36results about How to "Lower combustion temperature" patented technology

The utility model belongs to the technical field of burners, and particularly discloses a high-speed low-nitrogen burner which comprises an air shell, a gas pipe, a burning head and a burner nozzle, the gas pipe is arranged in the center of the air shell, the gas inlet end of the gas pipe extends out of the air shell, the burning head is arranged at the gas outlet end of the gas pipe, and the burner nozzle is arranged on the side, close to the burning head, of the air shell. A nozzle is formed in the end, away from the air shell, of the burner nozzle, an inner cavity is formed in the burner nozzle, the combustion head is arranged in the inner cavity, fuel gas and a small amount of air can be mixed through the combustion head to form an oxygen-deficient state, incomplete combustion is carried out in the oxygen-deficient state, the combustion temperature can be lowered, and NOx generation can be reduced. Incomplete combustion enters the inner cavity through the gas outlet and is mixed with excessive air in the inner cavity for combustion, the mixed gas can be fed into the hearth for combustion, CO can be converted into CO2, and NOx and CO generated during combustion of the burner can be efficiently and reliably reduced only through the combination of three simple structures.

The invention discloses a high-temperature-resistant fireproof flexible cable and a preparation method thereof, and belongs to the technical field of fireproof cables, the high-temperature-resistant fireproof flexible cable comprises a first outer sheath, the inner wall of the first outer sheath is provided with a second outer sheath, and the inner wall of the second outer sheath is provided with an armor. The first outer sheath, the third outer sheath, the fourth outer sheath and the fifth outer sheath are designed and are all made of magnesium-containing flame retardant materials, in a magnesium-containing flame retardant performance test, flame spread is low, the released total heat value is low, the tensile strength is high, the smoke density is low, and at the high temperature, magnesium in the magnesium-containing flame retardant can release water due to the chemical characteristic, so that the flame retardant performance is improved. The cable is good for reducing the combustion temperature and inhibiting flame propagation, and has relatively strong fire resistance and high temperature resistance, and when the first outer sheath is combusted, the magnesium-containing flame retardant is generally halogen-free, generates less harmful gas, and is more environment-friendly.

The present invention discloses a burner air intake system for a stove, including a burner head and an air intake valve, wherein two or more ejector tubes are arranged on the burner head, and a plurality of nozzles are arranged on the air intake valve, wherein the nozzles correspond to the ejector tubes one by one, and the nozzles extend into the corresponding ejector tubes respectively; wherein at least two nozzles are provided with air induction holes, and the total areas of the air induction holes provided on different nozzles are different. In the burner air intake system for a stove of the present solution, the total areas of the air induction holes provided on different nozzles are different, thereby introducing different amounts of air, thereby achieving different air-fuel ratios of the mixed gas, and obtaining mixed gas of multiple different concentrations. The burner air intake system for a stove of the present solution can be used to achieve a combustion mode of the burner with alternating thick and thin gases, reduce the combustion temperature, and make the gas burn more fully, thereby suppressing the generation of nitrogen oxides.

The application relates to a partition-injection air-bleed circulation combustion chamber and a liquid rocket engine, wherein the partition-injection air-bleed circulation combustion chamber comprises a combustion chamber body and a partition-injection injector; the combustion chamber body is provided with an oxygen inlet collector, a fuel inlet collector and an air-bleed collector; the partition-injection injector is installed on the upper end of the combustion chamber body and is provided with injection holes; the oxygen inlet collector and the fuel inlet collector are communicated with the partition-injection injector and inject oxidants and fuels into the combustion chamber body through the partition-injection injector; the air-bleed collector is installed on the outer side of the middle part of the combustion chamber body and is communicated with the combustion chamber body; the partition-injection injector is disc-shaped and is divided into an equivalence zone, an oxygen-rich zone and a fuel-rich zone from the center to the outside; a partition ring is fixed to the lower surface of the partition-injection injector; the partition ring is in the form of a ring cylinder structure; the partition ring is located between the oxygen-rich zone and the fuel-rich zone and is used for separating the oxygen-rich zone and the fuel-rich zone.

The present invention belongs to the field of coal energy technology, and in particular to a catalytic improver for raw coal combustion, which is composed of a mixture of metal oxides, iron-containing compounds, metal carboxylates, alumina, rare earths and water, and is characterized in that: the metal oxides include Al 2 O 3 , Fe 2 O 3 , Fe 3 O 4 and MnO 2 ; Iron compounds include FeCl 3 and FeCl 2 ; Metal carboxylates include Mg(CH 3 COO 2 and Na 2 C 2 O 4 ; Alumina is Al 2 O 3 ·3H 2 O; rare earth is La(NO 3 ) 3 The present invention can effectively improve the combustion characteristics of coal, greatly improve the reactivity and combustibility of coal, thereby improving the combustion efficiency of raw coal, reducing energy consumption, and effectively reducing SO in exhaust gas. 2 , CO, and NOx contents, thereby achieving the effect of energy conservation and emission reduction. During boiler operation, the boiler thermal efficiency is increased by 3.11%-3.98%, and the coal saving rate reaches 4-12%, which has good economic benefits.

The invention discloses a clean air separation gas combustion reactor system and an operation method. The system consists of a compression device, an end-stage cooler, a heat storage tank, a cold box, a cryogenic expander, an expansion valve, a fractionation tower, a throttle valve, a reheater and a natural gas boiler. The operation method of the system is an air separation and combustion coupling method. The invention uses waste heat to assist in heating the gas, nitrogen and oxygen, thereby improving the inlet conditions of the natural gas boiler. The system can independently produce oxygen to ensure the normal operation of the natural gas boiler, and at the same time, nitrogen, a byproduct of air separation, is added to serve as reflux flue gas to achieve a clean combustion effect. The purpose of adding a heat storage tank and a reheater is to utilize the waste heat in the air separation process to heat the gas, nitrogen and oxygen entering the natural gas boiler to improve the combustion efficiency. The purpose of adding low-temperature fractionation air separation is to independently produce oxygen required for oxygen-enriched combustion of gas fuel, and nitrogen is used as reflux flue gas to improve the combustion efficiency, thereby meeting the different needs of users.

The invention relates to the technical field of fuels, and provides an aviation composite fuel and a preparation method thereof, and the aviation composite fuel comprises carbamide, glycerol, methanol, a surfactant and a kerosene fuel. The structure of the combustion chamber does not need to be changed, and the aviation composite fuel is improved, so that the nitrogen and carbon emission of combustion is effectively reduced.

The application provides a combined power system based on a methanol fuel cell auxiliary power device and a turbofan main engine, which is applied to the field of aviation power technology and comprises a fuel supply system, a heat exchanger, a preheater, a methanol fuel cell auxiliary power device system and a turbofan engine core system; the fuel supply system is connected with the methanol fuel cell auxiliary power device system and the heat exchanger respectively; the heat exchanger and the methanol fuel cell auxiliary power device system are connected with the preheater; and the preheater is connected with the turbofan engine core system. The methanol fuel cell auxiliary power device can utilize the electric power generated by the fuel cell to drive an electric auxiliary turbocharger to generate high-pressure gas when the main engine is started, so that the high-pressure gas is led to the combustion chamber of the main engine and the combustion efficiency is improved; on the other hand, the electric power generated by the fuel cell can be utilized to preheat the fuel led to the main engine, so that the atomization quality of the fuel is improved and the combustion efficiency is further improved.

The invention relates to the technical field of building materials, and discloses a fireproof and pressure-resistant artificial stone and a preparation method thereof. Alkenyl cyclic organosilicon-modified brucite powder can be chemically cross-linked with vinyl unsaturated polyester resin to form a stable and dense network structure. Magnesium oxide generated by thermal decomposition of brucite can adhere to the surface of the material, absorb smoke and combustibles, and make combustion difficult. The organosilicon element can be decomposed to generate silicon dioxide and other non-combustible or flame-retardant substances during the combustion process, forming an isolation film to prevent oxygen from contacting the combustion products. The carbon-carbon double bonds in the alkenyl cyclic organosilicon-modified brucite powder are opened to participate in the curing process, promote the combination of modified aggregate and resin, and enhance the compactness of the molecular structure. Alkaline magnesium sulfate whiskers are filled in the pores of the brucite powder to generate a synergistic effect, thereby improving the impact resistance and compressive strength of the artificial stone and reducing the cracking tendency.

The utility model relates to the technical field of waste gas catalysis, in particular to an organic waste gas catalytic combustion increasing device which comprises a machine box, and a gas inlet pipe is fixedly arranged on one side of the machine box. The machine box is installed to play a role in fixing the rectangular block, the air inlet pipe is installed to play a role in conveying waste gas into the filtering mechanism, and the filtering mechanism is installed to filter the waste gas through a filter screen in a filter plate during use, so that the effect of removing impurities such as particulate matters, oil stains and water in the waste gas is achieved; the conveying pipe is installed to achieve the effect of conveying filtered waste gas, the heat preservation layer is installed to achieve the effect of keeping the temperature in the machine shell, the ignition device is installed to achieve the effect of heating the waste gas to increase the temperature of the waste gas, and the catalysis plate is installed to achieve the effects of increasing the reaction rate of waste gas combustion and reducing the combustion temperature; and the heat exchange plate is installed, so that the effects of cooling and purifying gas and improving the energy utilization rate are achieved.

The utility model belongs to the technical field of combustors, and discloses a heat storage combustion flat single radiant tube device which is provided with a heat storage type combustor and a flame radiation flat single tube, and flames combusted by the heat storage type combustor are jetted in the flame radiation flat single tube. Formed flue gas flows back into the heat accumulating type combustor along the pipe wall of the flame radiation flat single pipe and is exhausted after heat is absorbed by a heat accumulator; the heat storage combustion flat single radiant tube device integrates combustion, heat transfer, smoke exhaust and heat storage, and during working, air and smoke need to be reversed, and fuel does not need to be reversed; the utility model has the beneficial effects of small volume of installation space in the furnace, compact structure, uniform temperature of the radiant tube wall and the like.

The invention provides a technology for preparing pure sulfur trioxide through three-section conversion of pure oxygen by using double sulfur burning furnaces, and relates to the technical field of sulfur trioxide production, and the technology comprises the following steps: step 1, sulfur burning reaction, step 2, heat recovery, and step 3, condensation separation. The double sulfur burning furnaces are arranged to burn sulfur, the total rated sulfur spraying amount is kept, meanwhile, the burning temperature of a single sulfur burning furnace is reduced to a certain extent, a high-temperature and high-oxygen environment is prevented from being generated in the furnaces, the product yield is guaranteed, meanwhile, related equipment of the sulfur burning furnaces is protected, and the production cost is reduced. The invention also discloses a preparation method of the composite carrier loaded vanadium tungsten molybdenum pentoxide catalyst used in the production process.

The embodiment of the present disclosure discloses a combustion chamber flame tube and a flame tube manufacturing method suitable for a pure hydrogen gas turbine. A specific implementation of the combustion chamber flame tube includes: the flame tube body includes a head cooling section, a heat exchange rib segment and a tail cooling section, the head cooling section is provided with at least one head cooling groove, the tail cooling section is provided with at least one tail cooling groove, the outer side of the heat exchange rib segment is provided with at least one heat exchange rib, the head cooling section includes a connecting assembly, the connecting assembly is used to connect the head cooling section with the combustion chamber main nozzle; the flame tube guide bushing includes a bushing body and a fixing assembly, the bushing body and the fixing assembly are fixedly connected, and the fixing assembly is used to detachably connect the bushing body with the combustion chamber casing; the flame tube body is arranged inside the bushing body, and a preset annular cavity spacing is arranged between the flame tube body and the bushing body; at least one mixing hole is opened on the flame tube body. This implementation can reduce the emission of nitrogen oxides in the combustion chamber.

The application discloses a novel air premixing flue gas internal circulation ultra-low emission gas combustion device and relates to the technical field of burners.The application solves the problem of excessive initial emission of nitrogen oxides of the existing gas boiler.The main flame injection nozzle is externally sleeved with a main flame gas nozzle;the main flame gas nozzle is provided with a plurality of flue gas entraining holes;the air passage end is provided with an air passage necking portion;the end of the duty flame gas pipe extends into the gas mixing cylinder and is provided with a plurality of duty flame short pipes at the end;the duty flame gas pipe is internally provided with a duty flame nozzle;and the air premixing holes are arranged on the front pipe wall of the duty flame nozzle.The application completes the partial air premixing in the duty flame gas pipe, improves the duty class gas combustion speed, introduces the flue gas into the combustion device, increases the inert gas content in the combustion zone, dilutes the oxygen concentration through heat absorption of the flue gas, reduces the combustion speed and temperature, and thus inhibits the generation of NOx.

The invention discloses a device for variable fuel injection timing, sequence and high-pressure constant-pressure injection of diesel engine fuel, comprising a high-pressure oil pump and a high-pressure oil pump seat, wherein a plunger pair consisting of a plunger sleeve and a plunger is installed in the high-pressure oil pump, an oil outlet joint is installed at the upper end of the high-pressure oil pump, an oil outlet valve is installed in the oil outlet joint, a power piston cylinder and a hydraulic cylinder are processed in the high-pressure oil pump seat, an injection pushing mechanism is installed in the power piston cylinder, and the injection pushing mechanism comprises a power piston, and the upper end of the plug rod of the power piston is connected with the lower end of the plunger; an oil inlet pipe and an oil return pipe for providing hydraulic oil to the power piston through a reversing valve are installed on the high-pressure oil pump seat, and a hydraulic piston is arranged in the hydraulic cylinder; oil inlet and outlet holes are opened on the hydraulic cylinder, and the hydraulic piston is meshed with an injection timing adjustment sleeve rack, and the injection timing adjustment sleeve rack pulls the hydraulic piston to rotate so that the injection timing is automatically adjusted with the speed of the diesel engine; and an annular injection groove is processed on the head of the plunger.

The application discloses a combustion chamber air adjusting device of a hydrogen fuel gas turbine, and relates to the technical field of gas turbine combustion chambers, which comprises a compression chamber, one end of which is provided with an air inlet; a combustion chamber fixed at one end of the compression chamber away from the air inlet; a turbine chamber fixed at one end of the combustion chamber away from the compression chamber, and a plurality of injection ports are arranged between the combustion chamber and the turbine chamber; wherein an air flow channel is formed in the combustion chamber, a plurality of adjusting components are uniformly fixed in the air flow channel, one end of the adjusting component extends into the injection port, the adjusting component and the injection port are sealed by an isolation ring, one end of the adjusting component away from the injection port penetrates the combustion chamber and is fixed with a fuel cylinder, the fuel cylinder is fixed obliquely with the combustion chamber, and the adjusting component is coaxially arranged with the fuel cylinder.

The invention discloses a fuel engine operation system structure integrating cooling compressed air and an operation method of the fuel engine operation system structure, and relates to the technical field of new energy and engines. Compressed air can efficiently and quickly store energy and is an energy carrier. The method comprises the following steps that S1, a compressed air tank is adopted as an air supply mechanism for cooling compressed air; s2, cooling compressed air is guided into an engine air cylinder in the early stage of an air inlet stroke or the late stage of a compression stroke, compression of the part of air in the compression stroke is reduced, the temperature of compressed mixed gas is reduced, the combustion temperature of the engine is reduced, engine knocking is reduced, the compression negative work of the engine is reduced, and the air inlet amount of the engine is increased; energy stored by compressed air is released in the expansion stroke to do positive work, the power and heat efficiency of the engine are improved, the NOx generation rate is reduced, and when the engine is in the lean-burn working condition, only a conventional emission aftertreatment system is needed to meet the emission regulation requirement; and S3, compressed air is provided by a multi-stage compressor.

The invention relates to a pyrotechnic solid substance for generating gas, a pyrotechnic composition and a gas generator, comprising an effective composition, the effective composition comprising, by weight, 40%-50% of guanidine nitrate, 6%-48% of basic copper nitrate, 1%-5% of alumina and 5%-15% of at least one coolant prepared from hydrated oxalate, and the pyrotechnic solid substance does not contain a binder component. The pyrotechnic solid substance has the beneficial effects that the pyrotechnic solid substance capable of generating gas, which is composed of the effective compositions, has the characteristics of high gas production rate, high combustion rate, low combustion temperature, low pressure index, small toxicity of released gas and the like, and is particularly suitable for an in-vehicle safety airbag as a passenger protection system.

The utility model relates to a kind of fireproof structure of building deformation joint, belong to deformation joint technical field.The fireproof structure of building deformation joint, comprising: deformation gap, two building walls are combined to form deformation gap, the inside of the deformation gap is provided with cover plate, the both sides of the cover plate are penetrated to the inside of adjacent wall;Fireproof mechanism, the fireproof mechanism is installed in the inside of deformation gap, the fireproof mechanism is set in the below of cover plate;Wherein, the fireproof mechanism includes the fireproof rock wool fixedly connected in the below of cover plate;Combustion medium is gradually consumed in limited space, and combustion temperature is gradually reduced, mixed gas mass enters the inside of top cavity frame, top cavity frame keeps relatively good low-temperature effect, mixed gas mass exchanges heat through top cavity frame, and is discharged to both ends outside, reduces the situation that flame continues to burn fiercely, forms protection to the flame of combustion, and reduces the trend that flame burns surrounding building.

This invention relates to a gas water heater, comprising a combustion assembly, a heat exchange assembly, and an atomizing assembly. The combustion assembly includes an inner shell, an outer shell, and a burner. A combustion chamber is located within the inner shell, with the burner positioned below it. The heat exchange assembly is positioned above the inner shell, and the outer shell surrounds the periphery of the inner shell, with a gap between them forming a sealed cooling channel. This cooling channel communicates with the combustion chamber. An atomizing assembly is located on one side of the outer shell, connecting the cooling channel and the condensate pipe of the heat exchange assembly. This atomizing assembly atomizes the condensate generated by the heat exchange assembly and delivers it to the cooling channel for heat exchange between the outer and inner shells, reducing their temperatures. Part of the atomized condensate can also enter the combustion chamber from the cooling channel, absorbing heat from the burner and evaporating, thereby reducing the burner's combustion temperature and producing less polluting gas.

The present invention relates to the field of polyolefin plastics, and specifically to a glass fiber reinforced modified polyolefin plastic and a preparation method thereof, which is used to solve the problem that the existing glass fiber reinforced modified polyolefin plastic has poor mechanical strength and flame retardant and fireproof performance, which limits its application in some high-performance fields; the preparation method adds organic phosphorus nitrogen modified glass fiber as a reinforcing agent to the polyolefin resin, so that the polyolefin plastic not only has a significant improvement in mechanical properties, but also can maintain good performance under high temperature environment, and the flame retardant performance and fireproof grade are significantly improved, so that it can meet higher fireproof standards. At the same time, the preparation method adopts reasonable production process and technical means to ensure the good combination of glass fiber and polyolefin materials, thereby realizing the comprehensive optimization of plastic performance, significantly improving the performance and application range of polyolefin plastics, and meeting the needs of high-performance applications under various complex environmental conditions.

The invention provides a water-cooled combustion engine, and belongs to the technical field of combustion engines, the water-cooled combustion engine comprises a shell, one side of the outer surface of the shell is fixedly connected with a combustion cavity, the middle part of the back surface of the combustion cavity is fixedly connected with a water tank, and the bottom of the inner side surface of the water tank is fixedly connected with a conveying pipe. According to the water-cooled burner, through the arrangement of a conveying pipe, a heat exchange pipe, a backflow pipe and a water drainage pipe, water in a water tank is conveyed into the heat exchange pipe through a water pump and the conveying pipe, the combustion cavity and the combustion cylinder are rapidly cooled, fuel coking is avoided, the heat exchange pipe is a bent pipeline, and the situation that the combustion stability is affected due to inconsistent temperature is avoided; the water after heat exchange is conveyed into the water tank again through the return pipe, so that the water flows circularly all the time, combustion flames can be stabilized through water cooling, the combustion temperature of the flames can be reduced, emission of toxic substances of nitric oxide is reduced, the environment is not polluted, meanwhile, the resource utilization rate is increased, and the service life of the device is prolonged.

The invention discloses a biomass gas organic heat carrier boiler combustion chamber, and belongs to the technical field of boilers, the combustion chamber comprises a shell internally provided with a hearth, a combustor arranged at the front end of the shell, a furnace arch arranged above the hearth and a tail furnace wall arranged at the tail end of the hearth, and a first oil cooling pipe is arranged in the furnace arch; and a second oil cooling pipe is arranged in the tail furnace wall. The oil cooling pipes are arranged in the tail furnace wall and the furnace arch opposite to flames, heat conduction oil is used for cooling the tail furnace wall and the furnace arch, and the collapse risk of the furnace arch and the tail furnace wall is reduced; the extension lines of the first smoke inlet pipe and the second smoke inlet pipe are tangent to the minimum circle surrounding the flame, after smoke on the two sides enters the hearth, the flame is combusted like cyclone, the temperature field is more balanced, and combustion is more sufficient; the oil cooling pipe serves as an internal supporting structure of the furnace arch and the tail furnace wall, and collapse of the furnace arch and the tail furnace wall is effectively prevented; cooling equipment does not need to be independently arranged, energy is saved, consumption is reduced, and heat conduction oil entering the high-temperature heating surface of the boiler can be preheated.

The application discloses a fire grate, a burner and a water heater, and relates to the technical field of water heaters, wherein the fire grate comprises a fire grate body and a combustion head, the fire grate body is provided with a mixing cavity, a first air inlet channel and a second air inlet channel, the mixing cavity is provided with a fire opening, the exhaust end of the first air inlet channel is communicated with the mixing cavity, the air inlet end of the first air inlet channel forms an injection port, the injection port is used for conveying gas and air to the first air inlet channel, the exhaust end of the second air inlet channel is communicated with the first air inlet channel or the mixing cavity, and the second air inlet channel is used for conveying air to the mixing cavity, the combustion head is arranged at the fire opening, and the combustion head is provided with a plurality of fire holes communicated with the mixing cavity; the technical scheme provided by the application can reduce the generation of thermal nitrogen oxides during combustion.

A multi-stage partition low-nitrogen ammonia gas cyclone burner comprises an internal air assembly, an internal air assembly is a passage of a rear thick and a front thin, an internal cyclone air cylinder is placed inside, and an internal air flow forms an axial cyclone after passing through the cyclone air cylinder; an ammonia gas assembly, an end of the ammonia gas assembly forms an annular gap with the internal air assembly, and ammonia gas uniformly flows into a combustion chamber through the annular gap; an external air assembly, the external air assembly is installed at the end of the ammonia gas assembly, external air flows out radially through a circle of small square holes at the end of the external air assembly, and forms a radial cyclone; a center combustion-supporting assembly, the center combustion-supporting assembly is a thin tube installed inside the internal air passage, and fuel is hydrogen; and an outlet combustion-supporting assembly, the outlet combustion-supporting assembly is a ring channel installed at the end of the external air assembly, a plurality of small nozzles are arranged outside the ring channel, and fuel is hydrogen. After ammonia gas is sprayed out from the annular gap, the ammonia gas can be uniformly mixed with internal and external cyclone air, the combustion-supporting assemblies as a whole form a wrapping range of a bottom high-temperature jet flow and a plurality of external high-temperature points, and ammonia gas can be stably combusted in the range.

The invention discloses a tail gas incineration device and method, and belongs to the technical field of tail gas incineration, the tail gas incineration device comprises an incinerator body and a combustor, the incinerator body is provided with a hearth, and the interior of the hearth is sequentially provided with a first area, a second area and a third area in the axial direction of the hearth; the incinerator body comprises a secondary inlet and a tertiary inlet, the secondary inlet communicates with the second area, mixed gas of secondary air and secondary tail gas is introduced into the second area, the tertiary inlet communicates with the third area, and mixed gas of tertiary air and tertiary tail gas is introduced into the third area; the combustor is arranged at one end of the incinerator body and communicates with the first area, the combustor comprises a containing cavity and a primary air inlet and a primary tail gas inlet, the primary air inlet communicates with the containing cavity and is connected with primary air, and the primary tail gas inlet communicates with the containing cavity and is connected with primary tail gas. The invention aims to greatly reduce the concentration of CO and NOx in the flue gas discharged by the incinerator.

The present invention proposes a device for reducing nitrogen in the flue gas internal circulation of a dimethyl ether gas boiler burner, comprising a primary air duct, a secondary air duct is arranged outside the primary air duct, a fuel outlet pipe of a fuel pipe is arranged inside the primary air duct, the fuel outlet pipe is connected to a graded outlet pipe, a primary fuel outlet and a secondary fuel outlet are arranged on the graded outlet pipe, the primary fuel outlet corresponds to the primary air duct, and the secondary fuel outlet corresponds to the secondary air duct; a smoke return port is arranged on the secondary air duct. The present invention achieves the purpose of dispersing the temperature of the high-temperature zone by inputting fuel in stages and premixing with the air input in stages, thereby reducing the high temperature and the generation of nitrogen oxides; by providing a smoke return port on the secondary air duct, the burned flue gas is swirled into the secondary air duct for re-combustion, thereby further reducing the generation of nitrogen oxides; and the flue gas is recycled, and the heat capacity of the burned flue gas is large, thereby further reducing the combustion temperature and further reducing the generation of nitrogen oxides.

The application provides an engine system and an engine combustion organization method, and relates to the technical field of engines.The engine combustion organization method comprises the following steps: the first injection element is arranged close to the axis of the piston element compared with the second injection element; the injection start time of the second fuel is earlier than the injection start time of the first fuel; the first injection element is used for spraying a plurality of first fuel beams, and the intersection of the plurality of first fuel beams and the piston top defines a first range; the second injection element is used for spraying a plurality of second fuel beams, and the intersection of the plurality of second fuel beams and the piston top defines a second range; the second range is located inside the first range, so that when the first fuel beam develops to the piston top, the second fuel in the second fuel beam is combusted in the space formed between the first fuel beam and the piston top. In this way, the pilot ignition of the first fuel can be realized by less second fuel, and then the replacement rate of 95% is helped to be realized, and then the emission of nitrogen oxides is helped to be reduced.

The utility model belongs to the technical field of combustors, and particularly relates to a low-nitrogen-emission premixing type combustor structure which comprises a shell, an air inlet mechanism, an air adjusting mechanism, a combustion mechanism, a fire stabilizing mechanism, a premixing mechanism and a control cabinet. The air adjusting mechanism comprises an air adjusting driving assembly and an air adjusting assembly. The combustion mechanism comprises an ignition assembly and a combustion assembly. The premixing mechanism comprises a combustion chamber, a smoke mixing disc and a mixing disc fixing pipe. According to the pre-mixing type combustor structure with low nitrogen emission, through the design of the pre-mixing mechanism, fuel gas, air and part of smoke can be fully mixed before combustion, and combustion sufficiency is guaranteed; a combustion chamber, a flue gas mixing disc and a mixing disc fixing pipe in the premixing mechanism are matched with one another, so that flue gas can participate in mixing, the combustion temperature is effectively reduced, and generation of thermal nitrogen oxides is inhibited and reduced; the premixing mechanism is arranged at the combustion mechanism, a mixer does not need to be specially arranged for the combustor, and the size is reduced.

The invention discloses an enhanced heat transfer vertical tube water-cooled gas steam generator, comprising an upper header and a lower header; a tube-type membrane water-cooled wall is arranged between the upper header and the lower header, a gas inlet and a smoke outlet are arranged on the tube-type membrane water-cooled wall, the gas inlet is connected to an air intake bin, a water-cooled plane burner is arranged in the air intake bin, the water-cooled plane burner comprises a water-cooled fire row tube bundle which is surrounded by the tube-type membrane water-cooled wall to form a combustion furnace cavity, an enhanced convection heat exchange tube bundle furnace is arranged in the combustion furnace cavity, the space occupied by the enhanced convection heat exchange tube bundle forms a heat exchange chamber, and the space between the enhanced convection heat exchange tube bundle furnace and the water-cooled fire row tube bundle forms a combustion chamber; the smoke outlet is connected to a tail normal pressure economizer, and the tail normal pressure economizer is connected to a smoke collecting box; the water inlet of the lower header and the water outlet of the tail normal pressure economizer are connected through a pipeline and a water pump. The invention has high heat exchange efficiency, low combustion temperature and smoke exhaust temperature, can achieve low-cost and low-nitrogen emissions, and has a long service life.