Smelting flue gas dust removal device

Abstract

The utility model discloses a smelting flue gas dust removal device, which relates to the technical field of flue gas dust removal and comprises a dust removal spray tower, a gas inlet pipe of the dust removal spray tower is connected with a pre-filtering component through a connecting pipeline, and the pre-filtering component consists of a shell structure, a waste heat recovery component and a large-particle filter screen plate. The four large-particle filter screen plates are symmetrically and fixedly installed on the inner walls of the upper side and the lower side of the shell structure, and the waste heat recovery assembly is fixedly inserted into the shell structure and composed of a heat exchange shell, a connecting shell and a connecting bent pipe. By arranging the pre-filtering assembly composed of the shell structure, the waste heat recovery assembly and the large-particle filtering net plate at the air inlet pipe of the dust removal spraying tower, the purpose of pre-filtering dust-containing high-temperature smelting flue gas can be achieved, then the follow-up working load of the dust removal spraying tower can be reduced, the scaling and blocking probability in the dust removal spraying tower is reduced, and the dust removal efficiency is improved. The shutdown cleaning frequency of the dust removal spray tower is reduced, and the working efficiency of the dust removal spray tower is improved.

Description

Technical Field

[0001] This utility model relates to the field of flue gas dust removal technology, and in particular to a dust removal device for smelting flue gas. Background Technology

[0002] During the smelting process, a large amount of high-temperature flue gas is generated, which not only contains high concentrations of dust but may also contain harmful components such as sulfur dioxide and heavy metal vapors. Direct emission of this untreated flue gas will severely pollute the atmosphere and may harm human health through the respiratory tract. Currently, wet dust collection devices such as spray towers are commonly used in industry to treat smelting flue gas. However, significant technical defects exist in actual operation: First, direct entry of high-dust-load flue gas into the spray tower causes rapid scaling and blockage of the tower's internal components, significantly reducing dust removal efficiency and forcing frequent system shutdowns for cleaning, severely impacting production continuity. Second, smelting flue gas typically has high-temperature characteristics; direct spray cooling without waste heat recovery results in a significant waste of high-quality thermal energy, failing to meet the requirements of modern industrial energy conservation and emission reduction. This situation, which affects both treatment efficiency and energy waste, highlights the inadequacy of existing technologies. Utility Model Content

[0003] The main objective of this invention is to provide a dust removal device for smelting flue gas, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A dust removal device for smelting flue gas includes a dust removal spray tower. A pre-filtration assembly is connected to the inlet pipe of the dust removal spray tower via a connecting pipe. The pre-filtration assembly consists of a shell structure, a waste heat recovery assembly, and large particle filter plates. Four large particle filter plates are symmetrically and fixedly installed on the inner walls of the upper and lower sides of the shell structure. The waste heat recovery assembly is fixedly inserted into the shell structure and consists of a heat exchange shell, a connecting shell, and connecting bends. Four heat exchange shells are arranged in an alternating vertical arrangement. Each heat exchange shell is fixedly connected to a large particle filter plate. Eight connecting shells are fixedly installed at both ends of the four heat exchange shells. Three connecting bends connect the four heat exchange shells in series.

[0006] The housing structure of the pre-filter assembly consists of a main housing and installation pipes, with two installation pipes fixedly installed at both ends of the main housing.

[0007] The main housing has eight symmetrical mounting slots on its two side walls, and the mounting slots penetrate the inner wall of the main housing both inside and out.

[0008] The connecting pipe is fixedly connected to the air inlet pipe of the dust removal spray tower and one of the installation pipes on the shell structure by bolts.

[0009] The four large particle filter plates are located above or below the mounting slots, respectively.

[0010] Each heat exchange shell on the waste heat recovery assembly is fixedly inserted into two mounting slots. The connecting shell and the connecting bend are both located outside the main shell. The connecting bend is fixedly connected to the connecting shells fixedly installed at both ends of the main shell. Two of the heat exchange shells are located at the lower end of the large particle filter plate, and the other two heat exchange shells are located at the upper end of the large particle filter plate.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] By installing a pre-filtration component consisting of a shell structure, a waste heat recovery assembly, and a large-particle filter plate at the inlet pipe of the dust removal spray tower, the dust-laden high-temperature smelting flue gas passes through the pre-filtration component. The heat exchange shells on the waste heat recovery assembly can block the dust-laden high-temperature smelting flue gas, causing large dust particles in the flue gas to fall due to gravity after impacting the heat exchange shells. The large-particle filter plate can further block large dust particles in the dust-laden high-temperature smelting flue gas, thus achieving the purpose of pre-filtration of the dust-laden high-temperature smelting flue gas. This reduces the workload of the subsequent dust removal spray tower, decreases the probability of scaling and clogging inside the dust removal spray tower, reduces the frequency of shutdown and cleaning of the dust removal spray tower, and improves the working efficiency of the dust removal spray tower. At the same time, water can be injected into the waste heat recovery assembly to exchange heat with the dust-laden high-temperature smelting flue gas, thereby recovering heat from the dust-laden high-temperature smelting flue gas and reducing heat waste. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the pre-filter assembly of this utility model;

[0015] Figure 3 This is a cross-sectional view of the shell structure of this utility model;

[0016] Figure 4 This is a schematic diagram showing the positional relationship between the shell structure and the large particle filter screen of this utility model.

[0017] Figure 5 This is a schematic diagram of the waste heat recovery component of this utility model.

[0018] In the diagram: 1. Dust removal spray tower; 2. Pre-filtration assembly; 3. Connecting pipe; 4. Shell structure; 5. Waste heat recovery assembly; 6. Large particle filter screen; 7. Main shell; 8. Installation pipe; 9. Installation slot; 10. Heat exchange shell; 11. Connecting shell; 12. Connecting bend. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, a smelting flue gas dust removal device includes a dust removal spray tower 1. A pre-filter assembly 2 is connected to the inlet pipe of the dust removal spray tower 1 via a connecting pipe 3. The pre-filter assembly 2 consists of a shell structure 4, a waste heat recovery assembly 5, and large particle filter plates 6. Four large particle filter plates 6 are symmetrically and fixedly installed on the inner walls of the upper and lower sides of the shell structure 4. The waste heat recovery assembly 5 is fixedly inserted into the shell structure 4 and consists of heat exchange shells 10, connecting shells 11, and connecting bends 12. Four heat exchange shells 10 are arranged in an alternating pattern, and each heat exchange shell 10 is fixedly connected to the large particle filter plates 6. Eight connecting shells 11 are fixedly installed at both ends of the four heat exchange shells 10. Three connecting bends 12 connect the four heat exchange shells 10 in series. Before startup, check whether the shell structure 4, waste heat recovery assembly 5, and large particle filter plates 6 of the pre-filter assembly 2 are securely installed and ensure the connecting pipes are securely connected. The inlet pipes of the dust removal spray tower 1 and the inlet pipe of the channel 3 are sealed without leakage. Circulating water or other heat exchange media are injected into the waste heat recovery component 5 to ensure that the heat exchange shell 10 is filled with media and free of air bubbles. The flue gas conveying equipment (such as an induced draft fan or a booster fan) is started to transport the dust-laden high-temperature smelting flue gas to the pre-filter component 2. During operation, the high-temperature flue gas first enters the pre-filter component 2 and passes through the staggered heat exchange shell 10 and large particle filter plate 6 in the shell structure 4. The large dust particles in the flue gas settle due to inertial impact on the heat exchange shell 10 or obstruction by the large particle filter plate 6. The purified flue gas enters the dust removal spray tower 1 for further treatment through the connecting pipe 3. The waste heat recovery component 5 exchanges heat with the high-temperature flue gas through the heat exchange shell 10. The recovered heat can be used to preheat the boiler feed water or other process requirements. The dust accumulated on the large particle filter plate 6 is cleaned regularly, and the scaling condition of the heat exchange shell 10 is checked. If necessary, flushing or chemical cleaning is performed.

[0021] Specifically, the shell structure 4 on the pre-filtration component 2 consists of a main shell 7 and installation pipes 8. There are two installation pipes 8, which are fixedly installed at both ends of the main shell 7. Eight installation slots 9 are symmetrically opened on both sides of the main shell 7, and the installation slots 9 penetrate the inner wall of the main shell 7. The connecting pipe 3 is fixedly connected to the air inlet pipe of the dust removal spray tower 1 and one of the installation pipes 8 on the shell structure 4 by bolts. The four large particle filter screens 6 are located above or below the installation slots 9 respectively. Each heat exchange shell 10 on the waste heat recovery component 5 is fixedly inserted into two installation slots 9. The connecting shell 11 and the connecting bend 12 are located on the outside of the main shell 7. The connecting bend 12 is fixedly connected to the connecting shell 11 fixedly installed at both ends of the main shell 7. Among them, two heat exchange shells 10 are fixedly installed in the main shell 7. The large particle filter plate 6 is located at the lower end of the filter plate 6, while the other two heat exchange shells 10 are located at the upper end of the filter plate 6. The dust-laden high-temperature smelting flue gas is transported to the pre-filter assembly 2 by an induced draft fan or a booster fan. The fan must have high temperature resistance and corrosion resistance to ensure stable operation in high-temperature and high-dust environments. The waste heat recovery assembly 5 is connected to an external heat exchange system (such as a waste heat boiler, hot water circulation system, or steam generator) through a connecting bend 12 and a connecting shell 11 to recover heat energy for production or heating, thus realizing energy reuse. The large particle filter plate 6 is a multi-layer stainless steel corrugated plate filter plate with the following specific characteristics: high temperature resistance and corrosion resistance; the corrugated plate design increases the surface area and improves dust interception efficiency; the mesh size is 50-100μm, suitable for filtering large particles of dust.

[0022] Finally, by installing a pre-filter assembly 2 consisting of a shell structure 4, a waste heat recovery assembly 5, and a large particle filter plate 6 at the air inlet pipe of the dust removal spray tower 1, the dust-laden high-temperature smelting flue gas passes through the pre-filter assembly 2. The heat exchange shells 10, which are staggered on the waste heat recovery assembly 5, can block the dust-laden high-temperature smelting flue gas. This causes large dust particles in the dust-laden high-temperature smelting flue gas to fall due to gravity after impacting the heat exchange shells 10, while the large particle filter plate 6 can further block the dust-laden high-temperature smelting flue gas. Large dust particles in the gas are filtered to achieve the purpose of pre-filtering the dust-laden high-temperature smelting flue gas, thereby reducing the workload of the subsequent dust removal spray tower 1, reducing the probability of scaling and clogging inside the dust removal spray tower 1, reducing the frequency of shutdown and cleaning of the dust removal spray tower 1, and improving the working efficiency of the dust removal spray tower 1. At the same time, water can be injected into the waste heat recovery component 5, so that heat can be exchanged between the waste heat recovery component 5 and the dust-laden high-temperature smelting flue gas, thereby recovering the heat in the dust-laden high-temperature smelting flue gas and reducing heat waste.

[0023] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A dust removal device for smelting flue gas, comprising a dust removal spray tower (1), characterized in that: The dust removal spray tower (1) is connected to a pre-filter assembly (2) via a connecting pipe (3) at its air inlet pipe. The pre-filter assembly (2) consists of a shell structure (4), a waste heat recovery assembly (5), and a large particle filter plate (6). There are four large particle filter plates (6) which are symmetrically fixedly installed on the inner walls of the upper and lower sides of the shell structure (4). The waste heat recovery assembly (5) is fixedly inserted into the shell structure (4). The waste heat recovery assembly (5) consists of a heat exchange shell (10), a connecting shell (11), and a connecting bend (12). There are four heat exchange shells (10) which are staggered vertically. The heat exchange shells (10) are fixedly connected to the large particle filter plate (6). There are eight connecting shells (11) which are fixedly installed at both ends of the four heat exchange shells (10). There are three connecting bends (12) which connect the four heat exchange shells (10) in series.

2. The smelting flue gas dust removal device according to claim 1, characterized in that: The housing structure (4) on the pre-filter assembly (2) consists of a main housing (7) and an installation pipe (8), and there are two installation pipes (8) which are fixedly installed at both ends of the main housing (7).

3. The smelting flue gas dust removal device according to claim 2, characterized in that: The main housing (7) has eight symmetrical mounting slots (9) on its two side walls, and the mounting slots (9) penetrate the inner wall of the main housing (7) both inside and out.

4. The smelting flue gas dust removal device according to claim 3, characterized in that: The connecting pipe (3) is fixedly connected to the air inlet pipe of the dust removal spray tower (1) and one of the installation pipes (8) on the shell structure (4) by bolts.

5. A dust removal device for smelting flue gas according to claim 4, characterized in that: The four large particle filter plates (6) are located above or below the mounting slots (9), respectively.

6. The smelting flue gas dust removal device according to claim 5, characterized in that: Each heat exchange shell (10) on the waste heat recovery assembly (5) is fixedly inserted into two mounting slots (9). The connecting shell (11) and the connecting bend (12) are located outside the main shell (7). The connecting bend (12) is fixedly connected to the connecting shell (11) fixedly installed at both ends of the main shell (7). Two of the heat exchange shells (10) are located at the lower end of the large particle filter plate (6), and the other two heat exchange shells (10) are located at the upper end of the large particle filter plate (6).

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