163 results about "Stratified combustion" patented technology

The invention discloses a stratified combustion on-line optimization control system of boiler coal dust, comprising a gas sampling system and a data processing system, wherein the gas sampling system comprises a fume sampling probe and a fume component continuous monitoring system. The invention is characterized in that the fume sampling probe comprises a first fume sampling probe arranged at an opening of an A air preheater, a second fume sampling probe arranged at an opening of a B air preheater and a third fume sampling probe arranged in a boiler chamber; the data processing system comprises an industrial computer connected with the fume component continuous monitoring system and provided with a stratified combustion on-line optimization computation module; and DCS data of the industrial computer and a generator set are connected by a data collector. The invention utilizes a support vector machine theory by the method and the method to establish an on-line optimization model to carry out automatic training and optimization so as to obtain combustion optimization condition parameters to guide operation, thereby keeping high operation safety of the boiler, improving operation economical efficiency and reducing the emission concentration and totals of pollutants.

In a starting time in which an air motion is little, a means for heightening the motion is added, from the starting time a stratification combustion operation is enable to carry out, and a discharge of an unburned fuel is minimized. From the starting time of an engine (from the firstly combustion cylinder) it is possible to carry out a stable stratification combustion. In accordance with the stratification combustion in the exhaust air a large quantity of the surplus oxygen remains. In the engine in the exhaust stroke twice (two time) fuel injection is carried out and the after burn phenomenon is caused in the exhaust port and then the exhaust gas temperature can be raised.

An ignition time controller for an internal combustion engine is provided for setting an ignition time such that it can rapidly converge to an appropriate value in accordance with a change in intake characteristics associated with a change in cam phase in either of a uniform combustion mode and a stratified combustion mode in a direct injection type internal combustion engine having a cam phase changing mechanism. The ignition time controller comprises a required torque determining unit for determining a required torque outputted by the internal combustion engine based on an engine rotational speed and an accelerator opening, a fuel injection time determining unit for determining a time at which a fuel is injected into a cylinder, a basic ignition time determining unit for determining a basic ignition time based on the engine rotational speed and the required torque in the uniform combustion mode and based on the engine rotational speed and the fuel injection time in the stratified combustion mode, and a basic ignition time correcting unit for correcting the basic ignition time in accordance with a cam phase deviation between an actual cam phase and a target cam phase.

A valve timing controller for use in a direct injection type internal combustion engine is provided for enabling a valve timing to be appropriately set in accordance with a load on the engine even in a stratified combustion mode. The internal combustion engine has a valve timing changing mechanism for changing a valve timing of at least one of an intake valve and an exhaust valve so that it is operated in a combustion mode switched between a uniform combustion mode in which a fuel is injected into a cylinder during an intake stroke and a stratified combustion mode in which a fuel is injected into a cylinder in a compression stroke. The valve timing controller comprises a required torque determining unit for determining a required torque outputted by the internal combustion engine based on the engine rotational speed and accelerator pedal opening, and a valve timing determining unit for determining the valve timing in accordance with the required torque and the engine rotational speed.

A method of operating an internal combustion engine employs exhaust gas recirculation (EGR) in combination with directly injected gaseous fuels that are burned within the engine in a stratified combustion mode. An engine that employs EGR includes an injector adapted to provide a high pressure quantity of fuel into a combustion chamber within a given pressure range, at a given angle and through a nozzle hole size to help provide for EGR tolerance and, consequently, reduce emissions.

The invention discloses a multi-stage stratified combustion system and a multi-stage stratified combustion method for primary air and secondary air of a boiler. The multi-stage stratified combustion system comprises combustors and air after-combustion devices, which are arranged on the four corners of a furnace chamber; each combustor comprises a secondary air box, at least one primary air tube and at least one primary secondary air spray nozzle; each air after-combustion device comprises an after-combustion air box and at least one after-combustion air spray nozzle; the secondary air boxes and the after-combustion air boxes are connected with a main air duct by the respective air tubes; the primary air tube spray nozzle is divided into a thick primary air spray nozzle and a thin primary air spray nozzle; the primary secondary air spray nozzle is divided into a secondary direct-blowing air spray nozzle and a secondary deviation-blowing air spray nozzle; the after-combustion air spray nozzle is divided into an after-combustion direct-blowing air spray nozzle and an after-combustion deviation-blowing air spray nozzle; and an effect of covering powder by air is formed during the combustion process by virtue of the multi-stage stratification of the primary air and the secondary air. The multi-stage stratified combustion method and the multi-stage stratified combustion method for the primary air and the secondary air of the boiler not only can be used for ensuring the ultralow emission of NOx and improving the combustion efficiency of the pulverized coal, but also can be used for preventing the agglomeration and the high-temperature corrosion of the water-cooling wall and reducing the thermal deviation of the heating area at the outlet of the furnace chamber.

In a starting time in which an air motion is little, a means for heightening the motion is added, from the starting time a stratification combustion operation is enable to carry out, and a discharge of an unburned fuel is minimized. From the starting time of an engine (from the firstly combustion cylinder) it is possible to carry out a stable stratification combustion. In accordance with the stratification combustion in the exhaust air a large quantity of the surplus oxygen remains. In the engine in the exhaust stroke twice (two time) fuel injection is carried out and the after burn phenomenon is caused in the exhaust port and then the exhaust gas temperature can be raised.

An in-cylinder fuel injection internal combustion engine (1) is started up by means of compression stroke fuel injection from the beginning of cranking of the engine (1) to the end of a stratified combustion start-up period TST. If the engine (1) reaches complete combustion during the period, a warm-up operation is begun immediately. If the engine (1) does not reach complete combustion during the period, start-up of the engine (1) is continued using intake stroke fuel injection. By means of this control, stable start-up is assured while suppressing the discharge of unburned fuel during start-up of the engine (1).

A valve timing controller for use in a direct injection type internal combustion engine is provided for enabling a valve timing to be appropriately set in accordance with a load on the engine even in a stratified combustion mode. The internal combustion engine has a valve timing changing mechanism for changing a valve timing of at least one of an intake valve and an exhaust valve so that it is operated in a combustion mode switched between a uniform combustion mode in which a fuel is injected into a cylinder during an intake stroke and a stratified combustion mode in which a fuel is injected into a cylinder in a compression stroke. The valve timing controller comprises a required torque determining unit for determining a required torque outputted by the internal combustion engine based on the engine rotational speed and accelerator pedal opening, and a valve timing determining unit for determining the valve timing in accordance with the required torque and the engine rotational speed.

An engine control device is configured to perform optimum combustion control according to environmental conditions when warming up of a catalyst for emission purification is required. The engine control device performs stratified combustion by the compression stroke injection at the time of startup, when warming up of the catalyst is required. However, under conditions of low air density, stratified combustion by compression stroke injection is prevented, and either homogenous combustion by intake stroke injection is performed, or double injection combustion by intake stroke injection and compression stroke injection is performed. Thus, the engine control device maintains starting properties and prevents adverse effects on engine operability.

The invention discloses a burner of an inner flame gas stove, which consists of a burner body and a fire distributer device; an upper layer fire hole and a lower layer fire hole are arranged on the fire distributer device and the direction of the outlets of the fire holes is inward, and an air channel is arranged or not arranged between the upper layer fire hole and the lower layer fire hole; a single inner cavity or two independent inner cavities is or are arranged; the two independent inner cavities are arranged so that the flame at the upper layer and the lower layer can be regulated independently; while the air channel is arranged so that the air supplementation can be more abundant. The burner utilizes multiple-layer fire holes, stratified combustion and multiple-layer cyclonic flame, and has the advantages of large heat flow, fierce fire power, high heat efficiency, low-CO and low-NOx in smoke gas, no fire hole blocking and the like.

The invention discloses a large-cylinder-diameter gas engine turbulent jet ignition system, a gas supply system and method, and the turbulent jet ignition system comprises a pre-combustion chamber which forms a spatial umbrella-shaped distributed ignition source in a main combustion chamber through a plurality of fluid passages; a sparking plug which is arranged on the pre-combustion chamber and used for igniting mixed gas in the pre-combustion chamber; a pre-combustion chamber gas injection valve which is connected with the pre-combustion chamber through a gas conveying pipeline and a one-way valve and used for injecting auxiliary gas into the pre-combustion chamber in a timed and quantitative mode. The gas supply system comprises a controller and the turbulent jet ignition system, and the controller is used for controlling gas supply of the pre-combustion chamber and fuel supply of the gas inlet channel of the main combustion chamber. Accurate stratified combustion can be formed between the pre-combustion chamber and the main combustion chamber; turbulent jet flow generated by mixed combustion in the pre-combustion chamber can form umbrella-shaped ignition source distribution in the main combustion chamber, the flame propagation distance is effectively shortened, and the combustion speed of mixed gas in the main combustion chamber is increased.