CN110159925B - Concentrated sulfuric acid pneumatic conveying system - Google Patents
Concentrated sulfuric acid pneumatic conveying system Download PDFInfo
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- CN110159925B CN110159925B CN201910475008.6A CN201910475008A CN110159925B CN 110159925 B CN110159925 B CN 110159925B CN 201910475008 A CN201910475008 A CN 201910475008A CN 110159925 B CN110159925 B CN 110159925B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/12—Conveying liquids or viscous products by pressure of another fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
Abstract
The concentrated sulfuric acid pneumatic conveying system comprises a concentrated sulfuric acid tank truck (8), a concentrated sulfuric acid storage tank (1) and a concentrated sulfuric acid buffer tank (2) which are sequentially communicated, and further comprises a vacuumizing device (5), an air buffer tank (3) and an air compressor (6) connected with the air buffer tank; the vacuumizing device (5) is connected with the concentrated sulfuric acid storage tank (1) and is used for forming a negative pressure environment in the concentrated sulfuric acid storage tank (1) so that concentrated sulfuric acid is automatically conveyed to the concentrated sulfuric acid storage tank (1) from a concentrated sulfuric acid tank truck (8); the air buffer tank (3) is respectively connected with the concentrated sulfuric acid storage tank (1) and the concentrated sulfuric acid buffer tank (2) and is used for respectively and independently conveying compressed air to the concentrated sulfuric acid storage tank (1) and the concentrated sulfuric acid buffer tank (2) to form a positive pressure environment so that concentrated sulfuric acid in the concentrated sulfuric acid storage tank (1) flows to the concentrated sulfuric acid buffer tank (2) and concentrated sulfuric acid in the concentrated sulfuric acid buffer tank (2) flows to an acid distribution point. The invention realizes the automatic and inorganic pump contact conveying of concentrated sulfuric acid.
Description
Technical Field
The invention relates to the technical field of concentrated sulfuric acid conveying, in particular to a concentrated sulfuric acid pneumatic conveying system.
Background
Concentrated sulfuric acid is a basic chemical, has strong corrosivity and can corrode all metal products. However, sulfuric acid is used in a wide range of applications, such as chemical plants, metallurgical industry, metal processing, petroleum industry gasoline, lubrication and the like, and therefore, safe transportation of concentrated sulfuric acid is a critical process.
At present, concentrated sulfuric acid is conveyed and stored by a pump, and the selection of a corrosion-resistant pump becomes a technical problem. CN 103723668A invented a concentrated sulfuric acid negative pressure acid discharge system, and relates to a method for concentrated sulfuric acid from a tank truck to an acid discharge tank, wherein the concentrated sulfuric acid is conveyed from the acid discharge tank to a sulfuric acid storage tank by adopting an eccentric screw pump, and the use of a pump is still unavoidable. CN 106567942A invented a concentration sulphuric acid conveyor, added with the device and the positioning device for reducing the torque generated by the spring on the sulphuric acid conveyor, to achieve the purpose of accurately conveying concentrated sulphuric acid, but still can not solve the problem of pump corrosion in the concentrated sulphuric acid conveying process.
Disclosure of Invention
The invention provides a concentrated sulfuric acid pneumatic conveying system aiming at the problems and defects in the prior art, which uses a pneumatic part to form a vacuum environment in a device of the system so as to suck the concentrated sulfuric acid into a vacuum environment device, or forms a high-pressure environment in the device of the system so as to drive the concentrated sulfuric acid in the high-pressure environment to flow to other devices, thereby realizing the conveying and the flowing and the transfer of the concentrated sulfuric acid in inorganic pumps in different devices of the system.
The invention has the technical scheme that the concentrated sulfuric acid pneumatic conveying system comprises a concentrated sulfuric acid tank truck, a concentrated sulfuric acid storage tank and a concentrated sulfuric acid buffer tank which are sequentially connected through a concentrated sulfuric acid conveying pipeline, and further comprises a pneumatic part; the concentrated sulfuric acid tank truck is used for transporting concentrated sulfuric acid and conveying the transported concentrated sulfuric acid to a concentrated sulfuric acid storage tank; the concentrated sulfuric acid storage tank is used for conveying the stored concentrated sulfuric acid to the concentrated sulfuric acid buffer tank; the concentrated sulfuric acid buffer tank is connected to the acid preparation point and is used for conveying concentrated sulfuric acid conveyed from the concentrated sulfuric acid storage tank to the acid preparation point; the gas power part is used for providing a low-pressure environment and/or a high-pressure environment and driving concentrated sulfuric acid to flow from the concentrated sulfuric acid tank truck to the concentrated sulfuric acid storage tank, from the concentrated sulfuric acid storage tank to the concentrated sulfuric acid buffer tank and from the concentrated sulfuric acid buffer tank to the acid distribution point.
After the two devices with obviously different internal pressures are communicated, the fluid in the devices flows from the device with high pressure to the device with low pressure, and the invention designs the pneumatic part based on the pneumatic part, compressed air is filled into the device to form a high-pressure environment or air in the device is extracted to form a low-pressure environment or a vacuum environment to be used as the driving force for the concentrated sulfuric acid to flow between different tank bodies, for example, between a concentrated sulfuric acid tank truck filled with the concentrated sulfuric acid and an empty concentrated sulfuric acid storage tank, if concentrated sulfuric acid is conveyed from a concentrated sulfuric acid tank truck to a concentrated sulfuric acid storage tank, two gas power realization modes can be adopted, one is that compressed air is charged to form a higher pressure environment inside the concentrated sulfuric acid tank truck and then the high pressure environment is communicated with the concentrated sulfuric acid storage tank with the internal pressure obviously lower than that of the concentrated sulfuric acid tank truck, the concentrated sulfuric acid flows from a concentrated sulfuric acid tank truck in a high-pressure environment to a concentrated sulfuric acid storage tank in a low-pressure environment due to high-pressure driving; and secondly, a vacuum environment is formed inside the concentrated sulfuric acid storage tank or the pressure is obviously lower than the normal pressure by extracting the air in the concentrated sulfuric acid storage tank, and then the concentrated sulfuric acid tank truck with the internal pressure obviously higher than that of the concentrated sulfuric acid storage tank is communicated, so that the concentrated sulfuric acid flows from the concentrated sulfuric acid tank truck in the high-pressure environment to the concentrated sulfuric acid storage tank in the low-pressure environment due to the suction effect of low pressure. Of course, because of the corrosive effect of the concentrated sulfuric acid, when the compressed air is filled or the air in the tank is extracted, the design of preventing the concentrated sulfuric acid from entering the gas power part due to the pressure difference is indispensable, and meanwhile, the design of a valve or a pipeline for preventing the compressed air or the extracted air and the concentrated sulfuric acid from being conveyed together from a communicated concentrated sulfuric acid conveying pipeline is also considered, and certainly, the design is known by the person skilled in the art, and the invention will be detailed in the following preferred scheme design.
Further, the gas power part comprises a vacuumizing device, the vacuumizing device is connected with a concentrated sulfuric acid storage tank through a second communication valve, and a concentrated sulfuric acid conveying pipeline between the concentrated sulfuric acid storage tank and a concentrated sulfuric acid tank truck is provided with a first communication valve; the vacuumizing device is used for extracting air in the concentrated sulfuric acid storage tank to form a low-pressure or vacuum environment in the concentrated sulfuric acid storage tank, so that concentrated sulfuric acid in the concentrated sulfuric acid tank truck is conveyed to the concentrated sulfuric acid storage tank.
The device is designed into one of devices for realizing pneumatic transmission of concentrated sulfuric acid from a concentrated sulfuric acid tank truck to a concentrated sulfuric acid storage tank, namely a vacuumizing device, so as to form a low-pressure or vacuum environment; the setting of first valve and the setting of second valve are used for controlling the order of evacuation and transport concentrated sulfuric acid, prevent that concentrated sulfuric acid from the direct evacuating device that gets into of concentrated sulfuric acid tank car: and closing the first valve, opening the second valve, vacuumizing the concentrated sulfuric acid storage tank by using the vacuumizing device, closing the second valve to disconnect the vacuum device from the concentrated sulfuric acid storage tank when the vacuum degree of the concentrated sulfuric acid storage tank meets the composite requirement, and opening the first valve to enable the pressure difference to drive the concentrated sulfuric acid to flow from the concentrated sulfuric acid tank truck to the concentrated sulfuric acid storage tank. Of course, the concentrated sulfuric acid storage tank is closed from the other tank bodies during these operations.
Further, the gas power part also comprises an air buffer tank and an air compressor; the air buffer tank is connected with the air compressor through a fourth communication valve, connected with the concentrated sulfuric acid storage tank through a fifth communication valve and connected with the concentrated sulfuric acid buffer tank through a seventh communication valve; a sixth communication valve is arranged on a concentrated sulfuric acid conveying pipeline between the concentrated sulfuric acid storage tank and the concentrated sulfuric acid buffer tank, one end of the concentrated sulfuric acid conveying pipeline extends into the bottom of the concentrated sulfuric acid storage tank to isolate compressed air and a concentrated sulfuric acid conveying passage, and compressed air filled in the concentrated sulfuric acid storage tank is prevented from entering the concentrated sulfuric acid conveying pipeline and entering the concentrated sulfuric acid buffer tank from the concentrated sulfuric acid conveying pipeline; a third communicating valve connected with air is arranged on the concentrated sulfuric acid buffer tank; an eighth communicating valve is arranged between the concentrated sulfuric acid buffer tank and the acid preparation point; the air compressor and the air buffer tank are connected and used for respectively and independently sending compressed air generated by the air compressor to the concentrated sulfuric acid storage tank or the concentrated sulfuric acid buffer tank through the air buffer tank, so that a high-pressure environment is formed in the concentrated sulfuric acid storage tank or the concentrated sulfuric acid buffer tank, and the concentrated sulfuric acid in the concentrated sulfuric acid storage tank or the concentrated sulfuric acid buffer tank is driven to flow to the next node communicated with the concentrated sulfuric acid storage tank or the concentrated sulfuric acid.
According to the design of the invention, the gas power between the concentrated sulfuric acid storage tank and the concentrated sulfuric acid buffer tank and between the concentrated sulfuric acid buffer tank and the acid distribution point is high pressure formed by compressed air, so that the air compressor and the air buffer tank are used as high pressure generating devices, and the compressed air respectively enters the concentrated sulfuric acid storage tank and the concentrated sulfuric acid buffer tank. Similarly, the purpose of the various valve designs is to make the concentrated sulfuric acid flow only between the concentrated sulfuric acid storage tank and the concentrated sulfuric acid buffer tank, and between the concentrated sulfuric acid buffer tank and the acid distribution point, respectively, to avoid flowing into other parts of the system, for example, when the concentrated sulfuric acid storage tank is inflated by an air compressor through the air buffer tank to form high pressure, opening a fourth communicating valve to communicate the air compressor and the air buffer tank, opening a fifth communicating valve to communicate the air buffer tank and the concentrated sulfuric acid storage tank, opening a sixth communicating valve to communicate the concentrated sulfuric acid storage tank and the concentrated sulfuric acid buffer tank, opening a third communicating valve to communicate the concentrated sulfuric acid buffer tank and the atmospheric environment, a gas passage from the air buffer tank to the concentrated sulfuric acid storage tank and a concentrated sulfuric acid conveying passage from the concentrated sulfuric acid storage tank to the concentrated sulfuric acid buffer tank are formed, and the third communication valve is opened to prevent the pressure inside the concentrated sulfuric acid buffer tank from being held when concentrated sulfuric acid enters; simultaneously closing the first communication valve, the second communication valve, the seventh communication valve and the eighth communication valve to prevent concentrated sulfuric acid from entering; by analogy, when the concentrated sulfuric acid buffer tank is inflated by the air compressor through the air buffer tank to form high pressure, compared with the state that the concentrated sulfuric acid storage tank is inflated by the air compressor through the air buffer tank, the fifth communication valve, the sixth communication valve and the third communication valve need to be closed, and the seventh communication valve and the eighth communication valve need to be opened.
Furthermore, a pressure reducing valve is arranged between the air compressor and the air buffer tank and is used for controlling the pressure of air entering the air buffer tank to be kept stable; and a liquid level meter is arranged on the concentrated sulfuric acid buffer tank and used for monitoring the concentrated sulfuric acid liquid level in the concentrated sulfuric acid buffer tank.
Still further, a concentrated sulfuric acid storage tank pressure gauge is arranged on the concentrated sulfuric acid storage tank and used for monitoring the pressure in the concentrated sulfuric acid storage tank; and the air buffer tank is provided with a safety valve for timely discharging air in the air buffer tank.
Still further, the concentrated sulfuric acid conveying pipeline between the concentrated sulfuric acid tank truck and the concentrated sulfuric acid storage tank extends into the bottom of the concentrated sulfuric acid storage tank, a buffer device is arranged at the bottom of the concentrated sulfuric acid storage tank, and the buffer device is a conical receiving pipe with a thick upper part and a thin lower part so as to reduce the impact of the concentrated sulfuric acid on the bottom of the concentrated sulfuric acid storage tank.
Still further, the level meter is any one of a radar level meter, a double-flange level meter, a float level meter, a magnetic turning plate level meter and a glass plate level meter.
Still further, the process pipeline between the concentrated sulfuric acid tank truck, the concentrated sulfuric acid storage tank and the concentrated sulfuric acid buffer tank which are sequentially connected to the acid distribution point adopts a lined carbon steel material or a titanium alloy material, and the lining of the carbon steel adopts polytetrafluoroethylene or carbon fiber.
Still further, the concentrated sulfuric acid storage tank is made of carbon steel, PVDF, HDPE materials or glass fiber reinforced plastic materials lined with polytetrafluoroethylene/carbon fibers.
Still further, above-mentioned concentrated sulfuric acid storage tank is placed underground and at the outer wall around the heat tracing coil pipe, prevents that concentrated sulfuric acid low temperature crystallization from influencing transport and use.
The invention has the advantages that:
1) the invention adopts negative pressure and/or positive pressure to drive and convey the concentrated sulfuric acid, avoids using concentrated sulfuric acid corrosion parts such as a pump and the like, so that concentrated sulfuric acid medium in the whole conveying system does not contact the pump, avoids corrosion of the pump, and has the advantages of safe and environment-friendly system, less investment and high reliability
2) The positive pressure conveying of the invention adopts the mode of additionally arranging the middle buffer tank, the liquid level meter and the like, thereby realizing the automatic flow accurate conveying.
3) The invention can realize that the whole process of concentrated sulfuric acid delivery is carried out in the closed equipment, thereby avoiding the occurrence of accidents of concentrated sulfuric acid leakage.
Drawings
These and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the following detailed description of the embodiments of the invention, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of the structure and process flow of a concentrated sulfuric acid pneumatic conveying system of the present invention;
wherein: wherein: the system comprises a concentrated sulfuric acid storage tank 1, a concentrated sulfuric acid buffer tank 2, an air buffer tank 3, an air buffer tank pressure gauge 4, a vacuumizing device 5, an air compressor 6, a liquid level meter 7, a concentrated sulfuric acid tank truck 8, a concentrated sulfuric acid storage tank pressure gauge 9, a first communicating valve, a second communicating valve, a third communicating valve, a fourth communicating valve, a safety valve and a pressure reducing valve 20.
Detailed Description
In order that those skilled in the art will better understand the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description of the invention.
Example 1
A concentrated sulfuric acid pneumatic conveying system is structurally shown in figure 1, and comprises a concentrated sulfuric acid tank truck 8, a concentrated sulfuric acid storage tank 1 and a concentrated sulfuric acid buffer tank 2 which are sequentially communicated through a concentrated sulfuric acid conveying pipeline, and further comprises a vacuum device 5, an air buffer tank 3 and an air compressor 6; the specific functions and connections are as follows: the concentrated sulfuric acid tank truck 8 is used for transporting concentrated sulfuric acid and conveying the transported concentrated sulfuric acid to the concentrated sulfuric acid storage tank 1, and a first communication valve 10 is arranged on a concentrated sulfuric acid conveying pipeline between the concentrated sulfuric acid storage tank 1 and the concentrated sulfuric acid tank truck 8; the concentrated sulfuric acid storage tank 1 is used for conveying stored concentrated sulfuric acid to the concentrated sulfuric acid buffer tank 2, a sixth communication valve 15 is arranged on a concentrated sulfuric acid conveying pipeline between the concentrated sulfuric acid storage tank 1 and the concentrated sulfuric acid buffer tank 2, and one end of the concentrated sulfuric acid conveying pipeline extends into the bottom of the concentrated sulfuric acid storage tank 1; the concentrated sulfuric acid buffer tank 2 is connected with an acid distribution point through an eighth communication valve 17 and is used for conveying concentrated sulfuric acid conveyed from the concentrated sulfuric acid storage tank 1 to the acid distribution point; the vacuumizing device 5 is connected with the concentrated sulfuric acid storage tank 1 through a second communication valve 11 and is used for sucking air in the concentrated sulfuric acid storage tank 1 to form a low-pressure or vacuum environment in the concentrated sulfuric acid storage tank 1, so that concentrated sulfuric acid in the concentrated sulfuric acid tank truck 8 is conveyed to the concentrated sulfuric acid storage tank 1, namely, the concentrated sulfuric acid is conveyed under negative pressure; air buffer tank 3 is connected with air compressor 6 through fourth intercommunication valve 13, be connected with concentrated sulfuric acid storage tank 1 through fifth intercommunication valve 14, be connected with concentrated sulfuric acid buffer tank 2 through sixth intercommunication valve 15, be provided with the third intercommunication valve 12 of connecting the air on concentrated sulfuric acid buffer tank 2, can see out, the purpose of this design is, the compressed air that air compressor 6 produced sends to concentrated sulfuric acid storage tank 1 and concentrated sulfuric acid buffer tank 2 respectively alone through air buffer tank 3, make concentrated sulfuric acid storage tank 1 or concentrated sulfuric acid buffer tank 2 form high pressure environment in, drive concentrated sulfuric acid wherein to the next node flow that communicates with it, malleation drive concentrated sulfuric acid is carried to concentrated sulfuric acid buffer tank 2 from concentrated sulfuric acid storage tank 1 respectively promptly, carry to the acid distribution point from concentrated sulfuric acid buffer tank 2.
In order to realize the delivery of concentrated sulfuric acid more accurately and more smoothly, the invention preferably arranges a pressure reducing valve 20 between the air compressor 6 and the air buffer tank 3, which is used for controlling the pressure of air entering the air buffer tank 3 to keep stable; a liquid level meter 7 is arranged on the concentrated sulfuric acid buffer tank 2 and used for monitoring the concentrated sulfuric acid liquid level in the concentrated sulfuric acid buffer tank 2; a concentrated sulfuric acid storage tank pressure gauge 9 is arranged on the concentrated sulfuric acid storage tank 1 and used for monitoring the pressure in the concentrated sulfuric acid storage tank 1 and controlling the opening and closing of a first communication valve and a second communication valve which are connected with the concentrated sulfuric acid storage tank 1 in real time; the air buffer tank 3 is provided with a safety valve 19 for discharging residual air in the air buffer tank 3 at proper time. The liquid level meter 7 is any one of a radar liquid level meter, a double-flange liquid level meter, a buoy liquid level meter, a magnetic turning plate liquid level meter and a glass plate liquid level meter.
Because the medium conveyed by the invention is concentrated sulfuric acid which has strong corrosivity and is easy to cause potential safety hazard, the material aspects of the concentrated sulfuric acid storage tank, the connecting pipeline and the tank body are preferably designed, for example, the concentrated sulfuric acid conveying pipeline between the concentrated sulfuric acid tank truck 8 and the concentrated sulfuric acid storage tank 1 is preferably designed to extend into the bottom of the concentrated sulfuric acid storage tank 1, the bottom of the concentrated sulfuric acid storage tank 1 is provided with a buffer device, and the buffer device is a conical receiving pipe with a thick upper part and a thin lower part so as to reduce the impact of the concentrated sulfuric acid on the bottom of the concentrated sulfuric acid; the concentrated sulfuric acid delivery pipeline between the concentrated sulfuric acid tank truck 8, the concentrated sulfuric acid storage tank 1 and the concentrated sulfuric acid buffer tank 2 which are connected in sequence and an acid distribution point is made of a lined carbon steel material or a titanium alloy material, and the lining of the carbon steel is made of polytetrafluoroethylene or carbon fiber; the concentrated sulfuric acid storage tank 1 is made of carbon steel, PVDF (polyvinylidene fluoride) and HDPE (high-density polyethylene) materials or glass fiber reinforced plastic materials lined with polytetrafluoroethylene/carbon fibers; meanwhile, the characteristic of concentrated sulfuric acid is considered, the concentrated sulfuric acid storage tank 1 is arranged underground, and the heat tracing coil pipe is arranged on the outer wall of the concentrated sulfuric acid storage tank in a surrounding mode, so that the influence of low-temperature crystallization of the concentrated sulfuric acid on conveying and use is avoided.
Example 2
A concentrated sulfuric acid pneumatic transmission process using the concentrated sulfuric acid pneumatic transmission system described in embodiment 1, comprising the following processes: the default starting state is that all the communication valves are in a closed state;
(1) the process for injecting concentrated sulfuric acid into a concentrated sulfuric acid storage tank at negative pressure comprises the following steps: opening a second communication valve 11, communicating a concentrated sulfuric acid storage tank 1 with a vacuumizing device 5, opening the vacuumizing device 5, vacuumizing the concentrated sulfuric acid storage tank 1 to a vacuum state, closing the second communication valve 11, cutting off the communication between the concentrated sulfuric acid storage tank 1 and the vacuumizing device 5, connecting a concentrated sulfuric acid tank truck 8 to an inlet of the concentrated sulfuric acid storage tank 1, and opening a first communication valve 10, so that concentrated sulfuric acid is automatically injected into the concentrated sulfuric acid storage tank 1 from the tank truck 8;
(2) the concentrated sulfuric acid is conveyed from the concentrated sulfuric acid storage tank 1 to the concentrated sulfuric acid buffer tank 2 under positive pressure: opening a third communicating valve 12, keeping the flow of emptying concentrated sulfuric acid smooth, opening a fourth communicating valve 13, setting the pressure of a pressure reducing valve 20, communicating an air compressor 6 with an air buffer tank 3, opening a sixth communicating valve 15, communicating a concentrated sulfuric acid storage tank 1 with a concentrated sulfuric acid buffer tank 2, opening a fifth communicating valve 14, communicating the concentrated sulfuric acid storage tank 1 with the air buffer tank 3, starting the air compressor 6, allowing compressed air to flow through the pressure reducing valve 20 and the fourth communicating valve 13 through an outlet of the air compressor 6, entering the air buffer tank 3, then entering the concentrated sulfuric acid storage tank 1 to charge the concentrated sulfuric acid storage tank 1, allowing the concentrated sulfuric acid to enter the concentrated sulfuric acid buffer tank 2 from the concentrated sulfuric acid storage tank 1 under the driving of air pressure, and observing the liquid level meter 7 of the concentrated sulfuric acid buffer tank 2 to observe the addition of the concentrated; then, the fifth communication valve 14 is closed, the sixth communication valve 15 is closed, the communication between the air buffer tank 3 and the concentrated sulfuric acid storage tank 1 and the communication between the air buffer tank 3 and the concentrated sulfuric acid buffer tank 2 are cut off, and the third communication valve 12 is closed at the same time;
(3) conveying concentrated sulfuric acid from a concentrated sulfuric acid buffer tank 2 to a concentrated sulfuric acid preparation point: and opening an eighth communication valve 17 to communicate the concentrated sulfuric acid buffer tank 2 with the acid preparation point, opening a seventh communication valve 16 to communicate the air buffer tank 3 with the concentrated sulfuric acid buffer tank 2, wherein the concentrated sulfuric acid slowly flows to the acid preparation point under the driving of air pressure, and the purpose of accurately preparing the acid is achieved by controlling the liquid level of the buffer tank.
It can be seen that in the concentrated sulfuric acid negative pressure injection process in the flow (1), the concentrated sulfuric acid is conveyed from the concentrated sulfuric acid tank truck 8 to the concentrated sulfuric acid storage tank 1 in a self-flowing negative pressure mode; the concentrated sulfuric acid positive pressure conveying process in the flows (2) and (3) adopts a mode of additionally arranging an intermediate buffer tank and a liquid level meter to realize automatic flow accurate conveying. The whole process is carried out in closed equipment, the accident of leakage of concentrated sulfuric acid is avoided, the concentrated sulfuric acid medium does not contact a mechanical pump, the corrosion of the mechanical pump is avoided, and the process is safe and environment-friendly, low in investment and high in reliability.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A concentrated sulfuric acid pneumatic conveying system is characterized by comprising a concentrated sulfuric acid tank truck (8), a concentrated sulfuric acid storage tank (1) and a concentrated sulfuric acid buffer tank (2) which are sequentially connected through a concentrated sulfuric acid conveying pipeline, and further comprising a pneumatic power part;
the concentrated sulfuric acid tank truck (8) is used for transporting concentrated sulfuric acid and conveying the transported concentrated sulfuric acid to the concentrated sulfuric acid storage tank (1);
the concentrated sulfuric acid storage tank (1) is used for conveying the stored concentrated sulfuric acid to the concentrated sulfuric acid buffer tank (2);
the concentrated sulfuric acid buffer tank (2) is connected to an acid preparation point and is used for conveying concentrated sulfuric acid conveyed from the concentrated sulfuric acid storage tank (1) to the acid preparation point;
the gas power part is used for providing a low-pressure environment and/or a high-pressure environment, driving concentrated sulfuric acid to flow from a concentrated sulfuric acid tank truck (8) to a concentrated sulfuric acid storage tank (1), from the concentrated sulfuric acid storage tank (1) to a concentrated sulfuric acid buffer tank (2) and from the concentrated sulfuric acid buffer tank (2) to an acid distribution point,
the gas power part comprises a vacuumizing device (5), the vacuumizing device (5) is connected with a concentrated sulfuric acid storage tank (1) through a second communication valve (11), and a concentrated sulfuric acid conveying pipeline between the concentrated sulfuric acid storage tank (1) and a concentrated sulfuric acid tank car (8) is provided with a first communication valve (10);
the vacuum extractor (5) is used for extracting air in the concentrated sulfuric acid storage tank (1) to form a low-pressure or vacuum environment in the concentrated sulfuric acid storage tank (1), so that concentrated sulfuric acid in the concentrated sulfuric acid tank truck (8) is conveyed to the concentrated sulfuric acid storage tank (1),
the gas power part also comprises an air buffer tank (3) and an air compressor (6);
the air buffer tank (3) is connected with the air compressor (6) through a fourth communication valve (13), is connected with the concentrated sulfuric acid storage tank (1) through a fifth communication valve (14), and is connected with the concentrated sulfuric acid buffer tank (2) through a seventh communication valve (16);
a sixth communication valve (15) is arranged on a concentrated sulfuric acid conveying pipeline between the concentrated sulfuric acid storage tank (1) and the concentrated sulfuric acid buffer tank (2), and one end of the concentrated sulfuric acid conveying pipeline extends to the bottom of the concentrated sulfuric acid storage tank (1) so as to prevent compressed air filled in the concentrated sulfuric acid storage tank (1) from entering the concentrated sulfuric acid conveying pipeline;
a third communicating valve (12) connected with air is arranged on the concentrated sulfuric acid buffer tank (2); an eighth communication valve (17) is arranged between the concentrated sulfuric acid buffer tank (2) and the acid preparation point;
the air compressor (6) and the air buffer tank (3) are connected and used for respectively and independently sending compressed air generated by the air compressor (6) to the concentrated sulfuric acid storage tank (1) and the concentrated sulfuric acid buffer tank (2) through the air buffer tank (3), so that a high-pressure environment is formed in the concentrated sulfuric acid storage tank (1) or the concentrated sulfuric acid buffer tank (2), and the concentrated sulfuric acid in the high-pressure environment is driven to flow to the next node communicated with the high-pressure environment;
a pressure reducing valve (20) is also arranged between the air compressor (6) and the air buffer tank (3) and is used for controlling the pressure of air entering the air buffer tank (3) to be kept stable;
the concentrated sulfuric acid buffer tank (2) is provided with a liquid level meter (7) for monitoring the concentrated sulfuric acid liquid level in the concentrated sulfuric acid buffer tank (2);
the air buffer tank (3) is provided with a safety valve (19) for timely discharging air in the air buffer tank (3);
a connecting pipeline between the concentrated sulfuric acid tank truck (8) and the concentrated sulfuric acid storage tank (1) extends into the bottom of the concentrated sulfuric acid storage tank (1), a buffer device is arranged at the bottom of the concentrated sulfuric acid storage tank (1), and the buffer device is a conical receiving pipe with a thick upper part and a thin lower part so as to reduce the impact of the concentrated sulfuric acid on the bottom of the concentrated sulfuric acid storage tank (1);
concentrated sulfuric acid storage tank (1) is placed underground and at the outer wall around the heat tracing coil pipe, prevents concentrated sulfuric acid low temperature crystallization influence and carries and use.
2. A concentrated sulfuric acid pneumatic conveying system according to claim 1, characterized in that a concentrated sulfuric acid storage tank pressure gauge (9) is arranged on the concentrated sulfuric acid storage tank (1) for monitoring the pressure in the concentrated sulfuric acid storage tank (1).
3. A concentrated sulfuric acid pneumatic conveying system according to claim 1, characterized in that the level gauge (7) is any one of a radar level gauge, a double flange level gauge, a float level gauge, a magnetic flap level gauge, a glass plate level gauge.
4. The concentrated sulfuric acid pneumatic conveying system according to claim 1, wherein the concentrated sulfuric acid conveying pipeline between the concentrated sulfuric acid tank car (8), the concentrated sulfuric acid storage tank (1), the concentrated sulfuric acid buffer tank (2) and the acid distribution point, which are connected in sequence, is made of carbon steel or titanium alloy with a lining, and the lining of the carbon steel is made of polytetrafluoroethylene or carbon fiber.
5. The concentrated sulfuric acid pneumatic conveying system of claim 1, wherein the concentrated sulfuric acid storage tank (1) is made of carbon steel, PVDF, HDPE or glass fiber reinforced plastic lined with polytetrafluoroethylene/carbon fiber.
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| JP2928819B2 (en) * | 1993-09-06 | 1999-08-03 | オルガノ株式会社 | Automatic pumping control device for hydrochloric acid fume gas from hydrochloric acid tank truck |
| JP3701181B2 (en) * | 2000-08-23 | 2005-09-28 | 旭サナック株式会社 | Multi-component mixed pressure feeder |
| CN202609903U (en) * | 2012-04-26 | 2012-12-19 | 天津达一琦精细化工有限公司 | Sulfuric acid pressure conveying system |
| CN203998922U (en) * | 2014-07-30 | 2014-12-10 | 西安龙源环保科技工程有限责任公司 | A kind of negative pressure of vacuum is unloaded sour device |
| CN105439066B (en) * | 2015-11-16 | 2017-11-10 | 聊城氟尔新材料科技有限公司 | A kind of anhydrous hydrofluoric acid unloading system |
| CN206985695U (en) * | 2017-07-28 | 2018-02-09 | 山东世纪阳光科技有限公司 | A kind of pigment production Vitriol tank-car unloading unit |
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