Method for reducing resistance of packing in dry desulfurization of blast furnace gas

Abstract

This invention discloses a method for reducing packing resistance in dry desulfurization of blast furnace gas, relating to the field of blast furnace gas desulfurization technology. The invention includes setting an upper baffle and a lower baffle at the upper and lower ends of the packing layer within the desulfurization tower body, and fixing a support frame at the lower and upper ends of the lower baffle. The portion of the support frame located at the upper end of the lower baffle divides the packing layer into two parts. Each part is detachably equipped with an upper inclined plate and a lower inclined plate, dividing the packing layer into upper, middle, and lower chambers. A spare baffle is set above the upper baffle to form a spare compartment. During normal operation, less packing than the original desulfurization dosage in the desulfurization tower packing layer is distributed into each chamber to disperse pressure, and the spare compartment operates empty. When the gas composition changes or the desulfurization accuracy requirement increases, desulfurizing agent packing is added to the spare compartment to improve the desulfurization rate. This invention effectively reduces the caking phenomenon of desulfurizing agent packing after ballast loading, which is beneficial for reducing gas resistance and pressure drop.

Description

Technical Field

[0001] This invention relates to the field of blast furnace gas desulfurization technology, specifically a method for reducing packing resistance in dry blast furnace gas desulfurization. Background Technology

[0002] Methods for fine desulfurization of blast furnace gas at the source mainly include two categories: dry desulfurization and wet desulfurization. Dry desulfurization towers are further divided into vertical and horizontal towers. In horizontal dry desulfurization towers for blast furnace gas, the packing layer is filled with desulfurizing agent. After a certain period of system operation, the desulfurizing agent needs to be replaced. However, under normal circumstances, after long-term operation, the lower part of the desulfurizing agent tends to caking, increasing the packing resistance. This is extremely detrimental to the relatively low pressure of blast furnace gas. Furthermore, caking also makes packing replacement more difficult.

[0003] The invention patent with publication number CN214075945U, entitled "Desulfurization Tower and Its Anti-caking Device," discloses a method of setting a portion of the outer wall of the tower as an elastic deformable plate and using a rapping method to crack the caking. Although the effect is expected to achieve the goal of clearing the caking, the device requires a redesign of the outer wall of the tower, and its load-bearing capacity, sealing performance, and durability are all difficult problems to overcome. There are also caking-related solutions in other fields. For example, the invention patent with publication number CN210259640U, entitled "A Limestone Powder Silo for Flue Gas Desulfurization That Is Not Easily Caking," discloses a technical solution of setting a stirring device and a spring-shaped stirring rod at the bottom. Although it can also reduce caking through continuous stirring, this approach is not only energy-intensive, but also has the problems of cumbersome maintenance and difficulty in being applied to dry horizontal desulfurization towers for blast furnace gas. Summary of the Invention

[0004] The purpose of this invention is to provide a method for reducing packing resistance in dry desulfurization of blast furnace gas, so as to solve the problem that the lower part of the desulfurizing agent packing in the dry horizontal desulfurization tower of blast furnace gas is prone to caking and increasing resistance.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for reducing packing resistance in dry desulfurization of blast furnace gas, comprising the following specific contents:

[0006] Upper baffles and lower baffles are respectively installed at the upper and lower ends of the packing layer inside the desulfurization tower. Support frames are fixedly installed at the lower and upper ends of the lower baffles. The part located at the lower end of the lower baffles supports the packing layer in the middle of the tower body, and the part located at the upper end of the lower baffles is set in the middle of the lower baffles to support the upper baffles.

[0007] The support frame, located at the upper part of the lower partition, divides the packing layer into two parts. Each part is detachably equipped with an upper inclined plate and a lower inclined plate. The two inclined plates divide the packing layer of their respective parts into three chambers: upper, middle, and lower. A spare partition is set above the upper partition, and the space between the two forms a spare compartment. Spare manholes are opened at one or both ends of the tower body. During normal operation, less packing than the original desulfurization packing layer is distributed into each chamber to disperse the pressure. The spare compartment operates empty. When the gas composition changes or the desulfurization accuracy requirement increases, desulfurizing agent packing is added to the spare compartment to improve the desulfurization rate.

[0008] The upper partition, lower partition, spare partition, upper inclined plate, and lower inclined plate all use detachable and fixedly installed perforated plates.

[0009] Preferably, unloading holes for the upper inclined plate and the lower inclined plate are respectively provided in the lower part of the upper inclined plate and the lower inclined plate for unloading.

[0010] Preferably, the upper inclined plate discharge hole and the lower inclined plate discharge hole are respectively equipped with cover plates. When the packing is unloaded, a portion of the packing is first released through the manhole located at the packing layer of the desulfurization tower body. Then, the cover plate of the lower inclined plate discharge hole is opened, and another portion of the packing is released. Then, the cover plate of the upper inclined plate discharge hole is opened. After the packing can no longer be released, each screen plate is disassembled to completely unload the packing.

[0011] Preferably, the upper end of the upper inclined plate is detachably fixed to the middle part of the upper partition plate by bolts, the lower end of the upper inclined plate and the upper end of the lower inclined plate are respectively detachably fixed to the inner wall of the tower body located in the middle of the packing layer by bolts, and the lower end of the lower inclined plate is detachably fixed to the middle part of the lower partition plate by bolts.

[0012] Preferably, the tower body has at least two manholes, which are respectively opened on both sides of the tower body for unloading, and the manholes are located between the lower inclined plate and the lower partition plate, and are inclined downward.

[0013] Preferably, two loading holes are opened at the top of the tower body, located above the two parts of the packing layer divided by the support frame.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The method for reducing packing resistance in dry desulfurization of blast furnace gas involves dividing the packing layer into three chambers (upper, middle, and lower) using upper and lower inclined plates. This reduces the amount of packing in each chamber and disperses the pressure, effectively reducing the caking of desulfurizing agent packing after ballast loading, which helps to reduce gas resistance and pressure drop.

[0016] 2. The method for reducing packing resistance in dry desulfurization of blast furnace gas, by adding a spare compartment, allows the spare compartment to operate empty when not requiring excessive packing. Under special circumstances, such as when the gas composition changes or the desulfurization accuracy requirement increases, desulfurizing agent can be added to further improve the desulfurization rate. This helps reduce the total amount of packing in the packing layer when not requiring excessive packing, and helps reduce gas resistance and pressure drop.

[0017] 3. This method of dry desulfurization of blast furnace gas to reduce packing resistance is applicable to situations where blast furnace gas has a large flow rate, low pressure, and complex composition. In addition, it can be specially equipped with a discharge hole and a manhole in a special position to facilitate the loading and unloading of desulfurizing agent packing. It is easy to use and operate, and can be simply improved in the original packing loading and unloading operation without the need to formulate a completely new loading and unloading operation plan, which is easy to implement. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the present invention after the filler is installed.

[0020] In the diagram: 1. Tower body; 2. Inlet pipe; 3. Outlet pipe; 4. Upper baffle; 5. Lower baffle; 6. Upper inclined plate; 7. Upper inclined plate discharge hole; 8. Lower inclined plate; 9. Lower inclined plate discharge hole; 10. Support frame; 11. Manhole; 12. Loading hole; 13. Spare compartment; 14. Spare manhole. Detailed Implementation

[0021] A method for reducing packing resistance in dry desulfurization of blast furnace gas includes the following specific details:

[0022] See Figure 1 and Figure 2 An upper baffle 4 and a lower baffle 5 are respectively installed at the upper and lower ends of the packing layer inside the desulfurization tower body 1. A support frame 10 is fixedly installed at the lower and upper ends of the lower baffle 5. The part located at the lower end of the lower baffle 5 supports the packing layer in the middle of the tower body 1, and the part located at the upper end of the lower baffle 5 is set in the middle of the lower baffle 5 to support the upper baffle 4.

[0023] The support frame 10, located above the lower partition 5, divides the packing layer into two parts. Each part is detachably equipped with an upper inclined plate 6 and a lower inclined plate 8. The two inclined plates divide the packing layer of their respective parts into three chambers: upper, middle, and lower. A spare partition is set above the upper partition 4, and the space between the two forms a spare compartment 13. Spare manholes 14 are opened at one or both ends of the tower body 1. During normal operation, less desulfurization packing than the original desulfurization tower packing layer is distributed into each chamber to disperse the pressure. The spare compartment 13 operates empty. When the gas composition changes or the desulfurization accuracy requirement increases, desulfurization packing is added to the spare compartment 13 to improve the desulfurization rate.

[0024] The upper partition 4, lower partition 5, spare partition, upper inclined plate 6 and lower inclined plate 8 are all detachable and fixedly installed perforated plates.

[0025] Because the original packing layer of the dry horizontal desulfurization tower for blast furnace gas has all the pressure on the bottom of the packing, it is easier for the bottom to compact and caking. After the above-mentioned improvement, the packing layer is divided into a total of 6 chambers, and the amount of packing in each chamber is reduced accordingly. The pressure is also dispersed, which can effectively reduce the phenomenon of desulfurizing agent packing caking after ballast. In addition, due to the addition of the spare compartment 13, the spare compartment 13 can be run empty when there is no need for too much packing. When the gas composition changes or the desulfurization accuracy requirement increases, the desulfurizing agent packing can be added to further improve the desulfurization rate. This is beneficial to reduce the total amount of packing in the above 6 chambers when there is no need for too much packing. Both of the above effects are beneficial to reducing gas resistance and pressure drop.

[0026] Under the above scheme, if the packing needs to be replaced, there is no specially set unloading structure during unloading. All the screen plates must be disassembled first, and then unloaded from the manholes provided at the packing layer of the desulfurization tower. The operation is relatively troublesome and there may be problems with disassembly. Therefore, the lower part of the upper inclined plate 6 and the lower inclined plate 8 can be further provided with upper inclined plate unloading hole 7 and lower inclined plate unloading hole 9 respectively to facilitate unloading. The upper inclined plate unloading hole 7 and the lower inclined plate unloading hole 9 can also be further provided with cover plates. When the tower body 1 is in the working state, the cover plates are closed, and when unloading, they are opened. This allows for better retention of the packing material within its designated chamber. Of course, the cover plate can be remotely controlled and electrically driven, or it can be opened and closed manually using a mechanical method. Almost any common form can be used. The specific form of the cover plate is quite common in various fields, so it will not be elaborated further. When unloading the packing material, first release a portion of the packing material through the manhole located at the packing layer in the desulfurization tower body 1, then open the cover plate of the lower inclined plate discharge hole 9, release another portion of the packing material, and then open the cover plate of the upper inclined plate discharge hole 7. After the packing material can no longer be released, disassembling each screen plate will reduce a lot of obstacles. After the screen plates are disassembled, the material can be completely unloaded.

[0027] like Figure 1As shown, in a preferred embodiment, the upper end of the upper inclined plate 6 is bolted to the middle of the upper partition plate 4, the lower end of the upper inclined plate 6 and the upper end of the lower inclined plate 8 are bolted to the inner wall of the tower body 1 at the middle of the packing layer, and the lower end of the lower inclined plate 8 is bolted to the middle of the lower partition plate 5. The bolted connection method is common, the connection is stable and easy to disassemble.

[0028] In the above preferred embodiment, the manholes that are typically installed in desulfurization towers can be relocated to a position more suitable for this tower body 1: e.g. Figure 1 As shown, the tower body 1 has at least two manholes 11 (because the desulfurization tower is horizontal, more manholes 11 can actually be opened along the length of the tower body), which are opened on both sides of the tower body 1 for unloading, and the manholes 11 are located between the lower inclined plate 8 and the lower partition plate 5, and are set inclined downward.

[0029] In addition, in conjunction with the above method, two loading holes 12 are provided on the upper part of the tower body 1, located above the two parts of the packing layer divided by the support frame 10. When reloading, it is generally necessary to first remove each screen plate (which is usually removed during unloading). For each chamber of packing, one screen plate is reinstalled. Other reloading work is the same as when the original desulfurization tower packing is replaced, and there is no need to form a new operation plan.

[0030] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

[0031] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A method for reducing packing resistance in dry desulfurization of blast furnace gas, characterized in that, Includes the following specific content: An upper baffle (4) and a lower baffle (5) are respectively installed at the upper and lower ends of the packing layer inside the desulfurization tower body (1). A support frame (10) is fixedly installed at the lower and upper ends of the lower baffle (5). The part located at the lower end of the lower baffle (5) supports the packing layer in the middle of the tower body (1), and the part located at the upper end of the lower baffle (5) is set in the middle of the lower baffle (5) to support the upper baffle (4). A manhole is opened on the outside of the packing layer in the tower body (1). The support frame (10) located at the upper part of the lower partition (5) divides the packing layer into two parts. Each part is detachably equipped with an upper inclined plate (6) and a lower inclined plate (8). The two inclined plates divide the packing layer of the part into three chambers: upper, middle and lower. A spare partition is set above the upper partition (4), and the space between the two forms a spare compartment (13). A spare manhole (14) is opened at one or both ends of the tower body (1). During normal operation, less than the desulfurization dose in the original desulfurization tower packing layer is distributed in each chamber to disperse the pressure. The spare compartment (13) operates empty. When the gas composition changes or the desulfurization accuracy requirement increases, desulfurizing agent packing is added to the spare compartment (13) to improve the desulfurization rate. The upper partition (4), lower partition (5), spare partition, upper inclined plate (6) and lower inclined plate (8) are all made of detachable and fixed screen plates.

2. The method for reducing packing resistance in dry desulfurization of blast furnace gas according to claim 1, characterized in that: The upper inclined plate (6) and the lower inclined plate (8) are respectively provided with upper inclined plate unloading hole (7) and lower inclined plate unloading hole (9) for unloading.

3. The method for reducing packing resistance in dry desulfurization of blast furnace gas according to claim 2, characterized in that: The upper inclined plate discharge hole (7) and the lower inclined plate discharge hole (9) are respectively equipped with cover plates. When the packing is unloaded, a portion of the packing is first released from the manhole located at the packing layer of the desulfurization tower body (1). Then, the cover plate of the lower inclined plate discharge hole (9) is opened, and another portion of the packing is released. Then, the cover plate of the upper inclined plate discharge hole (7) is opened. After the packing can no longer be released, each screen plate is disassembled to completely unload the packing.

4. A method for reducing packing resistance in dry desulfurization of blast furnace gas according to any one of claims 1 to 3, characterized in that: The upper end of the upper inclined plate (6) is detachably fixed to the middle part of the upper partition plate (4) by bolts. The lower end of the upper inclined plate (6) and the upper end of the lower inclined plate (8) are respectively detachably fixed to the inner wall of the tower body (1) at the middle part of the packing layer by bolts. The lower end of the lower inclined plate (8) is detachably fixed to the middle part of the lower partition plate (5) by bolts.

5. The method for reducing packing resistance in dry desulfurization of blast furnace gas according to claim 4, characterized in that: The tower body (1) has at least two manholes (11), which are respectively opened on both sides of the tower body (1) for unloading. The manholes (11) are located between the lower inclined plate (8) and the lower partition plate (5) and are inclined downward.

6. The method for reducing packing resistance in dry desulfurization of blast furnace gas according to claim 1, characterized in that: Two loading holes (12) are opened at the upper part of the tower body (1), located above the two parts of the packing layer divided by the support frame (10).

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