Secondary throat with telescopic assembled flexible structure for transmitting ultrahigh-temperature gas liner

Abstract

The invention relates to a secondary throat of a telescopic assembled flexible structure of an inner container for transmitting ultra-high-temperature gas, and belongs to the technical field of ultra-high-temperature fluid pipelines. The problems of thermal expansion deformation, high cost and low safety coefficient of different parts of the same material of equipment under the high-temperature working condition are solved. According to the technical scheme, a carbon structural steel outer cylinder, heat insulation material filler and an assembled flexible inner container are adopted to form a three-layer cylinder structure, and a movable plate, a movable strip and a pressing block are connected and fixed according to different positions through fixing components of three structural modes. Through the three-layer cylinder body structure, the problems that the whole body is made of carbon structural steel materials and cannot work in an ultra-high-temperature environment, the whole body is made of high-temperature alloy, the manufacturing cost is high, the deformation amount is large after heating, and the structure is unstable are solved, the equipment manufacturing cost is reduced, modular manufacturing can be conducted, and the manufacturing efficiency is improved. When the inner container is repaired, only the single movable plate with the problem needs to be replaced, overall replacement is not needed, and the maintenance difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of ultra-high temperature fluid pipelines, and in particular to a secondary throat with a telescopically assembled flexible structure for transmitting ultra-high temperature gas. Background Art

[0002] Protecting the pipeline system is an important function of the fluid pipeline throat. Vibration not only causes noise, but also causes aging and wear of the pipeline. The fluid pipeline throat can effectively reduce the force on the pipeline, avoid rupture or damage caused by long-term vibration, and play a protective role. The benefits of using a fluid pipeline throat mainly include reducing vibration and noise, balancing pressure fluctuations, protecting the pipeline system, and improving fluid transportation efficiency.

[0003] First, reducing vibration and noise is an important benefit of fluid pipe throats. In the pipeline system, the flow of water, gas or liquid will generate vibration and noise, which not only affects the operating efficiency of the equipment, but may also cause damage to the entire pipeline structure. The fluid pipe throat absorbs these vibrations through its flexible material structure, thereby greatly reducing noise and protecting the pipeline system from damage; secondly, balancing pressure fluctuations is also an important function of the fluid pipe throat. In the process of fluid transportation, pressure fluctuations are inevitable. The pipe throat can help balance these pressure fluctuations, ensure the smooth flow of the fluid in the pipeline, and avoid damage to the pipeline caused by sudden changes in pressure.

[0004] At present, the throat of a certain test bench adopts the carbon steel pipe (straight section) and expansion joint connected to the secondary throat (conical section) which are common in the field of fluid pipeline transportation. It can undertake the transportation of general high-temperature (≤475℃) gas. However, the throat that meets the ultra-high temperature (≥1200℃) gas transmission needs is generally made of high-temperature alloy materials, which is relatively expensive. In order to reduce costs, the conventional method is to use a high-temperature alloy inner liner with a carbon structural steel outer cylinder filled with insulating material in the middle of the jacket structure. This type of throat structure generally cannot meet the ultra-high temperature fluid environment.

[0005] In the prior art, the equipment adopts the conventional expansion joint plus secondary throat solution, and the material is carbon structural steel, which can only withstand general high temperatures. After a test bench is upgraded, it is required to transmit ultra-high temperature gas, and its temperature exceeds the maximum working temperature of carbon steel. The original equipment cannot realize the transmission function; and if the pipes, expansion joints and secondary throats are all replaced with high-temperature alloy materials, not only will the cost of the equipment be greatly increased, but also due to the large temperature difference between the inside and outside of the pipe wall, the thermal stress of the cylinder material is too large and it is very easy to deform, threatening the safety and stability of the equipment; if a high-temperature alloy is used to make an overall rigid inner liner, a carbon structural steel is used to make an outer cylinder, and the middle is filled with insulating material, when transmitting high-temperature gas, due to the different temperatures and thermal expansion coefficients of different materials, the inner liner and the outer cylinder will undergo different degrees of thermal expansion, which will cause the equipment to twist and deform, and fail to realize the function of transmitting ultra-high temperature gas, and even cause safety hazards.

[0006] Therefore, it is urgent to propose a secondary throat with a retractable assembled flexible structure for transmitting ultra-high temperature gas liner, so as to solve the problems of thermal expansion and deformation of different parts of the same material of equipment under high temperature working conditions, high cost and low safety factor in the existing technology. Summary of the invention

[0007] In view of the above facts, in order to solve the problems of thermal expansion and deformation of different parts of the same material of equipment under high-temperature working conditions, high cost and low safety factor in the prior art, the present invention further designs a secondary throat with a retractable assembled flexible structure for transmitting ultra-high temperature gas liner.

[0008] To achieve the above object, the present invention adopts the following technical solution:

[0009] A secondary throat for transmitting ultra-high temperature gas with a retractable and assembled flexible structure of the inner liner, including an outer cylinder, a movable inner liner, and thermal insulation materials;

[0010] The inner wall of the outer cylinder is provided with a movable inner liner, and a heat-insulating material is filled between the outer cylinder and the movable inner liner;

[0011] The movable liner is assembled by a plurality of movable plates, axial movable strips, circumferential movable strips and pressing blocks to form a retractable and flexible liner structure;

[0012] The movable plate is installed on the inner wall of the outer cylinder, and a gap is reserved at the joint of adjacent movable plates to form an axial gap and a circumferential gap. An axial movable bar is installed in the axial gap, and a circumferential movable bar is installed in the circumferential gap. The pressure block is installed at the intersection of the movable plate, the axial movable bar, and the circumferential movable bar.

[0013] Further: the movable plate is installed on the inner wall of the outer tube through three connection structures, and the three connection structures are respectively defined as a central fixed connection structure, a connection mechanism without a movable strip, and a connection mechanism with a movable strip;

[0014] The center of the movable plate is connected to the outer cylinder through a central fixed connection structure, which includes a first lower gasket, a first connecting pipe, and a positioning pin. The first connecting pipe is welded on the inner wall of the outer cylinder, and the positioning pin is welded inside the first connecting pipe. The first lower gasket and the movable plate are welded to the positioning pin in sequence.

[0015] The geometric center and the edge of the movable plate are connected to the outer cylinder through a plurality of non-movable strip connection mechanisms, the non-movable strip connection mechanisms include a first upper gasket, a second lower gasket, a second connecting tube, and a first connecting nail. The second connecting tube is welded on the inner wall of the outer cylinder, the first connecting nail is welded inside the second connecting tube, the second lower gasket, the movable plate, and the first upper gasket are welded on the first connecting nail in sequence, and the upper surface of the first upper gasket is flush with the upper surface of the first connecting nail;

[0016] The edge of the movable plate is connected to the outer cylinder through a movable bar connecting mechanism, which includes a second upper gasket, a third connecting tube, and a second connecting nail. The third connecting tube is welded on the inner wall of the outer cylinder, and the second connecting nail is welded inside the third connecting tube. The second connecting nail is welded with an axial movable bar or a circumferential movable bar, a movable plate, and a second upper gasket in sequence, and the upper surface of the second upper gasket is flush with the upper surface of the second connecting nail.

[0017] Furthermore: the outer cylinder is made of carbon structural steel.

[0018] Furthermore: the movable plate, the axial movable bar, the circumferential movable bar and the pressing block are all made of high-temperature alloy thin plates.

[0019] Furthermore: the first upper gasket, the second upper gasket, the first lower gasket, the second lower gasket, the positioning pin, the first connecting pin, and the second connecting pin are all made of high-temperature alloy, and the first connecting pipe, the second connecting pipe, and the third connecting pipe are all made of stainless steel.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention solves the problems that the entire structure made entirely of carbon structural steel cannot work in ultra-high temperature environments, and the entire structure made entirely of high-temperature alloys has high manufacturing costs, large deformation after heating, and unstable structure through a three-layer cylinder structure.

[0022] 2. The flexible inner liner assembled by movable plates, movable bars and pressing blocks of the present invention effectively avoids the adverse factors of deformation, interference, extrusion and collision caused by thermal expansion of the rigid inner liner, realizes self-sealing of the gap at the joint of the inner liner, and solves the problem of insulation material being sucked out due to the high gas flow rate in the equipment.

[0023] 3. The present invention utilizes three types of fixing components to connect movable plates, movable bars and pressing blocks in different areas in different ways, thereby solving the problem of movement of the connection pins and positioning pin holes after thermal expansion of the movable plates, movable bars and pressing blocks, and avoiding interference, extrusion and collision between the movable plates, movable bars, pressing blocks and fixed components.

[0024] 4. The present invention reduces the manufacturing cost of the equipment and can be manufactured in a modular manner. When repairing the inner tank, only a single movable plate with a problem needs to be replaced without replacing the entire plate, thereby reducing the difficulty of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is the overall structural diagram of the present invention;

[0026] Figure 2 is an axial cross-sectional view of the present invention (this view only shows one row of inner liner);

[0027] Figure 3 for Figure 2 A magnified image of point A;

[0028] Figure 4 This is a schematic diagram of the position of fixed components (the movable plate in the middle is not drawn);

[0029] Figure 5 Schematic diagram of the central fixed connection structure;

[0030] Figure 6 It is a schematic diagram of a connection mechanism without a movable bar;

[0031] Figure 7 It is a schematic diagram of a connecting mechanism with a movable bar.

[0032] In the figure: 1-outer cylinder, 2-movable inner liner, 3-insulating material, 4-movable plate, 5-axial movable bar, 6-circumferential movable bar, 7-pressing block, 8-first upper gasket, 9-first lower gasket, 10-first connecting pipe, 11-positioning nail, 12-first connecting nail, 13-center fixed connecting structure, 14-connecting mechanism without movable bar, 15-connecting mechanism with movable bar, 18-second upper gasket, 19-second lower gasket, 20-second connecting pipe, 30-third connecting pipe, 22-second connecting nail. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] In the present application, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "middle", "outer", "front", "back", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0036] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0037] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0040] Embodiment: The secondary throat of the flexible structure of the inner liner for transmitting ultra-high temperature gas of this embodiment includes an outer tube 1, a movable inner liner 2, and a heat insulation material 3;

[0041] The inner wall of the outer tube 1 is installed with a movable inner liner 2, and a heat insulation material 3 is filled between the outer tube 1 and the movable inner liner 2;

[0042] The movable liner 2 is assembled by a plurality of movable plates 4, axial movable bars 5, circumferential movable bars 6, and a pressing block 7 to form a retractable and flexible liner structure;

[0043] The movable plate 4 is installed on the inner wall of the outer tube 1, and a gap is reserved at the joint of adjacent movable plates 4 to form an axial gap and a circumferential gap. An axial movable bar 5 is installed in the axial gap, and a circumferential movable bar 6 is installed in the circumferential gap. The pressure block 7 is installed at the intersection of the movable plate 4, the axial movable bar 5, and the circumferential movable bar 6.

[0044] More specifically: the pressing block 7 serves to connect the movable plate 4, the axial movable bar 5, the circumferential movable bar 6 and the fixed joint portion.

[0045] More specifically: the movable plate 4 is installed on the inner wall of the outer tube 1 through three connection structures, which are respectively defined as a central fixed connection structure 13, a connection mechanism without a movable bar 14, and a connection mechanism with a movable bar 15;

[0046] The center of the movable plate 4 is connected to the outer tube 1 through a central fixed connection structure 13, and the central fixed connection structure 13 includes a first lower gasket 9, a first connecting pipe 10, and a positioning pin 11. The first connecting pipe 10 is welded on the inner wall of the outer tube 1, and the positioning pin 11 is welded inside the first connecting pipe 10. The first lower gasket 9 and the movable plate 4 are welded to the positioning pin 11 in sequence;

[0047] The movable plate 4 is connected to the outer cylinder 1 between its geometric center and its edge through a plurality of non-movable bar connection mechanisms 14, which include a first upper gasket 8, a second lower gasket 19, a second connection tube 20, and a first connection nail 12. The second connection tube 20 is welded on the inner wall of the outer cylinder 1, and the first connection nail 12 is welded inside the second connection tube 20. The second lower gasket 19, the movable plate 4, and the first upper gasket 8 are welded on the first connection nail 12 in sequence, and the upper surface of the first upper gasket 8 is flush with the upper surface of the first connection nail 12.

[0048] The edge of the movable plate 4 is connected to the outer tube 1 through a movable bar connecting mechanism 15, and the movable bar connecting mechanism 15 includes a second upper gasket 18, a third connecting tube 30, and a second connecting nail 22. The third connecting tube 30 is welded on the inner wall of the outer tube 1, and the second connecting nail 22 is welded inside the third connecting tube 30. The axial movable bar 5 or the circumferential movable bar 6, the movable plate 4, and the second upper gasket 18 are welded on the second connecting nail 22 in sequence, and the upper surface of the second upper gasket 18 is flush with the upper surface of the second connecting nail 22.

[0049] More specifically: the outer cylinder 1 is made of carbon structural steel, and the heat insulating material 3 is a polycrystalline fiber blended blanket, which prevents the heat of the movable inner liner 2 from being transferred to the outer cylinder 1 through heat conduction or heat radiation.

[0050] More specifically, the axial movable bar 5 , the circumferential movable bar 6 and the pressing block 7 are made of high-temperature alloy thin plates.

[0051] More specifically: the first upper gasket 8, the second upper gasket 18, the first lower gasket 9, the second lower gasket 19, the positioning pin 11, the first connecting pin 12, and the second connecting pin 22 are all made of high-temperature alloy, and the first connecting pipe 10, the second connecting pipe 20, and the third connecting pipe 30 are all made of stainless steel.

[0052] More specifically: the movable plate 4 is made of a high-temperature alloy sheet, so as to avoid the situation where the outer tube 1 and the movable inner liner 2 are squeezed or interfered with each other due to thermal expansion.

[0053] More specifically: the movable plate 4 is provided with a through hole whose size is larger than the diameter of the positioning pin 11, the first connecting pin 12, and the second connecting pin 22 in the fixing component and corresponds to the position of the positioning pin 11, the first connecting pin 12, and the second connecting pin 22. The size of the through hole is larger than the size of the thermal expansion of the first connecting pin 12 and the second connecting pin 22 in the fixing component at an ultra-high temperature of 1200°C.

[0054] More specifically: the size of the gap between the movable plates 4 is larger than the size of the thermal expansion of two adjacent movable plates at an ultra-high temperature of 1200°C (the expansion value from the geometric center to the periphery). When the equipment starts working and ultra-high temperature gas passes through the inside, the movable plate 4 expands due to the heat. The reserved gap just ensures that the adjacent movable plates 4 do not interfere, squeeze or collide, thereby avoiding deformation of the movable inner liner 2 due to interference, squeezing and collision, and also prevents the overall thermal stress of the movable inner liner 2 from acting on the outer cylinder 1, avoiding the hidden danger of thermal stress generated by the traditional jacketed structure cylinder.

[0055] More specifically: the widths of the axial movable strips 5 and the circumferential movable strips 6 are determined according to the gap of the movable plate 4 and the thermal expansion coefficient of the material thereof, and a margin is left.

[0056] More specifically: when the ultra-high temperature gas begins to pass through the equipment, as the temperature rises, the movable plate 4, the axial movable bar 5, the circumferential movable bar 6 and the pressure block 7 simultaneously undergo thermal expansion, the gaps gradually close, and the thermal insulation material 3 is compressed to form a self-closed structure. As the temperature rises, the gaps become smaller and smaller, and the compression force becomes greater and greater, effectively preventing the thermal insulation material 3 from being sucked out.

[0057] More specifically: the gaps between the fixed components are filled with heat-insulating material 3, and the central fixed connection structure 13 is rigidly connected to the outer cylinder 1 and the movable plate 4;

[0058] The non-movable strip connection mechanism 14 is rigidly connected to the outer cylinder 1 and flexibly connected to the movable plate 4. The diameter of the first connection nail 12 is smaller than the diameter of the through hole, so that the movable plate 4 can move in a small range in the direction of thermal expansion.

[0059] The movable bar connecting mechanism 15 is rigidly connected to the outer tube 1 and flexibly connected to the movable plate 4, the axial movable bar 5 or the circumferential movable bar 6. The diameter of the second connecting nail 22 is smaller than the diameter of the through hole, so that the movable plate 4, the axial movable bar 5, and the circumferential movable bar 6 can move in a small range in the direction of thermal expansion.

[0060] More specifically: three different fixing component structures ensure that the movable liner 2 can have a relatively fixed position and can adapt to the thermal expansion caused by the transportation of ultra-high temperature gas, solving the problem that high-temperature alloys cannot be directly welded to carbon structural steel.

[0061] More specifically: welding is performed in the order of carbon steel (outer tube 1) - stainless steel (connecting pipe 10) - high-temperature alloy (movable plate 4, first upper gasket 8, second upper gasket 18, first lower gasket 9, second lower gasket 19, positioning pin 11, first connecting pin 12, second connecting pin 22), which solves the problem of poor weldability between high-temperature alloy and carbon structural steel.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. As long as there is no structural conflict, the various features in the specific implementation methods disclosed in this application can be combined with each other in any way, and the essence of the corresponding technical solutions will not deviate from the scope of the technical solutions of the present invention.

[0063] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A secondary throat with a flexible structure for transmitting ultra-high temperature gas in a retractable inner tank, characterized in that: It comprises an outer tube (1), a movable inner liner (2), and a heat insulating material (3); A movable inner liner (2) is installed on the inner wall of the outer cylinder (1), and a heat insulating material (3) is filled between the outer cylinder (1) and the movable inner liner (2); The movable inner liner (2) is assembled from a plurality of movable plates (4), axial movable strips (5), circumferential movable strips (6), and a pressing block (7) to form a retractable and flexible inner liner structure; The movable plate (4) is installed on the inner wall of the outer cylinder (1), and a gap is reserved at the joints of adjacent movable plates (4) to form an axial gap and a circumferential gap. An axial movable bar (5) is installed in the axial gap, and a circumferential movable bar (6) is installed in the circumferential gap. The pressure block (7) is installed at the intersection of the movable plate (4), the axial movable bar (5), and the circumferential movable bar (6).

2. The secondary throat of the flexible structure of the retractable inner tank for transmitting ultra-high temperature gas according to claim 1 is characterized in that: The movable plate (4) is mounted on the inner wall of the outer cylinder (1) via three connection structures, wherein the three connection structures are respectively defined as a central fixed connection structure (13), a connection mechanism without a movable strip (14), and a connection mechanism with a movable strip (15); The center of the movable plate (4) is connected to the outer cylinder (1) via a central fixed connection structure (13), the central fixed connection structure (13) comprising a first lower gasket (9), a first connecting pipe (10), and a positioning pin (11), the first connecting pipe (10) is welded to the inner wall of the outer cylinder (1), the positioning pin (11) is welded inside the first connecting pipe (10), and the first lower gasket (9) and the movable plate (4) are welded to the positioning pin (11) in sequence; The movable plate (4) is connected to the outer cylinder (1) between its geometric center and its edge via a plurality of non-movable bar connection mechanisms (14), the non-movable bar connection mechanisms (14) comprising a first upper gasket (8), a second lower gasket (19), a second connection tube (20), and a first connection nail (12); the second connection tube (20) is welded to the inner wall of the outer cylinder (1), the first connection nail (12) is welded inside the second connection tube (20), the second lower gasket (19), the movable plate (4), and the first upper gasket (8) are welded to the first connection nail (12) in sequence, and the upper surface of the first upper gasket (8) is flush with the upper surface of the first connection nail (12); The edge of the movable plate (4) is connected to the outer cylinder (1) through a movable bar connection mechanism (15), and the movable bar connection mechanism (15) comprises a second upper gasket (18), a third connecting tube (30), and a second connecting nail (22). The third connecting tube (30) is welded on the inner wall of the outer cylinder (1), and the second connecting nail (22) is welded inside the third connecting tube (30). The second connecting nail (22) is welded with an axial movable bar (5) or a circumferential movable bar (6), a movable plate (4), and a second upper gasket (18) in sequence, and the upper surface of the second upper gasket (18) is flush with the upper surface of the second connecting nail (22).

3. The secondary throat of the flexible structure of the retractable inner tank for transmitting ultra-high temperature gas according to claim 1 is characterized in that: The outer cylinder (1) is made of carbon structural steel.

4. The secondary throat of the flexible structure of the retractable inner tank for transmitting ultra-high temperature gas according to claim 2 is characterized in that: The movable plate (4), the axial movable strip (5), the circumferential movable strip (6) and the pressing block (7) are all made of high-temperature alloy thin plates.

5. The secondary throat of the flexible structure of the retractable inner tank for transmitting ultra-high temperature gas according to claim 2 is characterized in that: The first upper gasket (8), the second upper gasket (18), the first lower gasket (9), the second lower gasket (19), the positioning pin (11), the first connecting pin (12), and the second connecting pin (22) are all made of high-temperature alloy, and the first connecting pipe (10), the second connecting pipe (20), and the third connecting pipe (30) are all made of stainless steel.

Images