CN-122014985-A - Low-temperature storage tank gas jacking sealing device and low-temperature storage tank gas jacking construction method

CN122014985ACN 122014985 ACN122014985 ACN 122014985ACN-122014985-A

Abstract

The invention discloses a low-temperature storage tank gas jacking sealing device and a low-temperature storage tank gas jacking construction method, which relate to the technical field of LNG low-temperature storage tank construction, and are characterized in that a sealing mechanism and a plurality of lifting mechanisms are arranged, in the vault lifting stage (namely the longest and most critical construction period), the sealing mechanism is in a state of being separated from walking and maintains a continuous isolation gas ring, and no solid contact part exists between the vault and the inner wall of the tank body at the moment, so that continuous sliding friction generated between the traditional rigid sealing strip, the brush seal or the rubber scraper and the tank wall in the long-distance climbing process is completely eliminated. The friction is eliminated, so that the sealing structure is directly prevented from being damaged by repeated scraping and grinding to generate serious abrasion, tearing, falling blocks and the like, and scratches, local cold work hardening, microcrack sources and other damages caused by long-term hard friction on the surface of the 9% Ni steel on the inner wall of the tank body are also avoided, and the integrity and the service life of the final inner wall surface of the tank body are obviously improved.

Inventors

LIU TIANJUN
ZHANG WEI
ZHANG YINQIANG
XU BINGBING
HUANG YONGQING
PAN YONG
ZHANG YUKUN
SHI XUEWEN
LIU JIGONG

Assignees

中国建筑第二工程局有限公司
中建电力工程(深圳)有限公司

Dates

Publication Date: 20260512
Application Date: 20260319

Claims (10)

1. The utility model provides a low temperature storage tank gas jacking sealing device, the low temperature storage tank include jar body and make in the vault in the jar, the vault is located the bottom of the jar body, the vault with be formed with between the jar body and store gaseous gas storage space for the jacking, gas storage space intercommunication is provided with the air pump, the air pump can be towards pump in the gas storage space gas in order to with the vault follow the bottom gas jacking of the jar body is located to the lid the top of the jar body is located, in order with the jar body encloses and forms the low temperature storage tank, its characterized in that, gas jacking sealing device includes: A sealing mechanism which is arranged around the periphery of the vault and has an abutting sealing state and a disengaging walking state, wherein in the abutting sealing state, the sealing mechanism can be abutted against the inner wall of the tank body and enables the vault to suspend in the tank body, in the disengaging walking state, the sealing mechanism can spray air flow towards the direction of the air storage space so as to be opposite to the air flow in the air storage space and form an isolating air ring, and The lifting mechanisms are distributed on the inner wall of the tank body at intervals along the circumferential direction, all the lifting mechanisms are located above the vault, all the lifting mechanisms are connected with the vault, all the lifting mechanisms can drive the vault to climb along the inner wall of the tank body when the sealing mechanism is in a separation walking state, and all the lifting mechanisms can also enable the vault to suspend in the tank body when the sealing mechanism is in the sealing state.
2. The cryogenic tank air lift seal of claim 1, wherein the seal mechanism comprises: the connecting ring is arranged on the periphery of the vault in a surrounding mode, and an annular mounting position is formed on the connecting ring in a surrounding mode; The sealing component is arranged at the mounting position and surrounds the periphery of the connecting ring, an air cavity is formed in the sealing component, a plurality of air holes communicated with the air cavity are formed in the sealing component, the air holes are distributed at intervals along the circumferential direction and communicated with the lifting mechanism through an air pipe, so that the air cavity can be switched between an inflated state and a deflated state, and the sealing component can be abutted against the inner wall of the tank body and form an abutting sealing state when the air cavity is in the inflated state, and The isolation gas ring forming component is arranged on the connecting ring, the isolation gas ring forming component is positioned below the sealing component, a gas ring forming cavity is formed in the isolation gas ring forming component, and the gas ring forming cavity is communicated with the lifting mechanism through a pipeline; The isolating gas ring forming member is capable of ejecting a gas flow from within the gas ring forming chamber and forming the isolating gas ring when the sealing member is in the deflated state.
3. The low-temperature storage tank air jacking sealing device according to claim 2, wherein the sealing component comprises a wear-resistant layer, a tearing-resistant layer, an airtight barrier layer, a buffer layer and an air storage layer which are sleeved in sequence from outside to inside, the wear-resistant layer is connected with the installation position, the air cavity is formed in the air storage layer, and the air holes sequentially penetrate through the wear-resistant layer, the tearing-resistant layer, the airtight barrier layer, the buffer layer and the air storage layer from outside to inside.
4. The cryogenic tank air lift seal of claim 3, wherein the connecting ring has a circumferentially disposed clamping groove formed therein, at least a portion of the wear layer being clamped within the clamping groove.
5. The cryogenic tank air lift seal of claim 4, wherein the isolation air ring forming means comprises an integrally formed base ring, a first blocker ring, and a second blocker ring, the first blocker ring being positioned above the second blocker ring, the air ring forming chamber being formed between the base ring, the first blocker ring, and the second blocker ring, the air ring forming chamber being formed with an annular air passage disposed toward an inner wall of the tank.
6. The cryogenic tank air lift seal of claim 5, wherein the first blocker ring is positioned radially downwardly sloping on a side of the air ring forming chamber and the second blocker ring is positioned radially upwardly sloping on a side of the air ring forming chamber to radially taper the air ring forming chamber.
7. The cryogenic tank air lift seal of claim 6 wherein the diameter of the second blocker ring is less than the diameter of the first blocker ring.
8. The cryogenic tank air lift seal of any one of claims 1 to 7, wherein the lift mechanism comprises: at least one guide rail vertically arranged on the inner wall of the tank body; The fixing seats are vertically distributed at two ends of the guide rail at intervals, and all the fixing seats are connected to the inner wall of the tank body; A slider slidably engaged with the guide assembly, and The lifting cylinder is arranged on the sliding block, the telescopic end of the lifting cylinder is connected with the vault, and the lifting cylinder is communicated with the sealing mechanism through a pipeline.
9. The cryogenic tank air lift seal of claim 8, wherein the guide rail is formed with vertically spaced apart abutment grooves, and the slider is further rotatably provided with abutment blocks that can abut in any of the abutment grooves.
10. A method of cryogenic tank gas jacking construction, characterized in that the cryogenic tank gas jacking seal device according to any one of claims 1 to 9 is applied, the construction method comprising the steps of: Mounting the sealing mechanism to the outer periphery of the dome that has been made; ejecting a first air flow into the air storage space at a preset speed through the sealing mechanism; ejecting a second air flow into the air storage space through the air pump; Forming the isolating gas ring when the first gas flow meets the first gas flow at the preset speed; And continuously pumping the second air flow into the air storage space through the air pump so as to push the vault to rise along the inner wall of the tank body and perform air jacking construction.

Description

Low-temperature storage tank gas jacking sealing device and low-temperature storage tank gas jacking construction method Technical Field The invention relates to the technical field of LNG low-temperature storage tank construction, in particular to a low-temperature storage tank gas jacking sealing device and a low-temperature storage tank gas jacking construction method. Background LNG cryogenic tanks are the primary equipment for storing large amounts of LNG natural gas, and in the prior art, when LGN cryogenic tank construction is performed, the dome is usually lifted to a design height by means of air lift. However, currently, in the process of performing gas jacking construction, a sealing structure needs to be provided between the dome and the tank wall to avoid leakage of gas jacking the dome. The common sealing device is directly installed at the edge position of the dome and is attached to the tank wall, so that the sealing function is achieved, although the sealing effect between the dome and the tank wall can be ensured by using the method, friction can occur between the sealing device and the tank wall in the actual jacking process, the sealing device is damaged, and the service life of the tank wall is finally affected. Disclosure of Invention The invention mainly aims to provide a low-temperature storage tank gas jacking sealing device and a low-temperature storage tank gas jacking construction method, and aims to solve the technical problem that in the prior art, friction occurs between the sealing device and a tank wall in the actual jacking process, so that the sealing device is damaged, and the service life of the tank wall is finally influenced. In order to achieve the above object, according to a first aspect of the present invention, there is provided a low-temperature storage tank gas lift seal device, the low-temperature storage tank including a tank body and a dome formed in the tank body, the dome being located at a bottom of the tank body, a gas storage space for storing a gas for lift being formed between the dome and the tank body, the gas storage space being provided with a gas pump in communication, the gas pump being capable of pumping gas into the gas storage space to lift the dome from the bottom of the tank body to a top of the tank body so as to enclose the tank body to form the low-temperature storage tank, the gas lift seal device comprising: A sealing mechanism which is arranged around the periphery of the vault and has an abutting sealing state and a disengaging walking state, wherein in the abutting sealing state, the sealing mechanism can be abutted against the inner wall of the tank body and enables the vault to suspend in the tank body, in the disengaging walking state, the sealing mechanism can spray air flow towards the direction of the air storage space so as to be opposite to the air flow in the air storage space and form an isolating air ring, and The lifting mechanisms are distributed on the inner wall of the tank body at intervals along the circumferential direction, all the lifting mechanisms are located above the vault, all the lifting mechanisms are connected with the vault, all the lifting mechanisms can drive the vault to climb along the inner wall of the tank body when the sealing mechanism is in a separation walking state, and all the lifting mechanisms can also enable the vault to suspend in the tank body when the sealing mechanism is in the sealing state. In one embodiment, the sealing mechanism comprises: the connecting ring is arranged on the periphery of the vault in a surrounding mode, and an annular mounting position is formed on the connecting ring in a surrounding mode; The sealing component is arranged at the mounting position and surrounds the periphery of the connecting ring, an air cavity is formed in the sealing component, a plurality of air holes communicated with the air cavity are formed in the sealing component, the air holes are distributed at intervals along the circumferential direction and communicated with the lifting mechanism through an air pipe, so that the air cavity can be switched between an inflated state and a deflated state, and the sealing component can be abutted against the inner wall of the tank body and form an abutting sealing state when the air cavity is in the inflated state, and The isolation gas ring forming component is arranged on the connecting ring, the isolation gas ring forming component is positioned below the sealing component, a gas ring forming cavity is formed in the isolation gas ring forming component, and the gas ring forming cavity is communicated with the lifting mechanism through a pipeline; The isolating gas ring forming member is capable of ejecting a gas flow from within the gas ring forming chamber and forming the isolating gas ring when the sealing member is in the deflated state. In an embodiment, the sealing component comprises a wear-resistant layer, a tearing-resistant layer, an airti