The present invention provides methods and system for power generation using a high efficiency combustor in combination with a CO.sub.2 circulating fluid. The methods and systems advantageously can make use of a low pressure ratio power turbine and an economizer heat exchanger in specific embodiments. Additional low grade heat from an external source can be used to provide part of an amount of heat needed for heating the recycle CO.sub.2 circulating fluid. Fuel derived CO.sub.2 can be captured and delivered at pipeline pressure. Other impurities can be captured.

Techniques regarding the composition and/or structure of oven walls are provided. For example, one or more embodiments described herein can comprise an oven with a heat source configured to heat a hollow space within the oven. The oven further can comprise an oven body that can define the hollow space. Also, the oven body can comprise a plurality of connected sides, wherein one or more of the connected sides comprise a plurality of carbon nanotubes.

Techniques regarding the composition and/or structure of oven walls are provided. For example, one or more embodiments described herein can comprise an oven with a heat source configured to heat a hollow space within the oven. The oven further can comprise an oven body that can define the hollow space. Also, the oven body can comprise a plurality of connected sides, wherein one or more of the connected sides comprise a plurality of carbon nanotubes.

A ceramic matrix composite includes continuous silicon carbide fibers in a ceramic matrix comprising silicon carbide and a MAX phase compound having a chemical composition M.sub.n+1AX.sub.n, where M is a transition metal selected from the group consisting of: Ti, V, Cr, Sc, Zr, Nb, Mo, Hf, and Ta; A is a group-A element selected from the group consisting of: Al, Si, P, S, Ga, Ge, As, Cd, In, Sn, Tl and Pb; and X is carbon or nitrogen, with n being an integer from 1 to 3.

A combustor of a gas turbine engine including a combustor shell having an interior surface, a first panel mounted to the interior surface at a first position and a second panel mounted to the interior surface at a second position. The first panel has a first end, a first combustion chamber surface parallel with the interior surface, a first rail extending from the first combustion chamber surface toward the interior surface of the combustor shell, and a first extension extending axially from the first rail to the end of the first panel. The second panel has a second end, a second combustion chamber surface, and a second rail extending from the second combustion chamber surface toward the interior surface of the combustor shell. The first end and the second end are proximal to each other and define a circumferentially extending gap there between.

A wood pellet stove operable to mount to a wall includes a combustion chamber, a combustion chamber door, and a hopper. The combustion chamber has a front, back, and side. The combustion chamber door is in the front of the combustion chamber. The hopper is mounted at the side of the combustion chamber. The bottom of the hopper is below a top of the combustion chamber, and a top of the hopper is substantially coplanar with the top of the combustion chamber. The stove may also include a sight glass or fuel level monitoring system for determining a fuel level of the hopper without opening the hopper.

A wood pellet stove operable to mount to a wall includes a combustion chamber, a combustion chamber door, and a hopper. The combustion chamber has a front, back, and side. The combustion chamber door is in the front of the combustion chamber. The hopper is mounted at the side of the combustion chamber. The bottom of the hopper is below a top of the combustion chamber, and a top of the hopper is substantially coplanar with the top of the combustion chamber. The stove may also include a sight glass or fuel level monitoring system for determining a fuel level of the hopper without opening the hopper.

A system includes a layered structure. The layered structure includes first and second coalesced layers and an intermediate layer disposed between the first and second coalesced layers. The first and second coalesced layers have a higher degree of coalescence than the intermediate layer.

A gasifier for disposing of biomass and other waste materials through a gasification and combustion process. The gasifier includes a primary chamber for receiving and holding biomass or a selected waste product. A heat transfer chamber is disposed adjacent the primary chamber. A burner is associated with the gasifier for generating heat and heating the gasifier during various phases or portions of the gasification and combustion process. In the gasification process, the heat transfer chamber is heated and the heat is transferred to the primary chamber where the biomass is heated. During the gasification process, biomass material is volatized generating fumes and gases that later react and release heat through exothermic reactions. Once the gasification process has been concluded, the process enters a combustion phase where the biomass is actually burned. During the gasification-combustion phases, the amount of heat supplied by the burner will vary. Generally the amount of energy or heat supplied by the burner will decrease throughout the process because the biomass itself will supply substantial amounts of heat through exothermic reactions.

A gasifier for disposing of biomass and other waste materials through a gasification and combustion process. The gasifier includes a primary chamber for receiving and holding biomass or a selected waste product. A heat transfer chamber is disposed adjacent the primary chamber. A burner is associated with the gasifier for generating heat and heating the gasifier during various phases or portions of the gasification and combustion process. In the gasification process, the heat transfer chamber is heated and the heat is transferred to the primary chamber where the biomass is heated. During the gasification process, biomass material is volatized generating fumes and gases that later react and release heat through exothermic reactions. Once the gasification process has been concluded, the process enters a combustion phase where the biomass is actually burned. During the gasification-combustion phases, the amount of heat supplied by the burner will vary. Generally the amount of energy or heat supplied by the burner will decrease throughout the process because the biomass itself will supply substantial amounts of heat through exothermic reactions.