured packing, and the height of the packing is 8 m; the second packing layer adopts Raschig ring packing, and the height of the packing is 10 m;
the regeneration is to regenerate the sulfur-rich liquid by using regenerated gas; the regeneration gas is air; the feeding amount of the regeneration gas is 80m 3 /m 2 H; the temperature of the regeneration was 35 ℃.
The performance index of the desulfurization process is detailed in table 1.
Application example 4
In this application example, the blast furnace gas desulfurization and regeneration integrated tower provided in example 1 is used to perform desulfurization of blast furnace gas and regeneration of desulfurization solution, and specifically includes: after being fed through the gas inlet section, the blast furnace gas is in first contact with the distributed desulfurization solution in a countercurrent mode and passes through the first packing layer, then is in second contact with the distributed desulfurization solution and passes through the second packing layer, and then is defoamed, so that the desulfurized gas is discharged through the gas outlet section;
enabling the sulfur-rich liquid generated in desulfurization to enter a transition section through a one-way overflow port, then regenerating the transition section through a regeneration section through an overflow channel, and returning the regenerated desulfurization liquid obtained through regeneration to desulfurization treatment;
the desulfurization solution used in the desulfurization treatment comprises cobalt phthalocyanine desulfurizer (binuclear cobalt phthalocyanine sodium sulfonate and cobalt phthalocyanine ammonium sulfonate with the mass ratio of 1: 1) and alkali; the mass concentration of the cobalt phthalocyanine desulfurizer in the desulfurization solution is 100 mg/L; the mass concentration of alkali in the desulfurization solution is 30 g/L; the alkali is sodium carbonate, and the molar ratio of carbonate to bicarbonate in desulfurization treatment is 1: 20; the liquid-gas ratio L/m of the desulfurization liquid and the blast furnace gas in the desulfurization treatment 3 Is 20:1 (the flow ratio is controlled to be 20:1 during dynamic contact); the temperature of the desulfurization treatment is 34 ℃;
the first packing layer adopts a step ring packing, and the height of the packing is 7 m; the second packing layer adopts Raschig ring packing, and the height of the packing is 7 m;
the regeneration is to adopt the regeneration gas to carry out the sulfur-rich liquidRegeneration; the regeneration gas is oxygen and air in a volume ratio of 1: 1; the feeding amount of the regeneration gas is 66m 3 /m 2 H; the temperature of the regeneration was 39 ℃.
The performance index of the desulfurization process is detailed in table 1.
The specific composition of the blast furnace gas in the application example is 20 percent CO and 18 percent CO 2 、2％H 2 、0.3％CH 4 、0.07％O 2 、45％N 2 、＜5mg/Nm 3 Of dust of (COS) 160mg/Nm 3 And H 2 S100mg/Nm 3 The flow rate of blast furnace gas supplied is 15 ten thousands Nm 3 And/h is dynamic feeding, and the height-diameter ratio of the blast furnace gas desulfurization and regeneration integrated tower is 2.6.
TABLE 1
In the above table, the content of hydrogen sulfide is in the range because the detection is performed on-line, so the fixed value is not directly defined, but the content is summarized as the range with the upper limit according to the actual on-line monitoring result, that is, the H in the desulfurized coal gas is detected at the specific time point 2 The S content is less than 2mg/Nm 3 。
According to the results of the application examples, the integrated tower for the desulfurization and regeneration of the blast furnace gas provided by the invention has the advantages that the desulfurization and the regeneration of the desulfurization solution are integrated, the flow is obviously simplified, and meanwhile, the stability of a flow field in the tower can be improved through the layered arrangement of the filling sections in the tower; compared with self-suction injection, the design of the blower and the air distribution plate can more accurately regulate the regeneration air quantity, and remarkably improve the regeneration efficiency.
It is to be noted that the present invention is described by the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the detailed structural features, that is, it is not meant to imply that the present invention must be implemented by relying on the detailed structural features. It should be understood by those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, additions of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. The blast furnace gas desulfurization and regeneration integrated tower is characterized by comprising a tower body, wherein the tower body is sequentially provided with a regeneration section, a transition section, a liquid-rich section, an air inlet section, a first filling section, a first distribution section, a second filling section, a second distribution section, a defoaming section and an air outlet section from top to bottom;
a desulfurizing liquid inlet is arranged between the defoaming section and the second distribution section;
the gas inlet section is provided with a blast furnace gas inlet;
a one-way overflow port is arranged between the transition section and the rich liquid section;
a channel between the transition section and the regeneration section is an overflow channel, and the overflow channel is higher than the bottom of the transition section;
the opening of the one-way overflow port and the inlet of the overflow channel are arranged in a staggered manner;
the regeneration section is provided with a sulfur foam outlet and a regenerated desulfurization liquid outlet, the height of the sulfur foam outlet is larger than that of the regenerated desulfurization liquid outlet, and the bottom of the tower body is taken as a reference;
the regeneration desulfurization liquid outlet is connected with the desulfurization liquid inlet through a pump;
and a regenerated gas distribution plate is arranged at the bottom of the regeneration section.
2. The integrated blast furnace gas desulfurization and regeneration tower of claim 1, wherein the regenerated gas distribution plate is provided with gas holes;
preferably, the pores are uniformly distributed;
preferably, the diameter of the air holes is 2-10 mm;
preferably, the regeneration gas distribution plate is provided with a blowing device.
3. The blast furnace gas desulfurization and regeneration integrated tower of claim 1 or 2, wherein the vertical height of the overflow channel from the regenerated gas distribution plate is 20-50 cm;
preferably, the transition section is further provided with a regeneration gas outlet.
4. The blast furnace gas desulfurization and regeneration integrated tower according to any one of claims 1 to 3, wherein the first packing section and the second packing section are each provided with a packing inlet and a packing outlet, respectively;
preferably, the first distribution section and the second distribution section are respectively provided with an inspection opening;
preferably, the defoaming section is of a wire mesh structure;
preferably, the mesh structure has a pore size of 50-80 μm.
5. The use of the blast furnace gas desulfurization and regeneration integrated tower according to any one of claims 1 to 4, which comprises performing desulfurization treatment on blast furnace gas by using the blast furnace gas desulfurization and regeneration integrated tower, and regenerating the desulfurized rich sulfur solution to obtain a regenerated desulfurization solution and returning the regenerated desulfurization solution to the desulfurization treatment.
6. The use according to claim 5, wherein the use comprises: after being fed through the gas inlet section, the blast furnace gas is in first contact with the distributed desulfurization solution in a countercurrent mode and passes through the first packing layer, then is in second contact with the distributed desulfurization solution and passes through the second packing layer, and then is defoamed, so that the desulfurized gas is discharged through the gas outlet section;
and the sulfur-rich liquid generated in the desulfurization enters the transition section through the one-way overflow port, then the regeneration section is regenerated through the overflow channel, and the regenerated desulfurization liquid obtained by regeneration returns to the desulfurization treatment.
7. The use according to claim 5 or 6, wherein the desulfurization solution used in the desulfurization treatment comprises a cobalt phthalocyanine-based desulfurizing agent and a base;
preferably, the mass concentration of the cobalt phthalocyanine desulfurizer in the desulfurization solution is 20-100 mg/L;
preferably, the mass concentration of the alkali in the desulfurization solution is 10-30 g/L;
preferably, the base comprises a soluble carbonate and/or a soluble base;
preferably, when the alkali used in the desulfurization solution contains soluble carbonate, the molar ratio of carbonate to bicarbonate in desulfurization treatment is less than or equal to 1: 15;
preferably, the liquid-gas ratio L/m of the desulfurization solution and the blast furnace gas in the desulfurization treatment 3 1 is represented by (10-20);
preferably, the temperature of the desulfurization treatment is 33 to 37 ℃.
8. Use according to any one of claims 5 to 7, wherein the packing used in the first and second layers of packing comprises random packing or structured packing;
preferably, the random packing comprises 1 or a combination of at least 2 of Raschig rings, pall rings or ladder rings;
preferably, the structured packing comprises corrugated structured packing and/or honeycomb structured packing.
9. Use according to any one of claims 5 to 8, wherein the regeneration is a regeneration of the sulphur-rich liquor with a regeneration gas;
preferably, the regeneration gas comprises oxygen and/or air;
preferably, the feeding amount of the regeneration gas is 60-80m 3 /m 2 ·h；
Preferably, the temperature of the regeneration is 35-40 ℃.
10. The use according to any one of claims 5 to 9, wherein the use comprises: after being fed through the gas inlet section, the blast furnace gas is in first contact with the distributed desulfurization solution in a countercurrent mode and passes through the first packing layer, then is in second contact with the distributed desulfurization solution and passes through the second packing layer, and then is defoamed, so that the desulfurized gas is discharged through the gas outlet section;
enabling the sulfur-rich liquid generated in desulfurization to enter a transition section through a one-way overflow port, then regenerating the transition section through a regeneration section through an overflow channel, and returning the regenerated desulfurization liquid obtained through regeneration to desulfurization treatment;
the desulfurization solution used in the desulfurization treatment comprises a cobalt phthalocyanine desulfurizer and alkali; the mass concentration of the cobalt phthalocyanine desulfurizer in the desulfurization solution is 20-100 mg/L; the mass concentration of alkali in the desulfurization solution is 10-30 g/L; the base comprises a soluble carbonate and/or a soluble base; when the alkali used in the desulfurization solution contains soluble carbonate, the molar ratio of carbonate to bicarbonate in desulfurization treatment is less than or equal to 1: 15; the liquid-gas ratio L/m of the desulfurization liquid to the blast furnace gas in the desulfurization treatment 3 1 is represented by (10-20); the temperature of the desulfurization treatment is 33-37 ℃;
the fillers used in the first filler layer and the second filler layer comprise random fillers or regular fillers; preferably, the random packing comprises 1 or a combination of at least 2 of Raschig rings, pall rings or ladder rings; the structured packing comprises corrugated structured packing and/or honeycomb structured packing;
the regeneration is to regenerate the sulfur-rich liquid by using regenerated gas; the regeneration gas comprises oxygen and/or air; the feeding amount of the regeneration gas is 60-80m 3 /m 2 H; the temperature of the regeneration is 35-40 ℃.
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