A blast furnace gas desulfurization system with offline material replacement

Abstract

This utility model discloses an offline material replacement blast furnace gas desulfurization system, comprising a dechlorination purification unit, a hydrolysis purification unit, and a desulfurization purification unit arranged in series along the gas flow direction. The key feature is that each purification unit has at least one fixed packing purification area within its outer shell. Within this area, horizontally arranged flow-around baffles are further provided, arranged in three alternating rows along the horizontal direction and uniformly along the vertical direction. The flow-around baffles on the left and right sides and the middle flow-around baffle are staggered vertically. This utility model is a blast furnace gas desulfurization system based on a fixed packing bed structure, capable of adaptive adjustments according to different stages of the packing's service life to improve purification efficiency and packing utilization efficiency. It is particularly suitable for the production needs of small enterprises with low throughput requirements.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace gas purification and treatment technology, and in particular to a blast furnace gas fine desulfurization system with offline material replacement. Background Technology

[0002] Blast furnace gas is a combustible gas produced as a byproduct of blast furnace ironmaking. Its approximate composition includes 6-22% carbon dioxide, 21-26% carbon monoxide, 1-4% hydrogen, 53-57% safe gases, 0.2-0.5% hydrocarbons, and trace amounts of sulfur-containing substances. It is a low-calorific-value gaseous fuel, commonly used in the metallurgical industry for heating hot-rolled steel ingots and preheating molten steel ladles, and has significant applications.

[0003] Blast furnace gas has a complex composition. If it is burned as fuel without treatment, the resulting flue gas will contain a large number of harmful components and must be treated before being released. Currently, the popular approach to blast furnace gas treatment is to pre-treatment, that is, to desulfurize and purify the gas before combustion to remove its harmful components. After purification, the gas can be used as fuel in any way and is easier to control.

[0004] Centralized purification of blast furnace gas typically requires a fine desulfurization process. This involves first removing hydrogen chloride from the gas to avoid interfering with subsequent hydrolysis reactions, then hydrolyzing carbonyl sulfide in the gas to convert it into easily treatable hydrogen sulfide gas, and finally removing harmful components, primarily hydrogen sulfide, using absorption or adsorption methods.

[0005] To improve the purification efficiency of blast furnace gas, the applicant previously applied for patent CN202421376388.0, which disclosed a mobile blast furnace gas desulfurization equipment and a fine desulfurization system. This patented technology enables dynamic, mobile processing of the packing material, resulting in high desulfurization efficiency. However, this dynamic packing material processing method is costly and complex to control. Therefore, traditional purification equipment with a fixed packing bed structure still has a place in the market due to its simpler equipment and control, and more convenient and cost-effective implementation.

[0006] Traditional fixed-bed filter presses use horizontally stacked packing material on filter plates, allowing the gas to pass through them for purification. This results in a short gas flow path and low purification efficiency. Furthermore, the purification efficiency varies throughout the packing's lifespan, without corresponding control over gas flow. Consequently, the packing exhibits high purification efficiency in its early stages and low efficiency in its later stages. Improving overall purification efficiency requires premature packing replacement, leading to low packing utilization and significant waste. Utility Model Content

[0007] To address the shortcomings of the existing technology, the technical problem this invention aims to solve is: how to provide an offline material replacement desulfurization system for blast furnace gas based on a fixed packed bed structure, enabling adaptive adjustments according to different stages of the packed bed's service life to improve purification efficiency and packed bed utilization efficiency. This is particularly suitable for the production needs of small enterprises with low throughput requirements.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A blast furnace gas desulfurization system with offline material replacement includes a dechlorination purification unit, a hydrolysis purification unit, and a desulfurization purification unit arranged in series along the gas flow direction. Each purification unit includes a vertically arranged outer shell with a gas inlet at the lower end and a gas outlet at the upper end, forming an upward-flowing gas flow channel within the shell. At least one fixed-packing purification area is provided within the shell, comprising a horizontally arranged air-passing baffle within the shell cavity. The baffle has air-passing holes with a diameter smaller than the packing material, and purification packing material is correspondingly stacked on the baffle to form a fixed packing bed. The purification packing of the dechlorination purification unit is a dechlorination filtration purification packing, the purification packing of the hydrolysis purification unit is a hydrolysis filtration purification packing, and the purification packing of the dechlorination purification unit is a dechlorination filtration purification packing. The upper and lower ends of the outer shell sidewall above each air baffle are respectively provided with a new material inlet and a waste material outlet, and a sealing end cap is provided on the new material inlet and the waste material outlet respectively. In the fixed packing purification area above each air baffle, there are also horizontally arranged flow baffles. The flow baffles are arranged horizontally in three rows evenly arranged vertically, and the flow baffles on the left and right sides and the flow baffle in the middle are staggered and spaced apart.

[0010] In this way, the blast furnace gas sequentially passes through the dechlorination purification unit, the hydrolysis purification unit, and the desulfurization purification unit, completing the adsorption purification treatment of dechlorination, hydrolysis, and desulfurization. The equipment adopts a fixed packed bed method, which is simple in structure, low in cost, and easy to implement. At the same time, three rows of staggered flow-around baffles are set in the packed bed, so that when the blast furnace gas passes through the fixed packed bed in each unit, it can be blocked by the flow-around baffles to form a tortuous upward flow, which better increases the gas travel path, prolongs the contact time, and improves the purification effect.

[0011] Furthermore, the horizontal projections of the edges of two adjacent rows of flow-around baffles in the vertical direction overlap. This further increases the gas travel path and improves the purification effect.

[0012] Furthermore, the two rows of flow-around baffles on the left and right sides are arranged symmetrically, and the flow-around baffle in the middle row is located in the center between the flow-around baffles on the left and right sides.

[0013] This can better improve the uniformity of the gas travel path on both sides and ensure the uniformity of packing deactivation.

[0014] Furthermore, each of the flow-around baffles on the left and right sides has a rotating shaft in the middle and is rotatably mounted on the outer casing. One end of the rotating shaft extends out of the outer wall and is connected to the corresponding control motor.

[0015] In this way, the angle of the two rows of flow-around baffles on the left and right sides can be changed, and the gap between the middle flow-around baffle can be adjusted to regulate the gas flow rate. When new packing is added, the flow-around baffles are adjusted to be in a horizontal state to give them a larger gas flow rate. When the packing gradually deactivates, the edges of the flow-around baffles on both sides are adjusted to gradually move closer to the edge of the middle flow-around baffle to reduce the gas flow gap, reduce the gas flow rate, and prolong the time that the flue gas passes through the packing, so as to better ensure the purification efficiency of the flue gas and improve the utilization efficiency of the packing.

[0016] Furthermore, each purification unit is equipped with a harmful gas concentration detection sensor in its upper inner cavity. This sensor is connected to the control center, which in turn is connected to each control motor. This allows for automatic detection of harmful gas concentrations to determine the degree of packing deactivation and corresponding automatic adjustments.

[0017] Furthermore, each of the flow baffles in the middle row is provided with a rotating shaft in the middle and is rotatably mounted on the outer casing. One end of the rotating shaft extends out of the outer wall and is connected to the corresponding control motor.

[0018] This allows the flow-around baffles in the middle row to be rotated, making it easier to load and unload the purification packing.

[0019] Furthermore, the outer casing has a circular cross-section, and the adjacent edges of the flow-around baffle and the outer casing are matched with arc shapes. This better ensures the control effect.

[0020] Furthermore, each purification unit has multiple fixed packing purification zones arranged vertically inside its outer shell. These multiple zones can better improve the purification effect. At the same time, the packing material in the previous zone within each purification unit can be gradually moved to the next zone after the machine is stopped to replace the packing material. New packing material is only added to the topmost zone, and the packing material is manually circulated to improve the utilization rate of the packing material.

[0021] Alternatively, all purification units can be housed within a vertically oriented outer casing. This simplifies the overall structure.

[0022] Alternatively, each purification unit has its own vertically arranged outer casing with independent gas inlet and outlet. The gas outlet of the previous purification unit is connected to the gas inlet of the next purification unit via a series pipe. This reduces the overall height of the equipment and facilitates the loading of packing materials.

[0023] This utility model has the following advantages: 1. It significantly improves the utilization efficiency of materials (originally: less than 50% → now: 95%+); 2. It improves the desulfurization efficiency of blast furnace gas per unit area (originally: the highest blast furnace gas purification rate of a single tower was 80,000 m3 / h → now: the highest blast furnace gas purification rate of a single tower is 150,000 m3 / h).

[0024] In summary, this utility model is a blast furnace gas desulfurization system based on a fixed packed bed structure. It can be adaptively adjusted according to different stages of the packing's service life to improve purification efficiency and packing utilization efficiency. It is particularly suitable for the production needs of small enterprises with low throughput requirements. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the offline material replacement blast furnace gas desulfurization system according to the first embodiment of this utility model.

[0026] Figure 2 for Figure 1 A top view of the flow-passing baffles on the left and right sides of the center and their corresponding control motors.

[0027] Figure 3 for Figure 1 A top view of the flow-through baffles in the middle row and their corresponding control motors.

[0028] Figure 4 This is a schematic diagram of the offline material replacement blast furnace gas desulfurization system according to the second embodiment of this utility model. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to specific embodiments.

[0030] First embodiment: See Figure 1-3A blast furnace gas desulfurization system with offline material replacement includes a dechlorination purification unit 1, a hydrolysis purification unit 2, and a desulfurization purification unit 3 arranged in series along the gas flow direction. The system is characterized in that each purification unit includes a vertically arranged outer shell 4, with a gas inlet 5 at the lower end and a gas outlet 6 at the upper end, forming an upward-flowing gas flow channel within the shell. At least one fixed packing purification area is provided within the shell, comprising a horizontally arranged air-passing baffle 7 within the shell cavity. The air-passing baffle 7 has air-passing holes with a diameter smaller than the packing material distributed on it, and purification packing material is correspondingly stacked on the air-passing baffle 7 to form a fixed packing purification area. The packing bed, the purification packing of the dechlorination purification unit is a dechlorination filtration purification packing, the purification packing of the hydrolysis purification unit is a hydrolysis filtration purification packing, the purification packing of the dechlorination purification unit is a dechlorination filtration purification packing, the upper and lower ends of the outer shell sidewall above each air baffle are respectively provided with a new material inlet 8 and a waste material outlet 9, and a sealing end cap is provided on the new material inlet and the waste material outlet respectively; in the fixed packing purification area above each air baffle 7, there is also a horizontally arranged flow baffle 10, the flow baffle is arranged in three rows evenly arranged vertically along the horizontal, and the flow baffles on the left and right sides and the flow baffle in the middle are staggered and spaced apart.

[0031] In this way, the blast furnace gas sequentially passes through the dechlorination purification unit, the hydrolysis purification unit, and the desulfurization purification unit, completing the adsorption purification treatment of dechlorination, hydrolysis, and desulfurization. The equipment adopts a fixed packed bed method, which is simple in structure, low in cost, and easy to implement. At the same time, three rows of staggered flow-around baffles are set in the packed bed, so that when the blast furnace gas passes through the fixed packed bed in each unit, it can be blocked by the flow-around baffles to form a tortuous upward flow, which better increases the gas travel path, prolongs the contact time, and improves the purification effect.

[0032] In this design, the horizontal projections of the edges of two adjacent rows of flow-around baffles 10 in the vertical direction overlap. This increases the gas travel path and improves the purification effect.

[0033] Among them, the two rows of flow-around baffles 10 on the left and right sides are arranged symmetrically, and the flow-around baffle in the middle row is located in the center between the flow-around baffles on the left and right sides.

[0034] This can better improve the uniformity of the gas travel path on both sides and ensure the uniformity of packing deactivation.

[0035] Each of the flow-passing baffles on the left and right sides has a rotating shaft in the middle and is rotatably mounted on the outer casing. One end of the rotating shaft extends out of the outer wall and is connected to the corresponding control motor 11.

[0036] In this way, the angle of the two rows of flow-around baffles on the left and right sides can be changed, and the gap between the middle flow-around baffle can be adjusted to regulate the gas flow rate. When new packing is added, the flow-around baffles are adjusted to be in a horizontal state to give them a larger gas flow rate. When the packing gradually deactivates, the edges of the flow-around baffles on both sides are adjusted to gradually move closer to the edge of the middle flow-around baffle to reduce the gas flow gap, reduce the gas flow rate, and prolong the time that the flue gas passes through the packing, so as to better ensure the purification efficiency of the flue gas and improve the utilization efficiency of the packing.

[0037] Each purification unit is equipped with a harmful gas concentration detection sensor 12 in its upper inner cavity. The sensor is connected to a control center (not shown in the figure), which in turn is connected to each control motor 11. This allows for automatic detection of harmful gas concentrations to determine the degree of packing deactivation and corresponding automatic adjustments.

[0038] Each of the flow baffles in the middle row has a rotating shaft in the middle and is rotatably mounted on the outer casing. One end of the rotating shaft extends out of the outer wall and is connected to the corresponding control motor.

[0039] This allows the flow-around baffles in the middle row to be rotated, making it easier to load and unload the purification packing.

[0040] The outer shell 4 has a circular cross-section, and the adjacent edges of the flow-around baffle and the outer shell are matched with arc shapes. This ensures better control performance.

[0041] Each purification unit has multiple fixed packing purification zones vertically arranged inside its outer shell. These multiple zones improve the purification effect, and the packing material in each purification unit can be gradually moved to the next zone after the machine is stopped to replace the packing material. New packing material is only added to the topmost zone, and the packing material is manually circulated to improve its utilization rate.

[0042] Each purification unit has its own vertically arranged outer shell with independent gas inlet and outlet. The gas outlet of the previous purification unit is connected to the gas inlet of the next purification unit via a series pipe 13. This reduces the overall height of the equipment and facilitates the loading of packing materials.

[0043] Second embodiment, see Figure 4 In this embodiment, each purification unit is housed within a vertically arranged outer casing. The cross-section of the casing is rectangular, and the flow-around baffle is a corresponding rectangle. The remaining structures in this embodiment are the same as in the first embodiment and will not be described in detail here.

Claims

1. A high-temperature off-line replacement material blast furnace gas fine desulfurization system comprising, in the order of gas flow direction, a dechlorination purification unit, a hydrolysis purification unit, and a desulfurization purification unit, characterized in that, Each purification unit includes a vertically arranged outer shell with a gas inlet at the lower end and a gas outlet at the upper end, forming an upward-flowing gas flow channel within the shell. At least one fixed-packing purification area is located within the shell. This area includes horizontally arranged air-passing baffles with pores smaller than the packing material distributed on the baffles. Purification packing material is stacked on the baffles to form a fixed packing bed. The purification packing material in the dechlorination purification unit is a dechlorination filtration purification packing material, the purification packing material in the hydrolysis purification unit is a hydrolysis filtration purification packing material, and the purification packing material in the dechlorination purification unit is a dechlorination filtration purification packing material. A fresh material inlet and a waste material outlet are respectively located at the upper and lower ends of the outer shell sidewall above each air-passing baffle, with corresponding sealing end caps on the inlet and outlet. Within the fixed-packing purification area above each air-passing baffle, horizontally arranged bypass baffles are also provided. These bypass baffles are arranged in three alternating rows along the horizontal direction, uniformly arranged vertically, with the left and right bypass baffles and the middle bypass baffle staggered vertically.

2. The blast furnace gas desulfurization system with offline material replacement as described in claim 1, characterized in that, The horizontal projections of the edges of two adjacent columns of flow-around baffles in the vertical direction have an overlapping portion.

3. The blast furnace gas desulfurization system with offline material replacement as described in claim 1, characterized in that, The two rows of flow-around baffles on the left and right sides are arranged symmetrically, and the flow-around baffle in the middle row is located in the center between the flow-around baffles on the left and right sides.

4. The blast furnace gas desulfurization system with offline material replacement as described in claim 1, characterized in that, Each flow baffle on the left and right sides has a rotating shaft in the middle and is rotatably mounted on the outer casing. One end of the rotating shaft extends out of the outer wall and is connected to the corresponding control motor.

5. The blast furnace gas desulfurization system with offline material replacement as described in claim 4, characterized in that, Each purification unit is equipped with a harmful gas concentration detection sensor in its upper inner cavity. The harmful gas concentration detection sensor is connected to the control center, and the control center is connected to each control motor.

6. The blast furnace gas desulfurization system with offline material replacement as described in claim 4, characterized in that, Each flow baffle in the middle row has a rotating shaft in the middle and is rotatably mounted on the outer casing. One end of the rotating shaft extends out of the outer wall and is connected to the corresponding control motor.

7. The blast furnace gas desulfurization system with offline material replacement as described in claim 1, characterized in that, The outer shell has a circular cross-section, and the adjacent edges of the flow-around baffle and the outer shell are matched arc shapes.

8. The blast furnace gas desulfurization system with offline material replacement as described in claim 1, characterized in that, Each purification unit has multiple fixed packing purification zones arranged vertically along the inner edge of its outer shell.

9. The blast furnace gas desulfurization system with offline material replacement as described in claim 1, characterized in that, All purification units are housed within a vertically oriented outer casing.

10. The blast furnace gas desulfurization system with offline material replacement as described in claim 1, characterized in that, Each purification unit has its own vertically arranged outer shell and independent gas inlet and gas outlet. The gas outlet of the previous purification unit is connected to the gas inlet of the next purification unit through a series pipe.

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