Method for preventing acid mist corrosion by filling hydrochloric acid

Abstract

The invention belongs to the technical field of water treatment equipment, and particularly discloses a method for preventing acid mist corrosion by filling hydrochloric acid, which comprises the following steps: S1, laying a main pipeline; s2, laying a pressure-equalizing short pipe; s3, mounting an outer turning plate; s4, mounting a water purification pipe; and S5, filling hydrochloric acid. The invention provides an acid mist corrosion prevention method for filling hydrochloric acid, which adopts a corrosion-resistant PVC (polyvinyl chloride) main pipeline to guide acid mist discharged during filling of hydrochloric acid into wastewater in a wastewater neutralization tank, and meanwhile, opens a water spraying pipeline to form multiple fountain water curtains, so that the acid mist generated during filling operation is effectively absorbed, and the service life of the acid mist is prolonged. Acid mist is prevented from drifting away along with wind, and nearby mechanical equipment, process pipelines and the like are prevented from being corroded; according to the method, low-degree hydrochloric acid generated by acid mist can be effectively recycled, and the production and operation cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment equipment, and in particular relates to a method for preventing acid mist corrosion in filling hydrochloric acid. Background Art

[0002] Hydrochloric acid tanks are generally installed in water treatment systems. Hydrochloric acid plays a variety of roles in the water treatment process, such as acting as a pH regulator, removing metal ions in water, and being used for biocidal treatment. The hydrochloric acid tanks installed in the water treatment system are generally designed with a DN100 exhaust valve installed on top. The exhaust valve needs to be opened when filling hydrochloric acid. However, during this process, the acid mist that emerges floats in the atmosphere, which is seriously corrosive to the process pipe network and water treatment equipment at the production site. At the same time, the exhaust valve needs to be manually operated before and after the hydrochloric acid filling work, which poses certain safety hazards. This process operation method needs to be improved urgently. Summary of the invention

[0003] The purpose of the present invention is to overcome the above problems existing in the prior art and provide a method for preventing acid mist corrosion during filling of hydrochloric acid. A main pipeline made of corrosion-resistant PVC material is used to drain the acid mist discharged during filling of hydrochloric acid into the wastewater in the wastewater neutralization tank. At the same time, a water spraying pipeline is opened to form a multiple fountain water curtain, thereby effectively absorbing the acid mist generated during the filling operation, preventing the acid mist from drifting with the wind, and preventing corrosion of nearby mechanical equipment and process pipelines. The method can also effectively recycle the low-grade hydrochloric acid generated by the acid mist, thereby reducing the production and operation costs.

[0004] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0005] A method for preventing acid mist corrosion by filling hydrochloric acid, the method comprising the following steps:

[0006] S1. Laying the main pipeline

[0007] Provide a hydrochloric acid tank and a wastewater neutralization tank, lay a main pipeline between the exhaust port of the hydrochloric acid tank and the wastewater neutralization tank, and connect the hydrochloric acid inlet end and the hydrochloric acid outlet end of the main pipeline to the exhaust port of the hydrochloric acid tank and the wastewater neutralization tank respectively;

[0008] S2. Laying of short pressure equalizing pipes

[0009] A short pressure equalizing pipe is installed at the middle position of the main pipeline, and a downward flap is provided in the short pressure equalizing pipe;

[0010] S3. Install the outer flap

[0011] Install an external flap at one end of the main pipe near the wastewater neutralization tank;

[0012] S4: Install water purification pipe

[0013] A clean water pipe parallel to the main pipeline is arranged at one end of the main pipeline near the wastewater neutralization tank, the water inlet end of the clean water pipe is connected to the clean water pipe network, and a plurality of parallel and parallel water spray pipes are vertically arranged at one end of the clean water pipe near the hydrochloric acid outlet end of the main pipeline;

[0014] S5. Filling hydrochloric acid

[0015] Clean water is transported to the clean water pipe through the water purification official website, and then to the water spray pipe. Clean water forms multiple water curtain acid absorption areas through several water spray pipes. The hydrochloric acid outlet end of the main pipeline is located in the multiple water curtain acid absorption areas. The low-concentration hydrochloric acid produced when the hydrochloric acid tank is filled with hydrochloric acid enters the wastewater neutralization tank through the main pipeline and is absorbed and utilized by the wastewater in the wastewater neutralization tank.

[0016] Furthermore, the hydrochloric acid tank is provided with a hydrochloric acid filling port.

[0017] Furthermore, the main pipeline is a DN100 PVC pipe.

[0018] Furthermore, the length of the main pipeline extending into the wastewater neutralization tank is not less than 1000 mm.

[0019] Furthermore, the pressure equalizing short pipe is connected to the main pipeline;

[0020] The pressure equalizing short pipe is a DN75 short pipe.

[0021] Furthermore, a valve 1 is provided on the water purification pipe;

[0022] A second valve is arranged on the water spraying pipeline.

[0023] Furthermore, the water purification pipe is a DN32 pipe;

[0024] The plurality of water spray pipes are all DN15 PVC pipes.

[0025] Furthermore, the number of the water spray pipes is no less than three.

[0026] Furthermore, there is a height difference between the water outlet ends of two adjacent water spray pipes.

[0027] Furthermore, the heights of the plurality of water spray pipes gradually increase along the water flow direction in the clean water pipe.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention provides a method for preventing acid mist corrosion during filling hydrochloric acid. The main pipeline made of corrosion-resistant PVC material is used to drain the acid mist discharged during the filling of hydrochloric acid into the wastewater in the wastewater neutralization tank. At the same time, the water spraying pipeline is opened to form a multiple fountain water curtain, thereby effectively absorbing the acid mist generated during the filling operation, preventing the acid mist from drifting with the wind, and preventing corrosion of nearby mechanical equipment and process pipelines. The method can also effectively recycle the low-grade hydrochloric acid generated by the acid mist, thereby reducing the production and operation costs.

[0030] 2. In the present invention, a short pressure-equalizing tube is installed at the middle position of the main pipeline, and a downward flap is built into the short tube, which can be used as an air inlet when pumping hydrochloric acid during daily use to ensure the atmospheric pressure balance in the hydrochloric acid tank.

[0031] 3. In the present invention, an outer flap is installed at the end of the main pipeline (i.e., the end of the main pipeline located in the wastewater neutralization tank) to ensure that the acid mist generated when the hydrochloric acid tank is filled with hydrochloric acid is exhausted during actual use.

[0032] 4. In the present invention, by setting the main pipeline and valve 1, valve 2, and setting the lower flap and the outer flap, it can be automatically adjusted according to the pressure situation in the hydrochloric acid tank to ensure the pressure balance inside and outside the hydrochloric acid tank and the normal production operation and acid extraction work.

[0033] 5. The method for filling hydrochloric acid to prevent acid mist corrosion provided by the present invention is safe and reliable to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0035] Figure 1 It is a structural schematic diagram of the present invention.

[0036] Among them, the accompanying drawings are marked as: 1. hydrochloric acid tank; 2. wastewater neutralization tank; 3. main pipeline; 4. equalizing short pipe; 40. lower flap; 30. outer flap; 10. hydrochloric acid filling port; 5. clean water pipe; 50. valve one; 51. water spray pipe; 52. valve two. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0039] Hydrochloric acid tanks are generally installed in water treatment systems. Hydrochloric acid plays a variety of roles in the water treatment process, such as acting as a pH regulator, removing metal ions in water, and being used for biocidal treatment. The hydrochloric acid tanks installed in the water treatment system are generally designed with a DN100 exhaust valve installed on top. The exhaust valve needs to be opened when filling hydrochloric acid. However, during this process, the acid mist that emerges floats in the atmosphere, which is seriously corrosive to the process pipe network and water treatment equipment at the production site. At the same time, the exhaust valve needs to be manually operated before and after the hydrochloric acid filling work, which poses certain safety hazards. This process operation method needs to be improved urgently.

[0040] Based on this, the present invention provides a method for preventing acid mist corrosion during filling of hydrochloric acid, wherein a main pipeline made of corrosion-resistant PVC material is used to drain the acid mist discharged during the filling of hydrochloric acid into the wastewater in the wastewater neutralization tank, and at the same time, a water spraying pipeline is opened to form a multiple fountain water curtain, thereby effectively absorbing the acid mist generated during the filling operation, preventing the acid mist from drifting with the wind, and preventing corrosion of nearby mechanical equipment and process pipelines; the method can also effectively recycle the low-grade hydrochloric acid generated by the acid mist, thereby reducing the production and operation costs.

[0041] Example 1

[0042] like Figure 1 As shown, this embodiment provides a method for filling hydrochloric acid to prevent acid mist corrosion, the method comprising the following steps:

[0043] S1. Laying the main pipeline

[0044] A hydrochloric acid tank 1 and a wastewater neutralization tank 2 are provided, and a main pipeline 3 is laid between the exhaust port of the hydrochloric acid tank 1 and the wastewater neutralization tank 2. The main pipeline 3 is made of a DN100 PVC material. The hydrochloric acid inlet end and the hydrochloric acid outlet end of the main pipeline 3 are respectively connected to the exhaust port of the hydrochloric acid tank 1 and the wastewater neutralization tank 2;

[0045] Specifically, the length of the main pipe 3 extending into the wastewater neutralization tank 2 is not less than 1000 mm;

[0046] A hydrochloric acid filling port 10 is provided on the hydrochloric acid tank 1, which is used to fill hydrochloric acid into the hydrochloric acid tank 1 using an acid transport vehicle; the hydrochloric acid filling port is connected to the hydrochloric acid tank 1, and a valve is also provided on it;

[0047] S2. Laying of short pressure equalizing pipes

[0048] A pressure equalizing short pipe 4 connected to the main pipe 3 is installed at the middle position of the main pipe 3. The pressure equalizing short pipe 4 is a DN75 short pipe. The pressure equalizing short pipe 4 is connected to the main pipe 3. A lower flap 40 is provided inside the pressure equalizing short pipe 4.

[0049] The pressure equalizing short tube 4 is used in the daily use of the hydrochloric acid tank 1. It is the air inlet when pumping hydrochloric acid to ensure the atmospheric pressure balance in the tank body of the hydrochloric acid tank 1.

[0050] In addition, a driving member may be provided on the lower flap 40, and the driving member is used to drive the lower flap 40 to rotate. More specifically, the driving member may be a driving motor, and a control button of the driving motor may be installed at a position suitable for operation, or installed on a corresponding controller, so as to realize automatic adjustment of the lower flap 40;

[0051] S3. Install the outer flap

[0052] An outer flap 30 is installed at one end of the main pipe 3 near the wastewater neutralization tank 2;

[0053] An outer flap 30 is provided at the end of the main pipeline 3 (i.e., the end close to the wastewater neutralization tank 2) to ensure the exhaust of acid mist generated when the hydrochloric acid tank 1 is filled with hydrochloric acid;

[0054] In addition, a driving member may be provided on the outer flap 30, and the driving member is used to drive the outer flap 30 to rotate. More specifically, the driving member may be a driving motor, and a control button of the driving motor may be installed at a position suitable for operation, or installed on a corresponding controller, so as to realize automatic adjustment of the outer flap 30;

[0055] S4: Install water purification pipe

[0056] A clean water pipe 5 parallel to the main pipe 3 is provided at one end of the main pipe 3 near the wastewater neutralization tank 2. The clean water pipe 5 adopts a DN32 pipe, and its water inlet end is connected to the clean water network. The clean water network is used to transport clean water to the clean water pipe 5. A valve 1 50 is installed on the clean water pipe 5. A plurality of parallel and parallel water spray pipes 51 are vertically provided at one end of the clean water pipe 5 near the hydrochloric acid outlet end of the main pipe 3, and a valve 2 52 is provided on each of the plurality of water spray pipes 51.

[0057] Several water spray pipes 51 are all DN15 PVC pipes;

[0058] Specifically, the number of the water spray pipes 51 is not less than three;

[0059] S5. Filling hydrochloric acid

[0060] Clean water is transported to the clean water pipe 5 through the water purification official website, and then transported to the water spray pipe 51. Clean water forms multiple water curtain acid absorption areas through several water spray pipes 51. The hydrochloric acid outlet end of the main pipe 3 is located in the multiple water curtain acid absorption areas. The low-concentration hydrochloric acid generated when the hydrochloric acid tank 1 is filled with hydrochloric acid enters the wastewater neutralization tank 2 through the main pipe 3 and is absorbed and utilized by the wastewater in the wastewater neutralization tank 2.

[0061] Specifically, when the hydrochloric acid tank 1 is filled with hydrochloric acid, the water purification valve 50 of the DN32 water purification pipe 5 is opened, and multiple water curtain acid absorption areas are automatically formed to ensure that the low-concentration hydrochloric acid generated when the hydrochloric acid tank 1 is filled with hydrochloric acid enters the wastewater neutralization tank 2 and is absorbed and utilized by the wastewater in the wastewater neutralization tank 2; after the hydrochloric acid filling of the hydrochloric acid tank 1 is completed, the water purification valve 50 of the DN32 water purification pipe 5 and the outer flap 30 on the DN100 main pipeline 3 are automatically closed; the lower flap 40 in the DN75 pressure equalizing short pipe 4 is automatically adjusted according to the pressure situation in the hydrochloric acid tank 1 to ensure the pressure balance inside and outside the hydrochloric acid tank 1 and the normal production operation and acid extraction work;

[0062] During the actual installation process, a plurality of water spray pipes 51 are set, and the water pressure of the water spray pipes 51 can be adjusted through valve 2 52, thereby forming water curtain acid absorption areas of different sizes, ensuring that the low-concentration hydrochloric acid (or acid mist) generated when the hydrochloric acid tank 1 is filled with hydrochloric acid enters the wastewater neutralization tank 2, and is then absorbed and utilized by the wastewater in the wastewater neutralization tank 2. Since multiple water curtain acid absorption areas are formed, it can be ensured that the low-concentration hydrochloric acid (or acid mist) will not overflow, effectively preventing the problem of corrosion of related equipment caused by the low-concentration hydrochloric acid drifting into the air.

[0063] Example 2

[0064] This embodiment provides a method for preventing acid mist corrosion by filling hydrochloric acid, which is different from Embodiment 1 in that, in this embodiment, there is a height difference between the water outlet ends of two adjacent water spray pipes 51;

[0065] Since there is a height difference between the water outlet ends of two adjacent water spray pipes 51 , multiple water curtain acid absorption areas can be formed without adjusting the second valve 52 .

[0066] Example 3

[0067] This embodiment provides a method for preventing acid mist corrosion by filling hydrochloric acid, which is different from Embodiment 1 in that, in this embodiment, the heights of the plurality of water spray pipes 51 gradually increase along the water flow direction in the clean water pipe 5;

[0068] By gradually increasing the height of the plurality of water spray pipes 51 along the water flow direction in the clean water pipe 5, multiple water curtain acid absorption areas can be formed without adjusting the valve 2 51. Moreover, the multiple water curtain acid absorption areas are stacked to form a multiple fountain effect, thereby effectively preventing the escape of low-concentration hydrochloric acid (or acid mist).

[0069] Example 4

[0070] The method for preventing acid mist corrosion during filling hydrochloric acid provided by the present invention is applied in actual production. Specifically, the method is applied to a cold rolling wastewater treatment station in a water supply and drainage workshop of a steel plant. The corrosion of mechanical equipment and process pipelines near the hydrochloric acid tank is effectively controlled, and there is no longer any risk to operator safety or corrosion of on-site process equipment.

[0071] The present invention provides a method for preventing acid mist corrosion during filling of hydrochloric acid. The main pipeline 3 made of corrosion-resistant PVC is used to drain the acid mist discharged from the hydrochloric acid tank 1 when the hydrochloric acid is filled into the wastewater in the wastewater neutralization tank 2. At the same time, a water spraying pipeline 51 is opened to form a multiple fountain water curtain, thereby effectively absorbing the acid mist generated during the filling operation, preventing the acid mist from being blown away by the wind, and preventing the corrosion of nearby mechanical equipment and process pipelines. The method can also effectively recycle the low-grade hydrochloric acid generated by the acid mist, thereby reducing the production and operation costs.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0073] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for preventing acid mist corrosion by filling hydrochloric acid, characterized in that: The method comprises the following steps: S1. Laying the main pipeline Provide a hydrochloric acid tank and a wastewater neutralization tank, lay a main pipeline between the exhaust port of the hydrochloric acid tank and the wastewater neutralization tank, and connect the hydrochloric acid inlet end and the hydrochloric acid outlet end of the main pipeline to the exhaust port of the hydrochloric acid tank and the wastewater neutralization tank respectively; S2. Laying of short pressure equalizing pipes A short pressure equalizing pipe is installed at the middle position of the main pipeline, and a downward flap is provided in the short pressure equalizing pipe; S3. Install the outer flap Install an external flap at one end of the main pipe near the wastewater neutralization tank; S4: Install water purification pipe A clean water pipe parallel to the main pipeline is arranged at one end of the main pipeline near the wastewater neutralization tank, the water inlet end of the clean water pipe is connected to the clean water pipe network, and a plurality of parallel and parallel water spray pipes are vertically arranged at one end of the clean water pipe near the hydrochloric acid outlet end of the main pipeline; S5. Filling hydrochloric acid Clean water is transported to the clean water pipe through the water purification official website, and then to the water spray pipe. Clean water forms multiple water curtain acid absorption areas through several water spray pipes. The hydrochloric acid outlet end of the main pipeline is located in the multiple water curtain acid absorption areas. The low-concentration hydrochloric acid produced when the hydrochloric acid tank is filled with hydrochloric acid enters the wastewater neutralization tank through the main pipeline and is absorbed and utilized by the wastewater in the wastewater neutralization tank.

2. A method for preventing acid mist corrosion by filling hydrochloric acid according to claim 1, characterized in that: The hydrochloric acid tank is provided with a hydrochloric acid filling port.

3. The method for preventing acid mist corrosion by filling hydrochloric acid according to claim 1, characterized in that: The main pipeline is a DN100 PVC pipe.

4. The method for preventing acid mist corrosion by filling hydrochloric acid according to claim 1, characterized in that: The length of the main pipeline extending into the wastewater neutralization tank is not less than 1000 mm.

5. The method for preventing acid mist corrosion by filling hydrochloric acid according to claim 1, characterized in that: The pressure equalizing short pipe is connected to the main pipeline; The pressure equalizing short pipe is a DN75 short pipe.

6. The method for preventing acid mist corrosion by filling hydrochloric acid according to claim 1, characterized in that: The clean water pipe is provided with a valve 1; A second valve is arranged on the water spraying pipeline.

7. The method for preventing acid mist corrosion by filling hydrochloric acid according to claim 1, characterized in that: The water purification pipe is a DN32 pipe; The plurality of water spray pipes are all DN15 PVC pipes.

8. The method for preventing acid mist corrosion by filling hydrochloric acid according to claim 1, characterized in that: The number of the water spray pipes is not less than three.

9. The method for preventing acid mist corrosion by filling hydrochloric acid according to claim 1, characterized in that: There is a height difference between the water outlet ends of two adjacent water spray pipes.

10. The method for preventing acid mist corrosion by filling hydrochloric acid according to claim 1, characterized in that: The heights of the plurality of water spray pipes gradually increase along the water flow direction in the clean water pipe.

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