An exhaust cylinder for a high-speed ultra-high-pressure steam turbine

Abstract

An exhaust cylinder for a high-speed ultra-high-pressure steam turbine relates to an exhaust cylinder for a steam turbine. The present invention aims to solve the technical problems of the existing high-speed small steam turbine due to the short bearing span, the large number of stages, and the need to ensure the exhaust space. In the present invention, the lower part of the rear bearing box is a part of the exhaust cylinder, the lower lifting plate of the rear bearing box and the exhaust cylinder lifting plate are welded into an integrated structure, the upper cover of the rear bearing box and the lower part of the rear bearing box are tightened with bolts, and the exhaust cylinder and the rear bearing box are formed into one body, and the whole falls on the turbine base frame. The exhaust cylinder of the present invention is a single flow, and the steam flow flows into the exhaust cylinder through the exhaust outlet 1-1, flows along the exhaust guide, and finally flows into the condenser, and the bearing box and the exhaust cylinder are integrated; the exhaust cylinder of the present invention has a simple and compact structure, good rigidity, good aerodynamic performance, short bearing span, and good shaft system stability at high speed, which is beneficial to improve the thermal efficiency of the overall unit and ensure the safety of the unit.

Description

Technical Field

[0001] The invention relates to an exhaust cylinder for a steam turbine. Background Art

[0002] The existing small steam turbine units are generally subcritical parameters and normal speed. The exhaust cylinder is relatively simple to design separately. However, due to the short bearing span and many stages of high-temperature and high-speed small steam turbines, the exhaust space must be guaranteed. Therefore, the exhaust cylinder and the bearing box need to be designed as an integrated structure. Summary of the invention

[0003] The present invention aims to solve the technical problems of existing high-speed small steam turbines due to short bearing span, large number of stages and the need to ensure exhaust space, and to provide an exhaust cylinder for a high-speed ultra-high pressure steam turbine.

[0004] The exhaust cylinder for a high-speed ultra-high-pressure steam turbine of the present invention is composed of an exhaust cylinder body upper part 1, a blade top exhaust guide plate 1-2, a blade root exhaust guide plate 1-3, a lower half guide plate 1-4, a mist exhaust water spray head 1-6, a rear bearing box lower part 1-7, a rear bearing box lower part lifting plate 1-8, an exhaust cylinder lifting plate 1-9, an annular exhaust water spray pipe 1-10, a first rib plate 1-11, a second rib plate 1-12, a rear bearing box upper cover 2, a first bolt 3 and an exhaust cylinder body lower part 4;

[0005] The exhaust cylinder upper part 1 and the exhaust cylinder lower part 4 are fixed together by a plurality of second bolts; a through-flow exhaust outlet 1-1 is arranged on the side wall of the exhaust cylinder upper part 1 and the exhaust cylinder lower part 4 on the same side, a blade top exhaust guide plate 1-2 is fixed on the inner wall of the exhaust cylinder upper part 1 and the exhaust cylinder lower part 4 on the same side, the inlet of the blade top exhaust guide plate 1-2 is connected to the through-flow exhaust outlet 1-1, and a blade root is fixed on the inner wall opposite to the through-flow exhaust outlet 1-1. The exhaust steam guide plate 1-3 at the blade root and the exhaust steam guide plate 1-2 at the blade top are both trumpet-shaped structures, and the exhaust steam guide plate 1-3 at the blade root and the exhaust steam guide plate 1-2 at the blade top are coaxially arranged; an annular exhaust steam spray pipe 1-10 is arranged on the outer wall of the exhaust steam guide plate 1-2 at the blade top, and a plurality of mist exhaust steam spray heads 1-6 are evenly arranged on the annular exhaust steam spray pipe 1-10, and the annular exhaust steam spray pipe 1-10 is connected to the water inlet pipe 1-10-1;

[0006] The lower part 1-7 of the rear bearing box is embedded and fixed on the outer wall of the lower part 4 of the exhaust cylinder body opposite to the through-flow exhaust outlet 1-1, and the upper cover 2 of the rear bearing box is embedded and fixed on the outer wall of the upper part 1 of the exhaust cylinder body opposite to the through-flow exhaust outlet 1-1. The lower part 1-7 of the rear bearing box is directly below the upper cover 2 of the rear bearing box, and the lower part 1-7 of the rear bearing box is fixed to the upper cover 2 of the rear bearing box by a plurality of first bolts 3; the lower lifting plate 1-8 of the rear bearing box is fixed to the lifting plate 1-9 of the exhaust cylinder; a second rib 1-12 is arranged between the bottom of the lower part 1-7 of the rear bearing box and the exhaust guide plate 1-3 at the blade root;

[0007] A plurality of lower half guide plates 1-4 are symmetrically arranged on both sides of the lower middle part of the exhaust steam guide plate 1-3 at the blade root, the two lowest lower half guide plates 1-4 are respectively fixed to one end of the two first ribs 1-11, and the other ends of the two first ribs 1-11 are fixed to the inner wall of the lower middle part of the exhaust steam guide plate 1-3 at the blade root; an exhaust cylinder outlet 1-5 is arranged at the bottom of the lower part 4 of the exhaust cylinder body.

[0008] The working principle of the exhaust cylinder for a high-speed ultra-high-pressure steam turbine of the present invention is as follows: the exhaust steam after the steam of the turbine has done work through the blades in the through-flow enters the exhaust cylinder from the through-flow exhaust outlet 1-1, and the exhaust steam is evenly guided into the exhaust mixing space through the exhaust channel formed by the exhaust guide 1-2 at the top of the blade and the exhaust guide 1-3 at the root of the blade. The exhaust steam of the upper cylinder is converged with the lower exhaust steam through the middle dividing surface channel on the left and right sides through the lower half guide plate 1-4 and enters the condenser from the exhaust cylinder outlet 1-5.

[0009] The lower part 1-7 of the rear bearing box is a part of the exhaust cylinder. The lower lifting plate 1-8 of the rear bearing box and the exhaust cylinder lifting plate 1-9 are welded into an integrated structure. The upper cover 2 of the rear bearing box and the lower part 1-7 of the rear bearing box are fastened with bolts. The exhaust cylinder and the rear bearing box are integrated and fall on the turbine base frame as a whole.

[0010] Effects of the present invention:

[0011] The exhaust cylinder of the present invention is single-flow, and the steam flows into the exhaust cylinder through the exhaust outlet 1-1, flows along the exhaust guide, and finally flows into the condenser. The bearing box and the exhaust cylinder are integrated; the exhaust cylinder of the present invention has a simple and compact structure, good rigidity, good aerodynamic performance, short bearing span, and good shaft system stability at high speed, which is beneficial to improving the thermal efficiency of the overall unit and ensuring the safety of the unit.

[0012] The exhaust pressure loss of the exhaust cylinder of the present invention can be controlled below 3%, effectively improving the efficiency of the unit. The mist exhaust water spray heads 1-6 spray mist water to better ensure the temperature and pressure range of the exhaust steam, making the unit run more safely and reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1A schematic diagram of an exhaust cylinder for a high-speed ultra-high-pressure steam turbine according to a first specific embodiment;

[0014] Figure 2 for Figure 1 Bottom view of

[0015] Figure 3 for Figure 1 Right view of;

[0016] Figure 4 for Figure 1 CC profile of ;

[0017] Figure 5 for Figure 1 BB cross-section diagram. DETAILED DESCRIPTION

[0018] Specific implementation method 1: This implementation method is a high-speed ultra-high pressure steam turbine exhaust cylinder, such as Figure 1-Figure 5 As shown, it is specifically composed of an exhaust cylinder upper part 1, a blade top exhaust guide plate 1-2, a blade root exhaust guide plate 1-3, a lower half guide plate 1-4, a mist exhaust water spray head 1-6, a rear bearing box lower part 1-7, a rear bearing box lower lifting plate 1-8, an exhaust cylinder lifting plate 1-9, an annular exhaust water spray pipe 1-10, a first rib plate 1-11, a second rib plate 1-12, a rear bearing box upper cover 2, a first bolt 3 and an exhaust cylinder lower part 4;

[0019] The exhaust cylinder upper part 1 and the exhaust cylinder lower part 4 are fixed together by a plurality of second bolts; a through-flow exhaust outlet 1-1 is arranged on the side wall of the exhaust cylinder upper part 1 and the exhaust cylinder lower part 4 on the same side, a blade top exhaust guide plate 1-2 is fixed on the inner wall of the exhaust cylinder upper part 1 and the exhaust cylinder lower part 4 on the same side, the inlet of the blade top exhaust guide plate 1-2 is connected to the through-flow exhaust outlet 1-1, and a blade root is fixed on the inner wall opposite to the through-flow exhaust outlet 1-1. The exhaust steam guide plate 1-3 at the blade root and the exhaust steam guide plate 1-2 at the blade top are both trumpet-shaped structures, and the exhaust steam guide plate 1-3 at the blade root and the exhaust steam guide plate 1-2 at the blade top are coaxially arranged; an annular exhaust steam spray pipe 1-10 is arranged on the outer wall of the exhaust steam guide plate 1-2 at the blade top, and a plurality of mist exhaust steam spray heads 1-6 are evenly arranged on the annular exhaust steam spray pipe 1-10, and the annular exhaust steam spray pipe 1-10 is connected to the water inlet pipe 1-10-1;

[0020] The lower part 1-7 of the rear bearing box is embedded and fixed on the outer wall of the lower part 4 of the exhaust cylinder body opposite to the through-flow exhaust outlet 1-1, and the upper cover 2 of the rear bearing box is embedded and fixed on the outer wall of the upper part 1 of the exhaust cylinder body opposite to the through-flow exhaust outlet 1-1. The lower part 1-7 of the rear bearing box is directly below the upper cover 2 of the rear bearing box, and the lower part 1-7 of the rear bearing box is fixed to the upper cover 2 of the rear bearing box by a plurality of first bolts 3; the lower lifting plate 1-8 of the rear bearing box is fixed to the lifting plate 1-9 of the exhaust cylinder; a second rib 1-12 is arranged between the bottom of the lower part 1-7 of the rear bearing box and the exhaust guide plate 1-3 at the blade root;

[0021] A plurality of lower half guide plates 1-4 are symmetrically arranged on both sides of the lower middle part of the exhaust steam guide plate 1-3 at the blade root, the two lowest lower half guide plates 1-4 are respectively fixed to one end of the two first ribs 1-11, and the other ends of the two first ribs 1-11 are fixed to the inner wall of the lower middle part of the exhaust steam guide plate 1-3 at the blade root; an exhaust cylinder outlet 1-5 is arranged at the bottom of the lower part 4 of the exhaust cylinder body.

[0022] The working principle of the exhaust cylinder for the high-speed ultra-high-pressure steam turbine in this embodiment is as follows: the exhaust steam after the turbine steam has done work through the through-flow inner blades enters the exhaust cylinder from the through-flow exhaust outlet 1-1, and the exhaust steam is evenly guided into the exhaust mixing space through the exhaust channel formed by the exhaust guide 1-2 at the top of the blade and the exhaust guide 1-3 at the root of the blade. The exhaust steam from the upper cylinder is converged with the lower exhaust steam from the middle dividing surface channel on the left and right sides through the lower half guide plate 1-4 and enters the condenser from the exhaust cylinder outlet 1-5.

[0023] The lower part 1-7 of the rear bearing box is a part of the exhaust cylinder. The lower lifting plate 1-8 of the rear bearing box and the lifting plate 1-9 of the exhaust cylinder are welded into an integrated structure. The exhaust guide plate 1-2 at the top of the blade and the lower part 1-7 of the rear bearing box are fastened with bolts. The exhaust cylinder and the rear bearing box form a whole and fall on the turbine base frame as a whole.

[0024] Effects of this implementation method:

[0025] The exhaust cylinder of this embodiment is single-flow, and the steam flows into the exhaust cylinder through the exhaust outlet 1-1, flows along the exhaust guide, and finally flows into the condenser. The bearing box and the exhaust cylinder are integrated. The exhaust cylinder of this embodiment has a simple and compact structure, good rigidity, good aerodynamic performance, short bearing span, and good shaft system stability at high speed, which is beneficial to improving the thermal efficiency of the overall unit and ensuring the safety of the unit.

[0026] In this embodiment, the exhaust pressure loss of the exhaust cylinder can be controlled below 3%, effectively improving the efficiency of the unit.

[0027] Specific embodiment 2: This embodiment is different from the specific embodiment 1 in that the lower part 1-7 of the rear bearing box is embedded and welded to the outer wall of the lower part 4 of the exhaust cylinder body opposite to the exhaust outlet 1-1. The rest is the same as the specific embodiment 1.

[0028] Specific embodiment 3: This embodiment is different from specific embodiment 1 or 2 in that: the rear bearing box upper cover 2 is embedded and welded to the inner wall of the exhaust cylinder upper part 1 opposite to the exhaust outlet 1-1. The rest is the same as specific embodiment 1 or 2.

[0029] Specific embodiment 4: This embodiment is different from specific embodiments 1 to 3 in that the second ribs 1-12 are semicircular plates. Other aspects are the same as those of specific embodiments 1 to 3.

[0030] Specific embodiment 5: This embodiment is different from specific embodiment 4 in that eight mist exhaust water spray heads 1-6 are evenly arranged on the annular exhaust water spray pipe 1-10. The rest is the same as specific embodiment 4.

[0031] The present invention is verified by the following tests:

[0032] Test 1: This test is for a high-speed ultra-high-pressure steam turbine exhaust cylinder, such as Figure 1-Figure 5 As shown, it is specifically composed of an exhaust cylinder upper part 1, a blade top exhaust guide plate 1-2, a blade root exhaust guide plate 1-3, a lower half guide plate 1-4, a mist exhaust water spray head 1-6, a rear bearing box lower part 1-7, a rear bearing box lower lifting plate 1-8, an exhaust cylinder lifting plate 1-9, an annular exhaust water spray pipe 1-10, a first rib plate 1-11, a second rib plate 1-12, a rear bearing box upper cover 2, a first bolt 3 and an exhaust cylinder lower part 4;

[0033] The exhaust cylinder upper part 1 and the exhaust cylinder lower part 4 are fixed together by a plurality of second bolts; a through-flow exhaust outlet 1-1 is arranged on the side wall of the exhaust cylinder upper part 1 and the exhaust cylinder lower part 4 on the same side, a blade top exhaust guide plate 1-2 is fixed on the inner wall of the exhaust cylinder upper part 1 and the exhaust cylinder lower part 4 on the same side, the inlet of the blade top exhaust guide plate 1-2 is connected to the through-flow exhaust outlet 1-1, and a blade root is fixed on the inner wall opposite to the through-flow exhaust outlet 1-1. The exhaust steam guide plate 1-3 at the blade root and the exhaust steam guide plate 1-2 at the blade top are both trumpet-shaped structures, and the exhaust steam guide plate 1-3 at the blade root and the exhaust steam guide plate 1-2 at the blade top are coaxially arranged; an annular exhaust steam spray pipe 1-10 is arranged on the outer wall of the exhaust steam guide plate 1-2 at the blade top, and a plurality of mist exhaust steam spray heads 1-6 are evenly arranged on the annular exhaust steam spray pipe 1-10, and the annular exhaust steam spray pipe 1-10 is connected to the water inlet pipe 1-10-1;

[0034] The lower part 1-7 of the rear bearing box is embedded and fixed on the inner wall of the lower part 4 of the exhaust cylinder body opposite to the through-flow exhaust outlet 1-1, and the upper cover 2 of the rear bearing box is embedded and fixed on the inner wall of the upper part 1 of the exhaust cylinder body opposite to the through-flow exhaust outlet 1-1. The lower part 1-7 of the rear bearing box is directly below the upper cover 2 of the rear bearing box, and the lower part 1-7 of the rear bearing box is fixed to the upper cover 2 of the rear bearing box by a plurality of first bolts 3; the lower lifting plate 1-8 of the rear bearing box is welded to the lifting plate 1-9 of the exhaust part as a whole; a second rib plate 1-12 is arranged between the bottom of the lower part 1-7 of the rear bearing box and the exhaust guide plate 1-3 at the blade root;

[0035] A plurality of lower half guide plates 1-4 are symmetrically arranged on both sides of the lower middle part of the exhaust steam guide plate 1-3 at the blade root, the two lowest lower half guide plates 1-4 are respectively fixed to one end of the two first ribs 1-11, and the other ends of the two first ribs 1-11 are fixed to the inner wall of the lower middle part of the exhaust steam guide plate 1-3 at the blade root; an exhaust cylinder outlet 1-5 is arranged at the bottom of the lower part 4 of the exhaust cylinder body.

[0036] The working principle of the exhaust cylinder for the high-speed ultra-high-pressure steam turbine in this test is as follows: the exhaust steam after the turbine steam has done work through the through-flow inner blades enters the exhaust cylinder from the through-flow exhaust outlet 1-1, and the exhaust steam is evenly guided into the exhaust mixing space through the exhaust channel formed by the exhaust guide 1-2 at the top of the blade and the exhaust guide 1-3 at the root of the blade. The exhaust steam from the upper cylinder is converged with the lower exhaust steam from the left and right center dividing surface channels through the lower half guide plate 1-4 and enters the condenser from the exhaust cylinder outlet 1-5.

[0037] The lower part 1-7 of the rear bearing box is a part of the exhaust cylinder. The lower lifting plate 1-8 of the rear bearing box is fixed with the exhaust part lifting plate 1-9 as an integrated structure. The exhaust guide plate 1-2 at the top of the blade is fastened to the lower part 1-7 of the rear bearing box with bolts. The exhaust cylinder and the rear bearing box are formed into one body and fall on the turbine base frame as a whole.

[0038] The results of this test:

[0039] The exhaust cylinder of this test is single-flow, and the steam flows into the exhaust cylinder through the exhaust outlet 1-1, flows along the exhaust guide, and finally flows into the condenser. The bearing box and the exhaust cylinder are integrated; the exhaust cylinder of this test has a simple and compact structure, good rigidity, good aerodynamic performance, short bearing span, and good shaft stability at high speed, which is beneficial to improving the thermal efficiency of the overall unit and ensuring the safety of the unit.

[0040] In this test, the exhaust pressure loss of the exhaust cylinder can be controlled below 3%, effectively improving the efficiency of the unit.

Claims

1. An exhaust cylinder for a high-speed ultra-high-pressure steam turbine, characterized in that The exhaust cylinder for a high-speed ultra-high-pressure steam turbine is composed of an exhaust cylinder upper part (1), a blade top exhaust guide plate (1-2), a blade root exhaust guide plate (1-3), a lower half guide plate (1-4), a mist exhaust water spray head (1-6), a rear bearing box lower part (1-7), a rear bearing box lower part lifting plate (1-8), an exhaust cylinder lifting plate (1-9), an annular exhaust water spray pipe (1-10), a first rib plate (1-11), a second rib plate (1-12), a rear bearing box upper cover (2), a first bolt (3) and an exhaust cylinder lower part (4); The upper part (1) of the exhaust cylinder body and the lower part (4) of the exhaust cylinder body are fixed together by a plurality of second bolts; a through-flow exhaust outlet (1-1) is arranged on the side wall of the upper part (1) of the exhaust cylinder body and the lower part (4) of the exhaust cylinder body; a blade top exhaust guide plate (1-2) is fixed on the inner wall of the upper part (1) of the exhaust cylinder body and the lower part (4) of the exhaust cylinder body; an inlet of the blade top exhaust guide plate (1-2) is connected to the through-flow exhaust outlet (1-1); a blade root is fixed on the inner wall opposite to the through-flow exhaust outlet (1-1); The exhaust steam guide plate (1-3) at the blade root and the exhaust steam guide plate (1-2) at the blade top are both trumpet-shaped structures, and the exhaust steam guide plate (1-3) at the blade root and the exhaust steam guide plate (1-2) at the blade top are coaxially arranged; an annular exhaust steam spray pipe (1-10) is arranged on the outer wall of the exhaust steam guide plate (1-2) at the blade top, and 8 mist exhaust water spray heads (1-6) are evenly arranged on the annular exhaust steam spray pipe (1-10), and the annular exhaust steam spray pipe (1-10) is connected to the water inlet pipe (1-10-1); The lower part (1-7) of the rear bearing box is embedded and fixed on the outer wall of the lower part (4) of the exhaust cylinder body opposite to the through-flow exhaust steam outlet (1-1), and the upper cover (2) of the rear bearing box is embedded and fixed on the outer wall of the upper part (1) of the exhaust cylinder body opposite to the through-flow exhaust steam outlet (1-1), the lower part (1-7) of the rear bearing box is directly below the upper cover (2) of the rear bearing box, and the lower part (1-7) of the rear bearing box is fixed to the upper cover (2) of the rear bearing box by a plurality of first bolts (3); the lower lifting plate (1-8) of the rear bearing box is fixed to the lifting plate (1-9) of the exhaust cylinder; a second rib plate (1-12) is arranged between the bottom of the lower part (1-7) of the rear bearing box and the exhaust steam guide plate (1-3) at the blade root, and the second rib plate (1-12) is a semicircular plate; A plurality of lower half guide plates (1-4) are symmetrically arranged on both sides of the lower middle portion of the exhaust steam guide plate (1-3) at the blade root, the two lower half guide plates (1-4) being respectively fixed to one end of two first ribs (1-11), and the other ends of the two first ribs (1-11) being fixed to the inner wall of the lower middle portion of the exhaust steam guide plate (1-3) at the blade root; and an exhaust cylinder outlet (1-5) is arranged at the bottom of the lower portion (4) of the exhaust cylinder body.

2. The high speed ultra-high pressure steam turbine exhaust cylinder according to claim 1, characterized in that The lower part (1-7) of the rear bearing box is embedded and fixed by welding on the outer wall of the lower part (4) of the exhaust cylinder body opposite to the through-flow exhaust outlet (1-1).

3. The high-speed ultra-high-pressure steam turbine exhaust cylinder according to claim 1, characterized in that A rear bearing box upper cover (2) is embedded and welded and fixed on the outer wall of the upper part (1) of the exhaust cylinder body opposite to the through-flow exhaust outlet (1-1).

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