CN219159065U - Exhaust diffuser section of gas turbine unit - Google Patents

Abstract

The utility model relates to the technical field of gas turbine units, in particular to the exhaust diffusion section of the gas turbine unit, which includes a horizontally arranged outlet transition pipe, the outlet transition pipe is a tapered structure, and the outside of the outlet transition pipe is wrapped with a detachable flexible partition. The thermal sleeve, the outer wrapping of the first detachable flexible heat insulation sleeve is the second detachable flexible heat insulation sleeve, and the second detachable flexible heat insulation sleeve is along the first detachable flexible heat insulation sleeve. The rounded sides of the heat shield line up. In this scheme, an outlet transition pipe is arranged between the exhaust port of the gas turbine unit and the exhaust transition section. The outlet transition pipe has a tapered structure, which increases the area of the flow channel, reduces the flow rate of the exhaust gas, and effectively reduces the exhaust pressure loss. Thereby improving the overall performance of the gas turbine.

Description

Exhaust diffuser section of gas turbine unit

technical field

The utility model relates to the technical field of gas turbine units, in particular to an exhaust diffusion section of the gas turbine unit.

Background technique

When the gas turbine is running, the loss of exhaust pressure will have adverse effects on the performance of the gas turbine, such as the decrease of power and economy, the increase of fuel consumption, etc. The loss of exhaust pressure includes the loss of resistance along the way and the loss of local resistance, of which the loss of resistance along the way is It is related to the roughness of the material and the exhaust flow rate, and the local resistance loss is related to the shape of the channel and the exhaust flow rate. Therefore, reducing the exhaust flow rate will effectively reduce the exhaust pressure loss, thereby improving the overall performance of the gas turbine.

Therefore, in order to solve the above problems, the exhaust diffuser section of the gas turbine unit is proposed

Utility model content

The purpose of the utility model is to solve the shortcomings in the prior art, and propose an exhaust diffusion section of a gas turbine unit.

In order to achieve the above purpose, the technical solution adopted by the utility model is: the exhaust diffusion section of the gas turbine unit includes a horizontally arranged outlet transition pipe, the outlet transition pipe is a tapered structure, and the outer wrapping of the outlet transition pipe can be disassembled type flexible heat insulation sleeve, the outer wrapping of the first detachable flexible heat insulation sleeve is the second detachable flexible heat insulation sleeve, and the second detachable flexible heat insulation sleeve is along the first detachable flexible heat insulation sleeve Circular side arrangement of fitted flexible insulation sleeves.

Preferably, both ends of the outlet transition pipe are connected to the gas turbine outlet expansion joint and exhaust transition section through mounting flanges.

Preferably, the bottom of the outlet transition pipe is welded with a vertical reinforcement plate, one end of the reinforcement plate penetrates the surface of the detachable flexible heat insulation sleeve and extends below it, and one end of the reinforcement plate is welded with a fixed Support, the bottom end of the fixed support is fixed with a limit block through screws, and the bottom end of the limit block is welded with a bracket.

Preferably, the fixed support and the bracket are made of the same material, which is Q235 carbon steel.

Preferably, the material of the outlet transition pipe is 06Cr18Ni11Ti.

Preferably, the taper angle of the outlet transition pipe is 14 degrees.

Compared with the prior art, the utility model has the following beneficial effects:

In this scheme, an outlet transition pipe is arranged between the exhaust port of the gas turbine unit and the exhaust transition section. The outlet transition pipe has a tapered structure, which increases the area of the flow channel, reduces the flow rate of the exhaust gas, and effectively reduces the exhaust pressure loss. Thereby improving the overall performance of the gas turbine;

In this scheme, the first detachable flexible heat insulation sleeve and the second detachable flexible heat insulation sleeve are arranged outside the outlet transition pipe, and the first detachable flexible heat insulation sleeve and the second detachable flexible heat insulation sleeve The heat insulation sleeve is used to avoid the loss of the temperature of the exhaust gas entering the transition pipe at the outlet, and has the effect of heat preservation on the temperature of the exhaust gas, improves the gas efficiency of the exhaust gas, reduces the emission of the exhaust gas, further reduces the exhaust pressure loss, and further improves the overall performance of the gas turbine. performance.

Description of drawings

Fig. 1 is a schematic diagram of a half-section of the utility model;

Fig. 2 is the structural representation of the outlet transition section of the utility model;

Fig. 3 is a schematic cross-sectional view of the support position of the outlet transition section of the present invention;

Fig. 4 is the schematic diagram of the support structure of the present utility model;

Fig. 5 is a schematic diagram of the outlet transition section support and bracket sliding support of the present invention.

In the figure: outlet transition pipe 1, first detachable flexible heat insulation sleeve 2, second detachable flexible heat insulation sleeve 3, bracket 4, reinforcement plate 5, fixed support 6, limit block 7.

Detailed ways

The following description is used to disclose the utility model so that those skilled in the art can realize the utility model. The preferred embodiments described below are only examples, and those skilled in the art can devise other obvious variations.

The exhaust diffusion section of the gas turbine unit shown in Figure 1-5 includes a horizontal outlet transition pipe 1, the outlet transition pipe 1 is a tapered structure, and the two ends of the outlet transition pipe 1 pass through the installation flange and the gas turbine outlet expansion joint It is connected with the exhaust transition section; the taper angle of the outlet transition pipe 1 is 14 degrees. Under this angle, there will be a small pressure loss, and at the same time reduce the exhaust flow rate, which is more practical; the material of the outlet transition pipe 1 is 06Cr18Ni11Ti , that is, it can ensure the continuous operation of the exhaust diffusion section at the design limit temperature of 600°C, and also ensure that it has good mechanical properties and a better structure at this temperature.

The outlet transition pipe 1 wraps the detachable flexible heat insulation sleeve 2 outside, the first detachable flexible heat insulation sleeve 2 wraps the second detachable flexible heat insulation sleeve 3, and the second detachable flexible heat insulation sleeve 3 The heat sleeve 3 is arranged along the circular side of the first detachable flexible heat insulation sleeve 2; the first detachable flexible heat insulation sleeve 2 and the second detachable flexible heat insulation sleeve 3 are made of the same material, The first detachable flexible heat insulation cover 2 consists of three layers, the inner layer is made of high-silica glass fiber cloth, the middle layer is made of nano-airgel felt and high-silica glass fiber cotton, and the outer layer is made of Teflon cloth; Avoid the loss of exhaust gas temperature in the transition pipe at the outlet, keep the temperature of the exhaust gas warm, improve the gas efficiency of the exhaust gas, reduce the emission of exhaust gas, further reduce the loss of exhaust pressure, and further improve the overall performance of the gas turbine.

The bottom of the outlet transition pipe 1 is welded with a vertical reinforcement plate 5, one end of the reinforcement plate 5 runs through the surface of the detachable flexible heat insulation sleeve 2 and extends below it, and one end of the reinforcement plate 5 is welded with a fixed support 6, fixed The bottom end of the support 6 is installed with a limit block 7 by screws, and the bottom end of the limit block 7 is welded with a bracket 4; the material of the fixed support 6 and the bracket 4 is the same, and the material is Q235 carbon steel; through the limit block 7 on the bracket 4 To prevent the fixed support 6 from moving left and right, so as to ensure the sliding support for the axial displacement of the outlet transition pipe 1 due to the thermal expansion of the metal after heating, improve the stability of the outlet transition pipe 1, and have stronger functionality.

Working principle: When installing the exhaust diffusion section, the small-area flange port of the outlet transition pipe 1 is connected to the exhaust expansion joint of the gas turbine through bolts, and the large-area flange port of the outlet transition pipe 1 is connected to the exhaust transition section. , the outlet transition pipe 1 gradually increases the passage area through the tapered structure, thereby gradually reducing the exhaust flow rate. After completing the connection of the outlet transition pipe 1, cover the first detachable flexible heat insulation sleeve 2 on the outlet transition pipe 1 to achieve the effect of heat insulation, and then cover the second detachable flexible heat insulation sleeve 3 on the removable The detachable flexible heat insulation sleeve 2 is located outside the gas turbine casing, and is used to seal the gap between the gas turbine casing and the outlet transition pipe 1 to achieve heat insulation and prevent gas leakage;

When the outlet transition pipe is in place, the fixed support 6 should be placed on the support 4, and the fixed support 6 should be placed between the two limit blocks 7 on the support 4. When the gas turbine is running normally, the exhaust diffusion section will be heated Due to axial thermal expansion, the fixed support 6 will produce axial displacement on the support 4. The axial length of the support 4 is greater than the axial length of the fixed support 6, so as to ensure that the fixed support 6 is completely compatible with the exhaust gas diffusion section when it is heated and expanded. Bracket 4 contacts.

The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the industry should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions describe only the principle of the utility model. There will be various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The protection scope required by the utility model is defined by the appended claims and their equivalents.

Claims (6)

1. The exhaust diffusion section of the gas turbine unit comprises an outlet transition pipe (1) which is horizontally arranged, and is characterized in that: the outlet transition pipe (1) is of a conical structure, the first detachable flexible heat insulation sleeve (2) is wrapped outside the outlet transition pipe (1), the second detachable flexible heat insulation sleeve (3) is wrapped outside the first detachable flexible heat insulation sleeve (2), and the second detachable flexible heat insulation sleeve (3) is arranged along the round side edge of the first detachable flexible heat insulation sleeve (2).

2. The exhaust gas diffusion section of a gas turbine unit according to claim 1, characterized in that both ends of the outlet transition pipe (1) are connected with the gas turbine outlet expansion joint and the exhaust gas transition section by mounting flanges.

3. The exhaust diffusion section of a gas turbine unit according to claim 1, characterized in that a reinforcing plate (5) is welded at the bottom of the outlet transition pipe (1), one end of the reinforcing plate (5) penetrates through the surface of the detachable flexible heat insulation sleeve (2) and extends to the lower side of the reinforcing plate, a fixed support (6) is welded at one end of the reinforcing plate (5), a limiting block (7) is mounted at the bottom end of the fixed support (6) through a screw, and a bracket (4) is welded at the bottom end of the limiting block (7).

4. An exhaust gas diffusion section of a gas turbine unit according to claim 3, wherein the fixed support (6) and the bracket (4) are made of the same material and are made of Q235 carbon steel.

5. The exhaust gas diffusion section of a gas turbine unit according to claim 1, wherein the outlet transition pipe (1) is made of 06Cr18Ni11Ti.

6. The exhaust gas diffusion section of a gas turbine unit according to claim 1, characterized in that the angle of taper of the outlet transition duct (1) is 14 degrees.

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