Marine gas turbine test bench exhaust system and exhaust method

Abstract

The present invention relates to a smoke exhaust system and method for a marine gas turbine test bench, comprising an interconnected smoke inlet pipe group and a smoke exhaust tower, wherein the smoke inlet pipe group comprises: a first smoke inlet pipe, whose smoke inlet is larger than the smoke outlet; a smoke inlet elbow pipe, a vertically adjustable straight pipe section connected to the first smoke inlet pipe; a smoke inlet straight pipe, a horizontally adjustable straight pipe section connected to the smoke inlet elbow, the smoke inlet straight pipe connected to the bottom of the smoke exhaust tower; the smoke exhaust tower comprises: an exhaust tower and an expansion area, the expansion area being located near the exhaust tower near the smoke inlet straight pipe, the cross-sectional dimensions of the expansion area along the smoke flow direction being larger than the cross-sectional dimensions of the exhaust tower. The present invention meets the induced cooling air requirements of the box body by connecting the round-square pipe to the exhaust pipeline; and achieves the purpose of reducing pressure and noise by adding the expansion area to the exhaust tower.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbines, and in particular to a smoke exhaust system and a smoke exhaust method for a marine gas turbine test bench. Background Art

[0002] Gas turbines, as high-speed rotating power equipment, are widely used in marine propulsion and power generation. During test bench operation, marine gas turbines require a smoke exhaust system to meet exhaust requirements. Furthermore, the system must ensure natural draft ventilation within the enclosure and minimize exhaust pressure to improve thermal efficiency. Summary of the Invention

[0003] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides a rationally structured marine gas turbine test bench exhaust system and exhaust method. By using a round-the-sky-square-shaped contraction pipe section to connect the gas turbine casing and the straight pipe section, the demand for induced cooling air for the casing is met; by using an exhaust tower with expansion space, the demand for pressure reduction and noise reduction is met.

[0004] The technical solutions adopted in the present invention are as follows:

[0005] A smoke exhaust system for a marine gas turbine test bench includes a smoke inlet pipe group and a smoke exhaust tower that are interconnected. The smoke inlet pipe group includes:

[0006] The first smoke inlet pipe has a larger smoke inlet than the smoke outlet.

[0007] The flue gas flows into the elbow, which is connected to the first flue gas inlet pipe by a vertically adjusted straight pipe section.

[0008] The flue gas flows into the straight pipe, and there is a horizontal adjustment straight pipe section between the flue gas flow into the elbow pipe. The flue gas flow into the straight pipe is connected to the bottom of the exhaust tower.

[0009] The smoke exhaust tower comprises:

[0010] The exhaust tower is connected to the flue gas inlet straight pipe.

[0011] The expansion area is located in the exhaust tower near the flue gas inflow straight pipe, and the cross-sectional size of the expansion area along the flue gas flow direction is larger than the cross-sectional size of the exhaust tower.

[0012] As a further improvement of the above technical solution:

[0013] The expansion area is arranged to protrude outward from the side wall of the exhaust tower.

[0014] The expansion area and the smoke inlet straight pipe are respectively located on both sides of the exhaust tower.

[0015] A buffer distance is reserved between the communication position of the flue gas inflow straight pipe and the exhaust tower and the bottom of the exhaust tower.

[0016] The expansion area is set in a cube shape, and the dimensions of the expansion area are: length greater than or equal to 8 meters, width greater than or equal to 5 meters; height greater than or equal to 7 meters.

[0017] The vertical adjustment section straight pipe section is used to adjust the installation requirements of the gas turbine exhaust end and the test bench exhaust tower inlet height; the horizontal adjustment straight pipe section is used to adjust the installation requirements of the gas turbine exhaust end and the test bench exhaust tower inlet horizontal length.

[0018] The first flue gas inlet pipe adopts a round square pipe, the square pipe mouth of the first flue gas inlet pipe is connected to the gas turbine casing, and the round pipe mouth of the first flue gas inlet pipe is connected to the flue gas inlet elbow.

[0019] The diameter of the gas outlet of the gas turbine casing is smaller than the diameter of the circular tube opening of the first flue gas inlet pipe.

[0020] The flue gas inflow straight pipe adopts a round pipe with a square shape. The round pipe mouth of the flue gas inflow straight pipe is connected to the horizontal adjustment straight pipe section, and the square pipe mouth of the flue gas inflow straight pipe is connected to the exhaust tower.

[0021] A smoke exhaust method using a smoke exhaust system of a marine gas turbine test bench comprises the following steps:

[0022] After passing through the first flue gas inlet pipe, the flue gas inlet elbow pipe, and the flue gas inlet straight pipe, the flue gas enters the bottom of the exhaust tower. At this time, the flue gas moves perpendicular to the exhaust tower and enters the exhaust tower.

[0023] After entering the exhaust tower, the flue gas continues to flow forward until it hits the side wall of the expansion area and flows upward along the side wall. A small amount of flue gas is buffered at the bottom of the exhaust tower. The upward-flowing flue gas forms a semi-annular smoke flow in the expansion area. At this time, the flow rate of the flue gas is greatly reduced, and the smoke inlet pressure becomes smaller in the expansion area. When the flue gas enters the exhaust tower upward, the flue gas flow rate is stable and the flow field is uniform. It is not easy for subsequent flue gas to push the preceding flue gas to form turbulence, thereby achieving the purpose of reducing pressure and noise.

[0024] The beneficial effects of the present invention are as follows:

[0025] The present invention has a compact and reasonable structure. By connecting the round and square pipes to the exhaust pipeline, the cooling air requirements of the box body can be met. By adding an expansion area at the exhaust tower, the purpose of reducing pressure and noise can be achieved.

[0026] In the present invention, the structure is round and square, the lower part is a square structure connected to the box body outlet, and the upper part is a round structure. The center line of the round is coaxial with the center line of the exhaust outlet of the gas turbine. The diameter of the round is 1600mm, and the outlet diameter of the gas turbine is 1330mm. The difference in diameter between the two mouths of this structure can make the gas turbine box body eject higher cooling air, meeting the cooling needs of the box body.

[0027] In the present invention, the function of the expansion zone is to provide a larger buffer space at the bottom of the exhaust tower, so that the flow rate of the flue gas after entering the expansion zone is slowed down, the exhaust pressure of the gas turbine is reduced, and the thermal efficiency of the gas turbine is improved. At the same time, it can ensure that the flue gas flows out of the flue evenly, so as to achieve the effect of reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the smoke exhaust system of the present invention.

[0029] Figure 2 This is a flow field diagram inside the smoke exhaust tower during use of the smoke exhaust system of the present invention.

[0030] Wherein: 1. Smoke exhaust tower; 2. First flue gas inlet pipe; 3. Vertical adjustment straight pipe section; 4. Flue gas inlet elbow; 5. Flue gas inlet straight pipe; 6. Horizontal adjustment straight pipe section; 7. Gas turbine housing;

[0031] 101. Exhaust tower; 102. Expansion area. DETAILED DESCRIPTION

[0032] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0033] like Figure 1 and Figure 2 As shown, the exhaust system of the marine gas turbine test bench of this embodiment includes a smoke inlet pipe group and a smoke exhaust tower 1 that are interconnected. The smoke inlet pipe group includes:

[0034] The first flue gas flows into the pipe 2, whose smoke inlet is larger than the smoke outlet.

[0035] The flue gas flows into the elbow 4, which is connected to the first flue gas inlet pipe 2 by a vertical adjustment straight pipe section 3.

[0036] The flue gas flows into the straight pipe 5, and a horizontal adjustment straight pipe section 6 is connected between the flue gas flow into the elbow pipe 4. The flue gas flow into the straight pipe 5 is connected to the bottom of the exhaust tower 1.

[0037] Smoke exhaust tower 1 includes:

[0038] The exhaust tower 101 is connected to the flue gas inlet straight pipe 5.

[0039] The expansion area 102 is located in the exhaust tower 101 near the flue gas inlet straight pipe 5 . The cross-sectional dimension of the expansion area 102 along the flue gas flow direction is larger than the cross-sectional dimension of the exhaust tower 101 .

[0040] The expansion area 102 protrudes outward from the side wall of the exhaust tower 101.

[0041] The expansion area 102 and the flue gas inlet straight pipe 5 are respectively located on both sides of the exhaust tower 101.

[0042] A buffer distance is reserved between the communication position between the flue gas inflow straight pipe 5 and the exhaust tower 101 and the bottom of the exhaust tower 101.

[0043] The expansion area 102 is configured in a cube shape, and the dimensions of the expansion area 102 are: a length greater than or equal to 8 meters, a width greater than or equal to 5 meters, and a height greater than or equal to 7 meters.

[0044] The vertical adjustment section of the straight pipe is used to adjust the installation requirements of the gas turbine exhaust end and the inlet height of the test bench exhaust tower 101; the horizontal adjustment section of the straight pipe 6 is used to adjust the installation requirements of the horizontal length of the gas turbine exhaust end and the inlet of the test bench exhaust tower 101.

[0045] The first flue gas inlet pipe 2 adopts a round square pipe, the square pipe mouth of the first flue gas inlet pipe 2 is connected to the gas turbine casing, and the round pipe mouth of the first flue gas inlet pipe 2 is connected to the flue gas inlet elbow 4.

[0046] The diameter of the gas outlet of the gas turbine casing is smaller than the diameter of the circular tube opening of the first flue gas inlet pipe 2 .

[0047] The flue gas inlet straight pipe 5 adopts a round tube with a square shape. The round tube mouth of the flue gas inlet straight pipe 5 is connected to the horizontal adjustment straight pipe section 6, and the square tube mouth of the flue gas inlet straight pipe 5 is connected to the exhaust tower 101.

[0048] The smoke exhaust method using the exhaust system of a marine gas turbine test bench of this embodiment includes the following steps:

[0049] After passing through the first flue gas inlet pipe 2, the flue gas inlet elbow 4, and the flue gas inlet straight pipe 5, the flue gas enters the bottom of the exhaust tower 101. At this time, the flue gas moves perpendicular to the exhaust tower 101 and enters the exhaust tower 101.

[0050] After entering the exhaust tower 101, the flue gas continues to flow forward until it hits the side wall of the expansion area 102, and flows upward along the side wall. A small amount of flue gas is buffered at the bottom of the exhaust tower 101; the upward-flowing flue gas forms a semi-annular flue gas in the expansion area 102. At this time, the flow rate of the flue gas is greatly reduced, and the smoke inlet pressure becomes smaller in the expansion area 102. When the flue gas enters the exhaust tower 101 upward, the flue gas flow rate is stable and the flow field is uniform. It is not easy for subsequent flue gas to push the preceding flue gas to form turbulence, thereby achieving the purpose of reducing pressure and noise.

[0051] The specific structure and working principle of the present invention are as follows:

[0052] like Figure 1 As shown, the lower part of the first flue gas inlet pipe 1 is a square opening, which is connected to the gas turbine casing 7, and the upper circular opening of the first flue gas inlet pipe 1 is connected to the first flue gas inlet pipe 2. The first flue gas inlet pipe 2 can meet the cooling and induced air requirements of the casing; the first flue gas inlet pipe 2 is connected to the vertically adjusted straight pipe section 3.

[0053] The flue gas inlet elbow 4 is a 90° elbow, the outlet of the flue gas inlet elbow 3 is connected to the horizontal adjustment straight pipe section 6, and the inlet of the flue gas inlet elbow 4 is connected to the vertical adjustment straight pipe section 3; the horizontal adjustment straight pipe section 6 and the vertical adjustment straight pipe section 3 are used to adjust the horizontal and vertical lengths to meet the installation dimension requirements between the gas turbine casing 7 and the exhaust tower 101; the flue gas inlet elbow 4 converts the flue gas from the vertical direction to the horizontal direction.

[0054] The above pipelines are all made of 600℃ resistant metal materials to meet the exhaust temperature resistance requirements.

[0055] The smoke exhaust tower 1 of type B is made of reinforced concrete and has a type B structure. Refractory bricks are laid inside. An expansion and pressure reduction space, namely, the expansion area 102, is provided at the bottom of the type B smoke exhaust tower 1. After the smoke enters the expansion area 102, the flow rate and pressure of the smoke are reduced. The expansion area 102 guides the smoke, and the smoke flows out of the flue evenly. The flow field is uniform and the turbulence is less, so as to achieve the effect of reducing noise; finally, the smoke is discharged from the top.

[0056] Compared with conventional exhaust systems, the present invention can reduce the exhaust pressure of the gas turbine and reduce the exhaust noise, while meeting the demand for induced cooling air of the box body.

[0057] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any modifications may be made within the scope of protection of the present invention.

Claims

1. A smoke exhaust system for a marine gas turbine test bench, comprising a smoke inlet pipe group and a smoke exhaust tower (1) interconnected with each other, characterized in that: The smoke inlet pipe group includes: The first flue gas inlet pipe (2) has a flue gas inlet larger than the flue gas outlet. The diameter difference between the two openings of this structure enables the gas turbine casing to eject cooling air to meet the casing cooling needs. The flue gas flows into the curved pipe (4), which is connected to the first flue gas inlet pipe (2) by a vertically adjustable straight pipe section (3). The smoke gas flows into the straight pipe (5), and a horizontal adjustment straight pipe section (6) is connected to the smoke gas flow into the curved pipe (4). The smoke gas flow into the straight pipe (5) is connected to the bottom of the smoke exhaust tower (1). The smoke exhaust tower (1) of type B is made of reinforced concrete and is made into a type B structure. The smoke exhaust tower (1) comprises: The exhaust tower (101) is connected to the flue gas inlet straight pipe (5), The expansion area (102) is located near the exhaust tower (101) where the flue gas flows into the straight pipe (5). The cross-sectional dimension of the expansion area (102) along the flue gas flow direction is larger than the cross-sectional dimension of the exhaust tower (101). The smoke exhaust method includes the following steps: After passing through the first flue gas inlet pipe (2), the flue gas inlet elbow pipe (4), and the flue gas inlet straight pipe (5), the flue gas enters the bottom of the exhaust tower (101). At this time, the flue gas moves perpendicularly to the exhaust tower (101) and enters the exhaust tower (101). After entering the exhaust tower (101), the flue gas continues to flow forward until it hits the side wall of the expansion zone (102), and flows upward along the side wall. A small amount of flue gas is buffered at the bottom of the exhaust tower (101); the flue gas flowing upward forms a semi-annular flue gas flow in the expansion zone (102). At this time, the flow velocity of the flue gas is greatly reduced, and the flue gas inlet pressure becomes smaller in the expansion zone (102). When the flue gas enters the exhaust tower (101) upward, the flue gas flow velocity is stable and the flow field is uniform. It is not easy for the subsequent flue gas to push the previous flue gas to form turbulence, thereby achieving the purpose of reducing pressure and noise.

2. The exhaust system for a marine gas turbine test bench according to claim 1, characterized in that: The expansion area (102) is arranged to protrude outward from the side wall of the exhaust tower (101).

3. The exhaust system for a marine gas turbine test bench according to claim 2, characterized in that: The expansion area (102) and the smoke inlet straight pipe (5) are respectively located on both sides of the exhaust tower (101).

4. The exhaust system for a marine gas turbine test bench according to claim 1, characterized in that: A buffer distance is reserved between the communication position of the flue gas inflow straight pipe (5) and the exhaust tower (101) and the bottom of the exhaust tower (101).

5. The exhaust system for a marine gas turbine test bench according to claim 1, characterized in that: The expansion area (102) is configured in a cubic shape, and the dimensions of the expansion area (102) are: a length greater than or equal to 8 meters, a width greater than or equal to 5 meters, and a height greater than or equal to 7 meters.

6. The exhaust system for a marine gas turbine test bench according to claim 1, characterized in that: The vertically adjustable straight pipe section is used to adjust the installation requirements of the height between the exhaust end of the gas turbine and the inlet of the test bench exhaust tower (101); the horizontally adjustable straight pipe section (6) is used to adjust the installation requirements of the horizontal length between the exhaust end of the gas turbine and the inlet of the test bench exhaust tower (101).

7. The exhaust system for a marine gas turbine test bench according to claim 1, characterized in that: The first flue gas inlet pipe (2) adopts a round square pipe, the square pipe opening of the first flue gas inlet pipe (2) is connected to the gas turbine casing, and the round pipe opening of the first flue gas inlet pipe (2) is connected to the flue gas inlet elbow (4).

8. The exhaust system for a marine gas turbine test bench according to claim 7, characterized in that: The diameter of the gas outlet of the gas turbine casing is smaller than the diameter of the circular tube opening of the first flue gas inflow pipe (2).

9. The exhaust system for a marine gas turbine test bench according to claim 7, characterized in that: The flue gas inflow straight pipe (5) adopts a round tube with a square shape. The round tube mouth of the flue gas inflow straight pipe (5) is connected to the horizontal adjustment straight pipe section (6), and the square tube mouth of the flue gas inflow straight pipe (5) is connected to the exhaust tower (101).

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