98results about How to "Improve combustion performance" patented technology

The utility model discloses a stable combustion device for high-pressure rotating sliding arc plasma ignition. The stable combustion device comprises a cathode assembly, a locknut, an insulating supporting ring, a connecting plate, a rear side air inlet, an anode air duct, a rotational flow air chamber and a front side air inlet. The cathode assembly comprises a binding post, a guide rod, a central electric pole, a conical cathode seat and a central cathode inner core which are sequentially connected into a whole in a threaded mode, the cathode assembly is fixed to the center of the anode air duct through an insulating supporting ring, and a multi-groove flow guide ring, a rotational flow air chamber and a rotational flow hole are formed in the front side of the anode air duct; after medium gas is introduced, under the excitation of an electric field, a plasma arc generated between the electrodes slides to the central cathode inner core along the conical cathode seat under the pushing of airflow, and a cycle process of breakdown-stretching-arc quenching-re-breakdown is periodically carried out, so that sliding arc plasma is generated; meanwhile, the plasma arc has the advantages of being high in energy density, improving the chemical reaction rate and the like, and ignition and stable combustion functions are provided for the industrial combustor. The structure is simple, starting is rapid, and the electrode service life is long.

The utility model discloses a liquid fuel ion combustion body which comprises a base, a vaporizing combustion cylinder and a cyclone air inlet cylinder are arranged on the upper top face of the base, an oil inlet is formed in the side face of the base and communicated with the interior of a vaporizing combustion cavity, a circle of annular atomizing combustion net is arranged in the vaporizing combustion cylinder, and the cyclone air inlet cylinder is communicated with the interior of the atomizing combustion net. The size of the atomization combustion net is matched with the inner side wall of the vaporization combustion cylinder, a gap is reserved between the atomization combustion net and the inner side wall of the vaporization combustion cylinder, and a circle of annular protrusion for limiting the atomization combustion net is arranged at the bottom of the base. A circle of annular atomization combustion net is directly designed on the inner side wall of the vaporization combustion cylinder, the area of the atomization combustion net is greatly increased, the attachment area of an oil film is increased, diffusion of liquid fuel is facilitated, the oil film is formed to be spread and combusted on the atomization combustion net, and compared with an original combustion mode of an annular oil way, the combustion effect is better, and the combustion efficiency is improved. And the ion combustion body is easier to process and manufacture.

The invention provides a preparation method of modified nano silicon powder wrapped by a polymer, which comprises the following steps: dissolving a polymer PVDF (Polyvinylidene Fluoride) in an organic solvent N-dimethylformamide DMF (Dimethyl Formamide), carrying out ultrasonic treatment, adding Si powder, adding the Si powder in three times, and then carrying out magnetic stirring, so that nano metal powder and a polymer solution are fully mixed; the preparation method comprises the following steps: adding an energetic oxidant AP into a polymer solution containing nano Si powder according to a mass ratio of PVDF / AP of 1: 3, magnetically stirring, and carrying out ultrasonic treatment to obtain a precursor solution PVDF / AP / Si; and relevant parameters are set, and the coated and modified shell-core type nano composite metal powder is prepared through a spray granulation method. According to the invention, the yield of the silicon-based compound can be improved, the energy and combustion performance of the compound are improved, and the cost of coating silicon powder is effectively reduced. In addition, the PVDF, the AP and the silicon powder are wrapped according to the optimal proportion, so that the energy release efficiency of the compound Si-coated PVDF / AP reaches the maximum.

The invention relates to the technical field of diesel generator control, in particular to a diesel generator set fuel injection control method based on self-adaptive control, which comprises the following steps: acquiring working condition data of a diesel generator set; according to the collected compression pressure fluctuation data, a compression fluctuation model is established, and the compression fluctuation model identifies fluctuation amplitude characteristics, frequency characteristics and wave crest moment characteristics in the compression process in real time; preliminarily calculating the oil injection time, and generating a preliminary oil injection time control signal; and adjusting the preliminarily calculated oil injection time in real time, so that the oil injection time is matched with the optimal stage of the compression fluctuation, and the oil injection time is matched and optimized with the wave peak time characteristics. According to the method, fuel injection control under different rotating speeds and load conditions is effectively improved, the fuel utilization efficiency of the diesel engine is improved, emission is reduced, and the service life of the engine is prolonged.

The invention discloses an activated carbon adsorbent with high adsorption capacity, and relates to the technical field of activated carbon adsorbents for natural gas bottles, the activated carbon adsorbent comprises the following components: an active component A: a specially treated metal organic framework material accounting for 10-20% of the total adsorbent material; the active component B is high-quality activated carbon which is subjected to secondary activation treatment and accounts for 60-80% of the total adsorbent material; the auxiliary agent C is a composite auxiliary agent composed of inorganic alkali metal salt and organic amine, the content of the auxiliary agent C accounts for 5-15% of the total adsorbent material, the inorganic alkali metal salt in the auxiliary agent C is potassium carbonate, the organic amine in the auxiliary agent C is triethylamine, and the metal organic framework material in the active component A is MOFs. According to the activated carbon adsorbent with the high adsorption capacity, through the synergistic effect of the active component A, the active component B and the auxiliary C, the methane adsorption capacity can be expected to be improved by 30-50%.

The invention relates to a foliar fertilizer for improving combustibility of cigar tobacco leaves and a fertilizing method. The foliar fertilizer comprises the following components in percentage by mass: 0.3%-0.7% of an amino acid magnesium fertilizer, 0.03%-0.07% of seaweed essence, 0.04%-0.07% of a boron fertilizer, 0.02%-0.07% of a zinc fertilizer, 0.02%-0.04% of a molybdenum fertilizer and the balance of water. The foliar fertilizer capable of improving the combustibility of the cigar tobacco leaves is formed by taking the magnesium element as a main component and adding the boron element, the zinc element, the molybdenum element and the natural active substance seaweed essence, and under the matching action of the substances, the combustibility of the cigar tobacco leaves is effectively improved, and the first-class tobacco rate is increased. Therefore, the foliar fertilizer and the fertilizing method provided by the invention can effectively improve the comprehensive combustion performance of the cigar tobacco leaves, promote the sufficient combustion of the tobacco leaves, and also have the effect of increasing the output value.

A firewood-saving stove comprises a stove body, a stove pipe is arranged in the stove body, a plurality of gasification through holes are formed in the wall above the stove pipe, a fire grate and an ash box are sequentially arranged at the lower end of the stove pipe, and an integral stove bottom panel is arranged at the lower end of the stove body and used for sealing the stove body. Through holes with straight edges are formed in the left position, the right position and the rear position of the integral furnace bottom panel, and the through holes are communicated with a cavity between the furnace body and the furnace pipe; a baffle plate is arranged at the straight edge of the through hole and is used for limiting the ash box; a plurality of annular grooves are pressed in the center of the whole furnace bottom panel surrounded by the through holes, a plurality of annular cavities are formed between the annular grooves and the outer bottom face of an ash box placed on the whole furnace bottom panel, and a gap is reserved between the upper end of the ash box and the fire grate. According to the utility model, the integral furnace bottom panel is welded with the furnace body, so that the primary air inlet quantity flowing into the fire grate and the secondary air inlet quantity flowing above the furnace pipe can be more accurately and effectively controlled according to the opening and closing size of the ash box, the combustion is sufficient, the pollution to the environment is reduced, and the operation environment of cooking personnel is better.

The invention relates to the field of commercial kitchenware, and more specifically to a burner that uses a plurality of fire distributors and a combustion bowl on a tray to perform work. The fire distributor is a cylindrical tubular structure, with a tube wall, an upper closed end and a mixed gas inlet at the bottom. A fire hole is arranged at a lower position of the tube wall, a distribution chamber is inside the fire hole inlet, and a combustion reaction zone is outside the fire hole outlet. The fire distributor is arranged in the middle of the combustion bowl, and the combustion bowl is a plate-shaped imitation structure. The bottom of the combustion bowl is flat and the periphery is tilted upward. A fire distributor and a combustion bowl form a combustion work unit. A plurality of combustion work units are distributed at a certain interval and arranged on a radiation plate. The periphery of the radiation plate is provided with an upwardly tilted wall. The premixed gas flowing out of the fire distributor is promoted to realize a high-intensity combustion reaction under a very small space condition in the combustion bowl, and the high-temperature and high-volume-density combustion flame and heat can be attached to the surface of the cookware at a short distance for high-efficiency heat conversion.

The present invention provides a pulverized coal burner for ignition and stability and an ignition method, belonging to the technical field of thermal power generation, the pulverized coal burner for ignition and stability comprises an ignition gun, an inlet section, a pre-combustion chamber and a flame transmission tube; a combustion zone and a secondary air channel for sending secondary air into the combustion zone are arranged in the pre-combustion chamber; the front end of the inlet section extends into the pre-combustion chamber and is aligned with the combustion zone, and the rear end is located outside the pre-combustion chamber as a primary air inlet; the ignition gun is installed at the center of the front end of the inlet section, and the front end extends into the pre-combustion chamber and is aligned with the combustion zone; the rear end of the flame transmission tube is connected to the front end of the pre-combustion chamber, and is used to send the pulverized coal flame burning in the combustion zone to a preset position in the main burner, and meet with the pulverized coal airflow of the main burner. The present invention uses pulverized coal as fuel, which is consistent with the existing fuel of the power plant, can completely replace the oil burner and the plasma ignition device, can realize the ultra-low load stable combustion and flexibility adjustment function of the power plant boiler, and the thermal power plant does not need to use oil as fuel.

The utility model discloses a firewood stove grate bridge structure, and belongs to the field of stoves and cooking bench equipment. The firewood stove grate bridge structure is arranged in a cooking bench and is characterized in that the firewood stove grate bridge structure is composed of a concave bottom plate, a C-shaped baffle and a grate bridge body, the middle of the concave bottom plate is in an arc-shaped concave shape downwards, and the grate bridge body is arranged in the middle of the concave bottom plate; the C-shaped baffle is horizontally placed and fixed on the concave bottom plate, and a C-shaped notch of the C-shaped baffle faces the fuel adding opening; an ash bin is arranged under the grate bridge body, and a panel and cookware are arranged above the C-shaped baffle. The furnace bridge structure of the firewood stove adopts the concave bottom plate and the C-shaped baffle to form the hearth, and is simple in structure and low in production cost. The concave bottom plate is movably connected with the furnace bridge body, and when the hearth needs to be cleaned, the furnace bridge body is taken down to quickly discharge ash at one time. And the hearth formed by the concave bottom plate and the C-shaped baffle is beneficial to maintaining the temperature of internal fuel and secondary combustion, so that the combustion effect of the firewood stove is very good.

The invention discloses a flue gas combustion device, comprising a flue gas combustion chamber, a flue gas chamber, an oxygen distribution chamber and a dust chamber are arranged at the bottom of the flue gas combustion chamber, the flue gas chamber is divided into a flue gas chamber 1 and a flue gas chamber 2 by a flue gas chamber partition, the tops of the oxygen distribution chamber, the flue gas chamber 1 and the flue gas chamber 2 are connected with the inside of the flue gas combustion chamber, the flue gas chamber 1 is connected with the upper end of the pyrolysis chamber of the garbage pyrolysis gasification furnace through a flue gas pipe 1, the flue gas chamber 2 is connected with the upper end of the drying chamber of the garbage pyrolysis gasification furnace through a flue gas pipe 2, and the flue gas chamber 2 is connected with the upper end of the storage chamber of the garbage pyrolysis gasification furnace through a flue gas pipe 3. The invention draws flue gas from the pyrolysis chamber, the drying chamber and the storage chamber of the garbage pyrolysis gasification furnace respectively through the flue gas pipe 1, the flue gas pipe 2 and the flue gas pipe 3, and then mixes and burns in the flue gas combustion chamber, and completely burns with excess oxygen, the temperature in the furnace is stable and high temperature, and toxic and harmful gases such as dioxins are basically burned out, which effectively ensures that the flue gas meets the standard and is cleanly discharged.

This invention discloses a nicotine-resistant pectin lyase mutant and its application in tobacco leaf treatment. Using pectin lyase PL6 as the starting enzyme, this invention designs and optimizes mutation sites, designing single-site saturation mutations based on the two hydrogen bond formation sites between the enzyme and nicotine, Lys-107 and Asp-84, to construct mutants. The pectin lyase mutants D84A and K107R of this invention retain 83.63% and 81.30% of their enzyme activities at a 1% nicotine concentration, respectively. Spraying tobacco leaves with D84A and K107R enzyme solutions significantly improves tobacco leaf quality due to pectin degradation.

The invention relates to the field of energetic materials, in particular to a preparation method and application of core-shell structure nano-copper coated micron aluminum. Copper ions are reduced into nano-copper by utilizing the reducibility of aluminum, and the nano-copper is uniformly deposited and coated on the surface of micron aluminum powder, so that composite particles with core-shell structures are prepared. A reducing agent, a complexing agent, a protective agent and a surfactant do not need to be added in the whole process, introduction of non-propellant components is avoided, efficient and low-cost preparation is achieved, and aftertreatment operation is simpler. According to the prepared composite particles, the content of active aluminum is increased, the combustion performance and the oxidation heat release amount of aluminum are enhanced, the oxidation resistance and the catalytic capacity of the composite particles are improved, and the composite particles have good compatibility with other components of the propellant.

This invention discloses a graphene oxide / carbon nanotube-based coal combustion catalyst, its preparation method, and its applications, belonging to the field of catalytic combustion technology for efficient coal utilization. First, graphene oxide is used as a carrier, and then carbon nanotubes and manganese oxide are grown on its surface in a one-step process using condensation and redox reactions, followed by co-firing with coal. The graphene oxide / carbon nanotube-based combustion catalyst prepared by this invention effectively improves combustion efficiency, reduces the ignition temperature of coal, and lowers the reaction activation energy, resulting in significant economic benefits and broad application prospects.

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.

This invention provides a biomass fuel and its preparation method, belonging to the field of waste utilization technology. This invention mixes different waste materials to prepare biomass raw materials, and simultaneously utilizes microbial strains to transform the organic flame retardants contained in the waste raw materials into new flammable agents through biochemical reactions. The prepared biomass fuel has high calorific value, low smoke and dust, and excellent combustion performance, making rational use of various waste materials, and is environmentally friendly, efficient, and energy-saving. The results of the embodiments show that the biomass fuel prepared by this invention has a calorific value of 35.6 MJ / kg, a calorific value of 4100 cal / g, a combustion efficiency of 99.1%, and low smoke and dust.

The utility model discloses a windproof furnace frame which comprises a conical windproof cover and an adjusting support frame, a plurality of vent holes communicated with inside and outside are obliquely formed in the outer wall of the conical windproof cover, supporting strips are arranged on the inner side of the conical windproof cover, and a supporting plate is further connected to the bottom face of the conical windproof cover; and the adjusting support frame is detachably connected with the support strip to form a cookware support structure with a smaller inner diameter. The ventilation holes are obliquely formed in the conical windproof cover, the phenomenon that wind directly blows into the furnace body of the portable gas stove to affect normal fuel can be effectively avoided, wind power can be weakened when the wind enters the conical windproof cover, meanwhile, sufficient ventilation in the conical windproof cover is guaranteed through the ventilation holes, the fuel can make full contact with the air, and the fuel combustion effect is good; the supporting strips are detachably matched with the adjusting supporting frame, the application range of the stove frame can be widened, small-size cookware can be conveniently and stably placed on the stove frame, outer flame heating can be kept in the cooking process, the heating effect is good, and the utilization rate of fuel is further increased.

The invention discloses a nicotine-tolerant pectate lyase mutant and an application thereof in tobacco leaf treatment. According to the invention, pectin lyase PL6 is taken as a starting enzyme, mutation sites are designed and optimized, and single-site saturated mutation is designed according to two sites Lys-107 and Asp-84 of hydrogen bonds formed by enzyme and nicotine, so that a mutant is constructed. The enzyme activity of the pectate lyase mutants D84A and K107R still remains 83.63% and 81.30% under the condition that the nicotine concentration is 1%; d84A and K107R enzyme solutions are sprayed on the tobacco leaves, and the pectin is degraded, so that the quality of the tobacco leaves is remarkably improved.

The invention relates to the technical field of sewage treatment and biological energy, and particularly discloses a method for converting sewage into biofuel for power generation. According to the method, a multi-factor synergistic system containing an inducing factor, a phagocytosis factor and a powdered sugar factor is generated through photosynthetic induction, the inducing factor destroys harmful microorganisms, the phagocytosis factor fixes radioactive substances, germs and viruses, and the powdered sugar factor serves as a carbon value locking precursor; organic pollutants are directionally converted into alcohol clean energy carriers by utilizing a multi-factor synergistic system, and meanwhile, fixed capture of the pollutants is completed; the carbon value is locked by a carbon value locking agent to generate a fixed carbon mixture, and the fixed carbon mixture is dehydrated and dried to obtain the high-purity biochar fuel. Unification of harmless treatment and energy utilization of the radioactive sewage is realized, and the limitation that the radioactive sewage cannot be treated in the traditional technology is broken through.

The utility model discloses a kind of coal powder boiler furnace combustion optimization device, it is related to coal powder boiler technical field, including arc clamping plate, hang installation monitoring unit and feeding control unit.The utility model has reliable hang installation monitoring unit, can install the device stably in the outside of boiler furnace, industrial camera obtains the image of furnace internal flame through high-temperature explosion-proof glass, monitoring computer is burned by analyzing the combustion condition and flame spectrum of flame, and then realize the real-time monitoring of the combustion condition in furnace, find digital basis to combustion diagnosis and optimization in combination with combustion related theory;And having reliable feeding control unit, controller is adjusted to the feeding speed of coal powder by the speed of motor one control, to adjust;Controller is adjusted to the spacing between two crushing rollers by hydraulic cylinder, and then control the crushing fineness and combustion effect of coal powder, to complete the adjustment optimization of furnace combustion condition.

The application discloses a cyclone combustion system of a wing wall furnace boiler, wherein the lower furnace, the main combustion area furnace and the upper furnace all comprise a front wall, a right side wall, a back wall and a left side wall; the front wall, the right side wall, the back wall and the left side wall of the main combustion area furnace are all provided with inclined wing walls between two adjacent sides; each of the four wing walls is provided with a wind distribution chamber; each of the four wind distribution chambers is provided with a burnout air device and two or more layers of cyclone pulverized coal burners from top to bottom; the axes of the burner nozzles of the cyclone pulverized coal burners of the same layer in the four wind distribution chambers are arranged in a diagonal line in pairs; and the cyclone pulverized coal burners of the same layer in the four wind distribution chambers are all connected with the same coal mill; the application can improve the self-stable combustion capacity, the uniformity of the airflow in the furnace and the flame fullness, avoid the flame brushing the wall, realize the good combustion air power flow field organization in the furnace, precisely control the smoke temperature deviation, ensure the safe operation of the large-capacity high-parameter boiler and better meet the high-index requirement of the new generation of coal power technology.

The utility model provides a hydrogen supply mechanism of a diesel engine, which relates to the technical field of diesel engines and comprises a shell body, the shell body comprises a left shell, and a first insulating sheet is arranged on one side of the left shell. According to the utility model, the generated hydrogen is supplied into the cylinder of the engine and is mixed with diesel oil for combustion and acting, and the combustion rate of the hydrogen is higher than that of the diesel oil, so that the hydrogen can be quickly ignited and the diesel oil can be quickly ignited after compression ignition, and the combustion performance is improved, so that the diesel oil can be quickly ignited and fully combusted; therefore, harmful substances are reduced, the emission performance of the engine is improved, and environmental protection is facilitated; meanwhile, the combustion product of hydrogen is only water, so that the environment is not polluted; in addition, diesel oil is rapidly ignited and fully combusted through hydrogen, and under the condition that the same power is output, the injected diesel oil fuel is reduced, and the fuel economy of the diesel engine is improved.

The utility model discloses a combined incense and candle bamboo stick core, which belongs to the technical field of incense and candle production, and comprises a plurality of bamboo canes, the bamboo canes are combined to form a cylindrical stick body, the center of the stick body is provided with a combustion hole, the bamboo canes are fixedly connected with one another, the surfaces of the bamboo canes are smooth surfaces, and the cross sections of the bamboo canes are semicircular or fan-shaped. According to the utility model, the rod body consists of a plurality of bamboo strips, so that when a certain single piece is bent under the influence of contraction, the plurality of pieces are mutually balanced, and the bending can be effectively avoided. Through the arrangement of the combustion holes, ventilation is facilitated when the incense or the candle is combusted, so that oxygen is sufficient.

The invention discloses a production method of a flame-retardant antistatic CPP film. The CPP film is composed of an outer surface layer, a base layer and an inner surface layer. The outer surface layer is prepared from PP (polypropylene), HDPE (high-density polyethylene), carbon black, ammonium polyphosphate and dipentaerythritol; the base layer is composed of PP, LDHs, ammonium polyphosphate, pentaerythritol and a silane coupling agent; the inner surface layer is composed of PP, HDPE, carbon black, ammonium polyphosphate and dipentaerythritol. The flame-retardant antistatic plastic has a good flame-retardant effect, is antistatic, and also keeps relatively high bending strength and notch impact strength.

The invention relates to a marine dual-fuel diesel engine waste heat recovery system, and relates to the technical field of marine diesel engines, the marine dual-fuel diesel engine waste heat recovery system comprises a first tail gas heat exchange box and a second tail gas heat exchange box which are used for recovering heat of high-temperature tail gas of a diesel engine, and a mixing chamber connected with the first tail gas heat exchange box through a heat exchange assembly is arranged on the side of the first tail gas heat exchange box; the mixing chamber is used for mixing gas fuel and air and preheating mixed gas, a combustion chamber is arranged on the side of the mixing chamber, and a heat return gas box connected with the second tail gas heat exchange box through a heat exchange assembly is arranged on the side of the second tail gas heat exchange box; the system further comprises a wastewater treatment barrel used for treating domestic wastewater on the ship and washing tail gas, and the tail gas of the first tail gas heat exchange box and the tail gas of the second tail gas heat exchange box are input into the wastewater treatment barrel through pipelines. The system can fully recycle waste heat in tail gas of the diesel engine and cooling water, can independently preheat gas fuel and air so as to improve the combustion performance, and is suitable for being used in the dual-fuel diesel engine.

The invention relates to a double heat accumulating type heating furnace and method for ammonia hydrogen-doped combustion, and belongs to the technical field of heat accumulating type heating furnaces. The double heat accumulating type heating furnace comprises a heat accumulating type combustor system, and a fuel channel / flue gas channel and an air channel / flue gas channel are symmetrically arranged on the two sides of a furnace body of the heating furnace; a first heat storage chamber filled with a fuel channel heat storage body is arranged in the fuel channel / flue gas channel, and a second heat storage chamber filled with an air channel heat storage body is arranged in the air channel / flue gas channel; the gas supply system is connected with the fuel channel / flue gas channel and the air channel / flue gas channel through a reversing system, and ammonia fuel and combustion-supporting air are alternately introduced into the gas supply system; the smoke exhaust system is connected with the fuel channel / smoke channel and the air channel / smoke channel through a reversing system and alternately exhausts smoke; and an ammonia decomposition catalyst layer is loaded in the first heat storage chamber. According to the invention, flue gas waste heat is utilized to drive ammonia gas to crack to produce hydrogen, stable combustion and low-nitrogen emission of ammonia-hydrogen mixed fuel are realized, and thus energy conservation and emission reduction of an industrial furnace are realized.

The invention discloses a low-load stable combustion device of a pulverized coal fired boiler, which relates to the field of combustors and comprises nozzles arranged at four corners of the pulverized coal fired boiler, the air inlet ends of the nozzles are connected with pulverized coal pipe elbows, and the air outlet ends of the nozzles are communicated with the interior of the pulverized coal fired boiler. And primary air carrying pulverized coal in the pulverized coal pipe elbow enters from the air inlet end of the nozzle and is discharged into the pulverized coal boiler from the air outlet end of the nozzle. According to the low-load stable combustion device for the pulverized coal fired boiler, primary air is shunted through cooperation of the concentration cover and the light phase groove, pulverized coal entering the gathering pipe can be concentrated under the cooperation effect of the air groove and the gathering cover, the content of the pulverized coal in airflow exhausted from the gathering pipe is higher, the flow speed is higher, and meanwhile under the cooperation of the electric heating strip, the combustion efficiency is improved. According to the pulverized coal boiler, the ignition point of pulverized coal entering the pulverized coal boiler from the gathering pipe is effectively reduced, the ignition point is advanced, the pulverized coal can be better ignited, low-concentration pulverized coal flowing around can be ignited, and therefore better stable combustion can be conducted on the pulverized coal boiler.

The utility model provides a kind of furnace end structure and stove body, including furnace end inner container and furnace end shell, the furnace end inner container cover is located on the furnace end shell, furnace end inner container and furnace end shell bottom are provided with fuel through-hole, the furnace end inner container sequentially includes wind ring, air ring piece, first air ring wall and mixing ring from top to bottom, the bottom of wind ring is connected to the outside edge of air ring piece, the top of first air ring wall is connected to the inside edge of air ring piece, the bottom of first air ring wall is connected to the top of mixing ring, the outside of air ring piece is located on the furnace end shell, air ring piece is provided with multiple first air holes in vertical, the furnace end structure further includes vaporization core, the utility model structure is simple and can realize good combustion effect, realizes the reduction of furnace end cost.

The present invention relates to a jet fuel composition obtained from renewable feedstock comprising, relative to the total volume of the composition: a. 50-90% by volume of at least one paraffin matrix obtained from the hydrotreatment of esters and fatty acids, from the Fischer-Tropsch process or from the process for producing jet fuels from alcohols, and comprising, relative to the total weight of the paraffin matrix, a. 30-90% by volume of at least one paraffin matrix obtained from the hydrotreatment of esters and fatty acids, from the Fischer-Tropsch process or from the process for producing jet fuels from alcohols; the present invention relates to a method for producing a biofuel comprising: a. At least 90% by weight paraffin, b. 10-50% by volume of at least one C8-C16 cycloalkyl derived from the hydrogenation of a C8-C16 aromatic matrix corresponding to a C8-C16 fraction of a biofuel produced by a process for converting at least one C1-C6 bioalcohol into a fuel, b. At least 90% by weight paraffin, b. 10-50% by volume of at least one C8-C16 cycloalkyl derived from the hydrogenation of a C8-C16 aromatic matrix, the invention relates to an aromatic substrate comprising at least 60% by weight, relative to the total weight of the aromatic substrate, of an aromatic compound comprising at least 50% by weight, preferably at least 80% by weight, of benzene substituted with at least m methyl groups, m being an integer from 1 to 3, and optionally with n C2-C5 alkyl groups, n being an integer from 1 to 3, the jet fuel composition comprises from 10 wt% to 49 wt% of a naphthenic compound relative to the total weight of the composition.

The invention discloses a swirler flow test device and method, and belongs to the technical field of aviation gas turbine engines, the swirler flow test device comprises a pressure stabilizing cylinder and a swirler test piece, the input end of the pressure stabilizing cylinder is used for inputting high-pressure air, and the swirler test piece is arranged at the output end of the pressure stabilizing cylinder; the swirler test piece comprises a first-stage swirler clamp and a second-stage swirler clamp for fixing a second-stage swirler; a simulation flow channel corresponding to the first-stage swirler is arranged at the center position of the first-stage swirler clamp, a first-stage swirler plug used for plugging the first-stage swirler is arranged on the end face of the first-stage swirler, and a second-stage swirler plug used for plugging the second-stage swirler is arranged on the end face of the second-stage swirler; the second-stage swirler is provided with a venturi structure, the molded surface of the simulation runner is the same as the venturi structure of the second-stage swirler, and the throat diameter of the simulation runner is equal to the throat diameter of the venturi structure of the second-stage swirler. The method has the advantage that the swirler flow testing precision is improved.