Underground self-flowing acid unloading device

Abstract

The utility model discloses an underground self-flowing acid unloading device, and belongs to the technical field of concentrated sulfuric acid loading and unloading. The acid discharge tank comprises a pit and a storage tank arranged in the pit, the storage tank comprises a tank body and a cover body arranged on the tank body, and a liquid inlet pipe is arranged on the cover body; wherein a plurality of liquid collecting channels are formed between the bottom of the storage tank and the bottom surface of the pit, and the liquid collecting channels are used for collecting liquid seeping out of the storage tank. Compared with the traditional acid unloading under pressure, the acid unloading device disclosed by the utility model has the advantages that the height difference between the storage tank and the sulfuric acid tank car is used for automatically unloading acid, so that the risk of leakage at the joint of the pipeline and the pump body is effectively reduced. Meanwhile, a plurality of liquid collecting channels are formed between the bottom of the storage tank and the bottom surface of the pit, and the liquid collecting channels can be used for collecting liquid seeping out of the storage tank and then intensively discharging the liquid, so that pollution caused by the fact that acid liquid directly permeates into soil can be effectively prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of concentrated sulfuric acid loading and unloading, and more specifically relates to an underground self-flowing acid unloading device. Background Art

[0002] Titanium dioxide, commonly known as titanium dioxide, is considered to be the best white pigment in the world. It has pure whiteness, high refractive index of light, fine powder with suitable particle size and particle size distribution, stable to light and heat, and chemical inertness. Titanium dioxide is an important raw material in the chemical industry, widely used in papermaking, coatings, plastics, inks, papermaking, rubber, ceramics, enamel or fillers. It is recognized as the best white pigment so far, accounting for more than 80% of all white pigments used.

[0003] At present, titanium dioxide manufacturers in my country generally use the sulfuric acid method to produce titanium dioxide. In order to cooperate with the use of concentrated acid purchased from tank trucks, corresponding loading and unloading equipment is required. For example, the patent CN203545661U discloses a concentrated sulfuric acid negative pressure acid unloading system. The concentrated sulfuric acid negative pressure acid unloading system of this application adopts a gravity negative pressure acid unloading method. The acid unloading process is simple, the acid unloading speed is slow, the system has a high degree of automation, and is safe and reliable. An eccentric screw pump is also used to transport and add concentrated sulfuric acid, integrating the transportation and precise addition of concentrated sulfuric acid. However, in this application, negative pressure acid unloading is used, and the strong corrosiveness of sulfuric acid is inevitably prone to leakage and damage in structural locations such as pipelines or pumps, which poses certain safety and environmental risks to the site.

[0004] For another example, in the patent CN205257981U, an acid unloading device for a concentrated sulfuric acid tank truck is disclosed. This application effectively utilizes the existing concentrated sulfuric acid underground tank transportation facilities to assist in acid unloading. It is easy to operate, safe to use and leak-free. The acid unloading speed is fast, which shortens the acid unloading cycle, reduces the time that the acid unloading tank truck occupies the road, improves the utilization efficiency of the railway lane, and reduces the waste of railway transportation resources. However, this application also has certain defects, that is, once the underground tank leaks, it will be difficult to detect in time, and the leaked acid will directly enter the soil and pollute it. Utility Model Content

[0005] 1. Problems to be solved

[0006] Aiming at the problem that the leaked acid in the existing acid unloading underground tank easily pollutes the soil, the utility model provides an underground self-flowing acid unloading device. The acid unloading device of the utility model can collect the liquid seeping out of the storage tank through the liquid collecting channel, and then discharge it centrally, which can effectively prevent the leaked acid from polluting the soil.

[0007] 2. Technical solution

[0008] In order to solve the above problems, the technical solution adopted by the utility model is as follows:

[0009] The utility model discloses an underground self-flowing acid unloading device, comprising a pit and a storage tank arranged in the pit, wherein the storage tank comprises a tank body and a cover body arranged on the tank body, and a liquid inlet pipe is arranged on the cover body;

[0010] Among them, a plurality of liquid collecting channels are formed between the bottom of the storage tank and the bottom surface of the pit, and the liquid collecting channels are used to collect the liquid seeping out of the storage tank.

[0011] Furthermore, a gap is left between the outer peripheral wall of the storage tank and the inner peripheral wall of the pit, and the gap is connected to the liquid collecting channel.

[0012] Furthermore, a plurality of support parts are provided at intervals on the bottom surface of the pit, the liquid collecting channel is formed between adjacent support parts, and the support parts are not in contact with the inner peripheral wall of the pit; the storage tank is located on the support parts.

[0013] Furthermore, the inner surfaces of the pit and the tank body are provided with an anti-seepage layer and a protective layer in sequence from the inside to the outside.

[0014] Furthermore, the tank body is provided with a drain port and an overflow port, wherein the drain port is arranged at a position close to the bottom of the tank body.

[0015] Furthermore, a liquid level gauge and an air vent are provided on the cover body, wherein the liquid level gauge is used to detect the liquid level height of the liquid in the tank body; and the air vent is in a normally open state.

[0016] Furthermore, the cover body is also provided with a gas detector and a ventilation port.

[0017] Furthermore, a collecting pool is provided at a corner of the bottom surface of the pit, the collecting pool is connected to the liquid collecting channel, and the bottom surface of the pit is inclined toward the collecting pool as a whole.

[0018] Furthermore, the anti-seepage layer is a polyethylene coil, a fiberglass anti-corrosion layer, or a polyurea isolation layer; and the protective layer is cement mortar, water glass mortar, or concrete.

[0019] Furthermore, the pit is a reinforced concrete pit; and the storage tank is a carbon steel tank.

[0020] 3. Beneficial effects

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] (1) The utility model is an underground self-flowing acid unloading device. A storage tank is arranged in a pit. When unloading acid, the sulfuric acid in the sulfuric acid tank truck flows into the storage tank through the liquid inlet pipe. Compared with the traditional pressurized acid unloading, the utility model utilizes the height difference between the storage tank and the sulfuric acid tank truck to unload the acid by gravity, which effectively reduces the risk of leakage at the connection between the pipeline and the pump body. At the same time, a plurality of liquid collecting channels are formed between the bottom of the storage tank and the bottom surface of the pit. The liquid collecting channels can collect the liquid seeping out of the storage tank and then discharge it in a centralized manner, thereby effectively preventing the pollution caused by the direct infiltration of the acid into the soil.

[0023] (2) The utility model provides an underground self-flowing acid unloading device, in which a gap is left between the outer peripheral wall of the storage tank and the inner peripheral wall of the pit. The setting of the gap can facilitate observation of the situation in the liquid collecting channel on the one hand; on the other hand, the existence of the gap makes the maintenance and replacement of the storage tank more convenient and quicker.

[0024] (3) The utility model is an underground self-flowing acid unloading device, in which a collecting tank is provided at the corner of the bottom of the pit, and the collecting tank is connected to the liquid collecting channel, so that the liquid in the liquid collecting channel can be concentrated for convenient discharge; at the same time, the bottom of the pit is tilted toward the collecting tank as a whole, which is conducive to the concentration of the liquid in the pit.

[0025] (4) The utility model provides an underground self-flowing acid unloading device, which can effectively reduce the pressure and gas concentration in the tank by setting the vent to a normally open state, thereby preventing accidents. At the same time, the combustible gas in the tank is monitored in real time by a gas detector. When the monitoring result is greater than a threshold, the ventilation port is opened for forced ventilation, which can further ensure its safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of an underground self-flowing acid unloading device of the utility model;

[0027] Figure 2 It is a top view of an underground self-flowing acid unloading device of the utility model;

[0028] Figure 3 This is a schematic diagram of the internal structure of the storage tank in the utility model;

[0029] Figure 4 for Figure 1 A schematic diagram of the structure enlargement at the center A;

[0030] Figure 5 for Figure 1 A magnified schematic diagram of the structure at point B in the middle.

[0031] In the figure: 1, pit; 11, support part; 12, anti-seepage layer; 13, protective layer; 14, drain outlet; 15, overflow outlet; 16, venting outlet; 17, ventilation outlet; 18, collection tank;

[0032] 2. Storage tank; 21. Tank body; 22. Cover body; 23. Steel section;

[0033] 3. Liquid collecting channel; 4. Gap; 5. Liquid inlet pipe; 6. Pump body; 7. Liquid level meter; 8. Gas detector; 9. Water baffle. DETAILED DESCRIPTION

[0034] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings.

[0035] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] The utility model is further described below in conjunction with specific embodiments.

[0037] refer to Figure 1 As shown, an underground self-flowing acid unloading device of this embodiment includes a pit 1 and a storage tank 2 arranged in the pit 1. Among them, a plurality of liquid collecting channels 3 are formed between the bottom of the storage tank 2 and the bottom surface of the pit 1, and the liquid collecting channels 3 are used to collect the acid liquid seeping from the storage tank 2 to prevent the acid liquid seeping from the storage tank 2 from directly entering the soil and causing pollution.

[0038] Specifically, the pit 1 is a reinforced concrete pit, and the upper edge of the pit 1 is slightly higher than the ground. The bottom surface of the pit 1 is provided with a plurality of mutually parallel support portions 11, and the above-mentioned liquid collecting channel 3 is formed between adjacent support portions 11. Preferably, the support portion 11 is a concrete strip foundation, and the support portion 11 does not contact the inner peripheral wall of the pit 1.

[0039] That is to say, the above-mentioned liquid collecting channels 3 are formed between the end of the support portion 11 and the inner circumferential wall of the pit 1, and between the two outermost support portions 11 and the inner circumferential wall of the pit 1, and a liquid collecting tank is formed between several interconnected liquid collecting channels 3.

[0040] refer to Figure 1 , Figure 2As shown, the storage tank 2 includes a tank body 21 and a cover body 22 arranged on the tank body 21, and a liquid inlet pipe 5 and a pump body 6 are arranged on the cover body 22. The liquid inlet pipe 5 is arranged obliquely as a whole, and the liquid inlet pipe 5 is used to connect with the acid discharge pipe of the sulfuric acid tank to perform acid discharge operation.

[0041] The input end of the pump body 6 extends into the tank body 21 through a pipeline, and the pump body 6 is used to transport the concentrated sulfuric acid in the tank body 21 to the next process. At the same time, in order to transport the concentrated sulfuric acid in the tank body 21 as much as possible, the end of the pipeline is as close to the bottom of the tank body 21 as possible.

[0042] At the same time, in order to ensure the overall strength of the tank body 21, a plurality of parallel steel sections 23 are provided at the bottom of the tank body 21. The tank body 21 is arranged on the support portion 11 through the steel sections 23, and the steel sections 23 and the support portion 11 are arranged perpendicular to each other.

[0043] In the underground self-flowing acid unloading device of the present embodiment, a storage tank 2 is arranged in the pit 1. When unloading acid, the sulfuric acid in the sulfuric acid tank truck flows into the storage tank 2 by gravity through the liquid inlet pipe 5. Compared with the traditional pressurized acid unloading, in the present embodiment, the height difference between the storage tank 2 and the sulfuric acid tank truck is used for self-flowing acid unloading, which effectively reduces the risk of concentrated sulfuric acid leakage at the connection between the pipeline and the pump body. At the same time, by setting the liquid collecting channel 3, the liquid seeping out of the storage tank 2 can be collected and then discharged in a centralized manner, thereby effectively preventing the pollution caused by the acid liquid directly infiltrating into the soil.

[0044] As an implementation method of this embodiment, a gap 4 is left between the outer peripheral wall of the storage tank 2 and the inner peripheral wall of the pit 1, and the gap 4 is connected to the liquid collecting channel 3. The setting of the gap 4 not only facilitates the observation of the accumulated liquid in the liquid collecting channel 3 to judge the working state of the tank body 21, but also makes the maintenance and replacement of the storage tank 2 more convenient and quick.

[0045] At the same time, in order to facilitate the centralized discharge of the accumulated liquid in the liquid collecting channel 3. In this embodiment, a collection pool 18 is provided at the corner of the bottom surface of the pit 1, and the collection pool 18 is connected to the liquid collecting channel 3. Preferably, the bottom surface of the pit 1 is tilted toward the collection pool 18 as a whole, so as to facilitate the collection of the accumulated liquid in the liquid collecting channel 3 to the collection pool 18.

[0046] In this embodiment, as an implementation method of the pit 1, Figure 4 As shown, the pit 1 is a reinforced concrete structure as a whole. At the same time, an impermeable layer 12 and a protective layer 13 are sequentially arranged on the inner surface (including the side wall and the bottom wall) of the pit 1 from the inside to the outside to further reduce the possibility of concentrated sulfuric acid penetrating into the soil through the pit 1.

[0047] Among them, the anti-seepage layer 12 and the protective layer 13 can both adopt existing technologies. For example, the anti-seepage layer 12 can be a polyethylene coil, a fiberglass anti-corrosion layer, or a polyurea isolation layer; the protective layer 13 is cement mortar, water glass mortar, or concrete.

[0048] As an embodiment of the storage tank 2, the tank body 21 of the storage tank 2 is a carbon steel tank. This is because concentrated sulfuric acid has high acidity and viscosity, which can form a protective film to prevent corrosion of the tank body. In addition, concentrated sulfuric acid also has strong oxidizing properties, which can oxidize the surface of carbon steel into a layer of iron sulfate film, thereby further protecting the tank body. Similarly, in order to extend the service life of the tank body 21, an impermeable layer 12 and a protective layer 13 can also be set on the inner surface of the tank body 21.

[0049] An underground self-flowing acid unloading device of this embodiment, referring to Figure 3 As shown, the sealing cover 22 is also provided with an air vent 16, a ventilation port 17 and a gas detector 8. The air vent 16 is normally open and is used to balance the pressure and gas concentration in the tank body 21.

[0050] The gas detector 8 is used to monitor the combustible gas in the tank 21 in real time. The ventilation port 17 is normally closed and is linked to the gas detector 8. When the gas detector 8 detects that the concentration of the combustible gas in the tank 21 is greater than the threshold, the ventilation port 17 automatically opens for forced ventilation to reduce the concentration of the combustible gas and prevent safety accidents.

[0051] In order to ensure that the liquid level of concentrated sulfuric acid in the tank body 21 can be monitored in time, a liquid level gauge 7 is also provided on the cover body 22. At the same time, in order to prevent the liquid level of concentrated sulfuric acid in the tank body 21 from being too high, causing tank safety problems. An overflow port 15 is provided on the tank body 21 at the highest liquid level, and the overflow port 15 is connected to the collection tank through a pipeline. It is worth mentioning that in this embodiment, the pump body 6, the liquid level gauge 7 and the gas detector 8 are all prior arts, and their structures and working principles are not introduced.

[0052] In addition, a drain port 14 is also provided on the tank body 21. Preferably, the drain port 14 is provided at the bottom of the tank body 21 and is connected to the collection tank 18 through a pipeline. Through the provision of the drain port 14, the concentrated sulfuric acid in the tank body 21 can be drained to facilitate subsequent maintenance and replacement operations.

[0053] refer to Figure 5 As shown, in this embodiment, in order to prevent rainwater and debris from entering the liquid collecting channel 3 through the gap 4 between the pit 1 and the storage tank 2, a water retaining plate 9 is provided at the gap 4.

[0054] Specifically, the water baffle 9 is arranged in an inclined manner as a whole, with one end close to the storage tank 2 being the high end and the other end being the low end. The high end of the water baffle 9 has a horizontal extension section, which is located below the cover 22 and fits with the lower surface of the cover 22; the low end of the water baffle 9 has a downwardly extending bending section, which covers the upper edge of the pit 1, and a gap is left between the inner wall of the bending section and the outer wall of the pit 1.

[0055] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. An underground self-flowing acid unloading device, comprising a pit (1) and a storage tank (2) arranged in the pit (1), characterized in that: The storage tank (2) comprises a tank body (21) and a cover body (22) arranged on the tank body (21), and a liquid inlet pipe (5) is arranged on the cover body (22); A plurality of liquid collecting channels (3) are formed between the bottom of the storage tank (2) and the bottom surface of the pit (1), and the liquid collecting channels (3) are used to collect liquid seeping out of the storage tank (2).

2. An underground self-flowing acid unloading device according to claim 1, characterized in that: A gap (4) is left between the outer peripheral wall of the storage tank (2) and the inner peripheral wall of the pit (1), and the gap (4) is connected to the liquid collecting channel (3).

3. An underground self-flowing acid unloading device according to claim 1 or 2, characterized in that: The bottom surface of the pit (1) is provided with a plurality of support portions (11) at intervals, the liquid collecting channel (3) is formed between adjacent support portions (11), and the support portions (11) are not in contact with the inner peripheral wall of the pit (1); the storage tank (2) is located on the support portions (11).

4. An underground self-flowing acid unloading device according to claim 3, characterized in that: The inner surfaces of the pit (1) and the tank body (21) are provided with an impermeable layer (12) and a protective layer (13) in sequence from the inside to the outside.

5. An underground self-flowing acid unloading device according to claim 1, characterized in that: The tank body (21) is provided with a drain port (14) and an overflow port (15), wherein the drain port (14) is arranged at a position close to the bottom of the tank body (21).

6. An underground self-flowing acid unloading device according to claim 5, characterized in that: The cover body (22) is provided with a liquid level gauge (7) and an air vent (16), wherein the liquid level gauge (7) is used to detect the liquid level in the tank body (21); and the air vent (16) is in a normally open state.

7. An underground self-flowing acid unloading device according to claim 6, characterized in that: The cover body (22) is also provided with a gas detector (8) and a ventilation port (17).

8. An underground self-flowing acid unloading device according to claim 1, characterized in that: A collecting pool (18) is provided at a corner of the bottom surface of the pit (1), the collecting pool (18) is connected to the liquid collecting channel (3), and the bottom surface of the pit (1) is inclined toward the collecting pool (18) as a whole.

9. An underground self-flowing acid unloading device according to claim 1, characterized in that: The pit (1) is a reinforced concrete pit; the storage tank (2) is a carbon steel tank.

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