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TURBINE CONDENSATE DRAIN SYSTEM

IP.com Disclosure Number: IPCOM000230797D
Publication Date: 2013-Sep-12
Document File: 5 page(s) / 195K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention discloses a condensate drain system. The condensate drain system collects water in one section of a steam turbine. The condensate drain system routes the water through a hood to drain into a condenser. In a low pressure barrel of the steam turbine, two standpipes at a bottom of the bowl collect condensate. Flanged pipe connections are provided on each standpipe. A pipe section is connected to each standpipe flange. The pipe section is removable which allows the steam turbine to assemble or disassemble. An orifice is located between one of a flange connection on each side of the steam turbine. The orifice is sized to regulate condensate flow.

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TURBINE CONDENSATE DRAIN SYSTEM

BACKGROUND

The present invention relates generally to a drain system, and more particularly to a steam turbine condensate drain system.

Generally, in a steam turbine, low pressure (LP) section includes wet steam. The wet stream results in condensate. The condensate collects at bottom of the steam turbine.

Conventional techniques are focused on collection of moisture. However, the conventional techniques do not remove condensate from turbine section.

Therefore, there is a need in the art for a technique of removal of condensate from turbine section.

BRIEF DESCRIPTION OF THE DRAWINGS

 

Figure 1 depicts the drain system including two standpipes beneath the bowl with two drain pipes.  

Figure 2 depicts drain pipe configured in the drain system.

Figure 3 depicts the fabricated box.

Figure 4 depicts a drain slot.

Figure 5 depicts a flow cover.

Figure 6 depicts flanged pipe connections provided on the standpipe.

Figure 7 depicts an orifice located between one of the flange connections on each side of a steam turbine.

DETAILED DESCRIPTION

The present invention proposes a condensate drain system. The condensate drain system collects water in one section of a steam turbine. The condensate drain system routes the water through a hood to drain into a condenser.

In a low pressure (LP) barrel of the steam turbine, two standpipes at a bottom of a bowl collect condensate. Figure 1 depicts the drain system including two standpipes beneath the bowl with two drain pipes.  

Figure 1- Drain system overview

The standpipe routes water from the drain pipes to a drain slot near the condenser flange in the hood. Figure 2 depicts drain pipe configured in the drain system.

Figure 2 – Drain Pipe

As depicted in the above figure, the drain pipe runs down each side of the hood. The drain pipe starts at the stand pipe and ends at a fabricated box near the condenser end of the hood. Figure 3 depicts the fabricated box.

Figure 3 – Fabricated box

The fabricated box is used to transition water flow from an end of each drain pipe to the drain slot in the hood wrapper. The fabricated box is welded in a place after machining the drain slot and installing the drain pipe through a rib. Figure 4 depicts a drain slot.

Figure 4 – Hood Slot.

Two drain slots, one for each pipe/fabricated box, are machined through a wrapper behind a LP head vertical pipe supports. Each drain slot has a fabricated insert seal welded on both sides of the slot where it passes through the wrapper. Such fabricated insert seal protects the drain slot from corrosion. A flow cover is provided over the hood opening. The flow cover provides steam flow over the opening. As a result, mixing of steam and water is minimized. Figure 5 depicts the flow cover.

Figure 5 – Flow Cover

The flow cover directs water flow towards the condenser. The flow cover minimizes steam flow disruptions caused by the drain slot. The cross section...