A compact modular blast furnace gas purification device arrangement method

Abstract

The application discloses a compact modular blast furnace gas purification device arrangement method, and belongs to the field of blast furnace gas desulfurization / purification. The method comprises the following steps: dividing a blast furnace gas purification device into modular hydrolysis devices and modular adsorption devices based on a blast furnace gas purification process; stacking the modular hydrolysis devices and the modular adsorption devices upwards and downwards to obtain a plurality of module groups; and connecting the module groups in parallel to a gas pipeline to obtain a modular blast furnace gas purification device. The blast furnace gas purification device designed by the application is flexible to operate, has a small floor area, is good in space adaptability, has a high operation rate, is high in gas purification efficiency, and is suitable for upgrading and reconstruction of a purification device of an existing blast furnace.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of blast furnace gas desulfurization / purification, and particularly relates to a compact modular blast furnace gas purification device arrangement method. BACKGROUND

[0002] The existing technology discloses that the adsorption modules are arranged in the desulfurization tower body from bottom to top, and the catalyst in the modules is used to purify the blast furnace gas. The existing technology blast furnace gas fine desulfurization system includes a dechlorination tower, a hydrolysis tower and a desulfurization tower, and the feature is that the reactors are sequentially connected to purify the blast furnace gas, and the design and arrangement of the overall system are not mentioned.

[0003] It is found that the existing technology still has the following problems when applied to practical applications: (1) The COS hydrolysis + dry desulfurization process is currently stable in operation, and there are more engineering cases, but there are generally problems of large occupied area and low operation rate. For example, the blast furnace gas generation amount of a 3000m 3 3 blast furnace is about 550,000Nm 3 / h, the loading amount of the catalyst and the adsorbent of the purification device is about several thousand cubic meters, the occupied area is huge, and the in-out material operation is complicated; (2) The blast furnace gas purification device is not perfect, and there is still a lot of room for improvement. Although the device is nominally designed as a module, it is actually an adjustment of the catalyst layer in a single tower, the internal flow field is complex, the pressure drop is large, and when facing a large-volume blast furnace gas generation amount, the purification device will inevitably be large in scale. Therefore, the present application proposes a compact modular blast furnace gas purification device arrangement method. SUMMARY

[0004] To solve the above technical problems, the present application proposes a compact modular blast furnace gas purification device arrangement method to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above-mentioned purpose, the present application provides a compact modular blast furnace gas purification device arrangement method, including the following steps:

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

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

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

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

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

[0011] The carbon steel has a thickness of Q345 carbon steel with a specification of 4-6 mm, and the external thermal insulation has a thickness of 100-200 mm of rock wool or aluminum silicate fiber insulation layer.

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

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

[0014] The plurality of module groups share the main gas inlet and outlet, the supporting steel structure, the gas channel support, the loading and discharging channel.

[0015] Optionally, the modular hydrolysis device (1) and the modular adsorption device (6) are each provided with independent gas shut-off valves and activated carbon shut-off valves.

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

[0017] The present application divides the blast furnace gas purification device into modular hydrolysis devices and adsorption devices, and uses the upper and lower stacking method to form module groups, and then connects these module groups in parallel to the gas pipeline, thereby constructing a compact modular blast furnace gas purification device. This design significantly improves the space utilization and operation efficiency, while reducing the land occupation and engineering investment cost. Due to the modular design, the operation of the device is more flexible, and the maintenance and upgrading are facilitated, and the failure of a single module will not affect the operation of the whole system, thereby improving the stability and reliability of the system. In addition, the compact design of the device reduces the amount of steel structure, reduces the impact on the environment, and improves the gas purification efficiency, which is of great significance to improve the technical level and economic benefits in the field of blast furnace gas desulfurization / purification. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and the illustrative embodiments of the present application and their description serve to explain the present application. The accompanying drawings do not constitute an inappropriate limitation on the present application. In the drawings:

[0019] Figure 1 The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and the illustrative embodiments of the present application and their description serve to explain the present application. The accompanying drawings do not constitute an inappropriate limitation on the present application. In the drawings:

[0020] Figure 2 The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and the illustrative embodiments of the present application and their description serve to explain the present application. The accompanying drawings do not constitute an inappropriate limitation on the present application. In the drawings:

[0021] Figure 3 The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and the illustrative embodiments of the present application and their description serve to explain the present application. The accompanying drawings do not constitute an inappropriate limitation on the present application. In the drawings:

[0022] Figure 4The figure shows the main flue gas inlet and exhaust of the module of the embodiment of the present application;

[0023] Legend: 1, modular hydrolysis device; 2, hydrolysis catalyst fresh bin; 3, hydrolysis catalyst discharge bin; 4, hydrolysis catalyst feeding channel; 5, hydrolysis catalyst discharge channel; 6, modular adsorption device; 7, adsorbent fresh bin; 8, adsorbent discharge bin; 9, adsorbent feeding channel; 10, adsorbent discharge channel. DETAILED DESCRIPTION

[0024] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. 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 flowchart of the accompanying drawings can be executed in a computer system such as a group of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in a different order.

[0026] Embodiment one

[0027] The method for catalytic hydrolysis fine desulfurization of blast furnace gas is that after the dust removal of blast furnace gas, the blast furnace gas is cooled to 50-150 degrees Celsius, and then is introduced into a gas-solid catalytic reactor, and under the condition that water vapor and catalyst exist simultaneously, the organic sulfur in the blast furnace gas is subjected to hydrolysis reaction, and the organic sulfur in the blast furnace gas is hydrolyzed and oxidized into inorganic sulfur, and after the reaction, the gas is subjected to inorganic sulfur removal by an inorganic sulfur removal device, and the blast furnace gas after desulfurization treatment is introduced into a gas pipe network for use.

[0028] The inorganic sulfur is hydrogen sulfide, sulfur dioxide, etc., and the inorganic sulfur removal method includes conventional methods such as wet desulfurization (oxidation method, chemical absorption method, physical absorption method and physical-chemical absorption method), dry desulfurization (catalytic oxidation method, adsorption method), etc., and the adsorbent and / or oxidation catalyst used are reagents prepared according to conventional reagents or conventional methods. The desulfurization device arranged in two stages in series is used for treating the sulfur-containing gas, so that the sulfur concentration of the blast furnace gas after desulfurization and entering the gas pipe network is less than 0.1 mg / m 3 .

[0029] Further, in order to ensure the integrated desulfurization of blast furnace gas, an integrated desulfurization device for blast furnace gas is designed, which comprises a gas inlet section, a catalytic section, a strengthening section, a desulfurization section and a gas outlet section which are sequentially connected; the strengthening section comprises a stirring device and an inner wall with a concave-convex structure; the concave-convex structure is composed of continuous and alternating concave and convex parts based on a plane, the maximum vertical height of the convex part is 10-15 mm, and the maximum vertical depth of the concave part is 3-5 mm; the height of the catalytic section is less than the height of the desulfurization section.

[0030] The catalytic converter, enhancement section, and desulfurization section can be configured in a continuous vertical arrangement, i.e., from bottom to top (inlet, catalytic converter, enhancement section, desulfurization section, and outlet), or from top to bottom (continuous vertical arrangement). Alternatively, a U-shaped configuration can be used, where the bottom of the U-shape is sequentially configured with the catalytic converter, enhancement section, and desulfurization section, or the bottom of the U-shape can be divided into two parts: one part for the non-connected catalytic converter and desulfurization section, and the other part for the enhancement section connecting the catalytic converter and desulfurization section. The two openings of the U-shape are configured as the inlet and outlet sections, respectively, or other shapes.

[0031] Faced with a huge volume of blast furnace gas production, current blast furnace gas purification devices still suffer from drawbacks such as large scale, large footprint, and complex operation. To solve these existing technical problems, such as... Figures 1-2 As shown, this embodiment provides a method for arranging a compact modular blast furnace gas purification device, including a modular device body. The modular device body is divided into a modular hydrolysis device 1 and a modular adsorption device 6 independent tower body according to different functions, as well as an air inlet, air outlet, feed inlet, discharge outlet and feed nitrogen sealing valves installed on the modular device body.

[0032] like Figures 3-4 As shown, the modules are stacked one on top of the other to form a module group, sharing the inlet and outlet gas ducts, upper feeding and lower discharging devices. In practical applications, the module group also includes online module groups and offline module groups.

[0033] As a specific implementation of this embodiment, the main body of the modular device adopts a radial flow reactor form, and the device has a cylindrical structure. Depending on the 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 conventional 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 diameter of the main body of the modular device is approximately 2.5 to 5.5 m, and the height of the box is reasonably distributed within the range of 4.5 to 9.5 m, so that the main body of the modular device is neither too large nor too heavy, nor too small nor too light, to facilitate the manufacturing, transportation and hoisting of the modular device. The main body material of the modular device adopts a "carbon steel + external insulation" structure. The carbon steel is Q345 carbon steel with a thickness of 4 to 6 mm, and a rock wool / alumina silicate fiber felt insulation layer with a thickness of 100 to 200 mm is set outside the tower body.

[0034] Hydrolysis catalysts play a crucial role in the desulfurization process of blast furnace gas, as they facilitate 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 typically composed of various metal oxides, such as titanium, zirconium, vanadium, and others, which not only have good catalytic activity and thermal stability but also exhibit good wear resistance and impact resistance. This allows the rod-shaped catalysts to be used for a long time in blast furnace gas purification devices, and they generally have good regeneration capabilities, enabling them to restore their catalytic performance after activity decreases through a regeneration process. 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, improving catalytic efficiency, while alumina as a carrier enhances the structural strength of the catalyst and provides good chemical and thermal stability. The pore structure of this catalyst can be customized according to specific reaction conditions and requirements to improve the adsorption capacity for target sulfur compounds. Additionally, the combination of activated carbon and alumina provides stronger basic sites, which are particularly important for promoting hydrolysis reactions. Furthermore, activated carbon + alumina hydrolysis catalysts also have good regeneration properties, allowing them to restore their activity through thermal or chemical regeneration, enabling multiple cycles of use. When selecting a catalyst, specific process requirements, operating conditions (such as temperature and pressure), and economic considerations should be taken into account to ensure the efficiency and economy of the blast furnace gas purification process.

[0035] Blast furnace gas is first hydrolyzed to H2S by the hydrolysis device, and then H2S is removed by the adsorption device, completing purification.

[0036] Each two modules are stacked vertically to form a module group, and the module group is connected in parallel to the gas pipeline. The upper and lower modules share the main gas inlet and outlet, support steel structure, gas duct support, loading and unloading channels. The connection between the upper steel structure and the lower steel structure is connected by elastic support to cope with the changes of thermal expansion and contraction during maintenance.

[0037] According to the actual blast furnace gas quantity, several module groups can be selected, and each module is provided with independent gas shut-off valves and activated carbon shut-off valves. If any module has a problem, it can be isolated from the system individually 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 auxiliary channels are used for replacing hydrolysis catalysts and adsorbents.

[0039] The application provides a compact modular blast furnace gas purification device arrangement method, which is flexible in operation, small in land occupation, good in space adaptability, high in operation rate, high in gas purification efficiency, very suitable for upgrading and reconstruction of the purification device of the built blast furnace, 50% less in land occupation and 50% less in steel structure consumption compared with the device using plane arrangement, can significantly reduce the investment cost of the project, and has considerable economic benefits.

[0040] The above is only a preferred specific embodiment of the application, but the protection scope of the application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the application, which should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A compact modular blast furnace gas cleaning device arrangement method, characterized by, The method comprises the following steps: The blast furnace gas purification device is divided into a modular hydrolysis device (1) and a modular adsorption device (6) based on a blast furnace gas purification process; A plurality of the modular hydrolysis devices (1) and a plurality of the modular adsorption devices (6) are stacked 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; The device comprises a gas inlet section, a catalytic section, a strengthening section, a desulfurization section and a gas outlet section connected in sequence; the strengthening section comprises a stirring device and an inner wall with a concave-convex structure; the catalytic section, the strengthening section and the desulfurization section are configured in a continuous vertical configuration or a U-shaped configuration; The modular blast furnace gas purification device adopts a radial flow reactor form; The body material of the modular blast furnace gas purification device adopts a carbon steel + external insulation structure form; The carbon steel has a thickness of 4-6 mm Q345 carbon steel, and the external insulation is a rock wool or aluminum silicate fiber felt insulation layer with a thickness of 100-200 mm; The diameter of the modular blast furnace gas purification device is 2.5-5.5 meters, and the height of the box body is 4.5-9.5 meters; The process of designing the modular blast furnace gas purification device comprises: A plurality of the module groups share a main gas inlet and outlet channel, a supporting steel structure, a gas channel support, a loading and unloading channel; Any of the modular hydrolysis devices (1) and the modular adsorption devices (6) is provided with independent gas shut-off valves and activated carbon shut-off valves.

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