Method for closing temporary door of double-metal full-capacity tank

Abstract

The invention provides a closing method for a temporary door of a bimetallic full-capacity tank, which comprises the following steps of: firstly closing a hot corner channel of a hot corner protection structure, then arranging a plurality of layers of glass bricks in a stacking manner in the direction from the hot corner protection structure to a secondary container, and finally closing a secondary temporary door of the secondary container. By means of the mode, a wide operation space can be provided for constructors, effective operation work is guaranteed, the engineering quality is guaranteed, sealing of the hot corner protection structure can be guaranteed firstly, sealing of the interlayer and the secondary container is reinforced on the basis that the hot corner protection structure is sealed, and the construction efficiency is improved. The thermal insulation performance of the hot corner protection structure and the secondary container can be effectively guaranteed, the phenomenon that cold conduction frosting is prone to occurring at the temporary door is avoided, and the stability of the overall structure of the double-metal full-capacity tank is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of bimetallic full containment tank construction, in particular to a method for closing a temporary construction door of a bimetallic full containment tank. Background Art

[0002] LNG, or liquefied natural gas, is characterized by low temperature, volatility, flammability and explosion. In recent years, LNG projects in coastal areas of my country have shown a trend of scale development, and the LNG storage tanks built have tended to be large-scale. Once a leak or fire occurs, it may cause the explosion of surrounding storage tanks and cause a "domino effect" that affects residential areas, industrial and mining enterprises, municipal facilities and other off-site land in the region. Therefore, as the main source of danger in the project, the performance of LNG storage tanks is crucial.

[0003] The domestic LNG industry is developing rapidly, the storage capacity of receiving stations is increasing, and the safety performance requirements for storage tanks are becoming higher and higher. As a type of tank for LNG above ground storage, full-capacity storage tanks have higher safety factors and technical economy than single-capacity tanks and double-capacity tanks.

[0004] At present, the full-capacity tank structure is more complex than the single-capacity tank, and the construction requirements are more stringent. Among them, the temporary door is used as a passage for personnel and materials to enter the interior of the tank during the construction process. Generally, it will be closed after the basic construction of the interior is completed. The conventional process is to first close the temporary door of the secondary container, then lay glass bricks at the temporary door, and finally close the hot corner to protect the temporary passage.

[0005] This process involves first closing the temporary door of the secondary container and then laying glass bricks at the temporary door. Construction workers are working in a narrow interlayer between the primary and secondary containers, with limited mobility. Construction quality cannot be guaranteed, and quality personnel are unable to monitor the process well. A variety of uncontrollable factors may lead to cold frost at the temporary door after operation, adversely affecting the overall structural stability of the full-containment tank. Summary of the invention

[0006] The purpose of the present invention is to solve the technical problem in the prior art that, when the temporary door of a full-containment tank is closed and constructed, the temporary door of the secondary container is closed first, and then the glass bricks at the temporary door are laid. The construction workers are working in the narrow interlayer between the primary and secondary containers, and their movements are restricted. The construction quality cannot be guaranteed, and the quality personnel are unable to monitor well. Various uncontrollable factors may cause cold conduction and frost to form at the temporary door after operation, which has an adverse effect on the overall structural stability of the full-containment tank.

[0007] In order to solve the above technical problems, the present invention provides a method for closing a temporary door of a bimetallic full containment tank, wherein the bimetallic full containment tank comprises a main container, a secondary container arranged outside the main container, and a thermal corner protection structure arranged inside the secondary container, wherein a thermal corner channel is provided on the thermal corner protection structure, and a secondary temporary door is provided at a position of the secondary container corresponding to the thermal corner channel;

[0008] The sealing method comprises the following steps:

[0009] closing the hot corner channel of the hot corner protection structure;

[0010] Laying a heat insulation structure between the hot corner channel and the secondary temporary door, the heat insulation structure comprises multiple layers of glass bricks, and the multiple layers of glass bricks are stacked in a direction from the hot corner protection structure toward the secondary container;

[0011] A secondary temporary door is provided for closing the secondary container, and a secondary door panel is arranged at the secondary temporary door.

[0012] In one embodiment of the present application, each layer of the glass bricks includes a plurality of brick bodies connected in sequence, and the circumference of the brick bodies is coated with low-temperature glue.

[0013] In one embodiment of the present application, the bricks in two adjacent layers of the glass bricks are arranged in a staggered manner in the height direction of the metal full-containment tank, and the rotating blocks in two adjacent layers of the glass bricks are arranged in a staggered manner in the width direction of the rotating blocks.

[0014] In one embodiment of the present application, the distance between the bricks in two adjacent layers of the glass bricks in the height direction of the metal full-containment tank is at least 200 mm, and the distance between the rotating blocks in two adjacent layers of the glass bricks in the width direction of the rotating blocks is at least 150 mm.

[0015] In one embodiment of the present application, foaming material and / or low-temperature glue are filled between two adjacent layers of glass bricks.

[0016] In one embodiment of the present application, the secondary door panel is arranged at the secondary temporary door by single-sided welding.

[0017] In one embodiment of the present application, the sealing method further comprises: after the secondary door panel is arranged at the secondary temporary door, leak detection is performed by ultrasonic detection method and / or vacuum box method.

[0018] In one embodiment of the present application, the secondary door panel includes a plurality of strip plates connected in sequence in the height direction of the bimetallic full containment tank, and in the height direction of the bimetallic full containment tank, the width of the lower strip plate is greater than the width of the adjacent upper strip plate.

[0019] In one embodiment of the present application, when closing the secondary temporary door of the secondary container, a fire retardant coating is applied on the glass bricks corresponding to the connection between the secondary door panel and the secondary temporary door.

[0020] In one embodiment of the present application, low-temperature glue is spot-coated between two adjacent layers of the glass bricks.

[0021] It can be seen from the above technical scheme that the beneficial effects of the present invention are as follows: in the method for closing the temporary door of the bimetallic full containment tank of the present invention, the hot corner channel of the hot corner protection structure is closed first, and then multiple layers of glass bricks are stacked from the hot corner protection structure toward the secondary container, and finally the secondary temporary door of the secondary container is closed. This method can not only provide construction personnel with a relatively ample operating space to ensure effective operation and project quality, but also can first ensure the closure of the hot corner protection structure, and then strengthen the closure of the interlayer and the secondary container on the basis of the closure of the hot corner protection structure, which can effectively ensure the thermal insulation performance of the hot corner protection structure and the secondary container, avoid the phenomenon of cold conduction and frost at the temporary door, and ensure the stability of the overall structure of the bimetallic full containment tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a flow chart of a method for closing a temporary door of a bimetallic full containment tank.

[0023] Figure 2 It is a schematic diagram of the closed structure of a temporary door for building a bimetallic full containment tank.

[0024] Figure 3 It is a schematic diagram of the structure of multi-layer glass bricks in the width direction of the insulation structure.

[0025] Figure 4 It is a schematic diagram of the structure of multi-layer glass bricks in the height direction of the insulation structure.

[0026] Figure 5 This is a schematic diagram of the structure of the belt plate in the door panel.

[0027] The reference numerals in the accompanying drawings are as follows: 100, bimetallic full containment tank; 10, thermal corner protection structure; 11, thermal corner door panel; 20, secondary container; 21, secondary door panel; 211, strip plate; 30, thermal insulation structure; 31, glass brick; 311, brick body. DETAILED DESCRIPTION

[0028] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0029] In the description of the present application, it should be understood that in the embodiments shown in the drawings, the indications of directions or positional relationships (such as up, down, left, right, front and back, etc.) are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] See also Figure 1 and Figure 2 An embodiment of the present application provides a method for closing a temporary door of a bimetallic full containment tank 100. The method is used to close the temporary door of the bimetallic full containment tank 100, which can effectively improve the phenomenon that the temporary door is prone to frost after the bimetallic full containment tank 100 is in operation, thereby ensuring the stability of the overall structure of the bimetallic full containment tank 100.

[0032] Before introducing the sealing method, the basic structure of the bimetallic full containment tank 100 is briefly introduced. Specifically, the bimetallic full containment tank 100 includes a main container, a secondary container 20 disposed outside the main container, and a thermal corner protection structure 10 disposed inside the secondary container 20. The main container includes a main cylinder and a main bottom plate disposed at the bottom of the main cylinder, and the secondary container 20 includes a secondary cylinder, a secondary bottom plate disposed at the bottom of the secondary cylinder, and a dome disposed at the top of the secondary cylinder.

[0033] The main cylinder is arranged vertically, and the main cylinder and the main bottom plate can be made of austenitic stainless steel or 9% nickel steel that can withstand low-temperature media. The main container can be used to hold low-temperature liquid and evaporated gas, and the secondary container 20 is arranged outside the main container to ensure the tightness of the overall structure. The secondary container 20 can also be made of metal materials such as austenitic stainless steel or 9% nickel steel that can withstand low-temperature media.

[0034] The thermal corner protection structure 10 is arranged inside the secondary container 20, and the thermal corner protection structure includes a thermal corner cylinder and a corner protection bottom plate arranged at the bottom of the thermal corner cylinder. The thermal corner protection structure 10 is mainly used to prevent the secondary container 20 from generating uncontrollable cracks due to low temperature impact when the main container leaks, and to protect the bimetallic full containment tank 100 from low temperature damage, thereby ensuring the stability of the overall structure.

[0035] A hot corner channel is provided on the hot corner cylinder of the hot corner protection structure 10, and a secondary temporary door is provided on the secondary cylinder of the secondary container 20. The secondary temporary door is arranged opposite to the hot corner channel. Through the secondary temporary door and the hot corner channel, personnel and materials can enter the main container conveniently during the construction process.

[0036] In the present application, the temporary door of the bimetallic full containment tank 100 includes a hot corner channel provided on the hot corner protection structure 10 and a secondary temporary door provided on the secondary container 20 .

[0037] In the present application, the method for closing the temporary door of the bimetallic full containment tank 100 comprises the following steps:

[0038] S10, closing the hot corner channel of the hot corner protection structure 10;

[0039] S20, laying a heat insulation structure 30 between the hot corner channel and the secondary temporary door, the heat insulation structure 30 comprising multiple layers of glass bricks 31, the multiple layers of glass bricks 31 being stacked in a direction from the hot corner protection structure 10 toward the secondary container 20;

[0040] S30, closing the secondary temporary door of the secondary container 20, and setting a secondary door panel 21 at the secondary temporary door.

[0041] In the existing technical scheme, the temporary door of the bimetallic full containment tank 100 is closed by first closing the temporary door of the secondary container 20, then laying the glass bricks 31 at the temporary door, and finally closing the temporary passage for thermal corner protection at the thermal corner protection structure 10. This will cause construction workers to work in the narrow interlayer between the thermal corner protection structure 10 and the secondary container 20, which not only restricts their activities but also affects the construction quality, resulting in the phenomenon of cold conduction and frost at the temporary door, and the overall stability of the bimetallic full containment tank 100 is poor.

[0042] In the sealing method provided in the present application, the hot corner channel of the hot corner protection structure 10 is first sealed, and then multiple layers of glass bricks 31 are stacked in the direction from the hot corner protection structure 10 toward the secondary container 20, and finally the secondary temporary door of the secondary container 20 is closed. This method can not only provide construction personnel with a relatively ample operating space to ensure effective operation and project quality, but also can first ensure the sealing of the hot corner protection structure 10, and then strengthen the sealing of the interlayer and the secondary container 20 on the basis of the sealing of the hot corner protection structure 10, which can effectively ensure the thermal insulation performance of the hot corner protection structure 10 and the secondary container 20, avoid the phenomenon of cold conduction and frost at the temporary door, and ensure the stability of the overall structure of the bimetallic full containment tank 100.

[0043] For step S10, the hot corner channel of the hot corner protection structure 10 is closed by setting a hot corner door plate 11 at the hot corner channel. Specifically, the hot corner door plate 11 is welded and fixed at the hot corner channel, so as to close the hot corner protection channel first.

[0044] Combination Figure 3 and Figure 4 In step S20, a heat insulation structure 30 is laid between the hot corner channel and the secondary temporary door, and the heat insulation structure 30 includes multiple layers of glass bricks 31, and the multiple layers of glass bricks 31 are stacked in a direction from the hot corner protection structure 10 toward the secondary container 20.

[0045] Specifically, multiple layers of glass bricks 31 are laid in a stacked manner in the direction from the hot corner protection structure 10 to the secondary container 20, and the multiple layers of glass bricks 31 constitute the heat insulation structure 30. Each layer of glass bricks 31 includes a plurality of brick bodies 311 connected in sequence, and the surrounding sides of the brick bodies 311 are coated with low-temperature glue. This arrangement enables the heat insulation structure 30 to have better insulation performance, thereby ensuring the heat insulation performance of the inner container 10, avoiding the phenomenon of cold conduction and frost at the temporary door, and ensuring the stability of the overall structure of the bimetallic full containment tank 100.

[0046] In one example of this embodiment, three layers of glass bricks 31 may be laid between the hot corner channel and the secondary temporary door. The larger gaps between the first layer of glass bricks 31 and the second layer of glass bricks 31, and between the second layer of glass bricks 31 and the third layer of glass bricks 31 are expanded and filled with cold-insulating foaming materials. In other examples, the smaller gaps between the first layer of glass bricks 31 and the second layer of glass bricks 31, and between the second layer of glass bricks 31 and the third layer of glass bricks 31 may be filled with low-temperature glue.

[0047] This not only improves the tightness of the connection between the multiple layers of glass bricks 31, but also ensures the stability of the overall structure of the thermal insulation structure 30, so that it can exert better thermal insulation performance.

[0048] In addition, the circumference of the glass brick 31 can be fully coated with low-temperature glue, and the low-temperature glue can be applied between two adjacent layers of glass bricks 31 by spot coating.

[0049] In other examples of this embodiment, the number of layers of glass bricks 31 between the hot corner channel and the secondary temporary door can also be a number, such as two layers, four layers, five layers, etc., which are not limited too much here, and foam material is filled between two adjacent layers of glass bricks 31.

[0050] In the closing method of the present application, step S10 can realize the closing of the hot corner channel of the hot corner protection structure 10, first ensure the overall sealing of the hot corner protection structure 10, and then proceed to step S20, lay the insulation structure 30 between the hot corner channel and the secondary temporary door, the construction personnel have ample operating space, can effectively ensure the quality of the project, and further ensure the insulation effect, thereby avoiding the phenomenon of cold conduction and frost at the temporary door.

[0051] When laying the heat insulation structure 30, the bricks 311 in two adjacent layers of glass bricks 31 can be arranged in a staggered manner in the height direction of the metal full containment tank, and the rotating blocks in two adjacent layers of glass bricks 31 can be arranged in a staggered manner in the width direction of the rotating blocks. Such an arrangement can not only facilitate the construction operation of the construction personnel, but also ensure the tightness of the connection of each rotating block, thereby ensuring an effective heat insulation effect.

[0052] Specifically, during actual construction, the brick bodies 311 in two adjacent layers of glass bricks 31 can be staggered by at least 200 mm in the height direction of the metal full-containment tank, and the rotating blocks in two adjacent layers of glass bricks 31 can be staggered by at least 150 mm in the width direction.

[0053] After the installation of the heat insulating structure 30 in step S20 is completed, step S30 is performed to close the secondary temporary door of the secondary container 20 and to set a secondary door panel 21 at the secondary temporary door.

[0054] In step S30, the secondary door panel 21 is installed at the secondary temporary door by single-sided welding. When closing the secondary temporary door of the secondary container 20, a fire-retardant coating is applied to the glass brick 31 at the connection between the secondary door panel 21 and the secondary temporary door. This can prevent the welding heat from igniting the foaming material during the closing of the secondary temporary door, avoid the occurrence of fire, and ensure the safety of the operation.

[0055] like Figure 5 As shown, the secondary door panel 21 includes a plurality of strips 211 sequentially connected in the height direction of the bimetallic full containment tank 100, and in the height direction of the bimetallic full containment tank 100, the width of the lower strip 211 is greater than the width of the adjacent upper strip 211. Such an arrangement can not only facilitate the construction operation of the construction personnel, but also ensure the overall structural stability of the secondary door panel 21, and ensure effective thermal insulation effect.

[0056] After completing step S30, that is, after setting the secondary door panel 21 at the secondary temporary door, the sealing method of the present application also includes leak detection by ultrasonic detection and / or vacuum box method, so as to test the metal full containment tank as a whole to check whether the project meets the operating standards.

[0057] The method for closing the temporary door of the bimetallic full containment tank of the present application is to first close the hot corner channel of the hot corner protection structure, then stack multiple layers of glass bricks from the hot corner protection structure in the direction of the secondary container, and finally close the secondary temporary door of the secondary container. This method can not only provide construction personnel with a relatively ample operating space to ensure effective operation and project quality, but also can first ensure the closure of the hot corner protection structure, and then strengthen the closure of the interlayer and the secondary container on the basis of the closure of the hot corner protection structure, which can effectively ensure the thermal insulation performance of the hot corner protection structure and the secondary container, avoid the phenomenon of cold conduction and frost at the temporary door, and ensure the stability of the overall structure of the bimetallic full containment tank.

[0058] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A method for closing a temporary door of a bimetallic full containment tank, the bimetallic full containment tank comprising a main container, a secondary container arranged outside the main container, and a thermal corner protection structure arranged inside the secondary container, the thermal corner protection structure is provided with a thermal corner channel, and the secondary container is provided with a secondary temporary door at a position corresponding to the thermal corner channel; It is characterized in that The sealing method comprises the following steps: closing the hot corner channel of the hot corner protection structure; Laying a heat insulation structure between the hot corner channel and the secondary temporary door, the heat insulation structure comprises multiple layers of glass bricks, and the multiple layers of glass bricks are stacked in a direction from the hot corner protection structure toward the secondary container; A secondary temporary door is provided for closing the secondary container, and a secondary door panel is arranged at the secondary temporary door.

2. The method for closing the temporary door of a bimetallic full containment tank according to claim 1, characterized in that: Each layer of the glass bricks includes a plurality of brick bodies connected in sequence, and the circumference of the brick bodies is coated with low-temperature glue.

3. The method for closing the temporary door of a bimetallic full containment tank according to claim 2, characterized in that: The brick bodies in two adjacent layers of the glass bricks are arranged in a staggered manner in the height direction of the metal full-containment tank, and the rotating blocks in two adjacent layers of the glass bricks are arranged in a staggered manner in the width direction of the rotating blocks.

4. The method for closing the temporary door of a bimetallic full containment tank according to claim 3, characterized in that: The distance between the bricks in two adjacent layers of the glass bricks in the height direction of the metal full-containment tank is at least 200 mm, and the distance between the rotating blocks in two adjacent layers of the glass bricks in the width direction of the rotating blocks is at least 150 mm.

5. The method for closing the temporary door of a bimetallic full containment tank according to claim 1, characterized in that: The space between two adjacent layers of glass bricks is filled with foaming material and / or low-temperature glue.

6. The method for closing the temporary door of a bimetallic full containment tank according to claim 1, characterized in that: The secondary door panel is arranged at the secondary temporary door by single-sided welding.

7. The method for closing the temporary door of a bimetallic full containment tank according to claim 1, characterized in that: The closing method further comprises: after the secondary door panel is arranged at the secondary temporary door, leak detection is performed by ultrasonic detection method and / or vacuum box method.

8. The method for closing the temporary door of a bimetallic full containment tank according to claim 1, characterized in that: The secondary door plate includes a plurality of strip plates connected in sequence in the height direction of the bimetallic full containment tank, and in the height direction of the bimetallic full containment tank, the width of the lower strip plate is greater than the width of the adjacent upper strip plate.

9. The method for closing the temporary door of a bimetallic full containment tank according to claim 1, characterized in that: When closing the secondary temporary door of the secondary container, a fire retardant coating is applied on the glass bricks corresponding to the connection between the secondary door panel and the secondary temporary door.

10. The method for closing the temporary door of a bimetallic full containment tank according to claim 1, characterized in that: Apply low-temperature glue between two adjacent layers of glass bricks.

Images