A blast furnace gas fine desulfurization system and method

Abstract

The present application relates to a blast furnace gas fine desulfurization system and method, the system includes: a blast furnace gas main inlet pipeline, a dechlorination hydrolysis tower, an intermediate gas pipeline, a desulfurization tower and a blast furnace gas main outlet pipeline; the interior of the dechlorination hydrolysis tower is a plurality of dechlorination hydrolysis units along the longitudinal direction, each dechlorination hydrolysis unit includes a dechlorination packing layer and a hydrolysis packing layer; the top of each layer of dechlorination hydrolysis unit has a first branch gas inlet pipeline connected to the blast furnace gas main inlet pipeline, and the bottom of each layer of dechlorination hydrolysis unit has a first branch gas outlet pipeline connected to the intermediate gas pipeline; the interior of the desulfurization tower is a plurality of desulfurization units along the longitudinal direction, the top of each layer of desulfurization unit has a second branch gas inlet pipeline connected to the intermediate gas pipeline, and the bottom of each layer of desulfurization unit has a second branch gas outlet pipeline connected to the blast furnace gas main outlet pipeline. The present application combines the pretreatment and hydrolysis of the dechlorination hydrolysis tower into one tower, reduces the floor space, and realizes non-stop material replacement.

Description

Technical Field

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

[0002] The SO2 2 In the past, the problem of excessive sulfur content was solved by end-of-pipe treatment, that is, desulfurization of flue gas after blast furnace gas combustion. 2 The emission requirements have been greatly improved, and end-of-pipe treatment can no longer meet the emission requirements. This requires steel companies to achieve fine desulfurization of blast furnace gas from the source.

[0003] Prior art CN111944563A discloses a novel blast furnace gas desulfurization system, including a vertical tower body, wherein the vertical tower body includes a dust interception device and a dry dechlorination device, the output end of the vertical tower body is connected to a hydrolysis tower, the output end of the hydrolysis tower is provided with a desulfurization tower, and the output end of the desulfurization tower is connected to an auxiliary desulfurization and dehydration device.

[0004] The above-mentioned prior art has the following defects: the dry dechlorination device and the hydrolysis tower exist separately, occupying too much area, and it is also impossible to realize online replacement of the materials in the dry dechlorination device, the hydrolysis tower and the desulfurization tower.

[0005] Therefore, in view of the above problems, it is necessary to design a blast furnace gas fine desulfurization system and method to solve the technical problems raised above. Summary of the invention

[0006] Based on this, a blast furnace gas fine desulfurization system and method are provided. The dechlorination hydrolysis tower combines pretreatment and hydrolysis into one tower, which reduces the floor space and can also achieve material replacement without stopping the machine.

[0007] In order to solve the above problems, the present application provides a blast furnace gas fine desulfurization system, comprising: a blast furnace gas main inlet pipeline, a dechlorination hydrolysis tower, an intermediate gas pipeline, a desulfurization tower and a blast furnace gas main outlet pipeline; the blast furnace gas main inlet pipeline is connected to the dechlorination hydrolysis tower, the dechlorination hydrolysis tower is connected to the desulfurization tower through the intermediate gas pipeline, and the desulfurization tower is connected to the blast furnace gas main outlet pipeline; wherein the interior of the dechlorination hydrolysis tower is divided into a plurality of independent dechlorination hydrolysis units along the longitudinal direction, each of the dechlorination hydrolysis units comprises an upper dechlorination packing layer and a lower hydrolysis packing layer; each layer of the dechlorination hydrolysis unit comprises a plurality of dechlorination packing layers, ... The top of each chlorine hydrolysis unit is provided with a first branch gas inlet pipeline connected to the main blast furnace gas inlet pipeline, and the bottom of each layer of the dechlorination hydrolysis unit is provided with a first branch gas outlet pipeline connected to the intermediate gas pipeline; the interior of the desulfurization tower is divided into a plurality of independent desulfurization units along the longitudinal direction, and each of the desulfurization units includes a desulfurization packing layer; the top of each layer of the desulfurization unit is provided with a second branch gas inlet pipeline connected to the intermediate gas pipeline, and the bottom of each layer of the desulfurization unit is provided with a second branch gas outlet pipeline connected to the main blast furnace gas outlet pipeline.

[0008] A preferred solution is to further include a heating heat exchanger and a cooling heat exchanger; the heating heat exchanger is arranged at the front end of the blast furnace gas main inlet pipeline, and is used to heat the blast furnace gas to 60-90°C; the cooling heat exchanger is arranged on the intermediate gas pipeline, and is used to cool the blast furnace gas after hydrolysis conversion to 10-50°C.

[0009] A preferred solution is that the end of the first branch gas inlet pipeline located in the dechlorination and hydrolysis unit and the end of the second branch gas inlet pipeline located in the desulfurization unit are both provided with gas distributors; the end of the first branch gas outlet pipeline located in the dechlorination and hydrolysis unit and the end of the second branch gas outlet pipeline located in the desulfurization unit are both provided with gas collectors.

[0010] A preferred solution is that the gas distributor includes an inlet pipe, a top cone plate, a bottom sealing plate and a distribution ring connected between the top cone plate and the bottom sealing plate; the upper end of the inlet pipe is connected to the first branch gas inlet pipeline or the second branch gas inlet pipeline, the lower end of the inlet pipe is connected to the upper end of the top cone plate, the lower end of the top cone plate is connected to the upper end of the distribution ring, and the lower end of the distribution ring is connected to the bottom sealing plate; the distribution ring includes three different specifications of a first orifice plate, a second orifice plate and a third orifice plate, the inner diameter ФL1 of the first orifice plate is larger than the inner diameter ФL2 of the second orifice plate, the inner diameter ФL2 of the second orifice plate is larger than the inner diameter ФL3 of the third orifice plate Inner diameter ФL3; each adjacent upper and lower two first orifice plates are spaced apart and constitute a group; the second orifice plate and the third orifice plate are respectively inserted between two adjacent groups of the first orifice plates, and the second orifice plate is arranged above the third orifice plate; a gap is left between the second orifice plate and the first orifice plate above and below it for side air outlet; a gap is left between the third orifice plate and the first orifice plate above and below it for side air outlet; wherein, the first orifice plate, the second orifice plate and the third orifice plate are connected in series by ribs; and / or, a plurality of air equalizing holes are opened at the bottom of the bottom sealing plate, and the inner diameter ФL4 of the air equalizing holes is smaller than the inner diameter ФL3 of the third orifice plate.

[0011] A preferred solution is that the gas collector includes a gas collecting shell, one of the sides of the gas collecting shell is provided with an outlet pipe, and the outlet pipe is connected to the first branch gas outlet pipe or the second branch gas outlet pipe; at least one side of the gas collecting shell is provided with equidistant and evenly distributed long air intake holes; the top surface of the gas collecting shell is provided with air intake circular holes arranged in a circular array.

[0012] A preferred solution is that each layer of the dechlorination and hydrolysis units and each layer of the desulfurization units are provided with an online loading device with the same structure; the online loading device includes a feeding bin, the bottom of which is connected to a longitudinal feeding vertical pipe, and the feeding vertical pipe is provided with a feeding valve for controlling the feeding; the end of the feeding vertical pipe is connected to a transversely arranged storage pipe, one end of the storage pipe is provided with an inflation interface, and the other end of the storage pipe is connected to an inclined feeding pipe that penetrates into the dechlorination and hydrolysis unit or the desulfurization unit and is inclined.

[0013] A preferred solution is that the dechlorination hydrolysis tower and the desulfurization tower are respectively provided with online unloading devices of the same structure; the online unloading device includes a waste bin, and the bottom of each layer of the dechlorination hydrolysis unit or the desulfurization unit is respectively connected to an inclined unloading inclined pipe, and the unloading inclined pipe is provided with a unloading valve for controlling the unloading; the end of the unloading inclined pipe passes through the dechlorination hydrolysis unit or the desulfurization unit and is respectively connected to a main unloading pipe, and the main unloading pipe is connected to the waste bin.

[0014] A preferred solution is that a disperser is provided at the end of the feed inclined tube, and the disperser is used to evenly distribute the material on the tower cross section; the disperser includes a first disperser shell, a second disperser shell and a third disperser shell, and the first disperser shell, the second disperser shell and the third disperser shell are all trapezoidal in shape and have upper and lower end openings; the upper end of the first disperser shell is connected to the end of the feed inclined tube; the second disperser shell is sleeved in the first disperser shell and has gaps around it for feeding, and the third disperser shell is sleeved in the second disperser shell and has gaps around it for feeding. There is a gap for material discharge, and a dispersing head arranged in a triangular shape is also arranged inside the third disperser shell; the first disperser shell, the second disperser shell, the third disperser shell and the dispersing head are connected and fixed by ribs; and / or, the second disperser shell is also provided with a circle of second material stop ring on the inner circumferential wall at the lower end, and the wall surface of the second material stop ring is set as an inclined surface, and the second material stop ring is used to change the falling trajectory of the material; the third disperser shell is also provided with a circle of third material stop ring on the inner circumferential wall at the lower end, and the wall surface of the third material stop ring is set as an inclined surface, and the third material stop ring is used to change the falling trajectory of the material.

[0015] The present application also provides a blast furnace gas fine desulfurization method, using the blast furnace gas fine desulfurization system, comprising the following steps:

[0016] The blast furnace gas to be purified is introduced into the blast furnace gas main inlet pipeline to obtain the first raw gas;

[0017] The first raw gas is heated to 60-90°C by a temperature-raising heat exchanger to obtain a second raw gas;

[0018] The heated second raw gas is passed into a dechlorination and hydrolysis tower, where dechlorination and hydrolysis reactions are carried out to obtain a third raw gas;

[0019] The third raw gas after hydrolysis is cooled to 10-50° C. by a cooling heat exchanger to obtain a fourth raw gas;

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

[0021] Preferably, it further includes the following steps: an on-line feeding step and / or an on-line discharging step:

[0022] Wherein, the on-line feeding step includes the following steps:

[0023] Open the feeding valve and close the discharging valve at the same time. The agent in the feeding bin is fed into the storage pipe through the feeding vertical pipe.

[0024] Open the gas source, blow air into the storage pipe through the inflation interface, blow the agent in the storage pipe into the feeding inclined pipe, and add the agent to the dechlorination hydrolysis tower or the desulfurization tower respectively through the feeding inclined pipe.

[0025] After the feeding is completed, close the feeding valve.

[0026] The on-line discharging step includes the following steps:

[0027] Open the discharging valve and close the feeding valve at the same time. The ineffective agent in the dechlorination hydrolysis tower or the desulfurization tower flows through the discharging inclined pipe to the total discharging pipeline for collection. After the ineffective agent is loaded into the waste bin to a certain amount by the total discharging pipeline, close the discharging valve.

[0028] Open the discharging valve at the bottom of the waste bin. The ineffective agent is transported to the automatic baler by the screw conveyor for baling and external transportation. After the discharging is completed, close the discharging valve.

[0029] This application has at least the following beneficial effects:

[0030] In the prior art, the coal gas fine desulfurization device is mainly configured with a single pretreatment tower, a hydrolysis tower, and a desulfurization tower. However, it cannot achieve refueling without stopping the machine, and the downtime is relatively long, which has a greater impact on the users at the back end of the blast furnace gas. Although there are also configurations with multiple pretreatment towers, hydrolysis towers, and desulfurization towers to achieve standby functions, it will result in a large floor area for the fine desulfurization system. In this application, the pretreatment and hydrolysis are combined into one tower, that is, the dechlorination hydrolysis tower. Multiple independent dechlorination hydrolysis units are arranged in the dechlorination hydrolysis tower, and multiple independent desulfurization units are arranged in the desulfurization tower. Thus, one can be used as a standby. When the dechlorination agent, hydrolysis agent, and desulfurization agent of any unit need to be refueled, the unit to be refueled is automatically cut out, and the standby unit is started to achieve refueling without stopping the machine, which has a relatively small impact on the users at the back end of the blast furnace gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of the blast furnace gas fine desulfurization system in this embodiment;

[0032] Figure 2 It is a schematic structural diagram of the dechlorination hydrolysis tower in this embodiment;

[0033] Figure 3 It is a schematic structural diagram of the desulfurization tower in this embodiment;

[0034] Figure 4 Schematic diagram of the partial structure of the dechlorination and hydrolysis unit in this embodiment;

[0035] Figure 5 This is a schematic diagram of the process of the blast furnace gas fine desulfurization system in this embodiment;

[0036] Figure 6 Schematic diagram of the structure of the gas distributor in this embodiment;

[0037] Figure 7 is a cross-sectional top view of the gas distributor in this embodiment;

[0038] Figure 8 is a side schematic diagram of the gas collector in this embodiment;

[0039] Fig. 9 is a schematic diagram of the top surface of the gas collector in this embodiment;

[0040] Fig.10 This is a schematic diagram of the structure of the online charging device in this embodiment;

[0041] Fig.11 This is a schematic diagram of the material flow direction of the disperser in this embodiment;

[0042] Fig.12 This is a schematic diagram of the size and structure relationship of the material dispersing device in this embodiment;

[0043] Fig.13 for Fig.12 AA section diagram in;

[0044] Fig.14 for Fig.12 Schematic diagram of the BB cross section.

[0045] Figure numerals: 10, blast furnace gas main inlet pipeline; 20, dechlorination hydrolysis tower; 21, dechlorination hydrolysis unit; 211, dechlorination packing layer; 212, hydrolysis packing layer; 213, first inert porcelain ball; 22, first branch gas inlet pipeline; 23, first branch gas outlet pipeline; 30, intermediate gas pipeline; 40, desulfurization tower; 41, desulfurization unit; 411, desulfurization packing layer; 412, second inert porcelain ball; 4 ...43, first branch gas outlet pipeline; 44, first branch gas outlet pipeline; 45, first branch gas outlet pipeline; 46, first branch gas outlet pipeline; 47, first branch gas outlet pipeline; 48, first branch gas outlet pipeline; 49, first branch gas outlet pipeline; 50, first branch gas outlet pipeline; 51, first branch gas outlet pipeline; 52, first branch gas outlet pipeline; 53, first branch gas outlet pipeline; 54, first branch gas outlet pipeline; 55, first branch gas outlet pipeline; 56, first branch gas outlet pipeline; 57, first branch gas outlet pipeline; 58, first branch gas outlet pipeline; 59, first branch gas outlet pipeline; 60, first branch gas outlet pipeline; 61, first branch gas outlet pipeline; 62, first branch gas outlet pipeline; 63, first branch gas outlet pipeline; 64, first branch gas outlet pipeline; 65, first branch gas outlet pipeline; 66, first branch gas outlet pipeline; 67, first branch gas outlet pipeline; 68, first branch gas outlet pipeline; 69, first branch gas outlet pipeline; 70, first branch gas outlet pipeline Second branch gas inlet pipeline; 43, second branch gas outlet pipeline; 50, blast furnace gas main outlet pipeline; 60, heating heat exchanger; 70, cooling heat exchanger; 80, gas distributor; 81, inlet pipe; 82, top cone plate; 83, bottom sealing plate; 84, distribution ring; 841, first orifice plate; 842, second orifice plate; 843, third orifice plate; 90, gas collector; 91, gas collection shell; 911, inlet length Strip hole; 912, air inlet round hole; 92, outlet pipe; 100, online loading device; 101, feeding bin; 102, feeding vertical pipe; 103, feeding valve; 104, storage pipe; 105, charging interface; 106, feeding inclined pipe; 107, disperser; 1071, first disperser shell; 1072, second disperser shell; 1073, third disperser shell; 1074, dispersion head; 1075, ribs ; 1076, second material blocking ring; 1077, third material blocking ring; 200, online unloading device; 201, waste bin; 202, unloading inclined pipe; 203, main unloading pipeline; 300, main valve of gas pipeline; 400, first air inlet valve group; 500, first air outlet valve group; 600, second air inlet valve group; 700, second air outlet valve group; 800, main air outlet valve group; 900, automatic baler; 901, screw conveyor. DETAILED DESCRIPTION

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] The embodiment of the present application provides a blast furnace gas fine desulfurization system and method, which integrates the dechlorination reaction section and the hydrolysis reaction section into an integrated design without occupying too much area. At the same time, it can also achieve a multi-use and one-standby operation state. This design can meet the user's needs to replace fillers in the blast furnace gas fine desulfurization system without shutting down the entire system.

[0051] The following is a detailed description of a blast furnace gas fine desulfurization system provided in this embodiment in conjunction with the accompanying drawings. Figure 1-Figure 4 As shown, it includes: a blast furnace gas main inlet pipeline 10, a dechlorination hydrolysis tower 20, an intermediate gas pipeline 30, a desulfurization tower 40 and a blast furnace gas main outlet pipeline 50; the blast furnace gas main inlet pipeline 10 is connected to the dechlorination hydrolysis tower 20, the dechlorination hydrolysis tower 20 is connected to the desulfurization tower 40 through the intermediate gas pipeline 30, and the desulfurization tower 40 is connected to the blast furnace gas main outlet pipeline 50; wherein the interior of the dechlorination hydrolysis tower 20 is divided into a plurality of independent dechlorination hydrolysis units 21 along the longitudinal direction, and each dechlorination hydrolysis unit 21 includes an upper dechlorination packing layer 211 and a lower hydrolysis packing layer 212 (such as Figure 4 As shown in the figure, the top of each layer of dechlorination and hydrolysis unit 21 is provided with a first branch gas inlet pipeline 22 connected to the main blast furnace gas inlet pipeline 10, and the bottom of each layer of dechlorination and hydrolysis unit 21 is provided with a first branch gas outlet pipeline 23 connected to the intermediate gas pipeline 30; the interior of the desulfurization tower 40 is divided into a plurality of independent desulfurization units 41 along the longitudinal direction, each desulfurization unit 41 includes a desulfurization packing layer 411, the top of each layer of desulfurization unit 41 is provided with a second branch gas inlet pipeline 42 connected to the intermediate gas pipeline 30, and the bottom of each layer of desulfurization unit 41 is provided with a second branch gas outlet pipeline 43 connected to the main blast furnace gas outlet pipeline 50.

[0052] In the prior art, a single pretreatment tower, hydrolysis tower, or desulfurization tower cannot be configured to achieve non-stop material replacement, and the downtime is relatively long, which has a significant impact on the back-end users of blast furnace gas. In addition, there is also the possibility of configuring multiple pretreatment towers, hydrolysis towers, and desulfurization towers to achieve backup functions, but this will result in a large area occupied by the fine desulfurization system.

[0053] In the present embodiment, on the one hand, the dechlorination reaction section and the hydrolysis reaction section of the blast furnace gas pretreatment are integrated, and the dechlorination reaction and the hydrolysis reaction are completed in the dechlorination hydrolysis tower 20. This integrated design method of the present application can reduce excessive floor space and is more integrated; on the other hand, the dechlorination hydrolysis tower 20 is divided into a plurality of independent dechlorination hydrolysis units 21 along the longitudinal direction, and each dechlorination hydrolysis unit 21 includes an upper dechlorination packing layer 211 and a lower hydrolysis packing layer 212. The interior of the desulfurization tower 40 is divided into a plurality of independent desulfurization units 41 along the longitudinal direction, and each desulfurization unit 41 includes a desulfurization packing layer 411. In this way, the dechlorination hydrolysis tower 20 and the desulfurization tower 40 can be provided with a standby layer and an operating layer. This design can meet the needs of users to replace packing without shutting down the blast furnace gas fine desulfurization system as a whole. In the independent dechlorination hydrolysis units 21 of the dechlorination hydrolysis tower 20, the blast furnace gas is introduced from the top of each unit and passes through the dechlorination hydrolysis unit 21 in turn. After the desulfurization agent and the hydrolyzing agent are added, the gas is discharged from the bottom of each unit, and the first branch gas outlet pipes 23 of each dechlorination and hydrolysis unit 21 are merged into one; in the independent desulfurization units 41 of the desulfurization tower 40, the gas is taken in from the top of each unit, and after passing through the desulfurizer, the gas is discharged from the second branch gas outlet pipes 43 at the bottom of each unit and merged into one; the hydrolysis tower and the desulfurization tower of the prior art axial tower structure are designed to have blast furnace gas as the bottom intake and the top exhaust, which increases the system resistance. In the embodiment of the present application, the flow direction of the blast furnace gas in the dechlorination and hydrolysis tower 20 is designed as the top in and the bottom out. The gas flow field in this design tower is more uniform than the bottom in and the top out design, which can accurately control the dechlorination and hydrolysis reaction time, make the reaction more sufficient, improve the dechlorination and hydrolysis efficiency, and reduce the system resistance; secondly, the blast furnace gas flow direction of the desulfurization tower 40 is also arranged as the top in and the bottom out. The gas flow field in this design tower is more uniform than the bottom in and the top out design, which can accurately control the desulfurization reaction time, make the reaction more sufficient, improve the desulfurization efficiency, and reduce the system resistance.

[0054] The dechlorination hydrolysis tower 20 is described below:

[0055] Please refer to Figure 1 , Figure 2 as well as Figure 4As shown, the dechlorination hydrolysis tower 20 in the embodiment of the present application adopts a design of three longitudinal independent packing units, that is, it is set to three dechlorination hydrolysis units 21, the three dechlorination hydrolysis units 21 operate independently, and can be set to be two for use and one for standby. When the fine desulfurization system is running, the packing can be replaced without closing the main valve 300 of the system inlet gas pipeline. Each dechlorination hydrolysis unit 21 is composed of a dechlorination packing layer 211, a hydrolysis packing layer 212 and a first inert porcelain ball 213. The dechlorination packing layer 211 is mainly a dechlorinating agent, and the main components are CaO, MgO, and Al 2 O 3 Adding accelerator, the hydrolysis filler layer 212 is mainly a hydrolysis agent, the main component of which is γ-Al 2 O 3 Add accelerator, the main component of the first inert ceramic ball 213 is Al 2 O 3 、SiO 2 The dechlorinating agent and the hydrolyzing agent are isolated by the first inert ceramic ball 213 to avoid mutual influence between the dechlorinating agent and the hydrolyzing agent. A first inert ceramic ball 213 is also laid on the bottom layer to prevent the hydrolyzing agent from directly contacting the Johnson plate on the bottom supporting structure in the dechlorinating and hydrolyzing unit 21 and causing damage.

[0056] Secondly, the first air intake valve group 400 is designed on each of the three inlet pipes of the dechlorination hydrolysis tower 20, i.e., the first branch gas inlet pipe 22. Each first air intake valve group 400 is composed of an electric regulating valve and an electric blind plate valve. The opening of the electric regulating valve is adjusted according to the flow display on the first branch gas inlet pipe 22, so that the amount of gas entering each independent dechlorination hydrolysis unit 21 is the same. The function of the electric blind plate valve is to block the gas to a limited extent, so as to ensure that the gas is blocked from entering the dechlorination hydrolysis unit 21 when the filler is replaced.

[0057] Secondly, first gas outlet valve groups 500 are respectively designed on the three outlet pipes of the dechlorination hydrolysis tower 20, namely the first branch gas outlet pipes 23. Each first gas outlet valve group 500 is composed of an electric regulating valve and an electric blind plate valve, so as to effectively block the three first branch gas outlet pipes 23 from the intermediate gas pipe 30, ensure the independence of the three dechlorination hydrolysis units 21, and realize the three dechlorination hydrolysis units 21 of the dechlorination hydrolysis tower 20 in a standby and dual-purpose operation state.

[0058] The gas flow is designed to flow in from the top and out from the bottom. The gas first reacts with the dechlorinating agent in the upper dechlorinating packing layer 211 to absorb and remove the HCI in the blast furnace gas, preventing the dilute hydrochloric acid formed by HCI from corroding the system components and improving the service life of the gas fine desulfurization device. The gas passing through the dechlorinating packing layer 211 then enters the hydrolysis packing layer 212 in the lower layer. COS and CS in the gas 2 Under the action of the hydrolyzing agent filler, organic sulfur is converted into inorganic sulfur (H 2S) state, creating conditions for the catalytic and adsorption reactions in the downstream desulfurization section.

[0059] The desulfurization tower 40 is described below:

[0060] Please refer to Figure 1 and Figure 4 As shown, the desulfurization tower 40 in this embodiment is designed with two independent packing units, that is, it is set as two desulfurization units 41. The two desulfurization units 41 operate independently and can be set as one for use and one for backup. During the operation of the system, the two desulfurization units 41 can be switched to achieve the replacement of packing without stopping the system.

[0061] The desulfurization unit 41 includes a desulfurization packing layer 411. The desulfurization packing layer 411 uses activated carbon as a desulfurizer. The activated carbon can desulfurize the H2 in the blast furnace gas after hydrolysis and dechlorination. 2 S is oxidized and adsorbed to achieve the purpose of fine desulfurization. Activated carbon has rich microporous structure, large specific surface area (up to 500-1500㎡ per gram), strong adsorption capacity, low operating temperature, simple process, good effect, low cost, and can be used for operation at higher air velocity, especially the development of modified activated carbon such as carbon-based fine desulfurization agent, so that its desulfurization accuracy can reach 0.1mg / Nm 3 The sulfur content can be as high as 50% or more, making it a more attractive desulfurization method. Activated carbon is loaded in the desulfurization tower 40, and a second layer of inert ceramic balls 412 is laid under the activated carbon filler layer to prevent the activated carbon filler from directly contacting the Johnson grid plate. This design overcomes the weakness of the activated carbon being fragile.

[0062] Secondly, the two inlet pipes of the desulfurization tower 40, i.e., the second branch gas inlet pipes 42, are respectively designed with second air intake valve groups 600. Each second air intake valve group 600 is composed of an electric regulating valve and an electric blind plate valve. The opening of the electric regulating valve is adjusted according to the flow display on the second branch gas inlet pipe 42, and the amount of inlet blast furnace gas is adjusted in real time in combination with the gas flow meter, so that the amount of gas entering the desulfurization packing layer 411 is the same, so as to realize a more suitable operation of the desulfurization system under different working conditions, such as one-in-one standby operation or two layers of desulfurization units 41 running at the same time. The function of the electric blind plate valve is to block the gas to a limited extent, so as to ensure that the gas is blocked from entering the desulfurization unit 41 when the packing is replaced.

[0063] Secondly, second gas outlet valve groups 700 are respectively designed on the two outlet pipes of the desulfurization tower 40, namely the second branch gas outlet pipes 43. Each group of second gas outlet valve groups 700 consists of an electric butterfly valve and an electric blind plate valve to achieve effective blocking between the two second branch gas outlet pipes 43 and the blast furnace gas main outlet pipe 50, thereby ensuring the independence of the two desulfurization units 41 and realizing the operation state of one backup and one use of the two desulfurization units 41 of the desulfurization tower 40. Preferably, a main gas outlet valve group 800 is provided on the blast furnace gas main outlet pipe 50.

[0064] The gas flow of the desulfurization tower 40 is arranged to enter upward and exit downward. This design makes the gas flow field in the tower more uniform than the bottom-in and top-out design, and can accurately control the desulfurization reaction time, making the reaction more complete, improving the desulfurization efficiency, and reducing system resistance.

[0065] Please refer to Figure 1 As shown, in this embodiment, it should be noted that the blast furnace gas fine desulfurization system also includes a heating heat exchanger 60 and a cooling heat exchanger 70. The heating heat exchanger 60 is arranged at the front end of the blast furnace gas main inlet pipeline 10, and is used to heat the blast furnace gas from the front end to 60-90°C. The heating of the blast furnace gas has two purposes. One is to convert the saturated blast furnace gas into unsaturated blast furnace gas, so as to avoid the cooling of the blast furnace gas in the rear-end dechlorination hydrolysis tower 20, resulting in the liquid water precipitated and the HCI contained in the blast furnace gas being dissolved into dilute hydrochloric acid. The dilute hydrochloric acid will cause equipment corrosion and affect the service life of the fine desulfurization device. The second is to prevent the dilute hydrochloric acid from affecting the hydrolysis reaction of the hydrolyzing agent in the rear section. The heating heat exchange medium of the heating heat exchanger 60 is steam. An electric regulating valve is provided on the steam inlet pipe of the heating heat exchanger 60. During the heating process, the opening of the electric regulating valve is adjusted according to the temperature display on the downstream gas pipe of the heating heat exchanger 60 to control the temperature of the blast furnace gas within the range of 60-90°C.

[0066] The cooling heat exchanger 70 is arranged on the intermediate gas pipeline 30, and is used to cool the middle section blast furnace gas after hydrolysis conversion to 10-50°C. The cooling of the blast furnace gas has two purposes: one is to convert the unsaturated blast furnace gas after pre-treatment into saturated blast furnace gas, and keep the desulfurizer (activated carbon) in the desulfurization tower 40 in a wet state, in order to ensure the safety of the activated carbon; the other is to adjust the temperature of the activated carbon according to the adsorption of H 2 The reaction curve of S has an optimum temperature in the range of 10-50°C, and its reaction efficiency is optimal. The heat exchange medium of the cooling heat exchanger 70 is circulating cooling water, and an electric regulating valve is provided on the cooling water inlet pipe. The opening of the regulating valve is adjusted according to the temperature on the gas pipeline downstream of the cooling heat exchanger 70, so that the blast furnace gas temperature is controlled within the range of 10-50°C.

[0067] Please refer to Figure 5 As shown, the process flow of the blast furnace gas fine desulfurization system in this embodiment adopts the blast furnace gas fine desulfurization process of "pretreatment + hydrolysis (low temperature) + high sulfur capacity activated carbon dry adsorption desulfurization". The blast furnace gas from the main network of the plant area is firstly heat exchanged by the temperature rising heat exchanger 60 (steam) to raise the temperature of the blast furnace gas to 60-90℃, and then passes through the dechlorination hydrolysis tower 20 to remove COS and CS in the gas. 2According to the desulfurization activated carbon adsorption working temperature test curve and field test verification, the gas after hydrolysis conversion needs to be cooled down to 60-90°C. The desulfurization tower 40 is located downstream of the dechlorination hydrolysis tower 20. The adsorbent arranged in the desulfurization tower 40 is porous activated carbon. The blast furnace gas passes through the filler layer filled with activated carbon particles. The activated carbon has a large specific surface area and a large number of micropores to absorb dust and H 2 S and other substances by physical and chemical adsorption principle, H 2 S removal, achieving total sulfur at the outlet of fine desulfurization device ≤30mg / Nm 3 , ensuring that the blended coal gas meets the stable sulfur dioxide emission standards of the steel rolling heating furnace flue gas.

[0068] The working principle of the hydrolysis stage is: under certain coal gas temperature (60-90°C) and hydrolysis catalyst conditions, the organic sulfur (COS) in the coal gas is converted into H 2 S, its main reaction formula is as follows:

[0069]

[0070] Working principle of adsorption section: Utilize the adsorption capacity and strong catalytic activity of activated carbon to absorb H 2 S and a small amount of O in gas 2 An oxidation reaction occurs, and the elemental S generated by the reaction is adsorbed on the surface of the activated carbon.

[0071] The activated carbon catalytic reaction process is as follows:

[0072]

[0073] The activated carbon desulfurization process is simple, with low operating temperature, good effect and low cost. It can be used for operation at a higher space velocity, especially the development of modified activated carbon such as carbon-based fine desulfurizer, so that the desulfurization accuracy can reach 0.1mg / Nm 3 Below this level, the sulfur capacity can be as high as 50% or more, making it a more attractive desulfurization method.

[0074] Please refer to Figure 2 and Figure 3 As shown, in this embodiment, it is also necessary to explain that the end of the first branch gas inlet pipeline 22 located in the dechlorination hydrolysis unit 21 and the end of the second branch gas inlet pipeline 42 located in the desulfurization unit 41 are respectively provided with a gas distributor 80; the gas distributor 80 arranged in the dechlorination hydrolysis tower 20 and the desulfurization tower 40 distributes the gas evenly on the cross-section inside the tower through the diversion design, avoiding the generation of gas deviation, allowing the gas to react more fully with the dechlorination agent and the hydrolysis agent, thereby improving the utilization rate.

[0075] Please refer to Figure 6 and Figure 7 As shown in one example, the gas distributor 80 includes an inlet pipe 81, a top cone plate 82, a bottom sealing plate 83, and a distribution ring 84 connected between the top cone plate 82 and the bottom sealing plate 83. The distribution ring 84 discharges gas from all sides. The upper end of the inlet pipe 81 is connected to the first branch gas inlet pipeline 22 (such as Figure 2 as shown) or the second branch gas inlet pipeline 42 (as shown Figure 3 At the gas outlet end (as shown), the lower end of the inlet pipe 81 is connected to the upper end of the top cone plate 82, the lower end of the top cone plate 82 is connected to the upper end of the distribution ring 84, and the lower end of the distribution ring 84 is connected to the bottom sealing plate 83, so that the first branch gas inlet pipeline 22 or the second branch gas inlet pipeline 42 introduces the blast furnace gas into the inlet pipe 81, and then introduces it into the distribution ring 84 through the inlet pipe 81, and the distribution ring 84 realizes the effect of uniform gas outlet from the sides around.

[0076] In some embodiments, the distribution ring 84 includes a first orifice plate 841, a second orifice plate 842 and a third orifice plate 843 of three different specifications. The inner diameter ФL1 of the first orifice plate 841 is larger than the inner diameter ФL2 of the second orifice plate 842, and the inner diameter ФL2 of the second orifice plate 842 is larger than the inner diameter ФL3 of the third orifice plate 843. In this embodiment, six first orifice plates 841 are provided, and every two first orifice plates 841 are provided as a group to constitute three groups. The three groups of first orifice plates 841 are arranged in sequence from top to bottom, and the upper and lower first orifice plates 841 in each group are arranged at intervals so that the gas can be discharged from the side.

[0077] The second orifice plate 842 and the third orifice plate 843 are respectively inserted between the two adjacent groups of first orifice plates 841, and the second orifice plate 842 is arranged above the third orifice plate 843; specifically, in this embodiment, the second orifice plate 842 and the third orifice plate 843 are respectively arranged as one, one second orifice plate 842 and one third orifice plate 843 are arranged between the two adjacent groups of first orifice plates 841, and a gap is left between the second orifice plate 842 and the first orifice plate 841 above and below for side air outlet; one third orifice plate 843 is arranged between the two adjacent groups of first orifice plates 841, and a gap is left between the third orifice plate 843 and the first orifice plate 841 above and below for side air outlet, wherein the first orifice plate 841, the second orifice plate 842 and the third orifice plate 843 are connected in series through ribs 85. In addition, a plurality of air-distributing holes are provided at the bottom of the bottom sealing plate 83, and the inner diameter ФL4 of the air-distributing holes is smaller than the inner diameter ФL3 of the third orifice plate 843.

[0078] Thus, the coal gas is introduced from the inlet pipe 81 into the top cone plate 82, and then introduced into the distribution ring 84 from the top cone plate 82, and passes through the first orifice plate 841, the second orifice plate 842 and the third orifice plate 843 from top to bottom in the distribution ring 84, and is discharged from the side gaps formed between the adjacent orifice plates, and the inner diameter ФL1 of the first orifice plate 841 is larger than the inner diameter ФL2 of the second orifice plate 842, and the inner diameter ФL2 of the second orifice plate 842 is larger than the inner diameter ФL3 of the third orifice plate 843. The coal gas will first pass through the first orifice plate 841 with a larger aperture, and then part of it will be discharged from the side, and part of it will flow downward through the second orifice plate 842 with a smaller aperture. Through the effect of diameter change, the coal gas will gather, and then pass through the first orifice plate 841 with a larger aperture again to achieve the diffusion of the coal gas, part of it will be discharged from the side, and part of it will continue to flow downward through the third orifice plate 843 with a smaller aperture. Through the effect of diameter change, the coal gas will gather again, and then pass through the first orifice plate 841 with a larger aperture again to achieve the diffusion of the coal gas, part of it will be discharged from the side, and part of it will continue to flow downward through the bottom sealing plate 83. A small amount of coal gas will flow out from the gas equalizing holes on the bottom sealing plate 83. On the one hand, the bottom sealing plate 83 has gas equalizing holes to prevent the airflow from impacting the bottom sealing plate 83, so that the airflow can flow out. Therefore, the diameters of the first orifice plate 841, the second orifice plate 842 and the third orifice plate 843 become smaller and smaller, which can play a role of holding air and allow the air flow to flow out from the side to achieve the effect of gas uniformity; at the same time, due to the limited height inside the dechlorination hydrolysis tower 20 and the desulfurization tower 40, the distribution ring 84 in this embodiment is set up to allow the gas to diffuse around within the limited height space to achieve the purpose of gas uniformity. The principle of setting the distribution ring 84 is to set obstacles in the flow direction of the gas to change its flow direction from downward direct flow to diffuse around. It can be understood that the blast furnace gas gathers in the distribution ring 84, passes through the annular channel formed by each layer of orifice plate from the sides in turn, and then finally flows out from the sides around to achieve the effect of gas uniformity.

[0079] Of course, the number of the first orifice plate 841 , the second orifice plate 842 , and the third orifice plate 843 in the distribution ring 84 is not limited, and may be set to other numbers in other embodiments.

[0080] Please refer to Figure 1-Figure 3 As shown, in this embodiment, it is also necessary to explain that the end of the first branch gas outlet pipeline 23 located in the dechlorination hydrolysis unit 21 and the end of the second branch gas outlet pipeline 43 located in the desulfurization unit 41 are respectively provided with a gas collector 90. The function of the gas collector 90 is to evenly collect the gas to avoid the occurrence of gas deviation, and the gas distributor 80 and the gas collector 90 are arranged correspondingly up and down, so that the gas and the filler can fully contact and react, thereby improving the utilization rate.

[0081] Please refer to Figure 8 and Fig. 9 As shown, in one example, the gas collector 90 includes a gas collecting shell 91, one of the sides of the gas collecting shell 91 is provided with an outlet pipe 92, and the outlet pipe 92 is connected to the first branch gas outlet pipeline 23 or the second branch gas outlet pipeline 43; at least one side of the gas collecting shell 91 is provided with equidistant and evenly distributed long air inlet holes 911, preferably, the other sides except the side connected with the outlet pipe 92 are provided with equidistant and evenly distributed long air inlet holes 911, and the long air inlet holes 911 are provided on the side to facilitate the gas to enter the gas collecting shell 91 from the side for collection, and the top surface of the gas collecting shell 91 is provided with air inlet circular holes 912 arranged in a circular array, and the air inlet circular holes 912 facilitate the gas to enter the gas collecting shell 91 from the top surface for collection, and the opening ratio of the top is smaller than the opening ratio of the side in a ratio of about 1:10, so that most of the gas enters the gas collecting shell 91 from the side, which is conducive to the smooth flow of gas in the tower.

[0082] Please refer to Figure 1 As shown, in this embodiment, it should also be noted that each layer of dechlorination and hydrolysis unit 21 and each layer of desulfurization unit 41 are provided with an online loading device 100 with the same structure. The online loading device 100 is a closed silo design to avoid dust pollution caused by outsourcing of material powder during loading.

[0083] Please refer to Figure 1 and Fig.10 As shown, in one example, the online loading device 100 includes a feeding bin 101, which is arranged outside the dechlorination hydrolysis tower 20 or the desulfurization tower 40. The bottom of the feeding bin 101 is connected to a longitudinal feeding vertical pipe 102, and a feeding valve 103 for controlling the feeding is arranged on the feeding vertical pipe 102; the end of the feeding vertical pipe 102 is connected to a transversely arranged storage pipe 104, one end of the storage pipe 104 is provided with an inflation interface 105, and the inflation interface 105 is used to connect to an external gas source, and the other end of the storage pipe 104 is connected to a feeding inclined pipe 106 that penetrates into the dechlorination hydrolysis unit 21 or the desulfurization unit 41 and is inclined, and the feeding inclined pipe 106 is inclined downward, and then the material in the feeding inclined pipe 106 will slide downward by gravity to realize the feeding operation.

[0084] Please refer to Figure 10-Figure 14 As shown, in another example, a material disperser 107 is provided at the end of the feed inclined pipe 106, that is, the discharge end, and the material disperser 107 is used to evenly distribute the material on the tower cross section.

[0085] The material dispersing device 107 comprises a first disperser housing 1071, a second disperser housing 1072 and a third disperser housing 1073. The first disperser housing 1071, the second disperser housing 1072 and the third disperser housing 1073 are all in a trapezoidal shape and are provided with upper and lower end openings. The upper end of the first disperser housing 1071 is connected to the end of the feeding inclined tube 106. The second disperser housing 1072 is sleeved in the first disperser housing 1071 and has a gap around it for feeding. The third disperser housing 1073 is sleeved in the second disperser housing 1072 and has a gap around it for feeding. A dispersing head 1074 arranged in a triangular shape is also sleeved in the middle position of the interior of the third disperser housing 1073. The dispersing head 1075 and the inner wall of the third disperser housing 1073 have a gap around it for feeding. The first disperser housing 1071, the second disperser housing 1072, the third disperser housing 1073 and the dispersing head 1074 are connected and fixed by ribs 1075.

[0086] Among them, the upper inner diameter of the first disperser housing 1071 and the upper inner diameter of the third disperser housing 1073 are both ФL2, the upper inner diameter of the second disperser housing 1072 is ФL1, and the lower inner diameter of the disperser head 1074 is ФL3, ФL1 is set larger than ФL2, and ФL2 is set larger than ФL3. The lower inner diameter D5 of the first disperser housing 1071 is larger than the lower inner diameter D4 of the second disperser housing 1072, and the lower inner diameter D4 of the second disperser housing 1072 is larger than the lower inner diameter D2 of the third disperser housing 1073. Therefore, through the above-mentioned structural setting, it can be realized that the disperser head 1074 is set in the third disperser housing 1073, the third disperser housing 1073 is set in the second disperser housing 1072, and the second disperser housing 1072 is set in the first disperser housing 1071, so as to achieve the function of uniform gas discharge.

[0087] The second disperser shell 1072 is also provided with a second material blocking ring 1076 on the inner wall at the lower end. The wall surface of the second material blocking ring 1076 is set as an inclined surface. The second material blocking ring 1076 is used to change the falling trajectory of the material. The inner diameter D3 of the second material blocking ring 1076 is smaller than the lower end inner diameter D4 of the second disperser shell 1072, and larger than the lower end inner diameter D2 of the third disperser shell 1073.

[0088] The third disperser shell 1073 is also provided with a circle of third material blocking ring 1077 on the inner wall at the lower end. The wall surface of the third material blocking ring 1077 is set as an inclined surface. The third material blocking ring 1077 is used to change the falling trajectory of the material. The inner diameter D1 of the third material blocking ring 1077 is smaller than the lower end inner diameter D2 of the third disperser shell 1073.

[0089] In this embodiment, the online loading device 100 is designed as a closed silo to avoid dust pollution caused by outsourcing of material powder during loading. A feeding valve 103 and an air charging interface 105 are arranged at the bottom of the feeding silo 101. The material in the feeding silo 101 falls into the feeding inclined pipe 106 through the feeding vertical pipe 102, and the material is sent into the tower through the feeding inclined pipe 106. A material disperser 107 is arranged at the end of the feeding inclined pipe 106 to make the material evenly distributed on the tower cross section. This design is a humanized setting, which reduces labor and avoids workers working in a dusty state.

[0090] Please refer to Figure 1-Figure 3 As shown, in this embodiment, it should also be noted that the dechlorination hydrolysis tower 20 and the desulfurization tower 40 are respectively provided with online unloading devices 200 with the same structure.

[0091] In one example, the online unloading device 200 includes a waste bin 201, and the bottom of each layer of the dechlorination and hydrolysis unit 21 or the desulfurization unit 41 is respectively connected to an inclined unloading inclined pipe 202, and a unloading valve (not shown in the figure) for controlling the unloading is arranged on the unloading inclined pipe 202. The ends of the unloading inclined pipe 202 pass through the dechlorination and hydrolysis unit 21 or the desulfurization unit 41 and are respectively connected to the main unloading pipeline 203, and the main unloading pipeline 203 is connected to the waste bin 201. Therefore, when unloading, the waste in the dechlorination and hydrolysis unit 21 or the desulfurization unit 41 is collected into the main unloading pipeline 203 through the unloading inclined pipe 202, and then transported to the waste bin 201 for collection by the main unloading pipeline 203.

[0092] In another example, a material collecting device 204 (such as Figure 4 As shown in the figure, the material collecting container 204 is funnel-shaped and is used to collect the material evenly. When unloading, the waste material and the first inert ceramic ball 213 and the second inert ceramic ball 412 will flow into the material collecting container 204 for collection at the same time, thereby realizing unloading.

[0093] In another example, a discharge valve (not shown in the figure) and a screw conveyor 901 are set at the bottom of the waste bin 201. When discharging, the discharge valve is opened, and the waste in the waste bin 201 falls into the screw conveyor 901, and then is transported to the automatic baler 900 by the screw conveyor 901 for packaging and transportation. The use of the automatic baler 900 reduces the difficulty of unloading work while reducing labor costs and transportation costs.

[0094] The level meter of the waste bin 201 is interlocked with the discharge valve, and the level meter of the waste bin 201 is interlocked with the automatic packaging machine 900 to realize automatic packaging of by-products, as follows:

[0095] The level meter of the waste bin 201 sends a high material level signal to the discharge valve 203 to automatically close, and at the same time the high material level signal is sent to the automatic baler 900;

[0096] After receiving the high material level signal from the waste bin 201, the automatic baler 900 triggers the baler inlet valve opening signal, the screw conveyor pneumatic signal, and the discharge valve opening signal in sequence, and the triggering signals are sequentially separated by 10 seconds. The starting sequence of the automatic baler 900 is reverse to the material to prevent the system from being stuck and damaged due to the presence of materials in the system when each link is started.

[0097] When the baler's ton bag is full signal is triggered, the discharge valve closing signal, screw conveyor stop signal, and baler inlet valve closing signal are triggered in sequence, and the triggering signals are separated by 10 seconds. The baler system stops in the same direction as the material to prevent the system from being stuck and damaged when each link is restarted due to the presence of materials in the system.

[0098] When a low material level signal of the waste bin 201 is triggered during the automatic packaging process, an opening signal of the discharge valve 203 is triggered and the automatic packaging operation is stopped.

[0099] The present application also provides a method for fine desulfurization of blast furnace gas, which is performed using the above-mentioned blast furnace gas fine desulfurization system, and includes the following steps:

[0100] Step 1, the blast furnace gas to be purified is introduced into the blast furnace gas main inlet pipeline 10 to obtain the first raw gas;

[0101] Step 2, the first raw gas is heated to 60-90° C. by a temperature-raising heat exchanger 60 to obtain a second raw gas;

[0102] Step 3, the heated second raw gas is passed into the dechlorination hydrolysis tower 20, and dechlorination reaction and hydrolysis reaction are carried out in the dechlorination hydrolysis tower 20 to obtain a third raw gas;

[0103] Step 4: The third raw gas after hydrolysis is cooled to 10-50° C. by a cooling heat exchanger 70 to obtain a fourth raw gas;

[0104] Step 5: The fourth raw gas after cooling is introduced into the desulfurization tower 40, and the inorganic sulfur in the fourth raw gas is converted into elemental sulfur or metal sulfide through the adsorption of the desulfurizer to obtain purified blast furnace gas.

[0105] In step 3,

[0106] Confirm that the operation status of the dechlorination hydrolysis tower 20 is two-in-one, confirm that the electric blind plate valves at the inlet and outlet of the standby dechlorination hydrolysis unit 21 are closed, and nitrogen pressure is maintained for the standby dechlorination hydrolysis unit 21;

[0107] The total flow of the imported gas is measured by the flow meter on the total inlet pipeline 10 of the blast furnace gas, and the 1 / 2 value is calculated;

[0108] The inlet pipeline flow meter values ​​of the two operating states of the dechlorination hydrolysis tower 20 are interlocked with the 1 / 2 value of the total gas flow of the blast furnace gas total inlet pipeline 10;

[0109] The fluctuation signals of the flow meter values ​​of the inlet pipelines of the dechlorination hydrolysis tower 20 in two operating states are interlocked with the opening signals of the electric regulating valves of the inlet pipelines of the dechlorination hydrolysis tower 20 in two operating states;

[0110] The amount of gas entering the two dechlorination and hydrolysis units 21 is automatically controlled to be the same through the total pipeline flow meter signal, the two inlet pipeline flow meter signals, and the electric regulating valve opening signals on the two inlet pipelines.

[0111] In some embodiments, the following steps are also included: an online feeding step and / or an online unloading step:

[0112] Wherein, the online feeding step comprises the following steps:

[0113] Open the feeding valve 103 and close the discharge valve at the same time, and the material in the feeding bin 101 is fed into the storage pipe 104 through the feeding vertical pipe 102;

[0114] Open the gas source, blow air into the storage pipe 104 through the gas charging interface 105, blow the material in the storage pipe 104 into the feeding inclined pipe 106, and add the material into the dechlorination hydrolysis tower 20 or the desulfurization tower 40 respectively through the feeding inclined pipe 106;

[0115] After the feeding is completed, close the feeding valve 103;

[0116] The online unloading process includes the following steps:

[0117] The discharge valve is opened and the feed valve 103 is closed at the same time, and the spent material in the dechlorination hydrolysis tower 20 or the desulfurization tower 40 flows to the waste bin 201 through the discharge inclined pipe 202. After the spent material is loaded into the waste bin 201 to a certain amount, the discharge valve is closed;

[0118] The discharge valve is opened, and the spent material is transported to the automatic packaging machine 900 through the screw conveyor 901 for packaging and transportation. After the unloading is completed, the discharge valve is closed.

[0119] The technical features of the above embodiments may be combined arbitrarily. 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.

[0120] 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 system, characterized in that: include: A blast furnace gas main inlet pipeline (10), a dechlorination hydrolysis tower (20), an intermediate gas pipeline (30), a desulfurization tower (40) and a blast furnace gas main outlet pipeline (50); the blast furnace gas main inlet pipeline (10) is connected to the dechlorination hydrolysis tower (20), the dechlorination hydrolysis tower (20) is connected to the desulfurization tower (40) via the intermediate gas pipeline (30), and the desulfurization tower (40) is connected to the blast furnace gas main outlet pipeline (50); The interior of the dechlorination hydrolysis tower (20) is divided into a plurality of independent dechlorination hydrolysis units (21) along the longitudinal direction, and each of the dechlorination hydrolysis units (21) comprises an upper dechlorination packing layer (211) and a lower hydrolysis packing layer (212); the top of each layer of the dechlorination hydrolysis unit (21) is provided with a first branch gas inlet pipeline (22) connected to the blast furnace gas main inlet pipeline (10), and the bottom of each layer of the dechlorination hydrolysis unit (21) is provided with a first branch gas outlet pipeline (23) connected to the intermediate gas pipeline (30); The interior of the desulfurization tower (40) is divided into a plurality of independent desulfurization units (41) along the longitudinal direction, and each of the desulfurization units (41) comprises a desulfurization filler layer (411); the top of each layer of the desulfurization unit (41) is provided with a second branch gas inlet pipeline (42) connected to the intermediate gas pipeline (30), and the bottom of each layer of the desulfurization unit (41) is provided with a second branch gas outlet pipeline (43) connected to the blast furnace gas main outlet pipeline (50); The end of the first branch coal gas inlet pipeline (22) located in the dechlorination and hydrolysis unit (21) and the end of the second branch coal gas inlet pipeline (42) located in the desulfurization unit (41) are both provided with a gas distributor (80); The gas distributor (80) comprises an inlet pipe (81), a top cone plate (82), a bottom sealing plate (83), and a distribution ring (84) connected between the top cone plate (82) and the bottom sealing plate (83); The upper end of the inlet pipe (81) is connected to the first branch coal gas inlet pipeline (22) or the second branch coal gas inlet pipeline (42), the lower end of the inlet pipe (81) is connected to the upper end of the top cone plate (82), the lower end of the top cone plate (82) is connected to the upper end of the distribution ring (84), and the lower end of the distribution ring (84) is connected to the bottom sealing plate (83); The distribution ring (84) comprises a first orifice plate (841), a second orifice plate (842) and a third orifice plate (843) of three different specifications; A gap is left between the second orifice plate (842) and the first orifice plate (841) above and below it for side air outlet; A gap is left between the third orifice plate (843) and the first orifice plate (841) above and below it for side air outlet.

2. The blast furnace gas fine desulfurization system according to claim 1, characterized in that: The end of the first branch coal gas outlet pipeline (23) located in the dechlorination and hydrolysis unit (21) and the end of the second branch coal gas outlet pipeline (43) located in the desulfurization unit (41) are both provided with a gas collector (90); The gas collector (90) comprises a gas collection shell (91), one side of the gas collection shell (91) is provided with an outlet pipe (92), and the outlet pipe (92) is connected to the first branch coal gas outlet pipeline (23) or the second branch coal gas outlet pipeline (43); At least one side surface of the gas collection shell (91) is provided with equidistant and evenly distributed long air intake holes (911); The top surface of the gas collection shell (91) is provided with circular air inlet holes (912) arranged in a circular array.

3. The blast furnace gas fine desulfurization system according to claim 1, characterized in that: The inner diameter ΦL1 of the first orifice plate (841) is greater than the inner diameter ΦL2 of the second orifice plate (842), and the inner diameter ΦL2 of the second orifice plate (842) is greater than the inner diameter ΦL3 of the third orifice plate (843); Each adjacent upper and lower two first orifice plates (841) are arranged at intervals and form a group; The second orifice plate (842) and the third orifice plate (843) are respectively inserted between two adjacent groups of the first orifice plates (841), and the second orifice plate (842) is arranged above the third orifice plate (843); wherein the first orifice plate (841), the second orifice plate (842) and the third orifice plate (843) are connected in series via ribs (85); a plurality of air equalizing holes are provided at the bottom of the bottom sealing plate (83), and an inner diameter ФL4 of the air equalizing holes is smaller than an inner diameter ФL3 of the third orifice plate (843).

4. The blast furnace gas fine desulfurization system according to claim 1, characterized in that: The blast furnace gas fine desulfurization system also includes a temperature-raising heat exchanger (60) and a temperature-lowering heat exchanger (70); The temperature-raising heat exchanger (60) is arranged at the front end of the blast furnace gas main inlet pipeline (10) and is used to raise the temperature of the blast furnace gas to 60-90° C.; The cooling heat exchanger (70) is arranged on the intermediate gas pipeline (30) and is used to cool the blast furnace gas after hydrolysis conversion to 10-50°C.

5. The blast furnace gas fine desulfurization system according to claim 1, characterized in that: Each layer of the dechlorination and hydrolysis unit (21) and each layer of the desulfurization unit (41) are provided with an online charging device (100) with the same structure; The online loading device (100) comprises a feeding bin (101), the bottom of which is connected to a longitudinal feeding vertical pipe (102), and a feeding valve (103) for controlling feeding is arranged on the feeding vertical pipe (102); The end of the feed vertical pipe (102) is connected to a transversely arranged feed storage pipe (104), one end of the feed storage pipe (104) is provided with an air charging interface (105), and the other end of the feed storage pipe (104) is connected to an inclined feed pipe (106) which penetrates into the dechlorination hydrolysis unit (21) or the desulfurization unit (41) and is arranged obliquely.

6. The blast furnace gas fine desulfurization system according to claim 5, characterized in that: The dechlorination hydrolysis tower (20) and the desulfurization tower (40) are respectively provided with an online unloading device (200) having the same structure; The online unloading device (200) comprises a waste bin (201), and the bottom of each layer of the dechlorination and hydrolysis unit (21) or the desulfurization unit (41) is respectively connected to an inclined unloading inclined pipe (202), and a unloading valve for controlling unloading is arranged on the unloading inclined pipe (202); The end of the discharge inclined pipe (202) passes through the dechlorination and hydrolysis unit (21) or the desulfurization unit (41) and is respectively connected to a main discharge pipeline (203), and the main discharge pipeline (203) is connected to the waste bin (201).

7. The blast furnace gas fine desulfurization system according to claim 6, characterized in that: A material disperser (107) is provided at the end of the feed inclined tube (106), and the material disperser (107) is used to evenly distribute the material on the tower cross section; The material disperser (107) comprises a first disperser shell (1071), a second disperser shell (1072) and a third disperser shell (1073), wherein the first disperser shell (1071), the second disperser shell (1072) and the third disperser shell (1073) are all in a trapezoidal shape and have upper and lower end surfaces opening; The upper end of the first disperser shell (1071) is connected to the end of the feed inclined tube (106); the second disperser shell (1072) is sleeved in the first disperser shell (1071) and has gaps around it for feeding; the third disperser shell (1073) is sleeved in the second disperser shell (1072) and has gaps around it for feeding; A triangular-shaped dispersion head (1074) is also disposed inside the third disperser housing (1073); The first disperser shell (1071), the second disperser shell (1072), the third disperser shell (1073) and the disperser head (1074) are connected and fixed by ribs (1075); And / or, the second disperser shell (1072) is further provided with a second material blocking ring (1076) on the inner peripheral wall at the lower end, the wall surface of the second material blocking ring (1076) is arranged as an inclined surface, and the second material blocking ring (1076) is used to change the falling trajectory of the material; The third disperser shell (1073) is also provided with a third material retaining ring (1077) on the inner wall at the lower end. The wall surface of the third material retaining ring (1077) is arranged as an inclined surface. The third material retaining ring (1077) is used to change the falling trajectory of the material.

8. A method for fine desulfurization of blast furnace gas, characterized in that: The blast furnace gas fine desulfurization system according to any one of claims 1 to 7 comprises the following steps: The blast furnace gas to be purified is introduced into the blast furnace gas main inlet pipeline (10) to obtain the first raw gas; The first raw gas is heated to 60-90° C. by a temperature-raising heat exchanger (60) to obtain a second raw gas; The heated second raw gas is passed into a dechlorination hydrolysis tower (20), and undergoes dechlorination reaction and hydrolysis reaction in the dechlorination hydrolysis tower (20) to obtain a third raw gas; The third raw gas after hydrolysis is cooled to 10-50° C. by a cooling heat exchanger (70) to obtain a fourth raw gas; The fourth raw gas after cooling is introduced into a desulfurization tower (40), and inorganic sulfur in the fourth raw gas is converted into elemental sulfur or metal sulfide through the adsorption of a desulfurizing agent, thereby obtaining purified blast furnace gas.

9. The method according to claim 8, characterized in that The following steps are also included: an online feeding step and / or an online unloading step: Wherein, the online feeding step comprises the following steps: The feeding valve (103) is opened and the discharge valve is closed at the same time, and the material in the feeding bin (101) is fed into the storage pipe (104) through the feeding vertical pipe (102); Open the gas source, blow air into the storage pipe (104) through the charging interface (105), blow the material in the storage pipe (104) into the feeding inclined pipe (106), and add the material into the dechlorination hydrolysis tower (20) or the desulfurization tower (40) respectively through the feeding inclined pipe (106); After the feeding is completed, close the feeding valve (103); The online unloading step comprises the following steps: The discharge valve is opened and the feed valve (103) is closed at the same time, and the spent materials in the dechlorination hydrolysis tower (20) or the desulfurization tower (40) flow to the main discharge pipeline (203) through the discharge inclined pipe (202) for collection, and the spent materials are loaded into the waste bin (201) by the main discharge pipeline (203) until a certain amount, and then the discharge valve is closed; The discharge valve at the bottom of the waste bin (201) is opened, and the spent material is transported to the automatic packaging machine (900) through the screw conveyor (901) for packaging and transportation. After the unloading is completed, the discharge valve is closed.

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