Acidic and highly corrosive materials safe unloading device

Abstract

The utility model relates to the technical field of safe unloading of highly corrosive materials, specifically to a safe unloading device for acidic highly corrosive materials. The safe unloading device for acidic highly corrosive materials comprises an unloading tank, which is connected to a storage tank through a delivery pump, and the storage tank is connected to a spray tower through a variable frequency vacuum pump. A cofferdam is provided on the outside of the unloading tank, and the unloading tank is connected to a variable frequency vacuum pump through a pipeline for the unloading tank to enter the vacuum pump. The device maintains a slightly negative pressure state of the unloading tank during unloading by setting a variable frequency vacuum pump, a pipeline for the storage tank to enter the vacuum pump, and a pipeline for the unloading tank to enter the vacuum pump, thereby avoiding the direct emission of harmful gases and improving the unloading efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of safe unloading of highly corrosive materials, in particular to a safe unloading device for acidic highly corrosive materials. Background Art

[0002] Concentrated sulfuric acid is highly corrosive: Under normal pressure, boiling concentrated sulfuric acid can corrode all metals except iridium and ruthenium, and has a strong irritating and corrosive effect on skin, mucous membranes and other tissues. Steam or mist can cause conjunctivitis, conjunctival edema, corneal opacity, and even blindness; cause respiratory irritation, and in severe cases, dyspnea and pulmonary edema; high concentrations can cause laryngeal spasm or glottal edema and suffocation and death. Oral administration causes digestive tract burns and ulcers; severe cases may have gastric perforation, peritonitis, kidney damage, shock, etc. Skin burns can cause erythema in mild cases and ulcers in severe cases. After healing, the scars shrink and affect function. Splashing into the eyes can cause burns, even corneal perforation, panophthalmitis and even blindness.

[0003] In chemical production, highly corrosive materials such as concentrated sulfuric acid are used. How to ensure the safety of unloading during the transportation process is crucial. The traditional unloading method is to build a sulfuric acid storage tank underground, and then directly put the tank truck into the storage tank through a hose by the position difference after it arrives, or to build a sulfuric acid storage tank on the ground and build a transfer pit next to it. After the tank truck arrives, it is directly put into the pit through a hose by the position difference, and then the sulfuric acid is sent to the storage tank by a pump. This method requires a large investment and involves problems such as the treatment of sulfuric acid exhaust gas. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the purpose of the utility model is to provide a safe unloading device for acidic and highly corrosive materials. By setting up an unloading tank and a cofferdam, the investment cost is reduced while the safety of unloading is greatly improved; by setting up a variable frequency vacuum pump, a storage tank inlet vacuum pump pipeline and an unloading tank inlet vacuum pump pipeline, a slightly negative pressure state of the unloading tank is maintained during unloading, thereby avoiding the direct emission of harmful gases and improving the unloading efficiency.

[0005] The utility model is realized by adopting the following technical solutions:

[0006] The described safe unloading device for acidic and highly corrosive materials comprises an unloading tank, which is connected to a storage tank through a delivery pump, and the storage tank is connected to a spray tower through a variable frequency vacuum pump. A cofferdam is arranged outside the unloading tank, and the unloading tank is connected to a variable frequency vacuum pump through a vacuum pump pipeline of the unloading tank.

[0007] The cofferdam is used to prevent concentrated sulfuric acid from leaking onto the land and causing environmental pollution. The spray tower contains alkaline solution to neutralize acidic waste gas.

[0008] The unloading tank is provided with a safety valve and a pressure gauge, and the vertical wall of the unloading tank is provided with a feed inlet and an inspection port.

[0009] An alarm is arranged on the inner side of the cofferdam wall, and a guide groove for supporting the unloading pipe is connected to the cofferdam, and the guide groove for supporting the unloading pipe is located on the side close to the feed inlet. When unloading, the unloading hose is connected to the feed inlet, and the pipe is placed on the guide groove for supporting the unloading pipe to prevent high-concentration sulfuric acid from leaking to the ground through the pipe during unloading.

[0010] A discharge port is arranged on the vertical wall of the unloading tank, and a discharge pipe is connected to the discharge port, and the discharge pipe extends into the bottom of the unloading tank.

[0011] The storage tank is provided with a storage tank pressure gauge and a storage tank safety valve, a storage tank vacuum pump inlet pipeline is connected between the storage tank and the variable frequency vacuum pump, and the unloading tank vacuum pump inlet pipeline is connected to the storage tank vacuum pump inlet pipeline.

[0012] A spray plate is arranged inside the spray tower, a circulation pump is connected to the bottom of the spray tower through a pipeline, and the circulation pump is connected to the spray plate through the pipeline.

[0013] The main body of the unloading tank is a storage tank made of stainless steel with a volume of about 1m 3 (The volume can be determined according to actual conditions). This unloading tank is installed on the ground at the pump inlet.

[0014] The working principle of the utility model is:

[0015] After the tank truck arrives at the designated location, it is connected to the feed port through its own hose, the variable frequency vacuum pump is turned on, the circulating pump is started, the spray plate starts working, the slight negative pressure in the unloading tank is maintained, and the tank tank valve is slowly opened to allow concentrated sulfuric acid to enter the unloading tank; pay attention to the pressure indication of the unloading tank; turn on the delivery pump, and pump the liquid phase into the tank through the discharge pipe and the discharge port; after stopping loading, close the tank truck valve, and discharge the remaining concentrated sulfuric acid in the hose to the unloading tank, and extract it to the sulfuric acid storage tank during the next unloading. Among them, the cofferdam is used to prevent concentrated sulfuric acid from leaking onto the land and causing environmental pollution, and the spray tower contains alkali solution to neutralize acidic waste gas. When unloading, the unloading hose is connected to the feed port, and the pipeline is placed on the unloading pipe support guide trough to prevent high-concentration sulfuric acid from leaking to the ground through the pipeline during unloading.

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

[0017] The utility model is adopted for the safe unloading device for acidic and highly corrosive materials. By setting up an unloading tank and a cofferdam, the investment cost is reduced and the safety of unloading is greatly improved. By setting up a variable frequency vacuum pump, a storage tank inlet vacuum pump pipeline and an unloading tank inlet vacuum pump pipeline, a slightly negative pressure state of the unloading tank is maintained during unloading, thereby avoiding the direct emission of harmful gases and improving the unloading efficiency. The pit facilities can be reduced, and sulfuric acid can be directly pumped to the storage tank, thereby reducing investment and shortening the process as much as possible to ensure the safety of the unloading process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the utility model of a safe unloading device for acidic and highly corrosive materials;

[0019] In the figure: 1. Unloading tank; 2. Storage tank; 3. Spray tower; 4. Cofferdam; 5. Feed inlet; 6. Discharge outlet; 7. Discharge pipe; 8. Safety valve of unloading tank; 9. Pressure gauge of unloading tank; 10. Guide trough for supporting unloading pipe; 11. Inspection port; 12. Alarm; 13. Delivery pump; 14. Pressure gauge of storage tank; 15. Safety valve of storage tank; 16. Spray plate; 17. Circulation pump; 18. Variable frequency vacuum pump; 19. Pipeline for vacuum pump inlet to storage tank; 20. Pipeline for vacuum pump inlet to unloading tank. DETAILED DESCRIPTION

[0020] In order to make the purpose and technical solution of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings.

[0021] Example 1

[0022] like Figure 1As shown, the safe unloading device for acidic and highly corrosive materials includes an unloading tank 1, which is connected to a storage tank 2 through a delivery pump 13, and the storage tank 2 is connected to a spray tower 3 through a variable frequency vacuum pump 18. A cofferdam 4 is provided on the outside of the unloading tank 1, and the unloading tank 1 is connected to the variable frequency vacuum pump 18 through an unloading tank vacuum pump pipeline 20. The cofferdam 4 is used to prevent concentrated sulfuric acid from leaking onto the land and causing environmental pollution. The spray tower 3 contains alkali liquid for neutralizing acidic waste gas. The unloading tank 1 is provided with an unloading tank safety valve 8 and an unloading tank pressure gauge 9, and a feed port 5 and an inspection port 11 are provided on the vertical wall of the unloading tank 1. An alarm 12 is provided on the inner side of the vertical wall of the cofferdam 4, and an unloading pipe support guide trough 10 is connected to the cofferdam 4, and the unloading pipe support guide trough 10 is located on the side close to the feed port 5. A discharge port 6 is provided on the vertical wall of the unloading tank 1, and a discharge pipe 7 is connected to the discharge port 6, and the discharge pipe 7 extends into the bottom of the unloading tank 1. A tank pressure gauge 14 and a tank safety valve 15 are provided on the storage tank 2, and a tank vacuum pump inlet pipe 19 is connected between the storage tank 2 and the variable frequency vacuum pump 18, and the unloading tank vacuum pump inlet pipe 20 is connected to the tank vacuum pump inlet pipe 19. A spray plate 16 is provided inside the spray tower 3, and a circulating pump 17 is connected to the bottom of the spray tower 3 through a pipeline, and the circulating pump 17 is connected to the spray plate 16 through a pipeline.

[0023] The above-mentioned safe unloading device for acidic and highly corrosive materials, when in operation, comprises the following steps:

[0024] (1) After the tank truck arrives at the designated location, it is connected to the feed port 5 through its own hose. The hose is placed on the unloading pipe support guide trough 10 to prevent high-concentration sulfuric acid from leaking to the ground through the pipeline during unloading. The variable frequency vacuum pump 18 is turned on, the circulating pump 17 is started, and the spray plate 16 starts working to maintain a slight negative pressure in the unloading tank 1. The tank truck storage tank valve is slowly opened to allow concentrated sulfuric acid to enter the unloading tank 1; (2) Pay attention to the reading of the unloading tank pressure gauge 9, turn on the delivery pump 13, and pump the liquid phase into the storage tank 2 through the discharge pipe 7 and the discharge port 6; (3) After stopping loading, close the tank truck valve and discharge the concentrated sulfuric acid remaining in the hose to the unloading tank 1. The concentrated sulfuric acid will be extracted into the sulfuric acid storage tank 2 during the next unloading.

Claims

1. A safe unloading device for acidic and highly corrosive materials, characterized in that: The unloading tank (1) comprises a vehicle unloading tank (1), the vehicle unloading tank (1) is connected to a storage tank (2) via a delivery pump (13), the storage tank (2) is connected to a spray tower (3) via a variable frequency vacuum pump (18), a cofferdam (4) is arranged outside the vehicle unloading tank (1), and the vehicle unloading tank (1) is connected to a variable frequency vacuum pump (18) via a vehicle unloading tank vacuum pump inlet pipeline (20).

2. The safe unloading device for acidic and highly corrosive materials according to claim 1 is characterized in that: The unloading tank (1) is provided with an unloading tank safety valve (8) and an unloading tank pressure gauge (9), and a feed port (5) and an inspection port (11) are provided on the vertical wall of the unloading tank (1).

3. The safe unloading device for acidic and highly corrosive materials according to claim 2 is characterized in that: An alarm device (12) is arranged on the inner side of the vertical wall of the cofferdam (4), and a guide groove (10) for supporting a vehicle unloading pipe is connected to the cofferdam (4), and the guide groove (10) for supporting a vehicle unloading pipe is located on a side close to the feed port (5).

4. The safe unloading device for acidic and highly corrosive materials according to claim 1 is characterized in that: A discharge port (6) is provided on the vertical wall of the unloading tank (1), and a discharge pipe (7) is connected to the discharge port (6), and the discharge pipe (7) extends into the bottom of the unloading tank (1).

5. The safe unloading device for acidic and highly corrosive materials according to claim 1 is characterized in that: The storage tank (2) is provided with a storage tank pressure gauge (14) and a storage tank safety valve (15); a storage tank vacuum pump inlet pipeline (19) is connected between the storage tank (2) and the variable frequency vacuum pump (18); and a truck unloading tank vacuum pump inlet pipeline (20) is connected to the storage tank vacuum pump inlet pipeline (19).

6. The safe unloading device for acidic and highly corrosive materials according to claim 1 is characterized in that: A spray plate (16) is provided inside the spray tower (3), and a circulation pump (17) is connected to the bottom of the spray tower (3) through a pipeline, and the circulation pump (17) is connected to the spray plate (16) through a pipeline.

Images