44 results about "Cool flame" patented technology

To optimize an ignition timing of premixture for improving fuel efficiency regardless of significant change in an EGR ratio or a fluctuation in temperature of recirculated exhaust gas and temperature in a combustion chamber, there is provided a control apparatus for a diesel engine which controls an injector extending into the combustion chamber to execute a main-injection for injecting fuel and increasing the EGR ratio, so as to attain the premixed compressive ignition combustion while the engine is in the premixed combustion region on the low load side. Just before or after a cool flame reaction occurs in the mixture formed by the main-injection, an auxiliary-injection is executed so that the latent heat of vaporization of the fuel decreases the temperature of the mixture to delay the ignition to a timing near TDC. The auxiliary-injection amount is adjusted according to the estimated value of EGR ratio or the change in the crank angular velocity to optimize the ignition timing of the mixture.

The invention provides a low-emission cold flame multistage premixed combustor. The low-emission cold flame multistage premixed combustor comprises an ignition gun and a gas injection pipe. The gas injection pipe is provided with three gas injection outlets, and staged combustion is conducted through combustion areas. A premixed flame is injected at a high speed from the gas injection outlets and rapidly makes contact with a heat transfer pipe, the temperature of the flame is rapidly lowered, and the flame making contact with a refrigerant is reflected back to form a combustion gas curtain, so that combusted waste gas participates in secondary combustion and serves as flue gas to be recycled, and generation of nitrogen oxides is effectively reduced. Through a unique Venturi premixed structure, air and fuel are mixed more sufficiently. By means of the ignition gun which is high in adjusting ratio and wide in air excess coefficient range, the effect that the flame can be successfully built is ensured.

The invention discloses a cylindrical low-nitrogen energy-saving pressure-bearing water pipe boiler which comprises an upper seal head, a shell, a burner distribution head, a water-cooled wall tube bundle, a water-cooled flame tube bundle, a radiation tube bundle, a high-temperature convection tube bundle, a low-temperature convection tube bundle, a descending tube bundle, a lower seal head, an external condenser, a pre-mixer and a matched fan, a water supply pump, a gas valve group, a controller and the like. A burner achieves side face gas feeding, and densely-arranged pipes, a metal pore plate, a ceramic pore plate and the like are adopted for preventing fire return and stabilizing flame. The burner is detachable, thereby facilitating maintenance and repair. The water-cooled flame tubebundle of the burner distribution head is arranged in a plane or convex shape, so that the space of a hearth is utilized to be maximum; and the water-cooled flame tube bundle on a boiler body is adopted to cool the flame, so that the heat distribution problem of the water-cooled burner is solved. Machine-boiler integration of plane and curved surface burners is achieved, the structure is compact,low-nitrogen and ultra-low-nitrogen combustion are achieved at lower excess air coefficients, and the technical monopoly of foreign low-nitrogen burner manufacturers in the field of steam boilers is broken through.

The invention discloses a hearth and combustor cooling type surface cold flame premixing gas boiler. The boiler comprises a hearth, a water cooling combustor is installed at the position of an inlet of the hearth, an outlet of the hearth is connected to a reversal chamber, U-shaped water cooling components are evenly arranged in the hearth in the circumferential direction, inlets of the U-shaped water cooling components are evenly connected to an annular pipeline in the circumferential direction, and water outlets of the U-shaped water-cooling components and a water outlet of the water coolingcombustor are connected to a boiler water tank. According to the hearth and combustor cooling type surface cold flame premixing gas boiler, by the adoption of the water cooling combustor, uniform gascombustion can be achieved, the flame root combustion temperature is reduced while a local high-temperature area is not generated, generation of thermal NOx at the flame root is reduced, and meanwhile, a hearth cooling system is adopted, a U-shaped pipeline cooling structure is arranged, the compact structure and manufacturing economy of the boiler are achieved while the uniform low-temperature atmosphere in the boiler is guaranteed, and generation of the NOx during gas fuel combustion is further remarkably reduced.

The invention relates to a cooling flame low nitrogen combustion device. The device comprises a premixed gas inlet and a combustion chamber, wherein a first heat exchange tube assembly and an igniterin the flow direction of premixed gas are successively arranged in the combustion chamber; the first heat exchange tube assembly is composed of a plurality of outer hexagonal tubes arranged in parallel, and gaps are formed between the adjacent outer hexagonal tubes to allow the premixed gas to pass through; and the position of the igniter opposite to the first heat exchange tube assembly is set insuch a way that the igniter can directly ignite the premixed gas passing through the gaps. Cooling fluid circulates in the outer hexagonal tubes, and the temperature of a flame is reduced duo to thecold wall effect of the cooling fluid, so that the formation of nitrogen oxides is inhibited; and at the same time, when the flame propagation speed is greater than the air flow speed, and the flame returns into the gaps between the outer hexagonal tubes, the energy of the flame becomes smaller and smaller under the cooling effect of the cooling fluid until the flame goes out in the gaps, so thatthe explosion caused by the tempering phenomenon is avoided.

The invention relates to ultra-low-nitrogen combustion equipment with a post-premixing cold flame combustion coupling matrix tube mode wall structure. The ultra-low-nitrogen combustion equipment comprises a fuel gas regulation and control device, an air volume regulation and control device, an air-gas mixing device, a cold flame combustion device, a matrix tube and mode wall device and a comprehensive controller. The fuel gas regulation and control device provides fuel gas for the air-gas mixing device; the air volume regulation and control device provides combustion-supporting air for the air-gas mixing device; the air-gas mixing device conducts jet flow mixing on combustible gas provided by the fuel gas regulation and control device and the combustion-supporting air provided by the air volume regulation and control device, and the combustible gas and the combustion-supporting air are evenly mixed through the air-gas mixing device and then injected into the cold flame combustion device; the mixed gas sequentially passes through a double-layer rectifying plate, a hexagonal heat pipe type cooling fire-retardant tube nest and a flame cooling tube nest in the cold flame combustion device and then enters a combustion chamber for combustion; and after combustion, high-temperature flue gas is subjected to radiation and convective heat exchange in the combustion chamber, then exchanges heat with a medium in the matrix tube and mode wall device and then is discharged into a flue.

The invention discloses a natural gas cold flame horizontal type fire tube steam boiler which comprises a fuel gas valve group (1), an anti-explosion fan (2), a burning head, a hearth (4), a first return stroke thread smoke tube (5), a rear smokebox (6), a second return stroke thread smoke tube (7), a turning smoke chamber (8), an energy saver (9), a condenser (10), a smoke outlet (11), a hearth access door (12), a shell cylinder (13) and a recycling pipeline (14); the burning head is a cold flame burning head; the outlet of the anti-explosion fan is connected with the cold flame burning head;mixed gas is sprayed into the hearth via the cold flame burning head for combustion; the hearth, the first return stroke thread smoke tube and the second return stroke thread smoke tube are arrangedin the shell cylinder; the first return stroke thread smoke tube is directly connected with the back of the hearth; the first return stroke thread smoke tube and the second return stroke thread smoketube are connected in series through the rear smokebox; a single row of water tube bundles is vertically arranged at the front end of the hearth; a mixed gas spray hole (a steel plate is a spray holecarrier) is formed between every two adjacent tube bundles; the energy saver is arranged at the lower part of the shell cylinder and is connected with the second return stroke thread smoke tube through the turning smoke chamber; the condenser is connected with the back of the energy saver; and a smoke outlet is formed in the back of the condenser.

The invention discloses a method for cooling a flame tube of a combustor. A heat dissipater (2) is additionally arranged in an external low-temperature environment of the flame tube (1). When the flame tube (1) works, a cooling agent circulates between a cavity (3) in the wall of the flame tube (1) and the heat dissipater (2) to transfer heat of the wall of the flame tube (1) to the external low-temperature environment. The invention further discloses a flame tube cooling structure adopting the method. The method and the structure have the advantages that the cooling agent and a heat exchanger are adopted for cooling the flame tube, air of an outlet of an air compressor does not need to be used for cooling the flame tube, and the saved air can be used for increasing the temperature of the combustor or cooling a turbine part; the cooling effect is good, and therefore an existing high-temperature alloy can be adopted without using a new high-cost material.

The invention discloses an efficient low-nitrogen water tube boiler bearing pressure. The boiler comprises an upper boiler cylinder, a shell, a combustor distributing head, a film type water cooling wall tube bundle, a water cooling flame tube bundle, a radiation tube bundle, a high-temperature convection tube bundle, a low-temperature convection tube bundle, a descending tube bundle, a lower boiler cylinder, an externally-arranged condenser, a pre-mixer, a matched fan, a water supply pump, a fuel gas valve set, a controller and the like. A closely-spaced tube, a metal hole plate, a ceramic hole plate and the like are adopted in the combustor distributing head, and are used for equalizing flow, preventing fire return and stabilizing flames, detachable design is adopted, and ash can be cleared in time. The water cooling flame tube bundle of the combustor distributing head is arranged in a plane or concave manner, and hearth space can be utilized to the maximum. The water cooling flame tube bundle on a boiler body is adopted for cooling flames, and the problem of heat distribution of a water cooling combustor is solved. According to the boiler, combustor and boiler integration of theplane/concave and convex curve combustor is achieved, the structure is compact, low-nitrogen and superlow-nitrogen combustion is achieved under the low excess air ratio, and technology monopoly of low-nitrogen combustor manufacturers at abroad in the field of steam boilers is broken through.

The invention relates to the technical field of engine calibration, in particular to a calibration method and device for a pilot injection opening angle, equipment and a storage medium. The method is used for reasonably setting the pilot injection opening angle of an engine and improving the low-temperature starting performance of the engine and comprises the steps that after it is determined that the operation mode of the engine is a starting mode and a rail pressure instantaneous value is not smaller than a rail pressure threshold value, a corresponding cylinder interior working medium temperature instantaneous value is obtained based on a cylinder pressure instantaneous value collected by a cylinder pressure sensor; when it is determined that a crank angle instantaneous value collected by a crank sensor is located in a preset crank angle interval and a working medium temperature instantaneous value in a cylinder reaches a working medium temperature threshold value, the crank angle instantaneous value at the moment is determined as a pilot injection opening angle calibration value corresponding to the starting mode; in this way, the temperature of the working medium in the cylinder can be increased through heat released by the cold flame reaction, so that fuel oil rapidly reaches the spontaneous combustion temperature of the fuel oil to be ignited and combusted, the starting time of the engine is shortened, and the low-temperature starting performance of the engine is improved.

The invention provides a forest combustible self-energized combustion trolley based on comprehensive heat management, and belongs to the field of forest fire prevention equipment. The trolley comprises a feeding unit, a combustion unit and a power unit, wherein the feeding unit collects fallen leaves on the ground and feeds the fallen leaves into the combustion unit, the combustion unit comprises a gasification incinerator and an ash laying assembly, a secondary air inlet, a first air inlet, a second air inlet and a feeding port are formed in the side wall of the gasification incinerator, meanwhile, a first metal plate with holes and a second metal plate with holes are arranged inside the gasification incinerator, then the fallen leaves are gasified into flame-retardant ash, the ash laying assembly is arranged below the gasification incinerator and used for cooling flame-retardant ash and laying the flame-retardant ash on the ground, and a heat utilization assembly of the power unit is connected to a flue gas outlet, so that heat of flue gas is utilized to provide electric energy for a driving assembly, and the driving assembly of the trolley converts electric energy into kinetic energy. According to the forest combustible self-energized combustion trolley, the flame-retardant ash can be obtained by reducing the carbon content of the ash content, and the possibility of forest fire can be reduced by laying the flame-retardant ash on the ground.