Acid pickling tail gas treatment device

Abstract

The utility model relates to the technical field of production and processing of parts, and particularly discloses a pickling tail gas treatment device which comprises a spray tower, a gas inlet pipeline communicated with the bottom of one side of the spray tower, a gas outlet pipeline communicated with the top of one side of the spray tower, an alkali liquor supply structure communicated with one side of the spray tower and an accumulated alkali liquor discharge pipeline communicated with one side of the spray tower, the gas outlet pipeline is provided with a gas flow loop communicated with the gas inlet pipeline through a three-way reversing valve, and the gas inlet pipeline is provided with a first one-way valve for preventing acid-containing tail gas from flowing back, so that the problems of short retention time of the acid-containing tail gas in the tower, short contact time of the acid-containing tail gas and alkali liquor, insufficient mixing and incomplete reaction of the acid-containing tail gas in the traditional acid-containing tail gas treatment device are solved.

Description

Technical Field

[0001] This application relates to the field of parts manufacturing and processing technology, and specifically discloses an acid pickling exhaust gas treatment device. Background Technology

[0002] During the manufacturing process of motorcycle frames, a pickling process is required for surface treatment. Pickling is a common metal surface treatment method, mainly used to remove oxides, rust, and other impurities from metal surfaces.

[0003] In the pickling process, a large amount of acidic exhaust gas is generated during pickling. If the acidic exhaust gas is directly discharged into the atmosphere, it will cause significant pollution. Therefore, in the existing technology, the acidic exhaust gas needs to be treated before it can be discharged.

[0004] The existing pickling tail gas is discharged into an alkaline spray tower for treatment. The tail gas is supplied into the tower from the bottom and the alkaline liquid sprayed out by the alkaline spray head installed in the tower interacts with the tail gas. The tail gas absorbed by the alkaline liquid is discharged through the top of the tower.

[0005] However, the acidic tail gas continuously supplied into the tower has a short residence time inside the tower and a short contact time with the alkaline solution, resulting in insufficient mixing and incomplete reaction.

[0006] Therefore, the inventors have provided an acid washing tail gas treatment device to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to solve the problems of traditional acidic tail gas treatment devices, which have short residence time of acidic tail gas in the tower, short contact time with alkaline solution, insufficient mixing, and incomplete reaction.

[0008] To achieve the above objectives, the basic solution of this utility model provides an acid pickling tail gas treatment device, including a spray tower, an inlet pipe connected to the bottom of one side of the spray tower, an outlet pipe connected to the top of one side of the spray tower, an alkali supply structure connected to one side of the spray tower, and an alkali accumulation discharge pipe connected to one side of the spray tower. The outlet pipe is provided with an airflow circuit connected to the inlet pipe through a three-way reversing valve, and the inlet pipe is provided with a first one-way valve to prevent the backflow of acid-containing tail gas.

[0009] Furthermore, a rotating rod is rotatably connected inside the spray tower, and a pneumatic structure for driving the rotating rod to rotate is provided at the bottom of the spray tower. Several stirring rods located below the alkaline liquid are fixed circumferentially to the rotating rod, and the air inlet pipe is connected to the pneumatic structure.

[0010] Furthermore, the pneumatic structure includes a wind duct fixed to the bottom of the spray tower and coaxially sleeved outside the rotating rod, and blades coaxially fixed to the rotating rod inside the wind duct, with the air inlet pipe connected to the wind duct.

[0011] Furthermore, the connection between the air duct and the rotating rod is closely fitted together, the stirring rod has an exhaust chamber, and the stirring rod also has several exhaust holes communicating with the exhaust chamber. The rotating rod has a ventilation chamber for connecting the exhaust chamber and the inner cavity of the air duct.

[0012] Furthermore, the end of the air outlet pipe located inside the spray tower is connected to a vertically downward-facing columnar dehumidifier that is coaxial with the rotating rod.

[0013] Furthermore, the top of the rotating rod extends out of the alkaline solution accumulation area, and a cleaning rod for cleaning the surface of the columnar dehumidifier is fixedly connected to the top of the rotating rod.

[0014] Furthermore, the airflow circuit is provided with a second one-way valve to prevent airflow backflow.

[0015] The principle and effect of this solution are as follows:

[0016] Compared with the prior art, this utility model, after the acidic tail gas is fed into the spray tower, can control the outlet pipeline to connect to the airflow circuit through a three-way reversing valve, so that the airflow purified by the spray tower is introduced into the spray tower again through the inlet pipeline. After the airflow undergoes secondary and multiple purifications, the inlet pipeline is intermittently closed, and the outlet pipeline is connected to the exhaust pipe to discharge the purified airflow. This cycle continues until the batch is finished, extending the residence time of the acidic tail gas in the spray tower and extending the contact time between the acidic tail gas and the alkaline solution. This solves the problems of short residence time of acidic tail gas in the tower and short contact time with alkaline solution in traditional acidic tail gas treatment devices, resulting in insufficient mixing and incomplete reaction. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the pickling tail gas treatment device proposed in the embodiments of this application is shown;

[0019] Figure 2 A schematic diagram of the pickling tail gas treatment device proposed in the embodiments of this application is shown;

[0020] Figure 3 A partial schematic diagram of the acid washing tail gas treatment device proposed in the embodiments of this application is shown. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0022] The reference numerals in the accompanying drawings include: spray tower 1, rotating rod 2, stirring rod 3, air duct 4, air inlet pipe 5, cleaning rod 6, return pipe 7, exhaust pipe 8, air outlet pipe 9, air pump 10, column dehumidifier 11, and blade 12.

[0023] Pickling tail gas treatment device, implementing, for example Figure 1 and Figure 2 As shown:

[0024] The system includes a spray tower 1, an inlet pipe 5 installed at the bottom left side of the spray tower 1 for supplying acidic tail gas into the spray tower 1, an outlet pipe 9 installed at the top left side of the spray tower 1 for discharging purified tail gas outwards, an alkali supply structure installed at the middle right side of the spray tower 1 for supplying alkali solution into the spray tower 1, and an alkali discharge pipe installed at the bottom right side of the spray tower 1 for discharging accumulated alkali solution. The alkali supply structure includes an alkali supply pipe and a nozzle connected to the alkali supply pipe.

[0025] One end of the exhaust pipe 9 extends into the spray tower 1, and the other end extends out of the spray tower 1 and is connected to a three-way reversing valve. One end of the three-way reversing valve is equipped with an airflow circuit connected to the intake pipe 5, and the other end is equipped with an exhaust pipe 8 connected to the external environment.

[0026] Furthermore, a first check valve is installed on the inlet pipe 5, upstream of its connection to the airflow circuit, to prevent backflow of acidic exhaust gas. A second check valve is installed on the airflow circuit to prevent backflow of airflow. A third check valve is installed on the exhaust pipe 8 to prevent external airflow from entering. Additionally, an air pump 10 is installed on the outlet pipe 9 to actively draw gas from inside the spray tower 1.

[0027] like Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment,

[0028] A rotatable rotating rod 2 is also installed inside the spray tower 1. A pneumatic structure for driving the rotating rod 2 to rotate is installed at the bottom of the spray tower 1. The air inlet pipe 5 is connected to the pneumatic structure to supply airflow to the pneumatic structure. Several stirring rods 3 located below the alkaline liquid are fixedly installed circumferentially on the rotating rod 2.

[0029] Specifically, the pneumatic structure includes a wind tunnel 4 fixedly installed at the bottom of the tower. The wind tunnel 4 has a through hole for the rotating rod 2 to pass through, and in this embodiment, the through hole is fitted to the rotating rod 2. The pneumatic structure also includes blades 12 circumferentially fixedly installed on the rotating rod 2 located inside the wind tunnel 4. The end of the air inlet pipe 5 is connected to the inside of the wind tunnel 4.

[0030] Furthermore, three partitions are installed inside the air duct 4, which divide the internal chamber of the air duct 4 into four equal-volume parts. Two blades 12 are installed on the outer wall of the rotating rod 2 in each part. The end of the air intake pipe 5 is connected to four branch pipes to supply air to the four internal chambers of the air duct 4 respectively.

[0031] An exhaust chamber is also provided inside the stirring rod 3. Several exhaust holes communicating with the exhaust chamber are provided on the stirring rod 3. A ventilation chamber is provided on the rotating rod 2 to connect the exhaust chamber with the four chambers inside the air duct 4.

[0032] The end of the air outlet pipe 9 located inside the spray tower 1 is connected to a vertically downward-facing columnar dehumidifier 11, which is coaxial with the rotating rod 2, and is used to remove moisture from the gas discharged into the air outlet pipe 9. The top of the rotating rod 2 extends out of the alkaline liquid accumulation, and a cleaning rod 6 for cleaning the surface of the columnar dehumidifier 11 is fixedly installed on the top of the rotating rod 2.

[0033] When this utility model is used, the alkaline solution is first supplied into the spray tower 1 through the alkaline solution supply pipeline and the nozzle, and an alkaline solution accumulation is formed at the bottom of the spray tower 1, so that the alkaline solution accumulation covers the stirring rod 3.

[0034] Connect the intake pipe 5, turn on the air pump 10, control the three-way reversing valve to connect the exhaust pipe 9 with the airflow circuit, inject pickling tail gas into the air duct 4, drive the blade 12 to rotate through the pickling tail gas, so that the rotating rod 2 and the stirring rod 3 rotate synchronously, and the alkaline liquid containing pickling tail gas and the pickling tail gas can enter the exhaust chamber through the ventilation chamber, and then be discharged through the exhaust hole. After reacting with the alkaline liquid, it rises and reacts again with the alkaline liquid sprayed downward.

[0035] At this time, the rising airflow that has undergone the first reaction enters the inlet pipe 5 again through the airflow circuit to achieve a secondary reaction. After a certain reaction time, the inlet pipe 5 is closed, and the three-way reversing valve is controlled to connect the outlet pipe 9 with the exhaust pipe 8. After the airflow inside the spray tower 1 is exhausted, the inlet pipe 5 is reopened, and the outlet pipe 9 is connected to the airflow circuit. This cycle continues until the batch is finished.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An apparatus for treating pickling off-gas, characterized by comprising: The spray tower is connected with an air inlet pipeline at the bottom of one side, an air outlet pipeline at the top of one side, a lye feeding structure at one side and a lye liquid accumulation discharging pipeline at one side.

2. The pickling tail gas treatment apparatus according to claim 1, characterized in that, The spray tower is connected with an air inlet pipeline at the bottom of one side, an air outlet pipeline at the top of one side, a lye feeding structure at one side and a lye liquid accumulation discharging pipeline at one side.

3. The pickling tail gas treatment apparatus according to claim 2, characterized in that The wind driving structure comprises a wind cylinder fixed at the bottom of the spray tower and coaxially sleeved outside the rotating rod and a blade coaxially fixed on the rotating rod inside the wind cylinder, and the air inlet pipeline is communicated with the wind cylinder.

4. The pickling tail gas treatment apparatus according to claim 3, characterized in that The wind cylinder and the rotating rod are connected and matched with each other at the connection position, the stirring rod is provided with an exhaust chamber inside, a plurality of exhaust holes are formed on the stirring rod and communicated with the exhaust chamber, and an air passage chamber is formed on the rotating rod and communicated with the exhaust chamber and the inner cavity of the wind cylinder.

5. The pickling tail gas treatment apparatus according to claim 2, characterized in that, The end of the air outlet pipeline in the spray tower is connected with a cylindrical dehumidifier vertically arranged and coaxial with the rotating rod.

6. The pickling tail gas treatment apparatus according to claim 5, characterized in that The top of the rotating rod extends out of the lye liquid accumulation, and a cleaning rod is fixed on the top of the rotating rod for cleaning the surface of the cylindrical dehumidifier.

7. The pickling tail gas treatment apparatus according to claim 1, characterized by The air flow loop is provided with a second one-way valve for preventing air flow backflow.

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