Wet removal system for fluoride tail gas of electroslag furnace

Abstract

The utility model discloses a wet removal system for fluoride tail gas of an electroslag furnace. The wet removal system comprises a cyclone dust collector, a filter cartridge dust collector and a spray tower, wherein the air inlet end of the cyclone dust collector is communicated with the electroslag furnace, and the air outlet end of the cyclone dust collector is communicated with the filter cartridge dust collector; wherein the cartridge filter is communicated with the spray tower through a pipeline, and a fan is arranged on the pipeline; wherein the spray tower comprises a tower body, a plurality of filler layers arranged in the tower body, spray frames respectively positioned above the filler layers, an absorbent box for providing an absorbent for the spray frames, a delivery pump and a delivery pipe. When fluoride tail gas of the electroslag furnace is absorbed and removed, particulate matters are firstly removed twice, so that the stability of a subsequent spray tower is ensured, and impurities introduced into the spray tower are prevented from being difficult to clean; in addition, through a wet spraying mode, the fluoride tail gas of the electroslag furnace is effectively absorbed, and the treatment effect close to complete absorption is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of electroslag furnace tail gas treatment, in particular to a wet removal system for fluoride tail gas of an electroslag furnace. Background Art

[0002] An electroslag furnace is a special smelting equipment that uses remelting current to generate heat energy to melt a consumable electrode inserted into a slag bath. After the metal droplets are washed by the slag liquid, they crystallize into an electroslag ingot in a water-cooled mold. Due to the inclusion removal effect of the slag liquid and good crystallization conditions, the electroslag remelted metal has good purity, a fine and uniform as-cast structure, no white spots and annual ring-like segregation, a very low sulfur content, and fine and dispersed inclusions. When refining die steel, an electroslag furnace is required. A large amount of fluorine-containing flue gas generated during the production process of the electroslag furnace will pollute the atmospheric environment.

[0003] However, in the prior art, in actual applications, when the tail gas volume of the electroslag furnace is large, the conventional treatment method for hydrogen fluoride has a poor effect, and there is still a large amount of hydrogen fluoride gas escaping; in addition, there are many particulate matters in the electroslag furnace tail gas. If the particulate matters are not pretreated, the stability of the subsequent absorption reaction tower will be affected inevitably. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a wet removal system for fluoride tail gas of an electroslag furnace, so as to solve the problem that the treatment effect of the conventional method for purifying fluoride tail gas of an electroslag furnace is not ideal.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] The utility model provides a wet removal system for fluoride tail gas of an electroslag furnace, which includes a cyclone dust collector, a cartridge dust collector, and a spray tower;

[0007] Wherein the intake end of the cyclone dust collector is connected to the electroslag furnace through a flue gas inlet pipe, and its outlet end is connected to the cartridge dust collector through a primary filtration conduit;

[0008] Wherein the cartridge dust collector is connected to the spray tower through a pipeline, and a fan is arranged on the pipeline;

[0009] Wherein the spray tower includes a tower body, multiple packing layers arranged in the tower body, a spray rack respectively located above the packing layers, and an absorbent tank, a transfer pump, and a transfer pipe I for providing absorbent for the spray rack.

[0010] Further, a primary filtration discharge valve is arranged at the bottom of the discharge bin of the cyclone dust collector.

[0011] Still further, a secondary filtration discharge valve is arranged at the bottom of the discharge bin of the cartridge dust collector.

[0012] Furthermore, the air outlet of the cartridge dust collector is connected to the fan through a secondary filtration duct, and the air outlet of the fan is transported into the spray tower through a conveying pipe II.

[0013] Furthermore, the tail gas containing fluoride enters the spray tower from below the bottommost packing layer.

[0014] Furthermore, a plurality of manholes are provided on the side wall of the tower body, and the manholes are located between the packing layer and the spray rack.

[0015] Furthermore, the bottom of the tower body is a liquid collection pool, and the liquid collection pool is communicated with the absorbent tank.

[0016] Compared with the prior art, the beneficial technical effects of the present utility model are as follows:

[0017] When the fluoride tail gas of the electroslag furnace is absorbed and removed in the present utility model, it first undergoes two removals of particulate matter, thereby ensuring the stability of the subsequent spray tower, preventing impurities from being introduced into the spray tower and being difficult to clean; in addition, the present application adopts a wet spray method, thereby effectively absorbing and treating the fluoride tail gas of the electroslag furnace, achieving an almost complete treatment effect; and the operating noise of the equipment of the present utility model is significantly reduced compared with the equipment of the prior art. Description of the Drawings

[0018] The present utility model will be further described below with reference to the drawings.

[0019] Figure 1 It is a schematic diagram of the main process equipment of the wet removal system for fluoride tail gas of the electroslag furnace of the present utility model;

[0020] Figure 2 It is a schematic diagram of the spray tower of the wet removal system for fluoride tail gas of the electroslag furnace of the present utility model.

[0021] Description of the reference numerals: 1, cyclone dust collector; 101, flue gas inlet pipe; 102, primary filtration discharge valve; 103, primary filtration duct; 2, cartridge dust collector; 201, secondary filtration discharge valve; 3, fan; 301, secondary filtration duct; 302, conveying pipe II; 4, spray tower; 401, inlet pipe; 402, packing layer; 403, manhole; 404, spray rack; 405, exhaust port; 406, absorbent tank; 407, transfer pump; 408, conveying pipe I; 5, chimney. Detailed Embodiments

[0022] In this embodiment, a wet removal system for fluoride tail gas of an electroslag furnace is disclosed, which includes a cyclone dust collector 1, a cartridge dust collector 2, and a spray tower 4. The intake end of the cyclone dust collector 1 is connected to the electroslag furnace through a flue gas inlet pipe 101, and its outlet end is connected to the cartridge dust collector 2 through a primary filtration conduit 103.

[0023] The cartridge dust collector 2 is connected to the spray tower 4 through a pipeline, and a fan 3 is provided on the pipeline.

[0024] In this embodiment, the spray tower 4 includes a tower body, two packing layers 402 installed in the tower body, a spray rack 404 located above the packing layer 402 respectively, and an absorbent tank 406, a delivery pump 407, and a delivery pipe I 408 for providing absorbent to the spray rack 404. The packing layer is of a porous structure, and the specific type of packing is not limited.

[0025] Usage steps:

[0026] First, the tail gas generated in the electroslag furnace is introduced into the cyclone dust collector 1 through the flue gas inlet pipe 101 for the first filtration of particulate matter. Then, the tail gas treated by the cyclone dust collector 1 is introduced into the cartridge dust collector 2 through the primary filtration conduit 103 for the second filtration of particulate matter. Next, the tail gas from which particulate matter has been separated by the cartridge dust collector 2 is transported to the spray tower 4 through the fan 3 and the pipeline for spray absorption treatment of the fluoride-containing tail gas. Finally, the clean gas from which fluoride has been removed is discharged into the atmosphere. Specifically, the clean air is discharged through a chimney.

[0027] In this embodiment, a primary filtration discharge valve 102 is installed at the bottom of the discharge bin of the cyclone dust collector 1 for regularly discharging the first-filtered particulate matter.

[0028] In this embodiment, a secondary filtration discharge valve 201 is installed at the bottom of the discharge bin of the cartridge dust collector 2 for regularly discharging the second-filtered particulate matter.

[0029] In this embodiment, the air outlet of the cartridge dust collector 2 is connected to the fan 3 through a secondary filtration conduit 301, and the air outlet of the fan 3 is transported to the spray tower 4 through a delivery pipe II 302. Specifically, the fluoride-containing tail gas enters the spray tower 4 from below the bottommost packing layer 402, so as to facilitate sufficient absorption treatment with the absorbent in the spray tower 4.

[0030] Specific absorption principle:

[0031] HF + XOH = XF + H 2 O

[0032] In the formula, XF is a water-soluble salt.

[0033] In this embodiment, a plurality of manholes 403 are provided on the side wall of the tower body, and the manholes 403 are located between the packing layer 402 and the spray rack 404;

[0034] Among them, the bottom of the tower body can be entered through the manhole 403 at the lowest layer to clean the XF crystals precipitated at the bottom thereof.

[0035] In this embodiment, the bottom of the tower body is a liquid collection pool, and the liquid collection pool is communicated with the absorbent tank 406 or recycled through a pipeline and a pump;

[0036] Among them, XOH solution needs to be replenished into the absorbent tank 406 regularly;

[0037] In this embodiment, the absorbent tank 406, the transfer pump 407 and the transfer pipe I 408 are all made of corrosion-resistant materials.

[0038] In this embodiment, the detection data comparison before and after installation is also carried out through the China National Aviation Equipment Inspection Center:

[0039] Among them, the existing equipment detects the treatment of the exhaust gas from the electroslag furnace:

[0040] Fluoride: 0.35mg / m 3 ; Particulate matter is 1.9mg / m 3 ; Noise is 71.5dB(A).

[0041] Among them, the equipment of the present utility model detects the treatment of the exhaust gas from the electroslag furnace:

[0042] Fluoride: 0.07mg / m 3 ; Particulate matter is 1.9mg / m 3 ; Noise is 62.6dB(A).

[0043] The above embodiments only describe the preferred ways of the present utility model creation, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A wet removal system for fluoride tail gas from an electroslag furnace, characterized in that: It comprises a cyclone dust collector (1), a cartridge dust collector (2), and a spray tower (4); The air inlet end of the cyclone dust collector (1) is connected to the electroslag furnace via a flue gas inlet pipe (101), and the air outlet end thereof is connected to the cartridge dust collector (2) via a primary filtering air guide pipe (103); The cartridge dust collector (2) is connected to the spray tower (4) via a pipeline, and a fan (3) is provided on the pipeline; The spray tower (4) comprises a tower body, a plurality of packing layers (402) arranged in the tower body, spray racks (404) respectively located above the packing layers (402), and an absorbent box (406) for providing absorbent to the spray rack (404), a delivery pump (407) and a delivery pipe I (408).

2. The wet removal system for fluoride tail gas from an electroslag furnace according to claim 1, characterized in that: A primary filtering discharge valve (102) is provided at the bottom of the discharge bin of the cyclone dust collector (1).

3. The wet removal system for fluoride tail gas from an electroslag furnace according to claim 1, characterized in that: A secondary filtration discharge valve (201) is provided at the bottom of the discharge bin of the cartridge dust collector (2).

4. The wet removal system for fluoride tail gas from an electroslag furnace according to claim 3, characterized in that: The air outlet of the cartridge dust collector (2) is connected to the fan (3) via a secondary filtration air guide pipe (301), and the air outlet of the fan (3) is transported to the spray tower (4) via a transport pipe II (302).

5. The wet removal system for fluoride tail gas from an electroslag furnace according to claim 4, characterized in that: The tail gas containing fluoride enters the spray tower (4) from below the bottom packing layer (402).

6. The wet removal system for fluoride tail gas from an electroslag furnace according to claim 1, characterized in that: A plurality of manholes (403) are provided on the side wall of the tower body, and the manholes (403) are located between the packing layer (402) and the spray rack (404).

7. The wet removal system for fluoride tail gas from an electroslag furnace according to claim 1, characterized in that: The bottom of the tower body is a liquid collecting tank, and the liquid collecting tank is connected to the absorbent box (406).

Images