A blast furnace gas fine desulfurization process system and method

Abstract

The present application relates to a blast furnace gas fine desulfurization process system and method, comprising: a pretreatment device, a temperature rise heat exchanger, a hydrolysis tower and a desulfurization tower connected in sequence; the pretreatment device is used to pretreat the blast furnace gas to be purified; the temperature rise heat exchanger is used to heat the blast furnace gas; the hydrolysis tower is filled with a hydrolyzing agent, the hydrolyzing agent is used to hydrolyze the blast furnace gas, and the organic sulfur in the blast furnace gas is converted into inorganic sulfur; the desulfurization tower is filled with a desulfurizing agent, the desulfurizing agent is used to convert the inorganic sulfur in the blast furnace gas into elemental sulfur or metal sulfide; the hydrolysis tower and the desulfurization tower are respectively provided with an online feeding device, the online feeding device is used to add the hydrolysis agent to the hydrolysis tower and the desulfurization tower; the hydrolysis tower and the desulfurization tower are also respectively provided with an online unloading device, the online unloading device is used to discharge the failed hydrolysis agent in the hydrolysis tower and the failed desulfurizing agent in the desulfurization tower. The present application can realize the requirements of unmanned automatic online feeding and unloading.

Description

Technical Field

[0001] The present application relates to the technical field of coal gas desulfurization, and in particular to a blast furnace coal gas fine desulfurization process system and method. Background Art

[0002] During the ironmaking process of blast furnaces in steel enterprises, blast furnace gas is generated as a byproduct. Blast furnace gas is a combustible gas with a relatively low calorific value, but it is produced in large quantities. It is the most abundant source of self-produced gas fuel for steel enterprises. The main components of blast furnace gas are CO, CO2, N2, etc., and it contains harmful elements such as sulfur and chlorine. Blast furnace gas is usually sent to blast furnace hot blast furnaces, steel rolling heating furnaces, boilers, coke ovens and generator sets as fuel for combustion. During the combustion process of blast furnace gas, its sulfur-containing substances react to generate SO2 and are discharged into the atmosphere. With the increasing upgrading of environmental emission standards, all users of blast furnace gas at the back end need to build a set of terminal desulfurization treatment equipment to meet the SO2 emission standards. The more blast furnace gas user points, the more supporting terminal treatment facilities there are. This has the problems of large area occupied by the terminal treatment equipment, high construction investment, high operating cost and treatment of terminal treatment by-products. Therefore, it is necessary to carry out centralized fine desulfurization of blast furnace gas from the source.

[0003] The source control method adopts the front-end desulfurization process of blast furnace gas, which can reduce the sulfur content in the fuel gas while reducing the amount of waste gas generated by gas combustion. However, the current desulfurization device structure cannot achieve unmanned operation during loading and unloading. The service life of the agent is short and the replacement frequency is high. When changing materials, it is necessary to manually remove the expired agent from the tower outlet and then fill it with fresh agent from the tower feed port. The material changing operation is complicated, the working environment is poor during unloading, and it takes a long time.

[0004] Therefore, it is necessary to design a blast furnace gas fine desulfurization process system and method to solve the technical problems raised above. Summary of the invention

[0005] Based on this, a blast furnace gas fine desulfurization process system and method are provided, which can realize unmanned automatic online feeding and unloading of materials.

[0006] In order to solve the above problems, the present application provides a blast furnace gas fine desulfurization process system, comprising:

[0007] A pretreatment device, a temperature-raising heat exchanger, a hydrolysis tower and a desulfurization tower are connected in sequence; the pretreatment device is used to pretreat the blast furnace gas to be purified; the temperature-raising heat exchanger is used to heat the blast furnace gas treated by the pretreatment device; the hydrolysis tower is filled with a hydrolyzing agent, and the hydrolyzing agent is used to hydrolyze the blast furnace gas and convert the organic sulfur in the blast furnace gas into inorganic sulfur; the desulfurization tower is filled with a desulfurizing agent, and the desulfurizing agent is used to convert the inorganic sulfur in the blast furnace gas into elemental sulfur or metal sulfide; wherein the hydrolysis tower and the desulfurization tower are respectively provided with an online feeding device, and the online feeding device is used to add the hydrolysis agent into the hydrolysis tower and add the desulfurizing agent into the desulfurization tower; the hydrolysis tower and the desulfurization tower are also respectively provided with an online unloading device, and the online unloading device is used to discharge the failed hydrolysis agent in the hydrolysis tower and discharge the failed desulfurizing agent in the desulfurization tower.

[0008] Preferably, the pretreatment device includes a box body, which is provided with a gas inlet and a gas outlet, the gas inlet is used for supplying blast furnace gas to be purified, and the gas outlet is connected to the temperature-raising heat exchanger; the interior of the box body is provided with a high-pressure atomizing alkali spraying area, a process water flushing area, a wire mesh filter area and a compressed gas purge area, which are arranged in sequence along the direction from the gas inlet to the gas outlet; wherein the high-pressure atomizing alkali spraying area is used to spray atomized alkali solution into the box body; the wire mesh filter area is used to filter and dust-remove the blast furnace gas to be purified; the process water flushing area is used to flush, remove dust, cool down and condense the front of the wire mesh filter area; the compressed gas purge area is used to dry the residual water stains on the wire mesh filter area.

[0009] Preferably, the wire mesh filtration area includes a leeward side wire mesh guide grille, a windward side wire mesh guide grille and a wire mesh arranged therebetween; the windward side wire mesh guide grille is arranged close to the process water flushing area; the leeward side wire mesh guide grille is arranged close to the compressed gas purge area.

[0010] Preferably, the first air inlet of the hydrolysis tower is arranged on the side of the tower bottom, the first air outlet is arranged on the side of the tower top, and the flow direction of the blast furnace gas is arranged to be in from the bottom and out from the top; and the first air inlet is connected to the temperature-raising heat exchanger; the second air inlet of the desulfurization tower is arranged on the side of the tower top, the second air outlet is arranged on the side of the tower bottom, and the flow direction of the blast furnace gas is arranged to be in from the top and out from the bottom; the hydrolysis tower and the desulfurization tower form a symmetrical match, and the first air outlet and the second air inlet are connected at the two tower tops.

[0011] Preferably, the hydrolysis tower and the desulfurization tower are both configured as radial tower structures; the radial tower structure is provided with an outer shell, an inner shell and a middle air guide cylinder in sequence from the outside to the inside; the outer shell and the inner shell together form an outer annular gap airflow channel; the inner shell and the middle air guide cylinder together form a material layer; the interior of the middle air guide cylinder is an inner annular gap airflow channel; wherein, the outer wall of the inner shell is provided with an outer ring air permeable net for radially connecting the material layer and the outer annular gap airflow channel; the outer wall of the middle air guide cylinder is provided with an inner ring air permeable net for radially connecting the material layer and the inner annular gap airflow channel.

[0012] Preferably, the first air inlet is arranged on the bottom side of the outer shell of the hydrolysis tower, and the first air outlet is arranged on the top side of the middle air guide cylinder of the hydrolysis tower; the second air inlet is arranged on the top side of the outer shell of the desulfurization tower, and the second air outlet is arranged on the bottom side of the middle air guide cylinder of the desulfurization tower; the first air inlet and the second air outlet are arranged back to back; the first air outlet and the second air inlet are arranged facing each other.

[0013] Preferably, a first feed port is provided at the top of the inner shell of the hydrolysis tower, and a first discharge port is provided at the bottom; the first feed port is connected to the online feeding device of the hydrolysis tower, and the first discharge port is connected to the online unloading device of the hydrolysis tower; a second feed port is provided at the top of the inner shell of the desulfurization tower, and a second discharge port is provided at the bottom; the second feed port is connected to the online feeding device of the desulfurization tower, and the second discharge port is connected to the online unloading device of the desulfurization tower.

[0014] Preferably, the online feeding device comprises: a feeding hopper, a feeding upper sealing valve, a feeding tank and a feeding lower sealing valve are sequentially connected from top to bottom; the feeding tank is also provided with a first automatic nitrogen filling pipeline and a first automatic emptying pipeline; the first automatic nitrogen filling pipeline is used to fill nitrogen into the feeding tank; the first automatic emptying pipeline is used to empty and replace the air or blast furnace gas in the feeding tank;

[0015] And / or, the online unloading device includes: a unloading upper sealing valve, a unloading tank and a unloading lower sealing valve are arranged in sequence from top to bottom; the unloading tank is also provided with a second automatic nitrogen filling pipeline and a second automatic emptying pipeline; the second automatic nitrogen filling pipeline is used to fill nitrogen into the unloading tank; the second automatic emptying pipeline is used to empty and replace the air or blast furnace gas in the unloading tank.

[0016] The present application also provides a blast furnace gas fine desulfurization process method, comprising the following steps:

[0017] The blast furnace gas to be purified is introduced into a pretreatment device, and the blast furnace gas to be purified is subjected to deacidification by spraying alkali solution, dust removal by wire mesh filtration, dust removal by flushing and cooling, and purification by spraying to obtain a first raw gas;

[0018] The first raw gas after pretreatment and temperature reduction is heated to the target temperature by a temperature-raising heat exchanger to obtain the second raw gas;

[0019] The heated second raw gas is passed into a hydrolysis tower, where the organic sulfur in the blast furnace gas is hydrolyzed under the action of a hydrolyzing agent to convert the organic sulfur into inorganic sulfur to obtain a third raw gas;

[0020] The third raw gas after hydrolysis is introduced into a desulfurization tower, and the inorganic sulfur in the blast furnace gas is converted into elemental sulfur or metal sulfide through the adsorption of the desulfurizer to obtain purified blast furnace gas.

[0021] Preferably, the method further comprises the following steps: an online feeding step and / or an online unloading step:

[0022] Wherein, the online feeding step comprises the following steps:

[0023] The feeding conveying device delivers the material to the feeding hopper, opens the upper sealing valve of the feeding and closes the lower sealing valve of the feeding, and after the material is loaded into the feeding tank to a certain amount, closes the upper sealing valve of the feeding;

[0024] Open the first automatic nitrogen filling pipeline and the first automatic emptying pipeline, the first automatic nitrogen filling pipeline fills nitrogen into the feed tank to empty and replace air, and after the first automatic emptying pipeline empties the air, close the first automatic nitrogen filling pipeline and the first automatic emptying pipeline;

[0025] Open the lower sealing valve for feeding, add the feed agent into the hydrolysis tower and the desulfurization tower respectively, and close the lower sealing valve for feeding after the feeding is completed;

[0026] Open the first automatic nitrogen filling pipeline and the first automatic emptying pipeline, the first automatic nitrogen filling pipeline fills nitrogen into the feed tank to empty the replacement gas, and after the first automatic emptying pipeline empties the gas, close the first automatic nitrogen filling pipeline and the first automatic emptying pipeline;

[0027] The online unloading step comprises the following steps:

[0028] Open the upper sealing valve of the discharge and close the lower sealing valve of the discharge at the same time, add the spent material into the discharge tank to a certain amount, and then close the upper sealing valve of the discharge;

[0029] The second automatic nitrogen filling pipeline and the second automatic emptying pipeline are opened, and the second automatic nitrogen filling pipeline fills nitrogen into the unloading tank to empty and replace the coal gas. After the second automatic emptying pipeline empties the coal gas, the second automatic nitrogen filling pipeline and the second automatic emptying pipeline are closed;

[0030] Open the lower sealing valve of the unloading, and discharge the spent material into the unloading conveying device for conveying. After the unloading is completed, close the lower sealing valve of the unloading;

[0031] The second automatic nitrogen filling pipeline and the second automatic emptying pipeline are opened, and the second automatic nitrogen filling pipeline fills nitrogen into the unloading tank to empty and replace the air. After the second automatic emptying pipeline empties the air, the second automatic nitrogen filling pipeline and the second automatic emptying pipeline are closed.

[0032] This application has at least the following beneficial effects:

[0033] 1. The process is simple, the purification effect is high and stable, the system resistance is small, and the operating cost is low;

[0034] 2. The multifunctional pretreatment device sprays alkali solution to deacidify the blast furnace gas, filters the dust through a wire mesh, and flushes and cools the gas to remove dust and acidify it, which greatly improves the deacidification and dust removal effect of the blast furnace gas and further extends the service life of the hydrolyzer;

[0035] 3. The hydrolysis tower and desulfurization tower adopt radial tower structure, and the air is taken in through the outer annular gap airflow channel, and the air is evenly distributed radially along the outer ring air permeable net of the tower, so as to fully contact and react with the materials in the material layer, and then pass through the inner ring air permeable net to discharge from the inner annular gap airflow channel; the gas flow direction of the hydrolysis tower is bottom-in and top-out, and the gas flow direction of the desulfurization tower is top-in and bottom-out. The gas outlet at the top of the hydrolysis tower is compact and symmetrical with the gas inlet at the top of the desulfurization tower, which greatly reduces the system resistance, and the gas distribution is even, which greatly improves the utilization rate of the materials;

[0036] 4. The hydrolysis tower and desulfurization tower are respectively equipped with online feeding devices and the hydrolysis tower and desulfurization tower are respectively equipped with online unloading devices to realize unmanned online material replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the structure of the blast furnace gas fine desulfurization process system in this embodiment;

[0038] Figure 2 Schematic diagram of the structure of the pre-processing device in this embodiment;

[0039] Figure 3 It is a structural schematic diagram of the hydrolysis tower in this embodiment;

[0040] Figure 4 This is a schematic diagram of the structure of the desulfurization tower in this embodiment;

[0041] Figure 5 Schematic cross-sectional view of the desulfurization tower in this embodiment;

[0042] Figure 6 Schematic diagram of the structure of the online feeding device in this embodiment;

[0043] Figure 7It is a schematic diagram of the structure of the online unloading device in this embodiment.

[0044] Figure numerals: 10, pretreatment device; 11, box; 111, gas inlet; 112, gas outlet; 12, high-pressure atomization alkali spraying area; 13, process water flushing area; 14, wire mesh filtration area; 141, leeward side guide grille; 142, windward side guide grille; 143, wire mesh; 15, compressed gas purge area; 16, drainer; 20, heating heat exchanger; 30, hydrolysis tower; 31, first air inlet; 32, first air outlet; 33, first feed inlet; 34, first feed outlet; 40, desulfurization tower; 41, second air inlet; 42, second air outlet; 43, second feed inlet; 44, second feed outlet; 50, online feeding device; 51, feeding hopper; 52, feeding upper sealing valve; 53, feeding tank; 54, feeding lower sealing valve ; 55. The first automatic nitrogen filling pipeline; 56. The first automatic emptying pipeline; 57. The first CO detector; 58. The material level meter of the feed tank; 60. The online unloading device; 61. The upper sealing valve of the unloading; 62. The unloading tank; 63. The lower sealing valve of the unloading; 64. The second automatic nitrogen filling pipeline; 65. The second automatic emptying pipeline; 66. The second CO detector; 67. The material level meter of the unloading tank; 71. The outer shell; 72. The inner shell; 721. The manifold; 722. The main pipeline; 73. The middle air guide cylinder; 74. The outer annular gap air flow channel; 75. The material layer; 76. The inner annular gap air flow channel; 77. The outer ring air permeable net; 78. The inner ring air permeable net; 79. The load-bearing ring; 80. The feeding conveying device; 81. The raw material bin; 90. The unloading conveying device; 91. The waste bin. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0046] It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the present application in a schematic manner, and therefore the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0047] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which this application can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by this application, should still fall within the scope of the technical contents disclosed in this application.

[0048] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0049] The embodiment of the present application provides a blast furnace gas fine desulfurization process system and method, which adopts an online feeding device and an online unloading device to effectively solve the existing blast furnace gas fine desulfurization process's demand for automatic online feeding and unloading of hydrolyzing agent and desulfurizing agent.

[0050] The following is a detailed description of a blast furnace gas fine desulfurization process system provided in this embodiment in conjunction with the accompanying drawings. Figure 1 As shown, the system includes: a pretreatment device 10, a heating heat exchanger 20, a hydrolysis tower 30 and a desulfurization tower 40 connected in sequence; the pretreatment device 10 is used to pretreat the blast furnace gas to be purified; the heating heat exchanger 20 is used to heat the blast furnace gas treated by the pretreatment device 10; the hydrolysis tower 30 is filled with a hydrolyzing agent, and the hydrolyzing agent is used to hydrolyze the blast furnace gas to convert the organic sulfur in the blast furnace gas into inorganic sulfur; the desulfurization tower 40 is filled with a desulfurizing agent, and the desulfurizing agent is used to convert the organic sulfur in the blast furnace gas into inorganic sulfur. The inorganic sulfur in the blast furnace gas is converted into elemental sulfur or metal sulfide to achieve fine desulfurization of the blast furnace gas; wherein, the hydrolysis tower 30 and the desulfurization tower 40 are respectively provided with an online feeding device 50, and the online feeding device 50 is used to add a hydrolyzing agent into the hydrolysis tower 30 and add a desulfurizing agent into the desulfurization tower 40; the hydrolysis tower 30 and the desulfurization tower 40 are also respectively provided with an online unloading device 60, and the online unloading device 60 is used to discharge the spent hydrolyzing agent in the hydrolysis tower 30 and discharge the spent desulfurizing agent in the desulfurization tower 40.

[0051] In this embodiment, it should be noted that, by optimizing the blast furnace gas fine desulfurization process system, the process flow of the entire process system is set as follows: blast furnace gas to be purified → pretreatment device 10 → heating heat exchanger 20 → hydrolysis tower 30 (equipped with online feeding device 50 and online unloading device 60) → desulfurization tower 40 (equipped with online feeding device 50 and online unloading device 60) → purified blast furnace gas, wherein the current multi-stage pretreatment (water spraying + dry pretreatment agent) or cooling and dehumidification pretreatment is optimized to integrate multiple functions. The pretreatment device 10 is integrated into one device, which reduces the equipment, reduces the system resistance, and stably improves the pretreatment effect. It has only one stage of temperature rise and heat exchange, which can reduce the operating energy consumption. By equipping the hydrolysis tower 30 with an online feeding device 50 and an online unloading device 60, and equipping the desulfurization tower 40 with an online feeding device 50 and an online unloading device 60, unmanned operation and automatic real-time online feeding and unloading can be realized, which effectively solves the demand for automatic online feeding and unloading of hydrolysis agent and desulfurization agent in the existing blast furnace gas fine desulfurization process.

[0052] Please refer to Figure 1 and Figure 2 As shown, in this embodiment, it should be noted that the pretreatment device 10 includes a box body 11, and a gas inlet 111 and a gas outlet 112 are provided on the box body 11. The gas inlet 111 is arranged on one side of the box body 11, and the gas outlet 112 is arranged on the opposite side of the box body 11. In other words, the gas inlet 111 and the gas outlet 112 are arranged opposite to each other, and the gas inlet 111 is used for the blast furnace gas to be purified to enter, and the gas outlet 112 is connected to the temperature rising heat exchanger 20 through a pipeline. The interior of the box 11 is arranged in sequence along the direction from the gas inlet 111 to the gas outlet 112 with a high-pressure atomizing alkali spraying area 12, a process water flushing area 13, a wire mesh filtration area 14 and a compressed gas purge area 15. The high-pressure atomizing alkali spraying area 12 is mainly used to spray atomized alkali solution into the box 11. The high-pressure atomizing alkali spraying area 12 can be provided with a spray pipe, which is vertically arranged. One end of the spray pipe extends out of the box 11 for connecting to an external alkali solution conveying device. One end of the spray pipe is located in the box 11 and a spray head can be arranged on the side. Atomized alkali solution is sprayed into the box 11 through the spray head. Preferably, the spray head sprays along the flow direction of the blast furnace gas, that is, sprays in the direction of the gas outlet 112.

[0053] The wire mesh filter area 14 is mainly used for filtering and removing dust from the blast furnace gas to be purified, and includes a leeward side guide grille 141, a windward side guide grille 142 and a wire mesh 143 arranged therebetween. The windward side guide grille 142 is arranged on a side close to the gas inlet 111, and the leeward side guide grille 141 is arranged on a side close to the gas outlet 112. The blast furnace gas to be purified flows toward the middle wire mesh 143 after the guided flow equalization effect of the windward side guide grille 142. After being intercepted and dusted on the wire mesh 143, the gas continues to flow toward the gas outlet 112 after the guided flow equalization effect of the leeward side guide grille 141. Considering the characteristics of blast furnace gas, in order to prevent dust accumulation, an 8-mesh wire mesh 143 with a wire diameter of 0.71 mm and an aperture of 2.46 mm can be selected. The specific setting is not specifically limited in this embodiment.

[0054] The process water flushing area 13 is arranged on the side of the windward guide grille 142 away from the wire mesh 143, and is used to flush, remove dust, cool and condense the front of the wire mesh filter area 14. The process water flushing area 13 is mainly used to wash away the alkali liquid sprayed into the blast furnace gas, and secondly to cool and condense the dust to achieve further dust removal; the process water flushing area 13 can be provided with a flushing pipe, which uses an external pipeline for water supply. The flushing pipe is vertically arranged in the box body 11 and has a plurality of flushing holes arranged from top to bottom on the side facing the wire mesh filter area 14, so as to flush the wire mesh filter area 14.

[0055] The compressed gas purge area 15 is arranged on the side of the leeward guide grille 141 away from the wire mesh 143, and is used to dry the dust and water stains remaining on the wire mesh filter area 14. The compressed gas purge area 15 can be provided with an air blowing pipe, and the air blowing pipe adopts an external pipeline for air supply. The air blowing pipe is vertically arranged in the box body 11 and has a plurality of air blowing holes from top to bottom on the side facing the wire mesh filter area 14, so as to blow and purify the wire mesh filter area 14.

[0056] In some embodiments, a drain port is further provided at the bottom of the box body 11, and the drain port is connected to the drain 16. The drain port discharges the flushing process water in the box body 11 into the drain 16 for collection.

[0057] Therefore, the pretreatment device 10 in this embodiment solves the need for efficient deacidification and dust removal of coal gas before hydrolysis in the existing blast furnace gas fine desulfurization process by adopting a multifunctional pretreatment device for wire mesh filtration and alkali spraying and deacidification. The multifunctional pretreatment device 10 sprays alkali solution for deacidification, wire mesh filtration for dust removal, and flushing and cooling for dust removal and deacidification of blast furnace gas, which greatly improves the deacidification and dust removal effect of blast furnace gas and further extends the service life of the hydrolyzing agent. The pretreatment method of the prior art is to cool the blast furnace gas to 25-30°C through a lithium bromide unit to liquefy the water in the blast furnace gas to play a role in dehumidification, dust removal and deacidification. The pretreatment effect is limited and the energy consumption is large.

[0058] Please refer to Figure 1 As shown, in this embodiment, it should be noted that the temperature-raising heat exchanger 20 is provided with a temperature-raising heat exchanger air inlet and a temperature-raising heat exchanger air outlet, the temperature-raising heat exchanger air inlet is connected to the gas inlet 111 on the box body 11 through a pipeline, and the temperature-raising heat exchanger air outlet is connected to the hydrolysis tower 30 through a pipeline; the temperature-raising heat exchanger 20 is also provided with a steam inlet and a steam outlet, and the steam inlet and the steam outlet are connected as a pair for heating the blast furnace gas after dust removal and deacidification by the pretreatment device 10. The structure of the temperature-raising heat exchanger 20 is a relatively mature technology in this field, and will not be described in detail here.

[0059] Please continue to refer to Figure 1 As shown, in this embodiment, it should be noted that the hydrolysis tower 30 is provided with a first air inlet 31 and a first air outlet 32, the first air inlet 31 is arranged on the side of the tower bottom and bent to the right, and the first air inlet 31 is connected to the temperature-raising heat exchanger 20 through a pipeline; the first air outlet 32 ​​is arranged on the side of the tower top and bent to the left, and the flow direction of the blast furnace gas in the hydrolysis tower 30 is set to enter from the bottom and exit from the top; the desulfurization tower 40 is provided with a second air inlet 41 and a second air outlet 42, the second air inlet 41 is arranged on the side of the tower top and bent to the right, the second air outlet 42 is arranged on the side of the tower bottom and bent to the left, and the flow direction of the blast furnace gas in the desulfurization tower 40 is set to enter from the top and exit from the bottom. The hydrolysis tower 30 and the desulfurization tower 40 form a symmetrical match, and the first air outlet 32 ​​and the second air inlet 41 are connected by a pipeline at the tops of the two towers.

[0060] In some embodiments, the hydrolysis tower 30 and the desulfurization tower 40 are both configured with the same radial tower structure, and the blast furnace gas in the hydrolysis tower 30 flows in from the bottom and out from the top, while the blast furnace gas in the desulfurization tower 40 flows in from the top and out from the bottom. The two towers are compact and symmetrical. The use of coupled symmetrical hydrolysis tower 30 and desulfurization tower 40 can optimize and reduce the bending path of the gas pipeline, reduce system resistance, and effectively solve the existing blast furnace gas fine desulfurization process requirements for low system resistance and uniform gas distribution.

[0061] The structures of the hydrolysis tower 30 and the desulfurization tower 40 are described in detail below. Since the hydrolysis tower 30 and the desulfurization tower 40 are both configured as the same radial tower structure, the radial tower structure of the hydrolysis tower 30 is used as an example in this embodiment. Figure 3As shown, the radial tower structure of the hydrolysis tower 30 is provided with an outer shell 71, an inner shell 72 and a middle gas guide cylinder 73 from the outside to the inside, the outer shell 71 is arranged in a cylindrical shape and is arranged vertically, the lower end of the outer shell 71 is arranged in a funnel shape to facilitate the diffusion of blast furnace gas, the inner shell 72 is arranged in a cylindrical shape and is arranged vertically, the upper end of the inner shell 72 is arranged in a trapezoidal shape, the lower end of the inner shell 72 is arranged to be compatible with the lower end of the outer shell 71 and is also funnel-shaped, and an outer annular gap gas is formed between the inner shell 72 and the outer shell 71. The inner shell 72 has a vertical outer wall provided with an outer ring air permeable net 77, and the outer ring air permeable net 77 is used to radially connect the agent layer 75 and the outer annular gap air flow channel 74; the middle air guide cylinder 73 is vertically arranged in the middle position of the inner shell 72, and the middle air guide cylinder 73 and the inner shell 72 are surrounded to form the agent layer 75, and the interior of the middle air guide cylinder 73 is the inner annular gap air flow channel 76, and the outer wall of the middle air guide cylinder 73 is provided with an inner ring air permeable net 78, and the inner ring air permeable net 78 is used to radially connect the agent layer 75 and the inner annular gap air flow channel 76. Therefore, the hydrolysis tower 30 and the desulfurization tower 40 in this embodiment adopt a radial tower structure, and the air is uniformly distributed radially along the outer ring air permeable net 77 of the tower through the outer annular gap air flow channel 74, fully contacting and reacting with the agent in the agent layer 75, and then passing through the inner ring air permeable net 78 and venting from the inner annular gap air flow channel 76.

[0062] In one feasible manner, the first air inlet 31 of the hydrolysis tower 30 is arranged on the bottom side of the outer shell 71, and is bent to the right to be connected to the temperature-raising heat exchanger 20 through a pipeline. The first air outlet 32 ​​of the hydrolysis tower 30 is arranged on the top side of the middle air guide cylinder 73, and is bent to the left to pass through the inner shell 72.

[0063] Please refer to Figure 4 As shown, the main structure of the radial tower structure of the desulfurization tower 40 and the radial tower structure of the hydrolysis tower 30 are basically the same. The difference in some embodiments is that the second air inlet 41 of the desulfurization tower 40 is arranged on the top side of the outer shell 71, and is bent to the right and arranged opposite to the first air outlet 32 ​​of the hydrolysis tower 30, and the second air inlet 41 and the first air outlet 32 ​​are connected through a pipeline. The bottom of the middle air guide cylinder 73 of the desulfurization tower 40 is connected to the bottom space of the outer shell 71, and the second air outlet 42 of the desulfurization tower 40 is arranged on the bottom side of the outer shell 71, and is bent to the left and arranged opposite to the first air inlet 31 of the hydrolysis tower 30. The bottom of the outer shell 71 is funnel-shaped and the outer shell 71 is circumferentially closed between the top position of the funnel and the inner shell 72 to divide the area between the outer shell 71 and the inner shell 72 into two parts, the upper part is the outer annular gap airflow channel 74, and the lower part is connected to the bottom of the middle air guide cylinder 73 for blast furnace gas circulation.

[0064] Therefore, in this embodiment, the hydrolysis tower 30 and the desulfurization tower 40 adopt a radial tower structure, and the gas is uniformly distributed radially along the outer ring air permeable net 77 of the tower through the outer annular gap airflow channel 74, fully contacting and reacting with the material in the material layer 75, and then passing through the inner ring air permeable net 78 and out of the inner annular gap airflow channel 76. The gas flow direction of the hydrolysis tower 30 is bottom-in and top-out, and the gas flow direction of the desulfurization tower 40 is top-in and bottom-out. The top gas outlet of the hydrolysis tower 30 and the top gas inlet of the desulfurization tower 40 are compact and symmetrical, which greatly reduces the system resistance, and the gas distribution is uniform, which greatly improves the utilization rate of the material. In the prior art, the hydrolysis tower 30 and the desulfurization tower 40 adopt an axial tower, the blast furnace gas is unevenly distributed, there is a tower height difference between the gas outlet of the hydrolysis tower 30 and the gas inlet of the desulfurization tower 40, the pipeline path between the two towers is complicated, and the system resistance is increased.

[0065] Please refer to Figure 3 and Figure 4 As shown, in some embodiments, a load-bearing ring 79 is provided in the material layer 75 , and when fillers are loaded in the material layer 75 , the load-bearing ring 79 can bear the weight of the fillers loaded in the material layer 75 .

[0066] In some embodiments, the material layer 75 of the hydrolysis tower 30 is used to fill the hydrolysis agent, which has certain anti-oxidation and anti-chlorine poisoning capabilities, and can ensure that it will not powder or break when used under normal working conditions. The hydrolysis agent is composed of a carrier and an active component. The carrier is one or more of aluminum oxide, cerium oxide, silicon oxide, and zirconium oxide, and the active component is one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium oxalate, potassium oxalate, sodium sulfate, and potassium sulfate.

[0067] In some embodiments, the material layer 75 in the desulfurization tower 40 is used to fill the desulfurizer, which is composed of an active component and a carrier. The active component is one or more of iron oxide, zinc oxide, manganese oxide, and copper oxide, and the carrier is one or more of activated carbon, aluminum oxide, cerium oxide, silicon oxide, and zirconium oxide.

[0068] Please refer to Figure 1 and Figure 3 As shown, in the present embodiment, it is also necessary to explain that the top of the inner shell 72 of the hydrolysis tower 30 is set as the first feed port 33, and the bottom is set as the first discharge port 34. The first feed port 33 and the first discharge port 34 are both connected to the material layer 75. The upper part of the first feed port 33 is connected to the online feeding device 50, and the lower part of the first discharge port 34 is connected to the online unloading device 60.

[0069] Please refer to Figure 1 and Figure 4 As shown, the top of the inner shell 72 of the desulfurization tower 40 is set as the second feed inlet 43, and the bottom of the inner shell 72 of the desulfurization tower 40 is connected to the second feed inlet 43 through a circumferentially arranged manifold 721 (such as Figure 5The main pipeline 722 is connected to the main pipeline 722, the bottom of which passes through the outer shell 71 and the end is set as the second discharge port 44, the second feed port 43 is connected to the material layer 75, the upper part of the second feed port 43 is connected to the online feeding device 50, and the lower part of the second discharge port 44 is connected to the online unloading device 60. The online feeding device 50 feeds the material layer 75 through the second feed port 43, and the spent material in the material layer 75 is finally converged to the main pipeline 722 through the manifold 721 of the inner shell 72 to flow out. In the desulfurization tower 40, the inner shell 72 is divided into two parts, the upper and lower parts are disconnected at the position where the bottom of the middle air guide cylinder 73 is connected to the bottom space of the outer shell 71 for blast furnace gas circulation, and the upper and lower parts of the inner shell 72 are connected through the manifold 721.

[0070] Please refer to Figure 1 and Figure 6 As shown, in the present embodiment, it is also necessary to explain that the online feeding device 50 includes: a feeding hopper 51, a feeding upper sealing valve 52, a feeding tank 53 and a feeding lower sealing valve 54 which are connected in sequence from top to bottom through pipelines. The feeding hopper 51 is used to temporarily store the material delivered from the feeding conveying device 80, the feeding upper sealing valve 52 is used to control the material in the feeding hopper 51 to enter the feeding tank 53, the feeding tank 53 is used to store the material flowing down from the feeding hopper 51, and the feeding lower sealing valve 54 is used to control the material in the feeding tank 53 to flow into the first feed port 33 or the second feed port 43.

[0071] In some embodiments, the feeding tank 53 is further provided with a first automatic nitrogen filling pipeline 55 and a first automatic emptying pipeline 56. The first automatic nitrogen filling pipeline 55 is used to fill nitrogen into the feeding tank 53, and the first automatic emptying pipeline 56 is used to empty and replace the air or blast furnace gas in the feeding tank 53. The first automatic emptying pipeline 56 is provided with a first CO detector 57, and the first CO detector 57 is used to monitor the CO concentration in the feeding tank 53.

[0072] In some embodiments, a feeding tank level meter 58 is also provided on the feeding tank 53, and the feeding tank level meter 58 is used to monitor the upper material level and the lower material level of the feeding tank 53. When the feeding hopper 51 feeds the feeding tank 53, when the feeding tank level meter 58 detects that the feeding reaches the upper material level, it indicates that the feeding reaches the specified amount at this time, and the upper sealing valve 52 of the feeding is controlled to be closed, and the feeding is stopped; when the feeding tank 53 discharges the material into the material layer 75, when the feeding tank level meter 58 detects that the feeding reaches the lower material level, it indicates that the material in the feeding tank 53 is insufficient, and the lower sealing valve 54 of the feeding is controlled to be closed, and the discharge is stopped.

[0073] Please refer to Figure 1 and Figure 7As shown, the online unloading device 60 includes: a unloading upper sealing valve 61, a unloading tank 62 and a unloading lower sealing valve 63 which are connected in sequence from top to bottom through pipelines. The unloading upper sealing valve 61 is used to control the flow of spent material in the material layer 75 into the unloading tank 62, the unloading tank 62 is used to store spent material, and the unloading lower sealing valve 63 is used to control the outflow of spent material in the unloading tank 62.

[0074] In some embodiments, the unloading tank 62 is further provided with a second automatic nitrogen filling pipeline 64 and a second automatic emptying pipeline 65; the second automatic nitrogen filling pipeline 64 is used to fill nitrogen into the unloading tank 62, and the second automatic emptying pipeline 65 is used to empty and replace the air or blast furnace gas in the unloading tank 62. The second automatic emptying pipeline 65 is provided with a second CO detector 66, and the second CO detector 66 is used to monitor the CO concentration in the unloading tank 62.

[0075] In some embodiments, a unloading tank level meter 67 is further provided on the unloading tank 62. The unloading tank level meter 67 is used to monitor the upper material level and the lower material level of the unloading tank 62. When the ineffective material in the material layer 75 flows into the unloading tank 62, when the unloading tank level meter 67 monitors that the ineffective material has reached the upper material level, it indicates that the capacity of the unloading tank 62 is insufficient at this time, and the unloading upper sealing valve 61 is controlled to be closed to stop unloading; when the unloading tank 62 is unloading, when the unloading tank level meter 67 monitors that the unloading has reached the lower material level, it indicates that there are not many ineffective materials in the unloading tank 62 at this time, and the unloading lower sealing valve 63 is controlled to be closed to stop unloading.

[0076] Please refer to Figure 1 As shown, in this embodiment, it should be noted that the hydrolyzing agent and the desulfurizing agent are stored in the raw material bin 81. The raw material bin 81 can be one set, shared by the hydrolyzing agent and the desulfurizing agent, or two sets, one for each of the hydrolyzing agent and the desulfurizing agent. The feeding conveying device 80 can be a conveying device such as a bucket lift or a belt. By using the feeding conveying device 80, the hydrolyzing agent in the raw material bin 81 can be conveyed to the online feeding device 50 of the hydrolysis tower 30, and the desulfurizing agent can be conveyed to the online feeding device 50 of the desulfurization tower 40.

[0077] The spent hydrolyzer and desulfurizer are stored in a waste bin 91. The waste bin 91 can be one set, shared by the hydrolyzer and the desulfurizer, or two sets, one for each of the hydrolyzer and the desulfurizer. The unloading conveyor 90 can be a belt, and the spent hydrolyzer and the desulfurizer are transported to the waste bin 91 by using the unloading conveyor 90. The spent hydrolyzer and the desulfurizer are then packaged in the waste bin 91 by a baler.

[0078] In this embodiment, unmanned online material replacement can be achieved through the online feeding device 50 provided on the hydrolysis tower 30 and the desulfurization tower 40 and the online unloading device 60 provided on the hydrolysis tower 30 and the desulfurization tower 40. In the prior art, the replacement of hydrolysis agent and desulfurization agent requires manual removal of the expired material from the tower discharge port and loading of the fresh material into the tower from the tower feed port. The material replacement frequency and manual material replacement operation are complicated, time-consuming, and the working environment is poor.

[0079] In an embodiment of the application, a blast furnace gas fine desulfurization process is also provided, comprising the following steps:

[0080] Step 1: The blast furnace gas to be purified is introduced into the pretreatment device 10, and the blast furnace gas to be purified is subjected to deacidification by spraying alkali solution, dust removal by wire mesh filtration, flushing, cooling, dust removal and deacidification, and purification by spraying through the pretreatment device 10 to obtain the first raw gas;

[0081] Step 2: The first raw gas after pretreatment and cooling is heated to a target temperature such as 60-100° C. by a heating heat exchanger 20 to obtain a second raw gas;

[0082] Step 3: The heated second raw gas is introduced into the hydrolysis tower 30, where the organic sulfur in the blast furnace gas is hydrolyzed under the action of a hydrolyzing agent to convert the organic sulfur COS into inorganic sulfur H2S, thereby obtaining a third raw gas;

[0083] Step 4: The third raw gas after hydrolysis is introduced into the desulfurization tower 40, and the inorganic sulfur H2S in the blast furnace gas is converted into elemental sulfur or metal sulfide through the adsorption of the desulfurizer to obtain the purified blast furnace gas.

[0084] It also includes online filling and online unloading steps:

[0085] Step 5 is an online feeding step: the feeding conveying device 80 delivers the material to the feeding hopper 51, opens the upper sealing valve 52 for feeding and closes the lower sealing valve 54 for feeding, and loads the material into the feeding tank 53. The feeding tank level meter 58 monitors the upper material level of the feeding tank 53, closes the upper sealing valve 52 for feeding, opens the first automatic nitrogen filling pipeline 55 and the first automatic emptying pipeline 56, and fills nitrogen into the feeding tank 53 through the first automatic nitrogen filling pipeline 55 to empty and replace the air, and empties the air in the feeding tank 53 through the first automatic emptying pipeline 56. After emptying, close the first automatic nitrogen filling pipeline 55 and the first automatic emptying pipeline 56, open the lower sealing valve 54 for feeding, and feed the material into the hydrolysis tower 30 from the first feeding port 33 at the top or into the desulfurization tower 40 from the second feeding port 43. The feeding tank level meter 58 monitors the lower material level of the feeding tank 53, closes the feeding lower sealing valve 54, opens the first automatic nitrogen filling pipeline 55 and the first automatic emptying pipeline 56, and fills nitrogen into the feeding tank 53 through the first automatic nitrogen filling pipeline 55 to empty the replacement gas, and empties the blast furnace gas in the feeding tank 53 through the first automatic emptying pipeline 56. After emptying, the CO concentration in the feeding tank 53 is monitored according to the first CO detector 57. When the CO safety concentration is monitored, the first automatic nitrogen filling pipeline 55 and the first automatic emptying pipeline 56 are closed.

[0086] Step 6: Online unloading step: open the upper sealing valve 61 and close the lower sealing valve 63, load the spent material into the unloading tank 62, the unloading tank level meter 67 monitors the upper material level of the unloading tank 62, close the upper sealing valve 61, open the second automatic nitrogen filling pipeline 64 and the second automatic emptying pipeline 65, fill nitrogen into the unloading tank 62 through the second automatic nitrogen filling pipeline 64 to empty and replace the blast furnace gas, and empty the blast furnace gas in the unloading tank 62 through the second automatic emptying pipeline 65. After the gas is emptied, monitor the CO concentration in the unloading tank 62 according to the second CO detector 66. When the monitoring reaches CO safety concentration, close the second automatic nitrogen filling pipeline 64 and the second automatic emptying pipeline 65, open the unloading lower sealing valve 63, and discharge the invalid material into the unloading conveying device 90. The unloading tank level meter 67 monitors the lower material level of the unloading tank 62, closes the unloading lower sealing valve 63, opens the second automatic nitrogen filling pipeline 64 and the second automatic emptying pipeline 65, and fills nitrogen into the unloading tank 62 through the second automatic nitrogen filling pipeline 64 to empty and replace the air, and empties the air in the unloading tank 62 through the second automatic emptying pipeline 65. After the air is emptied, close the second automatic nitrogen filling pipeline 64 and the second automatic emptying pipeline 65.

[0087] The feasibility of the blast furnace gas fine desulfurization process system and method of the present application is illustrated by Examples 1-3 below:

[0088] Example 1

[0089] Blast furnace gas volume 80000Nm 3 / h, 40-65℃, COS concentration in coal gas 180mg / Nm 3 、Hydrogen sulfide H2S concentration 30mg / Nm 3 The blast furnace gas enters from the gas inlet of the pretreatment device, and is subjected to alkali spraying deacidification, wire mesh filtration dust removal, flushing cooling dust removal and deacidification. The pretreated first raw gas is heated to 60-100°C by a temperature rising heat exchanger to obtain a second raw gas. The second raw gas enters the hydrolysis tower from the outer annular gap airflow channel and fully contacts and reacts with the hydrolysis agent β-Al2O3+ active components in the tower. The hydrolysis conversion efficiency is ≥99%. After hydrolysis, a third raw gas with a COS concentration of <2mg / m3 is formed. The third raw gas enters the desulfurization tower from the outer annular gap airflow channel. The inorganic sulfur H2S in the third raw gas is fully contacted and adsorbed with the desulfurization agent iron oxide-based adsorbent in the tower. After desulfurization, the H2S concentration in the blast furnace gas is <1mg / m 3 .

[0090] After 168 hours of pretreatment, hydrolysis and desulfurization test as described above, the total sulfur concentration (in terms of sulfur element) in blast furnace gas is less than 1.5 mg / m 3 .

[0091] Example 2

[0092] Blast furnace gas volume 120000Nm 3 / h, 45℃, COS concentration in coal gas 100mg / Nm 3 、Hydrogen sulfide H2S concentration 20mg / Nm 3 The blast furnace gas enters the gas inlet of the pretreatment device, and is subjected to alkali spraying deacidification, wire mesh filtration dust removal, flushing cooling dust removal and deacidification. The pretreated first raw gas is heated to 60-100°C by a temperature rising heat exchanger to obtain the second raw gas. The second raw gas enters the hydrolysis tower from the outer annular gap airflow channel and fully contacts and reacts with the hydrolysis agent Mg2CO3 / La-Al2O3 in the tower. The hydrolysis conversion efficiency is ≥99%, and the COS concentration formed after hydrolysis is <1mg / m 3 The third raw gas enters the desulfurization tower from the outer annular gap gas flow channel. The inorganic sulfur H2S in the third raw gas is fully contacted and adsorbed by the desulfurization agent activated carbon-based adsorbent in the tower. The H2S concentration in the blast furnace gas after desulfurization is less than 1.2mg / m 3 .

[0093] After 168 hours of pretreatment, hydrolysis and desulfurization test as described above, the total sulfur concentration (in terms of sulfur element) in blast furnace gas is less than 1.8 mg / m 3 .

[0094] Example 3

[0095] Blast furnace gas volume 160000Nm 3 / h, 30-60℃, COS concentration in coal gas 150mg / Nm 3 、Hydrogen sulfide H2S concentration 20mg / Nm 3 The blast furnace gas enters the gas inlet of the pretreatment device, and is subjected to alkali spraying deacidification, wire mesh filtration dust removal, flushing cooling dust removal and deacidification. The pretreated first raw gas is heated to 60-100°C by a temperature rising heat exchanger to obtain the second raw gas. The second raw gas enters the hydrolysis tower from the outer annular gap airflow channel and fully contacts and reacts with the hydrolysis agent Al2O3+ active components in the tower. The hydrolysis conversion efficiency is ≥99%, and the COS concentration formed after hydrolysis is <1mg / m 3 The third raw gas enters the desulfurization tower from the outer annular gap gas flow channel. The inorganic sulfur H2S in the third raw gas is fully contacted and adsorbed by the desulfurizer in the tower. The H2S concentration in the blast furnace gas after desulfurization is less than 1mg / m 3 .

[0096] After 168 hours of pretreatment, hydrolysis and desulfurization test as described above, the total sulfur concentration (in terms of sulfur element) in blast furnace gas is less than 2 mg / m 3 .

[0097] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A blast furnace gas fine desulfurization process system, characterized in that: include: A pretreatment device (10), a temperature-raising heat exchanger (20), a hydrolysis tower (30) and a desulfurization tower (40) connected in sequence; The pretreatment device (10) is used to pretreat the blast furnace gas to be purified; The temperature-raising heat exchanger (20) is used to heat the blast furnace gas treated by the pretreatment device (10); The hydrolysis tower (30) is filled with a hydrolyzing agent, and the hydrolyzing agent is used to hydrolyze the blast furnace gas to convert the organic sulfur in the blast furnace gas into inorganic sulfur; The desulfurization tower (40) is filled with a desulfurizer, and the desulfurizer is used to convert the inorganic sulfur in the blast furnace gas into elemental sulfur or metal sulfide; The hydrolysis tower (30) and the desulfurization tower (40) are respectively provided with an online feeding device (50), and the online feeding device (50) is used to add a hydrolyzing agent into the hydrolysis tower (30) and to add a desulfurizing agent into the desulfurization tower (40); The hydrolysis tower (30) and the desulfurization tower (40) are also respectively provided with an online unloading device (60), and the online unloading device (60) is used to discharge the spent hydrolysis agent in the hydrolysis tower (30) and the spent desulfurization agent in the desulfurization tower (40); The first air inlet (31) of the hydrolysis tower (30) is arranged on the side of the tower bottom, and the first air outlet (32) is arranged on the side of the tower top, and the flow direction of the blast furnace gas is arranged to be bottom-in and top-out; and the first air inlet (31) is connected to the temperature-raising heat exchanger (20); The second air inlet (41) of the desulfurization tower (40) is arranged on the side of the tower top, and the second air outlet (42) is arranged on the side of the tower bottom, and the flow direction of the blast furnace gas is arranged to be in from the top and out from the bottom; The hydrolysis tower (30) and the desulfurization tower (40) are symmetrically matched, and the first gas outlet (32) and the second gas inlet (41) are connected at the tops of the two towers; The hydrolysis tower (30) and the desulfurization tower (40) are both configured as radial tower structures; The radial tower structure is provided with an outer shell (71), an inner shell (72) and a middle air guide cylinder (73) in sequence from the outside to the inside; The outer shell (71) and the inner shell (72) are enclosed to form an outer annular gap airflow channel (74); The inner shell (72) and the middle air guide cylinder (73) are surrounded to form a material layer (75); The interior of the middle air guide cylinder (73) is an inner annular gap airflow channel (76); Wherein, the outer wall of the inner shell (72) is provided with an outer ring air permeable net (77) for radially connecting the material layer (75) and the outer annular gap air flow channel (74); The outer wall of the middle air guide cylinder (73) is provided with an inner ring air permeable net (78) for radially connecting the material layer (75) and the inner annular gap air flow channel (76); The blast furnace gas fine desulfurization process system includes online feeding step and online unloading step: The online feeding step includes the following steps: The feeding conveying device (80) delivers the material to the feeding hopper (51), opens the upper sealing valve (52) and closes the lower sealing valve (54) at the same time, and after the material is loaded into the feeding tank (53) to a certain amount, closes the upper sealing valve (52); The first automatic nitrogen filling pipeline (55) and the first automatic emptying pipeline (56) are opened, the first automatic nitrogen filling pipeline (55) fills nitrogen into the feed tank (53) to empty and replace air, and after the first automatic emptying pipeline (56) has emptied the air, the first automatic nitrogen filling pipeline (55) and the first automatic emptying pipeline (56) are closed; Open the lower sealing valve (54) for feeding, and add the feed agent into the hydrolysis tower (30) and the desulfurization tower (40) respectively. After the feeding is completed, close the lower sealing valve (54) for feeding; The first automatic nitrogen filling pipeline (55) and the first automatic emptying pipeline (56) are opened, the first automatic nitrogen filling pipeline (55) fills nitrogen into the replenishment tank (53) to empty the replacement gas, and after the first automatic emptying pipeline (56) has emptied the gas, the first automatic nitrogen filling pipeline (55) and the first automatic emptying pipeline (56) are closed; The online unloading step comprises the following steps: Open the upper sealing valve (61) of the discharge and close the lower sealing valve (63) of the discharge at the same time, add the spent material agent into the discharge tank (62) to a certain amount, and then close the upper sealing valve (61) of the discharge; The second automatic nitrogen filling pipeline (64) and the second automatic emptying pipeline (65) are opened, the second automatic nitrogen filling pipeline (64) fills nitrogen into the unloading tank (62) to empty and replace the coal gas, and after the second automatic emptying pipeline (65) has emptied the coal gas, the second automatic nitrogen filling pipeline (64) and the second automatic emptying pipeline (65) are closed; The lower sealing valve (63) of the unloading is opened, and the spent material is discharged into the unloading conveying device (90) for conveying. After the unloading is completed, the lower sealing valve (63) of the unloading is closed; The second automatic nitrogen filling pipeline (64) and the second automatic emptying pipeline (65) are opened, and the second automatic nitrogen filling pipeline (64) fills nitrogen into the unloading tank (62) to empty and replace air. After the second automatic emptying pipeline (65) has emptied the air, the second automatic nitrogen filling pipeline (64) and the second automatic emptying pipeline (65) are closed.

2. The blast furnace gas fine desulfurization process system according to claim 1 is characterized in that: The pretreatment device (10) comprises a housing (11), the housing (11) being provided with a gas inlet (111) and a gas outlet (112), the gas inlet (111) being used for admitting blast furnace gas to be purified, and the gas outlet (112) being connected to the temperature-raising heat exchanger (20); The interior of the box (11) is provided with a high-pressure atomization alkali spraying area (12), a process water washing area (13), a wire mesh filtering area (14) and a compressed gas purging area (15) arranged in sequence from the coal gas inlet (111) to the coal gas outlet (112); Wherein, the high-pressure atomizing alkali spraying area (12) is used to spray atomized alkali solution into the box (11); The wire mesh filter area (14) is used to filter and remove dust from the blast furnace gas to be purified; The process water flushing area (13) is used to flush, remove dust, cool and condense the wire mesh filtering area (14); The compressed gas blowing area (15) is used to blow dry the water stains remaining on the wire mesh filtering area (14).

3. The blast furnace gas fine desulfurization process system according to claim 2 is characterized in that: The wire mesh filtering area (14) comprises a leeward side guide grille (141), a windward side guide grille (142) which are arranged opposite to each other, and a wire mesh (143) arranged therebetween; The windward side guide grille (142) is arranged close to the process water flushing area (13); The leeward-side guide grille (141) is arranged close to the compressed gas purge area (15).

4. The blast furnace gas fine desulfurization process system according to claim 1, characterized in that: The first air inlet (31) is arranged on the bottom side of the outer shell (71) of the hydrolysis tower (30), and the first air outlet (32) is arranged on the top side of the middle air guide cylinder (73) of the hydrolysis tower (30); The second air inlet (41) is arranged on the top side of the outer shell (71) of the desulfurization tower (40), and the second air outlet (42) is arranged on the bottom side of the middle air guide cylinder (73) of the desulfurization tower (40); The first air inlet (31) and the second air outlet (42) are arranged opposite to each other; The first air outlet (32) and the second air inlet (41) are arranged facing each other.

5. The blast furnace gas fine desulfurization process system according to claim 4, characterized in that: The top of the inner shell (72) of the hydrolysis tower (30) is provided with a first feed port (33), and the bottom is provided with a first discharge port (34); the first feed port (33) is connected to an online feeding device (50) of the hydrolysis tower (30), and the first discharge port (34) is connected to an online unloading device (60) of the hydrolysis tower (30); The inner shell (72) of the desulfurization tower (40) is provided with a second feed port (43) at the top and a second discharge port (44) at the bottom; the second feed port (43) is connected to the online feeding device (50) of the desulfurization tower (40), and the second discharge port (44) is connected to the online unloading device (60) of the desulfurization tower (40).

6. The blast furnace gas fine desulfurization process system according to claim 5, characterized in that: The online feeding device (50) comprises: a feeding hopper (51), a feeding upper sealing valve (52), a feeding tank (53) and a feeding lower sealing valve (54) which are sequentially connected from top to bottom; The feed tank (53) is also provided with a first automatic nitrogen filling pipeline (55) and a first automatic emptying pipeline (56); The first automatic nitrogen filling pipeline (55) is used to fill nitrogen into the feed tank (53); The first automatic emptying pipeline (56) is used to empty and replace the air or blast furnace gas in the feed tank (53); and / or, The online unloading device (60) comprises: an upper unloading sealing valve (61), a unloading tank (62) and a lower unloading sealing valve (63) arranged in sequence from top to bottom; The unloading tank (62) is also provided with a second automatic nitrogen filling pipeline (64) and a second automatic emptying pipeline (65); The second automatic nitrogen filling pipeline (64) is used to fill nitrogen into the unloading tank (62); The second automatic emptying pipeline (65) is used to empty and replace the air or blast furnace gas in the unloading tank (62).

7. A blast furnace gas desulfurization process method, according to the blast furnace gas desulfurization process system according to any one of claims 1 to 6, characterized in that: The steps include: The blast furnace gas to be purified is introduced into a pretreatment device (10), and the blast furnace gas to be purified is subjected to deacidification by spraying alkali solution, dust removal by wire mesh filtration, dust removal by flushing and cooling, and purification by spraying to obtain a first raw gas; The first raw gas after pretreatment and temperature reduction is heated to a target temperature by a temperature-raising heat exchanger (20) to obtain a second raw gas; The heated second raw gas is introduced into a hydrolysis tower (30) to hydrolyze organic sulfur in the blast furnace gas under the action of a hydrolyzing agent, thereby converting the organic sulfur into inorganic sulfur to obtain a third raw gas; The hydrolyzed third raw gas is introduced into a desulfurization tower (40), where inorganic sulfur in the blast furnace gas is converted into elemental sulfur or metal sulfide through the adsorption of a desulfurizing agent, thereby obtaining purified blast furnace gas.

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