CN111878696A

CN111878696A - Low-temperature tank car

Info

Publication number: CN111878696A
Application number: CN202010800710.8A
Authority: CN
Inventors: 余军庆; 于海东; 肖学文; 张强; 刘志威
Original assignee: China International Marine Containers Group Co Ltd; CIMC Enric Investment Holdings Shenzhen Co Ltd; Jingmen Hongtu Special Aircraft Manufacturing Co Ltd
Current assignee: China International Marine Containers Group Co Ltd; CIMC Enric Investment Holdings Shenzhen Co Ltd; Jingmen Hongtu Special Aircraft Manufacturing Co Ltd
Priority date: 2020-08-11
Filing date: 2020-08-11
Publication date: 2020-11-03

Abstract

The invention relates to a low-temperature tank car, which comprises a storage tank, a vaporizer and a defrosting unit, wherein the vaporizer comprises a vaporizer body and a defrosting unit; the vaporizer is communicated with the storage tank; the defrosting unit comprises a high-pressure air source, a connecting pipe, a control valve and a purging pipe; the high-pressure gas source, the connecting pipe and the purging pipe are communicated in sequence; the control valve is arranged on the connecting pipe; the purging pipe is arranged close to the vaporizer, a plurality of airflow holes are formed in the purging pipe, and the airflow holes are arranged towards the vaporizer. The invention adds a defrosting unit on the vaporizer of the tank car; the purging pipe is arranged close to the vaporizer and matched with the airflow hole on the purging pipe, and the high-pressure gas provided by the high-pressure gas source is used for defrosting the vaporizer. When the surface of the vaporizer frosts due to long-time work, the control valve can be opened to blow the high-pressure gas in the high-pressure gas source to the vaporizer at high speed through the airflow hole, so that the frost covering the surface of the vaporizer is blown off, the defrosting function of the vaporizer is realized, and the vaporization effect of the vaporizer is effectively ensured.

Description

Low-temperature tank car

Technical Field

The invention relates to the technical field of industrial tank trucks, in particular to a low-temperature tank truck.

Background

Industrial gases (oxygen, nitrogen, argon, etc.) are likened to industrial "blood", an increasingly prominent position and role in the national economy. As the field of application downstream of the industrial gas industry continues to expand, the demand for industrial gases continues to increase. In order to meet the requirements of customers on multiple places, long distance and large consumption, the demand of the low-temperature industrial gas tank car as professional transportation equipment is steadily increased.

After the low-temperature industrial gas tank car is fully loaded with media and transported to a destination, a small amount of liquid in the tank car is vaporized into gas through a vaporizer carried by the tank car and is circulated into the tank car, so that the pressure in the tank car is increased. The medium in the tank is conveyed to the ground storage equipment through the pressure difference between the tank truck and the ground liquid receiving container.

In the related technology, the space of the tank car is limited, the matched vaporizer is generally small in size, after the vaporizer vaporizes liquid in the tank into gas for a long time, the surface of the vaporizer can be frosted in a large area, so that the vaporization efficiency of the liquid is reduced, the pressurization rate is reduced, the liquid discharging rate of the tank car is finally reduced, and the liquid discharging time of the whole tank car is greatly prolonged. Even when the carburetor is frosted seriously, the carburetor cannot work, and the tank truck cannot discharge liquid. The frosting phenomenon of the carburetor has great influence on the working efficiency of liquid discharging of the whole vehicle.

Disclosure of Invention

The invention aims to provide a low-temperature tank car to improve the defrosting effect of a vaporizer on the low-temperature tank car in the prior art and effectively ensure the vaporization effect of the vaporizer.

In order to solve the technical problems, the invention adopts the following technical scheme:

according to one aspect of the present invention, there is provided a cryogenic tanker comprising: a storage tank for storing low temperature industrial gas; the vaporizer is communicated with the storage tank and is used for vaporizing part of liquid in the storage tank into gas and conveying the gas back to the storage tank; the defrosting unit comprises a high-pressure air source, a connecting pipe, a control valve and a purging pipe; the high-pressure gas source, the connecting pipe and the purging pipe are communicated in sequence; the control valve is arranged on the connecting pipe and used for controlling the connection and disconnection of the connecting pipe; the purging pipe is arranged close to the vaporizer, and a plurality of airflow holes are formed in the purging pipe and face the vaporizer.

In some embodiments of the present application, the storage tank is used as the high-pressure air source, and the connecting pipe is communicated with the gas phase space in the storage tank.

In some embodiments of the present application, the high pressure gas source is a gas cylinder, and the gas cylinder is isolated from the storage tank; the connecting pipe is communicated with the gas storage bottle.

In some embodiments of the present application, the vaporizer comprises a plurality of parallel, spaced apart lengths of vaporization tubes; the purging pipes are distributed between the adjacent vaporizing pipes and extend and are distributed along the trend of the vaporizing pipes; the purging pipe is provided with corresponding airflow holes corresponding to each adjacent vaporizing pipe.

In some embodiments of the present application, the purge tube is parallel to the vaporization tube.

In some embodiments of the present application, the purge tube extends from one end of the vaporization tube to the other end of the vaporization tube.

In some embodiments of the present application, a plurality of the vaporization tubes are distributed in an array; the plurality of purging pipes are arranged, are respectively and correspondingly arranged in the array units of the vaporizing pipes and are surrounded by the vaporizing pipes.

In some embodiments of the present application, the plurality of purge pipes are connected to the connection pipe, respectively.

In some embodiments of the present application, the array unit of vaporization tubes comprises four adjacent vaporization tubes, the four adjacent vaporization tubes forming a rectangular structural distribution; the purging pipes are arranged among four adjacent vaporization pipes which are distributed in a rectangular shape, the airflow holes in the purging pipes are divided into four groups, and the four groups of airflow holes are distributed in one-to-one correspondence with the four adjacent vaporization pipes.

In some embodiments of the present application, four sets of the gas flow holes are evenly distributed around the circumference of the purge tube.

According to the technical scheme, the embodiment of the invention at least has the following advantages and positive effects:

in the low-temperature tank car provided by the embodiment of the invention, the vaporizer of the tank car is additionally provided with the defrosting unit, and the defrosting unit comprises a high-pressure air source, a control valve and a purging pipe. The purging pipe is arranged close to the vaporizer, an airflow hole facing the vaporizer is formed in the purging pipe, and the purging pipe is matched with a high-pressure gas source to provide high-pressure gas for the purging pipe. When the vaporizer frosts due to long-time operation, the control valve can be opened to blow the high-pressure gas in the high-pressure gas source to the vaporizer at high speed through the airflow hole, so that a frost layer or a frost block covering the surface of the vaporizer is blown off, the function of defrosting the vaporizer is realized, and the vaporization effect of the vaporizer is effectively ensured.

Drawings

FIG. 1 is a schematic system diagram of a tanker truck according to an embodiment of the present invention.

Figure 2 is a schematic system diagram of a tanker truck according to another embodiment of the present invention.

Fig. 3 is a schematic structural view of the vaporizer and the defrost unit of fig. 2 in a top view.

Fig. 4 is a side view schematic of fig. 3.

Fig. 5 is a sectional view a-a of fig. 3.

Fig. 6 is a schematic diagram of the structure of the matrix unit in fig. 5.

FIG. 7 is a schematic structural diagram of a purge tube according to an embodiment of the invention.

The reference numerals are explained below:

10. a storage tank;

11. an inner tank body; 12. an outer housing;

20. a liquid discharging unit;

21. a liquid discharge pipeline; 22. a first liquid outlet valve; 23. a second liquid outlet valve; 24. a liquid discharge port;

30. a vaporization pressurization unit;

31. a vaporizer; 32. a liquid inlet pipe; 33. a liquid inlet valve; 34. an air return pipe; 35. an air return valve;

310. an array unit; 311. a vaporization tube; 312. a tube inlet; 313. a tube outlet;

40. a defrosting unit;

41. a high pressure gas source; 42. a connecting pipe; 43. a control valve; 44. a purge tube;

441. and an airflow hole.

Detailed Description

Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Referring to fig. 1 to 7, the cryogenic tanker according to the embodiment of the present invention is used as a professional transportation facility for cryogenic industrial gas, including oxygen, nitrogen, argon, etc. The cryogenic tanker mainly comprises a storage tank 10, a liquid discharging unit 20, a vaporization pressurization unit 30 and a defrosting unit 40.

Referring to fig. 1 and 2, a storage tank 10 is shown as a storage and transportation vessel for industrial gas in which cryogenic industrial gas is stored. The low-temperature industrial gas may have a gas-liquid two-phase medium in the storage tank 10, the liquid-phase industrial medium is distributed in a lower portion of the storage tank 10, and the gas-phase industrial medium is distributed in an upper portion of the storage tank 10, so that the internal space of the storage tank 10 may be regarded as including a liquid-phase space in the lower portion and a gas-phase space in the upper portion.

Respective level and pressure detectors may be provided in the tank 10. The liquid level detector is used for detecting the liquid level height of the industrial medium in the liquid phase space, and the pressure detector is used for detecting the gas pressure of the industrial medium in the gas phase space.

Referring to fig. 1 and 2, in some embodiments, a storage tank 10 includes an inner tank 11 and an outer shell 12.

The inner tank body 11 is used for filling and storing low-temperature industrial gas.

The outer shell 12 is covered and sleeved on the outer side of the inner tank body 11, and a supporting structure can be arranged between the outer shell 12 and the inner tank body 11 to improve the overall structural strength and structural stability of the storage tank 10.

A heat insulation material can be filled between the outer shell 12 and the inner tank 11, or a vacuumizing mode is adopted, so that a heat insulation layer is formed between the outer shell 12 and the inner tank 11, and the heat insulation effect between the industrial gas in the inner tank 11 and the outside air is improved.

Referring to fig. 1 and 2, a liquid discharge unit 20 is used to discharge the liquid industrial medium in the tank 10 from the tank 10.

In some embodiments, the liquid discharging unit 20 mainly comprises a liquid discharging pipe 21 and an effluent valve disposed on the liquid discharging pipe 21.

One end of the liquid discharging pipeline 21 is communicated with the liquid phase space at the bottom in the storage tank 10. The connection between the end pipe orifice and the storage tank 10 can be arranged at the lowest position of the bottom surface of the storage tank 10, so that the liquid industrial medium in the storage tank 10 can be completely discharged from the storage tank 10 and enter the liquid discharge pipeline 21.

The other end of the liquid discharging pipeline 21 is provided with a liquid discharging port 24. The drain port 24 may be adapted to interface with an external, specific fluid receiving container, so that the liquid process medium entering the discharge conduit 21 may be discharged into the specific fluid receiving container via the drain port 24.

The liquid outlet valve is used for controlling the opening and closing of the liquid discharging pipeline 21.

When the specific external liquid receiving container is unloaded, the function of unloading the liquid from the storage tank 10 or filling the specific external liquid receiving container with industrial gas can be realized through controlling the liquid outlet valve.

In some embodiments, the tapping valves may comprise a first tapping valve 22 and a second tapping valve 23 connected in series to the tapping duct 21. The first liquid outlet valve 22 and the second liquid outlet valve 23 can adopt safety stop valves, namely, the cooperation of double safety stop valves is adopted, so that the liquid outlet safety and reliability are improved.

Referring to fig. 1 to 5, the vaporization and pressurization unit 30 is used to vaporize a part of the liquid industrial medium in the storage tank 10 into a gaseous industrial medium to increase the internal pressure of the storage tank 10.

The liquid discharging process of the tank truck mainly utilizes the internal pressure of the storage tank 10 to be higher than the pressure of an external liquid-bearing container. When the first liquid outlet valve 22 and the second liquid outlet valve 23 are opened, the pressure difference formed between the interior of the storage tank 10 and the liquid receiving container can transfer the liquid industrial medium in the storage tank 10 into the liquid receiving container through the liquid discharge pipe 21. Therefore, before the liquid discharging operation, the tank 10 needs to be pressurized by the vaporization pressurizing unit 30.

Referring to fig. 1 and 2, in some embodiments, the vaporization pressurization unit 30 may include a vaporizer 31, a liquid inlet pipe 32, a liquid inlet valve 33, a gas return pipe 34, and a gas return valve 35.

The liquid inlet end of the vaporizer 31 is communicated with the liquid phase space in the storage tank 10 through a liquid inlet pipe 32. The liquid inlet valve 33 is disposed on the liquid inlet pipe 32, and controls the on/off of the liquid inlet pipe 32. The outlet end of the vaporizer 31 is communicated with the gas phase space in the storage tank 10 through a gas return pipe 34. The air return valve 35 is arranged on the air return pipe 34 and controls the on-off of the air return pipe 34. Wherein, the liquid inlet valve 33 and the air return valve 35 can both adopt safety stop valves.

The working principle of the vaporizer 31 is to absorb the heat of the external atmosphere by means of heat exchange to realize the gasification function. The liquid industrial medium in the storage tank 10 enters the vaporizer 31 through the liquid inlet pipe 32 to be vaporized into a gaseous industrial medium, and the gaseous industrial medium returns to the gas phase space inside the storage tank 10 through the gas return pipe 34, so that the storage tank 10 is pressurized to increase the internal pressure of the storage tank 10. Therefore, the vaporization efficiency of the vaporizer 31 directly affects the pressurization efficiency of the tank 10, and thus the liquid discharge efficiency of the tank 10.

It should be noted that, in the process of vaporizing the liquid in the tank 10 into the gas by the vaporizer 31 for a long time, a large area of frost is formed on the surface of the vaporizer 31. The frosting can cause the internal and external heat exchange efficiency of the vaporizer 31 to be reduced, further the liquid vaporization efficiency is reduced, the pressurization rate of the storage tank 10 is reduced, and finally the liquid discharging rate of the tank car is reduced, so that the liquid discharging time of the tank car is prolonged.

Referring to fig. 3-5, in some embodiments, the vaporizer 31 may comprise a plurality of parallel, spaced-apart lengths of vaporization tubes 311.

The sections of vaporization tubes 311 may be connected in series, parallel, or a combination thereof, such that the vaporizer 31 has a tube inlet 312 at one end and a tube outlet 313 at the other end. The tube inlet 312 is connected to the liquid inlet tube 32. Tube outlet 313 is connected to muffler 34.

In some embodiments, the plurality of vaporization tubes 311 may also be arranged in an array. Each array unit 310 may include a plurality of vaporization tubes 311.

For example, the array unit 310 may employ four vaporization tubes 311 distributed in a rectangular structure when viewed in cross section of the vaporization tubes 311, the vaporization tubes 311 being arranged at the top corners of the rectangular structure. Similarly, the array unit 310 may also adopt three vaporization tubes 311 distributed in a regular triangle structure, or adopt five vaporization tubes 311 distributed in a regular pentagon structure, etc.

Referring to fig. 1 to 5, the defrost unit 40 includes a high pressure gas source 41, a connection pipe 42, a control valve 43, and a purge pipe 44.

Referring to fig. 1 and 2, a high pressure gas source 41 is connected to a purge pipe 44 through a connection pipe 42 for supplying high pressure gas to the purge pipe 44.

In some embodiments, the pressurized gas source 41 may be mounted on the tank car using a separate high pressure gas cylinder. Or a high-pressure gas storage bottle attached to the brake system of the tank car is used as the high-pressure gas source 41. The gas storage cylinder is isolated from the storage tank 10, and the connecting pipe 42 is communicated with the gas storage cylinder.

In some embodiments, the tank 10 may be used directly as the high pressure gas source 41. The connection pipe 42 communicates with the gas phase space inside the storage tank 10.

Referring to fig. 4, a control valve 43 is installed on the connection pipe 42 for controlling the connection and disconnection of the connection pipe 42.

When the control valve 43 is opened, the gas-phase industrial gas in the storage tank 10 can directly supply high-pressure gas to the purge pipe 44 through the connection pipe 42.

In some embodiments, the control valve 43 may be a manually controlled shut-off valve. In the long-time liquid discharging process, when the operator observes that the defrosting phenomenon of the vaporizer 31 is obvious, the operator can directly and manually open the control valve 43 to defrost, and then manually close the control valve 43 after defrosting is finished.

Referring to fig. 1 to 7, the purge pipe 44 is disposed near the vaporizer 31. The purge pipe 44 is provided with a plurality of airflow holes 441, and each airflow hole 441 is arranged towards the vaporizer 31.

When the control valve 43 is opened, the high-pressure gas supplied from the high-pressure gas source 41 is delivered to the purge pipe 44 through the connection pipe 42, and is blown to the vaporizer 31 at a high speed through the gas flow holes 441 of the purge pipe 44, so that the frost layer or frost cake condensed on the surface of the vaporizer 31 is blown off, thereby achieving a defrosting function.

Referring to fig. 3 and 4, in some embodiments, the purge tube 44 extends along the length of the vaporization tubes 311 and is disposed between adjacent vaporization tubes 311. In some embodiments, the purge tube 44 may be arranged in parallel with the vaporization tube 311.

The purge pipe 44 is provided with a corresponding gas flow hole 441 corresponding to each adjacent vaporization pipe 311. The high-speed air flow can be simultaneously blown to the adjacent vaporization tubes 311 by the purge tube 44 while performing the defrosting operation, so that the defrosting efficiency of the vaporizer 31 and the utilization efficiency of the high-pressure gas can be improved.

In some embodiments, when the purge tube 44 is disposed between adjacent vaporization tubes 311, the purge tube 44 may extend from one end of the adjacent vaporization tube 311 to the other end of the vaporization tube 311.

Referring to fig. 7, in some embodiments, a plurality of gas flow holes 441 are arranged on the purge pipe 44 in a straight line along an extending direction of the purge pipe 44, as viewed from an axial direction of the purge pipe 44. The plurality of air flow holes 441 distributed along the direction of the purge pipe 44 form a set of air flow holes 441, and the set of air flow holes 441 can completely and sufficiently perform the defrosting operation on the entire section of the adjacent vaporizing pipe 311.

Referring to fig. 5 and 6, in some embodiments, the purge pipe 44 is provided in plurality, and the plurality of purge pipes 44 are arranged in one-to-one correspondence with the array units 310 of the plurality of vaporization pipes 311. To further improve the defrosting efficiency of the vaporizer 31 and to further improve the utilization efficiency of the high-pressure gas.

The purge pipe 44 is disposed to extend into the array unit 310 of the vaporization pipe 311, and may be located at the center of the array unit 310. The defrosting operation is simultaneously performed for each vaporization tube 311 in the array unit 310 through the purge tube 44 at the center.

The air flow holes 441 on the purge pipe 44 may be divided into a plurality of groups, as viewed from the circumferential direction of the purge pipe 44, and each group of the air flow holes 441 correspondingly blows toward a vaporizing pipe 311 in the array unit 310.

For example, when the array unit 310 of the vaporization tubes 311 is four adjacent vaporization tubes 311 distributed in a rectangular structure, the purge tube 44 is arranged at the center of the rectangular structure, four sets of gas flow holes 441 are arranged on the circumferential direction of the purge tube 44, the four sets of gas flow holes 441 are uniformly distributed on the purge tube 44 around the circumference, and the four sets of gas flow holes 441 are distributed in one-to-one correspondence with the four adjacent vaporization tubes 311 in the array unit 310.

Referring to fig. 3 to 6, in some embodiments, the pipe diameter of the purge pipe 44 is set to be small, and the pipe diameter of the purge pipe 44 is smaller than that of the vaporization pipe 311. So as to maintain the high pressure and the flow speed of the air flow of the purging pipe 44, save the use of the high-pressure gas, and further improve the utilization efficiency of the high-pressure gas.

Based on the technical scheme, the embodiment of the invention at least has the following advantages and positive effects:

in the low-temperature tank truck of the embodiment of the invention, a defrosting unit 40 is additionally arranged on a vaporizer 31 of the tank truck, and the defrosting unit 40 comprises a high-pressure air source 41, a control valve 43 and a purging pipe 44. The purge tube 44 is disposed close to the vaporizer 31, and the purge tube 44 is provided with an airflow hole 441 facing the vaporizer 31 and is matched with the high-pressure gas source 41 to provide high-pressure gas to the purge tube 44. When the vaporizer 31 is frosted due to long-term operation, the control valve 43 can be opened to blow the high-pressure gas in the high-pressure gas source 41 to the vaporizer 31 through the airflow hole 441 at a high speed, so as to blow off the frost layer or frost block covering the surface of the vaporizer 31, thereby realizing the function of defrosting the vaporizer 31 and further effectively ensuring the vaporization effect of the vaporizer 31.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. A cryogenic tanker, characterized in that it comprises:

a storage tank for storing low temperature industrial gas;

the vaporizer is communicated with the storage tank and is used for vaporizing part of liquid in the storage tank into gas and conveying the gas back to the storage tank; and

the defrosting unit comprises a high-pressure air source, a connecting pipe, a control valve and a purging pipe; the high-pressure gas source, the connecting pipe and the purging pipe are communicated in sequence; the control valve is arranged on the connecting pipe and used for controlling the connection and disconnection of the connecting pipe; the purging pipe is arranged close to the vaporizer, and a plurality of airflow holes are formed in the purging pipe and face the vaporizer.

2. The cryogenic tank car of claim 1, wherein the storage tank serves as the source of high pressure gas and the connecting pipe communicates with a gas phase space within the storage tank.

3. The cryogenic tanker according to claim 1, wherein the high pressure gas source is a gas cylinder, said gas cylinder being isolated from said storage tank;

the connecting pipe is communicated with the gas storage bottle.

4. The cryogenic tanker according to claim 1, wherein the vaporizer comprises a plurality of parallel spaced apart vaporization tubes;

the purging pipes are distributed between the adjacent vaporizing pipes, and extend along the length direction of the vaporizing pipes;

the purging pipe is provided with corresponding airflow holes corresponding to each adjacent vaporizing pipe.

5. The cryogenic tanker according to claim 4, wherein the purge pipe is parallel to the boil-off pipe.

6. The cryogenic tanker according to claim 4, wherein the purge pipe extends from one end of the boil-off pipe to the other end of the boil-off pipe.

7. The cryogenic tanker according to claim 4, wherein a plurality of said vaporization tubes are distributed in an array;

the plurality of purging pipes are arranged, are respectively and correspondingly arranged in the array units of the vaporizing pipes and are surrounded by the vaporizing pipes.

8. The cryogenic tanker according to claim 7, wherein a plurality of said purge pipes are connected to said connecting pipes, respectively.

9. The cryogenic tanker according to claim 7, wherein the array unit of vaporization tubes comprises four adjacent vaporization tubes, which form a rectangular structural distribution;

the purging pipes are arranged among four adjacent vaporization pipes which are distributed in a rectangular shape, the airflow holes in the purging pipes are divided into four groups, and the four groups of airflow holes are distributed in one-to-one correspondence with the four adjacent vaporization pipes.

10. The cryogenic tanker according to claim 9, wherein four sets of said gas flow holes are evenly distributed circumferentially on said purge tube.