Air post-treatment system for smelting workshop

Abstract

The utility model discloses an air aftertreatment system for a smelting workshop, and belongs to the field of air treatment. Comprising a spraying assembly, a saline water storage tank and an alkaline solution supply tank. The spraying assembly comprises a spraying tower and a buffer tank, the spraying tower is in through connection with the buffer tank through an overflow pipe, and a liquid pump is arranged outside the buffer tank. A liquid inlet of the liquid pump is communicated and connected with the inner cavity of the buffer tank, and a liquid outlet of the liquid pump is communicated and connected with a spraying device in the spraying tower through a liquid discharging pipe. A first three-way valve is connected to the liquid discharging pipe in series, one outlet of the first three-way valve is communicated with a flow dividing pipe, and the flow dividing pipe is communicated with the saline water storage tank. A second three-way valve is connected to the liquid discharging pipe in series, one inlet of the second three-way valve is in through connection with a liquid supplementing pipe, and the liquid supplementing pipe is in through connection with the alkaline solution supplementing tank. According to the system, air in the smelting workshop can be forcibly collected into the treatment system, acid gas contained in the air is treated and then discharged to the outside, and pollution to the environment is eliminated.

Description

Technical Field

[0001] The present application belongs to the field of air treatment technology, and specifically relates to an air post-treatment system for a smelting workshop. Background Art

[0002] During the magnesium alloy production and melting process, solvents are added to the crucible. The solvent's primary functions are to remove impurities, protect the melt from oxidation, and promote grain refinement. The solvent typically contains chlorides, which decompose at high temperatures into hydrogen chloride gas, an irritating, acidic gas. This acidic gas can spread into the melting shop, corroding the building and equipment, reducing their service life and creating numerous safety hazards.

[0003] Currently, smelting workshops are equipped with ventilation devices on the roof to improve air circulation within the smelting workshop and reduce the corrosion of internal buildings and equipment. However, this method directly releases acidic gases into the outside air, which has an impact on the environment. Utility Model Content

[0004] The technical problem to be solved by this application is: to overcome the shortcomings of the existing technology and provide an air post-treatment system for a smelting workshop. This application can forcibly collect the air inside the smelting workshop into the treatment system, treat the acidic gas contained in the air, and then discharge it to the outside to eliminate pollution to the environment.

[0005] The technical solution adopted by this application to solve the existing problems is:

[0006] A smelting shop air post-treatment system includes a spray assembly, a brine storage tank, and an alkaline solution supply tank.

[0007] The spray assembly includes a spray tower and a buffer tank. The spray tower is connected to the buffer tank through an overflow pipe. The buffer tank is provided with a pH sensor and a liquid pump is provided outside the buffer tank.

[0008] The liquid inlet of the liquid pump is connected to the inner cavity of the buffer tank through the liquid inlet pipe, and the liquid discharge port of the liquid pump is connected to the spray device inside the spray tower through the liquid discharge pipe.

[0009] The liquid discharge pipe is connected in series with a first three-way valve, one outlet of the first three-way valve is connected through a shunt pipe, and the shunt pipe is connected through a brine storage tank.

[0010] The drainage pipe is connected in series with a second three-way valve, one inlet of the second three-way valve is connected to a rehydration pipe, the rehydration pipe is connected to the alkaline solution supply tank, and a supply pump is connected in series with the rehydration pipe.

[0011] Preferably, the first three-way valve and the second three-way valve are both electrically controlled valves.

[0012] Preferably, the spray tower comprises a tower body with an open upper end, and a cover is provided on the upper end of the tower body.

[0013] Preferably, the air inlet pipe is arranged on the tower body, the air inlet pipe is lower than the overflow pipe, and the top of the cover is penetrated by an exhaust pipe.

[0014] Preferably, an induced draft fan is connected in series to the exhaust pipe.

[0015] Preferably, a nozzle is provided inside the tower body, a plurality of nozzle holes are provided on the circular axis surface of the nozzle, and the nozzle is connected to the air inlet pipe.

[0016] Preferably, the spray holes are arc-shaped, and a plurality of spray holes are distributed in a ring array around the axis of the spray head.

[0017] Preferably, the spray device includes an outer ring tube and several straight tubes arranged at intervals in the middle of the ring tube. The two ends of the straight tubes are connected to the ring tube. A distribution pipe is provided above the straight tube. The end of the distribution pipe is connected to the end of the drainage pipe. The distribution pipe is connected to each straight tube through a branch pipe.

[0018] Preferably, a supporting device is provided inside the spray tower, and the spray device is fixedly connected to the spray tower via the supporting device.

[0019] Preferably, the supporting device includes a supporting ring and a clamping frame fixedly connected to the inner side of the supporting ring, the supporting ring is connected to the tower body, and the ring tube is clamped to the clamping frame.

[0020] Compared with the prior art, this application has the following beneficial effects:

[0021] (1) The air inside the smelting workshop is forcibly drawn into the smelting workshop air post-treatment system through the induced draft fan and the air inlet pipe, and the acid gas contained in it is neutralized and separated through the spray assembly, so that the final discharged air does not contain acid gas, avoiding environmental pollution.

[0022] (2) While treating the air in the smelting workshop, sodium chloride solution, i.e. brine, is produced as a by-product, which plays a role in reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present application is further described below with reference to the accompanying drawings and examples.

[0024] Figure 1 This application is a flow chart of the air post-treatment system in a smelting workshop.

[0025] Figure 2This is a structural diagram of a spray assembly in a smelting workshop air post-treatment system.

[0026] Figure 3 This is a cross-sectional view of the spray assembly for this application.

[0027] Figure 4 This is a cross-sectional view of the nozzle in the spray assembly of this application.

[0028] Figure 5 for Figure 4 A top view of

[0029] Figure 6 This is the structural diagram of the spray device in the spray assembly of this application.

[0030] Figure 7 This is a structural diagram of the support device in the spray assembly of this application.

[0031] In the figure: 1-spray tower, 101-tower body, 102-cover, 2-air inlet pipe, 3-spray head, 301-spray hole, 4-exhaust pipe, 5-spray device, 501-ring pipe, 502-straight pipe, 503-distribution pipe, 6-support device, 601-support ring, 602-clamping frame, 7-overflow pipe, 8-buffer tank, 9-liquid pump, 10-liquid inlet pipe, 11-liquid discharge pipe, 12-first three-way valve, 13-diverter pipe, 14-second three-way valve, 15-liquid supply pipe, 16-pH sensor, 17-induced draft fan, 18-brine storage tank, 19-alkaline solution supply tank, 20-supply pump. DETAILED DESCRIPTION

[0032] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0033] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present application and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present application.

[0034] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0035] The accompanying drawings are a preferred embodiment of the air post-treatment system for a smelting workshop. The present application will be further described in detail below with reference to the accompanying drawings.

[0036] Depend on Figures 1 to 7 As shown, a smelting shop air post-treatment system includes a spray assembly, a brine storage tank 18, and an alkaline solution supply tank 19. The spray assembly includes a spray tower 1, which is connected to a buffer tank 8 via an overflow pipe 7. The buffer tank 8 is equipped with a pH sensor 16 and a liquid pump 9 outside the buffer tank 8.

[0037] The liquid inlet of the liquid pump 9 is connected to the inner cavity of the buffer tank 8 through the liquid inlet pipe 10, and the liquid discharge port of the liquid pump 9 is connected to the spray device 5 inside the spray tower 1 through the liquid discharge pipe 11.

[0038] The drainage pipe 11 is connected in series with a first three-way valve 12 , and one outlet of the first three-way valve 12 is connected through a shunt pipe 13 , which is connected through a brine storage tank 18 .

[0039] The drainage pipe 11 is connected in series with a second three-way valve 14 , an inlet of the second three-way valve 14 is connected to a refill pipe 15 , the refill pipe 15 is connected to an alkaline solution supply tank 19 , and a supply pump 20 is connected in series with the refill pipe 15 .

[0040] The first three-way valve 12 and the second three-way valve 14 are both electrically controlled valves. An electrical control box is provided outside the spray tower 1, and a PLC electrical control unit is provided inside the electrical control box. The first three-way valve 12, the second three-way valve 14, the liquid pump 9, and the pH sensor 16 are all electrically connected to the PLC electrical control unit.

[0041] Exhaust gas extracted from the smelting workshop enters spray tower 1. Spray device 5 sprays an alkaline solution downward, reacting with and neutralizing the acid gases contained in the exhaust gas. The treated exhaust gas is free of acid gases and can be discharged directly into the atmosphere. The alkaline solution, after reacting with the acid gases, accumulates as a liquid at the bottom of spray tower 1. Once the liquid level rises above overflow pipe 7, it is discharged through drainage pipe 7 into buffer tank 8.

[0042] A pH sensor 16 installed in the buffer tank 8 monitors the pH of the solution. Based on the test results, the PLC electronic control unit adjusts the opening path of the first three-way valve 12 and the second three-way valve 14. If the pH value is greater than 7, the liquid pump 9 re-pumps the solution in the buffer tank 8 into the spray device 5 for reuse. If the pH value is 7 or less, the solution in the buffer tank 8 is discharged through the shunt pipe 13, and a new alkaline solution is pumped into the spray device 5 through the refill pipe 15.

[0043] Because the acidic gas in the waste gas is primarily composed of hydrogen chloride, in this embodiment, a sodium hydroxide solution is used as the alkaline solution, which reacts to produce sodium chloride and water. Therefore, the solution discharged from the diversion pipe 13 is a sodium chloride solution, which can be sold as an industrial by-product, reducing the cost of waste gas treatment and improving economic benefits.

[0044] The spray tower 1 comprises a tower body 101 with an open top. A cover 102 covers the top of the tower body 101. An air inlet pipe 2 is mounted on the tower body 101. An exhaust pipe 4 extends through the top of the cover 102. An induced draft fan 17 is connected in series to the exhaust pipe 4. The inlet end of the air inlet pipe 2 is mounted directly on the roof of the smelting workshop, where forced air is extracted by the induced draft fan 17. Alternatively, the air inlet pipe 2 can be connected to multiple exhaust pipes mounted above the smelting furnace.

[0045] In order to prolong the reaction time of hydrogen chloride gas and sodium hydroxide solution, in this embodiment, the exhaust gas inlet pipe 2 is lower than the overflow pipe 7, so that the incoming exhaust gas is located below the liquid level and is directly injected into the sodium hydroxide solution.

[0046] To improve reaction efficiency, a nozzle 3 is provided inside the tower body 101. A plurality of nozzle holes 301 are provided on the circular axial surface of the nozzle head 3. The nozzle head 3 is connected to the air inlet pipe 2. The nozzle holes 301 are arc-shaped and are distributed in a circular array around the axis of the nozzle head 3.

[0047] In this way, the gas ejected through the nozzle hole 301 is in a spiral shape, which has a stirring effect on the sodium hydroxide solution, thereby optimizing the reaction efficiency of the sodium hydroxide and hydrogen chloride.

[0048] To increase the spray coverage, the spray device 5 includes an outer annular tube 501 and several straight tubes 502 spaced apart in the middle of the annular tube 501. Spray holes are located at the bottom of the annular tube 501 and the straight tubes 502. Both ends of the straight tubes 502 are connected to the annular tube 501. A distribution tube 503 is located above the straight tubes 502. The end of the distribution tube 503 is connected to the end of the drain pipe 11. The distribution tube 503 is connected to each straight tube 502 via branch pipes.

[0049] A supporting device 6 is provided inside the spray tower 1 , and the spray device 5 is fixedly connected to the spray tower 1 via the supporting device 6 .

[0050] The support device 6 includes a support ring 601 and a clamping frame 602 fixedly connected to the inner side of the support ring 601. The support ring 601 is connected to the tower body 101. In this embodiment, the top surface of the tower body 101 is concavely provided with an annular groove, and the support ring 601 is clamped inside the annular groove. The annular tube 501 is clamped to the clamping frame 602.

[0051] The above describes the implementation methods of the present application in detail in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. A smelting workshop air post-treatment system, characterized by: It includes a spray assembly, a salt water storage tank (18) and an alkaline solution supply tank (19); The spray assembly comprises a spray tower (1) and a buffer tank (8); the spray tower (1) is connected to the buffer tank (8) via an overflow pipe (7); a pH sensor (16) is provided on the buffer tank (8); and a liquid pump (9) is provided outside the buffer tank (8); The liquid inlet of the liquid pump (9) is connected to the inner cavity of the buffer tank (8) through the liquid inlet pipe (10), and the liquid discharge port of the liquid pump (9) is connected to the spray device (5) inside the spray tower (1) through the liquid discharge pipe (11); The drainage pipe (11) is connected in series with a first three-way valve (12), one outlet of the first three-way valve (12) is connected to a shunt pipe (13), and the shunt pipe (13) is connected to a brine storage tank (18); The drainage pipe (11) is connected in series with a second three-way valve (14), one inlet of the second three-way valve (14) is connected to a refill pipe (15), the refill pipe (15) is connected to an alkaline solution supply tank (19), and a supply pump (20) is connected in series with the refill pipe (15).

2. The air post-treatment system for a smelting workshop according to claim 1, characterized in that: The first three-way valve (12) and the second three-way valve (14) are both electrically controlled valves.

3. A smelting shop air post-treatment system according to claim 1 or 2, characterized in that: The spray tower (1) comprises a tower body (101) with an open upper end, and a cover (102) is provided on the upper end of the tower body (101).

4. The air post-treatment system for a smelting workshop according to claim 3, characterized in that: The air inlet pipe (2) is arranged on the tower body (101), the air inlet pipe (2) is lower than the overflow pipe (7), and the top of the cover (102) is penetrated by an exhaust pipe (4).

5. The air post-treatment system for a smelting workshop according to claim 4, characterized in that: The exhaust pipe (4) is connected in series with an induced draft fan (17).

6. The air post-treatment system for a smelting workshop according to claim 5, characterized in that: A nozzle (3) is provided inside the tower body (101), a plurality of nozzle holes (301) are provided on the circular axis surface of the nozzle head (3), and the nozzle head (3) is connected to the air inlet pipe (2).

7. The air post-treatment system for a smelting workshop according to claim 6, characterized in that: The spray holes (301) are arc-shaped, and a plurality of spray holes (301) are distributed in a ring array around the axis of the spray head (3).

8. The air post-treatment system for a smelting shop according to claim 1, 2, 3, 5, 6 or 7, characterized in that: The spray device (5) comprises an outer ring tube (501) and a plurality of straight tubes (502) arranged at intervals in the middle of the ring tube (501). Both ends of the straight tubes (502) are connected to the ring tube (501). A distribution tube (503) is provided above the straight tube (502). The end of the distribution tube (503) is connected to the end of the liquid discharge tube (11). The distribution tube (503) is connected to each straight tube (502) through a branch tube.

9. The air post-treatment system for a smelting workshop according to claim 8, characterized in that: A supporting device (6) is provided inside the spray tower (1), and the spray device (5) is fixedly connected to the spray tower (1) via the supporting device (6).

10. The air post-treatment system for a smelting workshop according to claim 9, characterized in that: The support device (6) comprises a support ring (601) and a clamping frame (602) fixedly connected to the inner side of the support ring (601); the support ring (601) is connected to the tower body (101); and the ring tube (501) is clamped to the clamping frame (602).

Images