Abstract:
A combustion control device for an engine capable of operation over a wide range and in which the NOx discharged amount is small is provided, as well as a combustion method for a homogeneous lean air/fuel mixture. The combustion method for a homogeneous lean air/fuel mixture of the present invention forms a homogeneous lean air/fuel mixture inside of the cylinder of the engine, and then causes this homogeneous lean air/fuel mixture to combust by way of spark ignition. A temperature at which a steep rise in a laminar burning velocity occurs when changing a cylinder temperature under a pressure condition corresponding to compression top dead center is defined as an inflection-point temperature. With the combustion method of the present invention, the cylinder temperature at compression top dead center inside of the cylinder is raised to higher than the inflection-point temperature upon combusting the homogeneous lean air/fuel mixture.
Abstract:
A fuel production system and a fuel production method are provided which can efficiently perform adjusting of a synthesis gas composition by hydrogen supply, while suppressing the generated amount of carbon dioxide by a system overall. A fuel production system includes: a gasification furnace which gasifies a biomass raw material to generate a synthesis gas containing hydrogen and carbon monoxide; a liquid fuel production device which produces a liquid fuel from the synthesis gas generated by the gasification furnace; a hydrogen supply pump which supplies hydrogen to a raw material supply area or a synthesis gas discharge area; a byproduct sensor which detects a byproduct amount generated inside the gasification furnace; and a controller which switches a hydrogen supply location by the hydrogen supply pump between the raw material supply area and synthesis gas discharge area, based on the byproduct amount detected by the byproduct sensor.
Abstract:
A mixer to mix a fuel with air includes plural fluid inlets, at least one fluid outlet, a casing, a plurality of stirring blades, and a particle material or a porous material. The casing has a substantially tubular shape extending in an axial direction of the casing between the plural fluid inlets and the at least one fluid outlet. The plurality of stirring blades are provided in the casing to align in the axial direction so that a torsional turning direction of the plurality of stirring blades is sequentially reversed in an order of alignment. The particle material or a porous material is disposed in the casing to fill an entire space containing the plurality of stirring blades from the plural fluid inlets to the at least one fluid outlet. Sizes of gaps existing in the entire space are less than a quenching distance of the fuel.
Abstract:
A fuel production system and a fuel production method are provided which can efficiently perform adjusting of a synthesis gas composition by hydrogen supply, while suppressing the generated amount of carbon dioxide by a system overall. A fuel production system includes: a gasification furnace which gasifies a biomass raw material to generate a synthesis gas containing hydrogen and carbon monoxide; a liquid fuel production device which produces a liquid fuel from the synthesis gas generated by the gasification furnace; a hydrogen supply pump which supplies hydrogen to a raw material supply area or a synthesis gas discharge area; a temperature sensor which detects a temperature of the gasification furnace; and a controller which switches a hydrogen supply location by the hydrogen supply pump between the raw material supply area and synthesis gas discharge area, based on the temperature detected by the temperature sensor.
Abstract:
A fuel reforming device includes a reformer, a mixer, and a condenser. The condenser includes a first casing, a second casing, a fluid mixture flow portion, and a gas-liquid separator. The first casing extends from a bottom portion side of the condenser to an upper portion side of the condenser opposite to the bottom portion side to serve as an outer shell of a main body of the condenser. The second casing is disposed inside the first casing and extends from the bottom portion side to the upper portion side so that a prescribed space is provided between an inner surface of the first casing and an outer surface of the second casing. The fluid mixture flow portion is provided in the prescribed space so that a gas-liquid fluid mixture passes through the fluid mixture flow portion.
Abstract:
A fuel reforming system to reform a fuel to be supplied to an internal combustion engine includes a reformer, a first filter, and a first flow path. The reformer includes a reforming catalyst to reform a fuel including a hydrocarbon to produce an alcohol and benzoic acid as a by-product using air. The first filter includes a sodium catalyst to trap the benzoic acid produced by the reforming catalyst. The alcohol produced by the reforming catalyst passes through the first filter. Air passes through the first filter to reform the benzoic acid to phenol. The phenol is mixed with the alcohol produced by the reforming catalyst via the first flow path. Alternatively, the phenol is directly supplied to the internal combustion engine as a fuel via the first flow path.
Abstract:
A combustion control apparatus for an internal combustion engine includes a spark plug for performing spark ignition of an air-fuel mixture in the combustion chamber, a plurality of coil pairs for generating spark discharge in the spark plug, and a fuel injection valve capable of injecting atomized fuel. Atomized fuel is injected into the intake passage, and a homogeneous lean air-fuel mixture is formed in the combustion chamber. The air-fuel ratio of the air-fuel mixture in the combustion chamber is controlled to be leaner than a predetermined lean air-fuel ratio. A spark discharge start timing and a spark discharge continuation time period are controlled using the plurality of coil pairs. The spark discharge start timing is set to a timing advanced from the spark discharge start timing for igniting a stratified lean mixture, such that the air-fuel ratio in the vicinity of the spark plug is relatively small.