High-temperature and high-pressure air conveying straight pipeline for combustion tester of gas turbine

Abstract

The invention provides a high-temperature and high-pressure air conveying straight pipeline for a combustion tester of a gas turbine, and the pipeline comprises a pipeline outer wall which is of a hollow pipe structure; the pipeline inner wall is nested in the pipeline outer wall, and the pipeline outer wall forms a double-layer structure; the inner wall of the pipeline is of a hollow pipe structure of a sectional type structure, and connectors are arranged between the hollow pipe structures of the sectional type structure. The supporting pieces are supported in an interlayer between the pipeline outer wall and the pipeline inner wall, and the multiple supporting pieces are arranged along the interlayer at intervals; the pipeline is of a double-layer structure, the problems of temperature resistance and pressure resistance are solved separately, the outer layer wall only bears the pressure working condition, the inner layer wall only bears the temperature working condition, on one hand, the use requirement of high-temperature and high-pressure air is met, on the other hand, thermal expansion of a straight pipeline is greatly reduced, and the overall design process of the pipeline is simplified; and the test efficiency is improved to a certain extent.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aero-engine combustion test, in particular to a high-temperature and high-pressure air conveying straight pipe for a gas turbine combustion tester. BACKGROUND

[0002] In various tests carried out in gas turbines and gas turbine combustion chambers, the air pipe in the test equipment needs to provide compressed air for the test piece continuously, and the compressed air often has a certain pressure and temperature, the pressure generally reaches 2MPa or higher, and the temperature also reaches more than 700℃. In recent years, with the continuous increase of pressure and temperature, requirements have been put forward for the air pipe. On the one hand, the strength and rigidity of the pipe itself need to be met, and on the other hand, the influence of the thermal expansion of the pipe on other equipment needs to be reduced.

[0003] At present, in the field of aero-engine combustion test, the problem of temperature resistance and pressure resistance is not solved by adjusting the structure of the pipe itself. The design of temperature-resistant and pressure-resistant pipes is generally ensured by adjusting the wall thickness and material, and the thermal expansion of the straight pipe itself is large, which generally needs to be controlled by a corrugated pipe and a complex pipe layout design. Therefore, the local and overall calculation and optimization of the pipe need to be increased, which increases the complexity of the design. SUMMARY

[0004] In order to solve the problem of thermal expansion of high-temperature and high-pressure air in the straight pipe, the present application provides a high-temperature and high-pressure air conveying straight pipe for a gas turbine combustion tester, which comprises: A pipe outer wall is a hollow pipe structure. A pipe inner wall is nested in the pipe outer wall and forms a double-layer structure with the pipe outer wall. The pipe inner wall is a segmented hollow pipe structure, and an interface is arranged between the segmented hollow pipe structures. A support piece is supported in the interlayer between the pipe outer wall and the pipe inner wall, and a plurality of support pieces are arranged in the interlayer.

[0005] Preferably, the segmented structure of the pipe inner wall comprises: a front inner wall and a rear inner wall connected in sequence, and the interface is arranged between the front inner wall and the rear inner wall. A support piece is arranged between the front inner wall and the pipe outer wall and between the rear inner wall and the pipe outer wall.

[0006] Preferably, a welding ring is arranged at the interface. One end of the welding ring is welded to the rear inner wall, the other end of the welding ring is sleeved outside the front inner wall, and the welding ring and the front inner wall have a gap in the axial direction.

[0007] Preferably, the pipe inner wall is made of a high-temperature alloy material.

[0008] Preferably, the outer wall of the pipeline is made of pressure-bearing and non-heat-insulating material. Preferably, the support sheet is in Z-shaped structure, and the upper and lower ends of the Z-shaped structure support the outer wall and the inner wall of the pipeline respectively.

[0009] Preferably, the two ends of the support sheet connected with the inner wall and the outer wall of the pipeline are respectively chamfered to form avoiding structures.

[0010] Preferably, aerogel is filled between the outer wall and the inner wall of the pipeline.

[0011] Preferably, the thickness of the aerogel is adjusted according to different use temperatures.

[0012] Preferably, through holes are further arranged on the outer wall and the inner wall of the pipeline, and a hole probe seat is arranged on the outer side of the outer wall of the pipeline.

[0013] Compared with the prior art, the present application has the following beneficial effects: The present application provides a high-temperature and high-pressure air conveying straight pipeline for a gas turbine combustion tester, which comprises: an outer wall of the pipeline, which is a hollow pipe structure; an inner wall of the pipeline, which is nested in the outer wall of the pipeline, and the outer wall of the pipeline forms a double-layer structure; the inner wall of the pipeline is a segmented hollow pipe structure, and interfaces are arranged between the segmented hollow pipe structures; and support sheets are supported in the interlayer between the outer wall and the inner wall of the pipeline, and the support sheets are spaced apart along the interlayer. The nested arrangement of the outer wall and the inner wall of the pipeline forms a double-wall structure, which separates the problems of temperature resistance and pressure resistance, and the outer wall of the pipeline only bears pressure conditions, and the inner wall of the pipeline only bears temperature conditions. Compared with a single-layer and thick heat-resistant and pressure-resistant straight pipeline, the heat of the fluid can be controlled in the pipeline, which prevents personnel outside the pipeline from being scalded and prevents the heat inside from being lost. The segmented design of the inner wall of the pipeline can make the internal and external pressures of the internal structure consistent, concentrate thermal expansion in the inner wall of the pipeline, and eliminate the problem of outward expansion through internal absorption, so that the overall structure can adapt to different length requirements and meet the requirement of structural versatility. The support sheets arranged between the inner wall and the outer wall of the pipeline can assist the outer wall of the pipeline to bear part of the pressure, fix the segmented inner wall of the pipeline, limit the expansion of the inner wall of the pipeline to a certain range, reduce the thermal expansion of the straight pipeline, and simplify the overall design process of the pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a front sectional view of a pipeline for high-temperature and high-pressure air conveying according to the present application. Figure 2 It is a C sectional view of a pipeline for high-temperature and high-pressure air conveying according to the present application. Figure 3 A schematic view of a support sheet for a high-temperature and high-pressure air conveying pipeline of the present application; Wherein, 1-pipe outer wall, 2-previous inner wall, 3-support sheet, 4-aerogel, 5-welding ring, 6-later inner wall, 7-hole seat. DETAILED DESCRIPTION

[0015] Example 1: A high-temperature and high-pressure air conveying straight pipeline for a gas turbine combustion tester, as shown in Figure 1 and Figure 2 , comprising: A pipe outer wall 1 is a hollow tube structure; A pipe inner wall is nested in the pipe outer wall 1, and the pipe outer wall 1 forms a double-layer structure; the pipe inner wall is a sectional structure of a hollow tube structure, and an interface is provided between the sectional structure of the hollow tube structure; A support sheet 3 is supported in the interlayer of the pipe outer wall 1 and the pipe inner wall, and a plurality of support sheets 3 are provided along the interlayer.

[0016] The pipe outer wall 1 and the pipe inner wall are nested to form a double-layer structure with an inner layer and an outer layer, the outer layer of the double-layer structure, i.e. the pipe outer wall 1, is mainly used to bear the pressure of the airflow, and the inner layer of the double-layer structure, i.e. the pipe inner wall, is mainly used for heat insulation and support to ensure the stability of the heat insulation material.

[0017] The pipe inner wall is a sectional structure, which is mainly used for the airflow passing through the pipe inner wall to make the internal and external pressures of the internal structure consistent, so that the pipe inner wall can be designed very thin, which not only saves the use of high-temperature alloy materials but also reduces the overall weight of the pipe inner wall part.

[0018] The pipe inner wall is designed to expand inward, eliminating outward expansion, so that the overall structure can adapt to different length needs and meet the general requirements of the structure.

[0019] The support sheet 3 is provided in the interlayer of the pipe outer wall 1 and the pipe inner wall, and the C-directional cross-sectional view of the pipeline is as shown in Figure 1 The support sheet 3 is provided in the interlayer of the pipe outer wall 1 and the pipe inner wall, and the C-directional cross-sectional view of the pipeline is as shown in Figure 2 The plurality of support sheets 3 uniformly support the pipe inner wall, ensuring the stability of the sectional pipe inner wall, and on the other hand, the support sheet 3 can ensure the radial expansion of the sectional pipe inner wall after being heated, improving the stability of the overall structure.

[0020] The straight pipe of the application is suitable for the straight pipe general structure under the action of pressure above 2MPa and temperature above 700 DEG C, solves the problems of thermal expansion, heat loss and structure design caused by the use of the straight pipe under the high temperature and high pressure environment, reduces the use of high temperature materials, eliminates the use of the corrugated pipe in the pipe, has strong structure universality and high popularization.

[0021] Preferably, the sectional structure of the inner wall of the pipe comprises: a front inner wall 2 and a rear inner wall 6 connected in sequence, and the interface is arranged between the front inner wall 2 and the rear inner wall 6. The front inner wall 2 and the rear inner wall 6 are provided with support plates 3 between the front inner wall 2 and the pipe outer wall 1 and between the rear inner wall 6 and the pipe outer wall 1.

[0022] The interface is arranged between the front inner wall 2 and the rear inner wall 6, and the interface is used to make the internal and external pressures of the overall internal structure consistent through airflow.

[0023] The front inner wall 2 and the rear inner wall 6 are respectively provided with support plates 3 around the front inner wall 2 and the rear inner wall 6, the stability of the front inner wall 2 and the rear inner wall 6 is enhanced through the support plates 3, and the radial expansion of the front inner wall 2 and the rear inner wall 6 after being heated is ensured, and the stability of the structure is improved.

[0024] Preferably, the interface is provided with a welding ring 5. One end of the welding ring 5 is welded and connected with the rear inner wall 6, the other end of the welding ring 5 is sleeved on the outer side of the front inner wall 2, and the welding ring 5 and the front inner wall 2 leave a gap in the axial direction.

[0025] The welding ring 5 and the rear inner wall 6 are welded and connected, and the welding ring 5 and the front inner wall 2 leave a gap in the axial direction, and the gap can balance the pressure on both sides of the inner wall of the pipe on the basis of ensuring that the airflow circulation is not affected.

[0026] The front inner wall 2 and the rear inner wall 6 can freely expand to the inside of the pipe when being heated, and the expansion amount is controlled at the gap in the inside of the pipe, and the advantage of the inward expansion of the inner wall of the pipe is fully ensured.

[0027] Preferably, the inner wall of the pipe is made of high-temperature alloy material.

[0028] Preferably, the inner wall of the pipe is made of high-temperature alloy material.

[0029] Optionally, the high-temperature alloy material can also be made of alloy metal with high-temperature resistance such as nickel-based high-temperature alloy, cobalt-based high-temperature alloy, iron-nickel-based alloy or refractory metal alloy according to the working condition, so as to optimize the reliability and life of the pipe system.

[0030] Preferably, the outer wall 1 of the pipe is made of a pressure-bearing, non-insulating material.

[0031] The outer wall 1 of the pipe is made of pressure-bearing, non-insulating material, such as ordinary stainless steel. The wall thickness can be increased according to the requirements. It is used to bear the airflow pressure. Using low-priced materials to bear the pressure can save costs.

[0032] Depending on the operating conditions, the pressure-resistant, non-insulating material can also be replaced by materials with pressure-bearing capacity and low cost, such as carbon steel, aluminum and aluminum alloys or low alloy steel.

[0033] like Figure 3 As shown, the support piece 3 has a Z-shaped structure, and the upper and lower ends of the Z-shaped structure support the outer wall 1 and the inner wall of the pipe, respectively.

[0034] The two ends of the support plate 3 abut against the outer wall 1 and the inner wall of the pipe, respectively, to ensure that the inner wall of the pipe expands radially after being heated, thereby improving the overall stability of the structural domain.

[0035] The support plate 3 is made of the same high-temperature alloy material as the inner wall of the pipe, which is heat-resistant but not pressure-resistant.

[0036] Preferably, the two ends of the support piece 3 that connect to the inner wall of the pipe and the outer wall of the pipe 1 are respectively provided with oblique cuts to avoidance structures.

[0037] The two ends of the support piece 3 are asymmetrically arranged, and the avoidance structure includes: The support plate 3 extends near the upper end of the outer wall 1 of the pipe and has a beveled structure. The beveled structure is designed at a certain angle to the upper end of the support plate 3. The beveled structure abuts against the outer wall 1 of the pipe, so that the upper end of the support plate 3 and the outer wall 1 of the pipe retain a certain gap, thereby avoiding direct rigid contact and reducing the contact area. The lower end of the support piece 3 that abuts against the inner wall of the pipe is also designed to be inclined. This inclined design ensures that only the tangential part of the lower end contacts the inner wall of the pipe when it abuts, thus retaining a small gap to reduce the contact area and avoid rigid contact.

[0038] When the pipe expands due to heat, the difference in the coefficients of thermal expansion between the inner wall of the pipe, the outer wall 1 of the pipe, and the support plate 3 will cause deformation mismatch. At this time, the gap between the support plate 3 and the inner wall of the pipe or the outer wall 1 of the pipe allows the support plate 3 to move freely, avoiding plastic deformation or cracks caused by constraints.

[0039] Under fluid pulsation or external vibration loads, the support plate 3 can buffer vibration energy through tiny gaps, reducing fatigue damage. The oblique cut structure at the upper end of the support plate 3 can disperse stress concentration and improve impact resistance.

[0040] Preferably, the pipe outer wall 1 and the pipe inner wall are also filled with aerogel 4.

[0041] Preferably, the thickness of the aerogel 4 is adjusted according to the use temperature.

[0042] The prior art cools the straight pipe by using cooling water, which makes the pipe structure complex, increases the design and process costs of the pipe, and greatly increases the use cost in the later stage, so that the circulating water needs to be used for cooling each time, and more importantly, the cooling water used in the technical solution reduces the temperature of the high-temperature gas, which causes a certain temperature loss. The aerogel 4 used as a heat insulation material can effectively block the conduction of heat, and the thickness thereof is adjusted according to the use temperature.

[0043] The aerogel 4 has an ultralow thermal conductivity and can efficiently insulate heat. In a high-temperature working condition, the heat insulation layer of the aerogel 4 can reduce the temperature of the pipe outer wall 1 to below 50°C, thereby avoiding the risk of scalding and reducing the environmental heat loss. Compared with a traditional heat insulation material, the thickness of the aerogel 4 can be reduced by 50% to 70% when the same heat insulation effect is achieved. The aerogel 4 has stable high-temperature and high-pressure resistance and can withstand a high temperature of -200°C to 800°C for a long time.

[0044] Preferably, the pipe outer wall 1 and the pipe inner wall are also provided with a through hole, and the through hole is provided with a hole probe seat 7 on the outer side of the pipe outer wall 1.

[0045] The hole probe seat 7 is used for regularly checking the use of the structure inside by a hole probe instrument, so as to facilitate the maintenance and maintenance of the structure.

[0046] Embodiment 2: The application provides a high-temperature and high-pressure air conveying straight pipe for a gas turbine combustion tester, and a general structure of a straight pipe under the simultaneous action of a pressure of 2 MPa or more and a temperature of 700°C or more. The pipe is designed in a double-layer structure. The pipe outer wall 1 only bears the pressure working condition, and the pipe inner wall only bears the temperature working condition. On this basis, the inner wall is designed to expand inward to eliminate outward expansion, so that the overall structure can adapt to different length requirements and meet the general structure requirement.

[0047] The pipe inner wall structure is divided into a front inner wall 2 and a rear inner wall 6. The material is temperature-resistant stainless steel, and the wall thickness is small. The main functions are heat insulation and support, and the stability of the heat insulation material is ensured. The front inner wall 2 and the rear inner wall 6 are connected by an interface, and the airflow can pass through, so that the internal and external pressures of the overall internal structure are consistent. The inner wall can be very thin in the structure design, and the use of high-temperature alloy material is saved.

[0048] The material of the outer wall 1 of the pipe is common stainless steel, and the wall thickness is relatively increased, mainly used for bearing the pressure of air flow, and the material with low price is used for bearing the pressure, so that the cost advantage is fully reflected.

[0049] The welding ring 5 and the rear inner wall 6 are connected through welding, and a gap is left in the axial direction and the front inner wall 2, so that the pressure balance on both sides of the inner wall is realized on the basis of not affecting the circulation of air flow, and in addition, the sectional design can realize that the front inner wall 2 and the rear inner wall 6 can freely expand to the inside of the pipe when heated, so that the expansion amount is controlled at the gap in the inside of the pipe, and the inward expansion advantage of the patent is fully ensured.

[0050] The aerogel 4 can effectively block the conduction of heat, and the thickness thereof is adjusted according to different use temperatures, the thickness of the aerogel 4 in the embodiment is 45 mm, and under the circulation of air at 700 DEG C, the serial number 1 is below 140 DEG C.

[0051] Through the double-wall structure of the straight pipe, the economic structure is fully considered, the influence of the thermal expansion of the common straight pipe on the external equipment is eliminated, the air system of the complex pipe system test equipment is simplified, and the structure has high universality.

[0052] The above is only an embodiment of the application and is not used to limit the application, and any modification, equivalent replacement, improvement and the like within the spirit and principle of the application are included in the scope of the claims of the application to be approved.

Claims

1. A straight pipeline for supplying high-temperature and high-pressure air to a gas turbine combustion test apparatus, characterized in that, include: The outer wall of the pipe (1) is a hollow pipe structure; The inner wall of the pipe is nested within the outer wall of the pipe (1) and forms a double-layer structure with the outer wall of the pipe (1); the inner wall of the pipe is a segmented hollow pipe structure, and the segments of the hollow pipe structure are provided with interfaces; Supporting pieces (3) are supported in the interlayer between the outer wall (1) of the pipe and the inner wall of the pipe, and multiple supporting pieces (3) are provided at intervals along the interlayer.

2. The high-temperature and high-pressure air delivery straight pipeline for a gas turbine combustion test apparatus as described in claim 1, characterized in that, The segmented structure of the inner wall of the pipe includes: a front inner wall (2) and a rear inner wall (6) connected in sequence, and the interface is disposed between the front inner wall (2) and the rear inner wall (6); Support plates (3) are provided between the front inner wall (2) and the outer wall (1) of the pipe, and between the rear inner wall (6) and the outer wall (1) of the pipe.

3. A high-temperature, high-pressure air delivery straight pipeline for a gas turbine combustion test apparatus as described in claim 2, characterized in that, A welding ring (5) is provided at the interface; One end of the welding ring (5) is welded to the rear inner wall (6), and the other end of the welding ring (5) is sleeved on the outside of the front inner wall (2). The welding ring (5) and the front inner wall (2) have a gap in the axial direction.

4. A high-temperature, high-pressure air delivery straight pipeline for a gas turbine combustion test apparatus as described in claim 2, characterized in that, The inner wall of the pipe is made of high-temperature alloy material.

5. A high-temperature, high-pressure air delivery straight pipeline for a gas turbine combustion test apparatus as described in claim 1, characterized in that, The outer wall of the pipeline (1) is made of pressure-bearing, non-insulating material.

6. A high-temperature, high-pressure air delivery straight pipeline for a gas turbine combustion test apparatus as described in claim 1, characterized in that, The support piece (3) has a Z-shaped structure, and the upper and lower ends of the Z-shaped structure support the outer wall (1) of the pipe and the inner wall of the pipe, respectively.

7. A high-temperature, high-pressure air delivery straight pipeline for a gas turbine combustion test apparatus as described in claim 6, characterized in that, The two ends of the support piece (3) that connect to the inner wall of the pipe and the outer wall of the pipe (1) are respectively provided with oblique cuts to avoidance structures.

8. A high-temperature, high-pressure air delivery straight pipeline for a gas turbine combustion test apparatus as described in claim 1, characterized in that, Aerogel (4) is also filled between the outer wall (1) and the inner wall of the pipe.

9. A high-temperature, high-pressure air delivery straight pipeline for a gas turbine combustion test apparatus as described in claim 8, characterized in that, The thickness of the aerogel (4) is adjusted according to the different operating temperatures.

10. A high-temperature, high-pressure air delivery straight pipeline for a gas turbine combustion test apparatus as described in claim 1, characterized in that, The outer wall (1) and the inner wall of the pipe are also provided with through holes, and the through holes are provided with a hole probe seat (7) on the outside of the outer wall (1) of the pipe.

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