International Power Technology

Other

Cheng Power Systems, Inc.

International Microporous Technology, Inc.

Cheng Technology & Services, Inc.

Dah Y Cheng

James C Fletcher

James J Hamill

Steve J Wiersma

William Conlon

Ramarao Digumarthi

Chun-Nan Chang

Alan L Helgesson

Chung-Nan Chang

A fuel nozzle having a flow pathway including a smooth, sharp, or mitered bend prior to a nozzle tip is provided. The fuel nozzle injects fuel into a combustion chamber with an even flow distribution of the fuel and substantially reduces undesirable acoustic resonance encountered in a fuel nozzle body in a combustion system.

Method and apparatus for balancing flow through fuel nozzles

System, methods and apparatus for dynamic control of mixing of diluent and fuel at desired diluent-to-fuel ratios to obtain low level of undesirable emissions in a combustion system are described.

Dynamic control system to implement homogenous mixing of diluent and fuel to enable gas turbine combustion systems to reach and maintain low emission levels

An Advanced Cheng Combined Cycle engine is a combination of the Cheng Cycle or the Advanced Cheng Cycle and a combined cycle, and serves to further enhance the power generation capability of either the Cheng Cycle, the Advanced Cheng Cycle, or the combined cycle alone. A gas turbine is provided, having a turbine generating power, a compressor receiving power from the turbine, and a combustion chamber to which is input compressed air from the compressor along with fuel and combustion products for producing energy to drive the turbine, the gas turbine producing a hot stream gas. A heat recovery steam generator receives hot stream gas produced by the gas turbine and generates high-pressure steam therefrom. A steam turbine receives and is driven by high-pressure steam generated by the heat recovery steam generator. The steam turbine bleeds intermediate-pressure steam for cooling the turbine and for injection back into the combustion chamber of the gas turbine. A control valve throttles down high-pressure steam generated by the heat recovery steam generator to a low-pressure steam for injection back into the combustion chamber of the gas turbine.

Advanced Cheng Combined Cycle

A method and apparatus for reducing emissions in combustion systems, particularly gas turbines. A mixture of diluent and fuel is created, wherein the diluent and the fuel are at a predetermined diluent-to-fuel ratio. The mixture is homogenized to create a homogenized mixture having a uniform concentration distribution of the diluent and the fuel at the predetermined diluent-fuel ratio. Thereafter, the homogenized mixture is introduced into a flame zone and the homogenized mixture is combusted.

Method and apparatus to homogenize fuel and diluent for reducing emissions in combustion systems

A power generator in which the rotor's mechanical rotation speed and the output frequency can be varied substantially independently of each other through electronic controls, to achieve results such as better match between speed and load regime of the primary mover and the generator's output.

Universal frequency electrical generator

A steam injection nozzle system for injecting steam into a combustion liner of a gas turbine for enhancing power output and efficiency of the gas turbine. The combustion liner has a plurality of dilution holes for supplying air to a combustion chamber to create turbulence. A steam manifold surrounds the combustion liner and has a plurality of steam injection nozzles, each steam injection nozzle being disposed opposite a corresponding dilution hole, without touching the combustion liner, for injecting the steam directly into the combustion liner through the dilution holes. The steam is injected without altering an existing amount of air through the plurality of dilution holes, resulting in a constant amount of air through the plurality of dilution holes independent of the amount of steam injected therein within a predetermined range of steam. The predetermined range of steam injected may be between approximately 9% and approximately 35%, inclusive, of the air flowing through the combustion liner. Alternatively, the predetermined range of steam injected may be less than or equal to approximately 35% of the air flowing through the combustion liner.

Steam injection nozzle design of gas turbine combustion liners for enhancing power output and efficiency

A concept of pulse input thermal energy to induce a rapid volume change in a vessel is introduced to provide rapid pressure raise as a means to inject fuel into internal combustion engines. A computer and sensors are incorporated to provide pulse width, height and multiple pulse using engine conditions such as RPM, exhaust pollution and efficiency, etc. as control parameters.

Electro-thermal pulsed fuel injector and system

A rotating field, synchronized electric generator or motor in which the magnetic field that the armature produces can rotate relative to the stator at a speed significantly different from that of the armature, under electronic or other control that obviates the need for a mechanical torque-carrying gearbox that can be used for a similar purpose in a synchronized generator or motor.

Electrical generators and motors in which at steady-state the rotor and

A means and method of design and installation of a pre-rotator ahead of an elbow are disclosed in order to eliminate or reduce elbow-induced turbulence in pipe flows. Experimental verification was conducted, and noise and pressure loss for flow around the elbow can be substantially reduced.

Laminar flow elbow system and method

A method of operation of an Advanced Cheng Cycle heat engine comprising: (a) initializing start conditions in the gas turbine engine and the heat recovery steam generator with the control system; (b) setting the control valve means for idle flow condition of the heat engine; (c) pressurizing the drum with the compressed gas source to approximately the desired operating pressure of the heat recovery steam generator; (d) starting the gas turbine engine from idle to full load as limited by maximum allowed turbine inlet temperature; and (e) throttling second working fluid flow rate with the control valve means and shutting off the compressed gas source, after the sensor system indicates that heat recovery steam generator pressure is higher than compressor discharge pressure. Throttling is performed in accordance with the following operating parameters: (i) second working fluid temperature as injected into the turbine less than or substantially equal to first working fluid temperature at the compressor outlet, and (ii) maximization of heat recovery from the turbine exhaust for a given peak efficiency mixture ratio of second working fluid to first working fluid in the turbine, so that heat recovery exchanger pinch temperature is minimized.

Method for starting and operating an advanced regenerative parallel

A reflecting surface which is open at least at one axial end and in an axial section conforms to an axial section through a geometric surface generated by rotating a parabolic curve about an axis normal to the parabola axes. An elongated source/sink extends along the axis of the reflecting surface and is at least partly enveloped by that surface.

Orthogonal parabolic reflector systems

A Cheng cycle, dual-fluid heat engine comprising a compressor for compressing a first working fluid, having a compressor outlet; a combustion chamber in fluid communication with the compressor outlet; a turbine having an inlet in fluid communication with the combustion chamber for performing work by expansion of working fluid, and a turbine exhaust. The engine also has a heat recovery exchanger coupled to the turbine exhaust for heating thereby, having a heat recovery exchanger inlet and an outlet for heating a second working fluid; and an injector for introducing heated second working fluid from the heat recovery exchanger into the turbine. The engine has a coolant inlet port for introducing coolant having a temperature less than the first working fluid temperature at the compressor outlet, to at least one of turbine nozzles and blades in the turbine. The engine has control valve means for selectively throttling flow rate of second working fluid into the turbine in accordance with the following operating parameters: (i) second working fluid temperature as injected into the turbine less than or substantially equal to first working fluid temperature at the compressor outlet, and (ii) maximization of heat recovery from the turbine exhaust for a given peak efficiency mixture ratio of second working fluid to first working fluid in the turbine, so that heat recovery exchanger pinch temperature is minimized. The control valve means is connected upstream of the injector.

Advanced regenerative parallel compound dual fluid heat engine Advanced

A concept of pulse input thermal energy to induce a rapid volume change in a vessel is introduced to provide rapid pressure raise as a means to inject fuel into internal combustion engines. A computer and sensor means are incorporated to provide pulse width, height and multiple pulse using engine conditions such as RPM, exhaust pollution and efficiency, etc. as control parameters.

A design concept and method for a diverter which enables a diffuser to obtain pressure recovery at a very large expansion angle to be comparable to those with less than 15.degree. expansion angle diffusers.

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Los Altos Hills, CA, United States of America

Dah Y Cheng