Compact modular blast furnace gas purification device arrangement method

Abstract

The invention discloses a compact modular blast furnace gas purification device arrangement method, and belongs to the field of blast furnace gas desulfurization / purification, and the method comprises the following steps: dividing a blast furnace gas purification device into a modular hydrolysis device and a modular adsorption device based on a blast furnace gas purification process; stacking the plurality of modular hydrolysis devices and the plurality of modular adsorption devices up and down to obtain a plurality of module groups; and connecting the plurality of module groups in parallel to a gas pipeline to obtain the modularized blast furnace gas purification device. The blast furnace gas purification device is flexible in operation, small in occupied area, good in space adaptability, high in operation rate, high in gas purification efficiency and suitable for upgrading and reconstruction of purification devices of built blast furnaces.

Description

Technical Field

[0001] The invention belongs to the technical field of blast furnace gas desulfurization / purification, and in particular relates to a method for arranging a compact modular blast furnace gas purification device. Background Art

[0002] The desulfurization tower disclosed in the prior art has adsorption modules arranged in sequence from bottom to top, and the blast furnace gas is purified by the catalyst in the module. The prior art blast furnace gas fine desulfurization system includes a dechlorination tower, a hydrolysis tower and a desulfurization tower, which is characterized in that each reactor is connected in series in sequence to purify the blast furnace gas, and the design and layout of the overall system are not mentioned.

[0003] Applying the existing technology to practical applications found that the existing technology still has the following problems: (1) At present, the COS hydrolysis + dry desulfurization process operates stably and has many engineering cases, but it generally has the problems of large floor space and low operating rate. 3 The blast furnace gas generation volume is about 550,000 Nm 3 / h, the loading volume of catalyst and adsorbent of the purification device is about several thousand cubic meters, which occupies a huge area and has complicated loading and unloading operations; (2) The current blast furnace gas purification device is not perfect and there is still a lot of room for improvement. Although the device is nominally modular in design, it is actually the adjustment of the catalyst layer in a single tower. The internal flow field is complex and the pressure drop is large. When facing the gas generation of a large-volume blast furnace, the purification device is bound to be large in scale. Therefore, the present invention proposes a compact modular blast furnace gas purification device layout method. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a compact modular blast furnace gas purification device layout method to solve the above problems existing in the prior art.

[0005] To achieve the above object, the present invention provides a method for arranging a compact modular blast furnace gas purification device, comprising the following steps:

[0006] Based on the blast furnace gas purification process, the blast furnace gas purification device is divided into a modular hydrolysis device and a modular adsorption device;

[0007] Stacking a plurality of the modular hydrolysis devices and a plurality of the modular adsorption devices up and down to obtain a plurality of module groups;

[0008] A plurality of the module groups are connected in parallel to a gas pipeline to obtain a modular blast furnace gas purification device.

[0009] Optionally, the modular blast furnace gas purification device adopts the form of a radial flow reactor.

[0010] Optionally, the main body material of the modular blast furnace gas purification device adopts a carbon steel + external insulation structure;

[0011] Among them, the thickness of the carbon steel is Q345 carbon steel with a specification of 4 to 6 mm, and the external insulation is a rock wool and aluminum silicate fiber felt insulation layer with a thickness of 100 to 200 mm.

[0012] Optionally, the diameter of the modular blast furnace gas purification device is 2.5 to 5.5 meters, and the box height is 4.5 to 9.5 meters.

[0013] Optionally, the process of designing a modular blast furnace gas purification device includes:

[0014] Several of the module groups share the main gas inlet and exhaust ducts, supporting steel structures, gas duct brackets, and charging and discharging channels.

[0015] Optionally, any one of the modular hydrolysis device (1) and the modular adsorption device (6) is provided with an independent gas shut-off valve and an activated carbon shut-off valve.

[0016] Compared with the prior art, the present invention has the following advantages and technical effects:

[0017] The present invention constructs a compact modular blast furnace gas purification device by innovatively dividing the blast furnace gas purification device into a modular hydrolysis device and an adsorption device, and forming a module group by stacking them up and down, and then connecting these module groups in parallel to the gas pipeline. This design significantly improves space utilization and operating efficiency, while reducing floor space and project investment costs. Due to the modular design, the operation of the device is more flexible, easy to maintain and upgrade, and the failure of a single module will not affect the operation of the entire system, thereby improving the stability and reliability of the system. In addition, the compact design of the device reduces the amount of steel structure used, reduces the impact on the environment, and improves the gas purification efficiency, which is of great significance for improving the technical level and economic benefits in the field of blast furnace gas desulfurization / purification. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 It is a schematic diagram of a module group of a hydrolysis device according to an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of an adsorption device module group according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of online and offline module groups according to an embodiment of the present invention;

[0022] Figure 4This is a schematic diagram of a common main inlet and exhaust flue of modules according to an embodiment of the present invention;

[0023] Marking instructions: 1. Modular hydrolysis device; 2. Hydrolysis catalyst fresh feed bin; 3. Hydrolysis catalyst unloading bin; 4. Hydrolysis catalyst feed channel; 5. Hydrolysis catalyst unloading channel; 6. Modular adsorption device; 7. Adsorbent fresh feed bin; 8. Adsorbent unloading bin; 9. Adsorbent feed channel; 10. Adsorbent unloading channel. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0026] Embodiment 1

[0027] The method of catalytic hydrolysis fine desulfurization of blast furnace gas is to cool the blast furnace gas after dust removal to 50-150 degrees Celsius, pass it into a gas-solid catalytic reactor, and hydrolyze the organic sulfur in the blast furnace gas in the presence of water vapor and catalyst to hydrolyze and oxidize the organic sulfur in the blast furnace gas into inorganic sulfur. After the reaction, the gas passes through an inorganic sulfur removal device to remove inorganic sulfur. The blast furnace gas after desulfurization enters the gas pipeline network for use.

[0028] Inorganic sulfur refers to hydrogen sulfide, sulfur dioxide, etc. Inorganic sulfur removal methods include conventional methods such as wet desulfurization (oxidation, chemical absorption, physical absorption and physical-chemical absorption), dry desulfurization (catalytic oxidation, adsorption), etc. The adsorbents and / or oxidation catalysts used are conventional reagents or reagents prepared by conventional methods. The sulfur-containing coal gas is treated by a two-stage desulfurization device arranged in series, so that the sulfur concentration of the blast furnace gas entering the gas network after desulfurization is less than 0.1 mg / m 3 .

[0029] Furthermore, in order to ensure integrated desulfurization of blast furnace gas, an integrated desulfurization device for blast furnace gas is designed, which includes an air intake section, a catalytic section, an enhancement section, a desulfurization section and an air outlet section connected in sequence; the enhancement section includes a stirring device and an inner wall with a concave-convex structure; the concave-convex structure is based on a plane and consists of continuous alternating depressions and protrusions, the maximum vertical height of the protrusion is 10-15mm, and the maximum vertical depth of the depression is 3-5mm; the height of the catalytic section is less than the height of the desulfurization section.

[0030] The configuration of the catalytic section, the strengthening section, and the desulfurization section can be a continuous vertical configuration, that is, the air intake section, the catalytic section, the strengthening section, the desulfurization section, and the air outlet section can be configured from bottom to top, or the air intake section, the catalytic section, the strengthening section, the desulfurization section, and the air outlet section can be configured from top to bottom. Or a U-shaped configuration, that is, the bottom of the U-shaped is sequentially configured as the catalytic section, the strengthening section, and the desulfurization section, or the bottom of the U-shaped is divided into two parts, one part is configured as the catalytic section and the desulfurization section that are not connected to each other, and then the other part of the U-shaped is configured as the strengthening section to connect the catalytic section and the desulfurization section, and the two openings of the U-shaped are respectively configured as the air intake section and the air outlet section, or other shapes.

[0031] In the face of huge blast furnace gas generation, the current blast furnace gas purification device still has the disadvantages of large scale, large floor space and complex operation. In order to solve the existing technical problems, such as Figure 1-Figure 2 As shown, a compact modular blast furnace gas purification device layout method is provided in this embodiment, including a modular device body, which is divided into a modular hydrolysis device 1, a modular adsorption device 6 independent tower body according to different functions, and an air inlet, an air outlet, a feed port, a discharge port and an inlet and outlet nitrogen sealing valve arranged on the modular device body.

[0032] like Figure 3-Figure 4 As shown, the modules are stacked up and down to form a module group, which shares the inlet and exhaust gas channels, the upper feeding and lower discharging devices. In actual applications, the module group also includes an online module group and an offline module group.

[0033] As a specific implementation of this embodiment, the main body of the modular device adopts the form of a radial flow reactor, and the device is a cylindrical structure. According to different reaction conditions, the hydrolysis device is designed as a pressure vessel, and its main function is to convert organic sulfur into inorganic sulfur. The adsorption device is a common reactor, and its main function is to adsorb and remove inorganic sulfur. The hydrolysis catalyst can be a rod-shaped or spherical activated carbon + alumina hydrolysis catalyst, and the adsorbent can be a rod-shaped iron oxide or zinc oxide adsorbent. The main body of the modular device has a diameter of about 2.5 to 5.5m, and the height of the box is reasonably distributed within the range of 4.5 to 9.5m, so that the main body of the modular device is neither too large and too heavy, nor too small and too light, so as to facilitate the manufacture, transportation and hoisting of the modular device. The main body material of the modular device adopts the structural form of "carbon steel + external insulation", and the carbon steel is Q345 carbon steel with a thickness of 4 to 6mm. A rock wool / aluminum silicate fiber felt insulation layer with a thickness of 100 to 200mm is set outside the tower body.

[0034] Hydrolysis catalysts play a vital role in the blast furnace gas desulfurization process. They promote the reaction of organic sulfur compounds (such as carbon monoxide sulfur COS) with water to produce inorganic sulfur (hydrogen sulfide H2S). Rod-shaped hydrolysis catalysts have high reaction efficiency due to their large specific surface area and good gas flow and heat transfer characteristics. They are usually composed of a variety of metal oxides such as titanium, zirconium, vanadium, etc. These metal oxides not only have good catalytic activity and thermal stability, but also have good wear resistance and impact resistance, which enables rod-shaped catalysts to be used for a long time in blast furnace gas purification devices. They usually have good regeneration ability and can restore their catalytic performance through the regeneration process after the activity decreases. On the other hand, activated carbon + alumina hydrolysis catalysts are favored due to their high specific surface area and chemical stability. The porous structure of activated carbon provides a large number of active sites, which improves the catalytic efficiency, while alumina, as a carrier, enhances the structural strength of the catalyst and provides good chemical stability and thermal stability. The pore structure of this catalyst can be customized according to specific reaction conditions and requirements to improve the adsorption capacity of target sulfur compounds. At the same time, the combination of activated carbon and alumina provides stronger alkaline sites, which is particularly important for promoting hydrolysis reactions. In addition, the activated carbon + alumina hydrolysis catalyst also has good regeneration characteristics. Its activity can be restored by thermal regeneration or chemical regeneration to achieve multiple cycles. When selecting a catalyst, it is necessary to consider specific process requirements, operating conditions (such as temperature, pressure) and economics to ensure the efficiency and economy of the blast furnace gas purification process.

[0035] The blast furnace gas is first hydrolyzed into H2S by a hydrolysis device, and then the H2S is removed uniformly by an adsorption device to complete the purification.

[0036] Every two modules are stacked up and down to form a module group, which is connected in parallel in the gas pipeline. The upper and lower modules share the main gas inlet and exhaust ducts, supporting steel structures, gas duct brackets, and charging and discharging channels. The connection between the upper and lower steel structures is connected by elastic supports to cope with changes in thermal expansion and contraction during maintenance.

[0037] According to the actual blast furnace gas volume, several module groups can be selected. Each module is equipped with an independent gas cut-off valve and activated carbon cut-off valve. If any module has a problem, it can be isolated from the system without affecting the overall performance.

[0038] The hydrolysis device and the adsorption device are fixed bed reactors, and the fresh material bin and the unloading bin and their associated channels are used when replacing the hydrolysis catalyst and the adsorbent.

[0039] The present invention proposes a method for arranging a compact modular blast furnace gas purification device. The system is flexible in operation, has a small footprint, good spatial adaptability, a high operating rate, and a high gas purification efficiency. It is very suitable for upgrading and renovating purification devices of existing blast furnaces. Compared with devices using a planar layout, the system reduces the footprint by 50% and the amount of steel structure by 50%, which can significantly reduce the investment cost of the project and has considerable economic benefits.

[0040] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A compact modular blast furnace gas purification device layout method, characterized in that: The following steps are involved: Based on the blast furnace gas purification process, the blast furnace gas purification device is divided into a modular hydrolysis device (1) and a modular adsorption device (6); A plurality of the modular hydrolysis devices (1) and a plurality of the modular adsorption devices (6) are stacked up and down to obtain a plurality of module groups; A plurality of the module groups are connected in parallel to a gas pipeline to obtain a modular blast furnace gas purification device.

2. The method for arranging a compact modular blast furnace gas purification device according to claim 1, characterized in that: The modular blast furnace gas purification device adopts the form of a radial flow reactor.

3. The method for arranging a compact modular blast furnace gas purification device according to claim 1, characterized in that: The main body material of the modular blast furnace gas purification device adopts the structure of carbon steel + external insulation; Among them, the thickness of the carbon steel is Q345 carbon steel with a specification of 4 to 6 mm, and the external insulation is a rock wool and aluminum silicate fiber felt insulation layer with a thickness of 100 to 200 mm.

4. The method for arranging a compact modular blast furnace gas purification device according to claim 1, characterized in that: The modular blast furnace gas purification device has a diameter of 2.5 to 5.5 meters and a box height of 4.5 to 9.5 meters.

5. The method for arranging a compact modular blast furnace gas purification device according to claim 1, characterized in that: The process of designing a modular blast furnace gas purification unit includes: Several of the module groups share the main gas inlet and exhaust ducts, supporting steel structures, gas duct brackets, and charging and discharging channels.

6. The method for arranging a compact modular blast furnace gas purification device according to claim 5, characterized in that: Any of the modular hydrolysis devices (1) and modular adsorption devices (6) are provided with independent gas shut-off valves and activated carbon shut-off valves.

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