IMPROVED METHOD FOR INLET BLEED HEATING
Publication Date: 2014-Sep-03
The IP.com Prior Art Database
The invention proposes an inlet bleed heat (IBH) system design that reduces flow separation and turning losses in the elbow region and also reduces gas turbine inlet pressure drop at base load to improve gas turbine performance. The IBH system design includes several features, such as, a bleed heat system in form of turning vanes which is placed in an elbow region of an inlet duct. One other feature of the IBH system design includes pipes for providing internal support to vanes. Other features of the IBH system design include thermal sleeve, rotating feature, duct plate and support plate. Holes of variable diameter are welded between pipe and plate. Further, thermal sleeve and duct plate are also welded together.
The present invention relates generally to a gas turbine engine and more particularly to an inlet bleed heat system design for the gas turbine engine.
In general, inlet bleed heating (IBH) design includes either a two-pipe or multiple pipes. The pipes are placed after a silencer or in a filter house based on a frame. The inlet flow takes a 90 degree turn in an elbow region and enters into an air plenum and then to the compressor casing. During base load operation, the IBH is not operational and overall pressure drop depends on turning losses and separation losses in pipe and elbow region. However, such an IBH design does not utilize space in the elbow region for the IBH. Figure 1 depicts a conventional IBH system design.
Several conventional industrial practices are known in the art that utilizes, for example, piccolo pipe IBH, dual pipe and acoustical nozzles systems. However, these methods mainly concentrate on uniform mixing of compressor bleed air with main stream inlet flow.
A conventional technique includes inlet bleed heat (IBH) and steam injection system for gas turbine engine. The IBH and steam injection system includes inlet pipe coupled to a supply pipe while led with an inlet to the engine. Further, the system includes an inlet bleed heat isolation valve and an inlet bleed heat control valve.
Another conventional technique includes a method of controlling injection of liquid into an inflow duct of a prime mover or driven machine.
One other conventional technique includes a gas turbine arrangement having an integrated filter housing and compressor bleed duct combined into a single unit.
Another conventional technique includes an operating method for dry low nitrogen-oxide (DLN) reverse-flow combustor of gas turbine. The method includes bleeding compressor discharge air in excess of determined minimum amount from compressor via a control valve.
Yet another conventional technique includes a variable geometry ejector for a bleed air system using integral ejector exit pressure feedback.
One other conventional technique includes an inlet bleed heater for heating inlet air to a compressor and methods of fabricating and transporting the heater.
Another conventional technique includes an inlet bleed heat system for compressor of a turbine.
However, the above mentioned conventional techniques do not reduce flow separation and turning losses in the elbow region.
Therefore there is a need in the art to provide a technique that optimizes IBH system to reduce gas turbine inlet pressure drop at base load to improve gas turbine performance.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 depicts a conventional IBH system design.
Figure 2 depicts turning vanes configured in elbow region of the inlet duct.
Figure 3 depicts multiple holes on the surface of a vane.
Figure 4 depicts comparative study of conventional and proposed IBH design CFD model created for a frame of reference.
Figure 5 depic...