An integrated air separation and power generation process produces an O2-enriched gas stream (28) and an N2-enriched gas stream (36) in an air separation unit (22). The O2-enriched gas stream (28) is introduced with fuel and steam to a combustor (12), producing flue gas. At least a portion of the flue gas and steam (18) exiting the combustor (2) is used to generate power (32). The N2-enriched gas steam (36) is heated and power (42) is generated from the heated N2-enriched gas steam.

Integrated air separation and power generation process

A combustor includes an end cap having upstream and downstream surfaces and a cap shield surrounding the upstream and downstream surfaces. First and second sets of premixer tubes extend from the upstream surface through the downstream surface. A first fuel conduit supplies fuel to the first set of premixer tubes. A casing circumferentially surrounds the cap shield to define an annular passage, and a second fuel conduit supplies fuel through the annular passage to the second set of premixer tubes. A method for supplying fuel to a combustor includes flowing a working fluid through first and second sets of premixer tubes, flowing a first fuel into the first set of premixer tubes, and flowing a second fuel through an annular passage surrounding the end cap and into the second set of premixer tubes.

Combustor and method for supplying fuel to a combustor

A combustion control system allows the dramatic reduction of NOx emission levels from industrial combustion processes without having recourse to expensive flue gas clean up methods. The system combines the technique of oscillating combustion with an adapted system for post combustion burn out of the excess of CO resulting from the low-NOx combustion zone. A process for fuel combustion includes generating an oscillating combustion zone by oscillating at least one of the fuel flow and the oxidant flow to achieve a reduced nitrogegn oxide emission, selecting oscillating parameters and furnace operating parameters to maximize nitrogen oxide reduction efficiency to the detriment of carbon monoxide production, and combusting carbon monixide downstream of the oscillating combustion zone by injecting a post combustion oxidant.

Process and apparatus of combustion for reduction of nitrogen oxide emissions

Landfill gas combustion and landfill leachate evaporation systems and the use of forest products or some such fuel to fire a gasifier that will eventually provide energy. Novel all-ceramic heat exchangers, systems in which they are used, and processes that can be handled by such systems.

All-ceramic heat exchangers, systems in which they are used and processes for the use of such systems

A glass-melting furnace (10) has an upstream end (6), a downstream end (8), and a roof (22). The upstream end is positioned upstream of the downstream end. A charger (32) is provided to supply glass-forming material (30) to the upstream end of the furnace. At least one burner (34) is provided to supply heat to the glass-forming material at the upstream end of the furnace. An exhaust (60) is in communication with the downstream end of the furnace, with the exhaust being positioned downstream of the at least one burner.

Exhaust positioned at the downstream end of a glass melting furnace

A self-cooled oxidant-fuel burner consisting novel fuel and oxidant nozzles and three compartment refractory burner block design is proposed. The new oxidant-fuel burner can fire in high-temperature (2200° F. to 3000° F.) and high-particulate (or high process volatiles/condensates) furnaces without over-heating or causing chemical corrosion damage to it's metallic burner nozzle and refractory burner block interior. Using various embodiments of nozzle and block shape, the burner can offer a traditional cylindrical flame or flat flame depending on the heating load requirements. The new features of this burner include unique fuel nozzle design for the streamline mixing of fuel and oxidant streams, a controlled swirl input to the oxidant flow for desired flame characteristics, a controlled expansion of flame envelope in the radial and axial dimensions, and efficient sweeping of burner block interior surface using oxidant to provide convective cooling and prevent any build up of process particulates. In addition, a relatively thick wall metallic nozzle construction with heat conduction fins enable efficient heat dissipation from the nozzle tip and providing a maintenance free burner operation.

Self-cooled oxygen-fuel burner for use in high-temperature and high-particulate furnaces

An oxygen enrichment system is provided which uses the existing air/fuel burners of a regenerative furnace to distribute additional oxygen to the burners for increased efficiency, and reduced nitrous oxide emissions. The centrally positioned cooling air lances in the burners of a regenerative furnace are modified to deliver oxygen when the burners are firing for oxygen enrichment. During the burner firing cycle, oxygen is delivered from an oxygen supply through the oxygen lance to provide a central oxygen jet. The fuel is delivered concentrically around the oxygen jet. During the non-firing cycle of the burner, cooling air or other cooling fluid is delivered from the cooling air supply through the oxygen jet for cooling the offside of the furnace.

Method and system for increasing the efficiency and productivity of a high temperature furnace

A heat exchanger useful for preheating oxidizing gases in a combustion process includes a shell having an inlet and an outlet for the ingress and egress of a first heat exchange fluid, such as a flue gas or preheated air A first tube manifold couples an inlet end-cap to the first end of the shell The inlet end-cap has an inlet for receiving a second heat exchange fluid, such as an oxidizing gas In one embodiment, a second manifold couples an outlet end-cap to the second end of the shell The second manifold includes an outlet tube therein extending from the second manifold through an outlet opening in the outlet end-cap A tube bundle is disposed within the shell for transporting the oxidizing gas through the heat exchanger and is coupled to the first and second tube manifolds The outlet tube collects oxidizing gas flowing through the tube bundle for discharge to a combustion system The outlet end-cap is pressurized with an inert atmosphere and houses a chemical detector to detect the presence of oxidizing gas within the outlet end-cap

Heat exchanger for preheating an oxidizing gas

Superior heat transfer in a kiln is achieved by the use of at least one injector which injects both an oxidant, preferably containing oxygen, and a secondary fuel into the kiln. The injectors are provided so that the energy resulting from the combustion of the different fuels in the kiln heats specified regions of the kiln, without causing hot spots on the refractory walls. A firing scheme is described for the oxygen and fuels which allows an increase in the amount of heat released toward the load, resulting in significant increases in kiln efficiency and production. Low quality fuels may be used, as well as using and/or recycling more insufflated dust, without an adverse effect on the main flame.

Prefferential oxygen firing system for counter-current mineral calcining

A process controls oxy-boost firing and air-fuel burner firing in furnaces, including large glass furnaces such as float furnaces. The large side-fired regenerative float furnaces use oxy-boost firing for a variety of reasons, including production increase, improved glass quality, lowering of superstructure temperatures, and reduction of emissions. An adaptive controller receives input data from process parameter sensors throughout the furnace, and adjusts its control logic for controlling both the oxy-boost burners and the air-fuel port burners.

Mahendra L. Joshi

Papers

Self-cooled oxygen-fuel burner for use in high-temperature and high-particulate furnaces

Method and system for increasing the efficiency and productivity of a high temperature furnace

Heat exchanger for preheating an oxidizing gas

Prefferential oxygen firing system for counter-current mineral calcining

Oxy-boost control in furnaces