Supporting structure of inner baffle plate in exhaust gas inlet of gas turbine waste heat boiler

Abstract

The utility model relates to a kind of gas turbine waste heat boiler inlet flue inner guard plate support structure, belong to waste heat boiler equipment technical field.The utility model includes outer guard plate, inner guard plate, the heat insulation cotton filled between outer guard plate and inner guard plate and the support nail of several even distribution in inner guard plate, support nail bottom and outer guard plate inner wall are welded, still include the support beam fixed in inner guard plate inner wall, support nail upper end portion is connected with support beam to constitute the T type support structure of supporting inner guard plate.The utility model is set up support beam on the position of bolt in inner guard plate, not only can increase the contact area with heat insulation cotton, more effectively compact heat insulation cotton, inner guard plate of inlet flue can also be significantly enhanced the support strength of inner guard plate, avoid the problem that inner guard plate is in because of high parameter flue gas scouring and produces concave deformation.

Description

Technical Field

[0001] This utility model relates to a support structure for the inner lining plate of the inlet flue of a gas turbine waste heat boiler, belonging to the technical field of waste heat boiler equipment. Background Technology

[0002] In large-scale gas turbine combined cycle units, the waste heat boiler is a key piece of equipment for recovering waste heat from gas turbine exhaust and producing steam to achieve combined cycle power generation. As the starting point of the waste heat boiler, the inlet flue directly bears the high-temperature, high-flow-rate gas turbine exhaust. Its internal liner support structure has a crucial impact on the stable operation, thermal efficiency, and lifespan of the entire waste heat boiler. A typical waste heat boiler's internal liner support structure is shown in the attached figure. Figure 1 The system mainly consists of an outer protective plate 1, an inner protective plate 2, insulation cotton 3, and insulation support nails 5. The insulation cotton 3, as the core insulation material, minimizes heat loss, maintains the internal temperature of the waste heat boiler, and improves energy utilization efficiency. The inner protective plate 2 mainly protects the insulation cotton and withstands the scouring of high-temperature flue gas. The insulation support nails 5 are evenly distributed between the inner protective plate 2 and the outer protective plate 1, serving to connect and support the inner protective plate 2, ensuring its stability under complex operating conditions. However, in recent years, with the development and operation of large-scale gas turbine-combined cycle units, the exhaust gas temperature of the gas turbine has become increasingly higher, and the exhaust volume has increased accordingly. The impact of flue gas on the inner protective plate of the waste heat boiler inlet flue has also increased. The traditional support structure of the inner protective plate is prone to inward deformation under the impact of flue gas. After deformation, the insulation cotton is easily compressed, leading to a decrease in the insulation performance of the insulation cotton. Over time, the inner insulation is very likely to fail, causing the outer protective plate to overheat. This not only affects the normal operation of the waste heat boiler but may also bring safety hazards.

[0003] To address this issue, the applicant has improved the support structure for the inner lining plate of the inlet flue of a gas turbine waste heat boiler, in order to improve the problem of inward deformation of the inner lining plate caused by high-parameter flue gas scouring. Summary of the Invention

[0004] The present invention mainly addresses the problem in the prior art where the inner lining support structure is prone to inward deformation under the impact of flue gas, leading to a decrease in the thermal insulation performance of the insulation cotton and overheating of the outer lining. It provides a support structure that is simple, reliable, easy to implement, and can enhance the support strength of the inner lining of the inlet flue and improve its resistance to deformation.

[0005] The present invention addresses the aforementioned technical problems primarily through the following technical solution: the present invention comprises an outer protective plate, an inner protective plate, insulation cotton filled between the outer and inner protective plates, and several support nails evenly distributed on the inner protective plate. The bottom of the support nails is welded to the inner wall of the outer protective plate. The invention also includes a support beam fixed to the inner wall of the inner protective plate, with the upper end of the support nails connected to the support beam to form a T-shaped support structure supporting the inner protective plate.

[0006] Preferably, the upper end of the support nail has an external thread that passes through the support beam and the inner protective plate and is threaded to the nut, and a washer is provided between the nut and the inner protective plate.

[0007] Preferably, the support beam has two or more through holes through which the upper ends of two or more corresponding support nails can pass, and the center distance between two adjacent through holes is equivalent to the center distance between adjacent support nails.

[0008] Preferably, the through hole is a waist-shaped hole.

[0009] As a preferred option, the support beam is made of angle steel.

[0010] As a preferred option, the support beam is made of stainless steel.

[0011] This utility model has a simple structure and the following advantages:

[0012] This invention provides a support beam at the location where the support nails are set on the inner side of the inner liner. The support beam and the support nails form a T-shaped structure to jointly support the inner liner, which greatly enhances the overall strength and deformation resistance of the inner liner, making it less prone to inward deformation under strong flue gas scouring.

[0013] Furthermore, the upper end of the support nail is connected to the inner protective plate by a threaded connection, which facilitates the installation and disassembly of the support structure.

[0014] Furthermore, the length of the support beam and the through holes can be determined based on the distribution of the support nails on the inner liner.

[0015] Furthermore, the through holes of the support beam are of the waist-shaped type, which can not only ensure the positioning and fixation of the support beam, but also meet the thermal expansion requirements during unit operation.

[0016] Furthermore, the support beams are made of stainless steel angle steel, which provides stable and uniform support for the inner liner through its rigidity. The stainless steel material ensures that it still has good strength in high-temperature environments, meeting the requirements for long-term stable operation of the waste heat boiler. At the same time, the angle steel can more effectively compress the insulation cotton, thereby avoiding the problem of the insulation cotton becoming loose or shifting due to vibration, airflow disturbance and other factors during operation, thus ensuring the stable insulation performance of the insulation cotton.

[0017] Therefore, this utility model can provide stable and uniform support for the inner lining plate of the flue, greatly enhance the deformation resistance of the inner lining plate during the operation of the waste heat boiler, and at the same time, it can also compress the insulation cotton to make it better fixed, thereby ensuring the stable insulation performance of the insulation cotton. Attached Figure Description

[0018] Appendix Figure 1 This is a schematic diagram of the existing technology structure;

[0019] Appendix Figure 2 This is a schematic diagram of a preferred embodiment of the present invention;

[0020] Appendix Figure 3 This is a schematic diagram of the support beam in a preferred embodiment of the present invention.

[0021] Explanation of reference numerals in the attached drawings: Outer protective plate 1; Inner protective plate 2; Insulation cotton 3; Support beam 4; Support nail 5; Nut 51; External thread 52; Through hole 6; Washer 7. Detailed Implementation

[0022] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0023] Example 1: As shown in the attached document Figure 2 Appendix Figure 3 As shown, this utility model includes an outer protective plate 1, an inner protective plate 2, and thermal insulation cotton 3 filled between the outer protective plate 1 and the inner protective plate 2. The inner protective plate 2 is welded to the inner side of the outer protective plate 1 by a number of evenly distributed support nails 5.

[0024] The support beam 4 is an angle steel made of stainless steel. A through hole 6, which is a waist-shaped hole, is made on the support beam 4 according to the position of the support nail 5, and it is fixed to the inner wall of the inner guard plate 2.

[0025] The upper end of the support nail 5 has an external thread 52, which passes through the support beam 4 and the inner protective plate 2 and is threaded to the nut 51. A washer 7 is provided between the nut 51 and the inner protective plate 2.

[0026] The length of the support beam 4 and the location of the waist-shaped holes are determined based on the distribution of the support nails 5.

[0027] When this invention is applied to a flue, firstly, support nails 5 are installed on the already installed and fixed outer protective plate 1. Each support nail 5 is welded and fixed to the inner wall of the outer protective plate 1 according to a set position. Then, insulation cotton 3 is laid and fills the space between the outer protective plate 1 and the inner protective plate 2. According to the number and layout of the support nails 5, an angle steel of appropriate length is selected as a support beam 4, and through holes 6 are opened at the positions corresponding to the support nails 5. The support beam 4 is fitted onto the upper end of the support nail 5 through the through holes 6, with its protruding side facing the insulation cotton 3. Then, the inner protective plate 2 is installed and fixed. The upper end of the support nail 5 passes through the through hole 6, the gasket 7, and the inner protective plate 2, and is tightened with the nut 51 through the external thread 52. The angle steel below the inner protective plate 2 and the support nail 5 together form a T-shaped support structure. The through hole 6 is a waist-shaped hole. The thermal expansion is released by the displacement of the support nail 5 along the waist-shaped hole. The insulation cotton 3 is pressed by the support beam 4. In subsequent operation, even if it is subjected to vibration or airflow disturbance, the insulation cotton 3 is not easy to loosen or shift, which effectively ensures the insulation performance of the insulation cotton 3.

[0028] Of course, the above-described drawings and embodiments are only for explaining and illustrating this utility model, and should not be construed as improperly limiting this utility model. All technical solutions obtained by those skilled in the art through equivalent adjustments and variations based on this utility model fall within the protection scope of this utility model.

Claims

1. A support structure for the inner lining plate of the inlet flue of a gas turbine waste heat boiler, comprising an outer lining plate (1), an inner lining plate (2), insulation cotton (3) filling the space between the outer lining plate (1) and the inner lining plate (2), and a plurality of support nails (5) evenly distributed on the inner lining plate (2), wherein the bottom of the support nails (5) is welded to the inner wall of the outer lining plate (1), characterized in that, It also includes a support beam (4) fixed to the inner wall of the inner protective plate (2), and the upper end of the support nail (5) is connected to the support beam (4) to form a T-shaped support structure supporting the inner protective plate (2).

2. The inner lining plate support structure of the inlet flue of a gas turbine waste heat boiler according to claim 1, characterized in that: The upper end of the support nail (5) is provided with an external thread (52) and passes through the support beam (4) and the inner protective plate (2) to be threadedly connected to the nut (51). A washer (7) is provided between the nut (51) and the inner protective plate (2).

3. The inner lining plate support structure of the inlet flue of a gas turbine waste heat boiler according to claim 2, characterized in that: The support beam (4) has two or more through holes (6) through which the upper ends of two or more corresponding support nails (5) can pass. The center distance between two adjacent through holes (6) is equivalent to the center distance between adjacent support nails (5).

4. The inner lining plate support structure of the inlet flue of a gas turbine waste heat boiler according to claim 3, characterized in that: The through hole (6) is a waist-shaped hole.

5. The inner lining plate support structure of the inlet flue of a gas turbine waste heat boiler according to claim 4, characterized in that: The supporting beam (4) is an angle steel.

6. The inner lining plate support structure of the inlet flue of a gas turbine waste heat boiler according to claim 4, characterized in that: The supporting beam (4) is made of stainless steel.

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