A device for purifying the exhaust gas of a smelting furnace

Abstract

The utility model relates to smelting environmental protection technical field especially, a kind of smelting furnace ring smoke gas purification device.Its technical scheme is through the flue gas collection box that air supply pipe is communicated with calcinator inlet port, the dust bag collector and purification bag dust collector that are communicated in turn, and back to calcinator furnace bottom fan air inlet end, collect the sulfur-containing flue gas of inlet port leakage;Two-stage dust removal retains sulfur dioxide;The purified sulfur-rich flue gas is sent back to furnace bottom and reused;Through adjusting mechanism control flow to stabilize collection tank pressure;Realize automatic closed feeding.The utility model subverts the terminal management mode of traditional dust removal and desulfurization, through the mode of collection, dust removal, reuse, eliminates expensive desulfurization process, realizes the internal circulation of sulfur resource, solves the problem of unorganized emission completely, reduces furnace bottom fan air inlet purification air volume, greatly reduces operating cost, and has excellent environmental protection and economic benefits.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection technology in metallurgy, and in particular to a purification device for flue gas collected around a metallurgical furnace. Background Technology

[0002] In the non-ferrous metal smelting process, the smelting furnace is the most critical core equipment. During its operation, especially when materials are added through the feed inlet, a large amount of flue gas containing high concentrations of sulfur dioxide and dust is generated. If this flue gas is directly released into the workshop and the atmosphere, it will not only cause serious environmental pollution, but also represent a huge waste of the sulfur resources it contains.

[0003] Currently, the industry's conventional approach to treating such fugitive emissions generally adopts a "collection-dust removal-desulfurization" end-of-pipe treatment strategy. This involves collecting the gas through a hood, removing dust using a bag filter, and then passing it through a complex desulfurization system (typically using sodium hydroxide absorption, hydrogen peroxide oxidation, or ion-liquid absorption and desorption) to finally release the compliant emissions into the atmosphere. While this model solves the emission compliance problem, it has significant inherent drawbacks. First, constructing and operating a desulfurization system requires high investment and continuous chemical consumption, greatly increasing the operating costs of smelting production (e.g., sodium hydroxide absorption: high treatment cost; hydrogen peroxide oxidation: large construction investment and produces highly corrosive dilute sulfuric acid, requiring high equipment corrosion resistance; ion-liquid absorption and desorption: large investment and high cost). Second, treating sulfur dioxide, which has significant technological value, as a pure pollutant for neutralization essentially transforms valuable sulfur resources into solid waste, failing to achieve effective resource recycling and contradicting the concept of green and low-carbon development.

[0004] Furthermore, existing technologies do not adequately address the sealing and gas collection efficiency of the smelting furnace inlet, often resulting in incomplete flue gas capture and a poor working environment. Simultaneously, traditional flue gas treatment systems are independent of the production process itself, lacking coordination and unable to intelligently adjust system pressure according to furnace conditions, potentially affecting the stable operation of the roasting furnace. Therefore, a new technology and device that can fundamentally solve these problems is urgently needed. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a smelting furnace annular flue gas purification device.

[0006] This application provides a flue gas purification device for a smelting furnace, including a smelting furnace flue gas collection device, a flue gas collection bag filter for removing dust from the flue gas, and a purification bag filter for treating sulfur dioxide in the flue gas, and further comprising:

[0007] The flue gas collection box is connected to the feed inlet of the roasting furnace through an air supply pipe. It is used to collect and centrally treat the flue gas leaking from the feed inlet of the roasting furnace.

[0008] One flue gas conveying pipe is connected to the regulating mechanism to supply flue gas. One end of the flue gas conveying pipe is connected to the input end of the ring-type dust collector bag filter. The output end of the ring-type dust collector bag filter is fixedly connected to a second flue gas conveying pipe. A dust hopper is fixedly connected to the bottom of the ring-type dust collector bag filter. One end of the second flue gas conveying pipe is fixedly connected to the input end of the high-pressure blower through a flange. The output end of the high-pressure blower is fixedly connected to a third flue gas conveying pipe through a flange. One end of the third flue gas conveying pipe is fixedly connected to the input end of the purification bag filter. The output end of the purification bag filter bag filter is fixedly connected to the input end of the fan room through a fourth flue gas conveying pipe. The output end of the fan room is fixedly connected to the air inlet hopper at the bottom of the roasting furnace through a fourth flue gas conveying pipe.

[0009] Optionally, an adjustment mechanism installed on the upper surface of the flue gas collection box is also included to control the flow rate of the flue gas, thereby regulating the internal pressure of the roasting furnace.

[0010] Optionally, the adjusting mechanism includes a connecting cylinder fixedly connected to the upper surface of the flue gas collection box, an mounting plate installed on one side of the outer wall of the connecting cylinder, a solenoid valve fixedly connected to one side of the outer wall of the mounting plate, a rotating shaft fixedly connected to the output end of the solenoid valve, a bearing seat rotatably connected to the middle of the rotating shaft, a drive plate fixedly connected to the outer wall of the rotating shaft near the solenoid valve, and a fan-shaped adjusting baffle fixedly connected to the outer wall of the rotating shaft away from the solenoid valve.

[0011] Optionally, the adjustment mechanism further includes a connecting rod that can connect multiple drive plates, wherein one end and the middle of each drive plate are rotatably connected to the connecting rod.

[0012] Optionally, a smoke supply pipe is fixedly connected to the inner wall of the connecting cylinder, and a support base is rotatably connected to one end of the fan-shaped adjusting baffle. The fan-shaped adjusting baffle has a fan-shaped design, and sealing strips are provided on both sides of its outer wall to ensure the sealing performance when the adjusting mechanism is closed.

[0013] Optionally, a feeding mechanism installed inside the flue gas collection box is also included for continuously feeding the roasting furnace.

[0014] Optionally, the feeding mechanism is fixedly connected to one side of the outer wall of the roasting furnace, a hopper is fixedly connected to the top inlet of the feeding mechanism, and a conveyor belt connected to the inlet of the roasting furnace is fixedly connected to the outlet on one side of the inside of the feeding mechanism.

[0015] Optionally, the annular dust collector and the purification bag filter are connected in series to form a two-stage dust removal system. The annular dust collector is mainly used to collect coarse dust particles, while the purification bag filter is used to collect fine dust particles, and together they form a purification channel that retains sulfur dioxide in the flue gas.

[0016] Optionally, the connection between the fan room output end and the bottom air inlet of the roasting furnace forms a closed loop that returns the purified flue gas rich in sulfur dioxide to the combustion or reaction zone of the roasting furnace.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] This invention precisely removes dust through dual dust removal while completely retaining sulfur dioxide in the flue gas and returning it to the bottom of the roasting furnace for reuse as process gas. This not only completely eliminates the huge construction and operation costs of the desulfurization system, but also transforms pollutants into production raw materials, realizing the internal circulation of resources and bringing significant economic benefits.

[0019] Furthermore, by setting up a flue gas collection box controlled by an adjustment mechanism and coordinating it with an automatic feeding mechanism, this invention achieves fully enclosed collection and treatment of fugitive emissions. The adjustment mechanism can dynamically balance the system pressure, ensuring an extremely high flue gas capture rate, fundamentally improving the working environment, and avoiding interference with the normal operation of the roasting furnace caused by improper suction pressure. Attached Figure Description

[0020] Figure 1 A schematic diagram of the overall structure of a smelting furnace annular flue gas purification device according to this utility model is provided.

[0021] Figure 2 This is a schematic diagram of the overall back structure;

[0022] Figure 3 This is a schematic diagram of a roasting furnace explosion.

[0023] Figure 4 This is a schematic cross-sectional view of the flue gas collection box;

[0024] Figure 5 This is a schematic diagram of the cross-section of the connecting cylinder;

[0025] Figure 6 This is a schematic diagram of the adjustment mechanism;

[0026] Figure 7 for Figure 6 Enlarged diagram of point A in the middle.

[0027] Attached reference numerals: 1. Roasting furnace; 2. Flue gas collection box; 3. Flue gas conveying pipe one; 4. Circular dust collector bag filter; 5. Flue gas conveying pipe two; 6. Ash hopper; 7. High-pressure blower; 8. Flue gas conveying pipe three; 9. Purification bag filter; 10. Flue gas conveying pipe four; 11. Blower room; 12. Air supply pipe; 13. Adjusting mechanism; 1301. Connecting cylinder; 1302. Solenoid valve; 1303. Rotating shaft; 1304. Drive plate; 1305. Bearing seat; 1306. Connecting rod; 1307. Flue gas supply pipe; 1308. Fan-shaped adjusting baffle; 1309. Support seat; 1310. Mounting plate; 14. Feeding mechanism; 1401. Discharge hopper; 1402. Conveyor belt; 15. Air inlet hopper. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figures 1-4 As shown, this utility model proposes a smelting furnace flue gas purification device, including a roasting furnace 1 for providing a carrier for the roasting reaction, a flue gas collection box 2, a flue gas conveying pipe 3, a ring-collecting dust collector 4, and a purification bag dust collector 9. During the reaction process, the roasting furnace 1 will generate high-temperature flue gas containing dust and sulfur dioxide. The ring-collecting dust collector 4 removes dust from the flue gas, and the purification bag dust collector 9 treats the sulfur dioxide in the flue gas. The flue gas collection box 2 is connected to the feed inlet of the roasting furnace 1 through an air supply pipe 12, and is used to collect and centrally treat the flue gas leaking from the feed inlet of the roasting furnace 1. Like a hood, it sucks in all the leaked flue gas, which is responsible for capturing it at the source and achieving closed collection. The air supply pipe 12 serves as the airflow passage between the flue gas collection box 2 and the feed inlet of the roasting furnace 1, ensuring that the leaked flue gas can be smoothly drawn in. Flue gas conveying pipe 13 is connected to regulating mechanism 13 to supply flue gas. One end of flue gas conveying pipe 13 is connected to the input end of the ring dust collector 4. Flue gas conveying pipe 25 is fixedly connected to the output end of the ring dust collector 4. A dust hopper 6 is fixedly connected to the bottom of the ring dust collector 4. One end of flue gas conveying pipe 25 is fixedly connected to the input end of high pressure blower 7 through a flange. Flue gas conveying pipe 38 is fixedly connected to the output end of high pressure blower 7 through a flange. One end of flue gas conveying pipe 38 is fixedly connected to the input end of purification bag dust collector 9. The output end of purification bag dust collector 9 is fixedly connected to the input end of fan room 11 through flue gas conveying pipe 410. The output end of fan room 11 is fixedly connected to the air inlet hopper 15 at the bottom of roasting furnace 1 through flue gas conveying pipe 410.

[0030] In one implementation, the annular dust collector 4 and the purification bag dust collector 9 are connected in series to form a two-stage dust removal system. The annular dust collector 4 is mainly used to collect coarse dust particles, remove dust particles with larger diameter and higher specific gravity and any sparks that may be present in the flue gas, reduce the load on the subsequent purification bag dust collector 9, and play a role in pre-protection and primary purification. The purification bag dust collector 9 is used to collect fine dust particles. It uses finer filter media and is responsible for collecting the fine dust particles that remain after primary purification, ensuring that the cleanliness of the final output flue gas is extremely high. Together, they form a purification channel that retains sulfur dioxide in the flue gas.

[0031] The connection between the output end of the fan room 11 and the air inlet 15 at the bottom of the roasting furnace 1 forms a closed loop that returns the purified flue gas rich in sulfur dioxide to the combustion or reaction zone of the roasting furnace 1. The following is a detailed explanation of the reuse process:

[0032] In this embodiment, the flue gas collection box 2 first actively collects the dust- and sulfur dioxide-containing flue gas leaking from the feed inlet of the roasting furnace 1 through the air supply pipe 12. The collected flue gas enters the annular dust collector bag filter 4 for first-stage dust removal via the flue gas conveying pipe 3, where larger dust particles are intercepted and fall into the ash hopper 6 at the bottom. The preliminarily purified flue gas is then drawn by the high-pressure blower 7 and enters the purification bag filter 9 through the flue gas conveying pipe 3 for deep second-stage dust removal, further removing fine dust. The key difference from traditional devices is that after this dual dust removal treatment, the sulfur dioxide gas, which is beneficial to the roasting process, is deliberately retained in the flue gas and is not removed. Finally, this clean flue gas rich in sulfur dioxide is transported by the blower room 11 and directly sent back to the air inlet hopper 15 at the bottom of the roasting furnace 1 through the flue gas conveying pipe 4 10, where it participates in the roasting reaction again as a process gas. Its effect is that it eliminates the traditional and complex desulfurization process, which not only greatly saves the equipment investment, chemical consumption and operating costs required for desulfurization, but also realizes the recycling of sulfur resources, thus achieving significant economic and environmental benefits.

[0033] like Figures 4-7 As shown, the flue gas collection box 2 also includes an adjustment mechanism 13 installed on the upper surface of the flue gas collection box 2, which dynamically adjusts the channel opening of the flue gas conveying pipe 3, thereby precisely controlling the flue gas flow rate. By maintaining a slightly negative pressure state inside the flue gas collection box 2, it not only ensures extremely high flue gas capture efficiency, but also prevents interference with the normal pressure conditions and process atmosphere inside the roasting furnace 1 due to excessive suction force, thus achieving a balance between environmental protection and production stability.

[0034] The regulating mechanism 13 includes a connecting cylinder 1301 fixedly connected to the upper surface of the flue gas collection box 2. An installation plate 1310 is installed on one side of the outer wall of the connecting cylinder 1301. A solenoid valve 1302 is fixedly connected to one side of the outer wall of the installation plate 1310. A rotating shaft 1303 is fixedly connected to the output end of the solenoid valve 1302. A bearing seat 1305 is rotatably connected to the middle of the rotating shaft 1303. A drive plate 1304 is fixedly connected to the outer wall of the rotating shaft 1303 on the side close to the solenoid valve 1302. A fan-shaped regulating baffle 1308 is fixedly connected to the outer wall of the rotating shaft 1303 on the side away from the solenoid valve 1302.

[0035] The adjustment mechanism 13 also includes a connecting rod 1306 that can connect multiple drive plates 1304, with one end and the middle of the drive plate 1304 rotatably connected to the connecting rod 1306.

[0036] A smoke supply pipe 1307 is fixedly connected to the inner wall of the connecting cylinder 1301. A support base 1309 is rotatably connected to one end of the fan-shaped adjusting baffle 1308. The fan-shaped adjusting baffle 1308 is designed in a fan shape, and sealing strips are provided on both sides of its outer wall to ensure the sealing performance when the adjusting mechanism 13 is closed.

[0037] In this embodiment, the solenoid valve 1302 is first activated to drive the rotating shaft 1303 to rotate. At this time, the rotation of the rotating shaft 1303 will drive the drive plate 1304 and one of the sector-shaped adjusting baffles 1308 to rotate. Then, the rotation of the drive plate 1304 will drive one end of the connecting rod 1306 to move. Then, the other end of the connecting rod 1306 will push the drive plate 1304 on one side to move synchronously, realizing the linkage effect. This will drive the multiple sector-shaped adjusting baffles 1308 on the inner wall of the flue pipe 1307 to rotate synchronously and adjust. The flow rate is adjusted by the rotation angle of the sector-shaped adjusting baffles 1308. Finally, the rotating shaft 1303 is supported by the bearing seat 1305, and the sector-shaped adjusting baffles 1308 are supported by the support seat 1309, realizing stable adjustment and maintaining stable gas pressure inside and outside the furnace.

[0038] like Figures 1-4 As shown, this embodiment also includes a feeding mechanism 14 installed inside the flue gas collection box 2 for continuously feeding the roasting furnace 1.

[0039] The feeding mechanism 14 is fixedly connected to one side of the outer wall of the roasting furnace 1. A hopper 1401 is fixedly connected to the top inlet of the feeding mechanism 14, and a conveyor belt 1402 connected to the inlet of the roasting furnace 1 is fixedly connected to the outlet on one side of the inside of the feeding mechanism 14. The feeding is described in detail below:

[0040] In this embodiment, a feeding mechanism 14 is installed on one side of the outer wall of the roasting furnace 1, including a hopper 1401 at the top and a discharge port at the bottom connected to the feed port of the roasting furnace 1 via a conveyor belt 1402. The feeding mechanism 14 can continuously and evenly feed the raw materials into the furnace, avoiding the problem of unstable manual feeding, ensuring that the reaction process in the roasting furnace 1 is continuous and improving production efficiency.

[0041] Specifically, during the operation of the roasting furnace 1, the dust-laden, high-concentration sulfur dioxide flue gas that escapes from the feed inlet of the roasting furnace 1 due to poor sealing of the feed is first effectively captured by the flue gas collection box 2. The collection box forms a negative pressure suction with the furnace opening through the air supply pipe 12, ensuring that the leaked flue gas is actively sucked in rather than diffused into the workshop environment.

[0042] The collected flue gas enters the flue gas delivery pipe 3 through the regulating mechanism 13. This regulating mechanism 13 precisely drives the baffle to rotate via the rotating shaft 1303, changing the channel opening. When the pressure inside the flue gas collection box 2 increases, the baffle opening increases, accelerating the flue gas outflow; when the pressure is too low, the opening decreases, slowing the outflow, thus dynamically maintaining a slight negative pressure state inside the collection box. This ensures extremely high flue gas collection efficiency while avoiding interference with the combustion or process atmosphere of the roasting furnace 1 due to excessive suction. The solenoid valve 1302 drives the rotating shaft 1303 to rotate, and the fan-shaped regulating baffle 1308 on the shaft rotates accordingly within the connecting cylinder 1301 and the flue gas delivery pipe 1307. Its fan-shaped design and edge sealing strips ensure airtightness in the closed state. By changing the baffle angle, the opening size of the internal channel can be controlled.

[0043] Subsequently, the flue gas enters the main purification channel and first flows through the ring-collecting dust collector 4 for primary dust removal. Most of the coarse particles, sparks, and heavier dust are intercepted and fall into the ash hopper 6 below. The flue gas, after preliminary purification, is drawn into the purification bag dust collector 9 for secondary deep purification under the traction of the high-pressure fan 7. This stage of dust removal aims to remove the finest dust particles and finally output flue gas with extremely high cleanliness. The entire purification path deliberately avoids any desulfurization or chemical washing links, so that the sulfur dioxide components in the flue gas that are beneficial to the roasting process can be completely preserved.

[0044] The purified flue gas is directly injected into the air inlet hopper 15 at the bottom of the roasting furnace 1 through the fan room 11 and the flue gas conveying pipe 4 10. The gas re-participates in the combustion or metallurgical reaction in the furnace, which not only effectively reuses sulfur resources in the production process and reduces raw material consumption, but also achieves partial energy recovery due to the heat it carries.

[0045] At the same time, the feeding mechanism 14 operates independently and synchronously. The material is fed into the hopper 1401 and, after being adjusted by the feeding mechanism 14, is continuously and automatically fed into the roasting furnace 1 by the closed conveyor belt 1402. The entire feeding process is carried out under the cover of the flue gas collection box 2, so that the flue gas impact that inevitably accompanies the feeding can also be collected instantly.

[0046] The above specific embodiments are merely several optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A flue gas purification device for a smelting furnace, comprising a roasting furnace (1), a flue gas dust collector (4) for removing dust from the flue gas, and a purification bag filter (9) for treating sulfur dioxide in the flue gas, characterized in that, Also includes: The flue gas collection box (2) is connected to the feed inlet of the roasting furnace (1) through the air supply pipe (12) and is used to collect the flue gas leaking from the feed inlet of the roasting furnace (1) and treat it centrally. A flue gas conveying pipe (3) is connected to an adjusting mechanism (13) for conveying flue gas. One end of the flue gas conveying pipe (3) is connected to the input end of a ring-type dust collector (4). A second flue gas conveying pipe (5) is fixedly connected to the output end of the ring-type dust collector (4). A dust hopper (6) is fixedly connected to the bottom of the ring-type dust collector (4). One end of the second flue gas conveying pipe (5) is fixedly connected to the input end of a high-pressure blower (7) via a flange. The output end of the high-pressure blower (7) is fixedly connected to the flue gas conveying pipe three (8) via a flange. One end of the flue gas conveying pipe three (8) is fixedly connected to the input end of the purification bag dust collector (9). The output end of the purification bag dust collector (9) is fixedly connected to the input end of the blower room (11) via the flue gas conveying pipe four (10). The output end of the blower room (11) is fixedly connected to the air inlet hopper (15) at the bottom of the roasting furnace (1) via the flue gas conveying pipe four (10).

2. The smelting furnace annular flue gas purification device according to claim 1, characterized in that, It also includes an adjustment mechanism (13) installed on the upper surface of the flue gas collection box (2) to control the flow rate of flue gas and thereby adjust the internal pressure of the roasting furnace (1).

3. The smelting furnace annular flue gas purification device according to claim 2, characterized in that, The regulating mechanism (13) includes a connecting cylinder (1301) fixedly connected to the upper surface of the flue gas collection box (2). An mounting plate (1310) is installed on one side of the outer wall of the connecting cylinder (1301). A solenoid valve (1302) is fixedly connected to one side of the outer wall of the mounting plate (1310). A rotating shaft (1303) is fixedly connected to the output end of the solenoid valve (1302). A bearing seat (1305) is rotatably connected to the middle of the rotating shaft (1303). A drive plate (1304) is fixedly connected to the outer wall of the rotating shaft (1303) near the solenoid valve (1302). A fan-shaped regulating baffle (1308) is fixedly connected to the outer wall of the rotating shaft (1303) away from the solenoid valve (1302).

4. The smelting furnace annular flue gas purification device according to claim 3, characterized in that, The adjustment mechanism (13) also includes a connecting rod (1306) that can connect multiple drive plates (1304), and one end and the middle of the drive plate (1304) are rotatably connected to the connecting rod (1306).

5. The smelting furnace annular flue gas purification device according to claim 4, characterized in that, The inner wall of the connecting cylinder (1301) is fixedly connected to the smoke supply pipe (1307), and one end of the fan-shaped adjusting baffle (1308) is rotatably connected to the support base (1309). The fan-shaped adjusting baffle (1308) is designed in a fan shape, and sealing strips are provided on both sides of its outer wall to ensure the sealing performance when the adjusting mechanism (13) is closed.

6. The smelting furnace annular flue gas purification device according to claim 1, characterized in that, It also includes a feeding mechanism (14) installed inside the flue gas collection box (2) for continuously feeding the roasting furnace (1).

7. The smelting furnace annular flue gas purification device according to claim 6, characterized in that, The feeding mechanism (14) is fixedly connected to one side of the outer wall of the roasting furnace (1). A feeding hopper (1401) is fixedly connected to the top inlet of the feeding mechanism (14). A conveyor belt (1402) connected to the inlet of the roasting furnace (1) is fixedly connected to the discharge outlet on one side of the inside of the feeding mechanism (14).

8. The smelting furnace annular flue gas purification device according to claim 1, characterized in that, The ring-collecting dust collector (4) and the purification dust collector (9) are connected in series to form a two-stage dust removal system. The ring-collecting dust collector (4) is mainly used to collect coarse dust particles, while the purification dust collector (9) is used to collect fine dust particles. Together, they form a purification channel that retains sulfur dioxide in the flue gas.

9. The smelting furnace annular flue gas purification device according to claim 1, characterized in that, The connection between the output end of the fan room (11) and the bottom air inlet hopper (15) of the roasting furnace (1) forms a closed loop that returns the purified flue gas rich in sulfur dioxide to the combustion or reaction zone of the roasting furnace (1).

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