A large volume, normal pressure, low resistance blast furnace gas desulfurization system

Abstract

The invention discloses a kind of atmospheric volume, normal pressure, low resistance blast furnace gas desulfurization system, including dechlorination and deoxygenation device, hydrolysis device and adsorption device, all of which are 3-layer structures, and are sequentially provided with upper air pressure buffer zone, packing layer and lower air pressure buffer zone from top to bottom, and deoxidizer, hydrolyzer and adsorbent are respectively filled in the packing layer, and the volume ratio in the upper air pressure buffer zone, packing layer and lower air pressure buffer zone is 1:(0.8-2):1, and the blast furnace gas inlet, hydrolysis inlet and adsorption inlet are respectively arranged on the side wall of the air pressure buffer zone above the device, and the deoxidation and dechlorination outlet, hydrolysis outlet and adsorption outlet are respectively arranged on the other side wall of the air pressure buffer zone below the device. The system of the present invention reduces the thickness of the packing layer, and the pre-treatment gas adopts the upper inlet and lower outlet mode, which can effectively reduce the resistance drop of the packing layer, and reduces the pressure requirement of the desulfurization system for blast furnace gas.

Description

Technical Field

[0001] The invention relates to the technical field of atmosphere purification and environmental protection, and in particular to an atmospheric volume, normal pressure and low resistance blast furnace gas desulfurization system. Background Art

[0002] Blast furnace gas has considerable combustion value, in which the volume content of carbon monoxide is about 28%, the volume content of hydrogen is about 1%, and the volume content of methane is about 0.5%. Blast furnace gas is usually sent to hot blast stoves, heating furnaces, coke ovens, boilers, and gas units for combustion and use in the form of fuel. However, in addition to the above gases, blast furnace gas also contains sulfides such as COS (carbonyl sulfide), CS2, and H2S. Among these sulfides, the main component is COS, and the total sulfur concentration generally reaches more than 200 mgS / Nm3. If these sulfides are not restricted, they will be discharged into the air in the form of SO2, which will cause a large amount of acid rain to form. With the increase of people's environmental awareness, the emission limit of sulfur is becoming increasingly strict. Each terminal using blast furnace gas has established a huge flue gas desulfurization device. Such a scattered desulfurization device not only greatly wastes the limited space of the steel plant, but also the cost of flue gas desulfurization and secondary pollution are becoming increasingly prominent. Therefore, compared with terminal desulfurization technology, source desulfurization of blast furnace gas becomes an ideal method for treating sulfur species.

[0003] Prior art CN110218590A discloses a blast furnace gas desulfurization method and system, wherein the blast furnace gas desulfurization method comprises the following steps: 1) passing the compressed raw gas into a hydrolysis tower for COS hydrolysis to generate a mixed gas containing hydrogen sulfide; 2) passing the mixed gas containing hydrogen sulfide into a pressure swing adsorption carbon dioxide purification device for rough desulfurization to obtain a rough desulfurized gas and desorbing the adsorbent adsorbing carbon dioxide and hydrogen sulfide; 3) passing the rough desulfurized gas into a fine desulfurization tower for fine desulfurization to obtain a fine desulfurized gas; 4) passing the fine desulfurized gas into a pressure swing adsorption carbon monoxide purification section to purify carbon monoxide to obtain desulfurized blast furnace gas. However, the gas volume of blast furnace gas is huge. A 1000 cubic meter blast furnace can produce more than 100,000 standard cubic meters of blast furnace gas per hour, and its pressure is generally greater than 100KPa. After the pressure energy is recovered by the residual pressure turbine power generation device (TRT), the pressure drops to between 5-20KPa. However, changing the pressure of such a huge amount of gas will consume a lot of energy. If normal pressure adsorption is performed, the desulfurization system using traditional adsorbent filling method will have a resistance drop problem, which will lead to the adsorbent dosage not being too high. If the adsorbent dosage is too low, it will cause problems such as frequent adsorption replacement. Summary of the invention

[0004] The present invention aims to solve the problems of large pressure requirement and high treatment cost of the existing desulfurization system for the blast furnace gas to be treated, thereby providing a large volume, normal pressure and low resistance blast furnace gas desulfurization system.

[0005] The present invention adopts the following technical solution:

[0006] A large-volume, normal-pressure, low-resistance blast furnace gas desulfurization system comprises a dechlorination and deoxygenation device, a hydrolysis device and an adsorption device, wherein the dechlorination and deoxygenation device is provided with a blast furnace gas inlet and a deoxygenation and dechlorination outlet, the hydrolysis device is provided with a hydrolysis inlet and a hydrolysis outlet, the adsorption device is provided with an adsorption inlet and an adsorption outlet, the deoxygenation and dechlorination outlet is communicated with the hydrolysis inlet, and the hydrolysis outlet is communicated with the adsorption inlet; the dechlorination and deoxygenation device, the hydrolysis device and the adsorption device all have a three-layer structure, and are provided with an upper air pressure buffer zone, a packing layer and a lower air pressure buffer zone in sequence from top to bottom, the blast furnace gas inlet, the hydrolysis inlet and the adsorption inlet are respectively arranged on one side wall of the air pressure buffer zone above the device where they are located, and the deoxygenation and dechlorination outlet, the hydrolysis outlet and the adsorption outlet are respectively arranged on the other side wall of the air pressure buffer zone below the device where they are located.

[0007] The volume ratio of the upper air pressure buffer zone, the packing layer and the lower air pressure buffer zone is 1:(0.8-2):1.

[0008] Preferably, the volume ratio of the upper air pressure buffer zone, the packing layer and the lower air pressure buffer zone is 1:1.5:1.

[0009] The packing layer in the dechlorination and deoxygenation device has a filling height-to-diameter ratio of 1:10 to 1:30.

[0010] The upper end and the lower end of the packing layer are respectively provided with grids, and the packing in the packing layer is fixed between the upper air pressure buffer zone and the lower air pressure buffer zone through the two grids.

[0011] The dechlorination and deoxygenation device is arranged above the hydrolysis device, and the adsorption device is arranged below the hydrolysis device. A heat insulation layer is arranged between the dechlorination and deoxygenation device and the hydrolysis device, and between the hydrolysis device and the adsorption device.

[0012] The packing layer in the dechlorination and deoxygenation device is used to fill the deoxidizer; the packing layer in the hydrolysis device is used to fill the hydrolysis agent; the packing layer in the adsorption device is used to fill the adsorbent.

[0013] The system comprises at least two adsorption devices arranged in parallel, each of the adsorption devices is vertically stacked and arranged below the hydrolysis device, and the heat insulation layer is arranged between two adjacent adsorption devices.

[0014] Preferably, the system comprises up to 4 adsorption devices arranged in parallel, wherein 3 of the adsorption devices arranged in parallel are used for adsorption treatment of blast furnace gas, and the other one is for standby or for regenerating the adsorbent; each of the adsorption devices is vertically stacked and arranged below the hydrolysis device.

[0015] The system also includes a heat exchange device, which is provided with a heat exchange inlet and a heat exchange outlet. The heat exchange inlet is respectively connected to the adsorption inlets of the four adsorption devices. The adsorption outlets of the four adsorption devices are combined and divided into two paths. One path is used for recovering the purified blast furnace gas, and the other path is connected to the heat exchange inlet through an air pump via a regeneration inlet pipeline. Part of the purified blast furnace gas is heated by the heat exchange device and then enters the adsorption device, and is used to regenerate the saturated adsorbent in the adsorption device.

[0016] The technical solution of the present invention has the following advantages:

[0017] A. In the large-volume, normal-pressure, low-resistance blast furnace gas desulfurization system of the present invention, each treatment device includes an air pressure buffer zone above the packing layer, a packing layer, and an air pressure buffer zone below the packing layer, thereby reducing the thickness of the packing layer, and the pre-treated gas is all in a top-in, bottom-out manner, which can effectively reduce the resistance drop of the packing layer and reduce the pressure requirement of the desulfurization system for the blast furnace gas. The minimum treatment pressure of the blast furnace gas in the system is 5KPa, and the resistance drop of each group of treatment devices is less than 500Pa, thereby increasing the effective treatment volume of the blast furnace gas.

[0018] B. In the present invention, the dechlorination and deoxygenation device, the hydrolysis device and the adsorption device are arranged vertically, which greatly reduces the floor space of the system and saves land resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the overall structure of the large volume, normal pressure and low resistance blast furnace gas desulfurization system of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the packing layer in the present invention;

[0022] Figure 3 It is a schematic diagram of the grid structure in the present invention.

[0023] The following are marked in the figure:

[0024] 1-dechlorination and deoxygenation device, 11-blast furnace gas inlet, 12-deoxygenation and dechlorination outlet; 2-hydrolysis device, 21-hydrolysis inlet, 22-hydrolysis outlet; 3-adsorption device, 31-adsorption inlet, 32-adsorption outlet; 4-heat exchange device, 41-heat exchange inlet, 42-heat exchange outlet; 5-air pump; 6-regeneration inlet pipeline; 7-adsorption regeneration outlet pipeline;

[0025] a-upper air pressure buffer zone; b-filling layer; c-lower air pressure buffer zone; d-grid; e-insulation layer; f-filling port. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] like Figure 1As shown, the present invention provides a large-volume, normal-pressure, low-resistance blast furnace gas desulfurization system, comprising a dechlorination and deoxygenation device 1, a hydrolysis device 2 and an adsorption device 3, the dechlorination and deoxygenation device 1 is provided with a blast furnace gas inlet 11 and a deoxygenation and dechlorination outlet 12, the hydrolysis device 2 is provided with a hydrolysis inlet 21 and a hydrolysis outlet 22, the adsorption device 3 is provided with an adsorption inlet 31 and an adsorption outlet 32, the deoxygenation and dechlorination outlet 12 is connected to the hydrolysis inlet 21, and the hydrolysis outlet 22 is connected to the adsorption inlet 31. The dechlorination and deoxygenation device 1, the hydrolysis device 2 and the adsorption device 3 are all three-layer structures, and are provided with an upper air pressure buffer zone a, a packing layer b and a lower air pressure buffer zone c in order from top to bottom. The blast furnace gas inlet 11, the hydrolysis inlet 21 and the adsorption inlet 31 are respectively arranged on one side wall of the upper air pressure buffer zone a of the device in which they are located, and the deoxygenation and dechlorination outlet 12, the hydrolysis outlet 22 and the adsorption outlet 32 ​​are respectively arranged on the other side wall of the lower air pressure buffer zone c of the device in which they are located. The volume ratio of the upper air pressure buffer zone a, the packing layer b and the lower air pressure buffer zone c is 1:(0.8-2):1, and the filling height-to-diameter ratio of the packing layer b shown in the dechlorination and deoxygenation device 1 is 1:10-1:30. Each processing device in the present invention includes an air pressure buffer zone above the packing layer, a packing layer and an air pressure buffer zone below the packing layer, which reduces the thickness of the packing layer, and the pre-treated gas adopts a top-in and bottom-out method, which can effectively reduce the resistance drop of the packing layer, reduce the pressure requirement of the desulfurization system for blast furnace gas, and increase the effective processing capacity of blast furnace gas. The minimum processing pressure of blast furnace gas in this system is 5KPa, and the resistance drop of each group of processing devices is less than 500Pa.

[0030] Furthermore, if Figure 2 , Figure 3 As shown, the upper and lower ends of the packing layer b are provided with grids d respectively, and the packing in the packing layer b is fixed between the upper air pressure buffer a and the lower air pressure buffer c through the two grids d. The grid d adopts an annular spider web structure, and has good gas permeability.

[0031] The control temperature of the dechlorination and deoxidation device 1 is 80-150°C. The dechlorination and deoxidation device 1 is arranged above the hydrolysis device 2. The filling height-diameter ratio of the packing layer b in the dechlorination and deoxidation device 1 is 1:10-1:30. The adsorption device 3 is arranged below the hydrolysis device 2. A heat insulation layer e is provided between the dechlorination and deoxidation device 1 and the hydrolysis device 2, and between the hydrolysis device 2 and the adsorption device 3. The packing layer b in the dechlorination and deoxidation device 1 is used to fill the deoxidizer, and the deoxidizer can be selected from at least one of a noble metal deoxidizer and a non-noble metal cobalt-molybdenum-sulfur type deoxidizer; the noble metal deoxidizer is preferably a supported noble metal deoxidizer, and the active component in the supported noble metal deoxidizer is selected from one or more of gold, platinum, palladium, and ruthenium, and the carrier is an oxide carrier or a ceramic carrier, wherein the oxide carrier is selected from one or more of aluminum oxide, silicon oxide, magnesium oxide, titanium oxide, zirconium oxide, and cerium oxide; the active component in the non-noble metal cobalt-molybdenum-sulfur type deoxidizer is selected from one or more of CoMo2S, CoMo3S, and CoMo4S; and the carrier is aluminum oxide. The packing layer b in the hydrolysis device 2 is used to fill the hydrolysis agent, which is a loaded hydrolysis agent, and the active ingredient of the loaded hydrolysis agent is selected from one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium oxalate, potassium oxalate, sodium sulfate, and potassium sulfate, and the carrier is selected from one or more of carbon nitride, aluminum oxide, silicon oxide, magnesium oxide, titanium oxide, zirconium oxide, and cerium oxide. The packing layer b of the adsorption device 3 is used to fill the adsorbent. The adsorbent is a loaded adsorbent, and the active ingredient of the loaded adsorbent is selected from one or more of iron oxide, cobalt oxide, nickel oxide, and copper oxide, and the carrier is selected from one or more of modified bauxite, carbon nitride, aluminum oxide, silicon oxide, magnesium oxide, titanium oxide, zirconium oxide, and cerium oxide.

[0032] The desulfurization system includes at least two adsorption devices 3 arranged in parallel, preferably four, wherein three of the adsorption devices 3 arranged in parallel are used for adsorption treatment of blast furnace gas, and the other one is standby or for regenerating the adsorbent; each adsorption device 3 is vertically stacked and arranged below the hydrolysis device 2, and an insulation layer e is arranged between two adjacent adsorption devices 3.

[0033] When in use, the blast furnace gas to be treated enters the dechlorination and deoxygenation device 1 through the blast furnace gas inlet 11 for treatment to obtain a raw gas after dechlorination and deoxygenation treatment, and the raw gas after dechlorination and deoxygenation treatment is discharged from the deoxygenation and dechlorination outlet 12, and enters the hydrolysis device 2 through the hydrolysis inlet 21 of the hydrolysis device 2, and is hydrolyzed in the hydrolysis device 2 to convert the organic sulfur COS in the blast furnace gas into hydrogen sulfide to obtain the raw gas after hydrolysis treatment, and the raw gas after hydrolysis treatment enters the adsorption device 3 through the adsorption inlet 31 of the adsorption device 3, and the hydrogen sulfide is adsorbed in the adsorption device 3, thereby achieving desulfurization of the raw gas after hydrolysis treatment to obtain desulfurized blast furnace gas.

[0034] The system of the present invention also includes a heat exchange device 4, which is provided with a heat exchange air inlet 41 and a heat exchange air outlet 42. The heat exchange air inlet 41 is respectively connected to the adsorption air inlets 31 of the four adsorption devices 3. The adsorption air outlets 32 of the four adsorption devices 3 are merged and divided into two paths, one of which is used for recovering the purified blast furnace gas, and the other is connected to the heat exchange air inlet 41 through an air pump 5 via a regeneration air inlet pipeline 6. Part of the purified blast furnace gas is heated by the heat exchange device 4 and enters the adsorption device 3. When the adsorbent in the adsorption device 3 adsorbs hydrogen sulfide to saturation, the adsorbent in the adsorption device 3 can be regenerated. For example, the partially desulfurized clean blast furnace gas is transported by the air pump 5 and enters the heat exchanger 4 from the heat exchange air inlet 41 of the heat exchanger 4 to heat the clean blast furnace gas to 180-200° C. The heated clean blast furnace gas is discharged from the heat exchange air outlet 42 of the heat exchanger 4 and enters the adsorption device 3 from the adsorption air inlet 31. The adsorbent is regenerated by the reducing atmosphere in the clean blast furnace gas. At the same time, the specific amount of oxygen (0.1-0.3%) contained in the clean blast furnace gas can oxidize the adsorbed hydrogen sulfide into elemental sulfur at 180-200° C., so that the sulfur species are changed from harmful waste to usable elemental sulfur. The blast furnace gas containing elemental sulfur is then collected from the adsorption air outlet 32 ​​of the adsorption device 3 to the adsorption regeneration air outlet pipeline 7 for discharge. Optionally, when four adsorption devices 3 are arranged in parallel, the raw gas after hydrolysis treatment first passes through one of the adsorption devices 3. When the adsorbent in the adsorption device 3 is saturated with hydrogen sulfide, the raw gas after hydrolysis treatment is controlled by valves to pass only through the remaining three adsorption devices 3 to obtain clean blast furnace gas after desulfurization. The partially desulfurized clean blast furnace gas is transported by the air pump 5 and enters the heat exchange device 4 from the heat exchange air inlet 41 of the heat exchange device 4 to heat and raise the temperature of the clean blast furnace gas. The heated and heated clean blast furnace gas is discharged from the heat exchange air outlet 42 of the heat exchange device 4 and enters the corresponding adsorption device 3 from the adsorption air inlet 31 of the adsorption device 3 that is saturated with adsorption. The adsorbent is regenerated by using the reducing atmosphere (such as hydrogen, carbon monoxide, etc.) in the blast furnace gas. At the same time, the oxygen in the blast furnace gas oxidizes the hydrogen sulfide into elemental sulfur, and then is discharged from the adsorption air outlet 32 ​​of the adsorption device 3. When the adsorbents in the other three adsorption devices 3 have reached saturation with hydrogen sulfide, the adsorbents therein can be regenerated, and at the same time another adsorption device 3 can be started to continue the desulfurization adsorption treatment of the blast furnace gas. By alternating the use in this way, the continuous desulfurization process of the blast furnace gas can be realized.

[0035] Application examples:

[0036] 120000Nm 3 / h, 7KPa, 90℃, COS concentration is 80mg / m 3The blast furnace gas enters from the blast furnace gas inlet 11 of the deoxidation and dechlorination device 1, and after passing through the deoxidation and dechlorination device 1 equipped with a supported ruthenium metal catalyst with a height-to-diameter ratio of 0.1, its pressure drop is about 200Pa, the oxygen content is less than 0.005%, and the chlorine content is less than 2mg / m 3 The blast furnace gas after deoxidation and dechlorination enters the hydrolysis device 2, which is equipped with a COS hydrolysis catalyst 7% Na2CO3 / Al2O3 with a height-to-diameter ratio of 0.1. The COS concentration in the deoxidation and dechlorination after hydrolysis is less than 1 mg / m 3 The pressure drop is about 200Pa, and the logistics enters the adsorption device 3 equipped with Fe2O3 / Al2O3-C3N4 adsorbent with a height-to-diameter ratio of 0.1. The concentration of H2S in the blast furnace gas after desulfurization by the adsorption device is less than 1mg / m 3 , and its pressure drop is about 200Pa. A small portion of clean oxygen-free and sulfur-free blast furnace gas is heated to 190°C by a heat exchanger to regenerate the adsorbent. After regeneration, when the temperature drops below 80°C, the valve is switched to alternate with the other three adsorption devices 3.

[0037] After 10 cycles of adsorption and regeneration tests as described above, the concentration of H2S in blast furnace gas is less than 2 mg / m 3 .

[0038] Any matters not described in the present invention are applicable to the prior art.

[0039] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, the obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A large volume, normal pressure, low resistance blast furnace gas desulfurization system, comprising a dechlorination and deoxygenation device (1), a hydrolysis device (2) and an adsorption device (3), wherein the dechlorination and deoxygenation device (1) is provided with a blast furnace gas inlet (11) and a deoxygenation and dechlorination outlet (12), the hydrolysis device (2) is provided with a hydrolysis inlet (21) and a hydrolysis outlet (22), the adsorption device (3) is provided with an adsorption inlet (31) and an adsorption outlet (32), the deoxygenation and dechlorination outlet (12) is communicated with the hydrolysis inlet (21), and the hydrolysis outlet (22) is communicated with the adsorption inlet (31); characterized in that: The dechlorination and deoxygenation device (1), the hydrolysis device (2) and the adsorption device (3) are all three-layer structures, and are provided with an upper air pressure buffer zone (a), a packing layer (b) and a lower air pressure buffer zone (c) in order from top to bottom; the blast furnace gas inlet (11), the hydrolysis inlet (21) and the adsorption inlet (31) are respectively arranged on one side wall of the upper air pressure buffer zone (a) of the device in which they are located; and the deoxygenation and dechlorination outlet (12), the hydrolysis outlet (22) and the adsorption outlet (32) are respectively arranged on the other side wall of the lower air pressure buffer zone (c) of the device in which they are located.

2. The atmospheric volume, normal pressure, low resistance blast furnace gas desulfurization system according to claim 1 is characterized in that: The volume ratio of the upper air pressure buffer zone (a), the packing layer (b) and the lower air pressure buffer zone (c) is 1:(0.8-2):

1.

3. The atmospheric volume, normal pressure, low resistance blast furnace gas desulfurization system according to claim 2 is characterized in that: The packing layer (b) in the dechlorination and deoxygenation device (1) has a filling height-to-diameter ratio of 1:10 to 1:

30.

4. The atmospheric volume, normal pressure, low resistance blast furnace gas desulfurization system according to claim 3 is characterized in that: The upper and lower ends of the packing layer (b) are provided with grids (d) respectively, and the packing in the packing layer (b) is fixed between the upper air pressure buffer zone (a) and the lower air pressure buffer zone (c) through the two grids (d).

5. The atmospheric volume, normal pressure, low resistance blast furnace gas desulfurization system according to claim 4 is characterized in that: The dechlorination and deoxygenation device (1) is arranged above the hydrolysis device (2), and the adsorption device (3) is arranged below the hydrolysis device (2). A heat insulation layer (e) is provided between the dechlorination and deoxygenation device (1) and the hydrolysis device (2), and between the hydrolysis device (2) and the adsorption device (3).

6. The atmospheric volume, normal pressure, low resistance blast furnace gas desulfurization system according to claim 5, characterized in that: The packing layer (b) in the dechlorination and deoxygenation device (1) is used to fill a deoxidizer; the packing layer (b) in the hydrolysis device (2) is used to fill a hydrolysis agent; and the packing layer (b) in the adsorption device (3) is used to fill an adsorbent.

7. The atmospheric volume, normal pressure, low resistance blast furnace gas desulfurization system according to any one of claims 5-6, characterized in that: The system comprises at least two adsorption devices (3) arranged in parallel, each of the adsorption devices (3) being arranged vertically stacked below the hydrolysis device (2), and the heat insulation layer (e) being arranged between two adjacent adsorption devices (3).

8. The atmospheric volume, normal pressure, low resistance blast furnace gas desulfurization system according to claim 7, characterized in that: The system comprises four adsorption devices (3) arranged in parallel, wherein three of the adsorption devices (3) arranged in parallel are used for adsorption treatment of blast furnace gas, and the other one is used for standby or for regenerating the adsorbent.

9. The atmospheric volume, normal pressure, low resistance blast furnace gas desulfurization system according to claim 8, characterized in that: The system further comprises a heat exchange device (4), wherein the heat exchange device (4) is provided with a heat exchange air inlet (41) and a heat exchange air outlet (42), wherein the heat exchange air inlet (41) is respectively connected to the adsorption air inlets (31) of the four adsorption devices (3), and the adsorption air outlets (32) of the four adsorption devices (3) are combined and divided into two paths, one path being used for recovering the purified blast furnace gas, and the other path being connected to the heat exchange air inlet (41) through an air pump (5) via a regeneration air inlet pipeline (6). Part of the purified blast furnace gas is heated by the heat exchange device (4) and then enters the adsorption device (3), and is used for regenerating the saturated adsorbent in the adsorption device (3).

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