41results about How to "Improve ignition stability" patented technology

A spark plug for an internal combustion engine is provided which includes a hollow cylindrical metal shell with an open end portion to be exposed to a combustion chamber of the engine, a ground electrode joined to the metal shell, a center electrode disposed in the metal housing to define a spark gap between itself and the ground electrode. The spark plug also includes a stream shaper or a stream reflector geometrically formed on the metal shell and/or the porcelain insulator to shape a vortex steam of air-fuel mixture into a stream thereof which is oriented outside the spark plug or serves to decrease the amount of the air-fuel mixture into a pocket between the metal shell and the porcelain insulator. This ensures the stability of ignition of the air-fuel mixture.

A fuel-saving/gas-ignition stable-combustion low-nitrogen swirling pulverized coal combustor comprises a primary air channel, a multi-channel secondary air intake tube and a fuel/gas combustor. A circle of rectifying vanes are evenly distributed on the inner wall of an entryway of a strengthening combustion chamber in the primary air channel, a circle of swirling vanes are evenly distributed on the front outer wall of the fuel/gas combustor, the length from front the end of each swirling vane to the front end of the fuel/gas combustor is larger then or equal to the length of each overall rectifying vane, and the outer diameter of each swirling vane is smaller than the inner diameter of each rectifying vane; the fuel/gas combustor is back-front adjustable and capable of driving relative positions between the swirling vanes and the rectifying vanes to change; swirling intensity of secondary air of the combustor can be adjusted online, a reasonable high-temperature flue gas recirculation zone is formed in a nozzle center of the combustor through adjustment of the swirling intensity of the secondary air, and stable heat sources are provided for ignition and stable combustion of pulverized coal; timely mixing of the secondary air and the pulverized coal is effectively controlled, and a water-cooled wall area at the position of a nozzle is enabled to be in the oxidizing atmosphere, so that scorification and high-temperature corrosion of a water-cooled wall in the area of the combustor can be effectively prevented.

A method for gas atomization of oxygen-reactive reactive metals and alloys wherein the atomized particles are exposed as they solidify and cool in a very short time to multiple gaseous reactive agents for the in-situ formation of a protective reaction film on the atomized particles. The present invention is especially useful for making highly pyrophoric reactive metal or alloy atomized powders, such as atomized magnesium and magnesium alloy powders. The gaseous reactive species (agents) are introduced into the atomization spray chamber at locations downstream of a gas atomizing nozzle as determined by the desired powder or particle temperature for the reactions and the desired thickness of the reaction film.

The invention provides a combustion system of a gasoline direct injection engine and a control method thereof, for improving the combustion and discharge status of a cold starting stage. The combustion system of the gasoline direct injection engine comprises a cylinder cover, a piston, a cylinder sleeve, a spark plug and an oil injector; the cylinder cover is provided with an intake valve, an exhaust valve, an intake passage connected with the intake valve, and an exhaust passage connected with the exhaust valve; the top surface of the piston is provided with an intake valve evading pit corresponding to the position of the intake valve and an exhaust valve evading pit corresponding to the position of the exhaust valve; the spark plug is mounted on one side of the cylinder cover between the intake valve and the exhaust valve and is close to the exhaust valve, the top surface of the piston rod between the downside of the spark plug and the oil sprayer is hollowed to form a concave pit, and the oil injector is arranged under the intake valve and faces towards the concave pit. The control method of the combustion system comprises the steps: A, a twice-injection layered combustion manner is adopted under a cold starting condition; and B, and a single-injection homogeneous equivalence-ratio combustion manner in which gasoline is injected one time in a gas inlet stroke is adopted under the other conditions.

An intensive-classification low-NOx pulverized coal burner comprises a primary air passage, a direct-flow inner secondary air passage and a cyclone inner secondary air passage; pulverized coal is separated by a coal flow equalizer and a pulverized coal separator disposed in the primary air passage into thick-inside thin-outside structure at a spout, blown into a hearth; the inner secondary air passage is provided with a direct-flow air inlet and a cyclone air inlet; secondary air is mixed in the inner secondary air passage and spayed into the hearth; volume of the direct-flow air is controlled through a pull rod, so that cyclone strength of the inner secondary air can be controlled. Each of primary and secondary air outlets is provided with a certainly angular spout expanded-cone structure, real-time mixing of the secondary air and the pulverized coal is effectively controlled, a spout water-cooling wall is in the oxidization atmosphere in a long period of time meanwhile, and slag buildup and high temperature corrosion can be effectively prevented for the water-cooling wall in a burner area. The intensive-classification low-NOx pulverized coal burner has the advantages that combustion stability is high, adjusting performance is good, the burner is well adaptable to various coals, and emission of nitric oxide is low.

The invention discloses a high-efficiency NOx double-vortex rotational flow pulverized coal burner and relates to the technical field of clean energy combustion. The problems that an existing rotational flow pulverized coal burner is poor in coal type adaptation, the NOx discharging inhibiting technology is not complete, and high-efficiency low NOx pulverized coal combustion is hardly achieved aresolved. By means of the high-efficiency NOx double-vortex rotational flow pulverized coal burner, combustion classification is conducted, traditional primary air pulverized coal air flow is divided into an inner strand and an outer strand with the same coal quality or the different coal quality; thick air flow and thin air flow are separate, in other words, an inner conical concentrator and an outer conical concentrator are used for conducting thick and thin separation on inner and outer primary air pulverized coal air flow; classification air distribution is conducted, wherein inner secondary air and outer secondary air which are independently controlled respectively are matched and cooperated with the inner and outer primary air pulverized coal air flow to be sprayed into a furnace, anda center pipe provides center air; and absolute ignition combustion stabilization based on inner vortex rotational flow pulverized coal air flow ignites outer vortex rotational flow pulverized coal air flow constantly, and generation of various kinds of NOx is effectively reduced. The high-efficiency NOx double-vortex rotational flow pulverized coal burner is mainly used for achieving pulverizedcoal ignition combustion stabilization and efficient low NOx combustion.

The invention discloses a pulverized coal jet flow midstream and downstream combustion organization method in a tangent circle pulverized coal combustion boiler. Corresponding wall air nozzles are distributed in a hearth main combustion area of the pulverized coal combustion boiler in a manner of corresponding to primary air pulverized coal combustors, and are formed in the positions, close to the pulverized coal jet flow midstream and downstream positions of outlets, of a hearth water cooling wall, part of hot air is introduced into the wall air nozzles, and is directly sprayed into the corresponding primary air pulverized coal jet flow midstream and downstream interval in a jet flow manner, pulverized coal jet flow midstream and downstream combustion organization is carried out, the oxygen concentration and the pulverized coal combustion rate of the pulverized coal jet flow midstream and downstream interval are improved, and wall attaching happening of the pulverized coal jet flow midstream and downstream interval is directly obstructed. According to the method, pulverized coal jet flow midstream and downstream interval combustion organization and control can be achieved, happening of water cooling wall coking and high-temperature corrosion is prevented, the pulverized coal combustion efficiency is further improved, NOx generation and emissions are reduced, the proper combustion capacity of the pulverized coal combustion boiler for combustion low-volatile lower-ash-melting-point coal is expanded, and the fuel procurement cost is reduced.

The invention discloses an internal contraction and external expansion type nozzle for a swirl pulverized coal burner. The opening section of a nozzle body is in a two-sided battlement guide structure and comprises internal contraction type flow deflectors and external expansion type flow deflectors which are arranged circumferentially in a staggered mode, radiuses of sections of the internal contraction type flow deflectors from the root to the end decrease gradually with the diameter D of the inner cavity of the opening section of the nozzle body serving as the reference, radiuses of sections of the external expansion type flow deflectors from the root to the end increase gradually with the diameter D of the inner cavity of the opening section of the nozzle body serving as the reference, and adjacent internal contraction type flow deflectors and external expansion type flow deflectors are connected through radial transition plates. The internal contraction and external expansion type nozzle has a good guide effect on pulverized coal airflow, direct impact of pulverized coal particles on the nozzle is reduced, the pulverized coal airflow is mixed with external hot smoke intensely for heat exchange when sprayed from the nozzle, strong ignition and stable combustion performances of the pulverized coal are guaranteed, the pulverized coal airflow resistance can be effectively reduced, abrasion to the nozzle is small, and the service life of the nozzle is long. The internal contraction and external expansion type nozzle is particularly suitable for coal-fired boilers of swirl pulverized coal burners with front and back walls in cross arrangement.

The invention provides a mini type turbine engine combustion chamber. The mini type turbine engine combustion chamber comprises an oil conveying ring, an igniter, evaporation pipes, a combustion chamber shell and a combustion chamber ignition cavity. Combustion chamber air inlet holes are formed in the outer wall of the combustion chamber shell. After the lower area of the outer wall of the combustion chamber shell extends into the body and is bent, an inner wall is formed, and an annular U-shaped cavity is formed by the outer wall and the inner wall and is a combustion chamber cavity. The oilconveying ring is fixedly connected to the upper end of the combustion chamber shell, the tail end of an oil conveying pipe is arranged in each evaporation pipe, and the igniter is arranged on the side wall of the combustion chamber shell. The multiple evaporation pipes are fixedly connected in the combustion chamber cavity. The injection action of high-temperature and high-pressure airflow in the combustion chamber is utilized for bringing out fuel oil and air mixed gas in the evaporation pipes, and combustion in the combustion chamber is more uniform; and meanwhile, the independent ignitioncavity is used in the combustion chamber, and ignition stability is improved.

The invention relates to a pre-combustion chamber device capable of improving combustion and reducing thermal loads and an engine. The pre-combustion chamber device comprises a cylinder cover, an intake valve, an intake valve guide pipe, an intake pipe, a pre-combustion chamber body, a gas connecting pipe and a heater. A pre-combustion chamber inner cavity is formed in the pre-combustion chamber body, and the cylinder cover is provided with an intake channel, a cylinder cover air entraining channel and a cylinder cover gas channel. The outer end of the intake channel is communicated with the intake pipe, the gas connecting pipe is connected between the intake pipe and an inlet of the cylinder cover air entraining channel, the heater is connected to the middle of the gas connecting pipe, and the pre-combustion chamber body is provided with a pre-combustion chamber scavenging channel communicated with an outlet of the cylinder cover gas channel and the pre-combustion chamber inner cavity. A pre-combustion chamber cooling channel with the upper end being communicated with the middle of the pre-combustion chamber scavenging channel, and the lower end being communicated with a main combustion chamber of the engine is further formed in the pre-combustion chamber body. According to the pre-combustion chamber device for improving combustion and reducing the thermal loads, the combustion stability of the main combustion chamber of the engine can be improved, and meanwhile the thermal loads of the pre-combustion chamber body can be reduced.

The invention relates to a fuel gas decoupling combustor and a using method thereof. The fuel gas decoupling combustor adopts a partition staged combustion mode of central and peripheral oxygen deficit and central area lean combustion, diffusion type oxygen-deficient combustion with high combustion stabilizing capacity and low heat intensity is adopted in the central combustion area, reliable ignition and low-load stable combustion of the oxygen-deficient combustion area are ensured, the peripheral oxygen-deficient combustion area controls temperature distribution of a combustion chamber by accurately controlling partition mixing of fuel gas and air, the radiation heat transfer capacity is improved, and mixed burnout of the peripheral fuel gas and the main combustion area is promoted. In aword, the problem that the combustion temperature of a diffusion combustion mode is too high in the central stage is effectively solved by the fuel gas decoupling combustor and the using method thereof, the combustion chamber is more uniform in heat intensity, high in flame fullness, high in heat transfer capacity and long in smoke retention time, the combustion efficiency is guaranteed under thecondition of low fan power consumption, meanwhile, generation of thermal NOX is reduced, and decoupling combustion of the fuel gas is achieved.

The invention provides a gas plug valve and a gas stove, and relates to the technical field of stoves. The gas plug valve comprises a valve body, a valve element and a valve rod. A valve cavity is formed in the valve body, and the side portion of the valve cavity communicates with an inner ring passageway and an outer ring passageway. The valve element is rotationally embedded into the valve cavity, a vent cavity is formed in the valve element, and an inner ring vent hole and an outer ring vent hole are formed in the side wall of the vent cavity. An annular boss is arranged on the inner wall of the vent cavity in the circumferential direction of the vent cavity. The valve rod is inserted into the vent cavity from top to bottom, the valve rod is provided with a partition part, when the valve rod is pressed down, the vent cavity can be partitioned into an upper chamber and a lower chamber through the partition part and the annular boss, and the upper chamber and the lower chamber can communicate with each other through a pressure relief passageway. The gas stove comprises a burner and the gas plug valve. The outer ring passageway communicates with an outer ring nozzle of the burner,and the inner ring passageway communicates with an inner ring nozzle. During ignition of the gas plug valve, inner ring fire of the burner is stably ignited, the ignition time is also short when outerring fire needs to be used, and the use experience of a user is good.

The invention aims to provide an enhanced discharge igniter for a marine large-bore gas engine. The enhanced discharge igniter comprises a wiring nut, an insulator, a metal casing, a wiring screw, a central electrode and a side electrode, wherein the metal casing is isolated from the central electrode by the insulator; the central electrode is arranged in a central hole of the insulator through threads and is in tight contact with the wiring screw; the side electrode and the metal casing are independent of each other; the side electrode is arranged on the metal casing through threads; each of the side electrode and the central electrode is provided with a first-order discharge electrode and a second-order discharge electrode; in addition, each of the first-order discharge side electrode and the second-order discharge side electrode of the side electrode is provided with a plurality of secondary electrodes; the plurality of secondary electrodes respectively form discharge circuits with secondary electrodes of the first-order discharge central electrode and the second-stage discharge central electrode of the central electrode. According to the enhanced discharge igniter provided by the invention, the ignition stability of the marine gas engine is improved under lean burn conditions, cyclical variation is reduced, and fuel economy and emission performance of the engine are improved.

Disclosed is a boost control device of a motorcycle starting motor. A microcontroller is used for controlling a boost loop, original voltage of a storage battery is boosted by the boost loop and is supplied to a starting motor with high voltage specifications, and flexible starting control is conducted to the starting motor. The starting motor with high voltage specifications can provide sufficient stable torque force for an engine, so that the starting motor cannot require high current for the storage battery at the moment of starting, the starting smoothness of the starting engine and stability of a motorcycle electric power system and engine starting are improved, and starting noise and abrasiveness of a starting gear set are reduced relatively.

The invention discloses a system and method for heating feed water through reheat steam to achieve deep peak regulation. According to the system and method, a steam-steam heat exchanger serves as a full-load-section operation system, steam behind a rear screen is used for heating cold reheat steam, the reheat steam is used for heating the feed water, and low-pressure steam heated through the rear screen is extracted for heating a primary air pulverized coal pipeline. When the system runs, reheated steam is pumped to heat feed water through the steam-water heat exchanger, the temperature of the feed water and the wall temperature of the water cooling wall are increased, and the combustion condition of the boiler is improved; after the cooled steam absorbs heat in the steam-steam heater, part of the cooled steam is pumped out to heat primary air pulverized coal airflow, the initial temperature of the pulverized coal airflow is increased, and the ignition and stable combustion performance of the boiler is improved; heat of the superheater is guided out through the steam-steam-water heat exchanger, part of heat of superheated steam and reheated steam is used for increasing the feed water temperature and the primary air pulverized coal airflow temperature, and the effects that the low-load ignition stability is improved, the load point for converting the boiler into the wet state is increased, the deep adjustment load of the boiler is reduced, and the unit operation flexibility is improved are achieved.

The internal combustion engine combustion system comprises a combustion chamber, the combustion chamber is composed of a main combustion chamber and pre-combustion chambers, and each pre-combustion chamber is embedded into the top of the main combustion chamber; methanol ejectors II are embedded in the top of the main combustion chamber, and each methanol ejector II is provided with spraying holes in different directions and at different horizontal heights, so that high-pressure methanol spray is sprayed into the main combustion chamber; each pre-combustion chamber is provided with a spark plug and a methanol ejector I, each pre-combustion chamber is provided with through holes with different directions and different horizontal heights, the pre-combustion chambers are communicated with the main combustion chamber through the through holes, jet flame is jetted into the main combustion chamber through the through holes, methanol spray is ignited through the jet flame, and methanol spray combustion is achieved. Methanol spray in the main combustion chamber is ignited through jet flame generated by ignition combustion in the pre-combustion chamber, methanol spray combustion in the main combustion chamber is achieved, and engine combustion is controlled by diffusion flame of methanol.