Multistage pressure condenser and steam turbine plant having the same

• US 9,488,416 B2
• Filed: 11/26/2012
• Issued: 11/08/2016
• Est. Priority Date: 11/28/2011
• Status: Active Grant

• Current Assignee: mitsubishi hitachi power systems, ltd. (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: mitsubishi hitachi power systems, ltd. (Mitsubishi Heavy Industries, Ltd.)
• Inventors: Fujita, Issaku, Kasahara, Jiro, Utsumi, Seiho
• Primary Examiner(s): McKenzie, Thomas Bennett
• Application Number:
  US13/684,916
• Publication Number:
  US 20130167536A1
• Time in Patent Office: 1,443 Days
• Field of Search: 60685-697, 261146-149, 96155-220
• US Class Current: 1/1
• CPC Class Codes: F01K 9/003 condenser cooling circuits
• CPC Class Codes: F28B 1/00 Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
• CPC Class Codes: F28B 1/02 using water or other liquid as the cooling medium
• CPC Class Codes: F28B 7/00 Combinations of two or more condensers, e.g. provision of reserve condenser
• CPC Class Codes: F28B 9/08 for collecting and removing condensate

Abstract

A multistage pressure condenser includes, a high pressure chamber and a low pressure chamber, a pressure partition wall which partitions an inner portion of the low pressure chamber to an upper portion and a lower portion, a cooling pipe group which condenses low pressure side steam to low pressure side condensate, a reheat chamber positioned in the lower portion of the low pressure chamber and in which the low pressure side condensate which flows down through the porous plate is stored, high pressure side steam introduction portion for introducing high pressure side steam in the high pressure chamber to the reheat chamber, liquid-film forming portion which guides the low pressure side condensate which flows down through the porous plate to the reheat chamber while dispersing the low pressure side condensate on a surface, and air feeder for promoting the flow of the high pressure side steam.

Claims

1. multistage pressure condenser comprising:

a plurality of pressure chambers in which pressures are different from one another, the plurality of pressure chambers including;

a high pressure chamber, into which high pressure side steam is introduced and which maintains the high pressure side steam at a first steam pressure; and

a low pressure chamber, into which low pressure side steam is introduced and which maintains the low pressure side steam at a second steam pressure which is lower than the first steam pressure;

a pressure partition wall configured to partition an inner portion of the low pressure chamber into an upper portion and a lower portion and which includes a porous plate in which a plurality of holes are formed;

a cooling pipe group provided at the upper portion of the low pressure chamber partitioned by the pressure partition wall, the cooling pipe group exchanging heat with the low pressure side steam through cooling water introduced to the cooling pipe group, thereby condensing the low pressure side steam to low pressure side condensate;

a reheat chamber positioned in the lower portion of the low pressure chamber partitioned by the pressure partition wall, the reheat chamber storing the low pressure side condensate which flows down through the porous plate;

a steam duct configured to connect the high pressure chamber and the reheat chamber and introduce the high pressure side steam to the reheat chamber;

a corrugated plate unit positioned under the porous plate, the corrugated plate unit configured to guide the low pressure side condensate which flows down through the porous plate to the reheat chamber while dispersing the low pressure side condensate on a surface of the corrugated plate unit;

a vent pipe configured to introduce the high pressure side steam into the corrugated plate unit while promoting the flow of the high pressure side steam which is introduced through the steam duct; and

a current plate provided to the corrugated plate unit,

wherein the vent pipe penetrates the pressure partition wall, is located further downstream than the corrugated plate unit in a flow channel direction of the high pressure side steam, and circulates the high pressure side steam to the upper portion of the low pressure chamber from the reheat chamber, and

wherein the current plate is located further upstream than the corrugated plate unit in the flow channel direction of the high pressure side steam, straightens the high pressure side steam, and introduces the high pressure side steam into the corrugated plate unit.

2. The multistage pressure condenser according to claim 1, further comprising a valve located in the vent pipe, the valve being configured to adjust a flow rate of the high pressure side steam which flows in the vent pipe.

4. The multistage pressure condenser according to claim 1, wherein the corrugated plate unit includes a plurality of plate-shaped members which are disposed along a flow-down direction of the low pressure side condensate and the flow channel direction of the high pressure side steam, and are disposed to be parallel to each other with intervals in an orthogonal direction perpendicular to the flow-down direction and the flow channel direction, and

each of the plate-shaped members has a shape in which a cross-sectional shape is uneven in the orthogonal direction when viewed from the flow channel direction, and is configured such that the low pressure side condensate flows down its surface.

5. The multistage pressure condenser according to claim 2, wherein the corrugated plate unit includes a plurality of plate-shaped members which are disposed along a flow-down direction of the low pressure side condensate and the flow channel direction of the high pressure side steam, and are disposed to be parallel to each other with intervals in an orthogonal direction perpendicular to the flow-down direction and the flow channel direction, and

each of the plate-shaped members has a shape in which a cross-sectional shape is uneven in the orthogonal direction when viewed from the flow channel direction, and is configured such that the low pressure side condensate flows down its surface.

7. steam turbine plant comprising:

the multistage pressure condenser according to claim 1.

8. The steam turbine plant according to claim 7, further comprising a valve located in the vent pipe, the valve being configured to adjust a flow rate of the high pressure side steam which flows in the vent pipe.

10. The steam turbine plant according to claim 7, wherein

the corrugated plate unit includes a plurality of plate-shaped members which are disposed along a flow-down direction of the low pressure side condensate and the flow channel direction of the high pressure side steam, and are disposed to be parallel to each other with intervals in an orthogonal direction perpendicular to the flow-down direction and the flow channel direction, and

each of the plate-shaped members has a shape in which a cross-sectional shape is uneven in the orthogonal direction when viewed from the flow channel direction, and is configured such that the low pressure side condensate flows down its surface.

3. multistage pressure condenser comprising:

a plurality of pressure chambers in which pressures are different from one another, the plurality of pressure chambers including;

a high pressure chamber, into which high pressure side steam is introduced and which maintains the high pressure side steam at a first steam pressure; and

a low pressure chamber, into which low pressure side steam is introduced and which maintains the low pressure side steam at a second steam pressure which is lower than the first steam pressure;

a pressure partition wall configured to partition an inner portion of the low pressure chamber into an upper portion and a lower portion and which includes a porous plate in which a plurality of holes are formed;

a cooling pipe group provided at the upper portion of the low pressure chamber partitioned by the pressure partition wall, the cooling pipe group exchanging heat with the low pressure side steam through cooling water introduced to the cooling pipe group, thereby condensing the low pressure side steam to low pressure side condensate;

a reheat chamber positioned in the lower portion of the low pressure chamber partitioned by the pressure partition wall, the reheat chamber storing the low pressure side condensate which flows down through the porous plate;

a steam duct configured to connect the high pressure chamber and the reheat chamber and introduce the high pressure side steam to the reheat chamber;

a corrugated plate unit positioned under the porous plate, the corrugated plate unit configured to guide the low pressure side condensate which flows down through the porous plate to the reheat chamber while dispersing the low pressure side condensate on a surface of the corrugated plate unit;

a blower disposed in the steam duct and configured to introduce the high pressure side steam into the corrugated plate unit while promoting the flow of the high pressure side steam which is introduced through the steam duct; and

a current plate provided to the corrugated plate unit,

wherein the current plate is located further upstream than the corrugated plate unit in a flow channel direction of the high pressure side steam, straightens the high pressure side steam, and introduces the high pressure side steam into the corrugated plate unit, and

wherein the blower introduces the high pressure side steam into the corrugated plate unit through the current plate.

6. The multistage pressure condenser according to claim 3, wherein the corrugated plate unit includes a plurality of plate-shaped members which are disposed along a flow-down direction of the low pressure side condensate and the flow channel direction of the high pressure side steam, and are disposed to be parallel to each other with intervals in an orthogonal direction perpendicular to the flow-down direction and the flow channel direction, and

each of the plate-shaped members has a shape in which a cross-sectional shape is uneven in the orthogonal direction when viewed from the flow channel direction, and is configured such that the low pressure side condensate flows down its surface.

9. steam turbine plant comprising:

the multistage pressure condenser according to claim 3.

11. The steam turbine plant according to claim 9, wherein

the corrugated plate unit includes a plurality of plate-shaped members which are disposed along a flow-down direction of the low pressure side condensate and the flow channel direction of the high pressure side steam, and are disposed to be parallel to each other with intervals in an orthogonal direction perpendicular to the flow-down direction and the flow channel direction, and

each of the plate-shaped members has a shape in which a cross-sectional shape is uneven in the orthogonal direction when viewed from the flow channel direction, and is configured such that the low pressure side condensate flows down its surface.