A detection device for detecting the sinking of perlite under a low-temperature liquid storage tank and a detection method thereof

Abstract

The application discloses a detection equipment for low-temperature liquid storage tank pearlite sinking and a detection method thereof. The equipment comprises a storage tank, an opening I is formed in the top of the storage tank, an air inlet pipeline is arranged in the storage tank and is mounted in the opening I, a gas injection mechanism is mounted at the input end of the air inlet pipeline, a horizontal mechanism is fixedly connected to the output end of the air inlet pipeline, and a bordering mechanism is arranged at the output end of the horizontal mechanism. Compared with the traditional detection method, the pearlite filling opening does not need to be opened, the flammable and explosive medium is prevented from being discharged into the atmosphere, the air and moisture are prevented from entering the tank, the cost is reduced, the safety guarantee is improved, the driving force generated by the nitrogen gas with pressure is utilized to transport the pearlite above the lowest height line of the pearlite to the outside, if the overflowed pearlite is detected at the outlet, the height of the pearlite meets the cold preservation height of the storage tank, otherwise, the pearlite needs to be filled.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of low-temperature medium storage tanks, and particularly relates to a detection device for sintered perlite sinking of a low-temperature liquid storage tank and a detection method thereof. BACKGROUND

[0002] Sintered perlite is a kind of white, granular and loose material with a porous structure, which is made of acid volcanic glass lava through crushing, preheating and roasting expansion. It has the characteristics of small capacity, low thermal conductivity, good chemical stability, non-combustible, non-toxic, odorless and sound absorption.

[0003] Absolute cooling is the main means for low-temperature storage tanks to ensure the storage of low-temperature medium. At present, the heat insulation mode of the annular space between the outer tank and the inner tank of the low-temperature storage tank on the market is to fill sintered perlite. The sintered perlite filled in the annular space has good cooling effect and can prevent cold air from being transmitted to the outer tank. However, during precooling and operation, the shrinkage of the inner tank and the outer tank causes the sintered perlite to sink. When the sintered perlite sinks to the vicinity below the sealing of the ceiling end, the cold air in the inner tank will be transmitted to the outer tank wall and the compression ring and freeze in the presence of water, causing the metal storage tank or the concrete to be at an extremely low temperature, which will cause safety accidents in the long term. Therefore, it is necessary to detect the sinking of sintered perlite at irregular intervals after precooling and during operation. For flammable and explosive low-temperature medium that is not easy to discharge, the detection of sintered perlite sinking is a very difficult problem. According to the actual application of the market, there is the following detection method for sintered perlite sinking:

[0004] A measuring tool (a measuring rod or a pipe tool) is used to open the sintered perlite filling port and detect the sinking height of the sintered perlite in the annular space of the tank. This method is simple and flexible, but has the following disadvantages:

[0005] 1. The sintered perlite filling port needs to be frequently opened and closed, causing the gasket and bolts to be worn out and needing to be replaced frequently.

[0006] 2. When the sintered perlite filling port is opened, the medium in the flammable and explosive atmosphere in the tank that is not easy to discharge will be discharged, which will cause safety accidents or environmental pollution when encountering a fire source.

[0007] 3. Air enters the tank, causing the air to mix with the medium, which poses a safety risk.

[0008] 4. Moisture in the environment enters the tank, causing condensation inside the storage tank, which requires the tank to be stopped and dried in severe cases. SUMMARY

[0009] In view of the above defects, the present application provides a kind of for low temperature liquid storage tank pearlite sinking detection equipment, including storage tank, the top of the storage tank is provided with opening I, the inside of opening I is installed in the inside of storage tank air inlet pipeline, the input end of air inlet pipeline is equipped with gas injection mechanism, the output end of air inlet pipeline is fixedly connected with horizontal mechanism, the outside of the output end of horizontal mechanism is equipped with edge covering mechanism, the top of the storage tank is provided with opening II with horizontal mechanism in the same vertical line, the inside of opening II is equipped with pearlite outlet pipeline, the top of pearlite outlet pipeline extends to the top of storage tank and is equipped with flange group, opening III is formed in the place of flange group and is connected with short pipe, the short pipe is connected with inspection pipeline by valve.

[0010] Further, the gas injection mechanism includes a gas injection pipe connected to the air inlet pipeline, a stop valve is installed between the gas injection pipe and the air inlet pipeline, a pressure reducing valve and a pressure gauge are installed at the gas injection pipe, and the input end of the gas injection pipe is connected to a dry nitrogen source.

[0011] Further, the bottom end of the air inlet pipeline is lower than the lowest height line of the pearlite filled in the inside of the storage tank.

[0012] Further, the horizontal mechanism includes a U-shaped pipe connected to the output end of the air inlet pipeline, the output end of the U-shaped pipe is horizontal and in the same vertical line with the pearlite outlet pipeline, and the pearlite outlet pipeline is fixed to the outside of the U-shaped pipe by a section steel.

[0013] Further, the edge covering mechanism includes a phosphor copper wire mesh installed on the outlet end of the air inlet pipeline, and is wrapped with three layers of glass silk cloth on the outer surface of the air inlet pipeline, and the outer ring is tightened with a quick tightening clamp.

[0014] Further, the flange group includes a flange and a flange cover for plugging.

[0015] Further, the inspection pipeline includes a 90° elbow pipe connected to the short pipe, and a valve is installed between the short pipe and the elbow pipe, and the opening end of the elbow pipe faces outward.

[0016] Further, the number of the low temperature liquid storage tank pearlite sinking detection equipment is not less than four, and is distributed in an equidistant ring array.

[0017] Further, the present application also discloses a kind of for low temperature liquid storage tank pearlite sinking detection method, including the above-mentioned low temperature liquid storage tank pearlite sinking detection equipment, further comprising the following steps:

[0018] S1, preparation stage: the inside of the storage tank is filled with an appropriate amount of pearlescent sand to be tested, the gas injection mechanism is turned on, the nitrogen pressure is ensured to be not greater than 0.1Mpa, and the gas inlet pipeline, the horizontal mechanism, the pearlescent sand outlet pipeline and the inspection pipeline are in a smooth state;

[0019] S2, gas injection stage: 0.1MPa dry nitrogen is injected from the gas injection mechanism, passes through the gas inlet pipeline and the horizontal mechanism in sequence, and the pearlescent sand accumulated between the horizontal mechanism and the pearlescent sand outlet pipeline is pushed upwards by the airflow to enter the inside of the pearlescent sand outlet pipeline until it is discharged through the inspection pipeline;

[0020] S3, detection stage: the detection result of the pearlescent sand discharged from the inspection pipeline in the above step S2 is determined:

[0021] Result A: a large amount of pearlescent sand overflows, indicating that the height of the pearlescent sand meets the cold preservation requirement and does not need to be filled with sand;

[0022] Result B: a small amount of pearlescent sand overflows and gradually decreases to zero, and sand needs to be supplemented.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] 1. The driving force generated by the pressurized nitrogen is used to transport the pearlescent sand above the lowest height line of the pearlescent sand to the outside. If the overflowed pearlescent sand can be detected at the outlet, the height of the pearlescent sand meets the cold preservation height of the storage tank, otherwise, the pearlescent sand needs to be filled;

[0025] 2. Compared with the traditional detection method, the pearlescent sand filling port does not need to be opened, preventing flammable and explosive media from being discharged into the atmosphere, avoiding air and moisture from entering the tank, not only reducing the cost, but also improving the safety guarantee, which is a safe and reliable detection method. It is suitable for all low-temperature media with boiling points of 0-165℃ and needs to be filled with pearlescent sand in low-temperature suspended ceiling metal and concrete. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a sectional view of the storage tank in the present application.

[0027] Figure 2 It is Figure 1 an enlarged schematic view of position A in the present application.

[0028] Figure 3 It is a distribution schematic view of opening I and opening II in the present application.

[0029] Figure 4 It is an enlarged schematic view of the edge covering mechanism in the present application.

[0030] In the figure: 1, storage tank; 2, air inlet pipeline; 3, edge covering mechanism; 31, phosphor copper wire mesh; 32, three-layer glass silk cloth package; 33, quick loose throat clamp; 4, pearl sand outlet pipeline; 5, flange group; 6, short pipe; 71, gas injection pipe; 72, stop valve; 73, pressure reducing valve; 74, pressure gauge; 8, profile steel; 9-1, radial beam; 9-2, suspender; 9-3, suspended ceiling; 9-4, end reinforcing ring; 9-5, main container cylinder wall; 9-6, elastic felt; 9-8, pearl sand; 9-9, prestressed concrete. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present application, the device of the present application will be described more fully below with reference to the accompanying drawings. Embodiments of the device are shown in the drawings. However, the device can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0032] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "arrangement" should be understood broadly, for example, it can be fixedly connected, arranged, or detachably connected, arranged, or integrally connected, arranged. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] EMBODIMENT

[0034] As Figures 1-2 shown, the present embodiment provides a detection device for the sinking of pearl sand of a low-temperature liquid storage tank, which comprises a storage tank 1 (diameter 68.4 meters, volume 100000 m 3 The top of the storage tank 1 is provided with an opening I, and an air inlet pipeline 2 (a pipeline with a specification of DN50 can be used) located inside the storage tank 1 is mounted in the inside of the opening I. The input end of the air inlet pipeline 2 is provided with a gas injection mechanism, which comprises a gas injection pipe 71 in communication with the air inlet pipeline 2. The gas injection pipe 71 and the air inlet pipeline 2 are provided with a stop valve 72 therebetween. The gas injection pipe 71 is provided with a pressure reducing valve 73 and a pressure gauge 74. The input end of the gas injection pipe 71 is in communication with a dry nitrogen source, which is used for detecting and controlling the inlet pressure and ensuring that the inlet pressure is not greater than 0.1 MPa. The bottom end of the air inlet pipeline 2 is lower than the lowest height line of the pearl sand 9-8 filled in the inside of the storage tank 1, so as to ensure that the pearl sand 9-8 can be lifted up by subsequent gas injection.

[0035] The output end of the air inlet pipeline 2 is fixedly communicated with a horizontal mechanism, which comprises a U-shaped pipe communicated with the output end of the air inlet pipeline 2, the output end of the U-shaped pipe is horizontally arranged and located on the same vertical line as the pearlite outlet pipeline 4, (a straight pipe can also be used in combination with an elbow pipe, which will not be described in detail here, and the output direction can be changed as long as it is located on the same vertical line as the pearlite outlet pipeline 4), and the pearlite outlet pipeline 4 is fixed to the outer side of the U-shaped pipe through a section steel 8, and the section steel 8 and the pearlite outlet pipeline 4 and the U-shaped pipe are reinforced by a welded steel plate to ensure that the air inlet pipeline 2 does not shake and that the output end of the U-shaped pipe is located on the same vertical line as the pearlite outlet pipeline 4.

[0036] As shown in the accompanying drawings, Figure 4 The output end of the horizontal mechanism is externally provided with a beading mechanism 3, which comprises a phosphor bronze wire mesh 31 mounted on the outlet end of the air inlet pipeline 2, and is wrapped on the outer surface of the air inlet pipeline 2 through three layers of glass silk cloth 32, and the outer ring is tightened with a quick tension clamp 33 to prevent the pearlite 9-8 from entering the air inlet pipeline 2.

[0037] A hole II is formed in the top of the storage tank 1 and located on the same vertical line as the horizontal mechanism, and the pearlite outlet pipeline 4 is mounted in the hole II (a pipeline with a specification of DN100 can be used, and the distance from the lowest height line of the pearlite is 1350mm), the top of the pearlite outlet pipeline 4 extends through the storage tank 1 to the top thereof and is provided with a flange group 5, the flange group 5 comprises a flange and a flange cover for plugging. An opening III (i.e. formed in the flange cover) is formed in the flange group 5 and is communicated with a short pipe 6 (a pipeline with a specification of DN125 can be used), the short pipe 6 is communicated with an inspection pipeline through a valve, the inspection pipeline comprises a 90° elbow pipe communicated with the short pipe 6, and a valve is mounted between the short pipe 6 and the elbow pipe, the opening end of the elbow pipe faces outward, which is convenient for workers to observe the pearlite 9-8 flowing out;

[0038] Also described is a detection method for the sinking of pearlite in a low-temperature liquid storage tank, comprising the detection device for the sinking of pearlite in a low-temperature liquid storage tank, and further comprising the following steps:

[0039] S1, preparation stage: the inside of the storage tank 1 is filled with an appropriate amount of pearlite 9-8 to be tested, the gas injection mechanism is turned on, the nitrogen pressure is ensured to be not greater than 0.1Mpa, and the air inlet pipeline 2, the horizontal mechanism, the pearlite outlet pipeline 4 and the inspection pipeline are in an unobstructed state;

[0040] S2, gas injection stage: 0.1MPa dry nitrogen is injected from the gas injection mechanism, passes through the air inlet pipeline 2 and the horizontal mechanism in sequence, and the pearlite 9-8 accumulated between the horizontal mechanism and the pearlite outlet pipeline 4 is pushed upward by the airflow to enter the inside of the pearlite outlet pipeline 4, until it is discharged through the inspection pipeline;

[0041] S3, detection stage: determine the detection result according to the pearlite 9-8 overflowing from the inspection pipeline in step S2 above:

[0042] Result A: a large amount of pearlite 9-8 overflows, indicating that the height of the pearlite 9-8 meets the cold preservation requirement, so that sand filling is not required;

[0043] Result B: a small amount of pearlite 9-8 overflows, and gradually reduces to none, so that sand filling operation is required.

[0044] It should be noted that the number of detection devices for the pearlite sinking of the low-temperature liquid storage tank is not less than four, and is distributed in an equidistant annular array, such as being distributed in the directions of 0°, 90°, 180° and 270°, as shown in the accompanying drawings, and the number can be increased as required to realize observation at multiple angles, so that the pearlite sinking can be accurately detected. Figure 3

[0045] It should be noted that the lowest height line of the pearlite 9-8 filled in the storage tank 1 is indicated by the reference sign b in the accompanying drawings of FIGS. 9-1, 9-2, 9-3, 9-4, 9-5, 9-6, 9-7 and 9-8, and in FIG. 9-1, 9-1 is a radial beam, 9-2 is a suspender, 9-3 is a suspended ceiling, 9-4 is an end reinforcing ring, 9-5 is a main container cylinder wall, 9-6 is elastic felt, 9-8 is pearlite, and 9-9 is prestressed concrete. Figure 1 Figure 2 Figure 2

[0046] It should be noted that the structure described in the present application can be implemented in various different forms, and is not limited to the described embodiments, and any equivalent transformation made by those skilled in the art using the contents of the specification and drawings, or direct or indirect application in other related technical fields, such as loading and unloading of other articles, are all included in the protection scope of the present application.​​​​

Claims

1. A detection apparatus for detecting the settling of perlite under a cryogenic liquid storage tank, comprising a tank, characterized in that: The top of the storage tank is provided with an opening I, an air inlet pipe is arranged in the opening I, an air injection mechanism is arranged at the input end of the air inlet pipe, the bottom end of the air inlet pipe is lower than the lowest height line of the pearlite filled in the storage tank, a horizontal mechanism is fixedly connected to the output end of the air inlet pipe, the horizontal mechanism comprises a U-shaped pipe connected to the output end of the air inlet pipe, the output end of the U-shaped pipe is horizontal and located on the same vertical line with a pearlite outlet pipeline, the pearlite outlet pipeline is fixed to the outside of the U-shaped pipe by a section steel, a covering mechanism is arranged outside the output end of the horizontal mechanism, the top of the storage tank is provided with an opening II located on the same vertical line with the horizontal mechanism, the pearlite outlet pipeline is arranged in the opening II, the top of the pearlite outlet pipeline extends through the storage tank to the top of the storage tank and is provided with a flange group, an opening III is arranged in the flange group and is connected with a short pipe, the short pipe is connected with an inspection pipe through a valve.

2. A detection device for detecting the sinking of perlite under a cryogenic liquid storage tank as claimed in claim 1, characterized in that: The air injection mechanism comprises an air injection pipe connected to the air inlet pipe, a stop valve is arranged between the air injection pipe and the air inlet pipe, a pressure reducing valve and a pressure gauge are arranged on the air injection pipe, and the input end of the air injection pipe is connected to a dry nitrogen source.

3. A detection apparatus for detecting the sinking of perlite under a cryogenic liquid storage tank as claimed in claim 1, wherein: The covering mechanism comprises a phosphor copper wire mesh arranged on the outlet end of the air inlet pipe and wrapped by three layers of glass silk cloth on the outer surface of the air inlet pipe, and the outer ring is tightened by a quick loose clamp.

4. A detection apparatus for detecting the sinking of perlite under a cryogenic liquid storage tank as claimed in claim 1, wherein: The flange group comprises a flange and a flange cover for plugging.

5. A detection apparatus for detecting the sinking of perlite under a cryogenic liquid storage tank as claimed in claim 4, wherein: The inspection pipe comprises a 90° elbow pipe connected to the short pipe, a valve is arranged between the short pipe and the elbow pipe, and the opening end of the elbow pipe faces outward.

6. A detection apparatus for detecting the sinking of perlite under a cryogenic liquid storage tank as defined in claim 1, wherein: The number of the detection equipment for the pearlite sinking of the low-temperature liquid storage tank is not less than four, and the detection equipment is arranged in an equidistant annular array.

7. A method for detecting the settling of perlite in cryogenic liquid storage tanks, characterized in that: The detection equipment for the pearlite sinking of the low-temperature liquid storage tank according to any one of claims 1-6 further comprises the following steps: S1, preparation stage: the inside of the storage tank is filled with an appropriate amount of pearlite to be tested, the air injection mechanism is turned on, the nitrogen pressure is ensured to be not greater than 0.1 Mpa, and the air inlet pipe, the horizontal mechanism, the pearlite outlet pipeline and the inspection pipe are in an unobstructed state; S2, air injection stage: 0.1 MPa dry nitrogen is injected from the air injection mechanism, passes through the air inlet pipe and the horizontal mechanism in sequence, and the pearlite accumulated between the horizontal mechanism and the pearlite outlet pipeline is pushed upward by the airflow to enter the inside of the pearlite outlet pipeline until it is discharged through the inspection pipe; S3, detection stage: the pearlite discharged through the inspection pipe in the step S2 is determined as the detection result: Result A: a large amount of pearlite overflow, indicating that the height of the pearlite meets the cold preservation requirement and no sand needs to be filled; Result B: a small amount of pearlite overflow, which gradually decreases to zero, and sand needs to be supplemented.

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