490 results about "Staged combustion" patented technology

The invention discloses an ammonia-coal co-combustion burner which comprises a plasma pulverized coal pre-combustion level module, an ammonia two-level combustion module, a pulverized coal main combustion level module and an air classification secondary air module. Plasma is generated by discharging between electrodes in the plasma pulverized coal pre-combustion stage module, pulverized coal carried by primary air is combusted through a plasma fire core area to generate first pulverized coal flame, and the first pulverized coal flame ignites ammonia fuel on the upper stream of the ammonia two-stage combustion module to generate stable ammonia-rich flame. Combustion products and unburnt reactants are mixed with downstream air in the ammonia two-stage combustion module to generate lean-ammonia flame for heating pulverized coal in the pulverized coal main combustion stage module to generate second pulverized coal flame, and the pulverized coal and ammonia gas are promoted to be fully combusted in the air classification secondary air module through secondary air, so that stable combustion of ammonia-coal mixed fuel is realized; the problems that ammonia coal combustion is unstable, NOx emission is too high and ammonia escapes are effectively solved.

The utility model discloses a multi-stage split energy-saving combustion device for liquid fuel, the energy-saving combustion device is composed of a combustion cylinder, an ion combustion body and a combustion body installation box in sequence from top to bottom, the upper end of the ion combustion body is fixedly connected with the combustion cylinder, the lower end of the ion combustion body is provided with an impeller air inlet channel, and the combustion cylinder is fixedly connected with the combustion body installation box. The impeller air inlet channel is located in the combustion body installation box, the combustion body installation box is of a hollow cavity structure, and a fan air inlet and an oil inlet hole are formed in the side face of the combustion body installation box. Compared with the prior art, the atomization combustion mode of an original electronic injection fuel stove is changed essentially, atomization of a high-pressure atomization nozzle is not needed, high-temperature vaporization combustion of liquid fuel is achieved in the first-stage combustion cavity, stable combustion and sufficient vaporization are achieved in the second-stage combustion cavity, and sufficient combustion and heating are achieved in the third-stage combustion cavity. The energy consumption is lower, the heat utilization rate is nearly doubled, the safety is higher, the independence is good, and the applicability is wide.

The invention relates to the field of blast furnace pulverized coal preheating. A blast furnace pulverized coal preheating system comprises a coal injection workshop, a nitrogen heater, a common pulverized coal heater, a compressed nitrogen tank, a blast furnace, an oil storage tank, an expansion tank, a waste heat exchanger, a heat conduction oil pump, a PLC control system and a sound-light alarm device. Pulverized coal discharged from a coal injection workshop is heated in a common pulverized coal heater through waste heat of a blast furnace, and the heated pulverized coal enters the blast furnace to be combusted. The combustion characteristic of the preheated pulverized coal is remarkably improved, and the pulverized coal can be quickly combusted after entering a main combustion chamber of the blast furnace, so that the conventional three-section combustion process of heating, ignition and combustion is broken through.

The invention discloses a digital twinning method and system for staged combustion of a coal-biomass fluidized bed. The method comprises the following steps: establishing a comprehensive database comprising three-dimensional simulation data and operation data of a coal-biomass fluidized bed boiler; modeling and coupling the gas phase and the particle phase by using a neural network to obtain a coal-biomass combustion model which is used for predicting a temperature field, a pressure field and a velocity field of the coal-biomass fluidized bed boiler; and finally, integrating the coal-biomass combustion model with a boiler PLC system of the coal-biomass fluidized bed to realize data transmission, so as to obtain a coal-biomass combustion digital twinborn model and realize real-time control and dynamic optimization. On-line real-time prediction of the boiler is achieved, and long-term updating of the model and continuous improvement of the intelligent level are achieved through continuous accumulation and dynamic training of operation data.

A gas turbine engine for an aircraft, including: staged combustion system having pilot fuel injectors and main fuel injectors, staged combustion system being operable in pilot-only range of operation and pilot-and-main range of operation; and fuel delivery regulator arranged to control delivery of fuel to pilot and main fuel injectors. Fuel delivery regulator arranged to receive fuel from a first fuel source containing a first fuel having a first fuel characteristic and a second fuel source containing a second fuel having a different second fuel characteristic. The fuel delivery regulator is arranged to deliver fuel to the pilot fuel injectors during at least part of the pilot-only range of operation having a different fuel characteristic from fuel delivered to one or both of the pilot and main fuel injectors during at least part of the pilot-and-main range of operation. A method of operating a gas turbine engine is also disclosed.

A combustor component is disclosed comprising a combustion chamber, which comprises an oxidant inlet configured to receive a gas flow of an oxidant, a fuel inlet configured to receive a gas flow of a fuel into the combustion chamber, and a gases outlet configured to allow passage of a flow of exhaust gases from the combustion chamber. The combustor component is configured to facilitate separation of the gas flows of the oxidant and the fuel entering the combustion chamber prior to combustion of the fuel with the oxidant. A combustor assembly comprising a plurality of combustor components for staged combustion of a fuel with an oxidant, and related systems and methods for control and use of the combustor assembly, including in calcination processes, are also disclosed. A pyrolysis component, a pyrolysis assembly comprising a plurality of pyrolysis components, and related systems and methods using the pyrolysis component are also disclosed.

The invention discloses a flue gas compensation type pulverized coal wide-load stable combustion system based on staged combustion and intelligent regulation and control and a control method, and belongs to the technical field of coal-fired power generation. The system is composed of a combustor, an intelligent control module and a flue gas backflow module, the combustor adopts a double-ring fuel channel design, an inner ring injects high-concentration pulverized coal and is provided with an adjustable swirler, and pulverized coal-flue gas mixed airflow is introduced into an outer ring; the intelligent control module predicts a load through an LSTM neural network, and realizes accurate matching of air and coal in combination with PID adjustment; and the flue gas backflow module adopts an oxygen concentration adjustable technology to maintain the combustion intensity. Under the working condition of 30%-40% low load, the system achieves the stable combustion effect that the flame center temperature is stabilized at 920 + / -20 DEG C by means of optimizing the proportion of inner ring pulverized coal to 75%-85%, increasing the primary air temperature to 145-170 DEG C, compressing the proportion of secondary air to 20%-30%, strengthening a swirling flow field to 45 degrees and the like in cooperation with flue gas backflow with the oxygen concentration of 23%-25%, and has the advantages of efficient combustion and low emission.

The invention belongs to the technical field of energy conservation and environmental protection, and discloses a cement kiln system for coupling oxygen enrichment and staged combustion by using alternative fuel in a large proportion, which comprises a circulating fluidized bed system, a decomposing furnace, a rotary kiln and a grate cooler, the kiln tail of the rotary kiln is connected with the bottom of the decomposing furnace, a bottom gasified gas spraying pipe is arranged between a kiln tail smoke chamber of the cement kiln and a coal spraying pipe of the conical part, and an upper gasified gas spraying pipe is arranged on the upper portion of the middle section of the decomposing furnace; the bottom gasified gas spray pipe and the upper gasified gas spray pipe are both connected to a gasified gas outlet of the circulating fluidized bed system; and a semi-gasified gas spray pipe is arranged at the upper part of the lower section of the decomposing furnace and is connected to a semi-gasified gas outlet of the circulating fluidized bed system. The disposal amount of the alternative fuel can replace 50% of pulverized coal in the decomposing furnace, and the requirement for using the alternative fuel in a large proportion is met.

The invention relates to a two-stage combustor and an axial staged combustion chamber. The secondary combustor comprises a fuel main pipe, a fuel branch pipe, an inner cylinder and an outer cylinder; an inner airflow channel is formed between the inner cylinder and the fuel main pipe; an inner jet hole is formed in one end, close to the outlet of the inner cylinder, of the side wall of the fuel main pipe; an outer airflow channel is formed between the outer cylinder and the inner cylinder, and the outer cylinder comprises a main cylinder section and a conical cylinder section; the conical barrel section sleeves the inlet end of the inner barrel, and at least part of the conical barrel section extends into the main barrel section; the inner diameter of the conical barrel section is gradually reduced from the first end to the second end; the axial direction of the fuel branch pipe is arranged along the radial direction of the fuel main pipe, one end of the fuel branch pipe is connected to the side wall of the fuel main pipe, and the other end penetrates through the side wall of the inner cylinder and extends into the conical cylinder section; an outer jet hole is formed in the end, stretching into the conical barrel section, of the side wall of the fuel branch pipe. The secondary combustor can effectively isolate direct coupling of secondary fuel and primary flame, and avoids unstable combustion and over-high temperature caused by combustion superposition in a coupling area.

The invention relates to the technical field of sludge treatment, in particular to a low-calorific-value incineration sludge circulating fluidized bed boiler system which comprises a sludge component monitoring module, a fuel proportion adjusting module, a drying and gasifying module, a staged combustion module, a heat energy recycling and power generating module, an ash sorting module and a flue gas purifying module. Wherein the sludge component monitoring module is used for collecting organic matter content, water content and calorific value data of sludge; the fuel ratio adjusting module is used for automatically adjusting the ratio of the sludge to the auxiliary fuel; and the drying and gasifying module is used for receiving the fuel mixture and drying the fuel mixture by utilizing waste heat of the incinerator, and meanwhile, part of organic matters are converted into combustible gas through gasifying treatment. According to the invention, through intelligent fuel adjustment, waste heat recovery and multi-stage flue gas purification technologies, high-efficiency combustion, energy reutilization and up-to-standard emission of the low-calorific-value sludge are realized, and the environmental protection property and economical efficiency of sludge treatment are remarkably improved.

The invention discloses an ammonia-doped coal ignition structure, an ammonia-doped coal burner and an ammonia-doped coal ignition method. The ammonia-doped coal ignition structure comprises an ignition channel, a first-stage fuel channel, a first-stage combustion-supporting channel, a second-stage fuel channel, a second-stage combustion-supporting channel and a main combustion chamber. Fuel in the ignition channel can be ignited through the ignition electrode, primary combustion of ammonia fuel is ignited through ignition flames from the ignition nozzle, then multi-stage ignition combustion of coal doped with ammonia is achieved, ignition is easier, control is easy, the flames are more stable, and meanwhile emission of nitric oxide is greatly reduced. The coal-doped ammonia ignition structure is adopted in the coal-doped ammonia burner, and the coal-doped ammonia ignition method is suitable for the coal-doped ammonia ignition structure and the coal-doped ammonia burner.

The invention relates to the technical field of gas turbines, and particularly discloses a combustion chamber axial staged combustion lobe nozzle which comprises a lobe nozzle body, and the lobe nozzle body comprises a fuel air inlet channel, an air inlet channel, a mixing channel, a lobe structure and a mounting flange. An air inlet channel is formed in the top of the lobe nozzle, a fuel inlet channel is connected to the side face of the lobe nozzle, a mixing channel is formed in the lobe nozzle, a lobe structure is arranged in the mixing channel, and the lobe structure is used for forming a vortex system beneficial to improving mixing of air and fuel. According to the axial grading nozzle, the mixing performance of fuel and air can be improved, the nozzle outlet flame lifting and wall face cooling effects are improved, the operation load of a combustion chamber is adjusted, and therefore the effects of reducing emission of pollutants in the combustion chamber, improving the safety and reliability of the axial grading nozzle and widening the thermal load adjusting range are achieved.

The invention provides a low-pollution combustion organization method and system for a combustion chamber of a natural gas turbine. Relates to the field of combustion chamber design, and solves the problem that reliable ignition cross flame and efficient combustion cannot be realized in a small and short space under a low working condition. The method comprises a low-resistance gas distribution step, a rapid premixing step, a wide boundary concentration difference staged combustion step, a fuel escape prevention staged combustion step, a near wall surface streamline control step, a characteristic area pollutant prediction and inhibition step, an outlet temperature distribution regulation and control step and a head scaling / increasing and decreasing stage adaptation step, and determining a corresponding combustion chamber head size and a combustion chamber classification number. On the premise that the rotational flow strength is guaranteed, the flow resistance loss of the head is remarkably reduced, tempering is prevented, and the efficiency of the combustion chamber is improved.

The invention discloses a liquid fuel vaporizing and mixing multi-stage combustion system which comprises an air bellow and a fuel conveying pipe, a flow guide combined barrel is arranged in a lining barrel of the air bellow and is formed by combining an air combing flow guide barrel and a conical flow guide base up and down, and the conical flow guide base is formed by forming an included angle between an air guide annular inclined plate and a transverse bottom plate. A mixing chamber is formed between the flow guide combined cylinder and the lining cylinder, and the oil outlet end of the fuel conveying pipe is arranged in the mixing chamber; a plurality of air grooves are formed in the air combing guide cylinder, and a plurality of air guide grooves are formed in an air guide annular inclined plate of the conical guide seat; the top of the lining cylinder is connected with a combustion cylinder A in a sealed mode, the combustion cylinder A is sleeved with a porous ceramic silencing cylinder, fire distribution fins are installed on the top of the porous ceramic silencing cylinder, and a combustion cavity C is formed between the cylinder wall of the combustion cylinder A and the cylinder wall of the porous ceramic silencing cylinder. According to the invention, liquid fuel can be fully mixed, vaporized and gradually combusted, the fuel is fully combusted, and flame and heat are gathered and are subjected to fire distribution operation through the fire distribution fins.

The invention discloses a thermo-acoustic oscillation passive control axial grading combustion chamber which comprises a fuel gas distribution pipe, a head gas distribution cavity, a cooling end plate, a weak rotation micro-mixing on-duty nozzle, a direct injection micro-mixing main combustion nozzle, an axial grading nozzle, a flame tube, a flow guide bushing and an outer casing. Due to the combustion arrangement of head micro-mixing combustion and axial staged combustion, fuel gas distribution is optimized; the ignition / load-per-liter combustion stability of the combustion chamber is realized through the weak-rotation micro-mixing on-duty nozzle; the axial grading nozzle adopts a lobe structure to enhance fuel and air mixing; the cooling hole structure of the axial grading nozzle is optimized, and the effect of restraining thermo-acoustic oscillation is achieved; and the opening positions of the axial grading windward side and leeward side cooling holes are improved, so that flame lifting under the high-hydrogen-content fuel is realized. According to the axial grading combustion chamber arrangement mode, the residence time of smoke in a high-temperature area is shortened, NOx pollutant emission of the combustion chamber is reduced, and the requirement for efficient, stable and low-emission operation under the condition of high-hydrogen-content fuel is integrally met.

A hydrogen combustion-supporting liquid ammonia gas turbine combustor comprises a liquid ammonia fuel pipeline located on a center main shaft, a first-stage axial swirler and a first-stage radial swirler are coaxially arranged on the periphery of the liquid ammonia fuel pipeline, and the first-stage axial swirler and the first-stage radial swirler are the same in rotation direction and used for stabilizing liquid ammonia flames. A pre-evaporation pipe and a hydrogen collecting chamber are arranged on the periphery, a primary air channel is formed in the center space of the pre-evaporation pipe for liquid ammonia, hydrogen and air to complete premixed rotational flow, and liquid ammonia flames are stabilized. The pre-evaporated ammonia gas in the pre-evaporation pipe enters the secondary air duct, and the pre-mixed rotational flow of the ammonia gas and the air is completed through the second-stage axial swirler. A secondary air hole is formed in the wall face of the flame tube, a large amount of air enters to burn out fuel, the combustion efficiency is improved, tail gas is diluted, and NOx emission is reduced. Liquid ammonia serves as fuel, and liquid ammonia flame stabilization and NOx emission reduction are achieved through liquid ammonia fuel grading, hydrogen combustion supporting, multi-stage rotational flow premixing and staged combustion.

The invention belongs to the technical field of measurement of a flow field in a combustion chamber, and particularly discloses a low-emission gas turbine combustion chamber flow field simulation experiment test method which is used for performing experiment test on the vertical direction of the central axis of a swirler so as to obtain flow field characteristics of an outlet of the swirler and a head of the combustion chamber. According to the invention, a PIV test system is adopted to perform experimental test on the flow field of the coaxial staged combustion chamber of the engine, and at present, related research reports at home and abroad are few; and 2, carrying out numerical calculation on the flow field characteristics of the coaxial staged combustion chamber of the engine by coupling the constructed simplified natural gas chemical reaction mechanism and the CFD calculation model. The research results can provide theoretical basis and technical support for revealing the flow field characteristics in the coaxial staged combustion chamber of the natural gas turbine and optimizing the structure and performance of the combustion chamber. And thirdly, a numerical calculation method for the flow field of the engine combustion chamber is newly explored.

A main injector can include multiple sub-element mixers. A first sub-element mixer includes a first main air nozzle circumscribing a first main fuel nozzle. A second sub-element mixer includes a second main air nozzle circumscribing a second main fuel nozzle. An annular combustor can include a circumferential array of main injectors disposed proximate a pilot injector. Each main injector of the array of main injectors can be oriented with first sub-element mixers proximate to the pilot injector and second sub-element mixers spaced axially downstream relative to first sub-element mixers in a staged configuration.

The invention discloses an aero-engine acceleration control method with an interstage combustion function. In the acceleration process, the fuel flow of the main combustion chamber and the fuel flow of the interstage combustion chamber are generated through the main control loop and the additional control loop correspondingly, and then the finally-output fuel flow of the main combustion chamber and the finally-output fuel flow of the interstage combustion chamber are obtained in a low selection mode. Adjusting each variable geometry adjusting mechanism according to an acceleration adjusting plan generated by the additional control loop; the additional control loop uses the following oil supply continuing control strategy that in the acceleration process, the main combustion chamber supplies oil to accelerate firstly, after the rotating speed of a low-pressure rotor of the engine reaches a preset threshold value, the interstage combustion chamber supplies oil to ignite, and meanwhile the variable geometry adjusting mechanism is adjusted according to a pre-optimized adjusting plan. The invention further discloses an aero-engine acceleration control device with the interstage combustion function. According to the technical scheme, safe and quick response of the double-combustion-chamber acceleration process can be achieved.

The present invention discloses a coaxial staged burner for a low-pollution combustion chamber of a gas-liquid dual-fuel gas turbine, which relates to the technical field of gas turbine combustion chambers and solves the problem that existing coaxial staged burners are difficult to achieve stable combustion using a single liquid or gas fuel under any load working conditions. The coaxial staged burner comprises: a mounting flange, a main fuel sleeve and a swirler; a fuel supply interface is provided on the mounting flange; four-stage fuel sleeves are coaxially nested in the main fuel sleeve; the swirler consists of a central duty class, a first-stage premixing stage, a second-stage premixing stage, a first-stage hub and a second-stage hub; when liquid fuel works alone, the fuel enters the swirl channel through the duty class liquid fuel nozzle and the second-stage blade liquid fuel hole to achieve premixing and evaporation processes; when gas fuel works alone, the fuel enters the swirl channel through the first-stage blade fuel hole and the second-stage blade gas fuel hole to be mixed.

The invention discloses an ammonia burner based on plasma catalytic ammonia cracking and zoning regulation and control, and relates to the field of aero-engine combustion chamber structures. The head is combined with a staged combustion technology and a plasma and ammonia catalytic cracking concept, and is one of effective methods for keeping the combustion chamber to work stably, reliably and effectively with low emission. Comprising a flame tube casing serving as a burner body, a first-stage swirler, a second-stage swirler and a third-stage swirler are arranged on the front portion of the flame tube casing, an ammonia gas supply nozzle is arranged in the first-stage swirler, a metal cracker is arranged on the periphery of the ammonia gas supply nozzle, and therefore a plasma discharge area is formed between the ammonia gas supply nozzle and the metal cracker; a plurality of main combustion holes and a plurality of mixing holes are formed in the middle of the side wall of the flame tube case. The stability, ignition performance and temperature uniformity of the ammonia combustor are improved, and the ammonia combustor has the advantages of being high in ignition and flameout capacity, low in emission, reliable in structure and the like and is suitable for efficient clean combustion systems in the fields of aviation, energy and the like.

The present invention discloses a gas low-nitrogen burner and a combustion method that couples barrier wind with staged combustion. Through the three-dimensional arrangement of gas, air and barrier wind nozzles, air, gas and 20% to 25% of recycled flue gas are evenly divided into three stages as barrier wind and delivered into the furnace. The barrier wind can delay the direct contact between air and gas, so that the gas is fully mixed with the air before ignition and is evenly diluted by the barrier wind, thereby achieving uniform combustion and uniform temperature field in the space. At the same time, the barrier wind can also reduce the oxygen partial pressure, absorb the released heat, and reduce local high-temperature areas; in addition, through the three-dimensional arrangement of gas and air and the reasonable step-by-step distribution of gas and air into the furnace, the high-temperature combustion area is controlled to create a reducing atmosphere, even in the presence of NO x The present invention couples the barrier wind and staged combustion technology to reduce the NO x The emission concentration is reduced to less than 30mg / Nm 3 It is suitable for newly built or existing low-nitrogen gas boiler projects and has broad application prospects.

The invention discloses an ammonia-coal mixed combustion burner, comprising: a plasma coal powder pre-combustion stage module, an ammonia two-stage combustion module, a coal powder main combustion stage module, and an air-graded secondary air module; in the plasma coal powder pre-combustion stage module, discharge is performed between electrodes to generate plasma, coal powder carried by primary air passes through a plasma fire core region to burn and generate a first coal powder flame, the first coal powder flame ignites ammonia fuel in the upstream of the ammonia two-stage combustion module to generate a stable ammonia-rich flame, combustion products and unburned reactants are mixed with air in the downstream of the ammonia two-stage combustion module to generate an ammonia-poor flame to heat the coal powder in the coal powder main combustion stage module to generate a second coal powder flame, and in the air-graded secondary air module, the secondary air is used to promote the full combustion of coal powder and ammonia, thereby realizing the stable combustion of the ammonia-coal mixed fuel, and effectively solving the problems of unstable combustion of ammonia coal and NO x Problems with excessive emissions and ammonia slip.

A gas turbine engine includes a staged combustion system having pilot fuel injectors and main fuel injectors. A fuel delivery regulator controls delivery of fuel to the pilot and main fuel injectors, receives fuel from a first fuel source containing a first fuel having a first fuel characteristic and a second fuel source containing a second fuel having a second fuel characteristic. In a transition range of operation between the pilot-only and the pilot-and-main ranges of operation, fuel is delivered to both the pilot and main fuel injectors at a transition staging ratio different from the pilot-and-main staging ratio. The fuel delivery regulator delivers fuel to one or both the pilot and main fuel injectors during the transition range of operation having a different fuel characteristic from fuel delivered to one or both the pilot and main fuel injectors during at least part of the pilot-and-main range of operation.

The invention provides a flue gas recirculation and staged combustion coupled low-nitrogen gas burner, and belongs to the field of gas burners. The problem that an existing combustor cannot control emission of nitric oxide and has stable combustion performance is solved. Wherein the outlet end of the air channel penetrates through the air sleeve, and the inlet end of the on-duty sleeve penetrates through the air sleeve; the first rotational flow blade is arranged on the air sleeve; the second swirl vane is arranged on the on-duty sleeve; the on-duty flame gas pipe sequentially penetrates through the air channel, the air sleeve and the on-duty sleeve, and the outlet end of the on-duty flame gas pipe is provided with a jet hole group; the outlet end of the outer ring main flame gas pipe penetrates through the outer ring mixing pipe; the multiple outer ring fuel gas and flue gas mixing ejectors are arranged at intervals in the circumferential direction of the air sleeve; the outlet end of the inner-ring main flame gas pipe penetrates through the inner-ring mixing pipe; and the multiple inner ring fuel gas and flue gas mixing ejectors are arranged at intervals in the circumferential direction of the air sleeve. And nitrogen oxide emission can be controlled, and stable combustion is guaranteed.

The invention discloses a combined air inlet two-stage combustion six-stroke engine, and relates to the field of power energy. In order to overcome the defects that in the prior art, a six-stroke engine is insufficient in gas inlet in the secondary combustion stage, poor in oil-gas mixing quality and low in combustion efficiency, according to the technical scheme, the six-stroke engine comprises a combustion chamber assembly, a fuel injector, a transmission mechanism and a gas distribution mechanism; the gas distribution mechanism comprises a gas inlet pipeline, an exhaust pipeline, a gas storage cavity, a gas inlet pipeline valve, a scavenging duct and a scavenging duct one-way valve, the working cycle of the engine comprises two times of gas inlet and two times of oil injection combustion acting, and the gas storage cavity releases gas to supplement fresh air in the combustion chamber in the second time of gas inlet. The combustion chamber assembly comprises a cylinder, a piston and a cylinder cover, the piston reciprocates in the cylinder, and the cylinder and the cylinder cover are closed to form a combustion chamber. The invention is suitable for improving the heat efficiency and output performance of the engine, especially for an internal combustion engine power system requiring multiple combustion work.

An alternative fuel vertical pre-combustion furnace comprises a vertical combustion chamber furnace body, a multi-stage stepped furnace hearth arranged on the side wall of the pre-combustion furnace body and a pneumatic pulse injection device arranged on the furnace hearth, and castable is arranged on the inner wall of the whole furnace body. Light flammable substances are completely incinerated under the driving of high-speed airflow, heavier flame-retardant substances fall into the next step to be continuously incinerated, the burn-off rate of the alternative fuel is greatly improved after the alternative fuel stays, is scattered and is pre-combusted, and completely-combusted material residues are dispersed by strong injection of compressed air of an air cannon system; therefore, the influence on the cement kiln caused by sedimentation of the material slag agglomerated in the decomposing furnace is solved. And materials on the uppermost combustion platform sequentially slide to the second-stage combustion step platform and then slide to the next-stage combustion platform layer by layer, and the process is repeated. And waste gas and ash after incineration are discharged from the bottom of the pre-combustion furnace and enter a kiln tail decomposing furnace system, when the material slag is harmful to the kiln system, the material slag can be discharged, and high-temperature airflow enters the decomposing furnace.

The invention discloses a low-nitrogen gas burner suitable for various working conditions and a using method of the low-nitrogen gas burner. The low-nitrogen gas burner comprises an assembly cylinder, an outer-layer fire pan, a central fire pan, an inner-layer gas gun, an outer-layer gas gun and an oxygen gun. The height of the center fire pan is adjusted through the lifting assembly, and switching of three modes of air combustion supporting, oxygen-enriched combustion supporting and pure oxygen combustion supporting is achieved. The air adjusting assembly controls the combustion-supporting air flow; the flow comprehensive adjusting assembly adjusts fuel gas supply and oxygen supply in a linkage mode. The combustor adopts a staged combustion design, the inner-layer gas gun forms first-stage flame at a fire pan gap, the outer-layer gas gun and a combustion-supporting medium ejected from the central fire pan form second-stage combustion, and the temperature of the flame is reduced by ejecting hearth smoke. Cooperative control over all the executing mechanisms is achieved through the driving motor and the speed setting assembly, the beneficial effects that combustion modes are automatically switched, the flame temperature is accurately regulated and controlled, and emission of oxynitride is low are achieved, and the clean combustion requirements of different industrial furnaces can be met.

The invention discloses a multi-angle micro-pipe staged combustion rotational flow gas burner, and relates to the technical field of industrial burners and low-nitrogen combustion. According to the low-nitrogen combustor, the problem that the combustion stability and the nitrogen oxide emission control level are difficult to optimize at the same time due to the fact that an existing low-nitrogen combustor cannot achieve fuel uniform distribution on the microscale is solved. The device comprises an on-duty flame system, a main flame system, an air supply channel and a flue gas recirculation structure, the on-duty flame system realizes multi-angle uniform injection of fuel through a multi-angle fuel distribution device to form stable central on-duty flame; the main flame system realizes fuel grading through an inner and outer ring mixing pipe; the flue gas recirculation structure introduces backflow flue gas into the combustion area through the flaring of the mixing pipe and the entrainment opening of the arc-shaped air sleeve, the backflow flue gas is mixed with air or fuel gas, and the combustion temperature and the oxygen concentration are effectively reduced. Through the synergistic effect of staged combustion and flue gas recirculation, the effects of stable combustion, uniform flame and low NOx emission are achieved.

The invention discloses a control method of a combustion system and the combustion system, and belongs to the technical field of combustion control. The control method of the combustion system comprises the steps that fuel gas is controlled to be input into the first-stage combustion module, so that the fuel gas and air in the first-stage combustion module are subjected to mixed combustion, and gas which is not fully combusted enters the second-stage combustion module through flow guide fins; and gas is controlled to be input into the second-stage combustion module, so that the gas is mixed with gas which is not fully combusted in the second-stage combustion module and air in the second-stage combustion module for combustion. According to the control method of the combustion system, the emission amount of harmful gas is reduced, and the combustion heat efficiency of the system is improved.